]>
Commit | Line | Data |
---|---|---|
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" | |
cf039bd1 | 16 | RCSID("$OpenBSD: sshconnect.c,v 1.159 2005/01/05 08:51:32 markus 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" | |
8efc0c15 | 34 | |
21289cd0 | 35 | #include "dns.h" |
21289cd0 | 36 | |
a306f2dd | 37 | char *client_version_string = NULL; |
38 | char *server_version_string = NULL; | |
8ce64345 | 39 | |
0161a13d | 40 | int matching_host_key_dns = 0; |
1432b5c4 | 41 | |
3fb156df | 42 | /* import */ |
57112b5a | 43 | extern Options options; |
48e671d5 | 44 | extern char *__progname; |
3fb156df | 45 | extern uid_t original_real_uid; |
46 | extern uid_t original_effective_uid; | |
6939bbd4 | 47 | extern pid_t proxy_command_pid; |
57112b5a | 48 | |
a704dd54 | 49 | #ifndef INET6_ADDRSTRLEN /* for non IPv6 machines */ |
50 | #define INET6_ADDRSTRLEN 46 | |
51 | #endif | |
52 | ||
8a48a7ef | 53 | static int show_other_keys(const char *, Key *); |
1a1bc5d5 | 54 | static void warn_changed_key(Key *); |
8a48a7ef | 55 | |
5260325f | 56 | /* |
57 | * Connect to the given ssh server using a proxy command. | |
58 | */ | |
396c147e | 59 | static int |
3fb156df | 60 | ssh_proxy_connect(const char *host, u_short port, const char *proxy_command) |
8efc0c15 | 61 | { |
5260325f | 62 | Buffer command; |
63 | const char *cp; | |
64 | char *command_string; | |
65 | int pin[2], pout[2]; | |
9da5c3c9 | 66 | pid_t pid; |
48e671d5 | 67 | char strport[NI_MAXSERV]; |
5260325f | 68 | |
69 | /* Convert the port number into a string. */ | |
48e671d5 | 70 | snprintf(strport, sizeof strport, "%hu", port); |
5260325f | 71 | |
6939bbd4 | 72 | /* |
73 | * Build the final command string in the buffer by making the | |
74 | * appropriate substitutions to the given proxy command. | |
75 | * | |
aff51935 | 76 | * Use "exec" to avoid "sh -c" processes on some platforms |
6939bbd4 | 77 | * (e.g. Solaris) |
78 | */ | |
5260325f | 79 | buffer_init(&command); |
6939bbd4 | 80 | buffer_append(&command, "exec ", 5); |
81 | ||
5260325f | 82 | for (cp = proxy_command; *cp; cp++) { |
83 | if (cp[0] == '%' && cp[1] == '%') { | |
84 | buffer_append(&command, "%", 1); | |
85 | cp++; | |
86 | continue; | |
87 | } | |
88 | if (cp[0] == '%' && cp[1] == 'h') { | |
89 | buffer_append(&command, host, strlen(host)); | |
90 | cp++; | |
91 | continue; | |
92 | } | |
93 | if (cp[0] == '%' && cp[1] == 'p') { | |
48e671d5 | 94 | buffer_append(&command, strport, strlen(strport)); |
5260325f | 95 | cp++; |
96 | continue; | |
97 | } | |
98 | buffer_append(&command, cp, 1); | |
8efc0c15 | 99 | } |
5260325f | 100 | buffer_append(&command, "\0", 1); |
101 | ||
102 | /* Get the final command string. */ | |
103 | command_string = buffer_ptr(&command); | |
104 | ||
105 | /* Create pipes for communicating with the proxy. */ | |
106 | if (pipe(pin) < 0 || pipe(pout) < 0) | |
107 | fatal("Could not create pipes to communicate with the proxy: %.100s", | |
184eed6a | 108 | strerror(errno)); |
5260325f | 109 | |
110 | debug("Executing proxy command: %.500s", command_string); | |
111 | ||
112 | /* Fork and execute the proxy command. */ | |
113 | if ((pid = fork()) == 0) { | |
114 | char *argv[10]; | |
115 | ||
116 | /* Child. Permanently give up superuser privileges. */ | |
3fb156df | 117 | seteuid(original_real_uid); |
118 | setuid(original_real_uid); | |
5260325f | 119 | |
120 | /* Redirect stdin and stdout. */ | |
121 | close(pin[1]); | |
122 | if (pin[0] != 0) { | |
123 | if (dup2(pin[0], 0) < 0) | |
124 | perror("dup2 stdin"); | |
125 | close(pin[0]); | |
126 | } | |
127 | close(pout[0]); | |
128 | if (dup2(pout[1], 1) < 0) | |
129 | perror("dup2 stdout"); | |
130 | /* Cannot be 1 because pin allocated two descriptors. */ | |
131 | close(pout[1]); | |
132 | ||
133 | /* Stderr is left as it is so that error messages get | |
134 | printed on the user's terminal. */ | |
30228d7c | 135 | argv[0] = _PATH_BSHELL; |
5260325f | 136 | argv[1] = "-c"; |
137 | argv[2] = command_string; | |
138 | argv[3] = NULL; | |
139 | ||
140 | /* Execute the proxy command. Note that we gave up any | |
141 | extra privileges above. */ | |
328654d8 | 142 | execv(argv[0], argv); |
143 | perror(argv[0]); | |
5260325f | 144 | exit(1); |
8efc0c15 | 145 | } |
5260325f | 146 | /* Parent. */ |
147 | if (pid < 0) | |
148 | fatal("fork failed: %.100s", strerror(errno)); | |
6939bbd4 | 149 | else |
150 | proxy_command_pid = pid; /* save pid to clean up later */ | |
5260325f | 151 | |
152 | /* Close child side of the descriptors. */ | |
153 | close(pin[0]); | |
154 | close(pout[1]); | |
155 | ||
156 | /* Free the command name. */ | |
157 | buffer_free(&command); | |
158 | ||
159 | /* Set the connection file descriptors. */ | |
160 | packet_set_connection(pout[0], pin[1]); | |
8efc0c15 | 161 | |
ce773142 | 162 | /* Indicate OK return */ |
163 | return 0; | |
5260325f | 164 | } |
8efc0c15 | 165 | |
5260325f | 166 | /* |
167 | * Creates a (possibly privileged) socket for use as the ssh connection. | |
168 | */ | |
396c147e | 169 | static int |
