diff -up openssh-5.8p1/audit-bsm.c.audit4 openssh-5.8p1/audit-bsm.c
--- openssh-5.8p1/audit-bsm.c.audit4	2011-02-17 10:34:25.000000000 +0100
+++ openssh-5.8p1/audit-bsm.c	2011-02-17 10:34:25.000000000 +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	2011-02-17 10:34:25.000000000 +0100
+++ openssh-5.8p1/audit.c	2011-02-17 10:34:25.000000000 +0100
@@ -152,6 +152,12 @@ audit_kex(int ctos, char *enc, char *mac
 	PRIVSEP(audit_kex_body(ctos, enc, mac, comp));
 }
 
+void
+audit_session_key_free(int ctos)
+{
+	PRIVSEP(audit_session_key_free_body(ctos));
+}
+
 # ifndef CUSTOM_SSH_AUDIT_EVENTS
 /*
  * Null implementations of audit functions.
@@ -254,5 +260,13 @@ audit_kex_body(int ctos, char *enc, char
 	debug("audit procol negotiation euid %d direction %d cipher %s mac %s compresion %s",
 		geteuid(), ctos, enc, mac, compress);
 }
+
+/*
+ * This will be called on succesfull session key discard
+ */
+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	2011-02-17 10:34:25.000000000 +0100
+++ openssh-5.8p1/audit.h	2011-02-17 10:34:25.000000000 +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 *);
+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	2011-02-17 10:34:25.000000000 +0100
+++ openssh-5.8p1/audit-linux.c	2011-02-17 10:34:25.000000000 +0100
@@ -246,13 +246,14 @@ 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)
 {
 #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 rport=%d laddr=%s lport=%d",
@@ -275,4 +276,29 @@ 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	2011-02-17 10:34:25.000000000 +0100
+++ openssh-5.8p1/auditstub.c	2011-02-17 10:34:25.000000000 +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	2011-02-17 10:34:25.000000000 +0100
+++ openssh-5.8p1/kex.c	2011-02-17 10:34:25.000000000 +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	2011-02-17 10:34:25.000000000 +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	2011-02-17 10:34:25.000000000 +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	2011-02-17 10:34:25.000000000 +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	2011-02-17 10:34:25.000000000 +0100
+++ openssh-5.8p1/monitor.c	2011-02-17 10:34:25.000000000 +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}
 };
@@ -2253,4 +2258,18 @@ 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	2011-02-17 10:34:25.000000000 +0100
+++ openssh-5.8p1/monitor.h	2011-02-17 10:34:25.000000000 +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	2011-02-17 10:34:25.000000000 +0100
+++ openssh-5.8p1/monitor_wrap.c	2011-02-17 10:34:25.000000000 +0100
@@ -1446,4 +1446,17 @@ 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	2011-02-17 10:34:25.000000000 +0100
+++ openssh-5.8p1/monitor_wrap.h	2011-02-17 10:34:25.000000000 +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 *);
+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	2011-02-17 10:34:25.000000000 +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	2011-02-17 10:34:25.000000000 +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	2011-02-17 10:34:25.000000000 +0100
+++ openssh-5.8p1/sshd.c	2011-02-17 10:34:25.000000000 +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",