* Drop unaccepted (unapplying) coverity patches * Drop server support for SSH1 (server) * Workaround #2641 for systemd * UseLogin is gone * Drop upstream commit 28652bca * Tighten seccomp filter (cache credentials before entering sandbox) (#1395288)
518 lines
18 KiB
Diff
518 lines
18 KiB
Diff
diff -up openssh-7.4p1/auth2.c.expose-pam openssh-7.4p1/auth2.c
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--- openssh-7.4p1/auth2.c.expose-pam 2016-12-23 15:40:26.768447868 +0100
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+++ openssh-7.4p1/auth2.c 2016-12-23 15:40:26.818447876 +0100
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@@ -310,6 +310,7 @@ userauth_finish(Authctxt *authctxt, int
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const char *submethod)
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{
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char *methods;
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+ char *prev_auth_details;
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int partial = 0;
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if (!authctxt->valid && authenticated)
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@@ -340,6 +341,18 @@ userauth_finish(Authctxt *authctxt, int
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if (authctxt->postponed)
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return;
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+ if (authenticated || partial) {
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+ prev_auth_details = authctxt->auth_details;
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+ xasprintf(&authctxt->auth_details, "%s%s%s%s%s",
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+ prev_auth_details ? prev_auth_details : "",
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+ prev_auth_details ? ", " : "", method,
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+ authctxt->last_details ? ": " : "",
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+ authctxt->last_details ? authctxt->last_details : "");
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+ free(prev_auth_details);
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+ }
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+ free(authctxt->last_details);
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+ authctxt->last_details = NULL;
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+
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#ifdef USE_PAM
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if (options.use_pam && authenticated) {
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if (!PRIVSEP(do_pam_account())) {
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diff -up openssh-7.4p1/auth2-gss.c.expose-pam openssh-7.4p1/auth2-gss.c
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--- openssh-7.4p1/auth2-gss.c.expose-pam 2016-12-23 15:40:26.769447868 +0100
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+++ openssh-7.4p1/auth2-gss.c 2016-12-23 15:40:26.818447876 +0100
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@@ -276,6 +276,9 @@ input_gssapi_exchange_complete(int type,
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authenticated = PRIVSEP(ssh_gssapi_userok(authctxt->user,
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authctxt->pw));
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+ if (authenticated)
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+ authctxt->last_details = ssh_gssapi_get_displayname();
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+
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authctxt->postponed = 0;
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dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
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dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, NULL);
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@@ -322,6 +325,9 @@ input_gssapi_mic(int type, u_int32_t ple
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else
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logit("GSSAPI MIC check failed");
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+ if (authenticated)
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+ authctxt->last_details = ssh_gssapi_get_displayname();
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+
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buffer_free(&b);
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if (micuser != authctxt->user)
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free(micuser);
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diff -up openssh-7.4p1/auth2-hostbased.c.expose-pam openssh-7.4p1/auth2-hostbased.c
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--- openssh-7.4p1/auth2-hostbased.c.expose-pam 2016-12-23 15:40:26.731447862 +0100
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+++ openssh-7.4p1/auth2-hostbased.c 2016-12-23 15:40:26.818447876 +0100
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@@ -60,7 +60,7 @@ userauth_hostbased(Authctxt *authctxt)
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{
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Buffer b;
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Key *key = NULL;
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- char *pkalg, *cuser, *chost, *service;
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+ char *pkalg, *cuser, *chost, *service, *pubkey;
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u_char *pkblob, *sig;
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u_int alen, blen, slen;
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int pktype;
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@@ -140,15 +140,21 @@ userauth_hostbased(Authctxt *authctxt)
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buffer_dump(&b);
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#endif
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- pubkey_auth_info(authctxt, key,
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- "client user \"%.100s\", client host \"%.100s\"", cuser, chost);
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+ pubkey = sshkey_format_oneline(key, options.fingerprint_hash);
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+ auth_info(authctxt,
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+ "%s, client user \"%.100s\", client host \"%.100s\"",
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+ pubkey, cuser, chost);
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/* test for allowed key and correct signature */
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authenticated = 0;
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if (PRIVSEP(hostbased_key_allowed(authctxt->pw, cuser, chost, key)) &&
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PRIVSEP(key_verify(key, sig, slen, buffer_ptr(&b),
