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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" | |
7b9b0103 | 16 | RCSID("$OpenBSD: sshconnect.c,v 1.170 2005/10/30 08:52:18 djm Exp $"); |
8efc0c15 | 17 | |
8ce64345 | 18 | #include <openssl/bn.h> |
a306f2dd | 19 | |
42f11eb2 | 20 | #include "ssh.h" |
8efc0c15 | 21 | #include "xmalloc.h" |
22 | #include "rsa.h" | |
8ce64345 | 23 | #include "buffer.h" |
8efc0c15 | 24 | #include "packet.h" |
8efc0c15 | 25 | #include "uidswap.h" |
26 | #include "compat.h" | |
4fe2af09 | 27 | #include "key.h" |
a306f2dd | 28 | #include "sshconnect.h" |
4fe2af09 | 29 | #include "hostfile.h" |
42f11eb2 | 30 | #include "log.h" |
31 | #include "readconf.h" | |
32 | #include "atomicio.h" | |
33 | #include "misc.h" | |
21289cd0 | 34 | #include "dns.h" |
21289cd0 | 35 | |
a306f2dd | 36 | char *client_version_string = NULL; |
37 | char *server_version_string = NULL; | |
8ce64345 | 38 | |
ed82a2a9 | 39 | static int matching_host_key_dns = 0; |
1432b5c4 | 40 | |
3fb156df | 41 | /* import */ |
57112b5a | 42 | extern Options options; |
48e671d5 | 43 | extern char *__progname; |
3fb156df | 44 | extern uid_t original_real_uid; |
45 | extern uid_t original_effective_uid; | |
6939bbd4 | 46 | extern pid_t proxy_command_pid; |
57112b5a | 47 | |
a704dd54 | 48 | #ifndef INET6_ADDRSTRLEN /* for non IPv6 machines */ |
49 | #define INET6_ADDRSTRLEN 46 | |
50 | #endif | |
51 | ||
8a48a7ef | 52 | static int show_other_keys(const char *, Key *); |
1a1bc5d5 | 53 | static void warn_changed_key(Key *); |
8a48a7ef | 54 | |
5260325f | 55 | /* |
56 | * Connect to the given ssh server using a proxy command. | |
57 | */ | |
396c147e | 58 | static int |
3fb156df | 59 | ssh_proxy_connect(const char *host, u_short port, const char *proxy_command) |
8efc0c15 | 60 | { |
a980cbd7 | 61 | char *command_string, *tmp; |
5260325f | 62 | int pin[2], pout[2]; |
9da5c3c9 | 63 | pid_t pid; |
48e671d5 | 64 | char strport[NI_MAXSERV]; |
a980cbd7 | 65 | size_t len; |
5260325f | 66 | |
67 | /* Convert the port number into a string. */ | |
48e671d5 | 68 | snprintf(strport, sizeof strport, "%hu", port); |
5260325f | 69 | |
6939bbd4 | 70 | /* |
71 | * Build the final command string in the buffer by making the | |
72 | * appropriate substitutions to the given proxy command. | |
73 | * | |
aff51935 | 74 | * Use "exec" to avoid "sh -c" processes on some platforms |
6939bbd4 | 75 | * (e.g. Solaris) |
76 | */ | |
a980cbd7 | 77 | len = strlen(proxy_command) + 6; |
78 | tmp = xmalloc(len); | |
79 | strlcpy(tmp, "exec ", len); | |
80 | strlcat(tmp, proxy_command, len); | |
81 | command_string = percent_expand(tmp, "h", host, | |
82 | "p", strport, (char *)NULL); | |
83 | xfree(tmp); | |
5260325f | 84 | |
85 | /* Create pipes for communicating with the proxy. */ | |
86 | if (pipe(pin) < 0 || pipe(pout) < 0) | |
87 | fatal("Could not create pipes to communicate with the proxy: %.100s", | |
184eed6a | 88 | strerror(errno)); |
5260325f | 89 | |
90 | debug("Executing proxy command: %.500s", command_string); | |
91 | ||
92 | /* Fork and execute the proxy command. */ | |
93 | if ((pid = fork()) == 0) { | |
94 | char *argv[10]; | |
95 | ||
96 | /* Child. Permanently give up superuser privileges. */ | |
3fb156df | 97 | seteuid(original_real_uid); |
98 | setuid(original_real_uid); | |
5260325f | 99 | |
100 | /* Redirect stdin and stdout. */ | |
101 | close(pin[1]); | |
102 | if (pin[0] != 0) { | |
103 | if (dup2(pin[0], 0) < 0) | |
104 | perror("dup2 stdin"); | |
105 | close(pin[0]); | |
106 | } | |
107 | close(pout[0]); | |
108 | if (dup2(pout[1], 1) < 0) | |
109 | perror("dup2 stdout"); | |
110 | /* Cannot be 1 because pin allocated two descriptors. */ | |
111 | close(pout[1]); | |
112 | ||
113 | /* Stderr is left as it is so that error messages get | |
114 | printed on the user's terminal. */ | |
30228d7c | 115 | argv[0] = _PATH_BSHELL; |
5260325f | 116 | argv[1] = "-c"; |
117 | argv[2] = command_string; | |
118 | argv[3] = NULL; | |
119 | ||
120 | /* Execute the proxy command. Note that we gave up any | |
121 | extra privileges above. */ | |
328654d8 | 122 | execv(argv[0], argv); |
123 | perror(argv[0]); | |
5260325f | 124 | exit(1); |
8efc0c15 | 125 | } |
5260325f | 126 | /* Parent. */ |
127 | if (pid < 0) | |
128 | fatal("fork failed: %.100s", strerror(errno)); | |
6939bbd4 | 129 | else |
130 | proxy_command_pid = pid; /* save pid to clean up later */ | |
5260325f | 131 | |
132 | /* Close child side of the descriptors. */ | |
133 | close(pin[0]); | |
134 | close(pout[1]); | |
135 | ||
136 | /* Free the command name. */ | |
a980cbd7 | 137 | xfree(command_string); |
5260325f | 138 | |
139 | /* Set the connection file descriptors. */ | |
140 | packet_set_connection(pout[0], pin[1]); | |
8efc0c15 | 141 | |
ce773142 | 142 | /* Indicate OK return */ |
143 | return 0; | |
5260325f | 144 | } |
8efc0c15 | 145 | |
5260325f | 146 | /* |
147 | * Creates a (possibly privileged) socket for use as the ssh connection. | |
148 | */ | |
396c147e | 149 | static int |
3e131a6d | 150 | ssh_create_socket(int privileged, struct addrinfo *ai) |
8efc0c15 | 151 | { |
