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Commit | Line | Data |
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8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5260325f | 5 | * Code to connect to a remote host, and to perform the client side of the |
6 | * login (authentication) dialog. | |
bcbf86ec | 7 | * |
8 | * As far as I am concerned, the code I have written for this software | |
9 | * can be used freely for any purpose. Any derived versions of this | |
10 | * software must be clearly marked as such, and if the derived work is | |
11 | * incompatible with the protocol description in the RFC file, it must be | |
12 | * called by a name other than "ssh" or "Secure Shell". | |
5260325f | 13 | */ |
8efc0c15 | 14 | |
15 | #include "includes.h" | |
aa2eae64 | 16 | |
17 | #include <sys/types.h> | |
18 | #include <sys/wait.h> | |
4095f623 | 19 | #include <sys/stat.h> |
a75f5360 | 20 | |
b6438382 | 21 | #include <ctype.h> |
b5b88c19 | 22 | #ifdef HAVE_PATHS_H |
a75f5360 | 23 | #include <paths.h> |
b5b88c19 | 24 | #endif |
8efc0c15 | 25 | |
42f11eb2 | 26 | #include "ssh.h" |
8efc0c15 | 27 | #include "xmalloc.h" |
28 | #include "rsa.h" | |
8ce64345 | 29 | #include "buffer.h" |
8efc0c15 | 30 | #include "packet.h" |
8efc0c15 | 31 | #include "uidswap.h" |
32 | #include "compat.h" | |
4fe2af09 | 33 | #include "key.h" |
a306f2dd | 34 | #include "sshconnect.h" |
4fe2af09 | 35 | #include "hostfile.h" |
42f11eb2 | 36 | #include "log.h" |
37 | #include "readconf.h" | |
38 | #include "atomicio.h" | |
39 | #include "misc.h" | |
21289cd0 | 40 | #include "dns.h" |
21289cd0 | 41 | |
a306f2dd | 42 | char *client_version_string = NULL; |
43 | char *server_version_string = NULL; | |
8ce64345 | 44 | |
ed82a2a9 | 45 | static int matching_host_key_dns = 0; |
1432b5c4 | 46 | |
3fb156df | 47 | /* import */ |
57112b5a | 48 | extern Options options; |
48e671d5 | 49 | extern char *__progname; |
3fb156df | 50 | extern uid_t original_real_uid; |
51 | extern uid_t original_effective_uid; | |
6939bbd4 | 52 | extern pid_t proxy_command_pid; |
57112b5a | 53 | |
a704dd54 | 54 | #ifndef INET6_ADDRSTRLEN /* for non IPv6 machines */ |
55 | #define INET6_ADDRSTRLEN 46 | |
56 | #endif | |
57 | ||
8a48a7ef | 58 | static int show_other_keys(const char *, Key *); |
1a1bc5d5 | 59 | static void warn_changed_key(Key *); |
8a48a7ef | 60 | |
5260325f | 61 | /* |
62 | * Connect to the given ssh server using a proxy command. | |
63 | */ | |
396c147e | 64 | static int |
3fb156df | 65 | ssh_proxy_connect(const char *host, u_short port, const char *proxy_command) |
8efc0c15 | 66 | { |
a980cbd7 | 67 | char *command_string, *tmp; |
5260325f | 68 | int pin[2], pout[2]; |
9da5c3c9 | 69 | pid_t pid; |
48e671d5 | 70 | char strport[NI_MAXSERV]; |
a980cbd7 | 71 | size_t len; |
5260325f | 72 | |
73 | /* Convert the port number into a string. */ | |
48e671d5 | 74 | snprintf(strport, sizeof strport, "%hu", port); |
5260325f | 75 | |
6939bbd4 | 76 | /* |
77 | * Build the final command string in the buffer by making the | |
78 | * appropriate substitutions to the given proxy command. | |
79 | * | |
aff51935 | 80 | * Use "exec" to avoid "sh -c" processes on some platforms |
6939bbd4 | 81 | * (e.g. Solaris) |
82 | */ | |
a980cbd7 | 83 | len = strlen(proxy_command) + 6; |
84 | tmp = xmalloc(len); | |
85 | strlcpy(tmp, "exec ", len); | |
86 | strlcat(tmp, proxy_command, len); | |
87 | command_string = percent_expand(tmp, "h", host, | |
88 | "p", strport, (char *)NULL); | |
89 | xfree(tmp); | |
5260325f | 90 | |
91 | /* Create pipes for communicating with the proxy. */ | |
92 | if (pipe(pin) < 0 || pipe(pout) < 0) | |
93 | fatal("Could not create pipes to communicate with the proxy: %.100s", | |
184eed6a | 94 | strerror(errno)); |
5260325f | 95 | |
96 | debug("Executing proxy command: %.500s", command_string); | |
97 | ||
98 | /* Fork and execute the proxy command. */ | |
99 | if ((pid = fork()) == 0) { | |
100 | char *argv[10]; | |
101 | ||
102 | /* Child. Permanently give up superuser privileges. */ | |
3fb156df | 103 | seteuid(original_real_uid); |
104 | setuid(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; | |
da54f5be | 214 | int fdsetsz, 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 | ||
228 | fdsetsz = howmany(sockfd + 1, NFDBITS) * sizeof(fd_mask); | |
229 | fdset = (fd_set *)xmalloc(fdsetsz); | |
230 | ||
7caca6d4 | 231 | memset(fdset, 0, fdsetsz); |
09ab3296 | 232 | FD_SET(sockfd, fdset); |
233 | tv.tv_sec = timeout; | |
234 | tv.tv_usec = 0; | |
235 | ||
f8cc7664 | 236 | for (;;) { |
09ab3296 | 237 | rc = select(sockfd + 1, NULL, fdset, NULL, &tv); |
238 | if (rc != -1 || errno != EINTR) | |
239 | break; | |
240 | } | |
241 | ||
f8cc7664 | 242 | switch (rc) { |
09ab3296 | 243 | case 0: |
244 | /* Timed out */ | |
245 | errno = ETIMEDOUT; | |
da54f5be | 246 | break; |
