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upstream: Start the process of splitting sshd into separate

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binaries. This step splits sshd into a listener and a session binary. More
splits are planned.

After this changes, the listener binary will validate the configuration,
load the hostkeys, listen on port 22 and manage MaxStartups only. All
session handling will be performed by a new sshd-session binary that the
listener fork+execs.

This reduces the listener process to the minimum necessary and sets us
up for future work on the sshd-session binary.

feedback/ok markus@ deraadt@

NB. if you're updating via source, please restart sshd after installing,
otherwise you run the risk of locking yourself out.

OpenBSD-Commit-ID: 43c04a1ab96cdbdeb53d2df0125a6d42c5f19934
This commit is contained in:
[email protected]
2024-05-17 14:41:35 +10:00
committed by Damien Miller
parent 1c0d813579
commit 03e3de416e
33 changed files with 2096 additions and 1931 deletions
Download Patch File Download Diff File Expand all files Collapse all files
serverloop.c
+4 -40
View File
@@ -1,4 +1,4 @@
/* $OpenBSD: serverloop.c,v 1.238 2024/04/30 02:14:10 djm Exp $ */
/* $OpenBSD: serverloop.c,v 1.239 2024/05/17 00:30:24 djm Exp $ */
/*
* Author: Tatu Ylonen <[email protected]>
* Copyright (c) 1995 Tatu Ylonen <[email protected]>, Espoo, Finland
@@ -86,44 +86,23 @@ extern ServerOptions options;
/* XXX */
extern Authctxt *the_authctxt;
extern struct sshauthopt *auth_opts;
extern int use_privsep;
static int no_more_sessions = 0; /* Disallow further sessions. */
static volatile sig_atomic_t child_terminated = 0; /* The child has terminated. */
/* Cleanup on signals (!use_privsep case only) */
static volatile sig_atomic_t received_sigterm = 0;
/* prototypes */
static void server_init_dispatch(struct ssh *);
/* requested tunnel forwarding interface(s), shared with session.c */
char *tun_fwd_ifnames = NULL;
/* returns 1 if bind to specified port by specified user is permitted */
static int
bind_permitted(int port, uid_t uid)
{
if (use_privsep)
return 1; /* allow system to decide */
if (port < IPPORT_RESERVED && uid != 0)
return 0;
return 1;
}
static void
sigchld_handler(int sig)
{
child_terminated = 1;
}
static void
sigterm_handler(int sig)
{
received_sigterm = sig;
}
static void
client_alive_check(struct ssh *ssh)
{
@@ -354,12 +333,6 @@ server_loop2(struct ssh *ssh, Authctxt *authctxt)
connection_in = ssh_packet_get_connection_in(ssh);
connection_out = ssh_packet_get_connection_out(ssh);
if (!use_privsep) {
ssh_signal(SIGTERM, sigterm_handler);
ssh_signal(SIGINT, sigterm_handler);
ssh_signal(SIGQUIT, sigterm_handler);
}
server_init_dispatch(ssh);
for (;;) {
@@ -383,12 +356,6 @@ server_loop2(struct ssh *ssh, Authctxt *authctxt)
if (sigprocmask(SIG_SETMASK, &osigset, NULL) == -1)
error_f("osigset sigprocmask: %s", strerror(errno));
if (received_sigterm) {
logit("Exiting on signal %d", (int)received_sigterm);
/* Clean up sessions, utmp, etc. */
cleanup_exit(255);
}
channel_after_poll(ssh, pfd, npfd_active);
if (conn_in_ready &&
process_input(ssh, connection_in) < 0)
@@ -498,7 +465,7 @@ server_request_direct_streamlocal(struct ssh *ssh)
/* XXX fine grained permissions */
if ((options.allow_streamlocal_forwarding & FORWARD_LOCAL) != 0 &&
auth_opts->permit_port_forwarding_flag &&
!options.disable_forwarding && (pw->pw_uid == 0 || use_privsep)) {
!options.disable_forwarding) {
c = channel_connect_to_path(ssh, target,
"[email protected]", "direct-streamlocal");
} else {
@@ -792,9 +759,7 @@ server_input_global_request(int type, u_int32_t seq, struct ssh *ssh)
(options.allow_tcp_forwarding & FORWARD_REMOTE) == 0 ||
!auth_opts->permit_port_forwarding_flag ||
options.disable_forwarding ||
(!want_reply && fwd.listen_port == 0) ||
(fwd.listen_port != 0 &&
!bind_permitted(fwd.listen_port, pw->pw_uid))) {
(!want_reply && fwd.listen_port == 0)) {
success = 0;
ssh_packet_send_debug(ssh, "Server has disabled port forwarding.");
} else {
@@ -827,8 +792,7 @@ server_input_global_request(int type, u_int32_t seq, struct ssh *ssh)
/* check permissions */
if ((options.allow_streamlocal_forwarding & FORWARD_REMOTE) == 0
|| !auth_opts->permit_port_forwarding_flag ||
options.disable_forwarding ||
(pw->pw_uid != 0 && !use_privsep)) {
options.disable_forwarding) {
success = 0;
ssh_packet_send_debug(ssh, "Server has disabled "
"streamlocal forwarding.");