Annotation of src/usr.bin/ssh/session.c, Revision 1.197.2.2
1.197.2.2! brad 1: /* $OpenBSD: session.c,v 1.220 2006/10/09 23:36:11 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:
1.193 stevesk 36: #include <sys/types.h>
37: #include <sys/wait.h>
1.194 stevesk 38: #include <sys/un.h>
1.196 stevesk 39: #include <sys/stat.h>
1.197.2.1 brad 40: #include <sys/socket.h>
41: #include <sys/param.h>
1.192 stevesk 42:
1.197.2.1 brad 43: #include <errno.h>
44: #include <grp.h>
1.192 stevesk 45: #include <paths.h>
1.197.2.1 brad 46: #include <pwd.h>
1.195 stevesk 47: #include <signal.h>
1.197.2.1 brad 48: #include <stdio.h>
49: #include <stdlib.h>
50: #include <string.h>
51: #include <unistd.h>
1.1 markus 52:
1.197.2.1 brad 53: #include "xmalloc.h"
1.51 markus 54: #include "ssh.h"
55: #include "ssh1.h"
56: #include "ssh2.h"
1.59 djm 57: #include "sshpty.h"
1.1 markus 58: #include "packet.h"
59: #include "buffer.h"
1.173 djm 60: #include "match.h"
1.1 markus 61: #include "uidswap.h"
62: #include "compat.h"
1.78 markus 63: #include "channels.h"
1.197.2.1 brad 64: #include "key.h"
65: #include "cipher.h"
66: #include "kex.h"
67: #include "hostfile.h"
1.2 markus 68: #include "auth.h"
1.19 markus 69: #include "auth-options.h"
1.50 markus 70: #include "pathnames.h"
1.51 markus 71: #include "log.h"
72: #include "servconf.h"
1.59 djm 73: #include "sshlogin.h"
1.51 markus 74: #include "serverloop.h"
75: #include "canohost.h"
1.55 itojun 76: #include "session.h"
1.197.2.1 brad 77: #ifdef GSSAPI
78: #include "ssh-gss.h"
79: #endif
1.130 provos 80: #include "monitor_wrap.h"
1.171 markus 81:
82: #ifdef KRB5
83: #include <kafs.h>
84: #endif
1.1 markus 85:
86: /* func */
87:
88: Session *session_new(void);
1.94 itojun 89: void session_set_fds(Session *, int, int, int);
1.165 markus 90: void session_pty_cleanup(Session *);
1.94 itojun 91: void session_proctitle(Session *);
92: int session_setup_x11fwd(Session *);
93: void do_exec_pty(Session *, const char *);
94: void do_exec_no_pty(Session *, const char *);
95: void do_exec(Session *, const char *);
96: void do_login(Session *, const char *);
97: void do_child(Session *, const char *);
1.73 djm 98: void do_motd(void);
1.94 itojun 99: int check_quietlogin(Session *, const char *);
1.1 markus 100:
1.94 itojun 101: static void do_authenticated1(Authctxt *);
102: static void do_authenticated2(Authctxt *);
103:
104: static int session_pty_req(Session *);
1.65 markus 105:
1.1 markus 106: /* import */
107: extern ServerOptions options;
108: extern char *__progname;
109: extern int log_stderr;
110: extern int debug_flag;
1.45 markus 111: extern u_int utmp_len;
1.21 markus 112: extern int startup_pipe;
1.74 markus 113: extern void destroy_sensitive_data(void);
1.179 dtucker 114: extern Buffer loginmsg;
1.21 markus 115:
1.34 markus 116: /* original command from peer. */
1.92 markus 117: const char *original_command = NULL;
1.34 markus 118:
1.1 markus 119: /* data */
120: #define MAX_SESSIONS 10
121: Session sessions[MAX_SESSIONS];
122:
1.28 millert 123: #ifdef HAVE_LOGIN_CAP
1.129 provos 124: login_cap_t *lc;
1.28 millert 125: #endif
126:
1.165 markus 127: static int is_child = 0;
128:
1.136 markus 129: /* Name and directory of socket for authentication agent forwarding. */
130: static char *auth_sock_name = NULL;
131: static char *auth_sock_dir = NULL;
132:
133: /* removes the agent forwarding socket */
134:
135: static void
1.165 markus 136: auth_sock_cleanup_proc(struct passwd *pw)
1.136 markus 137: {
138: if (auth_sock_name != NULL) {
139: temporarily_use_uid(pw);
140: unlink(auth_sock_name);
141: rmdir(auth_sock_dir);
142: auth_sock_name = NULL;
143: restore_uid();
144: }
145: }
146:
147: static int
148: auth_input_request_forwarding(struct passwd * pw)
149: {
150: Channel *nc;
151: int sock;
152: struct sockaddr_un sunaddr;
153:
154: if (auth_sock_name != NULL) {
155: error("authentication forwarding requested twice.");
156: return 0;
157: }
158:
159: /* Temporarily drop privileged uid for mkdir/bind. */
160: temporarily_use_uid(pw);
161:
162: /* Allocate a buffer for the socket name, and format the name. */
163: auth_sock_name = xmalloc(MAXPATHLEN);
164: auth_sock_dir = xmalloc(MAXPATHLEN);
1.166 markus 165: strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
1.136 markus 166:
167: /* Create private directory for socket */
168: if (mkdtemp(auth_sock_dir) == NULL) {
169: packet_send_debug("Agent forwarding disabled: "
170: "mkdtemp() failed: %.100s", strerror(errno));
171: restore_uid();
172: xfree(auth_sock_name);
173: xfree(auth_sock_dir);
174: auth_sock_name = NULL;
175: auth_sock_dir = NULL;
176: return 0;
177: }
1.137 mpech 178: snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld",
179: auth_sock_dir, (long) getpid());
1.136 markus 180:
181: /* Create the socket. */
182: sock = socket(AF_UNIX, SOCK_STREAM, 0);
183: if (sock < 0)
184: packet_disconnect("socket: %.100s", strerror(errno));
185:
186: /* Bind it to the name. */
187: memset(&sunaddr, 0, sizeof(sunaddr));
188: sunaddr.sun_family = AF_UNIX;
189: strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path));
190:
1.197.2.1 brad 191: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0)
1.136 markus 192: packet_disconnect("bind: %.100s", strerror(errno));
193:
194: /* Restore the privileged uid. */
195: restore_uid();
196:
197: /* Start listening on the socket. */
1.169 markus 198: if (listen(sock, SSH_LISTEN_BACKLOG) < 0)
1.136 markus 199: packet_disconnect("listen: %.100s", strerror(errno));
200:
201: /* Allocate a channel for the authentication agent socket. */
202: nc = channel_new("auth socket",
203: SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
204: CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
1.156 markus 205: 0, "auth socket", 1);
1.136 markus 206: strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
207: return 1;
208: }
209:
1.179 dtucker 210: static void
211: display_loginmsg(void)
212: {
1.183 djm 213: if (buffer_len(&loginmsg) > 0) {
214: buffer_append(&loginmsg, "\0", 1);
215: printf("%s", (char *)buffer_ptr(&loginmsg));
216: buffer_clear(&loginmsg);
217: }
1.179 dtucker 218: }
1.136 markus 219:
1.65 markus 220: void
221: do_authenticated(Authctxt *authctxt)
222: {
1.153 markus 223: setproctitle("%s", authctxt->pw->pw_name);
224:
1.65 markus 225: /* setup the channel layer */
226: if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
227: channel_permit_all_opens();
228:
229: if (compat20)
230: do_authenticated2(authctxt);
231: else
232: do_authenticated1(authctxt);
1.79 markus 233:
1.165 markus 234: do_cleanup(authctxt);
1.65 markus 235: }
236:
1.1 markus 237: /*
238: * Prepares for an interactive session. This is called after the user has
239: * been successfully authenticated. During this message exchange, pseudo
240: * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
241: * are requested, etc.
242: */
1.94 itojun 243: static void
1.65 markus 244: do_authenticated1(Authctxt *authctxt)
1.1 markus 245: {
246: Session *s;
1.65 markus 247: char *command;
1.117 markus 248: int success, type, screen_flag;
1.139 deraadt 249: int enable_compression_after_reply = 0;
250: u_int proto_len, data_len, dlen, compression_level = 0;
1.1 markus 251:
1.61 markus 252: s = session_new();
1.181 markus 253: if (s == NULL) {
254: error("no more sessions");
255: return;
256: }
1.96 dugsong 257: s->authctxt = authctxt;
1.65 markus 258: s->pw = authctxt->pw;
1.28 millert 259:
1.1 markus 260: /*
261: * We stay in this loop until the client requests to execute a shell
262: * or a command.
