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, 2001 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 1.150 2002/09/16 19:55:33 stevesk Exp $");
51 #include "auth-options.h"
52 #include "pathnames.h"
56 #include "serverloop.h"
59 #include "monitor_wrap.h"
63 #include <sys/cygwin.h>
64 #define is_winnt (GetVersion() < 0x80000000)
69 Session *session_new(void);
70 void session_set_fds(Session *, int, int, int);
71 void session_pty_cleanup(void *);
72 void session_proctitle(Session *);
73 int session_setup_x11fwd(Session *);
74 void do_exec_pty(Session *, const char *);
75 void do_exec_no_pty(Session *, const char *);
76 void do_exec(Session *, const char *);
77 void do_login(Session *, const char *);
78 #ifdef LOGIN_NEEDS_UTMPX
79 static void do_pre_login(Session *s);
81 void do_child(Session *, const char *);
83 int check_quietlogin(Session *, const char *);
85 static void do_authenticated1(Authctxt *);
86 static void do_authenticated2(Authctxt *);
88 static int session_pty_req(Session *);
91 extern ServerOptions options;
92 extern char *__progname;
93 extern int log_stderr;
94 extern int debug_flag;
95 extern u_int utmp_len;
96 extern int startup_pipe;
97 extern void destroy_sensitive_data(void);
99 /* original command from peer. */
100 const char *original_command = NULL;
103 #define MAX_SESSIONS 10
104 Session sessions[MAX_SESSIONS];
106 #ifdef WITH_AIXAUTHENTICATE
108 #endif /* WITH_AIXAUTHENTICATE */
110 #ifdef HAVE_LOGIN_CAP
114 /* Name and directory of socket for authentication agent forwarding. */
115 static char *auth_sock_name = NULL;
116 static char *auth_sock_dir = NULL;
118 /* removes the agent forwarding socket */
121 auth_sock_cleanup_proc(void *_pw)
123 struct passwd *pw = _pw;
125 if (auth_sock_name != NULL) {
126 temporarily_use_uid(pw);
127 unlink(auth_sock_name);
128 rmdir(auth_sock_dir);
129 auth_sock_name = NULL;
135 auth_input_request_forwarding(struct passwd * pw)
139 struct sockaddr_un sunaddr;
141 if (auth_sock_name != NULL) {
142 error("authentication forwarding requested twice.");
146 /* Temporarily drop privileged uid for mkdir/bind. */
147 temporarily_use_uid(pw);
149 /* Allocate a buffer for the socket name, and format the name. */
150 auth_sock_name = xmalloc(MAXPATHLEN);
151 auth_sock_dir = xmalloc(MAXPATHLEN);
152 strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
154 /* Create private directory for socket */
155 if (mkdtemp(auth_sock_dir) == NULL) {
156 packet_send_debug("Agent forwarding disabled: "
157 "mkdtemp() failed: %.100s", strerror(errno));
159 xfree(auth_sock_name);
160 xfree(auth_sock_dir);
161 auth_sock_name = NULL;
162 auth_sock_dir = NULL;
165 snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld",
166 auth_sock_dir, (long) getpid());
168 /* delete agent socket on fatal() */
169 fatal_add_cleanup(auth_sock_cleanup_proc, pw);
171 /* Create the socket. */
172 sock = socket(AF_UNIX, SOCK_STREAM, 0);
174 packet_disconnect("socket: %.100s", strerror(errno));
176 /* Bind it to the name. */
177 memset(&sunaddr, 0, sizeof(sunaddr));
178 sunaddr.sun_family = AF_UNIX;
179 strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path));
181 if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
182 packet_disconnect("bind: %.100s", strerror(errno));
184 /* Restore the privileged uid. */
187 /* Start listening on the socket. */
188 if (listen(sock, 5) < 0)
189 packet_disconnect("listen: %.100s", strerror(errno));
191 /* Allocate a channel for the authentication agent socket. */
192 nc = channel_new("auth socket",
193 SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
194 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
195 0, xstrdup("auth socket"), 1);
196 strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
202 do_authenticated(Authctxt *authctxt)
205 * Cancel the alarm we set to limit the time taken for
209 if (startup_pipe != -1) {
214 /* setup the channel layer */
215 if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
216 channel_permit_all_opens();
219 do_authenticated2(authctxt);
221 do_authenticated1(authctxt);
223 /* remove agent socket */
224 if (auth_sock_name != NULL)
225 auth_sock_cleanup_proc(authctxt->pw);
227 if (options.kerberos_ticket_cleanup)
228 krb4_cleanup_proc(authctxt);
231 if (options.kerberos_ticket_cleanup)
232 krb5_cleanup_proc(authctxt);
237 * Prepares for an interactive session. This is called after the user has
238 * been successfully authenticated. During this message exchange, pseudo
239 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
240 * are requested, etc.
