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 1.43 2000/11/06 23:04:56 markus Exp $");
53 #include "auth-options.h"
55 #ifdef WITH_IRIX_PROJECT
57 #endif /* WITH_IRIX_PROJECT */
59 #include <sys/resource.h>
62 #if defined(HAVE_USERSEC_H)
73 #include <sys/cygwin.h>
74 #define is_winnt (GetVersion() < 0x80000000)
78 #if defined(HAVE_GETUSERATTR) && !defined(S_UFSIZE_HARD) && defined(S_UFSIZE)
79 # define S_UFSIZE_HARD S_UFSIZE "_hard"
80 # define S_UCPU_HARD S_UCPU "_hard"
81 # define S_UDATA_HARD S_UDATA "_hard"
82 # define S_USTACK_HARD S_USTACK "_hard"
83 # define S_URSS_HARD S_URSS "_hard"
84 # define S_UCORE_HARD S_UCORE "_hard"
85 # define S_UNOFILE_HARD S_UNOFILE "_hard"
89 #include <login_cap.h>
95 typedef struct Session Session;
104 int ptyfd, ttyfd, ptymaster;
105 int row, col, xpixel, ypixel;
112 int single_connection;
119 Session *session_new(void);
120 void session_set_fds(Session *s, int fdin, int fdout, int fderr);
121 void session_pty_cleanup(Session *s);
122 void session_proctitle(Session *s);
123 void do_exec_pty(Session *s, const char *command, struct passwd * pw);
124 void do_exec_no_pty(Session *s, const char *command, struct passwd * pw);
125 void do_login(Session *s, const char *command);
128 do_child(const char *command, struct passwd * pw, const char *term,
129 const char *display, const char *auth_proto,
130 const char *auth_data, const char *ttyname);
133 extern ServerOptions options;
134 #ifdef HAVE___PROGNAME
135 extern char *__progname;
136 #else /* HAVE___PROGNAME */
137 static const char *__progname = "sshd";
138 #endif /* HAVE___PROGNAME */
140 extern int log_stderr;
141 extern int debug_flag;
142 extern unsigned int utmp_len;
144 extern int startup_pipe;
146 /* Local Xauthority file. */
147 static char *xauthfile;
149 /* original command from peer. */
150 char *original_command = NULL;
153 #define MAX_SESSIONS 10
154 Session sessions[MAX_SESSIONS];
156 #ifdef WITH_AIXAUTHENTICATE
157 /* AIX's lastlogin message, set in auth1.c */
159 #endif /* WITH_AIXAUTHENTICATE */
161 #ifdef HAVE_LOGIN_CAP
162 static login_cap_t *lc;
166 * Remove local Xauthority file.
169 xauthfile_cleanup_proc(void *ignore)
171 debug("xauthfile_cleanup_proc called");
173 if (xauthfile != NULL) {
176 p = strrchr(xauthfile, '/');
187 * Function to perform cleanup if we get aborted abnormally (e.g., due to a
188 * dropped connection).
191 pty_cleanup_proc(void *session)
195 fatal("pty_cleanup_proc: no session");
196 debug("pty_cleanup_proc: %s", s->tty);
199 /* Record that the user has logged out. */
200 record_logout(s->pid, s->tty);
203 /* Release the pseudo-tty. */
208 * Prepares for an interactive session. This is called after the user has
209 * been successfully authenticated. During this message exchange, pseudo
210 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
211 * are requested, etc.
214 do_authenticated(struct passwd * pw)
218 int compression_level = 0, enable_compression_after_reply = 0;
223 unsigned int proto_len, data_len, dlen;
226 * Cancel the alarm we set to limit the time taken for
230 if (startup_pipe != -1) {
236 * Inform the channel mechanism that we are the server side and that
237 * the client may request to connect to any port at all. (The user
238 * could do it anyway, and we wouldn\'t know what is permitted except
239 * by the client telling us, so we can equally well trust the client
240 * not to request anything bogus.)
242 if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
243 channel_permit_all_opens();
248 #if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD)
249 if ((lc = login_getclass(pw->pw_class)) == NULL) {
250 error("unable to get login class");
256 * We stay in this loop until the client requests to execute a shell
262 /* Get a packet from the client. */
263 type = packet_read(&plen);
265 /* Process the packet. */
267 case SSH_CMSG_REQUEST_COMPRESSION:
268 packet_integrity_check(plen, 4, type);
269 compression_level = packet_get_int();
270 if (compression_level < 1 || compression_level > 9) {
271 packet_send_debug("Received illegal compression level %d.",
275 /* Enable compression after we have responded with SUCCESS. */
276 enable_compression_after_reply = 1;
280 case SSH_CMSG_REQUEST_PTY:
282 debug("Allocating a pty not permitted for this authentication.");
286 packet_disconnect("Protocol error: you already have a pty.");
288 debug("Allocating pty.");
290 /* Allocate a pty and open it. */
291 if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty,
293 error("Failed to allocate pty.");
296 fatal_add_cleanup(pty_cleanup_proc, (void *)s);
297 pty_setowner(pw, s->tty);
299 /* Get TERM from the packet. Note that the value may be of arbitrary length. */
300 s->term = packet_get_string(&dlen);
301 packet_integrity_check(dlen, strlen(s->term), type);
302 /* packet_integrity_check(plen, 4 + dlen + 4*4 + n_bytes, type); */
303 /* Remaining bytes */
304 n_bytes = plen - (4 + dlen + 4 * 4);
306 if (strcmp(s->term, "") == 0) {
310 /* Get window size from the packet. */
311 s->row = packet_get_int();
312 s->col = packet_get_int();
313 s->xpixel = packet_get_int();
314 s->ypixel = packet_get_int();
315 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
317 /* Get tty modes from the packet. */