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- buffer_len(&b))) == 1)
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+ buffer_len(&b))) == 1) {
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authenticated = 1;
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+ authctxt->last_details = pubkey;
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+ } else {
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+ free(pubkey);
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+ }
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buffer_free(&b);
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done:
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diff -up openssh-7.4p1/auth2-pubkey.c.expose-pam openssh-7.4p1/auth2-pubkey.c
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--- openssh-7.4p1/auth2-pubkey.c.expose-pam 2016-12-23 15:40:26.746447864 +0100
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+++ openssh-7.4p1/auth2-pubkey.c 2016-12-23 15:40:26.819447876 +0100
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@@ -79,7 +79,7 @@ userauth_pubkey(Authctxt *authctxt)
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{
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Buffer b;
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Key *key = NULL;
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- char *pkalg, *userstyle, *fp = NULL;
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+ char *pkalg, *userstyle, *pubkey, *fp = NULL;
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u_char *pkblob, *sig;
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u_int alen, blen, slen;
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int have_sig, pktype;
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@@ -177,7 +177,8 @@ userauth_pubkey(Authctxt *authctxt)
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#ifdef DEBUG_PK
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buffer_dump(&b);
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#endif
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- pubkey_auth_info(authctxt, key, NULL);
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+ pubkey = sshkey_format_oneline(key, options.fingerprint_hash);
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+ auth_info(authctxt, "%s", pubkey);
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/* test for correct signature */
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authenticated = 0;
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@@ -185,9 +186,12 @@ userauth_pubkey(Authctxt *authctxt)
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PRIVSEP(key_verify(key, sig, slen, buffer_ptr(&b),
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buffer_len(&b))) == 1) {
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authenticated = 1;
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+ authctxt->last_details = pubkey;
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/* Record the successful key to prevent reuse */
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auth2_record_userkey(authctxt, key);
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key = NULL; /* Don't free below */
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+ } else {
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+ free(pubkey);
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}
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buffer_free(&b);
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free(sig);
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@@ -228,7 +232,7 @@ done:
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void
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pubkey_auth_info(Authctxt *authctxt, const Key *key, const char *fmt, ...)
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{
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- char *fp, *extra;
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+ char *extra, *pubkey;
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va_list ap;
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int i;
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@@ -238,27 +242,13 @@ pubkey_auth_info(Authctxt *authctxt, con
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i = vasprintf(&extra, fmt, ap);
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va_end(ap);
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if (i < 0 || extra == NULL)
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- fatal("%s: vasprintf failed", __func__);
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+ fatal("%s: vasprintf failed", __func__);
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}
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- if (key_is_cert(key)) {
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- fp = sshkey_fingerprint(key->cert->signature_key,
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- options.fingerprint_hash, SSH_FP_DEFAULT);
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- auth_info(authctxt, "%s ID %s (serial %llu) CA %s %s%s%s",
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- key_type(key), key->cert->key_id,
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- (unsigned long long)key->cert->serial,
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- key_type(key->cert->signature_key),
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- fp == NULL ? "(null)" : fp,
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- extra == NULL ? "" : ", ", extra == NULL ? "" : extra);
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- free(fp);
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- } else {
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- fp = sshkey_fingerprint(key, options.fingerprint_hash,
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- SSH_FP_DEFAULT);
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- auth_info(authctxt, "%s %s%s%s", key_type(key),
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- fp == NULL ? "(null)" : fp,
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- extra == NULL ? "" : ", ", extra == NULL ? "" : extra);
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- free(fp);
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- }
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+ pubkey = sshkey_format_oneline(key, options.fingerprint_hash);
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+ auth_info(authctxt, "%s%s%s", pubkey, extra == NULL ? "" : ", ",
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+ extra == NULL ? "" : extra);
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+ free(pubkey);
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free(extra);
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}
