Annotation of src/usr.bin/ssh/session.c, Revision 1.203
1.203 ! djm 1: /* $OpenBSD: session.c,v 1.202 2006/03/25 13:17:02 djm Exp $ */
1.1 markus 2: /*
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
1.37 deraadt 5: *
6: * As far as I am concerned, the code I have written for this software
7: * can be used freely for any purpose. Any derived versions of this
8: * software must be clearly marked as such, and if the derived work is
9: * incompatible with the protocol description in the RFC file, it must be
10: * called by a name other than "ssh" or "Secure Shell".
11: *
1.2 markus 12: * SSH2 support by Markus Friedl.
1.95 markus 13: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
1.37 deraadt 14: *
15: * Redistribution and use in source and binary forms, with or without
16: * modification, are permitted provided that the following conditions
17: * are met:
18: * 1. Redistributions of source code must retain the above copyright
19: * notice, this list of conditions and the following disclaimer.
20: * 2. Redistributions in binary form must reproduce the above copyright
21: * notice, this list of conditions and the following disclaimer in the
22: * documentation and/or other materials provided with the distribution.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.2 markus 34: */
1.1 markus 35:
36: #include "includes.h"
1.193 stevesk 37:
38: #include <sys/types.h>
39: #include <sys/wait.h>
1.194 stevesk 40: #include <sys/un.h>
1.196 stevesk 41: #include <sys/stat.h>
1.192 stevesk 42:
43: #include <paths.h>
1.195 stevesk 44: #include <signal.h>
1.1 markus 45:
1.51 markus 46: #include "ssh.h"
47: #include "ssh1.h"
48: #include "ssh2.h"
1.1 markus 49: #include "xmalloc.h"
1.59 djm 50: #include "sshpty.h"
1.1 markus 51: #include "packet.h"
52: #include "buffer.h"
1.173 djm 53: #include "match.h"
1.1 markus 54: #include "uidswap.h"
55: #include "compat.h"
1.78 markus 56: #include "channels.h"
1.2 markus 57: #include "bufaux.h"
58: #include "auth.h"
1.19 markus 59: #include "auth-options.h"
1.50 markus 60: #include "pathnames.h"
1.51 markus 61: #include "log.h"
62: #include "servconf.h"
1.59 djm 63: #include "sshlogin.h"
1.51 markus 64: #include "serverloop.h"
65: #include "canohost.h"
1.55 itojun 66: #include "session.h"
1.186 markus 67: #include "kex.h"
1.130 provos 68: #include "monitor_wrap.h"
1.171 markus 69:
70: #ifdef KRB5
71: #include <kafs.h>
72: #endif
1.1 markus 73:
1.161 markus 74: #ifdef GSSAPI
75: #include "ssh-gss.h"
76: #endif
77:
1.1 markus 78: /* func */
79:
80: Session *session_new(void);
1.94 itojun 81: void session_set_fds(Session *, int, int, int);
1.165 markus 82: void session_pty_cleanup(Session *);
1.94 itojun 83: void session_proctitle(Session *);
84: int session_setup_x11fwd(Session *);
85: void do_exec_pty(Session *, const char *);
86: void do_exec_no_pty(Session *, const char *);
87: void do_exec(Session *, const char *);
88: void do_login(Session *, const char *);
89: void do_child(Session *, const char *);
1.73 djm 90: void do_motd(void);
1.94 itojun 91: int check_quietlogin(Session *, const char *);
1.1 markus 92:
1.94 itojun 93: static void do_authenticated1(Authctxt *);
94: static void do_authenticated2(Authctxt *);
95:
96: static int session_pty_req(Session *);
1.65 markus 97:
1.1 markus 98: /* import */
99: extern ServerOptions options;
100: extern char *__progname;
101: extern int log_stderr;
102: extern int debug_flag;
1.45 markus 103: extern u_int utmp_len;
1.21 markus 104: extern int startup_pipe;
1.74 markus 105: extern void destroy_sensitive_data(void);
1.179 dtucker 106: extern Buffer loginmsg;
1.21 markus 107:
1.34 markus 108: /* original command from peer. */
1.92 markus 109: const char *original_command = NULL;
1.34 markus 110:
1.1 markus 111: /* data */
112: #define MAX_SESSIONS 10
113: Session sessions[MAX_SESSIONS];
114:
1.28 millert 115: #ifdef HAVE_LOGIN_CAP
1.129 provos 116: login_cap_t *lc;
1.28 millert 117: #endif
118:
1.165 markus 119: static int is_child = 0;
120:
1.136 markus 121: /* Name and directory of socket for authentication agent forwarding. */
122: static char *auth_sock_name = NULL;
123: static char *auth_sock_dir = NULL;
124:
125: /* removes the agent forwarding socket */
126:
127: static void
1.165 markus 128: auth_sock_cleanup_proc(struct passwd *pw)
1.136 markus 129: {
130: if (auth_sock_name != NULL) {
131: temporarily_use_uid(pw);
132: unlink(auth_sock_name);
133: rmdir(auth_sock_dir);
134: auth_sock_name = NULL;
135: restore_uid();
136: }
137: }
138:
139: static int
140: auth_input_request_forwarding(struct passwd * pw)
141: {
142: Channel *nc;
143: int sock;
144: struct sockaddr_un sunaddr;
145:
146: if (auth_sock_name != NULL) {
147: error("authentication forwarding requested twice.");
148: return 0;
149: }
150:
151: /* Temporarily drop privileged uid for mkdir/bind. */
152: temporarily_use_uid(pw);
153:
154: /* Allocate a buffer for the socket name, and format the name. */
155: auth_sock_name = xmalloc(MAXPATHLEN);
156: auth_sock_dir = xmalloc(MAXPATHLEN);
1.166 markus 157: strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
1.136 markus 158:
159: /* Create private directory for socket */
160: if (mkdtemp(auth_sock_dir) == NULL) {
161: packet_send_debug("Agent forwarding disabled: "
162: "mkdtemp() failed: %.100s", strerror(errno));
163: restore_uid();
164: xfree(auth_sock_name);
165: xfree(auth_sock_dir);
166: auth_sock_name = NULL;
167: auth_sock_dir = NULL;
168: return 0;
169: }
1.137 mpech 170: snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld",
171: auth_sock_dir, (long) getpid());
1.136 markus 172:
173: /* Create the socket. */
174: sock = socket(AF_UNIX, SOCK_STREAM, 0);
175: if (sock < 0)
176: packet_disconnect("socket: %.100s", strerror(errno));
177:
178: /* Bind it to the name. */
179: memset(&sunaddr, 0, sizeof(sunaddr));
180: sunaddr.sun_family = AF_UNIX;
181: strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path));
182:
1.200 deraadt 183: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0)
1.136 markus 184: packet_disconnect("bind: %.100s", strerror(errno));
185:
186: /* Restore the privileged uid. */
187: restore_uid();
188:
189: /* Start listening on the socket. */
1.169 markus 190: if (listen(sock, SSH_LISTEN_BACKLOG) < 0)
1.136 markus 191: packet_disconnect("listen: %.100s", strerror(errno));
192:
193: /* Allocate a channel for the authentication agent socket. */
194: nc = channel_new("auth socket",
195: SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
196: CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
1.156 markus 197: 0, "auth socket", 1);
1.136 markus 198: strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
199: return 1;
200: }
201:
1.179 dtucker 202: static void
203: display_loginmsg(void)
204: {
1.183 djm 205: if (buffer_len(&loginmsg) > 0) {
206: buffer_append(&loginmsg, "\0", 1);
207: printf("%s", (char *)buffer_ptr(&loginmsg));
208: buffer_clear(&loginmsg);
209: }
1.179 dtucker 210: }
1.136 markus 211:
1.65 markus 212: void
213: do_authenticated(Authctxt *authctxt)
214: {
1.153 markus 215: setproctitle("%s", authctxt->pw->pw_name);
216:
1.65 markus 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:
1.165 markus 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();
1.181 markus 245: if (s == NULL) {
246: error("no more sessions");
247: return;
248: }
1.96 dugsong 249: s->authctxt = authctxt;
1.65 markus 250: s->pw = authctxt->pw;
1.28 millert 251:
1.1 markus 252: /*
253: * We stay in this loop until the client requests to execute a shell
254: * or a command.
