This is useful when connecting through proxyjump in combination with GSSAPITrustDNS yes, because we can not get remote address of such socket. https://src.fedoraproject.org/rpms/openssh/blob/f29/f/openssh-6.1p1-gssapi-canohost.patch
3931 lines
121 KiB
Diff
3931 lines
121 KiB
Diff
diff --git a/Makefile.in b/Makefile.in
|
|
index e7549470..b68c1710 100644
|
|
--- a/Makefile.in
|
|
+++ b/Makefile.in
|
|
@@ -109,6 +109,7 @@ LIBSSH_OBJS=${LIBOPENSSH_OBJS} \
|
|
kex.o kexdh.o kexgex.o kexecdh.o kexc25519.o \
|
|
kexgexc.o kexgexs.o \
|
|
sntrup4591761.o kexsntrup4591761x25519.o kexgen.o \
|
|
+ kexgssc.o \
|
|
sftp-realpath.o platform-pledge.o platform-tracing.o platform-misc.o \
|
|
sshbuf-io.o
|
|
|
|
@@ -125,7 +126,7 @@ SSHDOBJS=sshd.o auth-rhosts.o auth-passwd.o \
|
|
auth-bsdauth.o auth2-hostbased.o auth2-kbdint.o \
|
|
auth2-none.o auth2-passwd.o auth2-pubkey.o \
|
|
monitor.o monitor_wrap.o auth-krb5.o \
|
|
- auth2-gss.o gss-serv.o gss-serv-krb5.o \
|
|
+ auth2-gss.o gss-serv.o gss-serv-krb5.o kexgsss.o \
|
|
loginrec.o auth-pam.o auth-shadow.o auth-sia.o md5crypt.o \
|
|
sftp-server.o sftp-common.o \
|
|
sandbox-null.o sandbox-rlimit.o sandbox-systrace.o sandbox-darwin.o \
|
|
diff --git a/auth.c b/auth.c
|
|
index 086b8ebb..687c57b4 100644
|
|
--- a/auth.c
|
|
+++ b/auth.c
|
|
@@ -400,7 +400,8 @@ auth_root_allowed(struct ssh *ssh, const char *method)
|
|
case PERMIT_NO_PASSWD:
|
|
if (strcmp(method, "publickey") == 0 ||
|
|
strcmp(method, "hostbased") == 0 ||
|
|
- strcmp(method, "gssapi-with-mic") == 0)
|
|
+ strcmp(method, "gssapi-with-mic") == 0 ||
|
|
+ strcmp(method, "gssapi-keyex") == 0)
|
|
return 1;
|
|
break;
|
|
case PERMIT_FORCED_ONLY:
|
|
@@ -724,99 +725,6 @@ fakepw(void)
|
|
return (&fake);
|
|
}
|
|
|
|
-/*
|
|
- * Returns the remote DNS hostname as a string. The returned string must not
|
|
- * be freed. NB. this will usually trigger a DNS query the first time it is
|
|
- * called.
|
|
- * This function does additional checks on the hostname to mitigate some
|
|
- * attacks on legacy rhosts-style authentication.
|
|
- * XXX is RhostsRSAAuthentication vulnerable to these?
|
|
- * XXX Can we remove these checks? (or if not, remove RhostsRSAAuthentication?)
|
|
- */
|
|
-
|
|
-static char *
|
|
-remote_hostname(struct ssh *ssh)
|
|
-{
|
|
- struct sockaddr_storage from;
|
|
- socklen_t fromlen;
|
|
- struct addrinfo hints, *ai, *aitop;
|
|
- char name[NI_MAXHOST], ntop2[NI_MAXHOST];
|
|
- const char *ntop = ssh_remote_ipaddr(ssh);
|
|
-
|
|
- /* Get IP address of client. */
|
|
- fromlen = sizeof(from);
|
|
- memset(&from, 0, sizeof(from));
|
|
- if (getpeername(ssh_packet_get_connection_in(ssh),
|
|
- (struct sockaddr *)&from, &fromlen) == -1) {
|
|
- debug("getpeername failed: %.100s", strerror(errno));
|
|
- return xstrdup(ntop);
|
|
- }
|
|
-
|
|
- ipv64_normalise_mapped(&from, &fromlen);
|
|
- if (from.ss_family == AF_INET6)
|
|
- fromlen = sizeof(struct sockaddr_in6);
|
|
-
|
|
- debug3("Trying to reverse map address %.100s.", ntop);
|
|
- /* Map the IP address to a host name. */
|
|
- if (getnameinfo((struct sockaddr *)&from, fromlen, name, sizeof(name),
|
|
- NULL, 0, NI_NAMEREQD) != 0) {
|
|
- /* Host name not found. Use ip address. */
|
|
- return xstrdup(ntop);
|
|
- }
|
|
-
|
|
- /*
|
|
- * if reverse lookup result looks like a numeric hostname,
|
|
- * someone is trying to trick us by PTR record like following:
|
|
- * 1.1.1.10.in-addr.arpa. IN PTR 2.3.4.5
|
|
- */
|
|
- memset(&hints, 0, sizeof(hints));
|
|
- hints.ai_socktype = SOCK_DGRAM; /*dummy*/
|
|
- hints.ai_flags = AI_NUMERICHOST;
|
|
- if (getaddrinfo(name, NULL, &hints, &ai) == 0) {
|
|
- logit("Nasty PTR record \"%s\" is set up for %s, ignoring",
|
|
- name, ntop);
|
|
- freeaddrinfo(ai);
|
|
- return xstrdup(ntop);
|
|
- }
|
|
-
|
|
- /* Names are stored in lowercase. */
|
|
- lowercase(name);
|
|
-
|
|
- /*
|
|
- * Map it back to an IP address and check that the given
|
|
- * address actually is an address of this host. This is
|
|
- * necessary because anyone with access to a name server can
|
|
- * define arbitrary names for an IP address. Mapping from
|
|
- * name to IP address can be trusted better (but can still be
|
|
- * fooled if the intruder has access to the name server of
|
|
- * the domain).
|
|
- */
|
|
- memset(&hints, 0, sizeof(hints));
|
|
- hints.ai_family = from.ss_family;
|
|
- hints.ai_socktype = SOCK_STREAM;
|
|
- if (getaddrinfo(name, NULL, &hints, &aitop) != 0) {
|
|
- logit("reverse mapping checking getaddrinfo for %.700s "
|
|
- "[%s] failed.", name, ntop);
|
|
- return xstrdup(ntop);
|
|
- }
|
|
- /* Look for the address from the list of addresses. */
|
|
- for (ai = aitop; ai; ai = ai->ai_next) {
|
|
- if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop2,
|
|
- sizeof(ntop2), NULL, 0, NI_NUMERICHOST) == 0 &&
|
|
- (strcmp(ntop, ntop2) == 0))
|
|
- break;
|
|
- }
|
|
- freeaddrinfo(aitop);
|
|
- /* If we reached the end of the list, the address was not there. */
|
|
- if (ai == NULL) {
|
|
- /* Address not found for the host name. */
|
|
- logit("Address %.100s maps to %.600s, but this does not "
|
|
- "map back to the address.", ntop, name);
|
|
- return xstrdup(ntop);
|
|
- }
|
|
- return xstrdup(name);
|
|
-}
|
|
-
|
|
/*
|
|
* Return the canonical name of the host in the other side of the current
|
|
* connection. The host name is cached, so it is efficient to call this
|
|
diff --git a/auth2-gss.c b/auth2-gss.c
|
|
index 9351e042..d6446c0c 100644
|
|
--- a/auth2-gss.c
|
|
+++ b/auth2-gss.c
|
|
@@ -1,7 +1,7 @@
|
|
/* $OpenBSD: auth2-gss.c,v 1.29 2018/07/31 03:10:27 djm Exp $ */
|
|
|
|
/*
|
|
- * Copyright (c) 2001-2003 Simon Wilkinson. All rights reserved.
|
|
+ * Copyright (c) 2001-2007 Simon Wilkinson. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
@@ -54,6 +54,48 @@ static int input_gssapi_mic(int type, u_int32_t plen, struct ssh *ssh);
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|
static int input_gssapi_exchange_complete(int type, u_int32_t plen, struct ssh *ssh);
|
|
static int input_gssapi_errtok(int, u_int32_t, struct ssh *);
|
|
|
|
+/*
|
|
+ * The 'gssapi_keyex' userauth mechanism.
|
|
+ */
|
|
+static int
|
|
+userauth_gsskeyex(struct ssh *ssh)
|
|
+{
|
|
+ Authctxt *authctxt = ssh->authctxt;
|
|
+ int r, authenticated = 0;
|
|
+ struct sshbuf *b = NULL;
|
|
+ gss_buffer_desc mic, gssbuf;
|
|
+ u_char *p;
|
|
+ size_t len;
|
|
+
|
|
+ if ((r = sshpkt_get_string(ssh, &p, &len)) != 0 ||
|
|
+ (r = sshpkt_get_end(ssh)) != 0)
|
|
+ fatal("%s: %s", __func__, ssh_err(r));
|
|
+
|
|
+ if ((b = sshbuf_new()) == NULL)
|
|
+ fatal("%s: sshbuf_new failed", __func__);
|
|
+
|
|
+ mic.value = p;
|
|
+ mic.length = len;
|
|
+
|
|
+ ssh_gssapi_buildmic(b, authctxt->user, authctxt->service,
|
|
+ "gssapi-keyex");
|
|
+
|
|
+ if ((gssbuf.value = sshbuf_mutable_ptr(b)) == NULL)
|
|
+ fatal("%s: sshbuf_mutable_ptr failed", __func__);
|
|
+ gssbuf.length = sshbuf_len(b);
|
|
+
|
|
+ /* gss_kex_context is NULL with privsep, so we can't check it here */
|
|
+ if (!GSS_ERROR(PRIVSEP(ssh_gssapi_checkmic(gss_kex_context,
|
|
+ &gssbuf, &mic))))
|
|
+ authenticated = PRIVSEP(ssh_gssapi_userok(authctxt->user,
|
|
+ authctxt->pw, 1));
|
|
+
|
|
+ sshbuf_free(b);
|
|
+ free(mic.value);
|
|
+
|
|
+ return (authenticated);
|
|
+}
|
|
+
|
|
/*
|
|
* We only support those mechanisms that we know about (ie ones that we know
|
|
* how to check local user kuserok and the like)
|
|
@@ -260,7 +302,8 @@ input_gssapi_exchange_complete(int type, u_int32_t plen, struct ssh *ssh)
|
|
if ((r = sshpkt_get_end(ssh)) != 0)
|
|
fatal("%s: %s", __func__, ssh_err(r));
|
|
|
|
- authenticated = PRIVSEP(ssh_gssapi_userok(authctxt->user));
|
|
+ authenticated = PRIVSEP(ssh_gssapi_userok(authctxt->user,
|
|
+ authctxt->pw, 1));
|
|
|
|
if ((!use_privsep || mm_is_monitor()) &&
|
|
(displayname = ssh_gssapi_displayname()) != NULL)
|
|
@@ -306,7 +349,8 @@ input_gssapi_mic(int type, u_int32_t plen, struct ssh *ssh)
|
|
gssbuf.length = sshbuf_len(b);
|
|
|
|
if (!GSS_ERROR(PRIVSEP(ssh_gssapi_checkmic(gssctxt, &gssbuf, &mic))))
|
|
- authenticated = PRIVSEP(ssh_gssapi_userok(authctxt->user));
|
|
+ authenticated = PRIVSEP(ssh_gssapi_userok(authctxt->user,
|
|
+ authctxt->pw, 0));
|
|
else
|
|
logit("GSSAPI MIC check failed");
|
|
|
|
@@ -326,6 +370,12 @@ input_gssapi_mic(int type, u_int32_t plen, struct ssh *ssh)
|
|
return 0;
|
|
}
|
|
|
|
+Authmethod method_gsskeyex = {
|
|
+ "gssapi-keyex",
|
|
+ userauth_gsskeyex,
|
|
+ &options.gss_authentication
|
|
+};
|
|
+
|
|
Authmethod method_gssapi = {
|
|
"gssapi-with-mic",
|
|
userauth_gssapi,
|
|
diff --git a/auth2.c b/auth2.c
|
|
index 0e776224..1c217268 100644
|
|
--- a/auth2.c
|
|
+++ b/auth2.c
|
|
@@ -73,6 +73,7 @@ extern Authmethod method_passwd;
|
|
extern Authmethod method_kbdint;
|
|
extern Authmethod method_hostbased;
|
|
#ifdef GSSAPI
|
|
+extern Authmethod method_gsskeyex;
|
|
extern Authmethod method_gssapi;
|
|
#endif
|
|
|
|
@@ -80,6 +81,7 @@ Authmethod *authmethods[] = {
|
|
&method_none,
|
|
&method_pubkey,
|
|
#ifdef GSSAPI
|
|
+ &method_gsskeyex,
|
|
&method_gssapi,
|
|
#endif
|
|
&method_passwd,
|
|
diff --git a/canohost.c b/canohost.c
|
|
index abea9c6e..8e81b519 100644
|
|
--- a/canohost.c
|
|
+++ b/canohost.c
|
|
@@ -35,6 +35,99 @@
|
|
#include "canohost.h"
|
|
#include "misc.h"
|
|
|
|
+/*
|
|
+ * Returns the remote DNS hostname as a string. The returned string must not
|
|
+ * be freed. NB. this will usually trigger a DNS query the first time it is
|
|
+ * called.
|
|
+ * This function does additional checks on the hostname to mitigate some
|
|
+ * attacks on legacy rhosts-style authentication.
|
|
+ * XXX is RhostsRSAAuthentication vulnerable to these?
|
|
+ * XXX Can we remove these checks? (or if not, remove RhostsRSAAuthentication?)
|
|
+ */
|
|
+
|
|
+char *
|
|
+remote_hostname(struct ssh *ssh)
|
|
+{
|
|
+ struct sockaddr_storage from;
|
|
+ socklen_t fromlen;
|
|
+ struct addrinfo hints, *ai, *aitop;
|
|
+ char name[NI_MAXHOST], ntop2[NI_MAXHOST];
|
|
+ const char *ntop = ssh_remote_ipaddr(ssh);
|
|
+
|
|
+ /* Get IP address of client. */
|
|
+ fromlen = sizeof(from);
|
|
+ memset(&from, 0, sizeof(from));
|
|
+ if (getpeername(ssh_packet_get_connection_in(ssh),
|
|
+ (struct sockaddr *)&from, &fromlen) == -1) {
|
|
+ debug("getpeername failed: %.100s", strerror(errno));
|
|
+ return xstrdup(ntop);
|
|
+ }
|
|
+
|
|
+ ipv64_normalise_mapped(&from, &fromlen);
|
|
+ if (from.ss_family == AF_INET6)
|
|
+ fromlen = sizeof(struct sockaddr_in6);
|
|
+
|
|
+ debug3("Trying to reverse map address %.100s.", ntop);
|
|
+ /* Map the IP address to a host name. */
|
|
+ if (getnameinfo((struct sockaddr *)&from, fromlen, name, sizeof(name),
|
|
+ NULL, 0, NI_NAMEREQD) != 0) {
|
|
+ /* Host name not found. Use ip address. */
|
|
+ return xstrdup(ntop);
|
|
+ }
|
|
+
|
|
+ /*
|
|
+ * if reverse lookup result looks like a numeric hostname,
|
|
+ * someone is trying to trick us by PTR record like following:
|
|
+ * 1.1.1.10.in-addr.arpa. IN PTR 2.3.4.5
|
|
+ */
|
|
+ memset(&hints, 0, sizeof(hints));
|
|
+ hints.ai_socktype = SOCK_DGRAM; /*dummy*/
|
|
+ hints.ai_flags = AI_NUMERICHOST;
|
|
+ if (getaddrinfo(name, NULL, &hints, &ai) == 0) {
|
|
+ logit("Nasty PTR record \"%s\" is set up for %s, ignoring",
|
|
+ name, ntop);
|
|
+ freeaddrinfo(ai);
|
|
+ return xstrdup(ntop);
|
|
+ }
|
|
+
|
|
+ /* Names are stored in lowercase. */
|
|
+ lowercase(name);
|
|
+
|
|
+ /*
|
|
+ * Map it back to an IP address and check that the given
|
|
+ * address actually is an address of this host. This is
|
|
+ * necessary because anyone with access to a name server can
|
|
+ * define arbitrary names for an IP address. Mapping from
|
|
+ * name to IP address can be trusted better (but can still be
|
|
+ * fooled if the intruder has access to the name server of
|
|
+ * the domain).
|
|
+ */
|
|
+ memset(&hints, 0, sizeof(hints));
|
|
+ hints.ai_family = from.ss_family;
|
|
+ hints.ai_socktype = SOCK_STREAM;
|
|
+ if (getaddrinfo(name, NULL, &hints, &aitop) != 0) {
|
|
+ logit("reverse mapping checking getaddrinfo for %.700s "
|
|
+ "[%s] failed.", name, ntop);
|
|
+ return xstrdup(ntop);
|
|
+ }
|
|
+ /* Look for the address from the list of addresses. */
|
|
+ for (ai = aitop; ai; ai = ai->ai_next) {
|
|
+ if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop2,
|
|
+ sizeof(ntop2), NULL, 0, NI_NUMERICHOST) == 0 &&
|
|
+ (strcmp(ntop, ntop2) == 0))
|
|
+ break;
|
|
+ }
|
|
+ freeaddrinfo(aitop);
|
|
+ /* If we reached the end of the list, the address was not there. */
|
|
+ if (ai == NULL) {
|
|
+ /* Address not found for the host name. */
|
|
+ logit("Address %.100s maps to %.600s, but this does not "
|
|
+ "map back to the address.", ntop, name);
|
|
+ return xstrdup(ntop);
|
|
+ }
|
|
+ return xstrdup(name);
|
|
+}
|
|
+
|
|
void
|
|
ipv64_normalise_mapped(struct sockaddr_storage *addr, socklen_t *len)
|
|
{
|
|
diff --git a/canohost.h b/canohost.h
|
|
index 26d62855..0cadc9f1 100644
|
|
--- a/canohost.h
|
|
+++ b/canohost.h
|
|
@@ -15,6 +15,9 @@
|
|
#ifndef _CANOHOST_H
|
|
#define _CANOHOST_H
|
|
|
|
+struct ssh;
|
|
+
|
|
+char *remote_hostname(struct ssh *);
|
|
char *get_peer_ipaddr(int);
|
|
int get_peer_port(int);
|
|
char *get_local_ipaddr(int);
|
|
diff --git a/clientloop.c b/clientloop.c
|
|
index ebd0dbca..1bdac6a4 100644
|
|
--- a/clientloop.c
|
|
+++ b/clientloop.c
|
|
@@ -112,6 +112,10 @@
|
|
#include "ssherr.h"
|
|
#include "hostfile.h"
|
|
|
|
+#ifdef GSSAPI
|
|
+#include "ssh-gss.h"
|
|
+#endif
|
|
+
|
|
/* import options */
|
|
extern Options options;
|
|
|
|
@@ -1379,9 +1383,18 @@ client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
|
|
break;
|
|
|
|
/* Do channel operations unless rekeying in progress. */
|
|
- if (!ssh_packet_is_rekeying(ssh))
|
|
+ if (!ssh_packet_is_rekeying(ssh)) {
|
|
channel_after_select(ssh, readset, writeset);
|
|
|
|
+#ifdef GSSAPI
|
|
+ if (options.gss_renewal_rekey &&
|
|
+ ssh_gssapi_credentials_updated(NULL)) {
|
|
+ debug("credentials updated - forcing rekey");
|
|
+ need_rekeying = 1;
|
|
+ }
|
|
+#endif
|
|
+ }
|
|
+
|
|
/* Buffer input from the connection. */
|
|
client_process_net_input(ssh, readset);
|
|
|
|
diff --git a/configure.ac b/configure.ac
|
|
index b689db4b..efafb6bd 100644
|
|
--- a/configure.ac
|
|
+++ b/configure.ac
|
|
@@ -674,6 +674,30 @@ main() { if (NSVersionOfRunTimeLibrary("System") >= (60 << 16))
|
|
[Use tunnel device compatibility to OpenBSD])
|
|
AC_DEFINE([SSH_TUN_PREPEND_AF], [1],
|
|
[Prepend the address family to IP tunnel traffic])
|
|
+ AC_MSG_CHECKING([if we have the Security Authorization Session API])
|
|
+ AC_TRY_COMPILE([#include <Security/AuthSession.h>],
|
|
+ [SessionCreate(0, 0);],
|
|
+ [ac_cv_use_security_session_api="yes"
|
|
+ AC_DEFINE([USE_SECURITY_SESSION_API], [1],
|
|
+ [platform has the Security Authorization Session API])
|
|
+ LIBS="$LIBS -framework Security"
|
|
+ AC_MSG_RESULT([yes])],
|
|
+ [ac_cv_use_security_session_api="no"
|
|
+ AC_MSG_RESULT([no])])
|
|
+ AC_MSG_CHECKING([if we have an in-memory credentials cache])
|
|
+ AC_TRY_COMPILE(
|
|
+ [#include <Kerberos/Kerberos.h>],
|
|
+ [cc_context_t c;
|
|
+ (void) cc_initialize (&c, 0, NULL, NULL);],
|
|
+ [AC_DEFINE([USE_CCAPI], [1],
|
|
+ [platform uses an in-memory credentials cache])
|
|
+ LIBS="$LIBS -framework Security"
|
|
+ AC_MSG_RESULT([yes])
|
|
+ if test "x$ac_cv_use_security_session_api" = "xno"; then
|
|
+ AC_MSG_ERROR([*** Need a security framework to use the credentials cache API ***])
|
|
+ fi],
|
|
+ [AC_MSG_RESULT([no])]
|
|
+ )
|
|
m4_pattern_allow([AU_IPv])
|
|
AC_CHECK_DECL([AU_IPv4], [],
|
|
AC_DEFINE([AU_IPv4], [0], [System only supports IPv4 audit records])
|
|
diff --git a/gss-genr.c b/gss-genr.c
|
|
index d56257b4..763a63ff 100644
|
|
--- a/gss-genr.c
|
|
+++ b/gss-genr.c
|
|
@@ -1,7 +1,7 @@
|
|
/* $OpenBSD: gss-genr.c,v 1.26 2018/07/10 09:13:30 djm Exp $ */
|
|
|
|
/*
|
|
- * Copyright (c) 2001-2007 Simon Wilkinson. All rights reserved.
