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9cefae06b0
openssh/openssh-5.8p1-audit4.patch
Jan F 9cefae06b0 another audit improovements
2011-02-21 19:33:56 +01:00

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diff -up openssh-5.8p1/audit-bsm.c.audit4 openssh-5.8p1/audit-bsm.c
--- openssh-5.8p1/audit-bsm.c.audit4 2011-02-21 18:38:45.000000000 +0100
+++ openssh-5.8p1/audit-bsm.c 2011-02-21 18:38:45.000000000 +0100
@@ -395,4 +395,10 @@ audit_kex_body(int ctos, char *enc, char
{
/* not implemented */
}
+
+void
+audit_session_key_free_body(int ctos)
+{
+ /* not implemented */
+}
#endif /* BSM */
diff -up openssh-5.8p1/audit.c.audit4 openssh-5.8p1/audit.c
--- openssh-5.8p1/audit.c.audit4 2011-02-21 18:38:45.000000000 +0100
+++ openssh-5.8p1/audit.c 2011-02-21 18:38:45.000000000 +0100
@@ -143,6 +143,12 @@ audit_kex(int ctos, char *enc, char *mac
PRIVSEP(audit_kex_body(ctos, enc, mac, comp, getpid(), getuid()));
}
+void
+audit_session_key_free(int ctos)
+{
+ PRIVSEP(audit_session_key_free_body(ctos));
+}
+
# ifndef CUSTOM_SSH_AUDIT_EVENTS
/*
* Null implementations of audit functions.
@@ -247,5 +253,14 @@ audit_kex_body(int ctos, char *enc, char
(unsigned)geteuid(), ctos, enc, mac, compress, (long)pid,
(unsigned)uid);
}
+
+/*
+ * This will be called on succesfull session key discard
+ */
+void
+audit_session_key_free_body(int ctos)
+{
+ debug("audit session key discard euid %d direction %d", geteuid(), ctos);
+}
# endif /* !defined CUSTOM_SSH_AUDIT_EVENTS */
#endif /* SSH_AUDIT_EVENTS */
diff -up openssh-5.8p1/audit.h.audit4 openssh-5.8p1/audit.h
--- openssh-5.8p1/audit.h.audit4 2011-02-21 18:38:45.000000000 +0100
+++ openssh-5.8p1/audit.h 2011-02-21 18:38:45.000000000 +0100
@@ -60,5 +60,7 @@ void audit_unsupported(int);
void audit_kex(int, char *, char *, char *);
void audit_unsupported_body(int);
void audit_kex_body(int, char *, char *, char *, pid_t, uid_t);
+void audit_session_key_free(int ctos);
+void audit_session_key_free_body(int ctos);
#endif /* _SSH_AUDIT_H */
diff -up openssh-5.8p1/audit-linux.c.audit4 openssh-5.8p1/audit-linux.c
--- openssh-5.8p1/audit-linux.c.audit4 2011-02-21 18:38:45.000000000 +0100
+++ openssh-5.8p1/audit-linux.c 2011-02-21 18:38:45.000000000 +0100
@@ -266,6 +266,8 @@ audit_unsupported_body(int what)
#endif
}
+const static char *direction[] = { "from-server", "from-client", "both" };
+
void
audit_kex_body(int ctos, char *enc, char *mac, char *compress, pid_t pid,
uid_t uid)
@@ -273,7 +275,6 @@ audit_kex_body(int ctos, char *enc, char
#ifdef AUDIT_CRYPTO_SESSION
char buf[AUDIT_LOG_SIZE];
int audit_fd, audit_ok;
- const static char *direction[] = { "from-server", "from-client", "both" };
Cipher *cipher = cipher_by_name(enc);
snprintf(buf, sizeof(buf), "op=start direction=%s cipher=%s ksize=%d spid=%jd suid=%jd rport=%d laddr=%s lport=%d",
@@ -297,4 +298,29 @@ audit_kex_body(int ctos, char *enc, char
#endif
}
+void
