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9794d008 | 1 | /* $OpenBSD: sshconnect.c,v 1.187 2006/07/05 02:42:09 stevesk Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
5 | * All rights reserved | |
5260325f | 6 | * Code to connect to a remote host, and to perform the client side of the |
7 | * login (authentication) dialog. | |
bcbf86ec | 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". | |
5260325f | 14 | */ |
8efc0c15 | 15 | |
16 | #include "includes.h" | |
aa2eae64 | 17 | |
18 | #include <sys/types.h> | |
19 | #include <sys/wait.h> | |
4095f623 | 20 | #include <sys/stat.h> |
9794d008 | 21 | #include <sys/socket.h> |
22 | ||
23 | #include <netinet/in.h> | |
a75f5360 | 24 | |
b6438382 | 25 | #include <ctype.h> |
b5b88c19 | 26 | #ifdef HAVE_PATHS_H |
a75f5360 | 27 | #include <paths.h> |
b5b88c19 | 28 | #endif |
8efc0c15 | 29 | |
42f11eb2 | 30 | #include "ssh.h" |
8efc0c15 | 31 | #include "xmalloc.h" |
32 | #include "rsa.h" | |
8ce64345 | 33 | #include "buffer.h" |
8efc0c15 | 34 | #include "packet.h" |
8efc0c15 | 35 | #include "uidswap.h" |
36 | #include "compat.h" | |
4fe2af09 | 37 | #include "key.h" |
a306f2dd | 38 | #include "sshconnect.h" |
4fe2af09 | 39 | #include "hostfile.h" |
42f11eb2 | 40 | #include "log.h" |
41 | #include "readconf.h" | |
42 | #include "atomicio.h" | |
43 | #include "misc.h" | |
21289cd0 | 44 | #include "dns.h" |
28015df4 | 45 | #include "version.h" |
21289cd0 | 46 | |
a306f2dd | 47 | char *client_version_string = NULL; |
48 | char *server_version_string = NULL; | |
8ce64345 | 49 | |
ed82a2a9 | 50 | static int matching_host_key_dns = 0; |
1432b5c4 | 51 | |
3fb156df | 52 | /* import */ |
57112b5a | 53 | extern Options options; |
48e671d5 | 54 | extern char *__progname; |
3fb156df | 55 | extern uid_t original_real_uid; |
56 | extern uid_t original_effective_uid; | |
6939bbd4 | 57 | extern pid_t proxy_command_pid; |
57112b5a | 58 | |
a704dd54 | 59 | #ifndef INET6_ADDRSTRLEN /* for non IPv6 machines */ |
60 | #define INET6_ADDRSTRLEN 46 | |
61 | #endif | |
62 | ||
8a48a7ef | 63 | static int show_other_keys(const char *, Key *); |
1a1bc5d5 | 64 | static void warn_changed_key(Key *); |
8a48a7ef | 65 | |
5260325f | 66 | /* |
67 | * Connect to the given ssh server using a proxy command. | |
68 | */ | |
396c147e | 69 | static int |
3fb156df | 70 | ssh_proxy_connect(const char *host, u_short port, const char *proxy_command) |
8efc0c15 | 71 | { |
a980cbd7 | 72 | char *command_string, *tmp; |
5260325f | 73 | int pin[2], pout[2]; |
9da5c3c9 | 74 | pid_t pid; |
48e671d5 | 75 | char strport[NI_MAXSERV]; |
5260325f | 76 | |
77 | /* Convert the port number into a string. */ | |
48e671d5 | 78 | snprintf(strport, sizeof strport, "%hu", port); |
5260325f | 79 | |
6939bbd4 | 80 | /* |
81 | * Build the final command string in the buffer by making the | |
82 | * appropriate substitutions to the given proxy command. | |
83 | * | |
aff51935 | 84 | * Use "exec" to avoid "sh -c" processes on some platforms |
6939bbd4 | 85 | * (e.g. Solaris) |
86 | */ | |
52e3daed | 87 | xasprintf(&tmp, "exec %s", proxy_command); |
a980cbd7 | 88 | command_string = percent_expand(tmp, "h", host, |
89 | "p", strport, (char *)NULL); | |
90 | xfree(tmp); | |
5260325f | 91 | |
92 | /* Create pipes for communicating with the proxy. */ | |
93 | if (pipe(pin) < 0 || pipe(pout) < 0) | |
94 | fatal("Could not create pipes to communicate with the proxy: %.100s", | |
184eed6a | 95 | strerror(errno)); |
5260325f | 96 | |
97 | debug("Executing proxy command: %.500s", command_string); | |
98 | ||
99 | /* Fork and execute the proxy command. */ | |
100 | if ((pid = fork()) == 0) { | |
101 | char *argv[10]; | |
102 | ||
103 | /* Child. Permanently give up superuser privileges. */ | |
3c33c1b6 | 104 | permanently_drop_suid(original_real_uid); |
5260325f | 105 | |
106 | /* Redirect stdin and stdout. */ | |
107 | close(pin[1]); | |
108 | if (pin[0] != 0) { | |
109 | if (dup2(pin[0], 0) < 0) | |
110 | perror("dup2 stdin"); | |
111 | close(pin[0]); | |
112 | } | |
113 | close(pout[0]); | |
114 | if (dup2(pout[1], 1) < 0) | |
115 | perror("dup2 stdout"); | |
116 | /* Cannot be 1 because pin allocated two descriptors. */ | |
117 | close(pout[1]); | |
118 | ||
119 | /* Stderr is left as it is so that error messages get | |
120 | printed on the user's terminal. */ | |
30228d7c | 121 | argv[0] = _PATH_BSHELL; |
5260325f | 122 | argv[1] = "-c"; |
123 | argv[2] = command_string; | |
124 | argv[3] = NULL; | |
125 | ||
126 | /* Execute the proxy command. Note that we gave up any | |
127 | extra privileges above. */ | |
328654d8 | 128 | execv(argv[0], argv); |
129 | perror(argv[0]); | |
5260325f | 130 | exit(1); |
8efc0c15 | 131 | } |
5260325f | 132 | /* Parent. */ |
133 | if (pid < 0) | |
134 | fatal("fork failed: %.100s", strerror(errno)); | |
6939bbd4 | 135 | else |
136 | proxy_command_pid = pid; /* save pid to clean up later */ | |
5260325f | 137 | |
138 | /* Close child side of the descriptors. */ | |
139 | close(pin[0]); | |
140 | close(pout[1]); | |
141 | ||
142 | /* Free the command name. */ | |
a980cbd7 | 143 | xfree(command_string); |
5260325f | 144 | |
145 | /* Set the connection file descriptors. */ | |
146 | packet_set_connection(pout[0], pin[1]); | |
8efc0c15 | 147 | |
