Annotation of src/usr.bin/ssh/session.c, Revision 1.163.2.2
1.1 markus 1: /*
2: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
3: * All rights reserved
1.37 deraadt 4: *
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".
10: *
1.2 markus 11: * SSH2 support by Markus Friedl.
1.95 markus 12: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
1.37 deraadt 13: *
14: * Redistribution and use in source and binary forms, with or without
15: * modification, are permitted provided that the following conditions
16: * are met:
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.
22: *
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.
1.2 markus 33: */
1.1 markus 34:
35: #include "includes.h"
1.163.2.2! brad 36: RCSID("$OpenBSD: session.c,v 1.180 2004/07/28 09:40:29 markus Exp $");
1.1 markus 37:
1.51 markus 38: #include "ssh.h"
39: #include "ssh1.h"
40: #include "ssh2.h"
1.1 markus 41: #include "xmalloc.h"
1.59 djm 42: #include "sshpty.h"
1.1 markus 43: #include "packet.h"
44: #include "buffer.h"
1.163.2.2! brad 45: #include "match.h"
1.1 markus 46: #include "uidswap.h"
47: #include "compat.h"
1.78 markus 48: #include "channels.h"
1.2 markus 49: #include "bufaux.h"
50: #include "auth.h"
1.19 markus 51: #include "auth-options.h"
1.50 markus 52: #include "pathnames.h"
1.51 markus 53: #include "log.h"
54: #include "servconf.h"
1.59 djm 55: #include "sshlogin.h"
1.51 markus 56: #include "serverloop.h"
57: #include "canohost.h"
1.55 itojun 58: #include "session.h"
1.130 provos 59: #include "monitor_wrap.h"
1.1 markus 60:
1.163.2.1 brad 61: #ifdef KRB5
62: #include <kafs.h>
63: #endif
64:
1.161 markus 65: #ifdef GSSAPI
66: #include "ssh-gss.h"
67: #endif
68:
1.1 markus 69: /* func */
70:
71: Session *session_new(void);
1.94 itojun 72: void session_set_fds(Session *, int, int, int);
1.163.2.1 brad 73: void session_pty_cleanup(Session *);
1.94 itojun 74: void session_proctitle(Session *);
75: int session_setup_x11fwd(Session *);
76: void do_exec_pty(Session *, const char *);
77: void do_exec_no_pty(Session *, const char *);
78: void do_exec(Session *, const char *);
79: void do_login(Session *, const char *);
80: void do_child(Session *, const char *);
1.73 djm 81: void do_motd(void);
1.94 itojun 82: int check_quietlogin(Session *, const char *);
1.1 markus 83:
1.94 itojun 84: static void do_authenticated1(Authctxt *);
85: static void do_authenticated2(Authctxt *);
86:
87: static int session_pty_req(Session *);
1.65 markus 88:
1.1 markus 89: /* import */
90: extern ServerOptions options;
91: extern char *__progname;
92: extern int log_stderr;
93: extern int debug_flag;
1.45 markus 94: extern u_int utmp_len;
1.21 markus 95: extern int startup_pipe;
1.74 markus 96: extern void destroy_sensitive_data(void);
1.163.2.2! brad 97: extern Buffer loginmsg;
1.21 markus 98:
1.34 markus 99: /* original command from peer. */
1.92 markus 100: const char *original_command = NULL;
1.34 markus 101:
1.1 markus 102: /* data */
103: #define MAX_SESSIONS 10
104: Session sessions[MAX_SESSIONS];
105:
1.28 millert 106: #ifdef HAVE_LOGIN_CAP
1.129 provos 107: login_cap_t *lc;
1.28 millert 108: #endif
109:
1.163.2.1 brad 110: static int is_child = 0;
111:
1.136 markus 112: /* Name and directory of socket for authentication agent forwarding. */
113: static char *auth_sock_name = NULL;
114: static char *auth_sock_dir = NULL;
115:
116: /* removes the agent forwarding socket */
117:
118: static void
1.163.2.1 brad 119: auth_sock_cleanup_proc(struct passwd *pw)
1.136 markus 120: {
121: if (auth_sock_name != NULL) {
122: temporarily_use_uid(pw);
123: unlink(auth_sock_name);
124: rmdir(auth_sock_dir);
125: auth_sock_name = NULL;
126: restore_uid();
127: }
128: }
129:
130: static int
131: auth_input_request_forwarding(struct passwd * pw)
132: {
133: Channel *nc;
134: int sock;
135: struct sockaddr_un sunaddr;
136:
137: if (auth_sock_name != NULL) {
138: error("authentication forwarding requested twice.");
139: return 0;
140: }
141:
142: /* Temporarily drop privileged uid for mkdir/bind. */
143: temporarily_use_uid(pw);
144:
145: /* Allocate a buffer for the socket name, and format the name. */
146: auth_sock_name = xmalloc(MAXPATHLEN);
147: auth_sock_dir = xmalloc(MAXPATHLEN);
1.163.2.1 brad 148: strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
1.136 markus 149:
150: /* Create private directory for socket */
151: if (mkdtemp(auth_sock_dir) == NULL) {
152: packet_send_debug("Agent forwarding disabled: "
153: "mkdtemp() failed: %.100s", strerror(errno));
154: restore_uid();
155: xfree(auth_sock_name);
156: xfree(auth_sock_dir);
157: auth_sock_name = NULL;
158: auth_sock_dir = NULL;
159: return 0;
160: }
1.137 mpech 161: snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld",
162: auth_sock_dir, (long) getpid());
1.136 markus 163:
164: /* Create the socket. */
165: sock = socket(AF_UNIX, SOCK_STREAM, 0);
166: if (sock < 0)
167: packet_disconnect("socket: %.100s", strerror(errno));
168:
169: /* Bind it to the name. */
170: memset(&sunaddr, 0, sizeof(sunaddr));
171: sunaddr.sun_family = AF_UNIX;
172: strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path));
173:
174: if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
175: packet_disconnect("bind: %.100s", strerror(errno));
176:
177: /* Restore the privileged uid. */
178: restore_uid();
179:
180: /* Start listening on the socket. */
1.163.2.1 brad 181: if (listen(sock, SSH_LISTEN_BACKLOG) < 0)
1.136 markus 182: packet_disconnect("listen: %.100s", strerror(errno));
183:
184: /* Allocate a channel for the authentication agent socket. */
185: nc = channel_new("auth socket",
186: SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
187: CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
1.156 markus 188: 0, "auth socket", 1);
1.136 markus 189: strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
190: return 1;
191: }
192:
1.163.2.2! brad 193: static void
! 194: display_loginmsg(void)
! 195: {
! 196: if (buffer_len(&loginmsg) > 0) {
! 197: buffer_append(&loginmsg, "\0", 1);
! 198: printf("%s", (char *)buffer_ptr(&loginmsg));
! 199: buffer_clear(&loginmsg);
! 200: }
! 201: }
1.136 markus 202:
1.65 markus 203: void
204: do_authenticated(Authctxt *authctxt)
205: {
1.153 markus 206: setproctitle("%s", authctxt->pw->pw_name);
207:
1.65 markus 208: /*
209: * Cancel the alarm we set to limit the time taken for
210: * authentication.
211: */
212: alarm(0);
213: if (startup_pipe != -1) {
214: close(startup_pipe);
215: startup_pipe = -1;
216: }
217: /* setup the channel layer */
218: if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
219: channel_permit_all_opens();
220:
221: if (compat20)
222: do_authenticated2(authctxt);
223: else
224: do_authenticated1(authctxt);
1.79 markus 225:
1.163.2.1 brad 226: do_cleanup(authctxt);
1.65 markus 227: }
228:
1.1 markus 229: /*
230: * Prepares for an interactive session. This is called after the user has
231: * been successfully authenticated. During this message exchange, pseudo
232: * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
233: * are requested, etc.
234: */
1.94 itojun 235: static void
1.65 markus 236: do_authenticated1(Authctxt *authctxt)
1.1 markus 237: {
238: Session *s;
1.65 markus 239: char *command;
1.117 markus 240: int success, type, screen_flag;
1.139 deraadt 241: int enable_compression_after_reply = 0;
242: u_int proto_len, data_len, dlen, compression_level = 0;
1.1 markus 243:
1.61 markus 244: s = session_new();
1.96 dugsong 245: s->authctxt = authctxt;
1.65 markus 246: s->pw = authctxt->pw;
1.28 millert 247:
1.1 markus 248: /*
249: * We stay in this loop until the client requests to execute a shell
250: * or a command.
