2 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * As far as I am concerned, the code I have written for this software
6 * can be used freely for any purpose. Any derived versions of this
7 * software must be clearly marked as such, and if the derived work is
8 * incompatible with the protocol description in the RFC file, it must be
9 * called by a name other than "ssh" or "Secure Shell".
11 * SSH2 support by Markus Friedl.
12 * Copyright (c) 2000 Markus Friedl. All rights reserved.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 RCSID("$OpenBSD: session.c,v 1.37 2000/09/07 20:27:53 deraadt Exp $");
54 #include "auth-options.h"
56 #ifdef WITH_IRIX_PROJECT
58 #endif /* WITH_IRIX_PROJECT */
60 #if defined(HAVE_USERSEC_H)
71 #include <sys/cygwin.h>
72 #define is_winnt (GetVersion() < 0x80000000)
76 #if defined(HAVE_GETUSERATTR) && !defined(S_UFSIZE_HARD) && defined(S_UFSIZE)
77 # define S_UFSIZE_HARD S_UFSIZE "_hard"
78 # define S_UCPU_HARD S_UCPU "_hard"
79 # define S_UDATA_HARD S_UDATA "_hard"
80 # define S_USTACK_HARD S_USTACK "_hard"
81 # define S_URSS_HARD S_URSS "_hard"
82 # define S_UCORE_HARD S_UCORE "_hard"
83 # define S_UNOFILE_HARD S_UNOFILE "_hard"
87 #include <login_cap.h>
93 typedef struct Session Session;
102 int ptyfd, ttyfd, ptymaster;
103 int row, col, xpixel, ypixel;
110 int single_connection;
117 Session *session_new(void);
118 void session_set_fds(Session *s, int fdin, int fdout, int fderr);
119 void session_pty_cleanup(Session *s);
120 void session_proctitle(Session *s);
121 void do_exec_pty(Session *s, const char *command, struct passwd * pw);
122 void do_exec_no_pty(Session *s, const char *command, struct passwd * pw);
123 void do_login(Session *s);
126 do_child(const char *command, struct passwd * pw, const char *term,
127 const char *display, const char *auth_proto,
128 const char *auth_data, const char *ttyname);
131 extern ServerOptions options;
132 #ifdef HAVE___PROGNAME
133 extern char *__progname;
134 #else /* HAVE___PROGNAME */
135 static const char *__progname = "sshd";
136 #endif /* HAVE___PROGNAME */
138 extern int log_stderr;
139 extern int debug_flag;
140 extern unsigned int utmp_len;
142 extern int startup_pipe;
144 /* Local Xauthority file. */
145 static char *xauthfile;
147 /* original command from peer. */
148 char *original_command = NULL;
151 #define MAX_SESSIONS 10
152 Session sessions[MAX_SESSIONS];
153 #ifdef WITH_AIXAUTHENTICATE
154 /* AIX's lastlogin message, set in auth1.c */
156 #endif /* WITH_AIXAUTHENTICATE */
158 #ifdef HAVE_LOGIN_CAP
159 static login_cap_t *lc;
163 * Remove local Xauthority file.
166 xauthfile_cleanup_proc(void *ignore)
168 debug("xauthfile_cleanup_proc called");
170 if (xauthfile != NULL) {
173 p = strrchr(xauthfile, '/');
184 * Function to perform cleanup if we get aborted abnormally (e.g., due to a
185 * dropped connection).
188 pty_cleanup_proc(void *session)
192 fatal("pty_cleanup_proc: no session");
193 debug("pty_cleanup_proc: %s", s->tty);
196 /* Record that the user has logged out. */
197 record_logout(s->pid, s->tty);
200 /* Release the pseudo-tty. */
205 * Prepares for an interactive session. This is called after the user has
206 * been successfully authenticated. During this message exchange, pseudo
207 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
208 * are requested, etc.
211 do_authenticated(struct passwd * pw)
215 int compression_level = 0, enable_compression_after_reply = 0;
220 unsigned int proto_len, data_len, dlen;
223 * Cancel the alarm we set to limit the time taken for
227 if (startup_pipe != -1) {
233 * Inform the channel mechanism that we are the server side and that
234 * the client may request to connect to any port at all. (The user
235 * could do it anyway, and we wouldn\'t know what is permitted except
236 * by the client telling us, so we can equally well trust the client
237 * not to request anything bogus.)