|
|
+ * Copyright (c) 2001-2009 Simon Wilkinson. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
@@ -41,12 +41,36 @@
|
|
#include "sshbuf.h"
|
|
#include "log.h"
|
|
#include "ssh2.h"
|
|
+#include "cipher.h"
|
|
+#include "sshkey.h"
|
|
+#include "kex.h"
|
|
+#include "digest.h"
|
|
+#include "packet.h"
|
|
|
|
#include "ssh-gss.h"
|
|
|
|
extern u_char *session_id2;
|
|
extern u_int session_id2_len;
|
|
|
|
+typedef struct {
|
|
+ char *encoded;
|
|
+ gss_OID oid;
|
|
+} ssh_gss_kex_mapping;
|
|
+
|
|
+/*
|
|
+ * XXX - It would be nice to find a more elegant way of handling the
|
|
+ * XXX passing of the key exchange context to the userauth routines
|
|
+ */
|
|
+
|
|
+Gssctxt *gss_kex_context = NULL;
|
|
+
|
|
+static ssh_gss_kex_mapping *gss_enc2oid = NULL;
|
|
+
|
|
+int
|
|
+ssh_gssapi_oid_table_ok(void) {
|
|
+ return (gss_enc2oid != NULL);
|
|
+}
|
|
+
|
|
/* sshbuf_get for gss_buffer_desc */
|
|
int
|
|
ssh_gssapi_get_buffer_desc(struct sshbuf *b, gss_buffer_desc *g)
|
|
@@ -62,6 +86,162 @@ ssh_gssapi_get_buffer_desc(struct sshbuf *b, gss_buffer_desc *g)
|
|
return 0;
|
|
}
|
|
|
|
+/* sshpkt_get of gss_buffer_desc */
|
|
+int
|
|
+ssh_gssapi_sshpkt_get_buffer_desc(struct ssh *ssh, gss_buffer_desc *g)
|
|
+{
|
|
+ int r;
|
|
+ u_char *p;
|
|
+ size_t len;
|
|
+
|
|
+ if ((r = sshpkt_get_string(ssh, &p, &len)) != 0)
|
|
+ return r;
|
|
+ g->value = p;
|
|
+ g->length = len;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/*
|
|
+ * Return a list of the gss-group1-sha1 mechanisms supported by this program
|
|
+ *
|
|
+ * We test mechanisms to ensure that we can use them, to avoid starting
|
|
+ * a key exchange with a bad mechanism
|
|
+ */
|
|
+
|
|
+char *
|
|
+ssh_gssapi_client_mechanisms(const char *host, const char *client,
|
|
+ const char *kex) {
|
|
+ gss_OID_set gss_supported = NULL;
|
|
+ OM_uint32 min_status;
|
|
+
|
|
+ if (GSS_ERROR(gss_indicate_mechs(&min_status, &gss_supported)))
|
|
+ return NULL;
|
|
+
|
|
+ return ssh_gssapi_kex_mechs(gss_supported, ssh_gssapi_check_mechanism,
|
|
+ host, client, kex);
|
|
+}
|
|
+
|
|
+char *
|
|
+ssh_gssapi_kex_mechs(gss_OID_set gss_supported, ssh_gssapi_check_fn *check,
|
|
+ const char *host, const char *client, const char *kex) {
|
|
+ struct sshbuf *buf = NULL;
|
|
+ size_t i;
|
|
+ int r = SSH_ERR_ALLOC_FAIL;
|
|
+ int oidpos, enclen;
|
|
+ char *mechs, *encoded;
|
|
+ u_char digest[SSH_DIGEST_MAX_LENGTH];
|
|
+ char deroid[2];
|
|
+ struct ssh_digest_ctx *md = NULL;
|
|
+ char *s, *cp, *p;
|
|
+
|
|
+ if (gss_enc2oid != NULL) {
|
|
+ for (i = 0; gss_enc2oid[i].encoded != NULL; i++)
|
|
+ free(gss_enc2oid[i].encoded);
|
|
+ free(gss_enc2oid);
|
|
+ }
|
|
+
|
|
+ gss_enc2oid = xmalloc(sizeof(ssh_gss_kex_mapping) *
|
|
+ (gss_supported->count + 1));
|
|
+
|
|
+ if ((buf = sshbuf_new()) == NULL)
|
|
+ fatal("%s: sshbuf_new failed", __func__);
|
|
+
|
|
+ oidpos = 0;
|
|
+ s = cp = xstrdup(kex);
|
|
+ for (i = 0; i < gss_supported->count; i++) {
|
|
+ if (gss_supported->elements[i].length < 128 &&
|
|
+ (*check)(NULL, &(gss_supported->elements[i]), host, client)) {
|
|
+
|
|
+ deroid[0] = SSH_GSS_OIDTYPE;
|
|
+ deroid[1] = gss_supported->elements[i].length;
|
|
+
|
|
+ if ((md = ssh_digest_start(SSH_DIGEST_MD5)) == NULL ||
|
|
+ (r = ssh_digest_update(md, deroid, 2)) != 0 ||
|
|
+ (r = ssh_digest_update(md,
|
|
+ gss_supported->elements[i].elements,
|
|
+ gss_supported->elements[i].length)) != 0 ||
|
|
+ (r = ssh_digest_final(md, digest, sizeof(digest))) != 0)
|
|
+ fatal("%s: digest failed: %s", __func__,
|
|
+ ssh_err(r));
|
|
+ ssh_digest_free(md);
|
|
+ md = NULL;
|
|
+
|
|
+ encoded = xmalloc(ssh_digest_bytes(SSH_DIGEST_MD5)
|
|
+ * 2);
|
|
+ enclen = __b64_ntop(digest,
|
|
+ ssh_digest_bytes(SSH_DIGEST_MD5), encoded,
|
|
+ ssh_digest_bytes(SSH_DIGEST_MD5) * 2);
|
|
+
|
|
+ cp = strncpy(s, kex, strlen(kex));
|
|
+ for ((p = strsep(&cp, ",")); p && *p != '\0';
|
|
+ (p = strsep(&cp, ","))) {
|
|
+ if (sshbuf_len(buf) != 0 &&
|
|
+ (r = sshbuf_put_u8(buf, ',')) != 0)
|
|
+ fatal("%s: sshbuf_put_u8 error: %s",
|
|
+ __func__, ssh_err(r));
|
|
+ if ((r = sshbuf_put(buf, p, strlen(p))) != 0 ||
|
|
+ (r = sshbuf_put(buf, encoded, enclen)) != 0)
|
|
+ fatal("%s: sshbuf_put error: %s",
|
|
+ __func__, ssh_err(r));
|
|
+ }
|
|
+
|
|
+ gss_enc2oid[oidpos].oid = &(gss_supported->elements[i]);
|
|
+ gss_enc2oid[oidpos].encoded = encoded;
|
|
+ oidpos++;
|
|
+ }
|
|
+ }
|
|
+ free(s);
|
|
+ gss_enc2oid[oidpos].oid = NULL;
|
|
+ gss_enc2oid[oidpos].encoded = NULL;
|
|
+
|
|
+ if ((mechs = sshbuf_dup_string(buf)) == NULL)
|
|
+ fatal("%s: sshbuf_dup_string failed", __func__);
|
|
+
|
|
+ sshbuf_free(buf);
|
|
+
|
|
+ if (strlen(mechs) == 0) {
|
|
+ free(mechs);
|
|
+ mechs = NULL;
|
|
+ }
|
|
+
|
|
+ return (mechs);
|
|
+}
|
|
+
|
|
+gss_OID
|
|
+ssh_gssapi_id_kex(Gssctxt *ctx, char *name, int kex_type) {
|
|
+ int i = 0;
|
|
+
|
|
+#define SKIP_KEX_NAME(type) \
|
|
+ case type: \
|
|
+ if (strlen(name) < sizeof(type##_ID)) \
|
|
+ return GSS_C_NO_OID; \
|
|
+ name += sizeof(type##_ID) - 1; \
|
|
+ break;
|
|
+
|
|
+ switch (kex_type) {
|
|
+ SKIP_KEX_NAME(KEX_GSS_GRP1_SHA1)
|
|
+ SKIP_KEX_NAME(KEX_GSS_GRP14_SHA1)
|
|
+ SKIP_KEX_NAME(KEX_GSS_GRP14_SHA256)
|
|
+ SKIP_KEX_NAME(KEX_GSS_GRP16_SHA512)
|
|
+ SKIP_KEX_NAME(KEX_GSS_GEX_SHA1)
|
|
+ SKIP_KEX_NAME(KEX_GSS_NISTP256_SHA256)
|
|
+ SKIP_KEX_NAME(KEX_GSS_C25519_SHA256)
|
|
+ default:
|
|
+ return GSS_C_NO_OID;
|
|
+ }
|
|
+
|
|
+#undef SKIP_KEX_NAME
|
|
+
|
|
+ while (gss_enc2oid[i].encoded != NULL &&
|
|
+ strcmp(name, gss_enc2oid[i].encoded) != 0)
|
|
+ i++;
|
|
+
|
|
+ if (gss_enc2oid[i].oid != NULL && ctx != NULL)
|
|
+ ssh_gssapi_set_oid(ctx, gss_enc2oid[i].oid);
|
|
+
|
|
+ return gss_enc2oid[i].oid;
|
|
+}
|
|
+
|
|
/* Check that the OID in a data stream matches that in the context */
|
|
int
|
|
ssh_gssapi_check_oid(Gssctxt *ctx, void *data, size_t len)
|
|
@@ -218,7 +398,7 @@ ssh_gssapi_init_ctx(Gssctxt *ctx, int deleg_creds, gss_buffer_desc *recv_tok,
|
|
}
|
|
|
|
ctx->major = gss_init_sec_context(&ctx->minor,
|
|
- GSS_C_NO_CREDENTIAL, &ctx->context, ctx->name, ctx->oid,
|
|
+ ctx->client_creds, &ctx->context, ctx->name, ctx->oid,
|
|
GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG | deleg_flag,
|
|
0, NULL, recv_tok, NULL, send_tok, flags, NULL);
|
|
|
|
@@ -247,9 +427,43 @@ ssh_gssapi_import_name(Gssctxt *ctx, const char *host)
|
|
return (ctx->major);
|
|
}
|
|
|
|
+OM_uint32
|
|
+ssh_gssapi_client_identity(Gssctxt *ctx, const char *name)
|
|
+{
|
|
+ gss_buffer_desc gssbuf;
|
|
+ gss_name_t gssname;
|
|
+ OM_uint32 status;
|
|
+ gss_OID_set oidset;
|
|
+
|
|
+ gssbuf.value = (void *) name;
|
|
+ gssbuf.length = strlen(gssbuf.value);
|
|
+
|
|
+ gss_create_empty_oid_set(&status, &oidset);
|
|
+ gss_add_oid_set_member(&status, ctx->oid, &oidset);
|
|
+
|
|
+ ctx->major = gss_import_name(&ctx->minor, &gssbuf,
|
|
+ GSS_C_NT_USER_NAME, &gssname);
|
|
+
|
|
+ if (!ctx->major)
|
|
+ ctx->major = gss_acquire_cred(&ctx->minor,
|
|
+ gssname, 0, oidset, GSS_C_INITIATE,
|
|
+ &ctx->client_creds, NULL, NULL);
|
|
+
|
|
+ gss_release_name(&status, &gssname);
|
|
+ gss_release_oid_set(&status, &oidset);
|
|
+
|
|
+ if (ctx->major)
|
|
+ ssh_gssapi_error(ctx);
|
|
+
|
|
+ return(ctx->major);
|
|
+}
|
|
+
|
|
OM_uint32
|
|
ssh_gssapi_sign(Gssctxt *ctx, gss_buffer_t buffer, gss_buffer_t hash)
|
|
{
|
|
+ if (ctx == NULL)
|
|
+ return -1;
|
|
+
|
|
if ((ctx->major = gss_get_mic(&ctx->minor, ctx->context,
|
|
GSS_C_QOP_DEFAULT, buffer, hash)))
|
|
ssh_gssapi_error(ctx);
|
|
@@ -257,6 +471,19 @@ ssh_gssapi_sign(Gssctxt *ctx, gss_buffer_t buffer, gss_buffer_t hash)
|
|
return (ctx->major);
|
|
}
|
|
|
|
+/* Priviledged when used by server */
|
|
+OM_uint32
|
|
+ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
|
|
+{
|
|
+ if (ctx == NULL)
|
|
+ return -1;
|
|
+
|
|
+ ctx->major = gss_verify_mic(&ctx->minor, ctx->context,
|
|
+ gssbuf, gssmic, NULL);
|
|
+
|
|
+ return (ctx->major);
|
|
+}
|
|
+
|
|
void
|
|
ssh_gssapi_buildmic(struct sshbuf *b, const char *user, const char *service,
|
|
const char *context)
|
|
@@ -273,11 +500,16 @@ ssh_gssapi_buildmic(struct sshbuf *b, const char *user, const char *service,
|
|
}
|
|
|
|
int
|
|
-ssh_gssapi_check_mechanism(Gssctxt **ctx, gss_OID oid, const char *host)
|
|
+ssh_gssapi_check_mechanism(Gssctxt **ctx, gss_OID oid, const char *host,
|
|
+ const char *client)
|
|
{
|
|
gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
|
|
OM_uint32 major, minor;
|
|
gss_OID_desc spnego_oid = {6, (void *)"\x2B\x06\x01\x05\x05\x02"};
|
|
+ Gssctxt *intctx = NULL;
|
|
+
|
|
+ if (ctx == NULL)
|
|
+ ctx = &intctx;
|
|
|
|
/* RFC 4462 says we MUST NOT do SPNEGO */
|
|
if (oid->length == spnego_oid.length &&
|
|
@@ -287,6 +519,10 @@ ssh_gssapi_check_mechanism(Gssctxt **ctx, gss_OID oid, const char *host)
|
|
ssh_gssapi_build_ctx(ctx);
|
|
ssh_gssapi_set_oid(*ctx, oid);
|
|
major = ssh_gssapi_import_name(*ctx, host);
|
|
+
|
|
+ if (!GSS_ERROR(major) && client)
|
|
+ major = ssh_gssapi_client_identity(*ctx, client);
|
|
+
|
|
if (!GSS_ERROR(major)) {
|
|
major = ssh_gssapi_init_ctx(*ctx, 0, GSS_C_NO_BUFFER, &token,
|
|
NULL);
|
|
@@ -296,10 +532,66 @@ ssh_gssapi_check_mechanism(Gssctxt **ctx, gss_OID oid, const char *host)
|
|
GSS_C_NO_BUFFER);
|
|
}
|
|
|
|
- if (GSS_ERROR(major))
|
|
+ if (GSS_ERROR(major) || intctx != NULL)
|
|
ssh_gssapi_delete_ctx(ctx);
|
|
|
|
return (!GSS_ERROR(major));
|
|
}
|
|
|
|
+int
|
|
+ssh_gssapi_credentials_updated(Gssctxt *ctxt) {
|
|
+ static gss_name_t saved_name = GSS_C_NO_NAME;
|
|
+ static OM_uint32 saved_lifetime = 0;
|
|
+ static gss_OID saved_mech = GSS_C_NO_OID;
|
|
+ static gss_name_t name;
|
|
+ static OM_uint32 last_call = 0;
|
|
+ OM_uint32 lifetime, now, major, minor;
|
|
+ int equal;
|
|
+
|
|
+ now = time(NULL);
|
|
+
|
|
+ if (ctxt) {
|
|
+ debug("Rekey has happened - updating saved versions");
|
|
+
|
|
+ if (saved_name != GSS_C_NO_NAME)
|
|
+ gss_release_name(&minor, &saved_name);
|
|
+
|
|
+ major = gss_inquire_cred(&minor, GSS_C_NO_CREDENTIAL,
|
|
+ &saved_name, &saved_lifetime, NULL, NULL);
|
|
+
|
|
+ if (!GSS_ERROR(major)) {
|
|
+ saved_mech = ctxt->oid;
|
|
+ saved_lifetime+= now;
|
|
+ } else {
|
|
+ /* Handle the error */
|
|
+ }
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ if (now - last_call < 10)
|
|
+ return 0;
|
|
+
|
|
+ last_call = now;
|
|
+
|
|
+ if (saved_mech == GSS_C_NO_OID)
|
|
+ return 0;
|
|
+
|
|
+ major = gss_inquire_cred(&minor, GSS_C_NO_CREDENTIAL,
|
|
+ &name, &lifetime, NULL, NULL);
|
|
+ if (major == GSS_S_CREDENTIALS_EXPIRED)
|
|
+ return 0;
|
|
+ else if (GSS_ERROR(major))
|
|
+ return 0;
|
|
+
|
|
+ major = gss_compare_name(&minor, saved_name, name, &equal);
|
|
+ gss_release_name(&minor, &name);
|
|
+ if (GSS_ERROR(major))
|
|
+ return 0;
|
|
+
|
|
+ if (equal && (saved_lifetime < lifetime + now - 10))
|
|
+ return 1;
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
#endif /* GSSAPI */
|
|
diff --git a/gss-serv-krb5.c b/gss-serv-krb5.c
|
|
index a151bc1e..8d2b677f 100644
|
|
--- a/gss-serv-krb5.c
|
|
+++ b/gss-serv-krb5.c
|
|
@@ -1,7 +1,7 @@
|
|
/* $OpenBSD: gss-serv-krb5.c,v 1.9 2018/07/09 21:37:55 markus Exp $ */
|
|
|
|
/*
|
|
- * Copyright (c) 2001-2003 Simon Wilkinson. All rights reserved.
|
|
+ * Copyright (c) 2001-2007 Simon Wilkinson. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
@@ -120,7 +120,7 @@ ssh_gssapi_krb5_storecreds(ssh_gssapi_client *client)
|
|
krb5_error_code problem;
|
|
krb5_principal princ;
|
|
OM_uint32 maj_status, min_status;
|
|
- int len;
|
|
+ const char *new_ccname, *new_cctype;
|
|
const char *errmsg;
|
|
|
|
if (client->creds == NULL) {
|
|
@@ -180,11 +180,26 @@ ssh_gssapi_krb5_storecreds(ssh_gssapi_client *client)
|
|
return;
|
|
}
|
|
|
|
- client->store.filename = xstrdup(krb5_cc_get_name(krb_context, ccache));
|
|
+ new_cctype = krb5_cc_get_type(krb_context, ccache);
|
|
+ new_ccname = krb5_cc_get_name(krb_context, ccache);
|
|
+
|
|
client->store.envvar = "KRB5CCNAME";
|
|
- len = strlen(client->store.filename) + 6;
|
|
- client->store.envval = xmalloc(len);
|
|
- snprintf(client->store.envval, len, "FILE:%s", client->store.filename);
|
|
+#ifdef USE_CCAPI
|
|
+ xasprintf(&client->store.envval, "API:%s", new_ccname);
|
|
+ client->store.filename = NULL;
|
|
+#else
|
|
+ if (new_ccname[0] == ':')
|
|
+ new_ccname++;
|
|
+ xasprintf(&client->store.envval, "%s:%s", new_cctype, new_ccname);
|
|
+ if (strcmp(new_cctype, "DIR") == 0) {
|
|
+ char *p;
|
|
+ p = strrchr(client->store.envval, '/');
|
|
+ if (p)
|
|
+ *p = '\0';
|
|
+ }
|
|
+ if ((strcmp(new_cctype, "FILE") == 0) || (strcmp(new_cctype, "DIR") == 0))
|
|
+ client->store.filename = xstrdup(new_ccname);
|
|
+#endif
|
|
|
|
#ifdef USE_PAM
|
|
if (options.use_pam)
|
|
@@ -193,9 +208,76 @@ ssh_gssapi_krb5_storecreds(ssh_gssapi_client *client)
|
|
|
|
krb5_cc_close(krb_context, ccache);
|
|
|
|
+ client->store.data = krb_context;
|
|
+
|
|
return;
|
|
}
|
|
|
|
+int
|
|
+ssh_gssapi_krb5_updatecreds(ssh_gssapi_ccache *store,
|
|
+ ssh_gssapi_client *client)
|
|
+{
|
|
+ krb5_ccache ccache = NULL;
|
|
+ krb5_principal principal = NULL;
|
|
+ char *name = NULL;
|
|
+ krb5_error_code problem;
|
|
+ OM_uint32 maj_status, min_status;
|
|
+
|
|
+ if ((problem = krb5_cc_resolve(krb_context, store->envval, &ccache))) {
|
|
+ logit("krb5_cc_resolve(): %.100s",
|
|
+ krb5_get_err_text(krb_context, problem));
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ /* Find out who the principal in this cache is */
|
|
+ if ((problem = krb5_cc_get_principal(krb_context, ccache,
|
|
+ &principal))) {
|
|
+ logit("krb5_cc_get_principal(): %.100s",
|
|
+ krb5_get_err_text(krb_context, problem));
|
|
+ krb5_cc_close(krb_context, ccache);
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ if ((problem = krb5_unparse_name(krb_context, principal, &name))) {
|
|
+ logit("krb5_unparse_name(): %.100s",
|
|
+ krb5_get_err_text(krb_context, problem));
|
|
+ krb5_free_principal(krb_context, principal);
|
|
+ krb5_cc_close(krb_context, ccache);
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+
|
|
+ if (strcmp(name,client->exportedname.value)!=0) {
|
|
+ debug("Name in local credentials cache differs. Not storing");
|
|
+ krb5_free_principal(krb_context, principal);
|
|
+ krb5_cc_close(krb_context, ccache);
|
|
+ krb5_free_unparsed_name(krb_context, name);
|
|
+ return 0;
|
|
+ }
|
|
+ krb5_free_unparsed_name(krb_context, name);
|
|
+
|
|
+ /* Name matches, so lets get on with it! */
|
|
+
|
|
+ if ((problem = krb5_cc_initialize(krb_context, ccache, principal))) {
|
|
+ logit("krb5_cc_initialize(): %.100s",
|
|
+ krb5_get_err_text(krb_context, problem));
|
|
+ krb5_free_principal(krb_context, principal);
|
|
+ krb5_cc_close(krb_context, ccache);
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ krb5_free_principal(krb_context, principal);
|
|
+
|
|
+ if ((maj_status = gss_krb5_copy_ccache(&min_status, client->creds,
|
|
+ ccache))) {
|
|
+ logit("gss_krb5_copy_ccache() failed. Sorry!");
|
|
+ krb5_cc_close(krb_context, ccache);
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ return 1;
|
|
+}
|
|
+
|
|
ssh_gssapi_mech gssapi_kerberos_mech = {
|
|
"toWM5Slw5Ew8Mqkay+al2g==",
|
|
"Kerberos",
|
|
@@ -203,7 +285,8 @@ ssh_gssapi_mech gssapi_kerberos_mech = {
|
|
NULL,
|
|
&ssh_gssapi_krb5_userok,
|
|
NULL,
|
|
- &ssh_gssapi_krb5_storecreds
|
|
+ &ssh_gssapi_krb5_storecreds,
|
|
+ &ssh_gssapi_krb5_updatecreds
|
|
};
|
|
|
|
#endif /* KRB5 */
|
|
diff --git a/gss-serv.c b/gss-serv.c
|
|
index ab3a15f0..6ce56e92 100644
|
|
--- a/gss-serv.c
|
|
+++ b/gss-serv.c
|
|
@@ -1,7 +1,7 @@
|
|
/* $OpenBSD: gss-serv.c,v 1.31 2018/07/09 21:37:55 markus Exp $ */
|
|
|
|
/*
|
|
- * Copyright (c) 2001-2003 Simon Wilkinson. All rights reserved.
