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fe7dba42 | 1 | /* $OpenBSD: ssh-keyscan.c,v 1.79 2009/10/28 16:38:18 reyk Exp $ */ |
f6fdbddf | 2 | /* |
3 | * Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>. | |
4 | * | |
5 | * Modification and redistribution in source and binary forms is | |
6 | * permitted provided that due credit is given to the author and the | |
aa144206 | 7 | * OpenBSD project by leaving this copyright notice intact. |
f6fdbddf | 8 | */ |
9 | ||
10 | #include "includes.h" | |
876faccd | 11 | |
9fd2a215 | 12 | #include "openbsd-compat/sys-queue.h" |
876faccd | 13 | #include <sys/resource.h> |
e264ac72 | 14 | #ifdef HAVE_SYS_TIME_H |
15 | # include <sys/time.h> | |
16 | #endif | |
00146caa | 17 | |
5e837c7b | 18 | #include <netinet/in.h> |
19 | #include <arpa/inet.h> | |
20 | ||
00146caa | 21 | #include <openssl/bn.h> |
22 | ||
28cb0a43 | 23 | #include <netdb.h> |
403a29ac | 24 | #include <errno.h> |
c8dfff33 | 25 | #include <setjmp.h> |
ffa517a8 | 26 | #include <stdarg.h> |
cf851879 | 27 | #include <stdio.h> |
ffa517a8 | 28 | #include <stdlib.h> |
31652869 | 29 | #include <signal.h> |
00146caa | 30 | #include <string.h> |
5188ba17 | 31 | #include <unistd.h> |
f6fdbddf | 32 | |
f6fdbddf | 33 | #include "xmalloc.h" |
34 | #include "ssh.h" | |
42f11eb2 | 35 | #include "ssh1.h" |
31652869 | 36 | #include "buffer.h" |
f6fdbddf | 37 | #include "key.h" |
31652869 | 38 | #include "cipher.h" |
5061072f | 39 | #include "kex.h" |
40 | #include "compat.h" | |
41 | #include "myproposal.h" | |
42 | #include "packet.h" | |
43 | #include "dispatch.h" | |
42f11eb2 | 44 | #include "log.h" |
2671b47f | 45 | #include "atomicio.h" |
5061072f | 46 | #include "misc.h" |
90a8ae9f | 47 | #include "hostfile.h" |
f6fdbddf | 48 | |
5061072f | 49 | /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. |
50 | Default value is AF_UNSPEC means both IPv4 and IPv6. */ | |
5061072f | 51 | int IPv4or6 = AF_UNSPEC; |
f6fdbddf | 52 | |
5061072f | 53 | int ssh_port = SSH_DEFAULT_PORT; |
a204806b | 54 | |
55 | #define KT_RSA1 1 | |
56 | #define KT_DSA 2 | |
57 | #define KT_RSA 4 | |
58 | ||
c47ff7a6 | 59 | int get_keytypes = KT_RSA; /* Get only RSA keys by default */ |
f6fdbddf | 60 | |
90a8ae9f | 61 | int hash_hosts = 0; /* Hash hostname on output */ |
62 | ||
f6fdbddf | 63 | #define MAXMAXFD 256 |
64 | ||
65 | /* The number of seconds after which to give up on a TCP connection */ | |
66 | int timeout = 5; | |
67 | ||
68 | int maxfd; | |
2671b47f | 69 | #define MAXCON (maxfd - 10) |
f6fdbddf | 70 | |
fe7dba42 | 71 | /* The default routing domain */ |
72 | int scan_rdomain = -1; | |
73 | ||
1fe6a48f | 74 | extern char *__progname; |
ff7fee59 | 75 | fd_set *read_wait; |
52e3daed | 76 | size_t read_wait_nfdset; |
f6fdbddf | 77 | int ncon; |
5061072f | 78 | int nonfatal_fatal = 0; |
79 | jmp_buf kexjmp; | |
4278ff63 | 80 | Key *kexjmp_key; |
f6fdbddf | 81 | |
82 | /* | |
83 | * Keep a connection structure for each file descriptor. The state | |
84 | * associated with file descriptor n is held in fdcon[n]. | |
85 | */ | |
86 | typedef struct Connection { | |
1e3b8b07 | 87 | u_char c_status; /* State of connection on this file desc. */ |
f6fdbddf | 88 | #define CS_UNUSED 0 /* File descriptor unused */ |
89 | #define CS_CON 1 /* Waiting to connect/read greeting */ | |
90 | #define CS_SIZE 2 /* Waiting to read initial packet size */ | |
91 | #define CS_KEYS 3 /* Waiting to read public key packet */ | |
92 | int c_fd; /* Quick lookup: c->c_fd == c - fdcon */ | |
93 | int c_plen; /* Packet length field for ssh packet */ | |
