Annotation of src/usr.bin/ssh/session.c, Revision 1.334
1.334 ! dtucker 1: /* $OpenBSD: session.c,v 1.333 2023/01/06 02:42:34 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>
1.207 stevesk 40: #include <sys/socket.h>
1.236 djm 41: #include <sys/queue.h>
1.192 stevesk 42:
1.282 djm 43: #include <ctype.h>
1.209 stevesk 44: #include <errno.h>
1.253 djm 45: #include <fcntl.h>
1.204 stevesk 46: #include <grp.h>
1.223 djm 47: #include <login_cap.h>
1.272 djm 48: #include <netdb.h>
1.192 stevesk 49: #include <paths.h>
1.206 stevesk 50: #include <pwd.h>
1.195 stevesk 51: #include <signal.h>
1.215 stevesk 52: #include <stdio.h>
1.214 stevesk 53: #include <stdlib.h>
1.212 stevesk 54: #include <string.h>
1.317 deraadt 55: #include <stdarg.h>
1.211 stevesk 56: #include <unistd.h>
1.277 deraadt 57: #include <limits.h>
1.1 markus 58:
1.216 deraadt 59: #include "xmalloc.h"
1.51 markus 60: #include "ssh.h"
61: #include "ssh2.h"
1.59 djm 62: #include "sshpty.h"
1.1 markus 63: #include "packet.h"
1.303 markus 64: #include "sshbuf.h"
65: #include "ssherr.h"
1.173 djm 66: #include "match.h"
1.1 markus 67: #include "uidswap.h"
1.78 markus 68: #include "channels.h"
1.304 markus 69: #include "sshkey.h"
1.216 deraadt 70: #include "cipher.h"
71: #include "kex.h"
72: #include "hostfile.h"
1.2 markus 73: #include "auth.h"
1.19 markus 74: #include "auth-options.h"
1.266 markus 75: #include "authfd.h"
1.50 markus 76: #include "pathnames.h"
1.51 markus 77: #include "log.h"
1.274 millert 78: #include "misc.h"
1.51 markus 79: #include "servconf.h"
1.59 djm 80: #include "sshlogin.h"
1.51 markus 81: #include "serverloop.h"
82: #include "canohost.h"
1.55 itojun 83: #include "session.h"
1.216 deraadt 84: #ifdef GSSAPI
85: #include "ssh-gss.h"
86: #endif
1.130 provos 87: #include "monitor_wrap.h"
1.225 markus 88: #include "sftp.h"
1.290 djm 89: #include "atomicio.h"
1.171 markus 90:
91: #ifdef KRB5
92: #include <kafs.h>
1.161 markus 93: #endif
1.310 djm 94:
1.242 djm 95: #define IS_INTERNAL_SFTP(c) \
96: (!strncmp(c, INTERNAL_SFTP_NAME, sizeof(INTERNAL_SFTP_NAME) - 1) && \
97: (c[sizeof(INTERNAL_SFTP_NAME) - 1] == '\0' || \
98: c[sizeof(INTERNAL_SFTP_NAME) - 1] == ' ' || \
99: c[sizeof(INTERNAL_SFTP_NAME) - 1] == '\t'))
100:
1.1 markus 101: /* func */
102:
103: Session *session_new(void);
1.292 djm 104: void session_set_fds(struct ssh *, Session *, int, int, int, int, int);
1.165 markus 105: void session_pty_cleanup(Session *);
1.94 itojun 106: void session_proctitle(Session *);
1.292 djm 107: int session_setup_x11fwd(struct ssh *, Session *);
108: int do_exec_pty(struct ssh *, Session *, const char *);
109: int do_exec_no_pty(struct ssh *, Session *, const char *);
110: int do_exec(struct ssh *, Session *, const char *);
111: void do_login(struct ssh *, Session *, const char *);
112: void do_child(struct ssh *, Session *, const char *);
1.73 djm 113: void do_motd(void);
1.94 itojun 114: int check_quietlogin(Session *, const char *);
1.1 markus 115:
1.292 djm 116: static void do_authenticated2(struct ssh *, Authctxt *);
1.94 itojun 117:
1.292 djm 118: static int session_pty_req(struct ssh *, Session *);
1.65 markus 119:
1.1 markus 120: /* import */
121: extern ServerOptions options;
122: extern char *__progname;
123: extern int debug_flag;
1.45 markus 124: extern u_int utmp_len;
1.21 markus 125: extern int startup_pipe;
1.74 markus 126: extern void destroy_sensitive_data(void);
1.303 markus 127: extern struct sshbuf *loginmsg;
1.294 djm 128: extern struct sshauthopt *auth_opts;
1.309 djm 129: extern char *tun_fwd_ifnames; /* serverloop.c */
1.21 markus 130:
1.34 markus 131: /* original command from peer. */
1.92 markus 132: const char *original_command = NULL;
1.34 markus 133:
1.1 markus 134: /* data */
1.237 djm 135: static int sessions_first_unused = -1;
136: static int sessions_nalloc = 0;
137: static Session *sessions = NULL;
1.1 markus 138:
1.248 djm 139: #define SUBSYSTEM_NONE 0
140: #define SUBSYSTEM_EXT 1
141: #define SUBSYSTEM_INT_SFTP 2
142: #define SUBSYSTEM_INT_SFTP_ERROR 3
1.225 markus 143:
1.129 provos 144: login_cap_t *lc;
1.28 millert 145:
1.165 markus 146: static int is_child = 0;
1.279 djm 147: static int in_chroot = 0;
1.165 markus 148:
1.290 djm 149: /* File containing userauth info, if ExposeAuthInfo set */
150: static char *auth_info_file = NULL;
151:
1.136 markus 152: /* Name and directory of socket for authentication agent forwarding. */
153: static char *auth_sock_name = NULL;
154: static char *auth_sock_dir = NULL;
155:
156: /* removes the agent forwarding socket */
157:
158: static void
1.165 markus 159: auth_sock_cleanup_proc(struct passwd *pw)
1.136 markus 160: {
161: if (auth_sock_name != NULL) {
162: temporarily_use_uid(pw);
163: unlink(auth_sock_name);
164: rmdir(auth_sock_dir);
165: auth_sock_name = NULL;
166: restore_uid();
167: }
168: }
169:
170: static int
1.292 djm 171: auth_input_request_forwarding(struct ssh *ssh, struct passwd * pw)
1.136 markus 172: {
173: Channel *nc;
1.237 djm 174: int sock = -1;
1.136 markus 175:
176: if (auth_sock_name != NULL) {
177: error("authentication forwarding requested twice.");
178: return 0;
179: }
180:
181: /* Temporarily drop privileged uid for mkdir/bind. */
182: temporarily_use_uid(pw);
183:
184: /* Allocate a buffer for the socket name, and format the name. */
1.237 djm 185: auth_sock_dir = xstrdup("/tmp/ssh-XXXXXXXXXX");
1.136 markus 186:
187: /* Create private directory for socket */
188: if (mkdtemp(auth_sock_dir) == NULL) {
1.312 djm 189: ssh_packet_send_debug(ssh, "Agent forwarding disabled: "
1.136 markus 190: "mkdtemp() failed: %.100s", strerror(errno));
191: restore_uid();
1.265 djm 192: free(auth_sock_dir);
1.136 markus 193: auth_sock_dir = NULL;
1.237 djm 194: goto authsock_err;
1.136 markus 195: }
1.237 djm 196:
197: xasprintf(&auth_sock_name, "%s/agent.%ld",
198: auth_sock_dir, (long) getpid());
1.136 markus 199:
1.274 millert 200: /* Start a Unix listener on auth_sock_name. */
201: sock = unix_listener(auth_sock_name, SSH_LISTEN_BACKLOG, 0);
1.136 markus 202:
203: /* Restore the privileged uid. */
204: restore_uid();
205:
1.274 millert 206: /* Check for socket/bind/listen failure. */
207: if (sock < 0)
1.237 djm 208: goto authsock_err;
1.136 markus 209:
210: /* Allocate a channel for the authentication agent socket. */
1.332 djm 211: nc = channel_new(ssh, "auth-listener",
1.136 markus 212: SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
213: CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
1.156 markus 214: 0, "auth socket", 1);
1.245 djm 215: nc->path = xstrdup(auth_sock_name);
1.136 markus 216: return 1;
1.237 djm 217:
218: authsock_err:
1.265 djm 219: free(auth_sock_name);
1.237 djm 220: if (auth_sock_dir != NULL) {
1.315 djm 221: temporarily_use_uid(pw);
1.237 djm 222: rmdir(auth_sock_dir);
1.315 djm 223: restore_uid();
1.265 djm 224: free(auth_sock_dir);
1.237 djm 225: }
226: if (sock != -1)
227: close(sock);
228: auth_sock_name = NULL;
229: auth_sock_dir = NULL;
230: return 0;
1.136 markus 231: }
232:
1.179 dtucker 233: static void
234: display_loginmsg(void)
235: {
1.303 markus 236: int r;
237:
238: if (sshbuf_len(loginmsg) == 0)
239: return;
240: if ((r = sshbuf_put_u8(loginmsg, 0)) != 0)
1.325 djm 241: fatal_fr(r, "sshbuf_put_u8");
1.303 markus 242: printf("%s", (char *)sshbuf_ptr(loginmsg));
243: sshbuf_reset(loginmsg);
1.179 dtucker 244: }
1.136 markus 245:
1.290 djm 246: static void
247: prepare_auth_info_file(struct passwd *pw, struct sshbuf *info)
248: {
249: int fd = -1, success = 0;
250:
251: if (!options.expose_userauth_info || info == NULL)
252: return;
253:
254: temporarily_use_uid(pw);
255: auth_info_file = xstrdup("/tmp/sshauth.XXXXXXXXXXXXXXX");
256: if ((fd = mkstemp(auth_info_file)) == -1) {
1.325 djm 257: error_f("mkstemp: %s", strerror(errno));
1.290 djm 258: goto out;
259: }
260: if (atomicio(vwrite, fd, sshbuf_mutable_ptr(info),
261: sshbuf_len(info)) != sshbuf_len(info)) {
1.325 djm 262: error_f("write: %s", strerror(errno));
1.290 djm 263: goto out;
264: }
265: if (close(fd) != 0) {
1.325 djm 266: error_f("close: %s", strerror(errno));
1.290 djm 267: goto out;
268: }
269: success = 1;
270: out:
271: if (!success) {
272: if (fd != -1)
273: close(fd);
274: free(auth_info_file);
275: auth_info_file = NULL;
276: }
277: restore_uid();
278: }
279:
1.294 djm 280: static void
1.297 djm 281: set_fwdpermit_from_authopts(struct ssh *ssh, const struct sshauthopt *opts)
1.294 djm 282: {
283: char *tmp, *cp, *host;
284: int port;
285: size_t i;
286:
1.297 djm 287: if ((options.allow_tcp_forwarding & FORWARD_LOCAL) != 0) {
288: channel_clear_permission(ssh, FORWARD_USER, FORWARD_LOCAL);
289: for (i = 0; i < auth_opts->npermitopen; i++) {
290: tmp = cp = xstrdup(auth_opts->permitopen[i]);
291: /* This shouldn't fail as it has already been checked */
1.330 dtucker 292: if ((host = hpdelim2(&cp, NULL)) == NULL)
1.325 djm 293: fatal_f("internal error: hpdelim");
1.297 djm 294: host = cleanhostname(host);
295: if (cp == NULL || (port = permitopen_port(cp)) < 0)
1.325 djm 296: fatal_f("internal error: permitopen port");
1.297 djm 297: channel_add_permission(ssh,
298: FORWARD_USER, FORWARD_LOCAL, host, port);
299: free(tmp);
300: }
301: }
302: if ((options.allow_tcp_forwarding & FORWARD_REMOTE) != 0) {
303: channel_clear_permission(ssh, FORWARD_USER, FORWARD_REMOTE);
304: for (i = 0; i < auth_opts->npermitlisten; i++) {
305: tmp = cp = xstrdup(auth_opts->permitlisten[i]);
306: /* This shouldn't fail as it has already been checked */
307: if ((host = hpdelim(&cp)) == NULL)
1.325 djm 308: fatal_f("internal error: hpdelim");
1.297 djm 309: host = cleanhostname(host);
310: if (cp == NULL || (port = permitopen_port(cp)) < 0)
1.325 djm 311: fatal_f("internal error: permitlisten port");
1.297 djm 312: channel_add_permission(ssh,
313: FORWARD_USER, FORWARD_REMOTE, host, port);
314: free(tmp);
315: }
1.294 djm 316: }
317: }
318:
1.65 markus 319: void
1.292 djm 320: do_authenticated(struct ssh *ssh, Authctxt *authctxt)
1.65 markus 321: {
1.153 markus 322: setproctitle("%s", authctxt->pw->pw_name);
323:
1.294 djm 324: auth_log_authopts("active", auth_opts, 0);
325:
1.65 markus 326: /* setup the channel layer */
1.274 millert 327: /* XXX - streamlocal? */
1.297 djm 328: set_fwdpermit_from_authopts(ssh, auth_opts);
1.296 djm 329:
1.294 djm 330: if (!auth_opts->permit_port_forwarding_flag ||
1.296 djm 331: options.disable_forwarding) {
332: channel_disable_admin(ssh, FORWARD_LOCAL);
333: channel_disable_admin(ssh, FORWARD_REMOTE);
334: } else {
335: if ((options.allow_tcp_forwarding & FORWARD_LOCAL) == 0)
336: channel_disable_admin(ssh, FORWARD_LOCAL);
337: else
338: channel_permit_all(ssh, FORWARD_LOCAL);
339: if ((options.allow_tcp_forwarding & FORWARD_REMOTE) == 0)
340: channel_disable_admin(ssh, FORWARD_REMOTE);
341: else
342: channel_permit_all(ssh, FORWARD_REMOTE);
343: }
1.311 djm 344: auth_debug_send(ssh);
1.65 markus 345:
1.290 djm 346: prepare_auth_info_file(authctxt->pw, authctxt->session_info);
347:
1.292 djm 348: do_authenticated2(ssh, authctxt);
1.290 djm 349:
1.292 djm 350: do_cleanup(ssh, authctxt);
1.65 markus 351: }
352:
1.282 djm 353: /* Check untrusted xauth strings for metacharacters */
354: static int
355: xauth_valid_string(const char *s)
356: {
357: size_t i;
358:
359: for (i = 0; s[i] != '\0'; i++) {
360: if (!isalnum((u_char)s[i]) &&
361: s[i] != '.' && s[i] != ':' && s[i] != '/' &&
362: s[i] != '-' && s[i] != '_')
1.305 deraadt 363: return 0;
1.282 djm 364: }
365: return 1;
366: }
367:
1.269 dtucker 368: #define USE_PIPES 1
1.1 markus 369: /*
370: * This is called to fork and execute a command when we have no tty. This
371: * will call do_child from the child, and server_loop from the parent after
372: * setting up file descriptors and such.
