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Commit | Line | Data |
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f6fdbddf | 1 | /* |
2 | * Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>. | |
3 | * | |
4 | * Modification and redistribution in source and binary forms is | |
5 | * permitted provided that due credit is given to the author and the | |
aa144206 | 6 | * OpenBSD project by leaving this copyright notice intact. |
f6fdbddf | 7 | */ |
8 | ||
9 | #include "includes.h" | |
fd6168c1 | 10 | RCSID("$OpenBSD: ssh-keyscan.c,v 1.56 2005/09/13 23:40:07 djm Exp $"); |
f6fdbddf | 11 | |
9fd2a215 | 12 | #include "openbsd-compat/sys-queue.h" |
f6fdbddf | 13 | |
14 | #include <openssl/bn.h> | |
f6fdbddf | 15 | |
5061072f | 16 | #include <setjmp.h> |
f6fdbddf | 17 | #include "xmalloc.h" |
18 | #include "ssh.h" | |
42f11eb2 | 19 | #include "ssh1.h" |
f6fdbddf | 20 | #include "key.h" |
5061072f | 21 | #include "kex.h" |
22 | #include "compat.h" | |
23 | #include "myproposal.h" | |
24 | #include "packet.h" | |
25 | #include "dispatch.h" | |
f6fdbddf | 26 | #include "buffer.h" |
27 | #include "bufaux.h" | |
42f11eb2 | 28 | #include "log.h" |
2671b47f | 29 | #include "atomicio.h" |
5061072f | 30 | #include "misc.h" |
90a8ae9f | 31 | #include "hostfile.h" |
f6fdbddf | 32 | |
5061072f | 33 | /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. |
34 | Default value is AF_UNSPEC means both IPv4 and IPv6. */ | |
5061072f | 35 | int IPv4or6 = AF_UNSPEC; |
f6fdbddf | 36 | |
5061072f | 37 | int ssh_port = SSH_DEFAULT_PORT; |
a204806b | 38 | |
39 | #define KT_RSA1 1 | |
40 | #define KT_DSA 2 | |
41 | #define KT_RSA 4 | |
42 | ||
43 | int get_keytypes = KT_RSA1; /* Get only RSA1 keys by default */ | |
f6fdbddf | 44 | |
90a8ae9f | 45 | int hash_hosts = 0; /* Hash hostname on output */ |
46 | ||
f6fdbddf | 47 | #define MAXMAXFD 256 |
48 | ||
49 | /* The number of seconds after which to give up on a TCP connection */ | |
50 | int timeout = 5; | |
51 | ||
52 | int maxfd; | |
2671b47f | 53 | #define MAXCON (maxfd - 10) |
f6fdbddf | 54 | |
1fe6a48f | 55 | extern char *__progname; |
ff7fee59 | 56 | fd_set *read_wait; |
57 | size_t read_wait_size; | |
f6fdbddf | 58 | int ncon; |
5061072f | 59 | int nonfatal_fatal = 0; |
60 | jmp_buf kexjmp; | |
4278ff63 | 61 | Key *kexjmp_key; |
f6fdbddf | 62 | |
63 | /* | |
64 | * Keep a connection structure for each file descriptor. The state | |
65 | * associated with file descriptor n is held in fdcon[n]. | |
66 | */ | |
67 | typedef struct Connection { | |
1e3b8b07 | 68 | u_char c_status; /* State of connection on this file desc. */ |
f6fdbddf | 69 | #define CS_UNUSED 0 /* File descriptor unused */ |
70 | #define CS_CON 1 /* Waiting to connect/read greeting */ | |
71 | #define CS_SIZE 2 /* Waiting to read initial packet size */ | |
72 | #define CS_KEYS 3 /* Waiting to read public key packet */ | |
73 | int c_fd; /* Quick lookup: c->c_fd == c - fdcon */ | |
74 | int c_plen; /* Packet length field for ssh packet */ | |
75 | int c_len; /* Total bytes which must be read. */ | |
76 | int c_off; /* Length of data read so far. */ | |
5061072f | 77 | int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */ |
f6fdbddf | 78 | char *c_namebase; /* Address to free for c_name and c_namelist */ |
79 | char *c_name; /* Hostname of connection for errors */ | |
80 | char *c_namelist; /* Pointer to other possible addresses */ | |
81 | char *c_output_name; /* Hostname of connection for output */ | |