94 | int c_len; /* Total bytes which must be read. */ | |
95 | int c_off; /* Length of data read so far. */ | |
5061072f | 96 | int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */ |
f6fdbddf | 97 | char *c_namebase; /* Address to free for c_name and c_namelist */ |
98 | char *c_name; /* Hostname of connection for errors */ | |
99 | char *c_namelist; /* Pointer to other possible addresses */ | |
100 | char *c_output_name; /* Hostname of connection for output */ | |
101 | char *c_data; /* Data read from this fd */ | |
5061072f | 102 | Kex *c_kex; /* The key-exchange struct for ssh2 */ |
f6fdbddf | 103 | struct timeval c_tv; /* Time at which connection gets aborted */ |
104 | TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */ | |
105 | } con; | |
106 | ||
107 | TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */ | |
108 | con *fdcon; | |
109 | ||
110 | /* | |
111 | * This is just a wrapper around fgets() to make it usable. | |
112 | */ | |
113 | ||
114 | /* Stress-test. Increase this later. */ | |
115 | #define LINEBUF_SIZE 16 | |
116 | ||
117 | typedef struct { | |
118 | char *buf; | |
1e3b8b07 | 119 | u_int size; |
f6fdbddf | 120 | int lineno; |
121 | const char *filename; | |
122 | FILE *stream; | |
123 | void (*errfun) (const char *,...); | |
124 | } Linebuf; | |
125 | ||
396c147e | 126 | static Linebuf * |
f6fdbddf | 127 | Linebuf_alloc(const char *filename, void (*errfun) (const char *,...)) |
128 | { | |
129 | Linebuf *lb; | |
130 | ||
131 | if (!(lb = malloc(sizeof(*lb)))) { | |
132 | if (errfun) | |
f11fe301 | 133 | (*errfun) ("linebuf (%s): malloc failed\n", |
134 | filename ? filename : "(stdin)"); | |
f6fdbddf | 135 | return (NULL); |
136 | } | |
137 | if (filename) { | |
138 | lb->filename = filename; | |
139 | if (!(lb->stream = fopen(filename, "r"))) { | |
b5c334cc | 140 | xfree(lb); |
f6fdbddf | 141 | if (errfun) |
142 | (*errfun) ("%s: %s\n", filename, strerror(errno)); | |
143 | return (NULL); | |
144 | } | |
145 | } else { | |
146 | lb->filename = "(stdin)"; | |
147 | lb->stream = stdin; | |
148 | } | |
149 | ||
6e56dc92 | 150 | if (!(lb->buf = malloc((lb->size = LINEBUF_SIZE)))) { |
f6fdbddf | 151 | if (errfun) |
152 | (*errfun) ("linebuf (%s): malloc failed\n", lb->filename); | |
b5c334cc | 153 | xfree(lb); |
f6fdbddf | 154 | return (NULL); |
155 | } | |
156 | lb->errfun = errfun; | |
157 | lb->lineno = 0; | |
158 | return (lb); | |
159 | } | |
160 | ||
396c147e | 161 | static void |
f6fdbddf | 162 | Linebuf_free(Linebuf * lb) |
163 | { | |
164 | fclose(lb->stream); | |
b5c334cc | 165 | xfree(lb->buf); |
166 | xfree(lb); | |
f6fdbddf | 167 | } |
168 | ||
396c147e | 169 | #if 0 |
170 | static void | |
f6fdbddf | 171 | Linebuf_restart(Linebuf * lb) |
172 | { | |
173 | clearerr(lb->stream); | |
174 | rewind(lb->stream); | |
175 | lb->lineno = 0; | |
176 | } | |
177 | ||
396c147e | 178 | static int |
f6fdbddf | 179 | Linebuf_lineno(Linebuf * lb) |
180 | { | |
181 | return (lb->lineno); | |
182 | } | |
396c147e | 183 | #endif |
f6fdbddf | 184 | |
396c147e | 185 | static char * |
5be2ec5e | 186 | Linebuf_getline(Linebuf * lb) |
f6fdbddf | 187 | { |
2ceb8101 | 188 | size_t n = 0; |
50d2fbbc | 189 | void *p; |
f6fdbddf | 190 | |
191 | lb->lineno++; | |
192 | for (;;) { | |
193 | /* Read a line */ | |
194 | if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) { | |
195 | if (ferror(lb->stream) && lb->errfun) | |
50d2fbbc | 196 | (*lb->errfun)("%s: %s\n", lb->filename, |
778f6940 | 197 | strerror(errno)); |
f6fdbddf | 198 | return (NULL); |
199 | } | |
200 | n = strlen(lb->buf); | |
201 | ||
202 | /* Return it or an error if it fits */ | |