3e131a6d | 170 | ssh_create_socket(int privileged, struct addrinfo *ai) |
8efc0c15 | 171 | { |
3435f5a6 | 172 | int sock, gaierr; |
173 | struct addrinfo hints, *res; | |
5260325f | 174 | |
aa3378df | 175 | /* |
176 | * If we are running as root and want to connect to a privileged | |
177 | * port, bind our own socket to a privileged port. | |
178 | */ | |
5260325f | 179 | if (privileged) { |
180 | int p = IPPORT_RESERVED - 1; | |
3fb156df | 181 | PRIV_START; |
3e131a6d | 182 | sock = rresvport_af(&p, ai->ai_family); |
3fb156df | 183 | PRIV_END; |
5260325f | 184 | if (sock < 0) |
3e131a6d | 185 | error("rresvport: af=%d %.100s", ai->ai_family, |
186 | strerror(errno)); | |
c8d54615 | 187 | else |
188 | debug("Allocated local port %d.", p); | |
3435f5a6 | 189 | return sock; |
190 | } | |
3e131a6d | 191 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
3435f5a6 | 192 | if (sock < 0) |
193 | error("socket: %.100s", strerror(errno)); | |
3435f5a6 | 194 | |
195 | /* Bind the socket to an alternative local IP address */ | |
196 | if (options.bind_address == NULL) | |
197 | return sock; | |
198 | ||
199 | memset(&hints, 0, sizeof(hints)); | |
3e131a6d | 200 | hints.ai_family = ai->ai_family; |
201 | hints.ai_socktype = ai->ai_socktype; | |
202 | hints.ai_protocol = ai->ai_protocol; | |
3435f5a6 | 203 | hints.ai_flags = AI_PASSIVE; |
204 | gaierr = getaddrinfo(options.bind_address, "0", &hints, &res); | |
205 | if (gaierr) { | |
206 | error("getaddrinfo: %s: %s", options.bind_address, | |
207 | gai_strerror(gaierr)); | |
208 | close(sock); | |
209 | return -1; | |
210 | } | |
211 | if (bind(sock, res->ai_addr, res->ai_addrlen) < 0) { | |
212 | error("bind: %s: %s", options.bind_address, strerror(errno)); | |
213 | close(sock); | |
214 | freeaddrinfo(res); | |
215 | return -1; | |
5260325f | 216 | } |
3435f5a6 | 217 | freeaddrinfo(res); |
5260325f | 218 | return sock; |
8efc0c15 | 219 | } |
220 | ||
09ab3296 | 221 | static int |
222 | timeout_connect(int sockfd, const struct sockaddr *serv_addr, | |
223 | socklen_t addrlen, int timeout) | |
224 | { | |
225 | fd_set *fdset; | |
226 | struct timeval tv; | |
227 | socklen_t optlen; | |
da54f5be | 228 | int fdsetsz, optval, rc, result = -1; |
09ab3296 | 229 | |
230 | if (timeout <= 0) | |
231 | return (connect(sockfd, serv_addr, addrlen)); | |
232 | ||
2daf1db1 | 233 | set_nonblock(sockfd); |
09ab3296 | 234 | rc = connect(sockfd, serv_addr, addrlen); |
2daf1db1 | 235 | if (rc == 0) { |
236 | unset_nonblock(sockfd); | |
09ab3296 | 237 | return (0); |
2daf1db1 | 238 | } |
09ab3296 | 239 | if (errno != EINPROGRESS) |
240 | return (-1); | |
241 | ||
242 | fdsetsz = howmany(sockfd + 1, NFDBITS) * sizeof(fd_mask); | |
243 | fdset = (fd_set *)xmalloc(fdsetsz); | |
244 | ||
7caca6d4 | 245 | memset(fdset, 0, fdsetsz); |
09ab3296 | 246 | FD_SET(sockfd, fdset); |
247 | tv.tv_sec = timeout; | |
248 | tv.tv_usec = 0; | |
249 | ||
250 | for(;;) { | |
251 | rc = select(sockfd + 1, NULL, fdset, NULL, &tv); | |
252 | if (rc != -1 || errno != EINTR) | |
253 | break; | |
254 | } | |
255 | ||
256 | switch(rc) { | |
257 | case 0: | |
258 | /* Timed out */ | |
259 | errno = ETIMEDOUT; | |
da54f5be | 260 | break; |
09ab3296 | 261 | case -1: |
262 | /* Select error */ | |
aff51935 | 263 | debug("select: %s", strerror(errno)); |
da54f5be | 264 | break; |
09ab3296 | 265 | case 1: |
266 | /* Completed or failed */ | |
267 | optval = 0; | |
268 | optlen = sizeof(optval); | |
aff51935 | 269 | if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval, |
ce26c02a | 270 | &optlen) == -1) { |
aff51935 | 271 | debug("getsockopt: %s", strerror(errno)); |
da54f5be | 272 | break; |
ce26c02a | 273 | } |
09ab3296 | 274 | if (optval != 0) { |
275 | errno = optval; | |
da54f5be | 276 | break; |
09ab3296 | 277 | } |
da54f5be | 278 | result = 0; |
2daf1db1 | 279 | unset_nonblock(sockfd); |
09ab3296 | 280 | break; |
281 | default: | |
282 | /* Should not occur */ | |
283 | fatal("Bogus return (%d) from select()", rc); | |
284 | } | |
285 | ||
da54f5be | 286 | xfree(fdset); |
287 | return (result); | |
09ab3296 | 288 | } |
289 | ||
5260325f | 290 | /* |
48e671d5 | 291 | * Opens a TCP/IP connection to the remote server on the given host. |
292 | * The address of the remote host will be returned in hostaddr. | |
3fb156df | 293 | * If port is 0, the default port will be used. If needpriv is true, |
5260325f | 294 | * a privileged port will be allocated to make the connection. |
3fb156df | 295 | * This requires super-user privileges if needpriv is true. |
5260325f | 296 | * Connection_attempts specifies the maximum number of tries (one per |
297 | * second). If proxy_command is non-NULL, it specifies the command (with %h | |
298 | * and %p substituted for host and port, respectively) to use to contact | |
299 | * the daemon. | |
300 | */ | |
301 | int | |
48e671d5 | 302 | ssh_connect(const char *host, struct sockaddr_storage * hostaddr, |
dab89049 | 303 | u_short port, int family, int connection_attempts, |
3fb156df | 304 | int needpriv, const char *proxy_command) |
8efc0c15 | 305 | { |
b5c334cc | 306 | int gaierr; |