82 | char *c_data; /* Data read from this fd */ | |
5061072f | 83 | Kex *c_kex; /* The key-exchange struct for ssh2 */ |
f6fdbddf | 84 | struct timeval c_tv; /* Time at which connection gets aborted */ |
85 | TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */ | |
86 | } con; | |
87 | ||
88 | TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */ | |
89 | con *fdcon; | |
90 | ||
91 | /* | |
92 | * This is just a wrapper around fgets() to make it usable. | |
93 | */ | |
94 | ||
95 | /* Stress-test. Increase this later. */ | |
96 | #define LINEBUF_SIZE 16 | |
97 | ||
98 | typedef struct { | |
99 | char *buf; | |
1e3b8b07 | 100 | u_int size; |
f6fdbddf | 101 | int lineno; |
102 | const char *filename; | |
103 | FILE *stream; | |
104 | void (*errfun) (const char *,...); | |
105 | } Linebuf; | |
106 | ||
396c147e | 107 | static Linebuf * |
f6fdbddf | 108 | Linebuf_alloc(const char *filename, void (*errfun) (const char *,...)) |
109 | { | |
110 | Linebuf *lb; | |
111 | ||
112 | if (!(lb = malloc(sizeof(*lb)))) { | |
113 | if (errfun) | |
f11fe301 | 114 | (*errfun) ("linebuf (%s): malloc failed\n", |
115 | filename ? filename : "(stdin)"); | |
f6fdbddf | 116 | return (NULL); |
117 | } | |
118 | if (filename) { | |
119 | lb->filename = filename; | |
120 | if (!(lb->stream = fopen(filename, "r"))) { | |
b5c334cc | 121 | xfree(lb); |
f6fdbddf | 122 | if (errfun) |
123 | (*errfun) ("%s: %s\n", filename, strerror(errno)); | |
124 | return (NULL); | |
125 | } | |
126 | } else { | |
127 | lb->filename = "(stdin)"; | |
128 | lb->stream = stdin; | |
129 | } | |
130 | ||
131 | if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) { | |
132 | if (errfun) | |
133 | (*errfun) ("linebuf (%s): malloc failed\n", lb->filename); | |
b5c334cc | 134 | xfree(lb); |
f6fdbddf | 135 | return (NULL); |
136 | } | |
137 | lb->errfun = errfun; | |
138 | lb->lineno = 0; | |
139 | return (lb); | |
140 | } | |
141 | ||
396c147e | 142 | static void |
f6fdbddf | 143 | Linebuf_free(Linebuf * lb) |
144 | { | |
145 | fclose(lb->stream); | |
b5c334cc | 146 | xfree(lb->buf); |
147 | xfree(lb); | |
f6fdbddf | 148 | } |
149 | ||
396c147e | 150 | #if 0 |
151 | static void | |
f6fdbddf | 152 | Linebuf_restart(Linebuf * lb) |
153 | { | |
154 | clearerr(lb->stream); | |
155 | rewind(lb->stream); | |
156 | lb->lineno = 0; | |
157 | } | |
158 | ||
396c147e | 159 | static int |
f6fdbddf | 160 | Linebuf_lineno(Linebuf * lb) |
161 | { | |
162 | return (lb->lineno); | |
163 | } | |
396c147e | 164 | #endif |
f6fdbddf | 165 | |
396c147e | 166 | static char * |
5be2ec5e | 167 | Linebuf_getline(Linebuf * lb) |
f6fdbddf | 168 | { |
2ceb8101 | 169 | size_t n = 0; |
50d2fbbc | 170 | void *p; |
f6fdbddf | 171 | |
172 | lb->lineno++; | |
173 | for (;;) { | |
174 | /* Read a line */ | |
175 | if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) { | |
176 | if (ferror(lb->stream) && lb->errfun) | |
50d2fbbc | 177 | (*lb->errfun)("%s: %s\n", lb->filename, |
778f6940 | 178 | strerror(errno)); |
f6fdbddf | 179 | return (NULL); |
180 | } | |
181 | n = strlen(lb->buf); | |
182 | ||
183 | /* Return it or an error if it fits */ | |
184 | if (n > 0 && lb->buf[n - 1] == '\n') { | |
185 | lb->buf[n - 1] = '\0'; | |
186 | return (lb->buf); | |
187 | } | |
188 | if (n != lb->size - 1) { | |
189 | if (lb->errfun) | |
50d2fbbc | 190 | (*lb->errfun)("%s: skipping incomplete last line\n", |
778f6940 | 191 | lb->filename); |
f6fdbddf | 192 | return (NULL); |