263: */
264: for (;;) {
1.65 markus 265: success = 0;
1.1 markus 266:
267: /* Get a packet from the client. */
1.117 markus 268: type = packet_read();
1.1 markus 269:
270: /* Process the packet. */
271: switch (type) {
272: case SSH_CMSG_REQUEST_COMPRESSION:
273: compression_level = packet_get_int();
1.116 markus 274: packet_check_eom();
1.1 markus 275: if (compression_level < 1 || compression_level > 9) {
1.180 markus 276: packet_send_debug("Received invalid compression level %d.",
1.112 deraadt 277: compression_level);
1.138 markus 278: break;
279: }
1.186 markus 280: if (options.compression == COMP_NONE) {
1.138 markus 281: debug2("compression disabled");
1.1 markus 282: break;
283: }
284: /* Enable compression after we have responded with SUCCESS. */
285: enable_compression_after_reply = 1;
286: success = 1;
287: break;
288:
289: case SSH_CMSG_REQUEST_PTY:
1.86 markus 290: success = session_pty_req(s);
1.1 markus 291: break;
292:
293: case SSH_CMSG_X11_REQUEST_FORWARDING:
294: s->auth_proto = packet_get_string(&proto_len);
295: s->auth_data = packet_get_string(&data_len);
296:
1.57 markus 297: screen_flag = packet_get_protocol_flags() &
298: SSH_PROTOFLAG_SCREEN_NUMBER;
299: debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
300:
301: if (packet_remaining() == 4) {
302: if (!screen_flag)
303: debug2("Buggy client: "
304: "X11 screen flag missing");
1.1 markus 305: s->screen = packet_get_int();
1.56 markus 306: } else {
1.1 markus 307: s->screen = 0;
1.56 markus 308: }
1.116 markus 309: packet_check_eom();
1.81 markus 310: success = session_setup_x11fwd(s);
311: if (!success) {
312: xfree(s->auth_proto);
313: xfree(s->auth_data);
1.84 markus 314: s->auth_proto = NULL;
315: s->auth_data = NULL;
1.1 markus 316: }
317: break;
318:
319: case SSH_CMSG_AGENT_REQUEST_FORWARDING:
320: if (no_agent_forwarding_flag || compat13) {
321: debug("Authentication agent forwarding not permitted for this authentication.");
322: break;
323: }
324: debug("Received authentication agent forwarding request.");
1.65 markus 325: success = auth_input_request_forwarding(s->pw);
1.1 markus 326: break;
327:
328: case SSH_CMSG_PORT_FORWARD_REQUEST:
329: if (no_port_forwarding_flag) {
330: debug("Port forwarding not permitted for this authentication.");
1.39 markus 331: break;
332: }
333: if (!options.allow_tcp_forwarding) {
334: debug("Port forwarding not permitted.");
1.1 markus 335: break;
336: }
337: debug("Received TCP/IP port forwarding request.");
1.197.2.1 brad 338: if (channel_input_port_forward_request(s->pw->pw_uid == 0,
339: options.gateway_ports) < 0) {
340: debug("Port forwarding failed.");
341: break;
342: }
1.1 markus 343: success = 1;
344: break;
345:
346: case SSH_CMSG_MAX_PACKET_SIZE:
347: if (packet_set_maxsize(packet_get_int()) > 0)
348: success = 1;
349: break;
350:
351: case SSH_CMSG_EXEC_SHELL:
352: case SSH_CMSG_EXEC_CMD:
353: if (type == SSH_CMSG_EXEC_CMD) {
354: command = packet_get_string(&dlen);
355: debug("Exec command '%.500s'", command);
1.92 markus 356: do_exec(s, command);
357: xfree(command);
1.1 markus 358: } else {
1.92 markus 359: do_exec(s, NULL);
1.1 markus 360: }
1.116 markus 361: packet_check_eom();
1.82 markus 362: session_close(s);
1.1 markus 363: return;
364:
365: default:
366: /*
367: * Any unknown messages in this phase are ignored,
368: * and a failure message is returned.
369: */
1.155 itojun 370: logit("Unknown packet type received after authentication: %d", type);
1.1 markus 371: }
372: packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
373: packet_send();
374: packet_write_wait();
375:
376: /* Enable compression now that we have replied if appropriate. */
377: if (enable_compression_after_reply) {
378: enable_compression_after_reply = 0;
379: packet_start_compression(compression_level);
380: }
381: }
382: }
383:
384: /*
385: * This is called to fork and execute a command when we have no tty. This
386: * will call do_child from the child, and server_loop from the parent after
387: * setting up file descriptors and such.
388: */
1.4 markus 389: void
1.63 markus 390: do_exec_no_pty(Session *s, const char *command)
1.1 markus 391: {
1.137 mpech 392: pid_t pid;
1.1 markus 393:
394: int inout[2], err[2];
395: /* Uses socket pairs to communicate with the program. */
396: if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
397: socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
398: packet_disconnect("Could not create socket pairs: %.100s",
399: strerror(errno));
400: if (s == NULL)
401: fatal("do_exec_no_pty: no session");
402:
1.9 markus 403: session_proctitle(s);
1.1 markus 404:
405: /* Fork the child. */
406: if ((pid = fork()) == 0) {
1.165 markus 407: is_child = 1;
1.144 markus 408:
1.1 markus 409: /* Child. Reinitialize the log since the pid has changed. */
410: log_init(__progname, options.log_level, options.log_facility, log_stderr);
411:
412: /*
413: * Create a new session and process group since the 4.4BSD
414: * setlogin() affects the entire process group.
415: */
416: if (setsid() < 0)
417: error("setsid failed: %.100s", strerror(errno));
418:
419: /*
420: * Redirect stdin, stdout, and stderr. Stdin and stdout will
421: * use the same socket, as some programs (particularly rdist)
422: * seem to depend on it.
423: */
424: close(inout[1]);
425: close(err[1]);
426: if (dup2(inout[0], 0) < 0) /* stdin */
427: perror("dup2 stdin");
428: if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
429: perror("dup2 stdout");
430: if (dup2(err[0], 2) < 0) /* stderr */
431: perror("dup2 stderr");
432:
433: /* Do processing for the child (exec command etc). */
1.60 markus 434: do_child(s, command);
1.1 markus 435: /* NOTREACHED */
436: }
437: if (pid < 0)
438: packet_disconnect("fork failed: %.100s", strerror(errno));
439: s->pid = pid;
1.47 markus 440: /* Set interactive/non-interactive mode. */
1.48 markus 441: packet_set_interactive(s->display != NULL);
1.1 markus 442:
443: /* We are the parent. Close the child sides of the socket pairs. */
444: close(inout[0]);
445: close(err[0]);
446:
447: /*
448: * Enter the interactive session. Note: server_loop must be able to
449: * handle the case that fdin and fdout are the same.
450: */
1.2 markus 451: if (compat20) {
1.64 markus 452: session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
1.2 markus 453: } else {
454: server_loop(pid, inout[1], inout[1], err[1]);
455: /* server_loop has closed inout[1] and err[1]. */
456: }
1.1 markus 457: }
458:
459: /*
460: * This is called to fork and execute a command when we have a tty. This
461: * will call do_child from the child, and server_loop from the parent after
462: * setting up file descriptors, controlling tty, updating wtmp, utmp,
463: * lastlog, and other such operations.
464: */
1.4 markus 465: void
1.63 markus 466: do_exec_pty(Session *s, const char *command)
1.1 markus 467: {
468: int fdout, ptyfd, ttyfd, ptymaster;
469: pid_t pid;
470:
471: if (s == NULL)
472: fatal("do_exec_pty: no session");
473: ptyfd = s->ptyfd;
474: ttyfd = s->ttyfd;
475:
476: /* Fork the child. */
477: if ((pid = fork()) == 0) {
1.165 markus 478: is_child = 1;
1.97 markus 479:
1.24 markus 480: /* Child. Reinitialize the log because the pid has changed. */
1.1 markus 481: log_init(__progname, options.log_level, options.log_facility, log_stderr);
482: /* Close the master side of the pseudo tty. */
483: close(ptyfd);
484:
485: /* Make the pseudo tty our controlling tty. */
486: pty_make_controlling_tty(&ttyfd, s->tty);
487:
1.103 markus 488: /* Redirect stdin/stdout/stderr from the pseudo tty. */
489: if (dup2(ttyfd, 0) < 0)
490: error("dup2 stdin: %s", strerror(errno));
491: if (dup2(ttyfd, 1) < 0)
492: error("dup2 stdout: %s", strerror(errno));
493: if (dup2(ttyfd, 2) < 0)
494: error("dup2 stderr: %s", strerror(errno));
1.1 markus 495:
496: /* Close the extra descriptor for the pseudo tty. */
497: close(ttyfd);
498:
1.24 markus 499: /* record login, etc. similar to login(1) */
1.41 markus 500: if (!(options.use_login && command == NULL))
501: do_login(s, command);
1.1 markus 502:
503: /* Do common processing for the child, such as execing the command. */
1.60 markus 504: do_child(s, command);
1.1 markus 505: /* NOTREACHED */
506: }
507: if (pid < 0)
508: packet_disconnect("fork failed: %.100s", strerror(errno));
509: s->pid = pid;
510:
511: /* Parent. Close the slave side of the pseudo tty. */
512: close(ttyfd);
513:
514: /*
515: * Create another descriptor of the pty master side for use as the
516: * standard input. We could use the original descriptor, but this
517: * simplifies code in server_loop. The descriptor is bidirectional.
