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Commit | Line | Data |
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3c0ef626 | 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 | |
6 | * OpenBSD project by leaving this copyright notice intact. | |
7 | */ | |
8 | ||
9 | #include "includes.h" | |
665a873d | 10 | RCSID("$OpenBSD: ssh-keyscan.c,v 1.55 2005/06/17 02:44:33 djm Exp $"); |
3c0ef626 | 11 | |
41b2f314 | 12 | #include "openbsd-compat/sys-queue.h" |
3c0ef626 | 13 | |
14 | #include <openssl/bn.h> | |
15 | ||
16 | #include <setjmp.h> | |
17 | #include "xmalloc.h" | |
18 | #include "ssh.h" | |
19 | #include "ssh1.h" | |
20 | #include "key.h" | |
21 | #include "kex.h" | |
22 | #include "compat.h" | |
23 | #include "myproposal.h" | |
24 | #include "packet.h" | |
25 | #include "dispatch.h" | |
26 | #include "buffer.h" | |
27 | #include "bufaux.h" | |
28 | #include "log.h" | |
29 | #include "atomicio.h" | |
30 | #include "misc.h" | |
996d5e62 | 31 | #include "hostfile.h" |
3c0ef626 | 32 | |
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. */ | |
3c0ef626 | 35 | int IPv4or6 = AF_UNSPEC; |
3c0ef626 | 36 | |
37 | int ssh_port = SSH_DEFAULT_PORT; | |
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 */ | |
44 | ||
996d5e62 | 45 | int hash_hosts = 0; /* Hash hostname on output */ |
46 | ||
3c0ef626 | 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; | |
53 | #define MAXCON (maxfd - 10) | |
54 | ||
3c0ef626 | 55 | extern char *__progname; |
3c0ef626 | 56 | fd_set *read_wait; |
57 | size_t read_wait_size; | |
58 | int ncon; | |
59 | int nonfatal_fatal = 0; | |
60 | jmp_buf kexjmp; | |
61 | Key *kexjmp_key; | |
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 { | |
68 | u_char c_status; /* State of connection on this file desc. */ | |
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. */ | |
77 | int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */ | |
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 */ | |
83 | Kex *c_kex; /* The key-exchange struct for ssh2 */ | |
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; | |
100 | u_int size; | |
101 | int lineno; | |
102 | const char *filename; | |
103 | FILE *stream; | |
104 | void (*errfun) (const char *,...); | |
105 | } Linebuf; | |
106 | ||
107 | static Linebuf * | |
108 | Linebuf_alloc(const char *filename, void (*errfun) (const char *,...)) | |
109 | { | |
110 | Linebuf *lb; | |
111 | ||
112 | if (!(lb = malloc(sizeof(*lb)))) { | |
113 | if (errfun) | |
41b2f314 | 114 | (*errfun) ("linebuf (%s): malloc failed\n", |
115 | filename ? filename : "(stdin)"); | |
3c0ef626 | 116 | return (NULL); |
117 | } | |
118 | if (filename) { | |
119 | lb->filename = filename; | |
120 | if (!(lb->stream = fopen(filename, "r"))) { | |
121 | xfree(lb); | |
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); | |
134 | xfree(lb); | |
135 | return (NULL); | |
136 | } | |
137 | lb->errfun = errfun; | |
138 | lb->lineno = 0; | |
139 | return (lb); | |
140 | } | |
141 | ||
142 | static void | |
143 | Linebuf_free(Linebuf * lb) | |
144 | { | |
145 | fclose(lb->stream); | |
146 | xfree(lb->buf); | |
147 | xfree(lb); | |
148 | } | |
149 | ||
150 | #if 0 | |
151 | static void | |
152 | Linebuf_restart(Linebuf * lb) | |
153 | { | |
154 | clearerr(lb->stream); | |
155 | rewind(lb->stream); | |
156 | lb->lineno = 0; | |
157 | } | |
158 | ||
159 | static int | |
160 | Linebuf_lineno(Linebuf * lb) | |
161 | { | |
162 | return (lb->lineno); | |
163 | } | |
164 | #endif | |
165 | ||
166 | static char * | |
167 | Linebuf_getline(Linebuf * lb) | |
168 | { | |
665a873d | 169 | size_t n = 0; |
41b2f314 | 170 | void *p; |
3c0ef626 | 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) | |