193 | } | |
194 | /* Double the buffer if we need more space */ | |
50d2fbbc | 195 | lb->size *= 2; |
196 | if ((p = realloc(lb->buf, lb->size)) == NULL) { | |
197 | lb->size /= 2; | |
f6fdbddf | 198 | if (lb->errfun) |
50d2fbbc | 199 | (*lb->errfun)("linebuf (%s): realloc failed\n", |
778f6940 | 200 | lb->filename); |
f6fdbddf | 201 | return (NULL); |
202 | } | |
50d2fbbc | 203 | lb->buf = p; |
f6fdbddf | 204 | } |
205 | } | |
206 | ||
396c147e | 207 | static int |
f6fdbddf | 208 | fdlim_get(int hard) |
209 | { | |
f318b98b | 210 | #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE) |
f6fdbddf | 211 | struct rlimit rlfd; |
778f6940 | 212 | |
f6fdbddf | 213 | if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) |
214 | return (-1); | |
215 | if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY) | |
341c3efe | 216 | return SSH_SYSFDMAX; |
f6fdbddf | 217 | else |
218 | return hard ? rlfd.rlim_max : rlfd.rlim_cur; | |
b03bd394 | 219 | #else |
341c3efe | 220 | return SSH_SYSFDMAX; |
b03bd394 | 221 | #endif |
f6fdbddf | 222 | } |
223 | ||
396c147e | 224 | static int |
f6fdbddf | 225 | fdlim_set(int lim) |
226 | { | |
f318b98b | 227 | #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) |
f6fdbddf | 228 | struct rlimit rlfd; |
b03bd394 | 229 | #endif |
41545cb6 | 230 | |
f6fdbddf | 231 | if (lim <= 0) |
232 | return (-1); | |
f318b98b | 233 | #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) |
f6fdbddf | 234 | if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) |
235 | return (-1); | |
236 | rlfd.rlim_cur = lim; | |
237 | if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0) | |
238 | return (-1); | |
b03bd394 | 239 | #elif defined (HAVE_SETDTABLESIZE) |
b705bea0 | 240 | setdtablesize(lim); |
b03bd394 | 241 | #endif |
f6fdbddf | 242 | return (0); |
243 | } | |
244 | ||
245 | /* | |
246 | * This is an strsep function that returns a null field for adjacent | |
247 | * separators. This is the same as the 4.4BSD strsep, but different from the | |
248 | * one in the GNU libc. | |
249 | */ | |
396c147e | 250 | static char * |
f6fdbddf | 251 | xstrsep(char **str, const char *delim) |
252 | { | |
253 | char *s, *e; | |
254 | ||
255 | if (!**str) | |
256 | return (NULL); | |
257 | ||
258 | s = *str; | |
259 | e = s + strcspn(s, delim); | |
260 | ||
261 | if (*e != '\0') | |
262 | *e++ = '\0'; | |
263 | *str = e; | |
264 | ||
265 | return (s); | |
266 | } | |
267 | ||
268 | /* | |
269 | * Get the next non-null token (like GNU strsep). Strsep() will return a | |
270 | * null token for two adjacent separators, so we may have to loop. | |
271 | */ | |
396c147e | 272 | static char * |
f6fdbddf | 273 | strnnsep(char **stringp, char *delim) |
274 | { | |
275 | char *tok; | |
276 | ||
277 | do { | |
278 | tok = xstrsep(stringp, delim); | |
279 | } while (tok && *tok == '\0'); | |
280 | return (tok); | |
281 | } | |
282 | ||
5061072f | 283 | static Key * |
284 | keygrab_ssh1(con *c) | |
f6fdbddf | 285 | { |
286 | static Key *rsa; | |
287 | static Buffer msg; | |
288 | ||
289 | if (rsa == NULL) { | |
290 | buffer_init(&msg); | |
291 | rsa = key_new(KEY_RSA1); | |
292 | } | |
5061072f | 293 | buffer_append(&msg, c->c_data, c->c_plen); |
294 | buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */ | |
f6fdbddf | 295 | if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) { |
5061072f | 296 | error("%s: invalid packet type", c->c_name); |
f6fdbddf | 297 | buffer_clear(&msg); |