203 | if (n > 0 && lb->buf[n - 1] == '\n') { | |
204 | lb->buf[n - 1] = '\0'; | |
205 | return (lb->buf); | |
206 | } | |
207 | if (n != lb->size - 1) { | |
208 | if (lb->errfun) | |
50d2fbbc | 209 | (*lb->errfun)("%s: skipping incomplete last line\n", |
778f6940 | 210 | lb->filename); |
f6fdbddf | 211 | return (NULL); |
212 | } | |
213 | /* Double the buffer if we need more space */ | |
50d2fbbc | 214 | lb->size *= 2; |
215 | if ((p = realloc(lb->buf, lb->size)) == NULL) { | |
216 | lb->size /= 2; | |
f6fdbddf | 217 | if (lb->errfun) |
50d2fbbc | 218 | (*lb->errfun)("linebuf (%s): realloc failed\n", |
778f6940 | 219 | lb->filename); |
f6fdbddf | 220 | return (NULL); |
221 | } | |
50d2fbbc | 222 | lb->buf = p; |
f6fdbddf | 223 | } |
224 | } | |
225 | ||
396c147e | 226 | static int |
f6fdbddf | 227 | fdlim_get(int hard) |
228 | { | |
f318b98b | 229 | #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE) |
f6fdbddf | 230 | struct rlimit rlfd; |
778f6940 | 231 | |
f6fdbddf | 232 | if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) |
233 | return (-1); | |
234 | if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY) | |
341c3efe | 235 | return SSH_SYSFDMAX; |
f6fdbddf | 236 | else |
237 | return hard ? rlfd.rlim_max : rlfd.rlim_cur; | |
b03bd394 | 238 | #else |
341c3efe | 239 | return SSH_SYSFDMAX; |
b03bd394 | 240 | #endif |
f6fdbddf | 241 | } |
242 | ||
396c147e | 243 | static int |
f6fdbddf | 244 | fdlim_set(int lim) |
245 | { | |
f318b98b | 246 | #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) |
f6fdbddf | 247 | struct rlimit rlfd; |
b03bd394 | 248 | #endif |
41545cb6 | 249 | |
f6fdbddf | 250 | if (lim <= 0) |
251 | return (-1); | |
f318b98b | 252 | #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) |
f6fdbddf | 253 | if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) |
254 | return (-1); | |
255 | rlfd.rlim_cur = lim; | |
256 | if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0) | |
257 | return (-1); | |
b03bd394 | 258 | #elif defined (HAVE_SETDTABLESIZE) |
b705bea0 | 259 | setdtablesize(lim); |
b03bd394 | 260 | #endif |
f6fdbddf | 261 | return (0); |
262 | } | |
263 | ||
264 | /* | |
265 | * This is an strsep function that returns a null field for adjacent | |
266 | * separators. This is the same as the 4.4BSD strsep, but different from the | |
267 | * one in the GNU libc. | |
268 | */ | |
396c147e | 269 | static char * |
f6fdbddf | 270 | xstrsep(char **str, const char *delim) |
271 | { | |
272 | char *s, *e; | |
273 | ||
274 | if (!**str) | |
275 | return (NULL); | |
276 | ||
277 | s = *str; | |
278 | e = s + strcspn(s, delim); | |
279 | ||
280 | if (*e != '\0') | |
281 | *e++ = '\0'; | |
282 | *str = e; | |
283 | ||
284 | return (s); | |
285 | } | |
286 | ||
287 | /* | |
288 | * Get the next non-null token (like GNU strsep). Strsep() will return a | |
289 | * null token for two adjacent separators, so we may have to loop. | |
290 | */ | |
396c147e | 291 | static char * |
f6fdbddf | 292 | strnnsep(char **stringp, char *delim) |
293 | { | |
294 | char *tok; | |
295 | ||
296 | do { | |
297 | tok = xstrsep(stringp, delim); | |
298 | } while (tok && *tok == '\0'); | |
299 | return (tok); | |
300 | } | |
301 | ||
5061072f | 302 | static Key * |
303 | keygrab_ssh1(con *c) | |
f6fdbddf | 304 | { |
305 | static Key *rsa; | |
306 | static Buffer msg; | |
307 | ||
308 | if (rsa == NULL) { | |
309 | buffer_init(&msg); | |
310 | rsa = key_new(KEY_RSA1); | |
311 | } | |
5061072f | 312 | buffer_append(&msg, c->c_data, c->c_plen); |
313 | buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */ | |
f6fdbddf | 314 | if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) { |
5061072f | 315 | error("%s: invalid packet type", c->c_name); |
f6fdbddf | 316 | buffer_clear(&msg); |
5061072f | 317 | return NULL; |
f6fdbddf | 318 | } |
319 | buffer_consume(&msg, 8); /* cookie */ | |
320 | ||
321 | /* server key */ | |
322 | (void) buffer_get_int(&msg); | |
323 | buffer_get_bignum(&msg, rsa->rsa->e); | |
324 | buffer_get_bignum(&msg, rsa->rsa->n); | |
325 | ||
326 | /* host key */ | |
327 | (void) buffer_get_int(&msg); | |
328 | buffer_get_bignum(&msg, rsa->rsa->e); | |
329 | buffer_get_bignum(&msg, rsa->rsa->n); | |
5061072f | 330 | |
f6fdbddf | 331 | buffer_clear(&msg); |
332 | ||
5061072f | 333 | return (rsa); |
334 | } | |
335 | ||
336 | static int | |
337 | hostjump(Key *hostkey) | |
338 | { | |
4278ff63 | 339 | kexjmp_key = hostkey; |
340 | longjmp(kexjmp, 1); | |
5061072f | 341 | } |
342 | ||
343 | static int | |
344 | ssh2_capable(int remote_major, int remote_minor) | |
345 | { | |
346 | switch (remote_major) { | |
347 | case 1: | |
348 | if (remote_minor == 99) | |
349 | return 1; | |
350 | break; | |
351 | case 2: | |
352 | return 1; | |
353 | default: | |
354 | break; | |
355 | } | |
356 | return 0; | |
357 | } | |
358 | ||
359 | static Key * | |
360 | keygrab_ssh2(con *c) | |
361 | { | |
362 | int j; | |
363 | ||
364 | packet_set_connection(c->c_fd, c->c_fd); | |
365 | enable_compat20(); | |
366 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA? | |
367 | "ssh-dss": "ssh-rsa"; | |
368 | c->c_kex = kex_setup(myproposal); | |
98a58eda | 369 | c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
41e5bd9a | 370 | c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; |
98a58eda | 371 | c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; |
2ff8003a | 372 | c->c_kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; |
5061072f | 373 | c->c_kex->verify_host_key = hostjump; |
374 | ||
375 | if (!(j = setjmp(kexjmp))) { | |
376 | nonfatal_fatal = 1; | |
377 | dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex); | |
378 | fprintf(stderr, "Impossible! dispatch_run() returned!\n"); | |
379 | exit(1); | |
380 | } | |
381 | nonfatal_fatal = 0; | |
382 | xfree(c->c_kex); | |
383 | c->c_kex = NULL; | |
384 | packet_close(); | |
5061072f | 385 | |
4278ff63 | 386 | return j < 0? NULL : kexjmp_key; |
5061072f | 387 | } |
388 | ||
389 | static void | |
390 | keyprint(con *c, Key *key) | |
391 | { | |
90a8ae9f | 392 | char *host = c->c_output_name ? c->c_output_name : c->c_name; |
393 | ||
5061072f | 394 | if (!key) |
395 | return; | |
90a8ae9f | 396 | if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL) |
397 | fatal("host_hash failed"); | |
5061072f | 398 | |
90a8ae9f | 399 | fprintf(stdout, "%s ", host); |
5061072f | 400 | key_write(key, stdout); |
f6fdbddf | 401 | fputs("\n", stdout); |
402 | } | |
403 | ||
396c147e | 404 | static int |
f6fdbddf | 405 | tcpconnect(char *host) |
406 | { | |
407 | struct addrinfo hints, *ai, *aitop; | |
408 | char strport[NI_MAXSERV]; | |
409 | int gaierr, s = -1; | |
410 | ||
5061072f | 411 | snprintf(strport, sizeof strport, "%d", ssh_port); |
f6fdbddf | 412 | memset(&hints, 0, sizeof(hints)); |
5061072f | 413 | hints.ai_family = IPv4or6; |
f6fdbddf | 414 | hints.ai_socktype = SOCK_STREAM; |
415 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) | |
bb4626fe | 416 | fatal("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr)); |
f6fdbddf | 417 | for (ai = aitop; ai; ai = ai->ai_next) { |
fe7dba42 | 418 | s = socket_rdomain(ai->ai_family, ai->ai_socktype, |