41b2f314 | 177 | (*lb->errfun)("%s: %s\n", lb->filename, |
3c0ef626 | 178 | strerror(errno)); |
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) | |
41b2f314 | 190 | (*lb->errfun)("%s: skipping incomplete last line\n", |
3c0ef626 | 191 | lb->filename); |
192 | return (NULL); | |
193 | } | |
194 | /* Double the buffer if we need more space */ | |
41b2f314 | 195 | lb->size *= 2; |
196 | if ((p = realloc(lb->buf, lb->size)) == NULL) { | |
197 | lb->size /= 2; | |
3c0ef626 | 198 | if (lb->errfun) |
41b2f314 | 199 | (*lb->errfun)("linebuf (%s): realloc failed\n", |
3c0ef626 | 200 | lb->filename); |
201 | return (NULL); | |
202 | } | |
41b2f314 | 203 | lb->buf = p; |
3c0ef626 | 204 | } |
205 | } | |
206 | ||
207 | static int | |
208 | fdlim_get(int hard) | |
209 | { | |
210 | #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE) | |
211 | struct rlimit rlfd; | |
212 | ||
213 | if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) | |
214 | return (-1); | |
215 | if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY) | |
cdd66111 | 216 | return SSH_SYSFDMAX; |
3c0ef626 | 217 | else |
218 | return hard ? rlfd.rlim_max : rlfd.rlim_cur; | |
3c0ef626 | 219 | #else |
cdd66111 | 220 | return SSH_SYSFDMAX; |
3c0ef626 | 221 | #endif |
222 | } | |
223 | ||
224 | static int | |
225 | fdlim_set(int lim) | |
226 | { | |
227 | #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) | |
228 | struct rlimit rlfd; | |
229 | #endif | |
41b2f314 | 230 | |
3c0ef626 | 231 | if (lim <= 0) |
232 | return (-1); | |
233 | #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) | |
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); | |
239 | #elif defined (HAVE_SETDTABLESIZE) | |
240 | setdtablesize(lim); | |
241 | #endif | |
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 | */ | |
250 | static char * | |
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 | */ | |
272 | static char * | |
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 | ||
283 | static Key * | |
284 | keygrab_ssh1(con *c) | |
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 | } | |
293 | buffer_append(&msg, c->c_data, c->c_plen); | |
294 | buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */ | |
295 | if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) { | |
296 | error("%s: invalid packet type", c->c_name); | |
297 | buffer_clear(&msg); | |
298 | return NULL; | |
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); | |
311 | ||
312 | buffer_clear(&msg); | |
313 | ||
314 | return (rsa); | |
315 | } | |
316 | ||
317 | static int | |
318 | hostjump(Key *hostkey) | |
319 | { | |
320 | kexjmp_key = hostkey; | |
321 | longjmp(kexjmp, 1); | |
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); | |
6a9b3198 | 350 | c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
c9f39d2c | 351 | c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; |
6a9b3198 | 352 | c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; |
3c0ef626 | 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(); | |
365 | ||
366 | return j < 0? NULL : kexjmp_key; | |
367 | } | |
368 | ||
369 | static void | |
370 | keyprint(con *c, Key *key) | |
371 | { | |
996d5e62 | 372 | char *host = c->c_output_name ? c->c_output_name : c->c_name; |
373 | ||
3c0ef626 | 374 | if (!key) |
375 | return; | |
996d5e62 | 376 | if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL) |
377 | fatal("host_hash failed"); | |
3c0ef626 | 378 | |
996d5e62 | 379 | fprintf(stdout, "%s ", host); |
3c0ef626 | 380 | key_write(key, stdout); |
381 | fputs("\n", stdout); | |
382 | } | |
383 | ||
384 | static int | |
385 | tcpconnect(char *host) | |
386 | { | |
387 | struct addrinfo hints, *ai, *aitop; | |