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diff -up openssh-7.4p1/auth.h.expose-pam openssh-7.4p1/auth.h
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--- openssh-7.4p1/auth.h.expose-pam 2016-12-23 15:40:26.782447870 +0100
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+++ openssh-7.4p1/auth.h 2016-12-23 15:40:26.819447876 +0100
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@@ -84,6 +84,9 @@ struct Authctxt {
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struct sshkey **prev_userkeys;
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u_int nprev_userkeys;
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+
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+ char *last_details;
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+ char *auth_details;
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};
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/*
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* Every authentication method has to handle authentication requests for
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diff -up openssh-7.4p1/auth-pam.c.expose-pam openssh-7.4p1/auth-pam.c
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--- openssh-7.4p1/auth-pam.c.expose-pam 2016-12-23 15:40:26.731447862 +0100
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+++ openssh-7.4p1/auth-pam.c 2016-12-23 15:40:26.819447876 +0100
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@@ -688,6 +688,11 @@ sshpam_init_ctx(Authctxt *authctxt)
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return (NULL);
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}
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+ /* Notify PAM about any already successful auth methods */
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+ if (options.expose_auth_methods >= EXPOSE_AUTHMETH_PAMONLY &&
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+ authctxt->auth_details)
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+ do_pam_putenv("SSH_USER_AUTH", authctxt->auth_details);
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+
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ctxt = xcalloc(1, sizeof *ctxt);
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/* Start the authentication thread */
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diff -up openssh-7.4p1/gss-serv.c.expose-pam openssh-7.4p1/gss-serv.c
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--- openssh-7.4p1/gss-serv.c.expose-pam 2016-12-23 15:40:26.808447874 +0100
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+++ openssh-7.4p1/gss-serv.c 2016-12-23 15:40:26.819447876 +0100
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@@ -441,6 +441,16 @@ ssh_gssapi_do_child(char ***envp, u_int
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}
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/* Privileged */
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+char*
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+ssh_gssapi_get_displayname(void)
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+{
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+ if (gssapi_client.displayname.length != 0 &&
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+ gssapi_client.displayname.value != NULL)
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+ return strdup((char *)gssapi_client.displayname.value);
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+ return NULL;
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+}
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+
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+/* Privileged */
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int
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ssh_gssapi_userok(char *user, struct passwd *pw)
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{
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diff -up openssh-7.4p1/monitor.c.expose-pam openssh-7.4p1/monitor.c
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--- openssh-7.4p1/monitor.c.expose-pam 2016-12-23 15:40:26.794447872 +0100
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+++ openssh-7.4p1/monitor.c 2016-12-23 15:41:16.473455863 +0100
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@@ -300,6 +300,7 @@ monitor_child_preauth(Authctxt *_authctx
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{
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struct mon_table *ent;
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int authenticated = 0, partial = 0;
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+ char *prev_auth_details;
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debug3("preauth child monitor started");
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@@ -330,6 +331,18 @@ monitor_child_preauth(Authctxt *_authctx
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auth_submethod = NULL;
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authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1);
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+ if (authenticated) {
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+ prev_auth_details = authctxt->auth_details;
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+ xasprintf(&authctxt->auth_details, "%s%s%s%s%s",
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+ prev_auth_details ? prev_auth_details : "",
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+ prev_auth_details ? ", " : "", auth_method,
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+ authctxt->last_details ? ": " : "",
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+ authctxt->last_details ? authctxt->last_details : "");
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+ free(prev_auth_details);
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+ }
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+ free(authctxt->last_details);
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+ authctxt->last_details = NULL;
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+
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/* Special handling for multiple required authentications */
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if (options.num_auth_methods != 0) {
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if (authenticated &&
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@@ -1417,6 +1430,10 @@ mm_answer_keyverify(int sock, Buffer *m)
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debug3("%s: key %p signature %s",
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__func__, key, (verified == 1) ? "verified" : "unverified");
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+ if (verified == 1)
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+ authctxt->last_details = sshkey_format_oneline(key,
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+ options.fingerprint_hash);
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+