|
|
+ * Copyright (c) 2001-2009 Simon Wilkinson. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
@@ -44,17 +44,19 @@
|
|
#include "session.h"
|
|
#include "misc.h"
|
|
#include "servconf.h"
|
|
+#include "uidswap.h"
|
|
|
|
#include "ssh-gss.h"
|
|
+#include "monitor_wrap.h"
|
|
|
|
extern ServerOptions options;
|
|
|
|
static ssh_gssapi_client gssapi_client =
|
|
- { GSS_C_EMPTY_BUFFER, GSS_C_EMPTY_BUFFER,
|
|
- GSS_C_NO_CREDENTIAL, NULL, {NULL, NULL, NULL, NULL}};
|
|
+ { GSS_C_EMPTY_BUFFER, GSS_C_EMPTY_BUFFER, GSS_C_NO_CREDENTIAL,
|
|
+ GSS_C_NO_NAME, NULL, {NULL, NULL, NULL, NULL, NULL}, 0, 0};
|
|
|
|
ssh_gssapi_mech gssapi_null_mech =
|
|
- { NULL, NULL, {0, NULL}, NULL, NULL, NULL, NULL};
|
|
+ { NULL, NULL, {0, NULL}, NULL, NULL, NULL, NULL, NULL};
|
|
|
|
#ifdef KRB5
|
|
extern ssh_gssapi_mech gssapi_kerberos_mech;
|
|
@@ -140,6 +142,29 @@ ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID oid)
|
|
return (ssh_gssapi_acquire_cred(*ctx));
|
|
}
|
|
|
|
+/* Unprivileged */
|
|
+char *
|
|
+ssh_gssapi_server_mechanisms(void) {
|
|
+ if (supported_oids == NULL)
|
|
+ ssh_gssapi_prepare_supported_oids();
|
|
+ return (ssh_gssapi_kex_mechs(supported_oids,
|
|
+ &ssh_gssapi_server_check_mech, NULL, NULL,
|
|
+ options.gss_kex_algorithms));
|
|
+}
|
|
+
|
|
+/* Unprivileged */
|
|
+int
|
|
+ssh_gssapi_server_check_mech(Gssctxt **dum, gss_OID oid, const char *data,
|
|
+ const char *dummy) {
|
|
+ Gssctxt *ctx = NULL;
|
|
+ int res;
|
|
+
|
|
+ res = !GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctx, oid)));
|
|
+ ssh_gssapi_delete_ctx(&ctx);
|
|
+
|
|
+ return (res);
|
|
+}
|
|
+
|
|
/* Unprivileged */
|
|
void
|
|
ssh_gssapi_supported_oids(gss_OID_set *oidset)
|
|
@@ -150,7 +175,9 @@ ssh_gssapi_supported_oids(gss_OID_set *oidset)
|
|
gss_OID_set supported;
|
|
|
|
gss_create_empty_oid_set(&min_status, oidset);
|
|
- gss_indicate_mechs(&min_status, &supported);
|
|
+
|
|
+ if (GSS_ERROR(gss_indicate_mechs(&min_status, &supported)))
|
|
+ return;
|
|
|
|
while (supported_mechs[i]->name != NULL) {
|
|
if (GSS_ERROR(gss_test_oid_set_member(&min_status,
|
|
@@ -276,8 +303,48 @@ OM_uint32
|
|
ssh_gssapi_getclient(Gssctxt *ctx, ssh_gssapi_client *client)
|
|
{
|
|
int i = 0;
|
|
+ int equal = 0;
|
|
+ gss_name_t new_name = GSS_C_NO_NAME;
|
|
+ gss_buffer_desc ename = GSS_C_EMPTY_BUFFER;
|
|
+
|
|
+ if (options.gss_store_rekey && client->used && ctx->client_creds) {
|
|
+ if (client->mech->oid.length != ctx->oid->length ||
|
|
+ (memcmp(client->mech->oid.elements,
|
|
+ ctx->oid->elements, ctx->oid->length) !=0)) {
|
|
+ debug("Rekeyed credentials have different mechanism");
|
|
+ return GSS_S_COMPLETE;
|
|
+ }
|
|
+
|
|
+ if ((ctx->major = gss_inquire_cred_by_mech(&ctx->minor,
|
|
+ ctx->client_creds, ctx->oid, &new_name,
|
|
+ NULL, NULL, NULL))) {
|
|
+ ssh_gssapi_error(ctx);
|
|
+ return (ctx->major);
|
|
+ }
|
|
|
|
- gss_buffer_desc ename;
|
|
+ ctx->major = gss_compare_name(&ctx->minor, client->name,
|
|
+ new_name, &equal);
|
|
+
|
|
+ if (GSS_ERROR(ctx->major)) {
|
|
+ ssh_gssapi_error(ctx);
|
|
+ return (ctx->major);
|
|
+ }
|
|
+
|
|
+ if (!equal) {
|
|
+ debug("Rekeyed credentials have different name");
|
|
+ return GSS_S_COMPLETE;
|
|
+ }
|
|
+
|
|
+ debug("Marking rekeyed credentials for export");
|
|
+
|
|
+ gss_release_name(&ctx->minor, &client->name);
|
|
+ gss_release_cred(&ctx->minor, &client->creds);
|
|
+ client->name = new_name;
|
|
+ client->creds = ctx->client_creds;
|
|
+ ctx->client_creds = GSS_C_NO_CREDENTIAL;
|
|
+ client->updated = 1;
|
|
+ return GSS_S_COMPLETE;
|
|
+ }
|
|
|
|
client->mech = NULL;
|
|
|
|
@@ -292,6 +359,13 @@ ssh_gssapi_getclient(Gssctxt *ctx, ssh_gssapi_client *client)
|
|
if (client->mech == NULL)
|
|
return GSS_S_FAILURE;
|
|
|
|
+ if (ctx->client_creds &&
|
|
+ (ctx->major = gss_inquire_cred_by_mech(&ctx->minor,
|
|
+ ctx->client_creds, ctx->oid, &client->name, NULL, NULL, NULL))) {
|
|
+ ssh_gssapi_error(ctx);
|
|
+ return (ctx->major);
|
|
+ }
|
|
+
|
|
if ((ctx->major = gss_display_name(&ctx->minor, ctx->client,
|
|
&client->displayname, NULL))) {
|
|
ssh_gssapi_error(ctx);
|
|
@@ -309,6 +383,8 @@ ssh_gssapi_getclient(Gssctxt *ctx, ssh_gssapi_client *client)
|
|
return (ctx->major);
|
|
}
|
|
|
|
+ gss_release_buffer(&ctx->minor, &ename);
|
|
+
|
|
/* We can't copy this structure, so we just move the pointer to it */
|
|
client->creds = ctx->client_creds;
|
|
ctx->client_creds = GSS_C_NO_CREDENTIAL;
|
|
@@ -319,11 +395,20 @@ ssh_gssapi_getclient(Gssctxt *ctx, ssh_gssapi_client *client)
|
|
void
|
|
ssh_gssapi_cleanup_creds(void)
|
|
{
|
|
- if (gssapi_client.store.filename != NULL) {
|
|
- /* Unlink probably isn't sufficient */
|
|
- debug("removing gssapi cred file\"%s\"",
|
|
- gssapi_client.store.filename);
|
|
- unlink(gssapi_client.store.filename);
|
|
+ krb5_ccache ccache = NULL;
|
|
+ krb5_error_code problem;
|
|
+
|
|
+ if (gssapi_client.store.data != NULL) {
|
|
+ if ((problem = krb5_cc_resolve(gssapi_client.store.data, gssapi_client.store.envval, &ccache))) {
|
|
+ debug("%s: krb5_cc_resolve(): %.100s", __func__,
|
|
+ krb5_get_err_text(gssapi_client.store.data, problem));
|
|
+ } else if ((problem = krb5_cc_destroy(gssapi_client.store.data, ccache))) {
|
|
+ debug("%s: krb5_cc_destroy(): %.100s", __func__,
|
|
+ krb5_get_err_text(gssapi_client.store.data, problem));
|
|
+ } else {
|
|
+ krb5_free_context(gssapi_client.store.data);
|
|
+ gssapi_client.store.data = NULL;
|
|
+ }
|
|
}
|
|
}
|
|
|
|
@@ -356,19 +441,23 @@ ssh_gssapi_do_child(char ***envp, u_int *envsizep)
|
|
|
|
/* Privileged */
|
|
int
|
|
-ssh_gssapi_userok(char *user)
|
|
+ssh_gssapi_userok(char *user, struct passwd *pw, int kex)
|
|
{
|
|
OM_uint32 lmin;
|
|
|
|
+ (void) kex; /* used in privilege separation */
|
|
+
|
|
if (gssapi_client.exportedname.length == 0 ||
|
|
gssapi_client.exportedname.value == NULL) {
|
|
debug("No suitable client data");
|
|
return 0;
|
|
}
|
|
if (gssapi_client.mech && gssapi_client.mech->userok)
|
|
- if ((*gssapi_client.mech->userok)(&gssapi_client, user))
|
|
+ if ((*gssapi_client.mech->userok)(&gssapi_client, user)) {
|
|
+ gssapi_client.used = 1;
|
|
+ gssapi_client.store.owner = pw;
|
|
return 1;
|
|
- else {
|
|
+ } else {
|
|
/* Destroy delegated credentials if userok fails */
|
|
gss_release_buffer(&lmin, &gssapi_client.displayname);
|
|
gss_release_buffer(&lmin, &gssapi_client.exportedname);
|
|
@@ -382,14 +471,90 @@ ssh_gssapi_userok(char *user)
|
|
return (0);
|
|
}
|
|
|
|
-/* Privileged */
|
|
-OM_uint32
|
|
-ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
|
|
+/* These bits are only used for rekeying. The unpriviledged child is running
|
|
+ * as the user, the monitor is root.
|
|
+ *
|
|
+ * In the child, we want to :
|
|
+ * *) Ask the monitor to store our credentials into the store we specify
|
|
+ * *) If it succeeds, maybe do a PAM update
|
|
+ */
|
|
+
|
|
+/* Stuff for PAM */
|
|
+
|
|
+#ifdef USE_PAM
|
|
+static int ssh_gssapi_simple_conv(int n, const struct pam_message **msg,
|
|
+ struct pam_response **resp, void *data)
|
|
{
|
|
- ctx->major = gss_verify_mic(&ctx->minor, ctx->context,
|
|
- gssbuf, gssmic, NULL);
|
|
+ return (PAM_CONV_ERR);
|
|
+}
|
|
+#endif
|
|
|
|
- return (ctx->major);
|
|
+void
|
|
+ssh_gssapi_rekey_creds(void) {
|
|
+ int ok;
|
|
+#ifdef USE_PAM
|
|
+ int ret;
|
|
+ pam_handle_t *pamh = NULL;
|
|
+ struct pam_conv pamconv = {ssh_gssapi_simple_conv, NULL};
|
|
+ char *envstr;
|
|
+#endif
|
|
+
|
|
+ if (gssapi_client.store.filename == NULL &&
|
|
+ gssapi_client.store.envval == NULL &&
|
|
+ gssapi_client.store.envvar == NULL)
|
|
+ return;
|
|
+
|
|
+ ok = PRIVSEP(ssh_gssapi_update_creds(&gssapi_client.store));
|
|
+
|
|
+ if (!ok)
|
|
+ return;
|
|
+
|
|
+ debug("Rekeyed credentials stored successfully");
|
|
+
|
|
+ /* Actually managing to play with the ssh pam stack from here will
|
|
+ * be next to impossible. In any case, we may want different options
|
|
+ * for rekeying. So, use our own :)
|
|
+ */
|
|
+#ifdef USE_PAM
|
|
+ if (!use_privsep) {
|
|
+ debug("Not even going to try and do PAM with privsep disabled");
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ ret = pam_start("sshd-rekey", gssapi_client.store.owner->pw_name,
|
|
+ &pamconv, &pamh);
|
|
+ if (ret)
|
|
+ return;
|
|
+
|
|
+ xasprintf(&envstr, "%s=%s", gssapi_client.store.envvar,
|
|
+ gssapi_client.store.envval);
|
|
+
|
|
+ ret = pam_putenv(pamh, envstr);
|
|
+ if (!ret)
|
|
+ pam_setcred(pamh, PAM_REINITIALIZE_CRED);
|
|
+ pam_end(pamh, PAM_SUCCESS);
|
|
+#endif
|
|
+}
|
|
+
|
|
+int
|
|
+ssh_gssapi_update_creds(ssh_gssapi_ccache *store) {
|
|
+ int ok = 0;
|
|
+
|
|
+ /* Check we've got credentials to store */
|
|
+ if (!gssapi_client.updated)
|
|
+ return 0;
|
|
+
|
|
+ gssapi_client.updated = 0;
|
|
+
|
|
+ temporarily_use_uid(gssapi_client.store.owner);
|
|
+ if (gssapi_client.mech && gssapi_client.mech->updatecreds)
|
|
+ ok = (*gssapi_client.mech->updatecreds)(store, &gssapi_client);
|
|
+ else
|
|
+ debug("No update function for this mechanism");
|
|
+
|
|
+ restore_uid();
|
|
+
|
|
+ return ok;
|
|
}
|
|
|
|
/* Privileged */
|
|
diff --git a/kex.c b/kex.c
|
|
index ce85f043..574c7609 100644
|
|
--- a/kex.c
|
|
+++ b/kex.c
|
|
@@ -57,11 +57,16 @@
|
|
#include "misc.h"
|
|
#include "dispatch.h"
|
|
#include "monitor.h"
|
|
+#include "xmalloc.h"
|
|
|
|
#include "ssherr.h"
|
|
#include "sshbuf.h"
|
|
#include "digest.h"
|
|
|
|
+#ifdef GSSAPI
|
|
+#include "ssh-gss.h"
|
|
+#endif
|
|
+
|
|
/* prototype */
|
|
static int kex_choose_conf(struct ssh *);
|
|
static int kex_input_newkeys(int, u_int32_t, struct ssh *);
|
|
@@ -115,15 +120,28 @@ static const struct kexalg kexalgs[] = {
|
|
#endif /* HAVE_EVP_SHA256 || !WITH_OPENSSL */
|
|
{ NULL, 0, -1, -1},
|
|
};
|
|
+static const struct kexalg gss_kexalgs[] = {
|
|
+#ifdef GSSAPI
|
|
+ { KEX_GSS_GEX_SHA1_ID, KEX_GSS_GEX_SHA1, 0, SSH_DIGEST_SHA1 },
|
|
+ { KEX_GSS_GRP1_SHA1_ID, KEX_GSS_GRP1_SHA1, 0, SSH_DIGEST_SHA1 },
|
|
+ { KEX_GSS_GRP14_SHA1_ID, KEX_GSS_GRP14_SHA1, 0, SSH_DIGEST_SHA1 },
|
|
+ { KEX_GSS_GRP14_SHA256_ID, KEX_GSS_GRP14_SHA256, 0, SSH_DIGEST_SHA256 },
|
|
+ { KEX_GSS_GRP16_SHA512_ID, KEX_GSS_GRP16_SHA512, 0, SSH_DIGEST_SHA512 },
|
|
+ { KEX_GSS_NISTP256_SHA256_ID, KEX_GSS_NISTP256_SHA256,
|
|
+ NID_X9_62_prime256v1, SSH_DIGEST_SHA256 },
|
|
+ { KEX_GSS_C25519_SHA256_ID, KEX_GSS_C25519_SHA256, 0, SSH_DIGEST_SHA256 },
|
|
+#endif
|
|
+ { NULL, 0, -1, -1},
|
|
+};
|
|
|
|
-char *
|
|
-kex_alg_list(char sep)
|
|
+static char *
|
|
+kex_alg_list_internal(char sep, const struct kexalg *algs)
|
|
{
|
|
char *ret = NULL, *tmp;
|
|
size_t nlen, rlen = 0;
|
|
const struct kexalg *k;
|
|
|
|
- for (k = kexalgs; k->name != NULL; k++) {
|
|
+ for (k = algs; k->name != NULL; k++) {
|
|
if (ret != NULL)
|
|
ret[rlen++] = sep;
|
|
nlen = strlen(k->name);
|
|
@@ -138,6 +156,18 @@ kex_alg_list(char sep)
|
|
return ret;
|
|
}
|
|
|
|
+char *
|
|
+kex_alg_list(char sep)
|
|
+{
|
|
+ return kex_alg_list_internal(sep, kexalgs);
|
|
+}
|
|
+
|
|
+char *
|
|
+kex_gss_alg_list(char sep)
|
|
+{
|
|
+ return kex_alg_list_internal(sep, gss_kexalgs);
|
|
+}
|
|
+
|
|
static const struct kexalg *
|
|
kex_alg_by_name(const char *name)
|
|
{
|
|
@@ -147,6 +177,10 @@ kex_alg_by_name(const char *name)
|
|
if (strcmp(k->name, name) == 0)
|
|
return k;
|
|
}
|
|
+ for (k = gss_kexalgs; k->name != NULL; k++) {
|
|
+ if (strncmp(k->name, name, strlen(k->name)) == 0)
|
|
+ return k;
|
|
+ }
|
|
return NULL;
|
|
}
|
|
|
|
@@ -315,6 +349,29 @@ kex_assemble_names(char **listp, const char *def, const char *all)
|
|
return r;
|
|
}
|
|
|
|
+/* Validate GSS KEX method name list */
|
|
+int
|
|
+kex_gss_names_valid(const char *names)
|
|
+{
|
|
+ char *s, *cp, *p;
|
|
+
|
|
+ if (names == NULL || *names == '\0')
|
|
+ return 0;
|
|
+ s = cp = xstrdup(names);
|
|
+ for ((p = strsep(&cp, ",")); p && *p != '\0';
|
|
+ (p = strsep(&cp, ","))) {
|
|
+ if (strncmp(p, "gss-", 4) != 0
|
|
+ || kex_alg_by_name(p) == NULL) {
|
|
+ error("Unsupported KEX algorithm \"%.100s\"", p);
|
|
+ free(s);
|
|
+ return 0;
|
|
+ }
|
|
+ }
|
|
+ debug3("gss kex names ok: [%s]", names);
|
|
+ free(s);
|
|
+ return 1;
|
|
+}
|
|
+
|
|
/* put algorithm proposal into buffer */
|
|
int
|
|
kex_prop2buf(struct sshbuf *b, char *proposal[PROPOSAL_MAX])
|
|
@@ -698,6 +755,9 @@ kex_free(struct kex *kex)
|
|
sshbuf_free(kex->server_version);
|
|
sshbuf_free(kex->client_pub);
|
|
free(kex->session_id);
|
|
+#ifdef GSSAPI
|
|
+ free(kex->gss_host);
|
|
+#endif /* GSSAPI */
|
|
free(kex->failed_choice);
|
|
free(kex->hostkey_alg);
|
|
free(kex->name);
|
|
diff --git a/kex.h b/kex.h
|
|
index a5ae6ac0..fe714141 100644
|
|
--- a/kex.h
|
|
+++ b/kex.h
|
|
@@ -102,6 +102,15 @@ enum kex_exchange {
|
|
KEX_ECDH_SHA2,
|
|
KEX_C25519_SHA256,
|
|
KEX_KEM_SNTRUP4591761X25519_SHA512,
|
|
+#ifdef GSSAPI
|
|
+ KEX_GSS_GRP1_SHA1,
|
|
+ KEX_GSS_GRP14_SHA1,
|
|
+ KEX_GSS_GRP14_SHA256,
|
|
+ KEX_GSS_GRP16_SHA512,
|
|
+ KEX_GSS_GEX_SHA1,
|
|
+ KEX_GSS_NISTP256_SHA256,
|
|
+ KEX_GSS_C25519_SHA256,
|
|
+#endif
|
|
KEX_MAX
|
|
};
|
|
|
|
@@ -153,6 +162,12 @@ struct kex {
|
|
u_int flags;
|
|
int hash_alg;
|
|
int ec_nid;
|
|
+#ifdef GSSAPI
|
|
+ int gss_deleg_creds;
|
|
+ int gss_trust_dns;
|
|
+ char *gss_host;
|
|
+ char *gss_client;
|
|
+#endif
|
|
char *failed_choice;
|
|
int (*verify_host_key)(struct sshkey *, struct ssh *);
|
|
struct sshkey *(*load_host_public_key)(int, int, struct ssh *);
|
|
@@ -174,8 +189,10 @@ struct kex {
|
|
|
|
int kex_names_valid(const char *);
|
|
char *kex_alg_list(char);
|
|
+char *kex_gss_alg_list(char);
|
|
char *kex_names_cat(const char *, const char *);
|
|
int kex_assemble_names(char **, const char *, const char *);
|
|
+int kex_gss_names_valid(const char *);
|
|
|
|
int kex_exchange_identification(struct ssh *, int, const char *);
|
|
|
|
@@ -202,6 +219,12 @@ int kexgex_client(struct ssh *);
|
|
int kexgex_server(struct ssh *);
|
|
int kex_gen_client(struct ssh *);
|
|
int kex_gen_server(struct ssh *);
|
|
+#if defined(GSSAPI) && defined(WITH_OPENSSL)
|
|
+int kexgssgex_client(struct ssh *);
|
|
+int kexgssgex_server(struct ssh *);
|
|
+int kexgss_client(struct ssh *);
|
|
+int kexgss_server(struct ssh *);
|
|
+#endif
|
|
|
|
int kex_dh_keypair(struct kex *);
|
|
int kex_dh_enc(struct kex *, const struct sshbuf *, struct sshbuf **,
|
|
@@ -234,6 +257,12 @@ int kexgex_hash(int, const struct sshbuf *, const struct sshbuf *,
|
|
const BIGNUM *, const u_char *, size_t,
|
|
u_char *, size_t *);
|
|
|
|
+int kex_gen_hash(int hash_alg, const struct sshbuf *client_version,
|
|
+ const struct sshbuf *server_version, const struct sshbuf *client_kexinit,
|
|
+ const struct sshbuf *server_kexinit, const struct sshbuf *server_host_key_blob,
|
|
+ const struct sshbuf *client_pub, const struct sshbuf *server_pub,
|
|
+ const struct sshbuf *shared_secret, u_char *hash, size_t *hashlen);
|
|
+
|
|
void kexc25519_keygen(u_char key[CURVE25519_SIZE], u_char pub[CURVE25519_SIZE])
|
|
__attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
|
|
__attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
|
|
diff --git a/kexdh.c b/kexdh.c
|
|
index 67133e33..edaa4676 100644
|
|
--- a/kexdh.c
|
|
+++ b/kexdh.c
|
|
@@ -48,13 +48,23 @@ kex_dh_keygen(struct kex *kex)
|
|
{
|
|
switch (kex->kex_type) {
|
|
case KEX_DH_GRP1_SHA1:
|
|
+#ifdef GSSAPI
|
|
+ case KEX_GSS_GRP1_SHA1:
|
|
+#endif
|
|
kex->dh = dh_new_group1();
|
|
break;
|
|
case KEX_DH_GRP14_SHA1:
|
|
case KEX_DH_GRP14_SHA256:
|
|
+#ifdef GSSAPI
|
|
+ case KEX_GSS_GRP14_SHA1:
|
|
+ case KEX_GSS_GRP14_SHA256:
|
|
+#endif
|
|
kex->dh = dh_new_group14();
|
|
break;
|
|
case KEX_DH_GRP16_SHA512:
|
|
+#ifdef GSSAPI
|
|
+ case KEX_GSS_GRP16_SHA512:
|
|
+#endif
|
|
kex->dh = dh_new_group16();
|
|
break;
|
|
case KEX_DH_GRP18_SHA512:
|
|
diff --git a/kexgen.c b/kexgen.c
|
|
index 69348b96..c0e8c2f4 100644
|
|
--- a/kexgen.c
|
|
+++ b/kexgen.c
|
|
@@ -44,7 +44,7 @@
|
|
static int input_kex_gen_init(int, u_int32_t, struct ssh *);
|
|
static int input_kex_gen_reply(int type, u_int32_t seq, struct ssh *ssh);
|
|
|
|
-static int
|
|
+int
|
|
kex_gen_hash(
|
|
int hash_alg,
|
|
const struct sshbuf *client_version,
|
|
diff --git a/kexgssc.c b/kexgssc.c
|
|
new file mode 100644
|
|
index 00000000..f6e1405e
|
|
--- /dev/null
|
|
+++ b/kexgssc.c
|
|
@@ -0,0 +1,606 @@
|
|
+/*
|
|
+ * Copyright (c) 2001-2009 Simon Wilkinson. All rights reserved.
|
|
+ *
|
|
+ * Redistribution and use in source and binary forms, with or without
|
|
+ * modification, are permitted provided that the following conditions
|
|
+ * are met:
|
|
+ * 1. Redistributions of source code must retain the above copyright
|
|
+ * notice, this list of conditions and the following disclaimer.
|
|
+ * 2. Redistributions in binary form must reproduce the above copyright
|
|
+ * notice, this list of conditions and the following disclaimer in the
|
|
+ * documentation and/or other materials provided with the distribution.
