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 1.136 2002/06/10 22:28:41 markus 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.%d",
166 auth_sock_dir, (int) 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) {
213 #ifdef WITH_AIXAUTHENTICATE
214 /* We don't have a pty yet, so just label the line as "ssh" */
215 if (loginsuccess(authctxt->user,
216 get_canonical_hostname(options.verify_reverse_mapping),
217 "ssh", &aixloginmsg) < 0)
219 #endif /* WITH_AIXAUTHENTICATE */
221 /* setup the channel layer */
222 if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
223 channel_permit_all_opens();
226 do_authenticated2(authctxt);
228 do_authenticated1(authctxt);
230 /* remove agent socket */
231 if (auth_sock_name != NULL)
232 auth_sock_cleanup_proc(authctxt->pw);
234 if (options.kerberos_ticket_cleanup)
235 krb4_cleanup_proc(authctxt);
238 if (options.kerberos_ticket_cleanup)
239 krb5_cleanup_proc(authctxt);
244 * Prepares for an interactive session. This is called after the user has
245 * been successfully authenticated. During this message exchange, pseudo
246 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
247 * are requested, etc.
250 do_authenticated1(Authctxt *authctxt)
254 int success, type, screen_flag;
255 int compression_level = 0, enable_compression_after_reply = 0;
256 u_int proto_len, data_len, dlen;
259 s->authctxt = authctxt;
260 s->pw = authctxt->pw;
263 * We stay in this loop until the client requests to execute a shell
269 /* Get a packet from the client. */
270 type = packet_read();
272 /* Process the packet. */
274 case SSH_CMSG_REQUEST_COMPRESSION:
275 compression_level = packet_get_int();
277 if (compression_level < 1 || compression_level > 9) {
278 packet_send_debug("Received illegal compression level %d.",
282 /* Enable compression after we have responded with SUCCESS. */
283 enable_compression_after_reply = 1;
287 case SSH_CMSG_REQUEST_PTY:
288 success = session_pty_req(s);
291 case SSH_CMSG_X11_REQUEST_FORWARDING:
292 s->auth_proto = packet_get_string(&proto_len);
293 s->auth_data = packet_get_string(&data_len);
295 screen_flag = packet_get_protocol_flags() &
296 SSH_PROTOFLAG_SCREEN_NUMBER;
297 debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
299 if (packet_remaining() == 4) {
301 debug2("Buggy client: "
302 "X11 screen flag missing");
303 s->screen = packet_get_int();
308 success = session_setup_x11fwd(s);
310 xfree(s->auth_proto);
312 s->auth_proto = NULL;
317 case SSH_CMSG_AGENT_REQUEST_FORWARDING:
318 if (no_agent_forwarding_flag || compat13) {
319 debug("Authentication agent forwarding not permitted for this authentication.");
322 debug("Received authentication agent forwarding request.");
323 success = auth_input_request_forwarding(s->pw);
326 case SSH_CMSG_PORT_FORWARD_REQUEST:
327 if (no_port_forwarding_flag) {
328 debug("Port forwarding not permitted for this authentication.");
331 if (!options.allow_tcp_forwarding) {
332 debug("Port forwarding not permitted.");
335 debug("Received TCP/IP port forwarding request.");
336 channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
340 case SSH_CMSG_MAX_PACKET_SIZE:
341 if (packet_set_maxsize(packet_get_int()) > 0)
345 #if defined(AFS) || defined(KRB5)
346 case SSH_CMSG_HAVE_KERBEROS_TGT:
347 if (!options.kerberos_tgt_passing) {
348 verbose("Kerberos TGT passing disabled.");
350 char *kdata = packet_get_string(&dlen);
353 /* XXX - 0x41, see creds_to_radix version */
354 if (kdata[0] != 0x41) {
360 if (auth_krb5_tgt(s->authctxt, &tgt))
363 verbose("Kerberos v5 TGT refused for %.100s", s->authctxt->user);
367 if (auth_krb4_tgt(s->authctxt, kdata))
370 verbose("Kerberos v4 TGT refused for %.100s", s->authctxt->user);
376 #endif /* AFS || KRB5 */
379 case SSH_CMSG_HAVE_AFS_TOKEN:
380 if (!options.afs_token_passing || !k_hasafs()) {
381 verbose("AFS token passing disabled.");
383 /* Accept AFS token. */
384 char *token = packet_get_string(&dlen);
387 if (auth_afs_token(s->authctxt, token))
390 verbose("AFS token refused for %.100s",
397 case SSH_CMSG_EXEC_SHELL:
398 case SSH_CMSG_EXEC_CMD:
399 if (type == SSH_CMSG_EXEC_CMD) {
400 command = packet_get_string(&dlen);
401 debug("Exec command '%.500s'", command);
413 * Any unknown messages in this phase are ignored,
414 * and a failure message is returned.
416 log("Unknown packet type received after authentication: %d", type);
418 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
422 /* Enable compression now that we have replied if appropriate. */
423 if (enable_compression_after_reply) {
424 enable_compression_after_reply = 0;
425 packet_start_compression(compression_level);
431 * This is called to fork and execute a command when we have no tty. This
432 * will call do_child from the child, and server_loop from the parent after
433 * setting up file descriptors and such.