518: */
519: fdout = dup(ptyfd);
520: if (fdout < 0)
521: packet_disconnect("dup #1 failed: %.100s", strerror(errno));
522:
523: /* we keep a reference to the pty master */
524: ptymaster = dup(ptyfd);
525: if (ptymaster < 0)
526: packet_disconnect("dup #2 failed: %.100s", strerror(errno));
527: s->ptymaster = ptymaster;
528:
529: /* Enter interactive session. */
1.47 markus 530: packet_set_interactive(1);
1.2 markus 531: if (compat20) {
532: session_set_fds(s, ptyfd, fdout, -1);
533: } else {
534: server_loop(pid, ptyfd, fdout, -1);
535: /* server_loop _has_ closed ptyfd and fdout. */
1.24 markus 536: }
537: }
538:
1.90 markus 539: /*
540: * This is called to fork and execute a command. If another command is
541: * to be forced, execute that instead.
542: */
543: void
544: do_exec(Session *s, const char *command)
545: {
1.197.2.1 brad 546: if (options.adm_forced_command) {
547: original_command = command;
548: command = options.adm_forced_command;
549: debug("Forced command (config) '%.900s'", command);
550: } else if (forced_command) {
1.90 markus 551: original_command = command;
552: command = forced_command;
1.197.2.1 brad 553: debug("Forced command (key option) '%.900s'", command);
1.90 markus 554: }
1.163 markus 555:
556: #ifdef GSSAPI
557: if (options.gss_authentication) {
558: temporarily_use_uid(s->pw);
559: ssh_gssapi_storecreds();
560: restore_uid();
561: }
562: #endif
1.90 markus 563:
564: if (s->ttyfd != -1)
565: do_exec_pty(s, command);
566: else
567: do_exec_no_pty(s, command);
568:
1.92 markus 569: original_command = NULL;
1.179 dtucker 570:
571: /*
572: * Clear loginmsg: it's the child's responsibility to display
573: * it to the user, otherwise multiple sessions may accumulate
574: * multiple copies of the login messages.
575: */
576: buffer_clear(&loginmsg);
1.90 markus 577: }
578:
579:
1.24 markus 580: /* administrative, login(1)-like work */
581: void
1.41 markus 582: do_login(Session *s, const char *command)
1.24 markus 583: {
584: socklen_t fromlen;
585: struct sockaddr_storage from;
586: struct passwd * pw = s->pw;
587: pid_t pid = getpid();
588:
589: /*
590: * Get IP address of client. If the connection is not a socket, let
591: * the address be 0.0.0.0.
592: */
593: memset(&from, 0, sizeof(from));
1.148 stevesk 594: fromlen = sizeof(from);
1.24 markus 595: if (packet_connection_is_on_socket()) {
596: if (getpeername(packet_get_connection_in(),
1.197.2.1 brad 597: (struct sockaddr *)&from, &fromlen) < 0) {
1.24 markus 598: debug("getpeername: %.100s", strerror(errno));
1.165 markus 599: cleanup_exit(255);
1.24 markus 600: }
601: }
1.25 markus 602:
1.24 markus 603: /* Record that there was a login on that tty from the remote host. */
1.133 markus 604: if (!use_privsep)
605: record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
606: get_remote_name_or_ip(utmp_len,
1.158 markus 607: options.use_dns),
1.148 stevesk 608: (struct sockaddr *)&from, fromlen);
1.24 markus 609:
1.73 djm 610: if (check_quietlogin(s, command))
1.24 markus 611: return;
1.73 djm 612:
1.179 dtucker 613: display_loginmsg();
1.73 djm 614:
615: do_motd();
616: }
617:
618: /*
619: * Display the message of the day.
620: */
621: void
622: do_motd(void)
623: {
624: FILE *f;
625: char buf[256];
626:
1.24 markus 627: if (options.print_motd) {
1.28 millert 628: #ifdef HAVE_LOGIN_CAP
629: f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
630: "/etc/motd"), "r");
631: #else
1.24 markus 632: f = fopen("/etc/motd", "r");
1.28 millert 633: #endif
1.24 markus 634: if (f) {
635: while (fgets(buf, sizeof(buf), f))
636: fputs(buf, stdout);
637: fclose(f);
638: }
1.2 markus 639: }
1.73 djm 640: }
641:
642:
643: /*
644: * Check for quiet login, either .hushlogin or command given.
645: */
646: int
647: check_quietlogin(Session *s, const char *command)
648: {
649: char buf[256];
1.96 dugsong 650: struct passwd *pw = s->pw;
1.73 djm 651: struct stat st;
652:
653: /* Return 1 if .hushlogin exists or a command given. */
654: if (command != NULL)
655: return 1;
656: snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
657: #ifdef HAVE_LOGIN_CAP
658: if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
659: return 1;
660: #else
661: if (stat(buf, &st) >= 0)
662: return 1;
663: #endif
664: return 0;
1.1 markus 665: }
666:
667: /*
668: * Sets the value of the given variable in the environment. If the variable
669: * already exists, its value is overriden.
670: */
1.161 markus 671: void
1.45 markus 672: child_set_env(char ***envp, u_int *envsizep, const char *name,
1.112 deraadt 673: const char *value)
1.1 markus 674: {
1.164 markus 675: char **env;
676: u_int envsize;
1.45 markus 677: u_int i, namelen;
1.1 markus 678:
679: /*
680: * Find the slot where the value should be stored. If the variable
681: * already exists, we reuse the slot; otherwise we append a new slot
682: * at the end of the array, expanding if necessary.
683: */
684: env = *envp;
685: namelen = strlen(name);
686: for (i = 0; env[i]; i++)
687: if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
688: break;
689: if (env[i]) {
690: /* Reuse the slot. */
691: xfree(env[i]);
692: } else {
693: /* New variable. Expand if necessary. */
1.164 markus 694: envsize = *envsizep;
695: if (i >= envsize - 1) {
696: if (envsize >= 1000)
697: fatal("child_set_env: too many env vars");
698: envsize += 50;
1.197.2.1 brad 699: env = (*envp) = xrealloc(env, envsize, sizeof(char *));
1.164 markus 700: *envsizep = envsize;
1.1 markus 701: }
702: /* Need to set the NULL pointer at end of array beyond the new slot. */
703: env[i + 1] = NULL;
704: }
705:
706: /* Allocate space and format the variable in the appropriate slot. */
707: env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
708: snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
709: }
710:
711: /*
712: * Reads environment variables from the given file and adds/overrides them
713: * into the environment. If the file does not exist, this does nothing.
714: * Otherwise, it must consist of empty lines, comments (line starts with '#')
715: * and assignments of the form name=value. No other forms are allowed.
716: */
1.94 itojun 717: static void
1.45 markus 718: read_environment_file(char ***env, u_int *envsize,
1.112 deraadt 719: const char *filename)
1.1 markus 720: {
721: FILE *f;
722: char buf[4096];
723: char *cp, *value;
1.142 deraadt 724: u_int lineno = 0;
1.1 markus 725:
726: f = fopen(filename, "r");
727: if (!f)
728: return;
729:
730: while (fgets(buf, sizeof(buf), f)) {
1.142 deraadt 731: if (++lineno > 1000)
732: fatal("Too many lines in environment file %s", filename);
1.1 markus 733: for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
734: ;
735: if (!*cp || *cp == '#' || *cp == '\n')
736: continue;
737: if (strchr(cp, '\n'))
738: *strchr(cp, '\n') = '\0';
739: value = strchr(cp, '=');
740: if (value == NULL) {
1.142 deraadt 741: fprintf(stderr, "Bad line %u in %.100s\n", lineno,
742: filename);
1.1 markus 743: continue;
744: }
1.14 deraadt 745: /*
746: * Replace the equals sign by nul, and advance value to
747: * the value string.