255: */
256: for (;;) {
1.65 markus 257: success = 0;
1.1 markus 258:
259: /* Get a packet from the client. */
1.117 markus 260: type = packet_read();
1.1 markus 261:
262: /* Process the packet. */
263: switch (type) {
264: case SSH_CMSG_REQUEST_COMPRESSION:
265: compression_level = packet_get_int();
1.116 markus 266: packet_check_eom();
1.1 markus 267: if (compression_level < 1 || compression_level > 9) {
1.180 markus 268: packet_send_debug("Received invalid compression level %d.",
1.112 deraadt 269: compression_level);
1.138 markus 270: break;
271: }
1.186 markus 272: if (options.compression == COMP_NONE) {
1.138 markus 273: debug2("compression disabled");
1.1 markus 274: break;
275: }
276: /* Enable compression after we have responded with SUCCESS. */
277: enable_compression_after_reply = 1;
278: success = 1;
279: break;
280:
281: case SSH_CMSG_REQUEST_PTY:
1.86 markus 282: success = session_pty_req(s);
1.1 markus 283: break;
284:
285: case SSH_CMSG_X11_REQUEST_FORWARDING:
286: s->auth_proto = packet_get_string(&proto_len);
287: s->auth_data = packet_get_string(&data_len);
288:
1.57 markus 289: screen_flag = packet_get_protocol_flags() &
290: SSH_PROTOFLAG_SCREEN_NUMBER;
291: debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
292:
293: if (packet_remaining() == 4) {
294: if (!screen_flag)
295: debug2("Buggy client: "
296: "X11 screen flag missing");
1.1 markus 297: s->screen = packet_get_int();
1.56 markus 298: } else {
1.1 markus 299: s->screen = 0;
1.56 markus 300: }
1.116 markus 301: packet_check_eom();
1.81 markus 302: success = session_setup_x11fwd(s);
303: if (!success) {
304: xfree(s->auth_proto);
305: xfree(s->auth_data);
1.84 markus 306: s->auth_proto = NULL;
307: s->auth_data = NULL;
1.1 markus 308: }
309: break;
310:
311: case SSH_CMSG_AGENT_REQUEST_FORWARDING:
312: if (no_agent_forwarding_flag || compat13) {
313: debug("Authentication agent forwarding not permitted for this authentication.");
314: break;
315: }
316: debug("Received authentication agent forwarding request.");
1.65 markus 317: success = auth_input_request_forwarding(s->pw);
1.1 markus 318: break;
319:
320: case SSH_CMSG_PORT_FORWARD_REQUEST:
321: if (no_port_forwarding_flag) {
322: debug("Port forwarding not permitted for this authentication.");
1.39 markus 323: break;
324: }
325: if (!options.allow_tcp_forwarding) {
326: debug("Port forwarding not permitted.");
1.1 markus 327: break;
328: }
329: debug("Received TCP/IP port forwarding request.");
1.65 markus 330: channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
1.1 markus 331: success = 1;
332: break;
333:
334: case SSH_CMSG_MAX_PACKET_SIZE:
335: if (packet_set_maxsize(packet_get_int()) > 0)
336: success = 1;
337: break;
338:
339: case SSH_CMSG_EXEC_SHELL:
340: case SSH_CMSG_EXEC_CMD:
341: if (type == SSH_CMSG_EXEC_CMD) {
342: command = packet_get_string(&dlen);
343: debug("Exec command '%.500s'", command);
1.92 markus 344: do_exec(s, command);
345: xfree(command);
1.1 markus 346: } else {
1.92 markus 347: do_exec(s, NULL);
1.1 markus 348: }
1.116 markus 349: packet_check_eom();
1.82 markus 350: session_close(s);
1.1 markus 351: return;
352:
353: default:
354: /*
355: * Any unknown messages in this phase are ignored,
356: * and a failure message is returned.
357: */
1.155 itojun 358: logit("Unknown packet type received after authentication: %d", type);
1.1 markus 359: }
360: packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
361: packet_send();
362: packet_write_wait();
363:
364: /* Enable compression now that we have replied if appropriate. */
365: if (enable_compression_after_reply) {
366: enable_compression_after_reply = 0;
367: packet_start_compression(compression_level);
368: }
369: }
370: }
371:
372: /*
373: * This is called to fork and execute a command when we have no tty. This
374: * will call do_child from the child, and server_loop from the parent after
375: * setting up file descriptors and such.
376: */
1.4 markus 377: void
1.63 markus 378: do_exec_no_pty(Session *s, const char *command)
1.1 markus 379: {
1.137 mpech 380: pid_t pid;
1.1 markus 381:
382: int inout[2], err[2];
383: /* Uses socket pairs to communicate with the program. */
384: if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
385: socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
386: packet_disconnect("Could not create socket pairs: %.100s",
387: strerror(errno));
388: if (s == NULL)
389: fatal("do_exec_no_pty: no session");
390:
1.9 markus 391: session_proctitle(s);
1.1 markus 392:
393: /* Fork the child. */
394: if ((pid = fork()) == 0) {
1.165 markus 395: is_child = 1;
1.144 markus 396:
1.1 markus 397: /* Child. Reinitialize the log since the pid has changed. */
398: log_init(__progname, options.log_level, options.log_facility, log_stderr);
399:
400: /*
401: * Create a new session and process group since the 4.4BSD
402: * setlogin() affects the entire process group.
403: */
404: if (setsid() < 0)
405: error("setsid failed: %.100s", strerror(errno));
406:
407: /*
408: * Redirect stdin, stdout, and stderr. Stdin and stdout will
409: * use the same socket, as some programs (particularly rdist)
410: * seem to depend on it.
411: */
412: close(inout[1]);
413: close(err[1]);
414: if (dup2(inout[0], 0) < 0) /* stdin */
415: perror("dup2 stdin");
416: if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
417: perror("dup2 stdout");
418: if (dup2(err[0], 2) < 0) /* stderr */
419: perror("dup2 stderr");
420:
421: /* Do processing for the child (exec command etc). */
1.60 markus 422: do_child(s, command);
1.1 markus 423: /* NOTREACHED */
424: }
425: if (pid < 0)
426: packet_disconnect("fork failed: %.100s", strerror(errno));
427: s->pid = pid;
1.47 markus 428: /* Set interactive/non-interactive mode. */
1.48 markus 429: packet_set_interactive(s->display != NULL);
1.1 markus 430:
431: /* We are the parent. Close the child sides of the socket pairs. */
432: close(inout[0]);
433: close(err[0]);
434:
435: /*
436: * Enter the interactive session. Note: server_loop must be able to
437: * handle the case that fdin and fdout are the same.
438: */
1.2 markus 439: if (compat20) {
1.64 markus 440: session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
1.2 markus 441: } else {
442: server_loop(pid, inout[1], inout[1], err[1]);
443: /* server_loop has closed inout[1] and err[1]. */
444: }
1.1 markus 445: }
446:
447: /*
448: * This is called to fork and execute a command when we have a tty. This
449: * will call do_child from the child, and server_loop from the parent after
450: * setting up file descriptors, controlling tty, updating wtmp, utmp,
451: * lastlog, and other such operations.
452: */
1.4 markus 453: void
1.63 markus 454: do_exec_pty(Session *s, const char *command)
1.1 markus 455: {
456: int fdout, ptyfd, ttyfd, ptymaster;
457: pid_t pid;
458:
459: if (s == NULL)
460: fatal("do_exec_pty: no session");
461: ptyfd = s->ptyfd;
462: ttyfd = s->ttyfd;
463:
464: /* Fork the child. */
465: if ((pid = fork()) == 0) {
1.165 markus 466: is_child = 1;
1.97 markus 467:
1.24 markus 468: /* Child. Reinitialize the log because the pid has changed. */
1.1 markus 469: log_init(__progname, options.log_level, options.log_facility, log_stderr);
470: /* Close the master side of the pseudo tty. */
471: close(ptyfd);
472:
473: /* Make the pseudo tty our controlling tty. */
474: pty_make_controlling_tty(&ttyfd, s->tty);
475:
1.103 markus 476: /* Redirect stdin/stdout/stderr from the pseudo tty. */
477: if (dup2(ttyfd, 0) < 0)
478: error("dup2 stdin: %s", strerror(errno));
479: if (dup2(ttyfd, 1) < 0)
480: error("dup2 stdout: %s", strerror(errno));
481: if (dup2(ttyfd, 2) < 0)
482: error("dup2 stderr: %s", strerror(errno));
1.1 markus 483:
484: /* Close the extra descriptor for the pseudo tty. */
485: close(ttyfd);
486:
1.24 markus 487: /* record login, etc. similar to login(1) */
1.41 markus 488: if (!(options.use_login && command == NULL))
489: do_login(s, command);
1.1 markus 490:
491: /* Do common processing for the child, such as execing the command. */
1.60 markus 492: do_child(s, command);
1.1 markus 493: /* NOTREACHED */
494: }
495: if (pid < 0)
496: packet_disconnect("fork failed: %.100s", strerror(errno));
497: s->pid = pid;
498:
499: /* Parent. Close the slave side of the pseudo tty. */
500: close(ttyfd);
501:
502: /*
503: * Create another descriptor of the pty master side for use as the
504: * standard input. We could use the original descriptor, but this
505: * simplifies code in server_loop. The descriptor is bidirectional.
506: */
507: fdout = dup(ptyfd);
508: if (fdout < 0)
509: packet_disconnect("dup #1 failed: %.100s", strerror(errno));
510:
511: /* we keep a reference to the pty master */
512: ptymaster = dup(ptyfd);
513: if (ptymaster < 0)
514: packet_disconnect("dup #2 failed: %.100s", strerror(errno));
515: s->ptymaster = ptymaster;
516:
517: /* Enter interactive session. */
1.47 markus 518: packet_set_interactive(1);
1.2 markus 519: if (compat20) {
520: session_set_fds(s, ptyfd, fdout, -1);
521: } else {
522: server_loop(pid, ptyfd, fdout, -1);
523: /* server_loop _has_ closed ptyfd and fdout. */
1.24 markus 524: }
525: }
526:
1.90 markus 527: /*
528: * This is called to fork and execute a command. If another command is
529: * to be forced, execute that instead.