243 do_authenticated1(Authctxt *authctxt)
247 int success, type, screen_flag;
248 int enable_compression_after_reply = 0;
249 u_int proto_len, data_len, dlen, compression_level = 0;
252 s->authctxt = authctxt;
253 s->pw = authctxt->pw;
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();
265 /* Process the packet. */
267 case SSH_CMSG_REQUEST_COMPRESSION:
268 compression_level = packet_get_int();
270 if (compression_level < 1 || compression_level > 9) {
271 packet_send_debug("Received illegal compression level %d.",
275 if (!options.compression) {
276 debug2("compression disabled");
279 /* Enable compression after we have responded with SUCCESS. */
280 enable_compression_after_reply = 1;
284 case SSH_CMSG_REQUEST_PTY:
285 success = session_pty_req(s);
288 case SSH_CMSG_X11_REQUEST_FORWARDING:
289 s->auth_proto = packet_get_string(&proto_len);
290 s->auth_data = packet_get_string(&data_len);
292 screen_flag = packet_get_protocol_flags() &
293 SSH_PROTOFLAG_SCREEN_NUMBER;
294 debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
296 if (packet_remaining() == 4) {
298 debug2("Buggy client: "
299 "X11 screen flag missing");
300 s->screen = packet_get_int();
305 success = session_setup_x11fwd(s);
307 xfree(s->auth_proto);
309 s->auth_proto = NULL;
314 case SSH_CMSG_AGENT_REQUEST_FORWARDING:
315 if (no_agent_forwarding_flag || compat13) {
316 debug("Authentication agent forwarding not permitted for this authentication.");
319 debug("Received authentication agent forwarding request.");
320 success = auth_input_request_forwarding(s->pw);
323 case SSH_CMSG_PORT_FORWARD_REQUEST:
324 if (no_port_forwarding_flag) {
325 debug("Port forwarding not permitted for this authentication.");
328 if (!options.allow_tcp_forwarding) {
329 debug("Port forwarding not permitted.");
332 debug("Received TCP/IP port forwarding request.");
333 channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
337 case SSH_CMSG_MAX_PACKET_SIZE:
338 if (packet_set_maxsize(packet_get_int()) > 0)
342 #if defined(AFS) || defined(KRB5)
343 case SSH_CMSG_HAVE_KERBEROS_TGT:
344 if (!options.kerberos_tgt_passing) {
345 verbose("Kerberos TGT passing disabled.");
347 char *kdata = packet_get_string(&dlen);
350 /* XXX - 0x41, see creds_to_radix version */
351 if (kdata[0] != 0x41) {
357 if (auth_krb5_tgt(s->authctxt, &tgt))
360 verbose("Kerberos v5 TGT refused for %.100s", s->authctxt->user);
364 if (auth_krb4_tgt(s->authctxt, kdata))
367 verbose("Kerberos v4 TGT refused for %.100s", s->authctxt->user);
373 #endif /* AFS || KRB5 */
376 case SSH_CMSG_HAVE_AFS_TOKEN:
377 if (!options.afs_token_passing || !k_hasafs()) {
378 verbose("AFS token passing disabled.");
380 /* Accept AFS token. */
381 char *token = packet_get_string(&dlen);
384 if (auth_afs_token(s->authctxt, token))
387 verbose("AFS token refused for %.100s",
394 case SSH_CMSG_EXEC_SHELL:
395 case SSH_CMSG_EXEC_CMD:
396 if (type == SSH_CMSG_EXEC_CMD) {
397 command = packet_get_string(&dlen);
398 debug("Exec command '%.500s'", command);
410 * Any unknown messages in this phase are ignored,
411 * and a failure message is returned.
413 log("Unknown packet type received after authentication: %d", type);
415 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
419 /* Enable compression now that we have replied if appropriate. */
420 if (enable_compression_after_reply) {
421 enable_compression_after_reply = 0;
422 packet_start_compression(compression_level);
428 * This is called to fork and execute a command when we have no tty. This
429 * will call do_child from the child, and server_loop from the parent after
430 * setting up file descriptors and such.
433 do_exec_no_pty(Session *s, const char *command)
438 int pin[2], pout[2], perr[2];
439 /* Allocate pipes for communicating with the program. */
440 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
441 packet_disconnect("Could not create pipes: %.100s",
443 #else /* USE_PIPES */
444 int inout[2], err[2];
445 /* Uses socket pairs to communicate with the program. */
446 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
447 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
448 packet_disconnect("Could not create socket pairs: %.100s",
450 #endif /* USE_PIPES */
452 fatal("do_exec_no_pty: no session");
454 session_proctitle(s);
457 do_pam_session(s->pw->pw_name, NULL);
459 if (is_pam_password_change_required())
460 packet_disconnect("Password change required but no "
464 /* Fork the child. */
465 if ((pid = fork()) == 0) {
466 fatal_remove_all_cleanups();
468 /* Child. Reinitialize the log since the pid has changed. */
469 log_init(__progname, options.log_level, options.log_facility, log_stderr);
472 * Create a new session and process group since the 4.4BSD
473 * setlogin() affects the entire process group.
476 error("setsid failed: %.100s", strerror(errno));
480 * Redirect stdin. We close the parent side of the socket
481 * pair, and make the child side the standard input.
484 if (dup2(pin[0], 0) < 0)
485 perror("dup2 stdin");
488 /* Redirect stdout. */
490 if (dup2(pout[1], 1) < 0)
491 perror("dup2 stdout");
494 /* Redirect stderr. */
496 if (dup2(perr[1], 2) < 0)
497 perror("dup2 stderr");
499 #else /* USE_PIPES */
501 * Redirect stdin, stdout, and stderr. Stdin and stdout will
502 * use the same socket, as some programs (particularly rdist)
503 * seem to depend on it.
507 if (dup2(inout[0], 0) < 0) /* stdin */
508 perror("dup2 stdin");
509 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
510 perror("dup2 stdout");
511 if (dup2(err[0], 2) < 0) /* stderr */
512 perror("dup2 stderr");
513 #endif /* USE_PIPES */
516 cray_init_job(s->pw); /* set up cray jid and tmpdir */
519 /* Do processing for the child (exec command etc). */
520 do_child(s, command);
524 signal(WJSIGNAL, cray_job_termination_handler);
528 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
531 packet_disconnect("fork failed: %.100s", strerror(errno));
533 /* Set interactive/non-interactive mode. */
534 packet_set_interactive(s->display != NULL);
536 /* We are the parent. Close the child sides of the pipes. */
542 session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]);
544 /* Enter the interactive session. */
545 server_loop(pid, pin[1], pout[0], perr[0]);
546 /* server_loop has closed pin[1], pout[0], and perr[0]. */
548 #else /* USE_PIPES */
549 /* We are the parent. Close the child sides of the socket pairs. */
554 * Enter the interactive session. Note: server_loop must be able to
555 * handle the case that fdin and fdout are the same.
