Annotation of src/usr.bin/ssh/session.c, Revision 1.338
1.338 ! djm 1: /* $OpenBSD: session.c,v 1.337 2024/02/01 02:37:33 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:
709: /*
710: * Get IP address of client. If the connection is not a socket, let
711: * the address be 0.0.0.0.
712: */
713: memset(&from, 0, sizeof(from));
1.148 stevesk 714: fromlen = sizeof(from);
1.312 djm 715: if (ssh_packet_connection_is_on_socket(ssh)) {
716: if (getpeername(ssh_packet_get_connection_in(ssh),
1.316 deraadt 717: (struct sockaddr *)&from, &fromlen) == -1) {
1.24 markus 718: debug("getpeername: %.100s", strerror(errno));
1.165 markus 719: cleanup_exit(255);
1.24 markus 720: }
721: }
1.25 markus 722:
1.73 djm 723: if (check_quietlogin(s, command))
1.24 markus 724: return;
1.73 djm 725:
1.179 dtucker 726: display_loginmsg();
1.73 djm 727:
728: do_motd();
729: }
730:
731: /*
732: * Display the message of the day.
733: */
734: void
735: do_motd(void)
736: {
737: FILE *f;
738: char buf[256];
739:
1.24 markus 740: if (options.print_motd) {
1.28 millert 741: f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
742: "/etc/motd"), "r");
1.24 markus 743: if (f) {
744: while (fgets(buf, sizeof(buf), f))
745: fputs(buf, stdout);
746: fclose(f);
747: }
1.2 markus 748: }
1.73 djm 749: }
750:
751:
752: /*
753: * Check for quiet login, either .hushlogin or command given.
754: */
755: int
756: check_quietlogin(Session *s, const char *command)
757: {
758: char buf[256];
1.96 dugsong 759: struct passwd *pw = s->pw;
1.73 djm 760: struct stat st;
761:
762: /* Return 1 if .hushlogin exists or a command given. */
763: if (command != NULL)
764: return 1;
765: snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
766: if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
767: return 1;
768: return 0;
1.1 markus 769: }
770:
771: /*
772: * Reads environment variables from the given file and adds/overrides them
773: * into the environment. If the file does not exist, this does nothing.
774: * Otherwise, it must consist of empty lines, comments (line starts with '#')
775: * and assignments of the form name=value. No other forms are allowed.
1.323 djm 776: * If allowlist is not NULL, then it is interpreted as a pattern list and
1.301 djm 777: * only variable names that match it will be accepted.
1.1 markus 778: */
1.94 itojun 779: static void
1.45 markus 780: read_environment_file(char ***env, u_int *envsize,
1.323 djm 781: const char *filename, const char *allowlist)
1.1 markus 782: {
783: FILE *f;
1.298 markus 784: char *line = NULL, *cp, *value;
785: size_t linesize = 0;
1.142 deraadt 786: u_int lineno = 0;
1.1 markus 787:
788: f = fopen(filename, "r");
789: if (!f)
790: return;
791:
1.298 markus 792: while (getline(&line, &linesize, f) != -1) {
1.142 deraadt 793: if (++lineno > 1000)
794: fatal("Too many lines in environment file %s", filename);
1.298 markus 795: for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
1.1 markus 796: ;
797: if (!*cp || *cp == '#' || *cp == '\n')
798: continue;
1.224 gilles 799:
800: cp[strcspn(cp, "\n")] = '\0';
801:
1.1 markus 802: value = strchr(cp, '=');
803: if (value == NULL) {
1.142 deraadt 804: fprintf(stderr, "Bad line %u in %.100s\n", lineno,
805: filename);
1.1 markus 806: continue;
807: }
1.14 deraadt 808: /*
809: * Replace the equals sign by nul, and advance value to
810: * the value string.
811: */
1.1 markus 812: *value = '\0';
813: value++;
1.323 djm 814: if (allowlist != NULL &&
815: match_pattern_list(cp, allowlist, 0) != 1)
1.301 djm 816: continue;
1.1 markus 817: child_set_env(env, envsize, cp, value);
818: }
1.298 markus 819: free(line);
1.1 markus 820: fclose(f);
821: }
822:
1.127 markus 823: static char **
1.292 djm 824: do_setup_env(struct ssh *ssh, Session *s, const char *shell)
1.1 markus 825: {
826: char buf[256];
1.294 djm 827: size_t n;
1.127 markus 828: u_int i, envsize;
1.300 djm 829: char *ocp, *cp, *value, **env, *laddr;
1.127 markus 830: struct passwd *pw = s->pw;
1.1 markus 831:
832: /* Initialize the environment. */
833: envsize = 100;
1.220 djm 834: env = xcalloc(envsize, sizeof(char *));
1.1 markus 835: env[0] = NULL;
836:
1.161 markus 837: #ifdef GSSAPI
1.168 djm 838: /* Allow any GSSAPI methods that we've used to alter
1.319 djm 839: * the child's environment as they see fit
1.161 markus 840: */
841: ssh_gssapi_do_child(&env, &envsize);
842: #endif
843:
1.284 djm 844: /* Set basic environment. */
845: for (i = 0; i < s->num_env; i++)
846: child_set_env(&env, &envsize, s->env[i].name, s->env[i].val);
847:
848: child_set_env(&env, &envsize, "USER", pw->pw_name);
849: child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
850: child_set_env(&env, &envsize, "HOME", pw->pw_dir);
851: if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
852: child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
853: else
854: child_set_env(&env, &envsize, "PATH", getenv("PATH"));
855:
856: snprintf(buf, sizeof buf, "%.200s/%.50s", _PATH_MAILDIR, pw->pw_name);
857: child_set_env(&env, &envsize, "MAIL", buf);
858:
859: /* Normal systems set SHELL by default. */
860: child_set_env(&env, &envsize, "SHELL", shell);
1.1 markus 861:
862: if (getenv("TZ"))
863: child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1.299 djm 864: if (s->term)
865: child_set_env(&env, &envsize, "TERM", s->term);
866: if (s->display)
867: child_set_env(&env, &envsize, "DISPLAY", s->display);
868: #ifdef KRB5
869: if (s->authctxt->krb5_ticket_file)
870: child_set_env(&env, &envsize, "KRB5CCNAME",
871: s->authctxt->krb5_ticket_file);
872: #endif
873: if (auth_sock_name != NULL)
874: child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
875: auth_sock_name);
876:
1.1 markus 877:
1.294 djm 878: /* Set custom environment options from pubkey authentication. */
879: if (options.permit_user_env) {
880: for (n = 0 ; n < auth_opts->nenv; n++) {
881: ocp = xstrdup(auth_opts->env[n]);
882: cp = strchr(ocp, '=');
1.326 djm 883: if (cp != NULL) {
1.294 djm 884: *cp = '\0';
1.323 djm 885: /* Apply PermitUserEnvironment allowlist */
886: if (options.permit_user_env_allowlist == NULL ||
1.301 djm 887: match_pattern_list(ocp,
1.323 djm 888: options.permit_user_env_allowlist, 0) == 1)
1.301 djm 889: child_set_env(&env, &envsize,
890: ocp, cp + 1);
1.294 djm 891: }
892: free(ocp);
893: }
1.1 markus 894: }
895:
1.299 djm 896: /* read $HOME/.ssh/environment. */
897: if (options.permit_user_env) {
1.327 djm 898: snprintf(buf, sizeof buf, "%.200s/%s/environment",
899: pw->pw_dir, _PATH_SSH_USER_DIR);
1.301 djm 900: read_environment_file(&env, &envsize, buf,
1.323 djm 901: options.permit_user_env_allowlist);
1.300 djm 902: }
903:
904: /* Environment specified by admin */
905: for (i = 0; i < options.num_setenv; i++) {
906: cp = xstrdup(options.setenv[i]);
907: if ((value = strchr(cp, '=')) == NULL) {
908: /* shouldn't happen; vars are checked in servconf.c */
909: fatal("Invalid config SetEnv: %s", options.setenv[i]);
910: }
911: *value++ = '\0';
912: child_set_env(&env, &envsize, cp, value);
1.335 dtucker 913: free(cp);
1.299 djm 914: }
915:
1.149 stevesk 916: /* SSH_CLIENT deprecated */
1.1 markus 917: snprintf(buf, sizeof buf, "%.50s %d %d",
1.281 djm 918: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh),
919: ssh_local_port(ssh));
1.1 markus 920: child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1.149 stevesk 921:
1.312 djm 922: laddr = get_local_ipaddr(ssh_packet_get_connection_in(ssh));
1.149 stevesk 923: snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
1.281 djm 924: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh),
925: laddr, ssh_local_port(ssh));
1.265 djm 926: free(laddr);
1.149 stevesk 927: child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
1.1 markus 928:
1.293 djm 929: if (tun_fwd_ifnames != NULL)
930: child_set_env(&env, &envsize, "SSH_TUNNEL", tun_fwd_ifnames);
1.290 djm 931: if (auth_info_file != NULL)
932: child_set_env(&env, &envsize, "SSH_USER_AUTH", auth_info_file);
1.60 markus 933: if (s->ttyfd != -1)
934: child_set_env(&env, &envsize, "SSH_TTY", s->tty);
1.34 markus 935: if (original_command)
936: child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
937: original_command);
1.1 markus 938:
939: if (debug_flag) {
940: /* dump the environment */
941: fprintf(stderr, "Environment:\n");
942: for (i = 0; env[i]; i++)
943: fprintf(stderr, " %.200s\n", env[i]);
944: }
1.127 markus 945: return env;
946: }
947:
948: /*
949: * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
950: * first in this order).