436 do_exec_no_pty(Session *s, const char *command)
441 int pin[2], pout[2], perr[2];
442 /* Allocate pipes for communicating with the program. */
443 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
444 packet_disconnect("Could not create pipes: %.100s",
446 #else /* USE_PIPES */
447 int inout[2], err[2];
448 /* Uses socket pairs to communicate with the program. */
449 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
450 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
451 packet_disconnect("Could not create socket pairs: %.100s",
453 #endif /* USE_PIPES */
455 fatal("do_exec_no_pty: no session");
457 session_proctitle(s);
460 do_pam_session(s->pw->pw_name, NULL);
462 if (is_pam_password_change_required())
463 packet_disconnect("Password change required but no "
467 /* Fork the child. */
468 if ((pid = fork()) == 0) {
469 /* Child. Reinitialize the log since the pid has changed. */
470 log_init(__progname, options.log_level, options.log_facility, log_stderr);
473 * Create a new session and process group since the 4.4BSD
474 * setlogin() affects the entire process group.
477 error("setsid failed: %.100s", strerror(errno));
481 * Redirect stdin. We close the parent side of the socket
482 * pair, and make the child side the standard input.
485 if (dup2(pin[0], 0) < 0)
486 perror("dup2 stdin");
489 /* Redirect stdout. */
491 if (dup2(pout[1], 1) < 0)
492 perror("dup2 stdout");
495 /* Redirect stderr. */
497 if (dup2(perr[1], 2) < 0)
498 perror("dup2 stderr");
500 #else /* USE_PIPES */
502 * Redirect stdin, stdout, and stderr. Stdin and stdout will
503 * use the same socket, as some programs (particularly rdist)
504 * seem to depend on it.
508 if (dup2(inout[0], 0) < 0) /* stdin */
509 perror("dup2 stdin");
510 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
511 perror("dup2 stdout");
512 if (dup2(err[0], 2) < 0) /* stderr */
513 perror("dup2 stderr");
514 #endif /* USE_PIPES */
516 /* Do processing for the child (exec command etc). */
517 do_child(s, command);
522 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
525 packet_disconnect("fork failed: %.100s", strerror(errno));
527 /* Set interactive/non-interactive mode. */
528 packet_set_interactive(s->display != NULL);
530 /* We are the parent. Close the child sides of the pipes. */
536 session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]);
538 /* Enter the interactive session. */
539 server_loop(pid, pin[1], pout[0], perr[0]);
540 /* server_loop has closed pin[1], pout[0], and perr[0]. */
542 #else /* USE_PIPES */
543 /* We are the parent. Close the child sides of the socket pairs. */
548 * Enter the interactive session. Note: server_loop must be able to
549 * handle the case that fdin and fdout are the same.
552 session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
554 server_loop(pid, inout[1], inout[1], err[1]);
555 /* server_loop has closed inout[1] and err[1]. */
557 #endif /* USE_PIPES */
561 * This is called to fork and execute a command when we have a tty. This
562 * will call do_child from the child, and server_loop from the parent after
563 * setting up file descriptors, controlling tty, updating wtmp, utmp,
564 * lastlog, and other such operations.
567 do_exec_pty(Session *s, const char *command)
569 int fdout, ptyfd, ttyfd, ptymaster;
573 fatal("do_exec_pty: no session");
578 do_pam_session(s->pw->pw_name, s->tty);
582 /* Fork the child. */
583 if ((pid = fork()) == 0) {
585 /* Child. Reinitialize the log because the pid has changed. */
586 log_init(__progname, options.log_level, options.log_facility, log_stderr);
587 /* Close the master side of the pseudo tty. */
590 /* Make the pseudo tty our controlling tty. */
591 pty_make_controlling_tty(&ttyfd, s->tty);
593 /* Redirect stdin/stdout/stderr from the pseudo tty. */
594 if (dup2(ttyfd, 0) < 0)
595 error("dup2 stdin: %s", strerror(errno));
596 if (dup2(ttyfd, 1) < 0)
597 error("dup2 stdout: %s", strerror(errno));
598 if (dup2(ttyfd, 2) < 0)
599 error("dup2 stderr: %s", strerror(errno));
601 /* Close the extra descriptor for the pseudo tty. */
604 /* record login, etc. similar to login(1) */
606 if (!(options.use_login && command == NULL))
607 do_login(s, command);
608 # ifdef LOGIN_NEEDS_UTMPX
614 /* Do common processing for the child, such as execing the command. */
615 do_child(s, command);
620 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
623 packet_disconnect("fork failed: %.100s", strerror(errno));
626 /* Parent. Close the slave side of the pseudo tty. */
630 * Create another descriptor of the pty master side for use as the
631 * standard input. We could use the original descriptor, but this
632 * simplifies code in server_loop. The descriptor is bidirectional.