09ab3296 | 247 | case -1: |
248 | /* Select error */ | |
aff51935 | 249 | debug("select: %s", strerror(errno)); |
da54f5be | 250 | break; |
09ab3296 | 251 | case 1: |
252 | /* Completed or failed */ | |
253 | optval = 0; | |
254 | optlen = sizeof(optval); | |
aff51935 | 255 | if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval, |
ce26c02a | 256 | &optlen) == -1) { |
aff51935 | 257 | debug("getsockopt: %s", strerror(errno)); |
da54f5be | 258 | break; |
ce26c02a | 259 | } |
09ab3296 | 260 | if (optval != 0) { |
261 | errno = optval; | |
da54f5be | 262 | break; |
09ab3296 | 263 | } |
da54f5be | 264 | result = 0; |
2daf1db1 | 265 | unset_nonblock(sockfd); |
09ab3296 | 266 | break; |
267 | default: | |
268 | /* Should not occur */ | |
269 | fatal("Bogus return (%d) from select()", rc); | |
270 | } | |
271 | ||
da54f5be | 272 | xfree(fdset); |
273 | return (result); | |
09ab3296 | 274 | } |
275 | ||
5260325f | 276 | /* |
48e671d5 | 277 | * Opens a TCP/IP connection to the remote server on the given host. |
278 | * The address of the remote host will be returned in hostaddr. | |
3fb156df | 279 | * If port is 0, the default port will be used. If needpriv is true, |
5260325f | 280 | * a privileged port will be allocated to make the connection. |
3fb156df | 281 | * This requires super-user privileges if needpriv is true. |
5260325f | 282 | * Connection_attempts specifies the maximum number of tries (one per |
283 | * second). If proxy_command is non-NULL, it specifies the command (with %h | |
284 | * and %p substituted for host and port, respectively) to use to contact | |
285 | * the daemon. | |
286 | */ | |
287 | int | |
48e671d5 | 288 | ssh_connect(const char *host, struct sockaddr_storage * hostaddr, |
dab89049 | 289 | u_short port, int family, int connection_attempts, |
3fb156df | 290 | int needpriv, const char *proxy_command) |
8efc0c15 | 291 | { |
b5c334cc | 292 | int gaierr; |
293 | int on = 1; | |
48e671d5 | 294 | int sock = -1, attempt; |
48e671d5 | 295 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
b5c334cc | 296 | struct addrinfo hints, *ai, *aitop; |
5260325f | 297 | |
a77673cc | 298 | debug2("ssh_connect: needpriv %d", needpriv); |
5260325f | 299 | |
5260325f | 300 | /* If a proxy command is given, connect using it. */ |
301 | if (proxy_command != NULL) | |
3fb156df | 302 | return ssh_proxy_connect(host, port, proxy_command); |
5260325f | 303 | |
304 | /* No proxy command. */ | |
305 | ||
48e671d5 | 306 | memset(&hints, 0, sizeof(hints)); |
dab89049 | 307 | hints.ai_family = family; |
48e671d5 | 308 | hints.ai_socktype = SOCK_STREAM; |
d6133f43 | 309 | snprintf(strport, sizeof strport, "%u", port); |
48e671d5 | 310 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) |
311 | fatal("%s: %.100s: %s", __progname, host, | |
312 | gai_strerror(gaierr)); | |
5260325f | 313 | |
95f1eccc | 314 | /* |
315 | * Try to connect several times. On some machines, the first time | |
316 | * will sometimes fail. In general socket code appears to behave | |
317 | * quite magically on many machines. | |
ce773142 | 318 | */ |
319 | for (attempt = 0; ;) { | |
5260325f | 320 | if (attempt > 0) |
321 | debug("Trying again..."); | |
322 | ||
48e671d5 | 323 | /* Loop through addresses for this host, and try each one in |
6ae2364d | 324 | sequence until the connection succeeds. */ |
48e671d5 | 325 | for (ai = aitop; ai; ai = ai->ai_next) { |
326 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
327 | continue; | |
328 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, | |
329 | ntop, sizeof(ntop), strport, sizeof(strport), | |
330 | NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
331 | error("ssh_connect: getnameinfo failed"); | |
332 | continue; | |
333 | } | |
334 | debug("Connecting to %.200s [%.100s] port %s.", | |
335 | host, ntop, strport); | |
336 | ||
337 | /* Create a socket for connecting. */ | |
3e131a6d | 338 | sock = ssh_create_socket(needpriv, ai); |
48e671d5 | 339 | if (sock < 0) |
ce773142 | 340 | /* Any error is already output */ |
48e671d5 | 341 | continue; |
342 | ||
09ab3296 | 343 | if (timeout_connect(sock, ai->ai_addr, ai->ai_addrlen, |
344 | options.connection_timeout) >= 0) { | |
48e671d5 | 345 | /* Successful connection. */ |
cd332296 | 346 | memcpy(hostaddr, ai->ai_addr, ai->ai_addrlen); |
5260325f | 347 | break; |
48e671d5 | 348 | } else { |
c750d869 | 349 | debug("connect to address %s port %s: %s", |
350 | ntop, strport, strerror(errno)); | |
aa3378df | 351 | /* |
352 | * Close the failed socket; there appear to | |
353 | * be some problems when reusing a socket for | |
354 | * which connect() has already returned an | |
355 | * error. | |
356 | */ | |
5260325f | 357 | close(sock); |
358 | } | |
8efc0c15 | 359 | } |
48e671d5 | 360 | if (ai) |
361 | break; /* Successful connection. */ | |
8efc0c15 | 362 | |