530: */
531: void
532: do_exec(Session *s, const char *command)
533: {
534: if (forced_command) {
535: original_command = command;
536: command = forced_command;
537: debug("Forced command '%.900s'", command);
538: }
1.163 markus 539:
540: #ifdef GSSAPI
541: if (options.gss_authentication) {
542: temporarily_use_uid(s->pw);
543: ssh_gssapi_storecreds();
544: restore_uid();
545: }
546: #endif
1.90 markus 547:
548: if (s->ttyfd != -1)
549: do_exec_pty(s, command);
550: else
551: do_exec_no_pty(s, command);
552:
1.92 markus 553: original_command = NULL;
1.179 dtucker 554:
555: /*
556: * Clear loginmsg: it's the child's responsibility to display
557: * it to the user, otherwise multiple sessions may accumulate
558: * multiple copies of the login messages.
559: */
560: buffer_clear(&loginmsg);
1.90 markus 561: }
562:
563:
1.24 markus 564: /* administrative, login(1)-like work */
565: void
1.41 markus 566: do_login(Session *s, const char *command)
1.24 markus 567: {
568: socklen_t fromlen;
569: struct sockaddr_storage from;
570: struct passwd * pw = s->pw;
571: pid_t pid = getpid();
572:
573: /*
574: * Get IP address of client. If the connection is not a socket, let
575: * the address be 0.0.0.0.
576: */
577: memset(&from, 0, sizeof(from));
1.148 stevesk 578: fromlen = sizeof(from);
1.24 markus 579: if (packet_connection_is_on_socket()) {
580: if (getpeername(packet_get_connection_in(),
1.200 deraadt 581: (struct sockaddr *)&from, &fromlen) < 0) {
1.24 markus 582: debug("getpeername: %.100s", strerror(errno));
1.165 markus 583: cleanup_exit(255);
1.24 markus 584: }
585: }
1.25 markus 586:
1.24 markus 587: /* Record that there was a login on that tty from the remote host. */
1.133 markus 588: if (!use_privsep)
589: record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
590: get_remote_name_or_ip(utmp_len,
1.158 markus 591: options.use_dns),
1.148 stevesk 592: (struct sockaddr *)&from, fromlen);
1.24 markus 593:
1.73 djm 594: if (check_quietlogin(s, command))
1.24 markus 595: return;
1.73 djm 596:
1.179 dtucker 597: display_loginmsg();
1.73 djm 598:
599: do_motd();
600: }
601:
602: /*
603: * Display the message of the day.
604: */
605: void
606: do_motd(void)
607: {
608: FILE *f;
609: char buf[256];
610:
1.24 markus 611: if (options.print_motd) {
1.28 millert 612: #ifdef HAVE_LOGIN_CAP
613: f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
614: "/etc/motd"), "r");
615: #else
1.24 markus 616: f = fopen("/etc/motd", "r");
1.28 millert 617: #endif
1.24 markus 618: if (f) {
619: while (fgets(buf, sizeof(buf), f))
620: fputs(buf, stdout);
621: fclose(f);
622: }
1.2 markus 623: }
1.73 djm 624: }
625:
626:
627: /*
628: * Check for quiet login, either .hushlogin or command given.
629: */
630: int
631: check_quietlogin(Session *s, const char *command)
632: {
633: char buf[256];
1.96 dugsong 634: struct passwd *pw = s->pw;
1.73 djm 635: struct stat st;
636:
637: /* Return 1 if .hushlogin exists or a command given. */
638: if (command != NULL)
639: return 1;
640: snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
641: #ifdef HAVE_LOGIN_CAP
642: if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
643: return 1;
644: #else
645: if (stat(buf, &st) >= 0)
646: return 1;
647: #endif
648: return 0;
1.1 markus 649: }
650:
651: /*
652: * Sets the value of the given variable in the environment. If the variable
653: * already exists, its value is overriden.
654: */
1.161 markus 655: void
1.45 markus 656: child_set_env(char ***envp, u_int *envsizep, const char *name,
1.112 deraadt 657: const char *value)
1.1 markus 658: {
1.164 markus 659: char **env;
660: u_int envsize;
1.45 markus 661: u_int i, namelen;
1.1 markus 662:
663: /*
664: * Find the slot where the value should be stored. If the variable
665: * already exists, we reuse the slot; otherwise we append a new slot
666: * at the end of the array, expanding if necessary.
667: */
668: env = *envp;
669: namelen = strlen(name);
670: for (i = 0; env[i]; i++)
671: if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
672: break;
673: if (env[i]) {
674: /* Reuse the slot. */
675: xfree(env[i]);
676: } else {
677: /* New variable. Expand if necessary. */
1.164 markus 678: envsize = *envsizep;
679: if (i >= envsize - 1) {
680: if (envsize >= 1000)
681: fatal("child_set_env: too many env vars");
682: envsize += 50;
1.201 djm 683: env = (*envp) = xrealloc(env, envsize, sizeof(char *));
1.164 markus 684: *envsizep = envsize;
1.1 markus 685: }
686: /* Need to set the NULL pointer at end of array beyond the new slot. */
687: env[i + 1] = NULL;
688: }
689:
690: /* Allocate space and format the variable in the appropriate slot. */
691: env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
692: snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
693: }
694:
695: /*
696: * Reads environment variables from the given file and adds/overrides them
697: * into the environment. If the file does not exist, this does nothing.
698: * Otherwise, it must consist of empty lines, comments (line starts with '#')
699: * and assignments of the form name=value. No other forms are allowed.
700: */
1.94 itojun 701: static void
1.45 markus 702: read_environment_file(char ***env, u_int *envsize,
1.112 deraadt 703: const char *filename)
1.1 markus 704: {
705: FILE *f;
706: char buf[4096];
707: char *cp, *value;
1.142 deraadt 708: u_int lineno = 0;
1.1 markus 709:
710: f = fopen(filename, "r");
711: if (!f)
712: return;
713:
714: while (fgets(buf, sizeof(buf), f)) {
1.142 deraadt 715: if (++lineno > 1000)
716: fatal("Too many lines in environment file %s", filename);
1.1 markus 717: for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
718: ;
719: if (!*cp || *cp == '#' || *cp == '\n')
720: continue;
721: if (strchr(cp, '\n'))
722: *strchr(cp, '\n') = '\0';
723: value = strchr(cp, '=');
724: if (value == NULL) {
1.142 deraadt 725: fprintf(stderr, "Bad line %u in %.100s\n", lineno,
726: filename);
1.1 markus 727: continue;
728: }
1.14 deraadt 729: /*
730: * Replace the equals sign by nul, and advance value to
731: * the value string.