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/* If auth was successful then record key to ensure it isn't reused */
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if (verified == 1 && key_blobtype == MM_USERKEY)
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auth2_record_userkey(authctxt, key);
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@@ -1860,6 +1877,9 @@ mm_answer_gss_userok(int sock, Buffer *m
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auth_method = "gssapi-with-mic";
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+ if (authenticated)
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+ authctxt->last_details = ssh_gssapi_get_displayname();
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+
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/* Monitor loop will terminate if authenticated */
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return (authenticated);
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}
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diff -up openssh-7.4p1/servconf.c.expose-pam openssh-7.4p1/servconf.c
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--- openssh-7.4p1/servconf.c.expose-pam 2016-12-23 15:40:26.810447875 +0100
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+++ openssh-7.4p1/servconf.c 2016-12-23 15:44:04.691482920 +0100
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@@ -171,6 +171,7 @@ initialize_server_options(ServerOptions
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options->disable_forwarding = -1;
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options->use_kuserok = -1;
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options->enable_k5users = -1;
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+ options->expose_auth_methods = -1;
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}
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/* Returns 1 if a string option is unset or set to "none" or 0 otherwise. */
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@@ -354,6 +355,8 @@ fill_default_server_options(ServerOption
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options->use_kuserok = 1;
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if (options->enable_k5users == -1)
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options->enable_k5users = 0;
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+ if (options->expose_auth_methods == -1)
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+ options->expose_auth_methods = EXPOSE_AUTHMETH_NEVER;
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assemble_algorithms(options);
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@@ -439,6 +442,7 @@ typedef enum {
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sAuthenticationMethods, sHostKeyAgent, sPermitUserRC,
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sStreamLocalBindMask, sStreamLocalBindUnlink,
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sAllowStreamLocalForwarding, sFingerprintHash, sDisableForwarding,
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+ sExposeAuthenticationMethods,
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sDeprecated, sIgnore, sUnsupported
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} ServerOpCodes;
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@@ -595,6 +599,7 @@ static struct {
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{ "allowstreamlocalforwarding", sAllowStreamLocalForwarding, SSHCFG_ALL },
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{ "fingerprinthash", sFingerprintHash, SSHCFG_GLOBAL },
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{ "disableforwarding", sDisableForwarding, SSHCFG_ALL },
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+ { "exposeauthenticationmethods", sExposeAuthenticationMethods, SSHCFG_ALL },
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{ NULL, sBadOption, 0 }
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};
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@@ -984,6 +989,12 @@ static const struct multistate multistat
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{ "local", FORWARD_LOCAL },
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{ NULL, -1 }
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};
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+static const struct multistate multistate_exposeauthmeth[] = {
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+ { "never", EXPOSE_AUTHMETH_NEVER },
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+ { "pam-only", EXPOSE_AUTHMETH_PAMONLY },
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+ { "pam-and-env", EXPOSE_AUTHMETH_PAMENV },
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+ { NULL, -1}
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+};
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int
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process_server_config_line(ServerOptions *options, char *line,
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@@ -1902,6 +1913,11 @@ process_server_config_line(ServerOptions
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options->fingerprint_hash = value;
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break;
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+ case sExposeAuthenticationMethods:
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+ intptr = &options->expose_auth_methods;
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+ multistate_ptr = multistate_exposeauthmeth;
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+ goto parse_multistate;
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+
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case sDeprecated:
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case sIgnore:
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case sUnsupported:
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@@ -2060,6 +2076,7 @@ copy_set_server_options(ServerOptions *d
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M_CP_INTOPT(enable_k5users);
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M_CP_INTOPT(rekey_limit);
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M_CP_INTOPT(rekey_interval);
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+ M_CP_INTOPT(expose_auth_methods);
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/*
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* The bind_mask is a mode_t that may be unsigned, so we can't use
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@@ -2176,6 +2193,8 @@ fmt_intarg(ServerOpCodes code, int val)
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return fmt_multistate_int(val, multistate_tcpfwd);
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case sFingerprintHash:
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return ssh_digest_alg_name(val);