5061072f | 298 | return NULL; |
f6fdbddf | 299 | } |
300 | buffer_consume(&msg, 8); /* cookie */ | |
301 | ||
302 | /* server key */ | |
303 | (void) buffer_get_int(&msg); | |
304 | buffer_get_bignum(&msg, rsa->rsa->e); | |
305 | buffer_get_bignum(&msg, rsa->rsa->n); | |
306 | ||
307 | /* host key */ | |
308 | (void) buffer_get_int(&msg); | |
309 | buffer_get_bignum(&msg, rsa->rsa->e); | |
310 | buffer_get_bignum(&msg, rsa->rsa->n); | |
5061072f | 311 | |
f6fdbddf | 312 | buffer_clear(&msg); |
313 | ||
5061072f | 314 | return (rsa); |
315 | } | |
316 | ||
317 | static int | |
318 | hostjump(Key *hostkey) | |
319 | { | |
4278ff63 | 320 | kexjmp_key = hostkey; |
321 | longjmp(kexjmp, 1); | |
5061072f | 322 | } |
323 | ||
324 | static int | |
325 | ssh2_capable(int remote_major, int remote_minor) | |
326 | { | |
327 | switch (remote_major) { | |
328 | case 1: | |
329 | if (remote_minor == 99) | |
330 | return 1; | |
331 | break; | |
332 | case 2: | |
333 | return 1; | |
334 | default: | |
335 | break; | |
336 | } | |
337 | return 0; | |
338 | } | |
339 | ||
340 | static Key * | |
341 | keygrab_ssh2(con *c) | |
342 | { | |
343 | int j; | |
344 | ||
345 | packet_set_connection(c->c_fd, c->c_fd); | |
346 | enable_compat20(); | |
347 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA? | |
348 | "ssh-dss": "ssh-rsa"; | |
349 | c->c_kex = kex_setup(myproposal); | |
98a58eda | 350 | c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
41e5bd9a | 351 | c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; |
98a58eda | 352 | c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; |
5061072f | 353 | c->c_kex->verify_host_key = hostjump; |
354 | ||
355 | if (!(j = setjmp(kexjmp))) { | |
356 | nonfatal_fatal = 1; | |
357 | dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex); | |
358 | fprintf(stderr, "Impossible! dispatch_run() returned!\n"); | |
359 | exit(1); | |
360 | } | |
361 | nonfatal_fatal = 0; | |
362 | xfree(c->c_kex); | |
363 | c->c_kex = NULL; | |
364 | packet_close(); | |
5061072f | 365 | |
4278ff63 | 366 | return j < 0? NULL : kexjmp_key; |
5061072f | 367 | } |
368 | ||
369 | static void | |
370 | keyprint(con *c, Key *key) | |
371 | { | |
90a8ae9f | 372 | char *host = c->c_output_name ? c->c_output_name : c->c_name; |
373 | ||
5061072f | 374 | if (!key) |
375 | return; | |
90a8ae9f | 376 | if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL) |
377 | fatal("host_hash failed"); | |
5061072f | 378 | |
90a8ae9f | 379 | fprintf(stdout, "%s ", host); |
5061072f | 380 | key_write(key, stdout); |
f6fdbddf | 381 | fputs("\n", stdout); |
382 | } | |
383 | ||
396c147e | 384 | static int |
f6fdbddf | 385 | tcpconnect(char *host) |
386 | { | |
387 | struct addrinfo hints, *ai, *aitop; | |
388 | char strport[NI_MAXSERV]; | |
389 | int gaierr, s = -1; | |
390 | ||
5061072f | 391 | snprintf(strport, sizeof strport, "%d", ssh_port); |
f6fdbddf | 392 | memset(&hints, 0, sizeof(hints)); |
5061072f | 393 | hints.ai_family = IPv4or6; |
f6fdbddf | 394 | hints.ai_socktype = SOCK_STREAM; |
395 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) | |
396 | fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr)); | |
397 | for (ai = aitop; ai; ai = ai->ai_next) { | |
3e131a6d | 398 | s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
f6fdbddf | 399 | if (s < 0) { |
400 | error("socket: %s", strerror(errno)); | |
401 | continue; | |
402 | } | |
170694d7 | 403 | if (set_nonblock(s) == -1) |