732: */
1.1 markus 733: *value = '\0';
734: value++;
735: child_set_env(env, envsize, cp, value);
736: }
737: fclose(f);
738: }
739:
1.127 markus 740: static char **
741: do_setup_env(Session *s, const char *shell)
1.1 markus 742: {
743: char buf[256];
1.127 markus 744: u_int i, envsize;
1.154 markus 745: char **env, *laddr;
1.127 markus 746: struct passwd *pw = s->pw;
1.1 markus 747:
748: /* Initialize the environment. */
749: envsize = 100;
750: env = xmalloc(envsize * sizeof(char *));
751: env[0] = NULL;
752:
1.161 markus 753: #ifdef GSSAPI
1.168 djm 754: /* Allow any GSSAPI methods that we've used to alter
1.161 markus 755: * the childs environment as they see fit
756: */
757: ssh_gssapi_do_child(&env, &envsize);
758: #endif
759:
1.1 markus 760: if (!options.use_login) {
761: /* Set basic environment. */
1.173 djm 762: for (i = 0; i < s->num_env; i++)
1.178 deraadt 763: child_set_env(&env, &envsize, s->env[i].name,
1.173 djm 764: s->env[i].val);
765:
1.1 markus 766: child_set_env(&env, &envsize, "USER", pw->pw_name);
767: child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
768: child_set_env(&env, &envsize, "HOME", pw->pw_dir);
1.28 millert 769: #ifdef HAVE_LOGIN_CAP
1.145 markus 770: if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
771: child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
772: else
773: child_set_env(&env, &envsize, "PATH", getenv("PATH"));
1.28 millert 774: #else
1.29 millert 775: child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
1.28 millert 776: #endif
1.1 markus 777:
778: snprintf(buf, sizeof buf, "%.200s/%.50s",
779: _PATH_MAILDIR, pw->pw_name);
780: child_set_env(&env, &envsize, "MAIL", buf);
781:
782: /* Normal systems set SHELL by default. */
783: child_set_env(&env, &envsize, "SHELL", shell);
784: }
785: if (getenv("TZ"))
786: child_set_env(&env, &envsize, "TZ", getenv("TZ"));
787:
788: /* Set custom environment options from RSA authentication. */
1.110 markus 789: if (!options.use_login) {
790: while (custom_environment) {
791: struct envstring *ce = custom_environment;
1.143 deraadt 792: char *str = ce->s;
1.127 markus 793:
1.143 deraadt 794: for (i = 0; str[i] != '=' && str[i]; i++)
1.110 markus 795: ;
1.143 deraadt 796: if (str[i] == '=') {
797: str[i] = 0;
798: child_set_env(&env, &envsize, str, str + i + 1);
1.110 markus 799: }
800: custom_environment = ce->next;
801: xfree(ce->s);
802: xfree(ce);
1.1 markus 803: }
804: }
805:
1.149 stevesk 806: /* SSH_CLIENT deprecated */
1.1 markus 807: snprintf(buf, sizeof buf, "%.50s %d %d",
1.127 markus 808: get_remote_ipaddr(), get_remote_port(), get_local_port());
1.1 markus 809: child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1.149 stevesk 810:
1.154 markus 811: laddr = get_local_ipaddr(packet_get_connection_in());
1.149 stevesk 812: snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
1.154 markus 813: get_remote_ipaddr(), get_remote_port(), laddr, get_local_port());
814: xfree(laddr);
1.149 stevesk 815: child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
1.1 markus 816:
1.60 markus 817: if (s->ttyfd != -1)
818: child_set_env(&env, &envsize, "SSH_TTY", s->tty);
819: if (s->term)
820: child_set_env(&env, &envsize, "TERM", s->term);
821: if (s->display)
822: child_set_env(&env, &envsize, "DISPLAY", s->display);
1.34 markus 823: if (original_command)
824: child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
825: original_command);
1.96 dugsong 826: #ifdef KRB5
827: if (s->authctxt->krb5_ticket_file)
828: child_set_env(&env, &envsize, "KRB5CCNAME",
1.112 deraadt 829: s->authctxt->krb5_ticket_file);
1.96 dugsong 830: #endif
1.136 markus 831: if (auth_sock_name != NULL)
1.1 markus 832: child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1.136 markus 833: auth_sock_name);
1.1 markus 834:
835: /* read $HOME/.ssh/environment. */
1.146 markus 836: if (options.permit_user_env && !options.use_login) {
1.14 deraadt 837: snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
838: pw->pw_dir);
1.1 markus 839: read_environment_file(&env, &envsize, buf);
840: }
841: if (debug_flag) {
842: /* dump the environment */
843: fprintf(stderr, "Environment:\n");
844: for (i = 0; env[i]; i++)
845: fprintf(stderr, " %.200s\n", env[i]);
846: }
1.127 markus 847: return env;
848: }
849:
850: /*
851: * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
852: * first in this order).
853: */
854: static void
855: do_rc_files(Session *s, const char *shell)
856: {
857: FILE *f = NULL;
858: char cmd[1024];
859: int do_xauth;
860: struct stat st;
861:
862: do_xauth =
863: s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
864:
865: /* ignore _PATH_SSH_USER_RC for subsystems */
866: if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
867: snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
868: shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
869: if (debug_flag)
870: fprintf(stderr, "Running %s\n", cmd);
871: f = popen(cmd, "w");
872: if (f) {
873: if (do_xauth)
874: fprintf(f, "%s %s\n", s->auth_proto,
875: s->auth_data);
876: pclose(f);
877: } else
878: fprintf(stderr, "Could not run %s\n",
879: _PATH_SSH_USER_RC);
880: } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
881: if (debug_flag)
882: fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
883: _PATH_SSH_SYSTEM_RC);
884: f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
885: if (f) {
886: if (do_xauth)
887: fprintf(f, "%s %s\n", s->auth_proto,
888: s->auth_data);
889: pclose(f);
890: } else
891: fprintf(stderr, "Could not run %s\n",
892: _PATH_SSH_SYSTEM_RC);
893: } else if (do_xauth && options.xauth_location != NULL) {
894: /* Add authority data to .Xauthority if appropriate. */
895: if (debug_flag) {
896: fprintf(stderr,
1.151 stevesk 897: "Running %.500s remove %.100s\n",
1.165 markus 898: options.xauth_location, s->auth_display);
1.151 stevesk 899: fprintf(stderr,
900: "%.500s add %.100s %.100s %.100s\n",
1.127 markus 901: options.xauth_location, s->auth_display,
902: s->auth_proto, s->auth_data);
903: }
904: snprintf(cmd, sizeof cmd, "%s -q -",
905: options.xauth_location);
906: f = popen(cmd, "w");
907: if (f) {
1.151 stevesk 908: fprintf(f, "remove %s\n",
909: s->auth_display);
1.127 markus 910: fprintf(f, "add %s %s %s\n",
911: s->auth_display, s->auth_proto,
912: s->auth_data);
913: pclose(f);
914: } else {
915: fprintf(stderr, "Could not run %s\n",
916: cmd);
917: }
918: }
919: }
920:
921: static void
922: do_nologin(struct passwd *pw)
923: {
924: FILE *f = NULL;
925: char buf[1024];
926:
927: #ifdef HAVE_LOGIN_CAP
928: if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
929: f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
930: _PATH_NOLOGIN), "r");
931: #else
932: if (pw->pw_uid)
933: f = fopen(_PATH_NOLOGIN, "r");
934: #endif
935: if (f) {
936: /* /etc/nologin exists. Print its contents and exit. */
1.155 itojun 937: logit("User %.100s not allowed because %s exists",
1.150 stevesk 938: pw->pw_name, _PATH_NOLOGIN);
1.127 markus 939: while (fgets(buf, sizeof(buf), f))
940: fputs(buf, stderr);
941: fclose(f);
942: exit(254);
943: }
944: }
945:
946: /* Set login name, uid, gid, and groups. */
1.130 provos 947: void
1.127 markus 948: do_setusercontext(struct passwd *pw)
949: {
950: if (getuid() == 0 || geteuid() == 0) {
951: #ifdef HAVE_LOGIN_CAP
952: if (setusercontext(lc, pw, pw->pw_uid,
953: (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
954: perror("unable to set user context");
955: exit(1);
956: }
957: #else
958: if (setlogin(pw->pw_name) < 0)
959: error("setlogin failed: %s", strerror(errno));
960: if (setgid(pw->pw_gid) < 0) {
961: perror("setgid");
962: exit(1);
963: }
964: /* Initialize the group list. */
965: if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
966: perror("initgroups");
967: exit(1);
968: }
969: endgrent();
970:
971: /* Permanently switch to the desired uid. */
972: permanently_set_uid(pw);
973: #endif
974: }
975: if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
976: fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
977: }
978:
1.131 markus 979: static void
1.172 markus 980: do_pwchange(Session *s)
981: {
1.179 dtucker 982: fflush(NULL);
1.172 markus 983: fprintf(stderr, "WARNING: Your password has expired.\n");
984: if (s->ttyfd != -1) {
1.178 deraadt 985: fprintf(stderr,
1.172 markus 986: "You must change your password now and login again!\n");
987: execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL);
988: perror("passwd");
989: } else {
990: fprintf(stderr,
991: "Password change required but no TTY available.\n");
992: }
993: exit(1);
994: }
995:
996: static void
1.130 provos 997: launch_login(struct passwd *pw, const char *hostname)
998: {
999: /* Launch login(1). */
1000:
1001: execl("/usr/bin/login", "login", "-h", hostname,
1002: "-p", "-f", "--", pw->pw_name, (char *)NULL);
1003:
1004: /* Login couldn't be executed, die. */
1005:
1006: perror("login");
1007: exit(1);
1008: }
1009:
1.172 markus 1010: static void
1011: child_close_fds(void)
1012: {
1013: int i;
1014:
1015: if (packet_get_connection_in() == packet_get_connection_out())
1016: close(packet_get_connection_in());
1017: else {
1018: close(packet_get_connection_in());
1019: close(packet_get_connection_out());
1020: }
1021: /*
1022: * Close all descriptors related to channels. They will still remain
1023: * open in the parent.
1024: */
1025: /* XXX better use close-on-exec? -markus */
1026: channel_close_all();
1027:
1028: /*
1029: * Close any extra file descriptors. Note that there may still be
1030: * descriptors left by system functions. They will be closed later.
1031: */
1032: endpwent();
1033:
1034: /*
1.188 djm 1035: * Close any extra open file descriptors so that we don't have them
1.172 markus 1036: * hanging around in clients. Note that we want to do this after
1037: * initgroups, because at least on Solaris 2.3 it leaves file
1038: * descriptors open.
1039: */
1040: for (i = 3; i < 64; i++)
1041: close(i);
1042: }
1043:
1.127 markus 1044: /*
1045: * Performs common processing for the child, such as setting up the
1046: * environment, closing extra file descriptors, setting the user and group
1047: * ids, and executing the command or shell.