951: */
952: static void
1.294 djm 953: do_rc_files(struct ssh *ssh, Session *s, const char *shell)
1.127 markus 954: {
955: FILE *f = NULL;
1.320 dtucker 956: char *cmd = NULL, *user_rc = NULL;
1.127 markus 957: int do_xauth;
958: struct stat st;
959:
960: do_xauth =
961: s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
1.322 djm 962: xasprintf(&user_rc, "%s/%s", s->pw->pw_dir, _PATH_SSH_USER_RC);
1.127 markus 963:
1.231 djm 964: /* ignore _PATH_SSH_USER_RC for subsystems and admin forced commands */
1.232 djm 965: if (!s->is_subsystem && options.adm_forced_command == NULL &&
1.294 djm 966: auth_opts->permit_user_rc && options.permit_user_rc &&
1.320 dtucker 967: stat(user_rc, &st) >= 0) {
968: if (xasprintf(&cmd, "%s -c '%s %s'", shell, _PATH_BSHELL,
969: user_rc) == -1)
1.325 djm 970: fatal_f("xasprintf: %s", strerror(errno));
1.127 markus 971: if (debug_flag)
972: fprintf(stderr, "Running %s\n", cmd);
973: f = popen(cmd, "w");
974: if (f) {
975: if (do_xauth)
976: fprintf(f, "%s %s\n", s->auth_proto,
977: s->auth_data);
978: pclose(f);
979: } else
980: fprintf(stderr, "Could not run %s\n",
1.320 dtucker 981: user_rc);
1.127 markus 982: } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
983: if (debug_flag)
984: fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
985: _PATH_SSH_SYSTEM_RC);
986: f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
987: if (f) {
988: if (do_xauth)
989: fprintf(f, "%s %s\n", s->auth_proto,
990: s->auth_data);
991: pclose(f);
992: } else
993: fprintf(stderr, "Could not run %s\n",
994: _PATH_SSH_SYSTEM_RC);
995: } else if (do_xauth && options.xauth_location != NULL) {
996: /* Add authority data to .Xauthority if appropriate. */
997: if (debug_flag) {
998: fprintf(stderr,
1.151 stevesk 999: "Running %.500s remove %.100s\n",
1.165 markus 1000: options.xauth_location, s->auth_display);
1.151 stevesk 1001: fprintf(stderr,
1002: "%.500s add %.100s %.100s %.100s\n",
1.127 markus 1003: options.xauth_location, s->auth_display,
1004: s->auth_proto, s->auth_data);
1005: }
1.320 dtucker 1006: if (xasprintf(&cmd, "%s -q -", options.xauth_location) == -1)
1.325 djm 1007: fatal_f("xasprintf: %s", strerror(errno));
1.127 markus 1008: f = popen(cmd, "w");
1009: if (f) {
1.151 stevesk 1010: fprintf(f, "remove %s\n",
1011: s->auth_display);
1.127 markus 1012: fprintf(f, "add %s %s %s\n",
1013: s->auth_display, s->auth_proto,
1014: s->auth_data);
1015: pclose(f);
1016: } else {
1017: fprintf(stderr, "Could not run %s\n",
1018: cmd);
1019: }
1020: }
1.320 dtucker 1021: free(cmd);
1022: free(user_rc);
1.127 markus 1023: }
1024:
1025: static void
1026: do_nologin(struct passwd *pw)
1027: {
1028: FILE *f = NULL;
1.251 dtucker 1029: char buf[1024], *nl, *def_nl = _PATH_NOLOGIN;
1030: struct stat sb;
1.127 markus 1031:
1.260 guenther 1032: if (login_getcapbool(lc, "ignorenologin", 0) || pw->pw_uid == 0)
1.251 dtucker 1033: return;
1034: nl = login_getcapstr(lc, "nologin", def_nl, def_nl);
1035:
1036: if (stat(nl, &sb) == -1) {
1037: if (nl != def_nl)
1.265 djm 1038: free(nl);
1.251 dtucker 1039: return;
1040: }
1041:
1042: /* /etc/nologin exists. Print its contents if we can and exit. */
1043: logit("User %.100s not allowed because %s exists", pw->pw_name, nl);
1044: if ((f = fopen(nl, "r")) != NULL) {
1.127 markus 1045: while (fgets(buf, sizeof(buf), f))
1046: fputs(buf, stderr);
1047: fclose(f);
1048: }
1.251 dtucker 1049: exit(254);
1.127 markus 1050: }
1051:
1.226 djm 1052: /*
1053: * Chroot into a directory after checking it for safety: all path components
1054: * must be root-owned directories with strict permissions.
1055: */
1056: static void
1057: safely_chroot(const char *path, uid_t uid)
1058: {
1059: const char *cp;
1.277 deraadt 1060: char component[PATH_MAX];
1.226 djm 1061: struct stat st;
1062:
1.308 djm 1063: if (!path_absolute(path))
1.226 djm 1064: fatal("chroot path does not begin at root");
1065: if (strlen(path) >= sizeof(component))
1066: fatal("chroot path too long");
1067:
1068: /*
1069: * Descend the path, checking that each component is a
1070: * root-owned directory with strict permissions.
1071: */
1072: for (cp = path; cp != NULL;) {
1073: if ((cp = strchr(cp, '/')) == NULL)
1074: strlcpy(component, path, sizeof(component));
1075: else {
1076: cp++;
1077: memcpy(component, path, cp - path);
1078: component[cp - path] = '\0';
1079: }
1.337 djm 1080:
1.325 djm 1081: debug3_f("checking '%s'", component);
1.226 djm 1082:
1083: if (stat(component, &st) != 0)
1.325 djm 1084: fatal_f("stat(\"%s\"): %s",
1.226 djm 1085: component, strerror(errno));
1086: if (st.st_uid != 0 || (st.st_mode & 022) != 0)
1087: fatal("bad ownership or modes for chroot "
1.312 djm 1088: "directory %s\"%s\"",
1.226 djm 1089: cp == NULL ? "" : "component ", component);
1090: if (!S_ISDIR(st.st_mode))
1091: fatal("chroot path %s\"%s\" is not a directory",
1092: cp == NULL ? "" : "component ", component);
1093:
1094: }
1095:
1096: if (chdir(path) == -1)
1097: fatal("Unable to chdir to chroot path \"%s\": "
1098: "%s", path, strerror(errno));
1099: if (chroot(path) == -1)
1100: fatal("chroot(\"%s\"): %s", path, strerror(errno));
1101: if (chdir("/") == -1)
1.325 djm 1102: fatal_f("chdir(/) after chroot: %s", strerror(errno));
1.226 djm 1103: verbose("Changed root directory to \"%s\"", path);
1104: }
1105:
1.127 markus 1106: /* Set login name, uid, gid, and groups. */
1.130 provos 1107: void
1.127 markus 1108: do_setusercontext(struct passwd *pw)
1109: {
1.295 djm 1110: char uidstr[32], *chroot_path, *tmp;
1.227 djm 1111:
1.127 markus 1112: if (getuid() == 0 || geteuid() == 0) {
1.226 djm 1113: /* Prepare groups */
1.127 markus 1114: if (setusercontext(lc, pw, pw->pw_uid,
1.226 djm 1115: (LOGIN_SETALL & ~(LOGIN_SETPATH|LOGIN_SETUSER))) < 0) {
1.127 markus 1116: perror("unable to set user context");
1117: exit(1);
1118: }
1.226 djm 1119:
1.279 djm 1120: if (!in_chroot && options.chroot_directory != NULL &&
1.226 djm 1121: strcasecmp(options.chroot_directory, "none") != 0) {
1.328 djm 1122: tmp = tilde_expand_filename(options.chroot_directory,
1.227 djm 1123: pw->pw_uid);
1.295 djm 1124: snprintf(uidstr, sizeof(uidstr), "%llu",
1125: (unsigned long long)pw->pw_uid);
1.227 djm 1126: chroot_path = percent_expand(tmp, "h", pw->pw_dir,
1.295 djm 1127: "u", pw->pw_name, "U", uidstr, (char *)NULL);
1.226 djm 1128: safely_chroot(chroot_path, pw->pw_uid);
1.227 djm 1129: free(tmp);
1.226 djm 1130: free(chroot_path);
1.264 djm 1131: /* Make sure we don't attempt to chroot again */
1132: free(options.chroot_directory);
1133: options.chroot_directory = NULL;
1.279 djm 1134: in_chroot = 1;
1.226 djm 1135: }
1136:
1137: /* Set UID */
1138: if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETUSER) < 0) {
1139: perror("unable to set user context (setuser)");
1140: exit(1);
1141: }
1.264 djm 1142: } else if (options.chroot_directory != NULL &&
1143: strcasecmp(options.chroot_directory, "none") != 0) {
1144: fatal("server lacks privileges to chroot to ChrootDirectory");
1.263 dtucker 1145: }
1.264 djm 1146:
1.127 markus 1147: if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1148: fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1149: }
1150:
1.131 markus 1151: static void
1.172 markus 1152: do_pwchange(Session *s)
1153: {
1.179 dtucker 1154: fflush(NULL);
1.172 markus 1155: fprintf(stderr, "WARNING: Your password has expired.\n");
1156: if (s->ttyfd != -1) {
1.178 deraadt 1157: fprintf(stderr,
1.172 markus 1158: "You must change your password now and login again!\n");
1159: execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL);
1160: perror("passwd");
1161: } else {
1162: fprintf(stderr,
1163: "Password change required but no TTY available.\n");
1164: }
1165: exit(1);
1166: }
1167:
1168: static void
1.292 djm 1169: child_close_fds(struct ssh *ssh)
1.172 markus 1170: {
1.276 djm 1171: extern int auth_sock;
1.266 markus 1172:
1.276 djm 1173: if (auth_sock != -1) {
1174: close(auth_sock);
1175: auth_sock = -1;
1.266 markus 1176: }
1177:
1.312 djm 1178: if (ssh_packet_get_connection_in(ssh) ==
1179: ssh_packet_get_connection_out(ssh))
1180: close(ssh_packet_get_connection_in(ssh));
1.172 markus 1181: else {
1.312 djm 1182: close(ssh_packet_get_connection_in(ssh));
1183: close(ssh_packet_get_connection_out(ssh));
1.172 markus 1184: }
1185: /*
1186: * Close all descriptors related to channels. They will still remain
1187: * open in the parent.