404 | fatal("%s: set_nonblock(%d)", __func__, s); | |
f6fdbddf | 405 | if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 && |
406 | errno != EINPROGRESS) | |
407 | error("connect (`%s'): %s", host, strerror(errno)); | |
408 | else | |
409 | break; | |
410 | close(s); | |
411 | s = -1; | |
412 | } | |
413 | freeaddrinfo(aitop); | |
414 | return s; | |
415 | } | |
416 | ||
396c147e | 417 | static int |
5061072f | 418 | conalloc(char *iname, char *oname, int keytype) |
f6fdbddf | 419 | { |
f6fdbddf | 420 | char *namebase, *name, *namelist; |
50d2fbbc | 421 | int s; |
f6fdbddf | 422 | |
423 | namebase = namelist = xstrdup(iname); | |
424 | ||
425 | do { | |
426 | name = xstrsep(&namelist, ","); | |
427 | if (!name) { | |
b5c334cc | 428 | xfree(namebase); |
f6fdbddf | 429 | return (-1); |
430 | } | |
431 | } while ((s = tcpconnect(name)) < 0); | |
432 | ||
433 | if (s >= maxfd) | |
227e8e86 | 434 | fatal("conalloc: fdno %d too high", s); |
f6fdbddf | 435 | if (fdcon[s].c_status) |
227e8e86 | 436 | fatal("conalloc: attempt to reuse fdno %d", s); |
f6fdbddf | 437 | |
438 | fdcon[s].c_fd = s; | |
439 | fdcon[s].c_status = CS_CON; | |
440 | fdcon[s].c_namebase = namebase; | |
441 | fdcon[s].c_name = name; | |
442 | fdcon[s].c_namelist = namelist; | |
443 | fdcon[s].c_output_name = xstrdup(oname); | |
444 | fdcon[s].c_data = (char *) &fdcon[s].c_plen; | |
445 | fdcon[s].c_len = 4; | |
446 | fdcon[s].c_off = 0; | |
5061072f | 447 | fdcon[s].c_keytype = keytype; |
f6fdbddf | 448 | gettimeofday(&fdcon[s].c_tv, NULL); |
449 | fdcon[s].c_tv.tv_sec += timeout; | |
450 | TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); | |
ff7fee59 | 451 | FD_SET(s, read_wait); |
f6fdbddf | 452 | ncon++; |
453 | return (s); | |
454 | } | |
455 | ||
396c147e | 456 | static void |
f6fdbddf | 457 | confree(int s) |
458 | { | |
f6fdbddf | 459 | if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) |
227e8e86 | 460 | fatal("confree: attempt to free bad fdno %d", s); |
2671b47f | 461 | close(s); |
b5c334cc | 462 | xfree(fdcon[s].c_namebase); |
463 | xfree(fdcon[s].c_output_name); | |
f6fdbddf | 464 | if (fdcon[s].c_status == CS_KEYS) |
b5c334cc | 465 | xfree(fdcon[s].c_data); |
f6fdbddf | 466 | fdcon[s].c_status = CS_UNUSED; |
5061072f | 467 | fdcon[s].c_keytype = 0; |
f6fdbddf | 468 | TAILQ_REMOVE(&tq, &fdcon[s], c_link); |
ff7fee59 | 469 | FD_CLR(s, read_wait); |
f6fdbddf | 470 | ncon--; |
471 | } | |
472 | ||
396c147e | 473 | static void |
f6fdbddf | 474 | contouch(int s) |
475 | { | |
476 | TAILQ_REMOVE(&tq, &fdcon[s], c_link); | |
477 | gettimeofday(&fdcon[s].c_tv, NULL); | |
478 | fdcon[s].c_tv.tv_sec += timeout; | |
479 | TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); | |
480 | } | |
481 | ||
396c147e | 482 | static int |
f6fdbddf | 483 | conrecycle(int s) |
484 | { | |
f6fdbddf | 485 | con *c = &fdcon[s]; |
50d2fbbc | 486 | int ret; |
f6fdbddf | 487 | |
5061072f | 488 | ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); |
f6fdbddf | 489 | confree(s); |
f6fdbddf | 490 | return (ret); |
491 | } | |
492 | ||
396c147e | 493 | static void |
f6fdbddf | 494 | congreet(int s) |
495 | { | |
2ceb8101 | 496 | int n = 0, remote_major = 0, remote_minor = 0; |
5061072f | 497 | char buf[256], *cp; |
cdc95d6e | 498 | char remote_version[sizeof buf]; |
2ceb8101 | 499 | size_t bufsiz; |
f6fdbddf | 500 | con *c = &fdcon[s]; |
501 | ||
c16c7f20 | 502 | bufsiz = sizeof(buf); |
503 | cp = buf; | |
