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 1.38 2000/10/11 20:27:23 markus Exp $");
53 #include "auth-options.h"
55 #ifdef WITH_IRIX_PROJECT
57 #endif /* WITH_IRIX_PROJECT */
59 #if defined(HAVE_USERSEC_H)
70 #include <sys/cygwin.h>
71 #define is_winnt (GetVersion() < 0x80000000)
75 #if defined(HAVE_GETUSERATTR) && !defined(S_UFSIZE_HARD) && defined(S_UFSIZE)
76 # define S_UFSIZE_HARD S_UFSIZE "_hard"
77 # define S_UCPU_HARD S_UCPU "_hard"
78 # define S_UDATA_HARD S_UDATA "_hard"
79 # define S_USTACK_HARD S_USTACK "_hard"
80 # define S_URSS_HARD S_URSS "_hard"
81 # define S_UCORE_HARD S_UCORE "_hard"
82 # define S_UNOFILE_HARD S_UNOFILE "_hard"
86 #include <login_cap.h>
92 typedef struct Session Session;
101 int ptyfd, ttyfd, ptymaster;
102 int row, col, xpixel, ypixel;
109 int single_connection;
116 Session *session_new(void);
117 void session_set_fds(Session *s, int fdin, int fdout, int fderr);
118 void session_pty_cleanup(Session *s);
119 void session_proctitle(Session *s);
120 void do_exec_pty(Session *s, const char *command, struct passwd * pw);
121 void do_exec_no_pty(Session *s, const char *command, struct passwd * pw);
122 void do_login(Session *s);
125 do_child(const char *command, struct passwd * pw, const char *term,
126 const char *display, const char *auth_proto,
127 const char *auth_data, const char *ttyname);
130 extern ServerOptions options;
131 #ifdef HAVE___PROGNAME
132 extern char *__progname;
133 #else /* HAVE___PROGNAME */
134 static const char *__progname = "sshd";
135 #endif /* HAVE___PROGNAME */
137 extern int log_stderr;
138 extern int debug_flag;
139 extern unsigned int utmp_len;
141 extern int startup_pipe;
143 /* Local Xauthority file. */
144 static char *xauthfile;
146 /* original command from peer. */
147 char *original_command = NULL;
150 #define MAX_SESSIONS 10
151 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 #if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD)
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 signal(SIGPIPE, SIG_DFL);
480 session_proctitle(s);
486 /* Fork the child. */
487 if ((pid = fork()) == 0) {
488 /* Child. Reinitialize the log since the pid has changed. */
489 log_init(__progname, options.log_level, options.log_facility, log_stderr);
492 * Create a new session and process group since the 4.4BSD
493 * setlogin() affects the entire process group.
496 error("setsid failed: %.100s", strerror(errno));
500 * Redirect stdin. We close the parent side of the socket
501 * pair, and make the child side the standard input.
504 if (dup2(pin[0], 0) < 0)
505 perror("dup2 stdin");
508 /* Redirect stdout. */
510 if (dup2(pout[1], 1) < 0)
511 perror("dup2 stdout");
514 /* Redirect stderr. */
516 if (dup2(perr[1], 2) < 0)
517 perror("dup2 stderr");
519 #else /* USE_PIPES */
521 * Redirect stdin, stdout, and stderr. Stdin and stdout will
522 * use the same socket, as some programs (particularly rdist)
523 * seem to depend on it.
527 if (dup2(inout[0], 0) < 0) /* stdin */
528 perror("dup2 stdin");
529 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
530 perror("dup2 stdout");
531 if (dup2(err[0], 2) < 0) /* stderr */
532 perror("dup2 stderr");
533 #endif /* USE_PIPES */
535 /* Do processing for the child (exec command etc). */
536 do_child(command, pw, NULL, s->display, s->auth_proto, s->auth_data, NULL);
541 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
544 packet_disconnect("fork failed: %.100s", strerror(errno));
547 /* We are the parent. Close the child sides of the pipes. */
553 session_set_fds(s, pin[1], pout[0], s->extended ? perr[0] : -1);
555 /* Enter the interactive session. */
556 server_loop(pid, pin[1], pout[0], perr[0]);
557 /* server_loop has closed pin[1], pout[1], and perr[1]. */
559 #else /* USE_PIPES */
560 /* We are the parent. Close the child sides of the socket pairs. */
565 * Enter the interactive session. Note: server_loop must be able to
566 * handle the case that fdin and fdout are the same.
569 session_set_fds(s, inout[1], inout[1], s->extended ? err[1] : -1);
571 server_loop(pid, inout[1], inout[1], err[1]);
572 /* server_loop has closed inout[1] and err[1]. */
574 #endif /* USE_PIPES */
578 * This is called to fork and execute a command when we have a tty. This
579 * will call do_child from the child, and server_loop from the parent after
580 * setting up file descriptors, controlling tty, updating wtmp, utmp,
581 * lastlog, and other such operations.