251: */
252: for (;;) {
1.65 markus 253: success = 0;
1.1 markus 254:
255: /* Get a packet from the client. */
1.117 markus 256: type = packet_read();
1.1 markus 257:
258: /* Process the packet. */
259: switch (type) {
260: case SSH_CMSG_REQUEST_COMPRESSION:
261: compression_level = packet_get_int();
1.116 markus 262: packet_check_eom();
1.1 markus 263: if (compression_level < 1 || compression_level > 9) {
1.163.2.2! brad 264: packet_send_debug("Received invalid compression level %d.",
1.112 deraadt 265: compression_level);
1.138 markus 266: break;
267: }
268: if (!options.compression) {
269: debug2("compression disabled");
1.1 markus 270: break;
271: }
272: /* Enable compression after we have responded with SUCCESS. */
273: enable_compression_after_reply = 1;
274: success = 1;
275: break;
276:
277: case SSH_CMSG_REQUEST_PTY:
1.86 markus 278: success = session_pty_req(s);
1.1 markus 279: break;
280:
281: case SSH_CMSG_X11_REQUEST_FORWARDING:
282: s->auth_proto = packet_get_string(&proto_len);
283: s->auth_data = packet_get_string(&data_len);
284:
1.57 markus 285: screen_flag = packet_get_protocol_flags() &
286: SSH_PROTOFLAG_SCREEN_NUMBER;
287: debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
288:
289: if (packet_remaining() == 4) {
290: if (!screen_flag)
291: debug2("Buggy client: "
292: "X11 screen flag missing");
1.1 markus 293: s->screen = packet_get_int();
1.56 markus 294: } else {
1.1 markus 295: s->screen = 0;
1.56 markus 296: }
1.116 markus 297: packet_check_eom();
1.81 markus 298: success = session_setup_x11fwd(s);
299: if (!success) {
300: xfree(s->auth_proto);
301: xfree(s->auth_data);
1.84 markus 302: s->auth_proto = NULL;
303: s->auth_data = NULL;
1.1 markus 304: }
305: break;
306:
307: case SSH_CMSG_AGENT_REQUEST_FORWARDING:
308: if (no_agent_forwarding_flag || compat13) {
309: debug("Authentication agent forwarding not permitted for this authentication.");
310: break;
311: }
312: debug("Received authentication agent forwarding request.");
1.65 markus 313: success = auth_input_request_forwarding(s->pw);
1.1 markus 314: break;
315:
316: case SSH_CMSG_PORT_FORWARD_REQUEST:
317: if (no_port_forwarding_flag) {
318: debug("Port forwarding not permitted for this authentication.");
1.39 markus 319: break;
320: }
321: if (!options.allow_tcp_forwarding) {
322: debug("Port forwarding not permitted.");
1.1 markus 323: break;
324: }
325: debug("Received TCP/IP port forwarding request.");
1.65 markus 326: channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
1.1 markus 327: success = 1;
328: break;
329:
330: case SSH_CMSG_MAX_PACKET_SIZE:
331: if (packet_set_maxsize(packet_get_int()) > 0)
332: success = 1;
333: break;
334:
335: case SSH_CMSG_EXEC_SHELL:
336: case SSH_CMSG_EXEC_CMD:
337: if (type == SSH_CMSG_EXEC_CMD) {
338: command = packet_get_string(&dlen);
339: debug("Exec command '%.500s'", command);
1.92 markus 340: do_exec(s, command);
341: xfree(command);
1.1 markus 342: } else {
1.92 markus 343: do_exec(s, NULL);
1.1 markus 344: }
1.116 markus 345: packet_check_eom();
1.82 markus 346: session_close(s);
1.1 markus 347: return;
348:
349: default:
350: /*
351: * Any unknown messages in this phase are ignored,
352: * and a failure message is returned.
353: */
1.155 itojun 354: logit("Unknown packet type received after authentication: %d", type);
1.1 markus 355: }
356: packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
357: packet_send();
358: packet_write_wait();
359:
360: /* Enable compression now that we have replied if appropriate. */
361: if (enable_compression_after_reply) {
362: enable_compression_after_reply = 0;
363: packet_start_compression(compression_level);
364: }
365: }
366: }
367:
368: /*
369: * This is called to fork and execute a command when we have no tty. This
370: * will call do_child from the child, and server_loop from the parent after
371: * setting up file descriptors and such.
372: */
1.4 markus 373: void
1.63 markus 374: do_exec_no_pty(Session *s, const char *command)
1.1 markus 375: {
1.137 mpech 376: pid_t pid;
1.1 markus 377:
378: #ifdef USE_PIPES
379: int pin[2], pout[2], perr[2];
380: /* Allocate pipes for communicating with the program. */
381: if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
382: packet_disconnect("Could not create pipes: %.100s",
383: strerror(errno));
384: #else /* USE_PIPES */
385: int inout[2], err[2];
386: /* Uses socket pairs to communicate with the program. */
387: if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
388: socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
389: packet_disconnect("Could not create socket pairs: %.100s",
390: strerror(errno));
391: #endif /* USE_PIPES */
392: if (s == NULL)
393: fatal("do_exec_no_pty: no session");
394:
1.9 markus 395: session_proctitle(s);
1.1 markus 396:
397: /* Fork the child. */
398: if ((pid = fork()) == 0) {
1.163.2.1 brad 399: is_child = 1;
1.144 markus 400:
1.1 markus 401: /* Child. Reinitialize the log since the pid has changed. */
402: log_init(__progname, options.log_level, options.log_facility, log_stderr);
403:
404: /*
405: * Create a new session and process group since the 4.4BSD
406: * setlogin() affects the entire process group.
407: */
408: if (setsid() < 0)
409: error("setsid failed: %.100s", strerror(errno));
410:
411: #ifdef USE_PIPES
412: /*
413: * Redirect stdin. We close the parent side of the socket
414: * pair, and make the child side the standard input.
415: */
416: close(pin[1]);
417: if (dup2(pin[0], 0) < 0)
418: perror("dup2 stdin");
419: close(pin[0]);
420:
421: /* Redirect stdout. */
422: close(pout[0]);
423: if (dup2(pout[1], 1) < 0)
424: perror("dup2 stdout");
425: close(pout[1]);
426:
427: /* Redirect stderr. */
428: close(perr[0]);
429: if (dup2(perr[1], 2) < 0)
430: perror("dup2 stderr");
431: close(perr[1]);
432: #else /* USE_PIPES */
433: /*
434: * Redirect stdin, stdout, and stderr. Stdin and stdout will
435: * use the same socket, as some programs (particularly rdist)
436: * seem to depend on it.
437: */
438: close(inout[1]);
439: close(err[1]);
440: if (dup2(inout[0], 0) < 0) /* stdin */
441: perror("dup2 stdin");
442: if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
443: perror("dup2 stdout");
444: if (dup2(err[0], 2) < 0) /* stderr */
445: perror("dup2 stderr");
446: #endif /* USE_PIPES */
447:
448: /* Do processing for the child (exec command etc). */
1.60 markus 449: do_child(s, command);
1.1 markus 450: /* NOTREACHED */
451: }
452: if (pid < 0)
453: packet_disconnect("fork failed: %.100s", strerror(errno));
454: s->pid = pid;
1.47 markus 455: /* Set interactive/non-interactive mode. */
1.48 markus 456: packet_set_interactive(s->display != NULL);
1.1 markus 457: #ifdef USE_PIPES
458: /* We are the parent. Close the child sides of the pipes. */
459: close(pin[0]);
460: close(pout[1]);
461: close(perr[1]);
462:
1.2 markus 463: if (compat20) {
1.163.2.2! brad 464: if (s->is_subsystem) {
! 465: close(perr[0]);
! 466: perr[0] = -1;
! 467: }
! 468: session_set_fds(s, pin[1], pout[0], perr[0]);
1.2 markus 469: } else {
470: /* Enter the interactive session. */
471: server_loop(pid, pin[1], pout[0], perr[0]);
1.64 markus 472: /* server_loop has closed pin[1], pout[0], and perr[0]. */
1.2 markus 473: }
1.1 markus 474: #else /* USE_PIPES */
475: /* We are the parent. Close the child sides of the socket pairs. */
476: close(inout[0]);
477: close(err[0]);
478:
479: /*
480: * Enter the interactive session. Note: server_loop must be able to
481: * handle the case that fdin and fdout are the same.
482: */
1.2 markus 483: if (compat20) {
1.64 markus 484: session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
1.2 markus 485: } else {
486: server_loop(pid, inout[1], inout[1], err[1]);
487: /* server_loop has closed inout[1] and err[1]. */
488: }
1.1 markus 489: #endif /* USE_PIPES */
490: }
491:
492: /*
493: * This is called to fork and execute a command when we have a tty. This
494: * will call do_child from the child, and server_loop from the parent after
495: * setting up file descriptors, controlling tty, updating wtmp, utmp,
496: * lastlog, and other such operations.