1048: */
1049: void
1050: do_child(Session *s, const char *command)
1051: {
1052: extern char **environ;
1053: char **env;
1054: char *argv[10];
1055: const char *shell, *shell0, *hostname = NULL;
1056: struct passwd *pw = s->pw;
1057:
1058: /* remove hostkey from the child's memory */
1059: destroy_sensitive_data();
1060:
1.172 markus 1061: /* Force a password change */
1062: if (s->authctxt->force_pwchange) {
1063: do_setusercontext(pw);
1064: child_close_fds();
1065: do_pwchange(s);
1066: exit(1);
1067: }
1068:
1.127 markus 1069: /* login(1) is only called if we execute the login shell */
1070: if (options.use_login && command != NULL)
1071: options.use_login = 0;
1072:
1073: /*
1074: * Login(1) does this as well, and it needs uid 0 for the "-h"
1075: * switch, so we let login(1) to this for us.
1076: */
1077: if (!options.use_login) {
1078: do_nologin(pw);
1079: do_setusercontext(pw);
1080: }
1081:
1082: /*
1083: * Get the shell from the password data. An empty shell field is
1084: * legal, and means /bin/sh.
1085: */
1086: shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1.152 markus 1087:
1088: /*
1089: * Make sure $SHELL points to the shell from the password file,
1090: * even if shell is overridden from login.conf
1091: */
1092: env = do_setup_env(s, shell);
1093:
1.127 markus 1094: #ifdef HAVE_LOGIN_CAP
1095: shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1096: #endif
1097:
1.26 millert 1098: /* we have to stash the hostname before we close our socket. */
1099: if (options.use_login)
1.70 stevesk 1100: hostname = get_remote_name_or_ip(utmp_len,
1.158 markus 1101: options.use_dns);
1.1 markus 1102: /*
1103: * Close the connection descriptors; note that this is the child, and
1104: * the server will still have the socket open, and it is important
1105: * that we do not shutdown it. Note that the descriptors cannot be
1106: * closed before building the environment, as we call
1107: * get_remote_ipaddr there.
1108: */
1.172 markus 1109: child_close_fds();
1.1 markus 1110:
1111: /*
1.125 deraadt 1112: * Must take new environment into use so that .ssh/rc,
1113: * /etc/ssh/sshrc and xauth are run in the proper environment.
1.1 markus 1114: */
1115: environ = env;
1.170 jakob 1116:
1117: #ifdef KRB5
1118: /*
1119: * At this point, we check to see if AFS is active and if we have
1120: * a valid Kerberos 5 TGT. If so, it seems like a good idea to see
1121: * if we can (and need to) extend the ticket into an AFS token. If
1122: * we don't do this, we run into potential problems if the user's
1123: * home directory is in AFS and it's not world-readable.
1124: */
1125:
1126: if (options.kerberos_get_afs_token && k_hasafs() &&
1.185 djm 1127: (s->authctxt->krb5_ctx != NULL)) {
1.170 jakob 1128: char cell[64];
1129:
1130: debug("Getting AFS token");
1131:
1132: k_setpag();
1133:
1134: if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1135: krb5_afslog(s->authctxt->krb5_ctx,
1136: s->authctxt->krb5_fwd_ccache, cell, NULL);
1137:
1138: krb5_afslog_home(s->authctxt->krb5_ctx,
1139: s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir);
1140: }
1141: #endif
1.104 markus 1142:
1.188 djm 1143: /* Change current directory to the user's home directory. */
1.104 markus 1144: if (chdir(pw->pw_dir) < 0) {
1145: fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1146: pw->pw_dir, strerror(errno));
1147: #ifdef HAVE_LOGIN_CAP
1148: if (login_getcapbool(lc, "requirehome", 0))
1149: exit(1);
1150: #endif
1151: }
1.1 markus 1152:
1.127 markus 1153: if (!options.use_login)
1154: do_rc_files(s, shell);
1.67 markus 1155:
1156: /* restore SIGPIPE for child */
1157: signal(SIGPIPE, SIG_DFL);
1158:
1.127 markus 1159: if (options.use_login) {
1.130 provos 1160: launch_login(pw, hostname);
1161: /* NEVERREACHED */
1.127 markus 1162: }
1163:
1164: /* Get the last component of the shell name. */
1165: if ((shell0 = strrchr(shell, '/')) != NULL)
1166: shell0++;
1167: else
1168: shell0 = shell;
1169:
1.1 markus 1170: /*
1171: * If we have no command, execute the shell. In this case, the shell
1172: * name to be passed in argv[0] is preceded by '-' to indicate that
1173: * this is a login shell.
1174: */
1175: if (!command) {
1.127 markus 1176: char argv0[256];
1.1 markus 1177:
1.127 markus 1178: /* Start the shell. Set initial character to '-'. */
1179: argv0[0] = '-';
1.1 markus 1180:
1.127 markus 1181: if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1.128 markus 1182: >= sizeof(argv0) - 1) {
1.127 markus 1183: errno = EINVAL;
1.1 markus 1184: perror(shell);
1185: exit(1);
1.127 markus 1186: }
1.1 markus 1187:
1.127 markus 1188: /* Execute the shell. */
1189: argv[0] = argv0;
1190: argv[1] = NULL;
1191: execve(shell, argv, env);
1192:
1193: /* Executing the shell failed. */
1194: perror(shell);
1195: exit(1);
1.1 markus 1196: }
1197: /*
1198: * Execute the command using the user's shell. This uses the -c
1199: * option to execute the command.
1200: */
1.127 markus 1201: argv[0] = (char *) shell0;
1.1 markus 1202: argv[1] = "-c";
1203: argv[2] = (char *) command;
1204: argv[3] = NULL;
1205: execve(shell, argv, env);
1206: perror(shell);
1207: exit(1);
1208: }
1209:
1210: Session *
1211: session_new(void)
1212: {
1213: int i;
1214: static int did_init = 0;
1215: if (!did_init) {
1216: debug("session_new: init");
1.112 deraadt 1217: for (i = 0; i < MAX_SESSIONS; i++) {
1.1 markus 1218: sessions[i].used = 0;
1219: }
1220: did_init = 1;
1221: }
1.112 deraadt 1222: for (i = 0; i < MAX_SESSIONS; i++) {
1.1 markus 1223: Session *s = &sessions[i];
1224: if (! s->used) {
1.68 djm 1225: memset(s, 0, sizeof(*s));
1.1 markus 1226: s->chanid = -1;
1227: s->ptyfd = -1;
1228: s->ttyfd = -1;
1229: s->used = 1;
1.85 markus 1230: s->self = i;
1.184 djm 1231: s->x11_chanids = NULL;
1.1 markus 1232: debug("session_new: session %d", i);
1233: return s;
1234: }
1235: }
1236: return NULL;
1237: }
1238:
1.94 itojun 1239: static void
1.1 markus 1240: session_dump(void)
1241: {
1242: int i;
1.112 deraadt 1243: for (i = 0; i < MAX_SESSIONS; i++) {
1.1 markus 1244: Session *s = &sessions[i];
1.137 mpech 1245: debug("dump: used %d session %d %p channel %d pid %ld",
1.1 markus 1246: s->used,
1247: s->self,
1248: s,
1249: s->chanid,
1.137 mpech 1250: (long)s->pid);
1.1 markus 1251: }
1252: }
1253:
1.2 markus 1254: int
1.97 markus 1255: session_open(Authctxt *authctxt, int chanid)
1.2 markus 1256: {
1257: Session *s = session_new();
1258: debug("session_open: channel %d", chanid);
1259: if (s == NULL) {
1260: error("no more sessions");
1261: return 0;
1262: }
1.97 markus 1263: s->authctxt = authctxt;
1264: s->pw = authctxt->pw;
1.167 djm 1265: if (s->pw == NULL || !authctxt->valid)
1.54 stevesk 1266: fatal("no user for session %d", s->self);
1.2 markus 1267: debug("session_open: session %d: link with channel %d", s->self, chanid);
1268: s->chanid = chanid;
1269: return 1;
1270: }
1271:
1.130 provos 1272: Session *
1273: session_by_tty(char *tty)
1274: {
1275: int i;
1276: for (i = 0; i < MAX_SESSIONS; i++) {
1277: Session *s = &sessions[i];
1278: if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1279: debug("session_by_tty: session %d tty %s", i, tty);
1280: return s;
1281: }
1282: }
1283: debug("session_by_tty: unknown tty %.100s", tty);
1284: session_dump();
1285: return NULL;
1286: }
1287:
1.94 itojun 1288: static Session *
1.2 markus 1289: session_by_channel(int id)
1290: {
1291: int i;
1.112 deraadt 1292: for (i = 0; i < MAX_SESSIONS; i++) {
1.2 markus 1293: Session *s = &sessions[i];
1294: if (s->used && s->chanid == id) {