ce773142 | 363 | attempt++; |
364 | if (attempt >= connection_attempts) | |
365 | break; | |
5260325f | 366 | /* Sleep a moment before retrying. */ |
367 | sleep(1); | |
368 | } | |
48e671d5 | 369 | |
370 | freeaddrinfo(aitop); | |
371 | ||
5260325f | 372 | /* Return failure if we didn't get a successful connection. */ |
9bd68577 | 373 | if (attempt >= connection_attempts) { |
cf039bd1 | 374 | error("ssh: connect to host %s port %s: %s", |
9bd68577 | 375 | host, strport, strerror(errno)); |
cf039bd1 | 376 | return (-1); |
9bd68577 | 377 | } |
8efc0c15 | 378 | |
5260325f | 379 | debug("Connection established."); |
8efc0c15 | 380 | |
fd573618 | 381 | /* Set SO_KEEPALIVE if requested. */ |
382 | if (options.tcp_keep_alive && | |
b5c334cc | 383 | setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, |
384 | sizeof(on)) < 0) | |
385 | error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno)); | |
8efc0c15 | 386 | |
5260325f | 387 | /* Set the connection. */ |
388 | packet_set_connection(sock, sock); | |
8efc0c15 | 389 | |
ce773142 | 390 | return 0; |
8efc0c15 | 391 | } |
392 | ||
5260325f | 393 | /* |
394 | * Waits for the server identification string, and sends our own | |
395 | * identification string. | |
396 | */ | |
396c147e | 397 | static void |
5ca51e19 | 398 | ssh_exchange_identification(void) |
8efc0c15 | 399 | { |
5260325f | 400 | char buf[256], remote_version[256]; /* must be same size! */ |
2ceb8101 | 401 | int remote_major, remote_minor, mismatch; |
5260325f | 402 | int connection_in = packet_get_connection_in(); |
403 | int connection_out = packet_get_connection_out(); | |
2b87da3b | 404 | int minor1 = PROTOCOL_MINOR_1; |
2ceb8101 | 405 | u_int i; |
5260325f | 406 | |
05624c18 | 407 | /* Read other side's version identification. */ |
38c295d6 | 408 | for (;;) { |
409 | for (i = 0; i < sizeof(buf) - 1; i++) { | |
05624c18 | 410 | size_t len = atomicio(read, connection_in, &buf[i], 1); |
411 | ||
56964485 | 412 | if (len != 1 && errno == EPIPE) |
38c295d6 | 413 | fatal("ssh_exchange_identification: Connection closed by remote host"); |
05624c18 | 414 | else if (len != 1) |
415 | fatal("ssh_exchange_identification: read: %.100s", strerror(errno)); | |
38c295d6 | 416 | if (buf[i] == '\r') { |
417 | buf[i] = '\n'; | |
418 | buf[i + 1] = 0; | |
419 | continue; /**XXX wait for \n */ | |
420 | } | |
421 | if (buf[i] == '\n') { | |
422 | buf[i + 1] = 0; | |
423 | break; | |
424 | } | |
5260325f | 425 | } |
38c295d6 | 426 | buf[sizeof(buf) - 1] = 0; |
427 | if (strncmp(buf, "SSH-", 4) == 0) | |
5260325f | 428 | break; |
38c295d6 | 429 | debug("ssh_exchange_identification: %s", buf); |
8efc0c15 | 430 | } |
8ce64345 | 431 | server_version_string = xstrdup(buf); |
5260325f | 432 | |
aa3378df | 433 | /* |
434 | * Check that the versions match. In future this might accept | |
435 | * several versions and set appropriate flags to handle them. | |
436 | */ | |
8ce64345 | 437 | if (sscanf(server_version_string, "SSH-%d.%d-%[^\n]\n", |
438 | &remote_major, &remote_minor, remote_version) != 3) | |
5260325f | 439 | fatal("Bad remote protocol version identification: '%.100s'", buf); |
440 | debug("Remote protocol version %d.%d, remote software version %.100s", | |
184eed6a | 441 | remote_major, remote_minor, remote_version); |
5260325f | 442 | |
8ce64345 | 443 | compat_datafellows(remote_version); |
a8be9f80 | 444 | mismatch = 0; |
445 | ||
6aacefa7 | 446 | switch (remote_major) { |
a8be9f80 | 447 | case 1: |
448 | if (remote_minor == 99 && | |
449 | (options.protocol & SSH_PROTO_2) && | |
450 | !(options.protocol & SSH_PROTO_1_PREFERRED)) { | |
451 | enable_compat20(); | |
452 | break; | |
5260325f | 453 | } |
a8be9f80 | 454 | if (!(options.protocol & SSH_PROTO_1)) { |
455 | mismatch = 1; | |
456 | break; | |
457 | } | |
458 | if (remote_minor < 3) { | |
459 | fatal("Remote machine has too old SSH software version."); | |
fa08c86b | 460 | } else if (remote_minor == 3 || remote_minor == 4) { |
a8be9f80 | 461 | /* We speak 1.3, too. */ |
462 | enable_compat13(); | |
fa08c86b | 463 | minor1 = 3; |
a8be9f80 | 464 | if (options.forward_agent) { |
bbe88b6d | 465 | logit("Agent forwarding disabled for protocol 1.3"); |
a8be9f80 | 466 | options.forward_agent = 0; |
467 | } | |
468 | } | |
469 | break; | |
470 | case 2: | |
471 | if (options.protocol & SSH_PROTO_2) { | |
472 | enable_compat20(); | |
473 | break; | |
474 | } | |
475 | /* FALLTHROUGH */ | |
6ae2364d | 476 | default: |
a8be9f80 | 477 | mismatch = 1; |
478 | break; | |
8efc0c15 | 479 | } |
a8be9f80 | 480 | if (mismatch) |
5260325f | 481 | fatal("Protocol major versions differ: %d vs. %d", |
a8be9f80 | 482 | (options.protocol & SSH_PROTO_2) ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1, |
483 | remote_major); | |
5260325f | 484 | /* Send our own protocol version identification. */ |