419 | ai->ai_protocol, scan_rdomain); | |
f6fdbddf | 420 | if (s < 0) { |
421 | error("socket: %s", strerror(errno)); | |
422 | continue; | |
423 | } | |
170694d7 | 424 | if (set_nonblock(s) == -1) |
425 | fatal("%s: set_nonblock(%d)", __func__, s); | |
f6fdbddf | 426 | if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 && |
427 | errno != EINPROGRESS) | |
428 | error("connect (`%s'): %s", host, strerror(errno)); | |
429 | else | |
430 | break; | |
431 | close(s); | |
432 | s = -1; | |
433 | } | |
434 | freeaddrinfo(aitop); | |
435 | return s; | |
436 | } | |
437 | ||
396c147e | 438 | static int |
5061072f | 439 | conalloc(char *iname, char *oname, int keytype) |
f6fdbddf | 440 | { |
f6fdbddf | 441 | char *namebase, *name, *namelist; |
50d2fbbc | 442 | int s; |
f6fdbddf | 443 | |
444 | namebase = namelist = xstrdup(iname); | |
445 | ||
446 | do { | |
447 | name = xstrsep(&namelist, ","); | |
448 | if (!name) { | |
b5c334cc | 449 | xfree(namebase); |
f6fdbddf | 450 | return (-1); |
451 | } | |
452 | } while ((s = tcpconnect(name)) < 0); | |
453 | ||
454 | if (s >= maxfd) | |
227e8e86 | 455 | fatal("conalloc: fdno %d too high", s); |
f6fdbddf | 456 | if (fdcon[s].c_status) |
227e8e86 | 457 | fatal("conalloc: attempt to reuse fdno %d", s); |
f6fdbddf | 458 | |
459 | fdcon[s].c_fd = s; | |
460 | fdcon[s].c_status = CS_CON; | |
461 | fdcon[s].c_namebase = namebase; | |
462 | fdcon[s].c_name = name; | |
463 | fdcon[s].c_namelist = namelist; | |
464 | fdcon[s].c_output_name = xstrdup(oname); | |
465 | fdcon[s].c_data = (char *) &fdcon[s].c_plen; | |
466 | fdcon[s].c_len = 4; | |
467 | fdcon[s].c_off = 0; | |
5061072f | 468 | fdcon[s].c_keytype = keytype; |
f6fdbddf | 469 | gettimeofday(&fdcon[s].c_tv, NULL); |
470 | fdcon[s].c_tv.tv_sec += timeout; | |
471 | TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); | |
ff7fee59 | 472 | FD_SET(s, read_wait); |
f6fdbddf | 473 | ncon++; |
474 | return (s); | |
475 | } | |
476 | ||
396c147e | 477 | static void |
f6fdbddf | 478 | confree(int s) |
479 | { | |
f6fdbddf | 480 | if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) |
227e8e86 | 481 | fatal("confree: attempt to free bad fdno %d", s); |
2671b47f | 482 | close(s); |
b5c334cc | 483 | xfree(fdcon[s].c_namebase); |
484 | xfree(fdcon[s].c_output_name); | |
f6fdbddf | 485 | if (fdcon[s].c_status == CS_KEYS) |
b5c334cc | 486 | xfree(fdcon[s].c_data); |
f6fdbddf | 487 | fdcon[s].c_status = CS_UNUSED; |
5061072f | 488 | fdcon[s].c_keytype = 0; |
f6fdbddf | 489 | TAILQ_REMOVE(&tq, &fdcon[s], c_link); |
ff7fee59 | 490 | FD_CLR(s, read_wait); |
f6fdbddf | 491 | ncon--; |
492 | } | |
493 | ||
396c147e | 494 | static void |
f6fdbddf | 495 | contouch(int s) |
496 | { | |
497 | TAILQ_REMOVE(&tq, &fdcon[s], c_link); | |
498 | gettimeofday(&fdcon[s].c_tv, NULL); | |
499 | fdcon[s].c_tv.tv_sec += timeout; | |
500 | TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); | |
501 | } | |
502 | ||
396c147e | 503 | static int |
f6fdbddf | 504 | conrecycle(int s) |
505 | { | |
f6fdbddf | 506 | con *c = &fdcon[s]; |
50d2fbbc | 507 | int ret; |
f6fdbddf | 508 | |
5061072f | 509 | ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); |
f6fdbddf | 510 | confree(s); |
f6fdbddf | 511 | return (ret); |
512 | } | |
513 | ||
396c147e | 514 | static void |
f6fdbddf | 515 | congreet(int s) |
516 | { | |
2ceb8101 | 517 | int n = 0, remote_major = 0, remote_minor = 0; |
5061072f | 518 | char buf[256], *cp; |
cdc95d6e | 519 | char remote_version[sizeof buf]; |
2ceb8101 | 520 | size_t bufsiz; |
f6fdbddf | 521 | con *c = &fdcon[s]; |
522 | ||
2995db03 | 523 | for (;;) { |