|
|
+ *
|
|
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
|
|
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
+ */
|
|
+
|
|
+#include "includes.h"
|
|
+
|
|
+#if defined(GSSAPI) && defined(WITH_OPENSSL)
|
|
+
|
|
+#include "includes.h"
|
|
+
|
|
+#include <openssl/crypto.h>
|
|
+#include <openssl/bn.h>
|
|
+
|
|
+#include <string.h>
|
|
+
|
|
+#include "xmalloc.h"
|
|
+#include "sshbuf.h"
|
|
+#include "ssh2.h"
|
|
+#include "sshkey.h"
|
|
+#include "cipher.h"
|
|
+#include "kex.h"
|
|
+#include "log.h"
|
|
+#include "packet.h"
|
|
+#include "dh.h"
|
|
+#include "digest.h"
|
|
+#include "ssherr.h"
|
|
+
|
|
+#include "ssh-gss.h"
|
|
+
|
|
+int
|
|
+kexgss_client(struct ssh *ssh)
|
|
+{
|
|
+ struct kex *kex = ssh->kex;
|
|
+ gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER,
|
|
+ recv_tok = GSS_C_EMPTY_BUFFER,
|
|
+ gssbuf, msg_tok = GSS_C_EMPTY_BUFFER, *token_ptr;
|
|
+ Gssctxt *ctxt;
|
|
+ OM_uint32 maj_status, min_status, ret_flags;
|
|
+ struct sshbuf *server_blob = NULL;
|
|
+ struct sshbuf *shared_secret = NULL;
|
|
+ struct sshbuf *server_host_key_blob = NULL;
|
|
+ struct sshbuf *empty = NULL;
|
|
+ u_char *msg;
|
|
+ int type = 0;
|
|
+ int first = 1;
|
|
+ u_char hash[SSH_DIGEST_MAX_LENGTH];
|
|
+ size_t hashlen;
|
|
+ u_char c;
|
|
+ int r;
|
|
+
|
|
+ /* Initialise our GSSAPI world */
|
|
+ ssh_gssapi_build_ctx(&ctxt);
|
|
+ if (ssh_gssapi_id_kex(ctxt, kex->name, kex->kex_type)
|
|
+ == GSS_C_NO_OID)
|
|
+ fatal("Couldn't identify host exchange");
|
|
+
|
|
+ if (ssh_gssapi_import_name(ctxt, kex->gss_host))
|
|
+ fatal("Couldn't import hostname");
|
|
+
|
|
+ if (kex->gss_client &&
|
|
+ ssh_gssapi_client_identity(ctxt, kex->gss_client))
|
|
+ fatal("Couldn't acquire client credentials");
|
|
+
|
|
+ /* Step 1 */
|
|
+ switch (kex->kex_type) {
|
|
+ case KEX_GSS_GRP1_SHA1:
|
|
+ case KEX_GSS_GRP14_SHA1:
|
|
+ case KEX_GSS_GRP14_SHA256:
|
|
+ case KEX_GSS_GRP16_SHA512:
|
|
+ r = kex_dh_keypair(kex);
|
|
+ break;
|
|
+ case KEX_GSS_NISTP256_SHA256:
|
|
+ r = kex_ecdh_keypair(kex);
|
|
+ break;
|
|
+ case KEX_GSS_C25519_SHA256:
|
|
+ r = kex_c25519_keypair(kex);
|
|
+ break;
|
|
+ default:
|
|
+ fatal("%s: Unexpected KEX type %d", __func__, kex->kex_type);
|
|
+ }
|
|
+ if (r != 0)
|
|
+ return r;
|
|
+
|
|
+ token_ptr = GSS_C_NO_BUFFER;
|
|
+
|
|
+ do {
|
|
+ debug("Calling gss_init_sec_context");
|
|
+
|
|
+ maj_status = ssh_gssapi_init_ctx(ctxt,
|
|
+ kex->gss_deleg_creds, token_ptr, &send_tok,
|
|
+ &ret_flags);
|
|
+
|
|
+ if (GSS_ERROR(maj_status)) {
|
|
+ /* XXX Useles code: Missing send? */
|
|
+ if (send_tok.length != 0) {
|
|
+ if ((r = sshpkt_start(ssh,
|
|
+ SSH2_MSG_KEXGSS_CONTINUE)) != 0 ||
|
|
+ (r = sshpkt_put_string(ssh, send_tok.value,
|
|
+ send_tok.length)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+ }
|
|
+ fatal("gss_init_context failed");
|
|
+ }
|
|
+
|
|
+ /* If we've got an old receive buffer get rid of it */
|
|
+ if (token_ptr != GSS_C_NO_BUFFER)
|
|
+ gss_release_buffer(&min_status, &recv_tok);
|
|
+
|
|
+ if (maj_status == GSS_S_COMPLETE) {
|
|
+ /* If mutual state flag is not true, kex fails */
|
|
+ if (!(ret_flags & GSS_C_MUTUAL_FLAG))
|
|
+ fatal("Mutual authentication failed");
|
|
+
|
|
+ /* If integ avail flag is not true kex fails */
|
|
+ if (!(ret_flags & GSS_C_INTEG_FLAG))
|
|
+ fatal("Integrity check failed");
|
|
+ }
|
|
+
|
|
+ /*
|
|
+ * If we have data to send, then the last message that we
|
|
+ * received cannot have been a 'complete'.
|
|
+ */
|
|
+ if (send_tok.length != 0) {
|
|
+ if (first) {
|
|
+ if ((r = sshpkt_start(ssh, SSH2_MSG_KEXGSS_INIT)) != 0 ||
|
|
+ (r = sshpkt_put_string(ssh, send_tok.value,
|
|
+ send_tok.length)) != 0 ||
|
|
+ (r = sshpkt_put_stringb(ssh, kex->client_pub)) != 0)
|
|
+ fatal("failed to construct packet: %s", ssh_err(r));
|
|
+ first = 0;
|
|
+ } else {
|
|
+ if ((r = sshpkt_start(ssh, SSH2_MSG_KEXGSS_CONTINUE)) != 0 ||
|
|
+ (r = sshpkt_put_string(ssh, send_tok.value,
|
|
+ send_tok.length)) != 0)
|
|
+ fatal("failed to construct packet: %s", ssh_err(r));
|
|
+ }
|
|
+ if ((r = sshpkt_send(ssh)) != 0)
|
|
+ fatal("failed to send packet: %s", ssh_err(r));
|
|
+ gss_release_buffer(&min_status, &send_tok);
|
|
+
|
|
+ /* If we've sent them data, they should reply */
|
|
+ do {
|
|
+ type = ssh_packet_read(ssh);
|
|
+ if (type == SSH2_MSG_KEXGSS_HOSTKEY) {
|
|
+ debug("Received KEXGSS_HOSTKEY");
|
|
+ if (server_host_key_blob)
|
|
+ fatal("Server host key received more than once");
|
|
+ if ((r = sshpkt_getb_froms(ssh, &server_host_key_blob)) != 0)
|
|
+ fatal("Failed to read server host key: %s", ssh_err(r));
|
|
+ }
|
|
+ } while (type == SSH2_MSG_KEXGSS_HOSTKEY);
|
|
+
|
|
+ switch (type) {
|
|
+ case SSH2_MSG_KEXGSS_CONTINUE:
|
|
+ debug("Received GSSAPI_CONTINUE");
|
|
+ if (maj_status == GSS_S_COMPLETE)
|
|
+ fatal("GSSAPI Continue received from server when complete");
|
|
+ if ((r = ssh_gssapi_sshpkt_get_buffer_desc(ssh,
|
|
+ &recv_tok)) != 0 ||
|
|
+ (r = sshpkt_get_end(ssh)) != 0)
|
|
+ fatal("Failed to read token: %s", ssh_err(r));
|
|
+ break;
|
|
+ case SSH2_MSG_KEXGSS_COMPLETE:
|
|
+ debug("Received GSSAPI_COMPLETE");
|
|
+ if (msg_tok.value != NULL)
|
|
+ fatal("Received GSSAPI_COMPLETE twice?");
|
|
+ if ((r = sshpkt_getb_froms(ssh, &server_blob)) != 0 ||
|
|
+ (r = ssh_gssapi_sshpkt_get_buffer_desc(ssh,
|
|
+ &msg_tok)) != 0)
|
|
+ fatal("Failed to read message: %s", ssh_err(r));
|
|
+
|
|
+ /* Is there a token included? */
|
|
+ if ((r = sshpkt_get_u8(ssh, &c)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+ if (c) {
|
|
+ if ((r = ssh_gssapi_sshpkt_get_buffer_desc(
|
|
+ ssh, &recv_tok)) != 0)
|
|
+ fatal("Failed to read token: %s", ssh_err(r));
|
|
+ /* If we're already complete - protocol error */
|
|
+ if (maj_status == GSS_S_COMPLETE)
|
|
+ sshpkt_disconnect(ssh, "Protocol error: received token when complete");
|
|
+ } else {
|
|
+ /* No token included */
|
|
+ if (maj_status != GSS_S_COMPLETE)
|
|
+ sshpkt_disconnect(ssh, "Protocol error: did not receive final token");
|
|
+ }
|
|
+ if ((r = sshpkt_get_end(ssh)) != 0) {
|
|
+ fatal("Expecting end of packet.");
|
|
+ }
|
|
+ break;
|
|
+ case SSH2_MSG_KEXGSS_ERROR:
|
|
+ debug("Received Error");
|
|
+ if ((r = sshpkt_get_u32(ssh, &maj_status)) != 0 ||
|
|
+ (r = sshpkt_get_u32(ssh, &min_status)) != 0 ||
|
|
+ (r = sshpkt_get_string(ssh, &msg, NULL)) != 0 ||
|
|
+ (r = sshpkt_get_string(ssh, NULL, NULL)) != 0 || /* lang tag */
|
|
+ (r = sshpkt_get_end(ssh)) != 0)
|
|
+ fatal("sshpkt_get failed: %s", ssh_err(r));
|
|
+ fatal("GSSAPI Error: \n%.400s", msg);
|
|
+ default:
|
|
+ sshpkt_disconnect(ssh, "Protocol error: didn't expect packet type %d",
|
|
+ type);
|
|
+ }
|
|
+ token_ptr = &recv_tok;
|
|
+ } else {
|
|
+ /* No data, and not complete */
|
|
+ if (maj_status != GSS_S_COMPLETE)
|
|
+ fatal("Not complete, and no token output");
|
|
+ }
|
|
+ } while (maj_status & GSS_S_CONTINUE_NEEDED);
|
|
+
|
|
+ /*
|
|
+ * We _must_ have received a COMPLETE message in reply from the
|
|
+ * server, which will have set server_blob and msg_tok
|
|
+ */
|
|
+
|
|
+ if (type != SSH2_MSG_KEXGSS_COMPLETE)
|
|
+ fatal("Didn't receive a SSH2_MSG_KEXGSS_COMPLETE when I expected it");
|
|
+
|
|
+ /* compute shared secret */
|
|
+ switch (kex->kex_type) {
|
|
+ case KEX_GSS_GRP1_SHA1:
|
|
+ case KEX_GSS_GRP14_SHA1:
|
|
+ case KEX_GSS_GRP14_SHA256:
|
|
+ case KEX_GSS_GRP16_SHA512:
|
|
+ r = kex_dh_dec(kex, server_blob, &shared_secret);
|
|
+ break;
|
|
+ case KEX_GSS_C25519_SHA256:
|
|
+ if (sshbuf_ptr(server_blob)[sshbuf_len(server_blob)] & 0x80)
|
|
+ fatal("The received key has MSB of last octet set!");
|
|
+ r = kex_c25519_dec(kex, server_blob, &shared_secret);
|
|
+ break;
|
|
+ case KEX_GSS_NISTP256_SHA256:
|
|
+ if (sshbuf_len(server_blob) != 65)
|
|
+ fatal("The received NIST-P256 key did not match"
|
|
+ "expected length (expected 65, got %zu)", sshbuf_len(server_blob));
|
|
+
|
|
+ if (sshbuf_ptr(server_blob)[0] != POINT_CONVERSION_UNCOMPRESSED)
|
|
+ fatal("The received NIST-P256 key does not have first octet 0x04");
|
|
+
|
|
+ r = kex_ecdh_dec(kex, server_blob, &shared_secret);
|
|
+ break;
|
|
+ default:
|
|
+ r = SSH_ERR_INVALID_ARGUMENT;
|
|
+ break;
|
|
+ }
|
|
+ if (r != 0)
|
|
+ goto out;
|
|
+
|
|
+ if ((empty = sshbuf_new()) == NULL) {
|
|
+ r = SSH_ERR_ALLOC_FAIL;
|
|
+ goto out;
|
|
+ }
|
|
+
|
|
+ hashlen = sizeof(hash);
|
|
+ if ((r = kex_gen_hash(
|
|
+ kex->hash_alg,
|
|
+ kex->client_version,
|
|
+ kex->server_version,
|
|
+ kex->my,
|
|
+ kex->peer,
|
|
+ (server_host_key_blob ? server_host_key_blob : empty),
|
|
+ kex->client_pub,
|
|
+ server_blob,
|
|
+ shared_secret,
|
|
+ hash, &hashlen)) != 0)
|
|
+ fatal("%s: Unexpected KEX type %d", __func__, kex->kex_type);
|
|
+
|
|
+ gssbuf.value = hash;
|
|
+ gssbuf.length = hashlen;
|
|
+
|
|
+ /* Verify that the hash matches the MIC we just got. */
|
|
+ if (GSS_ERROR(ssh_gssapi_checkmic(ctxt, &gssbuf, &msg_tok)))
|
|
+ sshpkt_disconnect(ssh, "Hash's MIC didn't verify");
|
|
+
|
|
+ gss_release_buffer(&min_status, &msg_tok);
|
|
+
|
|
+ if (kex->gss_deleg_creds)
|
|
+ ssh_gssapi_credentials_updated(ctxt);
|
|
+
|
|
+ if (gss_kex_context == NULL)
|
|
+ gss_kex_context = ctxt;
|
|
+ else
|
|
+ ssh_gssapi_delete_ctx(&ctxt);
|
|
+
|
|
+ if ((r = kex_derive_keys(ssh, hash, hashlen, shared_secret)) == 0)
|
|
+ r = kex_send_newkeys(ssh);
|
|
+
|
|
+out:
|
|
+ explicit_bzero(hash, sizeof(hash));
|
|
+ explicit_bzero(kex->c25519_client_key, sizeof(kex->c25519_client_key));
|
|
+ sshbuf_free(empty);
|
|
+ sshbuf_free(server_host_key_blob);
|
|
+ sshbuf_free(server_blob);
|
|
+ sshbuf_free(shared_secret);
|
|
+ sshbuf_free(kex->client_pub);
|
|
+ kex->client_pub = NULL;
|
|
+ return r;
|
|
+}
|
|
+
|
|
+int
|
|
+kexgssgex_client(struct ssh *ssh)
|
|
+{
|
|
+ struct kex *kex = ssh->kex;
|
|
+ gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER,
|
|
+ recv_tok = GSS_C_EMPTY_BUFFER, gssbuf,
|
|
+ msg_tok = GSS_C_EMPTY_BUFFER, *token_ptr;
|
|
+ Gssctxt *ctxt;
|
|
+ OM_uint32 maj_status, min_status, ret_flags;
|
|
+ struct sshbuf *shared_secret = NULL;
|
|
+ BIGNUM *p = NULL;
|
|
+ BIGNUM *g = NULL;
|
|
+ struct sshbuf *buf = NULL;
|
|
+ struct sshbuf *server_host_key_blob = NULL;
|
|
+ struct sshbuf *server_blob = NULL;
|
|
+ BIGNUM *dh_server_pub = NULL;
|
|
+ u_char *msg;
|
|
+ int type = 0;
|
|
+ int first = 1;
|
|
+ u_char hash[SSH_DIGEST_MAX_LENGTH];
|
|
+ size_t hashlen;
|
|
+ const BIGNUM *pub_key, *dh_p, *dh_g;
|
|
+ int nbits = 0, min = DH_GRP_MIN, max = DH_GRP_MAX;
|
|
+ struct sshbuf *empty = NULL;
|
|
+ u_char c;
|
|
+ int r;
|
|
+
|
|
+ /* Initialise our GSSAPI world */
|
|
+ ssh_gssapi_build_ctx(&ctxt);
|
|
+ if (ssh_gssapi_id_kex(ctxt, kex->name, kex->kex_type)
|
|
+ == GSS_C_NO_OID)
|
|
+ fatal("Couldn't identify host exchange");
|
|
+
|
|
+ if (ssh_gssapi_import_name(ctxt, kex->gss_host))
|
|
+ fatal("Couldn't import hostname");
|
|
+
|
|
+ if (kex->gss_client &&
|
|
+ ssh_gssapi_client_identity(ctxt, kex->gss_client))
|
|
+ fatal("Couldn't acquire client credentials");
|
|
+
|
|
+ debug("Doing group exchange");
|
|
+ nbits = dh_estimate(kex->dh_need * 8);
|
|
+
|
|
+ kex->min = DH_GRP_MIN;
|
|
+ kex->max = DH_GRP_MAX;
|
|
+ kex->nbits = nbits;
|
|
+ if ((r = sshpkt_start(ssh, SSH2_MSG_KEXGSS_GROUPREQ)) != 0 ||
|
|
+ (r = sshpkt_put_u32(ssh, min)) != 0 ||
|
|
+ (r = sshpkt_put_u32(ssh, nbits)) != 0 ||
|
|
+ (r = sshpkt_put_u32(ssh, max)) != 0 ||
|
|
+ (r = sshpkt_send(ssh)) != 0)
|
|
+ fatal("Failed to construct a packet: %s", ssh_err(r));
|
|
+
|
|
+ if ((r = ssh_packet_read_expect(ssh, SSH2_MSG_KEXGSS_GROUP)) != 0)
|
|
+ fatal("Error: %s", ssh_err(r));
|
|
+
|
|
+ if ((r = sshpkt_get_bignum2(ssh, &p)) != 0 ||
|
|
+ (r = sshpkt_get_bignum2(ssh, &g)) != 0 ||
|
|
+ (r = sshpkt_get_end(ssh)) != 0)
|
|
+ fatal("shpkt_get_bignum2 failed: %s", ssh_err(r));
|
|
+
|
|
+ if (BN_num_bits(p) < min || BN_num_bits(p) > max)
|
|
+ fatal("GSSGRP_GEX group out of range: %d !< %d !< %d",
|
|
+ min, BN_num_bits(p), max);
|
|
+
|
|
+ if ((kex->dh = dh_new_group(g, p)) == NULL)
|
|
+ fatal("dn_new_group() failed");
|
|
+ p = g = NULL; /* belong to kex->dh now */
|
|
+
|
|
+ if ((r = dh_gen_key(kex->dh, kex->we_need * 8)) != 0)
|
|
+ goto out;
|
|
+ DH_get0_key(kex->dh, &pub_key, NULL);
|
|
+
|
|
+ token_ptr = GSS_C_NO_BUFFER;
|
|
+
|
|
+ do {
|
|
+ /* Step 2 - call GSS_Init_sec_context() */
|
|
+ debug("Calling gss_init_sec_context");
|
|
+
|
|
+ maj_status = ssh_gssapi_init_ctx(ctxt,
|
|
+ kex->gss_deleg_creds, token_ptr, &send_tok,
|
|
+ &ret_flags);
|
|
+
|
|
+ if (GSS_ERROR(maj_status)) {
|
|
+ /* XXX Useles code: Missing send? */
|
|
+ if (send_tok.length != 0) {
|
|
+ if ((r = sshpkt_start(ssh,
|
|
+ SSH2_MSG_KEXGSS_CONTINUE)) != 0 ||
|
|
+ (r = sshpkt_put_string(ssh, send_tok.value,
|
|
+ send_tok.length)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+ }
|
|
+ fatal("gss_init_context failed");
|
|
+ }
|
|
+
|
|
+ /* If we've got an old receive buffer get rid of it */
|
|
+ if (token_ptr != GSS_C_NO_BUFFER)
|
|
+ gss_release_buffer(&min_status, &recv_tok);
|
|
+
|
|
+ if (maj_status == GSS_S_COMPLETE) {
|
|
+ /* If mutual state flag is not true, kex fails */
|
|
+ if (!(ret_flags & GSS_C_MUTUAL_FLAG))
|
|
+ fatal("Mutual authentication failed");
|
|
+
|
|
+ /* If integ avail flag is not true kex fails */
|
|
+ if (!(ret_flags & GSS_C_INTEG_FLAG))
|
|
+ fatal("Integrity check failed");
|
|
+ }
|
|
+
|
|
+ /*
|
|
+ * If we have data to send, then the last message that we
|
|
+ * received cannot have been a 'complete'.