307 | int on = 1; | |
48e671d5 | 308 | int sock = -1, attempt; |
48e671d5 | 309 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
b5c334cc | 310 | struct addrinfo hints, *ai, *aitop; |
b5c334cc | 311 | struct servent *sp; |
5260325f | 312 | |
a77673cc | 313 | debug2("ssh_connect: needpriv %d", needpriv); |
5260325f | 314 | |
315 | /* Get default port if port has not been set. */ | |
316 | if (port == 0) { | |
317 | sp = getservbyname(SSH_SERVICE_NAME, "tcp"); | |
318 | if (sp) | |
319 | port = ntohs(sp->s_port); | |
320 | else | |
321 | port = SSH_DEFAULT_PORT; | |
8efc0c15 | 322 | } |
5260325f | 323 | /* If a proxy command is given, connect using it. */ |
324 | if (proxy_command != NULL) | |
3fb156df | 325 | return ssh_proxy_connect(host, port, proxy_command); |
5260325f | 326 | |
327 | /* No proxy command. */ | |
328 | ||
48e671d5 | 329 | memset(&hints, 0, sizeof(hints)); |
dab89049 | 330 | hints.ai_family = family; |
48e671d5 | 331 | hints.ai_socktype = SOCK_STREAM; |
d6133f43 | 332 | snprintf(strport, sizeof strport, "%u", port); |
48e671d5 | 333 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) |
334 | fatal("%s: %.100s: %s", __progname, host, | |
335 | gai_strerror(gaierr)); | |
5260325f | 336 | |
95f1eccc | 337 | /* |
338 | * Try to connect several times. On some machines, the first time | |
339 | * will sometimes fail. In general socket code appears to behave | |
340 | * quite magically on many machines. | |
ce773142 | 341 | */ |
342 | for (attempt = 0; ;) { | |
5260325f | 343 | if (attempt > 0) |
344 | debug("Trying again..."); | |
345 | ||
48e671d5 | 346 | /* Loop through addresses for this host, and try each one in |
6ae2364d | 347 | sequence until the connection succeeds. */ |
48e671d5 | 348 | for (ai = aitop; ai; ai = ai->ai_next) { |
349 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
350 | continue; | |
351 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, | |
352 | ntop, sizeof(ntop), strport, sizeof(strport), | |
353 | NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
354 | error("ssh_connect: getnameinfo failed"); | |
355 | continue; | |
356 | } | |
357 | debug("Connecting to %.200s [%.100s] port %s.", | |
358 | host, ntop, strport); | |
359 | ||
360 | /* Create a socket for connecting. */ | |
3e131a6d | 361 | sock = ssh_create_socket(needpriv, ai); |
48e671d5 | 362 | if (sock < 0) |
ce773142 | 363 | /* Any error is already output */ |
48e671d5 | 364 | continue; |
365 | ||
09ab3296 | 366 | if (timeout_connect(sock, ai->ai_addr, ai->ai_addrlen, |
367 | options.connection_timeout) >= 0) { | |
48e671d5 | 368 | /* Successful connection. */ |
cd332296 | 369 | memcpy(hostaddr, ai->ai_addr, ai->ai_addrlen); |
5260325f | 370 | break; |
48e671d5 | 371 | } else { |
c750d869 | 372 | debug("connect to address %s port %s: %s", |
373 | ntop, strport, strerror(errno)); | |
aa3378df | 374 | /* |
375 | * Close the failed socket; there appear to | |
376 | * be some problems when reusing a socket for | |
377 | * which connect() has already returned an | |
378 | * error. | |
379 | */ | |
5260325f | 380 | close(sock); |
381 | } | |
8efc0c15 | 382 | } |
48e671d5 | 383 | if (ai) |
384 | break; /* Successful connection. */ | |
8efc0c15 | 385 | |
ce773142 | 386 | attempt++; |
387 | if (attempt >= connection_attempts) | |
388 | break; | |
5260325f | 389 | /* Sleep a moment before retrying. */ |
390 | sleep(1); | |
391 | } | |
48e671d5 | 392 | |
393 | freeaddrinfo(aitop); | |
394 | ||
5260325f | 395 | /* Return failure if we didn't get a successful connection. */ |
9bd68577 | 396 | if (attempt >= connection_attempts) { |
cf039bd1 | 397 | error("ssh: connect to host %s port %s: %s", |
9bd68577 | 398 | host, strport, strerror(errno)); |
cf039bd1 | 399 | return (-1); |
9bd68577 | 400 | } |
8efc0c15 | 401 | |
5260325f | 402 | debug("Connection established."); |
8efc0c15 | 403 | |
fd573618 | 404 | /* Set SO_KEEPALIVE if requested. */ |
405 | if (options.tcp_keep_alive && | |
b5c334cc | 406 | setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, |
407 | sizeof(on)) < 0) | |
408 | error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno)); | |
8efc0c15 | 409 | |
5260325f | 410 | /* Set the connection. */ |
411 | packet_set_connection(sock, sock); | |
8efc0c15 | 412 | |
ce773142 | 413 | return 0; |
8efc0c15 | 414 | } |
415 | ||
5260325f | 416 | /* |
417 | * Waits for the server identification string, and sends our own | |
418 | * identification string. | |
419 | */ | |
396c147e | 420 | static void |
5ca51e19 | 421 | ssh_exchange_identification(void) |
8efc0c15 | 422 | { |
5260325f | 423 | char buf[256], remote_version[256]; /* must be same size! */ |
a8be9f80 | 424 | int remote_major, remote_minor, i, mismatch; |
5260325f | 425 | int connection_in = packet_get_connection_in(); |
426 | int connection_out = packet_get_connection_out(); | |
2b87da3b | 427 | int minor1 = PROTOCOL_MINOR_1; |
5260325f | 428 | |
429 | /* Read other side\'s version identification. */ | |
38c295d6 | 430 | for (;;) { |
431 | for (i = 0; i < sizeof(buf) - 1; i++) { | |
