Index: openssh-9.9p1/sshd.c

===================================================================

--- openssh-9.9p1.orig/sshd.c

+++ openssh-9.9p1/sshd.c

@@ -1768,6 +1768,9 @@ main(int ac, char **av)

 		/* Accept a connection and return in a forked child */

 		server_accept_loop(&sock_in, &sock_out,

 		    &newsock, config_s, log_stderr);

+

+		set_log_session_id();  // Set log session ID for this session

+

 	}

 	/* This is the child processing a new connection. */

@@ -1818,3 +1821,4 @@ cleanup_exit(int i)

 {

 	_exit(i);

 }

+

Index: openssh-9.9p1/log.c

===================================================================

--- openssh-9.9p1.orig/log.c

+++ openssh-9.9p1/log.c

@@ -414,25 +414,52 @@ do_log(LogLevel level, int force, const

 		tmp_handler(level, force, fmtbuf, log_handler_ctx);

 		log_handler = tmp_handler;

 	} else if (log_on_stderr) {

-		snprintf(msgbuf, sizeof msgbuf, "%s%s%.*s\r\n",

+		snprintf(msgbuf, sizeof msgbuf, "%s%s%.*s session=%s\r\n",

 		    (log_on_stderr > 1) ? progname : "",

 		    (log_on_stderr > 1) ? ": " : "",

-		    (int)sizeof msgbuf - 3, fmtbuf);

+		    (int)sizeof msgbuf - 3, fmtbuf, get_log_session_id());

 		(void)write(log_stderr_fd, msgbuf, strlen(msgbuf));

 	} else {

 #if defined(HAVE_OPENLOG_R) && defined(SYSLOG_DATA_INIT)

 		openlog_r(progname, LOG_PID, log_facility, &sdata);

-		syslog_r(pri, &sdata, "%.500s", fmtbuf);

+		syslog_r(pri, &sdata, "%.500s session=%s", fmtbuf, get_log_session_id());

 		closelog_r(&sdata);

 #else

 		openlog(progname, LOG_PID, log_facility);

-		syslog(pri, "%.500s", fmtbuf);

+		syslog(pri, "%.500s session=%s", fmtbuf, get_log_session_id());

 		closelog();

 #endif

 	}

 	errno = saved_errno;

 }

+void 

+set_log_session_id()

+{

+        struct timeval tv;

+        char hostname[HOST_NAME_MAX + 1];

+        char session_id[HOST_NAME_MAX + 20];

+        char *s;

+        if (gethostname(hostname, sizeof(hostname)) != 0) {

+                *hostname = '\0';

+        }

+        gettimeofday(&tv, NULL);

+        snprintf(session_id, sizeof(session_id), "%s:%x.%x",

+                 hostname, tv.tv_sec, tv.tv_usec);

+        setenv("LOG_SESSION_ID", session_id, 1);

+}

+

+const char *

+get_log_session_id()

+{

+        const char *id = getenv("LOG_SESSION_ID");

+        if (!id) {

+                 set_log_session_id();

+                 id = getenv("LOG_SESSION_ID");

+        }

+        return id;

+}

+

 void

 sshlog(const char *file, const char *func, int line, int showfunc,

     LogLevel level, const char *suffix, const char *fmt, ...)

@@ -519,3 +546,4 @@ sshlogdirect(LogLevel level, int forced,

 	do_log(level, forced, NULL, fmt, args);

 	va_end(args);

 }

+

Index: openssh-9.9p1/regress/session-id.sh

===================================================================

--- /dev/null

+++ openssh-9.9p1/regress/session-id.sh

@@ -0,0 +1,23 @@

+tid="session id"

+

+start_sshd

+

+${SSH} -F $OBJ/ssh_config somehost true

+if [ $? -ne 0 ]; then

+	fail "ssh connect with failed"

+fi

+

+expected="session=$(hostname)"

+

+# grab the first session ID which will be stable across session

+sessionid=$(grep -m1 $expected $TEST_SSHD_LOGFILE | sed -E 's/.*(session=.*)/\1/')

+

+line_count=$(grep -c $expected $TEST_SSHD_LOGFILE)

+if [ $line_count == "0" ]; then

+	fail "No session ID lines found"

+fi

+

+stable_id_count=$(grep -c $sessionid $TEST_SSHD_LOGFILE)

+if [ $line_count != $stable_id_count ]; then

+	fail 'Mismatching session ids found'

+fi

Index: openssh-9.9p1/log.h

===================================================================

--- openssh-9.9p1.orig/log.h

+++ openssh-9.9p1/log.h

@@ -68,6 +68,9 @@ const char *	log_level_name(LogLevel);

 void	 set_log_handler(log_handler_fn *, void *);

 void	 cleanup_exit(int) __attribute__((noreturn));

+void		set_log_session_id();

+const char *	get_log_session_id();

+

 void	 sshlog(const char *, const char *, int, int,

     LogLevel, const char *, const char *, ...)

     __attribute__((format(printf, 7, 8)));

Index: openssh-9.9p1/session.c

===================================================================

--- openssh-9.9p1.orig/session.c

+++ openssh-9.9p1/session.c

@@ -1242,6 +1242,10 @@ do_setup_env(struct ssh *ssh, Session *s

 		child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",

 		    original_command);

+  /* set LOG_SESSION_ID for child */

+  child_set_env(&env, &envsize, "LOG_SESSION_ID", get_log_session_id());

+  debug("set LOG_SESION_ID to: %s", get_log_session_id());

+

 	if (debug_flag) {

 		/* dump the environment */

 		fprintf(stderr, "Environment:\n");