636 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
638 /* we keep a reference to the pty master */
639 ptymaster = dup(ptyfd);
641 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
642 s->ptymaster = ptymaster;
644 /* Enter interactive session. */
645 packet_set_interactive(1);
647 session_set_fds(s, ptyfd, fdout, -1);
649 server_loop(pid, ptyfd, fdout, -1);
650 /* server_loop _has_ closed ptyfd and fdout. */
654 #ifdef LOGIN_NEEDS_UTMPX
656 do_pre_login(Session *s)
659 struct sockaddr_storage from;
660 pid_t pid = getpid();
663 * Get IP address of client. If the connection is not a socket, let
664 * the address be 0.0.0.0.
666 memset(&from, 0, sizeof(from));
667 if (packet_connection_is_on_socket()) {
668 fromlen = sizeof(from);
669 if (getpeername(packet_get_connection_in(),
670 (struct sockaddr *) & from, &fromlen) < 0) {
671 debug("getpeername: %.100s", strerror(errno));
676 record_utmp_only(pid, s->tty, s->pw->pw_name,
677 get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
678 (struct sockaddr *)&from);
683 * This is called to fork and execute a command. If another command is
684 * to be forced, execute that instead.
687 do_exec(Session *s, const char *command)
689 if (forced_command) {
690 original_command = command;
691 command = forced_command;
692 debug("Forced command '%.900s'", command);
696 do_exec_pty(s, command);
698 do_exec_no_pty(s, command);
700 original_command = NULL;
704 /* administrative, login(1)-like work */
706 do_login(Session *s, const char *command)
710 struct sockaddr_storage from;
711 struct passwd * pw = s->pw;
712 pid_t pid = getpid();
715 * Get IP address of client. If the connection is not a socket, let
716 * the address be 0.0.0.0.
718 memset(&from, 0, sizeof(from));
719 if (packet_connection_is_on_socket()) {
720 fromlen = sizeof(from);
721 if (getpeername(packet_get_connection_in(),
722 (struct sockaddr *) & from, &fromlen) < 0) {
723 debug("getpeername: %.100s", strerror(errno));
728 /* Record that there was a login on that tty from the remote host. */
730 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
731 get_remote_name_or_ip(utmp_len,
732 options.verify_reverse_mapping),
733 (struct sockaddr *)&from);
737 * If password change is needed, do it now.
738 * This needs to occur before the ~/.hushlogin check.
740 if (is_pam_password_change_required()) {
741 print_pam_messages();
746 if (check_quietlogin(s, command))
750 if (!is_pam_password_change_required())
751 print_pam_messages();
753 #ifdef WITH_AIXAUTHENTICATE
754 if (aixloginmsg && *aixloginmsg)
755 printf("%s\n", aixloginmsg);
756 #endif /* WITH_AIXAUTHENTICATE */
758 if (options.print_lastlog && s->last_login_time != 0) {
759 time_string = ctime(&s->last_login_time);
760 if (strchr(time_string, '\n'))
761 *strchr(time_string, '\n') = 0;
762 if (strcmp(s->hostname, "") == 0)
763 printf("Last login: %s\r\n", time_string);
765 printf("Last login: %s from %s\r\n", time_string,
773 * Display the message of the day.
781 if (options.print_motd) {
782 #ifdef HAVE_LOGIN_CAP
783 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
786 f = fopen("/etc/motd", "r");
789 while (fgets(buf, sizeof(buf), f))
798 * Check for quiet login, either .hushlogin or command given.
801 check_quietlogin(Session *s, const char *command)
804 struct passwd *pw = s->pw;
807 /* Return 1 if .hushlogin exists or a command given. */
810 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
811 #ifdef HAVE_LOGIN_CAP
812 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
815 if (stat(buf, &st) >= 0)
822 * Sets the value of the given variable in the environment. If the variable
823 * already exists, its value is overriden.
826 child_set_env(char ***envp, u_int *envsizep, const char *name,
833 * Find the slot where the value should be stored. If the variable
834 * already exists, we reuse the slot; otherwise we append a new slot
835 * at the end of the array, expanding if necessary.
838 namelen = strlen(name);
839 for (i = 0; env[i]; i++)
840 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
843 /* Reuse the slot. */
846 /* New variable. Expand if necessary. */
847 if (i >= (*envsizep) - 1) {
849 env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *));
851 /* Need to set the NULL pointer at end of array beyond the new slot. */
855 /* Allocate space and format the variable in the appropriate slot. */
856 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
857 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
861 * Reads environment variables from the given file and adds/overrides them
862 * into the environment. If the file does not exist, this does nothing.
863 * Otherwise, it must consist of empty lines, comments (line starts with '#')
864 * and assignments of the form name=value. No other forms are allowed.