432 | int len = atomicio(read, connection_in, &buf[i], 1); | |
433 | if (len < 0) | |
434 | fatal("ssh_exchange_identification: read: %.100s", strerror(errno)); | |
435 | if (len != 1) | |
436 | fatal("ssh_exchange_identification: Connection closed by remote host"); | |
437 | if (buf[i] == '\r') { | |
438 | buf[i] = '\n'; | |
439 | buf[i + 1] = 0; | |
440 | continue; /**XXX wait for \n */ | |
441 | } | |
442 | if (buf[i] == '\n') { | |
443 | buf[i + 1] = 0; | |
444 | break; | |
445 | } | |
5260325f | 446 | } |
38c295d6 | 447 | buf[sizeof(buf) - 1] = 0; |
448 | if (strncmp(buf, "SSH-", 4) == 0) | |
5260325f | 449 | break; |
38c295d6 | 450 | debug("ssh_exchange_identification: %s", buf); |
8efc0c15 | 451 | } |
8ce64345 | 452 | server_version_string = xstrdup(buf); |
5260325f | 453 | |
aa3378df | 454 | /* |
455 | * Check that the versions match. In future this might accept | |
456 | * several versions and set appropriate flags to handle them. | |
457 | */ | |
8ce64345 | 458 | if (sscanf(server_version_string, "SSH-%d.%d-%[^\n]\n", |
459 | &remote_major, &remote_minor, remote_version) != 3) | |
5260325f | 460 | fatal("Bad remote protocol version identification: '%.100s'", buf); |
461 | debug("Remote protocol version %d.%d, remote software version %.100s", | |
184eed6a | 462 | remote_major, remote_minor, remote_version); |
5260325f | 463 | |
8ce64345 | 464 | compat_datafellows(remote_version); |
a8be9f80 | 465 | mismatch = 0; |
466 | ||
6aacefa7 | 467 | switch (remote_major) { |
a8be9f80 | 468 | case 1: |
469 | if (remote_minor == 99 && | |
470 | (options.protocol & SSH_PROTO_2) && | |
471 | !(options.protocol & SSH_PROTO_1_PREFERRED)) { | |
472 | enable_compat20(); | |
473 | break; | |
5260325f | 474 | } |
a8be9f80 | 475 | if (!(options.protocol & SSH_PROTO_1)) { |
476 | mismatch = 1; | |
477 | break; | |
478 | } | |
479 | if (remote_minor < 3) { | |
480 | fatal("Remote machine has too old SSH software version."); | |
fa08c86b | 481 | } else if (remote_minor == 3 || remote_minor == 4) { |
a8be9f80 | 482 | /* We speak 1.3, too. */ |
483 | enable_compat13(); | |
fa08c86b | 484 | minor1 = 3; |
a8be9f80 | 485 | if (options.forward_agent) { |
bbe88b6d | 486 | logit("Agent forwarding disabled for protocol 1.3"); |
a8be9f80 | 487 | options.forward_agent = 0; |
488 | } | |
489 | } | |
490 | break; | |
491 | case 2: | |
492 | if (options.protocol & SSH_PROTO_2) { | |
493 | enable_compat20(); | |
494 | break; | |
495 | } | |
496 | /* FALLTHROUGH */ | |
6ae2364d | 497 | default: |
a8be9f80 | 498 | mismatch = 1; |
499 | break; | |
8efc0c15 | 500 | } |
a8be9f80 | 501 | if (mismatch) |
5260325f | 502 | fatal("Protocol major versions differ: %d vs. %d", |
a8be9f80 | 503 | (options.protocol & SSH_PROTO_2) ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1, |
504 | remote_major); | |
5260325f | 505 | /* Send our own protocol version identification. */ |
506 | snprintf(buf, sizeof buf, "SSH-%d.%d-%.100s\n", | |
a8be9f80 | 507 | compat20 ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1, |
fa08c86b | 508 | compat20 ? PROTOCOL_MINOR_2 : minor1, |
8ce64345 | 509 | SSH_VERSION); |
dc54438a | 510 | if (atomicio(vwrite, connection_out, buf, strlen(buf)) != strlen(buf)) |
5260325f | 511 | fatal("write: %.100s", strerror(errno)); |
8ce64345 | 512 | client_version_string = xstrdup(buf); |
513 | chop(client_version_string); | |
514 | chop(server_version_string); | |
515 | debug("Local version string %.100s", client_version_string); | |
8efc0c15 | 516 | } |
517 | ||
f21032a6 | 518 | /* defaults to 'no' */ |
396c147e | 519 | static int |
a2c92c4a | 520 | confirm(const char *prompt) |
8efc0c15 | 521 | { |
616a6b93 | 522 | const char *msg, *again = "Please type 'yes' or 'no': "; |
523 | char *p; | |
524 | int ret = -1; | |
5260325f | 525 | |
f21032a6 | 526 | if (options.batch_mode) |
527 | return 0; | |
616a6b93 | 528 | for (msg = prompt;;msg = again) { |
529 | p = read_passphrase(msg, RP_ECHO); | |
530 | if (p == NULL || | |
531 | (p[0] == '\0') || (p[0] == '\n') || | |
532 | strncasecmp(p, "no", 2) == 0) | |
533 | ret = 0; | |
f11fe301 | 534 | if (p && strncasecmp(p, "yes", 3) == 0) |
616a6b93 | 535 | ret = 1; |
536 | if (p) | |
537 | xfree(p); | |
538 | if (ret != -1) | |
539 | return ret; | |
8efc0c15 | 540 | } |
8efc0c15 | 541 | } |
542 | ||
5260325f | 543 | /* |
f49bc4f7 | 544 | * check whether the supplied host key is valid, return -1 if the key |
545 | * is not valid. the user_hostfile will not be updated if 'readonly' is true. | |
5260325f | 546 | */ |
396c147e | 547 | static int |
a306f2dd | 548 | check_host_key(char *host, struct sockaddr *hostaddr, Key *host_key, |
f49bc4f7 | 549 | int readonly, const char *user_hostfile, const char *system_hostfile) |
8efc0c15 | 550 | { |
4fe2af09 | 551 | Key *file_key; |
b6c7b7b7 | 552 | const char *type = key_type(host_key); |
95f1eccc | 553 | char *ip = NULL; |
22138a36 | 554 | char hostline[1000], *hostp, *fp; |
5260325f | 555 | HostStatus host_status; |
556 | HostStatus ip_status; | |
48e671d5 | 557 | int local = 0, host_ip_differ = 0; |