1295: debug("session_by_channel: session %d channel %d", i, id);
1296: return s;
1297: }
1298: }
1299: debug("session_by_channel: unknown channel %d", id);
1300: session_dump();
1301: return NULL;
1302: }
1303:
1.94 itojun 1304: static Session *
1.184 djm 1305: session_by_x11_channel(int id)
1306: {
1307: int i, j;
1308:
1309: for (i = 0; i < MAX_SESSIONS; i++) {
1310: Session *s = &sessions[i];
1311:
1312: if (s->x11_chanids == NULL || !s->used)
1313: continue;
1314: for (j = 0; s->x11_chanids[j] != -1; j++) {
1315: if (s->x11_chanids[j] == id) {
1316: debug("session_by_x11_channel: session %d "
1317: "channel %d", s->self, id);
1318: return s;
1319: }
1320: }
1321: }
1322: debug("session_by_x11_channel: unknown channel %d", id);
1323: session_dump();
1324: return NULL;
1325: }
1326:
1327: static Session *
1.2 markus 1328: session_by_pid(pid_t pid)
1329: {
1330: int i;
1.137 mpech 1331: debug("session_by_pid: pid %ld", (long)pid);
1.112 deraadt 1332: for (i = 0; i < MAX_SESSIONS; i++) {
1.2 markus 1333: Session *s = &sessions[i];
1334: if (s->used && s->pid == pid)
1335: return s;
1336: }
1.137 mpech 1337: error("session_by_pid: unknown pid %ld", (long)pid);
1.2 markus 1338: session_dump();
1339: return NULL;
1340: }
1341:
1.94 itojun 1342: static int
1.2 markus 1343: session_window_change_req(Session *s)
1344: {
1345: s->col = packet_get_int();
1346: s->row = packet_get_int();
1347: s->xpixel = packet_get_int();
1348: s->ypixel = packet_get_int();
1.116 markus 1349: packet_check_eom();
1.2 markus 1350: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1351: return 1;
1352: }
1353:
1.94 itojun 1354: static int
1.2 markus 1355: session_pty_req(Session *s)
1356: {
1.45 markus 1357: u_int len;
1.72 stevesk 1358: int n_bytes;
1.132 markus 1359:
1.86 markus 1360: if (no_pty_flag) {
1361: debug("Allocating a pty not permitted for this authentication.");
1.19 markus 1362: return 0;
1.86 markus 1363: }
1364: if (s->ttyfd != -1) {
1365: packet_disconnect("Protocol error: you already have a pty.");
1.3 markus 1366: return 0;
1.86 markus 1367: }
1368:
1.2 markus 1369: s->term = packet_get_string(&len);
1.86 markus 1370:
1371: if (compat20) {
1372: s->col = packet_get_int();
1373: s->row = packet_get_int();
1374: } else {
1375: s->row = packet_get_int();
1376: s->col = packet_get_int();
1377: }
1.2 markus 1378: s->xpixel = packet_get_int();
1379: s->ypixel = packet_get_int();
1380:
1381: if (strcmp(s->term, "") == 0) {
1382: xfree(s->term);
1383: s->term = NULL;
1384: }
1.86 markus 1385:
1.2 markus 1386: /* Allocate a pty and open it. */
1.86 markus 1387: debug("Allocating pty.");
1.130 provos 1388: if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) {
1.86 markus 1389: if (s->term)
1390: xfree(s->term);
1.2 markus 1391: s->term = NULL;
1392: s->ptyfd = -1;
1393: s->ttyfd = -1;
1394: error("session_pty_req: session %d alloc failed", s->self);
1.3 markus 1395: return 0;
1.2 markus 1396: }
1397: debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1.86 markus 1398:
1399: /* for SSH1 the tty modes length is not given */
1400: if (!compat20)
1401: n_bytes = packet_remaining();
1402: tty_parse_modes(s->ttyfd, &n_bytes);
1403:
1.130 provos 1404: if (!use_privsep)
1405: pty_setowner(s->pw, s->tty);
1.86 markus 1406:
1407: /* Set window size from the packet. */
1.2 markus 1408: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1409:
1.116 markus 1410: packet_check_eom();
1.9 markus 1411: session_proctitle(s);
1.2 markus 1412: return 1;
1413: }
1414:
1.94 itojun 1415: static int
1.7 markus 1416: session_subsystem_req(Session *s)
1417: {
1.105 markus 1418: struct stat st;
1.45 markus 1419: u_int len;
1.7 markus 1420: int success = 0;
1.105 markus 1421: char *cmd, *subsys = packet_get_string(&len);
1.182 djm 1422: u_int i;
1.7 markus 1423:
1.116 markus 1424: packet_check_eom();
1.155 itojun 1425: logit("subsystem request for %.100s", subsys);
1.18 jakob 1426:
1427: for (i = 0; i < options.num_subsystems; i++) {
1.105 markus 1428: if (strcmp(subsys, options.subsystem_name[i]) == 0) {
1429: cmd = options.subsystem_command[i];
1430: if (stat(cmd, &st) < 0) {
1431: error("subsystem: cannot stat %s: %s", cmd,
1432: strerror(errno));
1433: break;
1434: }
1435: debug("subsystem: exec() %s", cmd);
1.64 markus 1436: s->is_subsystem = 1;
1.105 markus 1437: do_exec(s, cmd);
1.18 jakob 1438: success = 1;
1.122 markus 1439: break;
1.18 jakob 1440: }
1441: }
1442:
1443: if (!success)
1.155 itojun 1444: logit("subsystem request for %.100s failed, subsystem not found",
1.105 markus 1445: subsys);
1.7 markus 1446:
1447: xfree(subsys);
1448: return success;
1449: }
1450:
1.94 itojun 1451: static int
1.7 markus 1452: session_x11_req(Session *s)
1453: {
1.81 markus 1454: int success;
1.7 markus 1455:
1.184 djm 1456: if (s->auth_proto != NULL || s->auth_data != NULL) {
1457: error("session_x11_req: session %d: "
1.190 stevesk 1458: "x11 forwarding already active", s->self);
1.184 djm 1459: return 0;
1460: }
1.7 markus 1461: s->single_connection = packet_get_char();
1462: s->auth_proto = packet_get_string(NULL);
1463: s->auth_data = packet_get_string(NULL);
1464: s->screen = packet_get_int();
1.116 markus 1465: packet_check_eom();
1.7 markus 1466:
1.81 markus 1467: success = session_setup_x11fwd(s);
1468: if (!success) {
1.7 markus 1469: xfree(s->auth_proto);
1470: xfree(s->auth_data);
1.84 markus 1471: s->auth_proto = NULL;
1472: s->auth_data = NULL;
1.7 markus 1473: }
1.81 markus 1474: return success;
1.7 markus 1475: }
1476:
1.94 itojun 1477: static int
1.19 markus 1478: session_shell_req(Session *s)
1479: {
1.116 markus 1480: packet_check_eom();
1.90 markus 1481: do_exec(s, NULL);
1.19 markus 1482: return 1;
1483: }
1484:
1.94 itojun 1485: static int
1.19 markus 1486: session_exec_req(Session *s)
1487: {
1.45 markus 1488: u_int len;
1.19 markus 1489: char *command = packet_get_string(&len);
1.116 markus 1490: packet_check_eom();
1.90 markus 1491: do_exec(s, command);
1.92 markus 1492: xfree(command);
1.19 markus 1493: return 1;
1494: }
1495:
1.94 itojun 1496: static int
1.157 markus 1497: session_break_req(Session *s)
1498: {
1499:
1.175 deraadt 1500: packet_get_int(); /* ignored */
1.157 markus 1501: packet_check_eom();
1502:
1.160 markus 1503: if (s->ttyfd == -1 ||
1504: tcsendbreak(s->ttyfd, 0) < 0)
1.157 markus 1505: return 0;
1506: return 1;
1507: }
1508:
1509: static int
1.173 djm 1510: session_env_req(Session *s)
1511: {
1512: char *name, *val;
1513: u_int name_len, val_len, i;
1514:
1515: name = packet_get_string(&name_len);
1516: val = packet_get_string(&val_len);
1517: packet_check_eom();
1518:
1519: /* Don't set too many environment variables */
1520: if (s->num_env > 128) {
1521: debug2("Ignoring env request %s: too many env vars", name);
1522: goto fail;
1523: }
1524:
1525: for (i = 0; i < options.num_accept_env; i++) {
1526: if (match_pattern(name, options.accept_env[i])) {
1527: debug2("Setting env %d: %s=%s", s->num_env, name, val);
1.201 djm 1528: s->env = xrealloc(s->env, s->num_env + 1,
1529: sizeof(*s->env));
1.173 djm 1530: s->env[s->num_env].name = name;
1531: s->env[s->num_env].val = val;
1532: s->num_env++;
1533: return (1);
1534: }
1535: }
1536: debug2("Ignoring env request %s: disallowed name", name);
1537:
1538: fail:
1539: xfree(name);
1540: xfree(val);
1541: return (0);
1542: }
1543:
1544: static int
1.43 markus 1545: session_auth_agent_req(Session *s)
1546: {
1547: static int called = 0;
1.116 markus 1548: packet_check_eom();
1.44 markus 1549: if (no_agent_forwarding_flag) {
1550: debug("session_auth_agent_req: no_agent_forwarding_flag");