ce773142 | 148 | /* Indicate OK return */ |
149 | return 0; | |
5260325f | 150 | } |
8efc0c15 | 151 | |
5260325f | 152 | /* |
153 | * Creates a (possibly privileged) socket for use as the ssh connection. | |
154 | */ | |
396c147e | 155 | static int |
3e131a6d | 156 | ssh_create_socket(int privileged, struct addrinfo *ai) |
8efc0c15 | 157 | { |
3435f5a6 | 158 | int sock, gaierr; |
159 | struct addrinfo hints, *res; | |
5260325f | 160 | |
aa3378df | 161 | /* |
162 | * If we are running as root and want to connect to a privileged | |
163 | * port, bind our own socket to a privileged port. | |
164 | */ | |
5260325f | 165 | if (privileged) { |
166 | int p = IPPORT_RESERVED - 1; | |
3fb156df | 167 | PRIV_START; |
3e131a6d | 168 | sock = rresvport_af(&p, ai->ai_family); |
3fb156df | 169 | PRIV_END; |
5260325f | 170 | if (sock < 0) |
3e131a6d | 171 | error("rresvport: af=%d %.100s", ai->ai_family, |
172 | strerror(errno)); | |
c8d54615 | 173 | else |
174 | debug("Allocated local port %d.", p); | |
3435f5a6 | 175 | return sock; |
176 | } | |
3e131a6d | 177 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
3435f5a6 | 178 | if (sock < 0) |
179 | error("socket: %.100s", strerror(errno)); | |
3435f5a6 | 180 | |
181 | /* Bind the socket to an alternative local IP address */ | |
182 | if (options.bind_address == NULL) | |
183 | return sock; | |
184 | ||
185 | memset(&hints, 0, sizeof(hints)); | |
3e131a6d | 186 | hints.ai_family = ai->ai_family; |
187 | hints.ai_socktype = ai->ai_socktype; | |
188 | hints.ai_protocol = ai->ai_protocol; | |
3435f5a6 | 189 | hints.ai_flags = AI_PASSIVE; |
190 | gaierr = getaddrinfo(options.bind_address, "0", &hints, &res); | |
191 | if (gaierr) { | |
192 | error("getaddrinfo: %s: %s", options.bind_address, | |
193 | gai_strerror(gaierr)); | |
194 | close(sock); | |
195 | return -1; | |
196 | } | |
197 | if (bind(sock, res->ai_addr, res->ai_addrlen) < 0) { | |
198 | error("bind: %s: %s", options.bind_address, strerror(errno)); | |
199 | close(sock); | |
200 | freeaddrinfo(res); | |
201 | return -1; | |
5260325f | 202 | } |
3435f5a6 | 203 | freeaddrinfo(res); |
5260325f | 204 | return sock; |
8efc0c15 | 205 | } |
206 | ||
09ab3296 | 207 | static int |
208 | timeout_connect(int sockfd, const struct sockaddr *serv_addr, | |
209 | socklen_t addrlen, int timeout) | |
210 | { | |
211 | fd_set *fdset; | |
212 | struct timeval tv; | |
213 | socklen_t optlen; | |
52e3daed | 214 | int optval, rc, result = -1; |
09ab3296 | 215 | |
216 | if (timeout <= 0) | |
217 | return (connect(sockfd, serv_addr, addrlen)); | |
218 | ||
2daf1db1 | 219 | set_nonblock(sockfd); |
09ab3296 | 220 | rc = connect(sockfd, serv_addr, addrlen); |
2daf1db1 | 221 | if (rc == 0) { |
222 | unset_nonblock(sockfd); | |
09ab3296 | 223 | return (0); |
2daf1db1 | 224 | } |
09ab3296 | 225 | if (errno != EINPROGRESS) |
226 | return (-1); | |
227 | ||
52e3daed | 228 | fdset = (fd_set *)xcalloc(howmany(sockfd + 1, NFDBITS), |
229 | sizeof(fd_mask)); | |
09ab3296 | 230 | FD_SET(sockfd, fdset); |
231 | tv.tv_sec = timeout; | |
232 | tv.tv_usec = 0; | |
233 | ||
f8cc7664 | 234 | for (;;) { |
09ab3296 | 235 | rc = select(sockfd + 1, NULL, fdset, NULL, &tv); |
236 | if (rc != -1 || errno != EINTR) | |
237 | break; | |
238 | } | |
239 | ||
f8cc7664 | 240 | switch (rc) { |
09ab3296 | 241 | case 0: |
242 | /* Timed out */ | |
243 | errno = ETIMEDOUT; | |
da54f5be | 244 | break; |
09ab3296 | 245 | case -1: |
246 | /* Select error */ | |
aff51935 | 247 | debug("select: %s", strerror(errno)); |
da54f5be | 248 | break; |
09ab3296 | 249 | case 1: |
250 | /* Completed or failed */ | |
251 | optval = 0; | |
252 | optlen = sizeof(optval); | |
aff51935 | 253 | if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval, |
ce26c02a | 254 | &optlen) == -1) { |
aff51935 | 255 | debug("getsockopt: %s", strerror(errno)); |
da54f5be | 256 | break; |
ce26c02a | 257 | } |
09ab3296 | 258 | if (optval != 0) { |
259 | errno = optval; | |
da54f5be | 260 | break; |
09ab3296 | 261 | } |
da54f5be | 262 | result = 0; |
2daf1db1 | 263 | unset_nonblock(sockfd); |
09ab3296 | 264 | break; |
265 | default: | |
266 | /* Should not occur */ | |
267 | fatal("Bogus return (%d) from select()", rc); | |
268 | } | |
269 | ||
da54f5be | 270 | xfree(fdset); |
271 | return (result); | |
09ab3296 | 272 | } |
273 | ||
5260325f | 274 | /* |
48e671d5 | 275 | * Opens a TCP/IP connection to the remote server on the given host. |
276 | * The address of the remote host will be returned in hostaddr. | |
3fb156df | 277 | * If port is 0, the default port will be used. If needpriv is true, |
5260325f | 278 | * a privileged port will be allocated to make the connection. |
3fb156df | 279 | * This requires super-user privileges if needpriv is true. |
5260325f | 280 | * Connection_attempts specifies the maximum number of tries (one per |
281 | * second). If proxy_command is non-NULL, it specifies the command (with %h | |
282 | * and %p substituted for host and port, respectively) to use to contact | |
283 | * the daemon. | |
284 | */ | |
285 | int | |
48e671d5 | 286 | ssh_connect(const char *host, struct sockaddr_storage * hostaddr, |
dab89049 | 287 | u_short port, int family, int connection_attempts, |
3fb156df | 288 | int needpriv, const char *proxy_command) |
8efc0c15 | 289 | { |