20af321f | 558 | int salen; |
48e671d5 | 559 | char ntop[NI_MAXHOST]; |
616a6b93 | 560 | char msg[1024]; |
1432b5c4 | 561 | int len, host_line, ip_line; |
1e3b8b07 | 562 | const char *host_file = NULL, *ip_file = NULL; |
48e671d5 | 563 | |
564 | /* | |
565 | * Force accepting of the host key for loopback/localhost. The | |
566 | * problem is that if the home directory is NFS-mounted to multiple | |
567 | * machines, localhost will refer to a different machine in each of | |
568 | * them, and the user will get bogus HOST_CHANGED warnings. This | |
569 | * essentially disables host authentication for localhost; however, | |
570 | * this is probably not a real problem. | |
571 | */ | |
a306f2dd | 572 | /** hostaddr == 0! */ |
48e671d5 | 573 | switch (hostaddr->sa_family) { |
574 | case AF_INET: | |
f49bc4f7 | 575 | local = (ntohl(((struct sockaddr_in *)hostaddr)-> |
20a11d35 | 576 | sin_addr.s_addr) >> 24) == IN_LOOPBACKNET; |
20af321f | 577 | salen = sizeof(struct sockaddr_in); |
48e671d5 | 578 | break; |
579 | case AF_INET6: | |
f49bc4f7 | 580 | local = IN6_IS_ADDR_LOOPBACK( |
581 | &(((struct sockaddr_in6 *)hostaddr)->sin6_addr)); | |
20af321f | 582 | salen = sizeof(struct sockaddr_in6); |
48e671d5 | 583 | break; |
584 | default: | |
585 | local = 0; | |
20af321f | 586 | salen = sizeof(struct sockaddr_storage); |
48e671d5 | 587 | break; |
588 | } | |
8bbc048a | 589 | if (options.no_host_authentication_for_localhost == 1 && local && |
590 | options.host_key_alias == NULL) { | |
7c49df64 | 591 | debug("Forcing accepting of host key for " |
592 | "loopback/localhost."); | |
f49bc4f7 | 593 | return 0; |
48e671d5 | 594 | } |
5260325f | 595 | |
57112b5a | 596 | /* |
7c49df64 | 597 | * We don't have the remote ip-address for connections |
598 | * using a proxy command | |
599 | */ | |
600 | if (options.proxy_command == NULL) { | |
601 | if (getnameinfo(hostaddr, salen, ntop, sizeof(ntop), | |
602 | NULL, 0, NI_NUMERICHOST) != 0) | |
603 | fatal("check_host_key: getnameinfo failed"); | |
604 | ip = xstrdup(ntop); | |
605 | } else { | |
606 | ip = xstrdup("<no hostip for proxy command>"); | |
607 | } | |
608 | /* | |
609 | * Turn off check_host_ip if the connection is to localhost, via proxy | |
610 | * command or if we don't have a hostname to compare with | |
57112b5a | 611 | */ |
7c49df64 | 612 | if (options.check_host_ip && |
613 | (local || strcmp(host, ip) == 0 || options.proxy_command != NULL)) | |
57112b5a | 614 | options.check_host_ip = 0; |
615 | ||
8abcdba4 | 616 | /* |
7c49df64 | 617 | * Allow the user to record the key under a different name. This is |
8abcdba4 | 618 | * useful for ssh tunneling over forwarded connections or if you run |
7c49df64 | 619 | * multiple sshd's on different ports on the same machine. |
8abcdba4 | 620 | */ |
621 | if (options.host_key_alias != NULL) { | |
622 | host = options.host_key_alias; | |
623 | debug("using hostkeyalias: %s", host); | |
624 | } | |
625 | ||
95f1eccc | 626 | /* |
627 | * Store the host key from the known host file in here so that we can | |
628 | * compare it with the key for the IP address. | |
629 | */ | |
4fe2af09 | 630 | file_key = key_new(host_key->type); |
5260325f | 631 | |
aa3378df | 632 | /* |
633 | * Check if the host key is present in the user\'s list of known | |
634 | * hosts or in the systemwide list. | |
635 | */ | |
1e3b8b07 | 636 | host_file = user_hostfile; |
f49bc4f7 | 637 | host_status = check_host_in_hostfile(host_file, host, host_key, |
184eed6a | 638 | file_key, &host_line); |
1e3b8b07 | 639 | if (host_status == HOST_NEW) { |
640 | host_file = system_hostfile; | |
f49bc4f7 | 641 | host_status = check_host_in_hostfile(host_file, host, host_key, |
642 | file_key, &host_line); | |
1e3b8b07 | 643 | } |
aa3378df | 644 | /* |
645 | * Also perform check for the ip address, skip the check if we are | |
646 | * localhost or the hostname was an ip address to begin with | |
647 | */ | |
7c49df64 | 648 | if (options.check_host_ip) { |
4fe2af09 | 649 | Key *ip_key = key_new(host_key->type); |
5260325f | 650 | |
1e3b8b07 | 651 | ip_file = user_hostfile; |
f49bc4f7 | 652 | ip_status = check_host_in_hostfile(ip_file, ip, host_key, |
653 | ip_key, &ip_line); | |
1e3b8b07 | 654 | if (ip_status == HOST_NEW) { |
655 | ip_file = system_hostfile; | |
f49bc4f7 | 656 | ip_status = check_host_in_hostfile(ip_file, ip, |
657 | host_key, ip_key, &ip_line); | |
1e3b8b07 | 658 | } |
5260325f | 659 | if (host_status == HOST_CHANGED && |
4fe2af09 | 660 | (ip_status != HOST_CHANGED || !key_equal(ip_key, file_key))) |
5260325f | 661 | host_ip_differ = 1; |
662 | ||
4fe2af09 | 663 | key_free(ip_key); |
5260325f | 664 | } else |
665 | ip_status = host_status; | |
666 | ||
4fe2af09 | 667 | key_free(file_key); |
5260325f | 668 | |
669 | switch (host_status) { | |
670 | case HOST_OK: | |
671 | /* The host is known and the key matches. */ | |
1d1ffb87 | 672 | debug("Host '%.200s' is known and matches the %s host key.", |
673 | host, type); | |
1e3b8b07 | 674 | debug("Found key in %s:%d", host_file, host_line); |