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+ case sExposeAuthenticationMethods:
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+ return fmt_multistate_int(val, multistate_exposeauthmeth);
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default:
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switch (val) {
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case 0:
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@@ -2356,6 +2375,7 @@ dump_config(ServerOptions *o)
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dump_cfg_fmtint(sFingerprintHash, o->fingerprint_hash);
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dump_cfg_fmtint(sKerberosUseKuserok, o->use_kuserok);
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dump_cfg_fmtint(sGssEnablek5users, o->enable_k5users);
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+ dump_cfg_fmtint(sExposeAuthenticationMethods, o->expose_auth_methods);
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/* string arguments */
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dump_cfg_string(sPidFile, o->pid_file);
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diff -up openssh-7.4p1/servconf.h.expose-pam openssh-7.4p1/servconf.h
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--- openssh-7.4p1/servconf.h.expose-pam 2016-12-23 15:40:26.810447875 +0100
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+++ openssh-7.4p1/servconf.h 2016-12-23 15:40:26.821447876 +0100
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@@ -48,6 +48,11 @@
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#define FORWARD_LOCAL (1<<1)
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#define FORWARD_ALLOW (FORWARD_REMOTE|FORWARD_LOCAL)
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+/* Expose AuthenticationMethods */
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+#define EXPOSE_AUTHMETH_NEVER 0
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+#define EXPOSE_AUTHMETH_PAMONLY 1
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+#define EXPOSE_AUTHMETH_PAMENV 2
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+
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#define DEFAULT_AUTH_FAIL_MAX 6 /* Default for MaxAuthTries */
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#define DEFAULT_SESSIONS_MAX 10 /* Default for MaxSessions */
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@@ -195,6 +200,8 @@ typedef struct {
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char *auth_methods[MAX_AUTH_METHODS];
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int fingerprint_hash;
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+
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+ int expose_auth_methods; /* EXPOSE_AUTHMETH_* above */
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} ServerOptions;
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/* Information about the incoming connection as used by Match */
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diff -up openssh-7.4p1/session.c.expose-pam openssh-7.4p1/session.c
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--- openssh-7.4p1/session.c.expose-pam 2016-12-23 15:40:26.794447872 +0100
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+++ openssh-7.4p1/session.c 2016-12-23 15:40:26.821447876 +0100
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@@ -997,6 +997,12 @@ copy_environment(char **source, char ***
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}
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*var_val++ = '\0';
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+ if (options.expose_auth_methods < EXPOSE_AUTHMETH_PAMENV &&
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+ strcmp(var_name, "SSH_USER_AUTH") == 0) {
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+ free(var_name);
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+ continue;
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+ }
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+
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debug3("Copy environment: %s=%s", var_name, var_val);
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child_set_env(env, envsize, var_name, var_val);
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@@ -1173,6 +1179,11 @@ do_setup_env(Session *s, const char *she
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}
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#endif /* USE_PAM */
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+ if (options.expose_auth_methods >= EXPOSE_AUTHMETH_PAMENV &&
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+ s->authctxt->auth_details)
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+ child_set_env(&env, &envsize, "SSH_USER_AUTH",
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+ s->authctxt->auth_details);
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+
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if (auth_sock_name != NULL)
|
|
child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
|
|
auth_sock_name);
|
|
@@ -2561,6 +2572,9 @@ do_cleanup(Authctxt *authctxt)
|
|
if (authctxt == NULL)
|
|
return;
|
|
|
|
+ free(authctxt->auth_details);
|
|
+ authctxt->auth_details = NULL;
|
|
+
|
|
#ifdef USE_PAM
|
|
if (options.use_pam) {
|
|
sshpam_cleanup();
|
|
diff -up openssh-7.4p1/ssh.1.expose-pam openssh-7.4p1/ssh.1
|
|
--- openssh-7.4p1/ssh.1.expose-pam 2016-12-23 15:40:26.810447875 +0100
|
|
+++ openssh-7.4p1/ssh.1 2016-12-23 15:40:26.822447877 +0100
|
|
@@ -1421,6 +1421,10 @@ server IP address, and server port numbe
|
|
This variable contains the original command line if a forced command
|
|
is executed.
|
|
It can be used to extract the original arguments.
|
|
+.It Ev SSH_USER_AUTH
|
|
+This variable contains, for SSH2 only, a comma-separated list of authentication
|
|
+methods that were successfuly used to authenticate. When possible, these
|
|
+methods are extended with detailed information on the credential used.
|
|
.It Ev SSH_TTY
|
|
This is set to the name of the tty (path to the device) associated
|
|
with the current shell or command.
|
|
diff -up openssh-7.4p1/sshd_config.5.expose-pam openssh-7.4p1/sshd_config.5
|
|
--- openssh-7.4p1/sshd_config.5.expose-pam 2016-12-23 15:40:26.822447877 +0100
|
|
+++ openssh-7.4p1/sshd_config.5 2016-12-23 15:45:22.411495421 +0100
|
|
@@ -570,6 +570,21 @@ Disables all forwarding features, includ
|
|
TCP and StreamLocal.
|
|
This option overrides all other forwarding-related options and may
|
|
simplify restricted configurations.
|
|
+.It Cm ExposeAuthenticationMethods
|
|
+When using SSH2, this option controls the exposure of the list of
|
|
+successful authentication methods to PAM during the authentication
|
|
+and to the shell environment via the
|
|
+.Cm SSH_USER_AUTH
|
|
+variable. See the description of this variable for more details.