f581b6e8 | 504 | while (bufsiz-- && (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') { |
578954b1 | 505 | if (*cp == '\r') |
506 | *cp = '\n'; | |
c16c7f20 | 507 | cp++; |
578954b1 | 508 | } |
27452401 | 509 | if (n == 0) { |
05624c18 | 510 | switch (errno) { |
511 | case EPIPE: | |
512 | error("%s: Connection closed by remote host", c->c_name); | |
513 | break; | |
514 | case ECONNREFUSED: | |
515 | break; | |
516 | default: | |
517 | error("read (%s): %s", c->c_name, strerror(errno)); | |
518 | break; | |
519 | } | |
27452401 | 520 | conrecycle(s); |
521 | return; | |
522 | } | |
c16c7f20 | 523 | if (*cp != '\n' && *cp != '\r') { |
f6fdbddf | 524 | error("%s: bad greeting", c->c_name); |
525 | confree(s); | |
526 | return; | |
527 | } | |
c16c7f20 | 528 | *cp = '\0'; |
cdc95d6e | 529 | if (sscanf(buf, "SSH-%d.%d-%[^\n]\n", |
530 | &remote_major, &remote_minor, remote_version) == 3) | |
531 | compat_datafellows(remote_version); | |
532 | else | |
533 | datafellows = 0; | |
5061072f | 534 | if (c->c_keytype != KT_RSA1) { |
5061072f | 535 | if (!ssh2_capable(remote_major, remote_minor)) { |
536 | debug("%s doesn't support ssh2", c->c_name); | |
537 | confree(s); | |
538 | return; | |
539 | } | |
cdc95d6e | 540 | } else if (remote_major != 1) { |
541 | debug("%s doesn't support ssh1", c->c_name); | |
542 | confree(s); | |
543 | return; | |
5061072f | 544 | } |
578954b1 | 545 | fprintf(stderr, "# %s %s\n", c->c_name, chop(buf)); |
5061072f | 546 | n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", |
547 | c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2, | |
548 | c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2); | |
2ceb8101 | 549 | if (n < 0 || (size_t)n >= sizeof(buf)) { |
4b826d75 | 550 | error("snprintf: buffer too small"); |
551 | confree(s); | |
552 | return; | |
553 | } | |
2ceb8101 | 554 | if (atomicio(vwrite, s, buf, n) != (size_t)n) { |
f6fdbddf | 555 | error("write (%s): %s", c->c_name, strerror(errno)); |
556 | confree(s); | |
557 | return; | |
558 | } | |
5061072f | 559 | if (c->c_keytype != KT_RSA1) { |
560 | keyprint(c, keygrab_ssh2(c)); | |
561 | confree(s); | |
562 | return; | |
563 | } | |
f6fdbddf | 564 | c->c_status = CS_SIZE; |
565 | contouch(s); | |
566 | } | |
567 | ||
396c147e | 568 | static void |
f6fdbddf | 569 | conread(int s) |
570 | { | |
f6fdbddf | 571 | con *c = &fdcon[s]; |
05624c18 | 572 | size_t n; |
f6fdbddf | 573 | |
574 | if (c->c_status == CS_CON) { | |
575 | congreet(s); | |
576 | return; | |
577 | } | |
f581b6e8 | 578 | n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off); |
05624c18 | 579 | if (n == 0) { |
f6fdbddf | 580 | error("read (%s): %s", c->c_name, strerror(errno)); |
581 | confree(s); | |
582 | return; | |
583 | } | |
584 | c->c_off += n; | |
585 | ||
586 | if (c->c_off == c->c_len) | |
587 | switch (c->c_status) { | |
588 | case CS_SIZE: | |
589 | c->c_plen = htonl(c->c_plen); | |
590 | c->c_len = c->c_plen + 8 - (c->c_plen & 7); | |
591 | c->c_off = 0; | |
592 | c->c_data = xmalloc(c->c_len); | |
593 | c->c_status = CS_KEYS; | |
594 | break; | |
595 | case CS_KEYS: | |
5061072f | 596 | keyprint(c, keygrab_ssh1(c)); |
f6fdbddf | 597 | confree(s); |
598 | return; | |
599 | break; | |
600 | default: | |
227e8e86 | 601 | fatal("conread: invalid status %d", c->c_status); |
f6fdbddf | 602 | break; |
603 | } | |
604 | ||
605 | contouch(s); | |
606 | } | |
607 | ||
396c147e | 608 | static void |
f6fdbddf | 609 | conloop(void) |
610 | { | |