867 read_environment_file(char ***env, u_int *envsize,
868 const char *filename)
874 f = fopen(filename, "r");
878 while (fgets(buf, sizeof(buf), f)) {
879 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
881 if (!*cp || *cp == '#' || *cp == '\n')
883 if (strchr(cp, '\n'))
884 *strchr(cp, '\n') = '\0';
885 value = strchr(cp, '=');
887 fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf);
891 * Replace the equals sign by nul, and advance value to
896 child_set_env(env, envsize, cp, value);
901 void copy_environment(char **source, char ***env, u_int *envsize)
903 char *var_name, *var_val;
909 for(i = 0; source[i] != NULL; i++) {
910 var_name = xstrdup(source[i]);
911 if ((var_val = strstr(var_name, "=")) == NULL) {
917 debug3("Copy environment: %s=%s", var_name, var_val);
918 child_set_env(env, envsize, var_name, var_val);
925 do_setup_env(Session *s, const char *shell)
930 struct passwd *pw = s->pw;
932 /* Initialize the environment. */
934 env = xmalloc(envsize * sizeof(char *));
939 * The Windows environment contains some setting which are
940 * important for a running system. They must not be dropped.
942 copy_environment(environ, &env, &envsize);
945 if (!options.use_login) {
946 /* Set basic environment. */
947 child_set_env(&env, &envsize, "USER", pw->pw_name);
948 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
949 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
950 #ifdef HAVE_LOGIN_CAP
951 (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH);
952 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
953 #else /* HAVE_LOGIN_CAP */
956 * There's no standard path on Windows. The path contains
957 * important components pointing to the system directories,
958 * needed for loading shared libraries. So the path better
959 * remains intact here.
961 # ifdef SUPERUSER_PATH
962 child_set_env(&env, &envsize, "PATH",
963 s->pw->pw_uid == 0 ? SUPERUSER_PATH : _PATH_STDPATH);
965 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
966 # endif /* SUPERUSER_PATH */
967 # endif /* HAVE_CYGWIN */
968 #endif /* HAVE_LOGIN_CAP */
970 snprintf(buf, sizeof buf, "%.200s/%.50s",
971 _PATH_MAILDIR, pw->pw_name);
972 child_set_env(&env, &envsize, "MAIL", buf);
974 /* Normal systems set SHELL by default. */
975 child_set_env(&env, &envsize, "SHELL", shell);
978 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
980 /* Set custom environment options from RSA authentication. */
981 if (!options.use_login) {
982 while (custom_environment) {
983 struct envstring *ce = custom_environment;
986 for (i = 0; s[i] != '=' && s[i]; i++)
990 child_set_env(&env, &envsize, s, s + i + 1);
992 custom_environment = ce->next;
998 snprintf(buf, sizeof buf, "%.50s %d %d",
999 get_remote_ipaddr(), get_remote_port(), get_local_port());
1000 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1003 child_set_env(&env, &envsize, "SSH_TTY", s->tty);
1005 child_set_env(&env, &envsize, "TERM", s->term);
1007 child_set_env(&env, &envsize, "DISPLAY", s->display);
1008 if (original_command)
1009 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
1016 if ((cp = getenv("AUTHSTATE")) != NULL)
1017 child_set_env(&env, &envsize, "AUTHSTATE", cp);
1018 if ((cp = getenv("KRB5CCNAME")) != NULL)
1019 child_set_env(&env, &envsize, "KRB5CCNAME", cp);
1020 read_environment_file(&env, &envsize, "/etc/environment");
1024 if (s->authctxt->krb4_ticket_file)
1025 child_set_env(&env, &envsize, "KRBTKFILE",
1026 s->authctxt->krb4_ticket_file);
1029 if (s->authctxt->krb5_ticket_file)
1030 child_set_env(&env, &envsize, "KRB5CCNAME",
1031 s->authctxt->krb5_ticket_file);
1034 /* Pull in any environment variables that may have been set by PAM. */
1035 copy_environment(fetch_pam_environment(), &env, &envsize);
1036 #endif /* USE_PAM */
1038 if (auth_sock_name != NULL)
1039 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1042 /* read $HOME/.ssh/environment. */
1043 if (!options.use_login) {
1044 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
1046 read_environment_file(&env, &envsize, buf);
1049 /* dump the environment */
1050 fprintf(stderr, "Environment:\n");
1051 for (i = 0; env[i]; i++)
1052 fprintf(stderr, " %.200s\n", env[i]);
1058 * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
1059 * first in this order).