318 tty_parse_modes(s->ttyfd, &n_bytes);
319 packet_integrity_check(plen, 4 + dlen + 4 * 4 + n_bytes, type);
321 session_proctitle(s);
323 /* Indicate that we now have a pty. */
328 case SSH_CMSG_X11_REQUEST_FORWARDING:
329 if (!options.x11_forwarding) {
330 packet_send_debug("X11 forwarding disabled in server configuration file.");
333 if (!options.xauth_location) {
334 packet_send_debug("No xauth program; cannot forward with spoofing.");
337 if (no_x11_forwarding_flag) {
338 packet_send_debug("X11 forwarding not permitted for this authentication.");
341 debug("Received request for X11 forwarding with auth spoofing.");
342 if (s->display != NULL)
343 packet_disconnect("Protocol error: X11 display already set.");
345 s->auth_proto = packet_get_string(&proto_len);
346 s->auth_data = packet_get_string(&data_len);
347 packet_integrity_check(plen, 4 + proto_len + 4 + data_len + 4, type);
349 if (packet_get_protocol_flags() & SSH_PROTOFLAG_SCREEN_NUMBER)
350 s->screen = packet_get_int();
353 s->display = x11_create_display_inet(s->screen, options.x11_display_offset);
355 if (s->display == NULL)
358 /* Setup to always have a local .Xauthority. */
359 xauthfile = xmalloc(MAXPATHLEN);
360 strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
361 temporarily_use_uid(pw->pw_uid);
362 if (mkdtemp(xauthfile) == NULL) {
364 error("private X11 dir: mkdtemp %s failed: %s",
365 xauthfile, strerror(errno));
368 /* XXXX remove listening channels */
371 strlcat(xauthfile, "/cookies", MAXPATHLEN);
372 fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
376 fatal_add_cleanup(xauthfile_cleanup_proc, NULL);
380 case SSH_CMSG_AGENT_REQUEST_FORWARDING:
381 if (no_agent_forwarding_flag || compat13) {
382 debug("Authentication agent forwarding not permitted for this authentication.");
385 debug("Received authentication agent forwarding request.");
386 success = auth_input_request_forwarding(pw);
389 case SSH_CMSG_PORT_FORWARD_REQUEST:
390 if (no_port_forwarding_flag) {
391 debug("Port forwarding not permitted for this authentication.");
394 if (!options.allow_tcp_forwarding) {
395 debug("Port forwarding not permitted.");
398 debug("Received TCP/IP port forwarding request.");
399 channel_input_port_forward_request(pw->pw_uid == 0, options.gateway_ports);
403 case SSH_CMSG_MAX_PACKET_SIZE:
404 if (packet_set_maxsize(packet_get_int()) > 0)
408 case SSH_CMSG_EXEC_SHELL:
409 case SSH_CMSG_EXEC_CMD:
410 /* Set interactive/non-interactive mode. */
411 packet_set_interactive(have_pty || s->display != NULL,
414 if (type == SSH_CMSG_EXEC_CMD) {
415 command = packet_get_string(&dlen);
416 debug("Exec command '%.500s'", command);
417 packet_integrity_check(plen, 4 + dlen, type);
420 packet_integrity_check(plen, 0, type);
422 if (forced_command != NULL) {
423 original_command = command;
424 command = forced_command;
425 debug("Forced command '%.500s'", forced_command);
428 do_exec_pty(s, command, pw);
430 do_exec_no_pty(s, command, pw);
434 /* Cleanup user's local Xauthority file. */
436 xauthfile_cleanup_proc(NULL);
441 * Any unknown messages in this phase are ignored,
442 * and a failure message is returned.
444 log("Unknown packet type received after authentication: %d", type);
446 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
450 /* Enable compression now that we have replied if appropriate. */
451 if (enable_compression_after_reply) {
452 enable_compression_after_reply = 0;
453 packet_start_compression(compression_level);
459 * This is called to fork and execute a command when we have no tty. This
460 * will call do_child from the child, and server_loop from the parent after
461 * setting up file descriptors and such.
464 do_exec_no_pty(Session *s, const char *command, struct passwd * pw)
469 int pin[2], pout[2], perr[2];
470 /* Allocate pipes for communicating with the program. */
471 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
472 packet_disconnect("Could not create pipes: %.100s",
474 #else /* USE_PIPES */
475 int inout[2], err[2];
476 /* Uses socket pairs to communicate with the program. */
477 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
478 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
479 packet_disconnect("Could not create socket pairs: %.100s",
481 #endif /* USE_PIPES */
483 fatal("do_exec_no_pty: no session");
485 signal(SIGPIPE, SIG_DFL);
487 session_proctitle(s);
493 /* Fork the child. */
494 if ((pid = fork()) == 0) {
495 /* Child. Reinitialize the log since the pid has changed. */
496 log_init(__progname, options.log_level, options.log_facility, log_stderr);
499 * Create a new session and process group since the 4.4BSD
500 * setlogin() affects the entire process group.
503 error("setsid failed: %.100s", strerror(errno));
507 * Redirect stdin. We close the parent side of the socket
508 * pair, and make the child side the standard input.
511 if (dup2(pin[0], 0) < 0)
512 perror("dup2 stdin");
515 /* Redirect stdout. */
517 if (dup2(pout[1], 1) < 0)
518 perror("dup2 stdout");
521 /* Redirect stderr. */
523 if (dup2(perr[1], 2) < 0)
524 perror("dup2 stderr");
526 #else /* USE_PIPES */
528 * Redirect stdin, stdout, and stderr. Stdin and stdout will
529 * use the same socket, as some programs (particularly rdist)
530 * seem to depend on it.