239 if (!no_port_forwarding_flag)
240 channel_permit_all_opens();
245 #ifdef HAVE_LOGIN_CAP
246 if ((lc = login_getclass(pw->pw_class)) == NULL) {
247 error("unable to get login class");
253 * We stay in this loop until the client requests to execute a shell
259 /* Get a packet from the client. */
260 type = packet_read(&plen);
262 /* Process the packet. */
264 case SSH_CMSG_REQUEST_COMPRESSION:
265 packet_integrity_check(plen, 4, type);
266 compression_level = packet_get_int();
267 if (compression_level < 1 || compression_level > 9) {
268 packet_send_debug("Received illegal compression level %d.",
272 /* Enable compression after we have responded with SUCCESS. */
273 enable_compression_after_reply = 1;
277 case SSH_CMSG_REQUEST_PTY:
279 debug("Allocating a pty not permitted for this authentication.");
283 packet_disconnect("Protocol error: you already have a pty.");
285 debug("Allocating pty.");
287 /* Allocate a pty and open it. */
288 if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty,
290 error("Failed to allocate pty.");
293 fatal_add_cleanup(pty_cleanup_proc, (void *)s);
294 pty_setowner(pw, s->tty);
296 /* Get TERM from the packet. Note that the value may be of arbitrary length. */
297 s->term = packet_get_string(&dlen);
298 packet_integrity_check(dlen, strlen(s->term), type);
299 /* packet_integrity_check(plen, 4 + dlen + 4*4 + n_bytes, type); */
300 /* Remaining bytes */
301 n_bytes = plen - (4 + dlen + 4 * 4);
303 if (strcmp(s->term, "") == 0) {
307 /* Get window size from the packet. */
308 s->row = packet_get_int();
309 s->col = packet_get_int();
310 s->xpixel = packet_get_int();
311 s->ypixel = packet_get_int();
312 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
314 /* Get tty modes from the packet. */
315 tty_parse_modes(s->ttyfd, &n_bytes);
316 packet_integrity_check(plen, 4 + dlen + 4 * 4 + n_bytes, type);
318 session_proctitle(s);
320 /* Indicate that we now have a pty. */
325 case SSH_CMSG_X11_REQUEST_FORWARDING:
326 if (!options.x11_forwarding) {
327 packet_send_debug("X11 forwarding disabled in server configuration file.");
330 if (!options.xauth_location) {
331 packet_send_debug("No xauth program; cannot forward with spoofing.");
334 if (no_x11_forwarding_flag) {
335 packet_send_debug("X11 forwarding not permitted for this authentication.");
338 debug("Received request for X11 forwarding with auth spoofing.");
339 if (s->display != NULL)
340 packet_disconnect("Protocol error: X11 display already set.");
342 s->auth_proto = packet_get_string(&proto_len);
343 s->auth_data = packet_get_string(&data_len);
344 packet_integrity_check(plen, 4 + proto_len + 4 + data_len + 4, type);
346 if (packet_get_protocol_flags() & SSH_PROTOFLAG_SCREEN_NUMBER)
347 s->screen = packet_get_int();
350 s->display = x11_create_display_inet(s->screen, options.x11_display_offset);
352 if (s->display == NULL)
355 /* Setup to always have a local .Xauthority. */
356 xauthfile = xmalloc(MAXPATHLEN);
357 strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
358 temporarily_use_uid(pw->pw_uid);
359 if (mkdtemp(xauthfile) == NULL) {
361 error("private X11 dir: mkdtemp %s failed: %s",
362 xauthfile, strerror(errno));
365 /* XXXX remove listening channels */
368 strlcat(xauthfile, "/cookies", MAXPATHLEN);
369 fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
373 fatal_add_cleanup(xauthfile_cleanup_proc, NULL);
377 case SSH_CMSG_AGENT_REQUEST_FORWARDING:
378 if (no_agent_forwarding_flag || compat13) {
379 debug("Authentication agent forwarding not permitted for this authentication.");
382 debug("Received authentication agent forwarding request.");
383 success = auth_input_request_forwarding(pw);
386 case SSH_CMSG_PORT_FORWARD_REQUEST:
387 if (no_port_forwarding_flag) {
388 debug("Port forwarding not permitted for this authentication.");
391 debug("Received TCP/IP port forwarding request.");
392 channel_input_port_forward_request(pw->pw_uid == 0, options.gateway_ports);
396 case SSH_CMSG_MAX_PACKET_SIZE:
397 if (packet_set_maxsize(packet_get_int()) > 0)
401 case SSH_CMSG_EXEC_SHELL:
402 case SSH_CMSG_EXEC_CMD:
403 /* Set interactive/non-interactive mode. */
404 packet_set_interactive(have_pty || s->display != NULL,
407 if (type == SSH_CMSG_EXEC_CMD) {
408 command = packet_get_string(&dlen);
409 debug("Exec command '%.500s'", command);
410 packet_integrity_check(plen, 4 + dlen, type);
413 packet_integrity_check(plen, 0, type);
415 if (forced_command != NULL) {
416 original_command = command;
417 command = forced_command;
418 debug("Forced command '%.500s'", forced_command);
421 do_exec_pty(s, command, pw);
423 do_exec_no_pty(s, command, pw);
427 /* Cleanup user's local Xauthority file. */
429 xauthfile_cleanup_proc(NULL);
434 * Any unknown messages in this phase are ignored,
435 * and a failure message is returned.
437 log("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);
452 * This is called to fork and execute a command when we have no tty. This
453 * will call do_child from the child, and server_loop from the parent after
454 * setting up file descriptors and such.
457 do_exec_no_pty(Session *s, const char *command, struct passwd * pw)
462 int pin[2], pout[2], perr[2];
463 /* Allocate pipes for communicating with the program. */
464 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
465 packet_disconnect("Could not create pipes: %.100s",
467 #else /* USE_PIPES */
468 int inout[2], err[2];
469 /* Uses socket pairs to communicate with the program. */
470 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
471 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
472 packet_disconnect("Could not create socket pairs: %.100s",
474 #endif /* USE_PIPES */
476 fatal("do_exec_no_pty: no session");
478 session_proctitle(s);
484 /* Fork the child. */
485 if ((pid = fork()) == 0) {
486 /* Child. Reinitialize the log since the pid has changed. */
487 log_init(__progname, options.log_level, options.log_facility, log_stderr);
490 * Create a new session and process group since the 4.4BSD
491 * setlogin() affects the entire process group.
494 error("setsid failed: %.100s", strerror(errno));
498 * Redirect stdin. We close the parent side of the socket
499 * pair, and make the child side the standard input.
502 if (dup2(pin[0], 0) < 0)
503 perror("dup2 stdin");
506 /* Redirect stdout. */
508 if (dup2(pout[1], 1) < 0)
509 perror("dup2 stdout");
512 /* Redirect stderr. */
514 if (dup2(perr[1], 2) < 0)
515 perror("dup2 stderr");
517 #else /* USE_PIPES */
519 * Redirect stdin, stdout, and stderr. Stdin and stdout will
520 * use the same socket, as some programs (particularly rdist)
521 * seem to depend on it.