|
|
+ */
|
|
+ if (send_tok.length != 0) {
|
|
+ if (first) {
|
|
+ if ((r = sshpkt_start(ssh, SSH2_MSG_KEXGSS_INIT)) != 0 ||
|
|
+ (r = sshpkt_put_string(ssh, send_tok.value,
|
|
+ send_tok.length)) != 0 ||
|
|
+ (r = sshpkt_put_bignum2(ssh, pub_key)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+ first = 0;
|
|
+ } else {
|
|
+ if ((r = sshpkt_start(ssh, SSH2_MSG_KEXGSS_CONTINUE)) != 0 ||
|
|
+ (r = sshpkt_put_string(ssh,send_tok.value,
|
|
+ send_tok.length)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+ }
|
|
+ if ((r = sshpkt_send(ssh)) != 0)
|
|
+ fatal("sshpkt_send failed: %s", ssh_err(r));
|
|
+ gss_release_buffer(&min_status, &send_tok);
|
|
+
|
|
+ /* If we've sent them data, they should reply */
|
|
+ do {
|
|
+ type = ssh_packet_read(ssh);
|
|
+ if (type == SSH2_MSG_KEXGSS_HOSTKEY) {
|
|
+ debug("Received KEXGSS_HOSTKEY");
|
|
+ if (server_host_key_blob)
|
|
+ fatal("Server host key received more than once");
|
|
+ if ((r = sshpkt_getb_froms(ssh, &server_host_key_blob)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+ }
|
|
+ } while (type == SSH2_MSG_KEXGSS_HOSTKEY);
|
|
+
|
|
+ switch (type) {
|
|
+ case SSH2_MSG_KEXGSS_CONTINUE:
|
|
+ debug("Received GSSAPI_CONTINUE");
|
|
+ if (maj_status == GSS_S_COMPLETE)
|
|
+ fatal("GSSAPI Continue received from server when complete");
|
|
+ if ((r = ssh_gssapi_sshpkt_get_buffer_desc(ssh,
|
|
+ &recv_tok)) != 0 ||
|
|
+ (r = sshpkt_get_end(ssh)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+ break;
|
|
+ case SSH2_MSG_KEXGSS_COMPLETE:
|
|
+ debug("Received GSSAPI_COMPLETE");
|
|
+ if (msg_tok.value != NULL)
|
|
+ fatal("Received GSSAPI_COMPLETE twice?");
|
|
+ if ((r = sshpkt_getb_froms(ssh, &server_blob)) != 0 ||
|
|
+ (r = ssh_gssapi_sshpkt_get_buffer_desc(ssh,
|
|
+ &msg_tok)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+
|
|
+ /* Is there a token included? */
|
|
+ if ((r = sshpkt_get_u8(ssh, &c)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+ if (c) {
|
|
+ if ((r = ssh_gssapi_sshpkt_get_buffer_desc(
|
|
+ ssh, &recv_tok)) != 0 ||
|
|
+ (r = sshpkt_get_end(ssh)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+ /* If we're already complete - protocol error */
|
|
+ if (maj_status == GSS_S_COMPLETE)
|
|
+ sshpkt_disconnect(ssh, "Protocol error: received token when complete");
|
|
+ } else {
|
|
+ /* No token included */
|
|
+ if (maj_status != GSS_S_COMPLETE)
|
|
+ sshpkt_disconnect(ssh, "Protocol error: did not receive final token");
|
|
+ }
|
|
+ break;
|
|
+ case SSH2_MSG_KEXGSS_ERROR:
|
|
+ debug("Received Error");
|
|
+ if ((r = sshpkt_get_u32(ssh, &maj_status)) != 0 ||
|
|
+ (r = sshpkt_get_u32(ssh, &min_status)) != 0 ||
|
|
+ (r = sshpkt_get_string(ssh, &msg, NULL)) != 0 ||
|
|
+ (r = sshpkt_get_string(ssh, NULL, NULL)) != 0 || /* lang tag */
|
|
+ (r = sshpkt_get_end(ssh)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+ fatal("GSSAPI Error: \n%.400s", msg);
|
|
+ default:
|
|
+ sshpkt_disconnect(ssh, "Protocol error: didn't expect packet type %d",
|
|
+ type);
|
|
+ }
|
|
+ token_ptr = &recv_tok;
|
|
+ } else {
|
|
+ /* No data, and not complete */
|
|
+ if (maj_status != GSS_S_COMPLETE)
|
|
+ fatal("Not complete, and no token output");
|
|
+ }
|
|
+ } while (maj_status & GSS_S_CONTINUE_NEEDED);
|
|
+
|
|
+ /*
|
|
+ * We _must_ have received a COMPLETE message in reply from the
|
|
+ * server, which will have set dh_server_pub and msg_tok
|
|
+ */
|
|
+
|
|
+ if (type != SSH2_MSG_KEXGSS_COMPLETE)
|
|
+ fatal("Didn't receive a SSH2_MSG_KEXGSS_COMPLETE when I expected it");
|
|
+
|
|
+ /* 7. C verifies that the key Q_S is valid */
|
|
+ /* 8. C computes shared secret */
|
|
+ if ((buf = sshbuf_new()) == NULL ||
|
|
+ (r = sshbuf_put_stringb(buf, server_blob)) != 0 ||
|
|
+ (r = sshbuf_get_bignum2(buf, &dh_server_pub)) != 0)
|
|
+ goto out;
|
|
+ sshbuf_free(buf);
|
|
+ buf = NULL;
|
|
+
|
|
+ if ((shared_secret = sshbuf_new()) == NULL) {
|
|
+ r = SSH_ERR_ALLOC_FAIL;
|
|
+ goto out;
|
|
+ }
|
|
+
|
|
+ if ((r = kex_dh_compute_key(kex, dh_server_pub, shared_secret)) != 0)
|
|
+ goto out;
|
|
+ if ((empty = sshbuf_new()) == NULL) {
|
|
+ r = SSH_ERR_ALLOC_FAIL;
|
|
+ goto out;
|
|
+ }
|
|
+
|
|
+ DH_get0_pqg(kex->dh, &dh_p, NULL, &dh_g);
|
|
+ hashlen = sizeof(hash);
|
|
+ if ((r = kexgex_hash(
|
|
+ kex->hash_alg,
|
|
+ kex->client_version,
|
|
+ kex->server_version,
|
|
+ kex->my,
|
|
+ kex->peer,
|
|
+ (server_host_key_blob ? server_host_key_blob : empty),
|
|
+ kex->min, kex->nbits, kex->max,
|
|
+ dh_p, dh_g,
|
|
+ pub_key,
|
|
+ dh_server_pub,
|
|
+ sshbuf_ptr(shared_secret), sshbuf_len(shared_secret),
|
|
+ hash, &hashlen)) != 0)
|
|
+ fatal("Failed to calculate hash: %s", ssh_err(r));
|
|
+
|
|
+ gssbuf.value = hash;
|
|
+ gssbuf.length = hashlen;
|
|
+
|
|
+ /* Verify that the hash matches the MIC we just got. */
|
|
+ if (GSS_ERROR(ssh_gssapi_checkmic(ctxt, &gssbuf, &msg_tok)))
|
|
+ sshpkt_disconnect(ssh, "Hash's MIC didn't verify");
|
|
+
|
|
+ gss_release_buffer(&min_status, &msg_tok);
|
|
+
|
|
+ /* save session id */
|
|
+ if (kex->session_id == NULL) {
|
|
+ kex->session_id_len = hashlen;
|
|
+ kex->session_id = xmalloc(kex->session_id_len);
|
|
+ memcpy(kex->session_id, hash, kex->session_id_len);
|
|
+ }
|
|
+
|
|
+ if (kex->gss_deleg_creds)
|
|
+ ssh_gssapi_credentials_updated(ctxt);
|
|
+
|
|
+ if (gss_kex_context == NULL)
|
|
+ gss_kex_context = ctxt;
|
|
+ else
|
|
+ ssh_gssapi_delete_ctx(&ctxt);
|
|
+
|
|
+ /* Finally derive the keys and send them */
|
|
+ if ((r = kex_derive_keys(ssh, hash, hashlen, shared_secret)) == 0)
|
|
+ r = kex_send_newkeys(ssh);
|
|
+out:
|
|
+ sshbuf_free(buf);
|
|
+ sshbuf_free(server_blob);
|
|
+ sshbuf_free(empty);
|
|
+ explicit_bzero(hash, sizeof(hash));
|
|
+ DH_free(kex->dh);
|
|
+ kex->dh = NULL;
|
|
+ BN_clear_free(dh_server_pub);
|
|
+ sshbuf_free(shared_secret);
|
|
+ sshbuf_free(server_host_key_blob);
|
|
+ return r;
|
|
+}
|
|
+#endif /* defined(GSSAPI) && defined(WITH_OPENSSL) */
|
|
diff --git a/kexgsss.c b/kexgsss.c
|
|
new file mode 100644
|
|
index 00000000..60bc02de
|
|
--- /dev/null
|
|
+++ b/kexgsss.c
|
|
@@ -0,0 +1,474 @@
|
|
+/*
|
|
+ * Copyright (c) 2001-2009 Simon Wilkinson. All rights reserved.
|
|
+ *
|
|
+ * Redistribution and use in source and binary forms, with or without
|
|
+ * modification, are permitted provided that the following conditions
|
|
+ * are met:
|
|
+ * 1. Redistributions of source code must retain the above copyright
|
|
+ * notice, this list of conditions and the following disclaimer.
|
|
+ * 2. Redistributions in binary form must reproduce the above copyright
|
|
+ * notice, this list of conditions and the following disclaimer in the
|
|
+ * documentation and/or other materials provided with the distribution.
|
|
+ *
|
|
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
|
|
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
+ */
|
|
+
|
|
+#include "includes.h"
|
|
+
|
|
+#if defined(GSSAPI) && defined(WITH_OPENSSL)
|
|
+
|
|
+#include <string.h>
|
|
+
|
|
+#include <openssl/crypto.h>
|
|
+#include <openssl/bn.h>
|
|
+
|
|
+#include "xmalloc.h"
|
|
+#include "sshbuf.h"
|
|
+#include "ssh2.h"
|
|
+#include "sshkey.h"
|
|
+#include "cipher.h"
|
|
+#include "kex.h"
|
|
+#include "log.h"
|
|
+#include "packet.h"
|
|
+#include "dh.h"
|
|
+#include "ssh-gss.h"
|
|
+#include "monitor_wrap.h"
|
|
+#include "misc.h" /* servconf.h needs misc.h for struct ForwardOptions */
|
|
+#include "servconf.h"
|
|
+#include "ssh-gss.h"
|
|
+#include "digest.h"
|
|
+#include "ssherr.h"
|
|
+
|
|
+extern ServerOptions options;
|
|
+
|
|
+int
|
|
+kexgss_server(struct ssh *ssh)
|
|
+{
|
|
+ struct kex *kex = ssh->kex;
|
|
+ OM_uint32 maj_status, min_status;
|
|
+
|
|
+ /*
|
|
+ * Some GSSAPI implementations use the input value of ret_flags (an
|
|
+ * output variable) as a means of triggering mechanism specific
|
|
+ * features. Initializing it to zero avoids inadvertently
|
|
+ * activating this non-standard behaviour.
|
|
+ */
|
|
+
|
|
+ OM_uint32 ret_flags = 0;
|
|
+ gss_buffer_desc gssbuf, recv_tok, msg_tok;
|
|
+ gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
|
|
+ Gssctxt *ctxt = NULL;
|
|
+ struct sshbuf *shared_secret = NULL;
|
|
+ struct sshbuf *client_pubkey = NULL;
|
|
+ struct sshbuf *server_pubkey = NULL;
|
|
+ struct sshbuf *empty = sshbuf_new();
|
|
+ int type = 0;
|
|
+ gss_OID oid;
|
|
+ char *mechs;
|
|
+ u_char hash[SSH_DIGEST_MAX_LENGTH];
|
|
+ size_t hashlen;
|
|
+ int r;
|
|
+
|
|
+ /* Initialise GSSAPI */
|
|
+
|
|
+ /* If we're rekeying, privsep means that some of the private structures
|
|
+ * in the GSSAPI code are no longer available. This kludges them back
|
|
+ * into life
|
|
+ */
|
|
+ if (!ssh_gssapi_oid_table_ok()) {
|
|
+ mechs = ssh_gssapi_server_mechanisms();
|
|
+ free(mechs);
|
|
+ }
|
|
+
|
|
+ debug2("%s: Identifying %s", __func__, kex->name);
|
|
+ oid = ssh_gssapi_id_kex(NULL, kex->name, kex->kex_type);
|
|
+ if (oid == GSS_C_NO_OID)
|
|
+ fatal("Unknown gssapi mechanism");
|
|
+
|
|
+ debug2("%s: Acquiring credentials", __func__);
|
|
+
|
|
+ if (GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctxt, oid))))
|
|
+ fatal("Unable to acquire credentials for the server");
|
|
+
|
|
+ do {
|
|
+ debug("Wait SSH2_MSG_KEXGSS_INIT");
|
|
+ type = ssh_packet_read(ssh);
|
|
+ switch(type) {
|
|
+ case SSH2_MSG_KEXGSS_INIT:
|
|
+ if (client_pubkey != NULL)
|
|
+ fatal("Received KEXGSS_INIT after initialising");
|
|
+ if ((r = ssh_gssapi_sshpkt_get_buffer_desc(ssh,
|
|
+ &recv_tok)) != 0 ||
|
|
+ (r = sshpkt_getb_froms(ssh, &client_pubkey)) != 0 ||
|
|
+ (r = sshpkt_get_end(ssh)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+
|
|
+ switch (kex->kex_type) {
|
|
+ case KEX_GSS_GRP1_SHA1:
|
|
+ case KEX_GSS_GRP14_SHA1:
|
|
+ case KEX_GSS_GRP14_SHA256:
|
|
+ case KEX_GSS_GRP16_SHA512:
|
|
+ r = kex_dh_enc(kex, client_pubkey, &server_pubkey,
|
|
+ &shared_secret);
|
|
+ break;
|
|
+ case KEX_GSS_NISTP256_SHA256:
|
|
+ r = kex_ecdh_enc(kex, client_pubkey, &server_pubkey,
|
|
+ &shared_secret);
|
|
+ break;
|
|
+ case KEX_GSS_C25519_SHA256:
|
|
+ r = kex_c25519_enc(kex, client_pubkey, &server_pubkey,
|
|
+ &shared_secret);
|
|
+ break;
|
|
+ default:
|
|
+ fatal("%s: Unexpected KEX type %d", __func__, kex->kex_type);
|
|
+ }
|
|
+ if (r != 0)
|
|
+ goto out;
|
|
+
|
|
+ /* Send SSH_MSG_KEXGSS_HOSTKEY here, if we want */
|
|
+ break;
|
|
+ case SSH2_MSG_KEXGSS_CONTINUE:
|
|
+ if ((r = ssh_gssapi_sshpkt_get_buffer_desc(ssh,
|
|
+ &recv_tok)) != 0 ||
|
|
+ (r = sshpkt_get_end(ssh)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+ break;
|
|
+ default:
|
|
+ sshpkt_disconnect(ssh,
|
|
+ "Protocol error: didn't expect packet type %d",
|
|
+ type);
|
|
+ }
|
|
+
|
|
+ maj_status = PRIVSEP(ssh_gssapi_accept_ctx(ctxt, &recv_tok,
|
|
+ &send_tok, &ret_flags));
|
|
+
|
|
+ gss_release_buffer(&min_status, &recv_tok);
|
|
+
|
|
+ if (maj_status != GSS_S_COMPLETE && send_tok.length == 0)
|
|
+ fatal("Zero length token output when incomplete");
|
|
+
|
|
+ if (client_pubkey == NULL)
|
|
+ fatal("No client public key");
|
|
+
|
|
+ if (maj_status & GSS_S_CONTINUE_NEEDED) {
|
|
+ debug("Sending GSSAPI_CONTINUE");
|
|
+ if ((r = sshpkt_start(ssh, SSH2_MSG_KEXGSS_CONTINUE)) != 0 ||
|
|
+ (r = sshpkt_put_string(ssh, send_tok.value, send_tok.length)) != 0 ||
|
|
+ (r = sshpkt_send(ssh)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+ gss_release_buffer(&min_status, &send_tok);
|
|
+ }
|
|
+ } while (maj_status & GSS_S_CONTINUE_NEEDED);
|
|
+
|
|
+ if (GSS_ERROR(maj_status)) {
|
|
+ if (send_tok.length > 0) {
|
|
+ if ((r = sshpkt_start(ssh, SSH2_MSG_KEXGSS_CONTINUE)) != 0 ||
|
|
+ (r = sshpkt_put_string(ssh, send_tok.value, send_tok.length)) != 0 ||
|
|
+ (r = sshpkt_send(ssh)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+ }
|
|
+ fatal("accept_ctx died");
|
|
+ }
|
|
+
|
|
+ if (!(ret_flags & GSS_C_MUTUAL_FLAG))
|
|
+ fatal("Mutual Authentication flag wasn't set");
|
|
+
|
|
+ if (!(ret_flags & GSS_C_INTEG_FLAG))
|
|
+ fatal("Integrity flag wasn't set");
|
|
+
|
|
+ hashlen = sizeof(hash);
|
|
+ if ((r = kex_gen_hash(
|
|
+ kex->hash_alg,
|
|
+ kex->client_version,
|
|
+ kex->server_version,
|
|
+ kex->peer,
|
|
+ kex->my,
|
|
+ empty,
|
|
+ client_pubkey,
|
|
+ server_pubkey,
|
|
+ shared_secret,
|
|
+ hash, &hashlen)) != 0)
|
|
+ goto out;
|
|
+
|
|
+ gssbuf.value = hash;
|
|
+ gssbuf.length = hashlen;
|
|
+
|
|
+ if (GSS_ERROR(PRIVSEP(ssh_gssapi_sign(ctxt, &gssbuf, &msg_tok))))
|
|
+ fatal("Couldn't get MIC");
|
|
+
|
|
+ if ((r = sshpkt_start(ssh, SSH2_MSG_KEXGSS_COMPLETE)) != 0 ||
|
|
+ (r = sshpkt_put_stringb(ssh, server_pubkey)) != 0 ||
|
|
+ (r = sshpkt_put_string(ssh, msg_tok.value, msg_tok.length)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+
|
|
+ if (send_tok.length != 0) {
|
|
+ if ((r = sshpkt_put_u8(ssh, 1)) != 0 || /* true */
|
|
+ (r = sshpkt_put_string(ssh, send_tok.value, send_tok.length)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+ } else {
|
|
+ if ((r = sshpkt_put_u8(ssh, 0)) != 0) /* false */
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+ }
|
|
+ if ((r = sshpkt_send(ssh)) != 0)
|
|
+ fatal("sshpkt_send failed: %s", ssh_err(r));
|
|
+
|
|
+ gss_release_buffer(&min_status, &send_tok);
|
|
+ gss_release_buffer(&min_status, &msg_tok);
|
|
+
|
|
+ if (gss_kex_context == NULL)
|
|
+ gss_kex_context = ctxt;
|
|
+ else
|
|
+ ssh_gssapi_delete_ctx(&ctxt);
|
|
+
|
|
+ if ((r = kex_derive_keys(ssh, hash, hashlen, shared_secret)) == 0)
|
|
+ r = kex_send_newkeys(ssh);
|
|
+
|
|
+ /* If this was a rekey, then save out any delegated credentials we
|
|
+ * just exchanged. */
|
|
+ if (options.gss_store_rekey)
|
|
+ ssh_gssapi_rekey_creds();
|
|
+out:
|
|
+ sshbuf_free(empty);
|
|
+ explicit_bzero(hash, sizeof(hash));
|
|
+ sshbuf_free(shared_secret);
|
|
+ sshbuf_free(client_pubkey);
|
|
+ sshbuf_free(server_pubkey);
|
|
+ return r;
|
|
+}
|
|
+
|
|
+int
|
|
+kexgssgex_server(struct ssh *ssh)
|
|
+{
|
|
+ struct kex *kex = ssh->kex;
|
|
+ OM_uint32 maj_status, min_status;
|
|
+
|
|
+ /*
|
|
+ * Some GSSAPI implementations use the input value of ret_flags (an
|
|
+ * output variable) as a means of triggering mechanism specific
|
|
+ * features. Initializing it to zero avoids inadvertently
|
|
+ * activating this non-standard behaviour.
|
|
+ */
|
|
+
|
|
+ OM_uint32 ret_flags = 0;
|
|
+ gss_buffer_desc gssbuf, recv_tok, msg_tok;
|
|
+ gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
|
|
+ Gssctxt *ctxt = NULL;
|
|
+ struct sshbuf *shared_secret = NULL;
|
|
+ int type = 0;
|
|
+ gss_OID oid;
|
|
+ char *mechs;
|
|
+ u_char hash[SSH_DIGEST_MAX_LENGTH];
|
|
+ size_t hashlen;
|
|
+ BIGNUM *dh_client_pub = NULL;
|
|
+ const BIGNUM *pub_key, *dh_p, *dh_g;
|
|
+ int min = -1, max = -1, nbits = -1;
|
|
+ int cmin = -1, cmax = -1; /* client proposal */
|
|
+ struct sshbuf *empty = sshbuf_new();
|
|
+ int r;
|
|
+
|
|
+ /* Initialise GSSAPI */
|
|
+
|
|
+ /* If we're rekeying, privsep means that some of the private structures
|
|
+ * in the GSSAPI code are no longer available. This kludges them back
|
|
+ * into life
|
|
+ */
|
|
+ if (!ssh_gssapi_oid_table_ok())
|
|
+ if ((mechs = ssh_gssapi_server_mechanisms()))
|
|
+ free(mechs);
|
|
+
|
|
+ debug2("%s: Identifying %s", __func__, kex->name);
|
|
+ oid = ssh_gssapi_id_kex(NULL, kex->name, kex->kex_type);
|
|
+ if (oid == GSS_C_NO_OID)
|
|
+ fatal("Unknown gssapi mechanism");
|
|
+
|
|
+ debug2("%s: Acquiring credentials", __func__);
|
|
+
|
|
+ if (GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctxt, oid))))
|
|
+ fatal("Unable to acquire credentials for the server");
|
|
+
|
|
+ /* 5. S generates an ephemeral key pair (do the allocations early) */
|
|
+ debug("Doing group exchange");
|
|
+ ssh_packet_read_expect(ssh, SSH2_MSG_KEXGSS_GROUPREQ);
|
|
+ /* store client proposal to provide valid signature */
|
|
+ if ((r = sshpkt_get_u32(ssh, &cmin)) != 0 ||
|
|
+ (r = sshpkt_get_u32(ssh, &nbits)) != 0 ||
|
|
+ (r = sshpkt_get_u32(ssh, &cmax)) != 0 ||
|
|
+ (r = sshpkt_get_end(ssh)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+ kex->nbits = nbits;
|
|
+ kex->min = cmin;
|
|
+ kex->max = cmax;
|
|
+ min = MAX(DH_GRP_MIN, cmin);
|
|
+ max = MIN(DH_GRP_MAX, cmax);
|
|
+ nbits = MAXIMUM(DH_GRP_MIN, nbits);
|
|
+ nbits = MINIMUM(DH_GRP_MAX, nbits);
|
|
+ if (max < min || nbits < min || max < nbits)
|
|
+ fatal("GSS_GEX, bad parameters: %d !< %d !< %d",
|
|
+ min, nbits, max);
|
|
+ kex->dh = PRIVSEP(choose_dh(min, nbits, max));
|
|
+ if (kex->dh == NULL) {
|
|
+ sshpkt_disconnect(ssh, "Protocol error: no matching group found");
|
|
+ fatal("Protocol error: no matching group found");
|
|
+ }
|
|
+
|
|
+ DH_get0_pqg(kex->dh, &dh_p, NULL, &dh_g);
|
|
+ if ((r = sshpkt_start(ssh, SSH2_MSG_KEXGSS_GROUP)) != 0 ||
|
|
+ (r = sshpkt_put_bignum2(ssh, dh_p)) != 0 ||
|
|
+ (r = sshpkt_put_bignum2(ssh, dh_g)) != 0 ||
|
|
+ (r = sshpkt_send(ssh)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+
|
|
+ if ((r = ssh_packet_write_wait(ssh)) != 0)
|
|
+ fatal("ssh_packet_write_wait: %s", ssh_err(r));
|
|
+
|
|
+ /* Compute our exchange value in parallel with the client */
|
|
+ if ((r = dh_gen_key(kex->dh, kex->we_need * 8)) != 0)
|
|
+ goto out;
|
|
+
|
|
+ do {
|
|
+ debug("Wait SSH2_MSG_GSSAPI_INIT");
|
|
+ type = ssh_packet_read(ssh);
|
|
+ switch(type) {
|
|
+ case SSH2_MSG_KEXGSS_INIT:
|
|
+ if (dh_client_pub != NULL)
|
|
+ fatal("Received KEXGSS_INIT after initialising");
|
|
+ if ((r = ssh_gssapi_sshpkt_get_buffer_desc(ssh,
|
|
+ &recv_tok)) != 0 ||
|
|
+ (r = sshpkt_get_bignum2(ssh, &dh_client_pub)) != 0 ||
|
|
+ (r = sshpkt_get_end(ssh)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+
|
|
+ /* Send SSH_MSG_KEXGSS_HOSTKEY here, if we want */
|
|
+ break;
|
|
+ case SSH2_MSG_KEXGSS_CONTINUE:
|
|
+ if ((r = ssh_gssapi_sshpkt_get_buffer_desc(ssh,
|
|
+ &recv_tok)) != 0 ||
|
|
+ (r = sshpkt_get_end(ssh)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+ break;
|
|
+ default:
|
|
+ sshpkt_disconnect(ssh,
|
|
+ "Protocol error: didn't expect packet type %d",
|
|
+ type);
|
|
+ }
|
|
+
|
|
+ maj_status = PRIVSEP(ssh_gssapi_accept_ctx(ctxt, &recv_tok,
|
|
+ &send_tok, &ret_flags));
|
|
+
|
|
+ gss_release_buffer(&min_status, &recv_tok);
|
|
+
|
|
+ if (maj_status != GSS_S_COMPLETE && send_tok.length == 0)
|
|
+ fatal("Zero length token output when incomplete");
|
|
+
|
|
+ if (dh_client_pub == NULL)
|
|
+ fatal("No client public key");
|
|
+
|
|
+ if (maj_status & GSS_S_CONTINUE_NEEDED) {
|
|
+ debug("Sending GSSAPI_CONTINUE");
|
|
+ if ((r = sshpkt_start(ssh, SSH2_MSG_KEXGSS_CONTINUE)) != 0 ||
|
|
+ (r = sshpkt_put_string(ssh, send_tok.value, send_tok.length)) != 0 ||
|
|
+ (r = sshpkt_send(ssh)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+ gss_release_buffer(&min_status, &send_tok);
|
|
+ }
|
|
+ } while (maj_status & GSS_S_CONTINUE_NEEDED);
|
|
+
|
|
+ if (GSS_ERROR(maj_status)) {
|
|
+ if (send_tok.length > 0) {
|
|
+ if ((r = sshpkt_start(ssh, SSH2_MSG_KEXGSS_CONTINUE)) != 0 ||
|
|
+ (r = sshpkt_put_string(ssh, send_tok.value, send_tok.length)) != 0 ||
|
|
+ (r = sshpkt_send(ssh)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+ }
|
|
+ fatal("accept_ctx died");
|
|
+ }
|
|
+
|
|
+ if (!(ret_flags & GSS_C_MUTUAL_FLAG))
|
|
+ fatal("Mutual Authentication flag wasn't set");
|
|
+
|
|
+ if (!(ret_flags & GSS_C_INTEG_FLAG))
|
|
+ fatal("Integrity flag wasn't set");
|
|
+
|
|
+ /* calculate shared secret */
|
|
+ if ((shared_secret = sshbuf_new()) == NULL) {
|
|
+ r = SSH_ERR_ALLOC_FAIL;
|
|
+ goto out;
|
|
+ }
|
|
+ if ((r = kex_dh_compute_key(kex, dh_client_pub, shared_secret)) != 0)
|
|
+ goto out;
|
|
+
|
|
+ DH_get0_key(kex->dh, &pub_key, NULL);
|
|
+ DH_get0_pqg(kex->dh, &dh_p, NULL, &dh_g);
|
|
+ hashlen = sizeof(hash);
|
|
+ if ((r = kexgex_hash(
|
|
+ kex->hash_alg,
|
|
+ kex->client_version,
|
|
+ kex->server_version,
|
|
+ kex->peer,
|
|
+ kex->my,
|
|
+ empty,
|
|
+ cmin, nbits, cmax,
|
|
+ dh_p, dh_g,
|
|
+ dh_client_pub,
|
|
+ pub_key,
|
|
+ sshbuf_ptr(shared_secret), sshbuf_len(shared_secret),
|
|
+ hash, &hashlen)) != 0)
|
|
+ fatal("kexgex_hash failed: %s", ssh_err(r));
|
|
+
|
|
+ gssbuf.value = hash;
|
|
+ gssbuf.length = hashlen;
|
|
+
|
|
+ if (GSS_ERROR(PRIVSEP(ssh_gssapi_sign(ctxt, &gssbuf, &msg_tok))))
|
|
+ fatal("Couldn't get MIC");
|
|
+
|
|
+ if ((r = sshpkt_start(ssh, SSH2_MSG_KEXGSS_COMPLETE)) != 0 ||
|
|
+ (r = sshpkt_put_bignum2(ssh, pub_key)) != 0 ||
|
|
+ (r = sshpkt_put_string(ssh, msg_tok.value, msg_tok.length)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+
|
|
+ if (send_tok.length != 0) {
|
|
+ if ((r = sshpkt_put_u8(ssh, 1)) != 0 || /* true */
|
|
+ (r = sshpkt_put_string(ssh, send_tok.value, send_tok.length)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+ } else {
|
|
+ if ((r = sshpkt_put_u8(ssh, 0)) != 0) /* false */
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+ }
|
|
+ if ((r = sshpkt_send(ssh)) != 0)
|
|
+ fatal("sshpkt failed: %s", ssh_err(r));
|
|
+
|
|
+ gss_release_buffer(&min_status, &send_tok);
|
|
+ gss_release_buffer(&min_status, &msg_tok);
|
|
+
|
|
+ if (gss_kex_context == NULL)
|
|
+ gss_kex_context = ctxt;
|
|
+ else
|
|
+ ssh_gssapi_delete_ctx(&ctxt);
|
|
+
|
|
+ /* Finally derive the keys and send them */
|
|
+ if ((r = kex_derive_keys(ssh, hash, hashlen, shared_secret)) == 0)
|
|
+ r = kex_send_newkeys(ssh);
|
|
+
|
|
+ /* If this was a rekey, then save out any delegated credentials we
|
|
+ * just exchanged. */
|
|
+ if (options.gss_store_rekey)
|
|
+ ssh_gssapi_rekey_creds();
|
|
+out:
|
|
+ sshbuf_free(empty);
|
|
+ explicit_bzero(hash, sizeof(hash));
|
|
+ DH_free(kex->dh);
|
|
+ kex->dh = NULL;
|
|
+ BN_clear_free(dh_client_pub);
|
|
+ sshbuf_free(shared_secret);
|
|
+ return r;
|
|
+}
|
|
+#endif /* defined(GSSAPI) && defined(WITH_OPENSSL) */
|
|
diff --git a/monitor.c b/monitor.c
|
|
index 2ce89fe9..ebf76c7f 100644
|
|
--- a/monitor.c
|
|
+++ b/monitor.c
|
|
@@ -148,6 +148,8 @@ int mm_answer_gss_setup_ctx(struct ssh *, int, struct sshbuf *);
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int mm_answer_gss_accept_ctx(struct ssh *, int, struct sshbuf *);
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int mm_answer_gss_userok(struct ssh *, int, struct sshbuf *);
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int mm_answer_gss_checkmic(struct ssh *, int, struct sshbuf *);
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+int mm_answer_gss_sign(struct ssh *, int, struct sshbuf *);
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+int mm_answer_gss_updatecreds(struct ssh *, int, struct sshbuf *);
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#endif
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#ifdef SSH_AUDIT_EVENTS
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@@ -220,11 +222,18 @@ struct mon_table mon_dispatch_proto20[] = {
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{MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
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{MONITOR_REQ_GSSUSEROK, MON_ONCE|MON_AUTHDECIDE, mm_answer_gss_userok},
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{MONITOR_REQ_GSSCHECKMIC, MON_ONCE, mm_answer_gss_checkmic},
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+ {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
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#endif
