1 /* $OpenBSD: session.c,v 1.282 2016/03/10 11:47:57 djm Exp $ */
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
6 * As far as I am concerned, the code I have written for this software
7 * can be used freely for any purpose. Any derived versions of this
8 * software must be clearly marked as such, and if the derived work is
9 * incompatible with the protocol description in the RFC file, it must be
10 * called by a name other than "ssh" or "Secure Shell".
12 * SSH2 support by Markus Friedl.
13 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38 #include <sys/types.h>
39 #include <sys/param.h>
40 #ifdef HAVE_SYS_STAT_H
41 # include <sys/stat.h>
43 #include <sys/socket.h>
47 #include <arpa/inet.h>
66 #include "openbsd-compat/sys-queue.h"
85 #include "auth-options.h"
87 #include "pathnames.h"
92 #include "serverloop.h"
96 #include "monitor_wrap.h"
99 #if defined(KRB5) && defined(USE_AFS)
104 #include <selinux/selinux.h>
107 #define IS_INTERNAL_SFTP(c) \
108 (!strncmp(c, INTERNAL_SFTP_NAME, sizeof(INTERNAL_SFTP_NAME) - 1) && \
109 (c[sizeof(INTERNAL_SFTP_NAME) - 1] == '\0' || \
110 c[sizeof(INTERNAL_SFTP_NAME) - 1] == ' ' || \
111 c[sizeof(INTERNAL_SFTP_NAME) - 1] == '\t'))
115 Session
*session_new(void);
116 void session_set_fds(Session
*, int, int, int, int, int);
117 void session_pty_cleanup(Session
*);
118 void session_proctitle(Session
*);
119 int session_setup_x11fwd(Session
*);
120 int do_exec_pty(Session
*, const char *);
121 int do_exec_no_pty(Session
*, const char *);
122 int do_exec(Session
*, const char *);
123 void do_login(Session
*, const char *);
124 #ifdef LOGIN_NEEDS_UTMPX
125 static void do_pre_login(Session
*s
);
127 void do_child(Session
*, const char *);
129 int check_quietlogin(Session
*, const char *);
131 static void do_authenticated1(Authctxt
*);
132 static void do_authenticated2(Authctxt
*);
134 static int session_pty_req(Session
*);
137 extern ServerOptions options
;
138 extern char *__progname
;
139 extern int log_stderr
;
140 extern int debug_flag
;
141 extern u_int utmp_len
;
142 extern int startup_pipe
;
143 extern void destroy_sensitive_data(void);
144 extern Buffer loginmsg
;
146 /* original command from peer. */
147 const char *original_command
= NULL
;
150 static int sessions_first_unused
= -1;
151 static int sessions_nalloc
= 0;
152 static Session
*sessions
= NULL
;
154 #define SUBSYSTEM_NONE 0
155 #define SUBSYSTEM_EXT 1
156 #define SUBSYSTEM_INT_SFTP 2
157 #define SUBSYSTEM_INT_SFTP_ERROR 3
159 #ifdef HAVE_LOGIN_CAP
163 static int is_child
= 0;
164 static int in_chroot
= 0;
166 /* Name and directory of socket for authentication agent forwarding. */
167 static char *auth_sock_name
= NULL
;
168 static char *auth_sock_dir
= NULL
;
170 /* removes the agent forwarding socket */
173 auth_sock_cleanup_proc(struct passwd
*pw
)
175 if (auth_sock_name
!= NULL
) {
176 temporarily_use_uid(pw
);
177 unlink(auth_sock_name
);
178 rmdir(auth_sock_dir
);
179 auth_sock_name
= NULL
;
185 auth_input_request_forwarding(struct passwd
* pw
)
190 if (auth_sock_name
!= NULL
) {
191 error("authentication forwarding requested twice.");
195 /* Temporarily drop privileged uid for mkdir/bind. */
196 temporarily_use_uid(pw
);
198 /* Allocate a buffer for the socket name, and format the name. */
199 auth_sock_dir
= xstrdup("/tmp/ssh-XXXXXXXXXX");
201 /* Create private directory for socket */
202 if (mkdtemp(auth_sock_dir
) == NULL
) {
203 packet_send_debug("Agent forwarding disabled: "
204 "mkdtemp() failed: %.100s", strerror(errno
));
207 auth_sock_dir
= NULL
;
211 xasprintf(&auth_sock_name
, "%s/agent.%ld",
212 auth_sock_dir
, (long) getpid());
214 /* Start a Unix listener on auth_sock_name. */
215 sock
= unix_listener(auth_sock_name
, SSH_LISTEN_BACKLOG
, 0);
217 /* Restore the privileged uid. */
220 /* Check for socket/bind/listen failure. */
224 /* Allocate a channel for the authentication agent socket. */
225 nc
= channel_new("auth socket",
226 SSH_CHANNEL_AUTH_SOCKET
, sock
, sock
, -1,
227 CHAN_X11_WINDOW_DEFAULT
, CHAN_X11_PACKET_DEFAULT
,
228 0, "auth socket", 1);
229 nc
->path
= xstrdup(auth_sock_name
);
233 free(auth_sock_name
);
234 if (auth_sock_dir
!= NULL
) {
235 rmdir(auth_sock_dir
);
240 auth_sock_name
= NULL
;
241 auth_sock_dir
= NULL
;
246 display_loginmsg(void)
248 if (buffer_len(&loginmsg
) > 0) {
249 buffer_append(&loginmsg
, "\0", 1);
250 printf("%s", (char *)buffer_ptr(&loginmsg
));
251 buffer_clear(&loginmsg
);
256 do_authenticated(Authctxt
*authctxt
)
258 setproctitle("%s", authctxt
->pw
->pw_name
);
260 /* setup the channel layer */
261 /* XXX - streamlocal? */
262 if (no_port_forwarding_flag
||
263 (options
.allow_tcp_forwarding
& FORWARD_LOCAL
) == 0)
264 channel_disable_adm_local_opens();
266 channel_permit_all_opens();
271 do_authenticated2(authctxt
);
273 do_authenticated1(authctxt
);
275 do_cleanup(authctxt
);
278 /* Check untrusted xauth strings for metacharacters */
280 xauth_valid_string(const char *s
)
284 for (i
= 0; s
[i
] != '\0'; i
++) {
285 if (!isalnum((u_char
)s
[i
]) &&
286 s
[i
] != '.' && s
[i
] != ':' && s
[i
] != '/' &&
287 s
[i
] != '-' && s
[i
] != '_')
294 * Prepares for an interactive session. This is called after the user has
295 * been successfully authenticated. During this message exchange, pseudo
296 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
297 * are requested, etc.
300 do_authenticated1(Authctxt
*authctxt
)
304 int success
, type
, screen_flag
;
305 int enable_compression_after_reply
= 0;
306 u_int proto_len
, data_len
, dlen
, compression_level
= 0;
310 error("no more sessions");
313 s
->authctxt
= authctxt
;
314 s
->pw
= authctxt
->pw
;
317 * We stay in this loop until the client requests to execute a shell
323 /* Get a packet from the client. */
324 type
= packet_read();
326 /* Process the packet. */
328 case SSH_CMSG_REQUEST_COMPRESSION
:
329 compression_level
= packet_get_int();
331 if (compression_level
< 1 || compression_level
> 9) {
332 packet_send_debug("Received invalid compression level %d.",
336 if (options
.compression
== COMP_NONE
) {
337 debug2("compression disabled");
340 /* Enable compression after we have responded with SUCCESS. */
341 enable_compression_after_reply
= 1;
345 case SSH_CMSG_REQUEST_PTY
:
346 success
= session_pty_req(s
);
349 case SSH_CMSG_X11_REQUEST_FORWARDING
:
350 s
->auth_proto
= packet_get_string(&proto_len
);
351 s
->auth_data
= packet_get_string(&data_len
);
353 screen_flag
= packet_get_protocol_flags() &
354 SSH_PROTOFLAG_SCREEN_NUMBER
;
355 debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag
);
357 if (packet_remaining() == 4) {
359 debug2("Buggy client: "
360 "X11 screen flag missing");
361 s
->screen
= packet_get_int();
366 if (xauth_valid_string(s
->auth_proto
) &&
367 xauth_valid_string(s
->auth_data
))
368 success
= session_setup_x11fwd(s
);
371 error("Invalid X11 forwarding data");
376 s
->auth_proto
= NULL
;
381 case SSH_CMSG_AGENT_REQUEST_FORWARDING
:
382 if (!options
.allow_agent_forwarding
||
383 no_agent_forwarding_flag
|| compat13
) {
384 debug("Authentication agent forwarding not permitted for this authentication.");
387 debug("Received authentication agent forwarding request.");
388 success
= auth_input_request_forwarding(s
->pw
);
391 case SSH_CMSG_PORT_FORWARD_REQUEST
:
392 if (no_port_forwarding_flag
) {
393 debug("Port forwarding not permitted for this authentication.");
396 if (!(options
.allow_tcp_forwarding
& FORWARD_REMOTE
)) {
397 debug("Port forwarding not permitted.");
400 debug("Received TCP/IP port forwarding request.");
401 if (channel_input_port_forward_request(s
->pw
->pw_uid
== 0,
402 &options
.fwd_opts
) < 0) {
403 debug("Port forwarding failed.");
409 case SSH_CMSG_MAX_PACKET_SIZE
:
410 if (packet_set_maxsize(packet_get_int()) > 0)
414 case SSH_CMSG_EXEC_SHELL
:
415 case SSH_CMSG_EXEC_CMD
:
416 if (type
== SSH_CMSG_EXEC_CMD
) {
417 command
= packet_get_string(&dlen
);
418 debug("Exec command '%.500s'", command
);
419 if (do_exec(s
, command
) != 0)
421 "command execution failed");
424 if (do_exec(s
, NULL
) != 0)
426 "shell execution failed");
434 * Any unknown messages in this phase are ignored,
435 * and a failure message is returned.