558 session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
560 server_loop(pid, inout[1], inout[1], err[1]);
561 /* server_loop has closed inout[1] and err[1]. */
563 #endif /* USE_PIPES */
567 * This is called to fork and execute a command when we have a tty. This
568 * will call do_child from the child, and server_loop from the parent after
569 * setting up file descriptors, controlling tty, updating wtmp, utmp,
570 * lastlog, and other such operations.
573 do_exec_pty(Session *s, const char *command)
575 int fdout, ptyfd, ttyfd, ptymaster;
579 fatal("do_exec_pty: no session");
584 do_pam_session(s->pw->pw_name, s->tty);
588 /* Fork the child. */
589 if ((pid = fork()) == 0) {
590 fatal_remove_all_cleanups();
592 /* Child. Reinitialize the log because the pid has changed. */
593 log_init(__progname, options.log_level, options.log_facility, log_stderr);
594 /* Close the master side of the pseudo tty. */
597 /* Make the pseudo tty our controlling tty. */
598 pty_make_controlling_tty(&ttyfd, s->tty);
600 /* Redirect stdin/stdout/stderr from the pseudo tty. */
601 if (dup2(ttyfd, 0) < 0)
602 error("dup2 stdin: %s", strerror(errno));
603 if (dup2(ttyfd, 1) < 0)
604 error("dup2 stdout: %s", strerror(errno));
605 if (dup2(ttyfd, 2) < 0)
606 error("dup2 stderr: %s", strerror(errno));
608 /* Close the extra descriptor for the pseudo tty. */
611 /* record login, etc. similar to login(1) */
613 if (!(options.use_login && command == NULL)) {
615 cray_init_job(s->pw); /* set up cray jid and tmpdir */
617 do_login(s, command);
619 # ifdef LOGIN_NEEDS_UTMPX
625 /* Do common processing for the child, such as execing the command. */
626 do_child(s, command);
630 signal(WJSIGNAL, cray_job_termination_handler);
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. */
659 packet_set_interactive(1);
661 session_set_fds(s, ptyfd, fdout, -1);
663 server_loop(pid, ptyfd, fdout, -1);
664 /* server_loop _has_ closed ptyfd and fdout. */
668 #ifdef LOGIN_NEEDS_UTMPX
670 do_pre_login(Session *s)
673 struct sockaddr_storage from;
674 pid_t pid = getpid();
677 * Get IP address of client. If the connection is not a socket, let
678 * the address be 0.0.0.0.
680 memset(&from, 0, sizeof(from));
681 fromlen = sizeof(from);
682 if (packet_connection_is_on_socket()) {
683 if (getpeername(packet_get_connection_in(),
684 (struct sockaddr *) & from, &fromlen) < 0) {
685 debug("getpeername: %.100s", strerror(errno));
690 record_utmp_only(pid, s->tty, s->pw->pw_name,
691 get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
692 (struct sockaddr *)&from);
697 * This is called to fork and execute a command. If another command is
698 * to be forced, execute that instead.
701 do_exec(Session *s, const char *command)
703 if (forced_command) {
704 original_command = command;
705 command = forced_command;
706 debug("Forced command '%.900s'", command);
710 do_exec_pty(s, command);
712 do_exec_no_pty(s, command);
714 original_command = NULL;
718 /* administrative, login(1)-like work */
720 do_login(Session *s, const char *command)
724 struct sockaddr_storage from;
725 struct passwd * pw = s->pw;
726 pid_t pid = getpid();
729 * Get IP address of client. If the connection is not a socket, let
730 * the address be 0.0.0.0.
732 memset(&from, 0, sizeof(from));
733 if (packet_connection_is_on_socket()) {
734 fromlen = sizeof(from);
735 if (getpeername(packet_get_connection_in(),
736 (struct sockaddr *) & from, &fromlen) < 0) {
737 debug("getpeername: %.100s", strerror(errno));
742 /* Record that there was a login on that tty from the remote host. */
744 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
745 get_remote_name_or_ip(utmp_len,
746 options.verify_reverse_mapping),
747 (struct sockaddr *)&from, fromlen);
751 * If password change is needed, do it now.
752 * This needs to occur before the ~/.hushlogin check.
754 if (is_pam_password_change_required()) {
755 print_pam_messages();
760 if (check_quietlogin(s, command))
764 if (!is_pam_password_change_required())
765 print_pam_messages();
767 #ifdef WITH_AIXAUTHENTICATE
768 if (aixloginmsg && *aixloginmsg)
769 printf("%s\n", aixloginmsg);
770 #endif /* WITH_AIXAUTHENTICATE */
772 #ifndef NO_SSH_LASTLOG
773 if (options.print_lastlog && s->last_login_time != 0) {
774 time_string = ctime(&s->last_login_time);
775 if (strchr(time_string, '\n'))
776 *strchr(time_string, '\n') = 0;
777 if (strcmp(s->hostname, "") == 0)
778 printf("Last login: %s\r\n", time_string);
780 printf("Last login: %s from %s\r\n", time_string,
783 #endif /* NO_SSH_LASTLOG */
789 * Display the message of the day.