534 if (dup2(inout[0], 0) < 0) /* stdin */
535 perror("dup2 stdin");
536 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
537 perror("dup2 stdout");
538 if (dup2(err[0], 2) < 0) /* stderr */
539 perror("dup2 stderr");
540 #endif /* USE_PIPES */
542 /* Do processing for the child (exec command etc). */
543 do_child(command, pw, NULL, s->display, s->auth_proto, s->auth_data, NULL);
548 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
551 packet_disconnect("fork failed: %.100s", strerror(errno));
554 /* We are the parent. Close the child sides of the pipes. */
560 session_set_fds(s, pin[1], pout[0], s->extended ? perr[0] : -1);
562 /* Enter the interactive session. */
563 server_loop(pid, pin[1], pout[0], perr[0]);
564 /* server_loop has closed pin[1], pout[1], and perr[1]. */
566 #else /* USE_PIPES */
567 /* We are the parent. Close the child sides of the socket pairs. */
572 * Enter the interactive session. Note: server_loop must be able to
573 * handle the case that fdin and fdout are the same.
576 session_set_fds(s, inout[1], inout[1], s->extended ? err[1] : -1);
578 server_loop(pid, inout[1], inout[1], err[1]);
579 /* server_loop has closed inout[1] and err[1]. */
581 #endif /* USE_PIPES */
585 * This is called to fork and execute a command when we have a tty. This
586 * will call do_child from the child, and server_loop from the parent after
587 * setting up file descriptors, controlling tty, updating wtmp, utmp,
588 * lastlog, and other such operations.
591 do_exec_pty(Session *s, const char *command, struct passwd * pw)
593 int fdout, ptyfd, ttyfd, ptymaster;
597 fatal("do_exec_pty: no session");
602 do_pam_session(pw->pw_name, s->tty);
606 /* Fork the child. */
607 if ((pid = fork()) == 0) {
608 /* Child. Reinitialize the log because the pid has changed. */
609 log_init(__progname, options.log_level, options.log_facility, log_stderr);
611 /* Close the master side of the pseudo tty. */
614 /* Make the pseudo tty our controlling tty. */
615 pty_make_controlling_tty(&ttyfd, s->tty);
617 /* Redirect stdin from the pseudo tty. */
618 if (dup2(ttyfd, fileno(stdin)) < 0)
619 error("dup2 stdin failed: %.100s", strerror(errno));
621 /* Redirect stdout to the pseudo tty. */
622 if (dup2(ttyfd, fileno(stdout)) < 0)
623 error("dup2 stdin failed: %.100s", strerror(errno));
625 /* Redirect stderr to the pseudo tty. */
626 if (dup2(ttyfd, fileno(stderr)) < 0)
627 error("dup2 stdin failed: %.100s", strerror(errno));
629 /* Close the extra descriptor for the pseudo tty. */
632 /* record login, etc. similar to login(1) */
633 if (!(options.use_login && command == NULL))
634 do_login(s, command);
636 /* Do common processing for the child, such as execing the command. */
637 do_child(command, pw, s->term, s->display, s->auth_proto,
638 s->auth_data, s->tty);
643 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
646 packet_disconnect("fork failed: %.100s", strerror(errno));
649 /* Parent. Close the slave side of the pseudo tty. */
653 * Create another descriptor of the pty master side for use as the
654 * standard input. We could use the original descriptor, but this
655 * simplifies code in server_loop. The descriptor is bidirectional.
659 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
661 /* we keep a reference to the pty master */
662 ptymaster = dup(ptyfd);
664 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
665 s->ptymaster = ptymaster;
667 /* Enter interactive session. */
669 session_set_fds(s, ptyfd, fdout, -1);
671 server_loop(pid, ptyfd, fdout, -1);
672 /* server_loop _has_ closed ptyfd and fdout. */
673 session_pty_cleanup(s);
678 get_remote_name_or_ip(void)
680 static const char *remote = "";
682 remote = get_canonical_hostname();
683 if (utmp_len == 0 || strlen(remote) > utmp_len)
684 remote = get_remote_ipaddr();
688 /* administrative, login(1)-like work */
690 do_login(Session *s, const char *command)
695 char hostname[MAXHOSTNAMELEN];
697 struct sockaddr_storage from;
699 time_t last_login_time;
700 struct passwd * pw = s->pw;
701 pid_t pid = getpid();
704 * Get IP address of client. If the connection is not a socket, let
705 * the address be 0.0.0.0.
707 memset(&from, 0, sizeof(from));
708 if (packet_connection_is_on_socket()) {
709 fromlen = sizeof(from);
710 if (getpeername(packet_get_connection_in(),
711 (struct sockaddr *) & from, &fromlen) < 0) {
712 debug("getpeername: %.100s", strerror(errno));
717 /* Get the time and hostname when the user last logged in. */
719 last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name,
720 hostname, sizeof(hostname));
722 /* Record that there was a login on that tty from the remote host. */
723 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
724 get_remote_name_or_ip(), (struct sockaddr *)&from);
728 * If password change is needed, do it now.
729 * This needs to occur before the ~/.hushlogin check.
731 if (pam_password_change_required()) {
732 print_pam_messages();
737 /* Done if .hushlogin exists or a command given. */
740 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
741 #ifdef HAVE_LOGIN_CAP
742 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
744 if (stat(buf, &st) >= 0)
749 if (!pam_password_change_required())
750 print_pam_messages();
752 #ifdef WITH_AIXAUTHENTICATE
753 if (aixloginmsg && *aixloginmsg)
754 printf("%s\n", aixloginmsg);
755 #endif /* WITH_AIXAUTHENTICATE */
757 if (last_login_time != 0) {
758 time_string = ctime(&last_login_time);
759 if (strchr(time_string, '\n'))
760 *strchr(time_string, '\n') = 0;
761 if (strcmp(hostname, "") == 0)
762 printf("Last login: %s\r\n", time_string);
764 printf("Last login: %s from %s\r\n", time_string, hostname);
766 if (options.print_motd) {
767 #ifdef HAVE_LOGIN_CAP
768 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
771 f = fopen("/etc/motd", "r");
774 while (fgets(buf, sizeof(buf), f))
782 * Sets the value of the given variable in the environment. If the variable
783 * already exists, its value is overriden.