+audit_session_key_free_body(int ctos)
+{
+ char buf[AUDIT_LOG_SIZE];
+ int audit_fd, audit_ok;
+
+ snprintf(buf, sizeof(buf), "op=destroy kind=session direction=%s rport=%d laddr=%s lport=%d",
+ direction[ctos], get_remote_port(),
+ get_local_ipaddr(packet_get_connection_in()),
+ get_local_port());
+ audit_fd = audit_open();
+ if (audit_fd < 0) {
+ if (errno != EINVAL && errno != EPROTONOSUPPORT &&
+ errno != EAFNOSUPPORT)
+ error("cannot open audit");
+ return;
+ }
+ audit_ok = audit_log_user_message(audit_fd, AUDIT_CRYPTO_KEY_USER,
+ buf, NULL, get_remote_ipaddr(), NULL, 1);
+ audit_close(audit_fd);
+ /* do not abort if the error is EPERM and sshd is run as non root user */
+ if ((audit_ok < 0) && ((audit_ok != -1) || (getuid() == 0)))
+ error("cannot write into audit");
+}
+
#endif /* USE_LINUX_AUDIT */
diff -up openssh-5.8p1/auditstub.c.audit4 openssh-5.8p1/auditstub.c
--- openssh-5.8p1/auditstub.c.audit4 2011-02-21 18:38:45.000000000 +0100
+++ openssh-5.8p1/auditstub.c 2011-02-21 18:38:45.000000000 +0100
@@ -37,3 +37,7 @@ audit_kex(int ctos, char *enc, char *mac
{
}
+void
+audit_session_key_free(int ctos)
+{
+}
diff -up openssh-5.8p1/kex.c.audit4 openssh-5.8p1/kex.c
--- openssh-5.8p1/kex.c.audit4 2011-02-21 18:38:45.000000000 +0100
+++ openssh-5.8p1/kex.c 2011-02-21 18:38:45.000000000 +0100
@@ -624,3 +624,34 @@ dump_digest(char *msg, u_char *digest, i
fprintf(stderr, "\n");
}
#endif
+
+static void
+enc_destroy(Enc *enc)
+{
+ if (enc == NULL)
+ return;
+
+ if (enc->key) {
+ memset(enc->key, 0, enc->key_len);
+ xfree(enc->key);
+ }
+
+ if (enc->iv) {
+ memset(enc->iv, 0, enc->block_size);
+ xfree(enc->iv);
+ }
+
+ memset(enc, 0, sizeof(*enc));
+}
+
+void
+newkeys_destroy(Newkeys *newkeys)
+{
+ if (newkeys == NULL)
+ return;
+
+ enc_destroy(&newkeys->enc);
+ mac_destroy(&newkeys->mac);
+ memset(&newkeys->comp, 0, sizeof(newkeys->comp));
+}
+
diff -up openssh-5.8p1/kex.h.audit4 openssh-5.8p1/kex.h
--- openssh-5.8p1/kex.h.audit4 2010-09-24 14:11:14.000000000 +0200
+++ openssh-5.8p1/kex.h 2011-02-21 18:38:45.000000000 +0100
@@ -156,6 +156,8 @@ void kexgex_server(Kex *);
void kexecdh_client(Kex *);
void kexecdh_server(Kex *);
+void newkeys_destroy(Newkeys *newkeys);
+
void
kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int,
BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *);
diff -up openssh-5.8p1/mac.c.audit4 openssh-5.8p1/mac.c
--- openssh-5.8p1/mac.c.audit4 2008-06-13 02:58:50.000000000 +0200
+++ openssh-5.8p1/mac.c 2011-02-21 18:38:45.000000000 +0100
@@ -162,6 +162,20 @@ mac_clear(Mac *mac)
mac->umac_ctx = NULL;
}
+void
+mac_destroy(Mac *mac)
+{
+ if (mac == NULL)
+ return;
+
+ if (mac->key) {
+ memset(mac->key, 0, mac->key_len);
+ xfree(mac->key);
+ }
+
+ memset(mac, 0, sizeof(*mac));
+}
+
/* XXX copied from ciphers_valid */
#define MAC_SEP ","
int
diff -up openssh-5.8p1/mac.h.audit4 openssh-5.8p1/mac.h
--- openssh-5.8p1/mac.h.audit4 2007-06-11 06:01:42.000000000 +0200