3435f5a6 | 152 | int sock, gaierr; |
153 | struct addrinfo hints, *res; | |
5260325f | 154 | |
aa3378df | 155 | /* |
156 | * If we are running as root and want to connect to a privileged | |
157 | * port, bind our own socket to a privileged port. | |
158 | */ | |
5260325f | 159 | if (privileged) { |
160 | int p = IPPORT_RESERVED - 1; | |
3fb156df | 161 | PRIV_START; |
3e131a6d | 162 | sock = rresvport_af(&p, ai->ai_family); |
3fb156df | 163 | PRIV_END; |
5260325f | 164 | if (sock < 0) |
3e131a6d | 165 | error("rresvport: af=%d %.100s", ai->ai_family, |
166 | strerror(errno)); | |
c8d54615 | 167 | else |
168 | debug("Allocated local port %d.", p); | |
3435f5a6 | 169 | return sock; |
170 | } | |
3e131a6d | 171 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
3435f5a6 | 172 | if (sock < 0) |
173 | error("socket: %.100s", strerror(errno)); | |
3435f5a6 | 174 | |
175 | /* Bind the socket to an alternative local IP address */ | |
176 | if (options.bind_address == NULL) | |
177 | return sock; | |
178 | ||
179 | memset(&hints, 0, sizeof(hints)); | |
3e131a6d | 180 | hints.ai_family = ai->ai_family; |
181 | hints.ai_socktype = ai->ai_socktype; | |
182 | hints.ai_protocol = ai->ai_protocol; | |
3435f5a6 | 183 | hints.ai_flags = AI_PASSIVE; |
184 | gaierr = getaddrinfo(options.bind_address, "0", &hints, &res); | |
185 | if (gaierr) { | |
186 | error("getaddrinfo: %s: %s", options.bind_address, | |
187 | gai_strerror(gaierr)); | |
188 | close(sock); | |
189 | return -1; | |
190 | } | |
191 | if (bind(sock, res->ai_addr, res->ai_addrlen) < 0) { | |
192 | error("bind: %s: %s", options.bind_address, strerror(errno)); | |
193 | close(sock); | |
194 | freeaddrinfo(res); | |
195 | return -1; | |
5260325f | 196 | } |
3435f5a6 | 197 | freeaddrinfo(res); |
5260325f | 198 | return sock; |
8efc0c15 | 199 | } |
200 | ||
09ab3296 | 201 | static int |
202 | timeout_connect(int sockfd, const struct sockaddr *serv_addr, | |
203 | socklen_t addrlen, int timeout) | |
204 | { | |
205 | fd_set *fdset; | |
206 | struct timeval tv; | |
207 | socklen_t optlen; | |
da54f5be | 208 | int fdsetsz, optval, rc, result = -1; |
09ab3296 | 209 | |
210 | if (timeout <= 0) | |
211 | return (connect(sockfd, serv_addr, addrlen)); | |
212 | ||
2daf1db1 | 213 | set_nonblock(sockfd); |
09ab3296 | 214 | rc = connect(sockfd, serv_addr, addrlen); |
2daf1db1 | 215 | if (rc == 0) { |
216 | unset_nonblock(sockfd); | |
09ab3296 | 217 | return (0); |
2daf1db1 | 218 | } |
09ab3296 | 219 | if (errno != EINPROGRESS) |
220 | return (-1); | |
221 | ||
222 | fdsetsz = howmany(sockfd + 1, NFDBITS) * sizeof(fd_mask); | |
223 | fdset = (fd_set *)xmalloc(fdsetsz); | |
224 | ||
7caca6d4 | 225 | memset(fdset, 0, fdsetsz); |
09ab3296 | 226 | FD_SET(sockfd, fdset); |
227 | tv.tv_sec = timeout; | |
228 | tv.tv_usec = 0; | |
229 | ||
f8cc7664 | 230 | for (;;) { |
09ab3296 | 231 | rc = select(sockfd + 1, NULL, fdset, NULL, &tv); |
232 | if (rc != -1 || errno != EINTR) | |
233 | break; | |
234 | } | |
235 | ||
f8cc7664 | 236 | switch (rc) { |
09ab3296 | 237 | case 0: |
238 | /* Timed out */ | |
239 | errno = ETIMEDOUT; | |
da54f5be | 240 | break; |
09ab3296 | 241 | case -1: |
242 | /* Select error */ | |
aff51935 | 243 | debug("select: %s", strerror(errno)); |
da54f5be | 244 | break; |
09ab3296 | 245 | case 1: |
246 | /* Completed or failed */ | |
247 | optval = 0; | |
248 | optlen = sizeof(optval); | |
aff51935 | 249 | if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval, |
ce26c02a | 250 | &optlen) == -1) { |
aff51935 | 251 | debug("getsockopt: %s", strerror(errno)); |
da54f5be | 252 | break; |
ce26c02a | 253 | } |
09ab3296 | 254 | if (optval != 0) { |
255 | errno = optval; | |
da54f5be | 256 | break; |
09ab3296 | 257 | } |
da54f5be | 258 | result = 0; |
2daf1db1 | 259 | unset_nonblock(sockfd); |
09ab3296 | 260 | break; |
261 | default: | |
262 | /* Should not occur */ | |
263 | fatal("Bogus return (%d) from select()", rc); | |
264 | } | |
265 | ||
da54f5be | 266 | xfree(fdset); |
267 | return (result); | |
09ab3296 | 268 | } |
269 | ||
5260325f | 270 | /* |
48e671d5 | 271 | * Opens a TCP/IP connection to the remote server on the given host. |
272 | * The address of the remote host will be returned in hostaddr. | |
3fb156df | 273 | * If port is 0, the default port will be used. If needpriv is true, |
5260325f | 274 | * a privileged port will be allocated to make the connection. |
3fb156df | 275 | * This requires super-user privileges if needpriv is true. |
5260325f | 276 | * Connection_attempts specifies the maximum number of tries (one per |
277 | * second). If proxy_command is non-NULL, it specifies the command (with %h | |
278 | * and %p substituted for host and port, respectively) to use to contact | |
279 | * the daemon. | |
280 | */ | |
281 | int | |
48e671d5 | 282 | ssh_connect(const char *host, struct sockaddr_storage * hostaddr, |
dab89049 | 283 | u_short port, int family, int connection_attempts, |
3fb156df | 284 | int needpriv, const char *proxy_command) |
8efc0c15 | 285 | { |
b5c334cc | 286 | int gaierr; |
287 | int on = 1; | |
48e671d5 | 288 | int sock = -1, attempt; |