797 if (options.print_motd) {
798 #ifdef HAVE_LOGIN_CAP
799 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
802 f = fopen("/etc/motd", "r");
805 while (fgets(buf, sizeof(buf), f))
814 * Check for quiet login, either .hushlogin or command given.
817 check_quietlogin(Session *s, const char *command)
820 struct passwd *pw = s->pw;
823 /* Return 1 if .hushlogin exists or a command given. */
826 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
827 #ifdef HAVE_LOGIN_CAP
828 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
831 if (stat(buf, &st) >= 0)
838 * Sets the value of the given variable in the environment. If the variable
839 * already exists, its value is overriden.
842 child_set_env(char ***envp, u_int *envsizep, const char *name,
849 * Find the slot where the value should be stored. If the variable
850 * already exists, we reuse the slot; otherwise we append a new slot
851 * at the end of the array, expanding if necessary.
854 namelen = strlen(name);
855 for (i = 0; env[i]; i++)
856 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
859 /* Reuse the slot. */
862 /* New variable. Expand if necessary. */
863 if (i >= (*envsizep) - 1) {
864 if (*envsizep >= 1000)
865 fatal("child_set_env: too many env vars,"
866 " skipping: %.100s", name);
868 env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *));
870 /* Need to set the NULL pointer at end of array beyond the new slot. */
874 /* Allocate space and format the variable in the appropriate slot. */
875 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
876 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
880 * Reads environment variables from the given file and adds/overrides them
881 * into the environment. If the file does not exist, this does nothing.
882 * Otherwise, it must consist of empty lines, comments (line starts with '#')
883 * and assignments of the form name=value. No other forms are allowed.
886 read_environment_file(char ***env, u_int *envsize,
887 const char *filename)
894 f = fopen(filename, "r");
898 while (fgets(buf, sizeof(buf), f)) {
900 fatal("Too many lines in environment file %s", filename);
901 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
903 if (!*cp || *cp == '#' || *cp == '\n')
905 if (strchr(cp, '\n'))
906 *strchr(cp, '\n') = '\0';
907 value = strchr(cp, '=');
909 fprintf(stderr, "Bad line %u in %.100s\n", lineno,
914 * Replace the equals sign by nul, and advance value to
919 child_set_env(env, envsize, cp, value);
924 void copy_environment(char **source, char ***env, u_int *envsize)
926 char *var_name, *var_val;
932 for(i = 0; source[i] != NULL; i++) {
933 var_name = xstrdup(source[i]);
934 if ((var_val = strstr(var_name, "=")) == NULL) {
940 debug3("Copy environment: %s=%s", var_name, var_val);
941 child_set_env(env, envsize, var_name, var_val);
948 do_setup_env(Session *s, const char *shell)
953 struct passwd *pw = s->pw;
955 /* Initialize the environment. */
957 env = xmalloc(envsize * sizeof(char *));
962 * The Windows environment contains some setting which are
963 * important for a running system. They must not be dropped.
965 copy_environment(environ, &env, &envsize);
968 if (!options.use_login) {
969 /* Set basic environment. */
970 child_set_env(&env, &envsize, "USER", pw->pw_name);
971 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
972 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
973 #ifdef HAVE_LOGIN_CAP
974 if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
975 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
977 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
978 #else /* HAVE_LOGIN_CAP */
981 * There's no standard path on Windows. The path contains
982 * important components pointing to the system directories,
983 * needed for loading shared libraries. So the path better
984 * remains intact here.
986 # ifdef SUPERUSER_PATH
987 child_set_env(&env, &envsize, "PATH",
988 s->pw->pw_uid == 0 ? SUPERUSER_PATH : _PATH_STDPATH);
990 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
991 # endif /* SUPERUSER_PATH */
992 # endif /* HAVE_CYGWIN */
993 #endif /* HAVE_LOGIN_CAP */
995 snprintf(buf, sizeof buf, "%.200s/%.50s",
996 _PATH_MAILDIR, pw->pw_name);
997 child_set_env(&env, &envsize, "MAIL", buf);
999 /* Normal systems set SHELL by default. */
1000 child_set_env(&env, &envsize, "SHELL", shell);
1003 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1005 /* Set custom environment options from RSA authentication. */
1006 if (!options.use_login) {
1007 while (custom_environment) {
1008 struct envstring *ce = custom_environment;
1011 for (i = 0; str[i] != '=' && str[i]; i++)
1013 if (str[i] == '=') {
1015 child_set_env(&env, &envsize, str, str + i + 1);
1017 custom_environment = ce->next;
1023 /* SSH_CLIENT deprecated */
1024 snprintf(buf, sizeof buf, "%.50s %d %d",
1025 get_remote_ipaddr(), get_remote_port(), get_local_port());
1026 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1028 snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
1029 get_remote_ipaddr(), get_remote_port(),
1030 get_local_ipaddr(packet_get_connection_in()), get_local_port());
1031 child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
1034 child_set_env(&env, &envsize, "SSH_TTY", s->tty);
1036 child_set_env(&env, &envsize, "TERM", s->term);
1038 child_set_env(&env, &envsize, "DISPLAY", s->display);
1039 if (original_command)
1040 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
1044 if (cray_tmpdir[0] != '\0')
1045 child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir);
1046 #endif /* _UNICOS */
1052 if ((cp = getenv("AUTHSTATE")) != NULL)
1053 child_set_env(&env, &envsize, "AUTHSTATE", cp);
1054 if ((cp = getenv("KRB5CCNAME")) != NULL)
1055 child_set_env(&env, &envsize, "KRB5CCNAME", cp);
1056 read_environment_file(&env, &envsize, "/etc/environment");
1060 if (s->authctxt->krb4_ticket_file)
1061 child_set_env(&env, &envsize, "KRBTKFILE",
1062 s->authctxt->krb4_ticket_file);
1065 if (s->authctxt->krb5_ticket_file)
1066 child_set_env(&env, &envsize, "KRB5CCNAME",
1067 s->authctxt->krb5_ticket_file);
1071 * Pull in any environment variables that may have
1077 p = fetch_pam_environment();
1078 copy_environment(p, &env, &envsize);
1079 free_pam_environment(p);
1081 #endif /* USE_PAM */
1083 if (auth_sock_name != NULL)
1084 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1087 /* read $HOME/.ssh/environment. */
1088 if (options.permit_user_env && !options.use_login) {
1089 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
1090 strcmp(pw->pw_dir, "/") ? pw->pw_dir : "");
1091 read_environment_file(&env, &envsize, buf);
1094 /* dump the environment */
1095 fprintf(stderr, "Environment:\n");
1096 for (i = 0; env[i]; i++)
1097 fprintf(stderr, " %.200s\n", env[i]);
1103 * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
1104 * first in this order).