7c49df64 | 675 | if (options.check_host_ip && ip_status == HOST_NEW) { |
f49bc4f7 | 676 | if (readonly) |
bbe88b6d | 677 | logit("%s host key for IP address " |
f49bc4f7 | 678 | "'%.128s' not in list of known hosts.", |
7c49df64 | 679 | type, ip); |
f49bc4f7 | 680 | else if (!add_host_to_hostfile(user_hostfile, ip, |
184eed6a | 681 | host_key)) |
bbe88b6d | 682 | logit("Failed to add the %s host key for IP " |
f49bc4f7 | 683 | "address '%.128s' to the list of known " |
684 | "hosts (%.30s).", type, ip, user_hostfile); | |
685 | else | |
bbe88b6d | 686 | logit("Warning: Permanently added the %s host " |
f49bc4f7 | 687 | "key for IP address '%.128s' to the list " |
688 | "of known hosts.", type, ip); | |
5260325f | 689 | } |
690 | break; | |
691 | case HOST_NEW: | |
f49bc4f7 | 692 | if (readonly) |
693 | goto fail; | |
5260325f | 694 | /* The host is new. */ |
695 | if (options.strict_host_key_checking == 1) { | |
f49bc4f7 | 696 | /* |
697 | * User has requested strict host key checking. We | |
698 | * will not add the host key automatically. The only | |
699 | * alternative left is to abort. | |
700 | */ | |
701 | error("No %s host key is known for %.200s and you " | |
702 | "have requested strict checking.", type, host); | |
703 | goto fail; | |
5260325f | 704 | } else if (options.strict_host_key_checking == 2) { |
1432b5c4 | 705 | char msg1[1024], msg2[1024]; |
706 | ||
707 | if (show_other_keys(host, host_key)) | |
708 | snprintf(msg1, sizeof(msg1), | |
709 | "\nbut keys of different type are already" | |
710 | " known for this host."); | |
711 | else | |
712 | snprintf(msg1, sizeof(msg1), "."); | |
5260325f | 713 | /* The default */ |
22138a36 | 714 | fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX); |
1432b5c4 | 715 | msg2[0] = '\0'; |
1432b5c4 | 716 | if (options.verify_host_key_dns) { |
0161a13d | 717 | if (matching_host_key_dns) |
1432b5c4 | 718 | snprintf(msg2, sizeof(msg2), |
719 | "Matching host key fingerprint" | |
720 | " found in DNS.\n"); | |
721 | else | |
722 | snprintf(msg2, sizeof(msg2), | |
723 | "No matching host key fingerprint" | |
724 | " found in DNS.\n"); | |
725 | } | |
616a6b93 | 726 | snprintf(msg, sizeof(msg), |
f49bc4f7 | 727 | "The authenticity of host '%.200s (%s)' can't be " |
8a48a7ef | 728 | "established%s\n" |
1432b5c4 | 729 | "%s key fingerprint is %s.\n%s" |
f49bc4f7 | 730 | "Are you sure you want to continue connecting " |
8a48a7ef | 731 | "(yes/no)? ", |
1432b5c4 | 732 | host, ip, msg1, type, fp, msg2); |
22138a36 | 733 | xfree(fp); |
616a6b93 | 734 | if (!confirm(msg)) |
f49bc4f7 | 735 | goto fail; |
5260325f | 736 | } |
7c49df64 | 737 | if (options.check_host_ip && ip_status == HOST_NEW) { |
5260325f | 738 | snprintf(hostline, sizeof(hostline), "%s,%s", host, ip); |
739 | hostp = hostline; | |
740 | } else | |
741 | hostp = host; | |
742 | ||
f49bc4f7 | 743 | /* |
744 | * If not in strict mode, add the key automatically to the | |
745 | * local known_hosts file. | |
746 | */ | |
a306f2dd | 747 | if (!add_host_to_hostfile(user_hostfile, hostp, host_key)) |
bbe88b6d | 748 | logit("Failed to add the host to the list of known " |
f49bc4f7 | 749 | "hosts (%.500s).", user_hostfile); |
5260325f | 750 | else |
bbe88b6d | 751 | logit("Warning: Permanently added '%.200s' (%s) to the " |
f49bc4f7 | 752 | "list of known hosts.", hostp, type); |
5260325f | 753 | break; |
754 | case HOST_CHANGED: | |
755 | if (options.check_host_ip && host_ip_differ) { | |
ca75d7de | 756 | char *key_msg; |
5260325f | 757 | if (ip_status == HOST_NEW) |
ca75d7de | 758 | key_msg = "is unknown"; |
5260325f | 759 | else if (ip_status == HOST_OK) |
ca75d7de | 760 | key_msg = "is unchanged"; |
5260325f | 761 | else |
ca75d7de | 762 | key_msg = "has a different value"; |
5260325f | 763 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
764 | error("@ WARNING: POSSIBLE DNS SPOOFING DETECTED! @"); | |
765 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
1d1ffb87 | 766 | error("The %s host key for %s has changed,", type, host); |
5260325f | 767 | error("and the key for the according IP address %s", ip); |
ca75d7de | 768 | error("%s. This could either mean that", key_msg); |
5260325f | 769 | error("DNS SPOOFING is happening or the IP address for the host"); |
1e3b8b07 | 770 | error("and its host key have changed at the same time."); |
7c49df64 | 771 | if (ip_status != HOST_NEW) |
1e3b8b07 | 772 | error("Offending key for IP in %s:%d", ip_file, ip_line); |
5260325f | 773 | } |
774 | /* The host key has changed. */ | |
1a1bc5d5 | 775 | warn_changed_key(host_key); |
5260325f | 776 | error("Add correct host key in %.100s to get rid of this message.", |
8abcdba4 | 777 | user_hostfile); |
1e3b8b07 | 778 | error("Offending key in %s:%d", host_file, host_line); |
5260325f | 779 | |
aa3378df | 780 | /* |
781 | * If strict host key checking is in use, the user will have | |
782 | * to edit the key manually and we can only abort. | |
783 | */ | |
f49bc4f7 | 784 | if (options.strict_host_key_checking) { |
785 | error("%s host key for %.200s has changed and you have " | |
786 | "requested strict checking.", type, host); | |