48e671d5 | 289 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
b5c334cc | 290 | struct addrinfo hints, *ai, *aitop; |
5260325f | 291 | |
a77673cc | 292 | debug2("ssh_connect: needpriv %d", needpriv); |
5260325f | 293 | |
5260325f | 294 | /* If a proxy command is given, connect using it. */ |
295 | if (proxy_command != NULL) | |
3fb156df | 296 | return ssh_proxy_connect(host, port, proxy_command); |
5260325f | 297 | |
298 | /* No proxy command. */ | |
299 | ||
48e671d5 | 300 | memset(&hints, 0, sizeof(hints)); |
dab89049 | 301 | hints.ai_family = family; |
48e671d5 | 302 | hints.ai_socktype = SOCK_STREAM; |
d6133f43 | 303 | snprintf(strport, sizeof strport, "%u", port); |
48e671d5 | 304 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) |
305 | fatal("%s: %.100s: %s", __progname, host, | |
306 | gai_strerror(gaierr)); | |
5260325f | 307 | |
95f1eccc | 308 | /* |
309 | * Try to connect several times. On some machines, the first time | |
310 | * will sometimes fail. In general socket code appears to behave | |
311 | * quite magically on many machines. | |
ce773142 | 312 | */ |
313 | for (attempt = 0; ;) { | |
5260325f | 314 | if (attempt > 0) |
315 | debug("Trying again..."); | |
316 | ||
48e671d5 | 317 | /* Loop through addresses for this host, and try each one in |
6ae2364d | 318 | sequence until the connection succeeds. */ |
48e671d5 | 319 | for (ai = aitop; ai; ai = ai->ai_next) { |
320 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
321 | continue; | |
322 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, | |
323 | ntop, sizeof(ntop), strport, sizeof(strport), | |
324 | NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
325 | error("ssh_connect: getnameinfo failed"); | |
326 | continue; | |
327 | } | |
328 | debug("Connecting to %.200s [%.100s] port %s.", | |
329 | host, ntop, strport); | |
330 | ||
331 | /* Create a socket for connecting. */ | |
3e131a6d | 332 | sock = ssh_create_socket(needpriv, ai); |
48e671d5 | 333 | if (sock < 0) |
ce773142 | 334 | /* Any error is already output */ |
48e671d5 | 335 | continue; |
336 | ||
09ab3296 | 337 | if (timeout_connect(sock, ai->ai_addr, ai->ai_addrlen, |
338 | options.connection_timeout) >= 0) { | |
48e671d5 | 339 | /* Successful connection. */ |
cd332296 | 340 | memcpy(hostaddr, ai->ai_addr, ai->ai_addrlen); |
5260325f | 341 | break; |
48e671d5 | 342 | } else { |
c750d869 | 343 | debug("connect to address %s port %s: %s", |
344 | ntop, strport, strerror(errno)); | |
aa3378df | 345 | /* |
346 | * Close the failed socket; there appear to | |
347 | * be some problems when reusing a socket for | |
348 | * which connect() has already returned an | |
349 | * error. | |
350 | */ | |
5260325f | 351 | close(sock); |
352 | } | |
8efc0c15 | 353 | } |
48e671d5 | 354 | if (ai) |
355 | break; /* Successful connection. */ | |
8efc0c15 | 356 | |
ce773142 | 357 | attempt++; |
358 | if (attempt >= connection_attempts) | |
359 | break; | |
5260325f | 360 | /* Sleep a moment before retrying. */ |
361 | sleep(1); | |
362 | } | |
48e671d5 | 363 | |
364 | freeaddrinfo(aitop); | |
365 | ||
5260325f | 366 | /* Return failure if we didn't get a successful connection. */ |
9bd68577 | 367 | if (attempt >= connection_attempts) { |
cf039bd1 | 368 | error("ssh: connect to host %s port %s: %s", |
9bd68577 | 369 | host, strport, strerror(errno)); |
cf039bd1 | 370 | return (-1); |
9bd68577 | 371 | } |
8efc0c15 | 372 | |
5260325f | 373 | debug("Connection established."); |
8efc0c15 | 374 | |
fd573618 | 375 | /* Set SO_KEEPALIVE if requested. */ |
376 | if (options.tcp_keep_alive && | |
b5c334cc | 377 | setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, |
378 | sizeof(on)) < 0) | |
379 | error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno)); | |
8efc0c15 | 380 | |
5260325f | 381 | /* Set the connection. */ |
382 | packet_set_connection(sock, sock); | |
8efc0c15 | 383 | |
ce773142 | 384 | return 0; |
8efc0c15 | 385 | } |
386 | ||
5260325f | 387 | /* |
388 | * Waits for the server identification string, and sends our own | |
389 | * identification string. | |
390 | */ | |
396c147e | 391 | static void |
5ca51e19 | 392 | ssh_exchange_identification(void) |
8efc0c15 | 393 | { |
5260325f | 394 | char buf[256], remote_version[256]; /* must be same size! */ |
2ceb8101 | 395 | int remote_major, remote_minor, mismatch; |
5260325f | 396 | int connection_in = packet_get_connection_in(); |
397 | int connection_out = packet_get_connection_out(); | |
2b87da3b | 398 | int minor1 = PROTOCOL_MINOR_1; |
2ceb8101 | 399 | u_int i; |
5260325f | 400 | |
05624c18 | 401 | /* Read other side's version identification. */ |
38c295d6 | 402 | for (;;) { |
403 | for (i = 0; i < sizeof(buf) - 1; i++) { | |
05624c18 | 404 | size_t len = atomicio(read, connection_in, &buf[i], 1); |
405 | ||
56964485 | 406 | if (len != 1 && errno == EPIPE) |
38c295d6 | 407 | fatal("ssh_exchange_identification: Connection closed by remote host"); |
05624c18 | 408 | else if (len != 1) |
409 | fatal("ssh_exchange_identification: read: %.100s", strerror(errno)); | |
38c295d6 | 410 | if (buf[i] == '\r') { |
411 | buf[i] = '\n'; | |