1062 do_rc_files(Session *s, const char *shell)
1070 s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
1072 /* ignore _PATH_SSH_USER_RC for subsystems */
1073 if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
1074 snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
1075 shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
1077 fprintf(stderr, "Running %s\n", cmd);
1078 f = popen(cmd, "w");
1081 fprintf(f, "%s %s\n", s->auth_proto,
1085 fprintf(stderr, "Could not run %s\n",
1087 } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
1089 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
1090 _PATH_SSH_SYSTEM_RC);
1091 f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
1094 fprintf(f, "%s %s\n", s->auth_proto,
1098 fprintf(stderr, "Could not run %s\n",
1099 _PATH_SSH_SYSTEM_RC);
1100 } else if (do_xauth && options.xauth_location != NULL) {
1101 /* Add authority data to .Xauthority if appropriate. */
1104 "Running %.500s add "
1105 "%.100s %.100s %.100s\n",
1106 options.xauth_location, s->auth_display,
1107 s->auth_proto, s->auth_data);
1109 snprintf(cmd, sizeof cmd, "%s -q -",
1110 options.xauth_location);
1111 f = popen(cmd, "w");
1113 fprintf(f, "add %s %s %s\n",
1114 s->auth_display, s->auth_proto,
1118 fprintf(stderr, "Could not run %s\n",
1125 do_nologin(struct passwd *pw)
1130 #ifdef HAVE_LOGIN_CAP
1131 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
1132 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
1133 _PATH_NOLOGIN), "r");
1136 f = fopen(_PATH_NOLOGIN, "r");
1139 /* /etc/nologin exists. Print its contents and exit. */
1140 while (fgets(buf, sizeof(buf), f))
1147 /* Set login name, uid, gid, and groups. */
1149 do_setusercontext(struct passwd *pw)
1153 #else /* HAVE_CYGWIN */
1154 if (getuid() == 0 || geteuid() == 0) {
1155 #endif /* HAVE_CYGWIN */
1156 #ifdef HAVE_GETUSERATTR
1157 set_limits_from_userattr(pw->pw_name);
1158 #endif /* HAVE_GETUSERATTR */
1159 #ifdef HAVE_LOGIN_CAP
1160 if (setusercontext(lc, pw, pw->pw_uid,
1161 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1162 perror("unable to set user context");
1166 # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
1167 /* Sets login uid for accounting */
1168 if (getluid() == -1 && setluid(pw->pw_uid) == -1)
1169 error("setluid: %s", strerror(errno));
1170 # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
1172 if (setlogin(pw->pw_name) < 0)
1173 error("setlogin failed: %s", strerror(errno));
1174 if (setgid(pw->pw_gid) < 0) {
1178 /* Initialize the group list. */
1179 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1180 perror("initgroups");
1186 * PAM credentials may take the form of supplementary groups.
1187 * These will have been wiped by the above initgroups() call.
1188 * Reestablish them here.
1191 # endif /* USE_PAM */
1192 # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)
1193 irix_setusercontext(pw);
1194 # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
1195 /* Permanently switch to the desired uid. */
1196 permanently_set_uid(pw);
1199 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1200 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1204 launch_login(struct passwd *pw, const char *hostname)
1206 /* Launch login(1). */
1208 execl(LOGIN_PROGRAM, "login", "-h", hostname,
1209 #ifdef xxxLOGIN_NEEDS_TERM
1210 (s->term ? s->term : "unknown"),
1211 #endif /* LOGIN_NEEDS_TERM */
1212 #ifdef LOGIN_NO_ENDOPT
1213 "-p", "-f", pw->pw_name, (char *)NULL);
1215 "-p", "-f", "--", pw->pw_name, (char *)NULL);
1218 /* Login couldn't be executed, die. */
1225 * Performs common processing for the child, such as setting up the
1226 * environment, closing extra file descriptors, setting the user and group
1227 * ids, and executing the command or shell.
1230 do_child(Session *s, const char *command)
1232 extern char **environ;
1235 const char *shell, *shell0, *hostname = NULL;
1236 struct passwd *pw = s->pw;
1239 /* remove hostkey from the child's memory */
1240 destroy_sensitive_data();
1242 /* login(1) is only called if we execute the login shell */
1243 if (options.use_login && command != NULL)
1244 options.use_login = 0;
1247 * Login(1) does this as well, and it needs uid 0 for the "-h"
1248 * switch, so we let login(1) to this for us.
1250 if (!options.use_login) {
1252 session_setup_sia(pw->pw_name, s->ttyfd == -1 ? NULL : s->tty);
1253 if (!check_quietlogin(s, command))
1255 #else /* HAVE_OSF_SIA */
1258 aix_usrinfo(pw, s->tty, s->ttyfd);
1260 do_setusercontext(pw);
1261 #endif /* HAVE_OSF_SIA */
1265 * Get the shell from the password data. An empty shell field is
1266 * legal, and means /bin/sh.
1268 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1269 #ifdef HAVE_LOGIN_CAP
1270 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1273 env = do_setup_env(s, shell);
1275 /* we have to stash the hostname before we close our socket. */
1276 if (options.use_login)
1277 hostname = get_remote_name_or_ip(utmp_len,
1278 options.verify_reverse_mapping);
1280 * Close the connection descriptors; note that this is the child, and
1281 * the server will still have the socket open, and it is important
1282 * that we do not shutdown it. Note that the descriptors cannot be
1283 * closed before building the environment, as we call
1284 * get_remote_ipaddr there.
1286 if (packet_get_connection_in() == packet_get_connection_out())
1287 close(packet_get_connection_in());
1289 close(packet_get_connection_in());
1290 close(packet_get_connection_out());
1293 * Close all descriptors related to channels. They will still remain
1294 * open in the parent.
1296 /* XXX better use close-on-exec? -markus */
1297 channel_close_all();
1300 * Close any extra file descriptors. Note that there may still be
1301 * descriptors left by system functions. They will be closed later.