b5c334cc | 290 | int gaierr; |
291 | int on = 1; | |
48e671d5 | 292 | int sock = -1, attempt; |
48e671d5 | 293 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
b5c334cc | 294 | struct addrinfo hints, *ai, *aitop; |
5260325f | 295 | |
a77673cc | 296 | debug2("ssh_connect: needpriv %d", needpriv); |
5260325f | 297 | |
5260325f | 298 | /* If a proxy command is given, connect using it. */ |
299 | if (proxy_command != NULL) | |
3fb156df | 300 | return ssh_proxy_connect(host, port, proxy_command); |
5260325f | 301 | |
302 | /* No proxy command. */ | |
303 | ||
48e671d5 | 304 | memset(&hints, 0, sizeof(hints)); |
dab89049 | 305 | hints.ai_family = family; |
48e671d5 | 306 | hints.ai_socktype = SOCK_STREAM; |
d6133f43 | 307 | snprintf(strport, sizeof strport, "%u", port); |
48e671d5 | 308 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) |
309 | fatal("%s: %.100s: %s", __progname, host, | |
310 | gai_strerror(gaierr)); | |
5260325f | 311 | |
4439dde1 | 312 | for (attempt = 0; attempt < connection_attempts; attempt++) { |
5260325f | 313 | if (attempt > 0) |
314 | debug("Trying again..."); | |
315 | ||
4439dde1 | 316 | /* |
317 | * Loop through addresses for this host, and try each one in | |
318 | * sequence until the connection succeeds. | |
319 | */ | |
48e671d5 | 320 | for (ai = aitop; ai; ai = ai->ai_next) { |
321 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
322 | continue; | |
323 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, | |
324 | ntop, sizeof(ntop), strport, sizeof(strport), | |
325 | NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
326 | error("ssh_connect: getnameinfo failed"); | |
327 | continue; | |
328 | } | |
329 | debug("Connecting to %.200s [%.100s] port %s.", | |
330 | host, ntop, strport); | |
331 | ||
332 | /* Create a socket for connecting. */ | |
3e131a6d | 333 | sock = ssh_create_socket(needpriv, ai); |
48e671d5 | 334 | if (sock < 0) |
ce773142 | 335 | /* Any error is already output */ |
48e671d5 | 336 | continue; |
337 | ||
09ab3296 | 338 | if (timeout_connect(sock, ai->ai_addr, ai->ai_addrlen, |
339 | options.connection_timeout) >= 0) { | |
48e671d5 | 340 | /* Successful connection. */ |
cd332296 | 341 | memcpy(hostaddr, ai->ai_addr, ai->ai_addrlen); |
5260325f | 342 | break; |
48e671d5 | 343 | } else { |
c750d869 | 344 | debug("connect to address %s port %s: %s", |
345 | ntop, strport, strerror(errno)); | |
5260325f | 346 | close(sock); |
4439dde1 | 347 | sock = -1; |
5260325f | 348 | } |
8efc0c15 | 349 | } |
4439dde1 | 350 | if (sock != -1) |
48e671d5 | 351 | break; /* Successful connection. */ |
8efc0c15 | 352 | |
5260325f | 353 | /* Sleep a moment before retrying. */ |
354 | sleep(1); | |
355 | } | |
48e671d5 | 356 | |
357 | freeaddrinfo(aitop); | |
358 | ||
5260325f | 359 | /* Return failure if we didn't get a successful connection. */ |
4439dde1 | 360 | if (sock == -1) { |
cf039bd1 | 361 | error("ssh: connect to host %s port %s: %s", |
9bd68577 | 362 | host, strport, strerror(errno)); |
cf039bd1 | 363 | return (-1); |
9bd68577 | 364 | } |
8efc0c15 | 365 | |
5260325f | 366 | debug("Connection established."); |
8efc0c15 | 367 | |
fd573618 | 368 | /* Set SO_KEEPALIVE if requested. */ |
369 | if (options.tcp_keep_alive && | |
b5c334cc | 370 | setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, |
371 | sizeof(on)) < 0) | |
372 | error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno)); | |
8efc0c15 | 373 | |
5260325f | 374 | /* Set the connection. */ |
375 | packet_set_connection(sock, sock); | |
8efc0c15 | 376 | |
ce773142 | 377 | return 0; |
8efc0c15 | 378 | } |
379 | ||
5260325f | 380 | /* |
381 | * Waits for the server identification string, and sends our own | |
382 | * identification string. | |
383 | */ | |
396c147e | 384 | static void |
5ca51e19 | 385 | ssh_exchange_identification(void) |
8efc0c15 | 386 | { |
5260325f | 387 | char buf[256], remote_version[256]; /* must be same size! */ |
2ceb8101 | 388 | int remote_major, remote_minor, mismatch; |
5260325f | 389 | int connection_in = packet_get_connection_in(); |
390 | int connection_out = packet_get_connection_out(); | |
2b87da3b | 391 | int minor1 = PROTOCOL_MINOR_1; |
e5c76324 | 392 | u_int i, n; |
5260325f | 393 | |
05624c18 | 394 | /* Read other side's version identification. */ |
e5c76324 | 395 | for (n = 0;;) { |
38c295d6 | 396 | for (i = 0; i < sizeof(buf) - 1; i++) { |
05624c18 | 397 | size_t len = atomicio(read, connection_in, &buf[i], 1); |
398 | ||
56964485 | 399 | if (len != 1 && errno == EPIPE) |
38c295d6 | 400 | fatal("ssh_exchange_identification: Connection closed by remote host"); |
05624c18 | 401 | else if (len != 1) |
402 | fatal("ssh_exchange_identification: read: %.100s", strerror(errno)); | |
38c295d6 | 403 | if (buf[i] == '\r') { |
404 | buf[i] = '\n'; | |
405 | buf[i + 1] = 0; | |
406 | continue; /**XXX wait for \n */ | |
407 | } | |
408 | if (buf[i] == '\n') { | |
409 | buf[i + 1] = 0; | |
410 | break; | |
411 | } | |
e5c76324 | 412 | if (++n > 65536) |
413 | fatal("ssh_exchange_identification: No banner received"); | |
5260325f | 414 | } |
38c295d6 | 415 | buf[sizeof(buf) - 1] = 0; |
416 | if (strncmp(buf, "SSH-", 4) == 0) | |
5260325f | 417 | break; |
38c295d6 | 418 | debug("ssh_exchange_identification: %s", buf); |
8efc0c15 | 419 | } |