412 | buf[i + 1] = 0; | |
413 | continue; /**XXX wait for \n */ | |
414 | } | |
415 | if (buf[i] == '\n') { | |
416 | buf[i + 1] = 0; | |
417 | break; | |
418 | } | |
5260325f | 419 | } |
38c295d6 | 420 | buf[sizeof(buf) - 1] = 0; |
421 | if (strncmp(buf, "SSH-", 4) == 0) | |
5260325f | 422 | break; |
38c295d6 | 423 | debug("ssh_exchange_identification: %s", buf); |
8efc0c15 | 424 | } |
8ce64345 | 425 | server_version_string = xstrdup(buf); |
5260325f | 426 | |
aa3378df | 427 | /* |
428 | * Check that the versions match. In future this might accept | |
429 | * several versions and set appropriate flags to handle them. | |
430 | */ | |
8ce64345 | 431 | if (sscanf(server_version_string, "SSH-%d.%d-%[^\n]\n", |
432 | &remote_major, &remote_minor, remote_version) != 3) | |
5260325f | 433 | fatal("Bad remote protocol version identification: '%.100s'", buf); |
434 | debug("Remote protocol version %d.%d, remote software version %.100s", | |
184eed6a | 435 | remote_major, remote_minor, remote_version); |
5260325f | 436 | |
8ce64345 | 437 | compat_datafellows(remote_version); |
a8be9f80 | 438 | mismatch = 0; |
439 | ||
6aacefa7 | 440 | switch (remote_major) { |
a8be9f80 | 441 | case 1: |
442 | if (remote_minor == 99 && | |
443 | (options.protocol & SSH_PROTO_2) && | |
444 | !(options.protocol & SSH_PROTO_1_PREFERRED)) { | |
445 | enable_compat20(); | |
446 | break; | |
5260325f | 447 | } |
a8be9f80 | 448 | if (!(options.protocol & SSH_PROTO_1)) { |
449 | mismatch = 1; | |
450 | break; | |
451 | } | |
452 | if (remote_minor < 3) { | |
453 | fatal("Remote machine has too old SSH software version."); | |
fa08c86b | 454 | } else if (remote_minor == 3 || remote_minor == 4) { |
a8be9f80 | 455 | /* We speak 1.3, too. */ |
456 | enable_compat13(); | |
fa08c86b | 457 | minor1 = 3; |
a8be9f80 | 458 | if (options.forward_agent) { |
bbe88b6d | 459 | logit("Agent forwarding disabled for protocol 1.3"); |
a8be9f80 | 460 | options.forward_agent = 0; |
461 | } | |
462 | } | |
463 | break; | |
464 | case 2: | |
465 | if (options.protocol & SSH_PROTO_2) { | |
466 | enable_compat20(); | |
467 | break; | |
468 | } | |
469 | /* FALLTHROUGH */ | |
6ae2364d | 470 | default: |
a8be9f80 | 471 | mismatch = 1; |
472 | break; | |
8efc0c15 | 473 | } |
a8be9f80 | 474 | if (mismatch) |
5260325f | 475 | fatal("Protocol major versions differ: %d vs. %d", |
a8be9f80 | 476 | (options.protocol & SSH_PROTO_2) ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1, |
477 | remote_major); | |
5260325f | 478 | /* Send our own protocol version identification. */ |
479 | snprintf(buf, sizeof buf, "SSH-%d.%d-%.100s\n", | |
a8be9f80 | 480 | compat20 ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1, |
fa08c86b | 481 | compat20 ? PROTOCOL_MINOR_2 : minor1, |
8ce64345 | 482 | SSH_VERSION); |
dc54438a | 483 | if (atomicio(vwrite, connection_out, buf, strlen(buf)) != strlen(buf)) |
5260325f | 484 | fatal("write: %.100s", strerror(errno)); |
8ce64345 | 485 | client_version_string = xstrdup(buf); |
486 | chop(client_version_string); | |
487 | chop(server_version_string); | |
488 | debug("Local version string %.100s", client_version_string); | |
8efc0c15 | 489 | } |
490 | ||
f21032a6 | 491 | /* defaults to 'no' */ |
396c147e | 492 | static int |
a2c92c4a | 493 | confirm(const char *prompt) |
8efc0c15 | 494 | { |
616a6b93 | 495 | const char *msg, *again = "Please type 'yes' or 'no': "; |
496 | char *p; | |
497 | int ret = -1; | |
5260325f | 498 | |
f21032a6 | 499 | if (options.batch_mode) |
500 | return 0; | |
616a6b93 | 501 | for (msg = prompt;;msg = again) { |
502 | p = read_passphrase(msg, RP_ECHO); | |
503 | if (p == NULL || | |
504 | (p[0] == '\0') || (p[0] == '\n') || | |
505 | strncasecmp(p, "no", 2) == 0) | |
506 | ret = 0; | |
f11fe301 | 507 | if (p && strncasecmp(p, "yes", 3) == 0) |
616a6b93 | 508 | ret = 1; |
509 | if (p) | |
510 | xfree(p); | |
511 | if (ret != -1) | |
512 | return ret; | |
8efc0c15 | 513 | } |
8efc0c15 | 514 | } |
515 | ||
5260325f | 516 | /* |
f49bc4f7 | 517 | * check whether the supplied host key is valid, return -1 if the key |
518 | * is not valid. the user_hostfile will not be updated if 'readonly' is true. | |
5260325f | 519 | */ |
396c147e | 520 | static int |
a306f2dd | 521 | check_host_key(char *host, struct sockaddr *hostaddr, Key *host_key, |
f49bc4f7 | 522 | int readonly, const char *user_hostfile, const char *system_hostfile) |
8efc0c15 | 523 | { |
4fe2af09 | 524 | Key *file_key; |
b6c7b7b7 | 525 | const char *type = key_type(host_key); |
95f1eccc | 526 | char *ip = NULL; |
22138a36 | 527 | char hostline[1000], *hostp, *fp; |
5260325f | 528 | HostStatus host_status; |
529 | HostStatus ip_status; | |
e79276c2 | 530 | int r, local = 0, host_ip_differ = 0; |
20af321f | 531 | int salen; |
48e671d5 | 532 | char ntop[NI_MAXHOST]; |
616a6b93 | 533 | char msg[1024]; |
1432b5c4 | 534 | int len, host_line, ip_line; |
1e3b8b07 | 535 | const char *host_file = NULL, *ip_file = NULL; |
48e671d5 | 536 | |
537 | /* | |
538 | * Force accepting of the host key for loopback/localhost. The | |
539 | * problem is that if the home directory is NFS-mounted to multiple | |