|
|
+Valid options are:
|
|
+.Cm never
|
|
+(Do not expose successful authentication methods),
|
|
+.Cm pam-only
|
|
+(Only expose them to PAM during authentication, not afterwards),
|
|
+.Cm pam-and-env
|
|
+(Expose them to PAM and keep them in the shell environment).
|
|
+The default is
|
|
+.Cm never .
|
|
.It Cm FingerprintHash
|
|
Specifies the hash algorithm used when logging key fingerprints.
|
|
Valid options are:
|
|
diff -up openssh-7.4p1/ssh-gss.h.expose-pam openssh-7.4p1/ssh-gss.h
|
|
--- openssh-7.4p1/ssh-gss.h.expose-pam 2016-12-23 15:40:26.811447875 +0100
|
|
+++ openssh-7.4p1/ssh-gss.h 2016-12-23 15:40:26.823447877 +0100
|
|
@@ -159,6 +159,7 @@ int ssh_gssapi_server_check_mech(Gssctxt
|
|
const char *);
|
|
OM_uint32 ssh_gssapi_server_ctx(Gssctxt **, gss_OID);
|
|
int ssh_gssapi_userok(char *name, struct passwd *);
|
|
+char* ssh_gssapi_get_displayname(void);
|
|
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);
|
|
diff -up openssh-7.4p1/sshkey.c.expose-pam openssh-7.4p1/sshkey.c
|
|
--- openssh-7.4p1/sshkey.c.expose-pam 2016-12-23 15:40:26.777447869 +0100
|
|
+++ openssh-7.4p1/sshkey.c 2016-12-23 15:40:26.823447877 +0100
|
|
@@ -57,6 +57,7 @@
|
|
#define SSHKEY_INTERNAL
|
|
#include "sshkey.h"
|
|
#include "match.h"
|
|
+#include "xmalloc.h"
|
|
|
|
/* openssh private key file format */
|
|
#define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n"
|
|
@@ -1191,6 +1192,30 @@ sshkey_fingerprint(const struct sshkey *
|
|
return retval;
|
|
}
|
|
|
|
+char *
|
|
+sshkey_format_oneline(const struct sshkey *key, int dgst_alg)
|
|
+{
|
|
+ char *fp, *result;
|
|
+
|
|
+ if (sshkey_is_cert(key)) {
|
|
+ fp = sshkey_fingerprint(key->cert->signature_key, dgst_alg,
|
|
+ SSH_FP_DEFAULT);
|
|
+ xasprintf(&result, "%s ID %s (serial %llu) CA %s %s",
|
|
+ sshkey_type(key), key->cert->key_id,
|
|
+ (unsigned long long)key->cert->serial,
|
|
+ sshkey_type(key->cert->signature_key),
|
|
+ fp == NULL ? "(null)" : fp);
|
|
+ free(fp);
|
|
+ } else {
|
|
+ fp = sshkey_fingerprint(key, dgst_alg, SSH_FP_DEFAULT);
|
|
+ xasprintf(&result, "%s %s", sshkey_type(key),
|
|
+ fp == NULL ? "(null)" : fp);
|
|
+ free(fp);
|
|
+ }
|
|
+
|
|
+ return result;
|
|
+}
|
|
+
|
|
#ifdef WITH_SSH1
|
|
/*
|
|
* Reads a multiple-precision integer in decimal from the buffer, and advances
|
|
diff -up openssh-7.4p1/sshkey.h.expose-pam openssh-7.4p1/sshkey.h
|
|
--- openssh-7.4p1/sshkey.h.expose-pam 2016-12-23 15:40:26.777447869 +0100
|
|
+++ openssh-7.4p1/sshkey.h 2016-12-23 15:40:26.823447877 +0100
|
|
@@ -124,6 +124,7 @@ char *sshkey_fingerprint(const struct s
|
|
int, enum sshkey_fp_rep);
|
|
int sshkey_fingerprint_raw(const struct sshkey *k,
|
|
int, u_char **retp, size_t *lenp);
|
|
+char *sshkey_format_oneline(const struct sshkey *k, int dgst_alg);
|
|
const char *sshkey_type(const struct sshkey *);
|
|
const char *sshkey_cert_type(const struct sshkey *);
|
|
int sshkey_write(const struct sshkey *, FILE *);
|