1107 do_rc_files(Session *s, const char *shell)
1115 s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
1117 /* ignore _PATH_SSH_USER_RC for subsystems */
1118 if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
1119 snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
1120 shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
1122 fprintf(stderr, "Running %s\n", cmd);
1123 f = popen(cmd, "w");
1126 fprintf(f, "%s %s\n", s->auth_proto,
1130 fprintf(stderr, "Could not run %s\n",
1132 } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
1134 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
1135 _PATH_SSH_SYSTEM_RC);
1136 f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
1139 fprintf(f, "%s %s\n", s->auth_proto,
1143 fprintf(stderr, "Could not run %s\n",
1144 _PATH_SSH_SYSTEM_RC);
1145 } else if (do_xauth && options.xauth_location != NULL) {
1146 /* Add authority data to .Xauthority if appropriate. */
1149 "Running %.500s add "
1150 "%.100s %.100s %.100s\n",
1151 options.xauth_location, s->auth_display,
1152 s->auth_proto, s->auth_data);
1154 snprintf(cmd, sizeof cmd, "%s -q -",
1155 options.xauth_location);
1156 f = popen(cmd, "w");
1158 fprintf(f, "add %s %s %s\n",
1159 s->auth_display, s->auth_proto,
1163 fprintf(stderr, "Could not run %s\n",
1170 do_nologin(struct passwd *pw)
1175 #ifdef HAVE_LOGIN_CAP
1176 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
1177 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
1178 _PATH_NOLOGIN), "r");
1181 f = fopen(_PATH_NOLOGIN, "r");
1184 /* /etc/nologin exists. Print its contents and exit. */
1185 log("User %.100s not allowed because %s exists",
1186 pw->pw_name, _PATH_NOLOGIN);
1187 while (fgets(buf, sizeof(buf), f))
1194 /* Set login name, uid, gid, and groups. */
1196 do_setusercontext(struct passwd *pw)
1200 #else /* HAVE_CYGWIN */
1201 if (getuid() == 0 || geteuid() == 0) {
1202 #endif /* HAVE_CYGWIN */
1203 #ifdef HAVE_SETPCRED
1204 setpcred(pw->pw_name);
1205 #endif /* HAVE_SETPCRED */
1206 #ifdef HAVE_LOGIN_CAP
1210 if (setusercontext(lc, pw, pw->pw_uid,
1211 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1212 perror("unable to set user context");
1216 # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
1217 /* Sets login uid for accounting */
1218 if (getluid() == -1 && setluid(pw->pw_uid) == -1)
1219 error("setluid: %s", strerror(errno));
1220 # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
1222 if (setlogin(pw->pw_name) < 0)
1223 error("setlogin failed: %s", strerror(errno));
1224 if (setgid(pw->pw_gid) < 0) {
1228 /* Initialize the group list. */
1229 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1230 perror("initgroups");
1236 * PAM credentials may take the form of supplementary groups.
1237 * These will have been wiped by the above initgroups() call.
1238 * Reestablish them here.
1241 # endif /* USE_PAM */
1242 # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)
1243 irix_setusercontext(pw);
1244 # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
1248 /* Permanently switch to the desired uid. */
1249 permanently_set_uid(pw);
1252 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1253 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1257 launch_login(struct passwd *pw, const char *hostname)
1259 /* Launch login(1). */
1261 execl(LOGIN_PROGRAM, "login", "-h", hostname,
1262 #ifdef xxxLOGIN_NEEDS_TERM
1263 (s->term ? s->term : "unknown"),
1264 #endif /* LOGIN_NEEDS_TERM */
1265 #ifdef LOGIN_NO_ENDOPT
1266 "-p", "-f", pw->pw_name, (char *)NULL);
1268 "-p", "-f", "--", pw->pw_name, (char *)NULL);
1271 /* Login couldn't be executed, die. */
1278 * Performs common processing for the child, such as setting up the
1279 * environment, closing extra file descriptors, setting the user and group
1280 * ids, and executing the command or shell.
1283 do_child(Session *s, const char *command)
1285 extern char **environ;
1288 const char *shell, *shell0, *hostname = NULL;
1289 struct passwd *pw = s->pw;
1292 /* remove hostkey from the child's memory */
1293 destroy_sensitive_data();
1295 /* login(1) is only called if we execute the login shell */
1296 if (options.use_login && command != NULL)
1297 options.use_login = 0;
1300 cray_setup(pw->pw_uid, pw->pw_name, command);
1301 #endif /* _UNICOS */
1304 * Login(1) does this as well, and it needs uid 0 for the "-h"
1305 * switch, so we let login(1) to this for us.