485 | snprintf(buf, sizeof buf, "SSH-%d.%d-%.100s\n", | |
a8be9f80 | 486 | compat20 ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1, |
fa08c86b | 487 | compat20 ? PROTOCOL_MINOR_2 : minor1, |
8ce64345 | 488 | SSH_VERSION); |
dc54438a | 489 | if (atomicio(vwrite, connection_out, buf, strlen(buf)) != strlen(buf)) |
5260325f | 490 | fatal("write: %.100s", strerror(errno)); |
8ce64345 | 491 | client_version_string = xstrdup(buf); |
492 | chop(client_version_string); | |
493 | chop(server_version_string); | |
494 | debug("Local version string %.100s", client_version_string); | |
8efc0c15 | 495 | } |
496 | ||
f21032a6 | 497 | /* defaults to 'no' */ |
396c147e | 498 | static int |
a2c92c4a | 499 | confirm(const char *prompt) |
8efc0c15 | 500 | { |
616a6b93 | 501 | const char *msg, *again = "Please type 'yes' or 'no': "; |
502 | char *p; | |
503 | int ret = -1; | |
5260325f | 504 | |
f21032a6 | 505 | if (options.batch_mode) |
506 | return 0; | |
616a6b93 | 507 | for (msg = prompt;;msg = again) { |
508 | p = read_passphrase(msg, RP_ECHO); | |
509 | if (p == NULL || | |
510 | (p[0] == '\0') || (p[0] == '\n') || | |
511 | strncasecmp(p, "no", 2) == 0) | |
512 | ret = 0; | |
f11fe301 | 513 | if (p && strncasecmp(p, "yes", 3) == 0) |
616a6b93 | 514 | ret = 1; |
515 | if (p) | |
516 | xfree(p); | |
517 | if (ret != -1) | |
518 | return ret; | |
8efc0c15 | 519 | } |
8efc0c15 | 520 | } |
521 | ||
5260325f | 522 | /* |
f49bc4f7 | 523 | * check whether the supplied host key is valid, return -1 if the key |
524 | * is not valid. the user_hostfile will not be updated if 'readonly' is true. | |
5260325f | 525 | */ |
396c147e | 526 | static int |
a306f2dd | 527 | check_host_key(char *host, struct sockaddr *hostaddr, Key *host_key, |
f49bc4f7 | 528 | int readonly, const char *user_hostfile, const char *system_hostfile) |
8efc0c15 | 529 | { |
4fe2af09 | 530 | Key *file_key; |
b6c7b7b7 | 531 | const char *type = key_type(host_key); |
95f1eccc | 532 | char *ip = NULL; |
22138a36 | 533 | char hostline[1000], *hostp, *fp; |
5260325f | 534 | HostStatus host_status; |
535 | HostStatus ip_status; | |
e79276c2 | 536 | int r, local = 0, host_ip_differ = 0; |
20af321f | 537 | int salen; |
48e671d5 | 538 | char ntop[NI_MAXHOST]; |
616a6b93 | 539 | char msg[1024]; |
1432b5c4 | 540 | int len, host_line, ip_line; |
1e3b8b07 | 541 | const char *host_file = NULL, *ip_file = NULL; |
48e671d5 | 542 | |
543 | /* | |
544 | * Force accepting of the host key for loopback/localhost. The | |
545 | * problem is that if the home directory is NFS-mounted to multiple | |
546 | * machines, localhost will refer to a different machine in each of | |
547 | * them, and the user will get bogus HOST_CHANGED warnings. This | |
548 | * essentially disables host authentication for localhost; however, | |
549 | * this is probably not a real problem. | |
550 | */ | |
a306f2dd | 551 | /** hostaddr == 0! */ |
48e671d5 | 552 | switch (hostaddr->sa_family) { |
553 | case AF_INET: | |
f49bc4f7 | 554 | local = (ntohl(((struct sockaddr_in *)hostaddr)-> |
4e2e5cfd | 555 | sin_addr.s_addr) >> 24) == IN_LOOPBACKNET; |
20af321f | 556 | salen = sizeof(struct sockaddr_in); |
48e671d5 | 557 | break; |
558 | case AF_INET6: | |
f49bc4f7 | 559 | local = IN6_IS_ADDR_LOOPBACK( |
560 | &(((struct sockaddr_in6 *)hostaddr)->sin6_addr)); | |
20af321f | 561 | salen = sizeof(struct sockaddr_in6); |
48e671d5 | 562 | break; |
563 | default: | |
564 | local = 0; | |
20af321f | 565 | salen = sizeof(struct sockaddr_storage); |
48e671d5 | 566 | break; |
567 | } | |
8bbc048a | 568 | if (options.no_host_authentication_for_localhost == 1 && local && |
569 | options.host_key_alias == NULL) { | |
7c49df64 | 570 | debug("Forcing accepting of host key for " |
571 | "loopback/localhost."); | |
f49bc4f7 | 572 | return 0; |
48e671d5 | 573 | } |
5260325f | 574 | |
57112b5a | 575 | /* |
7c49df64 | 576 | * We don't have the remote ip-address for connections |
577 | * using a proxy command | |
578 | */ | |
579 | if (options.proxy_command == NULL) { | |
580 | if (getnameinfo(hostaddr, salen, ntop, sizeof(ntop), | |
581 | NULL, 0, NI_NUMERICHOST) != 0) | |
582 | fatal("check_host_key: getnameinfo failed"); | |
583 | ip = xstrdup(ntop); | |
584 | } else { | |
585 | ip = xstrdup("<no hostip for proxy command>"); | |
586 | } | |
587 | /* | |
588 | * Turn off check_host_ip if the connection is to localhost, via proxy | |
589 | * command or if we don't have a hostname to compare with | |
57112b5a | 590 | */ |
7c49df64 | 591 | if (options.check_host_ip && |
592 | (local || strcmp(host, ip) == 0 || options.proxy_command != NULL)) | |
57112b5a | 593 | options.check_host_ip = 0; |
594 | ||
8abcdba4 | 595 | /* |
7c49df64 | 596 | * Allow the user to record the key under a different name. This is |
8abcdba4 | 597 | * useful for ssh tunneling over forwarded connections or if you run |
