Annotation of src/usr.bin/ssh/session.c, Revision 1.173
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"
1.173 ! djm 36: RCSID("$OpenBSD: session.c,v 1.172 2004/01/30 09:48:57 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"
1.173 ! djm 45: #include "match.h"
1.1 markus 46: #include "mpaux.h"
47: #include "uidswap.h"
48: #include "compat.h"
1.78 markus 49: #include "channels.h"
1.2 markus 50: #include "bufaux.h"
51: #include "auth.h"
1.19 markus 52: #include "auth-options.h"
1.50 markus 53: #include "pathnames.h"
1.51 markus 54: #include "log.h"
55: #include "servconf.h"
1.59 djm 56: #include "sshlogin.h"
1.51 markus 57: #include "serverloop.h"
58: #include "canohost.h"
1.55 itojun 59: #include "session.h"
1.130 provos 60: #include "monitor_wrap.h"
1.171 markus 61:
62: #ifdef KRB5
63: #include <kafs.h>
64: #endif
1.1 markus 65:
1.161 markus 66: #ifdef GSSAPI
67: #include "ssh-gss.h"
68: #endif
69:
1.1 markus 70: /* func */
71:
72: Session *session_new(void);
1.94 itojun 73: void session_set_fds(Session *, int, int, int);
1.165 markus 74: void session_pty_cleanup(Session *);
1.94 itojun 75: void session_proctitle(Session *);
76: int session_setup_x11fwd(Session *);
77: void do_exec_pty(Session *, const char *);
78: void do_exec_no_pty(Session *, const char *);
79: void do_exec(Session *, const char *);
80: void do_login(Session *, const char *);
81: void do_child(Session *, const char *);
1.73 djm 82: void do_motd(void);
1.94 itojun 83: int check_quietlogin(Session *, const char *);
1.1 markus 84:
1.94 itojun 85: static void do_authenticated1(Authctxt *);
86: static void do_authenticated2(Authctxt *);
87:
88: static int session_pty_req(Session *);
1.65 markus 89:
1.1 markus 90: /* import */
91: extern ServerOptions options;
92: extern char *__progname;
93: extern int log_stderr;
94: extern int debug_flag;
1.45 markus 95: extern u_int utmp_len;
1.21 markus 96: extern int startup_pipe;
1.74 markus 97: extern void destroy_sensitive_data(void);
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:
1.165 markus 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
1.165 markus 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);
1.166 markus 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. */
1.169 markus 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:
193:
1.65 markus 194: void
195: do_authenticated(Authctxt *authctxt)
196: {
1.153 markus 197: setproctitle("%s", authctxt->pw->pw_name);
198:
1.65 markus 199: /*
200: * Cancel the alarm we set to limit the time taken for
201: * authentication.
202: */
203: alarm(0);
204: if (startup_pipe != -1) {
205: close(startup_pipe);
206: startup_pipe = -1;
207: }
208: /* setup the channel layer */
209: if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
210: channel_permit_all_opens();
211:
212: if (compat20)
213: do_authenticated2(authctxt);
214: else
215: do_authenticated1(authctxt);
1.79 markus 216:
1.165 markus 217: do_cleanup(authctxt);
1.65 markus 218: }
219:
1.1 markus 220: /*
221: * Prepares for an interactive session. This is called after the user has
222: * been successfully authenticated. During this message exchange, pseudo
223: * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
224: * are requested, etc.
225: */
1.94 itojun 226: static void
1.65 markus 227: do_authenticated1(Authctxt *authctxt)
1.1 markus 228: {
229: Session *s;
1.65 markus 230: char *command;
1.117 markus 231: int success, type, screen_flag;
1.139 deraadt 232: int enable_compression_after_reply = 0;
233: u_int proto_len, data_len, dlen, compression_level = 0;
1.1 markus 234:
1.61 markus 235: s = session_new();
1.96 dugsong 236: s->authctxt = authctxt;
1.65 markus 237: s->pw = authctxt->pw;
1.28 millert 238:
1.1 markus 239: /*
240: * We stay in this loop until the client requests to execute a shell
241: * or a command.
242: */
243: for (;;) {
1.65 markus 244: success = 0;
1.1 markus 245:
246: /* Get a packet from the client. */
1.117 markus 247: type = packet_read();
1.1 markus 248:
249: /* Process the packet. */
250: switch (type) {
251: case SSH_CMSG_REQUEST_COMPRESSION:
252: compression_level = packet_get_int();
1.116 markus 253: packet_check_eom();
1.1 markus 254: if (compression_level < 1 || compression_level > 9) {
255: packet_send_debug("Received illegal compression level %d.",
1.112 deraadt 256: compression_level);
1.138 markus 257: break;
258: }
259: if (!options.compression) {
260: debug2("compression disabled");
1.1 markus 261: break;
262: }
263: /* Enable compression after we have responded with SUCCESS. */
264: enable_compression_after_reply = 1;
265: success = 1;
266: break;
267:
268: case SSH_CMSG_REQUEST_PTY:
1.86 markus 269: success = session_pty_req(s);
1.1 markus 270: break;
271:
272: case SSH_CMSG_X11_REQUEST_FORWARDING:
273: s->auth_proto = packet_get_string(&proto_len);
274: s->auth_data = packet_get_string(&data_len);
275:
1.57 markus 276: screen_flag = packet_get_protocol_flags() &
277: SSH_PROTOFLAG_SCREEN_NUMBER;
278: debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
279:
280: if (packet_remaining() == 4) {
281: if (!screen_flag)
282: debug2("Buggy client: "
283: "X11 screen flag missing");
1.1 markus 284: s->screen = packet_get_int();
1.56 markus 285: } else {
1.1 markus 286: s->screen = 0;
1.56 markus 287: }
1.116 markus 288: packet_check_eom();
1.81 markus 289: success = session_setup_x11fwd(s);
290: if (!success) {
291: xfree(s->auth_proto);
292: xfree(s->auth_data);
1.84 markus 293: s->auth_proto = NULL;
294: s->auth_data = NULL;
1.1 markus 295: }
296: break;
297:
298: case SSH_CMSG_AGENT_REQUEST_FORWARDING:
299: if (no_agent_forwarding_flag || compat13) {
300: debug("Authentication agent forwarding not permitted for this authentication.");
301: break;
302: }
303: debug("Received authentication agent forwarding request.");
1.65 markus 304: success = auth_input_request_forwarding(s->pw);
1.1 markus 305: break;
306:
307: case SSH_CMSG_PORT_FORWARD_REQUEST:
308: if (no_port_forwarding_flag) {
309: debug("Port forwarding not permitted for this authentication.");
1.39 markus 310: break;
311: }
312: if (!options.allow_tcp_forwarding) {
313: debug("Port forwarding not permitted.");
1.1 markus 314: break;
315: }
316: debug("Received TCP/IP port forwarding request.");
1.65 markus 317: channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
1.1 markus 318: success = 1;
319: break;
320:
321: case SSH_CMSG_MAX_PACKET_SIZE:
322: if (packet_set_maxsize(packet_get_int()) > 0)
323: success = 1;
324: break;
325:
326: case SSH_CMSG_EXEC_SHELL:
327: case SSH_CMSG_EXEC_CMD:
328: if (type == SSH_CMSG_EXEC_CMD) {
329: command = packet_get_string(&dlen);
330: debug("Exec command '%.500s'", command);
1.92 markus 331: do_exec(s, command);
332: xfree(command);
1.1 markus 333: } else {
1.92 markus 334: do_exec(s, NULL);
1.1 markus 335: }
1.116 markus 336: packet_check_eom();
1.82 markus 337: session_close(s);
1.1 markus 338: return;
339:
340: default:
341: /*
342: * Any unknown messages in this phase are ignored,
343: * and a failure message is returned.
344: */
1.155 itojun 345: logit("Unknown packet type received after authentication: %d", type);
1.1 markus 346: }
347: packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
348: packet_send();
349: packet_write_wait();
350:
351: /* Enable compression now that we have replied if appropriate. */
352: if (enable_compression_after_reply) {
353: enable_compression_after_reply = 0;
354: packet_start_compression(compression_level);
355: }
356: }
357: }
358:
359: /*
360: * This is called to fork and execute a command when we have no tty. This
361: * will call do_child from the child, and server_loop from the parent after
362: * setting up file descriptors and such.
