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1 | /* $OpenBSD: ssh-keyscan.c,v 1.80 2009/12/25 19:40:21 stevesk 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 | /* The default routing domain */ | |
72 | int scan_rdomain = -1; | |
73 | ||
74 | extern char *__progname; | |
75 | fd_set *read_wait; | |
76 | size_t read_wait_nfdset; | |
77 | int ncon; | |
78 | int nonfatal_fatal = 0; | |
79 | jmp_buf kexjmp; | |
80 | Key *kexjmp_key; | |
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 { | |
87 | u_char c_status; /* State of connection on this file desc. */ | |
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. */ | |
96 | int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */ | |
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 */ | |
102 | Kex *c_kex; /* The key-exchange struct for ssh2 */ | |
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; | |
119 | u_int size; | |
120 | int lineno; | |
121 | const char *filename; | |
122 | FILE *stream; | |
123 | void (*errfun) (const char *,...); | |
124 | } Linebuf; | |
125 | ||
126 | static Linebuf * | |
127 | Linebuf_alloc(const char *filename, void (*errfun) (const char *,...)) | |
128 | { | |
129 | Linebuf *lb; | |
130 | ||
131 | if (!(lb = malloc(sizeof(*lb)))) { | |
132 | if (errfun) | |
133 | (*errfun) ("linebuf (%s): malloc failed\n", | |
134 | filename ? filename : "(stdin)"); | |
135 | return (NULL); | |
136 | } | |
137 | if (filename) { | |
138 | lb->filename = filename; | |
139 | if (!(lb->stream = fopen(filename, "r"))) { | |
140 | xfree(lb); | |
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 | ||
150 | if (!(lb->buf = malloc((lb->size = LINEBUF_SIZE)))) { | |
151 | if (errfun) | |
152 | (*errfun) ("linebuf (%s): malloc failed\n", lb->filename); | |
153 | xfree(lb); | |
154 | return (NULL); | |
155 | } | |
156 | lb->errfun = errfun; | |
157 | lb->lineno = 0; | |
158 | return (lb); | |
159 | } | |
160 | ||
161 | static void | |
162 | Linebuf_free(Linebuf * lb) | |
163 | { | |
164 | fclose(lb->stream); | |
165 | xfree(lb->buf); | |
166 | xfree(lb); | |
167 | } | |
168 | ||
169 | #if 0 | |
170 | static void | |
171 | Linebuf_restart(Linebuf * lb) | |
172 | { | |
173 | clearerr(lb->stream); | |
174 | rewind(lb->stream); | |
175 | lb->lineno = 0; | |
176 | } | |
177 | ||
178 | static int | |
179 | Linebuf_lineno(Linebuf * lb) | |
180 | { | |
181 | return (lb->lineno); | |
182 | } | |
183 | #endif | |
184 | ||
185 | static char * | |
186 | Linebuf_getline(Linebuf * lb) | |
187 | { | |
188 | size_t n = 0; | |
189 | void *p; | |
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) | |
196 | (*lb->errfun)("%s: %s\n", lb->filename, | |
197 | strerror(errno)); | |
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) | |
209 | (*lb->errfun)("%s: skipping incomplete last line\n", | |
210 | lb->filename); | |
211 | return (NULL); | |
212 | } | |
213 | /* Double the buffer if we need more space */ | |
214 | lb->size *= 2; | |
215 | if ((p = realloc(lb->buf, lb->size)) == NULL) { | |
216 | lb->size /= 2; | |
217 | if (lb->errfun) | |
218 | (*lb->errfun)("linebuf (%s): realloc failed\n", | |
219 | lb->filename); | |
220 | return (NULL); | |
221 | } | |
222 | lb->buf = p; | |
223 | } | |
224 | } | |
225 | ||
226 | static int | |
227 | fdlim_get(int hard) | |
228 | { | |
229 | #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE) | |
230 | struct rlimit rlfd; | |
231 | ||
232 | if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) | |
233 | return (-1); | |
234 | if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY) | |
235 | return SSH_SYSFDMAX; | |
236 | else | |
237 | return hard ? rlfd.rlim_max : rlfd.rlim_cur; | |
238 | #else | |
239 | return SSH_SYSFDMAX; | |
240 | #endif | |
241 | } | |
242 | ||
243 | static int | |
244 | fdlim_set(int lim) | |
245 | { | |
246 | #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) | |
247 | struct rlimit rlfd; | |
248 | #endif | |
249 | ||
250 | if (lim <= 0) | |
251 | return (-1); | |
252 | #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) | |
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); | |
258 | #elif defined (HAVE_SETDTABLESIZE) | |
259 | setdtablesize(lim); | |
260 | #endif | |
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 | */ | |
269 | static char * | |
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 | */ | |
291 | static char * | |
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 | ||
302 | static Key * | |
303 | keygrab_ssh1(con *c) | |
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 | } | |
312 | buffer_append(&msg, c->c_data, c->c_plen); | |
313 | buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */ | |
314 | if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) { | |
315 | error("%s: invalid packet type", c->c_name); | |
316 | buffer_clear(&msg); | |
317 | return NULL; | |
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); | |
330 | ||
331 | buffer_clear(&msg); | |
332 | ||
333 | return (rsa); | |
334 | } | |
335 | ||
336 | static int | |
337 | hostjump(Key *hostkey) | |
338 | { | |
339 | kexjmp_key = hostkey; | |
340 | longjmp(kexjmp, 1); | |
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); | |
369 | c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; | |
370 | c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; | |
371 | c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; | |
372 | c->c_kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; | |
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(); | |
385 | ||
386 | return j < 0? NULL : kexjmp_key; | |
387 | } | |
388 | ||
389 | static void | |
390 | keyprint(con *c, Key *key) | |
391 | { | |
392 | char *host = c->c_output_name ? c->c_output_name : c->c_name; | |
393 | ||
394 | if (!key) | |
395 | return; | |
396 | if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL) | |
397 | fatal("host_hash failed"); | |
398 | ||
399 | fprintf(stdout, "%s ", host); | |
400 | key_write(key, stdout); | |
401 | fputs("\n", stdout); | |
402 | } | |
403 | ||
404 | static int | |
405 | tcpconnect(char *host) | |
406 | { | |
407 | struct addrinfo hints, *ai, *aitop; | |
408 | char strport[NI_MAXSERV]; | |
409 | int gaierr, s = -1; | |
410 | ||
411 | snprintf(strport, sizeof strport, "%d", ssh_port); | |
412 | memset(&hints, 0, sizeof(hints)); | |
413 | hints.ai_family = IPv4or6; | |
414 | hints.ai_socktype = SOCK_STREAM; | |
415 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) | |
416 | fatal("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr)); | |
417 | for (ai = aitop; ai; ai = ai->ai_next) { | |
418 | s = socket_rdomain(ai->ai_family, ai->ai_socktype, | |
419 | ai->ai_protocol, scan_rdomain); | |
420 | if (s < 0) { | |
421 | error("socket: %s", strerror(errno)); | |
422 | continue; | |
423 | } | |
424 | if (set_nonblock(s) == -1) | |
425 | fatal("%s: set_nonblock(%d)", __func__, s); | |
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 | ||
438 | static int | |
439 | conalloc(char *iname, char *oname, int keytype) | |
440 | { | |
441 | char *namebase, *name, *namelist; | |
442 | int s; | |
443 | ||
444 | namebase = namelist = xstrdup(iname); | |
445 | ||
446 | do { | |
447 | name = xstrsep(&namelist, ","); | |
448 | if (!name) { | |
449 | xfree(namebase); | |
450 | return (-1); | |
451 | } | |
452 | } while ((s = tcpconnect(name)) < 0); | |
453 | ||
454 | if (s >= maxfd) | |
455 | fatal("conalloc: fdno %d too high", s); | |
456 | if (fdcon[s].c_status) | |
457 | fatal("conalloc: attempt to reuse fdno %d", s); | |
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; | |
468 | fdcon[s].c_keytype = keytype; | |
469 | gettimeofday(&fdcon[s].c_tv, NULL); | |
470 | fdcon[s].c_tv.tv_sec += timeout; | |
471 | TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); | |
472 | FD_SET(s, read_wait); | |
473 | ncon++; | |
474 | return (s); | |
475 | } | |
476 | ||
477 | static void | |
478 | confree(int s) | |
479 | { | |
480 | if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) | |
481 | fatal("confree: attempt to free bad fdno %d", s); | |
482 | close(s); | |
483 | xfree(fdcon[s].c_namebase); | |
484 | xfree(fdcon[s].c_output_name); | |
485 | if (fdcon[s].c_status == CS_KEYS) | |
486 | xfree(fdcon[s].c_data); | |
487 | fdcon[s].c_status = CS_UNUSED; | |
488 | fdcon[s].c_keytype = 0; | |
489 | TAILQ_REMOVE(&tq, &fdcon[s], c_link); | |
490 | FD_CLR(s, read_wait); | |
491 | ncon--; | |
492 | } | |
493 | ||
494 | static void | |
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 | ||
503 | static int | |
504 | conrecycle(int s) | |
505 | { | |
506 | con *c = &fdcon[s]; | |
507 | int ret; | |
508 | ||
509 | ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); | |
510 | confree(s); | |
511 | return (ret); | |
512 | } | |
513 | ||
514 | static void | |
515 | congreet(int s) | |
516 | { | |
517 | int n = 0, remote_major = 0, remote_minor = 0; | |
518 | char buf[256], *cp; | |
519 | char remote_version[sizeof buf]; | |
520 | size_t bufsiz; | |
521 | con *c = &fdcon[s]; | |
522 | ||
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; | |
535 | } | |
536 | if (n == 0) { | |
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 | } | |
547 | conrecycle(s); | |
548 | return; | |
549 | } | |
550 | if (*cp != '\n' && *cp != '\r') { | |
551 | error("%s: bad greeting", c->c_name); | |
552 | confree(s); | |
553 | return; | |
554 | } | |
555 | *cp = '\0'; | |
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; | |
561 | if (c->c_keytype != KT_RSA1) { | |
562 | if (!ssh2_capable(remote_major, remote_minor)) { | |
563 | debug("%s doesn't support ssh2", c->c_name); | |
564 | confree(s); | |
565 | return; | |
566 | } | |
567 | } else if (remote_major != 1) { | |
568 | debug("%s doesn't support ssh1", c->c_name); | |
569 | confree(s); | |
570 | return; | |
571 | } | |
572 | fprintf(stderr, "# %s %s\n", c->c_name, chop(buf)); | |
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); | |
576 | if (n < 0 || (size_t)n >= sizeof(buf)) { | |
577 | error("snprintf: buffer too small"); | |
578 | confree(s); | |
579 | return; | |
580 | } | |
581 | if (atomicio(vwrite, s, buf, n) != (size_t)n) { | |
582 | error("write (%s): %s", c->c_name, strerror(errno)); | |
583 | confree(s); | |
584 | return; | |
585 | } | |
586 | if (c->c_keytype != KT_RSA1) { | |
587 | keyprint(c, keygrab_ssh2(c)); | |
588 | confree(s); | |
589 | return; | |
590 | } | |
591 | c->c_status = CS_SIZE; | |
592 | contouch(s); | |
593 | } | |
594 | ||
595 | static void | |
596 | conread(int s) | |
597 | { | |
598 | con *c = &fdcon[s]; | |
599 | size_t n; | |
600 | ||
601 | if (c->c_status == CS_CON) { | |
602 | congreet(s); | |
603 | return; | |
604 | } | |
605 | n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off); | |
606 | if (n == 0) { | |
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: | |
623 | keyprint(c, keygrab_ssh1(c)); | |
624 | confree(s); | |
625 | return; | |
626 | default: | |
627 | fatal("conread: invalid status %d", c->c_status); | |
628 | break; | |
629 | } | |
630 | ||
631 | contouch(s); | |
632 | } | |
633 | ||
634 | static void | |
635 | conloop(void) | |
636 | { | |
637 | struct timeval seltime, now; | |
638 | fd_set *r, *e; | |
639 | con *c; | |
640 | int i; | |
641 | ||
642 | gettimeofday(&now, NULL); | |
643 | c = TAILQ_FIRST(&tq); | |
644 | ||
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))) { | |
647 | seltime = c->c_tv; | |
648 | seltime.tv_sec -= now.tv_sec; | |
649 | seltime.tv_usec -= now.tv_usec; | |
650 | if (seltime.tv_usec < 0) { | |
651 | seltime.tv_usec += 1000000; | |
652 | seltime.tv_sec--; | |
653 | } | |
654 | } else | |
655 | seltime.tv_sec = seltime.tv_usec = 0; | |
656 | ||
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)); | |
661 | ||
662 | while (select(maxfd, r, NULL, e, &seltime) == -1 && | |
663 | (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) | |
664 | ; | |
665 | ||
666 | for (i = 0; i < maxfd; i++) { | |
667 | if (FD_ISSET(i, e)) { | |
668 | error("%s: exception!", fdcon[i].c_name); | |
669 | confree(i); | |
670 | } else if (FD_ISSET(i, r)) | |
671 | conread(i); | |
672 | } | |
673 | xfree(r); | |
674 | xfree(e); | |
675 | ||
676 | c = TAILQ_FIRST(&tq); | |
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))) { | |
679 | int s = c->c_fd; | |
680 | ||
681 | c = TAILQ_NEXT(c, c_link); | |
682 | conrecycle(s); | |
683 | } | |
684 | } | |
685 | ||
686 | static void | |
687 | do_host(char *host) | |
688 | { | |
689 | char *name = strnnsep(&host, " \t\n"); | |
690 | int j; | |
691 | ||
692 | if (name == NULL) | |
693 | return; | |
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); | |
699 | } | |
700 | } | |
701 | } | |
702 | ||
703 | void | |
704 | fatal(const char *fmt,...) | |
705 | { | |
706 | va_list args; | |
707 | ||
708 | va_start(args, fmt); | |
709 | do_log(SYSLOG_LEVEL_FATAL, fmt, args); | |
710 | va_end(args); | |
711 | if (nonfatal_fatal) | |
712 | longjmp(kexjmp, -1); | |
713 | else | |
714 | exit(255); | |
715 | } | |
716 | ||
717 | static void | |
718 | usage(void) | |
719 | { | |
720 | fprintf(stderr, | |
721 | "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n" | |
722 | "\t\t [-V rdomain] [host | addrlist namelist] ...\n", | |
723 | __progname); | |
724 | exit(1); | |
725 | } | |
726 | ||
727 | int | |
728 | main(int argc, char **argv) | |
729 | { | |
730 | int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; | |
731 | int opt, fopt_count = 0; | |
732 | char *tname; | |
733 | ||
734 | extern int optind; | |
735 | extern char *optarg; | |
736 | ||
737 | __progname = ssh_get_progname(argv[0]); | |
738 | init_rng(); | |
739 | seed_rng(); | |
740 | TAILQ_INIT(&tq); | |
741 | ||
742 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ | |
743 | sanitise_stdfd(); | |
744 | ||
745 | if (argc <= 1) | |
746 | usage(); | |
747 | ||
748 | while ((opt = getopt(argc, argv, "Hv46p:T:t:f:V:")) != -1) { | |
749 | switch (opt) { | |
750 | case 'H': | |
751 | hash_hosts = 1; | |
752 | break; | |
753 | case 'p': | |
754 | ssh_port = a2port(optarg); | |
755 | if (ssh_port <= 0) { | |
756 | fprintf(stderr, "Bad port '%s'\n", optarg); | |
757 | exit(1); | |
758 | } | |
759 | break; | |
760 | case 'T': | |
761 | timeout = convtime(optarg); | |
762 | if (timeout == -1 || timeout == 0) { | |
763 | fprintf(stderr, "Bad timeout '%s'\n", optarg); | |
764 | usage(); | |
765 | } | |
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; | |
777 | case 'f': | |
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: | |
798 | fatal("unknown key type %s", tname); | |
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; | |
809 | case 'V': | |
810 | #ifdef USE_ROUTINGDOMAIN | |
811 | scan_rdomain = a2rdomain(optarg); | |
812 | if (scan_rdomain == -1) { | |
813 | fprintf(stderr, "Bad rdomain '%s'\n", optarg); | |
814 | exit(1); | |
815 | } | |
816 | #else | |
817 | fprintf(stderr, "RoutingDomain not supported on this " | |
818 | "platform.\n"); | |
819 | exit(1); | |
820 | #endif | |
821 | break; | |
822 | case '?': | |
823 | default: | |
824 | usage(); | |
825 | } | |
826 | } | |
827 | if (optind == argc && !fopt_count) | |
828 | usage(); | |
829 | ||
830 | log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); | |
831 | ||
832 | maxfd = fdlim_get(1); | |
833 | if (maxfd < 0) | |
834 | fatal("%s: fdlim_get: bad value", __progname); | |
835 | if (maxfd > MAXMAXFD) | |
836 | maxfd = MAXMAXFD; | |
837 | if (MAXCON <= 0) | |
838 | fatal("%s: not enough file descriptors", __progname); | |
839 | if (maxfd > fdlim_get(0)) | |
840 | fdlim_set(maxfd); | |
841 | fdcon = xcalloc(maxfd, sizeof(con)); | |
842 | ||
843 | read_wait_nfdset = howmany(maxfd, NFDBITS); | |
844 | read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask)); | |
845 | ||
846 | if (fopt_count) { | |
847 | Linebuf *lb; | |
848 | char *line; | |
849 | int j; | |
850 | ||
851 | for (j = 0; j < fopt_count; j++) { | |
852 | lb = Linebuf_alloc(argv[j], error); | |
853 | if (!lb) | |
854 | continue; | |
855 | while ((line = Linebuf_getline(lb)) != NULL) | |
856 | do_host(line); | |
857 | Linebuf_free(lb); | |
858 | } | |
859 | } | |
860 | ||
861 | while (optind < argc) | |
862 | do_host(argv[optind++]); | |
863 | ||
864 | while (ncon > 0) | |
865 | conloop(); | |
866 | ||
867 | return (0); | |
868 | } |