525 if (dup2(inout[0], 0) < 0) /* stdin */
526 perror("dup2 stdin");
527 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
528 perror("dup2 stdout");
529 if (dup2(err[0], 2) < 0) /* stderr */
530 perror("dup2 stderr");
531 #endif /* USE_PIPES */
533 /* Do processing for the child (exec command etc). */
534 do_child(command, pw, NULL, s->display, s->auth_proto, s->auth_data, NULL);
539 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
542 packet_disconnect("fork failed: %.100s", strerror(errno));
545 /* We are the parent. Close the child sides of the pipes. */
551 session_set_fds(s, pin[1], pout[0], s->extended ? perr[0] : -1);
553 /* Enter the interactive session. */
554 server_loop(pid, pin[1], pout[0], perr[0]);
555 /* server_loop has closed pin[1], pout[1], and perr[1]. */
557 #else /* USE_PIPES */
558 /* We are the parent. Close the child sides of the socket pairs. */
563 * Enter the interactive session. Note: server_loop must be able to
564 * handle the case that fdin and fdout are the same.
567 session_set_fds(s, inout[1], inout[1], s->extended ? err[1] : -1);
569 server_loop(pid, inout[1], inout[1], err[1]);
570 /* server_loop has closed inout[1] and err[1]. */
572 #endif /* USE_PIPES */
576 * This is called to fork and execute a command when we have a tty. This
577 * will call do_child from the child, and server_loop from the parent after
578 * setting up file descriptors, controlling tty, updating wtmp, utmp,
579 * lastlog, and other such operations.
582 do_exec_pty(Session *s, const char *command, struct passwd * pw)
584 int fdout, ptyfd, ttyfd, ptymaster;
588 fatal("do_exec_pty: no session");
593 do_pam_session(pw->pw_name, s->tty);
597 /* Fork the child. */
598 if ((pid = fork()) == 0) {
599 /* Child. Reinitialize the log because the pid has changed. */
600 log_init(__progname, options.log_level, options.log_facility, log_stderr);
602 /* Close the master side of the pseudo tty. */
605 /* Make the pseudo tty our controlling tty. */
606 pty_make_controlling_tty(&ttyfd, s->tty);
608 /* Redirect stdin from the pseudo tty. */
609 if (dup2(ttyfd, fileno(stdin)) < 0)
610 error("dup2 stdin failed: %.100s", strerror(errno));
612 /* Redirect stdout to the pseudo tty. */
613 if (dup2(ttyfd, fileno(stdout)) < 0)
614 error("dup2 stdin failed: %.100s", strerror(errno));
616 /* Redirect stderr to the pseudo tty. */
617 if (dup2(ttyfd, fileno(stderr)) < 0)
618 error("dup2 stdin failed: %.100s", strerror(errno));
620 /* Close the extra descriptor for the pseudo tty. */
623 /* record login, etc. similar to login(1) */
624 if (command == NULL && !options.use_login)
627 /* Do common processing for the child, such as execing the command. */
628 do_child(command, pw, s->term, s->display, s->auth_proto,
629 s->auth_data, s->tty);
634 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
637 packet_disconnect("fork failed: %.100s", strerror(errno));
640 /* Parent. Close the slave side of the pseudo tty. */
644 * Create another descriptor of the pty master side for use as the
645 * standard input. We could use the original descriptor, but this
646 * simplifies code in server_loop. The descriptor is bidirectional.
650 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
652 /* we keep a reference to the pty master */
653 ptymaster = dup(ptyfd);
655 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
656 s->ptymaster = ptymaster;
658 /* Enter interactive session. */
660 session_set_fds(s, ptyfd, fdout, -1);
662 server_loop(pid, ptyfd, fdout, -1);
663 /* server_loop _has_ closed ptyfd and fdout. */
664 session_pty_cleanup(s);
669 get_remote_name_or_ip(void)
671 static const char *remote = "";
673 remote = get_canonical_hostname();
674 if (utmp_len == 0 || strlen(remote) > utmp_len)
675 remote = get_remote_ipaddr();
679 /* administrative, login(1)-like work */
686 char hostname[MAXHOSTNAMELEN];
688 struct sockaddr_storage from;
690 time_t last_login_time;
691 struct passwd * pw = s->pw;
692 pid_t pid = getpid();
695 * Get IP address of client. If the connection is not a socket, let
696 * the address be 0.0.0.0.
698 memset(&from, 0, sizeof(from));
699 if (packet_connection_is_on_socket()) {
700 fromlen = sizeof(from);
701 if (getpeername(packet_get_connection_in(),
702 (struct sockaddr *) & from, &fromlen) < 0) {
703 debug("getpeername: %.100s", strerror(errno));
708 /* Get the time and hostname when the user last logged in. */
709 last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name,
710 hostname, sizeof(hostname));
712 /* Get the time and hostname when the user last logged in. */
714 last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name,
715 hostname, sizeof(hostname));
717 /* Record that there was a login on that tty from the remote host. */
718 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
719 get_remote_name_or_ip(), (struct sockaddr *)&from);
721 /* Done if .hushlogin exists. */
722 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
723 #ifdef HAVE_LOGIN_CAP
724 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
726 if (stat(buf, &st) >= 0)
731 print_pam_messages();
733 #ifdef WITH_AIXAUTHENTICATE
734 if (aixloginmsg && *aixloginmsg)
735 printf("%s\n", aixloginmsg);
736 #endif /* WITH_AIXAUTHENTICATE */
738 if (last_login_time != 0) {
739 time_string = ctime(&last_login_time);
740 if (strchr(time_string, '\n'))
741 *strchr(time_string, '\n') = 0;
742 if (strcmp(buf, "") == 0)
743 printf("Last login: %s\r\n", time_string);
745 printf("Last login: %s from %s\r\n", time_string, hostname);
747 if (options.print_motd) {
748 #ifdef HAVE_LOGIN_CAP
749 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
752 f = fopen("/etc/motd", "r");
755 while (fgets(buf, sizeof(buf), f))
763 * Sets the value of the given variable in the environment. If the variable
764 * already exists, its value is overriden.