787 | goto fail; | |
788 | } | |
5260325f | 789 | |
aa3378df | 790 | /* |
791 | * If strict host key checking has not been requested, allow | |
d453a600 | 792 | * the connection but without MITM-able authentication or |
aa3378df | 793 | * agent forwarding. |
794 | */ | |
5260325f | 795 | if (options.password_authentication) { |
f49bc4f7 | 796 | error("Password authentication is disabled to avoid " |
797 | "man-in-the-middle attacks."); | |
5260325f | 798 | options.password_authentication = 0; |
799 | } | |
d453a600 | 800 | if (options.kbd_interactive_authentication) { |
801 | error("Keyboard-interactive authentication is disabled" | |
802 | " to avoid man-in-the-middle attacks."); | |
803 | options.kbd_interactive_authentication = 0; | |
804 | options.challenge_response_authentication = 0; | |
805 | } | |
806 | if (options.challenge_response_authentication) { | |
807 | error("Challenge/response authentication is disabled" | |
808 | " to avoid man-in-the-middle attacks."); | |
809 | options.challenge_response_authentication = 0; | |
810 | } | |
5260325f | 811 | if (options.forward_agent) { |
f49bc4f7 | 812 | error("Agent forwarding is disabled to avoid " |
813 | "man-in-the-middle attacks."); | |
5260325f | 814 | options.forward_agent = 0; |
815 | } | |
0b6fbf03 | 816 | if (options.forward_x11) { |
f49bc4f7 | 817 | error("X11 forwarding is disabled to avoid " |
818 | "man-in-the-middle attacks."); | |
0b6fbf03 | 819 | options.forward_x11 = 0; |
820 | } | |
f49bc4f7 | 821 | if (options.num_local_forwards > 0 || |
822 | options.num_remote_forwards > 0) { | |
823 | error("Port forwarding is disabled to avoid " | |
824 | "man-in-the-middle attacks."); | |
825 | options.num_local_forwards = | |
184eed6a | 826 | options.num_remote_forwards = 0; |
0b6fbf03 | 827 | } |
aa3378df | 828 | /* |
829 | * XXX Should permit the user to change to use the new id. | |
830 | * This could be done by converting the host key to an | |
831 | * identifying sentence, tell that the host identifies itself | |
832 | * by that sentence, and ask the user if he/she whishes to | |
833 | * accept the authentication. | |
834 | */ | |
5260325f | 835 | break; |
8a48a7ef | 836 | case HOST_FOUND: |
837 | fatal("internal error"); | |
838 | break; | |
5260325f | 839 | } |
0b6fbf03 | 840 | |
7c49df64 | 841 | if (options.check_host_ip && host_status != HOST_CHANGED && |
842 | ip_status == HOST_CHANGED) { | |
616a6b93 | 843 | snprintf(msg, sizeof(msg), |
844 | "Warning: the %s host key for '%.200s' " | |
845 | "differs from the key for the IP address '%.128s'" | |
846 | "\nOffending key for IP in %s:%d", | |
847 | type, host, ip, ip_file, ip_line); | |
848 | if (host_status == HOST_OK) { | |
849 | len = strlen(msg); | |
850 | snprintf(msg + len, sizeof(msg) - len, | |
851 | "\nMatching host key in %s:%d", | |
7203d6bb | 852 | host_file, host_line); |
616a6b93 | 853 | } |
7c49df64 | 854 | if (options.strict_host_key_checking == 1) { |
b0545fe6 | 855 | logit("%s", msg); |
f49bc4f7 | 856 | error("Exiting, you have requested strict checking."); |
857 | goto fail; | |
7c49df64 | 858 | } else if (options.strict_host_key_checking == 2) { |
616a6b93 | 859 | strlcat(msg, "\nAre you sure you want " |
860 | "to continue connecting (yes/no)? ", sizeof(msg)); | |
861 | if (!confirm(msg)) | |
f49bc4f7 | 862 | goto fail; |
616a6b93 | 863 | } else { |
b0545fe6 | 864 | logit("%s", msg); |
7c49df64 | 865 | } |
866 | } | |
867 | ||
0b6fbf03 | 868 | xfree(ip); |
f49bc4f7 | 869 | return 0; |
870 | ||
871 | fail: | |
872 | xfree(ip); | |
873 | return -1; | |
874 | } | |
875 | ||
21289cd0 | 876 | /* returns 0 if key verifies or -1 if key does NOT verify */ |
f49bc4f7 | 877 | int |
878 | verify_host_key(char *host, struct sockaddr *hostaddr, Key *host_key) | |
879 | { | |
880 | struct stat st; | |
0161a13d | 881 | int flags = 0; |
f49bc4f7 | 882 | |
0161a13d | 883 | if (options.verify_host_key_dns && |
884 | verify_host_key_dns(host, hostaddr, host_key, &flags) == 0) { | |
885 | ||
886 | if (flags & DNS_VERIFY_FOUND) { | |
887 | ||
888 | if (options.verify_host_key_dns == 1 && | |
889 | flags & DNS_VERIFY_MATCH && | |
890 | flags & DNS_VERIFY_SECURE) | |
891 | return 0; | |
892 | ||
893 | if (flags & DNS_VERIFY_MATCH) { | |
894 | matching_host_key_dns = 1; | |
895 | } else { | |
896 | warn_changed_key(host_key); | |
897 | error("Update the SSHFP RR in DNS with the new " | |
898 | "host key to get rid of this message."); | |
899 | } | |
21289cd0 | 900 | } |
901 | } | |
21289cd0 | 902 | |
f49bc4f7 | 903 | /* return ok if the key can be found in an old keyfile */ |
904 | if (stat(options.system_hostfile2, &st) == 0 || | |
905 | stat(options.user_hostfile2, &st) == 0) { | |
906 | if (check_host_key(host, hostaddr, host_key, /*readonly*/ 1, | |
907 | options.user_hostfile2, options.system_hostfile2) == 0) | |
908 | return 0; | |
909 | } | |
910 | return check_host_key(host, hostaddr, host_key, /*readonly*/ 0, | |
911 | options.user_hostfile, options.system_hostfile); | |
95f1eccc | 912 | } |
913 | ||
8ce64345 | 914 | /* |