1188: */
1189: /* XXX better use close-on-exec? -markus */
1.292 djm 1190: channel_close_all(ssh);
1.172 markus 1191:
1192: /*
1193: * Close any extra file descriptors. Note that there may still be
1194: * descriptors left by system functions. They will be closed later.
1195: */
1196: endpwent();
1.321 djm 1197:
1198: /* Stop directing logs to a high-numbered fd before we close it */
1199: log_redirect_stderr_to(NULL);
1.172 markus 1200:
1201: /*
1.188 djm 1202: * Close any extra open file descriptors so that we don't have them
1.172 markus 1203: * hanging around in clients. Note that we want to do this after
1204: * initgroups, because at least on Solaris 2.3 it leaves file
1205: * descriptors open.
1206: */
1.258 djm 1207: closefrom(STDERR_FILENO + 1);
1.172 markus 1208: }
1209:
1.127 markus 1210: /*
1211: * Performs common processing for the child, such as setting up the
1212: * environment, closing extra file descriptors, setting the user and group
1213: * ids, and executing the command or shell.
1214: */
1.225 markus 1215: #define ARGV_MAX 10
1.127 markus 1216: void
1.292 djm 1217: do_child(struct ssh *ssh, Session *s, const char *command)
1.127 markus 1218: {
1219: extern char **environ;
1.314 djm 1220: char **env, *argv[ARGV_MAX], remote_id[512];
1.284 djm 1221: const char *shell, *shell0;
1.127 markus 1222: struct passwd *pw = s->pw;
1.239 djm 1223: int r = 0;
1.127 markus 1224:
1.314 djm 1225: sshpkt_fmt_connection_id(ssh, remote_id, sizeof(remote_id));
1226:
1.127 markus 1227: /* remove hostkey from the child's memory */
1228: destroy_sensitive_data();
1.312 djm 1229: ssh_packet_clear_keys(ssh);
1.127 markus 1230:
1.172 markus 1231: /* Force a password change */
1232: if (s->authctxt->force_pwchange) {
1233: do_setusercontext(pw);
1.292 djm 1234: child_close_fds(ssh);
1.172 markus 1235: do_pwchange(s);
1236: exit(1);
1237: }
1238:
1.127 markus 1239: /*
1240: * Login(1) does this as well, and it needs uid 0 for the "-h"
1241: * switch, so we let login(1) to this for us.
1242: */
1.284 djm 1243: do_nologin(pw);
1244: do_setusercontext(pw);
1.127 markus 1245:
1246: /*
1247: * Get the shell from the password data. An empty shell field is
1248: * legal, and means /bin/sh.
1249: */
1250: shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1.152 markus 1251:
1252: /*
1253: * Make sure $SHELL points to the shell from the password file,
1254: * even if shell is overridden from login.conf
1255: */
1.292 djm 1256: env = do_setup_env(ssh, s, shell);
1.152 markus 1257:
1.127 markus 1258: shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1259:
1.1 markus 1260: /*
1261: * Close the connection descriptors; note that this is the child, and
1262: * the server will still have the socket open, and it is important
1263: * that we do not shutdown it. Note that the descriptors cannot be
1264: * closed before building the environment, as we call
1.281 djm 1265: * ssh_remote_ipaddr there.
1.1 markus 1266: */
1.292 djm 1267: child_close_fds(ssh);
1.1 markus 1268:
1269: /*
1.125 deraadt 1270: * Must take new environment into use so that .ssh/rc,
1271: * /etc/ssh/sshrc and xauth are run in the proper environment.
1.1 markus 1272: */
1273: environ = env;
1.170 jakob 1274:
1275: #ifdef KRB5
1276: /*
1277: * At this point, we check to see if AFS is active and if we have
1278: * a valid Kerberos 5 TGT. If so, it seems like a good idea to see
1279: * if we can (and need to) extend the ticket into an AFS token. If
1280: * we don't do this, we run into potential problems if the user's
1281: * home directory is in AFS and it's not world-readable.
1282: */
1283:
1284: if (options.kerberos_get_afs_token && k_hasafs() &&
1.185 djm 1285: (s->authctxt->krb5_ctx != NULL)) {
1.170 jakob 1286: char cell[64];
1287:
1288: debug("Getting AFS token");
1289:
1290: k_setpag();
1291:
1292: if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1293: krb5_afslog(s->authctxt->krb5_ctx,
1294: s->authctxt->krb5_fwd_ccache, cell, NULL);
1295:
1296: krb5_afslog_home(s->authctxt->krb5_ctx,
1297: s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir);
1298: }
1299: #endif
1.104 markus 1300:
1.188 djm 1301: /* Change current directory to the user's home directory. */
1.316 deraadt 1302: if (chdir(pw->pw_dir) == -1) {
1.239 djm 1303: /* Suppress missing homedir warning for chroot case */
1304: r = login_getcapbool(lc, "requirehome", 0);
1.279 djm 1305: if (r || !in_chroot) {
1.239 djm 1306: fprintf(stderr, "Could not chdir to home "
1307: "directory %s: %s\n", pw->pw_dir,
1308: strerror(errno));
1.279 djm 1309: }
1.239 djm 1310: if (r)
1.104 markus 1311: exit(1);
1312: }
1.230 djm 1313:
1314: closefrom(STDERR_FILENO + 1);
1.1 markus 1315:
1.294 djm 1316: do_rc_files(ssh, s, shell);
1.67 markus 1317:
1318: /* restore SIGPIPE for child */
1.318 dtucker 1319: ssh_signal(SIGPIPE, SIG_DFL);
1.67 markus 1320:
1.248 djm 1321: if (s->is_subsystem == SUBSYSTEM_INT_SFTP_ERROR) {
1.314 djm 1322: error("Connection from %s: refusing non-sftp session",
1323: remote_id);
1.248 djm 1324: printf("This service allows sftp connections only.\n");
1325: fflush(NULL);
1326: exit(1);
1327: } else if (s->is_subsystem == SUBSYSTEM_INT_SFTP) {
1.225 markus 1328: extern int optind, optreset;
1329: int i;
1330: char *p, *args;
1331:
1.246 stevesk 1332: setproctitle("%s@%s", s->pw->pw_name, INTERNAL_SFTP_NAME);
1.243 millert 1333: args = xstrdup(command ? command : "sftp-server");
1.225 markus 1334: for (i = 0, (p = strtok(args, " ")); p; (p = strtok(NULL, " ")))
1335: if (i < ARGV_MAX - 1)
1336: argv[i++] = p;
1337: argv[i] = NULL;
1338: optind = optreset = 1;
1339: __progname = argv[0];
1.226 djm 1340: exit(sftp_server_main(i, argv, s->pw));
1.225 markus 1341: }
1.247 djm 1342:
1343: fflush(NULL);
1.225 markus 1344:
1.127 markus 1345: /* Get the last component of the shell name. */
1346: if ((shell0 = strrchr(shell, '/')) != NULL)
1347: shell0++;
1348: else
1349: shell0 = shell;
1350:
1.1 markus 1351: /*
1352: * If we have no command, execute the shell. In this case, the shell
1353: * name to be passed in argv[0] is preceded by '-' to indicate that
1354: * this is a login shell.