f6fdbddf | 611 | struct timeval seltime, now; |
50d2fbbc | 612 | fd_set *r, *e; |
f6fdbddf | 613 | con *c; |
50d2fbbc | 614 | int i; |
f6fdbddf | 615 | |
616 | gettimeofday(&now, NULL); | |
48ba8dc8 | 617 | c = TAILQ_FIRST(&tq); |
f6fdbddf | 618 | |
2671b47f | 619 | if (c && (c->c_tv.tv_sec > now.tv_sec || |
620 | (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) { | |
f6fdbddf | 621 | seltime = c->c_tv; |
622 | seltime.tv_sec -= now.tv_sec; | |
623 | seltime.tv_usec -= now.tv_usec; | |
5be2ec5e | 624 | if (seltime.tv_usec < 0) { |
f6fdbddf | 625 | seltime.tv_usec += 1000000; |
626 | seltime.tv_sec--; | |
627 | } | |
628 | } else | |
629 | seltime.tv_sec = seltime.tv_usec = 0; | |
630 | ||
ff7fee59 | 631 | r = xmalloc(read_wait_size); |
632 | memcpy(r, read_wait, read_wait_size); | |
633 | e = xmalloc(read_wait_size); | |
634 | memcpy(e, read_wait, read_wait_size); | |
635 | ||
636 | while (select(maxfd, r, NULL, e, &seltime) == -1 && | |
fd193ca4 | 637 | (errno == EAGAIN || errno == EINTR)) |
638 | ; | |
639 | ||
2671b47f | 640 | for (i = 0; i < maxfd; i++) { |
ff7fee59 | 641 | if (FD_ISSET(i, e)) { |
f6fdbddf | 642 | error("%s: exception!", fdcon[i].c_name); |
643 | confree(i); | |
ff7fee59 | 644 | } else if (FD_ISSET(i, r)) |
f6fdbddf | 645 | conread(i); |
2671b47f | 646 | } |
ff7fee59 | 647 | xfree(r); |
648 | xfree(e); | |
f6fdbddf | 649 | |
48ba8dc8 | 650 | c = TAILQ_FIRST(&tq); |
2671b47f | 651 | while (c && (c->c_tv.tv_sec < now.tv_sec || |
652 | (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) { | |
f6fdbddf | 653 | int s = c->c_fd; |
2671b47f | 654 | |
48ba8dc8 | 655 | c = TAILQ_NEXT(c, c_link); |
f6fdbddf | 656 | conrecycle(s); |
657 | } | |
658 | } | |
659 | ||
5061072f | 660 | static void |
661 | do_host(char *host) | |
f6fdbddf | 662 | { |
5061072f | 663 | char *name = strnnsep(&host, " \t\n"); |
664 | int j; | |
665 | ||
0408c978 | 666 | if (name == NULL) |
667 | return; | |
5061072f | 668 | for (j = KT_RSA1; j <= KT_RSA; j *= 2) { |
669 | if (get_keytypes & j) { | |
670 | while (ncon >= MAXCON) | |
671 | conloop(); | |
672 | conalloc(name, *host ? host : name, j); | |
f6fdbddf | 673 | } |
674 | } | |
675 | } | |
676 | ||
2bae80e9 | 677 | void |
678 | fatal(const char *fmt,...) | |
5061072f | 679 | { |
2bae80e9 | 680 | va_list args; |
50d2fbbc | 681 | |
2bae80e9 | 682 | va_start(args, fmt); |
683 | do_log(SYSLOG_LEVEL_FATAL, fmt, args); | |
684 | va_end(args); | |
5061072f | 685 | if (nonfatal_fatal) |
686 | longjmp(kexjmp, -1); | |
2bae80e9 | 687 | else |
eec6d341 | 688 | exit(255); |
5061072f | 689 | } |
690 | ||
396c147e | 691 | static void |
f6fdbddf | 692 | usage(void) |
693 | { | |
3bafbaa7 | 694 | fprintf(stderr, "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n" |
50d2fbbc | 695 | "\t\t [host | addrlist namelist] [...]\n", |
33e766d2 | 696 | __progname); |
33e766d2 | 697 | exit(1); |
f6fdbddf | 698 | } |
699 | ||
700 | int | |
701 | main(int argc, char **argv) | |
702 | { | |
5061072f | 703 | int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; |
704 | int opt, fopt_count = 0; | |
705 | char *tname; | |
a204806b | 706 | |
5061072f | 707 | extern int optind; |
708 | extern char *optarg; | |
f6fdbddf | 709 | |
fda04d7d | 710 | __progname = ssh_get_progname(argv[0]); |
8782141f | 711 | init_rng(); |
712 | seed_rng(); | |
f6fdbddf | 713 | TAILQ_INIT(&tq); |
714 | ||
fd6168c1 | 715 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
716 | sanitise_stdfd(); | |
