Annotation of src/usr.bin/ssh/sshconnect.c, Revision 1.207
1.207 ! dtucker 1: /* $OpenBSD: sshconnect.c,v 1.206 2008/06/12 00:13:55 grunk Exp $ */
1.1 deraadt 2: /*
1.39 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * Code to connect to a remote host, and to perform the client side of the
7: * login (authentication) dialog.
1.78 deraadt 8: *
9: * As far as I am concerned, the code I have written for this software
10: * can be used freely for any purpose. Any derived versions of this
11: * software must be clearly marked as such, and if the derived work is
12: * incompatible with the protocol description in the RFC file, it must be
13: * called by a name other than "ssh" or "Secure Shell".
1.39 deraadt 14: */
1.1 deraadt 15:
1.174 stevesk 16: #include <sys/types.h>
17: #include <sys/wait.h>
1.175 stevesk 18: #include <sys/stat.h>
1.187 stevesk 19: #include <sys/socket.h>
1.195 stevesk 20: #include <sys/time.h>
1.187 stevesk 21:
22: #include <netinet/in.h>
1.172 stevesk 23:
1.176 stevesk 24: #include <ctype.h>
1.190 stevesk 25: #include <errno.h>
1.191 stevesk 26: #include <netdb.h>
1.172 stevesk 27: #include <paths.h>
1.199 deraadt 28: #include <signal.h>
1.188 stevesk 29: #include <pwd.h>
1.198 stevesk 30: #include <stdio.h>
1.196 stevesk 31: #include <stdlib.h>
1.193 stevesk 32: #include <string.h>
1.192 stevesk 33: #include <unistd.h>
1.71 markus 34:
1.199 deraadt 35: #include "xmalloc.h"
1.91 markus 36: #include "ssh.h"
1.1 deraadt 37: #include "rsa.h"
1.59 markus 38: #include "buffer.h"
1.1 deraadt 39: #include "packet.h"
40: #include "uidswap.h"
1.21 markus 41: #include "compat.h"
1.58 markus 42: #include "key.h"
1.71 markus 43: #include "sshconnect.h"
1.58 markus 44: #include "hostfile.h"
1.91 markus 45: #include "log.h"
46: #include "readconf.h"
47: #include "atomicio.h"
48: #include "misc.h"
1.140 jakob 49: #include "dns.h"
1.186 stevesk 50: #include "version.h"
1.140 jakob 51:
1.70 markus 52: char *client_version_string = NULL;
53: char *server_version_string = NULL;
1.59 markus 54:
1.169 stevesk 55: static int matching_host_key_dns = 0;
1.145 jakob 56:
1.124 markus 57: /* import */
1.43 markus 58: extern Options options;
1.50 markus 59: extern char *__progname;
1.124 markus 60: extern uid_t original_real_uid;
61: extern uid_t original_effective_uid;
1.135 djm 62: extern pid_t proxy_command_pid;
1.91 markus 63:
1.132 markus 64: static int show_other_keys(const char *, Key *);
1.150 jakob 65: static void warn_changed_key(Key *);
1.132 markus 66:
1.39 deraadt 67: /*
68: * Connect to the given ssh server using a proxy command.
69: */
1.109 itojun 70: static int
1.124 markus 71: ssh_proxy_connect(const char *host, u_short port, const char *proxy_command)
1.1 deraadt 72: {
1.164 djm 73: char *command_string, *tmp;
1.38 markus 74: int pin[2], pout[2];
1.69 deraadt 75: pid_t pid;
1.201 djm 76: char *shell, strport[NI_MAXSERV];
77:
78: if ((shell = getenv("SHELL")) == NULL)
79: shell = _PATH_BSHELL;
1.38 markus 80:
81: /* Convert the port number into a string. */
1.49 markus 82: snprintf(strport, sizeof strport, "%hu", port);
1.38 markus 83:
1.135 djm 84: /*
85: * Build the final command string in the buffer by making the
86: * appropriate substitutions to the given proxy command.
87: *
1.154 djm 88: * Use "exec" to avoid "sh -c" processes on some platforms
1.135 djm 89: * (e.g. Solaris)
90: */
1.179 djm 91: xasprintf(&tmp, "exec %s", proxy_command);
1.164 djm 92: command_string = percent_expand(tmp, "h", host,
93: "p", strport, (char *)NULL);
94: xfree(tmp);
1.38 markus 95:
96: /* Create pipes for communicating with the proxy. */
97: if (pipe(pin) < 0 || pipe(pout) < 0)
98: fatal("Could not create pipes to communicate with the proxy: %.100s",
1.118 deraadt 99: strerror(errno));
1.38 markus 100:
101: debug("Executing proxy command: %.500s", command_string);
102:
103: /* Fork and execute the proxy command. */
104: if ((pid = fork()) == 0) {
105: char *argv[10];
106:
107: /* Child. Permanently give up superuser privileges. */
1.184 markus 108: permanently_drop_suid(original_real_uid);
1.38 markus 109:
110: /* Redirect stdin and stdout. */
111: close(pin[1]);
112: if (pin[0] != 0) {
113: if (dup2(pin[0], 0) < 0)
114: perror("dup2 stdin");
115: close(pin[0]);
116: }
117: close(pout[0]);
118: if (dup2(pout[1], 1) < 0)
119: perror("dup2 stdout");
120: /* Cannot be 1 because pin allocated two descriptors. */
121: close(pout[1]);
122:
123: /* Stderr is left as it is so that error messages get
124: printed on the user's terminal. */
1.201 djm 125: argv[0] = shell;
1.38 markus 126: argv[1] = "-c";
127: argv[2] = command_string;
128: argv[3] = NULL;
129:
130: /* Execute the proxy command. Note that we gave up any
131: extra privileges above. */
1.89 markus 132: execv(argv[0], argv);
133: perror(argv[0]);
1.38 markus 134: exit(1);
135: }
136: /* Parent. */
137: if (pid < 0)
138: fatal("fork failed: %.100s", strerror(errno));
1.135 djm 139: else
140: proxy_command_pid = pid; /* save pid to clean up later */
1.38 markus 141:
142: /* Close child side of the descriptors. */
143: close(pin[0]);
144: close(pout[1]);
145:
146: /* Free the command name. */
1.164 djm 147: xfree(command_string);
1.38 markus 148:
149: /* Set the connection file descriptors. */
150: packet_set_connection(pout[0], pin[1]);
1.207 ! dtucker 151: packet_set_timeout(options.server_alive_interval,
! 152: options.server_alive_count_max);
1.1 deraadt 153:
1.110 markus 154: /* Indicate OK return */
155: return 0;
1.1 deraadt 156: }
157:
1.39 deraadt 158: /*
159: * Creates a (possibly privileged) socket for use as the ssh connection.