497: */
1.4 markus 498: void
1.63 markus 499: do_exec_pty(Session *s, const char *command)
1.1 markus 500: {
501: int fdout, ptyfd, ttyfd, ptymaster;
502: pid_t pid;
503:
504: if (s == NULL)
505: fatal("do_exec_pty: no session");
506: ptyfd = s->ptyfd;
507: ttyfd = s->ttyfd;
508:
509: /* Fork the child. */
510: if ((pid = fork()) == 0) {
1.163.2.1 brad 511: is_child = 1;
1.97 markus 512:
1.24 markus 513: /* Child. Reinitialize the log because the pid has changed. */
1.1 markus 514: log_init(__progname, options.log_level, options.log_facility, log_stderr);
515: /* Close the master side of the pseudo tty. */
516: close(ptyfd);
517:
518: /* Make the pseudo tty our controlling tty. */
519: pty_make_controlling_tty(&ttyfd, s->tty);
520:
1.103 markus 521: /* Redirect stdin/stdout/stderr from the pseudo tty. */
522: if (dup2(ttyfd, 0) < 0)
523: error("dup2 stdin: %s", strerror(errno));
524: if (dup2(ttyfd, 1) < 0)
525: error("dup2 stdout: %s", strerror(errno));
526: if (dup2(ttyfd, 2) < 0)
527: error("dup2 stderr: %s", strerror(errno));
1.1 markus 528:
529: /* Close the extra descriptor for the pseudo tty. */
530: close(ttyfd);
531:
1.24 markus 532: /* record login, etc. similar to login(1) */
1.41 markus 533: if (!(options.use_login && command == NULL))
534: do_login(s, command);
1.1 markus 535:
536: /* Do common processing for the child, such as execing the command. */
1.60 markus 537: do_child(s, command);
1.1 markus 538: /* NOTREACHED */
539: }
540: if (pid < 0)
541: packet_disconnect("fork failed: %.100s", strerror(errno));
542: s->pid = pid;
543:
544: /* Parent. Close the slave side of the pseudo tty. */
545: close(ttyfd);
546:
547: /*
548: * Create another descriptor of the pty master side for use as the
549: * standard input. We could use the original descriptor, but this
550: * simplifies code in server_loop. The descriptor is bidirectional.
551: */
552: fdout = dup(ptyfd);
553: if (fdout < 0)
554: packet_disconnect("dup #1 failed: %.100s", strerror(errno));
555:
556: /* we keep a reference to the pty master */
557: ptymaster = dup(ptyfd);
558: if (ptymaster < 0)
559: packet_disconnect("dup #2 failed: %.100s", strerror(errno));
560: s->ptymaster = ptymaster;
561:
562: /* Enter interactive session. */
1.47 markus 563: packet_set_interactive(1);
1.2 markus 564: if (compat20) {
565: session_set_fds(s, ptyfd, fdout, -1);
566: } else {
567: server_loop(pid, ptyfd, fdout, -1);
568: /* server_loop _has_ closed ptyfd and fdout. */
1.24 markus 569: }
570: }
571:
1.90 markus 572: /*
573: * This is called to fork and execute a command. If another command is
574: * to be forced, execute that instead.
575: */
576: void
577: do_exec(Session *s, const char *command)
578: {
579: if (forced_command) {
580: original_command = command;
581: command = forced_command;
582: debug("Forced command '%.900s'", command);
583: }
1.163 markus 584:
585: #ifdef GSSAPI
586: if (options.gss_authentication) {
587: temporarily_use_uid(s->pw);
588: ssh_gssapi_storecreds();
589: restore_uid();
590: }
591: #endif
1.90 markus 592:
593: if (s->ttyfd != -1)
594: do_exec_pty(s, command);
595: else
596: do_exec_no_pty(s, command);
597:
1.92 markus 598: original_command = NULL;
1.163.2.2! brad 599:
! 600: /*
! 601: * Clear loginmsg: it's the child's responsibility to display
! 602: * it to the user, otherwise multiple sessions may accumulate
! 603: * multiple copies of the login messages.
! 604: */
! 605: buffer_clear(&loginmsg);
1.90 markus 606: }
607:
608:
1.24 markus 609: /* administrative, login(1)-like work */
610: void
1.41 markus 611: do_login(Session *s, const char *command)
1.24 markus 612: {
613: socklen_t fromlen;
614: struct sockaddr_storage from;
615: struct passwd * pw = s->pw;
616: pid_t pid = getpid();
617:
618: /*
619: * Get IP address of client. If the connection is not a socket, let
620: * the address be 0.0.0.0.
621: */
622: memset(&from, 0, sizeof(from));
1.148 stevesk 623: fromlen = sizeof(from);
1.24 markus 624: if (packet_connection_is_on_socket()) {
625: if (getpeername(packet_get_connection_in(),
1.112 deraadt 626: (struct sockaddr *) & from, &fromlen) < 0) {
1.24 markus 627: debug("getpeername: %.100s", strerror(errno));
1.163.2.1 brad 628: cleanup_exit(255);
1.24 markus 629: }
630: }
1.25 markus 631:
1.24 markus 632: /* Record that there was a login on that tty from the remote host. */
1.133 markus 633: if (!use_privsep)
634: record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
635: get_remote_name_or_ip(utmp_len,
1.158 markus 636: options.use_dns),
1.148 stevesk 637: (struct sockaddr *)&from, fromlen);
1.24 markus 638:
1.73 djm 639: if (check_quietlogin(s, command))
1.24 markus 640: return;
1.73 djm 641:
1.163.2.2! brad 642: display_loginmsg();
1.73 djm 643:
644: do_motd();
645: }
646:
647: /*
648: * Display the message of the day.
649: */
650: void
651: do_motd(void)
652: {
653: FILE *f;
654: char buf[256];
655:
1.24 markus 656: if (options.print_motd) {
1.28 millert 657: #ifdef HAVE_LOGIN_CAP
658: f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
659: "/etc/motd"), "r");
660: #else
1.24 markus 661: f = fopen("/etc/motd", "r");
1.28 millert 662: #endif
1.24 markus 663: if (f) {
664: while (fgets(buf, sizeof(buf), f))
665: fputs(buf, stdout);
666: fclose(f);
667: }
1.2 markus 668: }
1.73 djm 669: }
670:
671:
672: /*
673: * Check for quiet login, either .hushlogin or command given.
674: */
675: int
676: check_quietlogin(Session *s, const char *command)
677: {
678: char buf[256];
1.96 dugsong 679: struct passwd *pw = s->pw;
1.73 djm 680: struct stat st;
681:
682: /* Return 1 if .hushlogin exists or a command given. */
683: if (command != NULL)
684: return 1;
685: snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
686: #ifdef HAVE_LOGIN_CAP
687: if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
688: return 1;
689: #else
690: if (stat(buf, &st) >= 0)
691: return 1;
692: #endif
693: return 0;
1.1 markus 694: }
695:
696: /*
697: * Sets the value of the given variable in the environment. If the variable
698: * already exists, its value is overriden.
699: */
1.161 markus 700: void
1.45 markus 701: child_set_env(char ***envp, u_int *envsizep, const char *name,
1.112 deraadt 702: const char *value)
1.1 markus 703: {
704: char **env;
1.163.2.1 brad 705: u_int envsize;
706: u_int i, namelen;
1.1 markus 707:
708: /*
709: * Find the slot where the value should be stored. If the variable
710: * already exists, we reuse the slot; otherwise we append a new slot
711: * at the end of the array, expanding if necessary.
712: */
713: env = *envp;
714: namelen = strlen(name);
715: for (i = 0; env[i]; i++)
716: if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
717: break;
718: if (env[i]) {
719: /* Reuse the slot. */
720: xfree(env[i]);
721: } else {
722: /* New variable. Expand if necessary. */
1.163.2.1 brad 723: envsize = *envsizep;
724: if (i >= envsize - 1) {
725: if (envsize >= 1000)
726: fatal("child_set_env: too many env vars");
727: envsize += 50;
728: env = (*envp) = xrealloc(env, envsize * sizeof(char *));
729: *envsizep = envsize;
1.1 markus 730: }
731: /* Need to set the NULL pointer at end of array beyond the new slot. */
732: env[i + 1] = NULL;
733: }
734:
735: /* Allocate space and format the variable in the appropriate slot. */
736: env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
737: snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
738: }
739:
740: /*
741: * Reads environment variables from the given file and adds/overrides them
742: * into the environment. If the file does not exist, this does nothing.
743: * Otherwise, it must consist of empty lines, comments (line starts with '#')
744: * and assignments of the form name=value. No other forms are allowed.
745: */
1.94 itojun 746: static void
1.45 markus 747: read_environment_file(char ***env, u_int *envsize,
1.112 deraadt 748: const char *filename)
1.1 markus 749: {
750: FILE *f;
751: char buf[4096];
752: char *cp, *value;
1.142 deraadt 753: u_int lineno = 0;
1.1 markus 754:
755: f = fopen(filename, "r");
756: if (!f)
757: return;
758:
759: while (fgets(buf, sizeof(buf), f)) {
1.142 deraadt 760: if (++lineno > 1000)
761: fatal("Too many lines in environment file %s", filename);
1.1 markus 762: for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
763: ;
764: if (!*cp || *cp == '#' || *cp == '\n')
765: continue;
766: if (strchr(cp, '\n'))
767: *strchr(cp, '\n') = '\0';
768: value = strchr(cp, '=');
769: if (value == NULL) {
1.142 deraadt 770: fprintf(stderr, "Bad line %u in %.100s\n", lineno,
771: filename);
1.1 markus 772: continue;
773: }
1.14 deraadt 774: /*
775: * Replace the equals sign by nul, and advance value to
776: * the value string.