786 child_set_env(char ***envp, unsigned int *envsizep, const char *name,
789 unsigned int i, namelen;
793 * Find the slot where the value should be stored. If the variable
794 * already exists, we reuse the slot; otherwise we append a new slot
795 * at the end of the array, expanding if necessary.
798 namelen = strlen(name);
799 for (i = 0; env[i]; i++)
800 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
803 /* Reuse the slot. */
806 /* New variable. Expand if necessary. */
807 if (i >= (*envsizep) - 1) {
809 env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *));
811 /* Need to set the NULL pointer at end of array beyond the new slot. */
815 /* Allocate space and format the variable in the appropriate slot. */
816 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
817 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
821 * Reads environment variables from the given file and adds/overrides them
822 * into the environment. If the file does not exist, this does nothing.
823 * Otherwise, it must consist of empty lines, comments (line starts with '#')
824 * and assignments of the form name=value. No other forms are allowed.
827 read_environment_file(char ***env, unsigned int *envsize,
828 const char *filename)
834 f = fopen(filename, "r");
838 while (fgets(buf, sizeof(buf), f)) {
839 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
841 if (!*cp || *cp == '#' || *cp == '\n')
843 if (strchr(cp, '\n'))
844 *strchr(cp, '\n') = '\0';
845 value = strchr(cp, '=');
847 fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf);
851 * Replace the equals sign by nul, and advance value to
856 child_set_env(env, envsize, cp, value);
863 * Sets any environment variables which have been specified by PAM
865 void do_pam_environment(char ***env, int *envsize)
867 char *equals, var_name[512], var_val[512];
871 if ((pam_env = fetch_pam_environment()) == NULL)
874 for(i = 0; pam_env[i] != NULL; i++) {
875 if ((equals = strstr(pam_env[i], "=")) == NULL)
878 if (strlen(pam_env[i]) < (sizeof(var_name) - 1)) {
879 memset(var_name, '\0', sizeof(var_name));
880 memset(var_val, '\0', sizeof(var_val));
882 strncpy(var_name, pam_env[i], equals - pam_env[i]);
883 strcpy(var_val, equals + 1);
885 debug3("PAM environment: %s=%s", var_name, var_val);
887 child_set_env(env, envsize, var_name, var_val);
895 void copy_environment(char ***env, int *envsize)
897 char *equals, var_name[512], var_val[512];
900 for(i = 0; environ[i] != NULL; i++) {
901 if ((equals = strstr(environ[i], "=")) == NULL)
904 if (strlen(environ[i]) < (sizeof(var_name) - 1)) {
905 memset(var_name, '\0', sizeof(var_name));
906 memset(var_val, '\0', sizeof(var_val));
908 strncpy(var_name, environ[i], equals - environ[i]);
909 strcpy(var_val, equals + 1);
911 debug3("Copy environment: %s=%s", var_name, var_val);
913 child_set_env(env, envsize, var_name, var_val);
919 #if defined(HAVE_GETUSERATTR)
921 * AIX-specific login initialisation
923 void set_limit(char *user, char *soft, char *hard, int resource, int mult)
928 getrlimit(resource, &rlim);
931 if (getuserattr(user, soft, &slim, SEC_INT) != -1) {
933 rlim.rlim_cur = RLIM_INFINITY;
934 } else if (slim != 0) {
935 /* See the wackiness below */
936 if (rlim.rlim_cur == slim * mult)
939 rlim.rlim_cur = slim * mult;
944 if (getuserattr(user, hard, &hlim, SEC_INT) != -1) {
946 rlim.rlim_max = RLIM_INFINITY;
947 } else if (hlim != 0) {
948 rlim.rlim_max = hlim * mult;
953 * XXX For cpu and fsize the soft limit is set to the hard limit
954 * if the hard limit is left at its default value and the soft limit
955 * is changed from its default value, either by requesting it
956 * (slim == 0) or by setting it to the current default. At least
957 * that's how rlogind does it. If you're confused you're not alone.
958 * Bug or feature? AIX 4.3.1.2
960 if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu"))
961 && hlim == 0 && slim != 0)
962 rlim.rlim_max = rlim.rlim_cur;
963 /* A specified hard limit limits the soft limit */
964 else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max)
965 rlim.rlim_cur = rlim.rlim_max;
966 /* A soft limit can increase a hard limit */
967 else if (rlim.rlim_cur > rlim.rlim_max)
968 rlim.rlim_max = rlim.rlim_cur;
970 if (setrlimit(resource, &rlim) != 0)
971 error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno));
974 void set_limits_from_userattr(char *user)
979 set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512);
980 set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1);
981 set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512);
982 set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512);
983 set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512);
984 set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512);
985 #if defined(S_UNOFILE)
986 set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1);
989 if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) {
990 /* Convert decimal to octal */
991 (void) snprintf(buf, sizeof(buf), "%d", mask);
992 if (sscanf(buf, "%o", &mask) == 1)
996 #endif /* defined(HAVE_GETUSERATTR) */
999 * Performs common processing for the child, such as setting up the
1000 * environment, closing extra file descriptors, setting the user and group
1001 * ids, and executing the command or shell.