160: */
1.109 itojun 161: static int
1.139 markus 162: ssh_create_socket(int privileged, struct addrinfo *ai)
1.1 deraadt 163: {
1.105 markus 164: int sock, gaierr;
165: struct addrinfo hints, *res;
1.1 deraadt 166:
1.40 markus 167: /*
168: * If we are running as root and want to connect to a privileged
169: * port, bind our own socket to a privileged port.
170: */
1.38 markus 171: if (privileged) {
172: int p = IPPORT_RESERVED - 1;
1.124 markus 173: PRIV_START;
1.139 markus 174: sock = rresvport_af(&p, ai->ai_family);
1.124 markus 175: PRIV_END;
1.38 markus 176: if (sock < 0)
1.139 markus 177: error("rresvport: af=%d %.100s", ai->ai_family,
178: strerror(errno));
1.55 markus 179: else
180: debug("Allocated local port %d.", p);
1.105 markus 181: return sock;
182: }
1.139 markus 183: sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.105 markus 184: if (sock < 0)
185: error("socket: %.100s", strerror(errno));
186:
187: /* Bind the socket to an alternative local IP address */
188: if (options.bind_address == NULL)
189: return sock;
190:
191: memset(&hints, 0, sizeof(hints));
1.139 markus 192: hints.ai_family = ai->ai_family;
193: hints.ai_socktype = ai->ai_socktype;
194: hints.ai_protocol = ai->ai_protocol;
1.105 markus 195: hints.ai_flags = AI_PASSIVE;
1.205 dtucker 196: gaierr = getaddrinfo(options.bind_address, NULL, &hints, &res);
1.105 markus 197: if (gaierr) {
198: error("getaddrinfo: %s: %s", options.bind_address,
1.203 dtucker 199: ssh_gai_strerror(gaierr));
1.105 markus 200: close(sock);
201: return -1;
202: }
203: if (bind(sock, res->ai_addr, res->ai_addrlen) < 0) {
204: error("bind: %s: %s", options.bind_address, strerror(errno));
205: close(sock);
206: freeaddrinfo(res);
207: return -1;
1.38 markus 208: }
1.105 markus 209: freeaddrinfo(res);
1.38 markus 210: return sock;
1.1 deraadt 211: }
212:
1.141 djm 213: static int
214: timeout_connect(int sockfd, const struct sockaddr *serv_addr,
1.202 djm 215: socklen_t addrlen, int *timeoutp)
1.141 djm 216: {
217: fd_set *fdset;
1.202 djm 218: struct timeval tv, t_start;
1.141 djm 219: socklen_t optlen;
1.179 djm 220: int optval, rc, result = -1;
1.141 djm 221:
1.202 djm 222: gettimeofday(&t_start, NULL);
223:
224: if (*timeoutp <= 0) {
225: result = connect(sockfd, serv_addr, addrlen);
226: goto done;
227: }
1.141 djm 228:
1.156 djm 229: set_nonblock(sockfd);
1.141 djm 230: rc = connect(sockfd, serv_addr, addrlen);
1.156 djm 231: if (rc == 0) {
232: unset_nonblock(sockfd);
1.202 djm 233: result = 0;
234: goto done;
235: }
236: if (errno != EINPROGRESS) {
237: result = -1;
238: goto done;
1.156 djm 239: }
1.141 djm 240:
1.179 djm 241: fdset = (fd_set *)xcalloc(howmany(sockfd + 1, NFDBITS),
242: sizeof(fd_mask));
1.141 djm 243: FD_SET(sockfd, fdset);
1.202 djm 244: ms_to_timeval(&tv, *timeoutp);
1.141 djm 245:
1.162 deraadt 246: for (;;) {
1.141 djm 247: rc = select(sockfd + 1, NULL, fdset, NULL, &tv);
248: if (rc != -1 || errno != EINTR)
249: break;
250: }
251:
1.162 deraadt 252: switch (rc) {
1.141 djm 253: case 0:
254: /* Timed out */
255: errno = ETIMEDOUT;
1.142 djm 256: break;
1.141 djm 257: case -1:
258: /* Select error */
1.154 djm 259: debug("select: %s", strerror(errno));
1.142 djm 260: break;
1.141 djm 261: case 1:
262: /* Completed or failed */
263: optval = 0;
264: optlen = sizeof(optval);
1.154 djm 265: if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval,
1.148 markus 266: &optlen) == -1) {
1.154 djm 267: debug("getsockopt: %s", strerror(errno));
1.142 djm 268: break;
1.148 markus 269: }
1.141 djm 270: if (optval != 0) {
271: errno = optval;
1.142 djm 272: break;
1.141 djm 273: }
1.142 djm 274: result = 0;
1.156 djm 275: unset_nonblock(sockfd);
1.141 djm 276: break;
277: default:
278: /* Should not occur */
279: fatal("Bogus return (%d) from select()", rc);
280: }
281:
1.142 djm 282: xfree(fdset);
1.202 djm 283:
284: done:
285: if (result == 0 && *timeoutp > 0) {
286: ms_subtract_diff(&t_start, timeoutp);
287: if (*timeoutp <= 0) {
288: errno = ETIMEDOUT;
289: result = -1;
290: }
291: }
292:
1.142 djm 293: return (result);
1.141 djm 294: }
295:
1.39 deraadt 296: /*
1.49 markus 297: * Opens a TCP/IP connection to the remote server on the given host.
298: * The address of the remote host will be returned in hostaddr.
1.124 markus 299: * If port is 0, the default port will be used. If needpriv is true,
1.39 deraadt 300: * a privileged port will be allocated to make the connection.
1.124 markus 301: * This requires super-user privileges if needpriv is true.