777: */
1.1 markus 778: *value = '\0';
779: value++;
780: child_set_env(env, envsize, cp, value);
781: }
782: fclose(f);
783: }
784:
1.127 markus 785: static char **
786: do_setup_env(Session *s, const char *shell)
1.1 markus 787: {
788: char buf[256];
1.127 markus 789: u_int i, envsize;
1.154 markus 790: char **env, *laddr;
1.127 markus 791: struct passwd *pw = s->pw;
1.1 markus 792:
793: /* Initialize the environment. */
794: envsize = 100;
795: env = xmalloc(envsize * sizeof(char *));
796: env[0] = NULL;
797:
1.161 markus 798: #ifdef GSSAPI
1.163.2.1 brad 799: /* Allow any GSSAPI methods that we've used to alter
1.161 markus 800: * the childs environment as they see fit
801: */
802: ssh_gssapi_do_child(&env, &envsize);
803: #endif
804:
1.1 markus 805: if (!options.use_login) {
806: /* Set basic environment. */
1.163.2.2! brad 807: for (i = 0; i < s->num_env; i++)
! 808: child_set_env(&env, &envsize, s->env[i].name,
! 809: s->env[i].val);
! 810:
1.1 markus 811: child_set_env(&env, &envsize, "USER", pw->pw_name);
812: child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
813: child_set_env(&env, &envsize, "HOME", pw->pw_dir);
1.28 millert 814: #ifdef HAVE_LOGIN_CAP
1.145 markus 815: if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
816: child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
817: else
818: child_set_env(&env, &envsize, "PATH", getenv("PATH"));
1.28 millert 819: #else
1.29 millert 820: child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
1.28 millert 821: #endif
1.1 markus 822:
823: snprintf(buf, sizeof buf, "%.200s/%.50s",
824: _PATH_MAILDIR, pw->pw_name);
825: child_set_env(&env, &envsize, "MAIL", buf);
826:
827: /* Normal systems set SHELL by default. */
828: child_set_env(&env, &envsize, "SHELL", shell);
829: }
830: if (getenv("TZ"))
831: child_set_env(&env, &envsize, "TZ", getenv("TZ"));
832:
833: /* Set custom environment options from RSA authentication. */
1.110 markus 834: if (!options.use_login) {
835: while (custom_environment) {
836: struct envstring *ce = custom_environment;
1.143 deraadt 837: char *str = ce->s;
1.127 markus 838:
1.143 deraadt 839: for (i = 0; str[i] != '=' && str[i]; i++)
1.110 markus 840: ;
1.143 deraadt 841: if (str[i] == '=') {
842: str[i] = 0;
843: child_set_env(&env, &envsize, str, str + i + 1);
1.110 markus 844: }
845: custom_environment = ce->next;
846: xfree(ce->s);
847: xfree(ce);
1.1 markus 848: }
849: }
850:
1.149 stevesk 851: /* SSH_CLIENT deprecated */
1.1 markus 852: snprintf(buf, sizeof buf, "%.50s %d %d",
1.127 markus 853: get_remote_ipaddr(), get_remote_port(), get_local_port());
1.1 markus 854: child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1.149 stevesk 855:
1.154 markus 856: laddr = get_local_ipaddr(packet_get_connection_in());
1.149 stevesk 857: snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
1.154 markus 858: get_remote_ipaddr(), get_remote_port(), laddr, get_local_port());
859: xfree(laddr);
1.149 stevesk 860: child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
1.1 markus 861:
1.60 markus 862: if (s->ttyfd != -1)
863: child_set_env(&env, &envsize, "SSH_TTY", s->tty);
864: if (s->term)
865: child_set_env(&env, &envsize, "TERM", s->term);
866: if (s->display)
867: child_set_env(&env, &envsize, "DISPLAY", s->display);
1.34 markus 868: if (original_command)
869: child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
870: original_command);
1.96 dugsong 871: #ifdef KRB5
872: if (s->authctxt->krb5_ticket_file)
873: child_set_env(&env, &envsize, "KRB5CCNAME",
1.112 deraadt 874: s->authctxt->krb5_ticket_file);
1.96 dugsong 875: #endif
1.136 markus 876: if (auth_sock_name != NULL)
1.1 markus 877: child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1.136 markus 878: auth_sock_name);
1.1 markus 879:
880: /* read $HOME/.ssh/environment. */
1.146 markus 881: if (options.permit_user_env && !options.use_login) {
1.14 deraadt 882: snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
883: pw->pw_dir);
1.1 markus 884: read_environment_file(&env, &envsize, buf);
885: }
886: if (debug_flag) {
887: /* dump the environment */
888: fprintf(stderr, "Environment:\n");
889: for (i = 0; env[i]; i++)
890: fprintf(stderr, " %.200s\n", env[i]);
891: }
1.127 markus 892: return env;
893: }
894:
895: /*
896: * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
897: * first in this order).
898: */
899: static void
900: do_rc_files(Session *s, const char *shell)
901: {
902: FILE *f = NULL;
903: char cmd[1024];
904: int do_xauth;
905: struct stat st;
906:
907: do_xauth =
908: s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
909:
910: /* ignore _PATH_SSH_USER_RC for subsystems */
911: if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
912: snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
913: shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
914: if (debug_flag)
915: fprintf(stderr, "Running %s\n", cmd);
916: f = popen(cmd, "w");
917: if (f) {
918: if (do_xauth)
919: fprintf(f, "%s %s\n", s->auth_proto,
920: s->auth_data);
921: pclose(f);
922: } else
923: fprintf(stderr, "Could not run %s\n",
924: _PATH_SSH_USER_RC);
925: } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
926: if (debug_flag)
927: fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
928: _PATH_SSH_SYSTEM_RC);
929: f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
930: if (f) {
931: if (do_xauth)
932: fprintf(f, "%s %s\n", s->auth_proto,
933: s->auth_data);
934: pclose(f);
935: } else
936: fprintf(stderr, "Could not run %s\n",
937: _PATH_SSH_SYSTEM_RC);
938: } else if (do_xauth && options.xauth_location != NULL) {
939: /* Add authority data to .Xauthority if appropriate. */
940: if (debug_flag) {
941: fprintf(stderr,
1.151 stevesk 942: "Running %.500s remove %.100s\n",
1.163.2.1 brad 943: options.xauth_location, s->auth_display);
1.151 stevesk 944: fprintf(stderr,
945: "%.500s add %.100s %.100s %.100s\n",
1.127 markus 946: options.xauth_location, s->auth_display,
947: s->auth_proto, s->auth_data);
948: }
949: snprintf(cmd, sizeof cmd, "%s -q -",
950: options.xauth_location);
951: f = popen(cmd, "w");
952: if (f) {
1.151 stevesk 953: fprintf(f, "remove %s\n",
954: s->auth_display);
1.127 markus 955: fprintf(f, "add %s %s %s\n",
956: s->auth_display, s->auth_proto,
957: s->auth_data);
958: pclose(f);
959: } else {
960: fprintf(stderr, "Could not run %s\n",
961: cmd);
962: }
963: }
964: }
965:
966: static void
967: do_nologin(struct passwd *pw)
968: {
969: FILE *f = NULL;
970: char buf[1024];
971:
972: #ifdef HAVE_LOGIN_CAP
973: if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
974: f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
975: _PATH_NOLOGIN), "r");
976: #else
977: if (pw->pw_uid)
978: f = fopen(_PATH_NOLOGIN, "r");
979: #endif
980: if (f) {
981: /* /etc/nologin exists. Print its contents and exit. */
1.155 itojun 982: logit("User %.100s not allowed because %s exists",
1.150 stevesk 983: pw->pw_name, _PATH_NOLOGIN);
1.127 markus 984: while (fgets(buf, sizeof(buf), f))
985: fputs(buf, stderr);
986: fclose(f);
987: exit(254);
988: }
989: }
990:
991: /* Set login name, uid, gid, and groups. */
1.130 provos 992: void
1.127 markus 993: do_setusercontext(struct passwd *pw)
994: {
995: if (getuid() == 0 || geteuid() == 0) {
996: #ifdef HAVE_LOGIN_CAP
997: if (setusercontext(lc, pw, pw->pw_uid,
998: (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
999: perror("unable to set user context");
1000: exit(1);
1001: }
1002: #else
1003: if (setlogin(pw->pw_name) < 0)
1004: error("setlogin failed: %s", strerror(errno));
1005: if (setgid(pw->pw_gid) < 0) {
1006: perror("setgid");
1007: exit(1);
1008: }
1009: /* Initialize the group list. */
1010: if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1011: perror("initgroups");
1012: exit(1);
1013: }
1014: endgrent();
1015:
1016: /* Permanently switch to the desired uid. */
1017: permanently_set_uid(pw);
1018: #endif
1019: }
1020: if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1021: fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1022: }
1023:
1.131 markus 1024: static void
1.163.2.1 brad 1025: do_pwchange(Session *s)
1026: {
1.163.2.2! brad 1027: fflush(NULL);
1.163.2.1 brad 1028: fprintf(stderr, "WARNING: Your password has expired.\n");
1029: if (s->ttyfd != -1) {
1.163.2.2! brad 1030: fprintf(stderr,
1.163.2.1 brad 1031: "You must change your password now and login again!\n");
1032: execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL);
1033: perror("passwd");
1034: } else {
1035: fprintf(stderr,
1036: "Password change required but no TTY available.\n");
1037: }
1038: exit(1);
1039: }
1040:
1041: static void
1.130 provos 1042: launch_login(struct passwd *pw, const char *hostname)
1043: {
1044: /* Launch login(1). */
1045:
1046: execl("/usr/bin/login", "login", "-h", hostname,
1047: "-p", "-f", "--", pw->pw_name, (char *)NULL);
1048:
1049: /* Login couldn't be executed, die. */
1050:
1051: perror("login");
1052: exit(1);
1053: }
1054:
1.163.2.1 brad 1055: static void
1056: child_close_fds(void)
1057: {
1058: int i;
1059:
1060: if (packet_get_connection_in() == packet_get_connection_out())
1061: close(packet_get_connection_in());
1062: else {
1063: close(packet_get_connection_in());
1064: close(packet_get_connection_out());
1065: }
1066: /*
1067: * Close all descriptors related to channels. They will still remain
1068: * open in the parent.