7c49df64 | 598 | * multiple sshd's on different ports on the same machine. |
8abcdba4 | 599 | */ |
600 | if (options.host_key_alias != NULL) { | |
601 | host = options.host_key_alias; | |
602 | debug("using hostkeyalias: %s", host); | |
603 | } | |
604 | ||
95f1eccc | 605 | /* |
606 | * Store the host key from the known host file in here so that we can | |
607 | * compare it with the key for the IP address. | |
608 | */ | |
4fe2af09 | 609 | file_key = key_new(host_key->type); |
5260325f | 610 | |
aa3378df | 611 | /* |
7b9b0103 | 612 | * Check if the host key is present in the user's list of known |
aa3378df | 613 | * hosts or in the systemwide list. |
614 | */ | |
1e3b8b07 | 615 | host_file = user_hostfile; |
f49bc4f7 | 616 | host_status = check_host_in_hostfile(host_file, host, host_key, |
184eed6a | 617 | file_key, &host_line); |
1e3b8b07 | 618 | if (host_status == HOST_NEW) { |
619 | host_file = system_hostfile; | |
f49bc4f7 | 620 | host_status = check_host_in_hostfile(host_file, host, host_key, |
621 | file_key, &host_line); | |
1e3b8b07 | 622 | } |
aa3378df | 623 | /* |
624 | * Also perform check for the ip address, skip the check if we are | |
625 | * localhost or the hostname was an ip address to begin with | |
626 | */ | |
7c49df64 | 627 | if (options.check_host_ip) { |
4fe2af09 | 628 | Key *ip_key = key_new(host_key->type); |
5260325f | 629 | |
1e3b8b07 | 630 | ip_file = user_hostfile; |
f49bc4f7 | 631 | ip_status = check_host_in_hostfile(ip_file, ip, host_key, |
632 | ip_key, &ip_line); | |
1e3b8b07 | 633 | if (ip_status == HOST_NEW) { |
634 | ip_file = system_hostfile; | |
f49bc4f7 | 635 | ip_status = check_host_in_hostfile(ip_file, ip, |
636 | host_key, ip_key, &ip_line); | |
1e3b8b07 | 637 | } |
5260325f | 638 | if (host_status == HOST_CHANGED && |
4fe2af09 | 639 | (ip_status != HOST_CHANGED || !key_equal(ip_key, file_key))) |
5260325f | 640 | host_ip_differ = 1; |
641 | ||
4fe2af09 | 642 | key_free(ip_key); |
5260325f | 643 | } else |
644 | ip_status = host_status; | |
645 | ||
4fe2af09 | 646 | key_free(file_key); |
5260325f | 647 | |
648 | switch (host_status) { | |
649 | case HOST_OK: | |
650 | /* The host is known and the key matches. */ | |
1d1ffb87 | 651 | debug("Host '%.200s' is known and matches the %s host key.", |
652 | host, type); | |
1e3b8b07 | 653 | debug("Found key in %s:%d", host_file, host_line); |
7c49df64 | 654 | if (options.check_host_ip && ip_status == HOST_NEW) { |
f49bc4f7 | 655 | if (readonly) |
bbe88b6d | 656 | logit("%s host key for IP address " |
f49bc4f7 | 657 | "'%.128s' not in list of known hosts.", |
7c49df64 | 658 | type, ip); |
f49bc4f7 | 659 | else if (!add_host_to_hostfile(user_hostfile, ip, |
5c63c2ab | 660 | host_key, options.hash_known_hosts)) |
bbe88b6d | 661 | logit("Failed to add the %s host key for IP " |
f49bc4f7 | 662 | "address '%.128s' to the list of known " |
663 | "hosts (%.30s).", type, ip, user_hostfile); | |
664 | else | |
bbe88b6d | 665 | logit("Warning: Permanently added the %s host " |
f49bc4f7 | 666 | "key for IP address '%.128s' to the list " |
667 | "of known hosts.", type, ip); | |
5260325f | 668 | } |
669 | break; | |
670 | case HOST_NEW: | |
f49bc4f7 | 671 | if (readonly) |
672 | goto fail; | |
5260325f | 673 | /* The host is new. */ |
674 | if (options.strict_host_key_checking == 1) { | |
f49bc4f7 | 675 | /* |
676 | * User has requested strict host key checking. We | |
677 | * will not add the host key automatically. The only | |
678 | * alternative left is to abort. | |
679 | */ | |
680 | error("No %s host key is known for %.200s and you " | |
681 | "have requested strict checking.", type, host); | |
682 | goto fail; | |
5260325f | 683 | } else if (options.strict_host_key_checking == 2) { |
1432b5c4 | 684 | char msg1[1024], msg2[1024]; |
685 | ||
686 | if (show_other_keys(host, host_key)) | |
687 | snprintf(msg1, sizeof(msg1), | |
4e2e5cfd | 688 | "\nbut keys of different type are already" |
689 | " known for this host."); | |
1432b5c4 | 690 | else |
691 | snprintf(msg1, sizeof(msg1), "."); | |
5260325f | 692 | /* The default */ |
22138a36 | 693 | fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX); |
1432b5c4 | 694 | msg2[0] = '\0'; |
1432b5c4 | 695 | if (options.verify_host_key_dns) { |
0161a13d | 696 | if (matching_host_key_dns) |
1432b5c4 | 697 | snprintf(msg2, sizeof(msg2), |
698 | "Matching host key fingerprint" | |
699 | " found in DNS.\n"); | |
700 | else | |
701 | snprintf(msg2, sizeof(msg2), | |
702 | "No matching host key fingerprint" | |
703 | " found in DNS.\n"); | |
704 | } | |
616a6b93 | 705 | snprintf(msg, sizeof(msg), |
f49bc4f7 | 706 | "The authenticity of host '%.200s (%s)' can't be " |
8a48a7ef | 707 | "established%s\n" |
1432b5c4 | 708 | "%s key fingerprint is %s.\n%s" |
f49bc4f7 | 709 | "Are you sure you want to continue connecting " |