a306f2dd | 915 | * Starts a dialog with the server, and authenticates the current user on the |
916 | * server. This does not need any extra privileges. The basic connection | |
917 | * to the server must already have been established before this is called. | |
918 | * If login fails, this function prints an error and never returns. | |
919 | * This function does not require super-user privileges. | |
8ce64345 | 920 | */ |
921 | void | |
39c00dc2 | 922 | ssh_login(Sensitive *sensitive, const char *orighost, |
63bd8c36 | 923 | struct sockaddr *hostaddr, struct passwd *pw) |
8ce64345 | 924 | { |
a306f2dd | 925 | char *host, *cp; |
8ce64345 | 926 | char *server_user, *local_user; |
8ce64345 | 927 | |
8ce64345 | 928 | local_user = xstrdup(pw->pw_name); |
929 | server_user = options.user ? options.user : local_user; | |
930 | ||
7b2ea3a1 | 931 | /* Convert the user-supplied hostname into all lowercase. */ |
932 | host = xstrdup(orighost); | |
933 | for (cp = host; *cp; cp++) | |
934 | if (isupper(*cp)) | |
935 | *cp = tolower(*cp); | |
936 | ||
937 | /* Exchange protocol version identification strings with the server. */ | |
938 | ssh_exchange_identification(); | |
939 | ||
940 | /* Put the connection into non-blocking mode. */ | |
941 | packet_set_nonblocking(); | |
942 | ||
7b2ea3a1 | 943 | /* key exchange */ |
7b2ea3a1 | 944 | /* authenticate user */ |
8ce64345 | 945 | if (compat20) { |
946 | ssh_kex2(host, hostaddr); | |
39c00dc2 | 947 | ssh_userauth2(local_user, server_user, host, sensitive); |
8ce64345 | 948 | } else { |
8ce64345 | 949 | ssh_kex(host, hostaddr); |
39c00dc2 | 950 | ssh_userauth1(local_user, server_user, host, sensitive); |
8ce64345 | 951 | } |
7b2ea3a1 | 952 | } |
0ae4fe1d | 953 | |
954 | void | |
955 | ssh_put_password(char *password) | |
956 | { | |
957 | int size; | |
958 | char *padded; | |
959 | ||
99c415db | 960 | if (datafellows & SSH_BUG_PASSWORDPAD) { |
449c5ba5 | 961 | packet_put_cstring(password); |
99c415db | 962 | return; |
963 | } | |
0ae4fe1d | 964 | size = roundup(strlen(password) + 1, 32); |
965 | padded = xmalloc(size); | |
966 | memset(padded, 0, size); | |
967 | strlcpy(padded, password, size); | |
968 | packet_put_string(padded, size); | |
969 | memset(padded, 0, size); | |
970 | xfree(padded); | |
971 | } | |
8a48a7ef | 972 | |
973 | static int | |
974 | show_key_from_file(const char *file, const char *host, int keytype) | |
975 | { | |
976 | Key *found; | |
977 | char *fp; | |
978 | int line, ret; | |
979 | ||
980 | found = key_new(keytype); | |
981 | if ((ret = lookup_key_in_hostfile_by_type(file, host, | |
982 | keytype, found, &line))) { | |
983 | fp = key_fingerprint(found, SSH_FP_MD5, SSH_FP_HEX); | |
bbe88b6d | 984 | logit("WARNING: %s key found for host %s\n" |
567a05bf | 985 | "in %s:%d\n" |
8a48a7ef | 986 | "%s key fingerprint %s.", |
987 | key_type(found), host, file, line, | |
988 | key_type(found), fp); | |
989 | xfree(fp); | |
990 | } | |
991 | key_free(found); | |
992 | return (ret); | |
993 | } | |
994 | ||
995 | /* print all known host keys for a given host, but skip keys of given type */ | |
996 | static int | |
997 | show_other_keys(const char *host, Key *key) | |
998 | { | |
999 | int type[] = { KEY_RSA1, KEY_RSA, KEY_DSA, -1}; | |
1000 | int i, found = 0; | |
1001 | ||
1002 | for (i = 0; type[i] != -1; i++) { | |
1003 | if (type[i] == key->type) | |
1004 | continue; | |
1005 | if (type[i] != KEY_RSA1 && | |
1006 | show_key_from_file(options.user_hostfile2, host, type[i])) { | |
1007 | found = 1; | |
1008 | continue; | |
1009 | } | |
1010 | if (type[i] != KEY_RSA1 && | |
1011 | show_key_from_file(options.system_hostfile2, host, type[i])) { | |
1012 | found = 1; | |
1013 | continue; | |
1014 | } | |
1015 | if (show_key_from_file(options.user_hostfile, host, type[i])) { | |
1016 | found = 1; | |
1017 | continue; | |
1018 | } | |
1019 | if (show_key_from_file(options.system_hostfile, host, type[i])) { | |
1020 | found = 1; | |
1021 | continue; | |
1022 | } | |
1023 | debug2("no key of type %d for host %s", type[i], host); | |
1024 | } | |
1025 | return (found); | |
1026 | } | |
1a1bc5d5 | 1027 | |
1028 | static void | |
1029 | warn_changed_key(Key *host_key) | |
1030 | { | |
1031 | char *fp; | |
f5da7f70 | 1032 | const char *type = key_type(host_key); |
1a1bc5d5 | 1033 | |
1034 | fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX); | |
1035 | ||
1036 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
1037 | error("@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @"); | |
1038 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
1039 | error("IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!"); | |
1040 | error("Someone could be eavesdropping on you right now (man-in-the-middle attack)!"); | |
1041 | error("It is also possible that the %s host key has just been changed.", type); | |
1042 | error("The fingerprint for the %s key sent by the remote host is\n%s.", | |
1043 | type, fp); | |
1044 | error("Please contact your system administrator."); | |
1045 | ||
1046 | xfree(fp); | |
1a1bc5d5 | 1047 | } |