524 | memset(buf, '\0', sizeof(buf)); | |
525 | bufsiz = sizeof(buf); | |
526 | cp = buf; | |
527 | while (bufsiz-- && | |
528 | (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') { | |
529 | if (*cp == '\r') | |
530 | *cp = '\n'; | |
531 | cp++; | |
532 | } | |
533 | if (n != 1 || strncmp(buf, "SSH-", 4) == 0) | |
534 | break; | |
578954b1 | 535 | } |
27452401 | 536 | if (n == 0) { |
05624c18 | 537 | switch (errno) { |
538 | case EPIPE: | |
539 | error("%s: Connection closed by remote host", c->c_name); | |
540 | break; | |
541 | case ECONNREFUSED: | |
542 | break; | |
543 | default: | |
544 | error("read (%s): %s", c->c_name, strerror(errno)); | |
545 | break; | |
546 | } | |
27452401 | 547 | conrecycle(s); |
548 | return; | |
549 | } | |
c16c7f20 | 550 | if (*cp != '\n' && *cp != '\r') { |
f6fdbddf | 551 | error("%s: bad greeting", c->c_name); |
552 | confree(s); | |
553 | return; | |
554 | } | |
c16c7f20 | 555 | *cp = '\0'; |
cdc95d6e | 556 | if (sscanf(buf, "SSH-%d.%d-%[^\n]\n", |
557 | &remote_major, &remote_minor, remote_version) == 3) | |
558 | compat_datafellows(remote_version); | |
559 | else | |
560 | datafellows = 0; | |
5061072f | 561 | if (c->c_keytype != KT_RSA1) { |
5061072f | 562 | if (!ssh2_capable(remote_major, remote_minor)) { |
563 | debug("%s doesn't support ssh2", c->c_name); | |
564 | confree(s); | |
565 | return; | |
566 | } | |
cdc95d6e | 567 | } else if (remote_major != 1) { |
568 | debug("%s doesn't support ssh1", c->c_name); | |
569 | confree(s); | |
570 | return; | |
5061072f | 571 | } |
578954b1 | 572 | fprintf(stderr, "# %s %s\n", c->c_name, chop(buf)); |
5061072f | 573 | n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", |
574 | c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2, | |
575 | c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2); | |
2ceb8101 | 576 | if (n < 0 || (size_t)n >= sizeof(buf)) { |
4b826d75 | 577 | error("snprintf: buffer too small"); |
578 | confree(s); | |
579 | return; | |
580 | } | |
2ceb8101 | 581 | if (atomicio(vwrite, s, buf, n) != (size_t)n) { |
f6fdbddf | 582 | error("write (%s): %s", c->c_name, strerror(errno)); |
583 | confree(s); | |
584 | return; | |
585 | } | |
5061072f | 586 | if (c->c_keytype != KT_RSA1) { |
587 | keyprint(c, keygrab_ssh2(c)); | |
588 | confree(s); | |
589 | return; | |
590 | } | |
f6fdbddf | 591 | c->c_status = CS_SIZE; |
592 | contouch(s); | |
593 | } | |
594 | ||
396c147e | 595 | static void |
f6fdbddf | 596 | conread(int s) |
597 | { | |
f6fdbddf | 598 | con *c = &fdcon[s]; |
05624c18 | 599 | size_t n; |
f6fdbddf | 600 | |
601 | if (c->c_status == CS_CON) { | |
602 | congreet(s); | |
603 | return; | |
604 | } | |
f581b6e8 | 605 | n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off); |
05624c18 | 606 | if (n == 0) { |
f6fdbddf | 607 | error("read (%s): %s", c->c_name, strerror(errno)); |
608 | confree(s); | |
609 | return; | |
610 | } | |
611 | c->c_off += n; | |
612 | ||
613 | if (c->c_off == c->c_len) | |
614 | switch (c->c_status) { | |
615 | case CS_SIZE: | |
616 | c->c_plen = htonl(c->c_plen); | |
617 | c->c_len = c->c_plen + 8 - (c->c_plen & 7); | |
618 | c->c_off = 0; | |
619 | c->c_data = xmalloc(c->c_len); | |
620 | c->c_status = CS_KEYS; | |
621 | break; | |
622 | case CS_KEYS: | |
5061072f | 623 | keyprint(c, keygrab_ssh1(c)); |
f6fdbddf | 624 | confree(s); |
625 | return; | |
f6fdbddf | 626 | default: |
227e8e86 | 627 | fatal("conread: invalid status %d", c->c_status); |
f6fdbddf | 628 | break; |
629 | } | |
630 | ||
631 | contouch(s); | |
632 | } | |
633 | ||
396c147e | 634 | static void |