1551: return 0;
1552: }
1.43 markus 1553: if (called) {
1554: return 0;
1555: } else {
1556: called = 1;
1557: return auth_input_request_forwarding(s->pw);
1558: }
1559: }
1560:
1.123 markus 1561: int
1562: session_input_channel_req(Channel *c, const char *rtype)
1.2 markus 1563: {
1564: int success = 0;
1565: Session *s;
1566:
1.123 markus 1567: if ((s = session_by_channel(c->self)) == NULL) {
1.155 itojun 1568: logit("session_input_channel_req: no session %d req %.100s",
1.123 markus 1569: c->self, rtype);
1570: return 0;
1571: }
1572: debug("session_input_channel_req: session %d req %s", s->self, rtype);
1.2 markus 1573:
1574: /*
1.64 markus 1575: * a session is in LARVAL state until a shell, a command
1576: * or a subsystem is executed
1.2 markus 1577: */
1578: if (c->type == SSH_CHANNEL_LARVAL) {
1579: if (strcmp(rtype, "shell") == 0) {
1.19 markus 1580: success = session_shell_req(s);
1.2 markus 1581: } else if (strcmp(rtype, "exec") == 0) {
1.19 markus 1582: success = session_exec_req(s);
1.2 markus 1583: } else if (strcmp(rtype, "pty-req") == 0) {
1.3 markus 1584: success = session_pty_req(s);
1.7 markus 1585: } else if (strcmp(rtype, "x11-req") == 0) {
1586: success = session_x11_req(s);
1.43 markus 1587: } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1588: success = session_auth_agent_req(s);
1.7 markus 1589: } else if (strcmp(rtype, "subsystem") == 0) {
1590: success = session_subsystem_req(s);
1.173 djm 1591: } else if (strcmp(rtype, "env") == 0) {
1592: success = session_env_req(s);
1.2 markus 1593: }
1594: }
1595: if (strcmp(rtype, "window-change") == 0) {
1596: success = session_window_change_req(s);
1.177 djm 1597: } else if (strcmp(rtype, "break") == 0) {
1598: success = session_break_req(s);
1.2 markus 1599: }
1.177 djm 1600:
1.123 markus 1601: return success;
1.2 markus 1602: }
1603:
1604: void
1605: session_set_fds(Session *s, int fdin, int fdout, int fderr)
1606: {
1607: if (!compat20)
1608: fatal("session_set_fds: called for proto != 2.0");
1609: /*
1610: * now that have a child and a pipe to the child,
1611: * we can activate our channel and register the fd's
1612: */
1613: if (s->chanid == -1)
1614: fatal("no channel for session %d", s->self);
1615: channel_set_fds(s->chanid,
1616: fdout, fdin, fderr,
1.42 markus 1617: fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1.126 markus 1618: 1,
1619: CHAN_SES_WINDOW_DEFAULT);
1.2 markus 1620: }
1621:
1.85 markus 1622: /*
1623: * Function to perform pty cleanup. Also called if we get aborted abnormally
1624: * (e.g., due to a dropped connection).
1625: */
1.130 provos 1626: void
1.165 markus 1627: session_pty_cleanup2(Session *s)
1.1 markus 1628: {
1.85 markus 1629: if (s == NULL) {
1630: error("session_pty_cleanup: no session");
1631: return;
1632: }
1633: if (s->ttyfd == -1)
1.1 markus 1634: return;
1635:
1.54 stevesk 1636: debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
1.1 markus 1637:
1638: /* Record that the user has logged out. */
1.85 markus 1639: if (s->pid != 0)
1640: record_logout(s->pid, s->tty);
1.1 markus 1641:
1642: /* Release the pseudo-tty. */
1.130 provos 1643: if (getuid() == 0)
1644: pty_release(s->tty);
1.1 markus 1645:
1646: /*
1647: * Close the server side of the socket pairs. We must do this after
1648: * the pty cleanup, so that another process doesn't get this pty
1649: * while we're still cleaning up.
1650: */
1651: if (close(s->ptymaster) < 0)
1.130 provos 1652: error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
1.108 markus 1653:
1654: /* unlink pty from session */
1655: s->ttyfd = -1;
1.2 markus 1656: }
1657:
1.130 provos 1658: void
1.165 markus 1659: session_pty_cleanup(Session *s)
1.130 provos 1660: {
1.165 markus 1661: PRIVSEP(session_pty_cleanup2(s));
1.130 provos 1662: }
1663:
1.147 markus 1664: static char *
1665: sig2name(int sig)
1666: {
1667: #define SSH_SIG(x) if (sig == SIG ## x) return #x
1668: SSH_SIG(ABRT);
1669: SSH_SIG(ALRM);
1670: SSH_SIG(FPE);
1671: SSH_SIG(HUP);
1672: SSH_SIG(ILL);
1673: SSH_SIG(INT);
1674: SSH_SIG(KILL);
1675: SSH_SIG(PIPE);
1676: SSH_SIG(QUIT);
1677: SSH_SIG(SEGV);
1678: SSH_SIG(TERM);
1679: SSH_SIG(USR1);
1680: SSH_SIG(USR2);
1681: #undef SSH_SIG
1682: return "SIG@openssh.com";
1683: }
1684:
1.94 itojun 1685: static void
1.184 djm 1686: session_close_x11(int id)
1687: {
1688: Channel *c;
1689:
1.189 markus 1690: if ((c = channel_by_id(id)) == NULL) {
1.184 djm 1691: debug("session_close_x11: x11 channel %d missing", id);
1692: } else {
1693: /* Detach X11 listener */
1694: debug("session_close_x11: detach x11 channel %d", id);
1695: channel_cancel_cleanup(id);
1696: if (c->ostate != CHAN_OUTPUT_CLOSED)
1697: chan_mark_dead(c);
1698: }
1699: }
1700:
1701: static void
1702: session_close_single_x11(int id, void *arg)
1703: {
1704: Session *s;
1705: u_int i;
1706:
1707: debug3("session_close_single_x11: channel %d", id);
1708: channel_cancel_cleanup(id);
1709: if ((s = session_by_x11_channel(id)) == NULL)
1710: fatal("session_close_single_x11: no x11 channel %d", id);
1711: for (i = 0; s->x11_chanids[i] != -1; i++) {
1712: debug("session_close_single_x11: session %d: "
1713: "closing channel %d", s->self, s->x11_chanids[i]);
1714: /*
1715: * The channel "id" is already closing, but make sure we
1716: * close all of its siblings.
1717: */
1718: if (s->x11_chanids[i] != id)
1719: session_close_x11(s->x11_chanids[i]);
1720: }
1721: xfree(s->x11_chanids);
1722: s->x11_chanids = NULL;
1723: if (s->display) {
1724: xfree(s->display);
1725: s->display = NULL;
1726: }
1727: if (s->auth_proto) {
1728: xfree(s->auth_proto);
1729: s->auth_proto = NULL;
1730: }
1731: if (s->auth_data) {
1732: xfree(s->auth_data);
1733: s->auth_data = NULL;
1734: }
1735: if (s->auth_display) {
1736: xfree(s->auth_display);
1737: s->auth_display = NULL;
1738: }
1739: }
1740:
1741: static void
1.2 markus 1742: session_exit_message(Session *s, int status)
1743: {
1744: Channel *c;
1.124 markus 1745:
1746: if ((c = channel_lookup(s->chanid)) == NULL)
1.85 markus 1747: fatal("session_exit_message: session %d: no channel %d",
1.2 markus 1748: s->self, s->chanid);
1.137 mpech 1749: debug("session_exit_message: session %d channel %d pid %ld",
1750: s->self, s->chanid, (long)s->pid);
1.2 markus 1751:
1752: if (WIFEXITED(status)) {
1.124 markus 1753: channel_request_start(s->chanid, "exit-status", 0);
1.2 markus 1754: packet_put_int(WEXITSTATUS(status));
1755: packet_send();
1756: } else if (WIFSIGNALED(status)) {
1.124 markus 1757: channel_request_start(s->chanid, "exit-signal", 0);
1.147 markus 1758: packet_put_cstring(sig2name(WTERMSIG(status)));
1.2 markus 1759: packet_put_char(WCOREDUMP(status));
1760: packet_put_cstring("");
1761: packet_put_cstring("");
1762: packet_send();
1763: } else {
1764: /* Some weird exit cause. Just exit. */
1765: packet_disconnect("wait returned status %04x.", status);
1766: }
1767:
1768: /* disconnect channel */
1769: debug("session_exit_message: release channel %d", s->chanid);
1.187 djm 1770:
1771: /*
1772: * Adjust cleanup callback attachment to send close messages when
1.199 deraadt 1773: * the channel gets EOF. The session will be then be closed
1.187 djm 1774: * by session_close_by_channel when the childs close their fds.
1775: */
1776: channel_register_cleanup(c->self, session_close_by_channel, 1);
1777:
1.5 markus 1778: /*
1779: * emulate a write failure with 'chan_write_failed', nobody will be
1780: * interested in data we write.
1781: * Note that we must not call 'chan_read_failed', since there could
1782: * be some more data waiting in the pipe.