1306 * Close any extra open file descriptors so that we don\'t have them
1307 * hanging around in clients. Note that we want to do this after
1308 * initgroups, because at least on Solaris 2.3 it leaves file
1311 for (i = 3; i < 64; i++)
1315 * Must take new environment into use so that .ssh/rc,
1316 * /etc/ssh/sshrc and xauth are run in the proper environment.
1321 /* Try to get AFS tokens for the local cell. */
1325 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1326 krb_afslog(cell, 0);
1332 /* Change current directory to the user\'s home directory. */
1333 if (chdir(pw->pw_dir) < 0) {
1334 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1335 pw->pw_dir, strerror(errno));
1336 #ifdef HAVE_LOGIN_CAP
1337 if (login_getcapbool(lc, "requirehome", 0))
1342 if (!options.use_login)
1343 do_rc_files(s, shell);
1345 /* restore SIGPIPE for child */
1346 signal(SIGPIPE, SIG_DFL);
1348 if (options.use_login) {
1349 launch_login(pw, hostname);
1353 /* Get the last component of the shell name. */
1354 if ((shell0 = strrchr(shell, '/')) != NULL)
1360 * If we have no command, execute the shell. In this case, the shell
1361 * name to be passed in argv[0] is preceded by '-' to indicate that
1362 * this is a login shell.
1367 /* Start the shell. Set initial character to '-'. */
1370 if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1371 >= sizeof(argv0) - 1) {
1377 /* Execute the shell. */
1380 execve(shell, argv, env);
1382 /* Executing the shell failed. */
1387 * Execute the command using the user's shell. This uses the -c
1388 * option to execute the command.
1390 argv[0] = (char *) shell0;
1392 argv[2] = (char *) command;
1394 execve(shell, argv, env);
1403 static int did_init = 0;
1405 debug("session_new: init");
1406 for (i = 0; i < MAX_SESSIONS; i++) {
1407 sessions[i].used = 0;
1411 for (i = 0; i < MAX_SESSIONS; i++) {
1412 Session *s = &sessions[i];
1414 memset(s, 0, sizeof(*s));
1420 debug("session_new: session %d", i);
1431 for (i = 0; i < MAX_SESSIONS; i++) {
1432 Session *s = &sessions[i];
1433 debug("dump: used %d session %d %p channel %d pid %d",
1443 session_open(Authctxt *authctxt, int chanid)
1445 Session *s = session_new();
1446 debug("session_open: channel %d", chanid);
1448 error("no more sessions");
1451 s->authctxt = authctxt;
1452 s->pw = authctxt->pw;
1454 fatal("no user for session %d", s->self);
1455 debug("session_open: session %d: link with channel %d", s->self, chanid);
1461 session_by_tty(char *tty)
1464 for (i = 0; i < MAX_SESSIONS; i++) {
1465 Session *s = &sessions[i];
1466 if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1467 debug("session_by_tty: session %d tty %s", i, tty);
1471 debug("session_by_tty: unknown tty %.100s", tty);
1477 session_by_channel(int id)
1480 for (i = 0; i < MAX_SESSIONS; i++) {
1481 Session *s = &sessions[i];
1482 if (s->used && s->chanid == id) {
1483 debug("session_by_channel: session %d channel %d", i, id);
1487 debug("session_by_channel: unknown channel %d", id);
1493 session_by_pid(pid_t pid)
1496 debug("session_by_pid: pid %d", pid);
1497 for (i = 0; i < MAX_SESSIONS; i++) {
1498 Session *s = &sessions[i];
1499 if (s->used && s->pid == pid)
1502 error("session_by_pid: unknown pid %d", pid);
1508 session_window_change_req(Session *s)
1510 s->col = packet_get_int();
1511 s->row = packet_get_int();
1512 s->xpixel = packet_get_int();
1513 s->ypixel = packet_get_int();
1515 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1520 session_pty_req(Session *s)
1526 debug("Allocating a pty not permitted for this authentication.");
1529 if (s->ttyfd != -1) {
1530 packet_disconnect("Protocol error: you already have a pty.");
1533 /* Get the time and hostname when the user last logged in. */
1534 if (options.print_lastlog) {
1535 s->hostname[0] = '\0';
1536 s->last_login_time = get_last_login_time(s->pw->pw_uid,
1537 s->pw->pw_name, s->hostname, sizeof(s->hostname));
1540 s->term = packet_get_string(&len);
1543 s->col = packet_get_int();
1544 s->row = packet_get_int();
1546 s->row = packet_get_int();
1547 s->col = packet_get_int();
1549 s->xpixel = packet_get_int();
1550 s->ypixel = packet_get_int();
1552 if (strcmp(s->term, "") == 0) {
1557 /* Allocate a pty and open it. */
1558 debug("Allocating pty.");
1559 if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) {
1565 error("session_pty_req: session %d alloc failed", s->self);
1568 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1570 /* for SSH1 the tty modes length is not given */
1572 n_bytes = packet_remaining();
1573 tty_parse_modes(s->ttyfd, &n_bytes);
1576 * Add a cleanup function to clear the utmp entry and record logout
1577 * time in case we call fatal() (e.g., the connection gets closed).