584 do_exec_pty(Session *s, const char *command, struct passwd * pw)
586 int fdout, ptyfd, ttyfd, ptymaster;
590 fatal("do_exec_pty: no session");
595 do_pam_session(pw->pw_name, s->tty);
599 /* Fork the child. */
600 if ((pid = fork()) == 0) {
601 /* Child. Reinitialize the log because the pid has changed. */
602 log_init(__progname, options.log_level, options.log_facility, log_stderr);
604 /* Close the master side of the pseudo tty. */
607 /* Make the pseudo tty our controlling tty. */
608 pty_make_controlling_tty(&ttyfd, s->tty);
610 /* Redirect stdin from the pseudo tty. */
611 if (dup2(ttyfd, fileno(stdin)) < 0)
612 error("dup2 stdin failed: %.100s", strerror(errno));
614 /* Redirect stdout to the pseudo tty. */
615 if (dup2(ttyfd, fileno(stdout)) < 0)
616 error("dup2 stdin failed: %.100s", strerror(errno));
618 /* Redirect stderr to the pseudo tty. */
619 if (dup2(ttyfd, fileno(stderr)) < 0)
620 error("dup2 stdin failed: %.100s", strerror(errno));
622 /* Close the extra descriptor for the pseudo tty. */
625 /* record login, etc. similar to login(1) */
626 if (command == NULL && !options.use_login)
629 /* Do common processing for the child, such as execing the command. */
630 do_child(command, pw, s->term, s->display, s->auth_proto,
631 s->auth_data, s->tty);
636 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
639 packet_disconnect("fork failed: %.100s", strerror(errno));
642 /* Parent. Close the slave side of the pseudo tty. */
646 * Create another descriptor of the pty master side for use as the
647 * standard input. We could use the original descriptor, but this
648 * simplifies code in server_loop. The descriptor is bidirectional.
652 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
654 /* we keep a reference to the pty master */
655 ptymaster = dup(ptyfd);
657 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
658 s->ptymaster = ptymaster;
660 /* Enter interactive session. */
662 session_set_fds(s, ptyfd, fdout, -1);
664 server_loop(pid, ptyfd, fdout, -1);
665 /* server_loop _has_ closed ptyfd and fdout. */
666 session_pty_cleanup(s);
671 get_remote_name_or_ip(void)
673 static const char *remote = "";
675 remote = get_canonical_hostname();
676 if (utmp_len == 0 || strlen(remote) > utmp_len)
677 remote = get_remote_ipaddr();
681 /* administrative, login(1)-like work */
688 char hostname[MAXHOSTNAMELEN];
690 struct sockaddr_storage from;
692 time_t last_login_time;
693 struct passwd * pw = s->pw;
694 pid_t pid = getpid();
697 * Get IP address of client. If the connection is not a socket, let
698 * the address be 0.0.0.0.
700 memset(&from, 0, sizeof(from));
701 if (packet_connection_is_on_socket()) {
702 fromlen = sizeof(from);
703 if (getpeername(packet_get_connection_in(),
704 (struct sockaddr *) & from, &fromlen) < 0) {
705 debug("getpeername: %.100s", strerror(errno));
710 /* Get the time and hostname when the user last logged in. */
712 last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name,
713 hostname, sizeof(hostname));
715 /* Record that there was a login on that tty from the remote host. */
716 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
717 get_remote_name_or_ip(), (struct sockaddr *)&from);
721 * If password change is needed, do it now.
722 * This needs to occur before the ~/.hushlogin check.
724 if (pam_password_change_required()) {
725 print_pam_messages();
730 /* Done if .hushlogin exists. */
731 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
732 #ifdef HAVE_LOGIN_CAP
733 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
735 if (stat(buf, &st) >= 0)
740 if (!pam_password_change_required())
741 print_pam_messages();
743 #ifdef WITH_AIXAUTHENTICATE
744 if (aixloginmsg && *aixloginmsg)
745 printf("%s\n", aixloginmsg);
746 #endif /* WITH_AIXAUTHENTICATE */
748 if (last_login_time != 0) {
749 time_string = ctime(&last_login_time);
750 if (strchr(time_string, '\n'))
751 *strchr(time_string, '\n') = 0;
752 if (strcmp(hostname, "") == 0)
753 printf("Last login: %s\r\n", time_string);
755 printf("Last login: %s from %s\r\n", time_string, hostname);
757 if (options.print_motd) {
758 #ifdef HAVE_LOGIN_CAP
759 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
762 f = fopen("/etc/motd", "r");
765 while (fgets(buf, sizeof(buf), f))
773 * Sets the value of the given variable in the environment. If the variable
774 * already exists, its value is overriden.