363: */
1.4 markus 364: void
1.63 markus 365: do_exec_no_pty(Session *s, const char *command)
1.1 markus 366: {
1.137 mpech 367: pid_t pid;
1.1 markus 368:
369: #ifdef USE_PIPES
370: int pin[2], pout[2], perr[2];
371: /* Allocate pipes for communicating with the program. */
372: if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
373: packet_disconnect("Could not create pipes: %.100s",
374: strerror(errno));
375: #else /* USE_PIPES */
376: int inout[2], err[2];
377: /* Uses socket pairs to communicate with the program. */
378: if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
379: socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
380: packet_disconnect("Could not create socket pairs: %.100s",
381: strerror(errno));
382: #endif /* USE_PIPES */
383: if (s == NULL)
384: fatal("do_exec_no_pty: no session");
385:
1.9 markus 386: session_proctitle(s);
1.1 markus 387:
388: /* Fork the child. */
389: if ((pid = fork()) == 0) {
1.165 markus 390: is_child = 1;
1.144 markus 391:
1.1 markus 392: /* Child. Reinitialize the log since the pid has changed. */
393: log_init(__progname, options.log_level, options.log_facility, log_stderr);
394:
395: /*
396: * Create a new session and process group since the 4.4BSD
397: * setlogin() affects the entire process group.
398: */
399: if (setsid() < 0)
400: error("setsid failed: %.100s", strerror(errno));
401:
402: #ifdef USE_PIPES
403: /*
404: * Redirect stdin. We close the parent side of the socket
405: * pair, and make the child side the standard input.
406: */
407: close(pin[1]);
408: if (dup2(pin[0], 0) < 0)
409: perror("dup2 stdin");
410: close(pin[0]);
411:
412: /* Redirect stdout. */
413: close(pout[0]);
414: if (dup2(pout[1], 1) < 0)
415: perror("dup2 stdout");
416: close(pout[1]);
417:
418: /* Redirect stderr. */
419: close(perr[0]);
420: if (dup2(perr[1], 2) < 0)
421: perror("dup2 stderr");
422: close(perr[1]);
423: #else /* USE_PIPES */
424: /*
425: * Redirect stdin, stdout, and stderr. Stdin and stdout will
426: * use the same socket, as some programs (particularly rdist)
427: * seem to depend on it.
428: */
429: close(inout[1]);
430: close(err[1]);
431: if (dup2(inout[0], 0) < 0) /* stdin */
432: perror("dup2 stdin");
433: if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
434: perror("dup2 stdout");
435: if (dup2(err[0], 2) < 0) /* stderr */
436: perror("dup2 stderr");
437: #endif /* USE_PIPES */
438:
439: /* Do processing for the child (exec command etc). */
1.60 markus 440: do_child(s, command);
1.1 markus 441: /* NOTREACHED */
442: }
443: if (pid < 0)
444: packet_disconnect("fork failed: %.100s", strerror(errno));
445: s->pid = pid;
1.47 markus 446: /* Set interactive/non-interactive mode. */
1.48 markus 447: packet_set_interactive(s->display != NULL);
1.1 markus 448: #ifdef USE_PIPES
449: /* We are the parent. Close the child sides of the pipes. */
450: close(pin[0]);
451: close(pout[1]);
452: close(perr[1]);
453:
1.2 markus 454: if (compat20) {
1.64 markus 455: session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]);
1.2 markus 456: } else {
457: /* Enter the interactive session. */
458: server_loop(pid, pin[1], pout[0], perr[0]);
1.64 markus 459: /* server_loop has closed pin[1], pout[0], and perr[0]. */
1.2 markus 460: }
1.1 markus 461: #else /* USE_PIPES */
462: /* We are the parent. Close the child sides of the socket pairs. */
463: close(inout[0]);
464: close(err[0]);
465:
466: /*
467: * Enter the interactive session. Note: server_loop must be able to
468: * handle the case that fdin and fdout are the same.
469: */
1.2 markus 470: if (compat20) {
1.64 markus 471: session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
1.2 markus 472: } else {
473: server_loop(pid, inout[1], inout[1], err[1]);
474: /* server_loop has closed inout[1] and err[1]. */
475: }
1.1 markus 476: #endif /* USE_PIPES */
477: }
478:
479: /*
480: * This is called to fork and execute a command when we have a tty. This
481: * will call do_child from the child, and server_loop from the parent after
482: * setting up file descriptors, controlling tty, updating wtmp, utmp,
483: * lastlog, and other such operations.
484: */
1.4 markus 485: void
1.63 markus 486: do_exec_pty(Session *s, const char *command)
1.1 markus 487: {
488: int fdout, ptyfd, ttyfd, ptymaster;
489: pid_t pid;
490:
491: if (s == NULL)
492: fatal("do_exec_pty: no session");
493: ptyfd = s->ptyfd;
494: ttyfd = s->ttyfd;
495:
496: /* Fork the child. */
497: if ((pid = fork()) == 0) {
1.165 markus 498: is_child = 1;
1.97 markus 499:
1.24 markus 500: /* Child. Reinitialize the log because the pid has changed. */
1.1 markus 501: log_init(__progname, options.log_level, options.log_facility, log_stderr);
502: /* Close the master side of the pseudo tty. */
503: close(ptyfd);
504:
505: /* Make the pseudo tty our controlling tty. */
506: pty_make_controlling_tty(&ttyfd, s->tty);
507:
1.103 markus 508: /* Redirect stdin/stdout/stderr from the pseudo tty. */
509: if (dup2(ttyfd, 0) < 0)
510: error("dup2 stdin: %s", strerror(errno));
511: if (dup2(ttyfd, 1) < 0)
512: error("dup2 stdout: %s", strerror(errno));
513: if (dup2(ttyfd, 2) < 0)
514: error("dup2 stderr: %s", strerror(errno));
1.1 markus 515:
516: /* Close the extra descriptor for the pseudo tty. */
517: close(ttyfd);
518:
1.24 markus 519: /* record login, etc. similar to login(1) */
1.41 markus 520: if (!(options.use_login && command == NULL))
521: do_login(s, command);
1.1 markus 522:
523: /* Do common processing for the child, such as execing the command. */
1.60 markus 524: do_child(s, command);
1.1 markus 525: /* NOTREACHED */
526: }
527: if (pid < 0)
528: packet_disconnect("fork failed: %.100s", strerror(errno));
529: s->pid = pid;
530:
531: /* Parent. Close the slave side of the pseudo tty. */
532: close(ttyfd);
533:
534: /*
535: * Create another descriptor of the pty master side for use as the
536: * standard input. We could use the original descriptor, but this
537: * simplifies code in server_loop. The descriptor is bidirectional.
538: */
539: fdout = dup(ptyfd);
540: if (fdout < 0)
541: packet_disconnect("dup #1 failed: %.100s", strerror(errno));
542:
543: /* we keep a reference to the pty master */
544: ptymaster = dup(ptyfd);
545: if (ptymaster < 0)
546: packet_disconnect("dup #2 failed: %.100s", strerror(errno));
547: s->ptymaster = ptymaster;
548:
549: /* Enter interactive session. */
1.47 markus 550: packet_set_interactive(1);
1.2 markus 551: if (compat20) {
552: session_set_fds(s, ptyfd, fdout, -1);
553: } else {
554: server_loop(pid, ptyfd, fdout, -1);
555: /* server_loop _has_ closed ptyfd and fdout. */
1.24 markus 556: }
557: }
558:
1.90 markus 559: /*
560: * This is called to fork and execute a command. If another command is
561: * to be forced, execute that instead.
562: */
563: void
564: do_exec(Session *s, const char *command)
565: {
566: if (forced_command) {
567: original_command = command;
568: command = forced_command;
569: debug("Forced command '%.900s'", command);
570: }
1.163 markus 571:
572: #ifdef GSSAPI
573: if (options.gss_authentication) {
574: temporarily_use_uid(s->pw);
575: ssh_gssapi_storecreds();
576: restore_uid();
577: }
578: #endif
1.90 markus 579:
580: if (s->ttyfd != -1)
581: do_exec_pty(s, command);
582: else
583: do_exec_no_pty(s, command);
584:
1.92 markus 585: original_command = NULL;
1.90 markus 586: }
587:
588:
1.24 markus 589: /* administrative, login(1)-like work */
590: void
1.41 markus 591: do_login(Session *s, const char *command)
1.24 markus 592: {
593: char *time_string;
594: socklen_t fromlen;
595: struct sockaddr_storage from;
596: struct passwd * pw = s->pw;
597: pid_t pid = getpid();
598:
599: /*
600: * Get IP address of client. If the connection is not a socket, let
601: * the address be 0.0.0.0.