1069: */
1070: /* XXX better use close-on-exec? -markus */
1071: channel_close_all();
1072:
1073: /*
1074: * Close any extra file descriptors. Note that there may still be
1075: * descriptors left by system functions. They will be closed later.
1076: */
1077: endpwent();
1078:
1079: /*
1080: * Close any extra open file descriptors so that we don\'t have them
1081: * hanging around in clients. Note that we want to do this after
1082: * initgroups, because at least on Solaris 2.3 it leaves file
1083: * descriptors open.
1084: */
1085: for (i = 3; i < 64; i++)
1086: close(i);
1087: }
1088:
1.127 markus 1089: /*
1090: * Performs common processing for the child, such as setting up the
1091: * environment, closing extra file descriptors, setting the user and group
1092: * ids, and executing the command or shell.
1093: */
1094: void
1095: do_child(Session *s, const char *command)
1096: {
1097: extern char **environ;
1098: char **env;
1099: char *argv[10];
1100: const char *shell, *shell0, *hostname = NULL;
1101: struct passwd *pw = s->pw;
1102:
1103: /* remove hostkey from the child's memory */
1104: destroy_sensitive_data();
1105:
1.163.2.1 brad 1106: /* Force a password change */
1107: if (s->authctxt->force_pwchange) {
1108: do_setusercontext(pw);
1109: child_close_fds();
1110: do_pwchange(s);
1111: exit(1);
1112: }
1113:
1.127 markus 1114: /* login(1) is only called if we execute the login shell */
1115: if (options.use_login && command != NULL)
1116: options.use_login = 0;
1117:
1118: /*
1119: * Login(1) does this as well, and it needs uid 0 for the "-h"
1120: * switch, so we let login(1) to this for us.
1121: */
1122: if (!options.use_login) {
1123: do_nologin(pw);
1124: do_setusercontext(pw);
1125: }
1126:
1127: /*
1128: * Get the shell from the password data. An empty shell field is
1129: * legal, and means /bin/sh.
1130: */
1131: shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1.152 markus 1132:
1133: /*
1134: * Make sure $SHELL points to the shell from the password file,
1135: * even if shell is overridden from login.conf
1136: */
1137: env = do_setup_env(s, shell);
1138:
1.127 markus 1139: #ifdef HAVE_LOGIN_CAP
1140: shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1141: #endif
1142:
1.26 millert 1143: /* we have to stash the hostname before we close our socket. */
1144: if (options.use_login)
1.70 stevesk 1145: hostname = get_remote_name_or_ip(utmp_len,
1.158 markus 1146: options.use_dns);
1.1 markus 1147: /*
1148: * Close the connection descriptors; note that this is the child, and
1149: * the server will still have the socket open, and it is important
1150: * that we do not shutdown it. Note that the descriptors cannot be
1151: * closed before building the environment, as we call
1152: * get_remote_ipaddr there.
1153: */
1.163.2.1 brad 1154: child_close_fds();
1.1 markus 1155:
1156: /*
1.163.2.1 brad 1157: * Must take new environment into use so that .ssh/rc,
1158: * /etc/ssh/sshrc and xauth are run in the proper environment.
1.1 markus 1159: */
1.163.2.1 brad 1160: environ = env;
1.1 markus 1161:
1.163.2.1 brad 1162: #ifdef KRB5
1.1 markus 1163: /*
1.163.2.1 brad 1164: * At this point, we check to see if AFS is active and if we have
1165: * a valid Kerberos 5 TGT. If so, it seems like a good idea to see
1166: * if we can (and need to) extend the ticket into an AFS token. If
1167: * we don't do this, we run into potential problems if the user's
1168: * home directory is in AFS and it's not world-readable.
1.1 markus 1169: */
1170:
1.163.2.1 brad 1171: if (options.kerberos_get_afs_token && k_hasafs() &&
1172: (s->authctxt->krb5_ctx != NULL)) {
1173: char cell[64];
1174:
1175: debug("Getting AFS token");
1176:
1177: k_setpag();
1178:
1179: if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1180: krb5_afslog(s->authctxt->krb5_ctx,
1181: s->authctxt->krb5_fwd_ccache, cell, NULL);
1182:
1183: krb5_afslog_home(s->authctxt->krb5_ctx,
1184: s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir);
1185: }
1186: #endif
1.104 markus 1187:
1188: /* Change current directory to the user\'s home directory. */
1189: if (chdir(pw->pw_dir) < 0) {
1190: fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1191: pw->pw_dir, strerror(errno));
1192: #ifdef HAVE_LOGIN_CAP
1193: if (login_getcapbool(lc, "requirehome", 0))
1194: exit(1);
1195: #endif
1196: }
1.1 markus 1197:
1.127 markus 1198: if (!options.use_login)
1199: do_rc_files(s, shell);
1.67 markus 1200:
1201: /* restore SIGPIPE for child */
1202: signal(SIGPIPE, SIG_DFL);
1203:
1.127 markus 1204: if (options.use_login) {
1.130 provos 1205: launch_login(pw, hostname);
1206: /* NEVERREACHED */
1.127 markus 1207: }
1208:
1209: /* Get the last component of the shell name. */
1210: if ((shell0 = strrchr(shell, '/')) != NULL)
1211: shell0++;
1212: else
1213: shell0 = shell;
1214:
1.1 markus 1215: /*
1216: * If we have no command, execute the shell. In this case, the shell
1217: * name to be passed in argv[0] is preceded by '-' to indicate that
1218: * this is a login shell.
1219: */
1220: if (!command) {
1.127 markus 1221: char argv0[256];
1.1 markus 1222:
1.127 markus 1223: /* Start the shell. Set initial character to '-'. */
1224: argv0[0] = '-';
1.1 markus 1225:
1.127 markus 1226: if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1.128 markus 1227: >= sizeof(argv0) - 1) {
1.127 markus 1228: errno = EINVAL;
1.1 markus 1229: perror(shell);
1230: exit(1);
1.127 markus 1231: }
1.1 markus 1232:
1.127 markus 1233: /* Execute the shell. */
1234: argv[0] = argv0;
1235: argv[1] = NULL;
1236: execve(shell, argv, env);
1237:
1238: /* Executing the shell failed. */
1239: perror(shell);
1240: exit(1);
1.1 markus 1241: }
1242: /*
1243: * Execute the command using the user's shell. This uses the -c
1244: * option to execute the command.