1355: */
1356: if (!command) {
1.127 markus 1357: char argv0[256];
1.1 markus 1358:
1.127 markus 1359: /* Start the shell. Set initial character to '-'. */
1360: argv0[0] = '-';
1.1 markus 1361:
1.127 markus 1362: if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1.128 markus 1363: >= sizeof(argv0) - 1) {
1.127 markus 1364: errno = EINVAL;
1.1 markus 1365: perror(shell);
1366: exit(1);
1.127 markus 1367: }
1.1 markus 1368:
1.127 markus 1369: /* Execute the shell. */
1370: argv[0] = argv0;
1371: argv[1] = NULL;
1372: execve(shell, argv, env);
1373:
1374: /* Executing the shell failed. */
1375: perror(shell);
1376: exit(1);
1.1 markus 1377: }
1378: /*
1379: * Execute the command using the user's shell. This uses the -c
1380: * option to execute the command.
1381: */
1.127 markus 1382: argv[0] = (char *) shell0;
1.1 markus 1383: argv[1] = "-c";
1384: argv[2] = (char *) command;
1385: argv[3] = NULL;
1386: execve(shell, argv, env);
1387: perror(shell);
1388: exit(1);
1389: }
1390:
1.237 djm 1391: void
1392: session_unused(int id)
1393: {
1.325 djm 1394: debug3_f("session id %d unused", id);
1.237 djm 1395: if (id >= options.max_sessions ||
1396: id >= sessions_nalloc) {
1.325 djm 1397: fatal_f("insane session id %d (max %d nalloc %d)",
1398: id, options.max_sessions, sessions_nalloc);
1.237 djm 1399: }
1.270 tedu 1400: memset(&sessions[id], 0, sizeof(*sessions));
1.237 djm 1401: sessions[id].self = id;
1402: sessions[id].used = 0;
1403: sessions[id].chanid = -1;
1404: sessions[id].ptyfd = -1;
1405: sessions[id].ttyfd = -1;
1406: sessions[id].ptymaster = -1;
1407: sessions[id].x11_chanids = NULL;
1408: sessions[id].next_unused = sessions_first_unused;
1409: sessions_first_unused = id;
1410: }
1411:
1.1 markus 1412: Session *
1413: session_new(void)
1414: {
1.237 djm 1415: Session *s, *tmp;
1416:
1417: if (sessions_first_unused == -1) {
1418: if (sessions_nalloc >= options.max_sessions)
1419: return NULL;
1.325 djm 1420: debug2_f("allocate (allocated %d max %d)",
1421: sessions_nalloc, options.max_sessions);
1.288 deraadt 1422: tmp = xrecallocarray(sessions, sessions_nalloc,
1423: sessions_nalloc + 1, sizeof(*sessions));
1.237 djm 1424: if (tmp == NULL) {
1.325 djm 1425: error_f("cannot allocate %d sessions",
1426: sessions_nalloc + 1);
1.237 djm 1427: return NULL;
1428: }
1429: sessions = tmp;
1430: session_unused(sessions_nalloc++);
1431: }
1432:
1433: if (sessions_first_unused >= sessions_nalloc ||
1434: sessions_first_unused < 0) {
1.325 djm 1435: fatal_f("insane first_unused %d max %d nalloc %d",
1436: sessions_first_unused, options.max_sessions,
1.237 djm 1437: sessions_nalloc);
1438: }
1439:
1440: s = &sessions[sessions_first_unused];
1.325 djm 1441: if (s->used)
1442: fatal_f("session %d already used", sessions_first_unused);
1.237 djm 1443: sessions_first_unused = s->next_unused;
1444: s->used = 1;
1445: s->next_unused = -1;
1446: debug("session_new: session %d", s->self);
1447:
1448: return s;
1.1 markus 1449: }
1450:
1.94 itojun 1451: static void
1.1 markus 1452: session_dump(void)
1453: {
1454: int i;
1.237 djm 1455: for (i = 0; i < sessions_nalloc; i++) {
1.1 markus 1456: Session *s = &sessions[i];
1.237 djm 1457:
1.329 djm 1458: debug("dump: used %d next_unused %d session %d "
1.237 djm 1459: "channel %d pid %ld",
1.1 markus 1460: s->used,
1.237 djm 1461: s->next_unused,
1.1 markus 1462: s->self,
1463: s->chanid,
1.137 mpech 1464: (long)s->pid);
1.1 markus 1465: }
1466: }
1467:
1.2 markus 1468: int
1.97 markus 1469: session_open(Authctxt *authctxt, int chanid)
1.2 markus 1470: {
1471: Session *s = session_new();
1472: debug("session_open: channel %d", chanid);
1473: if (s == NULL) {
1474: error("no more sessions");
1475: return 0;
1476: }
1.97 markus 1477: s->authctxt = authctxt;
1478: s->pw = authctxt->pw;
1.167 djm 1479: if (s->pw == NULL || !authctxt->valid)
1.54 stevesk 1480: fatal("no user for session %d", s->self);
1.2 markus 1481: debug("session_open: session %d: link with channel %d", s->self, chanid);
1482: s->chanid = chanid;
1483: return 1;
1484: }
1485:
1.130 provos 1486: Session *
1487: session_by_tty(char *tty)
1488: {
1489: int i;
1.237 djm 1490: for (i = 0; i < sessions_nalloc; i++) {
1.130 provos 1491: Session *s = &sessions[i];
1492: if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1493: debug("session_by_tty: session %d tty %s", i, tty);
1494: return s;
1495: }
1496: }
1497: debug("session_by_tty: unknown tty %.100s", tty);
1498: session_dump();
1499: return NULL;
1500: }
1501:
1.94 itojun 1502: static Session *
1.2 markus 1503: session_by_channel(int id)
1504: {
1505: int i;
1.237 djm 1506: for (i = 0; i < sessions_nalloc; i++) {
1.2 markus 1507: Session *s = &sessions[i];
1508: if (s->used && s->chanid == id) {
1.237 djm 1509: debug("session_by_channel: session %d channel %d",
1510: i, id);
1.2 markus 1511: return s;
1512: }
1513: }
1514: debug("session_by_channel: unknown channel %d", id);
1515: session_dump();
1516: return NULL;
1517: }
1518:
1.94 itojun 1519: static Session *
1.184 djm 1520: session_by_x11_channel(int id)
1521: {
1522: int i, j;
1523:
1.237 djm 1524: for (i = 0; i < sessions_nalloc; i++) {
1.184 djm 1525: Session *s = &sessions[i];
1526:
1527: if (s->x11_chanids == NULL || !s->used)
1528: continue;
1529: for (j = 0; s->x11_chanids[j] != -1; j++) {
1530: if (s->x11_chanids[j] == id) {
1531: debug("session_by_x11_channel: session %d "
1532: "channel %d", s->self, id);
1533: return s;
1534: }
1535: }
1536: }
1537: debug("session_by_x11_channel: unknown channel %d", id);
1538: session_dump();
1539: return NULL;
1540: }
1541:
1542: static Session *
1.2 markus 1543: session_by_pid(pid_t pid)
1544: {
1545: int i;
1.137 mpech 1546: debug("session_by_pid: pid %ld", (long)pid);
1.237 djm 1547: for (i = 0; i < sessions_nalloc; i++) {
1.2 markus 1548: Session *s = &sessions[i];
1549: if (s->used && s->pid == pid)
1550: return s;
1551: }
1.137 mpech 1552: error("session_by_pid: unknown pid %ld", (long)pid);
1.2 markus 1553: session_dump();
1554: return NULL;
1555: }
1556:
1.94 itojun 1557: static int
1.292 djm 1558: session_window_change_req(struct ssh *ssh, Session *s)
1.2 markus 1559: {
1.312 djm 1560: int r;
1561:
1562: if ((r = sshpkt_get_u32(ssh, &s->col)) != 0 ||
1563: (r = sshpkt_get_u32(ssh, &s->row)) != 0 ||
1564: (r = sshpkt_get_u32(ssh, &s->xpixel)) != 0 ||
1565: (r = sshpkt_get_u32(ssh, &s->ypixel)) != 0 ||
1566: (r = sshpkt_get_end(ssh)) != 0)
1567: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.2 markus 1568: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1569: return 1;
1570: }
1571:
1.94 itojun 1572: static int
1.292 djm 1573: session_pty_req(struct ssh *ssh, Session *s)
1.2 markus 1574: {
1.312 djm 1575: int r;
1.132 markus 1576:
1.294 djm 1577: if (!auth_opts->permit_pty_flag || !options.permit_tty) {
1578: debug("Allocating a pty not permitted for this connection.");
1.19 markus 1579: return 0;
1.86 markus 1580: }
1581: if (s->ttyfd != -1) {
1.312 djm 1582: ssh_packet_disconnect(ssh, "Protocol error: you already have a pty.");
1.3 markus 1583: return 0;
1.86 markus 1584: }
1585:
1.312 djm 1586: if ((r = sshpkt_get_cstring(ssh, &s->term, NULL)) != 0 ||
1587: (r = sshpkt_get_u32(ssh, &s->col)) != 0 ||
1588: (r = sshpkt_get_u32(ssh, &s->row)) != 0 ||
1589: (r = sshpkt_get_u32(ssh, &s->xpixel)) != 0 ||
1590: (r = sshpkt_get_u32(ssh, &s->ypixel)) != 0)
1591: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.2 markus 1592:
1593: if (strcmp(s->term, "") == 0) {
1.265 djm 1594: free(s->term);
1.2 markus 1595: s->term = NULL;
1596: }
1.86 markus 1597:
1.2 markus 1598: /* Allocate a pty and open it. */
1.86 markus 1599: debug("Allocating pty.");
1.338 ! djm 1600: if (!mm_pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) {
1.265 djm 1601: free(s->term);
1.2 markus 1602: s->term = NULL;
1603: s->ptyfd = -1;
1604: s->ttyfd = -1;
1605: error("session_pty_req: session %d alloc failed", s->self);
1.3 markus 1606: return 0;
1.2 markus 1607: }
1608: debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1.86 markus 1609:
1.302 markus 1610: ssh_tty_parse_modes(ssh, s->ttyfd);
1.86 markus 1611:
1.312 djm 1612: if ((r = sshpkt_get_end(ssh)) != 0)
1613: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1614:
1.86 markus 1615: /* Set window size from the packet. */
1.2 markus 1616: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1617:
1.9 markus 1618: session_proctitle(s);
1.2 markus 1619: return 1;
1620: }
1621:
1.94 itojun 1622: static int
1.292 djm 1623: session_subsystem_req(struct ssh *ssh, Session *s)
1.7 markus 1624: {
1.105 markus 1625: struct stat st;
1.312 djm 1626: int r, success = 0;
1.333 djm 1627: char *prog, *cmd, *type;
1.182 djm 1628: u_int i;
1.7 markus 1629:
1.312 djm 1630: if ((r = sshpkt_get_cstring(ssh, &s->subsys, NULL)) != 0 ||
1631: (r = sshpkt_get_end(ssh)) != 0)
1632: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.267 djm 1633: debug2("subsystem request for %.100s by user %s", s->subsys,
1.255 djm 1634: s->pw->pw_name);
1.18 jakob 1635:
1636: for (i = 0; i < options.num_subsystems; i++) {
1.267 djm 1637: if (strcmp(s->subsys, options.subsystem_name[i]) == 0) {
1.205 djm 1638: prog = options.subsystem_command[i];
1639: cmd = options.subsystem_args[i];
1.249 dtucker 1640: if (strcmp(INTERNAL_SFTP_NAME, prog) == 0) {
1.225 markus 1641: s->is_subsystem = SUBSYSTEM_INT_SFTP;
1.249 dtucker 1642: debug("subsystem: %s", prog);
1.225 markus 1643: } else {
1.316 deraadt 1644: if (stat(prog, &st) == -1)
1.249 dtucker 1645: debug("subsystem: cannot stat %s: %s",
1646: prog, strerror(errno));
1.225 markus 1647: s->is_subsystem = SUBSYSTEM_EXT;
1.249 dtucker 1648: debug("subsystem: exec() %s", cmd);
1.105 markus 1649: }
1.333 djm 1650: xasprintf(&type, "session:subsystem:%s",
1651: options.subsystem_name[i]);
1652: channel_set_xtype(ssh, s->chanid, type);
1653: free(type);
1.292 djm 1654: success = do_exec(ssh, s, cmd) == 0;
1.122 markus 1655: break;
1.18 jakob 1656: }
1657: }
1658:
1659: if (!success)
1.267 djm 1660: logit("subsystem request for %.100s by user %s failed, "
1661: "subsystem not found", s->subsys, s->pw->pw_name);
1.7 markus 1662:
1663: return success;
1664: }
1665:
1.94 itojun 1666: static int
1.292 djm 1667: session_x11_req(struct ssh *ssh, Session *s)
1.7 markus 1668: {
1.312 djm 1669: int r, success;
1670: u_char single_connection = 0;
1.7 markus 1671:
1.184 djm 1672: if (s->auth_proto != NULL || s->auth_data != NULL) {
1673: error("session_x11_req: session %d: "
1.190 stevesk 1674: "x11 forwarding already active", s->self);
1.184 djm 1675: return 0;
1676: }
1.312 djm 1677: if ((r = sshpkt_get_u8(ssh, &single_connection)) != 0 ||
1678: (r = sshpkt_get_cstring(ssh, &s->auth_proto, NULL)) != 0 ||
1679: (r = sshpkt_get_cstring(ssh, &s->auth_data, NULL)) != 0 ||
1680: (r = sshpkt_get_u32(ssh, &s->screen)) != 0 ||
1681: (r = sshpkt_get_end(ssh)) != 0)
1682: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1683:
1684: s->single_connection = single_connection;
1.7 markus 1685:
1.282 djm 1686: if (xauth_valid_string(s->auth_proto) &&
1687: xauth_valid_string(s->auth_data))
1.292 djm 1688: success = session_setup_x11fwd(ssh, s);
1.282 djm 1689: else {
1690: success = 0;
1691: error("Invalid X11 forwarding data");
1692: }
1.81 markus 1693: if (!success) {
1.265 djm 1694: free(s->auth_proto);
1695: free(s->auth_data);
1.84 markus 1696: s->auth_proto = NULL;
1697: s->auth_data = NULL;
1.7 markus 1698: }
1.81 markus 1699: return success;
1.7 markus 1700: }
1701:
1.94 itojun 1702: static int
1.292 djm 1703: session_shell_req(struct ssh *ssh, Session *s)
1.19 markus 1704: {
1.312 djm 1705: int r;
1706:
1707: if ((r = sshpkt_get_end(ssh)) != 0)
1708: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.333 djm 1709:
1710: channel_set_xtype(ssh, s->chanid, "session:shell");
1711:
1.292 djm 1712: return do_exec(ssh, s, NULL) == 0;
1.19 markus 1713: }
1714:
1.94 itojun 1715: static int
1.292 djm 1716: session_exec_req(struct ssh *ssh, Session *s)
1.19 markus 1717: {
1.312 djm 1718: u_int success;
1719: int r;
1720: char *command = NULL;
1721:
1722: if ((r = sshpkt_get_cstring(ssh, &command, NULL)) != 0 ||
1723: (r = sshpkt_get_end(ssh)) != 0)
1724: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.333 djm 1725:
1726: channel_set_xtype(ssh, s->chanid, "session:command");
1.237 djm 1727:
1.292 djm 1728: success = do_exec(ssh, s, command) == 0;
1.265 djm 1729: free(command);
1.237 djm 1730: return success;
1.19 markus 1731: }
1732:
1.94 itojun 1733: static int
1.292 djm 1734: session_break_req(struct ssh *ssh, Session *s)
1.157 markus 1735: {
1.312 djm 1736: int r;
1.157 markus 1737:
1.312 djm 1738: if ((r = sshpkt_get_u32(ssh, NULL)) != 0 || /* ignore */
1739: (r = sshpkt_get_end(ssh)) != 0)
1740: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.157 markus 1741:
1.316 deraadt 1742: if (s->ptymaster == -1 || tcsendbreak(s->ptymaster, 0) == -1)
1.157 markus 1743: return 0;
1744: return 1;
1745: }
1746:
1747: static int
1.292 djm 1748: session_env_req(struct ssh *ssh, Session *s)
1.173 djm 1749: {
1750: char *name, *val;
1.312 djm 1751: u_int i;
1752: int r;
1.173 djm 1753:
1.312 djm 1754: if ((r = sshpkt_get_cstring(ssh, &name, NULL)) != 0 ||
1755: (r = sshpkt_get_cstring(ssh, &val, NULL)) != 0 ||
1756: (r = sshpkt_get_end(ssh)) != 0)
1757: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.173 djm 1758:
1759: /* Don't set too many environment variables */
1760: if (s->num_env > 128) {
1761: debug2("Ignoring env request %s: too many env vars", name);
1762: goto fail;
1763: }
1764:
1765: for (i = 0; i < options.num_accept_env; i++) {
1766: if (match_pattern(name, options.accept_env[i])) {
1767: debug2("Setting env %d: %s=%s", s->num_env, name, val);
1.288 deraadt 1768: s->env = xrecallocarray(s->env, s->num_env,
1769: s->num_env + 1, sizeof(*s->env));
1.173 djm 1770: s->env[s->num_env].name = name;
1771: s->env[s->num_env].val = val;
1772: s->num_env++;
1773: return (1);
1774: }
1775: }
1776: debug2("Ignoring env request %s: disallowed name", name);
1777:
1778: fail:
1.265 djm 1779: free(name);
1780: free(val);
1.173 djm 1781: return (0);
1782: }
1783:
1.306 djm 1784: /*
1785: * Conversion of signals from ssh channel request names.