602: */
603: memset(&from, 0, sizeof(from));
1.148 stevesk 604: fromlen = sizeof(from);
1.24 markus 605: if (packet_connection_is_on_socket()) {
606: if (getpeername(packet_get_connection_in(),
1.112 deraadt 607: (struct sockaddr *) & from, &fromlen) < 0) {
1.24 markus 608: debug("getpeername: %.100s", strerror(errno));
1.165 markus 609: cleanup_exit(255);
1.24 markus 610: }
611: }
1.25 markus 612:
1.24 markus 613: /* Record that there was a login on that tty from the remote host. */
1.133 markus 614: if (!use_privsep)
615: record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
616: get_remote_name_or_ip(utmp_len,
1.158 markus 617: options.use_dns),
1.148 stevesk 618: (struct sockaddr *)&from, fromlen);
1.24 markus 619:
1.73 djm 620: if (check_quietlogin(s, command))
1.24 markus 621: return;
1.73 djm 622:
1.134 markus 623: if (options.print_lastlog && s->last_login_time != 0) {
624: time_string = ctime(&s->last_login_time);
1.24 markus 625: if (strchr(time_string, '\n'))
626: *strchr(time_string, '\n') = 0;
1.134 markus 627: if (strcmp(s->hostname, "") == 0)
1.24 markus 628: printf("Last login: %s\r\n", time_string);
629: else
1.134 markus 630: printf("Last login: %s from %s\r\n", time_string,
631: s->hostname);
1.24 markus 632: }
1.73 djm 633:
634: do_motd();
635: }
636:
637: /*
638: * Display the message of the day.
639: */
640: void
641: do_motd(void)
642: {
643: FILE *f;
644: char buf[256];
645:
1.24 markus 646: if (options.print_motd) {
1.28 millert 647: #ifdef HAVE_LOGIN_CAP
648: f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
649: "/etc/motd"), "r");
650: #else
1.24 markus 651: f = fopen("/etc/motd", "r");
1.28 millert 652: #endif
1.24 markus 653: if (f) {
654: while (fgets(buf, sizeof(buf), f))
655: fputs(buf, stdout);
656: fclose(f);
657: }
1.2 markus 658: }
1.73 djm 659: }
660:
661:
662: /*
663: * Check for quiet login, either .hushlogin or command given.
664: */
665: int
666: check_quietlogin(Session *s, const char *command)
667: {
668: char buf[256];
1.96 dugsong 669: struct passwd *pw = s->pw;
1.73 djm 670: struct stat st;
671:
672: /* Return 1 if .hushlogin exists or a command given. */
673: if (command != NULL)
674: return 1;
675: snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
676: #ifdef HAVE_LOGIN_CAP
677: if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
678: return 1;
679: #else
680: if (stat(buf, &st) >= 0)
681: return 1;
682: #endif
683: return 0;
1.1 markus 684: }
685:
686: /*
687: * Sets the value of the given variable in the environment. If the variable
688: * already exists, its value is overriden.
689: */
1.161 markus 690: void
1.45 markus 691: child_set_env(char ***envp, u_int *envsizep, const char *name,
1.112 deraadt 692: const char *value)
1.1 markus 693: {
1.164 markus 694: char **env;
695: u_int envsize;
1.45 markus 696: u_int i, namelen;
1.1 markus 697:
698: /*
699: * Find the slot where the value should be stored. If the variable
700: * already exists, we reuse the slot; otherwise we append a new slot
701: * at the end of the array, expanding if necessary.
702: */
703: env = *envp;
704: namelen = strlen(name);
705: for (i = 0; env[i]; i++)
706: if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
707: break;
708: if (env[i]) {
709: /* Reuse the slot. */
710: xfree(env[i]);
711: } else {
712: /* New variable. Expand if necessary. */
1.164 markus 713: envsize = *envsizep;
714: if (i >= envsize - 1) {
715: if (envsize >= 1000)
716: fatal("child_set_env: too many env vars");
717: envsize += 50;
718: env = (*envp) = xrealloc(env, envsize * sizeof(char *));
719: *envsizep = envsize;
1.1 markus 720: }
721: /* Need to set the NULL pointer at end of array beyond the new slot. */
722: env[i + 1] = NULL;
723: }
724:
725: /* Allocate space and format the variable in the appropriate slot. */
726: env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
727: snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
728: }
729:
730: /*
731: * Reads environment variables from the given file and adds/overrides them
732: * into the environment. If the file does not exist, this does nothing.
733: * Otherwise, it must consist of empty lines, comments (line starts with '#')
734: * and assignments of the form name=value. No other forms are allowed.
735: */
1.94 itojun 736: static void
1.45 markus 737: read_environment_file(char ***env, u_int *envsize,
1.112 deraadt 738: const char *filename)
1.1 markus 739: {
740: FILE *f;
741: char buf[4096];
742: char *cp, *value;
1.142 deraadt 743: u_int lineno = 0;
1.1 markus 744:
745: f = fopen(filename, "r");
746: if (!f)
747: return;
748:
749: while (fgets(buf, sizeof(buf), f)) {
1.142 deraadt 750: if (++lineno > 1000)
751: fatal("Too many lines in environment file %s", filename);
1.1 markus 752: for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
753: ;
754: if (!*cp || *cp == '#' || *cp == '\n')
755: continue;
756: if (strchr(cp, '\n'))
757: *strchr(cp, '\n') = '\0';
758: value = strchr(cp, '=');
759: if (value == NULL) {
1.142 deraadt 760: fprintf(stderr, "Bad line %u in %.100s\n", lineno,
761: filename);
1.1 markus 762: continue;
763: }
1.14 deraadt 764: /*
765: * Replace the equals sign by nul, and advance value to
766: * the value string.