777 child_set_env(char ***envp, unsigned int *envsizep, const char *name,
780 unsigned int i, namelen;
784 * Find the slot where the value should be stored. If the variable
785 * already exists, we reuse the slot; otherwise we append a new slot
786 * at the end of the array, expanding if necessary.
789 namelen = strlen(name);
790 for (i = 0; env[i]; i++)
791 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
794 /* Reuse the slot. */
797 /* New variable. Expand if necessary. */
798 if (i >= (*envsizep) - 1) {
800 env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *));
802 /* Need to set the NULL pointer at end of array beyond the new slot. */
806 /* Allocate space and format the variable in the appropriate slot. */
807 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
808 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
812 * Reads environment variables from the given file and adds/overrides them
813 * into the environment. If the file does not exist, this does nothing.
814 * Otherwise, it must consist of empty lines, comments (line starts with '#')
815 * and assignments of the form name=value. No other forms are allowed.
818 read_environment_file(char ***env, unsigned int *envsize,
819 const char *filename)
825 f = fopen(filename, "r");
829 while (fgets(buf, sizeof(buf), f)) {
830 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
832 if (!*cp || *cp == '#' || *cp == '\n')
834 if (strchr(cp, '\n'))
835 *strchr(cp, '\n') = '\0';
836 value = strchr(cp, '=');
838 fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf);
842 * Replace the equals sign by nul, and advance value to
847 child_set_env(env, envsize, cp, value);
854 * Sets any environment variables which have been specified by PAM
856 void do_pam_environment(char ***env, int *envsize)
858 char *equals, var_name[512], var_val[512];
862 if ((pam_env = fetch_pam_environment()) == NULL)
865 for(i = 0; pam_env[i] != NULL; i++) {
866 if ((equals = strstr(pam_env[i], "=")) == NULL)
869 if (strlen(pam_env[i]) < (sizeof(var_name) - 1)) {
870 memset(var_name, '\0', sizeof(var_name));
871 memset(var_val, '\0', sizeof(var_val));
873 strncpy(var_name, pam_env[i], equals - pam_env[i]);
874 strcpy(var_val, equals + 1);
876 debug3("PAM environment: %s=%s", var_name, var_val);
878 child_set_env(env, envsize, var_name, var_val);
886 void copy_environment(char ***env, int *envsize)
888 char *equals, var_name[512], var_val[512];
891 for(i = 0; environ[i] != NULL; i++) {
892 if ((equals = strstr(environ[i], "=")) == NULL)
895 if (strlen(environ[i]) < (sizeof(var_name) - 1)) {
896 memset(var_name, '\0', sizeof(var_name));
897 memset(var_val, '\0', sizeof(var_val));
899 strncpy(var_name, environ[i], equals - environ[i]);
900 strcpy(var_val, equals + 1);
902 debug3("Copy environment: %s=%s", var_name, var_val);
904 child_set_env(env, envsize, var_name, var_val);
910 #if defined(HAVE_GETUSERATTR)
912 * AIX-specific login initialisation
914 void set_limit(char *user, char *soft, char *hard, int resource, int mult)
919 getrlimit(resource, &rlim);
922 if (getuserattr(user, soft, &slim, SEC_INT) != -1) {
924 rlim.rlim_cur = RLIM_INFINITY;
925 } else if (slim != 0) {
926 /* See the wackiness below */
927 if (rlim.rlim_cur == slim * mult)
930 rlim.rlim_cur = slim * mult;
935 if (getuserattr(user, hard, &hlim, SEC_INT) != -1) {
937 rlim.rlim_max = RLIM_INFINITY;
938 } else if (hlim != 0) {
939 rlim.rlim_max = hlim * mult;
944 * XXX For cpu and fsize the soft limit is set to the hard limit
945 * if the hard limit is left at its default value and the soft limit
946 * is changed from its default value, either by requesting it
947 * (slim == 0) or by setting it to the current default. At least
948 * that's how rlogind does it. If you're confused you're not alone.
949 * Bug or feature? AIX 4.3.1.2
951 if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu"))
952 && hlim == 0 && slim != 0)
953 rlim.rlim_max = rlim.rlim_cur;
954 /* A specified hard limit limits the soft limit */
955 else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max)
956 rlim.rlim_cur = rlim.rlim_max;
957 /* A soft limit can increase a hard limit */
958 else if (rlim.rlim_cur > rlim.rlim_max)
959 rlim.rlim_max = rlim.rlim_cur;
961 if (setrlimit(resource, &rlim) != 0)
962 error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno));
965 void set_limits_from_userattr(char *user)
970 set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512);
971 set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1);
972 set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512);
973 set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512);
974 set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512);
975 set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512);
976 #if defined(S_UNOFILE)
977 set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1);
980 if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) {
981 /* Convert decimal to octal */
982 (void) snprintf(buf, sizeof(buf), "%d", mask);
983 if (sscanf(buf, "%o", &mask) == 1)
987 #endif /* defined(HAVE_GETUSERATTR) */
990 * Performs common processing for the child, such as setting up the
991 * environment, closing extra file descriptors, setting the user and group
992 * ids, and executing the command or shell.