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{0, 0, NULL}
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};
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struct mon_table mon_dispatch_postauth20[] = {
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+#ifdef GSSAPI
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+ {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx},
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+ {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
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+ {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign},
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+ {MONITOR_REQ_GSSUPCREDS, 0, mm_answer_gss_updatecreds},
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+#endif
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#ifdef WITH_OPENSSL
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{MONITOR_REQ_MODULI, 0, mm_answer_moduli},
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#endif
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@@ -293,6 +302,10 @@ monitor_child_preauth(struct ssh *ssh, struct monitor *pmonitor)
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/* Permit requests for moduli and signatures */
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monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
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monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
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+#ifdef GSSAPI
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+ /* and for the GSSAPI key exchange */
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+ monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1);
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+#endif
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/* The first few requests do not require asynchronous access */
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while (!authenticated) {
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@@ -406,6 +419,10 @@ monitor_child_postauth(struct ssh *ssh, struct monitor *pmonitor)
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monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
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monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
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monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
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+#ifdef GSSAPI
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+ /* and for the GSSAPI key exchange */
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+ monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1);
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+#endif
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if (auth_opts->permit_pty_flag) {
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monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
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@@ -1713,6 +1730,17 @@ monitor_apply_keystate(struct ssh *ssh, struct monitor *pmonitor)
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# ifdef OPENSSL_HAS_ECC
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kex->kex[KEX_ECDH_SHA2] = kex_gen_server;
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# endif
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+# ifdef GSSAPI
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+ if (options.gss_keyex) {
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+ kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_server;
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+ kex->kex[KEX_GSS_GRP14_SHA1] = kexgss_server;
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+ kex->kex[KEX_GSS_GRP14_SHA256] = kexgss_server;
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+ kex->kex[KEX_GSS_GRP16_SHA512] = kexgss_server;
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+ kex->kex[KEX_GSS_GEX_SHA1] = kexgssgex_server;
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+ kex->kex[KEX_GSS_NISTP256_SHA256] = kexgss_server;
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+ kex->kex[KEX_GSS_C25519_SHA256] = kexgss_server;
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+ }
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+# endif
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#endif /* WITH_OPENSSL */
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kex->kex[KEX_C25519_SHA256] = kex_gen_server;
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kex->kex[KEX_KEM_SNTRUP4591761X25519_SHA512] = kex_gen_server;
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@@ -1806,8 +1834,8 @@ mm_answer_gss_setup_ctx(struct ssh *ssh, int sock, struct sshbuf *m)
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u_char *p;
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int r;
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- if (!options.gss_authentication)
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- fatal("%s: GSSAPI authentication not enabled", __func__);
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+ if (!options.gss_authentication && !options.gss_keyex)
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+ fatal("%s: GSSAPI not enabled", __func__);
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if ((r = sshbuf_get_string(m, &p, &len)) != 0)
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fatal("%s: buffer error: %s", __func__, ssh_err(r));
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@@ -1839,8 +1867,8 @@ mm_answer_gss_accept_ctx(struct ssh *ssh, int sock, struct sshbuf *m)
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OM_uint32 flags = 0; /* GSI needs this */
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int r;
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- if (!options.gss_authentication)
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- fatal("%s: GSSAPI authentication not enabled", __func__);
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+ if (!options.gss_authentication && !options.gss_keyex)
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+ fatal("%s: GSSAPI not enabled", __func__);
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if ((r = ssh_gssapi_get_buffer_desc(m, &in)) != 0)
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fatal("%s: buffer error: %s", __func__, ssh_err(r));
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@@ -1860,6 +1888,7 @@ mm_answer_gss_accept_ctx(struct ssh *ssh, int sock, struct sshbuf *m)
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monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
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monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
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monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
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+ monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1);
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}
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return (0);
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}
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@@ -1871,8 +1900,8 @@ mm_answer_gss_checkmic(struct ssh *ssh, int sock, struct sshbuf *m)
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OM_uint32 ret;
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int r;
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|
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- if (!options.gss_authentication)
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- fatal("%s: GSSAPI authentication not enabled", __func__);
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+ if (!options.gss_authentication && !options.gss_keyex)
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+ fatal("%s: GSSAPI not enabled", __func__);
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|
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if ((r = ssh_gssapi_get_buffer_desc(m, &gssbuf)) != 0 ||
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(r = ssh_gssapi_get_buffer_desc(m, &mic)) != 0)
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@@ -1898,13 +1927,17 @@ mm_answer_gss_checkmic(struct ssh *ssh, int sock, struct sshbuf *m)
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int
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mm_answer_gss_userok(struct ssh *ssh, int sock, struct sshbuf *m)
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{
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- int r, authenticated;
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+ int r, authenticated, kex;
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const char *displayname;
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|
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- if (!options.gss_authentication)
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- fatal("%s: GSSAPI authentication not enabled", __func__);
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+ if (!options.gss_authentication && !options.gss_keyex)
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+ fatal("%s: GSSAPI not enabled", __func__);
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|
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- authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
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+ if ((r = sshbuf_get_u32(m, &kex)) != 0)
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+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
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+
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+ authenticated = authctxt->valid &&
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+ ssh_gssapi_userok(authctxt->user, authctxt->pw, kex);
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sshbuf_reset(m);
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if ((r = sshbuf_put_u32(m, authenticated)) != 0)
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@@ -1913,7 +1946,11 @@ mm_answer_gss_userok(struct ssh *ssh, int sock, struct sshbuf *m)
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debug3("%s: sending result %d", __func__, authenticated);
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mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
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|
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|
- auth_method = "gssapi-with-mic";
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|
+ if (kex) {
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|
+ auth_method = "gssapi-keyex";
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|
+ } else {
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|
+ auth_method = "gssapi-with-mic";
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|
+ }
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|
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|
if ((displayname = ssh_gssapi_displayname()) != NULL)
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|
auth2_record_info(authctxt, "%s", displayname);
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|
@@ -1921,5 +1958,85 @@ mm_answer_gss_userok(struct ssh *ssh, int sock, struct sshbuf *m)
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/* Monitor loop will terminate if authenticated */
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|
return (authenticated);
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|
}
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|
+
|
|
+int
|
|
+mm_answer_gss_sign(struct ssh *ssh, int socket, struct sshbuf *m)
|
|
+{
|
|
+ gss_buffer_desc data;
|
|
+ gss_buffer_desc hash = GSS_C_EMPTY_BUFFER;
|
|
+ OM_uint32 major, minor;
|
|
+ size_t len;
|
|
+ u_char *p = NULL;
|
|
+ int r;
|
|
+
|
|
+ if (!options.gss_authentication && !options.gss_keyex)
|
|
+ fatal("%s: GSSAPI not enabled", __func__);
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|
+
|
|
+ if ((r = sshbuf_get_string(m, &p, &len)) != 0)
|
|
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
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|
+ data.value = p;
|
|
+ data.length = len;
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|
+ /* Lengths of SHA-1, SHA-256 and SHA-512 hashes that are used */
|
|
+ if (data.length != 20 && data.length != 32 && data.length != 64)
|
|
+ fatal("%s: data length incorrect: %d", __func__,
|
|
+ (int) data.length);
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|
+
|
|
+ /* Save the session ID on the first time around */
|
|
+ if (session_id2_len == 0) {
|
|
+ session_id2_len = data.length;
|
|
+ session_id2 = xmalloc(session_id2_len);
|
|
+ memcpy(session_id2, data.value, session_id2_len);
|
|
+ }
|
|
+ major = ssh_gssapi_sign(gsscontext, &data, &hash);
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|
+
|
|
+ free(data.value);
|
|
+
|
|
+ sshbuf_reset(m);
|
|
+
|
|
+ if ((r = sshbuf_put_u32(m, major)) != 0 ||
|
|
+ (r = sshbuf_put_string(m, hash.value, hash.length)) != 0)
|
|
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
|
|
+
|
|
+ mm_request_send(socket, MONITOR_ANS_GSSSIGN, m);
|
|
+
|
|
+ gss_release_buffer(&minor, &hash);
|
|
+
|
|
+ /* Turn on getpwnam permissions */
|
|
+ monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
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|
+
|
|
+ /* And credential updating, for when rekeying */
|
|
+ monitor_permit(mon_dispatch, MONITOR_REQ_GSSUPCREDS, 1);
|
|
+
|
|
+ return (0);
|
|
+}
|
|
+
|
|
+int
|
|
+mm_answer_gss_updatecreds(struct ssh *ssh, int socket, struct sshbuf *m) {
|
|
+ ssh_gssapi_ccache store;
|
|
+ int r, ok;
|
|
+
|
|
+ if (!options.gss_authentication && !options.gss_keyex)
|
|
+ fatal("%s: GSSAPI not enabled", __func__);
|
|
+
|
|
+ if ((r = sshbuf_get_string(m, (u_char **)&store.filename, NULL)) != 0 ||
|
|
+ (r = sshbuf_get_string(m, (u_char **)&store.envvar, NULL)) != 0 ||
|
|
+ (r = sshbuf_get_string(m, (u_char **)&store.envval, NULL)) != 0)
|
|
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
|
|
+
|
|
+ ok = ssh_gssapi_update_creds(&store);
|
|
+
|
|
+ free(store.filename);
|
|
+ free(store.envvar);
|
|
+ free(store.envval);
|
|
+
|
|
+ sshbuf_reset(m);
|
|
+ if ((r = sshbuf_put_u32(m, ok)) != 0)
|
|
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
|
|
+
|
|
+ mm_request_send(socket, MONITOR_ANS_GSSUPCREDS, m);
|
|
+
|
|
+ return(0);
|
|
+}
|
|
+
|
|
#endif /* GSSAPI */
|
|
|
|
diff --git a/monitor.h b/monitor.h
|
|
index 683e5e07..2b1a2d59 100644
|
|
--- a/monitor.h
|
|
+++ b/monitor.h
|
|
@@ -63,6 +63,8 @@ enum monitor_reqtype {
|
|
MONITOR_REQ_PAM_FREE_CTX = 110, MONITOR_ANS_PAM_FREE_CTX = 111,
|
|
MONITOR_REQ_AUDIT_EVENT = 112, MONITOR_REQ_AUDIT_COMMAND = 113,
|
|
|
|
+ MONITOR_REQ_GSSSIGN = 150, MONITOR_ANS_GSSSIGN = 151,
|
|
+ MONITOR_REQ_GSSUPCREDS = 152, MONITOR_ANS_GSSUPCREDS = 153,
|
|
};
|
|
|
|
struct ssh;
|
|
diff --git a/monitor_wrap.c b/monitor_wrap.c
|
|
index 001a8fa1..6edb509a 100644
|
|
--- a/monitor_wrap.c
|
|
+++ b/monitor_wrap.c
|
|
@@ -993,13 +993,15 @@ mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
|
|
}
|
|
|
|
int
|
|
-mm_ssh_gssapi_userok(char *user)
|
|
+mm_ssh_gssapi_userok(char *user, struct passwd *pw, int kex)
|
|
{
|
|
struct sshbuf *m;
|
|
int r, authenticated = 0;
|
|
|
|
if ((m = sshbuf_new()) == NULL)
|
|
fatal("%s: sshbuf_new failed", __func__);
|
|
+ if ((r = sshbuf_put_u32(m, kex)) != 0)
|
|
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
|
|
|
|
mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, m);
|
|
mm_request_receive_expect(pmonitor->m_recvfd,
|
|
@@ -1012,4 +1014,57 @@ mm_ssh_gssapi_userok(char *user)
|
|
debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
|
|
return (authenticated);
|
|
}
|
|
+
|
|
+OM_uint32
|
|
+mm_ssh_gssapi_sign(Gssctxt *ctx, gss_buffer_desc *data, gss_buffer_desc *hash)
|
|
+{
|
|
+ struct sshbuf *m;
|
|
+ OM_uint32 major;
|
|
+ int r;
|
|
+
|
|
+ if ((m = sshbuf_new()) == NULL)
|
|
+ fatal("%s: sshbuf_new failed", __func__);
|
|
+ if ((r = sshbuf_put_string(m, data->value, data->length)) != 0)
|
|
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
|
|
+
|
|
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSIGN, m);
|
|
+ mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSIGN, m);
|
|
+
|
|
+ if ((r = sshbuf_get_u32(m, &major)) != 0 ||
|
|
+ (r = ssh_gssapi_get_buffer_desc(m, hash)) != 0)
|
|
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
|
|
+
|
|
+ sshbuf_free(m);
|
|
+
|
|
+ return (major);
|
|
+}
|
|
+
|
|
+int
|
|
+mm_ssh_gssapi_update_creds(ssh_gssapi_ccache *store)
|
|
+{
|
|
+ struct sshbuf *m;
|
|
+ int r, ok;
|
|
+
|
|
+ if ((m = sshbuf_new()) == NULL)
|
|
+ fatal("%s: sshbuf_new failed", __func__);
|
|
+
|
|
+ if ((r = sshbuf_put_cstring(m,
|
|
+ store->filename ? store->filename : "")) != 0 ||
|
|
+ (r = sshbuf_put_cstring(m,
|
|
+ store->envvar ? store->envvar : "")) != 0 ||
|
|
+ (r = sshbuf_put_cstring(m,
|
|
+ store->envval ? store->envval : "")) != 0)
|
|
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
|
|
+
|
|
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUPCREDS, m);
|
|
+ mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUPCREDS, m);
|
|
+
|
|
+ if ((r = sshbuf_get_u32(m, &ok)) != 0)
|
|
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
|
|
+
|
|
+ sshbuf_free(m);
|
|
+
|
|
+ return (ok);
|
|
+}
|
|
+
|
|
#endif /* GSSAPI */
|
|
diff --git a/monitor_wrap.h b/monitor_wrap.h
|
|
index 23ab096a..485590c1 100644
|
|
--- a/monitor_wrap.h
|
|
+++ b/monitor_wrap.h
|
|
@@ -64,8 +64,10 @@ int mm_sshkey_verify(const struct sshkey *, const u_char *, size_t,
|
|
OM_uint32 mm_ssh_gssapi_server_ctx(Gssctxt **, gss_OID);
|
|
OM_uint32 mm_ssh_gssapi_accept_ctx(Gssctxt *,
|
|
gss_buffer_desc *, gss_buffer_desc *, OM_uint32 *);
|
|
-int mm_ssh_gssapi_userok(char *user);
|
|
+int mm_ssh_gssapi_userok(char *user, struct passwd *, int kex);
|
|
OM_uint32 mm_ssh_gssapi_checkmic(Gssctxt *, gss_buffer_t, gss_buffer_t);
|
|
+OM_uint32 mm_ssh_gssapi_sign(Gssctxt *, gss_buffer_t, gss_buffer_t);
|
|
+int mm_ssh_gssapi_update_creds(ssh_gssapi_ccache *);
|
|
#endif
|
|
|
|
#ifdef USE_PAM
|
|
diff --git a/readconf.c b/readconf.c
|
|
index f3cac6b3..da8022dd 100644
|
|
--- a/readconf.c
|
|
+++ b/readconf.c
|
|
@@ -67,6 +67,7 @@
|
|
#include "uidswap.h"
|
|
#include "myproposal.h"
|
|
#include "digest.h"
|
|
+#include "ssh-gss.h"
|
|
|
|
/* Format of the configuration file:
|
|
|
|
@@ -160,6 +161,8 @@ typedef enum {
|
|
oClearAllForwardings, oNoHostAuthenticationForLocalhost,
|
|
oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS, oConnectTimeout,
|
|
oAddressFamily, oGssAuthentication, oGssDelegateCreds,
|
|
+ oGssTrustDns, oGssKeyEx, oGssClientIdentity, oGssRenewalRekey,
|
|
+ oGssServerIdentity, oGssKexAlgorithms,
|
|
oServerAliveInterval, oServerAliveCountMax, oIdentitiesOnly,
|
|
oSendEnv, oSetEnv, oControlPath, oControlMaster, oControlPersist,
|
|
oHashKnownHosts,
|
|
@@ -204,10 +207,22 @@ static struct {
|
|
/* Sometimes-unsupported options */
|
|
#if defined(GSSAPI)
|
|
{ "gssapiauthentication", oGssAuthentication },
|
|
+ { "gssapikeyexchange", oGssKeyEx },
|
|
{ "gssapidelegatecredentials", oGssDelegateCreds },
|
|
+ { "gssapitrustdns", oGssTrustDns },
|
|
+ { "gssapiclientidentity", oGssClientIdentity },
|
|
+ { "gssapiserveridentity", oGssServerIdentity },
|
|
+ { "gssapirenewalforcesrekey", oGssRenewalRekey },
|
|
+ { "gssapikexalgorithms", oGssKexAlgorithms },
|
|
# else
|
|
{ "gssapiauthentication", oUnsupported },
|
|
+ { "gssapikeyexchange", oUnsupported },
|
|
{ "gssapidelegatecredentials", oUnsupported },
|
|
+ { "gssapitrustdns", oUnsupported },
|
|
+ { "gssapiclientidentity", oUnsupported },
|
|
+ { "gssapiserveridentity", oUnsupported },
|
|
+ { "gssapirenewalforcesrekey", oUnsupported },
|
|
+ { "gssapikexalgorithms", oUnsupported },
|
|
#endif
|
|
#ifdef ENABLE_PKCS11
|
|
{ "pkcs11provider", oPKCS11Provider },
|
|
@@ -1029,10 +1044,42 @@ parse_time:
|
|
intptr = &options->gss_authentication;
|
|
goto parse_flag;
|
|
|
|
+ case oGssKeyEx:
|
|
+ intptr = &options->gss_keyex;
|
|
+ goto parse_flag;
|
|
+
|
|
case oGssDelegateCreds:
|
|
intptr = &options->gss_deleg_creds;
|
|
goto parse_flag;
|
|
|
|
+ case oGssTrustDns:
|
|
+ intptr = &options->gss_trust_dns;
|
|
+ goto parse_flag;
|
|
+
|
|
+ case oGssClientIdentity:
|
|
+ charptr = &options->gss_client_identity;
|
|
+ goto parse_string;
|
|
+
|
|
+ case oGssServerIdentity:
|
|
+ charptr = &options->gss_server_identity;
|
|
+ goto parse_string;
|
|
+
|
|
+ case oGssRenewalRekey:
|
|
+ intptr = &options->gss_renewal_rekey;
|
|
+ goto parse_flag;
|
|
+
|
|
+ case oGssKexAlgorithms:
|
|
+ arg = strdelim(&s);
|
|
+ if (!arg || *arg == '\0')
|
|
+ fatal("%.200s line %d: Missing argument.",
|
|
+ filename, linenum);
|
|
+ if (!kex_gss_names_valid(arg))
|
|
+ fatal("%.200s line %d: Bad GSSAPI KexAlgorithms '%s'.",
|
|
+ filename, linenum, arg ? arg : "<NONE>");
|
|
+ if (*activep && options->gss_kex_algorithms == NULL)
|
|
+ options->gss_kex_algorithms = xstrdup(arg);
|
|
+ break;
|
|
+
|
|
case oBatchMode:
|
|
intptr = &options->batch_mode;
|
|
goto parse_flag;
|
|
@@ -1911,7 +1958,13 @@ initialize_options(Options * options)
|
|
options->pubkey_authentication = -1;
|
|
options->challenge_response_authentication = -1;
|
|
options->gss_authentication = -1;
|
|
+ options->gss_keyex = -1;
|
|
options->gss_deleg_creds = -1;
|
|
+ options->gss_trust_dns = -1;
|
|
+ options->gss_renewal_rekey = -1;
|
|
+ options->gss_client_identity = NULL;
|
|
+ options->gss_server_identity = NULL;
|
|
+ options->gss_kex_algorithms = NULL;
|
|
options->password_authentication = -1;
|
|
options->kbd_interactive_authentication = -1;
|
|
options->kbd_interactive_devices = NULL;
|
|
@@ -2059,8 +2112,18 @@ fill_default_options(Options * options)
|
|
options->challenge_response_authentication = 1;
|
|
if (options->gss_authentication == -1)
|
|
options->gss_authentication = 0;
|
|
+ if (options->gss_keyex == -1)
|
|
+ options->gss_keyex = 0;
|
|
if (options->gss_deleg_creds == -1)
|
|
options->gss_deleg_creds = 0;
|
|
+ if (options->gss_trust_dns == -1)
|
|
+ options->gss_trust_dns = 0;
|
|
+ if (options->gss_renewal_rekey == -1)
|
|
+ options->gss_renewal_rekey = 0;
|
|
+#ifdef GSSAPI
|
|
+ if (options->gss_kex_algorithms == NULL)
|
|
+ options->gss_kex_algorithms = strdup(GSS_KEX_DEFAULT_KEX);
|
|
+#endif
|
|
if (options->password_authentication == -1)
|
|
options->password_authentication = 1;
|
|
if (options->kbd_interactive_authentication == -1)
|
|
@@ -2702,7 +2765,14 @@ dump_client_config(Options *o, const char *host)
|
|
dump_cfg_fmtint(oGatewayPorts, o->fwd_opts.gateway_ports);
|
|
#ifdef GSSAPI
|
|
dump_cfg_fmtint(oGssAuthentication, o->gss_authentication);
|
|
+ dump_cfg_fmtint(oGssKeyEx, o->gss_keyex);
|
|
dump_cfg_fmtint(oGssDelegateCreds, o->gss_deleg_creds);
|
|
+ dump_cfg_fmtint(oGssTrustDns, o->gss_trust_dns);
|
|
+ dump_cfg_fmtint(oGssRenewalRekey, o->gss_renewal_rekey);
|
|
+ dump_cfg_string(oGssClientIdentity, o->gss_client_identity);
|
|
+ dump_cfg_string(oGssServerIdentity, o->gss_server_identity);
|
|
+ dump_cfg_string(oGssKexAlgorithms, o->gss_kex_algorithms ?