1004 do_child(const char *command, struct passwd * pw, const char *term,
1005 const char *display, const char *auth_proto,
1006 const char *auth_data, const char *ttyname)
1008 const char *shell, *hostname = NULL, *cp = NULL;
1012 unsigned int envsize, i;
1014 extern char **environ;
1017 #ifdef WITH_IRIX_PROJECT
1019 #endif /* WITH_IRIX_PROJECT */
1020 #ifdef WITH_IRIX_JOBS
1023 #ifdef WITH_IRIX_ARRAY
1025 #endif /* WITH_IRIX_ARRAY */
1026 #endif /* WITH_IRIX_JOBS */
1029 /* login(1) is only called if we execute the login shell */
1030 if (options.use_login && command != NULL)
1031 options.use_login = 0;
1033 #ifndef USE_PAM /* pam_nologin handles this */
1034 if (!options.use_login) {
1035 # ifdef HAVE_LOGIN_CAP
1036 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
1037 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
1038 _PATH_NOLOGIN), "r");
1039 # else /* HAVE_LOGIN_CAP */
1041 f = fopen(_PATH_NOLOGIN, "r");
1042 # endif /* HAVE_LOGIN_CAP */
1044 /* /etc/nologin exists. Print its contents and exit. */
1045 while (fgets(buf, sizeof(buf), f))
1051 #endif /* USE_PAM */
1053 /* Set login name, uid, gid, and groups. */
1054 /* Login(1) does this as well, and it needs uid 0 for the "-h"
1055 switch, so we let login(1) to this for us. */
1056 if (!options.use_login) {
1058 extern char **saved_argv;
1059 extern int saved_argc;
1060 char *host = get_canonical_hostname ();
1062 if (sia_become_user(NULL, saved_argc, saved_argv, host,
1063 pw->pw_name, ttyname, 0, NULL, NULL, SIA_BEU_SETLUID) !=
1065 perror("sia_become_user");
1068 if (setreuid(geteuid(), geteuid()) < 0) {
1072 #else /* HAVE_OSF_SIA */
1076 if (getuid() == 0 || geteuid() == 0) {
1078 # ifdef HAVE_GETUSERATTR
1079 set_limits_from_userattr(pw->pw_name);
1080 # endif /* HAVE_GETUSERATTR */
1081 # ifdef HAVE_LOGIN_CAP
1082 if (setusercontext(lc, pw, pw->pw_uid,
1083 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1084 perror("unable to set user context");
1087 # else /* HAVE_LOGIN_CAP */
1088 if (setlogin(pw->pw_name) < 0)
1089 error("setlogin failed: %s", strerror(errno));
1090 if (setgid(pw->pw_gid) < 0) {
1094 /* Initialize the group list. */
1095 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1096 perror("initgroups");
1100 # ifdef WITH_IRIX_JOBS
1101 jid = jlimit_startjob(pw->pw_name, pw->pw_uid, "interactive");
1103 fatal("Failed to create job container: %.100s",
1106 # endif /* WITH_IRIX_JOBS */
1108 # ifdef WITH_IRIX_ARRAY
1109 /* initialize array session */
1111 if (newarraysess() != 0)
1112 fatal("Failed to set up new array session: %.100s",
1115 # endif /* WITH_IRIX_ARRAY */
1116 # ifdef WITH_IRIX_PROJECT
1117 /* initialize irix project info */
1118 if ((projid = getdfltprojuser(pw->pw_name)) == -1) {
1119 debug("Failed to get project id, using projid 0");
1122 if (setprid(projid))
1123 fatal("Failed to initialize project %d for %s: %.100s",
1124 (int)projid, pw->pw_name, strerror(errno));
1125 # endif /* WITH_IRIX_PROJECT */
1126 /* Permanently switch to the desired uid. */
1127 permanently_set_uid(pw->pw_uid);
1128 # endif /* HAVE_LOGIN_CAP */
1130 #endif /* HAVE_OSF_SIA */
1135 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1136 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1139 * Get the shell from the password data. An empty shell field is
1140 * legal, and means /bin/sh.
1142 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1143 #ifdef HAVE_LOGIN_CAP
1144 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1148 /* Try to get AFS tokens for the local cell. */
1152 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1153 krb_afslog(cell, 0);
1159 /* Initialize the environment. */
1161 env = xmalloc(envsize * sizeof(char *));
1166 * The Windows environment contains some setting which are
1167 * important for a running system. They must not be dropped.
1169 copy_environment(&env, &envsize);
1172 if (!options.use_login) {
1173 /* Set basic environment. */
1174 child_set_env(&env, &envsize, "USER", pw->pw_name);
1175 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
1176 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
1177 #ifdef HAVE_LOGIN_CAP
1178 (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH);
1179 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
1180 #else /* HAVE_LOGIN_CAP */
1181 # ifndef HAVE_CYGWIN
1183 * There's no standard path on Windows. The path contains
1184 * important components pointing to the system directories,
1185 * needed for loading shared libraries. So the path better
1186 * remains intact here.
1188 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
1189 # endif /* HAVE_CYGWIN */
1190 #endif /* HAVE_LOGIN_CAP */
1192 snprintf(buf, sizeof buf, "%.200s/%.50s",
1193 _PATH_MAILDIR, pw->pw_name);
1194 child_set_env(&env, &envsize, "MAIL", buf);
1196 /* Normal systems set SHELL by default. */
1197 child_set_env(&env, &envsize, "SHELL", shell);
1200 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1202 /* Set custom environment options from RSA authentication. */
1203 while (custom_environment) {
1204 struct envstring *ce = custom_environment;
1207 for (i = 0; s[i] != '=' && s[i]; i++);
1210 child_set_env(&env, &envsize, s, s + i + 1);
1212 custom_environment = ce->next;
1217 snprintf(buf, sizeof buf, "%.50s %d %d",
1218 get_remote_ipaddr(), get_remote_port(), get_local_port());
1219 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1222 child_set_env(&env, &envsize, "SSH_TTY", ttyname);
1224 child_set_env(&env, &envsize, "TERM", term);
1226 child_set_env(&env, &envsize, "DISPLAY", display);
1227 if (original_command)
1228 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
1232 if ((cp = getenv("AUTHSTATE")) != NULL)
1233 child_set_env(&env, &envsize, "AUTHSTATE", cp);
1234 if ((cp = getenv("KRB5CCNAME")) != NULL)
1235 child_set_env(&env, &envsize, "KRB5CCNAME", cp);
1236 read_environment_file(&env, &envsize, "/etc/environment");
1241 extern char *ticket;
1244 child_set_env(&env, &envsize, "KRBTKFILE", ticket);
1249 /* Pull in any environment variables that may have been set by PAM. */
1250 do_pam_environment(&env, &envsize);
1251 #endif /* USE_PAM */
1254 child_set_env(&env, &envsize, "XAUTHORITY", xauthfile);
1255 if (auth_get_socket_name() != NULL)
1256 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1257 auth_get_socket_name());
1259 /* read $HOME/.ssh/environment. */
1260 if (!options.use_login) {
1261 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
1263 read_environment_file(&env, &envsize, buf);
1266 /* dump the environment */
1267 fprintf(stderr, "Environment:\n");
1268 for (i = 0; env[i]; i++)
1269 fprintf(stderr, " %.200s\n", env[i]);
1271 /* we have to stash the hostname before we close our socket. */
1272 if (options.use_login)
1273 hostname = get_remote_name_or_ip();
1275 * Close the connection descriptors; note that this is the child, and
1276 * the server will still have the socket open, and it is important
1277 * that we do not shutdown it. Note that the descriptors cannot be
1278 * closed before building the environment, as we call
1279 * get_remote_ipaddr there.