748: */
1.1 markus 749: *value = '\0';
750: value++;
751: child_set_env(env, envsize, cp, value);
752: }
753: fclose(f);
754: }
755:
1.127 markus 756: static char **
757: do_setup_env(Session *s, const char *shell)
1.1 markus 758: {
759: char buf[256];
1.127 markus 760: u_int i, envsize;
1.154 markus 761: char **env, *laddr;
1.127 markus 762: struct passwd *pw = s->pw;
1.1 markus 763:
764: /* Initialize the environment. */
765: envsize = 100;
1.197.2.2! brad 766: env = xcalloc(envsize, sizeof(char *));
1.1 markus 767: env[0] = NULL;
768:
1.161 markus 769: #ifdef GSSAPI
1.168 djm 770: /* Allow any GSSAPI methods that we've used to alter
1.161 markus 771: * the childs environment as they see fit
772: */
773: ssh_gssapi_do_child(&env, &envsize);
774: #endif
775:
1.1 markus 776: if (!options.use_login) {
777: /* Set basic environment. */
1.173 djm 778: for (i = 0; i < s->num_env; i++)
1.178 deraadt 779: child_set_env(&env, &envsize, s->env[i].name,
1.173 djm 780: s->env[i].val);
781:
1.1 markus 782: child_set_env(&env, &envsize, "USER", pw->pw_name);
783: child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
784: child_set_env(&env, &envsize, "HOME", pw->pw_dir);
1.28 millert 785: #ifdef HAVE_LOGIN_CAP
1.145 markus 786: if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
787: child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
788: else
789: child_set_env(&env, &envsize, "PATH", getenv("PATH"));
1.28 millert 790: #else
1.29 millert 791: child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
1.28 millert 792: #endif
1.1 markus 793:
794: snprintf(buf, sizeof buf, "%.200s/%.50s",
795: _PATH_MAILDIR, pw->pw_name);
796: child_set_env(&env, &envsize, "MAIL", buf);
797:
798: /* Normal systems set SHELL by default. */
799: child_set_env(&env, &envsize, "SHELL", shell);
800: }
801: if (getenv("TZ"))
802: child_set_env(&env, &envsize, "TZ", getenv("TZ"));
803:
804: /* Set custom environment options from RSA authentication. */
1.110 markus 805: if (!options.use_login) {
806: while (custom_environment) {
807: struct envstring *ce = custom_environment;
1.143 deraadt 808: char *str = ce->s;
1.127 markus 809:
1.143 deraadt 810: for (i = 0; str[i] != '=' && str[i]; i++)
1.110 markus 811: ;
1.143 deraadt 812: if (str[i] == '=') {
813: str[i] = 0;
814: child_set_env(&env, &envsize, str, str + i + 1);
1.110 markus 815: }
816: custom_environment = ce->next;
817: xfree(ce->s);
818: xfree(ce);
1.1 markus 819: }
820: }
821:
1.149 stevesk 822: /* SSH_CLIENT deprecated */
1.1 markus 823: snprintf(buf, sizeof buf, "%.50s %d %d",
1.127 markus 824: get_remote_ipaddr(), get_remote_port(), get_local_port());
1.1 markus 825: child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1.149 stevesk 826:
1.154 markus 827: laddr = get_local_ipaddr(packet_get_connection_in());
1.149 stevesk 828: snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
1.154 markus 829: get_remote_ipaddr(), get_remote_port(), laddr, get_local_port());
830: xfree(laddr);
1.149 stevesk 831: child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
1.1 markus 832:
1.60 markus 833: if (s->ttyfd != -1)
834: child_set_env(&env, &envsize, "SSH_TTY", s->tty);
835: if (s->term)
836: child_set_env(&env, &envsize, "TERM", s->term);
837: if (s->display)
838: child_set_env(&env, &envsize, "DISPLAY", s->display);
1.34 markus 839: if (original_command)
840: child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
841: original_command);
1.96 dugsong 842: #ifdef KRB5
843: if (s->authctxt->krb5_ticket_file)
844: child_set_env(&env, &envsize, "KRB5CCNAME",
1.112 deraadt 845: s->authctxt->krb5_ticket_file);
1.96 dugsong 846: #endif
1.136 markus 847: if (auth_sock_name != NULL)
1.1 markus 848: child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1.136 markus 849: auth_sock_name);
1.1 markus 850:
851: /* read $HOME/.ssh/environment. */
1.146 markus 852: if (options.permit_user_env && !options.use_login) {
1.14 deraadt 853: snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
854: pw->pw_dir);
1.1 markus 855: read_environment_file(&env, &envsize, buf);
856: }
857: if (debug_flag) {
858: /* dump the environment */
859: fprintf(stderr, "Environment:\n");
860: for (i = 0; env[i]; i++)
861: fprintf(stderr, " %.200s\n", env[i]);
862: }
1.127 markus 863: return env;
864: }
865:
866: /*
867: * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
868: * first in this order).
869: */
870: static void
871: do_rc_files(Session *s, const char *shell)
872: {
873: FILE *f = NULL;
874: char cmd[1024];
875: int do_xauth;
876: struct stat st;
877:
878: do_xauth =
879: s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
880:
881: /* ignore _PATH_SSH_USER_RC for subsystems */
882: if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
883: snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
884: shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
885: if (debug_flag)
886: fprintf(stderr, "Running %s\n", cmd);
887: f = popen(cmd, "w");
888: if (f) {
889: if (do_xauth)
890: fprintf(f, "%s %s\n", s->auth_proto,
891: s->auth_data);
892: pclose(f);
893: } else
894: fprintf(stderr, "Could not run %s\n",
895: _PATH_SSH_USER_RC);
896: } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
897: if (debug_flag)
898: fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
899: _PATH_SSH_SYSTEM_RC);
900: f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
901: if (f) {
902: if (do_xauth)
903: fprintf(f, "%s %s\n", s->auth_proto,
904: s->auth_data);
905: pclose(f);
906: } else
907: fprintf(stderr, "Could not run %s\n",
908: _PATH_SSH_SYSTEM_RC);
909: } else if (do_xauth && options.xauth_location != NULL) {
910: /* Add authority data to .Xauthority if appropriate. */
911: if (debug_flag) {
912: fprintf(stderr,
1.151 stevesk 913: "Running %.500s remove %.100s\n",
1.165 markus 914: options.xauth_location, s->auth_display);
1.151 stevesk 915: fprintf(stderr,
916: "%.500s add %.100s %.100s %.100s\n",
1.127 markus 917: options.xauth_location, s->auth_display,
918: s->auth_proto, s->auth_data);
919: }
920: snprintf(cmd, sizeof cmd, "%s -q -",
921: options.xauth_location);
922: f = popen(cmd, "w");
923: if (f) {
1.151 stevesk 924: fprintf(f, "remove %s\n",
925: s->auth_display);
1.127 markus 926: fprintf(f, "add %s %s %s\n",
927: s->auth_display, s->auth_proto,
928: s->auth_data);
929: pclose(f);
930: } else {
931: fprintf(stderr, "Could not run %s\n",
932: cmd);
933: }
934: }
935: }
936:
937: static void
938: do_nologin(struct passwd *pw)
939: {
940: FILE *f = NULL;
941: char buf[1024];
942:
943: #ifdef HAVE_LOGIN_CAP
944: if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
945: f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
946: _PATH_NOLOGIN), "r");
947: #else
948: if (pw->pw_uid)
949: f = fopen(_PATH_NOLOGIN, "r");
950: #endif
951: if (f) {
952: /* /etc/nologin exists. Print its contents and exit. */
1.155 itojun 953: logit("User %.100s not allowed because %s exists",
1.150 stevesk 954: pw->pw_name, _PATH_NOLOGIN);
1.127 markus 955: while (fgets(buf, sizeof(buf), f))
956: fputs(buf, stderr);
957: fclose(f);
958: exit(254);
959: }
960: }
961:
962: /* Set login name, uid, gid, and groups. */
1.130 provos 963: void
1.127 markus 964: do_setusercontext(struct passwd *pw)
965: {
966: if (getuid() == 0 || geteuid() == 0) {
967: #ifdef HAVE_LOGIN_CAP
968: if (setusercontext(lc, pw, pw->pw_uid,
969: (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
970: perror("unable to set user context");
971: exit(1);
972: }
973: #else
974: if (setlogin(pw->pw_name) < 0)
975: error("setlogin failed: %s", strerror(errno));
976: if (setgid(pw->pw_gid) < 0) {
977: perror("setgid");
978: exit(1);
979: }
980: /* Initialize the group list. */
981: if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
982: perror("initgroups");
983: exit(1);
984: }
985: endgrent();
986:
987: /* Permanently switch to the desired uid. */
988: permanently_set_uid(pw);
989: #endif
990: }
991: if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
992: fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
993: }
994:
1.131 markus 995: static void
1.172 markus 996: do_pwchange(Session *s)
997: {
1.179 dtucker 998: fflush(NULL);
1.172 markus 999: fprintf(stderr, "WARNING: Your password has expired.\n");
1000: if (s->ttyfd != -1) {
1.178 deraadt 1001: fprintf(stderr,
1.172 markus 1002: "You must change your password now and login again!\n");
1003: execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL);
1004: perror("passwd");
1005: } else {
1006: fprintf(stderr,
1007: "Password change required but no TTY available.\n");
1008: }
1009: exit(1);
1010: }
1011:
1012: static void
1.130 provos 1013: launch_login(struct passwd *pw, const char *hostname)
1014: {
1015: /* Launch login(1). */
1016:
1017: execl("/usr/bin/login", "login", "-h", hostname,
1018: "-p", "-f", "--", pw->pw_name, (char *)NULL);
1019:
1020: /* Login couldn't be executed, die. */
1021:
1022: perror("login");
1023: exit(1);
1024: }
1025:
1.172 markus 1026: static void
1027: child_close_fds(void)
1028: {
1029: int i;
1030:
1031: if (packet_get_connection_in() == packet_get_connection_out())
1032: close(packet_get_connection_in());
1033: else {
1034: close(packet_get_connection_in());
1035: close(packet_get_connection_out());
1036: }
1037: /*
1038: * Close all descriptors related to channels. They will still remain
1039: * open in the parent.