540 | * machines, localhost will refer to a different machine in each of | |
541 | * them, and the user will get bogus HOST_CHANGED warnings. This | |
542 | * essentially disables host authentication for localhost; however, | |
543 | * this is probably not a real problem. | |
544 | */ | |
a306f2dd | 545 | /** hostaddr == 0! */ |
48e671d5 | 546 | switch (hostaddr->sa_family) { |
547 | case AF_INET: | |
f49bc4f7 | 548 | local = (ntohl(((struct sockaddr_in *)hostaddr)-> |
4e2e5cfd | 549 | sin_addr.s_addr) >> 24) == IN_LOOPBACKNET; |
20af321f | 550 | salen = sizeof(struct sockaddr_in); |
48e671d5 | 551 | break; |
552 | case AF_INET6: | |
f49bc4f7 | 553 | local = IN6_IS_ADDR_LOOPBACK( |
554 | &(((struct sockaddr_in6 *)hostaddr)->sin6_addr)); | |
20af321f | 555 | salen = sizeof(struct sockaddr_in6); |
48e671d5 | 556 | break; |
557 | default: | |
558 | local = 0; | |
20af321f | 559 | salen = sizeof(struct sockaddr_storage); |
48e671d5 | 560 | break; |
561 | } | |
8bbc048a | 562 | if (options.no_host_authentication_for_localhost == 1 && local && |
563 | options.host_key_alias == NULL) { | |
7c49df64 | 564 | debug("Forcing accepting of host key for " |
565 | "loopback/localhost."); | |
f49bc4f7 | 566 | return 0; |
48e671d5 | 567 | } |
5260325f | 568 | |
57112b5a | 569 | /* |
7c49df64 | 570 | * We don't have the remote ip-address for connections |
571 | * using a proxy command | |
572 | */ | |
573 | if (options.proxy_command == NULL) { | |
574 | if (getnameinfo(hostaddr, salen, ntop, sizeof(ntop), | |
575 | NULL, 0, NI_NUMERICHOST) != 0) | |
576 | fatal("check_host_key: getnameinfo failed"); | |
577 | ip = xstrdup(ntop); | |
578 | } else { | |
579 | ip = xstrdup("<no hostip for proxy command>"); | |
580 | } | |
581 | /* | |
582 | * Turn off check_host_ip if the connection is to localhost, via proxy | |
583 | * command or if we don't have a hostname to compare with | |
57112b5a | 584 | */ |
7c49df64 | 585 | if (options.check_host_ip && |
586 | (local || strcmp(host, ip) == 0 || options.proxy_command != NULL)) | |
57112b5a | 587 | options.check_host_ip = 0; |
588 | ||
8abcdba4 | 589 | /* |
7c49df64 | 590 | * Allow the user to record the key under a different name. This is |
8abcdba4 | 591 | * useful for ssh tunneling over forwarded connections or if you run |
7c49df64 | 592 | * multiple sshd's on different ports on the same machine. |
8abcdba4 | 593 | */ |
594 | if (options.host_key_alias != NULL) { | |
595 | host = options.host_key_alias; | |
596 | debug("using hostkeyalias: %s", host); | |
597 | } | |
598 | ||
95f1eccc | 599 | /* |
600 | * Store the host key from the known host file in here so that we can | |
601 | * compare it with the key for the IP address. | |
602 | */ | |
4fe2af09 | 603 | file_key = key_new(host_key->type); |
5260325f | 604 | |
aa3378df | 605 | /* |
7b9b0103 | 606 | * Check if the host key is present in the user's list of known |
aa3378df | 607 | * hosts or in the systemwide list. |
608 | */ | |
1e3b8b07 | 609 | host_file = user_hostfile; |
f49bc4f7 | 610 | host_status = check_host_in_hostfile(host_file, host, host_key, |
184eed6a | 611 | file_key, &host_line); |
1e3b8b07 | 612 | if (host_status == HOST_NEW) { |
613 | host_file = system_hostfile; | |
f49bc4f7 | 614 | host_status = check_host_in_hostfile(host_file, host, host_key, |
615 | file_key, &host_line); | |
1e3b8b07 | 616 | } |
aa3378df | 617 | /* |
618 | * Also perform check for the ip address, skip the check if we are | |
619 | * localhost or the hostname was an ip address to begin with | |
620 | */ | |
7c49df64 | 621 | if (options.check_host_ip) { |
4fe2af09 | 622 | Key *ip_key = key_new(host_key->type); |
5260325f | 623 | |
1e3b8b07 | 624 | ip_file = user_hostfile; |
f49bc4f7 | 625 | ip_status = check_host_in_hostfile(ip_file, ip, host_key, |
626 | ip_key, &ip_line); | |
1e3b8b07 | 627 | if (ip_status == HOST_NEW) { |
628 | ip_file = system_hostfile; | |
f49bc4f7 | 629 | ip_status = check_host_in_hostfile(ip_file, ip, |
630 | host_key, ip_key, &ip_line); | |
1e3b8b07 | 631 | } |
5260325f | 632 | if (host_status == HOST_CHANGED && |
4fe2af09 | 633 | (ip_status != HOST_CHANGED || !key_equal(ip_key, file_key))) |
5260325f | 634 | host_ip_differ = 1; |
635 | ||
4fe2af09 | 636 | key_free(ip_key); |
5260325f | 637 | } else |
638 | ip_status = host_status; | |
639 | ||
4fe2af09 | 640 | key_free(file_key); |
5260325f | 641 | |
642 | switch (host_status) { | |
643 | case HOST_OK: | |
644 | /* The host is known and the key matches. */ | |
1d1ffb87 | 645 | debug("Host '%.200s' is known and matches the %s host key.", |
646 | host, type); | |
1e3b8b07 | 647 | debug("Found key in %s:%d", host_file, host_line); |
7c49df64 | 648 | if (options.check_host_ip && ip_status == HOST_NEW) { |
f49bc4f7 | 649 | if (readonly) |
bbe88b6d | 650 | logit("%s host key for IP address " |
f49bc4f7 | 651 | "'%.128s' not in list of known hosts.", |
7c49df64 | 652 | type, ip); |
f49bc4f7 | 653 | else if (!add_host_to_hostfile(user_hostfile, ip, |
5c63c2ab | 654 | host_key, options.hash_known_hosts)) |
bbe88b6d | 655 | logit("Failed to add the %s host key for IP " |