373: */
1.237 djm 374: int
1.292 djm 375: do_exec_no_pty(struct ssh *ssh, Session *s, const char *command)
1.1 markus 376: {
1.137 mpech 377: pid_t pid;
1.238 markus 378: #ifdef USE_PIPES
379: int pin[2], pout[2], perr[2];
380:
1.253 djm 381: if (s == NULL)
382: fatal("do_exec_no_pty: no session");
383:
1.238 markus 384: /* Allocate pipes for communicating with the program. */
1.316 deraadt 385: if (pipe(pin) == -1) {
1.325 djm 386: error_f("pipe in: %.100s", strerror(errno));
1.238 markus 387: return -1;
388: }
1.316 deraadt 389: if (pipe(pout) == -1) {
1.325 djm 390: error_f("pipe out: %.100s", strerror(errno));
1.238 markus 391: close(pin[0]);
392: close(pin[1]);
393: return -1;
394: }
1.316 deraadt 395: if (pipe(perr) == -1) {
1.325 djm 396: error_f("pipe err: %.100s", strerror(errno));
1.256 djm 397: close(pin[0]);
398: close(pin[1]);
399: close(pout[0]);
400: close(pout[1]);
401: return -1;
1.238 markus 402: }
403: #else
1.237 djm 404: int inout[2], err[2];
1.1 markus 405:
1.253 djm 406: if (s == NULL)
407: fatal("do_exec_no_pty: no session");
408:
1.1 markus 409: /* Uses socket pairs to communicate with the program. */
1.316 deraadt 410: if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) == -1) {
1.325 djm 411: error_f("socketpair #1: %.100s", strerror(errno));
1.237 djm 412: return -1;
413: }
1.316 deraadt 414: if (socketpair(AF_UNIX, SOCK_STREAM, 0, err) == -1) {
1.325 djm 415: error_f("socketpair #2: %.100s", strerror(errno));
1.256 djm 416: close(inout[0]);
417: close(inout[1]);
418: return -1;
1.237 djm 419: }
1.238 markus 420: #endif
1.237 djm 421:
1.9 markus 422: session_proctitle(s);
1.1 markus 423:
424: /* Fork the child. */
1.237 djm 425: switch ((pid = fork())) {
426: case -1:
1.325 djm 427: error_f("fork: %.100s", strerror(errno));
1.238 markus 428: #ifdef USE_PIPES
429: close(pin[0]);
430: close(pin[1]);
431: close(pout[0]);
432: close(pout[1]);
1.256 djm 433: close(perr[0]);
1.238 markus 434: close(perr[1]);
435: #else
1.237 djm 436: close(inout[0]);
437: close(inout[1]);
438: close(err[0]);
1.256 djm 439: close(err[1]);
1.238 markus 440: #endif
1.237 djm 441: return -1;
442: case 0:
1.165 markus 443: is_child = 1;
1.144 markus 444:
1.1 markus 445: /*
446: * Create a new session and process group since the 4.4BSD
447: * setlogin() affects the entire process group.
448: */
1.316 deraadt 449: if (setsid() == -1)
1.1 markus 450: error("setsid failed: %.100s", strerror(errno));
451:
1.238 markus 452: #ifdef USE_PIPES
453: /*
454: * Redirect stdin. We close the parent side of the socket
455: * pair, and make the child side the standard input.
456: */
457: close(pin[1]);
1.316 deraadt 458: if (dup2(pin[0], 0) == -1)
1.238 markus 459: perror("dup2 stdin");
460: close(pin[0]);
461:
462: /* Redirect stdout. */
463: close(pout[0]);
1.316 deraadt 464: if (dup2(pout[1], 1) == -1)
1.238 markus 465: perror("dup2 stdout");
466: close(pout[1]);
467:
468: /* Redirect stderr. */
1.256 djm 469: close(perr[0]);
1.316 deraadt 470: if (dup2(perr[1], 2) == -1)
1.238 markus 471: perror("dup2 stderr");
472: close(perr[1]);
473: #else
1.1 markus 474: /*
475: * Redirect stdin, stdout, and stderr. Stdin and stdout will
476: * use the same socket, as some programs (particularly rdist)
477: * seem to depend on it.
478: */
479: close(inout[1]);
1.256 djm 480: close(err[1]);
1.316 deraadt 481: if (dup2(inout[0], 0) == -1) /* stdin */
1.1 markus 482: perror("dup2 stdin");
1.316 deraadt 483: if (dup2(inout[0], 1) == -1) /* stdout (same as stdin) */
1.1 markus 484: perror("dup2 stdout");
1.238 markus 485: close(inout[0]);
1.316 deraadt 486: if (dup2(err[0], 2) == -1) /* stderr */
1.1 markus 487: perror("dup2 stderr");
1.238 markus 488: close(err[0]);
489: #endif
1.1 markus 490:
491: /* Do processing for the child (exec command etc). */
1.292 djm 492: do_child(ssh, s, command);
1.1 markus 493: /* NOTREACHED */
1.237 djm 494: default:
495: break;
1.1 markus 496: }
1.237 djm 497:
1.1 markus 498: s->pid = pid;
1.47 markus 499: /* Set interactive/non-interactive mode. */
1.312 djm 500: ssh_packet_set_interactive(ssh, s->display != NULL,
1.257 djm 501: options.ip_qos_interactive, options.ip_qos_bulk);
1.1 markus 502:
1.238 markus 503: #ifdef USE_PIPES
504: /* We are the parent. Close the child sides of the pipes. */
505: close(pin[0]);
506: close(pout[1]);
507: close(perr[1]);
508:
1.292 djm 509: session_set_fds(ssh, s, pin[1], pout[0], perr[0],
1.283 markus 510: s->is_subsystem, 0);
1.238 markus 511: #else
1.1 markus 512: /* We are the parent. Close the child sides of the socket pairs. */
513: close(inout[0]);
514: close(err[0]);
515:
516: /*
517: * Enter the interactive session. Note: server_loop must be able to
518: * handle the case that fdin and fdout are the same.
519: */
1.313 dtucker 520: session_set_fds(ssh, s, inout[1], inout[1], err[1],
1.283 markus 521: s->is_subsystem, 0);
1.238 markus 522: #endif
1.237 djm 523: return 0;
1.1 markus 524: }
525:
526: /*
527: * This is called to fork and execute a command when we have a tty. This
528: * will call do_child from the child, and server_loop from the parent after
529: * setting up file descriptors, controlling tty, updating wtmp, utmp,
530: * lastlog, and other such operations.
531: */
1.237 djm 532: int
1.292 djm 533: do_exec_pty(struct ssh *ssh, Session *s, const char *command)
1.1 markus 534: {
535: int fdout, ptyfd, ttyfd, ptymaster;
536: pid_t pid;
537:
538: if (s == NULL)
539: fatal("do_exec_pty: no session");
540: ptyfd = s->ptyfd;
541: ttyfd = s->ttyfd;
542:
1.237 djm 543: /*
544: * Create another descriptor of the pty master side for use as the
545: * standard input. We could use the original descriptor, but this
546: * simplifies code in server_loop. The descriptor is bidirectional.
547: * Do this before forking (and cleanup in the child) so as to
548: * detect and gracefully fail out-of-fd conditions.
549: */
1.316 deraadt 550: if ((fdout = dup(ptyfd)) == -1) {
1.325 djm 551: error_f("dup #1: %s", strerror(errno));
1.237 djm 552: close(ttyfd);
553: close(ptyfd);
554: return -1;
555: }
556: /* we keep a reference to the pty master */
1.316 deraadt 557: if ((ptymaster = dup(ptyfd)) == -1) {
1.325 djm 558: error_f("dup #2: %s", strerror(errno));
1.237 djm 559: close(ttyfd);
560: close(ptyfd);
561: close(fdout);
562: return -1;
563: }
564:
1.1 markus 565: /* Fork the child. */
1.237 djm 566: switch ((pid = fork())) {
567: case -1:
1.325 djm 568: error_f("fork: %.100s", strerror(errno));
1.237 djm 569: close(fdout);
570: close(ptymaster);
571: close(ttyfd);
572: close(ptyfd);
573: return -1;
574: case 0:
1.165 markus 575: is_child = 1;
1.97 markus 576:
1.237 djm 577: close(fdout);
578: close(ptymaster);
579:
1.1 markus 580: /* Close the master side of the pseudo tty. */
581: close(ptyfd);
582:
583: /* Make the pseudo tty our controlling tty. */
584: pty_make_controlling_tty(&ttyfd, s->tty);
585:
1.103 markus 586: /* Redirect stdin/stdout/stderr from the pseudo tty. */
1.316 deraadt 587: if (dup2(ttyfd, 0) == -1)
1.103 markus 588: error("dup2 stdin: %s", strerror(errno));
1.316 deraadt 589: if (dup2(ttyfd, 1) == -1)
1.103 markus 590: error("dup2 stdout: %s", strerror(errno));
1.316 deraadt 591: if (dup2(ttyfd, 2) == -1)
1.103 markus 592: error("dup2 stderr: %s", strerror(errno));
1.1 markus 593:
594: /* Close the extra descriptor for the pseudo tty. */
595: close(ttyfd);
596:
1.24 markus 597: /* record login, etc. similar to login(1) */
1.292 djm 598: do_login(ssh, s, command);
1.228 djm 599:
1.237 djm 600: /*
601: * Do common processing for the child, such as execing
602: * the command.