1040: */
1041: /* XXX better use close-on-exec? -markus */
1042: channel_close_all();
1043:
1044: /*
1045: * Close any extra file descriptors. Note that there may still be
1046: * descriptors left by system functions. They will be closed later.
1047: */
1048: endpwent();
1049:
1050: /*
1.188 djm 1051: * Close any extra open file descriptors so that we don't have them
1.172 markus 1052: * hanging around in clients. Note that we want to do this after
1053: * initgroups, because at least on Solaris 2.3 it leaves file
1054: * descriptors open.
1055: */
1056: for (i = 3; i < 64; i++)
1057: close(i);
1058: }
1059:
1.127 markus 1060: /*
1061: * Performs common processing for the child, such as setting up the
1062: * environment, closing extra file descriptors, setting the user and group
1063: * ids, and executing the command or shell.
1064: */
1065: void
1066: do_child(Session *s, const char *command)
1067: {
1068: extern char **environ;
1069: char **env;
1070: char *argv[10];
1071: const char *shell, *shell0, *hostname = NULL;
1072: struct passwd *pw = s->pw;
1073:
1074: /* remove hostkey from the child's memory */
1075: destroy_sensitive_data();
1076:
1.172 markus 1077: /* Force a password change */
1078: if (s->authctxt->force_pwchange) {
1079: do_setusercontext(pw);
1080: child_close_fds();
1081: do_pwchange(s);
1082: exit(1);
1083: }
1084:
1.127 markus 1085: /* login(1) is only called if we execute the login shell */
1086: if (options.use_login && command != NULL)
1087: options.use_login = 0;
1088:
1089: /*
1090: * Login(1) does this as well, and it needs uid 0 for the "-h"
1091: * switch, so we let login(1) to this for us.
1092: */
1093: if (!options.use_login) {
1094: do_nologin(pw);
1095: do_setusercontext(pw);
1096: }
1097:
1098: /*
1099: * Get the shell from the password data. An empty shell field is
1100: * legal, and means /bin/sh.
1101: */
1102: shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1.152 markus 1103:
1104: /*
1105: * Make sure $SHELL points to the shell from the password file,
1106: * even if shell is overridden from login.conf
1107: */
1108: env = do_setup_env(s, shell);
1109:
1.127 markus 1110: #ifdef HAVE_LOGIN_CAP
1111: shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1112: #endif
1113:
1.26 millert 1114: /* we have to stash the hostname before we close our socket. */
1115: if (options.use_login)
1.70 stevesk 1116: hostname = get_remote_name_or_ip(utmp_len,
1.158 markus 1117: options.use_dns);
1.1 markus 1118: /*
1119: * Close the connection descriptors; note that this is the child, and
1120: * the server will still have the socket open, and it is important
1121: * that we do not shutdown it. Note that the descriptors cannot be
1122: * closed before building the environment, as we call
1123: * get_remote_ipaddr there.
1124: */
1.172 markus 1125: child_close_fds();
1.1 markus 1126:
1127: /*
1.125 deraadt 1128: * Must take new environment into use so that .ssh/rc,
1129: * /etc/ssh/sshrc and xauth are run in the proper environment.
1.1 markus 1130: */
1131: environ = env;
1.170 jakob 1132:
1133: #ifdef KRB5
1134: /*
1135: * At this point, we check to see if AFS is active and if we have
1136: * a valid Kerberos 5 TGT. If so, it seems like a good idea to see
1137: * if we can (and need to) extend the ticket into an AFS token. If
1138: * we don't do this, we run into potential problems if the user's
1139: * home directory is in AFS and it's not world-readable.
1140: */
1141:
1142: if (options.kerberos_get_afs_token && k_hasafs() &&
1.185 djm 1143: (s->authctxt->krb5_ctx != NULL)) {
1.170 jakob 1144: char cell[64];
1145:
1146: debug("Getting AFS token");
1147:
1148: k_setpag();
1149:
1150: if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1151: krb5_afslog(s->authctxt->krb5_ctx,
1152: s->authctxt->krb5_fwd_ccache, cell, NULL);
1153:
1154: krb5_afslog_home(s->authctxt->krb5_ctx,
1155: s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir);
1156: }
1157: #endif
1.104 markus 1158:
1.188 djm 1159: /* Change current directory to the user's home directory. */
1.104 markus 1160: if (chdir(pw->pw_dir) < 0) {
1161: fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1162: pw->pw_dir, strerror(errno));
1163: #ifdef HAVE_LOGIN_CAP
1164: if (login_getcapbool(lc, "requirehome", 0))
1165: exit(1);
1166: #endif
1167: }
1.1 markus 1168:
1.127 markus 1169: if (!options.use_login)
1170: do_rc_files(s, shell);
1.67 markus 1171:
1172: /* restore SIGPIPE for child */
1.197.2.1 brad 1173: signal(SIGPIPE, SIG_DFL);
1.67 markus 1174:
1.127 markus 1175: if (options.use_login) {
1.130 provos 1176: launch_login(pw, hostname);
1177: /* NEVERREACHED */
1.127 markus 1178: }
1179:
1180: /* Get the last component of the shell name. */
1181: if ((shell0 = strrchr(shell, '/')) != NULL)
1182: shell0++;
1183: else
1184: shell0 = shell;
1185:
1.1 markus 1186: /*
1187: * If we have no command, execute the shell. In this case, the shell
1188: * name to be passed in argv[0] is preceded by '-' to indicate that
1189: * this is a login shell.
1190: */
1191: if (!command) {
1.127 markus 1192: char argv0[256];
1.1 markus 1193:
1.127 markus 1194: /* Start the shell. Set initial character to '-'. */
1195: argv0[0] = '-';
1.1 markus 1196:
1.127 markus 1197: if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1.128 markus 1198: >= sizeof(argv0) - 1) {
1.127 markus 1199: errno = EINVAL;
1.1 markus 1200: perror(shell);
1201: exit(1);
1.127 markus 1202: }
1.1 markus 1203:
1.127 markus 1204: /* Execute the shell. */
1205: argv[0] = argv0;
1206: argv[1] = NULL;
1207: execve(shell, argv, env);
1208:
1209: /* Executing the shell failed. */
1210: perror(shell);
1211: exit(1);
1.1 markus 1212: }
1213: /*
1214: * Execute the command using the user's shell. This uses the -c
1215: * option to execute the command.