|
|
+ o->gss_kex_algorithms : GSS_KEX_DEFAULT_KEX);
|
|
#endif /* GSSAPI */
|
|
dump_cfg_fmtint(oHashKnownHosts, o->hash_known_hosts);
|
|
dump_cfg_fmtint(oHostbasedAuthentication, o->hostbased_authentication);
|
|
diff --git a/readconf.h b/readconf.h
|
|
index feedb3d2..a8a8870d 100644
|
|
--- a/readconf.h
|
|
+++ b/readconf.h
|
|
@@ -41,7 +41,13 @@ typedef struct {
|
|
int challenge_response_authentication;
|
|
/* Try S/Key or TIS, authentication. */
|
|
int gss_authentication; /* Try GSS authentication */
|
|
+ int gss_keyex; /* Try GSS key exchange */
|
|
int gss_deleg_creds; /* Delegate GSS credentials */
|
|
+ int gss_trust_dns; /* Trust DNS for GSS canonicalization */
|
|
+ int gss_renewal_rekey; /* Credential renewal forces rekey */
|
|
+ char *gss_client_identity; /* Principal to initiate GSSAPI with */
|
|
+ char *gss_server_identity; /* GSSAPI target principal */
|
|
+ char *gss_kex_algorithms; /* GSSAPI kex methods to be offered by client. */
|
|
int password_authentication; /* Try password
|
|
* authentication. */
|
|
int kbd_interactive_authentication; /* Try keyboard-interactive auth. */
|
|
diff --git a/servconf.c b/servconf.c
|
|
index 70f5f73f..191575a1 100644
|
|
--- a/servconf.c
|
|
+++ b/servconf.c
|
|
@@ -69,6 +69,7 @@
|
|
#include "auth.h"
|
|
#include "myproposal.h"
|
|
#include "digest.h"
|
|
+#include "ssh-gss.h"
|
|
|
|
static void add_listen_addr(ServerOptions *, const char *,
|
|
const char *, int);
|
|
@@ -133,8 +134,11 @@ initialize_server_options(ServerOptions *options)
|
|
options->kerberos_ticket_cleanup = -1;
|
|
options->kerberos_get_afs_token = -1;
|
|
options->gss_authentication=-1;
|
|
+ options->gss_keyex = -1;
|
|
options->gss_cleanup_creds = -1;
|
|
options->gss_strict_acceptor = -1;
|
|
+ options->gss_store_rekey = -1;
|
|
+ options->gss_kex_algorithms = NULL;
|
|
options->password_authentication = -1;
|
|
options->kbd_interactive_authentication = -1;
|
|
options->challenge_response_authentication = -1;
|
|
@@ -375,10 +379,18 @@ fill_default_server_options(ServerOptions *options)
|
|
options->kerberos_get_afs_token = 0;
|
|
if (options->gss_authentication == -1)
|
|
options->gss_authentication = 0;
|
|
+ if (options->gss_keyex == -1)
|
|
+ options->gss_keyex = 0;
|
|
if (options->gss_cleanup_creds == -1)
|
|
options->gss_cleanup_creds = 1;
|
|
if (options->gss_strict_acceptor == -1)
|
|
options->gss_strict_acceptor = 1;
|
|
+ if (options->gss_store_rekey == -1)
|
|
+ options->gss_store_rekey = 0;
|
|
+#ifdef GSSAPI
|
|
+ if (options->gss_kex_algorithms == NULL)
|
|
+ options->gss_kex_algorithms = strdup(GSS_KEX_DEFAULT_KEX);
|
|
+#endif
|
|
if (options->password_authentication == -1)
|
|
options->password_authentication = 1;
|
|
if (options->kbd_interactive_authentication == -1)
|
|
@@ -531,6 +543,7 @@ typedef enum {
|
|
sHostKeyAlgorithms,
|
|
sClientAliveInterval, sClientAliveCountMax, sAuthorizedKeysFile,
|
|
sGssAuthentication, sGssCleanupCreds, sGssStrictAcceptor,
|
|
+ sGssKeyEx, sGssKexAlgorithms, sGssStoreRekey,
|
|
sAcceptEnv, sSetEnv, sPermitTunnel,
|
|
sMatch, sPermitOpen, sPermitListen, sForceCommand, sChrootDirectory,
|
|
sUsePrivilegeSeparation, sAllowAgentForwarding,
|
|
@@ -607,12 +620,22 @@ static struct {
|
|
#ifdef GSSAPI
|
|
{ "gssapiauthentication", sGssAuthentication, SSHCFG_ALL },
|
|
{ "gssapicleanupcredentials", sGssCleanupCreds, SSHCFG_GLOBAL },
|
|
+ { "gssapicleanupcreds", sGssCleanupCreds, SSHCFG_GLOBAL },
|
|
{ "gssapistrictacceptorcheck", sGssStrictAcceptor, SSHCFG_GLOBAL },
|
|
+ { "gssapikeyexchange", sGssKeyEx, SSHCFG_GLOBAL },
|
|
+ { "gssapistorecredentialsonrekey", sGssStoreRekey, SSHCFG_GLOBAL },
|
|
+ { "gssapikexalgorithms", sGssKexAlgorithms, SSHCFG_GLOBAL },
|
|
#else
|
|
{ "gssapiauthentication", sUnsupported, SSHCFG_ALL },
|
|
{ "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL },
|
|
+ { "gssapicleanupcreds", sUnsupported, SSHCFG_GLOBAL },
|
|
{ "gssapistrictacceptorcheck", sUnsupported, SSHCFG_GLOBAL },
|
|
+ { "gssapikeyexchange", sUnsupported, SSHCFG_GLOBAL },
|
|
+ { "gssapistorecredentialsonrekey", sUnsupported, SSHCFG_GLOBAL },
|
|
+ { "gssapikexalgorithms", sUnsupported, SSHCFG_GLOBAL },
|
|
#endif
|
|
+ { "gssusesessionccache", sUnsupported, SSHCFG_GLOBAL },
|
|
+ { "gssapiusesessioncredcache", sUnsupported, SSHCFG_GLOBAL },
|
|
{ "passwordauthentication", sPasswordAuthentication, SSHCFG_ALL },
|
|
{ "kbdinteractiveauthentication", sKbdInteractiveAuthentication, SSHCFG_ALL },
|
|
{ "challengeresponseauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL },
|
|
@@ -1548,6 +1571,10 @@ process_server_config_line_depth(ServerOptions *options, char *line,
|
|
intptr = &options->gss_authentication;
|
|
goto parse_flag;
|
|
|
|
+ case sGssKeyEx:
|
|
+ intptr = &options->gss_keyex;
|
|
+ goto parse_flag;
|
|
+
|
|
case sGssCleanupCreds:
|
|
intptr = &options->gss_cleanup_creds;
|
|
goto parse_flag;
|
|
@@ -1556,6 +1583,22 @@ process_server_config_line_depth(ServerOptions *options, char *line,
|
|
intptr = &options->gss_strict_acceptor;
|
|
goto parse_flag;
|
|
|
|
+ case sGssStoreRekey:
|
|
+ intptr = &options->gss_store_rekey;
|
|
+ goto parse_flag;
|
|
+
|
|
+ case sGssKexAlgorithms:
|
|
+ arg = strdelim(&cp);
|
|
+ if (!arg || *arg == '\0')
|
|
+ fatal("%.200s line %d: Missing argument.",
|
|
+ filename, linenum);
|
|
+ if (!kex_gss_names_valid(arg))
|
|
+ fatal("%.200s line %d: Bad GSSAPI KexAlgorithms '%s'.",
|
|
+ filename, linenum, arg ? arg : "<NONE>");
|
|
+ if (*activep && options->gss_kex_algorithms == NULL)
|
|
+ options->gss_kex_algorithms = xstrdup(arg);
|
|
+ break;
|
|
+
|
|
case sPasswordAuthentication:
|
|
intptr = &options->password_authentication;
|
|
goto parse_flag;
|
|
@@ -2777,6 +2820,10 @@ dump_config(ServerOptions *o)
|
|
#ifdef GSSAPI
|
|
dump_cfg_fmtint(sGssAuthentication, o->gss_authentication);
|
|
dump_cfg_fmtint(sGssCleanupCreds, o->gss_cleanup_creds);
|
|
+ dump_cfg_fmtint(sGssKeyEx, o->gss_keyex);
|
|
+ dump_cfg_fmtint(sGssStrictAcceptor, o->gss_strict_acceptor);
|
|
+ dump_cfg_fmtint(sGssStoreRekey, o->gss_store_rekey);
|
|
+ dump_cfg_string(sGssKexAlgorithms, o->gss_kex_algorithms);
|
|
#endif
|
|
dump_cfg_fmtint(sPasswordAuthentication, o->password_authentication);
|
|
dump_cfg_fmtint(sKbdInteractiveAuthentication,
|
|
diff --git a/servconf.h b/servconf.h
|
|
index 4202a2d0..3f47ea25 100644
|
|
--- a/servconf.h
|
|
+++ b/servconf.h
|
|
@@ -132,8 +132,11 @@ typedef struct {
|
|
int kerberos_get_afs_token; /* If true, try to get AFS token if
|
|
* authenticated with Kerberos. */
|
|
int gss_authentication; /* If true, permit GSSAPI authentication */
|
|
+ int gss_keyex; /* If true, permit GSSAPI key exchange */
|
|
int gss_cleanup_creds; /* If true, destroy cred cache on logout */
|
|
int gss_strict_acceptor; /* If true, restrict the GSSAPI acceptor name */
|
|
+ int gss_store_rekey;
|
|
+ char *gss_kex_algorithms; /* GSSAPI kex methods to be offered by client. */
|
|
int password_authentication; /* If true, permit password
|
|
* authentication. */
|
|
int kbd_interactive_authentication; /* If true, permit */
|
|
diff --git a/session.c b/session.c
|
|
index 8c0e54f7..06a33442 100644
|
|
--- a/session.c
|
|
+++ b/session.c
|
|
@@ -2678,13 +2678,19 @@ do_cleanup(struct ssh *ssh, Authctxt *authctxt)
|
|
|
|
#ifdef KRB5
|
|
if (options.kerberos_ticket_cleanup &&
|
|
- authctxt->krb5_ctx)
|
|
+ authctxt->krb5_ctx) {
|
|
+ temporarily_use_uid(authctxt->pw);
|
|
krb5_cleanup_proc(authctxt);
|
|
+ restore_uid();
|
|
+ }
|
|
#endif
|
|
|
|
#ifdef GSSAPI
|
|
- if (options.gss_cleanup_creds)
|
|
+ if (options.gss_cleanup_creds) {
|
|
+ temporarily_use_uid(authctxt->pw);
|
|
ssh_gssapi_cleanup_creds();
|
|
+ restore_uid();
|
|
+ }
|
|
#endif
|
|
|
|
/* remove agent socket */
|
|
diff --git a/ssh-gss.h b/ssh-gss.h
|
|
index 36180d07..70dd3665 100644
|
|
--- a/ssh-gss.h
|
|
+++ b/ssh-gss.h
|
|
@@ -1,6 +1,6 @@
|
|
/* $OpenBSD: ssh-gss.h,v 1.14 2018/07/10 09:13:30 djm Exp $ */
|
|
/*
|
|
- * Copyright (c) 2001-2003 Simon Wilkinson. All rights reserved.
|
|
+ * Copyright (c) 2001-2009 Simon Wilkinson. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
@@ -61,10 +61,30 @@
|
|
|
|
#define SSH_GSS_OIDTYPE 0x06
|
|
|
|
+#define SSH2_MSG_KEXGSS_INIT 30
|
|
+#define SSH2_MSG_KEXGSS_CONTINUE 31
|
|
+#define SSH2_MSG_KEXGSS_COMPLETE 32
|
|
+#define SSH2_MSG_KEXGSS_HOSTKEY 33
|
|
+#define SSH2_MSG_KEXGSS_ERROR 34
|
|
+#define SSH2_MSG_KEXGSS_GROUPREQ 40
|
|
+#define SSH2_MSG_KEXGSS_GROUP 41
|
|
+#define KEX_GSS_GRP1_SHA1_ID "gss-group1-sha1-"
|
|
+#define KEX_GSS_GRP14_SHA1_ID "gss-group14-sha1-"
|
|
+#define KEX_GSS_GRP14_SHA256_ID "gss-group14-sha256-"
|
|
+#define KEX_GSS_GRP16_SHA512_ID "gss-group16-sha512-"
|
|
+#define KEX_GSS_GEX_SHA1_ID "gss-gex-sha1-"
|
|
+#define KEX_GSS_NISTP256_SHA256_ID "gss-nistp256-sha256-"
|
|
+#define KEX_GSS_C25519_SHA256_ID "gss-curve25519-sha256-"
|
|
+
|
|
+#define GSS_KEX_DEFAULT_KEX \
|
|
+ KEX_GSS_GEX_SHA1_ID "," \
|
|
+ KEX_GSS_GRP14_SHA1_ID
|
|
+
|
|
typedef struct {
|
|
char *filename;
|
|
char *envvar;
|
|
char *envval;
|
|
+ struct passwd *owner;
|
|
void *data;
|
|
} ssh_gssapi_ccache;
|
|
|
|
@@ -72,8 +92,11 @@ typedef struct {
|
|
gss_buffer_desc displayname;
|
|
gss_buffer_desc exportedname;
|
|
gss_cred_id_t creds;
|
|
+ gss_name_t name;
|
|
struct ssh_gssapi_mech_struct *mech;
|
|
ssh_gssapi_ccache store;
|
|
+ int used;
|
|
+ int updated;
|
|
} ssh_gssapi_client;
|
|
|
|
typedef struct ssh_gssapi_mech_struct {
|
|
@@ -84,6 +107,7 @@ typedef struct ssh_gssapi_mech_struct {
|
|
int (*userok) (ssh_gssapi_client *, char *);
|
|
int (*localname) (ssh_gssapi_client *, char **);
|
|
void (*storecreds) (ssh_gssapi_client *);
|
|
+ int (*updatecreds) (ssh_gssapi_ccache *, ssh_gssapi_client *);
|
|
} ssh_gssapi_mech;
|
|
|
|
typedef struct {
|
|
@@ -94,10 +118,11 @@ typedef struct {
|
|
gss_OID oid; /* client */
|
|
gss_cred_id_t creds; /* server */
|
|
gss_name_t client; /* server */
|
|
- gss_cred_id_t client_creds; /* server */
|
|
+ gss_cred_id_t client_creds; /* both */
|
|
} Gssctxt;
|
|
|
|
extern ssh_gssapi_mech *supported_mechs[];
|
|
+extern Gssctxt *gss_kex_context;
|
|
|
|
int ssh_gssapi_check_oid(Gssctxt *, void *, size_t);
|
|
void ssh_gssapi_set_oid_data(Gssctxt *, void *, size_t);
|
|
@@ -109,6 +134,7 @@ OM_uint32 ssh_gssapi_test_oid_supported(OM_uint32 *, gss_OID, int *);
|
|
|
|
struct sshbuf;
|
|
int ssh_gssapi_get_buffer_desc(struct sshbuf *, gss_buffer_desc *);
|
|
+int ssh_gssapi_sshpkt_get_buffer_desc(struct ssh *, gss_buffer_desc *);
|
|
|
|
OM_uint32 ssh_gssapi_import_name(Gssctxt *, const char *);
|
|
OM_uint32 ssh_gssapi_init_ctx(Gssctxt *, int,
|
|
@@ -123,17 +149,33 @@ void ssh_gssapi_delete_ctx(Gssctxt **);
|
|
OM_uint32 ssh_gssapi_sign(Gssctxt *, gss_buffer_t, gss_buffer_t);
|
|
void ssh_gssapi_buildmic(struct sshbuf *, const char *,
|
|
const char *, const char *);
|
|
-int ssh_gssapi_check_mechanism(Gssctxt **, gss_OID, const char *);
|
|
+int ssh_gssapi_check_mechanism(Gssctxt **, gss_OID, const char *, const char *);
|
|
+OM_uint32 ssh_gssapi_client_identity(Gssctxt *, const char *);
|
|
+int ssh_gssapi_credentials_updated(Gssctxt *);
|
|
|
|
/* In the server */
|
|
+typedef int ssh_gssapi_check_fn(Gssctxt **, gss_OID, const char *,
|
|
+ const char *);
|
|
+char *ssh_gssapi_client_mechanisms(const char *, const char *, const char *);
|
|
+char *ssh_gssapi_kex_mechs(gss_OID_set, ssh_gssapi_check_fn *, const char *,
|
|
+ const char *, const char *);
|
|
+gss_OID ssh_gssapi_id_kex(Gssctxt *, char *, int);
|
|
+int ssh_gssapi_server_check_mech(Gssctxt **,gss_OID, const char *,
|
|
+ const char *);
|
|
OM_uint32 ssh_gssapi_server_ctx(Gssctxt **, gss_OID);
|
|
-int ssh_gssapi_userok(char *name);
|
|
+int ssh_gssapi_userok(char *name, struct passwd *, int kex);
|
|
OM_uint32 ssh_gssapi_checkmic(Gssctxt *, gss_buffer_t, gss_buffer_t);
|
|
void ssh_gssapi_do_child(char ***, u_int *);
|
|
void ssh_gssapi_cleanup_creds(void);
|
|
void ssh_gssapi_storecreds(void);
|
|
const char *ssh_gssapi_displayname(void);
|
|
|
|
+char *ssh_gssapi_server_mechanisms(void);
|
|
+int ssh_gssapi_oid_table_ok(void);
|
|
+
|
|
+int ssh_gssapi_update_creds(ssh_gssapi_ccache *store);
|
|
+void ssh_gssapi_rekey_creds(void);
|
|
+
|
|
#endif /* GSSAPI */
|
|
|
|
#endif /* _SSH_GSS_H */
|
|
diff --git a/ssh.1 b/ssh.1
|
|
index 60de6087..db5c65bc 100644
|
|
--- a/ssh.1
|
|
+++ b/ssh.1
|
|
@@ -503,7 +503,13 @@ For full details of the options listed below, and their possible values, see
|
|
.It GatewayPorts
|
|
.It GlobalKnownHostsFile
|
|
.It GSSAPIAuthentication
|
|
+.It GSSAPIKeyExchange
|
|
+.It GSSAPIClientIdentity
|
|
.It GSSAPIDelegateCredentials
|
|
+.It GSSAPIKexAlgorithms
|
|
+.It GSSAPIRenewalForcesRekey
|
|
+.It GSSAPIServerIdentity
|
|
+.It GSSAPITrustDns
|
|
.It HashKnownHosts
|
|
.It Host
|
|
.It HostbasedAuthentication
|
|
@@ -579,6 +585,8 @@ flag),
|
|
(supported message integrity codes),
|
|
.Ar kex
|
|
(key exchange algorithms),
|
|
+.Ar kex-gss
|
|
+(GSSAPI key exchange algorithms),
|
|
.Ar key
|
|
(key types),
|
|
.Ar key-cert
|
|
diff --git a/ssh.c b/ssh.c
|
|
index 15aee569..110cf9c1 100644
|
|
--- a/ssh.c
|
|
+++ b/ssh.c
|
|
@@ -747,6 +747,8 @@ main(int ac, char **av)
|
|
else if (strcmp(optarg, "kex") == 0 ||
|
|
strcasecmp(optarg, "KexAlgorithms") == 0)
|
|
cp = kex_alg_list('\n');
|
|
+ else if (strcmp(optarg, "kex-gss") == 0)
|
|
+ cp = kex_gss_alg_list('\n');
|
|
else if (strcmp(optarg, "key") == 0)
|
|
cp = sshkey_alg_list(0, 0, 0, '\n');
|
|
else if (strcmp(optarg, "key-cert") == 0)
|
|
@@ -772,8 +774,8 @@ main(int ac, char **av)
|
|
} else if (strcmp(optarg, "help") == 0) {
|
|
cp = xstrdup(
|
|
"cipher\ncipher-auth\ncompression\nkex\n"
|
|
- "key\nkey-cert\nkey-plain\nkey-sig\nmac\n"
|
|
- "protocol-version\nsig");
|
|
+ "kex-gss\nkey\nkey-cert\nkey-plain\n"
|
|
+ "key-sig\nmac\nprotocol-version\nsig");
|
|
}
|
|
if (cp == NULL)
|
|
fatal("Unsupported query \"%s\"", optarg);
|
|
diff --git a/ssh_config b/ssh_config
|
|
index 5e8ef548..1ff999b6 100644
|
|
--- a/ssh_config
|
|
+++ b/ssh_config
|
|
@@ -24,6 +24,8 @@
|
|
# HostbasedAuthentication no
|
|
# GSSAPIAuthentication no
|
|
# GSSAPIDelegateCredentials no
|
|
+# GSSAPIKeyExchange no
|
|
+# GSSAPITrustDNS no
|
|
# BatchMode no
|
|
# CheckHostIP yes
|
|
# AddressFamily any
|
|
diff --git a/ssh_config.5 b/ssh_config.5
|
|
index 06a32d31..3f490697 100644
|
|
--- a/ssh_config.5
|
|
+++ b/ssh_config.5
|
|
@@ -766,10 +766,67 @@ The default is
|
|
Specifies whether user authentication based on GSSAPI is allowed.