f49bc4f7 | 656 | "address '%.128s' to the list of known " |
657 | "hosts (%.30s).", type, ip, user_hostfile); | |
658 | else | |
bbe88b6d | 659 | logit("Warning: Permanently added the %s host " |
f49bc4f7 | 660 | "key for IP address '%.128s' to the list " |
661 | "of known hosts.", type, ip); | |
5260325f | 662 | } |
663 | break; | |
664 | case HOST_NEW: | |
f49bc4f7 | 665 | if (readonly) |
666 | goto fail; | |
5260325f | 667 | /* The host is new. */ |
668 | if (options.strict_host_key_checking == 1) { | |
f49bc4f7 | 669 | /* |
670 | * User has requested strict host key checking. We | |
671 | * will not add the host key automatically. The only | |
672 | * alternative left is to abort. | |
673 | */ | |
674 | error("No %s host key is known for %.200s and you " | |
675 | "have requested strict checking.", type, host); | |
676 | goto fail; | |
5260325f | 677 | } else if (options.strict_host_key_checking == 2) { |
1432b5c4 | 678 | char msg1[1024], msg2[1024]; |
679 | ||
680 | if (show_other_keys(host, host_key)) | |
681 | snprintf(msg1, sizeof(msg1), | |
4e2e5cfd | 682 | "\nbut keys of different type are already" |
683 | " known for this host."); | |
1432b5c4 | 684 | else |
685 | snprintf(msg1, sizeof(msg1), "."); | |
5260325f | 686 | /* The default */ |
22138a36 | 687 | fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX); |
1432b5c4 | 688 | msg2[0] = '\0'; |
1432b5c4 | 689 | if (options.verify_host_key_dns) { |
0161a13d | 690 | if (matching_host_key_dns) |
1432b5c4 | 691 | snprintf(msg2, sizeof(msg2), |
692 | "Matching host key fingerprint" | |
693 | " found in DNS.\n"); | |
694 | else | |
695 | snprintf(msg2, sizeof(msg2), | |
696 | "No matching host key fingerprint" | |
697 | " found in DNS.\n"); | |
698 | } | |
616a6b93 | 699 | snprintf(msg, sizeof(msg), |
f49bc4f7 | 700 | "The authenticity of host '%.200s (%s)' can't be " |
8a48a7ef | 701 | "established%s\n" |
1432b5c4 | 702 | "%s key fingerprint is %s.\n%s" |
f49bc4f7 | 703 | "Are you sure you want to continue connecting " |
8a48a7ef | 704 | "(yes/no)? ", |
1432b5c4 | 705 | host, ip, msg1, type, fp, msg2); |
22138a36 | 706 | xfree(fp); |
616a6b93 | 707 | if (!confirm(msg)) |
f49bc4f7 | 708 | goto fail; |
5260325f | 709 | } |
f49bc4f7 | 710 | /* |
711 | * If not in strict mode, add the key automatically to the | |
712 | * local known_hosts file. | |
713 | */ | |
e79276c2 | 714 | if (options.check_host_ip && ip_status == HOST_NEW) { |
715 | snprintf(hostline, sizeof(hostline), "%s,%s", | |
716 | host, ip); | |
717 | hostp = hostline; | |
718 | if (options.hash_known_hosts) { | |
719 | /* Add hash of host and IP separately */ | |
720 | r = add_host_to_hostfile(user_hostfile, host, | |
721 | host_key, options.hash_known_hosts) && | |
722 | add_host_to_hostfile(user_hostfile, ip, | |
723 | host_key, options.hash_known_hosts); | |
724 | } else { | |
725 | /* Add unhashed "host,ip" */ | |
726 | r = add_host_to_hostfile(user_hostfile, | |
727 | hostline, host_key, | |
728 | options.hash_known_hosts); | |
729 | } | |
730 | } else { | |
731 | r = add_host_to_hostfile(user_hostfile, host, host_key, | |
732 | options.hash_known_hosts); | |
733 | hostp = host; | |
734 | } | |
735 | ||
736 | if (!r) | |
bbe88b6d | 737 | logit("Failed to add the host to the list of known " |
f49bc4f7 | 738 | "hosts (%.500s).", user_hostfile); |
5260325f | 739 | else |
bbe88b6d | 740 | logit("Warning: Permanently added '%.200s' (%s) to the " |
f49bc4f7 | 741 | "list of known hosts.", hostp, type); |
5260325f | 742 | break; |
743 | case HOST_CHANGED: | |
744 | if (options.check_host_ip && host_ip_differ) { | |
ca75d7de | 745 | char *key_msg; |
5260325f | 746 | if (ip_status == HOST_NEW) |
ca75d7de | 747 | key_msg = "is unknown"; |
5260325f | 748 | else if (ip_status == HOST_OK) |
ca75d7de | 749 | key_msg = "is unchanged"; |
5260325f | 750 | else |
ca75d7de | 751 | key_msg = "has a different value"; |
5260325f | 752 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
753 | error("@ WARNING: POSSIBLE DNS SPOOFING DETECTED! @"); | |
754 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
1d1ffb87 | 755 | error("The %s host key for %s has changed,", type, host); |
5260325f | 756 | error("and the key for the according IP address %s", ip); |
ca75d7de | 757 | error("%s. This could either mean that", key_msg); |
5260325f | 758 | error("DNS SPOOFING is happening or the IP address for the host"); |
1e3b8b07 | 759 | error("and its host key have changed at the same time."); |
7c49df64 | 760 | if (ip_status != HOST_NEW) |
1e3b8b07 | 761 | error("Offending key for IP in %s:%d", ip_file, ip_line); |
5260325f | 762 | } |
763 | /* The host key has changed. */ | |
1a1bc5d5 | 764 | warn_changed_key(host_key); |
5260325f | 765 | error("Add correct host key in %.100s to get rid of this message.", |
8abcdba4 | 766 | user_hostfile); |
1e3b8b07 | 767 | error("Offending key in %s:%d", host_file, host_line); |
5260325f | 768 | |
aa3378df | 769 | /* |
770 | * If strict host key checking is in use, the user will have | |
771 | * to edit the key manually and we can only abort. | |
772 | */ | |
f49bc4f7 | 773 | if (options.strict_host_key_checking) { |