+++ openssh-5.8p1/mac.h 2011-02-21 18:38:45.000000000 +0100
@@ -28,3 +28,4 @@ int mac_setup(Mac *, char *);
int mac_init(Mac *);
u_char *mac_compute(Mac *, u_int32_t, u_char *, int);
void mac_clear(Mac *);
+void mac_destroy(Mac *);
diff -up openssh-5.8p1/monitor.c.audit4 openssh-5.8p1/monitor.c
--- openssh-5.8p1/monitor.c.audit4 2011-02-21 18:38:45.000000000 +0100
+++ openssh-5.8p1/monitor.c 2011-02-21 18:38:45.000000000 +0100
@@ -180,6 +180,7 @@ int mm_answer_audit_event(int, Buffer *)
int mm_answer_audit_command(int, Buffer *);
int mm_answer_audit_unsupported_body(int, Buffer *);
int mm_answer_audit_kex_body(int, Buffer *);
+int mm_answer_audit_session_key_free_body(int, Buffer *);
#endif
static Authctxt *authctxt;
@@ -230,6 +231,7 @@ struct mon_table mon_dispatch_proto20[]
{MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
{MONITOR_REQ_AUDIT_UNSUPPORTED, MON_PERMIT, mm_answer_audit_unsupported_body},
{MONITOR_REQ_AUDIT_KEX, MON_PERMIT, mm_answer_audit_kex_body},
+ {MONITOR_REQ_AUDIT_SESSION_KEY_FREE, MON_PERMIT, mm_answer_audit_session_key_free_body},
#endif
#ifdef BSD_AUTH
{MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
@@ -268,6 +270,7 @@ struct mon_table mon_dispatch_postauth20
{MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
{MONITOR_REQ_AUDIT_UNSUPPORTED, MON_PERMIT, mm_answer_audit_unsupported_body},
{MONITOR_REQ_AUDIT_KEX, MON_PERMIT, mm_answer_audit_kex_body},
+ {MONITOR_REQ_AUDIT_SESSION_KEY_FREE, MON_PERMIT, mm_answer_audit_session_key_free_body},
#endif
{0, 0, NULL}
};
@@ -301,6 +304,7 @@ struct mon_table mon_dispatch_proto15[]
{MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
{MONITOR_REQ_AUDIT_UNSUPPORTED, MON_PERMIT, mm_answer_audit_unsupported_body},
{MONITOR_REQ_AUDIT_KEX, MON_PERMIT, mm_answer_audit_kex_body},
+ {MONITOR_REQ_AUDIT_SESSION_KEY_FREE, MON_PERMIT, mm_answer_audit_session_key_free_body},
#endif
{0, 0, NULL}
};
@@ -314,6 +318,7 @@ struct mon_table mon_dispatch_postauth15
{MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT|MON_ONCE, mm_answer_audit_command},
{MONITOR_REQ_AUDIT_UNSUPPORTED, MON_PERMIT, mm_answer_audit_unsupported_body},
{MONITOR_REQ_AUDIT_KEX, MON_PERMIT, mm_answer_audit_kex_body},
+ {MONITOR_REQ_AUDIT_SESSION_KEY_FREE, MON_PERMIT, mm_answer_audit_session_key_free_body},
#endif
{0, 0, NULL}
};
@@ -2257,4 +2262,18 @@ mm_answer_audit_kex_body(int sock, Buffe
return 0;
}
+int
+mm_answer_audit_session_key_free_body(int sock, Buffer *m)
+{
+ int ctos;
+
+ ctos = buffer_get_int(m);
+
+ audit_session_key_free_body(ctos);
+
+ buffer_clear(m);
+
+ mm_request_send(sock, MONITOR_ANS_AUDIT_SESSION_KEY_FREE, m);
+ return 0;
+}
#endif /* SSH_AUDIT_EVENTS */
diff -up openssh-5.8p1/monitor.h.audit4 openssh-5.8p1/monitor.h
--- openssh-5.8p1/monitor.h.audit4 2011-02-21 18:38:45.000000000 +0100
+++ openssh-5.8p1/monitor.h 2011-02-21 18:38:45.000000000 +0100
@@ -68,6 +68,7 @@ enum monitor_reqtype {