1579 fatal_add_cleanup(session_pty_cleanup, (void *)s);
1581 pty_setowner(s->pw, s->tty);
1583 /* Set window size from the packet. */
1584 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1587 session_proctitle(s);
1592 session_subsystem_req(Session *s)
1597 char *cmd, *subsys = packet_get_string(&len);
1601 log("subsystem request for %.100s", subsys);
1603 for (i = 0; i < options.num_subsystems; i++) {
1604 if (strcmp(subsys, options.subsystem_name[i]) == 0) {
1605 cmd = options.subsystem_command[i];
1606 if (stat(cmd, &st) < 0) {
1607 error("subsystem: cannot stat %s: %s", cmd,
1611 debug("subsystem: exec() %s", cmd);
1612 s->is_subsystem = 1;
1620 log("subsystem request for %.100s failed, subsystem not found",
1628 session_x11_req(Session *s)
1632 s->single_connection = packet_get_char();
1633 s->auth_proto = packet_get_string(NULL);
1634 s->auth_data = packet_get_string(NULL);
1635 s->screen = packet_get_int();
1638 success = session_setup_x11fwd(s);
1640 xfree(s->auth_proto);
1641 xfree(s->auth_data);
1642 s->auth_proto = NULL;
1643 s->auth_data = NULL;
1649 session_shell_req(Session *s)
1657 session_exec_req(Session *s)
1660 char *command = packet_get_string(&len);
1662 do_exec(s, command);
1668 session_auth_agent_req(Session *s)
1670 static int called = 0;
1672 if (no_agent_forwarding_flag) {
1673 debug("session_auth_agent_req: no_agent_forwarding_flag");
1680 return auth_input_request_forwarding(s->pw);
1685 session_input_channel_req(Channel *c, const char *rtype)
1690 if ((s = session_by_channel(c->self)) == NULL) {
1691 log("session_input_channel_req: no session %d req %.100s",
1695 debug("session_input_channel_req: session %d req %s", s->self, rtype);
1698 * a session is in LARVAL state until a shell, a command
1699 * or a subsystem is executed
1701 if (c->type == SSH_CHANNEL_LARVAL) {
1702 if (strcmp(rtype, "shell") == 0) {
1703 success = session_shell_req(s);
1704 } else if (strcmp(rtype, "exec") == 0) {
1705 success = session_exec_req(s);
1706 } else if (strcmp(rtype, "pty-req") == 0) {
1707 success = session_pty_req(s);
1708 } else if (strcmp(rtype, "x11-req") == 0) {
1709 success = session_x11_req(s);
1710 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1711 success = session_auth_agent_req(s);
1712 } else if (strcmp(rtype, "subsystem") == 0) {
1713 success = session_subsystem_req(s);
1716 if (strcmp(rtype, "window-change") == 0) {
1717 success = session_window_change_req(s);
1723 session_set_fds(Session *s, int fdin, int fdout, int fderr)
1726 fatal("session_set_fds: called for proto != 2.0");
1728 * now that have a child and a pipe to the child,
1729 * we can activate our channel and register the fd's
1731 if (s->chanid == -1)
1732 fatal("no channel for session %d", s->self);
1733 channel_set_fds(s->chanid,
1735 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1737 CHAN_SES_WINDOW_DEFAULT);
1741 * Function to perform pty cleanup. Also called if we get aborted abnormally
1742 * (e.g., due to a dropped connection).
1745 session_pty_cleanup2(void *session)
1747 Session *s = session;
1750 error("session_pty_cleanup: no session");
1756 debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
1758 /* Record that the user has logged out. */
1760 record_logout(s->pid, s->tty, s->pw->pw_name);
1762 /* Release the pseudo-tty. */
1764 pty_release(s->tty);
1767 * Close the server side of the socket pairs. We must do this after
1768 * the pty cleanup, so that another process doesn't get this pty
1769 * while we're still cleaning up.
1771 if (close(s->ptymaster) < 0)
1772 error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
1774 /* unlink pty from session */
1779 session_pty_cleanup(void *session)
1781 PRIVSEP(session_pty_cleanup2(session));
1785 session_exit_message(Session *s, int status)
1789 if ((c = channel_lookup(s->chanid)) == NULL)
1790 fatal("session_exit_message: session %d: no channel %d",
1791 s->self, s->chanid);
1792 debug("session_exit_message: session %d channel %d pid %d",
1793 s->self, s->chanid, s->pid);
1795 if (WIFEXITED(status)) {
1796 channel_request_start(s->chanid, "exit-status", 0);
1797 packet_put_int(WEXITSTATUS(status));
1799 } else if (WIFSIGNALED(status)) {
1800 channel_request_start(s->chanid, "exit-signal", 0);
1801 packet_put_int(WTERMSIG(status));
1803 packet_put_char(WCOREDUMP(status));
1804 #else /* WCOREDUMP */
1806 #endif /* WCOREDUMP */
1807 packet_put_cstring("");
1808 packet_put_cstring("");
1811 /* Some weird exit cause. Just exit. */
1812 packet_disconnect("wait returned status %04x.", status);
1815 /* disconnect channel */
1816 debug("session_exit_message: release channel %d", s->chanid);
1817 channel_cancel_cleanup(s->chanid);
1819 * emulate a write failure with 'chan_write_failed', nobody will be
1820 * interested in data we write.