603: */
1.292 djm 604: do_child(ssh, s, command);
1.1 markus 605: /* NOTREACHED */
1.237 djm 606: default:
607: break;
1.1 markus 608: }
609: s->pid = pid;
610:
1.324 deraadt 611: /* Parent. Close the slave side of the pseudo tty. */
1.1 markus 612: close(ttyfd);
613:
1.237 djm 614: /* Enter interactive session. */
1.1 markus 615: s->ptymaster = ptymaster;
1.312 djm 616: ssh_packet_set_interactive(ssh, 1,
1.257 djm 617: options.ip_qos_interactive, options.ip_qos_bulk);
1.292 djm 618: session_set_fds(ssh, s, ptyfd, fdout, -1, 1, 1);
1.237 djm 619: return 0;
1.24 markus 620: }
621:
1.90 markus 622: /*
623: * This is called to fork and execute a command. If another command is
624: * to be forced, execute that instead.
625: */
1.237 djm 626: int
1.292 djm 627: do_exec(struct ssh *ssh, Session *s, const char *command)
1.90 markus 628: {
1.237 djm 629: int ret;
1.280 djm 630: const char *forced = NULL, *tty = NULL;
631: char session_type[1024];
1.237 djm 632:
1.210 dtucker 633: if (options.adm_forced_command) {
634: original_command = command;
635: command = options.adm_forced_command;
1.267 djm 636: forced = "(config)";
1.294 djm 637: } else if (auth_opts->force_command != NULL) {
1.90 markus 638: original_command = command;
1.294 djm 639: command = auth_opts->force_command;
1.267 djm 640: forced = "(key-option)";
641: }
1.306 djm 642: s->forced = 0;
1.267 djm 643: if (forced != NULL) {
1.306 djm 644: s->forced = 1;
1.248 djm 645: if (IS_INTERNAL_SFTP(command)) {
646: s->is_subsystem = s->is_subsystem ?
647: SUBSYSTEM_INT_SFTP : SUBSYSTEM_INT_SFTP_ERROR;
648: } else if (s->is_subsystem)
1.225 markus 649: s->is_subsystem = SUBSYSTEM_EXT;
1.267 djm 650: snprintf(session_type, sizeof(session_type),
651: "forced-command %s '%.900s'", forced, command);
652: } else if (s->is_subsystem) {
653: snprintf(session_type, sizeof(session_type),
654: "subsystem '%.900s'", s->subsys);
655: } else if (command == NULL) {
656: snprintf(session_type, sizeof(session_type), "shell");
657: } else {
658: /* NB. we don't log unforced commands to preserve privacy */
659: snprintf(session_type, sizeof(session_type), "command");
1.90 markus 660: }
1.163 markus 661:
1.267 djm 662: if (s->ttyfd != -1) {
663: tty = s->tty;
664: if (strncmp(tty, "/dev/", 5) == 0)
665: tty += 5;
666: }
667:
1.280 djm 668: verbose("Starting session: %s%s%s for %s from %.200s port %d id %d",
1.267 djm 669: session_type,
670: tty == NULL ? "" : " on ",
671: tty == NULL ? "" : tty,
672: s->pw->pw_name,
1.281 djm 673: ssh_remote_ipaddr(ssh),
674: ssh_remote_port(ssh),
1.280 djm 675: s->self);
1.267 djm 676:
1.163 markus 677: #ifdef GSSAPI
678: if (options.gss_authentication) {
679: temporarily_use_uid(s->pw);
680: ssh_gssapi_storecreds();
681: restore_uid();
682: }
683: #endif
1.90 markus 684: if (s->ttyfd != -1)
1.292 djm 685: ret = do_exec_pty(ssh, s, command);
1.90 markus 686: else
1.292 djm 687: ret = do_exec_no_pty(ssh, s, command);
1.90 markus 688:
1.92 markus 689: original_command = NULL;
1.179 dtucker 690:
691: /*
692: * Clear loginmsg: it's the child's responsibility to display
693: * it to the user, otherwise multiple sessions may accumulate
694: * multiple copies of the login messages.
695: */
1.303 markus 696: sshbuf_reset(loginmsg);
1.237 djm 697:
698: return ret;
1.90 markus 699: }
700:
701:
1.24 markus 702: /* administrative, login(1)-like work */
703: void
1.292 djm 704: do_login(struct ssh *ssh, Session *s, const char *command)
1.24 markus 705: {
706: socklen_t fromlen;
707: struct sockaddr_storage from;
708: struct passwd * pw = s->pw;
709: pid_t pid = getpid();
710:
711: /*
712: * Get IP address of client. If the connection is not a socket, let
713: * the address be 0.0.0.0.
714: */
715: memset(&from, 0, sizeof(from));
1.148 stevesk 716: fromlen = sizeof(from);
1.312 djm 717: if (ssh_packet_connection_is_on_socket(ssh)) {
718: if (getpeername(ssh_packet_get_connection_in(ssh),
1.316 deraadt 719: (struct sockaddr *)&from, &fromlen) == -1) {
1.24 markus 720: debug("getpeername: %.100s", strerror(errno));
1.165 markus 721: cleanup_exit(255);
1.24 markus 722: }
723: }
1.25 markus 724:
1.24 markus 725: /* Record that there was a login on that tty from the remote host. */
1.133 markus 726: if (!use_privsep)
727: record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
1.281 djm 728: session_get_remote_name_or_ip(ssh, utmp_len,
1.158 markus 729: options.use_dns),
1.148 stevesk 730: (struct sockaddr *)&from, fromlen);
1.24 markus 731:
1.73 djm 732: if (check_quietlogin(s, command))
1.24 markus 733: return;
1.73 djm 734:
1.179 dtucker 735: display_loginmsg();
1.73 djm 736:
737: do_motd();
738: }
739:
740: /*
741: * Display the message of the day.
742: */
743: void
744: do_motd(void)
745: {
746: FILE *f;
747: char buf[256];
748:
1.24 markus 749: if (options.print_motd) {
1.28 millert 750: f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
751: "/etc/motd"), "r");
1.24 markus 752: if (f) {
753: while (fgets(buf, sizeof(buf), f))
754: fputs(buf, stdout);
755: fclose(f);
756: }
1.2 markus 757: }
1.73 djm 758: }
759:
760:
761: /*
762: * Check for quiet login, either .hushlogin or command given.
763: */
764: int
765: check_quietlogin(Session *s, const char *command)
766: {
767: char buf[256];
1.96 dugsong 768: struct passwd *pw = s->pw;
1.73 djm 769: struct stat st;
770:
771: /* Return 1 if .hushlogin exists or a command given. */
772: if (command != NULL)
773: return 1;
774: snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
775: if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
776: return 1;
777: return 0;
1.1 markus 778: }
779:
780: /*
781: * Reads environment variables from the given file and adds/overrides them
782: * into the environment. If the file does not exist, this does nothing.
783: * Otherwise, it must consist of empty lines, comments (line starts with '#')
784: * and assignments of the form name=value. No other forms are allowed.
1.323 djm 785: * If allowlist is not NULL, then it is interpreted as a pattern list and
1.301 djm 786: * only variable names that match it will be accepted.
1.1 markus 787: */
1.94 itojun 788: static void
1.45 markus 789: read_environment_file(char ***env, u_int *envsize,
1.323 djm 790: const char *filename, const char *allowlist)
1.1 markus 791: {
792: FILE *f;
1.298 markus 793: char *line = NULL, *cp, *value;
794: size_t linesize = 0;
1.142 deraadt 795: u_int lineno = 0;
1.1 markus 796:
797: f = fopen(filename, "r");
798: if (!f)
799: return;
800:
1.298 markus 801: while (getline(&line, &linesize, f) != -1) {
1.142 deraadt 802: if (++lineno > 1000)
803: fatal("Too many lines in environment file %s", filename);
1.298 markus 804: for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
1.1 markus 805: ;
806: if (!*cp || *cp == '#' || *cp == '\n')
807: continue;
1.224 gilles 808:
809: cp[strcspn(cp, "\n")] = '\0';
810:
1.1 markus 811: value = strchr(cp, '=');
812: if (value == NULL) {
1.142 deraadt 813: fprintf(stderr, "Bad line %u in %.100s\n", lineno,
814: filename);
1.1 markus 815: continue;
816: }
1.14 deraadt 817: /*
818: * Replace the equals sign by nul, and advance value to
819: * the value string.
820: */
1.1 markus 821: *value = '\0';
822: value++;
1.323 djm 823: if (allowlist != NULL &&
824: match_pattern_list(cp, allowlist, 0) != 1)
1.301 djm 825: continue;
1.1 markus 826: child_set_env(env, envsize, cp, value);
827: }
1.298 markus 828: free(line);
1.1 markus 829: fclose(f);
830: }
831:
1.127 markus 832: static char **
1.292 djm 833: do_setup_env(struct ssh *ssh, Session *s, const char *shell)
1.1 markus 834: {
835: char buf[256];
1.294 djm 836: size_t n;
1.127 markus 837: u_int i, envsize;
1.300 djm 838: char *ocp, *cp, *value, **env, *laddr;
1.127 markus 839: struct passwd *pw = s->pw;
1.1 markus 840:
841: /* Initialize the environment. */
842: envsize = 100;
1.220 djm 843: env = xcalloc(envsize, sizeof(char *));
1.1 markus 844: env[0] = NULL;
845:
1.161 markus 846: #ifdef GSSAPI
1.168 djm 847: /* Allow any GSSAPI methods that we've used to alter
1.319 djm 848: * the child's environment as they see fit
1.161 markus 849: */
850: ssh_gssapi_do_child(&env, &envsize);
851: #endif
852:
1.284 djm 853: /* Set basic environment. */
854: for (i = 0; i < s->num_env; i++)
855: child_set_env(&env, &envsize, s->env[i].name, s->env[i].val);
856:
857: child_set_env(&env, &envsize, "USER", pw->pw_name);
858: child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
859: child_set_env(&env, &envsize, "HOME", pw->pw_dir);
860: if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
861: child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
862: else
863: child_set_env(&env, &envsize, "PATH", getenv("PATH"));
864:
865: snprintf(buf, sizeof buf, "%.200s/%.50s", _PATH_MAILDIR, pw->pw_name);
866: child_set_env(&env, &envsize, "MAIL", buf);
867:
868: /* Normal systems set SHELL by default. */
869: child_set_env(&env, &envsize, "SHELL", shell);
1.1 markus 870:
871: if (getenv("TZ"))
872: child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1.299 djm 873: if (s->term)
874: child_set_env(&env, &envsize, "TERM", s->term);
875: if (s->display)
876: child_set_env(&env, &envsize, "DISPLAY", s->display);
877: #ifdef KRB5
878: if (s->authctxt->krb5_ticket_file)
879: child_set_env(&env, &envsize, "KRB5CCNAME",
880: s->authctxt->krb5_ticket_file);
881: #endif
882: if (auth_sock_name != NULL)
883: child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
884: auth_sock_name);
885:
1.1 markus 886:
1.294 djm 887: /* Set custom environment options from pubkey authentication. */
888: if (options.permit_user_env) {
889: for (n = 0 ; n < auth_opts->nenv; n++) {
890: ocp = xstrdup(auth_opts->env[n]);
891: cp = strchr(ocp, '=');
1.326 djm 892: if (cp != NULL) {
1.294 djm 893: *cp = '\0';
1.323 djm 894: /* Apply PermitUserEnvironment allowlist */
895: if (options.permit_user_env_allowlist == NULL ||
1.301 djm 896: match_pattern_list(ocp,
1.323 djm 897: options.permit_user_env_allowlist, 0) == 1)
1.301 djm 898: child_set_env(&env, &envsize,
899: ocp, cp + 1);
1.294 djm 900: }
901: free(ocp);
902: }
1.1 markus 903: }
904:
1.299 djm 905: /* read $HOME/.ssh/environment. */
906: if (options.permit_user_env) {
1.327 djm 907: snprintf(buf, sizeof buf, "%.200s/%s/environment",
908: pw->pw_dir, _PATH_SSH_USER_DIR);
1.301 djm 909: read_environment_file(&env, &envsize, buf,
1.323 djm 910: options.permit_user_env_allowlist);
1.300 djm 911: }
912:
913: /* Environment specified by admin */
914: for (i = 0; i < options.num_setenv; i++) {
915: cp = xstrdup(options.setenv[i]);
916: if ((value = strchr(cp, '=')) == NULL) {
917: /* shouldn't happen; vars are checked in servconf.c */
918: fatal("Invalid config SetEnv: %s", options.setenv[i]);
919: }
920: *value++ = '\0';
921: child_set_env(&env, &envsize, cp, value);
1.299 djm 922: }
923:
1.149 stevesk 924: /* SSH_CLIENT deprecated */
1.1 markus 925: snprintf(buf, sizeof buf, "%.50s %d %d",
1.281 djm 926: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh),
927: ssh_local_port(ssh));
1.1 markus 928: child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1.149 stevesk 929:
1.312 djm 930: laddr = get_local_ipaddr(ssh_packet_get_connection_in(ssh));
1.149 stevesk 931: snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
1.281 djm 932: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh),
933: laddr, ssh_local_port(ssh));
1.265 djm 934: free(laddr);
1.149 stevesk 935: child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
1.1 markus 936:
1.293 djm 937: if (tun_fwd_ifnames != NULL)
938: child_set_env(&env, &envsize, "SSH_TUNNEL", tun_fwd_ifnames);
1.290 djm 939: if (auth_info_file != NULL)
940: child_set_env(&env, &envsize, "SSH_USER_AUTH", auth_info_file);
1.60 markus 941: if (s->ttyfd != -1)
942: child_set_env(&env, &envsize, "SSH_TTY", s->tty);
1.34 markus 943: if (original_command)
944: child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
945: original_command);
1.1 markus 946:
947: if (debug_flag) {
948: /* dump the environment */
949: fprintf(stderr, "Environment:\n");
950: for (i = 0; env[i]; i++)
951: fprintf(stderr, " %.200s\n", env[i]);
952: }
1.127 markus 953: return env;
954: }
955:
956: /*
957: * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
958: * first in this order).