1216: */
1.127 markus 1217: argv[0] = (char *) shell0;
1.1 markus 1218: argv[1] = "-c";
1219: argv[2] = (char *) command;
1220: argv[3] = NULL;
1221: execve(shell, argv, env);
1222: perror(shell);
1223: exit(1);
1224: }
1225:
1226: Session *
1227: session_new(void)
1228: {
1229: int i;
1230: static int did_init = 0;
1231: if (!did_init) {
1232: debug("session_new: init");
1.112 deraadt 1233: for (i = 0; i < MAX_SESSIONS; i++) {
1.1 markus 1234: sessions[i].used = 0;
1235: }
1236: did_init = 1;
1237: }
1.112 deraadt 1238: for (i = 0; i < MAX_SESSIONS; i++) {
1.1 markus 1239: Session *s = &sessions[i];
1240: if (! s->used) {
1.68 djm 1241: memset(s, 0, sizeof(*s));
1.1 markus 1242: s->chanid = -1;
1243: s->ptyfd = -1;
1244: s->ttyfd = -1;
1245: s->used = 1;
1.85 markus 1246: s->self = i;
1.184 djm 1247: s->x11_chanids = NULL;
1.1 markus 1248: debug("session_new: session %d", i);
1249: return s;
1250: }
1251: }
1252: return NULL;
1253: }
1254:
1.94 itojun 1255: static void
1.1 markus 1256: session_dump(void)
1257: {
1258: int i;
1.112 deraadt 1259: for (i = 0; i < MAX_SESSIONS; i++) {
1.1 markus 1260: Session *s = &sessions[i];
1.137 mpech 1261: debug("dump: used %d session %d %p channel %d pid %ld",
1.1 markus 1262: s->used,
1263: s->self,
1264: s,
1265: s->chanid,
1.137 mpech 1266: (long)s->pid);
1.1 markus 1267: }
1268: }
1269:
1.2 markus 1270: int
1.97 markus 1271: session_open(Authctxt *authctxt, int chanid)
1.2 markus 1272: {
1273: Session *s = session_new();
1274: debug("session_open: channel %d", chanid);
1275: if (s == NULL) {
1276: error("no more sessions");
1277: return 0;
1278: }
1.97 markus 1279: s->authctxt = authctxt;
1280: s->pw = authctxt->pw;
1.167 djm 1281: if (s->pw == NULL || !authctxt->valid)
1.54 stevesk 1282: fatal("no user for session %d", s->self);
1.2 markus 1283: debug("session_open: session %d: link with channel %d", s->self, chanid);
1284: s->chanid = chanid;
1285: return 1;
1286: }
1287:
1.130 provos 1288: Session *
1289: session_by_tty(char *tty)
1290: {
1291: int i;
1292: for (i = 0; i < MAX_SESSIONS; i++) {
1293: Session *s = &sessions[i];
1294: if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1295: debug("session_by_tty: session %d tty %s", i, tty);
1296: return s;
1297: }
1298: }
1299: debug("session_by_tty: unknown tty %.100s", tty);
1300: session_dump();
1301: return NULL;
1302: }
1303:
1.94 itojun 1304: static Session *
1.2 markus 1305: session_by_channel(int id)
1306: {
1307: int i;
1.112 deraadt 1308: for (i = 0; i < MAX_SESSIONS; i++) {
1.2 markus 1309: Session *s = &sessions[i];
1310: if (s->used && s->chanid == id) {
1311: debug("session_by_channel: session %d channel %d", i, id);
1312: return s;
1313: }
1314: }
1315: debug("session_by_channel: unknown channel %d", id);
1316: session_dump();
1317: return NULL;
1318: }
1319:
1.94 itojun 1320: static Session *
1.184 djm 1321: session_by_x11_channel(int id)
1322: {
1323: int i, j;
1324:
1325: for (i = 0; i < MAX_SESSIONS; i++) {
1326: Session *s = &sessions[i];
1327:
1328: if (s->x11_chanids == NULL || !s->used)
1329: continue;
1330: for (j = 0; s->x11_chanids[j] != -1; j++) {
1331: if (s->x11_chanids[j] == id) {
1332: debug("session_by_x11_channel: session %d "
1333: "channel %d", s->self, id);
1334: return s;
1335: }
1336: }
1337: }
1338: debug("session_by_x11_channel: unknown channel %d", id);
1339: session_dump();
1340: return NULL;
1341: }
1342:
1343: static Session *
1.2 markus 1344: session_by_pid(pid_t pid)
1345: {
1346: int i;
1.137 mpech 1347: debug("session_by_pid: pid %ld", (long)pid);
1.112 deraadt 1348: for (i = 0; i < MAX_SESSIONS; i++) {
1.2 markus 1349: Session *s = &sessions[i];
1350: if (s->used && s->pid == pid)
1351: return s;
1352: }
1.137 mpech 1353: error("session_by_pid: unknown pid %ld", (long)pid);
1.2 markus 1354: session_dump();
1355: return NULL;
1356: }
1357:
1.94 itojun 1358: static int
1.2 markus 1359: session_window_change_req(Session *s)
1360: {
1361: s->col = packet_get_int();
1362: s->row = packet_get_int();
1363: s->xpixel = packet_get_int();
1364: s->ypixel = packet_get_int();
1.116 markus 1365: packet_check_eom();
1.2 markus 1366: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1367: return 1;
1368: }
1369:
1.94 itojun 1370: static int
1.2 markus 1371: session_pty_req(Session *s)
1372: {
1.45 markus 1373: u_int len;
1.72 stevesk 1374: int n_bytes;
1.132 markus 1375:
1.86 markus 1376: if (no_pty_flag) {
1377: debug("Allocating a pty not permitted for this authentication.");
1.19 markus 1378: return 0;
1.86 markus 1379: }
1380: if (s->ttyfd != -1) {
1381: packet_disconnect("Protocol error: you already have a pty.");
1.3 markus 1382: return 0;
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;
1.197.2.1 brad 1437: char *prog, *cmd, *subsys = packet_get_string(&len);
1.182 djm 1438: u_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) {
1.197.2.1 brad 1445: prog = options.subsystem_command[i];
1446: cmd = options.subsystem_args[i];
1447: if (stat(prog, &st) < 0) {
1448: error("subsystem: cannot stat %s: %s", prog,
1.105 markus 1449: strerror(errno));
1450: break;
1451: }
1452: debug("subsystem: exec() %s", cmd);
1.64 markus 1453: s->is_subsystem = 1;
1.105 markus 1454: do_exec(s, cmd);
1.18 jakob 1455: success = 1;
1.122 markus 1456: break;
1.18 jakob 1457: }
1458: }
1459:
1460: if (!success)
1.155 itojun 1461: logit("subsystem request for %.100s failed, subsystem not found",
1.105 markus 1462: subsys);
1.7 markus 1463:
1464: xfree(subsys);
1465: return success;
1466: }
1467:
1.94 itojun 1468: static int
1.7 markus 1469: session_x11_req(Session *s)
1470: {
1.81 markus 1471: int success;
1.7 markus 1472:
1.184 djm 1473: if (s->auth_proto != NULL || s->auth_data != NULL) {
1474: error("session_x11_req: session %d: "
1.190 stevesk 1475: "x11 forwarding already active", s->self);
1.184 djm 1476: return 0;
1477: }
1.7 markus 1478: s->single_connection = packet_get_char();
1479: s->auth_proto = packet_get_string(NULL);
1480: s->auth_data = packet_get_string(NULL);
1481: s->screen = packet_get_int();
1.116 markus 1482: packet_check_eom();
1.7 markus 1483:
1.81 markus 1484: success = session_setup_x11fwd(s);
1485: if (!success) {
1.7 markus 1486: xfree(s->auth_proto);
1487: xfree(s->auth_data);
1.84 markus 1488: s->auth_proto = NULL;
1489: s->auth_data = NULL;
1.7 markus 1490: }
1.81 markus 1491: return success;
1.7 markus 1492: }
1493:
1.94 itojun 1494: static int
1.19 markus 1495: session_shell_req(Session *s)
1496: {
1.116 markus 1497: packet_check_eom();
1.90 markus 1498: do_exec(s, NULL);
1.19 markus 1499: return 1;
1500: }
1501:
1.94 itojun 1502: static int
1.19 markus 1503: session_exec_req(Session *s)
1504: {
1.45 markus 1505: u_int len;
1.19 markus 1506: char *command = packet_get_string(&len);
1.116 markus 1507: packet_check_eom();
1.90 markus 1508: do_exec(s, command);
1.92 markus 1509: xfree(command);
1.19 markus 1510: return 1;
1511: }
1512:
1.94 itojun 1513: static int
1.157 markus 1514: session_break_req(Session *s)
1515: {
1516:
1.175 deraadt 1517: packet_get_int(); /* ignored */
1.157 markus 1518: packet_check_eom();
1519:
1.160 markus 1520: if (s->ttyfd == -1 ||
1521: tcsendbreak(s->ttyfd, 0) < 0)
1.157 markus 1522: return 0;
1523: return 1;
1524: }
1525:
1526: static int
1.173 djm 1527: session_env_req(Session *s)
1528: {
1529: char *name, *val;
1530: u_int name_len, val_len, i;
1531:
1532: name = packet_get_string(&name_len);
1533: val = packet_get_string(&val_len);
1534: packet_check_eom();
1535:
1536: /* Don't set too many environment variables */
1537: if (s->num_env > 128) {
1538: debug2("Ignoring env request %s: too many env vars", name);
1539: goto fail;
1540: }
1541:
1542: for (i = 0; i < options.num_accept_env; i++) {
1543: if (match_pattern(name, options.accept_env[i])) {
1544: debug2("Setting env %d: %s=%s", s->num_env, name, val);
1.197.2.1 brad 1545: s->env = xrealloc(s->env, s->num_env + 1,
1546: sizeof(*s->env));
1.173 djm 1547: s->env[s->num_env].name = name;
1548: s->env[s->num_env].val = val;
1549: s->num_env++;
1550: return (1);
1551: }
1552: }
1553: debug2("Ignoring env request %s: disallowed name", name);
1554:
1555: fail:
1556: xfree(name);
1557: xfree(val);
1558: return (0);
1559: }
1560:
1561: static int
1.43 markus 1562: session_auth_agent_req(Session *s)
1563: {
1564: static int called = 0;
1.116 markus 1565: packet_check_eom();
1.44 markus 1566: if (no_agent_forwarding_flag) {
1567: debug("session_auth_agent_req: no_agent_forwarding_flag");
1568: return 0;
1569: }
1.43 markus 1570: if (called) {
1571: return 0;
1572: } else {
1573: called = 1;
1574: return auth_input_request_forwarding(s->pw);
1575: }
1576: }
1577:
1.123 markus 1578: int
1579: session_input_channel_req(Channel *c, const char *rtype)
1.2 markus 1580: {
1581: int success = 0;
1582: Session *s;
1583:
1.123 markus 1584: if ((s = session_by_channel(c->self)) == NULL) {
1.155 itojun 1585: logit("session_input_channel_req: no session %d req %.100s",
1.123 markus 1586: c->self, rtype);
1587: return 0;
1588: }
1589: debug("session_input_channel_req: session %d req %s", s->self, rtype);
1.2 markus 1590:
1591: /*
1.64 markus 1592: * a session is in LARVAL state until a shell, a command
1593: * or a subsystem is executed
1.2 markus 1594: */
1595: if (c->type == SSH_CHANNEL_LARVAL) {
1596: if (strcmp(rtype, "shell") == 0) {
1.19 markus 1597: success = session_shell_req(s);
1.2 markus 1598: } else if (strcmp(rtype, "exec") == 0) {
1.19 markus 1599: success = session_exec_req(s);
1.2 markus 1600: } else if (strcmp(rtype, "pty-req") == 0) {
1.3 markus 1601: success = session_pty_req(s);
1.7 markus 1602: } else if (strcmp(rtype, "x11-req") == 0) {
1603: success = session_x11_req(s);
1.43 markus 1604: } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1605: success = session_auth_agent_req(s);
1.7 markus 1606: } else if (strcmp(rtype, "subsystem") == 0) {
1607: success = session_subsystem_req(s);
1.173 djm 1608: } else if (strcmp(rtype, "env") == 0) {
1609: success = session_env_req(s);
1.2 markus 1610: }
1611: }
1612: if (strcmp(rtype, "window-change") == 0) {
1613: success = session_window_change_req(s);
1.177 djm 1614: } else if (strcmp(rtype, "break") == 0) {
1615: success = session_break_req(s);
1.2 markus 1616: }
1.177 djm 1617:
1.123 markus 1618: return success;
1.2 markus 1619: }
1620:
1621: void
1622: session_set_fds(Session *s, int fdin, int fdout, int fderr)
1623: {
1624: if (!compat20)
1625: fatal("session_set_fds: called for proto != 2.0");
1626: /*
1627: * now that have a child and a pipe to the child,
1628: * we can activate our channel and register the fd's
1629: */
1630: if (s->chanid == -1)
1631: fatal("no channel for session %d", s->self);
1632: channel_set_fds(s->chanid,
1633: fdout, fdin, fderr,
1.42 markus 1634: fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1.126 markus 1635: 1,
1636: CHAN_SES_WINDOW_DEFAULT);
1.2 markus 1637: }
1638:
1.85 markus 1639: /*
1640: * Function to perform pty cleanup. Also called if we get aborted abnormally
1641: * (e.g., due to a dropped connection).