995 do_child(const char *command, struct passwd * pw, const char *term,
996 const char *display, const char *auth_proto,
997 const char *auth_data, const char *ttyname)
999 const char *shell, *hostname = NULL, *cp = NULL;
1003 unsigned int envsize, i;
1005 extern char **environ;
1008 #ifdef WITH_IRIX_PROJECT
1010 #endif /* WITH_IRIX_PROJECT */
1012 /* login(1) is only called if we execute the login shell */
1013 if (options.use_login && command != NULL)
1014 options.use_login = 0;
1016 #ifndef USE_PAM /* pam_nologin handles this */
1017 if (!options.use_login) {
1018 # ifdef HAVE_LOGIN_CAP
1019 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
1020 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
1021 _PATH_NOLOGIN), "r");
1022 # else /* HAVE_LOGIN_CAP */
1024 f = fopen(_PATH_NOLOGIN, "r");
1025 # endif /* HAVE_LOGIN_CAP */
1027 /* /etc/nologin exists. Print its contents and exit. */
1028 while (fgets(buf, sizeof(buf), f))
1034 #endif /* USE_PAM */
1036 /* Set login name, uid, gid, and groups. */
1037 /* Login(1) does this as well, and it needs uid 0 for the "-h"
1038 switch, so we let login(1) to this for us. */
1039 if (!options.use_login) {
1041 extern char **saved_argv;
1042 extern int saved_argc;
1043 char *host = get_canonical_hostname ();
1045 if (sia_become_user(NULL, saved_argc, saved_argv, host,
1046 pw->pw_name, ttyname, 0, NULL, NULL, SIA_BEU_SETLUID) !=
1048 perror("sia_become_user");
1051 if (setreuid(geteuid(), geteuid()) < 0) {
1055 #else /* HAVE_OSF_SIA */
1059 if (getuid() == 0 || geteuid() == 0) {
1061 # ifdef HAVE_GETUSERATTR
1062 set_limits_from_userattr(pw->pw_name);
1063 # endif /* HAVE_GETUSERATTR */
1064 # ifdef HAVE_LOGIN_CAP
1065 if (setusercontext(lc, pw, pw->pw_uid,
1066 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1067 perror("unable to set user context");
1070 # else /* HAVE_LOGIN_CAP */
1071 if (setlogin(pw->pw_name) < 0)
1072 error("setlogin failed: %s", strerror(errno));
1073 if (setgid(pw->pw_gid) < 0) {
1077 /* Initialize the group list. */
1078 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1079 perror("initgroups");
1083 # ifdef WITH_IRIX_ARRAY
1084 /* initialize array session */
1085 if (newarraysess() != 0)
1086 fatal("Failed to set up new array session: %.100s",
1088 # endif /* WITH_IRIX_ARRAY */
1089 # ifdef WITH_IRIX_PROJECT
1090 /* initialize irix project info */
1091 if ((projid = getdfltprojuser(pw->pw_name)) == -1) {
1092 debug("Failed to get project id, using projid 0");
1095 if (setprid(projid))
1096 fatal("Failed to initialize project %d for %s: %.100s",
1097 (int)projid, pw->pw_name, strerror(errno));
1098 # endif /* WITH_IRIX_PROJECT */
1099 /* Permanently switch to the desired uid. */
1100 permanently_set_uid(pw->pw_uid);
1101 # endif /* HAVE_LOGIN_CAP */
1103 #endif /* HAVE_OSF_SIA */
1108 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1109 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1112 * Get the shell from the password data. An empty shell field is
1113 * legal, and means /bin/sh.
1115 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1116 #ifdef HAVE_LOGIN_CAP
1117 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1121 /* Try to get AFS tokens for the local cell. */
1125 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1126 krb_afslog(cell, 0);
1132 /* Initialize the environment. */
1134 env = xmalloc(envsize * sizeof(char *));
1139 * The Windows environment contains some setting which are
1140 * important for a running system. They must not be dropped.
1142 copy_environment(&env, &envsize);
1145 if (!options.use_login) {
1146 /* Set basic environment. */
1147 child_set_env(&env, &envsize, "USER", pw->pw_name);
1148 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
1149 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
1150 #ifdef HAVE_LOGIN_CAP
1151 (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH);
1152 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
1153 #else /* HAVE_LOGIN_CAP */
1154 # ifndef HAVE_CYGWIN
1156 * There's no standard path on Windows. The path contains
1157 * important components pointing to the system directories,
1158 * needed for loading shared libraries. So the path better
1159 * remains intact here.