959: */
960: static void
1.294 djm 961: do_rc_files(struct ssh *ssh, Session *s, const char *shell)
1.127 markus 962: {
963: FILE *f = NULL;
1.320 dtucker 964: char *cmd = NULL, *user_rc = NULL;
1.127 markus 965: int do_xauth;
966: struct stat st;
967:
968: do_xauth =
969: s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
1.322 djm 970: xasprintf(&user_rc, "%s/%s", s->pw->pw_dir, _PATH_SSH_USER_RC);
1.127 markus 971:
1.231 djm 972: /* ignore _PATH_SSH_USER_RC for subsystems and admin forced commands */
1.232 djm 973: if (!s->is_subsystem && options.adm_forced_command == NULL &&
1.294 djm 974: auth_opts->permit_user_rc && options.permit_user_rc &&
1.320 dtucker 975: stat(user_rc, &st) >= 0) {
976: if (xasprintf(&cmd, "%s -c '%s %s'", shell, _PATH_BSHELL,
977: user_rc) == -1)
1.325 djm 978: fatal_f("xasprintf: %s", strerror(errno));
1.127 markus 979: if (debug_flag)
980: fprintf(stderr, "Running %s\n", cmd);
981: f = popen(cmd, "w");
982: if (f) {
983: if (do_xauth)
984: fprintf(f, "%s %s\n", s->auth_proto,
985: s->auth_data);
986: pclose(f);
987: } else
988: fprintf(stderr, "Could not run %s\n",
1.320 dtucker 989: user_rc);
1.127 markus 990: } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
991: if (debug_flag)
992: fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
993: _PATH_SSH_SYSTEM_RC);
994: f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
995: if (f) {
996: if (do_xauth)
997: fprintf(f, "%s %s\n", s->auth_proto,
998: s->auth_data);
999: pclose(f);
1000: } else
1001: fprintf(stderr, "Could not run %s\n",
1002: _PATH_SSH_SYSTEM_RC);
1003: } else if (do_xauth && options.xauth_location != NULL) {
1004: /* Add authority data to .Xauthority if appropriate. */
1005: if (debug_flag) {
1006: fprintf(stderr,
1.151 stevesk 1007: "Running %.500s remove %.100s\n",
1.165 markus 1008: options.xauth_location, s->auth_display);
1.151 stevesk 1009: fprintf(stderr,
1010: "%.500s add %.100s %.100s %.100s\n",
1.127 markus 1011: options.xauth_location, s->auth_display,
1012: s->auth_proto, s->auth_data);
1013: }
1.320 dtucker 1014: if (xasprintf(&cmd, "%s -q -", options.xauth_location) == -1)
1.325 djm 1015: fatal_f("xasprintf: %s", strerror(errno));
1.127 markus 1016: f = popen(cmd, "w");
1017: if (f) {
1.151 stevesk 1018: fprintf(f, "remove %s\n",
1019: s->auth_display);
1.127 markus 1020: fprintf(f, "add %s %s %s\n",
1021: s->auth_display, s->auth_proto,
1022: s->auth_data);
1023: pclose(f);
1024: } else {
1025: fprintf(stderr, "Could not run %s\n",
1026: cmd);
1027: }
1028: }
1.320 dtucker 1029: free(cmd);
1030: free(user_rc);
1.127 markus 1031: }
1032:
1033: static void
1034: do_nologin(struct passwd *pw)
1035: {
1036: FILE *f = NULL;
1.251 dtucker 1037: char buf[1024], *nl, *def_nl = _PATH_NOLOGIN;
1038: struct stat sb;
1.127 markus 1039:
1.260 guenther 1040: if (login_getcapbool(lc, "ignorenologin", 0) || pw->pw_uid == 0)
1.251 dtucker 1041: return;
1042: nl = login_getcapstr(lc, "nologin", def_nl, def_nl);
1043:
1044: if (stat(nl, &sb) == -1) {
1045: if (nl != def_nl)
1.265 djm 1046: free(nl);
1.251 dtucker 1047: return;
1048: }
1049:
1050: /* /etc/nologin exists. Print its contents if we can and exit. */
1051: logit("User %.100s not allowed because %s exists", pw->pw_name, nl);
1052: if ((f = fopen(nl, "r")) != NULL) {
1.127 markus 1053: while (fgets(buf, sizeof(buf), f))
1054: fputs(buf, stderr);
1055: fclose(f);
1056: }
1.251 dtucker 1057: exit(254);
1.127 markus 1058: }
1059:
1.226 djm 1060: /*
1061: * Chroot into a directory after checking it for safety: all path components
1062: * must be root-owned directories with strict permissions.
1063: */
1064: static void
1065: safely_chroot(const char *path, uid_t uid)
1066: {
1067: const char *cp;
1.277 deraadt 1068: char component[PATH_MAX];
1.226 djm 1069: struct stat st;
1070:
1.308 djm 1071: if (!path_absolute(path))
1.226 djm 1072: fatal("chroot path does not begin at root");
1073: if (strlen(path) >= sizeof(component))
1074: fatal("chroot path too long");
1075:
1076: /*
1077: * Descend the path, checking that each component is a
1078: * root-owned directory with strict permissions.
1079: */
1080: for (cp = path; cp != NULL;) {
1081: if ((cp = strchr(cp, '/')) == NULL)
1082: strlcpy(component, path, sizeof(component));
1083: else {
1084: cp++;
1085: memcpy(component, path, cp - path);
1086: component[cp - path] = '\0';
1087: }
1088:
1.325 djm 1089: debug3_f("checking '%s'", component);
1.226 djm 1090:
1091: if (stat(component, &st) != 0)
1.325 djm 1092: fatal_f("stat(\"%s\"): %s",
1.226 djm 1093: component, strerror(errno));
1094: if (st.st_uid != 0 || (st.st_mode & 022) != 0)
1095: fatal("bad ownership or modes for chroot "
1.312 djm 1096: "directory %s\"%s\"",
1.226 djm 1097: cp == NULL ? "" : "component ", component);
1098: if (!S_ISDIR(st.st_mode))
1099: fatal("chroot path %s\"%s\" is not a directory",
1100: cp == NULL ? "" : "component ", component);
1101:
1102: }
1103:
1104: if (chdir(path) == -1)
1105: fatal("Unable to chdir to chroot path \"%s\": "
1106: "%s", path, strerror(errno));
1107: if (chroot(path) == -1)
1108: fatal("chroot(\"%s\"): %s", path, strerror(errno));
1109: if (chdir("/") == -1)
1.325 djm 1110: fatal_f("chdir(/) after chroot: %s", strerror(errno));
1.226 djm 1111: verbose("Changed root directory to \"%s\"", path);
1112: }
1113:
1.127 markus 1114: /* Set login name, uid, gid, and groups. */
1.130 provos 1115: void
1.127 markus 1116: do_setusercontext(struct passwd *pw)
1117: {
1.295 djm 1118: char uidstr[32], *chroot_path, *tmp;
1.227 djm 1119:
1.127 markus 1120: if (getuid() == 0 || geteuid() == 0) {
1.226 djm 1121: /* Prepare groups */
1.127 markus 1122: if (setusercontext(lc, pw, pw->pw_uid,
1.226 djm 1123: (LOGIN_SETALL & ~(LOGIN_SETPATH|LOGIN_SETUSER))) < 0) {
1.127 markus 1124: perror("unable to set user context");
1125: exit(1);
1126: }
1.226 djm 1127:
1.279 djm 1128: if (!in_chroot && options.chroot_directory != NULL &&
1.226 djm 1129: strcasecmp(options.chroot_directory, "none") != 0) {
1.328 djm 1130: tmp = tilde_expand_filename(options.chroot_directory,
1.227 djm 1131: pw->pw_uid);
1.295 djm 1132: snprintf(uidstr, sizeof(uidstr), "%llu",
1133: (unsigned long long)pw->pw_uid);
1.227 djm 1134: chroot_path = percent_expand(tmp, "h", pw->pw_dir,
1.295 djm 1135: "u", pw->pw_name, "U", uidstr, (char *)NULL);
1.226 djm 1136: safely_chroot(chroot_path, pw->pw_uid);
1.227 djm 1137: free(tmp);
1.226 djm 1138: free(chroot_path);
1.264 djm 1139: /* Make sure we don't attempt to chroot again */
1140: free(options.chroot_directory);
1141: options.chroot_directory = NULL;
1.279 djm 1142: in_chroot = 1;
1.226 djm 1143: }
1144:
1145: /* Set UID */
1146: if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETUSER) < 0) {
1147: perror("unable to set user context (setuser)");
1148: exit(1);
1149: }
1.264 djm 1150: } else if (options.chroot_directory != NULL &&
1151: strcasecmp(options.chroot_directory, "none") != 0) {
1152: fatal("server lacks privileges to chroot to ChrootDirectory");
1.263 dtucker 1153: }
1.264 djm 1154:
1.127 markus 1155: if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1156: fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1157: }
1158:
1.131 markus 1159: static void
1.172 markus 1160: do_pwchange(Session *s)
1161: {
1.179 dtucker 1162: fflush(NULL);
1.172 markus 1163: fprintf(stderr, "WARNING: Your password has expired.\n");
1164: if (s->ttyfd != -1) {
1.178 deraadt 1165: fprintf(stderr,
1.172 markus 1166: "You must change your password now and login again!\n");
1167: execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL);
1168: perror("passwd");
1169: } else {
1170: fprintf(stderr,
1171: "Password change required but no TTY available.\n");
1172: }
1173: exit(1);
1174: }
1175:
1176: static void
1.292 djm 1177: child_close_fds(struct ssh *ssh)
1.172 markus 1178: {
1.276 djm 1179: extern int auth_sock;
1.266 markus 1180:
1.276 djm 1181: if (auth_sock != -1) {
1182: close(auth_sock);
1183: auth_sock = -1;
1.266 markus 1184: }
1185:
1.312 djm 1186: if (ssh_packet_get_connection_in(ssh) ==
1187: ssh_packet_get_connection_out(ssh))
1188: close(ssh_packet_get_connection_in(ssh));
1.172 markus 1189: else {
1.312 djm 1190: close(ssh_packet_get_connection_in(ssh));
1191: close(ssh_packet_get_connection_out(ssh));
1.172 markus 1192: }
1193: /*
1194: * Close all descriptors related to channels. They will still remain
1195: * open in the parent.
1196: */
1197: /* XXX better use close-on-exec? -markus */
1.292 djm 1198: channel_close_all(ssh);
1.172 markus 1199:
1200: /*
1201: * Close any extra file descriptors. Note that there may still be
1202: * descriptors left by system functions. They will be closed later.