1642: */
1.130 provos 1643: void
1.165 markus 1644: session_pty_cleanup2(Session *s)
1.1 markus 1645: {
1.85 markus 1646: if (s == NULL) {
1647: error("session_pty_cleanup: no session");
1648: return;
1649: }
1650: if (s->ttyfd == -1)
1.1 markus 1651: return;
1652:
1.54 stevesk 1653: debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
1.1 markus 1654:
1655: /* Record that the user has logged out. */
1.85 markus 1656: if (s->pid != 0)
1657: record_logout(s->pid, s->tty);
1.1 markus 1658:
1659: /* Release the pseudo-tty. */
1.130 provos 1660: if (getuid() == 0)
1661: pty_release(s->tty);
1.1 markus 1662:
1663: /*
1664: * Close the server side of the socket pairs. We must do this after
1665: * the pty cleanup, so that another process doesn't get this pty
1666: * while we're still cleaning up.
1667: */
1668: if (close(s->ptymaster) < 0)
1.130 provos 1669: error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
1.108 markus 1670:
1671: /* unlink pty from session */
1672: s->ttyfd = -1;
1.2 markus 1673: }
1674:
1.130 provos 1675: void
1.165 markus 1676: session_pty_cleanup(Session *s)
1.130 provos 1677: {
1.165 markus 1678: PRIVSEP(session_pty_cleanup2(s));
1.130 provos 1679: }
1680:
1.147 markus 1681: static char *
1682: sig2name(int sig)
1683: {
1684: #define SSH_SIG(x) if (sig == SIG ## x) return #x
1685: SSH_SIG(ABRT);
1686: SSH_SIG(ALRM);
1687: SSH_SIG(FPE);
1688: SSH_SIG(HUP);
1689: SSH_SIG(ILL);
1690: SSH_SIG(INT);
1691: SSH_SIG(KILL);
1692: SSH_SIG(PIPE);
1693: SSH_SIG(QUIT);
1694: SSH_SIG(SEGV);
1695: SSH_SIG(TERM);
1696: SSH_SIG(USR1);
1697: SSH_SIG(USR2);
1698: #undef SSH_SIG
1699: return "SIG@openssh.com";
1700: }
1701:
1.94 itojun 1702: static void
1.184 djm 1703: session_close_x11(int id)
1704: {
1705: Channel *c;
1706:
1.189 markus 1707: if ((c = channel_by_id(id)) == NULL) {
1.184 djm 1708: debug("session_close_x11: x11 channel %d missing", id);
1709: } else {
1710: /* Detach X11 listener */
1711: debug("session_close_x11: detach x11 channel %d", id);
1712: channel_cancel_cleanup(id);
1713: if (c->ostate != CHAN_OUTPUT_CLOSED)
1714: chan_mark_dead(c);
1715: }
1716: }
1717:
1718: static void
1719: session_close_single_x11(int id, void *arg)
1720: {
1721: Session *s;
1722: u_int i;
1723:
1724: debug3("session_close_single_x11: channel %d", id);
1725: channel_cancel_cleanup(id);
1726: if ((s = session_by_x11_channel(id)) == NULL)
1727: fatal("session_close_single_x11: no x11 channel %d", id);
1728: for (i = 0; s->x11_chanids[i] != -1; i++) {
1729: debug("session_close_single_x11: session %d: "
1730: "closing channel %d", s->self, s->x11_chanids[i]);
1731: /*
1732: * The channel "id" is already closing, but make sure we
1733: * close all of its siblings.
1734: */
1735: if (s->x11_chanids[i] != id)
1736: session_close_x11(s->x11_chanids[i]);
1737: }
1738: xfree(s->x11_chanids);
1739: s->x11_chanids = NULL;
1740: if (s->display) {
1741: xfree(s->display);
1742: s->display = NULL;
1743: }
1744: if (s->auth_proto) {
1745: xfree(s->auth_proto);
1746: s->auth_proto = NULL;
1747: }
1748: if (s->auth_data) {
1749: xfree(s->auth_data);
1750: s->auth_data = NULL;
1751: }
1752: if (s->auth_display) {
1753: xfree(s->auth_display);
1754: s->auth_display = NULL;
1755: }
1756: }
1757:
1758: static void
1.2 markus 1759: session_exit_message(Session *s, int status)
1760: {
1761: Channel *c;
1.124 markus 1762:
1763: if ((c = channel_lookup(s->chanid)) == NULL)
1.85 markus 1764: fatal("session_exit_message: session %d: no channel %d",
1.2 markus 1765: s->self, s->chanid);
1.137 mpech 1766: debug("session_exit_message: session %d channel %d pid %ld",
1767: s->self, s->chanid, (long)s->pid);
1.2 markus 1768:
1769: if (WIFEXITED(status)) {
1.124 markus 1770: channel_request_start(s->chanid, "exit-status", 0);
1.2 markus 1771: packet_put_int(WEXITSTATUS(status));
1772: packet_send();
1773: } else if (WIFSIGNALED(status)) {
1.124 markus 1774: channel_request_start(s->chanid, "exit-signal", 0);
1.147 markus 1775: packet_put_cstring(sig2name(WTERMSIG(status)));
1.2 markus 1776: packet_put_char(WCOREDUMP(status));
1777: packet_put_cstring("");
1778: packet_put_cstring("");
1779: packet_send();
1780: } else {
1781: /* Some weird exit cause. Just exit. */
1782: packet_disconnect("wait returned status %04x.", status);
1783: }
1784:
1785: /* disconnect channel */
1786: debug("session_exit_message: release channel %d", s->chanid);
1.187 djm 1787:
1788: /*
1789: * Adjust cleanup callback attachment to send close messages when
1.197.2.1 brad 1790: * the channel gets EOF. The session will be then be closed
1.187 djm 1791: * by session_close_by_channel when the childs close their fds.
1792: */
1793: channel_register_cleanup(c->self, session_close_by_channel, 1);
1794:
1.5 markus 1795: /*
1796: * emulate a write failure with 'chan_write_failed', nobody will be
1797: * interested in data we write.
1798: * Note that we must not call 'chan_read_failed', since there could
1799: * be some more data waiting in the pipe.