8ce64345 | 420 | server_version_string = xstrdup(buf); |
5260325f | 421 | |
aa3378df | 422 | /* |
423 | * Check that the versions match. In future this might accept | |
424 | * several versions and set appropriate flags to handle them. | |
425 | */ | |
8ce64345 | 426 | if (sscanf(server_version_string, "SSH-%d.%d-%[^\n]\n", |
427 | &remote_major, &remote_minor, remote_version) != 3) | |
5260325f | 428 | fatal("Bad remote protocol version identification: '%.100s'", buf); |
429 | debug("Remote protocol version %d.%d, remote software version %.100s", | |
184eed6a | 430 | remote_major, remote_minor, remote_version); |
5260325f | 431 | |
8ce64345 | 432 | compat_datafellows(remote_version); |
a8be9f80 | 433 | mismatch = 0; |
434 | ||
6aacefa7 | 435 | switch (remote_major) { |
a8be9f80 | 436 | case 1: |
437 | if (remote_minor == 99 && | |
438 | (options.protocol & SSH_PROTO_2) && | |
439 | !(options.protocol & SSH_PROTO_1_PREFERRED)) { | |
440 | enable_compat20(); | |
441 | break; | |
5260325f | 442 | } |
a8be9f80 | 443 | if (!(options.protocol & SSH_PROTO_1)) { |
444 | mismatch = 1; | |
445 | break; | |
446 | } | |
447 | if (remote_minor < 3) { | |
448 | fatal("Remote machine has too old SSH software version."); | |
fa08c86b | 449 | } else if (remote_minor == 3 || remote_minor == 4) { |
a8be9f80 | 450 | /* We speak 1.3, too. */ |
451 | enable_compat13(); | |
fa08c86b | 452 | minor1 = 3; |
a8be9f80 | 453 | if (options.forward_agent) { |
bbe88b6d | 454 | logit("Agent forwarding disabled for protocol 1.3"); |
a8be9f80 | 455 | options.forward_agent = 0; |
456 | } | |
457 | } | |
458 | break; | |
459 | case 2: | |
460 | if (options.protocol & SSH_PROTO_2) { | |
461 | enable_compat20(); | |
462 | break; | |
463 | } | |
464 | /* FALLTHROUGH */ | |
6ae2364d | 465 | default: |
a8be9f80 | 466 | mismatch = 1; |
467 | break; | |
8efc0c15 | 468 | } |
a8be9f80 | 469 | if (mismatch) |
5260325f | 470 | fatal("Protocol major versions differ: %d vs. %d", |
a8be9f80 | 471 | (options.protocol & SSH_PROTO_2) ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1, |
472 | remote_major); | |
5260325f | 473 | /* Send our own protocol version identification. */ |
474 | snprintf(buf, sizeof buf, "SSH-%d.%d-%.100s\n", | |
a8be9f80 | 475 | compat20 ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1, |
fa08c86b | 476 | compat20 ? PROTOCOL_MINOR_2 : minor1, |
8ce64345 | 477 | SSH_VERSION); |
dc54438a | 478 | if (atomicio(vwrite, connection_out, buf, strlen(buf)) != strlen(buf)) |
5260325f | 479 | fatal("write: %.100s", strerror(errno)); |
8ce64345 | 480 | client_version_string = xstrdup(buf); |
481 | chop(client_version_string); | |
482 | chop(server_version_string); | |
483 | debug("Local version string %.100s", client_version_string); | |
8efc0c15 | 484 | } |
485 | ||
f21032a6 | 486 | /* defaults to 'no' */ |
396c147e | 487 | static int |
a2c92c4a | 488 | confirm(const char *prompt) |
8efc0c15 | 489 | { |
616a6b93 | 490 | const char *msg, *again = "Please type 'yes' or 'no': "; |
491 | char *p; | |
492 | int ret = -1; | |
5260325f | 493 | |
f21032a6 | 494 | if (options.batch_mode) |
495 | return 0; | |
616a6b93 | 496 | for (msg = prompt;;msg = again) { |
497 | p = read_passphrase(msg, RP_ECHO); | |
498 | if (p == NULL || | |
499 | (p[0] == '\0') || (p[0] == '\n') || | |
500 | strncasecmp(p, "no", 2) == 0) | |
501 | ret = 0; | |
f11fe301 | 502 | if (p && strncasecmp(p, "yes", 3) == 0) |
616a6b93 | 503 | ret = 1; |
504 | if (p) | |
505 | xfree(p); | |
506 | if (ret != -1) | |
507 | return ret; | |
8efc0c15 | 508 | } |
8efc0c15 | 509 | } |
510 | ||
5260325f | 511 | /* |
f49bc4f7 | 512 | * check whether the supplied host key is valid, return -1 if the key |
513 | * is not valid. the user_hostfile will not be updated if 'readonly' is true. | |
5260325f | 514 | */ |
396c147e | 515 | static int |
a306f2dd | 516 | check_host_key(char *host, struct sockaddr *hostaddr, Key *host_key, |
f49bc4f7 | 517 | int readonly, const char *user_hostfile, const char *system_hostfile) |
8efc0c15 | 518 | { |
4fe2af09 | 519 | Key *file_key; |
b6c7b7b7 | 520 | const char *type = key_type(host_key); |
95f1eccc | 521 | char *ip = NULL; |
22138a36 | 522 | char hostline[1000], *hostp, *fp; |
5260325f | 523 | HostStatus host_status; |
524 | HostStatus ip_status; | |
e79276c2 | 525 | int r, local = 0, host_ip_differ = 0; |
20af321f | 526 | int salen; |
48e671d5 | 527 | char ntop[NI_MAXHOST]; |
616a6b93 | 528 | char msg[1024]; |
1432b5c4 | 529 | int len, host_line, ip_line; |
1e3b8b07 | 530 | const char *host_file = NULL, *ip_file = NULL; |
48e671d5 | 531 | |
532 | /* | |
533 | * Force accepting of the host key for loopback/localhost. The | |
534 | * problem is that if the home directory is NFS-mounted to multiple | |
535 | * machines, localhost will refer to a different machine in each of | |
536 | * them, and the user will get bogus HOST_CHANGED warnings. This | |
537 | * essentially disables host authentication for localhost; however, | |
538 | * this is probably not a real problem. | |
539 | */ | |
a306f2dd | 540 | /** hostaddr == 0! */ |
48e671d5 | 541 | switch (hostaddr->sa_family) { |
542 | case AF_INET: | |
f49bc4f7 | 543 | local = (ntohl(((struct sockaddr_in *)hostaddr)-> |
4e2e5cfd | 544 | sin_addr.s_addr) >> 24) == IN_LOOPBACKNET; |