1786: * Subset of signals from RFC 4254 section 6.10C, with SIGINFO as
1787: * local extension.
1788: */
1789: static int
1790: name2sig(char *name)
1791: {
1792: #define SSH_SIG(x) if (strcmp(name, #x) == 0) return SIG ## x
1793: SSH_SIG(HUP);
1794: SSH_SIG(INT);
1795: SSH_SIG(KILL);
1796: SSH_SIG(QUIT);
1797: SSH_SIG(TERM);
1798: SSH_SIG(USR1);
1799: SSH_SIG(USR2);
1800: #undef SSH_SIG
1801: if (strcmp(name, "INFO@openssh.com") == 0)
1802: return SIGINFO;
1803: return -1;
1804: }
1805:
1806: static int
1807: session_signal_req(struct ssh *ssh, Session *s)
1808: {
1809: char *signame = NULL;
1810: int r, sig, success = 0;
1811:
1812: if ((r = sshpkt_get_cstring(ssh, &signame, NULL)) != 0 ||
1813: (r = sshpkt_get_end(ssh)) != 0) {
1.325 djm 1814: error_fr(r, "parse");
1.306 djm 1815: goto out;
1816: }
1817: if ((sig = name2sig(signame)) == -1) {
1.325 djm 1818: error_f("unsupported signal \"%s\"", signame);
1.306 djm 1819: goto out;
1820: }
1821: if (s->pid <= 0) {
1.325 djm 1822: error_f("no pid for session %d", s->self);
1.306 djm 1823: goto out;
1824: }
1825: if (s->forced || s->is_subsystem) {
1.325 djm 1826: error_f("refusing to send signal %s to %s session",
1.306 djm 1827: signame, s->forced ? "forced-command" : "subsystem");
1828: goto out;
1829: }
1.338 ! djm 1830: if (mm_is_monitor()) {
1.325 djm 1831: error_f("session signalling requires privilege separation");
1.306 djm 1832: goto out;
1833: }
1834:
1.325 djm 1835: debug_f("signal %s, killpg(%ld, %d)", signame, (long)s->pid, sig);
1.306 djm 1836: temporarily_use_uid(s->pw);
1837: r = killpg(s->pid, sig);
1838: restore_uid();
1839: if (r != 0) {
1.325 djm 1840: error_f("killpg(%ld, %d): %s", (long)s->pid,
1.306 djm 1841: sig, strerror(errno));
1842: goto out;
1843: }
1844:
1845: /* success */
1846: success = 1;
1847: out:
1848: free(signame);
1849: return success;
1850: }
1851:
1.173 djm 1852: static int
1.292 djm 1853: session_auth_agent_req(struct ssh *ssh, Session *s)
1.43 markus 1854: {
1855: static int called = 0;
1.312 djm 1856: int r;
1.294 djm 1857:
1.312 djm 1858: if ((r = sshpkt_get_end(ssh)) != 0)
1859: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.294 djm 1860: if (!auth_opts->permit_agent_forwarding_flag ||
1861: !options.allow_agent_forwarding) {
1.325 djm 1862: debug_f("agent forwarding disabled");
1.44 markus 1863: return 0;
1864: }
1.43 markus 1865: if (called) {
1866: return 0;
1867: } else {
1868: called = 1;
1.292 djm 1869: return auth_input_request_forwarding(ssh, s->pw);
1.43 markus 1870: }
1871: }
1872:
1.123 markus 1873: int
1.292 djm 1874: session_input_channel_req(struct ssh *ssh, Channel *c, const char *rtype)
1.2 markus 1875: {
1876: int success = 0;
1877: Session *s;
1878:
1.123 markus 1879: if ((s = session_by_channel(c->self)) == NULL) {
1.325 djm 1880: logit_f("no session %d req %.100s", c->self, rtype);
1.123 markus 1881: return 0;
1882: }
1.325 djm 1883: debug_f("session %d req %s", s->self, rtype);
1.2 markus 1884:
1885: /*
1.64 markus 1886: * a session is in LARVAL state until a shell, a command
1887: * or a subsystem is executed
1.2 markus 1888: */
1889: if (c->type == SSH_CHANNEL_LARVAL) {
1890: if (strcmp(rtype, "shell") == 0) {
1.292 djm 1891: success = session_shell_req(ssh, s);
1.2 markus 1892: } else if (strcmp(rtype, "exec") == 0) {
1.292 djm 1893: success = session_exec_req(ssh, s);
1.2 markus 1894: } else if (strcmp(rtype, "pty-req") == 0) {
1.292 djm 1895: success = session_pty_req(ssh, s);
1.7 markus 1896: } else if (strcmp(rtype, "x11-req") == 0) {
1.292 djm 1897: success = session_x11_req(ssh, s);
1.43 markus 1898: } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1.292 djm 1899: success = session_auth_agent_req(ssh, s);
1.7 markus 1900: } else if (strcmp(rtype, "subsystem") == 0) {
1.292 djm 1901: success = session_subsystem_req(ssh, s);
1.173 djm 1902: } else if (strcmp(rtype, "env") == 0) {
1.292 djm 1903: success = session_env_req(ssh, s);
1.2 markus 1904: }
1905: }
1906: if (strcmp(rtype, "window-change") == 0) {
1.292 djm 1907: success = session_window_change_req(ssh, s);
1.177 djm 1908: } else if (strcmp(rtype, "break") == 0) {
1.292 djm 1909: success = session_break_req(ssh, s);
1.306 djm 1910: } else if (strcmp(rtype, "signal") == 0) {
1911: success = session_signal_req(ssh, s);
1.2 markus 1912: }
1.177 djm 1913:
1.123 markus 1914: return success;
1.2 markus 1915: }
1916:
1917: void
1.292 djm 1918: session_set_fds(struct ssh *ssh, Session *s,
1919: int fdin, int fdout, int fderr, int ignore_fderr, int is_tty)
1.2 markus 1920: {
1921: /*
1922: * now that have a child and a pipe to the child,
1923: * we can activate our channel and register the fd's
1924: */
1925: if (s->chanid == -1)
1926: fatal("no channel for session %d", s->self);
1.292 djm 1927: channel_set_fds(ssh, s->chanid,
1.2 markus 1928: fdout, fdin, fderr,
1.256 djm 1929: ignore_fderr ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1.241 dtucker 1930: 1, is_tty, CHAN_SES_WINDOW_DEFAULT);
1.2 markus 1931: }
1932:
1.85 markus 1933: /*
1934: * Function to perform pty cleanup. Also called if we get aborted abnormally
1935: * (e.g., due to a dropped connection).
1936: */
1.130 provos 1937: void
1.165 markus 1938: session_pty_cleanup2(Session *s)
1.1 markus 1939: {
1.85 markus 1940: if (s == NULL) {
1.325 djm 1941: error_f("no session");
1.85 markus 1942: return;
1943: }
1944: if (s->ttyfd == -1)
1.1 markus 1945: return;
1946:
1.325 djm 1947: debug_f("session %d release %s", s->self, s->tty);
1.1 markus 1948:
1949: /* Record that the user has logged out. */
1.85 markus 1950: if (s->pid != 0)
1951: record_logout(s->pid, s->tty);
1.1 markus 1952:
1953: /* Release the pseudo-tty. */
1.130 provos 1954: if (getuid() == 0)
1955: pty_release(s->tty);
1.1 markus 1956:
1957: /*
1958: * Close the server side of the socket pairs. We must do this after
1959: * the pty cleanup, so that another process doesn't get this pty
1960: * while we're still cleaning up.