1245: */
1.127 markus 1246: argv[0] = (char *) shell0;
1.1 markus 1247: argv[1] = "-c";
1248: argv[2] = (char *) command;
1249: argv[3] = NULL;
1250: execve(shell, argv, env);
1251: perror(shell);
1252: exit(1);
1253: }
1254:
1255: Session *
1256: session_new(void)
1257: {
1258: int i;
1259: static int did_init = 0;
1260: if (!did_init) {
1261: debug("session_new: init");
1.112 deraadt 1262: for (i = 0; i < MAX_SESSIONS; i++) {
1.1 markus 1263: sessions[i].used = 0;
1264: }
1265: did_init = 1;
1266: }
1.112 deraadt 1267: for (i = 0; i < MAX_SESSIONS; i++) {
1.1 markus 1268: Session *s = &sessions[i];
1269: if (! s->used) {
1.68 djm 1270: memset(s, 0, sizeof(*s));
1.1 markus 1271: s->chanid = -1;
1272: s->ptyfd = -1;
1273: s->ttyfd = -1;
1274: s->used = 1;
1.85 markus 1275: s->self = i;
1.1 markus 1276: debug("session_new: session %d", i);
1277: return s;
1278: }
1279: }
1280: return NULL;
1281: }
1282:
1.94 itojun 1283: static void
1.1 markus 1284: session_dump(void)
1285: {
1286: int i;
1.112 deraadt 1287: for (i = 0; i < MAX_SESSIONS; i++) {
1.1 markus 1288: Session *s = &sessions[i];
1.137 mpech 1289: debug("dump: used %d session %d %p channel %d pid %ld",
1.1 markus 1290: s->used,
1291: s->self,
1292: s,
1293: s->chanid,
1.137 mpech 1294: (long)s->pid);
1.1 markus 1295: }
1296: }
1297:
1.2 markus 1298: int
1.97 markus 1299: session_open(Authctxt *authctxt, int chanid)
1.2 markus 1300: {
1301: Session *s = session_new();
1302: debug("session_open: channel %d", chanid);
1303: if (s == NULL) {
1304: error("no more sessions");
1305: return 0;
1306: }
1.97 markus 1307: s->authctxt = authctxt;
1308: s->pw = authctxt->pw;
1.163.2.1 brad 1309: if (s->pw == NULL || !authctxt->valid)
1.54 stevesk 1310: fatal("no user for session %d", s->self);
1.2 markus 1311: debug("session_open: session %d: link with channel %d", s->self, chanid);
1312: s->chanid = chanid;
1313: return 1;
1314: }
1315:
1.130 provos 1316: Session *
1317: session_by_tty(char *tty)
1318: {
1319: int i;
1320: for (i = 0; i < MAX_SESSIONS; i++) {
1321: Session *s = &sessions[i];
1322: if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1323: debug("session_by_tty: session %d tty %s", i, tty);
1324: return s;
1325: }
1326: }
1327: debug("session_by_tty: unknown tty %.100s", tty);
1328: session_dump();
1329: return NULL;
1330: }
1331:
1.94 itojun 1332: static Session *
1.2 markus 1333: session_by_channel(int id)
1334: {
1335: int i;
1.112 deraadt 1336: for (i = 0; i < MAX_SESSIONS; i++) {
1.2 markus 1337: Session *s = &sessions[i];
1338: if (s->used && s->chanid == id) {
1339: debug("session_by_channel: session %d channel %d", i, id);
1340: return s;
1341: }
1342: }
1343: debug("session_by_channel: unknown channel %d", id);
1344: session_dump();
1345: return NULL;
1346: }
1347:
1.94 itojun 1348: static Session *
1.2 markus 1349: session_by_pid(pid_t pid)
1350: {
1351: int i;
1.137 mpech 1352: debug("session_by_pid: pid %ld", (long)pid);
1.112 deraadt 1353: for (i = 0; i < MAX_SESSIONS; i++) {
1.2 markus 1354: Session *s = &sessions[i];
1355: if (s->used && s->pid == pid)
1356: return s;
1357: }
1.137 mpech 1358: error("session_by_pid: unknown pid %ld", (long)pid);
1.2 markus 1359: session_dump();
1360: return NULL;
1361: }
1362:
1.94 itojun 1363: static int
1.2 markus 1364: session_window_change_req(Session *s)
1365: {
1366: s->col = packet_get_int();
1367: s->row = packet_get_int();
1368: s->xpixel = packet_get_int();
1369: s->ypixel = packet_get_int();
1.116 markus 1370: packet_check_eom();
1.2 markus 1371: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1372: return 1;
1373: }
1374:
1.94 itojun 1375: static int
1.2 markus 1376: session_pty_req(Session *s)
1377: {
1.45 markus 1378: u_int len;
1.72 stevesk 1379: int n_bytes;
1.132 markus 1380:
1.86 markus 1381: if (no_pty_flag) {
1382: debug("Allocating a pty not permitted for this authentication.");
1.19 markus 1383: return 0;
1.86 markus 1384: }
1385: if (s->ttyfd != -1) {
1386: packet_disconnect("Protocol error: you already have a pty.");
1.3 markus 1387: return 0;
1.134 markus 1388: }
1.86 markus 1389:
1.2 markus 1390: s->term = packet_get_string(&len);
1.86 markus 1391:
1392: if (compat20) {
1393: s->col = packet_get_int();
1394: s->row = packet_get_int();
1395: } else {
1396: s->row = packet_get_int();
1397: s->col = packet_get_int();
1398: }
1.2 markus 1399: s->xpixel = packet_get_int();
1400: s->ypixel = packet_get_int();
1401:
1402: if (strcmp(s->term, "") == 0) {
1403: xfree(s->term);
1404: s->term = NULL;
1405: }
1.86 markus 1406:
1.2 markus 1407: /* Allocate a pty and open it. */
1.86 markus 1408: debug("Allocating pty.");
1.130 provos 1409: if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) {
1.86 markus 1410: if (s->term)
1411: xfree(s->term);
1.2 markus 1412: s->term = NULL;
1413: s->ptyfd = -1;
1414: s->ttyfd = -1;
1415: error("session_pty_req: session %d alloc failed", s->self);
1.3 markus 1416: return 0;
1.2 markus 1417: }
1418: debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1.86 markus 1419:
1420: /* for SSH1 the tty modes length is not given */
1421: if (!compat20)
1422: n_bytes = packet_remaining();
1423: tty_parse_modes(s->ttyfd, &n_bytes);
1424:
1.130 provos 1425: if (!use_privsep)
1426: pty_setowner(s->pw, s->tty);
1.86 markus 1427:
1428: /* Set window size from the packet. */
1.2 markus 1429: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1430:
1.116 markus 1431: packet_check_eom();
1.9 markus 1432: session_proctitle(s);
1.2 markus 1433: return 1;
1434: }
1435:
1.94 itojun 1436: static int
1.7 markus 1437: session_subsystem_req(Session *s)
1438: {
1.105 markus 1439: struct stat st;
1.45 markus 1440: u_int len;
1.7 markus 1441: int success = 0;
1.105 markus 1442: char *cmd, *subsys = packet_get_string(&len);
1.18 jakob 1443: int i;
1.7 markus 1444:
1.116 markus 1445: packet_check_eom();
1.155 itojun 1446: logit("subsystem request for %.100s", subsys);
1.18 jakob 1447:
1448: for (i = 0; i < options.num_subsystems; i++) {
1.105 markus 1449: if (strcmp(subsys, options.subsystem_name[i]) == 0) {
1450: cmd = options.subsystem_command[i];
1451: if (stat(cmd, &st) < 0) {
1452: error("subsystem: cannot stat %s: %s", cmd,
1453: strerror(errno));
1454: break;
1455: }
1456: debug("subsystem: exec() %s", cmd);
1.64 markus 1457: s->is_subsystem = 1;
1.105 markus 1458: do_exec(s, cmd);
1.18 jakob 1459: success = 1;
1.122 markus 1460: break;
1.18 jakob 1461: }
1462: }
1463:
1464: if (!success)
1.155 itojun 1465: logit("subsystem request for %.100s failed, subsystem not found",
1.105 markus 1466: subsys);
1.7 markus 1467:
1468: xfree(subsys);
1469: return success;
1470: }
1471:
1.94 itojun 1472: static int
1.7 markus 1473: session_x11_req(Session *s)
1474: {
1.81 markus 1475: int success;
1.7 markus 1476:
1477: s->single_connection = packet_get_char();
1478: s->auth_proto = packet_get_string(NULL);
1479: s->auth_data = packet_get_string(NULL);
1480: s->screen = packet_get_int();
1.116 markus 1481: packet_check_eom();
1.7 markus 1482:
1.81 markus 1483: success = session_setup_x11fwd(s);
1484: if (!success) {
1.7 markus 1485: xfree(s->auth_proto);
1486: xfree(s->auth_data);
1.84 markus 1487: s->auth_proto = NULL;
1488: s->auth_data = NULL;
1.7 markus 1489: }
1.81 markus 1490: return success;
1.7 markus 1491: }
1492:
1.94 itojun 1493: static int
1.19 markus 1494: session_shell_req(Session *s)
1495: {
1.116 markus 1496: packet_check_eom();
1.90 markus 1497: do_exec(s, NULL);
1.19 markus 1498: return 1;
1499: }
1500:
1.94 itojun 1501: static int