1.39 deraadt 302: * Connection_attempts specifies the maximum number of tries (one per
303: * second). If proxy_command is non-NULL, it specifies the command (with %h
304: * and %p substituted for host and port, respectively) to use to contact
305: * the daemon.
306: */
1.38 markus 307: int
1.49 markus 308: ssh_connect(const char *host, struct sockaddr_storage * hostaddr,
1.202 djm 309: u_short port, int family, int connection_attempts, int *timeout_ms,
310: int want_keepalive, int needpriv, const char *proxy_command)
1.1 deraadt 311: {
1.90 markus 312: int gaierr;
313: int on = 1;
1.49 markus 314: int sock = -1, attempt;
1.90 markus 315: char ntop[NI_MAXHOST], strport[NI_MAXSERV];
1.49 markus 316: struct addrinfo hints, *ai, *aitop;
1.38 markus 317:
1.136 markus 318: debug2("ssh_connect: needpriv %d", needpriv);
1.38 markus 319:
320: /* If a proxy command is given, connect using it. */
321: if (proxy_command != NULL)
1.124 markus 322: return ssh_proxy_connect(host, port, proxy_command);
1.38 markus 323:
324: /* No proxy command. */
325:
1.49 markus 326: memset(&hints, 0, sizeof(hints));
1.115 markus 327: hints.ai_family = family;
1.49 markus 328: hints.ai_socktype = SOCK_STREAM;
1.126 deraadt 329: snprintf(strport, sizeof strport, "%u", port);
1.49 markus 330: if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
1.203 dtucker 331: fatal("%s: Could not resolve hostname %.100s: %s", __progname,
332: host, ssh_gai_strerror(gaierr));
1.38 markus 333:
1.181 markus 334: for (attempt = 0; attempt < connection_attempts; attempt++) {
1.200 markus 335: if (attempt > 0) {
336: /* Sleep a moment before retrying. */
337: sleep(1);
1.38 markus 338: debug("Trying again...");
1.200 markus 339: }
1.181 markus 340: /*
341: * Loop through addresses for this host, and try each one in
342: * sequence until the connection succeeds.
343: */
1.49 markus 344: for (ai = aitop; ai; ai = ai->ai_next) {
345: if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
346: continue;
347: if (getnameinfo(ai->ai_addr, ai->ai_addrlen,
348: ntop, sizeof(ntop), strport, sizeof(strport),
349: NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
350: error("ssh_connect: getnameinfo failed");
351: continue;
352: }
353: debug("Connecting to %.200s [%.100s] port %s.",
354: host, ntop, strport);
355:
356: /* Create a socket for connecting. */
1.139 markus 357: sock = ssh_create_socket(needpriv, ai);
1.49 markus 358: if (sock < 0)
1.110 markus 359: /* Any error is already output */
1.49 markus 360: continue;
361:
1.141 djm 362: if (timeout_connect(sock, ai->ai_addr, ai->ai_addrlen,
1.202 djm 363: timeout_ms) >= 0) {
1.49 markus 364: /* Successful connection. */
1.102 markus 365: memcpy(hostaddr, ai->ai_addr, ai->ai_addrlen);
1.38 markus 366: break;
1.49 markus 367: } else {
1.131 itojun 368: debug("connect to address %s port %s: %s",
369: ntop, strport, strerror(errno));
1.38 markus 370: close(sock);
1.181 markus 371: sock = -1;
1.38 markus 372: }
373: }
1.181 markus 374: if (sock != -1)
1.49 markus 375: break; /* Successful connection. */
1.38 markus 376: }
1.49 markus 377:
378: freeaddrinfo(aitop);
379:
1.38 markus 380: /* Return failure if we didn't get a successful connection. */
1.181 markus 381: if (sock == -1) {
1.159 markus 382: error("ssh: connect to host %s port %s: %s",
1.130 itojun 383: host, strport, strerror(errno));
1.159 markus 384: return (-1);
1.130 itojun 385: }
1.38 markus 386:
387: debug("Connection established.");
1.90 markus 388:
1.155 markus 389: /* Set SO_KEEPALIVE if requested. */
1.202 djm 390: if (want_keepalive &&
1.90 markus 391: setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *)&on,
392: sizeof(on)) < 0)
393: error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno));
1.38 markus 394:
395: /* Set the connection. */
396: packet_set_connection(sock, sock);
1.207 ! dtucker 397: packet_set_timeout(options.server_alive_interval,
! 398: options.server_alive_count_max);
1.1 deraadt 399:
1.110 markus 400: return 0;
1.59 markus 401: }
402:
1.43 markus 403: /*
1.39 deraadt 404: * Waits for the server identification string, and sends our own
405: * identification string.
406: */
1.109 itojun 407: static void
1.202 djm 408: ssh_exchange_identification(int timeout_ms)
1.1 deraadt 409: {
1.38 markus 410: char buf[256], remote_version[256]; /* must be same size! */
1.165 djm 411: int remote_major, remote_minor, mismatch;
1.38 markus 412: int connection_in = packet_get_connection_in();
413: int connection_out = packet_get_connection_out();
1.93 stevesk 414: int minor1 = PROTOCOL_MINOR_1;
1.185 djm 415: u_int i, n;
1.202 djm 416: size_t len;
417: int fdsetsz, remaining, rc;
418: struct timeval t_start, t_remaining;
419: fd_set *fdset;
420:
421: fdsetsz = howmany(connection_in + 1, NFDBITS) * sizeof(fd_mask);
422: fdset = xcalloc(1, fdsetsz);
1.38 markus 423:
1.163 avsm 424: /* Read other side's version identification. */
1.202 djm 425: remaining = timeout_ms;
1.185 djm 426: for (n = 0;;) {
1.75 markus 427: for (i = 0; i < sizeof(buf) - 1; i++) {
1.202 djm 428: if (timeout_ms > 0) {
429: gettimeofday(&t_start, NULL);
430: ms_to_timeval(&t_remaining, remaining);
431: FD_SET(connection_in, fdset);
432: rc = select(connection_in + 1, fdset, NULL,
433: fdset, &t_remaining);
434: ms_subtract_diff(&t_start, &remaining);
435: if (rc == 0 || remaining <= 0)
436: fatal("Connection timed out during "
437: "banner exchange");
438: if (rc == -1) {
439: if (errno == EINTR)
440: continue;
441: fatal("ssh_exchange_identification: "
442: "select: %s", strerror(errno));
443: }
444: }
445:
446: len = atomicio(read, connection_in, &buf[i], 1);
1.163 avsm 447:
1.167 djm 448: if (len != 1 && errno == EPIPE)
1.202 djm 449: fatal("ssh_exchange_identification: "
450: "Connection closed by remote host");
1.163 avsm 451: else if (len != 1)
1.202 djm 452: fatal("ssh_exchange_identification: "
453: "read: %.100s", strerror(errno));
1.75 markus 454: if (buf[i] == '\r') {
455: buf[i] = '\n';
456: buf[i + 1] = 0;
457: continue; /**XXX wait for \n */
458: }
459: if (buf[i] == '\n') {
460: buf[i + 1] = 0;
461: break;
462: }
1.185 djm 463: if (++n > 65536)
1.202 djm 464: fatal("ssh_exchange_identification: "
465: "No banner received");
1.38 markus 466: }
1.75 markus 467: buf[sizeof(buf) - 1] = 0;
1.76 markus 468: if (strncmp(buf, "SSH-", 4) == 0)
1.38 markus 469: break;
1.75 markus 470: debug("ssh_exchange_identification: %s", buf);
1.38 markus 471: }
1.59 markus 472: server_version_string = xstrdup(buf);
1.202 djm 473: xfree(fdset);
1.38 markus 474:
1.40 markus 475: /*
476: * Check that the versions match. In future this might accept
477: * several versions and set appropriate flags to handle them.