f6fdbddf | 635 | conloop(void) |
636 | { | |
f6fdbddf | 637 | struct timeval seltime, now; |
50d2fbbc | 638 | fd_set *r, *e; |
f6fdbddf | 639 | con *c; |
50d2fbbc | 640 | int i; |
f6fdbddf | 641 | |
642 | gettimeofday(&now, NULL); | |
48ba8dc8 | 643 | c = TAILQ_FIRST(&tq); |
f6fdbddf | 644 | |
2671b47f | 645 | if (c && (c->c_tv.tv_sec > now.tv_sec || |
646 | (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) { | |
f6fdbddf | 647 | seltime = c->c_tv; |
648 | seltime.tv_sec -= now.tv_sec; | |
649 | seltime.tv_usec -= now.tv_usec; | |
5be2ec5e | 650 | if (seltime.tv_usec < 0) { |
f6fdbddf | 651 | seltime.tv_usec += 1000000; |
652 | seltime.tv_sec--; | |
653 | } | |
654 | } else | |
655 | seltime.tv_sec = seltime.tv_usec = 0; | |
656 | ||
52e3daed | 657 | r = xcalloc(read_wait_nfdset, sizeof(fd_mask)); |
658 | e = xcalloc(read_wait_nfdset, sizeof(fd_mask)); | |
659 | memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask)); | |
660 | memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask)); | |
ff7fee59 | 661 | |
662 | while (select(maxfd, r, NULL, e, &seltime) == -1 && | |
5a0c8771 | 663 | (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) |
fd193ca4 | 664 | ; |
665 | ||
2671b47f | 666 | for (i = 0; i < maxfd; i++) { |
ff7fee59 | 667 | if (FD_ISSET(i, e)) { |
f6fdbddf | 668 | error("%s: exception!", fdcon[i].c_name); |
669 | confree(i); | |
ff7fee59 | 670 | } else if (FD_ISSET(i, r)) |
f6fdbddf | 671 | conread(i); |
2671b47f | 672 | } |
ff7fee59 | 673 | xfree(r); |
674 | xfree(e); | |
f6fdbddf | 675 | |
48ba8dc8 | 676 | c = TAILQ_FIRST(&tq); |
2671b47f | 677 | while (c && (c->c_tv.tv_sec < now.tv_sec || |
678 | (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) { | |
f6fdbddf | 679 | int s = c->c_fd; |
2671b47f | 680 | |
48ba8dc8 | 681 | c = TAILQ_NEXT(c, c_link); |
f6fdbddf | 682 | conrecycle(s); |
683 | } | |
684 | } | |
685 | ||
5061072f | 686 | static void |
687 | do_host(char *host) | |
f6fdbddf | 688 | { |
5061072f | 689 | char *name = strnnsep(&host, " \t\n"); |
690 | int j; | |
691 | ||
0408c978 | 692 | if (name == NULL) |
693 | return; | |
5061072f | 694 | for (j = KT_RSA1; j <= KT_RSA; j *= 2) { |
695 | if (get_keytypes & j) { | |
696 | while (ncon >= MAXCON) | |
697 | conloop(); | |
698 | conalloc(name, *host ? host : name, j); | |
f6fdbddf | 699 | } |
700 | } | |
701 | } | |
702 | ||
2bae80e9 | 703 | void |
704 | fatal(const char *fmt,...) | |
5061072f | 705 | { |
2bae80e9 | 706 | va_list args; |
50d2fbbc | 707 | |
2bae80e9 | 708 | va_start(args, fmt); |
709 | do_log(SYSLOG_LEVEL_FATAL, fmt, args); | |
710 | va_end(args); | |
5061072f | 711 | if (nonfatal_fatal) |
712 | longjmp(kexjmp, -1); | |
2bae80e9 | 713 | else |
eec6d341 | 714 | exit(255); |
5061072f | 715 | } |
716 | ||
396c147e | 717 | static void |
f6fdbddf | 718 | usage(void) |
719 | { | |
9995aaa3 | 720 | fprintf(stderr, |
721 | "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n" | |
fe7dba42 | 722 | "\t\t [-V rdomain] [host | addrlist namelist] ...\n", |
33e766d2 | 723 | __progname); |
33e766d2 | 724 | exit(1); |
f6fdbddf | 725 | } |
726 | ||
727 | int | |
728 | main(int argc, char **argv) | |
729 | { | |
5061072f | 730 | int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; |
731 | int opt, fopt_count = 0; | |
732 | char *tname; | |
a204806b | 733 | |
5061072f | 734 | extern int optind; |
735 | extern char *optarg; | |
f6fdbddf | 736 | |
fda04d7d | 737 | __progname = ssh_get_progname(argv[0]); |
8782141f | 738 | init_rng(); |
739 | seed_rng(); | |
f6fdbddf | 740 | TAILQ_INIT(&tq); |
741 | ||
fd6168c1 | 742 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