767: */
1.1 markus 768: *value = '\0';
769: value++;
770: child_set_env(env, envsize, cp, value);
771: }
772: fclose(f);
773: }
774:
1.127 markus 775: static char **
776: do_setup_env(Session *s, const char *shell)
1.1 markus 777: {
778: char buf[256];
1.127 markus 779: u_int i, envsize;
1.154 markus 780: char **env, *laddr;
1.127 markus 781: struct passwd *pw = s->pw;
1.1 markus 782:
783: /* Initialize the environment. */
784: envsize = 100;
785: env = xmalloc(envsize * sizeof(char *));
786: env[0] = NULL;
787:
1.161 markus 788: #ifdef GSSAPI
1.168 djm 789: /* Allow any GSSAPI methods that we've used to alter
1.161 markus 790: * the childs environment as they see fit
791: */
792: ssh_gssapi_do_child(&env, &envsize);
793: #endif
794:
1.1 markus 795: if (!options.use_login) {
796: /* Set basic environment. */
1.173 ! djm 797: for (i = 0; i < s->num_env; i++)
! 798: child_set_env(&env, &envsize, s->env[i].name,
! 799: s->env[i].val);
! 800:
1.1 markus 801: child_set_env(&env, &envsize, "USER", pw->pw_name);
802: child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
803: child_set_env(&env, &envsize, "HOME", pw->pw_dir);
1.28 millert 804: #ifdef HAVE_LOGIN_CAP
1.145 markus 805: if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
806: child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
807: else
808: child_set_env(&env, &envsize, "PATH", getenv("PATH"));
1.28 millert 809: #else
1.29 millert 810: child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
1.28 millert 811: #endif
1.1 markus 812:
813: snprintf(buf, sizeof buf, "%.200s/%.50s",
814: _PATH_MAILDIR, pw->pw_name);
815: child_set_env(&env, &envsize, "MAIL", buf);
816:
817: /* Normal systems set SHELL by default. */
818: child_set_env(&env, &envsize, "SHELL", shell);
819: }
820: if (getenv("TZ"))
821: child_set_env(&env, &envsize, "TZ", getenv("TZ"));
822:
823: /* Set custom environment options from RSA authentication. */
1.110 markus 824: if (!options.use_login) {
825: while (custom_environment) {
826: struct envstring *ce = custom_environment;
1.143 deraadt 827: char *str = ce->s;
1.127 markus 828:
1.143 deraadt 829: for (i = 0; str[i] != '=' && str[i]; i++)
1.110 markus 830: ;
1.143 deraadt 831: if (str[i] == '=') {
832: str[i] = 0;
833: child_set_env(&env, &envsize, str, str + i + 1);
1.110 markus 834: }
835: custom_environment = ce->next;
836: xfree(ce->s);
837: xfree(ce);
1.1 markus 838: }
839: }
840:
1.149 stevesk 841: /* SSH_CLIENT deprecated */
1.1 markus 842: snprintf(buf, sizeof buf, "%.50s %d %d",
1.127 markus 843: get_remote_ipaddr(), get_remote_port(), get_local_port());
1.1 markus 844: child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1.149 stevesk 845:
1.154 markus 846: laddr = get_local_ipaddr(packet_get_connection_in());
1.149 stevesk 847: snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
1.154 markus 848: get_remote_ipaddr(), get_remote_port(), laddr, get_local_port());
849: xfree(laddr);
1.149 stevesk 850: child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
1.1 markus 851:
1.60 markus 852: if (s->ttyfd != -1)
853: child_set_env(&env, &envsize, "SSH_TTY", s->tty);
854: if (s->term)
855: child_set_env(&env, &envsize, "TERM", s->term);
856: if (s->display)
857: child_set_env(&env, &envsize, "DISPLAY", s->display);
1.34 markus 858: if (original_command)
859: child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
860: original_command);
1.96 dugsong 861: #ifdef KRB5
862: if (s->authctxt->krb5_ticket_file)
863: child_set_env(&env, &envsize, "KRB5CCNAME",
1.112 deraadt 864: s->authctxt->krb5_ticket_file);
1.96 dugsong 865: #endif
1.136 markus 866: if (auth_sock_name != NULL)
1.1 markus 867: child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1.136 markus 868: auth_sock_name);
1.1 markus 869:
870: /* read $HOME/.ssh/environment. */
1.146 markus 871: if (options.permit_user_env && !options.use_login) {
1.14 deraadt 872: snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
873: pw->pw_dir);
1.1 markus 874: read_environment_file(&env, &envsize, buf);
875: }
876: if (debug_flag) {
877: /* dump the environment */
878: fprintf(stderr, "Environment:\n");
879: for (i = 0; env[i]; i++)
880: fprintf(stderr, " %.200s\n", env[i]);
881: }
1.127 markus 882: return env;
883: }
884:
885: /*
886: * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
887: * first in this order).
888: */
889: static void
890: do_rc_files(Session *s, const char *shell)
891: {
892: FILE *f = NULL;
893: char cmd[1024];
894: int do_xauth;
895: struct stat st;
896:
897: do_xauth =
898: s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
899:
900: /* ignore _PATH_SSH_USER_RC for subsystems */
901: if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
902: snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
903: shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
904: if (debug_flag)
905: fprintf(stderr, "Running %s\n", cmd);
906: f = popen(cmd, "w");
907: if (f) {
908: if (do_xauth)
909: fprintf(f, "%s %s\n", s->auth_proto,
910: s->auth_data);
911: pclose(f);
912: } else
913: fprintf(stderr, "Could not run %s\n",
914: _PATH_SSH_USER_RC);
915: } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
916: if (debug_flag)
917: fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
918: _PATH_SSH_SYSTEM_RC);
919: f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
920: if (f) {
921: if (do_xauth)
922: fprintf(f, "%s %s\n", s->auth_proto,
923: s->auth_data);
924: pclose(f);
925: } else
926: fprintf(stderr, "Could not run %s\n",
927: _PATH_SSH_SYSTEM_RC);
928: } else if (do_xauth && options.xauth_location != NULL) {
929: /* Add authority data to .Xauthority if appropriate. */
930: if (debug_flag) {
931: fprintf(stderr,
1.151 stevesk 932: "Running %.500s remove %.100s\n",
1.165 markus 933: options.xauth_location, s->auth_display);
1.151 stevesk 934: fprintf(stderr,
935: "%.500s add %.100s %.100s %.100s\n",
1.127 markus 936: options.xauth_location, s->auth_display,
937: s->auth_proto, s->auth_data);
938: }
939: snprintf(cmd, sizeof cmd, "%s -q -",
940: options.xauth_location);
941: f = popen(cmd, "w");
942: if (f) {
1.151 stevesk 943: fprintf(f, "remove %s\n",
944: s->auth_display);
1.127 markus 945: fprintf(f, "add %s %s %s\n",
946: s->auth_display, s->auth_proto,
947: s->auth_data);
948: pclose(f);
949: } else {
950: fprintf(stderr, "Could not run %s\n",
951: cmd);
952: }
953: }
954: }
955:
956: static void
957: do_nologin(struct passwd *pw)
958: {
959: FILE *f = NULL;
960: char buf[1024];
961:
962: #ifdef HAVE_LOGIN_CAP
963: if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
964: f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
965: _PATH_NOLOGIN), "r");
966: #else
967: if (pw->pw_uid)
968: f = fopen(_PATH_NOLOGIN, "r");
969: #endif
970: if (f) {
971: /* /etc/nologin exists. Print its contents and exit. */
1.155 itojun 972: logit("User %.100s not allowed because %s exists",
1.150 stevesk 973: pw->pw_name, _PATH_NOLOGIN);
1.127 markus 974: while (fgets(buf, sizeof(buf), f))
975: fputs(buf, stderr);
976: fclose(f);
977: exit(254);
978: }
979: }
980:
981: /* Set login name, uid, gid, and groups. */
1.130 provos 982: void
1.127 markus 983: do_setusercontext(struct passwd *pw)
984: {
985: if (getuid() == 0 || geteuid() == 0) {
986: #ifdef HAVE_LOGIN_CAP
987: if (setusercontext(lc, pw, pw->pw_uid,
988: (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
989: perror("unable to set user context");
990: exit(1);
991: }
992: #else
993: if (setlogin(pw->pw_name) < 0)
994: error("setlogin failed: %s", strerror(errno));
995: if (setgid(pw->pw_gid) < 0) {
996: perror("setgid");
997: exit(1);
998: }
999: /* Initialize the group list. */
1000: if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1001: perror("initgroups");
1002: exit(1);
1003: }
1004: endgrent();
1005:
1006: /* Permanently switch to the desired uid. */
1007: permanently_set_uid(pw);
1008: #endif
1009: }
1010: if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1011: fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1012: }
1013:
1.131 markus 1014: static void
1.172 markus 1015: do_pwchange(Session *s)
1016: {
1017: fprintf(stderr, "WARNING: Your password has expired.\n");
1018: if (s->ttyfd != -1) {
1019: fprintf(stderr,
1020: "You must change your password now and login again!\n");
1021: execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL);
1022: perror("passwd");
1023: } else {
1024: fprintf(stderr,
1025: "Password change required but no TTY available.\n");
1026: }
1027: exit(1);
1028: }
1029:
1030: static void
1.130 provos 1031: launch_login(struct passwd *pw, const char *hostname)
1032: {
1033: /* Launch login(1). */
1034:
1035: execl("/usr/bin/login", "login", "-h", hostname,
1036: "-p", "-f", "--", pw->pw_name, (char *)NULL);
1037:
1038: /* Login couldn't be executed, die. */
1039:
1040: perror("login");
1041: exit(1);
1042: }
1043:
1.172 markus 1044: static void
1045: child_close_fds(void)
1046: {
1047: int i;
1048:
1049: if (packet_get_connection_in() == packet_get_connection_out())
1050: close(packet_get_connection_in());
1051: else {
1052: close(packet_get_connection_in());
1053: close(packet_get_connection_out());
1054: }
1055: /*
1056: * Close all descriptors related to channels. They will still remain
1057: * open in the parent.
1058: */
1059: /* XXX better use close-on-exec? -markus */
1060: channel_close_all();
1061:
1062: /*
1063: * Close any extra file descriptors. Note that there may still be
1064: * descriptors left by system functions. They will be closed later.
1065: */
1066: endpwent();
1067:
1068: /*
1069: * Close any extra open file descriptors so that we don\'t have them
1070: * hanging around in clients. Note that we want to do this after
1071: * initgroups, because at least on Solaris 2.3 it leaves file
1072: * descriptors open.