478: */
1.59 markus 479: if (sscanf(server_version_string, "SSH-%d.%d-%[^\n]\n",
480: &remote_major, &remote_minor, remote_version) != 3)
1.38 markus 481: fatal("Bad remote protocol version identification: '%.100s'", buf);
482: debug("Remote protocol version %d.%d, remote software version %.100s",
1.118 deraadt 483: remote_major, remote_minor, remote_version);
1.38 markus 484:
1.59 markus 485: compat_datafellows(remote_version);
1.64 markus 486: mismatch = 0;
1.59 markus 487:
1.116 deraadt 488: switch (remote_major) {
1.64 markus 489: case 1:
490: if (remote_minor == 99 &&
491: (options.protocol & SSH_PROTO_2) &&
492: !(options.protocol & SSH_PROTO_1_PREFERRED)) {
493: enable_compat20();
494: break;
495: }
496: if (!(options.protocol & SSH_PROTO_1)) {
497: mismatch = 1;
498: break;
499: }
500: if (remote_minor < 3) {
501: fatal("Remote machine has too old SSH software version.");
1.81 markus 502: } else if (remote_minor == 3 || remote_minor == 4) {
1.64 markus 503: /* We speak 1.3, too. */
504: enable_compat13();
1.81 markus 505: minor1 = 3;
1.64 markus 506: if (options.forward_agent) {
1.138 itojun 507: logit("Agent forwarding disabled for protocol 1.3");
1.64 markus 508: options.forward_agent = 0;
509: }
510: }
511: break;
512: case 2:
513: if (options.protocol & SSH_PROTO_2) {
514: enable_compat20();
515: break;
1.38 markus 516: }
1.64 markus 517: /* FALLTHROUGH */
1.68 markus 518: default:
1.64 markus 519: mismatch = 1;
520: break;
1.38 markus 521: }
1.64 markus 522: if (mismatch)
1.38 markus 523: fatal("Protocol major versions differ: %d vs. %d",
1.64 markus 524: (options.protocol & SSH_PROTO_2) ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1,
525: remote_major);
1.38 markus 526: /* Send our own protocol version identification. */
527: snprintf(buf, sizeof buf, "SSH-%d.%d-%.100s\n",
1.64 markus 528: compat20 ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1,
1.81 markus 529: compat20 ? PROTOCOL_MINOR_2 : minor1,
1.59 markus 530: SSH_VERSION);
1.146 deraadt 531: if (atomicio(vwrite, connection_out, buf, strlen(buf)) != strlen(buf))
1.38 markus 532: fatal("write: %.100s", strerror(errno));
1.59 markus 533: client_version_string = xstrdup(buf);
534: chop(client_version_string);
535: chop(server_version_string);
536: debug("Local version string %.100s", client_version_string);
1.1 deraadt 537: }
538:
1.96 markus 539: /* defaults to 'no' */
1.109 itojun 540: static int
1.112 markus 541: confirm(const char *prompt)
1.1 deraadt 542: {
1.119 markus 543: const char *msg, *again = "Please type 'yes' or 'no': ";
544: char *p;
545: int ret = -1;
1.96 markus 546:
547: if (options.batch_mode)
548: return 0;
1.119 markus 549: for (msg = prompt;;msg = again) {
550: p = read_passphrase(msg, RP_ECHO);
551: if (p == NULL ||
552: (p[0] == '\0') || (p[0] == '\n') ||
553: strncasecmp(p, "no", 2) == 0)
554: ret = 0;
1.127 markus 555: if (p && strncasecmp(p, "yes", 3) == 0)
1.119 markus 556: ret = 1;
557: if (p)
558: xfree(p);
559: if (ret != -1)
560: return ret;
1.1 deraadt 561: }
562: }
563:
1.39 deraadt 564: /*
1.108 markus 565: * check whether the supplied host key is valid, return -1 if the key
566: * is not valid. the user_hostfile will not be updated if 'readonly' is true.
1.39 deraadt 567: */
1.197 dtucker 568: #define RDRW 0
569: #define RDONLY 1
570: #define ROQUIET 2
1.109 itojun 571: static int
1.197 dtucker 572: check_host_key(char *hostname, struct sockaddr *hostaddr, u_short port,
573: Key *host_key, int readonly, const char *user_hostfile,
574: const char *system_hostfile)
1.1 deraadt 575: {
1.58 markus 576: Key *file_key;
1.152 jakob 577: const char *type = key_type(host_key);
1.189 dtucker 578: char *ip = NULL, *host = NULL;
1.204 grunk 579: char hostline[1000], *hostp, *fp, *ra;
1.38 markus 580: HostStatus host_status;
581: HostStatus ip_status;
1.161 djm 582: int r, local = 0, host_ip_differ = 0;
1.49 markus 583: char ntop[NI_MAXHOST];
1.119 markus 584: char msg[1024];
1.145 jakob 585: int len, host_line, ip_line;
1.85 markus 586: const char *host_file = NULL, *ip_file = NULL;
1.206 grunk 587: int display_randomart;
1.49 markus 588:
589: /*
590: * Force accepting of the host key for loopback/localhost. The
591: * problem is that if the home directory is NFS-mounted to multiple
592: * machines, localhost will refer to a different machine in each of
593: * them, and the user will get bogus HOST_CHANGED warnings. This
594: * essentially disables host authentication for localhost; however,
595: * this is probably not a real problem.