|
|
The default is
|
|
.Cm no .
|
|
+.It Cm GSSAPIClientIdentity
|
|
+If set, specifies the GSSAPI client identity that ssh should use when
|
|
+connecting to the server. The default is unset, which means that the default
|
|
+identity will be used.
|
|
.It Cm GSSAPIDelegateCredentials
|
|
Forward (delegate) credentials to the server.
|
|
The default is
|
|
.Cm no .
|
|
+.It Cm GSSAPIKeyExchange
|
|
+Specifies whether key exchange based on GSSAPI may be used. When using
|
|
+GSSAPI key exchange the server need not have a host key.
|
|
+The default is
|
|
+.Dq no .
|
|
+.It Cm GSSAPIRenewalForcesRekey
|
|
+If set to
|
|
+.Dq yes
|
|
+then renewal of the client's GSSAPI credentials will force the rekeying of the
|
|
+ssh connection. With a compatible server, this will delegate the renewed
|
|
+credentials to a session on the server.
|
|
+.Pp
|
|
+Checks are made to ensure that credentials are only propagated when the new
|
|
+credentials match the old ones on the originating client and where the
|
|
+receiving server still has the old set in its cache.
|
|
+.Pp
|
|
+The default is
|
|
+.Dq no .
|
|
+.Pp
|
|
+For this to work
|
|
+.Cm GSSAPIKeyExchange
|
|
+needs to be enabled in the server and also used by the client.
|
|
+.It Cm GSSAPIServerIdentity
|
|
+If set, specifies the GSSAPI server identity that ssh should expect when
|
|
+connecting to the server. The default is unset, which means that the
|
|
+expected GSSAPI server identity will be determined from the target
|
|
+hostname.
|
|
+.It Cm GSSAPITrustDns
|
|
+Set to
|
|
+.Dq yes
|
|
+to indicate that the DNS is trusted to securely canonicalize
|
|
+the name of the host being connected to. If
|
|
+.Dq no ,
|
|
+the hostname entered on the
|
|
+command line will be passed untouched to the GSSAPI library.
|
|
+The default is
|
|
+.Dq no .
|
|
+.It Cm GSSAPIKexAlgorithms
|
|
+The list of key exchange algorithms that are offered for GSSAPI
|
|
+key exchange. Possible values are
|
|
+.Bd -literal -offset 3n
|
|
+gss-gex-sha1-,
|
|
+gss-group1-sha1-,
|
|
+gss-group14-sha1-,
|
|
+gss-group14-sha256-,
|
|
+gss-group16-sha512-,
|
|
+gss-nistp256-sha256-,
|
|
+gss-curve25519-sha256-
|
|
+.Ed
|
|
+.Pp
|
|
+The default is
|
|
+.Dq gss-gex-sha1-,gss-group14-sha1- .
|
|
+This option only applies to protocol version 2 connections using GSSAPI.
|
|
.It Cm HashKnownHosts
|
|
Indicates that
|
|
.Xr ssh 1
|
|
diff --git a/sshconnect2.c b/sshconnect2.c
|
|
index af00fb30..03bc87eb 100644
|
|
--- a/sshconnect2.c
|
|
+++ b/sshconnect2.c
|
|
@@ -80,8 +80,6 @@
|
|
#endif
|
|
|
|
/* import */
|
|
-extern char *client_version_string;
|
|
-extern char *server_version_string;
|
|
extern Options options;
|
|
|
|
/*
|
|
@@ -163,6 +161,11 @@ ssh_kex2(struct ssh *ssh, char *host, struct sockaddr *hostaddr, u_short port)
|
|
char *s, *all_key;
|
|
int r, use_known_hosts_order = 0;
|
|
|
|
+#if defined(GSSAPI) && defined(WITH_OPENSSL)
|
|
+ char *orig = NULL, *gss = NULL;
|
|
+ char *gss_host = NULL;
|
|
+#endif
|
|
+
|
|
xxx_host = host;
|
|
xxx_hostaddr = hostaddr;
|
|
|
|
@@ -206,6 +209,42 @@ ssh_kex2(struct ssh *ssh, char *host, struct sockaddr *hostaddr, u_short port)
|
|
compat_pkalg_proposal(options.hostkeyalgorithms);
|
|
}
|
|
|
|
+#if defined(GSSAPI) && defined(WITH_OPENSSL)
|
|
+ if (options.gss_keyex) {
|
|
+ /* Add the GSSAPI mechanisms currently supported on this
|
|
+ * client to the key exchange algorithm proposal */
|
|
+ orig = myproposal[PROPOSAL_KEX_ALGS];
|
|
+
|
|
+ if (options.gss_server_identity) {
|
|
+ gss_host = xstrdup(options.gss_server_identity);
|
|
+ } else if (options.gss_trust_dns) {
|
|
+ gss_host = remote_hostname(ssh);
|
|
+ /* Fall back to specified host if we are using proxy command
|
|
+ * and can not use DNS on that socket */
|
|
+ if (strcmp(gss_host, "UNKNOWN") == 0) {
|
|
+ free(gss_host);
|
|
+ gss_host = xstrdup(host);
|
|
+ }
|
|
+ } else {
|
|
+ gss_host = xstrdup(host);
|
|
+ }
|
|
+
|
|
+ gss = ssh_gssapi_client_mechanisms(gss_host,
|
|
+ options.gss_client_identity, options.gss_kex_algorithms);
|
|
+ if (gss) {
|
|
+ debug("Offering GSSAPI proposal: %s", gss);
|
|
+ xasprintf(&myproposal[PROPOSAL_KEX_ALGS],
|
|
+ "%s,%s", gss, orig);
|
|
+
|
|
+ /* If we've got GSSAPI algorithms, then we also support the
|
|
+ * 'null' hostkey, as a last resort */
|
|
+ orig = myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS];
|
|
+ xasprintf(&myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS],
|
|
+ "%s,null", orig);
|
|
+ }
|
|
+ }
|
|
+#endif
|
|
+
|
|
if (options.rekey_limit || options.rekey_interval)
|
|
ssh_packet_set_rekey_limits(ssh, options.rekey_limit,
|
|
options.rekey_interval);
|
|
@@ -224,16 +256,46 @@ ssh_kex2(struct ssh *ssh, char *host, struct sockaddr *hostaddr, u_short port)
|
|
# ifdef OPENSSL_HAS_ECC
|
|
ssh->kex->kex[KEX_ECDH_SHA2] = kex_gen_client;
|
|
# endif
|
|
-#endif
|
|
+# ifdef GSSAPI
|
|
+ if (options.gss_keyex) {
|
|
+ ssh->kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_client;
|
|
+ ssh->kex->kex[KEX_GSS_GRP14_SHA1] = kexgss_client;
|
|
+ ssh->kex->kex[KEX_GSS_GRP14_SHA256] = kexgss_client;
|
|
+ ssh->kex->kex[KEX_GSS_GRP16_SHA512] = kexgss_client;
|
|
+ ssh->kex->kex[KEX_GSS_GEX_SHA1] = kexgssgex_client;
|
|
+ ssh->kex->kex[KEX_GSS_NISTP256_SHA256] = kexgss_client;
|
|
+ ssh->kex->kex[KEX_GSS_C25519_SHA256] = kexgss_client;
|
|
+ }
|
|
+# endif
|
|
+#endif /* WITH_OPENSSL */
|
|
ssh->kex->kex[KEX_C25519_SHA256] = kex_gen_client;
|
|
ssh->kex->kex[KEX_KEM_SNTRUP4591761X25519_SHA512] = kex_gen_client;
|
|
ssh->kex->verify_host_key=&verify_host_key_callback;
|
|
|
|
+#if defined(GSSAPI) && defined(WITH_OPENSSL)
|
|
+ if (options.gss_keyex) {
|
|
+ ssh->kex->gss_deleg_creds = options.gss_deleg_creds;
|
|
+ ssh->kex->gss_trust_dns = options.gss_trust_dns;
|
|
+ ssh->kex->gss_client = options.gss_client_identity;
|
|
+ ssh->kex->gss_host = gss_host;
|
|
+ }
|
|
+#endif
|
|
+
|
|
ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &ssh->kex->done);
|
|
|
|
/* remove ext-info from the KEX proposals for rekeying */
|
|
myproposal[PROPOSAL_KEX_ALGS] =
|
|
compat_kex_proposal(options.kex_algorithms);
|
|
+#if defined(GSSAPI) && defined(WITH_OPENSSL)
|
|
+ /* repair myproposal after it was crumpled by the */
|
|
+ /* ext-info removal above */
|
|
+ if (gss) {
|
|
+ orig = myproposal[PROPOSAL_KEX_ALGS];
|
|
+ xasprintf(&myproposal[PROPOSAL_KEX_ALGS],
|
|
+ "%s,%s", gss, orig);
|
|
+ free(gss);
|
|
+ }
|
|
+#endif
|
|
if ((r = kex_prop2buf(ssh->kex->my, myproposal)) != 0)
|
|
fatal("kex_prop2buf: %s", ssh_err(r));
|
|
|
|
@@ -330,6 +392,7 @@ static int input_gssapi_response(int type, u_int32_t, struct ssh *);
|
|
static int input_gssapi_token(int type, u_int32_t, struct ssh *);
|
|
static int input_gssapi_error(int, u_int32_t, struct ssh *);
|
|
static int input_gssapi_errtok(int, u_int32_t, struct ssh *);
|
|
+static int userauth_gsskeyex(struct ssh *);
|
|
#endif
|
|
|
|
void userauth(struct ssh *, char *);
|
|
@@ -346,6 +409,11 @@ static char *authmethods_get(void);
|
|
|
|
Authmethod authmethods[] = {
|
|
#ifdef GSSAPI
|
|
+ {"gssapi-keyex",
|
|
+ userauth_gsskeyex,
|
|
+ NULL,
|
|
+ &options.gss_keyex,
|
|
+ NULL},
|
|
{"gssapi-with-mic",
|
|
userauth_gssapi,
|
|
userauth_gssapi_cleanup,
|
|
@@ -716,12 +784,32 @@ userauth_gssapi(struct ssh *ssh)
|
|
OM_uint32 min;
|
|
int r, ok = 0;
|
|
gss_OID mech = NULL;
|
|
+ char *gss_host = NULL;
|
|
+
|
|
+ if (options.gss_server_identity) {
|
|
+ gss_host = xstrdup(options.gss_server_identity);
|
|
+ } else if (options.gss_trust_dns) {
|
|
+ gss_host = remote_hostname(ssh);
|
|
+ /* Fall back to specified host if we are using proxy command
|
|
+ * and can not use DNS on that socket */
|
|
+ if (strcmp(gss_host, "UNKNOWN") == 0) {
|
|
+ free(gss_host);
|
|
+ gss_host = xstrdup(authctxt->host);
|
|
+ }
|
|
+ } else {
|
|
+ gss_host = xstrdup(authctxt->host);
|
|
+ }
|
|
|
|
/* Try one GSSAPI method at a time, rather than sending them all at
|
|
* once. */
|
|
|
|
if (authctxt->gss_supported_mechs == NULL)
|
|
- gss_indicate_mechs(&min, &authctxt->gss_supported_mechs);
|
|
+ if (GSS_ERROR(gss_indicate_mechs(&min,
|
|
+ &authctxt->gss_supported_mechs))) {
|
|
+ authctxt->gss_supported_mechs = NULL;
|
|
+ free(gss_host);
|
|
+ return 0;
|
|
+ }
|
|
|
|
/* Check to see whether the mechanism is usable before we offer it */
|
|
while (authctxt->mech_tried < authctxt->gss_supported_mechs->count &&
|
|
@@ -730,13 +811,15 @@ userauth_gssapi(struct ssh *ssh)
|
|
elements[authctxt->mech_tried];
|
|
/* My DER encoding requires length<128 */
|
|
if (mech->length < 128 && ssh_gssapi_check_mechanism(&gssctxt,
|
|
- mech, authctxt->host)) {
|
|
+ mech, gss_host, options.gss_client_identity)) {
|
|
ok = 1; /* Mechanism works */
|
|
} else {
|
|
authctxt->mech_tried++;
|
|
}
|
|
}
|
|
|
|
+ free(gss_host);
|
|
+
|
|
if (!ok || mech == NULL)
|
|
return 0;
|
|
|
|
@@ -976,6 +1059,55 @@ input_gssapi_error(int type, u_int32_t plen, struct ssh *ssh)
|
|
free(lang);
|
|
return r;
|
|
}
|
|
+
|
|
+int
|
|
+userauth_gsskeyex(struct ssh *ssh)
|
|
+{
|
|
+ struct sshbuf *b = NULL;
|
|
+ Authctxt *authctxt = ssh->authctxt;
|
|
+ gss_buffer_desc gssbuf;
|
|
+ gss_buffer_desc mic = GSS_C_EMPTY_BUFFER;
|
|
+ OM_uint32 ms;
|
|
+ int r;
|
|
+
|
|
+ static int attempt = 0;
|
|
+ if (attempt++ >= 1)
|
|
+ return (0);
|
|
+
|
|
+ if (gss_kex_context == NULL) {
|
|
+ debug("No valid Key exchange context");
|
|
+ return (0);
|
|
+ }
|
|
+
|
|
+ if ((b = sshbuf_new()) == NULL)
|
|
+ fatal("%s: sshbuf_new failed", __func__);
|
|
+
|
|
+ ssh_gssapi_buildmic(b, authctxt->server_user, authctxt->service,
|
|
+ "gssapi-keyex");
|
|
+
|
|
+ if ((gssbuf.value = sshbuf_mutable_ptr(b)) == NULL)
|
|
+ fatal("%s: sshbuf_mutable_ptr failed", __func__);
|
|
+ gssbuf.length = sshbuf_len(b);
|
|
+
|
|
+ if (GSS_ERROR(ssh_gssapi_sign(gss_kex_context, &gssbuf, &mic))) {
|
|
+ sshbuf_free(b);
|
|
+ return (0);
|
|
+ }
|
|
+
|
|
+ if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
|
|
+ (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
|
|
+ (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
|
|
+ (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
|
|
+ (r = sshpkt_put_string(ssh, mic.value, mic.length)) != 0 ||
|
|
+ (r = sshpkt_send(ssh)) != 0)
|
|
+ fatal("%s: %s", __func__, ssh_err(r));
|
|
+
|
|
+ sshbuf_free(b);
|
|
+ gss_release_buffer(&ms, &mic);
|
|
+
|
|
+ return (1);
|
|
+}
|
|
+
|
|
#endif /* GSSAPI */
|
|
|
|
static int
|
|
diff --git a/sshd.c b/sshd.c
|
|
index 60b2aaf7..d92f03aa 100644
|
|
--- a/sshd.c
|
|
+++ b/sshd.c
|
|
@@ -817,8 +817,8 @@ notify_hostkeys(struct ssh *ssh)
|
|
}
|
|
debug3("%s: sent %u hostkeys", __func__, nkeys);
|
|
if (nkeys == 0)
|
|
- fatal("%s: no hostkeys", __func__);
|
|
- if ((r = sshpkt_send(ssh)) != 0)
|
|
+ debug3("%s: no hostkeys", __func__);
|
|
+ else if ((r = sshpkt_send(ssh)) != 0)
|
|
sshpkt_fatal(ssh, r, "%s: send", __func__);
|
|
sshbuf_free(buf);
|
|
}
|
|
@@ -1852,7 +1852,8 @@ main(int ac, char **av)
|
|
free(fp);
|
|
}
|
|
accumulate_host_timing_secret(cfg, NULL);
|
|
- if (!sensitive_data.have_ssh2_key) {
|
|
+ /* The GSSAPI key exchange can run without a host key */
|
|
+ if (!sensitive_data.have_ssh2_key && !options.gss_keyex) {
|
|
logit("sshd: no hostkeys available -- exiting.");
|
|
exit(1);
|
|
}
|
|
@@ -2347,6 +2348,48 @@ do_ssh2_kex(struct ssh *ssh)
|
|
myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = compat_pkalg_proposal(
|
|
list_hostkey_types());
|
|
|
|
+#if defined(GSSAPI) && defined(WITH_OPENSSL)
|
|
+ {
|
|
+ char *orig;
|
|
+ char *gss = NULL;
|
|
+ char *newstr = NULL;
|
|
+ orig = myproposal[PROPOSAL_KEX_ALGS];
|
|
+
|
|
+ /*
|
|
+ * If we don't have a host key, then there's no point advertising
|
|
+ * the other key exchange algorithms
|
|
+ */
|
|
+
|
|
+ if (strlen(myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS]) == 0)
|
|
+ orig = NULL;
|
|
+
|
|
+ if (options.gss_keyex)
|
|
+ gss = ssh_gssapi_server_mechanisms();
|
|
+ else
|
|
+ gss = NULL;
|
|
+
|
|
+ if (gss && orig)
|
|
+ xasprintf(&newstr, "%s,%s", gss, orig);
|
|
+ else if (gss)
|
|
+ newstr = gss;
|
|
+ else if (orig)
|
|
+ newstr = orig;
|
|
+
|
|
+ /*
|
|
+ * If we've got GSSAPI mechanisms, then we've got the 'null' host
|
|
+ * key alg, but we can't tell people about it unless its the only
|
|
+ * host key algorithm we support
|
|
+ */
|
|
+ if (gss && (strlen(myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS])) == 0)
|
|
+ myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = "null";
|
|
+
|
|
+ if (newstr)
|
|
+ myproposal[PROPOSAL_KEX_ALGS] = newstr;
|
|
+ else
|
|
+ fatal("No supported key exchange algorithms");
|
|
+ }
|
|
+#endif
|
|
+
|
|
/* start key exchange */
|
|
if ((r = kex_setup(ssh, myproposal)) != 0)
|
|
fatal("kex_setup: %s", ssh_err(r));
|
|
@@ -2362,7 +2405,18 @@ do_ssh2_kex(struct ssh *ssh)
|
|
# ifdef OPENSSL_HAS_ECC
|
|
kex->kex[KEX_ECDH_SHA2] = kex_gen_server;
|
|
# endif
|
|
-#endif
|
|
+# ifdef GSSAPI
|
|
+ if (options.gss_keyex) {
|
|
+ kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_server;
|
|
+ kex->kex[KEX_GSS_GRP14_SHA1] = kexgss_server;
|
|
+ kex->kex[KEX_GSS_GRP14_SHA256] = kexgss_server;
|
|
+ kex->kex[KEX_GSS_GRP16_SHA512] = kexgss_server;
|
|
+ kex->kex[KEX_GSS_GEX_SHA1] = kexgssgex_server;
|
|
+ kex->kex[KEX_GSS_NISTP256_SHA256] = kexgss_server;
|
|
+ kex->kex[KEX_GSS_C25519_SHA256] = kexgss_server;
|
|
+ }
|
|
+# endif
|
|
+#endif /* WITH_OPENSSL */
|
|
kex->kex[KEX_C25519_SHA256] = kex_gen_server;
|
|
kex->kex[KEX_KEM_SNTRUP4591761X25519_SHA512] = kex_gen_server;
|
|
kex->load_host_public_key=&get_hostkey_public_by_type;
|
|
diff --git a/sshd_config b/sshd_config
|
|
index 19b7c91a..2c48105f 100644
|
|
--- a/sshd_config
|
|
+++ b/sshd_config
|
|
@@ -69,6 +69,8 @@ AuthorizedKeysFile .ssh/authorized_keys
|
|
# GSSAPI options
|
|
#GSSAPIAuthentication no
|
|
#GSSAPICleanupCredentials yes
|
|
+#GSSAPIStrictAcceptorCheck yes
|
|
+#GSSAPIKeyExchange no
|
|
|
|
# Set this to 'yes' to enable PAM authentication, account processing,
|
|
# and session processing. If this is enabled, PAM authentication will
|
|
diff --git a/sshd_config.5 b/sshd_config.5
|
|
index 70ccea44..f6b41a2f 100644
|
|
--- a/sshd_config.5
|
|
+++ b/sshd_config.5
|
|
@@ -646,6 +646,11 @@ Specifies whether to automatically destroy the user's credentials cache
|
|
on logout.
|
|
The default is
|
|
.Cm yes .
|
|
+.It Cm GSSAPIKeyExchange
|
|
+Specifies whether key exchange based on GSSAPI is allowed. GSSAPI key exchange
|
|
+doesn't rely on ssh keys to verify host identity.
|
|
+The default is
|
|
+.Cm no .
|
|
.It Cm GSSAPIStrictAcceptorCheck
|
|
Determines whether to be strict about the identity of the GSSAPI acceptor
|
|
a client authenticates against.
|
|
@@ -660,6 +665,31 @@ machine's default store.
|
|
This facility is provided to assist with operation on multi homed machines.
|
|
The default is
|
|
.Cm yes .
|
|
+.It Cm GSSAPIStoreCredentialsOnRekey
|
|
+Controls whether the user's GSSAPI credentials should be updated following a
|
|
+successful connection rekeying. This option can be used to accepted renewed
|
|
+or updated credentials from a compatible client. The default is
|
|
+.Dq no .
|
|
+.Pp
|
|
+For this to work
|
|
+.Cm GSSAPIKeyExchange
|
|
+needs to be enabled in the server and also used by the client.
|
|
+.It Cm GSSAPIKexAlgorithms
|
|
+The list of key exchange algorithms that are accepted by GSSAPI
|
|
+key exchange. Possible values are
|
|
+.Bd -literal -offset 3n
|
|
+gss-gex-sha1-,
|
|
+gss-group1-sha1-,
|
|
+gss-group14-sha1-,
|
|
+gss-group14-sha256-,
|
|
+gss-group16-sha512-,
|
|
+gss-nistp256-sha256-,
|
|
+gss-curve25519-sha256-
|
|
+.Ed
|
|
+.Pp
|
|
+The default is
|
|
+.Dq gss-gex-sha1-,gss-group14-sha1- .
|
|
+This option only applies to protocol version 2 connections using GSSAPI.
|
|
.It Cm HostbasedAcceptedKeyTypes
|
|
Specifies the key types that will be accepted for hostbased authentication
|
|
as a list of comma-separated patterns.
|
|
diff --git a/sshkey.c b/sshkey.c
|
|
index 57995ee6..fd5b7724 100644
|
|
--- a/sshkey.c
|
|
+++ b/sshkey.c
|
|
@@ -154,6 +154,7 @@ static const struct keytype keytypes[] = {
|
|
KEY_ECDSA_SK_CERT, NID_X9_62_prime256v1, 1, 0 },
|
|
# endif /* OPENSSL_HAS_ECC */
|
|
#endif /* WITH_OPENSSL */
|
|
+ { "null", "null", NULL, KEY_NULL, 0, 0, 0 },
|
|
{ NULL, NULL, NULL, -1, -1, 0, 0 }
|
|
};
|
|
|
|
@@ -255,7 +256,7 @@ sshkey_alg_list(int certs_only, int plain_only, int include_sigonly, char sep)
|
|
const struct keytype *kt;
|
|
|
|
for (kt = keytypes; kt->type != -1; kt++) {
|
|
- if (kt->name == NULL)
|
|
+ if (kt->name == NULL || kt->type == KEY_NULL)
|
|
continue;
|
|
if (!include_sigonly && kt->sigonly)
|
|
continue;
|
|
diff --git a/sshkey.h b/sshkey.h
|
|
index 71a3fddc..37a43a67 100644
|
|
--- a/sshkey.h
|
|
+++ b/sshkey.h
|
|
@@ -69,6 +69,7 @@ enum sshkey_types {
|
|
KEY_ECDSA_SK_CERT,
|
|
KEY_ED25519_SK,
|
|
KEY_ED25519_SK_CERT,
|
|
+ KEY_NULL,
|
|
KEY_UNSPEC
|
|
};
|
|
|