20af321f | 545 | salen = sizeof(struct sockaddr_in); |
48e671d5 | 546 | break; |
547 | case AF_INET6: | |
f49bc4f7 | 548 | local = IN6_IS_ADDR_LOOPBACK( |
549 | &(((struct sockaddr_in6 *)hostaddr)->sin6_addr)); | |
20af321f | 550 | salen = sizeof(struct sockaddr_in6); |
48e671d5 | 551 | break; |
552 | default: | |
553 | local = 0; | |
20af321f | 554 | salen = sizeof(struct sockaddr_storage); |
48e671d5 | 555 | break; |
556 | } | |
8bbc048a | 557 | if (options.no_host_authentication_for_localhost == 1 && local && |
558 | options.host_key_alias == NULL) { | |
7c49df64 | 559 | debug("Forcing accepting of host key for " |
560 | "loopback/localhost."); | |
f49bc4f7 | 561 | return 0; |
48e671d5 | 562 | } |
5260325f | 563 | |
57112b5a | 564 | /* |
7c49df64 | 565 | * We don't have the remote ip-address for connections |
566 | * using a proxy command | |
567 | */ | |
568 | if (options.proxy_command == NULL) { | |
569 | if (getnameinfo(hostaddr, salen, ntop, sizeof(ntop), | |
570 | NULL, 0, NI_NUMERICHOST) != 0) | |
571 | fatal("check_host_key: getnameinfo failed"); | |
572 | ip = xstrdup(ntop); | |
573 | } else { | |
574 | ip = xstrdup("<no hostip for proxy command>"); | |
575 | } | |
576 | /* | |
577 | * Turn off check_host_ip if the connection is to localhost, via proxy | |
578 | * command or if we don't have a hostname to compare with | |
57112b5a | 579 | */ |
7c49df64 | 580 | if (options.check_host_ip && |
581 | (local || strcmp(host, ip) == 0 || options.proxy_command != NULL)) | |
57112b5a | 582 | options.check_host_ip = 0; |
583 | ||
8abcdba4 | 584 | /* |
7c49df64 | 585 | * Allow the user to record the key under a different name. This is |
8abcdba4 | 586 | * useful for ssh tunneling over forwarded connections or if you run |
7c49df64 | 587 | * multiple sshd's on different ports on the same machine. |
8abcdba4 | 588 | */ |
589 | if (options.host_key_alias != NULL) { | |
590 | host = options.host_key_alias; | |
591 | debug("using hostkeyalias: %s", host); | |
592 | } | |
593 | ||
95f1eccc | 594 | /* |
595 | * Store the host key from the known host file in here so that we can | |
596 | * compare it with the key for the IP address. | |
597 | */ | |
4fe2af09 | 598 | file_key = key_new(host_key->type); |
5260325f | 599 | |
aa3378df | 600 | /* |
7b9b0103 | 601 | * Check if the host key is present in the user's list of known |
aa3378df | 602 | * hosts or in the systemwide list. |
603 | */ | |
1e3b8b07 | 604 | host_file = user_hostfile; |
f49bc4f7 | 605 | host_status = check_host_in_hostfile(host_file, host, host_key, |
184eed6a | 606 | file_key, &host_line); |
1e3b8b07 | 607 | if (host_status == HOST_NEW) { |
608 | host_file = system_hostfile; | |
f49bc4f7 | 609 | host_status = check_host_in_hostfile(host_file, host, host_key, |
610 | file_key, &host_line); | |
1e3b8b07 | 611 | } |
aa3378df | 612 | /* |
613 | * Also perform check for the ip address, skip the check if we are | |
614 | * localhost or the hostname was an ip address to begin with | |
615 | */ | |
7c49df64 | 616 | if (options.check_host_ip) { |
4fe2af09 | 617 | Key *ip_key = key_new(host_key->type); |
5260325f | 618 | |
1e3b8b07 | 619 | ip_file = user_hostfile; |
f49bc4f7 | 620 | ip_status = check_host_in_hostfile(ip_file, ip, host_key, |
621 | ip_key, &ip_line); | |
1e3b8b07 | 622 | if (ip_status == HOST_NEW) { |
623 | ip_file = system_hostfile; | |
f49bc4f7 | 624 | ip_status = check_host_in_hostfile(ip_file, ip, |
625 | host_key, ip_key, &ip_line); | |
1e3b8b07 | 626 | } |
5260325f | 627 | if (host_status == HOST_CHANGED && |
4fe2af09 | 628 | (ip_status != HOST_CHANGED || !key_equal(ip_key, file_key))) |
5260325f | 629 | host_ip_differ = 1; |
630 | ||
4fe2af09 | 631 | key_free(ip_key); |
5260325f | 632 | } else |
633 | ip_status = host_status; | |
634 | ||
4fe2af09 | 635 | key_free(file_key); |
5260325f | 636 | |
637 | switch (host_status) { | |
638 | case HOST_OK: | |
639 | /* The host is known and the key matches. */ | |
1d1ffb87 | 640 | debug("Host '%.200s' is known and matches the %s host key.", |
641 | host, type); | |
1e3b8b07 | 642 | debug("Found key in %s:%d", host_file, host_line); |
7c49df64 | 643 | if (options.check_host_ip && ip_status == HOST_NEW) { |
f49bc4f7 | 644 | if (readonly) |
bbe88b6d | 645 | logit("%s host key for IP address " |
f49bc4f7 | 646 | "'%.128s' not in list of known hosts.", |
7c49df64 | 647 | type, ip); |
f49bc4f7 | 648 | else if (!add_host_to_hostfile(user_hostfile, ip, |
5c63c2ab | 649 | host_key, options.hash_known_hosts)) |
bbe88b6d | 650 | logit("Failed to add the %s host key for IP " |
f49bc4f7 | 651 | "address '%.128s' to the list of known " |
652 | "hosts (%.30s).", type, ip, user_hostfile); | |
653 | else | |
bbe88b6d | 654 | logit("Warning: Permanently added the %s host " |
f49bc4f7 | 655 | "key for IP address '%.128s' to the list " |
656 | "of known hosts.", type, ip); | |
5260325f | 657 | } |
658 | break; | |
659 | case HOST_NEW: | |
f49bc4f7 | 660 | if (readonly) |
661 | goto fail; | |
5260325f | 662 | /* The host is new. */ |
663 | if (options.strict_host_key_checking == 1) { | |
f49bc4f7 | 664 | /* |
665 | * User has requested strict host key checking. We | |
666 | * will not add the host key automatically. The only | |
667 | * alternative left is to abort. | |