767 child_set_env(char ***envp, unsigned int *envsizep, const char *name,
770 unsigned int i, namelen;
774 * Find the slot where the value should be stored. If the variable
775 * already exists, we reuse the slot; otherwise we append a new slot
776 * at the end of the array, expanding if necessary.
779 namelen = strlen(name);
780 for (i = 0; env[i]; i++)
781 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
784 /* Reuse the slot. */
787 /* New variable. Expand if necessary. */
788 if (i >= (*envsizep) - 1) {
790 env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *));
792 /* Need to set the NULL pointer at end of array beyond the new slot. */
796 /* Allocate space and format the variable in the appropriate slot. */
797 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
798 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
802 * Reads environment variables from the given file and adds/overrides them
803 * into the environment. If the file does not exist, this does nothing.
804 * Otherwise, it must consist of empty lines, comments (line starts with '#')
805 * and assignments of the form name=value. No other forms are allowed.
808 read_environment_file(char ***env, unsigned int *envsize,
809 const char *filename)
815 f = fopen(filename, "r");
819 while (fgets(buf, sizeof(buf), f)) {
820 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
822 if (!*cp || *cp == '#' || *cp == '\n')
824 if (strchr(cp, '\n'))
825 *strchr(cp, '\n') = '\0';
826 value = strchr(cp, '=');
828 fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf);
832 * Replace the equals sign by nul, and advance value to
837 child_set_env(env, envsize, cp, value);
844 * Sets any environment variables which have been specified by PAM
846 void do_pam_environment(char ***env, int *envsize)
848 char *equals, var_name[512], var_val[512];
852 if ((pam_env = fetch_pam_environment()) == NULL)
855 for(i = 0; pam_env[i] != NULL; i++) {
856 if ((equals = strstr(pam_env[i], "=")) == NULL)
859 if (strlen(pam_env[i]) < (sizeof(var_name) - 1)) {
860 memset(var_name, '\0', sizeof(var_name));
861 memset(var_val, '\0', sizeof(var_val));
863 strncpy(var_name, pam_env[i], equals - pam_env[i]);
864 strcpy(var_val, equals + 1);
866 debug("PAM environment: %s=%s", var_name, var_val);
868 child_set_env(env, envsize, var_name, var_val);
874 #if defined(HAVE_GETUSERATTR)
876 * AIX-specific login initialisation
878 void set_limit(char *user, char *soft, char *hard, int resource, int mult)
883 getrlimit(resource, &rlim);
886 if (getuserattr(user, soft, &slim, SEC_INT) != -1) {
888 rlim.rlim_cur = RLIM_INFINITY;
889 } else if (slim != 0) {
890 /* See the wackiness below */
891 if (rlim.rlim_cur == slim * mult)
894 rlim.rlim_cur = slim * mult;
899 if (getuserattr(user, hard, &hlim, SEC_INT) != -1) {
901 rlim.rlim_max = RLIM_INFINITY;
902 } else if (hlim != 0) {
903 rlim.rlim_max = hlim * mult;
908 * XXX For cpu and fsize the soft limit is set to the hard limit
909 * if the hard limit is left at its default value and the soft limit
910 * is changed from its default value, either by requesting it
911 * (slim == 0) or by setting it to the current default. At least
912 * that's how rlogind does it. If you're confused you're not alone.
913 * Bug or feature? AIX 4.3.1.2
915 if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu"))
916 && hlim == 0 && slim != 0)
917 rlim.rlim_max = rlim.rlim_cur;
918 /* A specified hard limit limits the soft limit */
919 else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max)
920 rlim.rlim_cur = rlim.rlim_max;
921 /* A soft limit can increase a hard limit */
922 else if (rlim.rlim_cur > rlim.rlim_max)
923 rlim.rlim_max = rlim.rlim_cur;
925 if (setrlimit(resource, &rlim) != 0)
926 error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno));
929 void set_limits_from_userattr(char *user)
934 set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512);
935 set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1);
936 set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512);
937 set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512);
938 set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512);
939 set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512);
940 #if defined(S_UNOFILE)
941 set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1);
944 if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) {
945 /* Convert decimal to octal */
946 (void) snprintf(buf, sizeof(buf), "%d", mask);
947 if (sscanf(buf, "%o", &mask) == 1)
951 #endif /* defined(HAVE_GETUSERATTR) */
954 * Performs common processing for the child, such as setting up the
955 * environment, closing extra file descriptors, setting the user and group
956 * ids, and executing the command or shell.