1161 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
1162 # endif /* HAVE_CYGWIN */
1163 #endif /* HAVE_LOGIN_CAP */
1165 snprintf(buf, sizeof buf, "%.200s/%.50s",
1166 _PATH_MAILDIR, pw->pw_name);
1167 child_set_env(&env, &envsize, "MAIL", buf);
1169 /* Normal systems set SHELL by default. */
1170 child_set_env(&env, &envsize, "SHELL", shell);
1173 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1175 /* Set custom environment options from RSA authentication. */
1176 while (custom_environment) {
1177 struct envstring *ce = custom_environment;
1180 for (i = 0; s[i] != '=' && s[i]; i++);
1183 child_set_env(&env, &envsize, s, s + i + 1);
1185 custom_environment = ce->next;
1190 snprintf(buf, sizeof buf, "%.50s %d %d",
1191 get_remote_ipaddr(), get_remote_port(), get_local_port());
1192 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1195 child_set_env(&env, &envsize, "SSH_TTY", ttyname);
1197 child_set_env(&env, &envsize, "TERM", term);
1199 child_set_env(&env, &envsize, "DISPLAY", display);
1200 if (original_command)
1201 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
1205 if ((cp = getenv("AUTHSTATE")) != NULL)
1206 child_set_env(&env, &envsize, "AUTHSTATE", cp);
1207 if ((cp = getenv("KRB5CCNAME")) != NULL)
1208 child_set_env(&env, &envsize, "KRB5CCNAME", cp);
1209 read_environment_file(&env, &envsize, "/etc/environment");
1214 extern char *ticket;
1217 child_set_env(&env, &envsize, "KRBTKFILE", ticket);
1222 /* Pull in any environment variables that may have been set by PAM. */
1223 do_pam_environment(&env, &envsize);
1224 #endif /* USE_PAM */
1227 child_set_env(&env, &envsize, "XAUTHORITY", xauthfile);
1228 if (auth_get_socket_name() != NULL)
1229 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1230 auth_get_socket_name());
1232 /* read $HOME/.ssh/environment. */
1233 if (!options.use_login) {
1234 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
1236 read_environment_file(&env, &envsize, buf);
1239 /* dump the environment */
1240 fprintf(stderr, "Environment:\n");
1241 for (i = 0; env[i]; i++)
1242 fprintf(stderr, " %.200s\n", env[i]);
1244 /* we have to stash the hostname before we close our socket. */
1245 if (options.use_login)
1246 hostname = get_remote_name_or_ip();
1248 * Close the connection descriptors; note that this is the child, and
1249 * the server will still have the socket open, and it is important
1250 * that we do not shutdown it. Note that the descriptors cannot be
1251 * closed before building the environment, as we call
1252 * get_remote_ipaddr there.
1254 if (packet_get_connection_in() == packet_get_connection_out())
1255 close(packet_get_connection_in());
1257 close(packet_get_connection_in());
1258 close(packet_get_connection_out());
1261 * Close all descriptors related to channels. They will still remain
1262 * open in the parent.
1264 /* XXX better use close-on-exec? -markus */
1265 channel_close_all();
1268 * Close any extra file descriptors. Note that there may still be
1269 * descriptors left by system functions. They will be closed later.
1274 * Close any extra open file descriptors so that we don\'t have them
1275 * hanging around in clients. Note that we want to do this after
1276 * initgroups, because at least on Solaris 2.3 it leaves file
1279 for (i = 3; i < 64; i++)
1282 /* Change current directory to the user\'s home directory. */
1283 if (chdir(pw->pw_dir) < 0) {
1284 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1285 pw->pw_dir, strerror(errno));
1286 #ifdef HAVE_LOGIN_CAP
1287 if (login_getcapbool(lc, "requirehome", 0))
1293 * Must take new environment into use so that .ssh/rc, /etc/sshrc and
1294 * xauth are run in the proper environment.