668 | */ | |
669 | error("No %s host key is known for %.200s and you " | |
670 | "have requested strict checking.", type, host); | |
671 | goto fail; | |
5260325f | 672 | } else if (options.strict_host_key_checking == 2) { |
1432b5c4 | 673 | char msg1[1024], msg2[1024]; |
674 | ||
675 | if (show_other_keys(host, host_key)) | |
676 | snprintf(msg1, sizeof(msg1), | |
4e2e5cfd | 677 | "\nbut keys of different type are already" |
678 | " known for this host."); | |
1432b5c4 | 679 | else |
680 | snprintf(msg1, sizeof(msg1), "."); | |
5260325f | 681 | /* The default */ |
22138a36 | 682 | fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX); |
1432b5c4 | 683 | msg2[0] = '\0'; |
1432b5c4 | 684 | if (options.verify_host_key_dns) { |
0161a13d | 685 | if (matching_host_key_dns) |
1432b5c4 | 686 | snprintf(msg2, sizeof(msg2), |
687 | "Matching host key fingerprint" | |
688 | " found in DNS.\n"); | |
689 | else | |
690 | snprintf(msg2, sizeof(msg2), | |
691 | "No matching host key fingerprint" | |
692 | " found in DNS.\n"); | |
693 | } | |
616a6b93 | 694 | snprintf(msg, sizeof(msg), |
f49bc4f7 | 695 | "The authenticity of host '%.200s (%s)' can't be " |
8a48a7ef | 696 | "established%s\n" |
1432b5c4 | 697 | "%s key fingerprint is %s.\n%s" |
f49bc4f7 | 698 | "Are you sure you want to continue connecting " |
8a48a7ef | 699 | "(yes/no)? ", |
1432b5c4 | 700 | host, ip, msg1, type, fp, msg2); |
22138a36 | 701 | xfree(fp); |
616a6b93 | 702 | if (!confirm(msg)) |
f49bc4f7 | 703 | goto fail; |
5260325f | 704 | } |
f49bc4f7 | 705 | /* |
706 | * If not in strict mode, add the key automatically to the | |
707 | * local known_hosts file. | |
708 | */ | |
e79276c2 | 709 | if (options.check_host_ip && ip_status == HOST_NEW) { |
710 | snprintf(hostline, sizeof(hostline), "%s,%s", | |
711 | host, ip); | |
712 | hostp = hostline; | |
713 | if (options.hash_known_hosts) { | |
714 | /* Add hash of host and IP separately */ | |
715 | r = add_host_to_hostfile(user_hostfile, host, | |
716 | host_key, options.hash_known_hosts) && | |
717 | add_host_to_hostfile(user_hostfile, ip, | |
718 | host_key, options.hash_known_hosts); | |
719 | } else { | |
720 | /* Add unhashed "host,ip" */ | |
721 | r = add_host_to_hostfile(user_hostfile, | |
722 | hostline, host_key, | |
723 | options.hash_known_hosts); | |
724 | } | |
725 | } else { | |
726 | r = add_host_to_hostfile(user_hostfile, host, host_key, | |
727 | options.hash_known_hosts); | |
728 | hostp = host; | |
729 | } | |
730 | ||
731 | if (!r) | |
bbe88b6d | 732 | logit("Failed to add the host to the list of known " |
f49bc4f7 | 733 | "hosts (%.500s).", user_hostfile); |
5260325f | 734 | else |
bbe88b6d | 735 | logit("Warning: Permanently added '%.200s' (%s) to the " |
f49bc4f7 | 736 | "list of known hosts.", hostp, type); |
5260325f | 737 | break; |
738 | case HOST_CHANGED: | |
739 | if (options.check_host_ip && host_ip_differ) { | |
ca75d7de | 740 | char *key_msg; |
5260325f | 741 | if (ip_status == HOST_NEW) |
ca75d7de | 742 | key_msg = "is unknown"; |
5260325f | 743 | else if (ip_status == HOST_OK) |
ca75d7de | 744 | key_msg = "is unchanged"; |
5260325f | 745 | else |
ca75d7de | 746 | key_msg = "has a different value"; |
5260325f | 747 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
748 | error("@ WARNING: POSSIBLE DNS SPOOFING DETECTED! @"); | |
749 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
1d1ffb87 | 750 | error("The %s host key for %s has changed,", type, host); |
5260325f | 751 | error("and the key for the according IP address %s", ip); |
ca75d7de | 752 | error("%s. This could either mean that", key_msg); |
5260325f | 753 | error("DNS SPOOFING is happening or the IP address for the host"); |
1e3b8b07 | 754 | error("and its host key have changed at the same time."); |
7c49df64 | 755 | if (ip_status != HOST_NEW) |
1e3b8b07 | 756 | error("Offending key for IP in %s:%d", ip_file, ip_line); |
5260325f | 757 | } |
758 | /* The host key has changed. */ | |
1a1bc5d5 | 759 | warn_changed_key(host_key); |
5260325f | 760 | error("Add correct host key in %.100s to get rid of this message.", |
8abcdba4 | 761 | user_hostfile); |
1e3b8b07 | 762 | error("Offending key in %s:%d", host_file, host_line); |
5260325f | 763 | |
aa3378df | 764 | /* |
765 | * If strict host key checking is in use, the user will have | |
766 | * to edit the key manually and we can only abort. | |
767 | */ | |
f49bc4f7 | 768 | if (options.strict_host_key_checking) { |
769 | error("%s host key for %.200s has changed and you have " | |
770 | "requested strict checking.", type, host); | |
771 | goto fail; | |
772 | } | |
5260325f | 773 | |
aa3378df | 774 | /* |
775 | * If strict host key checking has not been requested, allow | |
d453a600 | 776 | * the connection but without MITM-able authentication or |
aa3378df | 777 | * agent forwarding. |
778 | */ | |
5260325f | 779 | if (options.password_authentication) { |
f49bc4f7 | 780 | error("Password authentication is disabled to avoid " |
781 | "man-in-the-middle attacks."); | |
5260325f | 782 | options.password_authentication = 0; |
783 | } | |
d453a600 | 784 | if (options.kbd_interactive_authentication) { |
785 | error("Keyboard-interactive authentication is disabled" | |
786 | " to avoid man-in-the-middle attacks."); | |