959 do_child(const char *command, struct passwd * pw, const char *term,
960 const char *display, const char *auth_proto,
961 const char *auth_data, const char *ttyname)
963 const char *shell, *hostname = NULL, *cp = NULL;
967 unsigned int envsize, i;
969 extern char **environ;
972 #ifdef WITH_IRIX_PROJECT
974 #endif /* WITH_IRIX_PROJECT */
976 /* login(1) is only called if we execute the login shell */
977 if (options.use_login && command != NULL)
978 options.use_login = 0;
980 #ifndef USE_PAM /* pam_nologin handles this */
981 if (!options.use_login) {
982 # ifdef HAVE_LOGIN_CAP
983 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
984 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
985 _PATH_NOLOGIN), "r");
986 # else /* HAVE_LOGIN_CAP */
988 f = fopen(_PATH_NOLOGIN, "r");
989 # endif /* HAVE_LOGIN_CAP */
991 /* /etc/nologin exists. Print its contents and exit. */
992 while (fgets(buf, sizeof(buf), f))
1000 /* Set login name, uid, gid, and groups. */
1001 /* Login(1) does this as well, and it needs uid 0 for the "-h"
1002 switch, so we let login(1) to this for us. */
1003 if (!options.use_login) {
1005 extern char **saved_argv;
1006 extern int saved_argc;
1007 char *host = get_canonical_hostname ();
1009 if (sia_become_user(NULL, saved_argc, saved_argv, host,
1010 pw->pw_name, ttyname, 0, NULL, NULL, SIA_BEU_SETLUID) !=
1012 perror("sia_become_user");
1015 if (setreuid(geteuid(), geteuid()) < 0) {
1019 #else /* HAVE_OSF_SIA */
1023 if (getuid() == 0 || geteuid() == 0) {
1025 # ifdef HAVE_GETUSERATTR
1026 set_limits_from_userattr(pw->pw_name);
1027 # endif /* HAVE_GETUSERATTR */
1028 # ifdef HAVE_LOGIN_CAP
1029 if (setusercontext(lc, pw, pw->pw_uid,
1030 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1031 perror("unable to set user context");
1034 # else /* HAVE_LOGIN_CAP */
1035 if (setlogin(pw->pw_name) < 0)
1036 error("setlogin failed: %s", strerror(errno));
1037 if (setgid(pw->pw_gid) < 0) {
1041 /* Initialize the group list. */
1042 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1043 perror("initgroups");
1047 # ifdef WITH_IRIX_ARRAY
1048 /* initialize array session */
1049 if (newarraysess() != 0)
1050 fatal("Failed to set up new array session: %.100s",
1052 # endif /* WITH_IRIX_ARRAY */
1053 # ifdef WITH_IRIX_PROJECT
1054 /* initialize irix project info */
1055 if ((projid = getdfltprojuser(pw->pw_name)) == -1) {
1056 debug("Failed to get project id, using projid 0");
1059 if (setprid(projid))
1060 fatal("Failed to initialize project %d for %s: %.100s",
1061 (int)projid, pw->pw_name, strerror(errno));
1062 # endif /* WITH_IRIX_PROJECT */
1063 /* Permanently switch to the desired uid. */
1064 permanently_set_uid(pw->pw_uid);
1065 # endif /* HAVE_LOGIN_CAP */
1067 #endif /* HAVE_OSF_SIA */
1072 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1073 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1076 * Get the shell from the password data. An empty shell field is
1077 * legal, and means /bin/sh.
1079 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1080 #ifdef HAVE_LOGIN_CAP
1081 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1085 /* Try to get AFS tokens for the local cell. */
1089 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1090 krb_afslog(cell, 0);
1096 /* Initialize the environment. */
1098 env = xmalloc(envsize * sizeof(char *));
1103 * The Windows environment contains some setting which are
1104 * important for a running system. They must not be dropped.
1108 for (ep = environ; *ep; ++ep) {
1109 char *esp = strchr(*ep, '=');
1111 child_set_env(&env, &envsize, *ep, esp + 1);
1117 if (!options.use_login) {
1118 /* Set basic environment. */
1119 child_set_env(&env, &envsize, "USER", pw->pw_name);
1120 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
1121 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
1122 #ifdef HAVE_LOGIN_CAP
1123 (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH);
1124 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
1128 * There's no standard path on Windows. The path contains
1129 * important components pointing to the system directories,
1130 * needed for loading shared libraries. So the path better
1131 * remains intact here.
1133 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
1137 snprintf(buf, sizeof buf, "%.200s/%.50s",
1138 _PATH_MAILDIR, pw->pw_name);
1139 child_set_env(&env, &envsize, "MAIL", buf);
1141 /* Normal systems set SHELL by default. */
1142 child_set_env(&env, &envsize, "SHELL", shell);
1145 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1147 /* Set custom environment options from RSA authentication. */
1148 while (custom_environment) {
1149 struct envstring *ce = custom_environment;
1152 for (i = 0; s[i] != '=' && s[i]; i++);
1155 child_set_env(&env, &envsize, s, s + i + 1);
1157 custom_environment = ce->next;
1162 snprintf(buf, sizeof buf, "%.50s %d %d",
1163 get_remote_ipaddr(), get_remote_port(), get_local_port());
1164 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1167 child_set_env(&env, &envsize, "SSH_TTY", ttyname);
1169 child_set_env(&env, &envsize, "TERM", term);
1171 child_set_env(&env, &envsize, "DISPLAY", display);
1172 if (original_command)
1173 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
1178 char *authstate,*krb5cc;
1180 if ((authstate = getenv("AUTHSTATE")) != NULL)
1181 child_set_env(&env,&envsize,"AUTHSTATE",authstate);
1183 if ((krb5cc = getenv("KRB5CCNAME")) != NULL)
1184 child_set_env(&env,&envsize,"KRB5CCNAME",krb5cc);
1190 extern char *ticket;
1193 child_set_env(&env, &envsize, "KRBTKFILE", ticket);
1198 /* Pull in any environment variables that may have been set by PAM. */
1199 do_pam_environment(&env, &envsize);
1200 #endif /* USE_PAM */
1202 read_environment_file(&env,&envsize,"/etc/environment");
1205 child_set_env(&env, &envsize, "XAUTHORITY", xauthfile);
1206 if (auth_get_socket_name() != NULL)
1207 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1208 auth_get_socket_name());
1210 /* read $HOME/.ssh/environment. */
1211 if (!options.use_login) {
1212 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
1214 read_environment_file(&env, &envsize, buf);
1217 /* dump the environment */
1218 fprintf(stderr, "Environment:\n");
1219 for (i = 0; env[i]; i++)
1220 fprintf(stderr, " %.200s\n", env[i]);
1222 /* we have to stash the hostname before we close our socket. */
1223 if (options.use_login)
1224 hostname = get_remote_name_or_ip();
1226 * Close the connection descriptors; note that this is the child, and
1227 * the server will still have the socket open, and it is important
1228 * that we do not shutdown it. Note that the descriptors cannot be
1229 * closed before building the environment, as we call
1230 * get_remote_ipaddr there.
