openssh/openssh-5.8p1-audit5.patch

diff -up openssh-5.8p1/audit-bsm.c.audit5 openssh-5.8p1/audit-bsm.c
--- openssh-5.8p1/audit-bsm.c.audit5	2011-02-21 18:54:03.000000000 +0100
+++ openssh-5.8p1/audit-bsm.c	2011-02-21 18:54:03.000000000 +0100
@@ -401,4 +401,10 @@ audit_session_key_free_body(int ctos, pi
 {
 	/* not implemented */
 }
+
+void
+audit_destroy_sensitive_data(const char *fp)
+{
+	/* not implemented */
+}
 #endif /* BSM */
diff -up openssh-5.8p1/audit.c.audit5 openssh-5.8p1/audit.c
--- openssh-5.8p1/audit.c.audit5	2011-02-21 18:54:03.000000000 +0100
+++ openssh-5.8p1/audit.c	2011-02-21 18:54:03.000000000 +0100
@@ -263,5 +263,14 @@ audit_session_key_free_body(int ctos, pi
 	debug("audit session key discard euid %u direction %d from pid %ld uid %u",
 		(unsigned)geteuid(), ctos, (long)pid, (unsigned)uid);
 }
+
+/*
+ * This will be called on destroy private part of the server key
+ */
+void
+audit_destroy_sensitive_data(const char *fp)
+{
+	debug("audit destroy sensitive data euid %d fingerprint %s", geteuid(), fp);
+}
 # endif  /* !defined CUSTOM_SSH_AUDIT_EVENTS */
 #endif /* SSH_AUDIT_EVENTS */
diff -up openssh-5.8p1/audit.h.audit5 openssh-5.8p1/audit.h
--- openssh-5.8p1/audit.h.audit5	2011-02-21 18:54:03.000000000 +0100
+++ openssh-5.8p1/audit.h	2011-02-21 18:54:03.000000000 +0100
@@ -62,5 +62,6 @@ 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, pid_t, uid_t);
+void	audit_destroy_sensitive_data(const char *);
 
 #endif /* _SSH_AUDIT_H */
diff -up openssh-5.8p1/audit-linux.c.audit5 openssh-5.8p1/audit-linux.c
--- openssh-5.8p1/audit-linux.c.audit5	2011-02-21 18:54:03.000000000 +0100
+++ openssh-5.8p1/audit-linux.c	2011-02-21 18:54:03.000000000 +0100
@@ -324,4 +324,26 @@ audit_session_key_free_body(int ctos, pi
 		error("cannot write into audit");
 }
 
+void
+audit_destroy_sensitive_data(const char *fp)
+{
+	char buf[AUDIT_LOG_SIZE];
+	int audit_fd, audit_ok;
+
+	snprintf(buf, sizeof(buf), "op=destroy kind=server fp=%s direction=?", fp);
+	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/monitor.c.audit5 openssh-5.8p1/monitor.c
--- openssh-5.8p1/monitor.c.audit5	2011-02-21 18:54:03.000000000 +0100
+++ openssh-5.8p1/monitor.c	2011-02-21 18:54:03.000000000 +0100
@@ -181,6 +181,7 @@ 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 *);
+int mm_answer_audit_server_key_free(int, Buffer *);
 #endif
 
 static Authctxt *authctxt;
@@ -232,6 +233,7 @@ struct mon_table mon_dispatch_proto20[] 
     {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},
+    {MONITOR_REQ_AUDIT_SERVER_KEY_FREE, MON_PERMIT, mm_answer_audit_server_key_free},
 #endif
 #ifdef BSD_AUTH
     {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
@@ -271,6 +273,7 @@ struct mon_table mon_dispatch_postauth20
     {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},
+    {MONITOR_REQ_AUDIT_SERVER_KEY_FREE, MON_PERMIT, mm_answer_audit_server_key_free},
 #endif
     {0, 0, NULL}
 };
@@ -305,6 +308,7 @@ struct mon_table mon_dispatch_proto15[] 
     {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},
+    {MONITOR_REQ_AUDIT_SERVER_KEY_FREE, MON_PERMIT, mm_answer_audit_server_key_free},
 #endif
     {0, 0, NULL}
 };
@@ -319,6 +323,7 @@ struct mon_table mon_dispatch_postauth15
     {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},
+    {MONITOR_REQ_AUDIT_SERVER_KEY_FREE, MON_PERMIT, mm_answer_audit_server_key_free},
 #endif
     {0, 0, NULL}
 };
@@ -2280,4 +2285,20 @@ mm_answer_audit_session_key_free_body(in
 	mm_request_send(sock, MONITOR_ANS_AUDIT_SESSION_KEY_FREE, m);
 	return 0;
 }
+
+int
+mm_answer_audit_server_key_free(int sock, Buffer *m)
+{
+	int len;
+	char *fp;
+
+	fp = buffer_get_string(m, &len);
+
+	audit_destroy_sensitive_data(fp);
+
+	buffer_clear(m);
+
+	mm_request_send(sock, MONITOR_ANS_AUDIT_SERVER_KEY_FREE, m);
+	return 0;
+}
 #endif /* SSH_AUDIT_EVENTS */
diff -up openssh-5.8p1/monitor.h.audit5 openssh-5.8p1/monitor.h
--- openssh-5.8p1/monitor.h.audit5	2011-02-21 18:54:03.000000000 +0100
+++ openssh-5.8p1/monitor.h	2011-02-21 18:54:03.000000000 +0100
@@ -69,6 +69,7 @@ enum monitor_reqtype {
 	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,
+	MONITOR_REQ_AUDIT_SERVER_KEY_FREE, MONITOR_ANS_AUDIT_SERVER_KEY_FREE,
 };
 