437 logit("Unknown packet type received after authentication: %d", type
);
439 packet_start(success
? SSH_SMSG_SUCCESS
: SSH_SMSG_FAILURE
);
443 /* Enable compression now that we have replied if appropriate. */
444 if (enable_compression_after_reply
) {
445 enable_compression_after_reply
= 0;
446 packet_start_compression(compression_level
);
453 * This is called to fork and execute a command when we have no tty. This
454 * will call do_child from the child, and server_loop from the parent after
455 * setting up file descriptors and such.
458 do_exec_no_pty(Session
*s
, const char *command
)
463 int pin
[2], pout
[2], perr
[2];
466 fatal("do_exec_no_pty: no session");
468 /* Allocate pipes for communicating with the program. */
470 error("%s: pipe in: %.100s", __func__
, strerror(errno
));
473 if (pipe(pout
) < 0) {
474 error("%s: pipe out: %.100s", __func__
, strerror(errno
));
479 if (pipe(perr
) < 0) {
480 error("%s: pipe err: %.100s", __func__
,
489 int inout
[2], err
[2];
492 fatal("do_exec_no_pty: no session");
494 /* Uses socket pairs to communicate with the program. */
495 if (socketpair(AF_UNIX
, SOCK_STREAM
, 0, inout
) < 0) {
496 error("%s: socketpair #1: %.100s", __func__
, strerror(errno
));
499 if (socketpair(AF_UNIX
, SOCK_STREAM
, 0, err
) < 0) {
500 error("%s: socketpair #2: %.100s", __func__
,
508 session_proctitle(s
);
510 /* Fork the child. */
511 switch ((pid
= fork())) {
513 error("%s: fork: %.100s", __func__
, strerror(errno
));
531 /* Child. Reinitialize the log since the pid has changed. */
532 log_init(__progname
, options
.log_level
,
533 options
.log_facility
, log_stderr
);
536 * Create a new session and process group since the 4.4BSD
537 * setlogin() affects the entire process group.
540 error("setsid failed: %.100s", strerror(errno
));
544 * Redirect stdin. We close the parent side of the socket
545 * pair, and make the child side the standard input.
548 if (dup2(pin
[0], 0) < 0)
549 perror("dup2 stdin");
552 /* Redirect stdout. */
554 if (dup2(pout
[1], 1) < 0)
555 perror("dup2 stdout");
558 /* Redirect stderr. */
560 if (dup2(perr
[1], 2) < 0)
561 perror("dup2 stderr");
565 * Redirect stdin, stdout, and stderr. Stdin and stdout will
566 * use the same socket, as some programs (particularly rdist)
567 * seem to depend on it.
571 if (dup2(inout
[0], 0) < 0) /* stdin */
572 perror("dup2 stdin");
573 if (dup2(inout
[0], 1) < 0) /* stdout (same as stdin) */
574 perror("dup2 stdout");
576 if (dup2(err
[0], 2) < 0) /* stderr */
577 perror("dup2 stderr");
583 cray_init_job(s
->pw
); /* set up cray jid and tmpdir */
586 /* Do processing for the child (exec command etc). */
587 do_child(s
, command
);
594 signal(WJSIGNAL
, cray_job_termination_handler
);
597 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE
);
601 /* Set interactive/non-interactive mode. */
602 packet_set_interactive(s
->display
!= NULL
,
603 options
.ip_qos_interactive
, options
.ip_qos_bulk
);
606 * Clear loginmsg, since it's the child's responsibility to display
607 * it to the user, otherwise multiple sessions may accumulate
608 * multiple copies of the login messages.
610 buffer_clear(&loginmsg
);
613 /* We are the parent. Close the child sides of the pipes. */
619 session_set_fds(s
, pin
[1], pout
[0], perr
[0],
622 /* Enter the interactive session. */
623 server_loop(pid
, pin
[1], pout
[0], perr
[0]);
624 /* server_loop has closed pin[1], pout[0], and perr[0]. */
627 /* We are the parent. Close the child sides of the socket pairs. */
632 * Enter the interactive session. Note: server_loop must be able to
633 * handle the case that fdin and fdout are the same.
636 session_set_fds(s
, inout
[1], inout
[1], err
[1],
639 server_loop(pid
, inout
[1], inout
[1], err
[1]);
640 /* server_loop has closed inout[1] and err[1]. */
647 * This is called to fork and execute a command when we have a tty. This
648 * will call do_child from the child, and server_loop from the parent after
649 * setting up file descriptors, controlling tty, updating wtmp, utmp,
650 * lastlog, and other such operations.
653 do_exec_pty(Session
*s
, const char *command
)
655 int fdout
, ptyfd
, ttyfd
, ptymaster
;
659 fatal("do_exec_pty: no session");
664 * Create another descriptor of the pty master side for use as the
665 * standard input. We could use the original descriptor, but this
666 * simplifies code in server_loop. The descriptor is bidirectional.
667 * Do this before forking (and cleanup in the child) so as to
668 * detect and gracefully fail out-of-fd conditions.
670 if ((fdout
= dup(ptyfd
)) < 0) {
671 error("%s: dup #1: %s", __func__
, strerror(errno
));
676 /* we keep a reference to the pty master */
677 if ((ptymaster
= dup(ptyfd
)) < 0) {
678 error("%s: dup #2: %s", __func__
, strerror(errno
));
685 /* Fork the child. */
686 switch ((pid
= fork())) {
688 error("%s: fork: %.100s", __func__
, strerror(errno
));
700 /* Child. Reinitialize the log because the pid has changed. */
701 log_init(__progname
, options
.log_level
,
702 options
.log_facility
, log_stderr
);
703 /* Close the master side of the pseudo tty. */
706 /* Make the pseudo tty our controlling tty. */
707 pty_make_controlling_tty(&ttyfd
, s
->tty
);
709 /* Redirect stdin/stdout/stderr from the pseudo tty. */
710 if (dup2(ttyfd
, 0) < 0)
711 error("dup2 stdin: %s", strerror(errno
));
712 if (dup2(ttyfd
, 1) < 0)
713 error("dup2 stdout: %s", strerror(errno
));
714 if (dup2(ttyfd
, 2) < 0)
715 error("dup2 stderr: %s", strerror(errno
));
717 /* Close the extra descriptor for the pseudo tty. */
720 /* record login, etc. similar to login(1) */
722 if (!(options
.use_login
&& command
== NULL
)) {
724 cray_init_job(s
->pw
); /* set up cray jid and tmpdir */
726 do_login(s
, command
);
728 # ifdef LOGIN_NEEDS_UTMPX
734 * Do common processing for the child, such as execing
737 do_child(s
, command
);
744 signal(WJSIGNAL
, cray_job_termination_handler
);
747 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE
);
752 /* Parent. Close the slave side of the pseudo tty. */
755 /* Enter interactive session. */
756 s
->ptymaster
= ptymaster
;
757 packet_set_interactive(1,
758 options
.ip_qos_interactive
, options
.ip_qos_bulk
);
760 session_set_fds(s
, ptyfd
, fdout
, -1, 1, 1);
762 server_loop(pid
, ptyfd
, fdout
, -1);
763 /* server_loop _has_ closed ptyfd and fdout. */
768 #ifdef LOGIN_NEEDS_UTMPX
770 do_pre_login(Session
*s
)
772 struct ssh
*ssh
= active_state
; /* XXX */
774 struct sockaddr_storage from
;
775 pid_t pid
= getpid();
778 * Get IP address of client. If the connection is not a socket, let
779 * the address be 0.0.0.0.
781 memset(&from
, 0, sizeof(from
));
782 fromlen
= sizeof(from
);
783 if (packet_connection_is_on_socket()) {
784 if (getpeername(packet_get_connection_in(),
785 (struct sockaddr
*)&from
, &fromlen
) < 0) {
786 debug("getpeername: %.100s", strerror(errno
));
791 record_utmp_only(pid
, s
->tty
, s
->pw
->pw_name
,
792 session_get_remote_name_or_ip(ssh
, utmp_len
, options
.use_dns
),
793 (struct sockaddr
*)&from
, fromlen
);
798 * This is called to fork and execute a command. If another command is
799 * to be forced, execute that instead.
802 do_exec(Session
*s
, const char *command
)
804 struct ssh
*ssh
= active_state
; /* XXX */
806 const char *forced
= NULL
, *tty
= NULL
;
807 char session_type
[1024];
809 if (options
.adm_forced_command
) {
810 original_command
= command
;
811 command
= options
.adm_forced_command
;
813 } else if (forced_command
) {
814 original_command
= command
;
815 command
= forced_command
;
816 forced
= "(key-option)";
818 if (forced
!= NULL
) {
819 if (IS_INTERNAL_SFTP(command
)) {
820 s
->is_subsystem
= s
->is_subsystem
?