MONITOR_REQ_JPAKE_CHECK_CONFIRM, MONITOR_ANS_JPAKE_CHECK_CONFIRM,
MONITOR_REQ_AUDIT_UNSUPPORTED, MONITOR_ANS_AUDIT_UNSUPPORTED,
MONITOR_REQ_AUDIT_KEX, MONITOR_ANS_AUDIT_KEX,
+ MONITOR_REQ_AUDIT_SESSION_KEY_FREE, MONITOR_ANS_AUDIT_SESSION_KEY_FREE,
};
struct mm_master;
diff -up openssh-5.8p1/monitor_wrap.c.audit4 openssh-5.8p1/monitor_wrap.c
--- openssh-5.8p1/monitor_wrap.c.audit4 2011-02-21 18:38:45.000000000 +0100
+++ openssh-5.8p1/monitor_wrap.c 2011-02-21 18:38:45.000000000 +0100
@@ -1449,4 +1449,17 @@ mm_audit_kex_body(int ctos, char *cipher
buffer_free(&m);
}
+
+void
+mm_audit_session_key_free_body(int ctos)
+{
+ Buffer m;
+
+ buffer_init(&m);
+ buffer_put_int(&m, ctos);
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_SESSION_KEY_FREE, &m);
+ mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUDIT_SESSION_KEY_FREE,
+ &m);
+ buffer_free(&m);
+}
#endif /* SSH_AUDIT_EVENTS */
diff -up openssh-5.8p1/monitor_wrap.h.audit4 openssh-5.8p1/monitor_wrap.h
--- openssh-5.8p1/monitor_wrap.h.audit4 2011-02-21 18:38:45.000000000 +0100
+++ openssh-5.8p1/monitor_wrap.h 2011-02-21 18:39:26.000000000 +0100
@@ -76,6 +76,7 @@ void mm_audit_event(ssh_audit_event_t);
void mm_audit_run_command(const char *);
void mm_audit_unsupported_body(int);
void mm_audit_kex_body(int, char *, char *, char *, pid_t, uid_t);
+void mm_audit_session_key_free_body(int);
#endif
struct Session;
diff -up openssh-5.8p1/packet.c.audit4 openssh-5.8p1/packet.c
--- openssh-5.8p1/packet.c.audit4 2010-11-24 00:46:37.000000000 +0100
+++ openssh-5.8p1/packet.c 2011-02-21 18:38:45.000000000 +0100
@@ -497,6 +497,7 @@ packet_close(void)
}
cipher_cleanup(&active_state->send_context);
cipher_cleanup(&active_state->receive_context);
+ audit_session_key_free(2);
}
/* Sets remote side protocol flags. */
@@ -756,6 +757,7 @@ set_newkeys(int mode)
}
if (active_state->newkeys[mode] != NULL) {
debug("set_newkeys: rekeying");
+ audit_session_key_free(mode);
cipher_cleanup(cc);
enc = &active_state->newkeys[mode]->enc;
mac = &active_state->newkeys[mode]->mac;
@@ -1912,6 +1914,34 @@ packet_get_newkeys(int mode)
return (void *)active_state->newkeys[mode];
}
+static void
+packet_destroy_state(struct session_state *state)
+{
+ if (state == NULL)
+ return;
+
+ cipher_cleanup(&state->receive_context);
+ cipher_cleanup(&state->send_context);
+
+ buffer_free(&state->input);
+ buffer_free(&state->output);
+ buffer_free(&state->outgoing_packet);
+ buffer_free(&state->incoming_packet);
+ buffer_free(&state->compression_buffer);
+ newkeys_destroy(state->newkeys[MODE_IN]);
+ newkeys_destroy(state->newkeys[MODE_OUT]);
+ mac_destroy(state->packet_discard_mac);
+// TAILQ_HEAD(, packet) outgoing;
+// memset(state, 0, sizeof(state));
+}
+
+void
+packet_destroy_all(void)
+{
+ packet_destroy_state(active_state);
+ packet_destroy_state(backup_state);
+}
+
/*
* Save the state for the real connection, and use a separate state when
* resuming a suspended connection.