787 | options.kbd_interactive_authentication = 0; | |
788 | options.challenge_response_authentication = 0; | |
789 | } | |
790 | if (options.challenge_response_authentication) { | |
791 | error("Challenge/response authentication is disabled" | |
792 | " to avoid man-in-the-middle attacks."); | |
793 | options.challenge_response_authentication = 0; | |
794 | } | |
5260325f | 795 | if (options.forward_agent) { |
f49bc4f7 | 796 | error("Agent forwarding is disabled to avoid " |
797 | "man-in-the-middle attacks."); | |
5260325f | 798 | options.forward_agent = 0; |
799 | } | |
0b6fbf03 | 800 | if (options.forward_x11) { |
f49bc4f7 | 801 | error("X11 forwarding is disabled to avoid " |
802 | "man-in-the-middle attacks."); | |
0b6fbf03 | 803 | options.forward_x11 = 0; |
804 | } | |
f49bc4f7 | 805 | if (options.num_local_forwards > 0 || |
806 | options.num_remote_forwards > 0) { | |
807 | error("Port forwarding is disabled to avoid " | |
808 | "man-in-the-middle attacks."); | |
809 | options.num_local_forwards = | |
184eed6a | 810 | options.num_remote_forwards = 0; |
0b6fbf03 | 811 | } |
aa3378df | 812 | /* |
813 | * XXX Should permit the user to change to use the new id. | |
814 | * This could be done by converting the host key to an | |
815 | * identifying sentence, tell that the host identifies itself | |
816 | * by that sentence, and ask the user if he/she whishes to | |
817 | * accept the authentication. | |
818 | */ | |
5260325f | 819 | break; |
8a48a7ef | 820 | case HOST_FOUND: |
821 | fatal("internal error"); | |
822 | break; | |
5260325f | 823 | } |
0b6fbf03 | 824 | |
7c49df64 | 825 | if (options.check_host_ip && host_status != HOST_CHANGED && |
826 | ip_status == HOST_CHANGED) { | |
616a6b93 | 827 | snprintf(msg, sizeof(msg), |
828 | "Warning: the %s host key for '%.200s' " | |
829 | "differs from the key for the IP address '%.128s'" | |
830 | "\nOffending key for IP in %s:%d", | |
831 | type, host, ip, ip_file, ip_line); | |
832 | if (host_status == HOST_OK) { | |
833 | len = strlen(msg); | |
834 | snprintf(msg + len, sizeof(msg) - len, | |
835 | "\nMatching host key in %s:%d", | |
7203d6bb | 836 | host_file, host_line); |
616a6b93 | 837 | } |
7c49df64 | 838 | if (options.strict_host_key_checking == 1) { |
b0545fe6 | 839 | logit("%s", msg); |
f49bc4f7 | 840 | error("Exiting, you have requested strict checking."); |
841 | goto fail; | |
7c49df64 | 842 | } else if (options.strict_host_key_checking == 2) { |
616a6b93 | 843 | strlcat(msg, "\nAre you sure you want " |
844 | "to continue connecting (yes/no)? ", sizeof(msg)); | |
845 | if (!confirm(msg)) | |
f49bc4f7 | 846 | goto fail; |
616a6b93 | 847 | } else { |
b0545fe6 | 848 | logit("%s", msg); |
7c49df64 | 849 | } |
850 | } | |
851 | ||
0b6fbf03 | 852 | xfree(ip); |
f49bc4f7 | 853 | return 0; |
854 | ||
855 | fail: | |
856 | xfree(ip); | |
857 | return -1; | |
858 | } | |
859 | ||
21289cd0 | 860 | /* returns 0 if key verifies or -1 if key does NOT verify */ |
f49bc4f7 | 861 | int |
862 | verify_host_key(char *host, struct sockaddr *hostaddr, Key *host_key) | |
863 | { | |
864 | struct stat st; | |
0161a13d | 865 | int flags = 0; |
f49bc4f7 | 866 | |
0161a13d | 867 | if (options.verify_host_key_dns && |
868 | verify_host_key_dns(host, hostaddr, host_key, &flags) == 0) { | |
869 | ||
870 | if (flags & DNS_VERIFY_FOUND) { | |
871 | ||
872 | if (options.verify_host_key_dns == 1 && | |
873 | flags & DNS_VERIFY_MATCH && | |
874 | flags & DNS_VERIFY_SECURE) | |
875 | return 0; | |
876 | ||
877 | if (flags & DNS_VERIFY_MATCH) { | |
878 | matching_host_key_dns = 1; | |
879 | } else { | |
880 | warn_changed_key(host_key); | |
881 | error("Update the SSHFP RR in DNS with the new " | |
882 | "host key to get rid of this message."); | |
883 | } | |
21289cd0 | 884 | } |
885 | } | |
21289cd0 | 886 | |
f49bc4f7 | 887 | /* return ok if the key can be found in an old keyfile */ |
888 | if (stat(options.system_hostfile2, &st) == 0 || | |
889 | stat(options.user_hostfile2, &st) == 0) { | |
890 | if (check_host_key(host, hostaddr, host_key, /*readonly*/ 1, | |
891 | options.user_hostfile2, options.system_hostfile2) == 0) | |
892 | return 0; | |
893 | } | |
894 | return check_host_key(host, hostaddr, host_key, /*readonly*/ 0, | |
895 | options.user_hostfile, options.system_hostfile); | |
95f1eccc | 896 | } |
897 | ||
8ce64345 | 898 | /* |
a306f2dd | 899 | * Starts a dialog with the server, and authenticates the current user on the |
900 | * server. This does not need any extra privileges. The basic connection | |
901 | * to the server must already have been established before this is called. | |
902 | * If login fails, this function prints an error and never returns. | |
903 | * This function does not require super-user privileges. | |
8ce64345 | 904 | */ |
905 | void | |
39c00dc2 | 906 | ssh_login(Sensitive *sensitive, const char *orighost, |
63bd8c36 | 907 | struct sockaddr *hostaddr, struct passwd *pw) |
8ce64345 | 908 | { |
a306f2dd | 909 | char *host, *cp; |
8ce64345 | 910 | char *server_user, *local_user; |
8ce64345 | 911 | |
8ce64345 | 912 | local_user = xstrdup(pw->pw_name); |
913 | server_user = options.user ? options.user : local_user; | |
914 | ||
7b2ea3a1 | 915 | /* Convert the user-supplied hostname into all lowercase. */ |