1281 if (packet_get_connection_in() == packet_get_connection_out())
1282 close(packet_get_connection_in());
1284 close(packet_get_connection_in());
1285 close(packet_get_connection_out());
1288 * Close all descriptors related to channels. They will still remain
1289 * open in the parent.
1291 /* XXX better use close-on-exec? -markus */
1292 channel_close_all();
1295 * Close any extra file descriptors. Note that there may still be
1296 * descriptors left by system functions. They will be closed later.
1301 * Close any extra open file descriptors so that we don\'t have them
1302 * hanging around in clients. Note that we want to do this after
1303 * initgroups, because at least on Solaris 2.3 it leaves file
1306 for (i = 3; i < 64; i++)
1309 /* Change current directory to the user\'s home directory. */
1310 if (chdir(pw->pw_dir) < 0) {
1311 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1312 pw->pw_dir, strerror(errno));
1313 #ifdef HAVE_LOGIN_CAP
1314 if (login_getcapbool(lc, "requirehome", 0))
1320 * Must take new environment into use so that .ssh/rc, /etc/sshrc and
1321 * xauth are run in the proper environment.
1326 * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first
1329 if (!options.use_login) {
1330 if (stat(SSH_USER_RC, &st) >= 0) {
1332 fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_USER_RC);
1334 f = popen(_PATH_BSHELL " " SSH_USER_RC, "w");
1336 if (auth_proto != NULL && auth_data != NULL)
1337 fprintf(f, "%s %s\n", auth_proto, auth_data);
1340 fprintf(stderr, "Could not run %s\n", SSH_USER_RC);
1341 } else if (stat(SSH_SYSTEM_RC, &st) >= 0) {
1343 fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_SYSTEM_RC);
1345 f = popen(_PATH_BSHELL " " SSH_SYSTEM_RC, "w");
1347 if (auth_proto != NULL && auth_data != NULL)
1348 fprintf(f, "%s %s\n", auth_proto, auth_data);
1351 fprintf(stderr, "Could not run %s\n", SSH_SYSTEM_RC);
1352 } else if (options.xauth_location != NULL) {
1353 /* Add authority data to .Xauthority if appropriate. */
1354 if (auth_proto != NULL && auth_data != NULL) {
1355 char *screen = strchr(display, ':');
1358 "Running %.100s add %.100s %.100s %.100s\n",
1359 options.xauth_location, display,
1360 auth_proto, auth_data);
1361 #ifndef HAVE_CYGWIN /* Unix sockets are not supported */
1364 "Adding %.*s/unix%s %s %s\n",
1365 (int)(screen-display), display,
1366 screen, auth_proto, auth_data);
1369 snprintf(cmd, sizeof cmd, "%s -q -",
1370 options.xauth_location);
1371 f = popen(cmd, "w");
1373 fprintf(f, "add %s %s %s\n", display,
1374 auth_proto, auth_data);
1375 #ifndef HAVE_CYGWIN /* Unix sockets are not supported */
1377 fprintf(f, "add %.*s/unix%s %s %s\n",
1378 (int)(screen-display), display,
1379 screen, auth_proto, auth_data);
1383 fprintf(stderr, "Could not run %s\n",
1388 /* Get the last component of the shell name. */
1389 cp = strrchr(shell, '/');
1396 * If we have no command, execute the shell. In this case, the shell
1397 * name to be passed in argv[0] is preceded by '-' to indicate that
1398 * this is a login shell.
1401 if (!options.use_login) {
1405 * Check for mail if we have a tty and it was enabled
1406 * in server options.
1408 if (ttyname && options.check_mail) {
1410 struct stat mailstat;
1411 mailbox = getenv("MAIL");
1412 if (mailbox != NULL) {
1413 if (stat(mailbox, &mailstat) != 0 ||
1414 mailstat.st_size == 0)
1415 printf("No mail.\n");
1416 else if (mailstat.st_mtime < mailstat.st_atime)
1417 printf("You have mail.\n");
1419 printf("You have new mail.\n");
1422 /* Start the shell. Set initial character to '-'. */
1424 strncpy(buf + 1, cp, sizeof(buf) - 1);
1425 buf[sizeof(buf) - 1] = 0;
1427 /* Execute the shell. */
1430 execve(shell, argv, env);
1432 /* Executing the shell failed. */
1437 /* Launch login(1). */
1439 execl(LOGIN_PROGRAM, "login", "-h", hostname,
1440 "-p", "-f", "--", pw->pw_name, NULL);
1442 /* Login couldn't be executed, die. */
1449 * Execute the command using the user's shell. This uses the -c
1450 * option to execute the command.