1203: */
1204: endpwent();
1.321 djm 1205:
1206: /* Stop directing logs to a high-numbered fd before we close it */
1207: log_redirect_stderr_to(NULL);
1.172 markus 1208:
1209: /*
1.188 djm 1210: * Close any extra open file descriptors so that we don't have them
1.172 markus 1211: * hanging around in clients. Note that we want to do this after
1212: * initgroups, because at least on Solaris 2.3 it leaves file
1213: * descriptors open.
1214: */
1.258 djm 1215: closefrom(STDERR_FILENO + 1);
1.172 markus 1216: }
1217:
1.127 markus 1218: /*
1219: * Performs common processing for the child, such as setting up the
1220: * environment, closing extra file descriptors, setting the user and group
1221: * ids, and executing the command or shell.
1222: */
1.225 markus 1223: #define ARGV_MAX 10
1.127 markus 1224: void
1.292 djm 1225: do_child(struct ssh *ssh, Session *s, const char *command)
1.127 markus 1226: {
1227: extern char **environ;
1.314 djm 1228: char **env, *argv[ARGV_MAX], remote_id[512];
1.284 djm 1229: const char *shell, *shell0;
1.127 markus 1230: struct passwd *pw = s->pw;
1.239 djm 1231: int r = 0;
1.127 markus 1232:
1.314 djm 1233: sshpkt_fmt_connection_id(ssh, remote_id, sizeof(remote_id));
1234:
1.127 markus 1235: /* remove hostkey from the child's memory */
1236: destroy_sensitive_data();
1.312 djm 1237: ssh_packet_clear_keys(ssh);
1.127 markus 1238:
1.172 markus 1239: /* Force a password change */
1240: if (s->authctxt->force_pwchange) {
1241: do_setusercontext(pw);
1.292 djm 1242: child_close_fds(ssh);
1.172 markus 1243: do_pwchange(s);
1244: exit(1);
1245: }
1246:
1.127 markus 1247: /*
1248: * Login(1) does this as well, and it needs uid 0 for the "-h"
1249: * switch, so we let login(1) to this for us.
1250: */
1.284 djm 1251: do_nologin(pw);
1252: do_setusercontext(pw);
1.127 markus 1253:
1254: /*
1255: * Get the shell from the password data. An empty shell field is
1256: * legal, and means /bin/sh.
1257: */
1258: shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1.152 markus 1259:
1260: /*
1261: * Make sure $SHELL points to the shell from the password file,
1262: * even if shell is overridden from login.conf
1263: */
1.292 djm 1264: env = do_setup_env(ssh, s, shell);
1.152 markus 1265:
1.127 markus 1266: shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1267:
1.1 markus 1268: /*
1269: * Close the connection descriptors; note that this is the child, and
1270: * the server will still have the socket open, and it is important
1271: * that we do not shutdown it. Note that the descriptors cannot be
1272: * closed before building the environment, as we call
1.281 djm 1273: * ssh_remote_ipaddr there.
1.1 markus 1274: */
1.292 djm 1275: child_close_fds(ssh);
1.1 markus 1276:
1277: /*
1.125 deraadt 1278: * Must take new environment into use so that .ssh/rc,
1279: * /etc/ssh/sshrc and xauth are run in the proper environment.
1.1 markus 1280: */
1281: environ = env;
1.170 jakob 1282:
1283: #ifdef KRB5
1284: /*
1285: * At this point, we check to see if AFS is active and if we have
1286: * a valid Kerberos 5 TGT. If so, it seems like a good idea to see
1287: * if we can (and need to) extend the ticket into an AFS token. If
1288: * we don't do this, we run into potential problems if the user's
1289: * home directory is in AFS and it's not world-readable.
1290: */
1291:
1292: if (options.kerberos_get_afs_token && k_hasafs() &&
1.185 djm 1293: (s->authctxt->krb5_ctx != NULL)) {
1.170 jakob 1294: char cell[64];
1295:
1296: debug("Getting AFS token");
1297:
1298: k_setpag();
1299:
1300: if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1301: krb5_afslog(s->authctxt->krb5_ctx,
1302: s->authctxt->krb5_fwd_ccache, cell, NULL);
1303:
1304: krb5_afslog_home(s->authctxt->krb5_ctx,
1305: s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir);
1306: }
1307: #endif
1.104 markus 1308:
1.188 djm 1309: /* Change current directory to the user's home directory. */
1.316 deraadt 1310: if (chdir(pw->pw_dir) == -1) {
1.239 djm 1311: /* Suppress missing homedir warning for chroot case */
1312: r = login_getcapbool(lc, "requirehome", 0);
1.279 djm 1313: if (r || !in_chroot) {
1.239 djm 1314: fprintf(stderr, "Could not chdir to home "
1315: "directory %s: %s\n", pw->pw_dir,
1316: strerror(errno));
1.279 djm 1317: }
1.239 djm 1318: if (r)
1.104 markus 1319: exit(1);
1320: }
1.230 djm 1321:
1322: closefrom(STDERR_FILENO + 1);
1.1 markus 1323:
1.294 djm 1324: do_rc_files(ssh, s, shell);
1.67 markus 1325:
1326: /* restore SIGPIPE for child */
1.318 dtucker 1327: ssh_signal(SIGPIPE, SIG_DFL);
1.67 markus 1328:
1.248 djm 1329: if (s->is_subsystem == SUBSYSTEM_INT_SFTP_ERROR) {
1.314 djm 1330: error("Connection from %s: refusing non-sftp session",
1331: remote_id);
1.248 djm 1332: printf("This service allows sftp connections only.\n");
1333: fflush(NULL);
1334: exit(1);
1335: } else if (s->is_subsystem == SUBSYSTEM_INT_SFTP) {
1.225 markus 1336: extern int optind, optreset;
1337: int i;
1338: char *p, *args;
1339:
1.246 stevesk 1340: setproctitle("%s@%s", s->pw->pw_name, INTERNAL_SFTP_NAME);
1.243 millert 1341: args = xstrdup(command ? command : "sftp-server");
1.225 markus 1342: for (i = 0, (p = strtok(args, " ")); p; (p = strtok(NULL, " ")))
1343: if (i < ARGV_MAX - 1)
1344: argv[i++] = p;
1345: argv[i] = NULL;
1346: optind = optreset = 1;
1347: __progname = argv[0];
1.226 djm 1348: exit(sftp_server_main(i, argv, s->pw));
1.225 markus 1349: }
1.247 djm 1350:
1351: fflush(NULL);
1.225 markus 1352:
1.127 markus 1353: /* Get the last component of the shell name. */
1354: if ((shell0 = strrchr(shell, '/')) != NULL)
1355: shell0++;
1356: else
1357: shell0 = shell;
1358:
1.1 markus 1359: /*
1360: * If we have no command, execute the shell. In this case, the shell
1361: * name to be passed in argv[0] is preceded by '-' to indicate that
1362: * this is a login shell.
1363: */
1364: if (!command) {
1.127 markus 1365: char argv0[256];
1.1 markus 1366:
1.127 markus 1367: /* Start the shell. Set initial character to '-'. */
1368: argv0[0] = '-';
1.1 markus 1369:
1.127 markus 1370: if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1.128 markus 1371: >= sizeof(argv0) - 1) {
1.127 markus 1372: errno = EINVAL;
1.1 markus 1373: perror(shell);
1374: exit(1);
1.127 markus 1375: }
1.1 markus 1376:
1.127 markus 1377: /* Execute the shell. */
1378: argv[0] = argv0;
1379: argv[1] = NULL;
1380: execve(shell, argv, env);
1381:
1382: /* Executing the shell failed. */
1383: perror(shell);
1384: exit(1);
1.1 markus 1385: }
1386: /*
1387: * Execute the command using the user's shell. This uses the -c
1388: * option to execute the command.
1389: */
1.127 markus 1390: argv[0] = (char *) shell0;
1.1 markus 1391: argv[1] = "-c";
1392: argv[2] = (char *) command;
1393: argv[3] = NULL;
1394: execve(shell, argv, env);
1395: perror(shell);
1396: exit(1);
1397: }
1398:
1.237 djm 1399: void
1400: session_unused(int id)
1401: {
1.325 djm 1402: debug3_f("session id %d unused", id);
1.237 djm 1403: if (id >= options.max_sessions ||
1404: id >= sessions_nalloc) {
1.325 djm 1405: fatal_f("insane session id %d (max %d nalloc %d)",
1406: id, options.max_sessions, sessions_nalloc);
1.237 djm 1407: }
1.270 tedu 1408: memset(&sessions[id], 0, sizeof(*sessions));
1.237 djm 1409: sessions[id].self = id;
1410: sessions[id].used = 0;
1411: sessions[id].chanid = -1;
1412: sessions[id].ptyfd = -1;
1413: sessions[id].ttyfd = -1;
1414: sessions[id].ptymaster = -1;
1415: sessions[id].x11_chanids = NULL;
1416: sessions[id].next_unused = sessions_first_unused;
1417: sessions_first_unused = id;
1418: }
1419:
1.1 markus 1420: Session *
1421: session_new(void)
1422: {
1.237 djm 1423: Session *s, *tmp;
1424:
1425: if (sessions_first_unused == -1) {
1426: if (sessions_nalloc >= options.max_sessions)
1427: return NULL;
1.325 djm 1428: debug2_f("allocate (allocated %d max %d)",
1429: sessions_nalloc, options.max_sessions);
1.288 deraadt 1430: tmp = xrecallocarray(sessions, sessions_nalloc,
1431: sessions_nalloc + 1, sizeof(*sessions));
1.237 djm 1432: if (tmp == NULL) {
1.325 djm 1433: error_f("cannot allocate %d sessions",
1434: sessions_nalloc + 1);
1.237 djm 1435: return NULL;
1436: }
1437: sessions = tmp;
1438: session_unused(sessions_nalloc++);
1439: }
1440:
1441: if (sessions_first_unused >= sessions_nalloc ||
1442: sessions_first_unused < 0) {
1.325 djm 1443: fatal_f("insane first_unused %d max %d nalloc %d",
1444: sessions_first_unused, options.max_sessions,
1.237 djm 1445: sessions_nalloc);
1446: }
1447:
1448: s = &sessions[sessions_first_unused];
1.325 djm 1449: if (s->used)
1450: fatal_f("session %d already used", sessions_first_unused);
1.237 djm 1451: sessions_first_unused = s->next_unused;
1452: s->used = 1;
1453: s->next_unused = -1;
1454: debug("session_new: session %d", s->self);
1455:
1456: return s;
1.1 markus 1457: }
1458:
1.94 itojun 1459: static void
1.1 markus 1460: session_dump(void)
1461: {
1462: int i;
1.237 djm 1463: for (i = 0; i < sessions_nalloc; i++) {
1.1 markus 1464: Session *s = &sessions[i];
1.237 djm 1465:
1.329 djm 1466: debug("dump: used %d next_unused %d session %d "
1.237 djm 1467: "channel %d pid %ld",
1.1 markus 1468: s->used,
1.237 djm 1469: s->next_unused,
1.1 markus 1470: s->self,
1471: s->chanid,
1.137 mpech 1472: (long)s->pid);
1.1 markus 1473: }
1474: }
1475:
1.2 markus 1476: int
1.97 markus 1477: session_open(Authctxt *authctxt, int chanid)
1.2 markus 1478: {
1479: Session *s = session_new();
1480: debug("session_open: channel %d", chanid);
1481: if (s == NULL) {
1482: error("no more sessions");
1483: return 0;
1484: }
1.97 markus 1485: s->authctxt = authctxt;
1486: s->pw = authctxt->pw;
1.167 djm 1487: if (s->pw == NULL || !authctxt->valid)
1.54 stevesk 1488: fatal("no user for session %d", s->self);
1.2 markus 1489: debug("session_open: session %d: link with channel %d", s->self, chanid);
1490: s->chanid = chanid;
1491: return 1;
1492: }
1493:
1.130 provos 1494: Session *
1495: session_by_tty(char *tty)
1496: {
1497: int i;
1.237 djm 1498: for (i = 0; i < sessions_nalloc; i++) {
1.130 provos 1499: Session *s = &sessions[i];