1.19 markus 1502: session_exec_req(Session *s)
1503: {
1.45 markus 1504: u_int len;
1.19 markus 1505: char *command = packet_get_string(&len);
1.116 markus 1506: packet_check_eom();
1.90 markus 1507: do_exec(s, command);
1.92 markus 1508: xfree(command);
1.19 markus 1509: return 1;
1510: }
1511:
1.94 itojun 1512: static int
1.157 markus 1513: session_break_req(Session *s)
1514: {
1515:
1.163.2.2! brad 1516: packet_get_int(); /* ignored */
1.157 markus 1517: packet_check_eom();
1518:
1.160 markus 1519: if (s->ttyfd == -1 ||
1520: tcsendbreak(s->ttyfd, 0) < 0)
1.157 markus 1521: return 0;
1522: return 1;
1523: }
1524:
1525: static int
1.163.2.2! brad 1526: session_env_req(Session *s)
! 1527: {
! 1528: char *name, *val;
! 1529: u_int name_len, val_len, i;
! 1530:
! 1531: name = packet_get_string(&name_len);
! 1532: val = packet_get_string(&val_len);
! 1533: packet_check_eom();
! 1534:
! 1535: /* Don't set too many environment variables */
! 1536: if (s->num_env > 128) {
! 1537: debug2("Ignoring env request %s: too many env vars", name);
! 1538: goto fail;
! 1539: }
! 1540:
! 1541: for (i = 0; i < options.num_accept_env; i++) {
! 1542: if (match_pattern(name, options.accept_env[i])) {
! 1543: debug2("Setting env %d: %s=%s", s->num_env, name, val);
! 1544: s->env = xrealloc(s->env, sizeof(*s->env) *
! 1545: (s->num_env + 1));
! 1546: s->env[s->num_env].name = name;
! 1547: s->env[s->num_env].val = val;
! 1548: s->num_env++;
! 1549: return (1);
! 1550: }
! 1551: }
! 1552: debug2("Ignoring env request %s: disallowed name", name);
! 1553:
! 1554: fail:
! 1555: xfree(name);
! 1556: xfree(val);
! 1557: return (0);
! 1558: }
! 1559:
! 1560: static int
1.43 markus 1561: session_auth_agent_req(Session *s)
1562: {
1563: static int called = 0;
1.116 markus 1564: packet_check_eom();
1.44 markus 1565: if (no_agent_forwarding_flag) {
1566: debug("session_auth_agent_req: no_agent_forwarding_flag");
1567: return 0;
1568: }
1.43 markus 1569: if (called) {
1570: return 0;
1571: } else {
1572: called = 1;
1573: return auth_input_request_forwarding(s->pw);
1574: }
1575: }
1576:
1.123 markus 1577: int
1578: session_input_channel_req(Channel *c, const char *rtype)
1.2 markus 1579: {
1580: int success = 0;
1581: Session *s;
1582:
1.123 markus 1583: if ((s = session_by_channel(c->self)) == NULL) {
1.155 itojun 1584: logit("session_input_channel_req: no session %d req %.100s",
1.123 markus 1585: c->self, rtype);
1586: return 0;
1587: }
1588: debug("session_input_channel_req: session %d req %s", s->self, rtype);
1.2 markus 1589:
1590: /*
1.64 markus 1591: * a session is in LARVAL state until a shell, a command
1592: * or a subsystem is executed
1.2 markus 1593: */
1594: if (c->type == SSH_CHANNEL_LARVAL) {
1595: if (strcmp(rtype, "shell") == 0) {
1.19 markus 1596: success = session_shell_req(s);
1.2 markus 1597: } else if (strcmp(rtype, "exec") == 0) {
1.19 markus 1598: success = session_exec_req(s);
1.2 markus 1599: } else if (strcmp(rtype, "pty-req") == 0) {
1.3 markus 1600: success = session_pty_req(s);
1.7 markus 1601: } else if (strcmp(rtype, "x11-req") == 0) {
1602: success = session_x11_req(s);
1.43 markus 1603: } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1604: success = session_auth_agent_req(s);
1.7 markus 1605: } else if (strcmp(rtype, "subsystem") == 0) {
1606: success = session_subsystem_req(s);
1.163.2.2! brad 1607: } else if (strcmp(rtype, "env") == 0) {
! 1608: success = session_env_req(s);
1.2 markus 1609: }
1610: }
1611: if (strcmp(rtype, "window-change") == 0) {
1612: success = session_window_change_req(s);
1.163.2.2! brad 1613: } else if (strcmp(rtype, "break") == 0) {
! 1614: success = session_break_req(s);
1.2 markus 1615: }
1.163.2.2! brad 1616:
1.123 markus 1617: return success;
1.2 markus 1618: }
1619:
1620: void
1621: session_set_fds(Session *s, int fdin, int fdout, int fderr)
1622: {
1623: if (!compat20)
1624: fatal("session_set_fds: called for proto != 2.0");
1625: /*
1626: * now that have a child and a pipe to the child,
1627: * we can activate our channel and register the fd's
1628: */
1629: if (s->chanid == -1)
1630: fatal("no channel for session %d", s->self);
1631: channel_set_fds(s->chanid,
1632: fdout, fdin, fderr,
1.42 markus 1633: fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1.126 markus 1634: 1,
1635: CHAN_SES_WINDOW_DEFAULT);
1.2 markus 1636: }
1637:
1.85 markus 1638: /*
1639: * Function to perform pty cleanup. Also called if we get aborted abnormally
1640: * (e.g., due to a dropped connection).
1641: */
1.130 provos 1642: void
1.163.2.1 brad 1643: session_pty_cleanup2(Session *s)
1.1 markus 1644: {
1.85 markus 1645: if (s == NULL) {
1646: error("session_pty_cleanup: no session");
1647: return;
1648: }
1649: if (s->ttyfd == -1)
1.1 markus 1650: return;
1651:
1.54 stevesk 1652: debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
1.1 markus 1653:
1654: /* Record that the user has logged out. */
1.85 markus 1655: if (s->pid != 0)
1656: record_logout(s->pid, s->tty);
1.1 markus 1657:
1658: /* Release the pseudo-tty. */
1.130 provos 1659: if (getuid() == 0)
1660: pty_release(s->tty);
1.1 markus 1661:
1662: /*
1663: * Close the server side of the socket pairs. We must do this after
1664: * the pty cleanup, so that another process doesn't get this pty
1665: * while we're still cleaning up.
1666: */
1667: if (close(s->ptymaster) < 0)
1.130 provos 1668: error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
1.108 markus 1669:
1670: /* unlink pty from session */
1671: s->ttyfd = -1;
1.2 markus 1672: }
1673:
1.130 provos 1674: void
1.163.2.1 brad 1675: session_pty_cleanup(Session *s)
1.130 provos 1676: {
1.163.2.1 brad 1677: PRIVSEP(session_pty_cleanup2(s));
1.130 provos 1678: }
1679:
1.147 markus 1680: static char *
1681: sig2name(int sig)
1682: {
1683: #define SSH_SIG(x) if (sig == SIG ## x) return #x
1684: SSH_SIG(ABRT);
1685: SSH_SIG(ALRM);
1686: SSH_SIG(FPE);
1687: SSH_SIG(HUP);
1688: SSH_SIG(ILL);
1689: SSH_SIG(INT);
1690: SSH_SIG(KILL);
1691: SSH_SIG(PIPE);
1692: SSH_SIG(QUIT);
1693: SSH_SIG(SEGV);
1694: SSH_SIG(TERM);
1695: SSH_SIG(USR1);
1696: SSH_SIG(USR2);
1697: #undef SSH_SIG
1698: return "SIG@openssh.com";
1699: }
1700:
1.94 itojun 1701: static void
1.2 markus 1702: session_exit_message(Session *s, int status)
1703: {
1704: Channel *c;
1.124 markus 1705:
1706: if ((c = channel_lookup(s->chanid)) == NULL)
1.85 markus 1707: fatal("session_exit_message: session %d: no channel %d",
1.2 markus 1708: s->self, s->chanid);
1.137 mpech 1709: debug("session_exit_message: session %d channel %d pid %ld",
1710: s->self, s->chanid, (long)s->pid);
1.2 markus 1711:
1712: if (WIFEXITED(status)) {
1.124 markus 1713: channel_request_start(s->chanid, "exit-status", 0);
1.2 markus 1714: packet_put_int(WEXITSTATUS(status));
1715: packet_send();
1716: } else if (WIFSIGNALED(status)) {
1.124 markus 1717: channel_request_start(s->chanid, "exit-signal", 0);
1.147 markus 1718: packet_put_cstring(sig2name(WTERMSIG(status)));
1.2 markus 1719: packet_put_char(WCOREDUMP(status));
1720: packet_put_cstring("");
1721: packet_put_cstring("");
1722: packet_send();
1723: } else {
1724: /* Some weird exit cause. Just exit. */
1725: packet_disconnect("wait returned status %04x.", status);
1726: }
1727:
1728: /* disconnect channel */
1729: debug("session_exit_message: release channel %d", s->chanid);
1730: channel_cancel_cleanup(s->chanid);
1.5 markus 1731: /*
1732: * emulate a write failure with 'chan_write_failed', nobody will be
1733: * interested in data we write.