596: */
1.70 markus 597: /** hostaddr == 0! */
1.49 markus 598: switch (hostaddr->sa_family) {
599: case AF_INET:
1.108 markus 600: local = (ntohl(((struct sockaddr_in *)hostaddr)->
1.168 djm 601: sin_addr.s_addr) >> 24) == IN_LOOPBACKNET;
1.49 markus 602: break;
603: case AF_INET6:
1.108 markus 604: local = IN6_IS_ADDR_LOOPBACK(
605: &(((struct sockaddr_in6 *)hostaddr)->sin6_addr));
1.49 markus 606: break;
607: default:
608: local = 0;
609: break;
610: }
1.111 markus 611: if (options.no_host_authentication_for_localhost == 1 && local &&
612: options.host_key_alias == NULL) {
1.88 markus 613: debug("Forcing accepting of host key for "
614: "loopback/localhost.");
1.108 markus 615: return 0;
1.49 markus 616: }
1.42 markus 617:
618: /*
1.88 markus 619: * We don't have the remote ip-address for connections
620: * using a proxy command
1.42 markus 621: */
1.84 markus 622: if (options.proxy_command == NULL) {
623: if (getnameinfo(hostaddr, hostaddr->sa_len, ntop, sizeof(ntop),
1.86 markus 624: NULL, 0, NI_NUMERICHOST) != 0)
1.84 markus 625: fatal("check_host_key: getnameinfo failed");
1.197 dtucker 626: ip = put_host_port(ntop, port);
1.84 markus 627: } else {
628: ip = xstrdup("<no hostip for proxy command>");
1.86 markus 629: }
1.206 grunk 630:
631: /*
632: * check_host_ip may be set to zero in the next step, so if it
633: * conveys a request to display the random art, save it away.
634: */
635: display_randomart = (options.check_host_ip == SSHCTL_CHECKHOSTIP_FPR);
636:
1.88 markus 637: /*
638: * Turn off check_host_ip if the connection is to localhost, via proxy
639: * command or if we don't have a hostname to compare with
640: */
1.189 dtucker 641: if (options.check_host_ip && (local ||
642: strcmp(hostname, ip) == 0 || options.proxy_command != NULL))
1.88 markus 643: options.check_host_ip = 0;
1.86 markus 644:
645: /*
1.189 dtucker 646: * Allow the user to record the key under a different name or
647: * differentiate a non-standard port. This is useful for ssh
648: * tunneling over forwarded connections or if you run multiple
649: * sshd's on different ports on the same machine.
1.86 markus 650: */
651: if (options.host_key_alias != NULL) {
1.189 dtucker 652: host = xstrdup(options.host_key_alias);
1.86 markus 653: debug("using hostkeyalias: %s", host);
1.189 dtucker 654: } else {
1.197 dtucker 655: host = put_host_port(hostname, port);
1.84 markus 656: }
1.38 markus 657:
1.46 markus 658: /*
659: * Store the host key from the known host file in here so that we can
660: * compare it with the key for the IP address.
661: */
1.58 markus 662: file_key = key_new(host_key->type);
1.38 markus 663:
1.40 markus 664: /*
1.170 djm 665: * Check if the host key is present in the user's list of known
1.40 markus 666: * hosts or in the systemwide list.
667: */
1.85 markus 668: host_file = user_hostfile;
1.108 markus 669: host_status = check_host_in_hostfile(host_file, host, host_key,
1.118 deraadt 670: file_key, &host_line);
1.85 markus 671: if (host_status == HOST_NEW) {
672: host_file = system_hostfile;
1.108 markus 673: host_status = check_host_in_hostfile(host_file, host, host_key,
674: file_key, &host_line);
1.85 markus 675: }
1.40 markus 676: /*
677: * Also perform check for the ip address, skip the check if we are
678: * localhost or the hostname was an ip address to begin with
679: */
1.88 markus 680: if (options.check_host_ip) {
1.58 markus 681: Key *ip_key = key_new(host_key->type);
1.38 markus 682:
1.85 markus 683: ip_file = user_hostfile;
1.108 markus 684: ip_status = check_host_in_hostfile(ip_file, ip, host_key,
685: ip_key, &ip_line);
1.85 markus 686: if (ip_status == HOST_NEW) {
687: ip_file = system_hostfile;
1.108 markus 688: ip_status = check_host_in_hostfile(ip_file, ip,
689: host_key, ip_key, &ip_line);
1.85 markus 690: }
1.38 markus 691: if (host_status == HOST_CHANGED &&
1.58 markus 692: (ip_status != HOST_CHANGED || !key_equal(ip_key, file_key)))
1.38 markus 693: host_ip_differ = 1;
694:
1.58 markus 695: key_free(ip_key);
1.38 markus 696: } else
697: ip_status = host_status;
698:
1.58 markus 699: key_free(file_key);
1.38 markus 700:
701: switch (host_status) {
702: case HOST_OK:
703: /* The host is known and the key matches. */
1.72 markus 704: debug("Host '%.200s' is known and matches the %s host key.",
705: host, type);
1.85 markus 706: debug("Found key in %s:%d", host_file, host_line);
1.88 markus 707: if (options.check_host_ip && ip_status == HOST_NEW) {
1.108 markus 708: if (readonly)
1.138 itojun 709: logit("%s host key for IP address "
1.108 markus 710: "'%.128s' not in list of known hosts.",
711: type, ip);
712: else if (!add_host_to_hostfile(user_hostfile, ip,
1.160 djm 713: host_key, options.hash_known_hosts))
1.138 itojun 714: logit("Failed to add the %s host key for IP "
1.108 markus 715: "address '%.128s' to the list of known "
716: "hosts (%.30s).", type, ip, user_hostfile);
1.88 markus 717: else
1.138 itojun 718: logit("Warning: Permanently added the %s host "
1.108 markus 719: "key for IP address '%.128s' to the list "
720: "of known hosts.", type, ip);
1.206 grunk 721: } else if (display_randomart) {
1.204 grunk 722: fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX);
723: ra = key_fingerprint(host_key, SSH_FP_MD5,
724: SSH_FP_RANDOMART);
725: logit("Host key fingerprint is %s\n%s\n", fp, ra);
726: xfree(ra);
727: xfree(fp);
1.38 markus 728: }
729: break;
730: case HOST_NEW:
1.197 dtucker 731: if (options.host_key_alias == NULL && port != 0 &&
732: port != SSH_DEFAULT_PORT) {
733: debug("checking without port identifier");
734: if (check_host_key(hostname, hostaddr, 0, host_key, 2,
735: user_hostfile, system_hostfile) == 0) {
736: debug("found matching key w/out port");
737: break;
738: }
739: }
1.108 markus 740: if (readonly)
741: goto fail;
1.38 markus 742: /* The host is new. */
743: if (options.strict_host_key_checking == 1) {
1.108 markus 744: /*
745: * User has requested strict host key checking. We
746: * will not add the host key automatically. The only
747: * alternative left is to abort.