8a48a7ef | 710 | "(yes/no)? ", |
1432b5c4 | 711 | host, ip, msg1, type, fp, msg2); |
22138a36 | 712 | xfree(fp); |
616a6b93 | 713 | if (!confirm(msg)) |
f49bc4f7 | 714 | goto fail; |
5260325f | 715 | } |
f49bc4f7 | 716 | /* |
717 | * If not in strict mode, add the key automatically to the | |
718 | * local known_hosts file. | |
719 | */ | |
e79276c2 | 720 | if (options.check_host_ip && ip_status == HOST_NEW) { |
721 | snprintf(hostline, sizeof(hostline), "%s,%s", | |
722 | host, ip); | |
723 | hostp = hostline; | |
724 | if (options.hash_known_hosts) { | |
725 | /* Add hash of host and IP separately */ | |
726 | r = add_host_to_hostfile(user_hostfile, host, | |
727 | host_key, options.hash_known_hosts) && | |
728 | add_host_to_hostfile(user_hostfile, ip, | |
729 | host_key, options.hash_known_hosts); | |
730 | } else { | |
731 | /* Add unhashed "host,ip" */ | |
732 | r = add_host_to_hostfile(user_hostfile, | |
733 | hostline, host_key, | |
734 | options.hash_known_hosts); | |
735 | } | |
736 | } else { | |
737 | r = add_host_to_hostfile(user_hostfile, host, host_key, | |
738 | options.hash_known_hosts); | |
739 | hostp = host; | |
740 | } | |
741 | ||
742 | if (!r) | |
bbe88b6d | 743 | logit("Failed to add the host to the list of known " |
f49bc4f7 | 744 | "hosts (%.500s).", user_hostfile); |
5260325f | 745 | else |
bbe88b6d | 746 | logit("Warning: Permanently added '%.200s' (%s) to the " |
f49bc4f7 | 747 | "list of known hosts.", hostp, type); |
5260325f | 748 | break; |
749 | case HOST_CHANGED: | |
750 | if (options.check_host_ip && host_ip_differ) { | |
ca75d7de | 751 | char *key_msg; |
5260325f | 752 | if (ip_status == HOST_NEW) |
ca75d7de | 753 | key_msg = "is unknown"; |
5260325f | 754 | else if (ip_status == HOST_OK) |
ca75d7de | 755 | key_msg = "is unchanged"; |
5260325f | 756 | else |
ca75d7de | 757 | key_msg = "has a different value"; |
5260325f | 758 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
759 | error("@ WARNING: POSSIBLE DNS SPOOFING DETECTED! @"); | |
760 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
1d1ffb87 | 761 | error("The %s host key for %s has changed,", type, host); |
5260325f | 762 | error("and the key for the according IP address %s", ip); |
ca75d7de | 763 | error("%s. This could either mean that", key_msg); |
5260325f | 764 | error("DNS SPOOFING is happening or the IP address for the host"); |
1e3b8b07 | 765 | error("and its host key have changed at the same time."); |
7c49df64 | 766 | if (ip_status != HOST_NEW) |
1e3b8b07 | 767 | error("Offending key for IP in %s:%d", ip_file, ip_line); |
5260325f | 768 | } |
769 | /* The host key has changed. */ | |
1a1bc5d5 | 770 | warn_changed_key(host_key); |
5260325f | 771 | error("Add correct host key in %.100s to get rid of this message.", |
8abcdba4 | 772 | user_hostfile); |
1e3b8b07 | 773 | error("Offending key in %s:%d", host_file, host_line); |
5260325f | 774 | |
aa3378df | 775 | /* |
776 | * If strict host key checking is in use, the user will have | |
777 | * to edit the key manually and we can only abort. | |
778 | */ | |
f49bc4f7 | 779 | if (options.strict_host_key_checking) { |
780 | error("%s host key for %.200s has changed and you have " | |
781 | "requested strict checking.", type, host); | |
782 | goto fail; | |
783 | } | |
5260325f | 784 | |
aa3378df | 785 | /* |
786 | * If strict host key checking has not been requested, allow | |
d453a600 | 787 | * the connection but without MITM-able authentication or |
aa3378df | 788 | * agent forwarding. |
789 | */ | |
5260325f | 790 | if (options.password_authentication) { |
f49bc4f7 | 791 | error("Password authentication is disabled to avoid " |
792 | "man-in-the-middle attacks."); | |
5260325f | 793 | options.password_authentication = 0; |
794 | } | |
d453a600 | 795 | if (options.kbd_interactive_authentication) { |
796 | error("Keyboard-interactive authentication is disabled" | |
797 | " to avoid man-in-the-middle attacks."); | |
798 | options.kbd_interactive_authentication = 0; | |
799 | options.challenge_response_authentication = 0; | |
800 | } | |
801 | if (options.challenge_response_authentication) { | |
802 | error("Challenge/response authentication is disabled" | |
803 | " to avoid man-in-the-middle attacks."); | |
804 | options.challenge_response_authentication = 0; | |
805 | } | |
5260325f | 806 | if (options.forward_agent) { |
f49bc4f7 | 807 | error("Agent forwarding is disabled to avoid " |
808 | "man-in-the-middle attacks."); | |
5260325f | 809 | options.forward_agent = 0; |
810 | } | |
0b6fbf03 | 811 | if (options.forward_x11) { |
f49bc4f7 | 812 | error("X11 forwarding is disabled to avoid " |
813 | "man-in-the-middle attacks."); | |
0b6fbf03 | 814 | options.forward_x11 = 0; |
815 | } | |
f49bc4f7 | 816 | if (options.num_local_forwards > 0 || |
817 | options.num_remote_forwards > 0) { | |