1307 if (!options.use_login) {
1309 session_setup_sia(pw->pw_name, s->ttyfd == -1 ? NULL : s->tty);
1310 if (!check_quietlogin(s, command))
1312 #else /* HAVE_OSF_SIA */
1314 do_setusercontext(pw);
1315 #endif /* HAVE_OSF_SIA */
1319 * Get the shell from the password data. An empty shell field is
1320 * legal, and means /bin/sh.
1322 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1323 #ifdef HAVE_LOGIN_CAP
1324 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1327 env = do_setup_env(s, shell);
1329 /* we have to stash the hostname before we close our socket. */
1330 if (options.use_login)
1331 hostname = get_remote_name_or_ip(utmp_len,
1332 options.verify_reverse_mapping);
1334 * Close the connection descriptors; note that this is the child, and
1335 * the server will still have the socket open, and it is important
1336 * that we do not shutdown it. Note that the descriptors cannot be
1337 * closed before building the environment, as we call
1338 * get_remote_ipaddr there.
1340 if (packet_get_connection_in() == packet_get_connection_out())
1341 close(packet_get_connection_in());
1343 close(packet_get_connection_in());
1344 close(packet_get_connection_out());
1347 * Close all descriptors related to channels. They will still remain
1348 * open in the parent.
1350 /* XXX better use close-on-exec? -markus */
1351 channel_close_all();
1354 * Close any extra file descriptors. Note that there may still be
1355 * descriptors left by system functions. They will be closed later.
1360 * Close any extra open file descriptors so that we don\'t have them
1361 * hanging around in clients. Note that we want to do this after
1362 * initgroups, because at least on Solaris 2.3 it leaves file
1365 for (i = 3; i < 64; i++)
1369 * Must take new environment into use so that .ssh/rc,
1370 * /etc/ssh/sshrc and xauth are run in the proper environment.
1375 /* Try to get AFS tokens for the local cell. */
1379 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1380 krb_afslog(cell, 0);
1386 /* Change current directory to the user\'s home directory. */
1387 if (chdir(pw->pw_dir) < 0) {
1388 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1389 pw->pw_dir, strerror(errno));
1390 #ifdef HAVE_LOGIN_CAP
1391 if (login_getcapbool(lc, "requirehome", 0))
1396 if (!options.use_login)
1397 do_rc_files(s, shell);
1399 /* restore SIGPIPE for child */
1400 signal(SIGPIPE, SIG_DFL);
1402 if (options.use_login) {
1403 launch_login(pw, hostname);
1407 /* Get the last component of the shell name. */
1408 if ((shell0 = strrchr(shell, '/')) != NULL)
1414 * If we have no command, execute the shell. In this case, the shell
1415 * name to be passed in argv[0] is preceded by '-' to indicate that
1416 * this is a login shell.
1421 /* Start the shell. Set initial character to '-'. */
1424 if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1425 >= sizeof(argv0) - 1) {
1431 /* Execute the shell. */
1434 execve(shell, argv, env);
1436 /* Executing the shell failed. */
1441 * Execute the command using the user's shell. This uses the -c
1442 * option to execute the command.
1444 argv[0] = (char *) shell0;
1446 argv[2] = (char *) command;
1448 execve(shell, argv, env);
1457 static int did_init = 0;
1459 debug("session_new: init");
1460 for (i = 0; i < MAX_SESSIONS; i++) {
1461 sessions[i].used = 0;
1465 for (i = 0; i < MAX_SESSIONS; i++) {
1466 Session *s = &sessions[i];
1468 memset(s, 0, sizeof(*s));
1474 debug("session_new: session %d", i);
1485 for (i = 0; i < MAX_SESSIONS; i++) {
1486 Session *s = &sessions[i];
1487 debug("dump: used %d session %d %p channel %d pid %ld",
1497 session_open(Authctxt *authctxt, int chanid)
1499 Session *s = session_new();
1500 debug("session_open: channel %d", chanid);
1502 error("no more sessions");
1505 s->authctxt = authctxt;
1506 s->pw = authctxt->pw;
1508 fatal("no user for session %d", s->self);
1509 debug("session_open: session %d: link with channel %d", s->self, chanid);
1515 session_by_tty(char *tty)
1518 for (i = 0; i < MAX_SESSIONS; i++) {
1519 Session *s = &sessions[i];
1520 if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1521 debug("session_by_tty: session %d tty %s", i, tty);
1525 debug("session_by_tty: unknown tty %.100s", tty);
1531 session_by_channel(int id)
1534 for (i = 0; i < MAX_SESSIONS; i++) {
1535 Session *s = &sessions[i];
1536 if (s->used && s->chanid == id) {
1537 debug("session_by_channel: session %d channel %d", i, id);
1541 debug("session_by_channel: unknown channel %d", id);
1547 session_by_pid(pid_t pid)
1550 debug("session_by_pid: pid %ld", (long)pid);
1551 for (i = 0; i < MAX_SESSIONS; i++) {
1552 Session *s = &sessions[i];
1553 if (s->used && s->pid == pid)
1556 error("session_by_pid: unknown pid %ld", (long)pid);
1562 session_window_change_req(Session *s)
1564 s->col = packet_get_int();
1565 s->row = packet_get_int();
1566 s->xpixel = packet_get_int();
1567 s->ypixel = packet_get_int();
1569 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1574 session_pty_req(Session *s)
1580 debug("Allocating a pty not permitted for this authentication.");
1583 if (s->ttyfd != -1) {
1584 packet_disconnect("Protocol error: you already have a pty.");
1587 /* Get the time and hostname when the user last logged in. */
1588 if (options.print_lastlog) {
1589 s->hostname[0] = '\0';
1590 s->last_login_time = get_last_login_time(s->pw->pw_uid,
1591 s->pw->pw_name, s->hostname, sizeof(s->hostname));
1594 s->term = packet_get_string(&len);
1597 s->col = packet_get_int();
1598 s->row = packet_get_int();
1600 s->row = packet_get_int();
1601 s->col = packet_get_int();
1603 s->xpixel = packet_get_int();
1604 s->ypixel = packet_get_int();
1606 if (strcmp(s->term, "") == 0) {
1611 /* Allocate a pty and open it. */
1612 debug("Allocating pty.");
1613 if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) {
1619 error("session_pty_req: session %d alloc failed", s->self);
1622 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1624 /* for SSH1 the tty modes length is not given */
1626 n_bytes = packet_remaining();
1627 tty_parse_modes(s->ttyfd, &n_bytes);
1630 * Add a cleanup function to clear the utmp entry and record logout
1631 * time in case we call fatal() (e.g., the connection gets closed).