1299 * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first
1302 if (!options.use_login) {
1303 if (stat(SSH_USER_RC, &st) >= 0) {
1305 fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_USER_RC);
1307 f = popen(_PATH_BSHELL " " SSH_USER_RC, "w");
1309 if (auth_proto != NULL && auth_data != NULL)
1310 fprintf(f, "%s %s\n", auth_proto, auth_data);
1313 fprintf(stderr, "Could not run %s\n", SSH_USER_RC);
1314 } else if (stat(SSH_SYSTEM_RC, &st) >= 0) {
1316 fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_SYSTEM_RC);
1318 f = popen(_PATH_BSHELL " " SSH_SYSTEM_RC, "w");
1320 if (auth_proto != NULL && auth_data != NULL)
1321 fprintf(f, "%s %s\n", auth_proto, auth_data);
1324 fprintf(stderr, "Could not run %s\n", SSH_SYSTEM_RC);
1325 } else if (options.xauth_location != NULL) {
1326 /* Add authority data to .Xauthority if appropriate. */
1327 if (auth_proto != NULL && auth_data != NULL) {
1328 char *screen = strchr(display, ':');
1331 "Running %.100s add %.100s %.100s %.100s\n",
1332 options.xauth_location, display,
1333 auth_proto, auth_data);
1334 #ifndef HAVE_CYGWIN /* Unix sockets are not supported */
1337 "Adding %.*s/unix%s %s %s\n",
1338 (int)(screen-display), display,
1339 screen, auth_proto, auth_data);
1342 snprintf(cmd, sizeof cmd, "%s -q -",
1343 options.xauth_location);
1344 f = popen(cmd, "w");
1346 fprintf(f, "add %s %s %s\n", display,
1347 auth_proto, auth_data);
1348 #ifndef HAVE_CYGWIN /* Unix sockets are not supported */
1350 fprintf(f, "add %.*s/unix%s %s %s\n",
1351 (int)(screen-display), display,
1352 screen, auth_proto, auth_data);
1356 fprintf(stderr, "Could not run %s\n",
1361 /* Get the last component of the shell name. */
1362 cp = strrchr(shell, '/');
1369 * If we have no command, execute the shell. In this case, the shell
1370 * name to be passed in argv[0] is preceded by '-' to indicate that
1371 * this is a login shell.
1374 if (!options.use_login) {
1378 * Check for mail if we have a tty and it was enabled
1379 * in server options.
1381 if (ttyname && options.check_mail) {
1383 struct stat mailstat;
1384 mailbox = getenv("MAIL");
1385 if (mailbox != NULL) {
1386 if (stat(mailbox, &mailstat) != 0 ||
1387 mailstat.st_size == 0)
1388 printf("No mail.\n");
1389 else if (mailstat.st_mtime < mailstat.st_atime)
1390 printf("You have mail.\n");
1392 printf("You have new mail.\n");
1395 /* Start the shell. Set initial character to '-'. */
1397 strncpy(buf + 1, cp, sizeof(buf) - 1);
1398 buf[sizeof(buf) - 1] = 0;
1400 /* Execute the shell. */
1403 execve(shell, argv, env);
1405 /* Executing the shell failed. */
1410 /* Launch login(1). */
1412 execl(LOGIN_PROGRAM, "login", "-h", hostname,
1413 "-p", "-f", "--", pw->pw_name, NULL);
1415 /* Login couldn't be executed, die. */
1422 * Execute the command using the user's shell. This uses the -c
1423 * option to execute the command.
1425 argv[0] = (char *) cp;
1427 argv[2] = (char *) command;
1429 execve(shell, argv, env);
1438 static int did_init = 0;
1440 debug("session_new: init");
1441 for(i = 0; i < MAX_SESSIONS; i++) {
1442 sessions[i].used = 0;
1443 sessions[i].self = i;
1447 for(i = 0; i < MAX_SESSIONS; i++) {
1448 Session *s = &sessions[i];
1459 s->auth_data = NULL;
1460 s->auth_proto = NULL;
1463 debug("session_new: session %d", i);
1474 for(i = 0; i < MAX_SESSIONS; i++) {
1475 Session *s = &sessions[i];
1476 debug("dump: used %d session %d %p channel %d pid %d",
1486 session_open(int chanid)
1488 Session *s = session_new();
1489 debug("session_open: channel %d", chanid);
1491 error("no more sessions");
1494 s->pw = auth_get_user();
1496 fatal("no user for session %i", s->self);
1497 debug("session_open: session %d: link with channel %d", s->self, chanid);
1503 session_by_channel(int id)
1506 for(i = 0; i < MAX_SESSIONS; i++) {
1507 Session *s = &sessions[i];
1508 if (s->used && s->chanid == id) {
1509 debug("session_by_channel: session %d channel %d", i, id);
1513 debug("session_by_channel: unknown channel %d", id);
1519 session_by_pid(pid_t pid)
1522 debug("session_by_pid: pid %d", pid);
1523 for(i = 0; i < MAX_SESSIONS; i++) {
1524 Session *s = &sessions[i];
1525 if (s->used && s->pid == pid)
1528 error("session_by_pid: unknown pid %d", pid);
1534 session_window_change_req(Session *s)
1536 s->col = packet_get_int();
1537 s->row = packet_get_int();
1538 s->xpixel = packet_get_int();
1539 s->ypixel = packet_get_int();
1541 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1546 session_pty_req(Session *s)
1549 char *term_modes; /* encoded terminal modes */
1555 s->term = packet_get_string(&len);
1556 s->col = packet_get_int();
1557 s->row = packet_get_int();
1558 s->xpixel = packet_get_int();
1559 s->ypixel = packet_get_int();
1560 term_modes = packet_get_string(&len);
1563 if (strcmp(s->term, "") == 0) {
1567 /* Allocate a pty and open it. */
1568 if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) {
1573 error("session_pty_req: session %d alloc failed", s->self);
1577 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1579 * Add a cleanup function to clear the utmp entry and record logout
1580 * time in case we call fatal() (e.g., the connection gets closed).