1452 argv[0] = (char *) cp;
1454 argv[2] = (char *) command;
1456 execve(shell, argv, env);
1465 static int did_init = 0;
1467 debug("session_new: init");
1468 for(i = 0; i < MAX_SESSIONS; i++) {
1469 sessions[i].used = 0;
1470 sessions[i].self = i;
1474 for(i = 0; i < MAX_SESSIONS; i++) {
1475 Session *s = &sessions[i];
1486 s->auth_data = NULL;
1487 s->auth_proto = NULL;
1490 debug("session_new: session %d", i);
1501 for(i = 0; i < MAX_SESSIONS; i++) {
1502 Session *s = &sessions[i];
1503 debug("dump: used %d session %d %p channel %d pid %d",
1513 session_open(int chanid)
1515 Session *s = session_new();
1516 debug("session_open: channel %d", chanid);
1518 error("no more sessions");
1521 s->pw = auth_get_user();
1523 fatal("no user for session %i", s->self);
1524 debug("session_open: session %d: link with channel %d", s->self, chanid);
1530 session_by_channel(int id)
1533 for(i = 0; i < MAX_SESSIONS; i++) {
1534 Session *s = &sessions[i];
1535 if (s->used && s->chanid == id) {
1536 debug("session_by_channel: session %d channel %d", i, id);
1540 debug("session_by_channel: unknown channel %d", id);
1546 session_by_pid(pid_t pid)
1549 debug("session_by_pid: pid %d", pid);
1550 for(i = 0; i < MAX_SESSIONS; i++) {
1551 Session *s = &sessions[i];
1552 if (s->used && s->pid == pid)
1555 error("session_by_pid: unknown pid %d", pid);
1561 session_window_change_req(Session *s)
1563 s->col = packet_get_int();
1564 s->row = packet_get_int();
1565 s->xpixel = packet_get_int();
1566 s->ypixel = packet_get_int();
1568 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1573 session_pty_req(Session *s)
1576 char *term_modes; /* encoded terminal modes */
1582 s->term = packet_get_string(&len);
1583 s->col = packet_get_int();
1584 s->row = packet_get_int();
1585 s->xpixel = packet_get_int();
1586 s->ypixel = packet_get_int();
1587 term_modes = packet_get_string(&len);
1590 if (strcmp(s->term, "") == 0) {
1594 /* Allocate a pty and open it. */
1595 if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) {
1600 error("session_pty_req: session %d alloc failed", s->self);
1604 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1606 * Add a cleanup function to clear the utmp entry and record logout
1607 * time in case we call fatal() (e.g., the connection gets closed).
1609 fatal_add_cleanup(pty_cleanup_proc, (void *)s);
1610 pty_setowner(s->pw, s->tty);
1611 /* Get window size from the packet. */
1612 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1614 session_proctitle(s);
1616 /* XXX parse and set terminal modes */
1622 session_subsystem_req(Session *s)
1626 char *subsys = packet_get_string(&len);
1630 log("subsystem request for %s", subsys);
1632 for (i = 0; i < options.num_subsystems; i++) {
1633 if(strcmp(subsys, options.subsystem_name[i]) == 0) {
1634 debug("subsystem: exec() %s", options.subsystem_command[i]);
1635 do_exec_no_pty(s, options.subsystem_command[i], s->pw);
1641 log("subsystem request for %s failed, subsystem not found", subsys);
1648 session_x11_req(Session *s)
1651 if (no_x11_forwarding_flag) {
1652 debug("X11 forwarding disabled in user configuration file.");
1655 if (!options.x11_forwarding) {
1656 debug("X11 forwarding disabled in server configuration file.");
1659 if (xauthfile != NULL) {
1660 debug("X11 fwd already started.");
1664 debug("Received request for X11 forwarding with auth spoofing.");
1665 if (s->display != NULL)
1666 packet_disconnect("Protocol error: X11 display already set.");
1668 s->single_connection = packet_get_char();
1669 s->auth_proto = packet_get_string(NULL);
1670 s->auth_data = packet_get_string(NULL);
1671 s->screen = packet_get_int();
1674 s->display = x11_create_display_inet(s->screen, options.x11_display_offset);
1675 if (s->display == NULL) {
1676 xfree(s->auth_proto);
1677 xfree(s->auth_data);
1680 xauthfile = xmalloc(MAXPATHLEN);
1681 strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
1682 temporarily_use_uid(s->pw->pw_uid);
1683 if (mkdtemp(xauthfile) == NULL) {
1685 error("private X11 dir: mkdtemp %s failed: %s",
1686 xauthfile, strerror(errno));
1689 xfree(s->auth_proto);
1690 xfree(s->auth_data);
1691 /* XXXX remove listening channels */
1694 strlcat(xauthfile, "/cookies", MAXPATHLEN);
1695 fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
1699 fatal_add_cleanup(xauthfile_cleanup_proc, s);
1704 session_shell_req(Session *s)
1706 /* if forced_command == NULL, the shell is execed */
1707 char *shell = forced_command;
1711 do_exec_no_pty(s, shell, s->pw);
1713 do_exec_pty(s, shell, s->pw);
1718 session_exec_req(Session *s)
1721 char *command = packet_get_string(&len);
1723 if (forced_command) {
1724 original_command = command;
1725 command = forced_command;
1726 debug("Forced command '%.500s'", forced_command);
1730 do_exec_no_pty(s, command, s->pw);
1732 do_exec_pty(s, command, s->pw);
1733 if (forced_command == NULL)
1739 session_auth_agent_req(Session *s)
1741 static int called = 0;
1747 return auth_input_request_forwarding(s->pw);
1752 session_input_channel_req(int id, void *arg)
1761 rtype = packet_get_string(&len);
1762 reply = packet_get_char();
1764 s = session_by_channel(id);
1766 fatal("session_input_channel_req: channel %d: no session", id);
1767 c = channel_lookup(id);
1769 fatal("session_input_channel_req: channel %d: bad channel", id);
1771 debug("session_input_channel_req: session %d channel %d request %s reply %d",
1772 s->self, id, rtype, reply);
1775 * a session is in LARVAL state until a shell
1776 * or programm is executed
1778 if (c->type == SSH_CHANNEL_LARVAL) {
1779 if (strcmp(rtype, "shell") == 0) {
1780 success = session_shell_req(s);
1781 } else if (strcmp(rtype, "exec") == 0) {
1782 success = session_exec_req(s);
1783 } else if (strcmp(rtype, "pty-req") == 0) {
1784 success = session_pty_req(s);
1785 } else if (strcmp(rtype, "x11-req") == 0) {
1786 success = session_x11_req(s);
1787 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1788 success = session_auth_agent_req(s);
1789 } else if (strcmp(rtype, "subsystem") == 0) {
1790 success = session_subsystem_req(s);
1793 if (strcmp(rtype, "window-change") == 0) {
1794 success = session_window_change_req(s);
1798 packet_start(success ?