1961: */
1.316 deraadt 1962: if (s->ptymaster != -1 && close(s->ptymaster) == -1)
1.237 djm 1963: error("close(s->ptymaster/%d): %s",
1964: s->ptymaster, strerror(errno));
1.108 markus 1965:
1966: /* unlink pty from session */
1967: s->ttyfd = -1;
1.2 markus 1968: }
1969:
1.130 provos 1970: void
1.165 markus 1971: session_pty_cleanup(Session *s)
1.130 provos 1972: {
1.338 ! djm 1973: mm_session_pty_cleanup2(s);
1.130 provos 1974: }
1975:
1.147 markus 1976: static char *
1977: sig2name(int sig)
1978: {
1979: #define SSH_SIG(x) if (sig == SIG ## x) return #x
1980: SSH_SIG(ABRT);
1981: SSH_SIG(ALRM);
1982: SSH_SIG(FPE);
1983: SSH_SIG(HUP);
1984: SSH_SIG(ILL);
1985: SSH_SIG(INT);
1986: SSH_SIG(KILL);
1987: SSH_SIG(PIPE);
1988: SSH_SIG(QUIT);
1989: SSH_SIG(SEGV);
1990: SSH_SIG(TERM);
1991: SSH_SIG(USR1);
1992: SSH_SIG(USR2);
1993: #undef SSH_SIG
1994: return "SIG@openssh.com";
1995: }
1996:
1.94 itojun 1997: static void
1.292 djm 1998: session_close_x11(struct ssh *ssh, int id)
1.184 djm 1999: {
2000: Channel *c;
2001:
1.292 djm 2002: if ((c = channel_by_id(ssh, id)) == NULL) {
1.325 djm 2003: debug_f("x11 channel %d missing", id);
1.184 djm 2004: } else {
2005: /* Detach X11 listener */
1.325 djm 2006: debug_f("detach x11 channel %d", id);
1.292 djm 2007: channel_cancel_cleanup(ssh, id);
1.184 djm 2008: if (c->ostate != CHAN_OUTPUT_CLOSED)
1.292 djm 2009: chan_mark_dead(ssh, c);
1.184 djm 2010: }
2011: }
2012:
2013: static void
1.331 djm 2014: session_close_single_x11(struct ssh *ssh, int id, int force, void *arg)
1.184 djm 2015: {
2016: Session *s;
2017: u_int i;
2018:
1.325 djm 2019: debug3_f("channel %d", id);
1.292 djm 2020: channel_cancel_cleanup(ssh, id);
1.221 stevesk 2021: if ((s = session_by_x11_channel(id)) == NULL)
1.325 djm 2022: fatal_f("no x11 channel %d", id);
1.184 djm 2023: for (i = 0; s->x11_chanids[i] != -1; i++) {
1.325 djm 2024: debug_f("session %d: closing channel %d",
2025: s->self, s->x11_chanids[i]);
1.184 djm 2026: /*
2027: * The channel "id" is already closing, but make sure we
2028: * close all of its siblings.
2029: */
2030: if (s->x11_chanids[i] != id)
1.292 djm 2031: session_close_x11(ssh, s->x11_chanids[i]);
1.184 djm 2032: }
1.265 djm 2033: free(s->x11_chanids);
1.184 djm 2034: s->x11_chanids = NULL;
1.265 djm 2035: free(s->display);
2036: s->display = NULL;
2037: free(s->auth_proto);
2038: s->auth_proto = NULL;
2039: free(s->auth_data);
2040: s->auth_data = NULL;
2041: free(s->auth_display);
2042: s->auth_display = NULL;
1.184 djm 2043: }
2044:
2045: static void
1.292 djm 2046: session_exit_message(struct ssh *ssh, Session *s, int status)
1.2 markus 2047: {
2048: Channel *c;
1.312 djm 2049: int r;
1.336 djm 2050: char *note = NULL;
1.124 markus 2051:
1.292 djm 2052: if ((c = channel_lookup(ssh, s->chanid)) == NULL)
1.325 djm 2053: fatal_f("session %d: no channel %d", s->self, s->chanid);
1.2 markus 2054:
2055: if (WIFEXITED(status)) {
1.292 djm 2056: channel_request_start(ssh, s->chanid, "exit-status", 0);
1.312 djm 2057: if ((r = sshpkt_put_u32(ssh, WEXITSTATUS(status))) != 0 ||
2058: (r = sshpkt_send(ssh)) != 0)
2059: sshpkt_fatal(ssh, r, "%s: exit reply", __func__);
1.336 djm 2060: xasprintf(¬e, "exit %d", WEXITSTATUS(status));
1.2 markus 2061: } else if (WIFSIGNALED(status)) {
1.292 djm 2062: channel_request_start(ssh, s->chanid, "exit-signal", 0);
1.312 djm 2063: if ((r = sshpkt_put_cstring(ssh, sig2name(WTERMSIG(status)))) != 0 ||
2064: (r = sshpkt_put_u8(ssh, WCOREDUMP(status)? 1 : 0)) != 0 ||
2065: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
2066: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
2067: (r = sshpkt_send(ssh)) != 0)
2068: sshpkt_fatal(ssh, r, "%s: exit reply", __func__);
1.336 djm 2069: xasprintf(¬e, "signal %d%s", WTERMSIG(status),
2070: WCOREDUMP(status) ? " core dumped" : "");
1.2 markus 2071: } else {
2072: /* Some weird exit cause. Just exit. */
1.336 djm 2073: ssh_packet_disconnect(ssh, "wait returned status %04x.",
2074: status);
1.2 markus 2075: }
1.336 djm 2076:
2077: debug_f("session %d channel %d pid %ld %s", s->self, s->chanid,
2078: (long)s->pid, note == NULL ? "UNKNOWN" : note);
2079: free(note);
1.2 markus 2080:
2081: /* disconnect channel */
1.325 djm 2082: debug_f("release channel %d", s->chanid);
1.187 djm 2083:
2084: /*
2085: * Adjust cleanup callback attachment to send close messages when
1.199 deraadt 2086: * the channel gets EOF. The session will be then be closed
1.319 djm 2087: * by session_close_by_channel when the child sessions close their fds.
1.187 djm 2088: */
1.292 djm 2089: channel_register_cleanup(ssh, c->self, session_close_by_channel, 1);
1.187 djm 2090:
1.5 markus 2091: /*
2092: * emulate a write failure with 'chan_write_failed', nobody will be
2093: * interested in data we write.
2094: * Note that we must not call 'chan_read_failed', since there could
2095: * be some more data waiting in the pipe.