@@ -1919,18 +1949,12 @@ packet_get_newkeys(int mode)
void
packet_backup_state(void)
{
- struct session_state *tmp;
-
close(active_state->connection_in);
active_state->connection_in = -1;
close(active_state->connection_out);
active_state->connection_out = -1;
- if (backup_state)
- tmp = backup_state;
- else
- tmp = alloc_session_state();
backup_state = active_state;
- active_state = tmp;
+ active_state = alloc_session_state();
}
/*
@@ -1947,9 +1971,7 @@ packet_restore_state(void)
backup_state = active_state;
active_state = tmp;
active_state->connection_in = backup_state->connection_in;
- backup_state->connection_in = -1;
active_state->connection_out = backup_state->connection_out;
- backup_state->connection_out = -1;
len = buffer_len(&backup_state->input);
if (len > 0) {
buf = buffer_ptr(&backup_state->input);
@@ -1957,4 +1979,10 @@ packet_restore_state(void)
buffer_clear(&backup_state->input);
add_recv_bytes(len);
}
+ backup_state->connection_in = -1;
+ backup_state->connection_out = -1;
+ packet_destroy_state(backup_state);
+ xfree(backup_state);
+ backup_state = NULL;
}
+
diff -up openssh-5.8p1/packet.h.audit4 openssh-5.8p1/packet.h
--- openssh-5.8p1/packet.h.audit4 2010-11-20 05:19:38.000000000 +0100
+++ openssh-5.8p1/packet.h 2011-02-21 18:38:45.000000000 +0100
@@ -125,4 +125,5 @@ void packet_restore_state(void);
void *packet_get_input(void);
void *packet_get_output(void);
+void packet_destroy_all(void);
#endif /* PACKET_H */
diff -up openssh-5.8p1/sshd.c.audit4 openssh-5.8p1/sshd.c
--- openssh-5.8p1/sshd.c.audit4 2011-02-21 18:38:45.000000000 +0100
+++ openssh-5.8p1/sshd.c 2011-02-21 18:38:45.000000000 +0100
@@ -663,6 +663,8 @@ privsep_preauth(Authctxt *authctxt)
return (0);
}
+extern Newkeys *current_keys[];
+
static void
privsep_postauth(Authctxt *authctxt)
{
@@ -688,6 +690,10 @@ privsep_postauth(Authctxt *authctxt)
verbose("User child is on pid %ld", (long)pmonitor->m_pid);
close(pmonitor->m_recvfd);
buffer_clear(&loginmsg);
+ newkeys_destroy(current_keys[MODE_OUT]);
+ newkeys_destroy(current_keys[MODE_IN]);
+ packet_destroy_all();
+ audit_session_key_free_body(2);
monitor_child_postauth(pmonitor);
/* NEVERREACHED */
@@ -1974,6 +1980,8 @@ main(int ac, char **av)
*/
if (use_privsep) {
mm_send_keystate(pmonitor);
+ packet_destroy_all();
+ audit_session_key_free(2);
exit(0);
}
@@ -2026,6 +2034,9 @@ main(int ac, char **av)
do_authenticated(authctxt);
/* The connection has been terminated. */
+ packet_destroy_all();
+ audit_session_key_free(2);
+
packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
verbose("Transferred: sent %llu, received %llu bytes",
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