1500: if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1501: debug("session_by_tty: session %d tty %s", i, tty);
1502: return s;
1503: }
1504: }
1505: debug("session_by_tty: unknown tty %.100s", tty);
1506: session_dump();
1507: return NULL;
1508: }
1509:
1.94 itojun 1510: static Session *
1.2 markus 1511: session_by_channel(int id)
1512: {
1513: int i;
1.237 djm 1514: for (i = 0; i < sessions_nalloc; i++) {
1.2 markus 1515: Session *s = &sessions[i];
1516: if (s->used && s->chanid == id) {
1.237 djm 1517: debug("session_by_channel: session %d channel %d",
1518: i, id);
1.2 markus 1519: return s;
1520: }
1521: }
1522: debug("session_by_channel: unknown channel %d", id);
1523: session_dump();
1524: return NULL;
1525: }
1526:
1.94 itojun 1527: static Session *
1.184 djm 1528: session_by_x11_channel(int id)
1529: {
1530: int i, j;
1531:
1.237 djm 1532: for (i = 0; i < sessions_nalloc; i++) {
1.184 djm 1533: Session *s = &sessions[i];
1534:
1535: if (s->x11_chanids == NULL || !s->used)
1536: continue;
1537: for (j = 0; s->x11_chanids[j] != -1; j++) {
1538: if (s->x11_chanids[j] == id) {
1539: debug("session_by_x11_channel: session %d "
1540: "channel %d", s->self, id);
1541: return s;
1542: }
1543: }
1544: }
1545: debug("session_by_x11_channel: unknown channel %d", id);
1546: session_dump();
1547: return NULL;
1548: }
1549:
1550: static Session *
1.2 markus 1551: session_by_pid(pid_t pid)
1552: {
1553: int i;
1.137 mpech 1554: debug("session_by_pid: pid %ld", (long)pid);
1.237 djm 1555: for (i = 0; i < sessions_nalloc; i++) {
1.2 markus 1556: Session *s = &sessions[i];
1557: if (s->used && s->pid == pid)
1558: return s;
1559: }
1.137 mpech 1560: error("session_by_pid: unknown pid %ld", (long)pid);
1.2 markus 1561: session_dump();
1562: return NULL;
1563: }
1564:
1.94 itojun 1565: static int
1.292 djm 1566: session_window_change_req(struct ssh *ssh, Session *s)
1.2 markus 1567: {
1.312 djm 1568: int r;
1569:
1570: if ((r = sshpkt_get_u32(ssh, &s->col)) != 0 ||
1571: (r = sshpkt_get_u32(ssh, &s->row)) != 0 ||
1572: (r = sshpkt_get_u32(ssh, &s->xpixel)) != 0 ||
1573: (r = sshpkt_get_u32(ssh, &s->ypixel)) != 0 ||
1574: (r = sshpkt_get_end(ssh)) != 0)
1575: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.2 markus 1576: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1577: return 1;
1578: }
1579:
1.94 itojun 1580: static int
1.292 djm 1581: session_pty_req(struct ssh *ssh, Session *s)
1.2 markus 1582: {
1.312 djm 1583: int r;
1.132 markus 1584:
1.294 djm 1585: if (!auth_opts->permit_pty_flag || !options.permit_tty) {
1586: debug("Allocating a pty not permitted for this connection.");
1.19 markus 1587: return 0;
1.86 markus 1588: }
1589: if (s->ttyfd != -1) {
1.312 djm 1590: ssh_packet_disconnect(ssh, "Protocol error: you already have a pty.");
1.3 markus 1591: return 0;
1.86 markus 1592: }
1593:
1.312 djm 1594: if ((r = sshpkt_get_cstring(ssh, &s->term, NULL)) != 0 ||
1595: (r = sshpkt_get_u32(ssh, &s->col)) != 0 ||
1596: (r = sshpkt_get_u32(ssh, &s->row)) != 0 ||
1597: (r = sshpkt_get_u32(ssh, &s->xpixel)) != 0 ||
1598: (r = sshpkt_get_u32(ssh, &s->ypixel)) != 0)
1599: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.2 markus 1600:
1601: if (strcmp(s->term, "") == 0) {
1.265 djm 1602: free(s->term);
1.2 markus 1603: s->term = NULL;
1604: }
1.86 markus 1605:
1.2 markus 1606: /* Allocate a pty and open it. */
1.86 markus 1607: debug("Allocating pty.");
1.237 djm 1608: if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty,
1609: sizeof(s->tty)))) {
1.265 djm 1610: free(s->term);
1.2 markus 1611: s->term = NULL;
1612: s->ptyfd = -1;
1613: s->ttyfd = -1;
1614: error("session_pty_req: session %d alloc failed", s->self);
1.3 markus 1615: return 0;
1.2 markus 1616: }
1617: debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1.86 markus 1618:
1.302 markus 1619: ssh_tty_parse_modes(ssh, s->ttyfd);
1.86 markus 1620:
1.312 djm 1621: if ((r = sshpkt_get_end(ssh)) != 0)
1622: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1623:
1.130 provos 1624: if (!use_privsep)
1625: pty_setowner(s->pw, s->tty);
1.86 markus 1626:
1627: /* Set window size from the packet. */
1.2 markus 1628: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1629:
1.9 markus 1630: session_proctitle(s);
1.2 markus 1631: return 1;
1632: }
1633:
1.94 itojun 1634: static int
1.292 djm 1635: session_subsystem_req(struct ssh *ssh, Session *s)
1.7 markus 1636: {
1.105 markus 1637: struct stat st;
1.312 djm 1638: int r, success = 0;
1.333 djm 1639: char *prog, *cmd, *type;
1.182 djm 1640: u_int i;
1.7 markus 1641:
1.312 djm 1642: if ((r = sshpkt_get_cstring(ssh, &s->subsys, NULL)) != 0 ||
1643: (r = sshpkt_get_end(ssh)) != 0)
1644: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.267 djm 1645: debug2("subsystem request for %.100s by user %s", s->subsys,
1.255 djm 1646: s->pw->pw_name);
1.18 jakob 1647:
1648: for (i = 0; i < options.num_subsystems; i++) {
1.267 djm 1649: if (strcmp(s->subsys, options.subsystem_name[i]) == 0) {
1.205 djm 1650: prog = options.subsystem_command[i];
1651: cmd = options.subsystem_args[i];
1.249 dtucker 1652: if (strcmp(INTERNAL_SFTP_NAME, prog) == 0) {
1.225 markus 1653: s->is_subsystem = SUBSYSTEM_INT_SFTP;
1.249 dtucker 1654: debug("subsystem: %s", prog);
1.225 markus 1655: } else {
1.316 deraadt 1656: if (stat(prog, &st) == -1)
1.249 dtucker 1657: debug("subsystem: cannot stat %s: %s",
1658: prog, strerror(errno));
1.225 markus 1659: s->is_subsystem = SUBSYSTEM_EXT;
1.249 dtucker 1660: debug("subsystem: exec() %s", cmd);
1.105 markus 1661: }
1.333 djm 1662: xasprintf(&type, "session:subsystem:%s",
1663: options.subsystem_name[i]);
1664: channel_set_xtype(ssh, s->chanid, type);
1665: free(type);
1.292 djm 1666: success = do_exec(ssh, s, cmd) == 0;
1.122 markus 1667: break;
1.18 jakob 1668: }
1669: }
1670:
1671: if (!success)
1.267 djm 1672: logit("subsystem request for %.100s by user %s failed, "
1673: "subsystem not found", s->subsys, s->pw->pw_name);
1.7 markus 1674:
1675: return success;
1676: }
1677:
1.94 itojun 1678: static int
1.292 djm 1679: session_x11_req(struct ssh *ssh, Session *s)
1.7 markus 1680: {
1.312 djm 1681: int r, success;
1682: u_char single_connection = 0;
1.7 markus 1683:
1.184 djm 1684: if (s->auth_proto != NULL || s->auth_data != NULL) {
1685: error("session_x11_req: session %d: "
1.190 stevesk 1686: "x11 forwarding already active", s->self);
1.184 djm 1687: return 0;
1688: }
1.312 djm 1689: if ((r = sshpkt_get_u8(ssh, &single_connection)) != 0 ||
1690: (r = sshpkt_get_cstring(ssh, &s->auth_proto, NULL)) != 0 ||
1691: (r = sshpkt_get_cstring(ssh, &s->auth_data, NULL)) != 0 ||
1692: (r = sshpkt_get_u32(ssh, &s->screen)) != 0 ||
1693: (r = sshpkt_get_end(ssh)) != 0)
1694: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1695:
1696: s->single_connection = single_connection;
1.7 markus 1697:
1.282 djm 1698: if (xauth_valid_string(s->auth_proto) &&
1699: xauth_valid_string(s->auth_data))
1.292 djm 1700: success = session_setup_x11fwd(ssh, s);
1.282 djm 1701: else {
1702: success = 0;
1703: error("Invalid X11 forwarding data");
1704: }
1.81 markus 1705: if (!success) {
1.265 djm 1706: free(s->auth_proto);
1707: free(s->auth_data);
1.84 markus 1708: s->auth_proto = NULL;
1709: s->auth_data = NULL;
1.7 markus 1710: }
1.81 markus 1711: return success;
1.7 markus 1712: }
1713:
1.94 itojun 1714: static int
1.292 djm 1715: session_shell_req(struct ssh *ssh, Session *s)
1.19 markus 1716: {
1.312 djm 1717: int r;
1718:
1719: if ((r = sshpkt_get_end(ssh)) != 0)
1720: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.333 djm 1721:
1722: channel_set_xtype(ssh, s->chanid, "session:shell");
1723:
1.292 djm 1724: return do_exec(ssh, s, NULL) == 0;
1.19 markus 1725: }
1726:
1.94 itojun 1727: static int
1.292 djm 1728: session_exec_req(struct ssh *ssh, Session *s)
1.19 markus 1729: {
1.312 djm 1730: u_int success;
1731: int r;
1732: char *command = NULL;
1733:
1734: if ((r = sshpkt_get_cstring(ssh, &command, NULL)) != 0 ||
1735: (r = sshpkt_get_end(ssh)) != 0)
1736: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.333 djm 1737:
1738: channel_set_xtype(ssh, s->chanid, "session:command");
1.237 djm 1739:
1.292 djm 1740: success = do_exec(ssh, s, command) == 0;
1.265 djm 1741: free(command);
1.237 djm 1742: return success;
1.19 markus 1743: }
1744:
1.94 itojun 1745: static int
1.292 djm 1746: session_break_req(struct ssh *ssh, Session *s)
1.157 markus 1747: {
1.312 djm 1748: int r;
1.157 markus 1749:
1.312 djm 1750: if ((r = sshpkt_get_u32(ssh, NULL)) != 0 || /* ignore */
1751: (r = sshpkt_get_end(ssh)) != 0)
1752: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.157 markus 1753:
1.316 deraadt 1754: if (s->ptymaster == -1 || tcsendbreak(s->ptymaster, 0) == -1)
1.157 markus 1755: return 0;
1756: return 1;
1757: }
1758:
1759: static int
1.292 djm 1760: session_env_req(struct ssh *ssh, Session *s)
1.173 djm 1761: {
1762: char *name, *val;
1.312 djm 1763: u_int i;
1764: int r;
1.173 djm 1765:
1.312 djm 1766: if ((r = sshpkt_get_cstring(ssh, &name, NULL)) != 0 ||
1767: (r = sshpkt_get_cstring(ssh, &val, NULL)) != 0 ||
1768: (r = sshpkt_get_end(ssh)) != 0)
1769: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.173 djm 1770:
1771: /* Don't set too many environment variables */
1772: if (s->num_env > 128) {
1773: debug2("Ignoring env request %s: too many env vars", name);
1774: goto fail;
1775: }
1776:
1777: for (i = 0; i < options.num_accept_env; i++) {
1778: if (match_pattern(name, options.accept_env[i])) {
1779: debug2("Setting env %d: %s=%s", s->num_env, name, val);
1.288 deraadt 1780: s->env = xrecallocarray(s->env, s->num_env,
1781: s->num_env + 1, sizeof(*s->env));
1.173 djm 1782: s->env[s->num_env].name = name;
1783: s->env[s->num_env].val = val;
1784: s->num_env++;
1785: return (1);
1786: }
1787: }
1788: debug2("Ignoring env request %s: disallowed name", name);
1789:
1790: fail:
1.265 djm 1791: free(name);
1792: free(val);
1.173 djm 1793: return (0);
1794: }
1795:
1.306 djm 1796: /*
1797: * Conversion of signals from ssh channel request names.