1232 if (packet_get_connection_in() == packet_get_connection_out())
1233 close(packet_get_connection_in());
1235 close(packet_get_connection_in());
1236 close(packet_get_connection_out());
1239 * Close all descriptors related to channels. They will still remain
1240 * open in the parent.
1242 /* XXX better use close-on-exec? -markus */
1243 channel_close_all();
1246 * Close any extra file descriptors. Note that there may still be
1247 * descriptors left by system functions. They will be closed later.
1252 * Close any extra open file descriptors so that we don\'t have them
1253 * hanging around in clients. Note that we want to do this after
1254 * initgroups, because at least on Solaris 2.3 it leaves file
1257 for (i = 3; i < 64; i++)
1260 /* Change current directory to the user\'s home directory. */
1261 if (chdir(pw->pw_dir) < 0) {
1262 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1263 pw->pw_dir, strerror(errno));
1264 #ifdef HAVE_LOGIN_CAP
1265 if (login_getcapbool(lc, "requirehome", 0))
1271 * Must take new environment into use so that .ssh/rc, /etc/sshrc and
1272 * xauth are run in the proper environment.
1277 * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first
1280 if (!options.use_login) {
1281 if (stat(SSH_USER_RC, &st) >= 0) {
1283 fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_USER_RC);
1285 f = popen(_PATH_BSHELL " " SSH_USER_RC, "w");
1287 if (auth_proto != NULL && auth_data != NULL)
1288 fprintf(f, "%s %s\n", auth_proto, auth_data);
1291 fprintf(stderr, "Could not run %s\n", SSH_USER_RC);
1292 } else if (stat(SSH_SYSTEM_RC, &st) >= 0) {
1294 fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_SYSTEM_RC);
1296 f = popen(_PATH_BSHELL " " SSH_SYSTEM_RC, "w");
1298 if (auth_proto != NULL && auth_data != NULL)
1299 fprintf(f, "%s %s\n", auth_proto, auth_data);
1302 fprintf(stderr, "Could not run %s\n", SSH_SYSTEM_RC);
1303 } else if (options.xauth_location != NULL) {
1304 /* Add authority data to .Xauthority if appropriate. */
1305 if (auth_proto != NULL && auth_data != NULL) {
1306 char *screen = strchr(display, ':');
1309 "Running %.100s add %.100s %.100s %.100s\n",
1310 options.xauth_location, display,
1311 auth_proto, auth_data);
1315 "Adding %.*s/unix%s %s %s\n",
1316 (int)(screen-display), display,
1317 screen, auth_proto, auth_data);
1320 snprintf(cmd, sizeof cmd, "%s -q -",
1321 options.xauth_location);
1322 f = popen(cmd, "w");
1324 fprintf(f, "add %s %s %s\n", display,
1325 auth_proto, auth_data);
1328 fprintf(f, "add %.*s/unix%s %s %s\n",
1329 (int)(screen-display), display,
1330 screen, auth_proto, auth_data);
1334 fprintf(stderr, "Could not run %s\n",
1339 /* Get the last component of the shell name. */
1340 cp = strrchr(shell, '/');
1347 * If we have no command, execute the shell. In this case, the shell
1348 * name to be passed in argv[0] is preceded by '-' to indicate that
1349 * this is a login shell.
1352 if (!options.use_login) {
1356 * Check for mail if we have a tty and it was enabled
1357 * in server options.
1359 if (ttyname && options.check_mail) {
1361 struct stat mailstat;
1362 mailbox = getenv("MAIL");
1363 if (mailbox != NULL) {
1364 if (stat(mailbox, &mailstat) != 0 ||
1365 mailstat.st_size == 0)
1366 printf("No mail.\n");
1367 else if (mailstat.st_mtime < mailstat.st_atime)
1368 printf("You have mail.\n");
1370 printf("You have new mail.\n");
1373 /* Start the shell. Set initial character to '-'. */
1375 strncpy(buf + 1, cp, sizeof(buf) - 1);
1376 buf[sizeof(buf) - 1] = 0;
1378 /* Execute the shell. */
1381 execve(shell, argv, env);
1383 /* Executing the shell failed. */
1388 /* Launch login(1). */
1390 execl(LOGIN_PROGRAM, "login", "-h", hostname,
1391 "-p", "-f", "--", pw->pw_name, NULL);
1393 /* Login couldn't be executed, die. */
1400 * Execute the command using the user's shell. This uses the -c
1401 * option to execute the command.