748: */
749: error("No %s host key is known for %.200s and you "
750: "have requested strict checking.", type, host);
751: goto fail;
1.38 markus 752: } else if (options.strict_host_key_checking == 2) {
1.145 jakob 753: char msg1[1024], msg2[1024];
754:
755: if (show_other_keys(host, host_key))
756: snprintf(msg1, sizeof(msg1),
1.168 djm 757: "\nbut keys of different type are already"
758: " known for this host.");
1.145 jakob 759: else
760: snprintf(msg1, sizeof(msg1), ".");
1.38 markus 761: /* The default */
1.100 markus 762: fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX);
1.204 grunk 763: ra = key_fingerprint(host_key, SSH_FP_MD5,
764: SSH_FP_RANDOMART);
1.145 jakob 765: msg2[0] = '\0';
766: if (options.verify_host_key_dns) {
1.153 jakob 767: if (matching_host_key_dns)
1.145 jakob 768: snprintf(msg2, sizeof(msg2),
769: "Matching host key fingerprint"
770: " found in DNS.\n");
771: else
772: snprintf(msg2, sizeof(msg2),
773: "No matching host key fingerprint"
774: " found in DNS.\n");
775: }
1.119 markus 776: snprintf(msg, sizeof(msg),
1.108 markus 777: "The authenticity of host '%.200s (%s)' can't be "
1.132 markus 778: "established%s\n"
1.204 grunk 779: "%s key fingerprint is %s.\n%s\n%s"
1.108 markus 780: "Are you sure you want to continue connecting "
1.132 markus 781: "(yes/no)? ",
1.204 grunk 782: host, ip, msg1, type, fp, ra, msg2);
783: xfree(ra);
1.100 markus 784: xfree(fp);
1.119 markus 785: if (!confirm(msg))
1.108 markus 786: goto fail;
1.38 markus 787: }
1.161 djm 788: /*
789: * If not in strict mode, add the key automatically to the
790: * local known_hosts file.
791: */
1.88 markus 792: if (options.check_host_ip && ip_status == HOST_NEW) {
1.161 djm 793: snprintf(hostline, sizeof(hostline), "%s,%s",
794: host, ip);
1.38 markus 795: hostp = hostline;
1.161 djm 796: if (options.hash_known_hosts) {
797: /* Add hash of host and IP separately */
798: r = add_host_to_hostfile(user_hostfile, host,
799: host_key, options.hash_known_hosts) &&
800: add_host_to_hostfile(user_hostfile, ip,
801: host_key, options.hash_known_hosts);
802: } else {
803: /* Add unhashed "host,ip" */
804: r = add_host_to_hostfile(user_hostfile,
805: hostline, host_key,
806: options.hash_known_hosts);
807: }
808: } else {
809: r = add_host_to_hostfile(user_hostfile, host, host_key,
810: options.hash_known_hosts);
1.38 markus 811: hostp = host;
1.161 djm 812: }
1.38 markus 813:
1.161 djm 814: if (!r)
1.138 itojun 815: logit("Failed to add the host to the list of known "
1.108 markus 816: "hosts (%.500s).", user_hostfile);
1.38 markus 817: else
1.138 itojun 818: logit("Warning: Permanently added '%.200s' (%s) to the "
1.108 markus 819: "list of known hosts.", hostp, type);
1.38 markus 820: break;
821: case HOST_CHANGED:
1.197 dtucker 822: if (readonly == ROQUIET)
823: goto fail;
1.38 markus 824: if (options.check_host_ip && host_ip_differ) {
1.158 avsm 825: char *key_msg;
1.38 markus 826: if (ip_status == HOST_NEW)
1.158 avsm 827: key_msg = "is unknown";
1.38 markus 828: else if (ip_status == HOST_OK)
1.158 avsm 829: key_msg = "is unchanged";
1.38 markus 830: else
1.158 avsm 831: key_msg = "has a different value";
1.38 markus 832: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
833: error("@ WARNING: POSSIBLE DNS SPOOFING DETECTED! @");
834: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1.72 markus 835: error("The %s host key for %s has changed,", type, host);
1.38 markus 836: error("and the key for the according IP address %s", ip);
1.158 avsm 837: error("%s. This could either mean that", key_msg);
1.38 markus 838: error("DNS SPOOFING is happening or the IP address for the host");
1.85 markus 839: error("and its host key have changed at the same time.");
1.88 markus 840: if (ip_status != HOST_NEW)
1.85 markus 841: error("Offending key for IP in %s:%d", ip_file, ip_line);
1.38 markus 842: }
843: /* The host key has changed. */
1.150 jakob 844: warn_changed_key(host_key);
1.38 markus 845: error("Add correct host key in %.100s to get rid of this message.",
1.87 markus 846: user_hostfile);
1.85 markus 847: error("Offending key in %s:%d", host_file, host_line);
1.38 markus 848:
1.40 markus 849: /*
850: * If strict host key checking is in use, the user will have
851: * to edit the key manually and we can only abort.