1073: */
1074: for (i = 3; i < 64; i++)
1075: close(i);
1076: }
1077:
1.127 markus 1078: /*
1079: * Performs common processing for the child, such as setting up the
1080: * environment, closing extra file descriptors, setting the user and group
1081: * ids, and executing the command or shell.
1082: */
1083: void
1084: do_child(Session *s, const char *command)
1085: {
1086: extern char **environ;
1087: char **env;
1088: char *argv[10];
1089: const char *shell, *shell0, *hostname = NULL;
1090: struct passwd *pw = s->pw;
1091:
1092: /* remove hostkey from the child's memory */
1093: destroy_sensitive_data();
1094:
1.172 markus 1095: /* Force a password change */
1096: if (s->authctxt->force_pwchange) {
1097: do_setusercontext(pw);
1098: child_close_fds();
1099: do_pwchange(s);
1100: exit(1);
1101: }
1102:
1.127 markus 1103: /* login(1) is only called if we execute the login shell */
1104: if (options.use_login && command != NULL)
1105: options.use_login = 0;
1106:
1107: /*
1108: * Login(1) does this as well, and it needs uid 0 for the "-h"
1109: * switch, so we let login(1) to this for us.
1110: */
1111: if (!options.use_login) {
1112: do_nologin(pw);
1113: do_setusercontext(pw);
1114: }
1115:
1116: /*
1117: * Get the shell from the password data. An empty shell field is
1118: * legal, and means /bin/sh.
1119: */
1120: shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1.152 markus 1121:
1122: /*
1123: * Make sure $SHELL points to the shell from the password file,
1124: * even if shell is overridden from login.conf
1125: */
1126: env = do_setup_env(s, shell);
1127:
1.127 markus 1128: #ifdef HAVE_LOGIN_CAP
1129: shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1130: #endif
1131:
1.26 millert 1132: /* we have to stash the hostname before we close our socket. */
1133: if (options.use_login)
1.70 stevesk 1134: hostname = get_remote_name_or_ip(utmp_len,
1.158 markus 1135: options.use_dns);
1.1 markus 1136: /*
1137: * Close the connection descriptors; note that this is the child, and
1138: * the server will still have the socket open, and it is important
1139: * that we do not shutdown it. Note that the descriptors cannot be
1140: * closed before building the environment, as we call
1141: * get_remote_ipaddr there.
1142: */
1.172 markus 1143: child_close_fds();
1.1 markus 1144:
1145: /*
1.125 deraadt 1146: * Must take new environment into use so that .ssh/rc,
1147: * /etc/ssh/sshrc and xauth are run in the proper environment.
1.1 markus 1148: */
1149: environ = env;
1.170 jakob 1150:
1151: #ifdef KRB5
1152: /*
1153: * At this point, we check to see if AFS is active and if we have
1154: * a valid Kerberos 5 TGT. If so, it seems like a good idea to see
1155: * if we can (and need to) extend the ticket into an AFS token. If
1156: * we don't do this, we run into potential problems if the user's
1157: * home directory is in AFS and it's not world-readable.
1158: */
1159:
1160: if (options.kerberos_get_afs_token && k_hasafs() &&
1161: (s->authctxt->krb5_ctx != NULL)) {
1162: char cell[64];
1163:
1164: debug("Getting AFS token");
1165:
1166: k_setpag();
1167:
1168: if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1169: krb5_afslog(s->authctxt->krb5_ctx,
1170: s->authctxt->krb5_fwd_ccache, cell, NULL);
1171:
1172: krb5_afslog_home(s->authctxt->krb5_ctx,
1173: s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir);
1174: }
1175: #endif
1.104 markus 1176:
1177: /* Change current directory to the user\'s home directory. */
1178: if (chdir(pw->pw_dir) < 0) {
1179: fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1180: pw->pw_dir, strerror(errno));
1181: #ifdef HAVE_LOGIN_CAP
1182: if (login_getcapbool(lc, "requirehome", 0))
1183: exit(1);
1184: #endif
1185: }
1.1 markus 1186:
1.127 markus 1187: if (!options.use_login)
1188: do_rc_files(s, shell);
1.67 markus 1189:
1190: /* restore SIGPIPE for child */
1191: signal(SIGPIPE, SIG_DFL);
1192:
1.127 markus 1193: if (options.use_login) {
1.130 provos 1194: launch_login(pw, hostname);
1195: /* NEVERREACHED */
1.127 markus 1196: }
1197:
1198: /* Get the last component of the shell name. */
1199: if ((shell0 = strrchr(shell, '/')) != NULL)
1200: shell0++;
1201: else
1202: shell0 = shell;
1203:
1.1 markus 1204: /*
1205: * If we have no command, execute the shell. In this case, the shell
1206: * name to be passed in argv[0] is preceded by '-' to indicate that
1207: * this is a login shell.
1208: */
1209: if (!command) {
1.127 markus 1210: char argv0[256];
1.1 markus 1211:
1.127 markus 1212: /* Start the shell. Set initial character to '-'. */
1213: argv0[0] = '-';
1.1 markus 1214:
1.127 markus 1215: if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1.128 markus 1216: >= sizeof(argv0) - 1) {
1.127 markus 1217: errno = EINVAL;
1.1 markus 1218: perror(shell);
1219: exit(1);
1.127 markus 1220: }
1.1 markus 1221:
1.127 markus 1222: /* Execute the shell. */
1223: argv[0] = argv0;
1224: argv[1] = NULL;
1225: execve(shell, argv, env);
1226:
1227: /* Executing the shell failed. */
1228: perror(shell);
1229: exit(1);
1.1 markus 1230: }
1231: /*
1232: * Execute the command using the user's shell. This uses the -c
1233: * option to execute the command.
1234: */
1.127 markus 1235: argv[0] = (char *) shell0;
1.1 markus 1236: argv[1] = "-c";
1237: argv[2] = (char *) command;
1238: argv[3] = NULL;
1239: execve(shell, argv, env);
1240: perror(shell);
1241: exit(1);
1242: }
1243:
1244: Session *
1245: session_new(void)
1246: {
1247: int i;
1248: static int did_init = 0;
1249: if (!did_init) {
1250: debug("session_new: init");
1.112 deraadt 1251: for (i = 0; i < MAX_SESSIONS; i++) {
1.1 markus 1252: sessions[i].used = 0;
1253: }
1254: did_init = 1;
1255: }
1.112 deraadt 1256: for (i = 0; i < MAX_SESSIONS; i++) {
1.1 markus 1257: Session *s = &sessions[i];
1258: if (! s->used) {
1.68 djm 1259: memset(s, 0, sizeof(*s));
1.1 markus 1260: s->chanid = -1;
1261: s->ptyfd = -1;
1262: s->ttyfd = -1;
1263: s->used = 1;
1.85 markus 1264: s->self = i;
1.1 markus 1265: debug("session_new: session %d", i);
1266: return s;
1267: }
1268: }
1269: return NULL;
1270: }
1271:
1.94 itojun 1272: static void
1.1 markus 1273: session_dump(void)
1274: {
1275: int i;
1.112 deraadt 1276: for (i = 0; i < MAX_SESSIONS; i++) {
1.1 markus 1277: Session *s = &sessions[i];
1.137 mpech 1278: debug("dump: used %d session %d %p channel %d pid %ld",
1.1 markus 1279: s->used,
1280: s->self,
1281: s,
1282: s->chanid,
1.137 mpech 1283: (long)s->pid);
1.1 markus 1284: }
1285: }
1286:
1.2 markus 1287: int
1.97 markus 1288: session_open(Authctxt *authctxt, int chanid)
1.2 markus 1289: {
1290: Session *s = session_new();
1291: debug("session_open: channel %d", chanid);
1292: if (s == NULL) {
1293: error("no more sessions");
1294: return 0;
1295: }
1.97 markus 1296: s->authctxt = authctxt;
1297: s->pw = authctxt->pw;
1.167 djm 1298: if (s->pw == NULL || !authctxt->valid)