1734: * Note that we must not call 'chan_read_failed', since there could
1735: * be some more data waiting in the pipe.
1736: */
1.8 markus 1737: if (c->ostate != CHAN_OUTPUT_CLOSED)
1738: chan_write_failed(c);
1.2 markus 1739: s->chanid = -1;
1740: }
1741:
1.130 provos 1742: void
1.85 markus 1743: session_close(Session *s)
1.2 markus 1744: {
1.163.2.2! brad 1745: int i;
! 1746:
1.137 mpech 1747: debug("session_close: session %d pid %ld", s->self, (long)s->pid);
1.163.2.1 brad 1748: if (s->ttyfd != -1)
1.85 markus 1749: session_pty_cleanup(s);
1.2 markus 1750: if (s->term)
1751: xfree(s->term);
1752: if (s->display)
1753: xfree(s->display);
1.118 stevesk 1754: if (s->auth_display)
1755: xfree(s->auth_display);
1.2 markus 1756: if (s->auth_data)
1757: xfree(s->auth_data);
1758: if (s->auth_proto)
1759: xfree(s->auth_proto);
1760: s->used = 0;
1.163.2.2! brad 1761: for (i = 0; i < s->num_env; i++) {
! 1762: xfree(s->env[i].name);
! 1763: xfree(s->env[i].val);
! 1764: }
! 1765: if (s->env != NULL)
! 1766: xfree(s->env);
1.9 markus 1767: session_proctitle(s);
1.2 markus 1768: }
1769:
1770: void
1771: session_close_by_pid(pid_t pid, int status)
1772: {
1773: Session *s = session_by_pid(pid);
1774: if (s == NULL) {
1.137 mpech 1775: debug("session_close_by_pid: no session for pid %ld",
1776: (long)pid);
1.2 markus 1777: return;
1778: }
1779: if (s->chanid != -1)
1780: session_exit_message(s, status);
1781: session_close(s);
1.98 markus 1782: }
1783:
1.2 markus 1784: /*
1785: * this is called when a channel dies before
1786: * the session 'child' itself dies
1787: */
1788: void
1789: session_close_by_channel(int id, void *arg)
1790: {
1791: Session *s = session_by_channel(id);
1792: if (s == NULL) {
1.107 markus 1793: debug("session_close_by_channel: no session for id %d", id);
1.2 markus 1794: return;
1795: }
1.137 mpech 1796: debug("session_close_by_channel: channel %d child %ld",
1797: id, (long)s->pid);
1.107 markus 1798: if (s->pid != 0) {
1799: debug("session_close_by_channel: channel %d: has child", id);
1.108 markus 1800: /*
1801: * delay detach of session, but release pty, since
1802: * the fd's to the child are already closed
1803: */
1.163.2.1 brad 1804: if (s->ttyfd != -1)
1.108 markus 1805: session_pty_cleanup(s);
1.107 markus 1806: return;
1807: }
1808: /* detach by removing callback */
1.2 markus 1809: channel_cancel_cleanup(s->chanid);
1810: s->chanid = -1;
1.106 markus 1811: session_close(s);
1812: }
1813:
1814: void
1.130 provos 1815: session_destroy_all(void (*closefunc)(Session *))
1.106 markus 1816: {
1817: int i;
1.112 deraadt 1818: for (i = 0; i < MAX_SESSIONS; i++) {
1.106 markus 1819: Session *s = &sessions[i];
1.130 provos 1820: if (s->used) {
1821: if (closefunc != NULL)
1822: closefunc(s);
1823: else
1824: session_close(s);
1825: }
1.2 markus 1826: }
1.9 markus 1827: }
1828:
1.94 itojun 1829: static char *
1.9 markus 1830: session_tty_list(void)
1831: {
1832: static char buf[1024];
1833: int i;
1834: buf[0] = '\0';
1.112 deraadt 1835: for (i = 0; i < MAX_SESSIONS; i++) {
1.9 markus 1836: Session *s = &sessions[i];
1837: if (s->used && s->ttyfd != -1) {
1838: if (buf[0] != '\0')
1839: strlcat(buf, ",", sizeof buf);
1840: strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
1841: }
1842: }
1843: if (buf[0] == '\0')
1844: strlcpy(buf, "notty", sizeof buf);
1845: return buf;
1846: }
1847:
1848: void
1849: session_proctitle(Session *s)
1850: {
1851: if (s->pw == NULL)
1852: error("no user for session %d", s->self);
1853: else
1854: setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1.81 markus 1855: }
1856:
1857: int
1858: session_setup_x11fwd(Session *s)
1859: {
1860: struct stat st;
1.109 stevesk 1861: char display[512], auth_display[512];
1862: char hostname[MAXHOSTNAMELEN];
1.81 markus 1863:
1864: if (no_x11_forwarding_flag) {
1865: packet_send_debug("X11 forwarding disabled in user configuration file.");
1866: return 0;
1867: }
1868: if (!options.x11_forwarding) {
1869: debug("X11 forwarding disabled in server configuration file.");
1870: return 0;
1871: }
1872: if (!options.xauth_location ||
1873: (stat(options.xauth_location, &st) == -1)) {
1874: packet_send_debug("No xauth program; cannot forward with spoofing.");
1.91 markus 1875: return 0;
1876: }
1877: if (options.use_login) {
1878: packet_send_debug("X11 forwarding disabled; "
1879: "not compatible with UseLogin=yes.");
1.81 markus 1880: return 0;
1881: }
1.87 markus 1882: if (s->display != NULL) {
1.81 markus 1883: debug("X11 display already set.");
1884: return 0;
1885: }
1.140 deraadt 1886: if (x11_create_display_inet(options.x11_display_offset,
1887: options.x11_use_localhost, s->single_connection,
1888: &s->display_number) == -1) {
1.87 markus 1889: debug("x11_create_display_inet failed.");
1.81 markus 1890: return 0;
1891: }
1.109 stevesk 1892:
1893: /* Set up a suitable value for the DISPLAY variable. */
1894: if (gethostname(hostname, sizeof(hostname)) < 0)
1895: fatal("gethostname: %.100s", strerror(errno));
1896: /*
1897: * auth_display must be used as the displayname when the
1898: * authorization entry is added with xauth(1). This will be
1899: * different than the DISPLAY string for localhost displays.
1900: */
1.119 stevesk 1901: if (options.x11_use_localhost) {
1.140 deraadt 1902: snprintf(display, sizeof display, "localhost:%u.%u",
1.109 stevesk 1903: s->display_number, s->screen);
1.140 deraadt 1904: snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
1.118 stevesk 1905: s->display_number, s->screen);
1.109 stevesk 1906: s->display = xstrdup(display);
1.118 stevesk 1907: s->auth_display = xstrdup(auth_display);
1.109 stevesk 1908: } else {
1.140 deraadt 1909: snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
1.109 stevesk 1910: s->display_number, s->screen);
1911: s->display = xstrdup(display);
1.118 stevesk 1912: s->auth_display = xstrdup(display);
1.109 stevesk 1913: }
1914:
1.81 markus 1915: return 1;
1.2 markus 1916: }
1917:
1.94 itojun 1918: static void
1.49 markus 1919: do_authenticated2(Authctxt *authctxt)
1.2 markus 1920: {
1.97 markus 1921: server_loop2(authctxt);
1.163.2.1 brad 1922: }
1923:
1924: void
1925: do_cleanup(Authctxt *authctxt)
1926: {
1927: static int called = 0;
1928:
1929: debug("do_cleanup");
1930:
1931: /* no cleanup if we're in the child for login shell */
1932: if (is_child)
1933: return;
1934:
1935: /* avoid double cleanup */
1936: if (called)
1937: return;
1938: called = 1;
1939:
1940: if (authctxt == NULL)
1941: return;
1942: #ifdef KRB5
1943: if (options.kerberos_ticket_cleanup &&
1944: authctxt->krb5_ctx)
1945: krb5_cleanup_proc(authctxt);
1.161 markus 1946: #endif
1.163.2.1 brad 1947:
1948: #ifdef GSSAPI
1949: if (compat20 && options.gss_cleanup_creds)
1950: ssh_gssapi_cleanup_creds();
1951: #endif
1952:
1953: /* remove agent socket */
1954: auth_sock_cleanup_proc(authctxt->pw);
1955:
1956: /*
1957: * Cleanup ptys/utmp only if privsep is disabled,
1958: * or if running in monitor.
1959: */
1960: if (!use_privsep || mm_is_monitor())
1961: session_destroy_all(session_pty_cleanup2);
1.1 markus 1962: }