821 SUBSYSTEM_INT_SFTP
: SUBSYSTEM_INT_SFTP_ERROR
;
822 } else if (s
->is_subsystem
)
823 s
->is_subsystem
= SUBSYSTEM_EXT
;
824 snprintf(session_type
, sizeof(session_type
),
825 "forced-command %s '%.900s'", forced
, command
);
826 } else if (s
->is_subsystem
) {
827 snprintf(session_type
, sizeof(session_type
),
828 "subsystem '%.900s'", s
->subsys
);
829 } else if (command
== NULL
) {
830 snprintf(session_type
, sizeof(session_type
), "shell");
832 /* NB. we don't log unforced commands to preserve privacy */
833 snprintf(session_type
, sizeof(session_type
), "command");
836 if (s
->ttyfd
!= -1) {
838 if (strncmp(tty
, "/dev/", 5) == 0)
842 verbose("Starting session: %s%s%s for %s from %.200s port %d id %d",
844 tty
== NULL
? "" : " on ",
845 tty
== NULL
? "" : tty
,
847 ssh_remote_ipaddr(ssh
),
848 ssh_remote_port(ssh
),
851 #ifdef SSH_AUDIT_EVENTS
853 PRIVSEP(audit_run_command(command
));
854 else if (s
->ttyfd
== -1) {
855 char *shell
= s
->pw
->pw_shell
;
857 if (shell
[0] == '\0') /* empty shell means /bin/sh */
859 PRIVSEP(audit_run_command(shell
));
863 ret
= do_exec_pty(s
, command
);
865 ret
= do_exec_no_pty(s
, command
);
867 original_command
= NULL
;
870 * Clear loginmsg: it's the child's responsibility to display
871 * it to the user, otherwise multiple sessions may accumulate
872 * multiple copies of the login messages.
874 buffer_clear(&loginmsg
);
879 /* administrative, login(1)-like work */
881 do_login(Session
*s
, const char *command
)
883 struct ssh
*ssh
= active_state
; /* XXX */
885 struct sockaddr_storage from
;
886 struct passwd
* pw
= s
->pw
;
887 pid_t pid
= getpid();
890 * Get IP address of client. If the connection is not a socket, let
891 * the address be 0.0.0.0.
893 memset(&from
, 0, sizeof(from
));
894 fromlen
= sizeof(from
);
895 if (packet_connection_is_on_socket()) {
896 if (getpeername(packet_get_connection_in(),
897 (struct sockaddr
*)&from
, &fromlen
) < 0) {
898 debug("getpeername: %.100s", strerror(errno
));
903 /* Record that there was a login on that tty from the remote host. */
905 record_login(pid
, s
->tty
, pw
->pw_name
, pw
->pw_uid
,
906 session_get_remote_name_or_ip(ssh
, utmp_len
,
908 (struct sockaddr
*)&from
, fromlen
);
912 * If password change is needed, do it now.
913 * This needs to occur before the ~/.hushlogin check.
915 if (options
.use_pam
&& !use_privsep
&& s
->authctxt
->force_pwchange
) {
918 s
->authctxt
->force_pwchange
= 0;
919 /* XXX - signal [net] parent to enable forwardings */
923 if (check_quietlogin(s
, command
))
932 * Display the message of the day.
940 if (options
.print_motd
) {
941 #ifdef HAVE_LOGIN_CAP
942 f
= fopen(login_getcapstr(lc
, "welcome", "/etc/motd",
945 f
= fopen("/etc/motd", "r");
948 while (fgets(buf
, sizeof(buf
), f
))
957 * Check for quiet login, either .hushlogin or command given.
960 check_quietlogin(Session
*s
, const char *command
)
963 struct passwd
*pw
= s
->pw
;
966 /* Return 1 if .hushlogin exists or a command given. */
969 snprintf(buf
, sizeof(buf
), "%.200s/.hushlogin", pw
->pw_dir
);
970 #ifdef HAVE_LOGIN_CAP
971 if (login_getcapbool(lc
, "hushlogin", 0) || stat(buf
, &st
) >= 0)
974 if (stat(buf
, &st
) >= 0)
981 * Sets the value of the given variable in the environment. If the variable
982 * already exists, its value is overridden.
985 child_set_env(char ***envp
, u_int
*envsizep
, const char *name
,
992 if (strchr(name
, '=') != NULL
) {
993 error("Invalid environment variable \"%.100s\"", name
);
998 * If we're passed an uninitialized list, allocate a single null
999 * entry before continuing.
1001 if (*envp
== NULL
&& *envsizep
== 0) {
1002 *envp
= xmalloc(sizeof(char *));
1008 * Find the slot where the value should be stored. If the variable
1009 * already exists, we reuse the slot; otherwise we append a new slot
1010 * at the end of the array, expanding if necessary.
1013 namelen
= strlen(name
);
1014 for (i
= 0; env
[i
]; i
++)
1015 if (strncmp(env
[i
], name
, namelen
) == 0 && env
[i
][namelen
] == '=')
1018 /* Reuse the slot. */
1021 /* New variable. Expand if necessary. */
1022 envsize
= *envsizep
;
1023 if (i
>= envsize
- 1) {
1024 if (envsize
>= 1000)
1025 fatal("child_set_env: too many env vars");
1027 env
= (*envp
) = xreallocarray(env
, envsize
, sizeof(char *));
1028 *envsizep
= envsize
;
1030 /* Need to set the NULL pointer at end of array beyond the new slot. */
1034 /* Allocate space and format the variable in the appropriate slot. */
1035 env
[i
] = xmalloc(strlen(name
) + 1 + strlen(value
) + 1);
1036 snprintf(env
[i
], strlen(name
) + 1 + strlen(value
) + 1, "%s=%s", name
, value
);
1040 * Reads environment variables from the given file and adds/overrides them
1041 * into the environment. If the file does not exist, this does nothing.
1042 * Otherwise, it must consist of empty lines, comments (line starts with '#')
1043 * and assignments of the form name=value. No other forms are allowed.
1046 read_environment_file(char ***env
, u_int
*envsize
,
1047 const char *filename
)
1054 f
= fopen(filename
, "r");
1058 while (fgets(buf
, sizeof(buf
), f
)) {
1059 if (++lineno
> 1000)
1060 fatal("Too many lines in environment file %s", filename
);
1061 for (cp
= buf
; *cp
== ' ' || *cp
== '\t'; cp
++)
1063 if (!*cp
|| *cp
== '#' || *cp
== '\n')
1066 cp
[strcspn(cp
, "\n")] = '\0';
1068 value
= strchr(cp
, '=');
1069 if (value
== NULL
) {
1070 fprintf(stderr
, "Bad line %u in %.100s\n", lineno
,
1075 * Replace the equals sign by nul, and advance value to
1080 child_set_env(env
, envsize
, cp
, value
);
1085 #ifdef HAVE_ETC_DEFAULT_LOGIN
1087 * Return named variable from specified environment, or NULL if not present.
1090 child_get_env(char **env
, const char *name
)
1096 for (i
=0; env
[i
] != NULL
; i
++)
1097 if (strncmp(name
, env
[i
], len
) == 0 && env
[i
][len
] == '=')
1098 return(env
[i
] + len
+ 1);
1103 * Read /etc/default/login.
1104 * We pick up the PATH (or SUPATH for root) and UMASK.
1107 read_etc_default_login(char ***env
, u_int
*envsize
, uid_t uid
)
1109 char **tmpenv
= NULL
, *var
;
1110 u_int i
, tmpenvsize
= 0;
1114 * We don't want to copy the whole file to the child's environment,
1115 * so we use a temporary environment and copy the variables we're
1118 read_environment_file(&tmpenv
, &tmpenvsize
, "/etc/default/login");
1124 var
= child_get_env(tmpenv
, "SUPATH");
1126 var
= child_get_env(tmpenv
, "PATH");
1128 child_set_env(env
, envsize
, "PATH", var
);
1130 if ((var
= child_get_env(tmpenv
, "UMASK")) != NULL
)
1131 if (sscanf(var
, "%5lo", &mask
) == 1)
1132 umask((mode_t
)mask
);
1134 for (i
= 0; tmpenv
[i
] != NULL
; i
++)
1138 #endif /* HAVE_ETC_DEFAULT_LOGIN */
1141 copy_environment(char **source
, char ***env
, u_int
*envsize
)
1143 char *var_name
, *var_val
;
1149 for(i
= 0; source
[i
] != NULL
; i
++) {
1150 var_name
= xstrdup(source
[i
]);
1151 if ((var_val
= strstr(var_name
, "=")) == NULL
) {
1157 debug3("Copy environment: %s=%s", var_name
, var_val
);
1158 child_set_env(env
, envsize
, var_name
, var_val
);
1165 do_setup_env(Session
*s
, const char *shell
)
1167 struct ssh
*ssh
= active_state
; /* XXX */
1171 struct passwd
*pw
= s
->pw
;
1172 #if !defined (HAVE_LOGIN_CAP) && !defined (HAVE_CYGWIN)
1176 /* Initialize the environment. */
1178 env
= xcalloc(envsize
, sizeof(char *));
1183 * The Windows environment contains some setting which are
1184 * important for a running system. They must not be dropped.