1799 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1800 packet_put_int(c->remote_id);
1807 session_set_fds(Session *s, int fdin, int fdout, int fderr)
1810 fatal("session_set_fds: called for proto != 2.0");
1812 * now that have a child and a pipe to the child,
1813 * we can activate our channel and register the fd's
1815 if (s->chanid == -1)
1816 fatal("no channel for session %d", s->self);
1817 channel_set_fds(s->chanid,
1819 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1824 session_pty_cleanup(Session *s)
1826 if (s == NULL || s->ttyfd == -1)
1829 debug("session_pty_cleanup: session %i release %s", s->self, s->tty);
1831 /* Cancel the cleanup function. */
1832 fatal_remove_cleanup(pty_cleanup_proc, (void *)s);
1834 /* Record that the user has logged out. */
1835 record_logout(s->pid, s->tty);
1837 /* Release the pseudo-tty. */
1838 pty_release(s->tty);
1841 * Close the server side of the socket pairs. We must do this after
1842 * the pty cleanup, so that another process doesn't get this pty
1843 * while we're still cleaning up.
1845 if (close(s->ptymaster) < 0)
1846 error("close(s->ptymaster): %s", strerror(errno));
1850 session_exit_message(Session *s, int status)
1854 fatal("session_close: no session");
1855 c = channel_lookup(s->chanid);
1857 fatal("session_close: session %d: no channel %d",
1858 s->self, s->chanid);
1859 debug("session_exit_message: session %d channel %d pid %d",
1860 s->self, s->chanid, s->pid);
1862 if (WIFEXITED(status)) {
1863 channel_request_start(s->chanid,
1865 packet_put_int(WEXITSTATUS(status));
1867 } else if (WIFSIGNALED(status)) {
1868 channel_request_start(s->chanid,
1870 packet_put_int(WTERMSIG(status));
1872 packet_put_char(WCOREDUMP(status));
1873 #else /* WCOREDUMP */
1875 #endif /* WCOREDUMP */
1876 packet_put_cstring("");
1877 packet_put_cstring("");
1880 /* Some weird exit cause. Just exit. */
1881 packet_disconnect("wait returned status %04x.", status);
1884 /* disconnect channel */
1885 debug("session_exit_message: release channel %d", s->chanid);
1886 channel_cancel_cleanup(s->chanid);
1888 * emulate a write failure with 'chan_write_failed', nobody will be
1889 * interested in data we write.
1890 * Note that we must not call 'chan_read_failed', since there could
1891 * be some more data waiting in the pipe.
1892 * djm - This is no longer true as we have allowed one pass through
1893 * the select loop before killing the connection
1895 if (c->ostate != CHAN_OUTPUT_CLOSED)
1896 chan_write_failed(c);
1897 if (c->istate != CHAN_INPUT_CLOSED)
1898 chan_read_failed(c);
1903 session_free(Session *s)
1905 debug("session_free: session %d pid %d", s->self, s->pid);
1911 xfree(s->auth_data);
1913 xfree(s->auth_proto);
1918 session_close(Session *s)
1920 session_pty_cleanup(s);
1922 session_proctitle(s);
1926 session_close_by_pid(pid_t pid, int status)
1928 Session *s = session_by_pid(pid);
1930 debug("session_close_by_pid: no session for pid %d", s->pid);
1933 if (s->chanid != -1)
1934 session_exit_message(s, status);
1939 * this is called when a channel dies before
1940 * the session 'child' itself dies
1943 session_close_by_channel(int id, void *arg)
1945 Session *s = session_by_channel(id);
1947 debug("session_close_by_channel: no session for channel %d", id);
1950 /* disconnect channel */
1951 channel_cancel_cleanup(s->chanid);
1954 debug("session_close_by_channel: channel %d kill %d", id, s->pid);
1956 /* close session immediately */
1959 /* notify child, delay session cleanup */
1961 fatal("session_close_by_channel: Unsafe s->pid = %d", s->pid);
1962 if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0)
1963 error("session_close_by_channel: kill %d: %s",
1964 s->pid, strerror(errno));
1969 session_tty_list(void)
1971 static char buf[1024];
1974 for(i = 0; i < MAX_SESSIONS; i++) {
1975 Session *s = &sessions[i];
1976 if (s->used && s->ttyfd != -1) {
1978 strlcat(buf, ",", sizeof buf);
1979 strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
1983 strlcpy(buf, "notty", sizeof buf);
1988 session_proctitle(Session *s)
1991 error("no user for session %d", s->self);
1993 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1997 do_authenticated2(void)
1999 #ifdef HAVE_LOGIN_CAP
2004 * Cancel the alarm we set to limit the time taken for
2008 if (startup_pipe != -1) {
2009 close(startup_pipe);
2012 #if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD)
2013 pw = auth_get_user();
2014 if ((lc = login_getclass(pw->pw_class)) == NULL) {
2015 error("unable to get login class");
2021 xauthfile_cleanup_proc(NULL);