1633 fatal_add_cleanup(session_pty_cleanup, (void *)s);
1635 pty_setowner(s->pw, s->tty);
1637 /* Set window size from the packet. */
1638 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1641 session_proctitle(s);
1646 session_subsystem_req(Session *s)
1651 char *cmd, *subsys = packet_get_string(&len);
1655 log("subsystem request for %.100s", subsys);
1657 for (i = 0; i < options.num_subsystems; i++) {
1658 if (strcmp(subsys, options.subsystem_name[i]) == 0) {
1659 cmd = options.subsystem_command[i];
1660 if (stat(cmd, &st) < 0) {
1661 error("subsystem: cannot stat %s: %s", cmd,
1665 debug("subsystem: exec() %s", cmd);
1666 s->is_subsystem = 1;
1674 log("subsystem request for %.100s failed, subsystem not found",
1682 session_x11_req(Session *s)
1686 s->single_connection = packet_get_char();
1687 s->auth_proto = packet_get_string(NULL);
1688 s->auth_data = packet_get_string(NULL);
1689 s->screen = packet_get_int();
1692 success = session_setup_x11fwd(s);
1694 xfree(s->auth_proto);
1695 xfree(s->auth_data);
1696 s->auth_proto = NULL;
1697 s->auth_data = NULL;
1703 session_shell_req(Session *s)
1711 session_exec_req(Session *s)
1714 char *command = packet_get_string(&len);
1716 do_exec(s, command);
1722 session_auth_agent_req(Session *s)
1724 static int called = 0;
1726 if (no_agent_forwarding_flag) {
1727 debug("session_auth_agent_req: no_agent_forwarding_flag");
1734 return auth_input_request_forwarding(s->pw);
1739 session_input_channel_req(Channel *c, const char *rtype)
1744 if ((s = session_by_channel(c->self)) == NULL) {
1745 log("session_input_channel_req: no session %d req %.100s",
1749 debug("session_input_channel_req: session %d req %s", s->self, rtype);
1752 * a session is in LARVAL state until a shell, a command
1753 * or a subsystem is executed
1755 if (c->type == SSH_CHANNEL_LARVAL) {
1756 if (strcmp(rtype, "shell") == 0) {
1757 success = session_shell_req(s);
1758 } else if (strcmp(rtype, "exec") == 0) {
1759 success = session_exec_req(s);
1760 } else if (strcmp(rtype, "pty-req") == 0) {
1761 success = session_pty_req(s);
1762 } else if (strcmp(rtype, "x11-req") == 0) {
1763 success = session_x11_req(s);
1764 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1765 success = session_auth_agent_req(s);
1766 } else if (strcmp(rtype, "subsystem") == 0) {
1767 success = session_subsystem_req(s);
1770 if (strcmp(rtype, "window-change") == 0) {
1771 success = session_window_change_req(s);
1777 session_set_fds(Session *s, int fdin, int fdout, int fderr)
1780 fatal("session_set_fds: called for proto != 2.0");
1782 * now that have a child and a pipe to the child,
1783 * we can activate our channel and register the fd's
1785 if (s->chanid == -1)
1786 fatal("no channel for session %d", s->self);
1787 channel_set_fds(s->chanid,
1789 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1791 CHAN_SES_WINDOW_DEFAULT);
1795 * Function to perform pty cleanup. Also called if we get aborted abnormally
1796 * (e.g., due to a dropped connection).
1799 session_pty_cleanup2(void *session)
1801 Session *s = session;
1804 error("session_pty_cleanup: no session");
1810 debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
1812 /* Record that the user has logged out. */
1814 record_logout(s->pid, s->tty, s->pw->pw_name);
1816 /* Release the pseudo-tty. */
1818 pty_release(s->tty);
1821 * Close the server side of the socket pairs. We must do this after
1822 * the pty cleanup, so that another process doesn't get this pty
1823 * while we're still cleaning up.
1825 if (close(s->ptymaster) < 0)
1826 error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
1828 /* unlink pty from session */
1833 session_pty_cleanup(void *session)
1835 PRIVSEP(session_pty_cleanup2(session));
1841 #define SSH_SIG(x) if (sig == SIG ## x) return #x
1856 return "SIG@openssh.com";
1860 session_exit_message(Session *s, int status)
1864 if ((c = channel_lookup(s->chanid)) == NULL)
1865 fatal("session_exit_message: session %d: no channel %d",
1866 s->self, s->chanid);
1867 debug("session_exit_message: session %d channel %d pid %ld",
1868 s->self, s->chanid, (long)s->pid);
1870 if (WIFEXITED(status)) {
1871 channel_request_start(s->chanid, "exit-status", 0);
1872 packet_put_int(WEXITSTATUS(status));
1874 } else if (WIFSIGNALED(status)) {
1875 channel_request_start(s->chanid, "exit-signal", 0);
1876 packet_put_cstring(sig2name(WTERMSIG(status)));
1878 packet_put_char(WCOREDUMP(status));
1879 #else /* WCOREDUMP */
1881 #endif /* WCOREDUMP */
1882 packet_put_cstring("");
1883 packet_put_cstring("");
1886 /* Some weird exit cause. Just exit. */
1887 packet_disconnect("wait returned status %04x.", status);
1890 /* disconnect channel */
1891 debug("session_exit_message: release channel %d", s->chanid);
1892 channel_cancel_cleanup(s->chanid);
1894 * emulate a write failure with 'chan_write_failed', nobody will be
1895 * interested in data we write.
1896 * Note that we must not call 'chan_read_failed', since there could
1897 * be some more data waiting in the pipe.
1899 if (c->ostate != CHAN_OUTPUT_CLOSED)
1900 chan_write_failed(c);
1905 session_close(Session *s)
1907 debug("session_close: session %d pid %ld", s->self, (long)s->pid);
1908 if (s->ttyfd != -1) {
1909 fatal_remove_cleanup(session_pty_cleanup, (void *)s);
1910 session_pty_cleanup(s);
1916 if (s->auth_display)
1917 xfree(s->auth_display);
1919 xfree(s->auth_data);
1921 xfree(s->auth_proto);
1923 session_proctitle(s);
1927 session_close_by_pid(pid_t pid, int status)
1929 Session *s = session_by_pid(pid);
1931 debug("session_close_by_pid: no session for pid %ld",
1935 if (s->chanid != -1)
1936 session_exit_message(s, status);
1941 * this is called when a channel dies before
1942 * the session 'child' itself dies
1945 session_close_by_channel(int id, void *arg)
1947 Session *s = session_by_channel(id);
1949 debug("session_close_by_channel: no session for id %d", id);
1952 debug("session_close_by_channel: channel %d child %ld",
1955 debug("session_close_by_channel: channel %d: has child", id);
1957 * delay detach of session, but release pty, since
1958 * the fd's to the child are already closed
1960 if (s->ttyfd != -1) {
1961 fatal_remove_cleanup(session_pty_cleanup, (void *)s);
1962 session_pty_cleanup(s);
1966 /* detach by removing callback */
1967 channel_cancel_cleanup(s->chanid);
1973 session_destroy_all(void (*closefunc)(Session *))
1976 for (i = 0; i < MAX_SESSIONS; i++) {
1977 Session *s = &sessions[i];
1979 if (closefunc != NULL)
1988 session_tty_list(void)
1990 static char buf[1024];
1993 for (i = 0; i < MAX_SESSIONS; i++) {
1994 Session *s = &sessions[i];
1995 if (s->used && s->ttyfd != -1) {
1997 strlcat(buf, ",", sizeof buf);
1998 strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
2002 strlcpy(buf, "notty", sizeof buf);
2007 session_proctitle(Session *s)
2010 error("no user for session %d", s->self);
2012 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
2016 session_setup_x11fwd(Session *s)
2019 char display[512], auth_display[512];
2020 char hostname[MAXHOSTNAMELEN];
2022 if (no_x11_forwarding_flag) {
2023 packet_send_debug("X11 forwarding disabled in user configuration file.");
2026 if (!options.x11_forwarding) {
2027 debug("X11 forwarding disabled in server configuration file.");
2030 if (!options.xauth_location ||
2031 (stat(options.xauth_location, &st) == -1)) {
2032 packet_send_debug("No xauth program; cannot forward with spoofing.");
2035 if (options.use_login) {
2036 packet_send_debug("X11 forwarding disabled; "
2037 "not compatible with UseLogin=yes.");
2040 if (s->display != NULL) {
2041 debug("X11 display already set.");
2044 if (x11_create_display_inet(options.x11_display_offset,
2045 options.x11_use_localhost, s->single_connection,
2046 &s->display_number) == -1) {
2047 debug("x11_create_display_inet failed.");
2051 /* Set up a suitable value for the DISPLAY variable. */
2052 if (gethostname(hostname, sizeof(hostname)) < 0)
2053 fatal("gethostname: %.100s", strerror(errno));
2055 * auth_display must be used as the displayname when the
2056 * authorization entry is added with xauth(1). This will be
2057 * different than the DISPLAY string for localhost displays.
2059 if (options.x11_use_localhost) {
2060 snprintf(display, sizeof display, "localhost:%u.%u",
2061 s->display_number, s->screen);
2062 snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
2063 s->display_number, s->screen);
2064 s->display = xstrdup(display);
2065 s->auth_display = xstrdup(auth_display);
2067 #ifdef IPADDR_IN_DISPLAY
2069 struct in_addr my_addr;
2071 he = gethostbyname(hostname);
2073 error("Can't get IP address for X11 DISPLAY.");
2074 packet_send_debug("Can't get IP address for X11 DISPLAY.");
2077 memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
2078 snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr),
2079 s->display_number, s->screen);
2081 snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
2082 s->display_number, s->screen);
2084 s->display = xstrdup(display);
2085 s->auth_display = xstrdup(display);
2092 do_authenticated2(Authctxt *authctxt)
2094 server_loop2(authctxt);