388 | char strport[NI_MAXSERV]; | |
389 | int gaierr, s = -1; | |
390 | ||
391 | snprintf(strport, sizeof strport, "%d", ssh_port); | |
392 | memset(&hints, 0, sizeof(hints)); | |
393 | hints.ai_family = IPv4or6; | |
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) { | |
0fff78ff | 398 | s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
3c0ef626 | 399 | if (s < 0) { |
400 | error("socket: %s", strerror(errno)); | |
401 | continue; | |
402 | } | |
c9f39d2c | 403 | if (set_nonblock(s) == -1) |
404 | fatal("%s: set_nonblock(%d)", __func__, s); | |
3c0ef626 | 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 | ||
417 | static int | |
418 | conalloc(char *iname, char *oname, int keytype) | |
419 | { | |
3c0ef626 | 420 | char *namebase, *name, *namelist; |
41b2f314 | 421 | int s; |
3c0ef626 | 422 | |
423 | namebase = namelist = xstrdup(iname); | |
424 | ||
425 | do { | |
426 | name = xstrsep(&namelist, ","); | |
427 | if (!name) { | |
428 | xfree(namebase); | |
429 | return (-1); | |
430 | } | |
431 | } while ((s = tcpconnect(name)) < 0); | |
432 | ||
433 | if (s >= maxfd) | |
434 | fatal("conalloc: fdno %d too high", s); | |
435 | if (fdcon[s].c_status) | |
436 | fatal("conalloc: attempt to reuse fdno %d", s); | |
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; | |
447 | fdcon[s].c_keytype = keytype; | |
448 | gettimeofday(&fdcon[s].c_tv, NULL); | |
449 | fdcon[s].c_tv.tv_sec += timeout; | |
450 | TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); | |
451 | FD_SET(s, read_wait); | |
452 | ncon++; | |
453 | return (s); | |
454 | } | |
455 | ||
456 | static void | |
457 | confree(int s) | |
458 | { | |
459 | if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) | |
460 | fatal("confree: attempt to free bad fdno %d", s); | |
461 | close(s); | |
462 | xfree(fdcon[s].c_namebase); | |
463 | xfree(fdcon[s].c_output_name); | |
464 | if (fdcon[s].c_status == CS_KEYS) | |
465 | xfree(fdcon[s].c_data); | |
466 | fdcon[s].c_status = CS_UNUSED; | |
467 | fdcon[s].c_keytype = 0; | |
468 | TAILQ_REMOVE(&tq, &fdcon[s], c_link); | |
469 | FD_CLR(s, read_wait); | |
470 | ncon--; | |
471 | } | |
472 | ||
473 | static void | |
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 | ||
482 | static int | |
483 | conrecycle(int s) | |
484 | { | |
3c0ef626 | 485 | con *c = &fdcon[s]; |
41b2f314 | 486 | int ret; |
3c0ef626 | 487 | |
488 | ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); | |
489 | confree(s); | |
490 | return (ret); | |
491 | } | |
492 | ||
493 | static void | |
494 | congreet(int s) | |
495 | { | |
665a873d | 496 | int n = 0, remote_major = 0, remote_minor = 0; |
3c0ef626 | 497 | char buf[256], *cp; |
e9a17296 | 498 | char remote_version[sizeof buf]; |
3c0ef626 | 499 | size_t bufsiz; |
3c0ef626 | 500 | con *c = &fdcon[s]; |
501 | ||
502 | bufsiz = sizeof(buf); | |
503 | cp = buf; | |
c9f39d2c | 504 | while (bufsiz-- && (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') { |
3c0ef626 | 505 | if (*cp == '\r') |
506 | *cp = '\n'; | |
507 | cp++; | |
508 | } | |
e9a17296 | 509 | if (n == 0) { |
665a873d | 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 | } | |
e9a17296 | 520 | conrecycle(s); |
521 | return; | |
522 | } | |
3c0ef626 | 523 | if (*cp != '\n' && *cp != '\r') { |
524 | error("%s: bad greeting", c->c_name); | |
525 | confree(s); | |
526 | return; | |
527 | } | |
528 | *cp = '\0'; | |
e9a17296 | 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; | |
3c0ef626 | 534 | if (c->c_keytype != KT_RSA1) { |
3c0ef626 | 535 | if (!ssh2_capable(remote_major, remote_minor)) { |
536 | debug("%s doesn't support ssh2", c->c_name); | |
537 | confree(s); | |
538 | return; | |
539 | } | |
e9a17296 | 540 | } else if (remote_major != 1) { |