1189 p
= fetch_windows_environment();
1190 copy_environment(p
, &env
, &envsize
);
1191 free_windows_environment(p
);
1196 /* Allow any GSSAPI methods that we've used to alter
1197 * the childs environment as they see fit
1199 ssh_gssapi_do_child(&env
, &envsize
);
1202 if (!options
.use_login
) {
1203 /* Set basic environment. */
1204 for (i
= 0; i
< s
->num_env
; i
++)
1205 child_set_env(&env
, &envsize
, s
->env
[i
].name
,
1208 child_set_env(&env
, &envsize
, "USER", pw
->pw_name
);
1209 child_set_env(&env
, &envsize
, "LOGNAME", pw
->pw_name
);
1211 child_set_env(&env
, &envsize
, "LOGIN", pw
->pw_name
);
1213 child_set_env(&env
, &envsize
, "HOME", pw
->pw_dir
);
1214 #ifdef HAVE_LOGIN_CAP
1215 if (setusercontext(lc
, pw
, pw
->pw_uid
, LOGIN_SETPATH
) < 0)
1216 child_set_env(&env
, &envsize
, "PATH", _PATH_STDPATH
);
1218 child_set_env(&env
, &envsize
, "PATH", getenv("PATH"));
1219 #else /* HAVE_LOGIN_CAP */
1220 # ifndef HAVE_CYGWIN
1222 * There's no standard path on Windows. The path contains
1223 * important components pointing to the system directories,
1224 * needed for loading shared libraries. So the path better
1225 * remains intact here.
1227 # ifdef HAVE_ETC_DEFAULT_LOGIN
1228 read_etc_default_login(&env
, &envsize
, pw
->pw_uid
);
1229 path
= child_get_env(env
, "PATH");
1230 # endif /* HAVE_ETC_DEFAULT_LOGIN */
1231 if (path
== NULL
|| *path
== '\0') {
1232 child_set_env(&env
, &envsize
, "PATH",
1233 s
->pw
->pw_uid
== 0 ?
1234 SUPERUSER_PATH
: _PATH_STDPATH
);
1236 # endif /* HAVE_CYGWIN */
1237 #endif /* HAVE_LOGIN_CAP */
1239 snprintf(buf
, sizeof buf
, "%.200s/%.50s",
1240 _PATH_MAILDIR
, pw
->pw_name
);
1241 child_set_env(&env
, &envsize
, "MAIL", buf
);
1243 /* Normal systems set SHELL by default. */
1244 child_set_env(&env
, &envsize
, "SHELL", shell
);
1247 child_set_env(&env
, &envsize
, "TZ", getenv("TZ"));
1249 /* Set custom environment options from RSA authentication. */
1250 if (!options
.use_login
) {
1251 while (custom_environment
) {
1252 struct envstring
*ce
= custom_environment
;
1255 for (i
= 0; str
[i
] != '=' && str
[i
]; i
++)
1257 if (str
[i
] == '=') {
1259 child_set_env(&env
, &envsize
, str
, str
+ i
+ 1);
1261 custom_environment
= ce
->next
;
1267 /* SSH_CLIENT deprecated */
1268 snprintf(buf
, sizeof buf
, "%.50s %d %d",
1269 ssh_remote_ipaddr(ssh
), ssh_remote_port(ssh
),
1270 ssh_local_port(ssh
));
1271 child_set_env(&env
, &envsize
, "SSH_CLIENT", buf
);
1273 laddr
= get_local_ipaddr(packet_get_connection_in());
1274 snprintf(buf
, sizeof buf
, "%.50s %d %.50s %d",
1275 ssh_remote_ipaddr(ssh
), ssh_remote_port(ssh
),
1276 laddr
, ssh_local_port(ssh
));
1278 child_set_env(&env
, &envsize
, "SSH_CONNECTION", buf
);
1281 child_set_env(&env
, &envsize
, "SSH_TTY", s
->tty
);
1283 child_set_env(&env
, &envsize
, "TERM", s
->term
);
1285 child_set_env(&env
, &envsize
, "DISPLAY", s
->display
);
1286 if (original_command
)
1287 child_set_env(&env
, &envsize
, "SSH_ORIGINAL_COMMAND",
1291 if (cray_tmpdir
[0] != '\0')
1292 child_set_env(&env
, &envsize
, "TMPDIR", cray_tmpdir
);
1293 #endif /* _UNICOS */
1296 * Since we clear KRB5CCNAME at startup, if it's set now then it
1297 * must have been set by a native authentication method (eg AIX or
1298 * SIA), so copy it to the child.
1303 if ((cp
= getenv("KRB5CCNAME")) != NULL
)
1304 child_set_env(&env
, &envsize
, "KRB5CCNAME", cp
);
1311 if ((cp
= getenv("AUTHSTATE")) != NULL
)
1312 child_set_env(&env
, &envsize
, "AUTHSTATE", cp
);
1313 read_environment_file(&env
, &envsize
, "/etc/environment");
1317 if (s
->authctxt
->krb5_ccname
)
1318 child_set_env(&env
, &envsize
, "KRB5CCNAME",
1319 s
->authctxt
->krb5_ccname
);
1323 * Pull in any environment variables that may have
1326 if (options
.use_pam
&& !options
.use_login
) {
1329 p
= fetch_pam_child_environment();
1330 copy_environment(p
, &env
, &envsize
);
1331 free_pam_environment(p
);
1333 p
= fetch_pam_environment();
1334 copy_environment(p
, &env
, &envsize
);
1335 free_pam_environment(p
);
1337 #endif /* USE_PAM */
1339 if (auth_sock_name
!= NULL
)
1340 child_set_env(&env
, &envsize
, SSH_AUTHSOCKET_ENV_NAME
,
1343 /* read $HOME/.ssh/environment. */
1344 if (options
.permit_user_env
&& !options
.use_login
) {
1345 snprintf(buf
, sizeof buf
, "%.200s/.ssh/environment",
1346 strcmp(pw
->pw_dir
, "/") ? pw
->pw_dir
: "");
1347 read_environment_file(&env
, &envsize
, buf
);
1350 /* dump the environment */
1351 fprintf(stderr
, "Environment:\n");
1352 for (i
= 0; env
[i
]; i
++)
1353 fprintf(stderr
, " %.200s\n", env
[i
]);
1359 * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
1360 * first in this order).
1363 do_rc_files(Session
*s
, const char *shell
)
1371 s
->display
!= NULL
&& s
->auth_proto
!= NULL
&& s
->auth_data
!= NULL
;
1373 /* ignore _PATH_SSH_USER_RC for subsystems and admin forced commands */
1374 if (!s
->is_subsystem
&& options
.adm_forced_command
== NULL
&&
1375 !no_user_rc
&& options
.permit_user_rc
&&
1376 stat(_PATH_SSH_USER_RC
, &st
) >= 0) {
1377 snprintf(cmd
, sizeof cmd
, "%s -c '%s %s'",
1378 shell
, _PATH_BSHELL
, _PATH_SSH_USER_RC
);
1380 fprintf(stderr
, "Running %s\n", cmd
);
1381 f
= popen(cmd
, "w");
1384 fprintf(f
, "%s %s\n", s
->auth_proto
,
1388 fprintf(stderr
, "Could not run %s\n",
1390 } else if (stat(_PATH_SSH_SYSTEM_RC
, &st
) >= 0) {
1392 fprintf(stderr
, "Running %s %s\n", _PATH_BSHELL
,
1393 _PATH_SSH_SYSTEM_RC
);
1394 f
= popen(_PATH_BSHELL
" " _PATH_SSH_SYSTEM_RC
, "w");
1397 fprintf(f
, "%s %s\n", s
->auth_proto
,
1401 fprintf(stderr
, "Could not run %s\n",
1402 _PATH_SSH_SYSTEM_RC
);
1403 } else if (do_xauth
&& options
.xauth_location
!= NULL
) {
1404 /* Add authority data to .Xauthority if appropriate. */
1407 "Running %.500s remove %.100s\n",
1408 options
.xauth_location
, s
->auth_display
);
1410 "%.500s add %.100s %.100s %.100s\n",
1411 options
.xauth_location
, s
->auth_display
,
1412 s
->auth_proto
, s
->auth_data
);
1414 snprintf(cmd
, sizeof cmd
, "%s -q -",
1415 options
.xauth_location
);
1416 f
= popen(cmd
, "w");
1418 fprintf(f
, "remove %s\n",
1420 fprintf(f
, "add %s %s %s\n",
1421 s
->auth_display
, s
->auth_proto
,
1425 fprintf(stderr
, "Could not run %s\n",
1432 do_nologin(struct passwd
*pw
)
1435 char buf
[1024], *def_nl
= _PATH_NOLOGIN
;
1439 #ifdef HAVE_LOGIN_CAP
1440 if (login_getcapbool(lc
, "ignorenologin", 0) || pw
->pw_uid
== 0)
1442 nl
= login_getcapstr(lc
, "nologin", def_nl
, def_nl
);
1444 if (pw
->pw_uid
== 0)
1448 if (stat(nl
, &sb
) == -1) {
1450 free(__DECONST(char *, nl
)); /* __DECONST() safe */
1454 /* /etc/nologin exists. Print its contents if we can and exit. */
1455 logit("User %.100s not allowed because %s exists", pw
->pw_name
, nl
);
1456 if ((f
= fopen(nl
, "r")) != NULL
) {
1457 while (fgets(buf
, sizeof(buf
), f
))
1465 * Chroot into a directory after checking it for safety: all path components
1466 * must be root-owned directories with strict permissions.