743 | sanitise_stdfd(); | |
744 | ||
5061072f | 745 | if (argc <= 1) |
f6fdbddf | 746 | usage(); |
747 | ||
fe7dba42 | 748 | while ((opt = getopt(argc, argv, "Hv46p:T:t:f:V:")) != -1) { |
5061072f | 749 | switch (opt) { |
90a8ae9f | 750 | case 'H': |
751 | hash_hosts = 1; | |
752 | break; | |
5061072f | 753 | case 'p': |
754 | ssh_port = a2port(optarg); | |
5134115d | 755 | if (ssh_port <= 0) { |
5061072f | 756 | fprintf(stderr, "Bad port '%s'\n", optarg); |
757 | exit(1); | |
758 | } | |
759 | break; | |
760 | case 'T': | |
c8f94200 | 761 | timeout = convtime(optarg); |
762 | if (timeout == -1 || timeout == 0) { | |
763 | fprintf(stderr, "Bad timeout '%s'\n", optarg); | |
f6fdbddf | 764 | usage(); |
c8f94200 | 765 | } |
5061072f | 766 | break; |
767 | case 'v': | |
768 | if (!debug_flag) { | |
769 | debug_flag = 1; | |
770 | log_level = SYSLOG_LEVEL_DEBUG1; | |
771 | } | |
772 | else if (log_level < SYSLOG_LEVEL_DEBUG3) | |
773 | log_level++; | |
774 | else | |
775 | fatal("Too high debugging level."); | |
776 | break; | |
a204806b | 777 | case 'f': |
5061072f | 778 | if (strcmp(optarg, "-") == 0) |
779 | optarg = NULL; | |
780 | argv[fopt_count++] = optarg; | |
781 | break; | |
782 | case 't': | |
783 | get_keytypes = 0; | |
784 | tname = strtok(optarg, ","); | |
785 | while (tname) { | |
786 | int type = key_type_from_name(tname); | |
787 | switch (type) { | |
788 | case KEY_RSA1: | |
789 | get_keytypes |= KT_RSA1; | |
790 | break; | |
791 | case KEY_DSA: | |
792 | get_keytypes |= KT_DSA; | |
793 | break; | |
794 | case KEY_RSA: | |
795 | get_keytypes |= KT_RSA; | |
796 | break; | |
797 | case KEY_UNSPEC: | |
f48e63c8 | 798 | fatal("unknown key type %s", tname); |
5061072f | 799 | } |
800 | tname = strtok(NULL, ","); | |
801 | } | |
802 | break; | |
803 | case '4': | |
804 | IPv4or6 = AF_INET; | |
805 | break; | |
806 | case '6': | |
807 | IPv4or6 = AF_INET6; | |
808 | break; | |
fe7dba42 | 809 | case 'V': |
810 | scan_rdomain = a2port(optarg); | |
811 | if (scan_rdomain < 0) | |
812 | scan_rdomain = -1; | |
813 | break; | |
5061072f | 814 | case '?': |
815 | default: | |
f6fdbddf | 816 | usage(); |
5061072f | 817 | } |
f6fdbddf | 818 | } |
5061072f | 819 | if (optind == argc && !fopt_count) |
f6fdbddf | 820 | usage(); |
821 | ||
5061072f | 822 | log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); |
5061072f | 823 | |
f6fdbddf | 824 | maxfd = fdlim_get(1); |
825 | if (maxfd < 0) | |
227e8e86 | 826 | fatal("%s: fdlim_get: bad value", __progname); |
f6fdbddf | 827 | if (maxfd > MAXMAXFD) |
828 | maxfd = MAXMAXFD; | |
2671b47f | 829 | if (MAXCON <= 0) |
227e8e86 | 830 | fatal("%s: not enough file descriptors", __progname); |
f6fdbddf | 831 | if (maxfd > fdlim_get(0)) |
832 | fdlim_set(maxfd); | |
52e3daed | 833 | fdcon = xcalloc(maxfd, sizeof(con)); |
f6fdbddf | 834 | |
52e3daed | 835 | read_wait_nfdset = howmany(maxfd, NFDBITS); |
836 | read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask)); | |
ff7fee59 | 837 | |
5061072f | 838 | if (fopt_count) { |
839 | Linebuf *lb; | |
840 | char *line; | |
841 | int j; | |
842 | ||
843 | for (j = 0; j < fopt_count; j++) { | |
844 | lb = Linebuf_alloc(argv[j], error); | |
b7f79e7a | 845 | if (!lb) |
846 | continue; | |
5061072f | 847 | while ((line = Linebuf_getline(lb)) != NULL) |
848 | do_host(line); | |
849 | Linebuf_free(lb); | |
f6fdbddf | 850 | } |
5061072f | 851 | } |
852 | ||
853 | while (optind < argc) | |
854 | do_host(argv[optind++]); | |
855 | ||
f6fdbddf | 856 | while (ncon > 0) |
857 | conloop(); | |
858 | ||
859 | return (0); | |
860 | } |