541 | debug("%s doesn't support ssh1", c->c_name); | |
542 | confree(s); | |
543 | return; | |
3c0ef626 | 544 | } |
545 | fprintf(stderr, "# %s %s\n", c->c_name, chop(buf)); | |
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); | |
665a873d | 549 | if (n < 0 || (size_t)n >= sizeof(buf)) { |
550 | error("snprintf: buffer too small"); | |
551 | confree(s); | |
552 | return; | |
553 | } | |
554 | if (atomicio(vwrite, s, buf, n) != (size_t)n) { | |
3c0ef626 | 555 | error("write (%s): %s", c->c_name, strerror(errno)); |
556 | confree(s); | |
557 | return; | |
558 | } | |
559 | if (c->c_keytype != KT_RSA1) { | |
560 | keyprint(c, keygrab_ssh2(c)); | |
561 | confree(s); | |
562 | return; | |
563 | } | |
564 | c->c_status = CS_SIZE; | |
565 | contouch(s); | |
566 | } | |
567 | ||
568 | static void | |
569 | conread(int s) | |
570 | { | |
3c0ef626 | 571 | con *c = &fdcon[s]; |
665a873d | 572 | size_t n; |
3c0ef626 | 573 | |
574 | if (c->c_status == CS_CON) { | |
575 | congreet(s); | |
576 | return; | |
577 | } | |
c9f39d2c | 578 | n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off); |
665a873d | 579 | if (n == 0) { |
3c0ef626 | 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: | |
596 | keyprint(c, keygrab_ssh1(c)); | |
597 | confree(s); | |
598 | return; | |
599 | break; | |
600 | default: | |
601 | fatal("conread: invalid status %d", c->c_status); | |
602 | break; | |
603 | } | |
604 | ||
605 | contouch(s); | |
606 | } | |
607 | ||
608 | static void | |
609 | conloop(void) | |
610 | { | |
3c0ef626 | 611 | struct timeval seltime, now; |
41b2f314 | 612 | fd_set *r, *e; |
3c0ef626 | 613 | con *c; |
41b2f314 | 614 | int i; |
3c0ef626 | 615 | |
616 | gettimeofday(&now, NULL); | |
f5799ae1 | 617 | c = TAILQ_FIRST(&tq); |
3c0ef626 | 618 | |
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))) { | |
621 | seltime = c->c_tv; | |
622 | seltime.tv_sec -= now.tv_sec; | |
623 | seltime.tv_usec -= now.tv_usec; | |
624 | if (seltime.tv_usec < 0) { | |
625 | seltime.tv_usec += 1000000; | |
626 | seltime.tv_sec--; | |
627 | } | |
628 | } else | |
629 | seltime.tv_sec = seltime.tv_usec = 0; | |
630 | ||
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 && | |
637 | (errno == EAGAIN || errno == EINTR)) | |
638 | ; | |
639 | ||
640 | for (i = 0; i < maxfd; i++) { | |
641 | if (FD_ISSET(i, e)) { | |
642 | error("%s: exception!", fdcon[i].c_name); | |
643 | confree(i); | |
644 | } else if (FD_ISSET(i, r)) | |
645 | conread(i); | |
646 | } | |
647 | xfree(r); | |
648 | xfree(e); | |
649 | ||
f5799ae1 | 650 | c = TAILQ_FIRST(&tq); |
3c0ef626 | 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))) { | |
653 | int s = c->c_fd; | |
654 | ||
f5799ae1 | 655 | c = TAILQ_NEXT(c, c_link); |
3c0ef626 | 656 | conrecycle(s); |
657 | } | |
658 | } | |
659 | ||
660 | static void | |
661 | do_host(char *host) | |
662 | { | |
663 | char *name = strnnsep(&host, " \t\n"); | |
664 | int j; | |
665 | ||
e9a17296 | 666 | if (name == NULL) |
667 | return; | |
3c0ef626 | 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); | |
673 | } | |
674 | } | |
675 | } | |
676 | ||
e9a17296 | 677 | void |
678 | fatal(const char *fmt,...) | |
3c0ef626 | 679 | { |
e9a17296 | 680 | va_list args; |
41b2f314 | 681 | |
e9a17296 | 682 | va_start(args, fmt); |
683 | do_log(SYSLOG_LEVEL_FATAL, fmt, args); | |
684 | va_end(args); | |
3c0ef626 | 685 | if (nonfatal_fatal) |
686 | longjmp(kexjmp, -1); | |
e9a17296 | 687 | else |
cdd66111 | 688 | exit(255); |
3c0ef626 | 689 | } |
690 | ||
691 | static void | |
692 | usage(void) | |
693 | { | |
996d5e62 | 694 | fprintf(stderr, "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n" |
41b2f314 | 695 | "\t\t [host | addrlist namelist] [...]\n", |