852: */
1.108 markus 853: if (options.strict_host_key_checking) {
854: error("%s host key for %.200s has changed and you have "
855: "requested strict checking.", type, host);
856: goto fail;
857: }
1.38 markus 858:
1.40 markus 859: /*
860: * If strict host key checking has not been requested, allow
1.144 djm 861: * the connection but without MITM-able authentication or
1.194 stevesk 862: * forwarding.
1.40 markus 863: */
1.38 markus 864: if (options.password_authentication) {
1.108 markus 865: error("Password authentication is disabled to avoid "
866: "man-in-the-middle attacks.");
1.38 markus 867: options.password_authentication = 0;
1.144 djm 868: }
869: if (options.kbd_interactive_authentication) {
870: error("Keyboard-interactive authentication is disabled"
871: " to avoid man-in-the-middle attacks.");
872: options.kbd_interactive_authentication = 0;
873: options.challenge_response_authentication = 0;
874: }
875: if (options.challenge_response_authentication) {
876: error("Challenge/response authentication is disabled"
877: " to avoid man-in-the-middle attacks.");
878: options.challenge_response_authentication = 0;
1.38 markus 879: }
880: if (options.forward_agent) {
1.108 markus 881: error("Agent forwarding is disabled to avoid "
882: "man-in-the-middle attacks.");
1.38 markus 883: options.forward_agent = 0;
1.83 markus 884: }
885: if (options.forward_x11) {
1.108 markus 886: error("X11 forwarding is disabled to avoid "
887: "man-in-the-middle attacks.");
1.83 markus 888: options.forward_x11 = 0;
889: }
1.108 markus 890: if (options.num_local_forwards > 0 ||
891: options.num_remote_forwards > 0) {
892: error("Port forwarding is disabled to avoid "
893: "man-in-the-middle attacks.");
894: options.num_local_forwards =
1.118 deraadt 895: options.num_remote_forwards = 0;
1.194 stevesk 896: }
897: if (options.tun_open != SSH_TUNMODE_NO) {
898: error("Tunnel forwarding is disabled to avoid "
899: "man-in-the-middle attacks.");
900: options.tun_open = SSH_TUNMODE_NO;
1.38 markus 901: }
1.40 markus 902: /*
903: * XXX Should permit the user to change to use the new id.
904: * This could be done by converting the host key to an
905: * identifying sentence, tell that the host identifies itself
906: * by that sentence, and ask the user if he/she whishes to
907: * accept the authentication.
908: */
1.38 markus 909: break;
1.132 markus 910: case HOST_FOUND:
911: fatal("internal error");
912: break;
1.88 markus 913: }
914:
915: if (options.check_host_ip && host_status != HOST_CHANGED &&
916: ip_status == HOST_CHANGED) {
1.119 markus 917: snprintf(msg, sizeof(msg),
918: "Warning: the %s host key for '%.200s' "
919: "differs from the key for the IP address '%.128s'"
920: "\nOffending key for IP in %s:%d",
921: type, host, ip, ip_file, ip_line);
922: if (host_status == HOST_OK) {
923: len = strlen(msg);
924: snprintf(msg + len, sizeof(msg) - len,
925: "\nMatching host key in %s:%d",
1.125 deraadt 926: host_file, host_line);
1.119 markus 927: }
1.88 markus 928: if (options.strict_host_key_checking == 1) {
1.143 djm 929: logit("%s", msg);
1.108 markus 930: error("Exiting, you have requested strict checking.");
931: goto fail;
1.88 markus 932: } else if (options.strict_host_key_checking == 2) {
1.119 markus 933: strlcat(msg, "\nAre you sure you want "
934: "to continue connecting (yes/no)? ", sizeof(msg));
935: if (!confirm(msg))
1.108 markus 936: goto fail;
1.119 markus 937: } else {
1.143 djm 938: logit("%s", msg);
1.88 markus 939: }
1.38 markus 940: }
1.82 provos 941:
942: xfree(ip);
1.189 dtucker 943: xfree(host);
1.108 markus 944: return 0;
945:
946: fail:
947: xfree(ip);
1.189 dtucker 948: xfree(host);
1.108 markus 949: return -1;
950: }
951:
1.140 jakob 952: /* returns 0 if key verifies or -1 if key does NOT verify */
1.108 markus 953: int
954: verify_host_key(char *host, struct sockaddr *hostaddr, Key *host_key)
955: {
956: struct stat st;
1.153 jakob 957: int flags = 0;
1.140 jakob 958:
1.153 jakob 959: if (options.verify_host_key_dns &&
960: verify_host_key_dns(host, hostaddr, host_key, &flags) == 0) {
961:
962: if (flags & DNS_VERIFY_FOUND) {
963:
964: if (options.verify_host_key_dns == 1 &&
965: flags & DNS_VERIFY_MATCH &&
966: flags & DNS_VERIFY_SECURE)
967: return 0;
968:
969: if (flags & DNS_VERIFY_MATCH) {
970: matching_host_key_dns = 1;
971: } else {
972: warn_changed_key(host_key);
973: error("Update the SSHFP RR in DNS with the new "
974: "host key to get rid of this message.");
975: }
1.140 jakob 976: }
977: }
1.108 markus 978:
979: /* return ok if the key can be found in an old keyfile */
980: if (stat(options.system_hostfile2, &st) == 0 ||
981: stat(options.user_hostfile2, &st) == 0) {
1.197 dtucker 982: if (check_host_key(host, hostaddr, options.port, host_key,
983: RDONLY, options.user_hostfile2,
984: options.system_hostfile2) == 0)
1.108 markus 985: return 0;
986: }
1.197 dtucker 987: return check_host_key(host, hostaddr, options.port, host_key,
988: RDRW, options.user_hostfile, options.system_hostfile);
1.51 markus 989: }
1.70 markus 990:
1.51 markus 991: /*
992: * Starts a dialog with the server, and authenticates the current user on the
993: * server. This does not need any extra privileges. The basic connection
994: * to the server must already have been established before this is called.
995: * If login fails, this function prints an error and never returns.
996: * This function does not require super-user privileges.