1800: */
1.8 markus 1801: if (c->ostate != CHAN_OUTPUT_CLOSED)
1802: chan_write_failed(c);
1.2 markus 1803: }
1804:
1.130 provos 1805: void
1.85 markus 1806: session_close(Session *s)
1.2 markus 1807: {
1.182 djm 1808: u_int i;
1.173 djm 1809:
1.137 mpech 1810: debug("session_close: session %d pid %ld", s->self, (long)s->pid);
1.165 markus 1811: if (s->ttyfd != -1)
1.85 markus 1812: session_pty_cleanup(s);
1.2 markus 1813: if (s->term)
1814: xfree(s->term);
1815: if (s->display)
1816: xfree(s->display);
1.184 djm 1817: if (s->x11_chanids)
1818: xfree(s->x11_chanids);
1.118 stevesk 1819: if (s->auth_display)
1820: xfree(s->auth_display);
1.2 markus 1821: if (s->auth_data)
1822: xfree(s->auth_data);
1823: if (s->auth_proto)
1824: xfree(s->auth_proto);
1825: s->used = 0;
1.197.2.1 brad 1826: if (s->env != NULL) {
1827: for (i = 0; i < s->num_env; i++) {
1828: xfree(s->env[i].name);
1829: xfree(s->env[i].val);
1830: }
1.173 djm 1831: xfree(s->env);
1.197.2.1 brad 1832: }
1.9 markus 1833: session_proctitle(s);
1.2 markus 1834: }
1835:
1836: void
1837: session_close_by_pid(pid_t pid, int status)
1838: {
1839: Session *s = session_by_pid(pid);
1840: if (s == NULL) {
1.137 mpech 1841: debug("session_close_by_pid: no session for pid %ld",
1842: (long)pid);
1.2 markus 1843: return;
1844: }
1845: if (s->chanid != -1)
1846: session_exit_message(s, status);
1.187 djm 1847: if (s->ttyfd != -1)
1848: session_pty_cleanup(s);
1.197 djm 1849: s->pid = 0;
1.98 markus 1850: }
1851:
1.2 markus 1852: /*
1853: * this is called when a channel dies before
1854: * the session 'child' itself dies
1855: */
1856: void
1857: session_close_by_channel(int id, void *arg)
1858: {
1859: Session *s = session_by_channel(id);
1.187 djm 1860: u_int i;
1.184 djm 1861:
1.2 markus 1862: if (s == NULL) {
1.107 markus 1863: debug("session_close_by_channel: no session for id %d", id);
1.2 markus 1864: return;
1865: }
1.137 mpech 1866: debug("session_close_by_channel: channel %d child %ld",
1867: id, (long)s->pid);
1.107 markus 1868: if (s->pid != 0) {
1869: debug("session_close_by_channel: channel %d: has child", id);
1.108 markus 1870: /*
1871: * delay detach of session, but release pty, since
1872: * the fd's to the child are already closed
1873: */
1.165 markus 1874: if (s->ttyfd != -1)
1.108 markus 1875: session_pty_cleanup(s);
1.107 markus 1876: return;
1877: }
1878: /* detach by removing callback */
1.2 markus 1879: channel_cancel_cleanup(s->chanid);
1.187 djm 1880:
1881: /* Close any X11 listeners associated with this session */
1882: if (s->x11_chanids != NULL) {
1883: for (i = 0; s->x11_chanids[i] != -1; i++) {
1884: session_close_x11(s->x11_chanids[i]);
1885: s->x11_chanids[i] = -1;
1886: }
1887: }
1888:
1.2 markus 1889: s->chanid = -1;
1.106 markus 1890: session_close(s);
1891: }
1892:
1893: void
1.130 provos 1894: session_destroy_all(void (*closefunc)(Session *))
1.106 markus 1895: {
1896: int i;
1.112 deraadt 1897: for (i = 0; i < MAX_SESSIONS; i++) {
1.106 markus 1898: Session *s = &sessions[i];
1.130 provos 1899: if (s->used) {
1900: if (closefunc != NULL)
1901: closefunc(s);
1902: else
1903: session_close(s);
1904: }
1.2 markus 1905: }
1.9 markus 1906: }
1907:
1.94 itojun 1908: static char *
1.9 markus 1909: session_tty_list(void)
1910: {
1911: static char buf[1024];
1912: int i;
1913: buf[0] = '\0';
1.112 deraadt 1914: for (i = 0; i < MAX_SESSIONS; i++) {
1.9 markus 1915: Session *s = &sessions[i];
1916: if (s->used && s->ttyfd != -1) {
1917: if (buf[0] != '\0')
1918: strlcat(buf, ",", sizeof buf);
1919: strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
1920: }
1921: }
1922: if (buf[0] == '\0')
1923: strlcpy(buf, "notty", sizeof buf);
1924: return buf;
1925: }
1926:
1927: void
1928: session_proctitle(Session *s)
1929: {
1930: if (s->pw == NULL)
1931: error("no user for session %d", s->self);
1932: else
1933: setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1.81 markus 1934: }
1935:
1936: int
1937: session_setup_x11fwd(Session *s)
1938: {
1939: struct stat st;
1.109 stevesk 1940: char display[512], auth_display[512];
1941: char hostname[MAXHOSTNAMELEN];
1.184 djm 1942: u_int i;
1.81 markus 1943:
1944: if (no_x11_forwarding_flag) {
1945: packet_send_debug("X11 forwarding disabled in user configuration file.");
1946: return 0;
1947: }
1948: if (!options.x11_forwarding) {
1949: debug("X11 forwarding disabled in server configuration file.");
1950: return 0;
1951: }
1952: if (!options.xauth_location ||
1953: (stat(options.xauth_location, &st) == -1)) {
1954: packet_send_debug("No xauth program; cannot forward with spoofing.");
1.91 markus 1955: return 0;
1956: }
1957: if (options.use_login) {
1958: packet_send_debug("X11 forwarding disabled; "
1959: "not compatible with UseLogin=yes.");
1.81 markus 1960: return 0;
1961: }
1.87 markus 1962: if (s->display != NULL) {
1.81 markus 1963: debug("X11 display already set.");
1964: return 0;
1965: }
1.140 deraadt 1966: if (x11_create_display_inet(options.x11_display_offset,
1967: options.x11_use_localhost, s->single_connection,
1.184 djm 1968: &s->display_number, &s->x11_chanids) == -1) {
1.87 markus 1969: debug("x11_create_display_inet failed.");
1.81 markus 1970: return 0;
1.184 djm 1971: }
1972: for (i = 0; s->x11_chanids[i] != -1; i++) {
1973: channel_register_cleanup(s->x11_chanids[i],
1.187 djm 1974: session_close_single_x11, 0);
1.81 markus 1975: }
1.109 stevesk 1976:
1977: /* Set up a suitable value for the DISPLAY variable. */
1978: if (gethostname(hostname, sizeof(hostname)) < 0)
1979: fatal("gethostname: %.100s", strerror(errno));
1980: /*
1981: * auth_display must be used as the displayname when the
1982: * authorization entry is added with xauth(1). This will be
1983: * different than the DISPLAY string for localhost displays.
1984: */
1.119 stevesk 1985: if (options.x11_use_localhost) {
1.140 deraadt 1986: snprintf(display, sizeof display, "localhost:%u.%u",
1.109 stevesk 1987: s->display_number, s->screen);
1.140 deraadt 1988: snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
1.118 stevesk 1989: s->display_number, s->screen);
1.109 stevesk 1990: s->display = xstrdup(display);
1.118 stevesk 1991: s->auth_display = xstrdup(auth_display);
1.109 stevesk 1992: } else {
1.140 deraadt 1993: snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
1.109 stevesk 1994: s->display_number, s->screen);
1995: s->display = xstrdup(display);
1.118 stevesk 1996: s->auth_display = xstrdup(display);
1.109 stevesk 1997: }
1998:
1.81 markus 1999: return 1;
1.2 markus 2000: }
2001:
1.94 itojun 2002: static void
1.49 markus 2003: do_authenticated2(Authctxt *authctxt)
1.2 markus 2004: {
1.97 markus 2005: server_loop2(authctxt);
1.165 markus 2006: }
2007:
2008: void
2009: do_cleanup(Authctxt *authctxt)
2010: {
2011: static int called = 0;
2012:
2013: debug("do_cleanup");
2014:
2015: /* no cleanup if we're in the child for login shell */
2016: if (is_child)
2017: return;
2018:
2019: /* avoid double cleanup */
2020: if (called)
2021: return;
2022: called = 1;
2023:
1.197.2.1 brad 2024: if (authctxt == NULL || !authctxt->authenticated)
1.165 markus 2025: return;
2026: #ifdef KRB5
2027: if (options.kerberos_ticket_cleanup &&
2028: authctxt->krb5_ctx)
2029: krb5_cleanup_proc(authctxt);
1.161 markus 2030: #endif
1.165 markus 2031:
2032: #ifdef GSSAPI
2033: if (compat20 && options.gss_cleanup_creds)
2034: ssh_gssapi_cleanup_creds();
2035: #endif
2036:
2037: /* remove agent socket */
2038: auth_sock_cleanup_proc(authctxt->pw);
2039:
2040: /*
2041: * Cleanup ptys/utmp only if privsep is disabled,
2042: * or if running in monitor.
2043: */
2044: if (!use_privsep || mm_is_monitor())
2045: session_destroy_all(session_pty_cleanup2);
1.1 markus 2046: }
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