1783: */
1.8 markus 1784: if (c->ostate != CHAN_OUTPUT_CLOSED)
1785: chan_write_failed(c);
1.2 markus 1786: }
1787:
1.130 provos 1788: void
1.85 markus 1789: session_close(Session *s)
1.2 markus 1790: {
1.182 djm 1791: u_int i;
1.173 djm 1792:
1.137 mpech 1793: debug("session_close: session %d pid %ld", s->self, (long)s->pid);
1.165 markus 1794: if (s->ttyfd != -1)
1.85 markus 1795: session_pty_cleanup(s);
1.2 markus 1796: if (s->term)
1797: xfree(s->term);
1798: if (s->display)
1799: xfree(s->display);
1.184 djm 1800: if (s->x11_chanids)
1801: xfree(s->x11_chanids);
1.118 stevesk 1802: if (s->auth_display)
1803: xfree(s->auth_display);
1.2 markus 1804: if (s->auth_data)
1805: xfree(s->auth_data);
1806: if (s->auth_proto)
1807: xfree(s->auth_proto);
1808: s->used = 0;
1.173 djm 1809: for (i = 0; i < s->num_env; i++) {
1810: xfree(s->env[i].name);
1811: xfree(s->env[i].val);
1812: }
1813: if (s->env != NULL)
1814: xfree(s->env);
1.9 markus 1815: session_proctitle(s);
1.2 markus 1816: }
1817:
1818: void
1819: session_close_by_pid(pid_t pid, int status)
1820: {
1821: Session *s = session_by_pid(pid);
1822: if (s == NULL) {
1.137 mpech 1823: debug("session_close_by_pid: no session for pid %ld",
1824: (long)pid);
1.2 markus 1825: return;
1826: }
1827: if (s->chanid != -1)
1828: session_exit_message(s, status);
1.187 djm 1829: if (s->ttyfd != -1)
1830: session_pty_cleanup(s);
1.197 djm 1831: s->pid = 0;
1.98 markus 1832: }
1833:
1.2 markus 1834: /*
1835: * this is called when a channel dies before
1836: * the session 'child' itself dies
1837: */
1838: void
1839: session_close_by_channel(int id, void *arg)
1840: {
1841: Session *s = session_by_channel(id);
1.187 djm 1842: u_int i;
1.184 djm 1843:
1.2 markus 1844: if (s == NULL) {
1.107 markus 1845: debug("session_close_by_channel: no session for id %d", id);
1.2 markus 1846: return;
1847: }
1.137 mpech 1848: debug("session_close_by_channel: channel %d child %ld",
1849: id, (long)s->pid);
1.107 markus 1850: if (s->pid != 0) {
1851: debug("session_close_by_channel: channel %d: has child", id);
1.108 markus 1852: /*
1853: * delay detach of session, but release pty, since
1854: * the fd's to the child are already closed
1855: */
1.165 markus 1856: if (s->ttyfd != -1)
1.108 markus 1857: session_pty_cleanup(s);
1.107 markus 1858: return;
1859: }
1860: /* detach by removing callback */
1.2 markus 1861: channel_cancel_cleanup(s->chanid);
1.187 djm 1862:
1863: /* Close any X11 listeners associated with this session */
1864: if (s->x11_chanids != NULL) {
1865: for (i = 0; s->x11_chanids[i] != -1; i++) {
1866: session_close_x11(s->x11_chanids[i]);
1867: s->x11_chanids[i] = -1;
1868: }
1869: }
1870:
1.2 markus 1871: s->chanid = -1;
1.106 markus 1872: session_close(s);
1873: }
1874:
1875: void
1.130 provos 1876: session_destroy_all(void (*closefunc)(Session *))
1.106 markus 1877: {
1878: int i;
1.112 deraadt 1879: for (i = 0; i < MAX_SESSIONS; i++) {
1.106 markus 1880: Session *s = &sessions[i];
1.130 provos 1881: if (s->used) {
1882: if (closefunc != NULL)
1883: closefunc(s);
1884: else
1885: session_close(s);
1886: }
1.2 markus 1887: }
1.9 markus 1888: }
1889:
1.94 itojun 1890: static char *
1.9 markus 1891: session_tty_list(void)
1892: {
1893: static char buf[1024];
1894: int i;
1895: buf[0] = '\0';
1.112 deraadt 1896: for (i = 0; i < MAX_SESSIONS; i++) {
1.9 markus 1897: Session *s = &sessions[i];
1898: if (s->used && s->ttyfd != -1) {
1899: if (buf[0] != '\0')
1900: strlcat(buf, ",", sizeof buf);
1901: strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
1902: }
1903: }
1904: if (buf[0] == '\0')
1905: strlcpy(buf, "notty", sizeof buf);
1906: return buf;
1907: }
1908:
1909: void
1910: session_proctitle(Session *s)
1911: {
1912: if (s->pw == NULL)
1913: error("no user for session %d", s->self);
1914: else
1915: setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1.81 markus 1916: }
1917:
1918: int
1919: session_setup_x11fwd(Session *s)
1920: {
1921: struct stat st;
1.109 stevesk 1922: char display[512], auth_display[512];
1923: char hostname[MAXHOSTNAMELEN];
1.184 djm 1924: u_int i;
1.81 markus 1925:
1926: if (no_x11_forwarding_flag) {
1927: packet_send_debug("X11 forwarding disabled in user configuration file.");
1928: return 0;
1929: }
1930: if (!options.x11_forwarding) {
1931: debug("X11 forwarding disabled in server configuration file.");
1932: return 0;
1933: }
1934: if (!options.xauth_location ||
1935: (stat(options.xauth_location, &st) == -1)) {
1936: packet_send_debug("No xauth program; cannot forward with spoofing.");
1.91 markus 1937: return 0;
1938: }
1939: if (options.use_login) {
1940: packet_send_debug("X11 forwarding disabled; "
1941: "not compatible with UseLogin=yes.");
1.81 markus 1942: return 0;
1943: }
1.87 markus 1944: if (s->display != NULL) {
1.81 markus 1945: debug("X11 display already set.");
1946: return 0;
1947: }
1.140 deraadt 1948: if (x11_create_display_inet(options.x11_display_offset,
1949: options.x11_use_localhost, s->single_connection,
1.184 djm 1950: &s->display_number, &s->x11_chanids) == -1) {
1.87 markus 1951: debug("x11_create_display_inet failed.");
1.81 markus 1952: return 0;
1.184 djm 1953: }
1954: for (i = 0; s->x11_chanids[i] != -1; i++) {
1955: channel_register_cleanup(s->x11_chanids[i],
1.187 djm 1956: session_close_single_x11, 0);
1.81 markus 1957: }
1.109 stevesk 1958:
1959: /* Set up a suitable value for the DISPLAY variable. */
1960: if (gethostname(hostname, sizeof(hostname)) < 0)
1961: fatal("gethostname: %.100s", strerror(errno));
1962: /*
1963: * auth_display must be used as the displayname when the
1964: * authorization entry is added with xauth(1). This will be
1965: * different than the DISPLAY string for localhost displays.
1966: */
1.119 stevesk 1967: if (options.x11_use_localhost) {
1.140 deraadt 1968: snprintf(display, sizeof display, "localhost:%u.%u",
1.109 stevesk 1969: s->display_number, s->screen);
1.140 deraadt 1970: snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
1.118 stevesk 1971: s->display_number, s->screen);
1.109 stevesk 1972: s->display = xstrdup(display);
1.118 stevesk 1973: s->auth_display = xstrdup(auth_display);
1.109 stevesk 1974: } else {
1.140 deraadt 1975: snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
1.109 stevesk 1976: s->display_number, s->screen);
1977: s->display = xstrdup(display);
1.118 stevesk 1978: s->auth_display = xstrdup(display);
1.109 stevesk 1979: }
1980:
1.81 markus 1981: return 1;
1.2 markus 1982: }
1983:
1.94 itojun 1984: static void
1.49 markus 1985: do_authenticated2(Authctxt *authctxt)
1.2 markus 1986: {
1.97 markus 1987: server_loop2(authctxt);
1.165 markus 1988: }
1989:
1990: void
1991: do_cleanup(Authctxt *authctxt)
1992: {
1993: static int called = 0;
1994:
1995: debug("do_cleanup");
1996:
1997: /* no cleanup if we're in the child for login shell */
1998: if (is_child)
1999: return;
2000:
2001: /* avoid double cleanup */
2002: if (called)
2003: return;
2004: called = 1;
2005:
2006: if (authctxt == NULL)
2007: return;
2008: #ifdef KRB5
2009: if (options.kerberos_ticket_cleanup &&
2010: authctxt->krb5_ctx)
2011: krb5_cleanup_proc(authctxt);
1.161 markus 2012: #endif
1.165 markus 2013:
2014: #ifdef GSSAPI
2015: if (compat20 && options.gss_cleanup_creds)
2016: ssh_gssapi_cleanup_creds();
2017: #endif
2018:
2019: /* remove agent socket */
2020: auth_sock_cleanup_proc(authctxt->pw);
2021:
2022: /*
2023: * Cleanup ptys/utmp only if privsep is disabled,
2024: * or if running in monitor.
2025: */
2026: if (!use_privsep || mm_is_monitor())
2027: session_destroy_all(session_pty_cleanup2);
1.1 markus 2028: }
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