1.54 stevesk 1299: fatal("no user for session %d", s->self);
1.2 markus 1300: debug("session_open: session %d: link with channel %d", s->self, chanid);
1301: s->chanid = chanid;
1302: return 1;
1303: }
1304:
1.130 provos 1305: Session *
1306: session_by_tty(char *tty)
1307: {
1308: int i;
1309: for (i = 0; i < MAX_SESSIONS; i++) {
1310: Session *s = &sessions[i];
1311: if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1312: debug("session_by_tty: session %d tty %s", i, tty);
1313: return s;
1314: }
1315: }
1316: debug("session_by_tty: unknown tty %.100s", tty);
1317: session_dump();
1318: return NULL;
1319: }
1320:
1.94 itojun 1321: static Session *
1.2 markus 1322: session_by_channel(int id)
1323: {
1324: int i;
1.112 deraadt 1325: for (i = 0; i < MAX_SESSIONS; i++) {
1.2 markus 1326: Session *s = &sessions[i];
1327: if (s->used && s->chanid == id) {
1328: debug("session_by_channel: session %d channel %d", i, id);
1329: return s;
1330: }
1331: }
1332: debug("session_by_channel: unknown channel %d", id);
1333: session_dump();
1334: return NULL;
1335: }
1336:
1.94 itojun 1337: static Session *
1.2 markus 1338: session_by_pid(pid_t pid)
1339: {
1340: int i;
1.137 mpech 1341: debug("session_by_pid: pid %ld", (long)pid);
1.112 deraadt 1342: for (i = 0; i < MAX_SESSIONS; i++) {
1.2 markus 1343: Session *s = &sessions[i];
1344: if (s->used && s->pid == pid)
1345: return s;
1346: }
1.137 mpech 1347: error("session_by_pid: unknown pid %ld", (long)pid);
1.2 markus 1348: session_dump();
1349: return NULL;
1350: }
1351:
1.94 itojun 1352: static int
1.2 markus 1353: session_window_change_req(Session *s)
1354: {
1355: s->col = packet_get_int();
1356: s->row = packet_get_int();
1357: s->xpixel = packet_get_int();
1358: s->ypixel = packet_get_int();
1.116 markus 1359: packet_check_eom();
1.2 markus 1360: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1361: return 1;
1362: }
1363:
1.94 itojun 1364: static int
1.2 markus 1365: session_pty_req(Session *s)
1366: {
1.45 markus 1367: u_int len;
1.72 stevesk 1368: int n_bytes;
1.132 markus 1369:
1.86 markus 1370: if (no_pty_flag) {
1371: debug("Allocating a pty not permitted for this authentication.");
1.19 markus 1372: return 0;
1.86 markus 1373: }
1374: if (s->ttyfd != -1) {
1375: packet_disconnect("Protocol error: you already have a pty.");
1.3 markus 1376: return 0;
1.134 markus 1377: }
1378: /* Get the time and hostname when the user last logged in. */
1379: if (options.print_lastlog) {
1380: s->hostname[0] = '\0';
1381: s->last_login_time = get_last_login_time(s->pw->pw_uid,
1382: s->pw->pw_name, s->hostname, sizeof(s->hostname));
1.86 markus 1383: }
1384:
1.2 markus 1385: s->term = packet_get_string(&len);
1.86 markus 1386:
1387: if (compat20) {
1388: s->col = packet_get_int();
1389: s->row = packet_get_int();
1390: } else {
1391: s->row = packet_get_int();
1392: s->col = packet_get_int();
1393: }
1.2 markus 1394: s->xpixel = packet_get_int();
1395: s->ypixel = packet_get_int();
1396:
1397: if (strcmp(s->term, "") == 0) {
1398: xfree(s->term);
1399: s->term = NULL;
1400: }
1.86 markus 1401:
1.2 markus 1402: /* Allocate a pty and open it. */
1.86 markus 1403: debug("Allocating pty.");
1.130 provos 1404: if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) {
1.86 markus 1405: if (s->term)
1406: xfree(s->term);
1.2 markus 1407: s->term = NULL;
1408: s->ptyfd = -1;
1409: s->ttyfd = -1;
1410: error("session_pty_req: session %d alloc failed", s->self);
1.3 markus 1411: return 0;
1.2 markus 1412: }
1413: debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1.86 markus 1414:
1415: /* for SSH1 the tty modes length is not given */
1416: if (!compat20)
1417: n_bytes = packet_remaining();
1418: tty_parse_modes(s->ttyfd, &n_bytes);
1419:
1.130 provos 1420: if (!use_privsep)
1421: pty_setowner(s->pw, s->tty);
1.86 markus 1422:
1423: /* Set window size from the packet. */
1.2 markus 1424: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1425:
1.116 markus 1426: packet_check_eom();
1.9 markus 1427: session_proctitle(s);
1.2 markus 1428: return 1;
1429: }
1430:
1.94 itojun 1431: static int
1.7 markus 1432: session_subsystem_req(Session *s)
1433: {
1.105 markus 1434: struct stat st;
1.45 markus 1435: u_int len;
1.7 markus 1436: int success = 0;
1.105 markus 1437: char *cmd, *subsys = packet_get_string(&len);
1.18 jakob 1438: int i;
1.7 markus 1439:
1.116 markus 1440: packet_check_eom();
1.155 itojun 1441: logit("subsystem request for %.100s", subsys);
1.18 jakob 1442:
1443: for (i = 0; i < options.num_subsystems; i++) {
1.105 markus 1444: if (strcmp(subsys, options.subsystem_name[i]) == 0) {
1445: cmd = options.subsystem_command[i];
1446: if (stat(cmd, &st) < 0) {
1447: error("subsystem: cannot stat %s: %s", cmd,
1448: strerror(errno));
1449: break;
1450: }
1451: debug("subsystem: exec() %s", cmd);
1.64 markus 1452: s->is_subsystem = 1;
1.105 markus 1453: do_exec(s, cmd);
1.18 jakob 1454: success = 1;
1.122 markus 1455: break;
1.18 jakob 1456: }
1457: }
1458:
1459: if (!success)
1.155 itojun 1460: logit("subsystem request for %.100s failed, subsystem not found",
1.105 markus 1461: subsys);
1.7 markus 1462:
1463: xfree(subsys);
1464: return success;
1465: }
1466:
1.94 itojun 1467: static int
1.7 markus 1468: session_x11_req(Session *s)
1469: {
1.81 markus 1470: int success;
1.7 markus 1471:
1472: s->single_connection = packet_get_char();
1473: s->auth_proto = packet_get_string(NULL);
1474: s->auth_data = packet_get_string(NULL);
1475: s->screen = packet_get_int();
1.116 markus 1476: packet_check_eom();
1.7 markus 1477:
1.81 markus 1478: success = session_setup_x11fwd(s);
1479: if (!success) {
1.7 markus 1480: xfree(s->auth_proto);
1481: xfree(s->auth_data);
1.84 markus 1482: s->auth_proto = NULL;
1483: s->auth_data = NULL;
1.7 markus 1484: }
1.81 markus 1485: return success;
1.7 markus 1486: }
1487:
1.94 itojun 1488: static int
1.19 markus 1489: session_shell_req(Session *s)
1490: {
1.116 markus 1491: packet_check_eom();
1.90 markus 1492: do_exec(s, NULL);
1.19 markus 1493: return 1;
1494: }
1495:
1.94 itojun 1496: static int
1.19 markus 1497: session_exec_req(Session *s)
1498: {
1.45 markus 1499: u_int len;
1.19 markus 1500: char *command = packet_get_string(&len);
1.116 markus 1501: packet_check_eom();
1.90 markus 1502: do_exec(s, command);
1.92 markus 1503: xfree(command);
1.19 markus 1504: return 1;
1505: }
1506:
1.94 itojun 1507: static int
1.157 markus 1508: session_break_req(Session *s)
1509: {
1510: u_int break_length;
1511:
1.160 markus 1512: break_length = packet_get_int(); /* ignored */
1.157 markus 1513: packet_check_eom();
1514:
1.160 markus 1515: if (s->ttyfd == -1 ||
1516: tcsendbreak(s->ttyfd, 0) < 0)
1.157 markus 1517: return 0;
1518: return 1;
1519: }
1520:
1521: static int
1.173 ! djm 1522: session_env_req(Session *s)
! 1523: {
! 1524: char *name, *val;