818 | error("Port forwarding is disabled to avoid " | |
819 | "man-in-the-middle attacks."); | |
820 | options.num_local_forwards = | |
184eed6a | 821 | options.num_remote_forwards = 0; |
0b6fbf03 | 822 | } |
aa3378df | 823 | /* |
824 | * XXX Should permit the user to change to use the new id. | |
825 | * This could be done by converting the host key to an | |
826 | * identifying sentence, tell that the host identifies itself | |
827 | * by that sentence, and ask the user if he/she whishes to | |
828 | * accept the authentication. | |
829 | */ | |
5260325f | 830 | break; |
8a48a7ef | 831 | case HOST_FOUND: |
832 | fatal("internal error"); | |
833 | break; | |
5260325f | 834 | } |
0b6fbf03 | 835 | |
7c49df64 | 836 | if (options.check_host_ip && host_status != HOST_CHANGED && |
837 | ip_status == HOST_CHANGED) { | |
616a6b93 | 838 | snprintf(msg, sizeof(msg), |
839 | "Warning: the %s host key for '%.200s' " | |
840 | "differs from the key for the IP address '%.128s'" | |
841 | "\nOffending key for IP in %s:%d", | |
842 | type, host, ip, ip_file, ip_line); | |
843 | if (host_status == HOST_OK) { | |
844 | len = strlen(msg); | |
845 | snprintf(msg + len, sizeof(msg) - len, | |
846 | "\nMatching host key in %s:%d", | |
7203d6bb | 847 | host_file, host_line); |
616a6b93 | 848 | } |
7c49df64 | 849 | if (options.strict_host_key_checking == 1) { |
b0545fe6 | 850 | logit("%s", msg); |
f49bc4f7 | 851 | error("Exiting, you have requested strict checking."); |
852 | goto fail; | |
7c49df64 | 853 | } else if (options.strict_host_key_checking == 2) { |
616a6b93 | 854 | strlcat(msg, "\nAre you sure you want " |
855 | "to continue connecting (yes/no)? ", sizeof(msg)); | |
856 | if (!confirm(msg)) | |
f49bc4f7 | 857 | goto fail; |
616a6b93 | 858 | } else { |
b0545fe6 | 859 | logit("%s", msg); |
7c49df64 | 860 | } |
861 | } | |
862 | ||
0b6fbf03 | 863 | xfree(ip); |
f49bc4f7 | 864 | return 0; |
865 | ||
866 | fail: | |
867 | xfree(ip); | |
868 | return -1; | |
869 | } | |
870 | ||
21289cd0 | 871 | /* returns 0 if key verifies or -1 if key does NOT verify */ |
f49bc4f7 | 872 | int |
873 | verify_host_key(char *host, struct sockaddr *hostaddr, Key *host_key) | |
874 | { | |
875 | struct stat st; | |
0161a13d | 876 | int flags = 0; |
f49bc4f7 | 877 | |
0161a13d | 878 | if (options.verify_host_key_dns && |
879 | verify_host_key_dns(host, hostaddr, host_key, &flags) == 0) { | |
880 | ||
881 | if (flags & DNS_VERIFY_FOUND) { | |
882 | ||
883 | if (options.verify_host_key_dns == 1 && | |
884 | flags & DNS_VERIFY_MATCH && | |
885 | flags & DNS_VERIFY_SECURE) | |
886 | return 0; | |
887 | ||
888 | if (flags & DNS_VERIFY_MATCH) { | |
889 | matching_host_key_dns = 1; | |
890 | } else { | |
891 | warn_changed_key(host_key); | |
892 | error("Update the SSHFP RR in DNS with the new " | |
893 | "host key to get rid of this message."); | |
894 | } | |
21289cd0 | 895 | } |
896 | } | |
21289cd0 | 897 | |
f49bc4f7 | 898 | /* return ok if the key can be found in an old keyfile */ |
899 | if (stat(options.system_hostfile2, &st) == 0 || | |
900 | stat(options.user_hostfile2, &st) == 0) { | |
901 | if (check_host_key(host, hostaddr, host_key, /*readonly*/ 1, | |
902 | options.user_hostfile2, options.system_hostfile2) == 0) | |
903 | return 0; | |
904 | } | |
905 | return check_host_key(host, hostaddr, host_key, /*readonly*/ 0, | |
906 | options.user_hostfile, options.system_hostfile); | |
95f1eccc | 907 | } |
908 | ||
8ce64345 | 909 | /* |
a306f2dd | 910 | * Starts a dialog with the server, and authenticates the current user on the |
911 | * server. This does not need any extra privileges. The basic connection | |
912 | * to the server must already have been established before this is called. | |
913 | * If login fails, this function prints an error and never returns. | |
914 | * This function does not require super-user privileges. | |
8ce64345 | 915 | */ |
916 | void | |
39c00dc2 | 917 | ssh_login(Sensitive *sensitive, const char *orighost, |
63bd8c36 | 918 | struct sockaddr *hostaddr, struct passwd *pw) |
8ce64345 | 919 | { |
a306f2dd | 920 | char *host, *cp; |
8ce64345 | 921 | char *server_user, *local_user; |
8ce64345 | 922 | |
8ce64345 | 923 | local_user = xstrdup(pw->pw_name); |
924 | server_user = options.user ? options.user : local_user; | |
925 | ||
7b2ea3a1 | 926 | /* Convert the user-supplied hostname into all lowercase. */ |
927 | host = xstrdup(orighost); | |
928 | for (cp = host; *cp; cp++) | |
929 | if (isupper(*cp)) | |
9555d258 | 930 | *cp = (char)tolower(*cp); |
7b2ea3a1 | 931 | |
932 | /* Exchange protocol version identification strings with the server. */ | |
933 | ssh_exchange_identification(); | |
934 | ||
935 | /* Put the connection into non-blocking mode. */ | |
936 | packet_set_nonblocking(); | |
937 | ||
7b2ea3a1 | 938 | /* key exchange */ |