3c0ef626 | 696 | __progname); |
3c0ef626 | 697 | exit(1); |
698 | } | |
699 | ||
700 | int | |
701 | main(int argc, char **argv) | |
702 | { | |
703 | int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; | |
704 | int opt, fopt_count = 0; | |
705 | char *tname; | |
706 | ||
707 | extern int optind; | |
708 | extern char *optarg; | |
709 | ||
0fff78ff | 710 | __progname = ssh_get_progname(argv[0]); |
3c0ef626 | 711 | init_rng(); |
712 | seed_rng(); | |
713 | TAILQ_INIT(&tq); | |
714 | ||
715 | if (argc <= 1) | |
716 | usage(); | |
717 | ||
996d5e62 | 718 | while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) { |
3c0ef626 | 719 | switch (opt) { |
996d5e62 | 720 | case 'H': |
721 | hash_hosts = 1; | |
722 | break; | |
3c0ef626 | 723 | case 'p': |
724 | ssh_port = a2port(optarg); | |
725 | if (ssh_port == 0) { | |
726 | fprintf(stderr, "Bad port '%s'\n", optarg); | |
727 | exit(1); | |
728 | } | |
729 | break; | |
730 | case 'T': | |
41b2f314 | 731 | timeout = convtime(optarg); |
732 | if (timeout == -1 || timeout == 0) { | |
733 | fprintf(stderr, "Bad timeout '%s'\n", optarg); | |
3c0ef626 | 734 | usage(); |
41b2f314 | 735 | } |
3c0ef626 | 736 | break; |
737 | case 'v': | |
738 | if (!debug_flag) { | |
739 | debug_flag = 1; | |
740 | log_level = SYSLOG_LEVEL_DEBUG1; | |
741 | } | |
742 | else if (log_level < SYSLOG_LEVEL_DEBUG3) | |
743 | log_level++; | |
744 | else | |
745 | fatal("Too high debugging level."); | |
746 | break; | |
747 | case 'f': | |
748 | if (strcmp(optarg, "-") == 0) | |
749 | optarg = NULL; | |
750 | argv[fopt_count++] = optarg; | |
751 | break; | |
752 | case 't': | |
753 | get_keytypes = 0; | |
754 | tname = strtok(optarg, ","); | |
755 | while (tname) { | |
756 | int type = key_type_from_name(tname); | |
757 | switch (type) { | |
758 | case KEY_RSA1: | |
759 | get_keytypes |= KT_RSA1; | |
760 | break; | |
761 | case KEY_DSA: | |
762 | get_keytypes |= KT_DSA; | |
763 | break; | |
764 | case KEY_RSA: | |
765 | get_keytypes |= KT_RSA; | |
766 | break; | |
767 | case KEY_UNSPEC: | |
e9a17296 | 768 | fatal("unknown key type %s", tname); |
3c0ef626 | 769 | } |
770 | tname = strtok(NULL, ","); | |
771 | } | |
772 | break; | |
773 | case '4': | |
774 | IPv4or6 = AF_INET; | |
775 | break; | |
776 | case '6': | |
777 | IPv4or6 = AF_INET6; | |
778 | break; | |
779 | case '?': | |
780 | default: | |
781 | usage(); | |
782 | } | |
783 | } | |
784 | if (optind == argc && !fopt_count) | |
785 | usage(); | |
786 | ||
787 | log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); | |
3c0ef626 | 788 | |
789 | maxfd = fdlim_get(1); | |
790 | if (maxfd < 0) | |
791 | fatal("%s: fdlim_get: bad value", __progname); | |
792 | if (maxfd > MAXMAXFD) | |
793 | maxfd = MAXMAXFD; | |
794 | if (MAXCON <= 0) | |
795 | fatal("%s: not enough file descriptors", __progname); | |
796 | if (maxfd > fdlim_get(0)) | |
797 | fdlim_set(maxfd); | |
798 | fdcon = xmalloc(maxfd * sizeof(con)); | |
799 | memset(fdcon, 0, maxfd * sizeof(con)); | |
800 | ||
801 | read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask); | |
802 | read_wait = xmalloc(read_wait_size); | |
803 | memset(read_wait, 0, read_wait_size); | |
804 | ||
805 | if (fopt_count) { | |
806 | Linebuf *lb; | |
807 | char *line; | |
808 | int j; | |
809 | ||
810 | for (j = 0; j < fopt_count; j++) { | |
811 | lb = Linebuf_alloc(argv[j], error); | |
812 | if (!lb) | |
813 | continue; | |
814 | while ((line = Linebuf_getline(lb)) != NULL) | |
815 | do_host(line); | |
816 | Linebuf_free(lb); | |
817 | } | |
818 | } | |
819 | ||
820 | while (optind < argc) | |
821 | do_host(argv[optind++]); | |
822 | ||
823 | while (ncon > 0) | |
824 | conloop(); | |
825 | ||
826 | return (0); | |
827 | } |