717 | ||
5061072f | 718 | if (argc <= 1) |
f6fdbddf | 719 | usage(); |
720 | ||
90a8ae9f | 721 | while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) { |
5061072f | 722 | switch (opt) { |
90a8ae9f | 723 | case 'H': |
724 | hash_hosts = 1; | |
725 | break; | |
5061072f | 726 | case 'p': |
727 | ssh_port = a2port(optarg); | |
728 | if (ssh_port == 0) { | |
729 | fprintf(stderr, "Bad port '%s'\n", optarg); | |
730 | exit(1); | |
731 | } | |
732 | break; | |
733 | case 'T': | |
c8f94200 | 734 | timeout = convtime(optarg); |
735 | if (timeout == -1 || timeout == 0) { | |
736 | fprintf(stderr, "Bad timeout '%s'\n", optarg); | |
f6fdbddf | 737 | usage(); |
c8f94200 | 738 | } |
5061072f | 739 | break; |
740 | case 'v': | |
741 | if (!debug_flag) { | |
742 | debug_flag = 1; | |
743 | log_level = SYSLOG_LEVEL_DEBUG1; | |
744 | } | |
745 | else if (log_level < SYSLOG_LEVEL_DEBUG3) | |
746 | log_level++; | |
747 | else | |
748 | fatal("Too high debugging level."); | |
749 | break; | |
a204806b | 750 | case 'f': |
5061072f | 751 | if (strcmp(optarg, "-") == 0) |
752 | optarg = NULL; | |
753 | argv[fopt_count++] = optarg; | |
754 | break; | |
755 | case 't': | |
756 | get_keytypes = 0; | |
757 | tname = strtok(optarg, ","); | |
758 | while (tname) { | |
759 | int type = key_type_from_name(tname); | |
760 | switch (type) { | |
761 | case KEY_RSA1: | |
762 | get_keytypes |= KT_RSA1; | |
763 | break; | |
764 | case KEY_DSA: | |
765 | get_keytypes |= KT_DSA; | |
766 | break; | |
767 | case KEY_RSA: | |
768 | get_keytypes |= KT_RSA; | |
769 | break; | |
770 | case KEY_UNSPEC: | |
f48e63c8 | 771 | fatal("unknown key type %s", tname); |
5061072f | 772 | } |
773 | tname = strtok(NULL, ","); | |
774 | } | |
775 | break; | |
776 | case '4': | |
777 | IPv4or6 = AF_INET; | |
778 | break; | |
779 | case '6': | |
780 | IPv4or6 = AF_INET6; | |
781 | break; | |
782 | case '?': | |
783 | default: | |
f6fdbddf | 784 | usage(); |
5061072f | 785 | } |
f6fdbddf | 786 | } |
5061072f | 787 | if (optind == argc && !fopt_count) |
f6fdbddf | 788 | usage(); |
789 | ||
5061072f | 790 | log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); |
5061072f | 791 | |
f6fdbddf | 792 | maxfd = fdlim_get(1); |
793 | if (maxfd < 0) | |
227e8e86 | 794 | fatal("%s: fdlim_get: bad value", __progname); |
f6fdbddf | 795 | if (maxfd > MAXMAXFD) |
796 | maxfd = MAXMAXFD; | |
2671b47f | 797 | if (MAXCON <= 0) |
227e8e86 | 798 | fatal("%s: not enough file descriptors", __progname); |
f6fdbddf | 799 | if (maxfd > fdlim_get(0)) |
800 | fdlim_set(maxfd); | |
801 | fdcon = xmalloc(maxfd * sizeof(con)); | |
5be2ec5e | 802 | memset(fdcon, 0, maxfd * sizeof(con)); |
f6fdbddf | 803 | |
ff7fee59 | 804 | read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask); |
805 | read_wait = xmalloc(read_wait_size); | |
806 | memset(read_wait, 0, read_wait_size); | |
807 | ||
5061072f | 808 | if (fopt_count) { |
809 | Linebuf *lb; | |
810 | char *line; | |
811 | int j; | |
812 | ||
813 | for (j = 0; j < fopt_count; j++) { | |
814 | lb = Linebuf_alloc(argv[j], error); | |
b7f79e7a | 815 | if (!lb) |
816 | continue; | |
5061072f | 817 | while ((line = Linebuf_getline(lb)) != NULL) |
818 | do_host(line); | |
819 | Linebuf_free(lb); | |
f6fdbddf | 820 | } |
5061072f | 821 | } |
822 | ||
823 | while (optind < argc) | |
824 | do_host(argv[optind++]); | |
825 | ||
f6fdbddf | 826 | while (ncon > 0) |
827 | conloop(); | |
828 | ||
829 | return (0); | |
830 | } |