916 | host = xstrdup(orighost); | |
917 | for (cp = host; *cp; cp++) | |
918 | if (isupper(*cp)) | |
9555d258 | 919 | *cp = (char)tolower(*cp); |
7b2ea3a1 | 920 | |
921 | /* Exchange protocol version identification strings with the server. */ | |
922 | ssh_exchange_identification(); | |
923 | ||
924 | /* Put the connection into non-blocking mode. */ | |
925 | packet_set_nonblocking(); | |
926 | ||
7b2ea3a1 | 927 | /* key exchange */ |
7b2ea3a1 | 928 | /* authenticate user */ |
8ce64345 | 929 | if (compat20) { |
930 | ssh_kex2(host, hostaddr); | |
39c00dc2 | 931 | ssh_userauth2(local_user, server_user, host, sensitive); |
8ce64345 | 932 | } else { |
8ce64345 | 933 | ssh_kex(host, hostaddr); |
39c00dc2 | 934 | ssh_userauth1(local_user, server_user, host, sensitive); |
8ce64345 | 935 | } |
2b8dc5e3 | 936 | xfree(local_user); |
7b2ea3a1 | 937 | } |
0ae4fe1d | 938 | |
939 | void | |
940 | ssh_put_password(char *password) | |
941 | { | |
942 | int size; | |
943 | char *padded; | |
944 | ||
99c415db | 945 | if (datafellows & SSH_BUG_PASSWORDPAD) { |
449c5ba5 | 946 | packet_put_cstring(password); |
99c415db | 947 | return; |
948 | } | |
0ae4fe1d | 949 | size = roundup(strlen(password) + 1, 32); |
52e3daed | 950 | padded = xcalloc(1, size); |
0ae4fe1d | 951 | strlcpy(padded, password, size); |
952 | packet_put_string(padded, size); | |
953 | memset(padded, 0, size); | |
954 | xfree(padded); | |
955 | } | |
8a48a7ef | 956 | |
957 | static int | |
958 | show_key_from_file(const char *file, const char *host, int keytype) | |
959 | { | |
960 | Key *found; | |
961 | char *fp; | |
962 | int line, ret; | |
963 | ||
964 | found = key_new(keytype); | |
965 | if ((ret = lookup_key_in_hostfile_by_type(file, host, | |
966 | keytype, found, &line))) { | |
967 | fp = key_fingerprint(found, SSH_FP_MD5, SSH_FP_HEX); | |
bbe88b6d | 968 | logit("WARNING: %s key found for host %s\n" |
567a05bf | 969 | "in %s:%d\n" |
8a48a7ef | 970 | "%s key fingerprint %s.", |
971 | key_type(found), host, file, line, | |
972 | key_type(found), fp); | |
973 | xfree(fp); | |
974 | } | |
975 | key_free(found); | |
976 | return (ret); | |
977 | } | |
978 | ||
979 | /* print all known host keys for a given host, but skip keys of given type */ | |
980 | static int | |
981 | show_other_keys(const char *host, Key *key) | |
982 | { | |
983 | int type[] = { KEY_RSA1, KEY_RSA, KEY_DSA, -1}; | |
984 | int i, found = 0; | |
985 | ||
986 | for (i = 0; type[i] != -1; i++) { | |
987 | if (type[i] == key->type) | |
988 | continue; | |
989 | if (type[i] != KEY_RSA1 && | |
990 | show_key_from_file(options.user_hostfile2, host, type[i])) { | |
991 | found = 1; | |
992 | continue; | |
993 | } | |
994 | if (type[i] != KEY_RSA1 && | |
995 | show_key_from_file(options.system_hostfile2, host, type[i])) { | |
996 | found = 1; | |
997 | continue; | |
998 | } | |
999 | if (show_key_from_file(options.user_hostfile, host, type[i])) { | |
1000 | found = 1; | |
1001 | continue; | |
1002 | } | |
1003 | if (show_key_from_file(options.system_hostfile, host, type[i])) { | |
1004 | found = 1; | |
1005 | continue; | |
1006 | } | |
1007 | debug2("no key of type %d for host %s", type[i], host); | |
1008 | } | |
1009 | return (found); | |
1010 | } | |
1a1bc5d5 | 1011 | |
1012 | static void | |
1013 | warn_changed_key(Key *host_key) | |
1014 | { | |
1015 | char *fp; | |
f5da7f70 | 1016 | const char *type = key_type(host_key); |
1a1bc5d5 | 1017 | |
1018 | fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX); | |
1019 | ||
1020 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
1021 | error("@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @"); | |
1022 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
1023 | error("IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!"); | |
1024 | error("Someone could be eavesdropping on you right now (man-in-the-middle attack)!"); | |
1025 | error("It is also possible that the %s host key has just been changed.", type); | |
1026 | error("The fingerprint for the %s key sent by the remote host is\n%s.", | |
1027 | type, fp); | |
1028 | error("Please contact your system administrator."); | |
1029 | ||
1030 | xfree(fp); | |
1a1bc5d5 | 1031 | } |
d20f3c9e | 1032 | |
1033 | /* | |
1034 | * Execute a local command | |
1035 | */ | |
1036 | int | |
1037 | ssh_local_cmd(const char *args) | |
1038 | { | |
1039 | char *shell; | |
1040 | pid_t pid; | |
1041 | int status; | |
1042 | ||
1043 | if (!options.permit_local_command || | |
1044 | args == NULL || !*args) | |
1045 | return (1); | |
1046 | ||
1047 | if ((shell = getenv("SHELL")) == NULL) | |
1048 | shell = _PATH_BSHELL; | |
1049 | ||
1050 | pid = fork(); | |
1051 | if (pid == 0) { | |
1052 | debug3("Executing %s -c \"%s\"", shell, args); | |
1053 | execl(shell, shell, "-c", args, (char *)NULL); | |
1054 | error("Couldn't execute %s -c \"%s\": %s", | |
1055 | shell, args, strerror(errno)); | |
1056 | _exit(1); | |
1057 | } else if (pid == -1) | |
1058 | fatal("fork failed: %.100s", strerror(errno)); | |
1059 | while (waitpid(pid, &status, 0) == -1) | |
1060 | if (errno != EINTR) | |
1061 | fatal("Couldn't wait for child: %s", strerror(errno)); | |
1062 | ||
1063 | if (!WIFEXITED(status)) | |
1064 | return (1); | |
1065 | ||
1066 | return (WEXITSTATUS(status)); | |
1067 | } |