1798: * Subset of signals from RFC 4254 section 6.10C, with SIGINFO as
1799: * local extension.
1800: */
1801: static int
1802: name2sig(char *name)
1803: {
1804: #define SSH_SIG(x) if (strcmp(name, #x) == 0) return SIG ## x
1805: SSH_SIG(HUP);
1806: SSH_SIG(INT);
1807: SSH_SIG(KILL);
1808: SSH_SIG(QUIT);
1809: SSH_SIG(TERM);
1810: SSH_SIG(USR1);
1811: SSH_SIG(USR2);
1812: #undef SSH_SIG
1813: if (strcmp(name, "INFO@openssh.com") == 0)
1814: return SIGINFO;
1815: return -1;
1816: }
1817:
1818: static int
1819: session_signal_req(struct ssh *ssh, Session *s)
1820: {
1821: char *signame = NULL;
1822: int r, sig, success = 0;
1823:
1824: if ((r = sshpkt_get_cstring(ssh, &signame, NULL)) != 0 ||
1825: (r = sshpkt_get_end(ssh)) != 0) {
1.325 djm 1826: error_fr(r, "parse");
1.306 djm 1827: goto out;
1828: }
1829: if ((sig = name2sig(signame)) == -1) {
1.325 djm 1830: error_f("unsupported signal \"%s\"", signame);
1.306 djm 1831: goto out;
1832: }
1833: if (s->pid <= 0) {
1.325 djm 1834: error_f("no pid for session %d", s->self);
1.306 djm 1835: goto out;
1836: }
1837: if (s->forced || s->is_subsystem) {
1.325 djm 1838: error_f("refusing to send signal %s to %s session",
1.306 djm 1839: signame, s->forced ? "forced-command" : "subsystem");
1840: goto out;
1841: }
1842: if (!use_privsep || mm_is_monitor()) {
1.325 djm 1843: error_f("session signalling requires privilege separation");
1.306 djm 1844: goto out;
1845: }
1846:
1.325 djm 1847: debug_f("signal %s, killpg(%ld, %d)", signame, (long)s->pid, sig);
1.306 djm 1848: temporarily_use_uid(s->pw);
1849: r = killpg(s->pid, sig);
1850: restore_uid();
1851: if (r != 0) {
1.325 djm 1852: error_f("killpg(%ld, %d): %s", (long)s->pid,
1.306 djm 1853: sig, strerror(errno));
1854: goto out;
1855: }
1856:
1857: /* success */
1858: success = 1;
1859: out:
1860: free(signame);
1861: return success;
1862: }
1863:
1.173 djm 1864: static int
1.292 djm 1865: session_auth_agent_req(struct ssh *ssh, Session *s)
1.43 markus 1866: {
1867: static int called = 0;
1.312 djm 1868: int r;
1.294 djm 1869:
1.312 djm 1870: if ((r = sshpkt_get_end(ssh)) != 0)
1871: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.294 djm 1872: if (!auth_opts->permit_agent_forwarding_flag ||
1873: !options.allow_agent_forwarding) {
1.325 djm 1874: debug_f("agent forwarding disabled");
1.44 markus 1875: return 0;
1876: }
1.43 markus 1877: if (called) {
1878: return 0;
1879: } else {
1880: called = 1;
1.292 djm 1881: return auth_input_request_forwarding(ssh, s->pw);
1.43 markus 1882: }
1883: }
1884:
1.123 markus 1885: int
1.292 djm 1886: session_input_channel_req(struct ssh *ssh, Channel *c, const char *rtype)
1.2 markus 1887: {
1888: int success = 0;
1889: Session *s;
1890:
1.123 markus 1891: if ((s = session_by_channel(c->self)) == NULL) {
1.325 djm 1892: logit_f("no session %d req %.100s", c->self, rtype);
1.123 markus 1893: return 0;
1894: }
1.325 djm 1895: debug_f("session %d req %s", s->self, rtype);
1.2 markus 1896:
1897: /*
1.64 markus 1898: * a session is in LARVAL state until a shell, a command
1899: * or a subsystem is executed
1.2 markus 1900: */
1901: if (c->type == SSH_CHANNEL_LARVAL) {
1902: if (strcmp(rtype, "shell") == 0) {
1.292 djm 1903: success = session_shell_req(ssh, s);
1.2 markus 1904: } else if (strcmp(rtype, "exec") == 0) {
1.292 djm 1905: success = session_exec_req(ssh, s);
1.2 markus 1906: } else if (strcmp(rtype, "pty-req") == 0) {
1.292 djm 1907: success = session_pty_req(ssh, s);
1.7 markus 1908: } else if (strcmp(rtype, "x11-req") == 0) {
1.292 djm 1909: success = session_x11_req(ssh, s);
1.43 markus 1910: } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1.292 djm 1911: success = session_auth_agent_req(ssh, s);
1.7 markus 1912: } else if (strcmp(rtype, "subsystem") == 0) {
1.292 djm 1913: success = session_subsystem_req(ssh, s);
1.173 djm 1914: } else if (strcmp(rtype, "env") == 0) {
1.292 djm 1915: success = session_env_req(ssh, s);
1.2 markus 1916: }
1917: }
1918: if (strcmp(rtype, "window-change") == 0) {
1.292 djm 1919: success = session_window_change_req(ssh, s);
1.177 djm 1920: } else if (strcmp(rtype, "break") == 0) {
1.292 djm 1921: success = session_break_req(ssh, s);
1.306 djm 1922: } else if (strcmp(rtype, "signal") == 0) {
1923: success = session_signal_req(ssh, s);
1.2 markus 1924: }
1.177 djm 1925:
1.123 markus 1926: return success;
1.2 markus 1927: }
1928:
1929: void
1.292 djm 1930: session_set_fds(struct ssh *ssh, Session *s,
1931: int fdin, int fdout, int fderr, int ignore_fderr, int is_tty)
1.2 markus 1932: {
1933: /*
1934: * now that have a child and a pipe to the child,
1935: * we can activate our channel and register the fd's
1936: */
1937: if (s->chanid == -1)
1938: fatal("no channel for session %d", s->self);
1.292 djm 1939: channel_set_fds(ssh, s->chanid,
1.2 markus 1940: fdout, fdin, fderr,
1.256 djm 1941: ignore_fderr ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1.241 dtucker 1942: 1, is_tty, CHAN_SES_WINDOW_DEFAULT);
1.2 markus 1943: }
1944:
1.85 markus 1945: /*
1946: * Function to perform pty cleanup. Also called if we get aborted abnormally
1947: * (e.g., due to a dropped connection).
1948: */
1.130 provos 1949: void
1.165 markus 1950: session_pty_cleanup2(Session *s)
1.1 markus 1951: {
1.85 markus 1952: if (s == NULL) {
1.325 djm 1953: error_f("no session");
1.85 markus 1954: return;
1955: }
1956: if (s->ttyfd == -1)
1.1 markus 1957: return;
1958:
1.325 djm 1959: debug_f("session %d release %s", s->self, s->tty);
1.1 markus 1960:
1961: /* Record that the user has logged out. */
1.85 markus 1962: if (s->pid != 0)
1963: record_logout(s->pid, s->tty);
1.1 markus 1964:
1965: /* Release the pseudo-tty. */
1.130 provos 1966: if (getuid() == 0)
1967: pty_release(s->tty);
1.1 markus 1968:
1969: /*
1970: * Close the server side of the socket pairs. We must do this after
1971: * the pty cleanup, so that another process doesn't get this pty
1972: * while we're still cleaning up.
1973: */
1.316 deraadt 1974: if (s->ptymaster != -1 && close(s->ptymaster) == -1)
1.237 djm 1975: error("close(s->ptymaster/%d): %s",
1976: s->ptymaster, strerror(errno));
1.108 markus 1977:
1978: /* unlink pty from session */
1979: s->ttyfd = -1;
1.2 markus 1980: }
1981:
1.130 provos 1982: void
1.165 markus 1983: session_pty_cleanup(Session *s)
1.130 provos 1984: {
1.165 markus 1985: PRIVSEP(session_pty_cleanup2(s));
1.130 provos 1986: }
1987:
1.147 markus 1988: static char *
1989: sig2name(int sig)
1990: {
1991: #define SSH_SIG(x) if (sig == SIG ## x) return #x
1992: SSH_SIG(ABRT);
1993: SSH_SIG(ALRM);
1994: SSH_SIG(FPE);
1995: SSH_SIG(HUP);
1996: SSH_SIG(ILL);
1997: SSH_SIG(INT);
1998: SSH_SIG(KILL);
1999: SSH_SIG(PIPE);
2000: SSH_SIG(QUIT);
2001: SSH_SIG(SEGV);
2002: SSH_SIG(TERM);
2003: SSH_SIG(USR1);
2004: SSH_SIG(USR2);
2005: #undef SSH_SIG
2006: return "SIG@openssh.com";
2007: }
2008:
1.94 itojun 2009: static void
1.292 djm 2010: session_close_x11(struct ssh *ssh, int id)
1.184 djm 2011: {
2012: Channel *c;
2013:
1.292 djm 2014: if ((c = channel_by_id(ssh, id)) == NULL) {
1.325 djm 2015: debug_f("x11 channel %d missing", id);
1.184 djm 2016: } else {
2017: /* Detach X11 listener */
1.325 djm 2018: debug_f("detach x11 channel %d", id);
1.292 djm 2019: channel_cancel_cleanup(ssh, id);
1.184 djm 2020: if (c->ostate != CHAN_OUTPUT_CLOSED)
1.292 djm 2021: chan_mark_dead(ssh, c);
1.184 djm 2022: }
2023: }
2024:
2025: static void
1.331 djm 2026: session_close_single_x11(struct ssh *ssh, int id, int force, void *arg)
1.184 djm 2027: {
2028: Session *s;
2029: u_int i;
2030:
1.325 djm 2031: debug3_f("channel %d", id);
1.292 djm 2032: channel_cancel_cleanup(ssh, id);
1.221 stevesk 2033: if ((s = session_by_x11_channel(id)) == NULL)
1.325 djm 2034: fatal_f("no x11 channel %d", id);
1.184 djm 2035: for (i = 0; s->x11_chanids[i] != -1; i++) {
1.325 djm 2036: debug_f("session %d: closing channel %d",
2037: s->self, s->x11_chanids[i]);
1.184 djm 2038: /*
2039: * The channel "id" is already closing, but make sure we
2040: * close all of its siblings.
2041: */
2042: if (s->x11_chanids[i] != id)
1.292 djm 2043: session_close_x11(ssh, s->x11_chanids[i]);
1.184 djm 2044: }
1.265 djm 2045: free(s->x11_chanids);
1.184 djm 2046: s->x11_chanids = NULL;
1.265 djm 2047: free(s->display);
2048: s->display = NULL;
2049: free(s->auth_proto);
2050: s->auth_proto = NULL;
2051: free(s->auth_data);
2052: s->auth_data = NULL;
2053: free(s->auth_display);
2054: s->auth_display = NULL;
1.184 djm 2055: }
2056:
2057: static void
1.292 djm 2058: session_exit_message(struct ssh *ssh, Session *s, int status)
1.2 markus 2059: {
2060: Channel *c;
1.312 djm 2061: int r;
1.124 markus 2062:
1.292 djm 2063: if ((c = channel_lookup(ssh, s->chanid)) == NULL)
1.325 djm 2064: fatal_f("session %d: no channel %d", s->self, s->chanid);
2065: debug_f("session %d channel %d pid %ld",
2066: s->self, s->chanid, (long)s->pid);
1.2 markus 2067:
2068: if (WIFEXITED(status)) {
1.292 djm 2069: channel_request_start(ssh, s->chanid, "exit-status", 0);
1.312 djm 2070: if ((r = sshpkt_put_u32(ssh, WEXITSTATUS(status))) != 0 ||
2071: (r = sshpkt_send(ssh)) != 0)
2072: sshpkt_fatal(ssh, r, "%s: exit reply", __func__);
1.2 markus 2073: } else if (WIFSIGNALED(status)) {
1.292 djm 2074: channel_request_start(ssh, s->chanid, "exit-signal", 0);
1.312 djm 2075: if ((r = sshpkt_put_cstring(ssh, sig2name(WTERMSIG(status)))) != 0 ||
2076: (r = sshpkt_put_u8(ssh, WCOREDUMP(status)? 1 : 0)) != 0 ||
2077: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
2078: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
2079: (r = sshpkt_send(ssh)) != 0)
2080: sshpkt_fatal(ssh, r, "%s: exit reply", __func__);
1.2 markus 2081: } else {
2082: /* Some weird exit cause. Just exit. */
1.312 djm 2083: ssh_packet_disconnect(ssh, "wait returned status %04x.", status);
1.2 markus 2084: }
2085:
2086: /* disconnect channel */
1.325 djm 2087: debug_f("release channel %d", s->chanid);
1.187 djm 2088:
2089: /*
2090: * Adjust cleanup callback attachment to send close messages when
1.199 deraadt 2091: * the channel gets EOF. The session will be then be closed
1.319 djm 2092: * by session_close_by_channel when the child sessions close their fds.