1469 safely_chroot(const char *path
, uid_t uid
)
1472 char component
[PATH_MAX
];
1476 fatal("chroot path does not begin at root");
1477 if (strlen(path
) >= sizeof(component
))
1478 fatal("chroot path too long");
1481 * Descend the path, checking that each component is a
1482 * root-owned directory with strict permissions.
1484 for (cp
= path
; cp
!= NULL
;) {
1485 if ((cp
= strchr(cp
, '/')) == NULL
)
1486 strlcpy(component
, path
, sizeof(component
));
1489 memcpy(component
, path
, cp
- path
);
1490 component
[cp
- path
] = '\0';
1493 debug3("%s: checking '%s'", __func__
, component
);
1495 if (stat(component
, &st
) != 0)
1496 fatal("%s: stat(\"%s\"): %s", __func__
,
1497 component
, strerror(errno
));
1498 if (st
.st_uid
!= 0 || (st
.st_mode
& 022) != 0)
1499 fatal("bad ownership or modes for chroot "
1500 "directory %s\"%s\"",
1501 cp
== NULL
? "" : "component ", component
);
1502 if (!S_ISDIR(st
.st_mode
))
1503 fatal("chroot path %s\"%s\" is not a directory",
1504 cp
== NULL
? "" : "component ", component
);
1508 if (chdir(path
) == -1)
1509 fatal("Unable to chdir to chroot path \"%s\": "
1510 "%s", path
, strerror(errno
));
1511 if (chroot(path
) == -1)
1512 fatal("chroot(\"%s\"): %s", path
, strerror(errno
));
1513 if (chdir("/") == -1)
1514 fatal("%s: chdir(/) after chroot: %s",
1515 __func__
, strerror(errno
));
1516 verbose("Changed root directory to \"%s\"", path
);
1519 /* Set login name, uid, gid, and groups. */
1521 do_setusercontext(struct passwd
*pw
)
1523 char *chroot_path
, *tmp
;
1525 platform_setusercontext(pw
);
1527 if (platform_privileged_uidswap()) {
1528 #ifdef HAVE_LOGIN_CAP
1529 if (setusercontext(lc
, pw
, pw
->pw_uid
,
1530 (LOGIN_SETALL
& ~(LOGIN_SETPATH
|LOGIN_SETUSER
))) < 0) {
1531 perror("unable to set user context");
1535 if (setlogin(pw
->pw_name
) < 0)
1536 error("setlogin failed: %s", strerror(errno
));
1537 if (setgid(pw
->pw_gid
) < 0) {
1541 /* Initialize the group list. */
1542 if (initgroups(pw
->pw_name
, pw
->pw_gid
) < 0) {
1543 perror("initgroups");
1549 platform_setusercontext_post_groups(pw
);
1551 if (!in_chroot
&& options
.chroot_directory
!= NULL
&&
1552 strcasecmp(options
.chroot_directory
, "none") != 0) {
1553 tmp
= tilde_expand_filename(options
.chroot_directory
,
1555 chroot_path
= percent_expand(tmp
, "h", pw
->pw_dir
,
1556 "u", pw
->pw_name
, (char *)NULL
);
1557 safely_chroot(chroot_path
, pw
->pw_uid
);
1560 /* Make sure we don't attempt to chroot again */
1561 free(options
.chroot_directory
);
1562 options
.chroot_directory
= NULL
;
1566 #ifdef HAVE_LOGIN_CAP
1567 if (setusercontext(lc
, pw
, pw
->pw_uid
, LOGIN_SETUSER
) < 0) {
1568 perror("unable to set user context (setuser)");
1572 * FreeBSD's setusercontext() will not apply the user's
1573 * own umask setting unless running with the user's UID.
1575 (void) setusercontext(lc
, pw
, pw
->pw_uid
, LOGIN_SETUMASK
);
1579 * In a chroot environment, the set_id() will always fail;
1580 * typically because of the lack of necessary authentication
1581 * services and runtime such as ./usr/lib/libiaf.so,
1582 * ./usr/lib/libpam.so.1, and ./etc/passwd We skip it in the
1583 * internal sftp chroot case. We'll lose auditing and ACLs but
1584 * permanently_set_uid will take care of the rest.
1586 if (!in_chroot
&& set_id(pw
->pw_name
) != 0)
1587 fatal("set_id(%s) Failed", pw
->pw_name
);
1588 # endif /* USE_LIBIAF */
1589 /* Permanently switch to the desired uid. */
1590 permanently_set_uid(pw
);
1592 } else if (options
.chroot_directory
!= NULL
&&
1593 strcasecmp(options
.chroot_directory
, "none") != 0) {
1594 fatal("server lacks privileges to chroot to ChrootDirectory");
1597 if (getuid() != pw
->pw_uid
|| geteuid() != pw
->pw_uid
)
1598 fatal("Failed to set uids to %u.", (u_int
) pw
->pw_uid
);
1602 do_pwchange(Session
*s
)
1605 fprintf(stderr
, "WARNING: Your password has expired.\n");
1606 if (s
->ttyfd
!= -1) {
1608 "You must change your password now and login again!\n");
1612 #ifdef PASSWD_NEEDS_USERNAME
1613 execl(_PATH_PASSWD_PROG
, "passwd", s
->pw
->pw_name
,
1616 execl(_PATH_PASSWD_PROG
, "passwd", (char *)NULL
);
1621 "Password change required but no TTY available.\n");
1627 launch_login(struct passwd
*pw
, const char *hostname
)
1629 /* Launch login(1). */
1631 execl(LOGIN_PROGRAM
, "login", "-h", hostname
,
1632 #ifdef xxxLOGIN_NEEDS_TERM
1633 (s
->term
? s
->term
: "unknown"),
1634 #endif /* LOGIN_NEEDS_TERM */
1635 #ifdef LOGIN_NO_ENDOPT
1636 "-p", "-f", pw
->pw_name
, (char *)NULL
);
1638 "-p", "-f", "--", pw
->pw_name
, (char *)NULL
);
1641 /* Login couldn't be executed, die. */
1648 child_close_fds(void)
1650 extern int auth_sock
;
1652 if (auth_sock
!= -1) {
1657 if (packet_get_connection_in() == packet_get_connection_out())
1658 close(packet_get_connection_in());
1660 close(packet_get_connection_in());
1661 close(packet_get_connection_out());
1664 * Close all descriptors related to channels. They will still remain
1665 * open in the parent.
1667 /* XXX better use close-on-exec? -markus */
1668 channel_close_all();
1671 * Close any extra file descriptors. Note that there may still be
1672 * descriptors left by system functions. They will be closed later.
1677 * Close any extra open file descriptors so that we don't have them
1678 * hanging around in clients. Note that we want to do this after
1679 * initgroups, because at least on Solaris 2.3 it leaves file
1682 closefrom(STDERR_FILENO
+ 1);
1686 * Performs common processing for the child, such as setting up the
1687 * environment, closing extra file descriptors, setting the user and group
1688 * ids, and executing the command or shell.
1692 do_child(Session
*s
, const char *command
)
1694 struct ssh
*ssh
= active_state
; /* XXX */
1695 extern char **environ
;
1697 char *argv
[ARGV_MAX
];
1698 const char *shell
, *shell0
, *hostname
= NULL
;
1699 struct passwd
*pw
= s
->pw
;
1702 /* remove hostkey from the child's memory */
1703 destroy_sensitive_data();
1705 /* Force a password change */
1706 if (s
->authctxt
->force_pwchange
) {
1707 do_setusercontext(pw
);
1713 /* login(1) is only called if we execute the login shell */
1714 if (options
.use_login
&& command
!= NULL
)
1715 options
.use_login
= 0;
1718 cray_setup(pw
->pw_uid
, pw
->pw_name
, command
);
1719 #endif /* _UNICOS */
1722 * Login(1) does this as well, and it needs uid 0 for the "-h"
1723 * switch, so we let login(1) to this for us.
1725 if (!options
.use_login
) {
1727 session_setup_sia(pw
, s
->ttyfd
== -1 ? NULL
: s
->tty
);
1728 if (!check_quietlogin(s
, command
))
1730 #else /* HAVE_OSF_SIA */
1731 /* When PAM is enabled we rely on it to do the nologin check */
1732 if (!options
.use_pam
)
1734 do_setusercontext(pw
);
1736 * PAM session modules in do_setusercontext may have
1737 * generated messages, so if this in an interactive
1738 * login then display them too.
1740 if (!check_quietlogin(s
, command
))
1742 #endif /* HAVE_OSF_SIA */
1746 if (options
.use_pam
&& !options
.use_login
&& !is_pam_session_open()) {
1747 debug3("PAM session not opened, exiting");
1754 * Get the shell from the password data. An empty shell field is
1755 * legal, and means /bin/sh.