 struct mm_master;
diff -up openssh-5.8p1/monitor_wrap.c.audit5 openssh-5.8p1/monitor_wrap.c
--- openssh-5.8p1/monitor_wrap.c.audit5	2011-02-21 18:54:03.000000000 +0100
+++ openssh-5.8p1/monitor_wrap.c	2011-02-21 18:54:03.000000000 +0100
@@ -1464,4 +1464,18 @@ mm_audit_session_key_free_body(int ctos,
 				  &m);
 	buffer_free(&m);
 }
+
+void
+mm_audit_destroy_sensitive_data(const char *fp)
+{
+	Buffer m;
+
+	buffer_init(&m);
+	buffer_put_cstring(&m, fp);
+
+	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_SERVER_KEY_FREE, &m);
+	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUDIT_SERVER_KEY_FREE,
+				  &m);
+	buffer_free(&m);
+}
 #endif /* SSH_AUDIT_EVENTS */
diff -up openssh-5.8p1/monitor_wrap.h.audit5 openssh-5.8p1/monitor_wrap.h
--- openssh-5.8p1/monitor_wrap.h.audit5	2011-02-21 18:54:03.000000000 +0100
+++ openssh-5.8p1/monitor_wrap.h	2011-02-21 18:54:56.000000000 +0100
@@ -77,6 +77,7 @@ 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, pid_t, uid_t);
+void mm_audit_destroy_sensitive_data(const char *);
 #endif
 
 struct Session;
diff -up openssh-5.8p1/session.c.audit5 openssh-5.8p1/session.c
--- openssh-5.8p1/session.c.audit5	2010-12-01 02:02:59.000000000 +0100
+++ openssh-5.8p1/session.c	2011-02-21 18:54:03.000000000 +0100
@@ -132,7 +132,7 @@ extern int log_stderr;
 extern int debug_flag;
 extern u_int utmp_len;
 extern int startup_pipe;
-extern void destroy_sensitive_data(void);
+extern void destroy_sensitive_data(int);
 extern Buffer loginmsg;
 
 /* original command from peer. */
@@ -1614,7 +1614,7 @@ do_child(Session *s, const char *command
 	int r = 0;
 
 	/* remove hostkey from the child's memory */
-	destroy_sensitive_data();
+	destroy_sensitive_data(1);
 
 	/* Force a password change */
 	if (s->authctxt->force_pwchange) {
diff -up openssh-5.8p1/sshd.c.audit5 openssh-5.8p1/sshd.c
--- openssh-5.8p1/sshd.c.audit5	2011-02-21 18:54:03.000000000 +0100
+++ openssh-5.8p1/sshd.c	2011-02-21 18:54:03.000000000 +0100
@@ -253,7 +253,7 @@ Buffer loginmsg;
 struct passwd *privsep_pw = NULL;
 
 /* Prototypes for various functions defined later in this file. */
-void destroy_sensitive_data(void);
+void destroy_sensitive_data(int);
 void demote_sensitive_data(void);
 
 static void do_ssh1_kex(void);
@@ -534,7 +534,7 @@ sshd_exchange_identification(int sock_in
 
 /* Destroy the host and server keys.  They will no longer be needed. */
 void
-destroy_sensitive_data(void)
+destroy_sensitive_data(int privsep)
 {
 	int i;
 
@@ -544,8 +544,16 @@ destroy_sensitive_data(void)
 	}
 	for (i = 0; i < options.num_host_key_files; i++) {
 		if (sensitive_data.host_keys[i]) {
+			char *fp;
+
+			fp = key_fingerprint(sensitive_data.host_keys[i],
+					     FIPS_mode() ? SSH_FP_SHA1 : SSH_FP_MD5, SSH_FP_HEX);
 			key_free(sensitive_data.host_keys[i]);
 			sensitive_data.host_keys[i] = NULL;
+			if (privsep)
+				PRIVSEP(audit_destroy_sensitive_data(fp));
+			else
+				audit_destroy_sensitive_data(fp);
 		}
 		if (sensitive_data.host_certificates[i]) {
 			key_free(sensitive_data.host_certificates[i]);
@@ -571,11 +579,17 @@ demote_sensitive_data(void)
 
 	for (i = 0; i < options.num_host_key_files; i++) {
 		if (sensitive_data.host_keys[i]) {
+			char *fp;
+
+			fp = key_fingerprint(sensitive_data.host_keys[i],
+					     FIPS_mode() ? SSH_FP_SHA1 : SSH_FP_MD5, SSH_FP_HEX);
 			tmp = key_demote(sensitive_data.host_keys[i]);
 			key_free(sensitive_data.host_keys[i]);
 			sensitive_data.host_keys[i] = tmp;
 			if (tmp->type == KEY_RSA1)
 				sensitive_data.ssh1_host_key = tmp;
+			audit_destroy_sensitive_data(fp);
+			xfree(fp);
 		}
 		/* Certs do not need demotion */
 	}
@@ -2024,7 +2038,7 @@ main(int ac, char **av)
 		privsep_postauth(authctxt);
 		/* the monitor process [priv] will not return */
 		if (!compat20)
-			destroy_sensitive_data();
+			destroy_sensitive_data(0);
 	}
 
 	packet_set_timeout(options.client_alive_interval,
@@ -2264,7 +2278,7 @@ do_ssh1_kex(void)
 			session_id[i] = session_key[i] ^ session_key[i + 16];
 	}
 	/* Destroy the private and public keys. No longer. */
-	destroy_sensitive_data();
+	destroy_sensitive_data(0);
 
 	if (use_privsep)
 		mm_ssh1_session_id(session_id);