diff -up openssh-6.6p1/monitor_wrap.c.audit-race openssh-6.6p1/monitor_wrap.c
--- openssh-6.6p1/monitor_wrap.c.audit-race 2016-02-23 13:43:59.958203930 +0100
+++ openssh-6.6p1/monitor_wrap.c 2016-02-23 13:43:59.959203930 +0100
@@ -1456,4 +1456,31 @@ mm_audit_destroy_sensitive_data(const ch
mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_SERVER_KEY_FREE, &m);
buffer_free(&m);
}
+
+int mm_forward_audit_messages(int fdin)
+{
+ static char fb[256];
+ size_t fblen;
+ do {
+ fblen = atomicio(read, fdin, fb, sizeof(fb));
+ if (fblen == 0) {
+ // atomicio read returns EPIPE also with EOF
+ if (errno != EPIPE) {
+ error("%s: Failed to read the messages from child", __func__);
+ return -1;
+ }
+ return 0;
+ }
+ fblen = atomicio(vwrite, pmonitor->m_recvfd, fb, fblen);
+ if (fblen == 0 && errno != EPIPE) {
+ error("%s: Failed to pass the messages to the monitor", __func__);
+ return -1;
+ }
+ } while(fblen > 0);
+ return 0;
+}
+void mm_set_monitor_pipe(int fd)
+{
+ pmonitor->m_recvfd = fd;
+}
#endif /* SSH_AUDIT_EVENTS */
diff -up openssh-6.6p1/monitor_wrap.h.audit-race openssh-6.6p1/monitor_wrap.h
--- openssh-6.6p1/monitor_wrap.h.audit-race 2016-02-23 13:43:59.958203930 +0100
+++ openssh-6.6p1/monitor_wrap.h 2016-02-23 13:43:59.959203930 +0100
@@ -86,6 +86,8 @@ void mm_audit_unsupported_body(int);
void mm_audit_kex_body(int, char *, 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 *, pid_t, uid_t);
+int mm_forward_audit_messages(int);
+void mm_set_monitor_pipe(int);
#endif
struct Session;
diff -up openssh-6.6p1/session.c.audit-race openssh-6.6p1/session.c
--- openssh-6.6p1/session.c.audit-race 2016-02-23 13:43:59.954203931 +0100
+++ openssh-6.6p1/session.c 2016-02-23 13:45:14.758194058 +0100
@@ -158,6 +159,10 @@ static Session *sessions = NULL;
login_cap_t *lc;
#endif
+#ifdef SSH_AUDIT_EVENTS
+int paudit[2];
+#endif
+
static int is_child = 0;
static int have_dev_log = 1;
@@ -891,6 +896,8 @@ do_exec(Session *s, const char *command)
}
if (s->command != NULL && s->ptyfd == -1)
s->command_handle = PRIVSEP(audit_run_command(s->command));
+ if (pipe(paudit) < 0)
+ fatal("pipe: %s", strerror(errno));
#endif
if (s->ttyfd != -1)
ret = do_exec_pty(s, command);
@@ -906,6 +913,20 @@ do_exec(Session *s, const char *command)
*/
buffer_clear(&loginmsg);
+#ifdef SSH_AUDIT_EVENTS
+ close(paudit[1]);
+ if (use_privsep && ret == 0) {
+ /*
+ * Read the audit messages from forked child and send them
+ * back to monitor. We don't want to communicate directly,
+ * because the messages might get mixed up.
+ * Continue after the pipe gets closed (all messages sent).
+ */
+ ret = mm_forward_audit_messages(paudit[0]);
+ }
+ close(paudit[0]);
+#endif /* SSH_AUDIT_EVENTS */
+
return ret;
}
@@ -1718,12 +1739,27 @@ do_child(Session *s, const char *command
struct passwd *pw = s->pw;
int r = 0;
+#ifdef SSH_AUDIT_EVENTS
+ close(paudit[0]);
+ /* Hack the monitor pipe to avoid race condition with parent */
+ if (use_privsep)
+ mm_set_monitor_pipe(paudit[1]);
+#endif
+
/* remove hostkey from the child's memory */
- destroy_sensitive_data(1);
- /* Don't audit this - both us and the parent would be talking to the
- monitor over a single socket, with no synchronization. */
+ destroy_sensitive_data(use_privsep);
+ /*
+ * We can audit this, because we hacked the pipe to direct the
+ * messages over postauth child. But this message requires answer
+ * which we can't do using one-way pipe.
+ */
packet_destroy_all(0, 1);
+#ifdef SSH_AUDIT_EVENTS
+ /* Notify parent that we are done */
+ close(paudit[1]);
+#endif
+
/* Force a password change */
if (s->authctxt->force_pwchange) {
do_setusercontext(pw);