1757 shell
= (pw
->pw_shell
[0] == '\0') ? _PATH_BSHELL
: pw
->pw_shell
;
1760 * Make sure $SHELL points to the shell from the password file,
1761 * even if shell is overridden from login.conf
1763 env
= do_setup_env(s
, shell
);
1765 #ifdef HAVE_LOGIN_CAP
1766 shell
= login_getcapstr(lc
, "shell", (char *)shell
, (char *)shell
);
1769 /* we have to stash the hostname before we close our socket. */
1770 if (options
.use_login
)
1771 hostname
= session_get_remote_name_or_ip(ssh
, utmp_len
,
1774 * Close the connection descriptors; note that this is the child, and
1775 * the server will still have the socket open, and it is important
1776 * that we do not shutdown it. Note that the descriptors cannot be
1777 * closed before building the environment, as we call
1778 * ssh_remote_ipaddr there.
1783 * Must take new environment into use so that .ssh/rc,
1784 * /etc/ssh/sshrc and xauth are run in the proper environment.
1788 #if defined(KRB5) && defined(USE_AFS)
1790 * At this point, we check to see if AFS is active and if we have
1791 * a valid Kerberos 5 TGT. If so, it seems like a good idea to see
1792 * if we can (and need to) extend the ticket into an AFS token. If
1793 * we don't do this, we run into potential problems if the user's
1794 * home directory is in AFS and it's not world-readable.
1797 if (options
.kerberos_get_afs_token
&& k_hasafs() &&
1798 (s
->authctxt
->krb5_ctx
!= NULL
)) {
1801 debug("Getting AFS token");
1805 if (k_afs_cell_of_file(pw
->pw_dir
, cell
, sizeof(cell
)) == 0)
1806 krb5_afslog(s
->authctxt
->krb5_ctx
,
1807 s
->authctxt
->krb5_fwd_ccache
, cell
, NULL
);
1809 krb5_afslog_home(s
->authctxt
->krb5_ctx
,
1810 s
->authctxt
->krb5_fwd_ccache
, NULL
, NULL
, pw
->pw_dir
);
1814 /* Change current directory to the user's home directory. */
1815 if (chdir(pw
->pw_dir
) < 0) {
1816 /* Suppress missing homedir warning for chroot case */
1817 #ifdef HAVE_LOGIN_CAP
1818 r
= login_getcapbool(lc
, "requirehome", 0);
1820 if (r
|| !in_chroot
) {
1821 fprintf(stderr
, "Could not chdir to home "
1822 "directory %s: %s\n", pw
->pw_dir
,
1829 closefrom(STDERR_FILENO
+ 1);
1831 if (!options
.use_login
)
1832 do_rc_files(s
, shell
);
1834 /* restore SIGPIPE for child */
1835 signal(SIGPIPE
, SIG_DFL
);
1837 if (s
->is_subsystem
== SUBSYSTEM_INT_SFTP_ERROR
) {
1838 printf("This service allows sftp connections only.\n");
1841 } else if (s
->is_subsystem
== SUBSYSTEM_INT_SFTP
) {
1842 extern int optind
, optreset
;
1846 setproctitle("%s@%s", s
->pw
->pw_name
, INTERNAL_SFTP_NAME
);
1847 args
= xstrdup(command
? command
: "sftp-server");
1848 for (i
= 0, (p
= strtok(args
, " ")); p
; (p
= strtok(NULL
, " ")))
1849 if (i
< ARGV_MAX
- 1)
1852 optind
= optreset
= 1;
1853 __progname
= argv
[0];
1855 ssh_selinux_change_context("sftpd_t");
1857 exit(sftp_server_main(i
, argv
, s
->pw
));
1862 if (options
.use_login
) {
1863 launch_login(pw
, hostname
);
1867 /* Get the last component of the shell name. */
1868 if ((shell0
= strrchr(shell
, '/')) != NULL
)
1874 * If we have no command, execute the shell. In this case, the shell
1875 * name to be passed in argv[0] is preceded by '-' to indicate that
1876 * this is a login shell.
1881 /* Start the shell. Set initial character to '-'. */
1884 if (strlcpy(argv0
+ 1, shell0
, sizeof(argv0
) - 1)
1885 >= sizeof(argv0
) - 1) {
1891 /* Execute the shell. */
1894 execve(shell
, argv
, env
);
1896 /* Executing the shell failed. */
1901 * Execute the command using the user's shell. This uses the -c
1902 * option to execute the command.
1904 argv
[0] = (char *) shell0
;
1906 argv
[2] = (char *) command
;
1908 execve(shell
, argv
, env
);
1914 session_unused(int id
)
1916 debug3("%s: session id %d unused", __func__
, id
);
1917 if (id
>= options
.max_sessions
||
1918 id
>= sessions_nalloc
) {
1919 fatal("%s: insane session id %d (max %d nalloc %d)",
1920 __func__
, id
, options
.max_sessions
, sessions_nalloc
);
1922 memset(&sessions
[id
], 0, sizeof(*sessions
));
1923 sessions
[id
].self
= id
;
1924 sessions
[id
].used
= 0;
1925 sessions
[id
].chanid
= -1;
1926 sessions
[id
].ptyfd
= -1;
1927 sessions
[id
].ttyfd
= -1;
1928 sessions
[id
].ptymaster
= -1;
1929 sessions
[id
].x11_chanids
= NULL
;
1930 sessions
[id
].next_unused
= sessions_first_unused
;
1931 sessions_first_unused
= id
;
1939 if (sessions_first_unused
== -1) {
1940 if (sessions_nalloc
>= options
.max_sessions
)
1942 debug2("%s: allocate (allocated %d max %d)",
1943 __func__
, sessions_nalloc
, options
.max_sessions
);
1944 tmp
= xreallocarray(sessions
, sessions_nalloc
+ 1,
1947 error("%s: cannot allocate %d sessions",
1948 __func__
, sessions_nalloc
+ 1);
1952 session_unused(sessions_nalloc
++);
1955 if (sessions_first_unused
>= sessions_nalloc
||
1956 sessions_first_unused
< 0) {
1957 fatal("%s: insane first_unused %d max %d nalloc %d",
1958 __func__
, sessions_first_unused
, options
.max_sessions
,
1962 s
= &sessions
[sessions_first_unused
];
1964 fatal("%s: session %d already used",
1965 __func__
, sessions_first_unused
);
1967 sessions_first_unused
= s
->next_unused
;
1969 s
->next_unused
= -1;
1970 debug("session_new: session %d", s
->self
);
1979 for (i
= 0; i
< sessions_nalloc
; i
++) {
1980 Session
*s
= &sessions
[i
];
1982 debug("dump: used %d next_unused %d session %d %p "
1983 "channel %d pid %ld",
1994 session_open(Authctxt
*authctxt
, int chanid
)
1996 Session
*s
= session_new();
1997 debug("session_open: channel %d", chanid
);
1999 error("no more sessions");
2002 s
->authctxt
= authctxt
;
2003 s
->pw
= authctxt
->pw
;
2004 if (s
->pw
== NULL
|| !authctxt
->valid
)
2005 fatal("no user for session %d", s
->self
);
2006 debug("session_open: session %d: link with channel %d", s
->self
, chanid
);
2012 session_by_tty(char *tty
)
2015 for (i
= 0; i
< sessions_nalloc
; i
++) {
2016 Session
*s
= &sessions
[i
];
2017 if (s
->used
&& s
->ttyfd
!= -1 && strcmp(s
->tty
, tty
) == 0) {
2018 debug("session_by_tty: session %d tty %s", i
, tty
);
2022 debug("session_by_tty: unknown tty %.100s", tty
);
2028 session_by_channel(int id
)
2031 for (i
= 0; i
< sessions_nalloc
; i
++) {
2032 Session
*s
= &sessions
[i
];
2033 if (s
->used
&& s
->chanid
== id
) {
2034 debug("session_by_channel: session %d channel %d",
2039 debug("session_by_channel: unknown channel %d", id
);
2045 session_by_x11_channel(int id
)
2049 for (i
= 0; i
< sessions_nalloc
; i
++) {
2050 Session
*s
= &sessions
[i
];
2052 if (s
->x11_chanids
== NULL
|| !s
->used
)
2054 for (j
= 0; s
->x11_chanids
[j
] != -1; j
++) {
2055 if (s
->x11_chanids
[j
] == id
) {
2056 debug("session_by_x11_channel: session %d "
2057 "channel %d", s
->self
, id
);
2062 debug("session_by_x11_channel: unknown channel %d", id
);
2068 session_by_pid(pid_t pid
)
2071 debug("session_by_pid: pid %ld", (long)pid
);
2072 for (i
= 0; i
< sessions_nalloc
; i
++) {
2073 Session
*s
= &sessions
[i
];
2074 if (s
->used
&& s
->pid
== pid
)
2077 error("session_by_pid: unknown pid %ld", (long)pid
);
2083 session_window_change_req(Session
*s
)
2085 s
->col
= packet_get_int();
2086 s
->row
= packet_get_int();
2087 s
->xpixel
= packet_get_int();
2088 s
->ypixel
= packet_get_int();
2090 pty_change_window_size(s
->ptyfd
, s
->row
, s
->col
, s
->xpixel
, s
->ypixel
);
2095 session_pty_req(Session
*s
)
2100 if (no_pty_flag
|| !options
.permit_tty
) {
2101 debug("Allocating a pty not permitted for this authentication.");
2104 if (s
->ttyfd
!= -1) {
2105 packet_disconnect("Protocol error: you already have a pty.");
2109 s
->term
= packet_get_string(&len
);
2112 s
->col
= packet_get_int();
2113 s
->row
= packet_get_int();
2115 s
->row
= packet_get_int();
2116 s
->col
= packet_get_int();
2118 s
->xpixel
= packet_get_int();
2119 s
->ypixel
= packet_get_int();
2121 if (strcmp(s
->term
, "") == 0) {
2126 /* Allocate a pty and open it. */
2127 debug("Allocating pty.");
2128 if (!PRIVSEP(pty_allocate(&s
->ptyfd
, &s
->ttyfd
, s
->tty
,
2134 error("session_pty_req: session %d alloc failed", s
->self
);
2137 debug("session_pty_req: session %d alloc %s", s
->self
, s
->tty
);
2139 /* for SSH1 the tty modes length is not given */
2141 n_bytes
= packet_remaining();
2142 tty_parse_modes(s
->ttyfd
, &n_bytes
);
2145 pty_setowner(s
->pw
, s
->tty
);
2147 /* Set window size from the packet. */
2148 pty_change_window_size(s
->ptyfd
, s
->row
, s
->col
, s
->xpixel
, s
->ypixel
);
2151 session_proctitle(s
);
2156 session_subsystem_req(Session
*s
)
2164 s
->subsys
= packet_get_string(&len
);
2166 debug2("subsystem request for %.100s by user %s", s
->subsys
,
2169 for (i
= 0; i
< options
.num_subsystems
; i
++) {
2170 if (strcmp(s
->subsys
, options
.subsystem_name
[i
]) == 0) {
2171 prog
= options
.subsystem_command
[i
];
2172 cmd
= options
.subsystem_args
[i
];
2173 if (strcmp(INTERNAL_SFTP_NAME
, prog
) == 0) {
2174 s
->is_subsystem
= SUBSYSTEM_INT_SFTP
;
2175 debug("subsystem: %s", prog
);
2177 if (stat(prog
, &st
) < 0)
2178 debug("subsystem: cannot stat %s: %s",
2179 prog
, strerror(errno
));
2180 s
->is_subsystem
= SUBSYSTEM_EXT
;
2181 debug("subsystem: exec() %s", cmd
);
2183 success
= do_exec(s
, cmd
) == 0;
2189 logit("subsystem request for %.100s by user %s failed, "
2190 "subsystem not found", s
->subsys
, s
->pw
->pw_name
);
2196 session_x11_req(Session
*s
)
2200 if (s
->auth_proto
!= NULL
|| s
->auth_data
!= NULL
) {
2201 error("session_x11_req: session %d: "
2202 "x11 forwarding already active", s
->self
);
2205 s
->single_connection
= packet_get_char();
2206 s
->auth_proto
= packet_get_string(NULL
);
2207 s
->auth_data
= packet_get_string(NULL
);
2208 s
->screen
= packet_get_int();
2211 if (xauth_valid_string(s
->auth_proto
) &&
2212 xauth_valid_string(s
->auth_data
))
2213 success
= session_setup_x11fwd(s
);
2216 error("Invalid X11 forwarding data");
2219 free(s
->auth_proto
);
2221 s
->auth_proto
= NULL
;
2222 s
->auth_data
= NULL
;
2228 session_shell_req(Session
*s
)
2231 return do_exec(s
, NULL
) == 0;
2235 session_exec_req(Session
*s
)
2239 char *command
= packet_get_string(&len
);
2241 success
= do_exec(s
, command
) == 0;
2247 session_break_req(Session
*s
)
2250 packet_get_int(); /* ignored */
2253 if (s
->ptymaster
== -1 || tcsendbreak(s
->ptymaster
, 0) < 0)
2259 session_env_req(Session
*s
)
2262 u_int name_len
, val_len
, i
;
2264 name
= packet_get_cstring(&name_len
);
2265 val
= packet_get_cstring(&val_len
);
2268 /* Don't set too many environment variables */
2269 if (s
->num_env
> 128) {
2270 debug2("Ignoring env request %s: too many env vars", name
);
2274 for (i
= 0; i
< options
.num_accept_env
; i
++) {
2275 if (match_pattern(name
, options
.accept_env
[i
])) {
2276 debug2("Setting env %d: %s=%s", s
->num_env
, name
, val
);
2277 s
->env
= xreallocarray(s
->env
, s
->num_env
+ 1,
2279 s
->env
[s
->num_env
].name
= name
;
2280 s
->env
[s
->num_env
].val
= val
;
2285 debug2("Ignoring env request %s: disallowed name", name
);
2294 session_auth_agent_req(Session
*s
)
2296 static int called
= 0;
2298 if (no_agent_forwarding_flag
|| !options
.allow_agent_forwarding
) {
2299 debug("session_auth_agent_req: no_agent_forwarding_flag");
2306 return auth_input_request_forwarding(s
->pw
);
2311 session_input_channel_req(Channel
*c
, const char *rtype
)
2316 if ((s
= session_by_channel(c
->self
)) == NULL
) {
2317 logit("session_input_channel_req: no session %d req %.100s",
2321 debug("session_input_channel_req: session %d req %s", s
->self
, rtype
);
2324 * a session is in LARVAL state until a shell, a command
2325 * or a subsystem is executed
2327 if (c
->type
== SSH_CHANNEL_LARVAL
) {
2328 if (strcmp(rtype
, "shell") == 0) {
2329 success
= session_shell_req(s
);
2330 } else if (strcmp(rtype
, "exec") == 0) {
2331 success
= session_exec_req(s
);
2332 } else if (strcmp(rtype
, "pty-req") == 0) {
2333 success
= session_pty_req(s
);
2334 } else if (strcmp(rtype
, "x11-req") == 0) {
2335 success
= session_x11_req(s
);
2336 } else if (strcmp(rtype
, "auth-agent-req@openssh.com") == 0) {
2337 success
= session_auth_agent_req(s
);
2338 } else if (strcmp(rtype
, "subsystem") == 0) {
2339 success
= session_subsystem_req(s
);
2340 } else if (strcmp(rtype
, "env") == 0) {
2341 success
= session_env_req(s
);
2344 if (strcmp(rtype
, "window-change") == 0) {
2345 success
= session_window_change_req(s
);
2346 } else if (strcmp(rtype
, "break") == 0) {
2347 success
= session_break_req(s
);
2354 session_set_fds(Session
*s
, int fdin
, int fdout
, int fderr
, int ignore_fderr
,
2358 fatal("session_set_fds: called for proto != 2.0");
2360 * now that have a child and a pipe to the child,
2361 * we can activate our channel and register the fd's
2363 if (s
->chanid
== -1)
2364 fatal("no channel for session %d", s
->self
);
2365 channel_set_fds(s
->chanid
,
2367 ignore_fderr
? CHAN_EXTENDED_IGNORE
: CHAN_EXTENDED_READ
,
2368 1, is_tty
, CHAN_SES_WINDOW_DEFAULT
);
2372 * Function to perform pty cleanup. Also called if we get aborted abnormally
2373 * (e.g., due to a dropped connection).
2376 session_pty_cleanup2(Session
*s
)
2379 error("session_pty_cleanup: no session");
2385 debug("session_pty_cleanup: session %d release %s", s
->self
, s
->tty
);
2387 /* Record that the user has logged out. */
2389 record_logout(s
->pid
, s
->tty
, s
->pw
->pw_name
);
2391 /* Release the pseudo-tty. */
2393 pty_release(s
->tty
);
2396 * Close the server side of the socket pairs. We must do this after
2397 * the pty cleanup, so that another process doesn't get this pty
2398 * while we're still cleaning up.
2400 if (s
->ptymaster
!= -1 && close(s
->ptymaster
) < 0)
2401 error("close(s->ptymaster/%d): %s",
2402 s
->ptymaster
, strerror(errno
));
2404 /* unlink pty from session */
2409 session_pty_cleanup(Session
*s
)
2411 PRIVSEP(session_pty_cleanup2(s
));
2417 #define SSH_SIG(x) if (sig == SIG ## x) return #x
2432 return "SIG@openssh.com";
2436 session_close_x11(int id
)
2440 if ((c
= channel_by_id(id
)) == NULL
) {
2441 debug("session_close_x11: x11 channel %d missing", id
);
2443 /* Detach X11 listener */
2444 debug("session_close_x11: detach x11 channel %d", id
);
2445 channel_cancel_cleanup(id
);
2446 if (c
->ostate
!= CHAN_OUTPUT_CLOSED
)
2452 session_close_single_x11(int id
, void *arg
)
2457 debug3("session_close_single_x11: channel %d", id
);
2458 channel_cancel_cleanup(id
);
2459 if ((s
= session_by_x11_channel(id
)) == NULL
)
2460 fatal("session_close_single_x11: no x11 channel %d", id
);
2461 for (i
= 0; s
->x11_chanids
[i
] != -1; i
++) {
2462 debug("session_close_single_x11: session %d: "
2463 "closing channel %d", s
->self
, s
->x11_chanids
[i
]);
2465 * The channel "id" is already closing, but make sure we
2466 * close all of its siblings.
2468 if (s
->x11_chanids
[i
] != id
)
2469 session_close_x11(s
->x11_chanids
[i
]);
2471 free(s
->x11_chanids
);
2472 s
->x11_chanids
= NULL
;
2475 free(s
->auth_proto
);
2476 s
->auth_proto
= NULL
;
2478 s
->auth_data
= NULL
;
2479 free(s
->auth_display
);
2480 s
->auth_display
= NULL
;
2484 session_exit_message(Session
*s
, int status
)
2488 if ((c
= channel_lookup(s
->chanid
)) == NULL
)
2489 fatal("session_exit_message: session %d: no channel %d",
2490 s
->self
, s
->chanid
);
2491 debug("session_exit_message: session %d channel %d pid %ld",
2492 s
->self
, s
->chanid
, (long)s
->pid
);
2494 if (WIFEXITED(status
)) {
2495 channel_request_start(s
->chanid
, "exit-status", 0);
2496 packet_put_int(WEXITSTATUS(status
));
2498 } else if (WIFSIGNALED(status
)) {
2499 channel_request_start(s
->chanid
, "exit-signal", 0);
2500 packet_put_cstring(sig2name(WTERMSIG(status
)));
2502 packet_put_char(WCOREDUMP(status
)? 1 : 0);
2503 #else /* WCOREDUMP */
2505 #endif /* WCOREDUMP */
2506 packet_put_cstring("");
2507 packet_put_cstring("");
2510 /* Some weird exit cause. Just exit. */
2511 packet_disconnect("wait returned status %04x.", status
);
2514 /* disconnect channel */
2515 debug("session_exit_message: release channel %d", s
->chanid
);
2518 * Adjust cleanup callback attachment to send close messages when
2519 * the channel gets EOF. The session will be then be closed
2520 * by session_close_by_channel when the childs close their fds.
2522 channel_register_cleanup(c
->self
, session_close_by_channel
, 1);
2525 * emulate a write failure with 'chan_write_failed', nobody will be
2526 * interested in data we write.
2527 * Note that we must not call 'chan_read_failed', since there could
2528 * be some more data waiting in the pipe.
2530 if (c
->ostate
!= CHAN_OUTPUT_CLOSED
)
2531 chan_write_failed(c
);
2535 session_close(Session
*s
)
2537 struct ssh
*ssh
= active_state
; /* XXX */
2540 verbose("Close session: user %s from %.200s port %d id %d",
2542 ssh_remote_ipaddr(ssh
),
2543 ssh_remote_port(ssh
),
2547 session_pty_cleanup(s
);
2550 free(s
->x11_chanids
);
2551 free(s
->auth_display
);
2553 free(s
->auth_proto
);
2555 if (s
->env
!= NULL
) {
2556 for (i
= 0; i
< s
->num_env
; i
++) {
2557 free(s
->env
[i
].name
);
2558 free(s
->env
[i
].val
);
2562 session_proctitle(s
);
2563 session_unused(s
->self
);
2567 session_close_by_pid(pid_t pid
, int status
)
2569 Session
*s
= session_by_pid(pid
);
2571 debug("session_close_by_pid: no session for pid %ld",
2575 if (s
->chanid
!= -1)
2576 session_exit_message(s
, status
);
2578 session_pty_cleanup(s
);
2583 * this is called when a channel dies before
2584 * the session 'child' itself dies
2587 session_close_by_channel(int id
, void *arg
)
2589 Session
*s
= session_by_channel(id
);
2593 debug("session_close_by_channel: no session for id %d", id
);
2596 debug("session_close_by_channel: channel %d child %ld",
2599 debug("session_close_by_channel: channel %d: has child", id
);
2601 * delay detach of session, but release pty, since
2602 * the fd's to the child are already closed
2605 session_pty_cleanup(s
);
2608 /* detach by removing callback */
2609 channel_cancel_cleanup(s
->chanid
);
2611 /* Close any X11 listeners associated with this session */
2612 if (s
->x11_chanids
!= NULL
) {
2613 for (i
= 0; s
->x11_chanids
[i
] != -1; i
++) {
2614 session_close_x11(s
->x11_chanids
[i
]);
2615 s
->x11_chanids
[i
] = -1;
2624 session_destroy_all(void (*closefunc
)(Session
*))
2627 for (i
= 0; i
< sessions_nalloc
; i
++) {
2628 Session
*s
= &sessions
[i
];
2630 if (closefunc
!= NULL
)
2639 session_tty_list(void)
2641 static char buf
[1024];
2646 for (i
= 0; i
< sessions_nalloc
; i
++) {
2647 Session
*s
= &sessions
[i
];
2648 if (s
->used
&& s
->ttyfd
!= -1) {
2650 if (strncmp(s
->tty
, "/dev/", 5) != 0) {
2651 cp
= strrchr(s
->tty
, '/');
2652 cp
= (cp
== NULL
) ? s
->tty
: cp
+ 1;
2657 strlcat(buf
, ",", sizeof buf
);
2658 strlcat(buf
, cp
, sizeof buf
);
2662 strlcpy(buf
, "notty", sizeof buf
);
2667 session_proctitle(Session
*s
)
2670 error("no user for session %d", s
->self
);
2672 setproctitle("%s@%s", s
->pw
->pw_name
, session_tty_list());
2676 session_setup_x11fwd(Session
*s
)
2679 char display
[512], auth_display
[512];
2680 char hostname
[NI_MAXHOST
];
2683 if (no_x11_forwarding_flag
) {
2684 packet_send_debug("X11 forwarding disabled in user configuration file.");
2687 if (!options
.x11_forwarding
) {
2688 debug("X11 forwarding disabled in server configuration file.");
2691 if (options
.xauth_location
== NULL
||
2692 (stat(options
.xauth_location
, &st
) == -1)) {
2693 packet_send_debug("No xauth program; cannot forward with spoofing.");
2696 if (options
.use_login
) {
2697 packet_send_debug("X11 forwarding disabled; "
2698 "not compatible with UseLogin=yes.");
2701 if (s
->display
!= NULL
) {
2702 debug("X11 display already set.");
2705 if (x11_create_display_inet(options
.x11_display_offset
,
2706 options
.x11_use_localhost
, s
->single_connection
,
2707 &s
->display_number
, &s
->x11_chanids
) == -1) {
2708 debug("x11_create_display_inet failed.");
2711 for (i
= 0; s
->x11_chanids
[i
] != -1; i
++) {
2712 channel_register_cleanup(s
->x11_chanids
[i
],
2713 session_close_single_x11
, 0);
2716 /* Set up a suitable value for the DISPLAY variable. */
2717 if (gethostname(hostname
, sizeof(hostname
)) < 0)
2718 fatal("gethostname: %.100s", strerror(errno
));
2720 * auth_display must be used as the displayname when the
2721 * authorization entry is added with xauth(1). This will be
2722 * different than the DISPLAY string for localhost displays.
2724 if (options
.x11_use_localhost
) {
2725 snprintf(display
, sizeof display
, "localhost:%u.%u",
2726 s
->display_number
, s
->screen
);
2727 snprintf(auth_display
, sizeof auth_display
, "unix:%u.%u",
2728 s
->display_number
, s
->screen
);
2729 s
->display
= xstrdup(display
);
2730 s
->auth_display
= xstrdup(auth_display
);
2732 #ifdef IPADDR_IN_DISPLAY
2734 struct in_addr my_addr
;
2736 he
= gethostbyname(hostname
);
2738 error("Can't get IP address for X11 DISPLAY.");
2739 packet_send_debug("Can't get IP address for X11 DISPLAY.");
2742 memcpy(&my_addr
, he
->h_addr_list
[0], sizeof(struct in_addr
));
2743 snprintf(display
, sizeof display
, "%.50s:%u.%u", inet_ntoa(my_addr
),
2744 s
->display_number
, s
->screen
);
2746 snprintf(display
, sizeof display
, "%.400s:%u.%u", hostname
,
2747 s
->display_number
, s
->screen
);
2749 s
->display
= xstrdup(display
);
2750 s
->auth_display
= xstrdup(display
);
2757 do_authenticated2(Authctxt
*authctxt
)
2759 server_loop2(authctxt
);
2763 do_cleanup(Authctxt
*authctxt
)
2765 static int called
= 0;
2767 debug("do_cleanup");
2769 /* no cleanup if we're in the child for login shell */
2773 /* avoid double cleanup */
2778 if (authctxt
== NULL
)
2782 if (options
.use_pam
) {
2784 sshpam_thread_cleanup();
2788 if (!authctxt
->authenticated
)
2792 if (options
.kerberos_ticket_cleanup
&&
2794 krb5_cleanup_proc(authctxt
);
2798 if (compat20
&& options
.gss_cleanup_creds
)
2799 ssh_gssapi_cleanup_creds();
2802 /* remove agent socket */
2803 auth_sock_cleanup_proc(authctxt
->pw
);
2806 * Cleanup ptys/utmp only if privsep is disabled,
2807 * or if running in monitor.
2809 if (!use_privsep
|| mm_is_monitor())
2810 session_destroy_all(session_pty_cleanup2
);
2813 /* Return a name for the remote host that fits inside utmp_size */
2816 session_get_remote_name_or_ip(struct ssh
*ssh
, u_int utmp_size
, int use_dns
)
2818 const char *remote
= "";
2821 remote
= auth_get_canonical_hostname(ssh
, use_dns
);
2822 if (utmp_size
== 0 || strlen(remote
) > utmp_size
)
2823 remote
= ssh_remote_ipaddr(ssh
);