1582 fatal_add_cleanup(pty_cleanup_proc, (void *)s);
1583 pty_setowner(s->pw, s->tty);
1584 /* Get window size from the packet. */
1585 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1587 session_proctitle(s);
1589 /* XXX parse and set terminal modes */
1595 session_subsystem_req(Session *s)
1599 char *subsys = packet_get_string(&len);
1603 log("subsystem request for %s", subsys);
1605 for (i = 0; i < options.num_subsystems; i++) {
1606 if(strcmp(subsys, options.subsystem_name[i]) == 0) {
1607 debug("subsystem: exec() %s", options.subsystem_command[i]);
1608 do_exec_no_pty(s, options.subsystem_command[i], s->pw);
1614 log("subsystem request for %s failed, subsystem not found", subsys);
1621 session_x11_req(Session *s)
1624 if (no_x11_forwarding_flag) {
1625 debug("X11 forwarding disabled in user configuration file.");
1628 if (!options.x11_forwarding) {
1629 debug("X11 forwarding disabled in server configuration file.");
1632 if (xauthfile != NULL) {
1633 debug("X11 fwd already started.");
1637 debug("Received request for X11 forwarding with auth spoofing.");
1638 if (s->display != NULL)
1639 packet_disconnect("Protocol error: X11 display already set.");
1641 s->single_connection = packet_get_char();
1642 s->auth_proto = packet_get_string(NULL);
1643 s->auth_data = packet_get_string(NULL);
1644 s->screen = packet_get_int();
1647 s->display = x11_create_display_inet(s->screen, options.x11_display_offset);
1648 if (s->display == NULL) {
1649 xfree(s->auth_proto);
1650 xfree(s->auth_data);
1653 xauthfile = xmalloc(MAXPATHLEN);
1654 strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
1655 temporarily_use_uid(s->pw->pw_uid);
1656 if (mkdtemp(xauthfile) == NULL) {
1658 error("private X11 dir: mkdtemp %s failed: %s",
1659 xauthfile, strerror(errno));
1662 xfree(s->auth_proto);
1663 xfree(s->auth_data);
1664 /* XXXX remove listening channels */
1667 strlcat(xauthfile, "/cookies", MAXPATHLEN);
1668 fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
1672 fatal_add_cleanup(xauthfile_cleanup_proc, s);
1677 session_shell_req(Session *s)
1679 /* if forced_command == NULL, the shell is execed */
1680 char *shell = forced_command;
1684 do_exec_no_pty(s, shell, s->pw);
1686 do_exec_pty(s, shell, s->pw);
1691 session_exec_req(Session *s)
1694 char *command = packet_get_string(&len);
1696 if (forced_command) {
1697 original_command = command;
1698 command = forced_command;
1699 debug("Forced command '%.500s'", forced_command);
1703 do_exec_no_pty(s, command, s->pw);
1705 do_exec_pty(s, command, s->pw);
1706 if (forced_command == NULL)
1712 session_input_channel_req(int id, void *arg)
1721 rtype = packet_get_string(&len);
1722 reply = packet_get_char();
1724 s = session_by_channel(id);
1726 fatal("session_input_channel_req: channel %d: no session", id);
1727 c = channel_lookup(id);
1729 fatal("session_input_channel_req: channel %d: bad channel", id);
1731 debug("session_input_channel_req: session %d channel %d request %s reply %d",
1732 s->self, id, rtype, reply);
1735 * a session is in LARVAL state until a shell
1736 * or programm is executed
1738 if (c->type == SSH_CHANNEL_LARVAL) {
1739 if (strcmp(rtype, "shell") == 0) {
1740 success = session_shell_req(s);
1741 } else if (strcmp(rtype, "exec") == 0) {
1742 success = session_exec_req(s);
1743 } else if (strcmp(rtype, "pty-req") == 0) {
1744 success = session_pty_req(s);
1745 } else if (strcmp(rtype, "x11-req") == 0) {
1746 success = session_x11_req(s);
1747 } else if (strcmp(rtype, "subsystem") == 0) {
1748 success = session_subsystem_req(s);
1751 if (strcmp(rtype, "window-change") == 0) {
1752 success = session_window_change_req(s);
1756 packet_start(success ?