774 | error("%s host key for %.200s has changed and you have " | |
775 | "requested strict checking.", type, host); | |
776 | goto fail; | |
777 | } | |
5260325f | 778 | |
aa3378df | 779 | /* |
780 | * If strict host key checking has not been requested, allow | |
d453a600 | 781 | * the connection but without MITM-able authentication or |
aa3378df | 782 | * agent forwarding. |
783 | */ | |
5260325f | 784 | if (options.password_authentication) { |
f49bc4f7 | 785 | error("Password authentication is disabled to avoid " |
786 | "man-in-the-middle attacks."); | |
5260325f | 787 | options.password_authentication = 0; |
788 | } | |
d453a600 | 789 | if (options.kbd_interactive_authentication) { |
790 | error("Keyboard-interactive authentication is disabled" | |
791 | " to avoid man-in-the-middle attacks."); | |
792 | options.kbd_interactive_authentication = 0; | |
793 | options.challenge_response_authentication = 0; | |
794 | } | |
795 | if (options.challenge_response_authentication) { | |
796 | error("Challenge/response authentication is disabled" | |
797 | " to avoid man-in-the-middle attacks."); | |
798 | options.challenge_response_authentication = 0; | |
799 | } | |
5260325f | 800 | if (options.forward_agent) { |
f49bc4f7 | 801 | error("Agent forwarding is disabled to avoid " |
802 | "man-in-the-middle attacks."); | |
5260325f | 803 | options.forward_agent = 0; |
804 | } | |
0b6fbf03 | 805 | if (options.forward_x11) { |
f49bc4f7 | 806 | error("X11 forwarding is disabled to avoid " |
807 | "man-in-the-middle attacks."); | |
0b6fbf03 | 808 | options.forward_x11 = 0; |
809 | } | |
f49bc4f7 | 810 | if (options.num_local_forwards > 0 || |
811 | options.num_remote_forwards > 0) { | |
812 | error("Port forwarding is disabled to avoid " | |
813 | "man-in-the-middle attacks."); | |
814 | options.num_local_forwards = | |
184eed6a | 815 | options.num_remote_forwards = 0; |
0b6fbf03 | 816 | } |
aa3378df | 817 | /* |
818 | * XXX Should permit the user to change to use the new id. | |
819 | * This could be done by converting the host key to an | |
820 | * identifying sentence, tell that the host identifies itself | |
821 | * by that sentence, and ask the user if he/she whishes to | |
822 | * accept the authentication. | |
823 | */ | |
5260325f | 824 | break; |
8a48a7ef | 825 | case HOST_FOUND: |
826 | fatal("internal error"); | |
827 | break; | |
5260325f | 828 | } |
0b6fbf03 | 829 | |
7c49df64 | 830 | if (options.check_host_ip && host_status != HOST_CHANGED && |
831 | ip_status == HOST_CHANGED) { | |
616a6b93 | 832 | snprintf(msg, sizeof(msg), |
833 | "Warning: the %s host key for '%.200s' " | |
834 | "differs from the key for the IP address '%.128s'" | |
835 | "\nOffending key for IP in %s:%d", | |
836 | type, host, ip, ip_file, ip_line); | |
837 | if (host_status == HOST_OK) { | |
838 | len = strlen(msg); | |
839 | snprintf(msg + len, sizeof(msg) - len, | |
840 | "\nMatching host key in %s:%d", | |
7203d6bb | 841 | host_file, host_line); |
616a6b93 | 842 | } |
7c49df64 | 843 | if (options.strict_host_key_checking == 1) { |
b0545fe6 | 844 | logit("%s", msg); |
f49bc4f7 | 845 | error("Exiting, you have requested strict checking."); |
846 | goto fail; | |
7c49df64 | 847 | } else if (options.strict_host_key_checking == 2) { |
616a6b93 | 848 | strlcat(msg, "\nAre you sure you want " |
849 | "to continue connecting (yes/no)? ", sizeof(msg)); | |
850 | if (!confirm(msg)) | |
f49bc4f7 | 851 | goto fail; |
616a6b93 | 852 | } else { |
b0545fe6 | 853 | logit("%s", msg); |
7c49df64 | 854 | } |
855 | } | |
856 | ||
0b6fbf03 | 857 | xfree(ip); |
f49bc4f7 | 858 | return 0; |
859 | ||
860 | fail: | |
861 | xfree(ip); | |
862 | return -1; | |
863 | } | |
864 | ||
21289cd0 | 865 | /* returns 0 if key verifies or -1 if key does NOT verify */ |
f49bc4f7 | 866 | int |
867 | verify_host_key(char *host, struct sockaddr *hostaddr, Key *host_key) | |
868 | { | |
869 | struct stat st; | |
0161a13d | 870 | int flags = 0; |
f49bc4f7 | 871 | |
0161a13d | 872 | if (options.verify_host_key_dns && |
873 | verify_host_key_dns(host, hostaddr, host_key, &flags) == 0) { | |
874 | ||
875 | if (flags & DNS_VERIFY_FOUND) { | |
876 | ||
877 | if (options.verify_host_key_dns == 1 && | |
878 | flags & DNS_VERIFY_MATCH && | |
879 | flags & DNS_VERIFY_SECURE) | |
880 | return 0; | |
881 | ||
882 | if (flags & DNS_VERIFY_MATCH) { | |
883 | matching_host_key_dns = 1; | |
884 | } else { | |
885 | warn_changed_key(host_key); | |
886 | error("Update the SSHFP RR in DNS with the new " | |
887 | "host key to get rid of this message."); | |
888 | } | |
21289cd0 | 889 | } |
890 | } | |
21289cd0 | 891 | |
f49bc4f7 | 892 | /* return ok if the key can be found in an old keyfile */ |
893 | if (stat(options.system_hostfile2, &st) == 0 || | |
894 | stat(options.user_hostfile2, &st) == 0) { | |
895 | if (check_host_key(host, hostaddr, host_key, /*readonly*/ 1, | |
896 | options.user_hostfile2, options.system_hostfile2) == 0) | |
897 | return 0; | |
898 | } | |
899 | return check_host_key(host, hostaddr, host_key, /*readonly*/ 0, | |
900 | options.user_hostfile, options.system_hostfile); | |