! 1525: u_int name_len, val_len, i;
! 1526:
! 1527: name = packet_get_string(&name_len);
! 1528: val = packet_get_string(&val_len);
! 1529: packet_check_eom();
! 1530:
! 1531: /* Don't set too many environment variables */
! 1532: if (s->num_env > 128) {
! 1533: debug2("Ignoring env request %s: too many env vars", name);
! 1534: goto fail;
! 1535: }
! 1536:
! 1537: for (i = 0; i < options.num_accept_env; i++) {
! 1538: if (match_pattern(name, options.accept_env[i])) {
! 1539: debug2("Setting env %d: %s=%s", s->num_env, name, val);
! 1540: s->env = xrealloc(s->env, sizeof(*s->env) *
! 1541: (s->num_env + 1));
! 1542: s->env[s->num_env].name = name;
! 1543: s->env[s->num_env].val = val;
! 1544: s->num_env++;
! 1545: return (1);
! 1546: }
! 1547: }
! 1548: debug2("Ignoring env request %s: disallowed name", name);
! 1549:
! 1550: fail:
! 1551: xfree(name);
! 1552: xfree(val);
! 1553: return (0);
! 1554: }
! 1555:
! 1556: static int
1.43 markus 1557: session_auth_agent_req(Session *s)
1558: {
1559: static int called = 0;
1.116 markus 1560: packet_check_eom();
1.44 markus 1561: if (no_agent_forwarding_flag) {
1562: debug("session_auth_agent_req: no_agent_forwarding_flag");
1563: return 0;
1564: }
1.43 markus 1565: if (called) {
1566: return 0;
1567: } else {
1568: called = 1;
1569: return auth_input_request_forwarding(s->pw);
1570: }
1571: }
1572:
1.123 markus 1573: int
1574: session_input_channel_req(Channel *c, const char *rtype)
1.2 markus 1575: {
1576: int success = 0;
1577: Session *s;
1578:
1.123 markus 1579: if ((s = session_by_channel(c->self)) == NULL) {
1.155 itojun 1580: logit("session_input_channel_req: no session %d req %.100s",
1.123 markus 1581: c->self, rtype);
1582: return 0;
1583: }
1584: debug("session_input_channel_req: session %d req %s", s->self, rtype);
1.2 markus 1585:
1586: /*
1.64 markus 1587: * a session is in LARVAL state until a shell, a command
1588: * or a subsystem is executed
1.2 markus 1589: */
1590: if (c->type == SSH_CHANNEL_LARVAL) {
1591: if (strcmp(rtype, "shell") == 0) {
1.19 markus 1592: success = session_shell_req(s);
1.2 markus 1593: } else if (strcmp(rtype, "exec") == 0) {
1.19 markus 1594: success = session_exec_req(s);
1.2 markus 1595: } else if (strcmp(rtype, "pty-req") == 0) {
1.3 markus 1596: success = session_pty_req(s);
1.7 markus 1597: } else if (strcmp(rtype, "x11-req") == 0) {
1598: success = session_x11_req(s);
1.43 markus 1599: } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1600: success = session_auth_agent_req(s);
1.7 markus 1601: } else if (strcmp(rtype, "subsystem") == 0) {
1602: success = session_subsystem_req(s);
1.157 markus 1603: } else if (strcmp(rtype, "break") == 0) {
1604: success = session_break_req(s);
1.173 ! djm 1605: } else if (strcmp(rtype, "env") == 0) {
! 1606: success = session_env_req(s);
1.2 markus 1607: }
1608: }
1609: if (strcmp(rtype, "window-change") == 0) {
1610: success = session_window_change_req(s);
1611: }
1.123 markus 1612: return success;
1.2 markus 1613: }
1614:
1615: void
1616: session_set_fds(Session *s, int fdin, int fdout, int fderr)
1617: {
1618: if (!compat20)
1619: fatal("session_set_fds: called for proto != 2.0");
1620: /*
1621: * now that have a child and a pipe to the child,
1622: * we can activate our channel and register the fd's
1623: */
1624: if (s->chanid == -1)
1625: fatal("no channel for session %d", s->self);
1626: channel_set_fds(s->chanid,
1627: fdout, fdin, fderr,
1.42 markus 1628: fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1.126 markus 1629: 1,
1630: CHAN_SES_WINDOW_DEFAULT);
1.2 markus 1631: }
1632:
1.85 markus 1633: /*
1634: * Function to perform pty cleanup. Also called if we get aborted abnormally
1635: * (e.g., due to a dropped connection).
1636: */
1.130 provos 1637: void
1.165 markus 1638: session_pty_cleanup2(Session *s)
1.1 markus 1639: {
1.85 markus 1640: if (s == NULL) {
1641: error("session_pty_cleanup: no session");
1642: return;
1643: }
1644: if (s->ttyfd == -1)
1.1 markus 1645: return;
1646:
1.54 stevesk 1647: debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
1.1 markus 1648:
1649: /* Record that the user has logged out. */
1.85 markus 1650: if (s->pid != 0)
1651: record_logout(s->pid, s->tty);
1.1 markus 1652:
1653: /* Release the pseudo-tty. */
1.130 provos 1654: if (getuid() == 0)
1655: pty_release(s->tty);
1.1 markus 1656:
1657: /*
1658: * Close the server side of the socket pairs. We must do this after
1659: * the pty cleanup, so that another process doesn't get this pty
1660: * while we're still cleaning up.
1661: */
1662: if (close(s->ptymaster) < 0)
1.130 provos 1663: error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
1.108 markus 1664:
1665: /* unlink pty from session */
1666: s->ttyfd = -1;
1.2 markus 1667: }
1668:
1.130 provos 1669: void
1.165 markus 1670: session_pty_cleanup(Session *s)
1.130 provos 1671: {
1.165 markus 1672: PRIVSEP(session_pty_cleanup2(s));
1.130 provos 1673: }
1674:
1.147 markus 1675: static char *
1676: sig2name(int sig)
1677: {
1678: #define SSH_SIG(x) if (sig == SIG ## x) return #x
1679: SSH_SIG(ABRT);
1680: SSH_SIG(ALRM);
1681: SSH_SIG(FPE);
1682: SSH_SIG(HUP);
1683: SSH_SIG(ILL);
1684: SSH_SIG(INT);
1685: SSH_SIG(KILL);
1686: SSH_SIG(PIPE);
1687: SSH_SIG(QUIT);
1688: SSH_SIG(SEGV);
1689: SSH_SIG(TERM);
1690: SSH_SIG(USR1);
1691: SSH_SIG(USR2);
1692: #undef SSH_SIG
1693: return "SIG@openssh.com";
1694: }
1695:
1.94 itojun 1696: static void
1.2 markus 1697: session_exit_message(Session *s, int status)
1698: {
1699: Channel *c;
1.124 markus 1700:
1701: if ((c = channel_lookup(s->chanid)) == NULL)
1.85 markus 1702: fatal("session_exit_message: session %d: no channel %d",
1.2 markus 1703: s->self, s->chanid);
1.137 mpech 1704: debug("session_exit_message: session %d channel %d pid %ld",
1705: s->self, s->chanid, (long)s->pid);
1.2 markus 1706:
1707: if (WIFEXITED(status)) {
1.124 markus 1708: channel_request_start(s->chanid, "exit-status", 0);
1.2 markus 1709: packet_put_int(WEXITSTATUS(status));
1710: packet_send();
1711: } else if (WIFSIGNALED(status)) {
1.124 markus 1712: channel_request_start(s->chanid, "exit-signal", 0);
1.147 markus 1713: packet_put_cstring(sig2name(WTERMSIG(status)));
1.2 markus 1714: packet_put_char(WCOREDUMP(status));
1715: packet_put_cstring("");
1716: packet_put_cstring("");
1717: packet_send();
1718: } else {
1719: /* Some weird exit cause. Just exit. */
1720: packet_disconnect("wait returned status %04x.", status);
1721: }
1722:
1723: /* disconnect channel */
1724: debug("session_exit_message: release channel %d", s->chanid);
1725: channel_cancel_cleanup(s->chanid);
1.5 markus 1726: /*
1727: * emulate a write failure with 'chan_write_failed', nobody will be
1728: * interested in data we write.
1729: * Note that we must not call 'chan_read_failed', since there could
1730: * be some more data waiting in the pipe.