1821 * Note that we must not call 'chan_read_failed', since there could
1822 * be some more data waiting in the pipe.
1824 if (c->ostate != CHAN_OUTPUT_CLOSED)
1825 chan_write_failed(c);
1830 session_close(Session *s)
1832 debug("session_close: session %d pid %d", s->self, s->pid);
1833 if (s->ttyfd != -1) {
1834 fatal_remove_cleanup(session_pty_cleanup, (void *)s);
1835 session_pty_cleanup(s);
1841 if (s->auth_display)
1842 xfree(s->auth_display);
1844 xfree(s->auth_data);
1846 xfree(s->auth_proto);
1848 session_proctitle(s);
1852 session_close_by_pid(pid_t pid, int status)
1854 Session *s = session_by_pid(pid);
1856 debug("session_close_by_pid: no session for pid %d", pid);
1859 if (s->chanid != -1)
1860 session_exit_message(s, status);
1865 * this is called when a channel dies before
1866 * the session 'child' itself dies
1869 session_close_by_channel(int id, void *arg)
1871 Session *s = session_by_channel(id);
1873 debug("session_close_by_channel: no session for id %d", id);
1876 debug("session_close_by_channel: channel %d child %d", id, s->pid);
1878 debug("session_close_by_channel: channel %d: has child", id);
1880 * delay detach of session, but release pty, since
1881 * the fd's to the child are already closed
1883 if (s->ttyfd != -1) {
1884 fatal_remove_cleanup(session_pty_cleanup, (void *)s);
1885 session_pty_cleanup(s);
1889 /* detach by removing callback */
1890 channel_cancel_cleanup(s->chanid);
1896 session_destroy_all(void (*closefunc)(Session *))
1899 for (i = 0; i < MAX_SESSIONS; i++) {
1900 Session *s = &sessions[i];
1902 if (closefunc != NULL)
1911 session_tty_list(void)
1913 static char buf[1024];
1916 for (i = 0; i < MAX_SESSIONS; i++) {
1917 Session *s = &sessions[i];
1918 if (s->used && s->ttyfd != -1) {
1920 strlcat(buf, ",", sizeof buf);
1921 strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
1925 strlcpy(buf, "notty", sizeof buf);
1930 session_proctitle(Session *s)
1933 error("no user for session %d", s->self);
1935 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1939 session_setup_x11fwd(Session *s)
1942 char display[512], auth_display[512];
1943 char hostname[MAXHOSTNAMELEN];
1945 if (no_x11_forwarding_flag) {
1946 packet_send_debug("X11 forwarding disabled in user configuration file.");
1949 if (!options.x11_forwarding) {
1950 debug("X11 forwarding disabled in server configuration file.");
1953 if (!options.xauth_location ||
1954 (stat(options.xauth_location, &st) == -1)) {
1955 packet_send_debug("No xauth program; cannot forward with spoofing.");
1958 if (options.use_login) {
1959 packet_send_debug("X11 forwarding disabled; "
1960 "not compatible with UseLogin=yes.");
1963 if (s->display != NULL) {
1964 debug("X11 display already set.");
1967 s->display_number = x11_create_display_inet(options.x11_display_offset,
1968 options.x11_use_localhost, s->single_connection);
1969 if (s->display_number == -1) {
1970 debug("x11_create_display_inet failed.");
1974 /* Set up a suitable value for the DISPLAY variable. */
1975 if (gethostname(hostname, sizeof(hostname)) < 0)
1976 fatal("gethostname: %.100s", strerror(errno));
1978 * auth_display must be used as the displayname when the
1979 * authorization entry is added with xauth(1). This will be
1980 * different than the DISPLAY string for localhost displays.
1982 if (options.x11_use_localhost) {
1983 snprintf(display, sizeof display, "localhost:%d.%d",
1984 s->display_number, s->screen);
1985 snprintf(auth_display, sizeof auth_display, "unix:%d.%d",
1986 s->display_number, s->screen);
1987 s->display = xstrdup(display);
1988 s->auth_display = xstrdup(auth_display);
1990 #ifdef IPADDR_IN_DISPLAY
1992 struct in_addr my_addr;
1994 he = gethostbyname(hostname);
1996 error("Can't get IP address for X11 DISPLAY.");
1997 packet_send_debug("Can't get IP address for X11 DISPLAY.");
2000 memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
2001 snprintf(display, sizeof display, "%.50s:%d.%d", inet_ntoa(my_addr),
2002 s->display_number, s->screen);
2004 snprintf(display, sizeof display, "%.400s:%d.%d", hostname,
2005 s->display_number, s->screen);
2007 s->display = xstrdup(display);
2008 s->auth_display = xstrdup(display);
2015 do_authenticated2(Authctxt *authctxt)
2017 server_loop2(authctxt);