1403 argv[0] = (char *) cp;
1405 argv[2] = (char *) command;
1407 execve(shell, argv, env);
1416 static int did_init = 0;
1418 debug("session_new: init");
1419 for(i = 0; i < MAX_SESSIONS; i++) {
1420 sessions[i].used = 0;
1421 sessions[i].self = i;
1425 for(i = 0; i < MAX_SESSIONS; i++) {
1426 Session *s = &sessions[i];
1437 s->auth_data = NULL;
1438 s->auth_proto = NULL;
1441 debug("session_new: session %d", i);
1452 for(i = 0; i < MAX_SESSIONS; i++) {
1453 Session *s = &sessions[i];
1454 debug("dump: used %d session %d %p channel %d pid %d",
1464 session_open(int chanid)
1466 Session *s = session_new();
1467 debug("session_open: channel %d", chanid);
1469 error("no more sessions");
1472 s->pw = auth_get_user();
1474 fatal("no user for session %i", s->self);
1475 debug("session_open: session %d: link with channel %d", s->self, chanid);
1481 session_by_channel(int id)
1484 for(i = 0; i < MAX_SESSIONS; i++) {
1485 Session *s = &sessions[i];
1486 if (s->used && s->chanid == id) {
1487 debug("session_by_channel: session %d channel %d", i, id);
1491 debug("session_by_channel: unknown channel %d", id);
1497 session_by_pid(pid_t pid)
1500 debug("session_by_pid: pid %d", pid);
1501 for(i = 0; i < MAX_SESSIONS; i++) {
1502 Session *s = &sessions[i];
1503 if (s->used && s->pid == pid)
1506 error("session_by_pid: unknown pid %d", pid);
1512 session_window_change_req(Session *s)
1514 s->col = packet_get_int();
1515 s->row = packet_get_int();
1516 s->xpixel = packet_get_int();
1517 s->ypixel = packet_get_int();
1519 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1524 session_pty_req(Session *s)
1527 char *term_modes; /* encoded terminal modes */
1533 s->term = packet_get_string(&len);
1534 s->col = packet_get_int();
1535 s->row = packet_get_int();
1536 s->xpixel = packet_get_int();
1537 s->ypixel = packet_get_int();
1538 term_modes = packet_get_string(&len);
1541 if (strcmp(s->term, "") == 0) {
1545 /* Allocate a pty and open it. */
1546 if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) {
1551 error("session_pty_req: session %d alloc failed", s->self);
1555 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1557 * Add a cleanup function to clear the utmp entry and record logout
1558 * time in case we call fatal() (e.g., the connection gets closed).
1560 fatal_add_cleanup(pty_cleanup_proc, (void *)s);
1561 pty_setowner(s->pw, s->tty);
1562 /* Get window size from the packet. */
1563 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1565 session_proctitle(s);
1567 /* XXX parse and set terminal modes */
1573 session_subsystem_req(Session *s)
1577 char *subsys = packet_get_string(&len);
1581 log("subsystem request for %s", subsys);
1583 for (i = 0; i < options.num_subsystems; i++) {
1584 if(strcmp(subsys, options.subsystem_name[i]) == 0) {
1585 debug("subsystem: exec() %s", options.subsystem_command[i]);
1586 do_exec_no_pty(s, options.subsystem_command[i], s->pw);
1592 log("subsystem request for %s failed, subsystem not found", subsys);
1599 session_x11_req(Session *s)
1602 if (no_x11_forwarding_flag) {
1603 debug("X11 forwarding disabled in user configuration file.");
1606 if (!options.x11_forwarding) {
1607 debug("X11 forwarding disabled in server configuration file.");
1610 if (xauthfile != NULL) {
1611 debug("X11 fwd already started.");
1615 debug("Received request for X11 forwarding with auth spoofing.");
1616 if (s->display != NULL)
1617 packet_disconnect("Protocol error: X11 display already set.");
1619 s->single_connection = packet_get_char();
1620 s->auth_proto = packet_get_string(NULL);
1621 s->auth_data = packet_get_string(NULL);
1622 s->screen = packet_get_int();
1625 s->display = x11_create_display_inet(s->screen, options.x11_display_offset);
1626 if (s->display == NULL) {
1627 xfree(s->auth_proto);
1628 xfree(s->auth_data);
1631 xauthfile = xmalloc(MAXPATHLEN);
1632 strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
1633 temporarily_use_uid(s->pw->pw_uid);
1634 if (mkdtemp(xauthfile) == NULL) {
1636 error("private X11 dir: mkdtemp %s failed: %s",
1637 xauthfile, strerror(errno));
1640 xfree(s->auth_proto);
1641 xfree(s->auth_data);
1642 /* XXXX remove listening channels */
1645 strlcat(xauthfile, "/cookies", MAXPATHLEN);
1646 fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
1650 fatal_add_cleanup(xauthfile_cleanup_proc, s);
1655 session_shell_req(Session *s)
1657 /* if forced_command == NULL, the shell is execed */
1658 char *shell = forced_command;
1662 do_exec_no_pty(s, shell, s->pw);
1664 do_exec_pty(s, shell, s->pw);
1669 session_exec_req(Session *s)
1672 char *command = packet_get_string(&len);
1674 if (forced_command) {
1675 original_command = command;
1676 command = forced_command;
1677 debug("Forced command '%.500s'", forced_command);
1681 do_exec_no_pty(s, command, s->pw);
1683 do_exec_pty(s, command, s->pw);
1684 if (forced_command == NULL)
1690 session_input_channel_req(int id, void *arg)
1699 rtype = packet_get_string(&len);
1700 reply = packet_get_char();
1702 s = session_by_channel(id);
1704 fatal("session_input_channel_req: channel %d: no session", id);
1705 c = channel_lookup(id);
1707 fatal("session_input_channel_req: channel %d: bad channel", id);
1709 debug("session_input_channel_req: session %d channel %d request %s reply %d",
1710 s->self, id, rtype, reply);
1713 * a session is in LARVAL state until a shell
1714 * or programm is executed
1716 if (c->type == SSH_CHANNEL_LARVAL) {
1717 if (strcmp(rtype, "shell") == 0) {
1718 success = session_shell_req(s);
1719 } else if (strcmp(rtype, "exec") == 0) {
1720 success = session_exec_req(s);
1721 } else if (strcmp(rtype, "pty-req") == 0) {
1722 success = session_pty_req(s);
1723 } else if (strcmp(rtype, "x11-req") == 0) {
1724 success = session_x11_req(s);
1725 } else if (strcmp(rtype, "subsystem") == 0) {
1726 success = session_subsystem_req(s);
1729 if (strcmp(rtype, "window-change") == 0) {
1730 success = session_window_change_req(s);
1734 packet_start(success ?
1735 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1736 packet_put_int(c->remote_id);
1743 session_set_fds(Session *s, int fdin, int fdout, int fderr)
1746 fatal("session_set_fds: called for proto != 2.0");
1748 * now that have a child and a pipe to the child,
1749 * we can activate our channel and register the fd's
1751 if (s->chanid == -1)
1752 fatal("no channel for session %d", s->self);
1753 channel_set_fds(s->chanid,
1755 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ);
1759 session_pty_cleanup(Session *s)
1761 if (s == NULL || s->ttyfd == -1)
1764 debug("session_pty_cleanup: session %i release %s", s->self, s->tty);
1766 /* Cancel the cleanup function. */
1767 fatal_remove_cleanup(pty_cleanup_proc, (void *)s);
1769 /* Record that the user has logged out. */
1770 record_logout(s->pid, s->tty);
1772 /* Release the pseudo-tty. */
1773 pty_release(s->tty);
1776 * Close the server side of the socket pairs. We must do this after
1777 * the pty cleanup, so that another process doesn't get this pty
1778 * while we're still cleaning up.
1780 if (close(s->ptymaster) < 0)
1781 error("close(s->ptymaster): %s", strerror(errno));
1785 session_exit_message(Session *s, int status)
1789 fatal("session_close: no session");
1790 c = channel_lookup(s->chanid);
1792 fatal("session_close: session %d: no channel %d",
1793 s->self, s->chanid);
1794 debug("session_exit_message: session %d channel %d pid %d",
1795 s->self, s->chanid, s->pid);
1797 if (WIFEXITED(status)) {
1798 channel_request_start(s->chanid,
1800 packet_put_int(WEXITSTATUS(status));
1802 } else if (WIFSIGNALED(status)) {
1803 channel_request_start(s->chanid,
1805 packet_put_int(WTERMSIG(status));
1807 packet_put_char(WCOREDUMP(status));
1808 #else /* WCOREDUMP */
1810 #endif /* WCOREDUMP */
1811 packet_put_cstring("");
1812 packet_put_cstring("");
1815 /* Some weird exit cause. Just exit. */
1816 packet_disconnect("wait returned status %04x.", status);
1819 /* disconnect channel */
1820 debug("session_exit_message: release channel %d", s->chanid);
1821 channel_cancel_cleanup(s->chanid);
1823 * emulate a write failure with 'chan_write_failed', nobody will be
1824 * interested in data we write.
1825 * Note that we must not call 'chan_read_failed', since there could
1826 * be some more data waiting in the pipe.
1828 if (c->ostate != CHAN_OUTPUT_CLOSED)
1829 chan_write_failed(c);
1834 session_free(Session *s)
1836 debug("session_free: session %d pid %d", s->self, s->pid);
1842 xfree(s->auth_data);
1844 xfree(s->auth_proto);
1849 session_close(Session *s)
1851 session_pty_cleanup(s);
1853 session_proctitle(s);
1857 session_close_by_pid(pid_t pid, int status)
1859 Session *s = session_by_pid(pid);
1861 debug("session_close_by_pid: no session for pid %d", s->pid);
1864 if (s->chanid != -1)
1865 session_exit_message(s, status);
1870 * this is called when a channel dies before
1871 * the session 'child' itself dies
1874 session_close_by_channel(int id, void *arg)
1876 Session *s = session_by_channel(id);
1878 debug("session_close_by_channel: no session for channel %d", id);
1881 /* disconnect channel */
1882 channel_cancel_cleanup(s->chanid);
1885 debug("session_close_by_channel: channel %d kill %d", id, s->pid);
1887 /* close session immediately */
1890 /* notify child, delay session cleanup */
1892 fatal("session_close_by_channel: Unsafe s->pid = %d", s->pid);
1893 if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0)
1894 error("session_close_by_channel: kill %d: %s",
1895 s->pid, strerror(errno));
1900 session_tty_list(void)
1902 static char buf[1024];
1905 for(i = 0; i < MAX_SESSIONS; i++) {
1906 Session *s = &sessions[i];
1907 if (s->used && s->ttyfd != -1) {
1909 strlcat(buf, ",", sizeof buf);
1910 strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
1914 strlcpy(buf, "notty", sizeof buf);
1919 session_proctitle(Session *s)
1922 error("no user for session %d", s->self);
1924 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1928 do_authenticated2(void)
1930 #ifdef HAVE_LOGIN_CAP
1935 * Cancel the alarm we set to limit the time taken for
1939 if (startup_pipe != -1) {
1940 close(startup_pipe);
1943 #ifdef HAVE_LOGIN_CAP
1944 pw = auth_get_user();
1945 if ((lc = login_getclass(pw->pw_class)) == NULL) {
1946 error("unable to get login class");
1952 xauthfile_cleanup_proc(NULL);