1731: */
1.8 markus 1732: if (c->ostate != CHAN_OUTPUT_CLOSED)
1733: chan_write_failed(c);
1.2 markus 1734: s->chanid = -1;
1735: }
1736:
1.130 provos 1737: void
1.85 markus 1738: session_close(Session *s)
1.2 markus 1739: {
1.173 ! djm 1740: int i;
! 1741:
1.137 mpech 1742: debug("session_close: session %d pid %ld", s->self, (long)s->pid);
1.165 markus 1743: if (s->ttyfd != -1)
1.85 markus 1744: session_pty_cleanup(s);
1.2 markus 1745: if (s->term)
1746: xfree(s->term);
1747: if (s->display)
1748: xfree(s->display);
1.118 stevesk 1749: if (s->auth_display)
1750: xfree(s->auth_display);
1.2 markus 1751: if (s->auth_data)
1752: xfree(s->auth_data);
1753: if (s->auth_proto)
1754: xfree(s->auth_proto);
1755: s->used = 0;
1.173 ! djm 1756: for (i = 0; i < s->num_env; i++) {
! 1757: xfree(s->env[i].name);
! 1758: xfree(s->env[i].val);
! 1759: }
! 1760: if (s->env != NULL)
! 1761: xfree(s->env);
1.9 markus 1762: session_proctitle(s);
1.2 markus 1763: }
1764:
1765: void
1766: session_close_by_pid(pid_t pid, int status)
1767: {
1768: Session *s = session_by_pid(pid);
1769: if (s == NULL) {
1.137 mpech 1770: debug("session_close_by_pid: no session for pid %ld",
1771: (long)pid);
1.2 markus 1772: return;
1773: }
1774: if (s->chanid != -1)
1775: session_exit_message(s, status);
1776: session_close(s);
1.98 markus 1777: }
1778:
1.2 markus 1779: /*
1780: * this is called when a channel dies before
1781: * the session 'child' itself dies
1782: */
1783: void
1784: session_close_by_channel(int id, void *arg)
1785: {
1786: Session *s = session_by_channel(id);
1787: if (s == NULL) {
1.107 markus 1788: debug("session_close_by_channel: no session for id %d", id);
1.2 markus 1789: return;
1790: }
1.137 mpech 1791: debug("session_close_by_channel: channel %d child %ld",
1792: id, (long)s->pid);
1.107 markus 1793: if (s->pid != 0) {
1794: debug("session_close_by_channel: channel %d: has child", id);
1.108 markus 1795: /*
1796: * delay detach of session, but release pty, since
1797: * the fd's to the child are already closed
1798: */
1.165 markus 1799: if (s->ttyfd != -1)
1.108 markus 1800: session_pty_cleanup(s);
1.107 markus 1801: return;
1802: }
1803: /* detach by removing callback */
1.2 markus 1804: channel_cancel_cleanup(s->chanid);
1805: s->chanid = -1;
1.106 markus 1806: session_close(s);
1807: }
1808:
1809: void
1.130 provos 1810: session_destroy_all(void (*closefunc)(Session *))
1.106 markus 1811: {
1812: int i;
1.112 deraadt 1813: for (i = 0; i < MAX_SESSIONS; i++) {
1.106 markus 1814: Session *s = &sessions[i];
1.130 provos 1815: if (s->used) {
1816: if (closefunc != NULL)
1817: closefunc(s);
1818: else
1819: session_close(s);
1820: }
1.2 markus 1821: }
1.9 markus 1822: }
1823:
1.94 itojun 1824: static char *
1.9 markus 1825: session_tty_list(void)
1826: {
1827: static char buf[1024];
1828: int i;
1829: buf[0] = '\0';
1.112 deraadt 1830: for (i = 0; i < MAX_SESSIONS; i++) {
1.9 markus 1831: Session *s = &sessions[i];
1832: if (s->used && s->ttyfd != -1) {
1833: if (buf[0] != '\0')
1834: strlcat(buf, ",", sizeof buf);
1835: strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
1836: }
1837: }
1838: if (buf[0] == '\0')
1839: strlcpy(buf, "notty", sizeof buf);
1840: return buf;
1841: }
1842:
1843: void
1844: session_proctitle(Session *s)
1845: {
1846: if (s->pw == NULL)
1847: error("no user for session %d", s->self);
1848: else
1849: setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1.81 markus 1850: }
1851:
1852: int
1853: session_setup_x11fwd(Session *s)
1854: {
1855: struct stat st;
1.109 stevesk 1856: char display[512], auth_display[512];
1857: char hostname[MAXHOSTNAMELEN];
1.81 markus 1858:
1859: if (no_x11_forwarding_flag) {
1860: packet_send_debug("X11 forwarding disabled in user configuration file.");
1861: return 0;
1862: }
1863: if (!options.x11_forwarding) {
1864: debug("X11 forwarding disabled in server configuration file.");
1865: return 0;
1866: }
1867: if (!options.xauth_location ||
1868: (stat(options.xauth_location, &st) == -1)) {
1869: packet_send_debug("No xauth program; cannot forward with spoofing.");
1.91 markus 1870: return 0;
1871: }
1872: if (options.use_login) {
1873: packet_send_debug("X11 forwarding disabled; "
1874: "not compatible with UseLogin=yes.");
1.81 markus 1875: return 0;
1876: }
1.87 markus 1877: if (s->display != NULL) {
1.81 markus 1878: debug("X11 display already set.");
1879: return 0;
1880: }
1.140 deraadt 1881: if (x11_create_display_inet(options.x11_display_offset,
1882: options.x11_use_localhost, s->single_connection,
1883: &s->display_number) == -1) {
1.87 markus 1884: debug("x11_create_display_inet failed.");
1.81 markus 1885: return 0;
1886: }
1.109 stevesk 1887:
1888: /* Set up a suitable value for the DISPLAY variable. */
1889: if (gethostname(hostname, sizeof(hostname)) < 0)
1890: fatal("gethostname: %.100s", strerror(errno));
1891: /*
1892: * auth_display must be used as the displayname when the
1893: * authorization entry is added with xauth(1). This will be
1894: * different than the DISPLAY string for localhost displays.
1895: */
1.119 stevesk 1896: if (options.x11_use_localhost) {
1.140 deraadt 1897: snprintf(display, sizeof display, "localhost:%u.%u",
1.109 stevesk 1898: s->display_number, s->screen);
1.140 deraadt 1899: snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
1.118 stevesk 1900: s->display_number, s->screen);
1.109 stevesk 1901: s->display = xstrdup(display);
1.118 stevesk 1902: s->auth_display = xstrdup(auth_display);
1.109 stevesk 1903: } else {
1.140 deraadt 1904: snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
1.109 stevesk 1905: s->display_number, s->screen);
1906: s->display = xstrdup(display);
1.118 stevesk 1907: s->auth_display = xstrdup(display);
1.109 stevesk 1908: }
1909:
1.81 markus 1910: return 1;
1.2 markus 1911: }
1912:
1.94 itojun 1913: static void
1.49 markus 1914: do_authenticated2(Authctxt *authctxt)
1.2 markus 1915: {
1.97 markus 1916: server_loop2(authctxt);
1.165 markus 1917: }
1918:
1919: void
1920: do_cleanup(Authctxt *authctxt)
1921: {
1922: static int called = 0;
1923:
1924: debug("do_cleanup");
1925:
1926: /* no cleanup if we're in the child for login shell */
1927: if (is_child)
1928: return;
1929:
1930: /* avoid double cleanup */
1931: if (called)
1932: return;
1933: called = 1;
1934:
1935: if (authctxt == NULL)
1936: return;
1937: #ifdef KRB5
1938: if (options.kerberos_ticket_cleanup &&
1939: authctxt->krb5_ctx)
1940: krb5_cleanup_proc(authctxt);
1.161 markus 1941: #endif
1.165 markus 1942:
1943: #ifdef GSSAPI
1944: if (compat20 && options.gss_cleanup_creds)
1945: ssh_gssapi_cleanup_creds();
1946: #endif
1947:
1948: /* remove agent socket */
1949: auth_sock_cleanup_proc(authctxt->pw);
1950:
1951: /*
1952: * Cleanup ptys/utmp only if privsep is disabled,
1953: * or if running in monitor.
1954: */
1955: if (!use_privsep || mm_is_monitor())
1956: session_destroy_all(session_pty_cleanup2);
1.1 markus 1957: }
![[BACK]](/icons/back.gif){kind=icon}
Return to session.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh