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1 | /* $OpenBSD: ssh-keyscan.c,v 1.78 2009/01/22 10:02:34 djm Exp $ */ | |
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 | |
7 | * OpenBSD project by leaving this copyright notice intact. | |
8 | */ | |
9 | ||
10 | #include "includes.h" | |
11 | ||
12 | #include "openbsd-compat/sys-queue.h" | |
13 | #include <sys/resource.h> | |
14 | #ifdef HAVE_SYS_TIME_H | |
15 | # include <sys/time.h> | |
16 | #endif | |
17 | ||
18 | #include <netinet/in.h> | |
19 | #include <arpa/inet.h> | |
20 | ||
21 | #include <openssl/bn.h> | |
22 | ||
23 | #include <netdb.h> | |
24 | #include <errno.h> | |
25 | #include <setjmp.h> | |
26 | #include <stdarg.h> | |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <signal.h> | |
30 | #include <string.h> | |
31 | #include <unistd.h> | |
32 | ||
33 | #include "xmalloc.h" | |
34 | #include "ssh.h" | |
35 | #include "ssh1.h" | |
36 | #include "buffer.h" | |
37 | #include "key.h" | |
38 | #include "cipher.h" | |
39 | #include "kex.h" | |
40 | #include "compat.h" | |
41 | #include "myproposal.h" | |
42 | #include "packet.h" | |
43 | #include "dispatch.h" | |
44 | #include "log.h" | |
45 | #include "atomicio.h" | |
46 | #include "misc.h" | |
47 | #include "hostfile.h" | |
48 | ||
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. */ | |
51 | int IPv4or6 = AF_UNSPEC; | |
52 | ||
53 | int ssh_port = SSH_DEFAULT_PORT; | |
54 | ||
55 | #define KT_RSA1 1 | |
56 | #define KT_DSA 2 | |
57 | #define KT_RSA 4 | |
58 | ||
59 | int get_keytypes = KT_RSA; /* Get only RSA keys by default */ | |
60 | ||
61 | int hash_hosts = 0; /* Hash hostname on output */ | |
62 | ||
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; | |
69 | #define MAXCON (maxfd - 10) | |
70 | ||
71 | extern char *__progname; | |
72 | fd_set *read_wait; | |
73 | size_t read_wait_nfdset; | |
74 | int ncon; | |
75 | int nonfatal_fatal = 0; | |
76 | jmp_buf kexjmp; | |
77 | Key *kexjmp_key; | |
78 | ||
79 | /* | |
80 | * Keep a connection structure for each file descriptor. The state | |
81 | * associated with file descriptor n is held in fdcon[n]. | |
82 | */ | |
83 | typedef struct Connection { | |
84 | u_char c_status; /* State of connection on this file desc. */ | |
85 | #define CS_UNUSED 0 /* File descriptor unused */ | |
86 | #define CS_CON 1 /* Waiting to connect/read greeting */ | |
87 | #define CS_SIZE 2 /* Waiting to read initial packet size */ | |
88 | #define CS_KEYS 3 /* Waiting to read public key packet */ | |
89 | int c_fd; /* Quick lookup: c->c_fd == c - fdcon */ | |
90 | int c_plen; /* Packet length field for ssh packet */ | |
91 | int c_len; /* Total bytes which must be read. */ | |
92 | int c_off; /* Length of data read so far. */ | |
93 | int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */ | |
94 | char *c_namebase; /* Address to free for c_name and c_namelist */ | |
95 | char *c_name; /* Hostname of connection for errors */ | |
96 | char *c_namelist; /* Pointer to other possible addresses */ | |
97 | char *c_output_name; /* Hostname of connection for output */ | |
98 | char *c_data; /* Data read from this fd */ | |
99 | Kex *c_kex; /* The key-exchange struct for ssh2 */ | |
100 | struct timeval c_tv; /* Time at which connection gets aborted */ | |
101 | TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */ | |
102 | } con; | |
103 | ||
104 | TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */ | |
105 | con *fdcon; | |
106 | ||
107 | /* | |
108 | * This is just a wrapper around fgets() to make it usable. | |
109 | */ | |
110 | ||
111 | /* Stress-test. Increase this later. */ | |
112 | #define LINEBUF_SIZE 16 | |
113 | ||
114 | typedef struct { | |
115 | char *buf; | |
116 | u_int size; | |
117 | int lineno; | |
118 | const char *filename; | |
119 | FILE *stream; | |
120 | void (*errfun) (const char *,...); | |
121 | } Linebuf; | |
122 | ||
123 | static Linebuf * | |
124 | Linebuf_alloc(const char *filename, void (*errfun) (const char *,...)) | |
125 | { | |
126 | Linebuf *lb; | |
127 | ||
128 | if (!(lb = malloc(sizeof(*lb)))) { | |
129 | if (errfun) | |
130 | (*errfun) ("linebuf (%s): malloc failed\n", | |
131 | filename ? filename : "(stdin)"); | |
132 | return (NULL); | |
133 | } | |
134 | if (filename) { | |
135 | lb->filename = filename; | |
136 | if (!(lb->stream = fopen(filename, "r"))) { | |
137 | xfree(lb); | |
138 | if (errfun) | |
139 | (*errfun) ("%s: %s\n", filename, strerror(errno)); | |
140 | return (NULL); | |
141 | } | |
142 | } else { | |
143 | lb->filename = "(stdin)"; | |
144 | lb->stream = stdin; | |
145 | } | |
146 | ||
147 | if (!(lb->buf = malloc((lb->size = LINEBUF_SIZE)))) { | |
148 | if (errfun) | |
149 | (*errfun) ("linebuf (%s): malloc failed\n", lb->filename); | |
150 | xfree(lb); | |
151 | return (NULL); | |
152 | } | |
153 | lb->errfun = errfun; | |
154 | lb->lineno = 0; | |
155 | return (lb); | |
156 | } | |
157 | ||
158 | static void | |
159 | Linebuf_free(Linebuf * lb) | |
160 | { | |
161 | fclose(lb->stream); | |
162 | xfree(lb->buf); | |
163 | xfree(lb); | |
164 | } | |
165 | ||
166 | #if 0 | |
167 | static void | |
168 | Linebuf_restart(Linebuf * lb) | |
169 | { | |
170 | clearerr(lb->stream); | |
171 | rewind(lb->stream); | |
172 | lb->lineno = 0; | |
173 | } | |
174 | ||
175 | static int | |
176 | Linebuf_lineno(Linebuf * lb) | |
177 | { | |
178 | return (lb->lineno); | |
179 | } | |
180 | #endif | |
181 | ||
182 | static char * | |
183 | Linebuf_getline(Linebuf * lb) | |
184 | { | |
185 | size_t n = 0; | |
186 | void *p; | |
187 | ||
188 | lb->lineno++; | |
189 | for (;;) { | |
190 | /* Read a line */ | |
191 | if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) { | |
192 | if (ferror(lb->stream) && lb->errfun) | |
193 | (*lb->errfun)("%s: %s\n", lb->filename, | |
194 | strerror(errno)); | |
195 | return (NULL); | |
196 | } | |
197 | n = strlen(lb->buf); | |
198 | ||
199 | /* Return it or an error if it fits */ | |
200 | if (n > 0 && lb->buf[n - 1] == '\n') { | |
201 | lb->buf[n - 1] = '\0'; | |
202 | return (lb->buf); | |
203 | } | |
204 | if (n != lb->size - 1) { | |
205 | if (lb->errfun) | |
206 | (*lb->errfun)("%s: skipping incomplete last line\n", | |
207 | lb->filename); | |
208 | return (NULL); | |
209 | } | |
210 | /* Double the buffer if we need more space */ | |
211 | lb->size *= 2; | |
212 | if ((p = realloc(lb->buf, lb->size)) == NULL) { | |
213 | lb->size /= 2; | |
214 | if (lb->errfun) | |
215 | (*lb->errfun)("linebuf (%s): realloc failed\n", | |
216 | lb->filename); | |
217 | return (NULL); | |
218 | } | |
219 | lb->buf = p; | |
220 | } | |
221 | } | |
222 | ||
223 | static int | |
224 | fdlim_get(int hard) | |
225 | { | |
226 | #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE) | |
227 | struct rlimit rlfd; | |
228 | ||
229 | if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) | |
230 | return (-1); | |
231 | if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY) | |
232 | return SSH_SYSFDMAX; | |
233 | else | |
234 | return hard ? rlfd.rlim_max : rlfd.rlim_cur; | |
235 | #else | |
236 | return SSH_SYSFDMAX; | |
237 | #endif | |
238 | } | |
239 | ||
240 | static int | |
241 | fdlim_set(int lim) | |
242 | { | |
243 | #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) | |
244 | struct rlimit rlfd; | |
245 | #endif | |
246 | ||
247 | if (lim <= 0) | |
248 | return (-1); | |
249 | #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) | |
250 | if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) | |
251 | return (-1); | |
252 | rlfd.rlim_cur = lim; | |
253 | if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0) | |
254 | return (-1); | |
255 | #elif defined (HAVE_SETDTABLESIZE) | |
256 | setdtablesize(lim); | |
257 | #endif | |
258 | return (0); | |
259 | } | |
260 | ||
261 | /* | |
262 | * This is an strsep function that returns a null field for adjacent | |
263 | * separators. This is the same as the 4.4BSD strsep, but different from the | |
264 | * one in the GNU libc. | |
265 | */ | |
266 | static char * | |
267 | xstrsep(char **str, const char *delim) | |
268 | { | |
269 | char *s, *e; | |
270 | ||
271 | if (!**str) | |
272 | return (NULL); | |
273 | ||
274 | s = *str; | |
275 | e = s + strcspn(s, delim); | |
276 | ||
277 | if (*e != '\0') | |
278 | *e++ = '\0'; | |
279 | *str = e; | |
280 | ||
281 | return (s); | |
282 | } | |
283 | ||
284 | /* | |
285 | * Get the next non-null token (like GNU strsep). Strsep() will return a | |
286 | * null token for two adjacent separators, so we may have to loop. | |
287 | */ | |
288 | static char * | |
289 | strnnsep(char **stringp, char *delim) | |
290 | { | |
291 | char *tok; | |
292 | ||
293 | do { | |
294 | tok = xstrsep(stringp, delim); | |
295 | } while (tok && *tok == '\0'); | |
296 | return (tok); | |
297 | } | |
298 | ||
299 | static Key * | |
300 | keygrab_ssh1(con *c) | |
301 | { | |
302 | static Key *rsa; | |
303 | static Buffer msg; | |
304 | ||
305 | if (rsa == NULL) { | |
306 | buffer_init(&msg); | |
307 | rsa = key_new(KEY_RSA1); | |
308 | } | |
309 | buffer_append(&msg, c->c_data, c->c_plen); | |
310 | buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */ | |
311 | if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) { | |
312 | error("%s: invalid packet type", c->c_name); | |
313 | buffer_clear(&msg); | |
314 | return NULL; | |
315 | } | |
316 | buffer_consume(&msg, 8); /* cookie */ | |
317 | ||
318 | /* server key */ | |
319 | (void) buffer_get_int(&msg); | |
320 | buffer_get_bignum(&msg, rsa->rsa->e); | |
321 | buffer_get_bignum(&msg, rsa->rsa->n); | |
322 | ||
323 | /* host key */ | |
324 | (void) buffer_get_int(&msg); | |
325 | buffer_get_bignum(&msg, rsa->rsa->e); | |
326 | buffer_get_bignum(&msg, rsa->rsa->n); | |
327 | ||
328 | buffer_clear(&msg); | |
329 | ||
330 | return (rsa); | |
331 | } | |
332 | ||
333 | static int | |
334 | hostjump(Key *hostkey) | |
335 | { | |
336 | kexjmp_key = hostkey; | |
337 | longjmp(kexjmp, 1); | |
338 | } | |
339 | ||
340 | static int | |
341 | ssh2_capable(int remote_major, int remote_minor) | |
342 | { | |
343 | switch (remote_major) { | |
344 | case 1: | |
345 | if (remote_minor == 99) | |
346 | return 1; | |
347 | break; | |
348 | case 2: | |
349 | return 1; | |
350 | default: | |
351 | break; | |
352 | } | |
353 | return 0; | |
354 | } | |
355 | ||
356 | static Key * | |
357 | keygrab_ssh2(con *c) | |
358 | { | |
359 | int j; | |
360 | ||
361 | packet_set_connection(c->c_fd, c->c_fd); | |
362 | enable_compat20(); | |
363 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA? | |
364 | "ssh-dss": "ssh-rsa"; | |
365 | c->c_kex = kex_setup(myproposal); | |
366 | c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; | |
367 | c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; | |
368 | c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; | |
369 | c->c_kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; | |
370 | c->c_kex->verify_host_key = hostjump; | |
371 | ||
372 | if (!(j = setjmp(kexjmp))) { | |
373 | nonfatal_fatal = 1; | |
374 | dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex); | |
375 | fprintf(stderr, "Impossible! dispatch_run() returned!\n"); | |
376 | exit(1); | |
377 | } | |
378 | nonfatal_fatal = 0; | |
379 | xfree(c->c_kex); | |
380 | c->c_kex = NULL; | |
381 | packet_close(); | |
382 | ||
383 | return j < 0? NULL : kexjmp_key; | |
384 | } | |
385 | ||
386 | static void | |
387 | keyprint(con *c, Key *key) | |
388 | { | |
389 | char *host = c->c_output_name ? c->c_output_name : c->c_name; | |
390 | ||
391 | if (!key) | |
392 | return; | |
393 | if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL) | |
394 | fatal("host_hash failed"); | |
395 | ||
396 | fprintf(stdout, "%s ", host); | |
397 | key_write(key, stdout); | |
398 | fputs("\n", stdout); | |
399 | } | |
400 | ||
401 | static int | |
402 | tcpconnect(char *host) | |
403 | { | |
404 | struct addrinfo hints, *ai, *aitop; | |
405 | char strport[NI_MAXSERV]; | |
406 | int gaierr, s = -1; | |
407 | ||
408 | snprintf(strport, sizeof strport, "%d", ssh_port); | |
409 | memset(&hints, 0, sizeof(hints)); | |
410 | hints.ai_family = IPv4or6; | |
411 | hints.ai_socktype = SOCK_STREAM; | |
412 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) | |
413 | fatal("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr)); | |
414 | for (ai = aitop; ai; ai = ai->ai_next) { | |
415 | s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); | |
416 | if (s < 0) { | |
417 | error("socket: %s", strerror(errno)); | |
418 | continue; | |
419 | } | |
420 | if (set_nonblock(s) == -1) | |
421 | fatal("%s: set_nonblock(%d)", __func__, s); | |
422 | if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 && | |
423 | errno != EINPROGRESS) | |
424 | error("connect (`%s'): %s", host, strerror(errno)); | |
425 | else | |
426 | break; | |
427 | close(s); | |
428 | s = -1; | |
429 | } | |
430 | freeaddrinfo(aitop); | |
431 | return s; | |
432 | } | |
433 | ||
434 | static int | |
435 | conalloc(char *iname, char *oname, int keytype) | |
436 | { | |
437 | char *namebase, *name, *namelist; | |
438 | int s; | |
439 | ||
440 | namebase = namelist = xstrdup(iname); | |
441 | ||
442 | do { | |
443 | name = xstrsep(&namelist, ","); | |
444 | if (!name) { | |
445 | xfree(namebase); | |
446 | return (-1); | |
447 | } | |
448 | } while ((s = tcpconnect(name)) < 0); | |
449 | ||
450 | if (s >= maxfd) | |
451 | fatal("conalloc: fdno %d too high", s); | |
452 | if (fdcon[s].c_status) | |
453 | fatal("conalloc: attempt to reuse fdno %d", s); | |
454 | ||
455 | fdcon[s].c_fd = s; | |
456 | fdcon[s].c_status = CS_CON; | |
457 | fdcon[s].c_namebase = namebase; | |
458 | fdcon[s].c_name = name; | |
459 | fdcon[s].c_namelist = namelist; | |
460 | fdcon[s].c_output_name = xstrdup(oname); | |
461 | fdcon[s].c_data = (char *) &fdcon[s].c_plen; | |
462 | fdcon[s].c_len = 4; | |
463 | fdcon[s].c_off = 0; | |
464 | fdcon[s].c_keytype = keytype; | |
465 | gettimeofday(&fdcon[s].c_tv, NULL); | |
466 | fdcon[s].c_tv.tv_sec += timeout; | |
467 | TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); | |
468 | FD_SET(s, read_wait); | |
469 | ncon++; | |
470 | return (s); | |
471 | } | |
472 | ||
473 | static void | |
474 | confree(int s) | |
475 | { | |
476 | if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) | |
477 | fatal("confree: attempt to free bad fdno %d", s); | |
478 | close(s); | |
479 | xfree(fdcon[s].c_namebase); | |
480 | xfree(fdcon[s].c_output_name); | |
481 | if (fdcon[s].c_status == CS_KEYS) | |
482 | xfree(fdcon[s].c_data); | |
483 | fdcon[s].c_status = CS_UNUSED; | |
484 | fdcon[s].c_keytype = 0; | |
485 | TAILQ_REMOVE(&tq, &fdcon[s], c_link); | |
486 | FD_CLR(s, read_wait); | |
487 | ncon--; | |
488 | } | |
489 | ||
490 | static void | |
491 | contouch(int s) | |
492 | { | |
493 | TAILQ_REMOVE(&tq, &fdcon[s], c_link); | |
494 | gettimeofday(&fdcon[s].c_tv, NULL); | |
495 | fdcon[s].c_tv.tv_sec += timeout; | |
496 | TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); | |
497 | } | |
498 | ||
499 | static int | |
500 | conrecycle(int s) | |
501 | { | |
502 | con *c = &fdcon[s]; | |
503 | int ret; | |
504 | ||
505 | ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); | |
506 | confree(s); | |
507 | return (ret); | |
508 | } | |
509 | ||
510 | static void | |
511 | congreet(int s) | |
512 | { | |
513 | int n = 0, remote_major = 0, remote_minor = 0; | |
514 | char buf[256], *cp; | |
515 | char remote_version[sizeof buf]; | |
516 | size_t bufsiz; | |
517 | con *c = &fdcon[s]; | |
518 | ||
519 | for (;;) { | |
520 | memset(buf, '\0', sizeof(buf)); | |
521 | bufsiz = sizeof(buf); | |
522 | cp = buf; | |
523 | while (bufsiz-- && | |
524 | (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') { | |
525 | if (*cp == '\r') | |
526 | *cp = '\n'; | |
527 | cp++; | |
528 | } | |
529 | if (n != 1 || strncmp(buf, "SSH-", 4) == 0) | |
530 | break; | |
531 | } | |
532 | if (n == 0) { | |
533 | switch (errno) { | |
534 | case EPIPE: | |
535 | error("%s: Connection closed by remote host", c->c_name); | |
536 | break; | |
537 | case ECONNREFUSED: | |
538 | break; | |
539 | default: | |
540 | error("read (%s): %s", c->c_name, strerror(errno)); | |
541 | break; | |
542 | } | |
543 | conrecycle(s); | |
544 | return; | |
545 | } | |
546 | if (*cp != '\n' && *cp != '\r') { | |
547 | error("%s: bad greeting", c->c_name); | |
548 | confree(s); | |
549 | return; | |
550 | } | |
551 | *cp = '\0'; | |
552 | if (sscanf(buf, "SSH-%d.%d-%[^\n]\n", | |
553 | &remote_major, &remote_minor, remote_version) == 3) | |
554 | compat_datafellows(remote_version); | |
555 | else | |
556 | datafellows = 0; | |
557 | if (c->c_keytype != KT_RSA1) { | |
558 | if (!ssh2_capable(remote_major, remote_minor)) { | |
559 | debug("%s doesn't support ssh2", c->c_name); | |
560 | confree(s); | |
561 | return; | |
562 | } | |
563 | } else if (remote_major != 1) { | |
564 | debug("%s doesn't support ssh1", c->c_name); | |
565 | confree(s); | |
566 | return; | |
567 | } | |
568 | fprintf(stderr, "# %s %s\n", c->c_name, chop(buf)); | |
569 | n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", | |
570 | c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2, | |
571 | c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2); | |
572 | if (n < 0 || (size_t)n >= sizeof(buf)) { | |
573 | error("snprintf: buffer too small"); | |
574 | confree(s); | |
575 | return; | |
576 | } | |
577 | if (atomicio(vwrite, s, buf, n) != (size_t)n) { | |
578 | error("write (%s): %s", c->c_name, strerror(errno)); | |
579 | confree(s); | |
580 | return; | |
581 | } | |
582 | if (c->c_keytype != KT_RSA1) { | |
583 | keyprint(c, keygrab_ssh2(c)); | |
584 | confree(s); | |
585 | return; | |
586 | } | |
587 | c->c_status = CS_SIZE; | |
588 | contouch(s); | |
589 | } | |
590 | ||
591 | static void | |
592 | conread(int s) | |
593 | { | |
594 | con *c = &fdcon[s]; | |
595 | size_t n; | |
596 | ||
597 | if (c->c_status == CS_CON) { | |
598 | congreet(s); | |
599 | return; | |
600 | } | |
601 | n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off); | |
602 | if (n == 0) { | |
603 | error("read (%s): %s", c->c_name, strerror(errno)); | |
604 | confree(s); | |
605 | return; | |
606 | } | |
607 | c->c_off += n; | |
608 | ||
609 | if (c->c_off == c->c_len) | |
610 | switch (c->c_status) { | |
611 | case CS_SIZE: | |
612 | c->c_plen = htonl(c->c_plen); | |
613 | c->c_len = c->c_plen + 8 - (c->c_plen & 7); | |
614 | c->c_off = 0; | |
615 | c->c_data = xmalloc(c->c_len); | |
616 | c->c_status = CS_KEYS; | |
617 | break; | |
618 | case CS_KEYS: | |
619 | keyprint(c, keygrab_ssh1(c)); | |
620 | confree(s); | |
621 | return; | |
622 | default: | |
623 | fatal("conread: invalid status %d", c->c_status); | |
624 | break; | |
625 | } | |
626 | ||
627 | contouch(s); | |
628 | } | |
629 | ||
630 | static void | |
631 | conloop(void) | |
632 | { | |
633 | struct timeval seltime, now; | |
634 | fd_set *r, *e; | |
635 | con *c; | |
636 | int i; | |
637 | ||
638 | gettimeofday(&now, NULL); | |
639 | c = TAILQ_FIRST(&tq); | |
640 | ||
641 | if (c && (c->c_tv.tv_sec > now.tv_sec || | |
642 | (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) { | |
643 | seltime = c->c_tv; | |
644 | seltime.tv_sec -= now.tv_sec; | |
645 | seltime.tv_usec -= now.tv_usec; | |
646 | if (seltime.tv_usec < 0) { | |
647 | seltime.tv_usec += 1000000; | |
648 | seltime.tv_sec--; | |
649 | } | |
650 | } else | |
651 | seltime.tv_sec = seltime.tv_usec = 0; | |
652 | ||
653 | r = xcalloc(read_wait_nfdset, sizeof(fd_mask)); | |
654 | e = xcalloc(read_wait_nfdset, sizeof(fd_mask)); | |
655 | memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask)); | |
656 | memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask)); | |
657 | ||
658 | while (select(maxfd, r, NULL, e, &seltime) == -1 && | |
659 | (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) | |
660 | ; | |
661 | ||
662 | for (i = 0; i < maxfd; i++) { | |
663 | if (FD_ISSET(i, e)) { | |
664 | error("%s: exception!", fdcon[i].c_name); | |
665 | confree(i); | |
666 | } else if (FD_ISSET(i, r)) | |
667 | conread(i); | |
668 | } | |
669 | xfree(r); | |
670 | xfree(e); | |
671 | ||
672 | c = TAILQ_FIRST(&tq); | |
673 | while (c && (c->c_tv.tv_sec < now.tv_sec || | |
674 | (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) { | |
675 | int s = c->c_fd; | |
676 | ||
677 | c = TAILQ_NEXT(c, c_link); | |
678 | conrecycle(s); | |
679 | } | |
680 | } | |
681 | ||
682 | static void | |
683 | do_host(char *host) | |
684 | { | |
685 | char *name = strnnsep(&host, " \t\n"); | |
686 | int j; | |
687 | ||
688 | if (name == NULL) | |
689 | return; | |
690 | for (j = KT_RSA1; j <= KT_RSA; j *= 2) { | |
691 | if (get_keytypes & j) { | |
692 | while (ncon >= MAXCON) | |
693 | conloop(); | |
694 | conalloc(name, *host ? host : name, j); | |
695 | } | |
696 | } | |
697 | } | |
698 | ||
699 | void | |
700 | fatal(const char *fmt,...) | |
701 | { | |
702 | va_list args; | |
703 | ||
704 | va_start(args, fmt); | |
705 | do_log(SYSLOG_LEVEL_FATAL, fmt, args); | |
706 | va_end(args); | |
707 | if (nonfatal_fatal) | |
708 | longjmp(kexjmp, -1); | |
709 | else | |
710 | exit(255); | |
711 | } | |
712 | ||
713 | static void | |
714 | usage(void) | |
715 | { | |
716 | fprintf(stderr, | |
717 | "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n" | |
718 | "\t\t [host | addrlist namelist] ...\n", | |
719 | __progname); | |
720 | exit(1); | |
721 | } | |
722 | ||
723 | int | |
724 | main(int argc, char **argv) | |
725 | { | |
726 | int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; | |
727 | int opt, fopt_count = 0; | |
728 | char *tname; | |
729 | ||
730 | extern int optind; | |
731 | extern char *optarg; | |
732 | ||
733 | __progname = ssh_get_progname(argv[0]); | |
734 | init_rng(); | |
735 | seed_rng(); | |
736 | TAILQ_INIT(&tq); | |
737 | ||
738 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ | |
739 | sanitise_stdfd(); | |
740 | ||
741 | if (argc <= 1) | |
742 | usage(); | |
743 | ||
744 | while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) { | |
745 | switch (opt) { | |
746 | case 'H': | |
747 | hash_hosts = 1; | |
748 | break; | |
749 | case 'p': | |
750 | ssh_port = a2port(optarg); | |
751 | if (ssh_port <= 0) { | |
752 | fprintf(stderr, "Bad port '%s'\n", optarg); | |
753 | exit(1); | |
754 | } | |
755 | break; | |
756 | case 'T': | |
757 | timeout = convtime(optarg); | |
758 | if (timeout == -1 || timeout == 0) { | |
759 | fprintf(stderr, "Bad timeout '%s'\n", optarg); | |
760 | usage(); | |
761 | } | |
762 | break; | |
763 | case 'v': | |
764 | if (!debug_flag) { | |
765 | debug_flag = 1; | |
766 | log_level = SYSLOG_LEVEL_DEBUG1; | |
767 | } | |
768 | else if (log_level < SYSLOG_LEVEL_DEBUG3) | |
769 | log_level++; | |
770 | else | |
771 | fatal("Too high debugging level."); | |
772 | break; | |
773 | case 'f': | |
774 | if (strcmp(optarg, "-") == 0) | |
775 | optarg = NULL; | |
776 | argv[fopt_count++] = optarg; | |
777 | break; | |
778 | case 't': | |
779 | get_keytypes = 0; | |
780 | tname = strtok(optarg, ","); | |
781 | while (tname) { | |
782 | int type = key_type_from_name(tname); | |
783 | switch (type) { | |
784 | case KEY_RSA1: | |
785 | get_keytypes |= KT_RSA1; | |
786 | break; | |
787 | case KEY_DSA: | |
788 | get_keytypes |= KT_DSA; | |
789 | break; | |
790 | case KEY_RSA: | |
791 | get_keytypes |= KT_RSA; | |
792 | break; | |
793 | case KEY_UNSPEC: | |
794 | fatal("unknown key type %s", tname); | |
795 | } | |
796 | tname = strtok(NULL, ","); | |
797 | } | |
798 | break; | |
799 | case '4': | |
800 | IPv4or6 = AF_INET; | |
801 | break; | |
802 | case '6': | |
803 | IPv4or6 = AF_INET6; | |
804 | break; | |
805 | case '?': | |
806 | default: | |
807 | usage(); | |
808 | } | |
809 | } | |
810 | if (optind == argc && !fopt_count) | |
811 | usage(); | |
812 | ||
813 | log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); | |
814 | ||
815 | maxfd = fdlim_get(1); | |
816 | if (maxfd < 0) | |
817 | fatal("%s: fdlim_get: bad value", __progname); | |
818 | if (maxfd > MAXMAXFD) | |
819 | maxfd = MAXMAXFD; | |
820 | if (MAXCON <= 0) | |
821 | fatal("%s: not enough file descriptors", __progname); | |
822 | if (maxfd > fdlim_get(0)) | |
823 | fdlim_set(maxfd); | |
824 | fdcon = xcalloc(maxfd, sizeof(con)); | |
825 | ||
826 | read_wait_nfdset = howmany(maxfd, NFDBITS); | |
827 | read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask)); | |
828 | ||
829 | if (fopt_count) { | |
830 | Linebuf *lb; | |
831 | char *line; | |
832 | int j; | |
833 | ||
834 | for (j = 0; j < fopt_count; j++) { | |
835 | lb = Linebuf_alloc(argv[j], error); | |
836 | if (!lb) | |
837 | continue; | |
838 | while ((line = Linebuf_getline(lb)) != NULL) | |
839 | do_host(line); | |
840 | Linebuf_free(lb); | |
841 | } | |
842 | } | |
843 | ||
844 | while (optind < argc) | |
845 | do_host(argv[optind++]); | |
846 | ||
847 | while (ncon > 0) | |
848 | conloop(); | |
849 | ||
850 | return (0); | |
851 | } |