1.187 djm 2093: */
1.292 djm 2094: channel_register_cleanup(ssh, c->self, session_close_by_channel, 1);
1.187 djm 2095:
1.5 markus 2096: /*
2097: * emulate a write failure with 'chan_write_failed', nobody will be
2098: * interested in data we write.
2099: * Note that we must not call 'chan_read_failed', since there could
2100: * be some more data waiting in the pipe.
2101: */
1.8 markus 2102: if (c->ostate != CHAN_OUTPUT_CLOSED)
1.292 djm 2103: chan_write_failed(ssh, c);
1.2 markus 2104: }
2105:
1.130 provos 2106: void
1.292 djm 2107: session_close(struct ssh *ssh, Session *s)
1.2 markus 2108: {
1.182 djm 2109: u_int i;
1.173 djm 2110:
1.280 djm 2111: verbose("Close session: user %s from %.200s port %d id %d",
2112: s->pw->pw_name,
1.281 djm 2113: ssh_remote_ipaddr(ssh),
2114: ssh_remote_port(ssh),
1.280 djm 2115: s->self);
2116:
1.165 markus 2117: if (s->ttyfd != -1)
1.85 markus 2118: session_pty_cleanup(s);
1.265 djm 2119: free(s->term);
2120: free(s->display);
2121: free(s->x11_chanids);
2122: free(s->auth_display);
2123: free(s->auth_data);
2124: free(s->auth_proto);
1.267 djm 2125: free(s->subsys);
1.219 djm 2126: if (s->env != NULL) {
2127: for (i = 0; i < s->num_env; i++) {
1.265 djm 2128: free(s->env[i].name);
2129: free(s->env[i].val);
1.219 djm 2130: }
1.265 djm 2131: free(s->env);
1.173 djm 2132: }
1.9 markus 2133: session_proctitle(s);
1.237 djm 2134: session_unused(s->self);
1.2 markus 2135: }
2136:
2137: void
1.292 djm 2138: session_close_by_pid(struct ssh *ssh, pid_t pid, int status)
1.2 markus 2139: {
2140: Session *s = session_by_pid(pid);
2141: if (s == NULL) {
1.325 djm 2142: debug_f("no session for pid %ld", (long)pid);
1.2 markus 2143: return;
2144: }
2145: if (s->chanid != -1)
1.292 djm 2146: session_exit_message(ssh, s, status);
1.187 djm 2147: if (s->ttyfd != -1)
2148: session_pty_cleanup(s);
1.197 djm 2149: s->pid = 0;
1.98 markus 2150: }
2151:
1.2 markus 2152: /*
2153: * this is called when a channel dies before
2154: * the session 'child' itself dies
2155: */
2156: void
1.331 djm 2157: session_close_by_channel(struct ssh *ssh, int id, int force, void *arg)
1.2 markus 2158: {
2159: Session *s = session_by_channel(id);
1.187 djm 2160: u_int i;
1.184 djm 2161:
1.2 markus 2162: if (s == NULL) {
1.325 djm 2163: debug_f("no session for id %d", id);
1.2 markus 2164: return;
2165: }
1.325 djm 2166: debug_f("channel %d child %ld", id, (long)s->pid);
1.107 markus 2167: if (s->pid != 0) {
1.325 djm 2168: debug_f("channel %d: has child, ttyfd %d", id, s->ttyfd);
1.108 markus 2169: /*
1.331 djm 2170: * delay detach of session (unless this is a forced close),
2171: * but release pty, since the fd's to the child are already
2172: * closed
1.108 markus 2173: */
1.165 markus 2174: if (s->ttyfd != -1)
1.108 markus 2175: session_pty_cleanup(s);
1.331 djm 2176: if (!force)
2177: return;
1.107 markus 2178: }
2179: /* detach by removing callback */
1.292 djm 2180: channel_cancel_cleanup(ssh, s->chanid);
1.187 djm 2181:
2182: /* Close any X11 listeners associated with this session */
2183: if (s->x11_chanids != NULL) {
2184: for (i = 0; s->x11_chanids[i] != -1; i++) {
1.292 djm 2185: session_close_x11(ssh, s->x11_chanids[i]);
1.187 djm 2186: s->x11_chanids[i] = -1;
2187: }
2188: }
2189:
1.2 markus 2190: s->chanid = -1;
1.292 djm 2191: session_close(ssh, s);
1.106 markus 2192: }
2193:
2194: void
1.292 djm 2195: session_destroy_all(struct ssh *ssh, void (*closefunc)(Session *))
1.106 markus 2196: {
2197: int i;
1.237 djm 2198: for (i = 0; i < sessions_nalloc; i++) {
1.106 markus 2199: Session *s = &sessions[i];
1.130 provos 2200: if (s->used) {
2201: if (closefunc != NULL)
2202: closefunc(s);
2203: else
1.292 djm 2204: session_close(ssh, s);
1.130 provos 2205: }
1.2 markus 2206: }
1.9 markus 2207: }
2208:
1.94 itojun 2209: static char *
1.9 markus 2210: session_tty_list(void)
2211: {
2212: static char buf[1024];
2213: int i;
2214: buf[0] = '\0';
1.237 djm 2215: for (i = 0; i < sessions_nalloc; i++) {
1.9 markus 2216: Session *s = &sessions[i];
2217: if (s->used && s->ttyfd != -1) {
2218: if (buf[0] != '\0')
2219: strlcat(buf, ",", sizeof buf);
2220: strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
2221: }
2222: }
2223: if (buf[0] == '\0')
2224: strlcpy(buf, "notty", sizeof buf);
2225: return buf;
2226: }
2227:
2228: void
2229: session_proctitle(Session *s)
2230: {
2231: if (s->pw == NULL)
2232: error("no user for session %d", s->self);
2233: else
2234: setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1.81 markus 2235: }
2236:
2237: int
1.292 djm 2238: session_setup_x11fwd(struct ssh *ssh, Session *s)
1.81 markus 2239: {
2240: struct stat st;
1.109 stevesk 2241: char display[512], auth_display[512];
1.272 djm 2242: char hostname[NI_MAXHOST];
1.184 djm 2243: u_int i;
1.81 markus 2244:
1.294 djm 2245: if (!auth_opts->permit_x11_forwarding_flag) {
1.312 djm 2246: ssh_packet_send_debug(ssh, "X11 forwarding disabled by key options.");
1.81 markus 2247: return 0;
2248: }
2249: if (!options.x11_forwarding) {
2250: debug("X11 forwarding disabled in server configuration file.");
2251: return 0;
2252: }
1.275 djm 2253: if (options.xauth_location == NULL ||
1.81 markus 2254: (stat(options.xauth_location, &st) == -1)) {
1.312 djm 2255: ssh_packet_send_debug(ssh, "No xauth program; cannot forward X11.");
1.81 markus 2256: return 0;
2257: }
1.87 markus 2258: if (s->display != NULL) {
1.81 markus 2259: debug("X11 display already set.");
2260: return 0;
2261: }
1.292 djm 2262: if (x11_create_display_inet(ssh, options.x11_display_offset,
1.140 deraadt 2263: options.x11_use_localhost, s->single_connection,
1.184 djm 2264: &s->display_number, &s->x11_chanids) == -1) {
1.87 markus 2265: debug("x11_create_display_inet failed.");
1.81 markus 2266: return 0;
1.184 djm 2267: }
2268: for (i = 0; s->x11_chanids[i] != -1; i++) {
1.292 djm 2269: channel_register_cleanup(ssh, s->x11_chanids[i],
1.187 djm 2270: session_close_single_x11, 0);
1.81 markus 2271: }
1.109 stevesk 2272:
2273: /* Set up a suitable value for the DISPLAY variable. */
1.316 deraadt 2274: if (gethostname(hostname, sizeof(hostname)) == -1)
1.109 stevesk 2275: fatal("gethostname: %.100s", strerror(errno));
2276: /*
2277: * auth_display must be used as the displayname when the
2278: * authorization entry is added with xauth(1). This will be
2279: * different than the DISPLAY string for localhost displays.
2280: */
1.119 stevesk 2281: if (options.x11_use_localhost) {
1.140 deraadt 2282: snprintf(display, sizeof display, "localhost:%u.%u",
1.109 stevesk 2283: s->display_number, s->screen);
1.140 deraadt 2284: snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
1.118 stevesk 2285: s->display_number, s->screen);
1.109 stevesk 2286: s->display = xstrdup(display);
1.118 stevesk 2287: s->auth_display = xstrdup(auth_display);
1.109 stevesk 2288: } else {
1.140 deraadt 2289: snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
1.109 stevesk 2290: s->display_number, s->screen);
2291: s->display = xstrdup(display);
1.118 stevesk 2292: s->auth_display = xstrdup(display);
1.109 stevesk 2293: }
2294:
1.81 markus 2295: return 1;
1.2 markus 2296: }
2297:
1.94 itojun 2298: static void
1.292 djm 2299: do_authenticated2(struct ssh *ssh, Authctxt *authctxt)
1.2 markus 2300: {
1.292 djm 2301: server_loop2(ssh, authctxt);
1.165 markus 2302: }
2303:
2304: void
1.292 djm 2305: do_cleanup(struct ssh *ssh, Authctxt *authctxt)
1.165 markus 2306: {
2307: static int called = 0;
2308:
2309: debug("do_cleanup");
2310:
2311: /* no cleanup if we're in the child for login shell */
2312: if (is_child)
2313: return;
2314:
2315: /* avoid double cleanup */
2316: if (called)
2317: return;
2318: called = 1;
2319:
1.218 markus 2320: if (authctxt == NULL || !authctxt->authenticated)
1.165 markus 2321: return;
2322: #ifdef KRB5
2323: if (options.kerberos_ticket_cleanup &&
2324: authctxt->krb5_ctx)
2325: krb5_cleanup_proc(authctxt);
1.161 markus 2326: #endif
1.165 markus 2327:
2328: #ifdef GSSAPI
1.283 markus 2329: if (options.gss_cleanup_creds)
1.165 markus 2330: ssh_gssapi_cleanup_creds();
2331: #endif
2332:
2333: /* remove agent socket */
2334: auth_sock_cleanup_proc(authctxt->pw);
1.290 djm 2335:
2336: /* remove userauth info */
2337: if (auth_info_file != NULL) {
2338: temporarily_use_uid(authctxt->pw);
2339: unlink(auth_info_file);
2340: restore_uid();
2341: free(auth_info_file);
2342: auth_info_file = NULL;
2343: }
1.165 markus 2344:
2345: /*
2346: * Cleanup ptys/utmp only if privsep is disabled,
2347: * or if running in monitor.
2348: */
2349: if (!use_privsep || mm_is_monitor())
1.292 djm 2350: session_destroy_all(ssh, session_pty_cleanup2);
1.1 markus 2351: }
1.281 djm 2352:
2353: /* Return a name for the remote host that fits inside utmp_size */
2354:
2355: const char *
2356: session_get_remote_name_or_ip(struct ssh *ssh, u_int utmp_size, int use_dns)
2357: {
2358: const char *remote = "";
2359:
2360: if (utmp_size > 0)
2361: remote = auth_get_canonical_hostname(ssh, use_dns);
2362: if (utmp_size == 0 || strlen(remote) > utmp_size)
2363: remote = ssh_remote_ipaddr(ssh);
2364: return remote;
2365: }
2366:
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