997: */
998: void
1.120 markus 999: ssh_login(Sensitive *sensitive, const char *orighost,
1.202 djm 1000: struct sockaddr *hostaddr, struct passwd *pw, int timeout_ms)
1.51 markus 1001: {
1002: char *host, *cp;
1.70 markus 1003: char *server_user, *local_user;
1004:
1005: local_user = xstrdup(pw->pw_name);
1006: server_user = options.user ? options.user : local_user;
1.51 markus 1007:
1008: /* Convert the user-supplied hostname into all lowercase. */
1009: host = xstrdup(orighost);
1010: for (cp = host; *cp; cp++)
1011: if (isupper(*cp))
1.178 deraadt 1012: *cp = (char)tolower(*cp);
1.51 markus 1013:
1014: /* Exchange protocol version identification strings with the server. */
1.202 djm 1015: ssh_exchange_identification(timeout_ms);
1.51 markus 1016:
1017: /* Put the connection into non-blocking mode. */
1018: packet_set_nonblocking();
1019:
1020: /* key exchange */
1021: /* authenticate user */
1.59 markus 1022: if (compat20) {
1023: ssh_kex2(host, hostaddr);
1.120 markus 1024: ssh_userauth2(local_user, server_user, host, sensitive);
1.59 markus 1025: } else {
1026: ssh_kex(host, hostaddr);
1.120 markus 1027: ssh_userauth1(local_user, server_user, host, sensitive);
1.59 markus 1028: }
1.182 markus 1029: xfree(local_user);
1.97 markus 1030: }
1031:
1032: void
1033: ssh_put_password(char *password)
1034: {
1035: int size;
1036: char *padded;
1037:
1.99 deraadt 1038: if (datafellows & SSH_BUG_PASSWORDPAD) {
1.107 markus 1039: packet_put_cstring(password);
1.99 deraadt 1040: return;
1041: }
1.97 markus 1042: size = roundup(strlen(password) + 1, 32);
1.179 djm 1043: padded = xcalloc(1, size);
1.97 markus 1044: strlcpy(padded, password, size);
1045: packet_put_string(padded, size);
1046: memset(padded, 0, size);
1047: xfree(padded);
1.132 markus 1048: }
1049:
1050: static int
1051: show_key_from_file(const char *file, const char *host, int keytype)
1052: {
1053: Key *found;
1.204 grunk 1054: char *fp, *ra;
1.132 markus 1055: int line, ret;
1056:
1057: found = key_new(keytype);
1058: if ((ret = lookup_key_in_hostfile_by_type(file, host,
1059: keytype, found, &line))) {
1060: fp = key_fingerprint(found, SSH_FP_MD5, SSH_FP_HEX);
1.204 grunk 1061: ra = key_fingerprint(found, SSH_FP_MD5, SSH_FP_RANDOMART);
1.138 itojun 1062: logit("WARNING: %s key found for host %s\n"
1.133 markus 1063: "in %s:%d\n"
1.204 grunk 1064: "%s key fingerprint %s.\n%s\n",
1.132 markus 1065: key_type(found), host, file, line,
1.204 grunk 1066: key_type(found), fp, ra);
1067: xfree(ra);
1.132 markus 1068: xfree(fp);
1069: }
1070: key_free(found);
1071: return (ret);
1072: }
1073:
1074: /* print all known host keys for a given host, but skip keys of given type */
1075: static int
1076: show_other_keys(const char *host, Key *key)
1077: {
1078: int type[] = { KEY_RSA1, KEY_RSA, KEY_DSA, -1};
1079: int i, found = 0;
1080:
1081: for (i = 0; type[i] != -1; i++) {
1082: if (type[i] == key->type)
1083: continue;
1084: if (type[i] != KEY_RSA1 &&
1085: show_key_from_file(options.user_hostfile2, host, type[i])) {
1086: found = 1;
1087: continue;
1088: }
1089: if (type[i] != KEY_RSA1 &&
1090: show_key_from_file(options.system_hostfile2, host, type[i])) {
1091: found = 1;
1092: continue;
1093: }
1094: if (show_key_from_file(options.user_hostfile, host, type[i])) {
1095: found = 1;
1096: continue;
1097: }
1098: if (show_key_from_file(options.system_hostfile, host, type[i])) {
1099: found = 1;
1100: continue;
1101: }
1102: debug2("no key of type %d for host %s", type[i], host);
1103: }
1104: return (found);
1.150 jakob 1105: }
1106:
1107: static void
1108: warn_changed_key(Key *host_key)
1109: {
1110: char *fp;
1.151 jakob 1111: const char *type = key_type(host_key);
1.150 jakob 1112:
1113: fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX);
1114:
1115: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1116: error("@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @");
1117: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1118: error("IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!");
1119: error("Someone could be eavesdropping on you right now (man-in-the-middle attack)!");
1120: error("It is also possible that the %s host key has just been changed.", type);
1121: error("The fingerprint for the %s key sent by the remote host is\n%s.",
1122: type, fp);
1123: error("Please contact your system administrator.");
1124:
1125: xfree(fp);
1.171 reyk 1126: }
1127:
1128: /*
1129: * Execute a local command
1130: */
1131: int
1132: ssh_local_cmd(const char *args)
1133: {
1134: char *shell;
1135: pid_t pid;
1136: int status;
1137:
1138: if (!options.permit_local_command ||
1139: args == NULL || !*args)
1140: return (1);
1141:
1142: if ((shell = getenv("SHELL")) == NULL)
1143: shell = _PATH_BSHELL;
1144:
1145: pid = fork();
1146: if (pid == 0) {
1147: debug3("Executing %s -c \"%s\"", shell, args);
1148: execl(shell, shell, "-c", args, (char *)NULL);
1149: error("Couldn't execute %s -c \"%s\": %s",
1150: shell, args, strerror(errno));
1151: _exit(1);
1152: } else if (pid == -1)
1153: fatal("fork failed: %.100s", strerror(errno));
1154: while (waitpid(pid, &status, 0) == -1)
1155: if (errno != EINTR)
1156: fatal("Couldn't wait for child: %s", strerror(errno));
1157:
1158: if (!WIFEXITED(status))
1159: return (1);
1160:
1161: return (WEXITSTATUS(status));
1.1 deraadt 1162: }
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