7b2ea3a1 | 939 | /* authenticate user */ |
8ce64345 | 940 | if (compat20) { |
941 | ssh_kex2(host, hostaddr); | |
39c00dc2 | 942 | ssh_userauth2(local_user, server_user, host, sensitive); |
8ce64345 | 943 | } else { |
8ce64345 | 944 | ssh_kex(host, hostaddr); |
39c00dc2 | 945 | ssh_userauth1(local_user, server_user, host, sensitive); |
8ce64345 | 946 | } |
7b2ea3a1 | 947 | } |
0ae4fe1d | 948 | |
949 | void | |
950 | ssh_put_password(char *password) | |
951 | { | |
952 | int size; | |
953 | char *padded; | |
954 | ||
99c415db | 955 | if (datafellows & SSH_BUG_PASSWORDPAD) { |
449c5ba5 | 956 | packet_put_cstring(password); |
99c415db | 957 | return; |
958 | } | |
0ae4fe1d | 959 | size = roundup(strlen(password) + 1, 32); |
960 | padded = xmalloc(size); | |
961 | memset(padded, 0, size); | |
962 | strlcpy(padded, password, size); | |
963 | packet_put_string(padded, size); | |
964 | memset(padded, 0, size); | |
965 | xfree(padded); | |
966 | } | |
8a48a7ef | 967 | |
968 | static int | |
969 | show_key_from_file(const char *file, const char *host, int keytype) | |
970 | { | |
971 | Key *found; | |
972 | char *fp; | |
973 | int line, ret; | |
974 | ||
975 | found = key_new(keytype); | |
976 | if ((ret = lookup_key_in_hostfile_by_type(file, host, | |
977 | keytype, found, &line))) { | |
978 | fp = key_fingerprint(found, SSH_FP_MD5, SSH_FP_HEX); | |
bbe88b6d | 979 | logit("WARNING: %s key found for host %s\n" |
567a05bf | 980 | "in %s:%d\n" |
8a48a7ef | 981 | "%s key fingerprint %s.", |
982 | key_type(found), host, file, line, | |
983 | key_type(found), fp); | |
984 | xfree(fp); | |
985 | } | |
986 | key_free(found); | |
987 | return (ret); | |
988 | } | |
989 | ||
990 | /* print all known host keys for a given host, but skip keys of given type */ | |
991 | static int | |
992 | show_other_keys(const char *host, Key *key) | |
993 | { | |
994 | int type[] = { KEY_RSA1, KEY_RSA, KEY_DSA, -1}; | |
995 | int i, found = 0; | |
996 | ||
997 | for (i = 0; type[i] != -1; i++) { | |
998 | if (type[i] == key->type) | |
999 | continue; | |
1000 | if (type[i] != KEY_RSA1 && | |
1001 | show_key_from_file(options.user_hostfile2, host, type[i])) { | |
1002 | found = 1; | |
1003 | continue; | |
1004 | } | |
1005 | if (type[i] != KEY_RSA1 && | |
1006 | show_key_from_file(options.system_hostfile2, host, type[i])) { | |
1007 | found = 1; | |
1008 | continue; | |
1009 | } | |
1010 | if (show_key_from_file(options.user_hostfile, host, type[i])) { | |
1011 | found = 1; | |
1012 | continue; | |
1013 | } | |
1014 | if (show_key_from_file(options.system_hostfile, host, type[i])) { | |
1015 | found = 1; | |
1016 | continue; | |
1017 | } | |
1018 | debug2("no key of type %d for host %s", type[i], host); | |
1019 | } | |
1020 | return (found); | |
1021 | } | |
1a1bc5d5 | 1022 | |
1023 | static void | |
1024 | warn_changed_key(Key *host_key) | |
1025 | { | |
1026 | char *fp; | |
f5da7f70 | 1027 | const char *type = key_type(host_key); |
1a1bc5d5 | 1028 | |
1029 | fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX); | |
1030 | ||
1031 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
1032 | error("@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @"); | |
1033 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
1034 | error("IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!"); | |
1035 | error("Someone could be eavesdropping on you right now (man-in-the-middle attack)!"); | |
1036 | error("It is also possible that the %s host key has just been changed.", type); | |
1037 | error("The fingerprint for the %s key sent by the remote host is\n%s.", | |
1038 | type, fp); | |
1039 | error("Please contact your system administrator."); | |
1040 | ||
1041 | xfree(fp); | |
1a1bc5d5 | 1042 | } |
d20f3c9e | 1043 | |
1044 | /* | |
1045 | * Execute a local command | |
1046 | */ | |
1047 | int | |
1048 | ssh_local_cmd(const char *args) | |
1049 | { | |
1050 | char *shell; | |
1051 | pid_t pid; | |
1052 | int status; | |
1053 | ||
1054 | if (!options.permit_local_command || | |
1055 | args == NULL || !*args) | |
1056 | return (1); | |
1057 | ||
1058 | if ((shell = getenv("SHELL")) == NULL) | |
1059 | shell = _PATH_BSHELL; | |
1060 | ||
1061 | pid = fork(); | |
1062 | if (pid == 0) { | |
1063 | debug3("Executing %s -c \"%s\"", shell, args); | |
1064 | execl(shell, shell, "-c", args, (char *)NULL); | |
1065 | error("Couldn't execute %s -c \"%s\": %s", | |
1066 | shell, args, strerror(errno)); | |
1067 | _exit(1); | |
1068 | } else if (pid == -1) | |
1069 | fatal("fork failed: %.100s", strerror(errno)); | |
1070 | while (waitpid(pid, &status, 0) == -1) | |
1071 | if (errno != EINTR) | |
1072 | fatal("Couldn't wait for child: %s", strerror(errno)); | |
1073 | ||
1074 | if (!WIFEXITED(status)) | |
1075 | return (1); | |
1076 | ||
1077 | return (WEXITSTATUS(status)); | |
1078 | } |