1757 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1758 packet_put_int(c->remote_id);
1765 session_set_fds(Session *s, int fdin, int fdout, int fderr)
1768 fatal("session_set_fds: called for proto != 2.0");
1770 * now that have a child and a pipe to the child,
1771 * we can activate our channel and register the fd's
1773 if (s->chanid == -1)
1774 fatal("no channel for session %d", s->self);
1775 channel_set_fds(s->chanid,
1777 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ);
1781 session_pty_cleanup(Session *s)
1783 if (s == NULL || s->ttyfd == -1)
1786 debug("session_pty_cleanup: session %i release %s", s->self, s->tty);
1788 /* Cancel the cleanup function. */
1789 fatal_remove_cleanup(pty_cleanup_proc, (void *)s);
1791 /* Record that the user has logged out. */
1792 record_logout(s->pid, s->tty);
1794 /* Release the pseudo-tty. */
1795 pty_release(s->tty);
1798 * Close the server side of the socket pairs. We must do this after
1799 * the pty cleanup, so that another process doesn't get this pty
1800 * while we're still cleaning up.
1802 if (close(s->ptymaster) < 0)
1803 error("close(s->ptymaster): %s", strerror(errno));
1807 session_exit_message(Session *s, int status)
1811 fatal("session_close: no session");
1812 c = channel_lookup(s->chanid);
1814 fatal("session_close: session %d: no channel %d",
1815 s->self, s->chanid);
1816 debug("session_exit_message: session %d channel %d pid %d",
1817 s->self, s->chanid, s->pid);
1819 if (WIFEXITED(status)) {
1820 channel_request_start(s->chanid,
1822 packet_put_int(WEXITSTATUS(status));
1824 } else if (WIFSIGNALED(status)) {
1825 channel_request_start(s->chanid,
1827 packet_put_int(WTERMSIG(status));
1829 packet_put_char(WCOREDUMP(status));
1830 #else /* WCOREDUMP */
1832 #endif /* WCOREDUMP */
1833 packet_put_cstring("");
1834 packet_put_cstring("");
1837 /* Some weird exit cause. Just exit. */
1838 packet_disconnect("wait returned status %04x.", status);
1841 /* disconnect channel */
1842 debug("session_exit_message: release channel %d", s->chanid);
1843 channel_cancel_cleanup(s->chanid);
1845 * emulate a write failure with 'chan_write_failed', nobody will be
1846 * interested in data we write.
1847 * Note that we must not call 'chan_read_failed', since there could
1848 * be some more data waiting in the pipe.
1850 if (c->ostate != CHAN_OUTPUT_CLOSED)
1851 chan_write_failed(c);
1856 session_free(Session *s)
1858 debug("session_free: session %d pid %d", s->self, s->pid);
1864 xfree(s->auth_data);
1866 xfree(s->auth_proto);
1871 session_close(Session *s)
1873 session_pty_cleanup(s);
1875 session_proctitle(s);
1879 session_close_by_pid(pid_t pid, int status)
1881 Session *s = session_by_pid(pid);
1883 debug("session_close_by_pid: no session for pid %d", s->pid);
1886 if (s->chanid != -1)
1887 session_exit_message(s, status);
1892 * this is called when a channel dies before
1893 * the session 'child' itself dies
1896 session_close_by_channel(int id, void *arg)
1898 Session *s = session_by_channel(id);
1900 debug("session_close_by_channel: no session for channel %d", id);
1903 /* disconnect channel */
1904 channel_cancel_cleanup(s->chanid);
1907 debug("session_close_by_channel: channel %d kill %d", id, s->pid);
1909 /* close session immediately */
1912 /* notify child, delay session cleanup */
1914 fatal("session_close_by_channel: Unsafe s->pid = %d", s->pid);
1915 if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0)
1916 error("session_close_by_channel: kill %d: %s",
1917 s->pid, strerror(errno));
1922 session_tty_list(void)
1924 static char buf[1024];
1927 for(i = 0; i < MAX_SESSIONS; i++) {
1928 Session *s = &sessions[i];
1929 if (s->used && s->ttyfd != -1) {
1931 strlcat(buf, ",", sizeof buf);
1932 strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
1936 strlcpy(buf, "notty", sizeof buf);
1941 session_proctitle(Session *s)
1944 error("no user for session %d", s->self);
1946 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1950 do_authenticated2(void)
1952 #ifdef HAVE_LOGIN_CAP
1957 * Cancel the alarm we set to limit the time taken for
1961 if (startup_pipe != -1) {
1962 close(startup_pipe);
1965 #if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD)
1966 pw = auth_get_user();
1967 if ((lc = login_getclass(pw->pw_class)) == NULL) {
1968 error("unable to get login class");
1974 xauthfile_cleanup_proc(NULL);