95f1eccc | 901 | } |
902 | ||
8ce64345 | 903 | /* |
a306f2dd | 904 | * Starts a dialog with the server, and authenticates the current user on the |
905 | * server. This does not need any extra privileges. The basic connection | |
906 | * to the server must already have been established before this is called. | |
907 | * If login fails, this function prints an error and never returns. | |
908 | * This function does not require super-user privileges. | |
8ce64345 | 909 | */ |
910 | void | |
39c00dc2 | 911 | ssh_login(Sensitive *sensitive, const char *orighost, |
63bd8c36 | 912 | struct sockaddr *hostaddr, struct passwd *pw) |
8ce64345 | 913 | { |
a306f2dd | 914 | char *host, *cp; |
8ce64345 | 915 | char *server_user, *local_user; |
8ce64345 | 916 | |
8ce64345 | 917 | local_user = xstrdup(pw->pw_name); |
918 | server_user = options.user ? options.user : local_user; | |
919 | ||
7b2ea3a1 | 920 | /* Convert the user-supplied hostname into all lowercase. */ |
921 | host = xstrdup(orighost); | |
922 | for (cp = host; *cp; cp++) | |
923 | if (isupper(*cp)) | |
924 | *cp = tolower(*cp); | |
925 | ||
926 | /* Exchange protocol version identification strings with the server. */ | |
927 | ssh_exchange_identification(); | |
928 | ||
929 | /* Put the connection into non-blocking mode. */ | |
930 | packet_set_nonblocking(); | |
931 | ||
7b2ea3a1 | 932 | /* key exchange */ |
7b2ea3a1 | 933 | /* authenticate user */ |
8ce64345 | 934 | if (compat20) { |
935 | ssh_kex2(host, hostaddr); | |
39c00dc2 | 936 | ssh_userauth2(local_user, server_user, host, sensitive); |
8ce64345 | 937 | } else { |
8ce64345 | 938 | ssh_kex(host, hostaddr); |
39c00dc2 | 939 | ssh_userauth1(local_user, server_user, host, sensitive); |
8ce64345 | 940 | } |
7b2ea3a1 | 941 | } |
0ae4fe1d | 942 | |
943 | void | |
944 | ssh_put_password(char *password) | |
945 | { | |
946 | int size; | |
947 | char *padded; | |
948 | ||
99c415db | 949 | if (datafellows & SSH_BUG_PASSWORDPAD) { |
449c5ba5 | 950 | packet_put_cstring(password); |
99c415db | 951 | return; |
952 | } | |
0ae4fe1d | 953 | size = roundup(strlen(password) + 1, 32); |
954 | padded = xmalloc(size); | |
955 | memset(padded, 0, size); | |
956 | strlcpy(padded, password, size); | |
957 | packet_put_string(padded, size); | |
958 | memset(padded, 0, size); | |
959 | xfree(padded); | |
960 | } | |
8a48a7ef | 961 | |
962 | static int | |
963 | show_key_from_file(const char *file, const char *host, int keytype) | |
964 | { | |
965 | Key *found; | |
966 | char *fp; | |
967 | int line, ret; | |
968 | ||
969 | found = key_new(keytype); | |
970 | if ((ret = lookup_key_in_hostfile_by_type(file, host, | |
971 | keytype, found, &line))) { | |
972 | fp = key_fingerprint(found, SSH_FP_MD5, SSH_FP_HEX); | |
bbe88b6d | 973 | logit("WARNING: %s key found for host %s\n" |
567a05bf | 974 | "in %s:%d\n" |
8a48a7ef | 975 | "%s key fingerprint %s.", |
976 | key_type(found), host, file, line, | |
977 | key_type(found), fp); | |
978 | xfree(fp); | |
979 | } | |
980 | key_free(found); | |
981 | return (ret); | |
982 | } | |
983 | ||
984 | /* print all known host keys for a given host, but skip keys of given type */ | |
985 | static int | |
986 | show_other_keys(const char *host, Key *key) | |
987 | { | |
988 | int type[] = { KEY_RSA1, KEY_RSA, KEY_DSA, -1}; | |
989 | int i, found = 0; | |
990 | ||
991 | for (i = 0; type[i] != -1; i++) { | |
992 | if (type[i] == key->type) | |
993 | continue; | |
994 | if (type[i] != KEY_RSA1 && | |
995 | show_key_from_file(options.user_hostfile2, host, type[i])) { | |
996 | found = 1; | |
997 | continue; | |
998 | } | |
999 | if (type[i] != KEY_RSA1 && | |
1000 | show_key_from_file(options.system_hostfile2, host, type[i])) { | |
1001 | found = 1; | |
1002 | continue; | |
1003 | } | |
1004 | if (show_key_from_file(options.user_hostfile, host, type[i])) { | |
1005 | found = 1; | |
1006 | continue; | |
1007 | } | |
1008 | if (show_key_from_file(options.system_hostfile, host, type[i])) { | |
1009 | found = 1; | |
1010 | continue; | |
1011 | } | |
1012 | debug2("no key of type %d for host %s", type[i], host); | |
1013 | } | |
1014 | return (found); | |
1015 | } | |
1a1bc5d5 | 1016 | |
1017 | static void | |
1018 | warn_changed_key(Key *host_key) | |
1019 | { | |
1020 | char *fp; | |
f5da7f70 | 1021 | const char *type = key_type(host_key); |
1a1bc5d5 | 1022 | |
1023 | fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX); | |
1024 | ||
1025 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
1026 | error("@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @"); | |
1027 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
1028 | error("IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!"); | |
1029 | error("Someone could be eavesdropping on you right now (man-in-the-middle attack)!"); | |
1030 | error("It is also possible that the %s host key has just been changed.", type); | |
1031 | error("The fingerprint for the %s key sent by the remote host is\n%s.", | |
1032 | type, fp); | |
1033 | error("Please contact your system administrator."); | |
1034 | ||
1035 | xfree(fp); | |
1a1bc5d5 | 1036 | } |