2096: */
1.8 markus 2097: if (c->ostate != CHAN_OUTPUT_CLOSED)
1.292 djm 2098: chan_write_failed(ssh, c);
1.2 markus 2099: }
2100:
1.130 provos 2101: void
1.292 djm 2102: session_close(struct ssh *ssh, Session *s)
1.2 markus 2103: {
1.182 djm 2104: u_int i;
1.173 djm 2105:
1.280 djm 2106: verbose("Close session: user %s from %.200s port %d id %d",
2107: s->pw->pw_name,
1.281 djm 2108: ssh_remote_ipaddr(ssh),
2109: ssh_remote_port(ssh),
1.280 djm 2110: s->self);
2111:
1.165 markus 2112: if (s->ttyfd != -1)
1.85 markus 2113: session_pty_cleanup(s);
1.265 djm 2114: free(s->term);
2115: free(s->display);
2116: free(s->x11_chanids);
2117: free(s->auth_display);
2118: free(s->auth_data);
2119: free(s->auth_proto);
1.267 djm 2120: free(s->subsys);
1.219 djm 2121: if (s->env != NULL) {
2122: for (i = 0; i < s->num_env; i++) {
1.265 djm 2123: free(s->env[i].name);
2124: free(s->env[i].val);
1.219 djm 2125: }
1.265 djm 2126: free(s->env);
1.173 djm 2127: }
1.9 markus 2128: session_proctitle(s);
1.237 djm 2129: session_unused(s->self);
1.2 markus 2130: }
2131:
2132: void
1.292 djm 2133: session_close_by_pid(struct ssh *ssh, pid_t pid, int status)
1.2 markus 2134: {
2135: Session *s = session_by_pid(pid);
2136: if (s == NULL) {
1.325 djm 2137: debug_f("no session for pid %ld", (long)pid);
1.2 markus 2138: return;
2139: }
2140: if (s->chanid != -1)
1.292 djm 2141: session_exit_message(ssh, s, status);
1.187 djm 2142: if (s->ttyfd != -1)
2143: session_pty_cleanup(s);
1.197 djm 2144: s->pid = 0;
1.98 markus 2145: }
2146:
1.2 markus 2147: /*
2148: * this is called when a channel dies before
2149: * the session 'child' itself dies
2150: */
2151: void
1.331 djm 2152: session_close_by_channel(struct ssh *ssh, int id, int force, void *arg)
1.2 markus 2153: {
2154: Session *s = session_by_channel(id);
1.187 djm 2155: u_int i;
1.184 djm 2156:
1.2 markus 2157: if (s == NULL) {
1.325 djm 2158: debug_f("no session for id %d", id);
1.2 markus 2159: return;
2160: }
1.325 djm 2161: debug_f("channel %d child %ld", id, (long)s->pid);
1.107 markus 2162: if (s->pid != 0) {
1.325 djm 2163: debug_f("channel %d: has child, ttyfd %d", id, s->ttyfd);
1.108 markus 2164: /*
1.331 djm 2165: * delay detach of session (unless this is a forced close),
2166: * but release pty, since the fd's to the child are already
2167: * closed
1.108 markus 2168: */
1.165 markus 2169: if (s->ttyfd != -1)
1.108 markus 2170: session_pty_cleanup(s);
1.331 djm 2171: if (!force)
2172: return;
1.107 markus 2173: }
2174: /* detach by removing callback */
1.292 djm 2175: channel_cancel_cleanup(ssh, s->chanid);
1.187 djm 2176:
2177: /* Close any X11 listeners associated with this session */
2178: if (s->x11_chanids != NULL) {
2179: for (i = 0; s->x11_chanids[i] != -1; i++) {
1.292 djm 2180: session_close_x11(ssh, s->x11_chanids[i]);
1.187 djm 2181: s->x11_chanids[i] = -1;
2182: }
2183: }
2184:
1.2 markus 2185: s->chanid = -1;
1.292 djm 2186: session_close(ssh, s);
1.106 markus 2187: }
2188:
2189: void
1.292 djm 2190: session_destroy_all(struct ssh *ssh, void (*closefunc)(Session *))
1.106 markus 2191: {
2192: int i;
1.237 djm 2193: for (i = 0; i < sessions_nalloc; i++) {
1.106 markus 2194: Session *s = &sessions[i];
1.130 provos 2195: if (s->used) {
2196: if (closefunc != NULL)
2197: closefunc(s);
2198: else
1.292 djm 2199: session_close(ssh, s);
1.130 provos 2200: }
1.2 markus 2201: }
1.9 markus 2202: }
2203:
1.94 itojun 2204: static char *
1.9 markus 2205: session_tty_list(void)
2206: {
2207: static char buf[1024];
2208: int i;
2209: buf[0] = '\0';
1.237 djm 2210: for (i = 0; i < sessions_nalloc; i++) {
1.9 markus 2211: Session *s = &sessions[i];
2212: if (s->used && s->ttyfd != -1) {
2213: if (buf[0] != '\0')
2214: strlcat(buf, ",", sizeof buf);
2215: strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
2216: }
2217: }
2218: if (buf[0] == '\0')
2219: strlcpy(buf, "notty", sizeof buf);
2220: return buf;
2221: }
2222:
2223: void
2224: session_proctitle(Session *s)
2225: {
2226: if (s->pw == NULL)
2227: error("no user for session %d", s->self);
2228: else
2229: setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1.81 markus 2230: }
2231:
2232: int
1.292 djm 2233: session_setup_x11fwd(struct ssh *ssh, Session *s)
1.81 markus 2234: {
2235: struct stat st;
1.109 stevesk 2236: char display[512], auth_display[512];
1.272 djm 2237: char hostname[NI_MAXHOST];
1.184 djm 2238: u_int i;
1.81 markus 2239:
1.294 djm 2240: if (!auth_opts->permit_x11_forwarding_flag) {
1.312 djm 2241: ssh_packet_send_debug(ssh, "X11 forwarding disabled by key options.");
1.81 markus 2242: return 0;
2243: }
2244: if (!options.x11_forwarding) {
2245: debug("X11 forwarding disabled in server configuration file.");
2246: return 0;
2247: }
1.275 djm 2248: if (options.xauth_location == NULL ||
1.81 markus 2249: (stat(options.xauth_location, &st) == -1)) {
1.312 djm 2250: ssh_packet_send_debug(ssh, "No xauth program; cannot forward X11.");
1.81 markus 2251: return 0;
2252: }
1.87 markus 2253: if (s->display != NULL) {
1.81 markus 2254: debug("X11 display already set.");
2255: return 0;
2256: }
1.292 djm 2257: if (x11_create_display_inet(ssh, options.x11_display_offset,
1.140 deraadt 2258: options.x11_use_localhost, s->single_connection,
1.184 djm 2259: &s->display_number, &s->x11_chanids) == -1) {
1.87 markus 2260: debug("x11_create_display_inet failed.");
1.81 markus 2261: return 0;
1.184 djm 2262: }
2263: for (i = 0; s->x11_chanids[i] != -1; i++) {
1.292 djm 2264: channel_register_cleanup(ssh, s->x11_chanids[i],
1.187 djm 2265: session_close_single_x11, 0);
1.81 markus 2266: }
1.109 stevesk 2267:
2268: /* Set up a suitable value for the DISPLAY variable. */
1.316 deraadt 2269: if (gethostname(hostname, sizeof(hostname)) == -1)
1.109 stevesk 2270: fatal("gethostname: %.100s", strerror(errno));
2271: /*
2272: * auth_display must be used as the displayname when the
2273: * authorization entry is added with xauth(1). This will be
2274: * different than the DISPLAY string for localhost displays.
2275: */
1.119 stevesk 2276: if (options.x11_use_localhost) {
1.140 deraadt 2277: snprintf(display, sizeof display, "localhost:%u.%u",
1.109 stevesk 2278: s->display_number, s->screen);
1.140 deraadt 2279: snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
1.118 stevesk 2280: s->display_number, s->screen);
1.109 stevesk 2281: s->display = xstrdup(display);
1.118 stevesk 2282: s->auth_display = xstrdup(auth_display);
1.109 stevesk 2283: } else {
1.140 deraadt 2284: snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
1.109 stevesk 2285: s->display_number, s->screen);
2286: s->display = xstrdup(display);
1.118 stevesk 2287: s->auth_display = xstrdup(display);
1.109 stevesk 2288: }
2289:
1.81 markus 2290: return 1;
1.2 markus 2291: }
2292:
1.94 itojun 2293: static void
1.292 djm 2294: do_authenticated2(struct ssh *ssh, Authctxt *authctxt)
1.2 markus 2295: {
1.292 djm 2296: server_loop2(ssh, authctxt);
1.165 markus 2297: }
2298:
2299: void
1.292 djm 2300: do_cleanup(struct ssh *ssh, Authctxt *authctxt)
1.165 markus 2301: {
2302: static int called = 0;
2303:
2304: debug("do_cleanup");
2305:
2306: /* no cleanup if we're in the child for login shell */
2307: if (is_child)
2308: return;
2309:
2310: /* avoid double cleanup */
2311: if (called)
2312: return;
2313: called = 1;
2314:
1.218 markus 2315: if (authctxt == NULL || !authctxt->authenticated)
1.165 markus 2316: return;
2317: #ifdef KRB5
2318: if (options.kerberos_ticket_cleanup &&
2319: authctxt->krb5_ctx)
2320: krb5_cleanup_proc(authctxt);
1.161 markus 2321: #endif
1.165 markus 2322:
2323: #ifdef GSSAPI
1.283 markus 2324: if (options.gss_cleanup_creds)
1.165 markus 2325: ssh_gssapi_cleanup_creds();
2326: #endif
2327:
2328: /* remove agent socket */
2329: auth_sock_cleanup_proc(authctxt->pw);
1.290 djm 2330:
2331: /* remove userauth info */
2332: if (auth_info_file != NULL) {
2333: temporarily_use_uid(authctxt->pw);
2334: unlink(auth_info_file);
2335: restore_uid();
2336: free(auth_info_file);
2337: auth_info_file = NULL;
2338: }
1.165 markus 2339:
2340: /*
2341: * Cleanup ptys/utmp only if privsep is disabled,
2342: * or if running in monitor.
2343: */
1.338 ! djm 2344: if (mm_is_monitor())
1.292 djm 2345: session_destroy_all(ssh, session_pty_cleanup2);
1.1 markus 2346: }
1.281 djm 2347:
2348: /* Return a name for the remote host that fits inside utmp_size */
2349:
2350: const char *
2351: session_get_remote_name_or_ip(struct ssh *ssh, u_int utmp_size, int use_dns)
2352: {
2353: const char *remote = "";
2354:
2355: if (utmp_size > 0)
2356: remote = auth_get_canonical_hostname(ssh, use_dns);
2357: if (utmp_size == 0 || strlen(remote) > utmp_size)
2358: remote = ssh_remote_ipaddr(ssh);
2359: return remote;
2360: }
2361:
![[BACK]](/icons/back.gif){kind=icon}
Return to session.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh