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c8dfff33 | 1 | /* $OpenBSD: ssh-keyscan.c,v 1.67 2006/07/12 22:28:52 stevesk Exp $ */ |
f6fdbddf | 2 | /* |
3 | * Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>. | |
4 | * | |
5 | * Modification and redistribution in source and binary forms is | |
6 | * permitted provided that due credit is given to the author and the | |
aa144206 | 7 | * OpenBSD project by leaving this copyright notice intact. |
f6fdbddf | 8 | */ |
9 | ||
10 | #include "includes.h" | |
876faccd | 11 | |
9fd2a215 | 12 | #include "openbsd-compat/sys-queue.h" |
876faccd | 13 | #include <sys/resource.h> |
c8dfff33 | 14 | #if defined(HAVE_NETDB_H) |
15 | # include <netdb.h> | |
16 | #endif | |
403a29ac | 17 | #include <errno.h> |
4c72fcfd | 18 | #include <stdarg.h> |
c8dfff33 | 19 | #include <setjmp.h> |
f6fdbddf | 20 | |
21 | #include <openssl/bn.h> | |
f6fdbddf | 22 | |
23 | #include "xmalloc.h" | |
24 | #include "ssh.h" | |
42f11eb2 | 25 | #include "ssh1.h" |
f6fdbddf | 26 | #include "key.h" |
5061072f | 27 | #include "kex.h" |
28 | #include "compat.h" | |
29 | #include "myproposal.h" | |
30 | #include "packet.h" | |
31 | #include "dispatch.h" | |
f6fdbddf | 32 | #include "buffer.h" |
33 | #include "bufaux.h" | |
42f11eb2 | 34 | #include "log.h" |
2671b47f | 35 | #include "atomicio.h" |
5061072f | 36 | #include "misc.h" |
90a8ae9f | 37 | #include "hostfile.h" |
f6fdbddf | 38 | |
5061072f | 39 | /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. |
40 | Default value is AF_UNSPEC means both IPv4 and IPv6. */ | |
5061072f | 41 | int IPv4or6 = AF_UNSPEC; |
f6fdbddf | 42 | |
5061072f | 43 | int ssh_port = SSH_DEFAULT_PORT; |
a204806b | 44 | |
45 | #define KT_RSA1 1 | |
46 | #define KT_DSA 2 | |
47 | #define KT_RSA 4 | |
48 | ||
49 | int get_keytypes = KT_RSA1; /* Get only RSA1 keys by default */ | |
f6fdbddf | 50 | |
90a8ae9f | 51 | int hash_hosts = 0; /* Hash hostname on output */ |
52 | ||
f6fdbddf | 53 | #define MAXMAXFD 256 |
54 | ||
55 | /* The number of seconds after which to give up on a TCP connection */ | |
56 | int timeout = 5; | |
57 | ||
58 | int maxfd; | |
2671b47f | 59 | #define MAXCON (maxfd - 10) |
f6fdbddf | 60 | |
1fe6a48f | 61 | extern char *__progname; |
ff7fee59 | 62 | fd_set *read_wait; |
52e3daed | 63 | size_t read_wait_nfdset; |
f6fdbddf | 64 | int ncon; |
5061072f | 65 | int nonfatal_fatal = 0; |
66 | jmp_buf kexjmp; | |
4278ff63 | 67 | Key *kexjmp_key; |
f6fdbddf | 68 | |
69 | /* | |
70 | * Keep a connection structure for each file descriptor. The state | |
71 | * associated with file descriptor n is held in fdcon[n]. | |
72 | */ | |
73 | typedef struct Connection { | |
1e3b8b07 | 74 | u_char c_status; /* State of connection on this file desc. */ |
f6fdbddf | 75 | #define CS_UNUSED 0 /* File descriptor unused */ |
76 | #define CS_CON 1 /* Waiting to connect/read greeting */ | |
77 | #define CS_SIZE 2 /* Waiting to read initial packet size */ | |
78 | #define CS_KEYS 3 /* Waiting to read public key packet */ | |
79 | int c_fd; /* Quick lookup: c->c_fd == c - fdcon */ | |
80 | int c_plen; /* Packet length field for ssh packet */ | |
81 | int c_len; /* Total bytes which must be read. */ | |
82 | int c_off; /* Length of data read so far. */ | |
5061072f | 83 | int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */ |
f6fdbddf | 84 | char *c_namebase; /* Address to free for c_name and c_namelist */ |
85 | char *c_name; /* Hostname of connection for errors */ | |
86 | char *c_namelist; /* Pointer to other possible addresses */ | |
87 | char *c_output_name; /* Hostname of connection for output */ | |
88 | char *c_data; /* Data read from this fd */ | |
5061072f | 89 | Kex *c_kex; /* The key-exchange struct for ssh2 */ |
f6fdbddf | 90 | struct timeval c_tv; /* Time at which connection gets aborted */ |
91 | TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */ | |
92 | } con; | |
93 | ||
94 | TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */ | |
95 | con *fdcon; | |
96 | ||
97 | /* | |
98 | * This is just a wrapper around fgets() to make it usable. | |
99 | */ | |
100 | ||
101 | /* Stress-test. Increase this later. */ | |
102 | #define LINEBUF_SIZE 16 | |
103 | ||
104 | typedef struct { | |
105 | char *buf; | |
1e3b8b07 | 106 | u_int size; |
f6fdbddf | 107 | int lineno; |
108 | const char *filename; | |
109 | FILE *stream; | |
110 | void (*errfun) (const char *,...); | |
111 | } Linebuf; | |
112 | ||
396c147e | 113 | static Linebuf * |
f6fdbddf | 114 | Linebuf_alloc(const char *filename, void (*errfun) (const char *,...)) |
115 | { | |
116 | Linebuf *lb; | |
117 | ||
118 | if (!(lb = malloc(sizeof(*lb)))) { | |
119 | if (errfun) | |
f11fe301 | 120 | (*errfun) ("linebuf (%s): malloc failed\n", |
121 | filename ? filename : "(stdin)"); | |
f6fdbddf | 122 | return (NULL); |
123 | } | |
124 | if (filename) { | |
125 | lb->filename = filename; | |
126 | if (!(lb->stream = fopen(filename, "r"))) { | |
b5c334cc | 127 | xfree(lb); |
f6fdbddf | 128 | if (errfun) |
129 | (*errfun) ("%s: %s\n", filename, strerror(errno)); | |
130 | return (NULL); | |
131 | } | |
132 | } else { | |
133 | lb->filename = "(stdin)"; | |
134 | lb->stream = stdin; | |
135 | } | |
136 | ||
6e56dc92 | 137 | if (!(lb->buf = malloc((lb->size = LINEBUF_SIZE)))) { |
f6fdbddf | 138 | if (errfun) |
139 | (*errfun) ("linebuf (%s): malloc failed\n", lb->filename); | |
b5c334cc | 140 | xfree(lb); |
f6fdbddf | 141 | return (NULL); |
142 | } | |
143 | lb->errfun = errfun; | |
144 | lb->lineno = 0; | |
145 | return (lb); | |
146 | } | |
147 | ||
396c147e | 148 | static void |
f6fdbddf | 149 | Linebuf_free(Linebuf * lb) |
150 | { | |
151 | fclose(lb->stream); | |
b5c334cc | 152 | xfree(lb->buf); |
153 | xfree(lb); | |
f6fdbddf | 154 | } |
155 | ||
396c147e | 156 | #if 0 |
157 | static void | |
f6fdbddf | 158 | Linebuf_restart(Linebuf * lb) |
159 | { | |
160 | clearerr(lb->stream); | |
161 | rewind(lb->stream); | |
162 | lb->lineno = 0; | |
163 | } | |
164 | ||
396c147e | 165 | static int |
f6fdbddf | 166 | Linebuf_lineno(Linebuf * lb) |
167 | { | |
168 | return (lb->lineno); | |
169 | } | |
396c147e | 170 | #endif |
f6fdbddf | 171 | |
396c147e | 172 | static char * |
5be2ec5e | 173 | Linebuf_getline(Linebuf * lb) |
f6fdbddf | 174 | { |
2ceb8101 | 175 | size_t n = 0; |
50d2fbbc | 176 | void *p; |
f6fdbddf | 177 | |
178 | lb->lineno++; | |
179 | for (;;) { | |
180 | /* Read a line */ | |
181 | if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) { | |
182 | if (ferror(lb->stream) && lb->errfun) | |
50d2fbbc | 183 | (*lb->errfun)("%s: %s\n", lb->filename, |
778f6940 | 184 | strerror(errno)); |
f6fdbddf | 185 | return (NULL); |
186 | } | |
187 | n = strlen(lb->buf); | |
188 | ||
189 | /* Return it or an error if it fits */ | |
190 | if (n > 0 && lb->buf[n - 1] == '\n') { | |
191 | lb->buf[n - 1] = '\0'; | |
192 | return (lb->buf); | |
193 | } | |
194 | if (n != lb->size - 1) { | |
195 | if (lb->errfun) | |
50d2fbbc | 196 | (*lb->errfun)("%s: skipping incomplete last line\n", |
778f6940 | 197 | lb->filename); |
f6fdbddf | 198 | return (NULL); |
199 | } | |
200 | /* Double the buffer if we need more space */ | |
50d2fbbc | 201 | lb->size *= 2; |
202 | if ((p = realloc(lb->buf, lb->size)) == NULL) { | |
203 | lb->size /= 2; | |
f6fdbddf | 204 | if (lb->errfun) |
50d2fbbc | 205 | (*lb->errfun)("linebuf (%s): realloc failed\n", |
778f6940 | 206 | lb->filename); |
f6fdbddf | 207 | return (NULL); |
208 | } | |
50d2fbbc | 209 | lb->buf = p; |
f6fdbddf | 210 | } |
211 | } | |
212 | ||
396c147e | 213 | static int |
f6fdbddf | 214 | fdlim_get(int hard) |
215 | { | |
f318b98b | 216 | #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE) |
f6fdbddf | 217 | struct rlimit rlfd; |
778f6940 | 218 | |
f6fdbddf | 219 | if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) |
220 | return (-1); | |
221 | if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY) | |
341c3efe | 222 | return SSH_SYSFDMAX; |
f6fdbddf | 223 | else |
224 | return hard ? rlfd.rlim_max : rlfd.rlim_cur; | |
b03bd394 | 225 | #else |
341c3efe | 226 | return SSH_SYSFDMAX; |
b03bd394 | 227 | #endif |
f6fdbddf | 228 | } |
229 | ||
396c147e | 230 | static int |
f6fdbddf | 231 | fdlim_set(int lim) |
232 | { | |
f318b98b | 233 | #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) |
f6fdbddf | 234 | struct rlimit rlfd; |
b03bd394 | 235 | #endif |
41545cb6 | 236 | |
f6fdbddf | 237 | if (lim <= 0) |
238 | return (-1); | |
f318b98b | 239 | #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) |
f6fdbddf | 240 | if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) |
241 | return (-1); | |
242 | rlfd.rlim_cur = lim; | |
243 | if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0) | |
244 | return (-1); | |
b03bd394 | 245 | #elif defined (HAVE_SETDTABLESIZE) |
b705bea0 | 246 | setdtablesize(lim); |
b03bd394 | 247 | #endif |
f6fdbddf | 248 | return (0); |
249 | } | |
250 | ||
251 | /* | |
252 | * This is an strsep function that returns a null field for adjacent | |
253 | * separators. This is the same as the 4.4BSD strsep, but different from the | |
254 | * one in the GNU libc. | |
255 | */ | |
396c147e | 256 | static char * |
f6fdbddf | 257 | xstrsep(char **str, const char *delim) |
258 | { | |
259 | char *s, *e; | |
260 | ||
261 | if (!**str) | |
262 | return (NULL); | |
263 | ||
264 | s = *str; | |
265 | e = s + strcspn(s, delim); | |
266 | ||
267 | if (*e != '\0') | |
268 | *e++ = '\0'; | |
269 | *str = e; | |
270 | ||
271 | return (s); | |
272 | } | |
273 | ||
274 | /* | |
275 | * Get the next non-null token (like GNU strsep). Strsep() will return a | |
276 | * null token for two adjacent separators, so we may have to loop. | |
277 | */ | |
396c147e | 278 | static char * |
f6fdbddf | 279 | strnnsep(char **stringp, char *delim) |
280 | { | |
281 | char *tok; | |
282 | ||
283 | do { | |
284 | tok = xstrsep(stringp, delim); | |
285 | } while (tok && *tok == '\0'); | |
286 | return (tok); | |
287 | } | |
288 | ||
5061072f | 289 | static Key * |
290 | keygrab_ssh1(con *c) | |
f6fdbddf | 291 | { |
292 | static Key *rsa; | |
293 | static Buffer msg; | |
294 | ||
295 | if (rsa == NULL) { | |
296 | buffer_init(&msg); | |
297 | rsa = key_new(KEY_RSA1); | |
298 | } | |
5061072f | 299 | buffer_append(&msg, c->c_data, c->c_plen); |
300 | buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */ | |
f6fdbddf | 301 | if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) { |
5061072f | 302 | error("%s: invalid packet type", c->c_name); |
f6fdbddf | 303 | buffer_clear(&msg); |
5061072f | 304 | return NULL; |
f6fdbddf | 305 | } |
306 | buffer_consume(&msg, 8); /* cookie */ | |
307 | ||
308 | /* server key */ | |
309 | (void) buffer_get_int(&msg); | |
310 | buffer_get_bignum(&msg, rsa->rsa->e); | |
311 | buffer_get_bignum(&msg, rsa->rsa->n); | |
312 | ||
313 | /* host key */ | |
314 | (void) buffer_get_int(&msg); | |
315 | buffer_get_bignum(&msg, rsa->rsa->e); | |
316 | buffer_get_bignum(&msg, rsa->rsa->n); | |
5061072f | 317 | |
f6fdbddf | 318 | buffer_clear(&msg); |
319 | ||
5061072f | 320 | return (rsa); |
321 | } | |
322 | ||
323 | static int | |
324 | hostjump(Key *hostkey) | |
325 | { | |
4278ff63 | 326 | kexjmp_key = hostkey; |
327 | longjmp(kexjmp, 1); | |
5061072f | 328 | } |
329 | ||
330 | static int | |
331 | ssh2_capable(int remote_major, int remote_minor) | |
332 | { | |
333 | switch (remote_major) { | |
334 | case 1: | |
335 | if (remote_minor == 99) | |
336 | return 1; | |
337 | break; | |
338 | case 2: | |
339 | return 1; | |
340 | default: | |
341 | break; | |
342 | } | |
343 | return 0; | |
344 | } | |
345 | ||
346 | static Key * | |
347 | keygrab_ssh2(con *c) | |
348 | { | |
349 | int j; | |
350 | ||
351 | packet_set_connection(c->c_fd, c->c_fd); | |
352 | enable_compat20(); | |
353 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA? | |
354 | "ssh-dss": "ssh-rsa"; | |
355 | c->c_kex = kex_setup(myproposal); | |
98a58eda | 356 | c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
41e5bd9a | 357 | c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; |
98a58eda | 358 | c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; |
2ff8003a | 359 | c->c_kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; |
5061072f | 360 | c->c_kex->verify_host_key = hostjump; |
361 | ||
362 | if (!(j = setjmp(kexjmp))) { | |
363 | nonfatal_fatal = 1; | |
364 | dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex); | |
365 | fprintf(stderr, "Impossible! dispatch_run() returned!\n"); | |
366 | exit(1); | |
367 | } | |
368 | nonfatal_fatal = 0; | |
369 | xfree(c->c_kex); | |
370 | c->c_kex = NULL; | |
371 | packet_close(); | |
5061072f | 372 | |
4278ff63 | 373 | return j < 0? NULL : kexjmp_key; |
5061072f | 374 | } |
375 | ||
376 | static void | |
377 | keyprint(con *c, Key *key) | |
378 | { | |
90a8ae9f | 379 | char *host = c->c_output_name ? c->c_output_name : c->c_name; |
380 | ||
5061072f | 381 | if (!key) |
382 | return; | |
90a8ae9f | 383 | if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL) |
384 | fatal("host_hash failed"); | |
5061072f | 385 | |
90a8ae9f | 386 | fprintf(stdout, "%s ", host); |
5061072f | 387 | key_write(key, stdout); |
f6fdbddf | 388 | fputs("\n", stdout); |
389 | } | |
390 | ||
396c147e | 391 | static int |
f6fdbddf | 392 | tcpconnect(char *host) |
393 | { | |
394 | struct addrinfo hints, *ai, *aitop; | |
395 | char strport[NI_MAXSERV]; | |
396 | int gaierr, s = -1; | |
397 | ||
5061072f | 398 | snprintf(strport, sizeof strport, "%d", ssh_port); |
f6fdbddf | 399 | memset(&hints, 0, sizeof(hints)); |
5061072f | 400 | hints.ai_family = IPv4or6; |
f6fdbddf | 401 | hints.ai_socktype = SOCK_STREAM; |
402 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) | |
403 | fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr)); | |
404 | for (ai = aitop; ai; ai = ai->ai_next) { | |
3e131a6d | 405 | s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
f6fdbddf | 406 | if (s < 0) { |
407 | error("socket: %s", strerror(errno)); | |
408 | continue; | |
409 | } | |
170694d7 | 410 | if (set_nonblock(s) == -1) |
411 | fatal("%s: set_nonblock(%d)", __func__, s); | |
f6fdbddf | 412 | if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 && |
413 | errno != EINPROGRESS) | |
414 | error("connect (`%s'): %s", host, strerror(errno)); | |
415 | else | |
416 | break; | |
417 | close(s); | |
418 | s = -1; | |
419 | } | |
420 | freeaddrinfo(aitop); | |
421 | return s; | |
422 | } | |
423 | ||
396c147e | 424 | static int |
5061072f | 425 | conalloc(char *iname, char *oname, int keytype) |
f6fdbddf | 426 | { |
f6fdbddf | 427 | char *namebase, *name, *namelist; |
50d2fbbc | 428 | int s; |
f6fdbddf | 429 | |
430 | namebase = namelist = xstrdup(iname); | |
431 | ||
432 | do { | |
433 | name = xstrsep(&namelist, ","); | |
434 | if (!name) { | |
b5c334cc | 435 | xfree(namebase); |
f6fdbddf | 436 | return (-1); |
437 | } | |
438 | } while ((s = tcpconnect(name)) < 0); | |
439 | ||
440 | if (s >= maxfd) | |
227e8e86 | 441 | fatal("conalloc: fdno %d too high", s); |
f6fdbddf | 442 | if (fdcon[s].c_status) |
227e8e86 | 443 | fatal("conalloc: attempt to reuse fdno %d", s); |
f6fdbddf | 444 | |
445 | fdcon[s].c_fd = s; | |
446 | fdcon[s].c_status = CS_CON; | |
447 | fdcon[s].c_namebase = namebase; | |
448 | fdcon[s].c_name = name; | |
449 | fdcon[s].c_namelist = namelist; | |
450 | fdcon[s].c_output_name = xstrdup(oname); | |
451 | fdcon[s].c_data = (char *) &fdcon[s].c_plen; | |
452 | fdcon[s].c_len = 4; | |
453 | fdcon[s].c_off = 0; | |
5061072f | 454 | fdcon[s].c_keytype = keytype; |
f6fdbddf | 455 | gettimeofday(&fdcon[s].c_tv, NULL); |
456 | fdcon[s].c_tv.tv_sec += timeout; | |
457 | TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); | |
ff7fee59 | 458 | FD_SET(s, read_wait); |
f6fdbddf | 459 | ncon++; |
460 | return (s); | |
461 | } | |
462 | ||
396c147e | 463 | static void |
f6fdbddf | 464 | confree(int s) |
465 | { | |
f6fdbddf | 466 | if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) |
227e8e86 | 467 | fatal("confree: attempt to free bad fdno %d", s); |
2671b47f | 468 | close(s); |
b5c334cc | 469 | xfree(fdcon[s].c_namebase); |
470 | xfree(fdcon[s].c_output_name); | |
f6fdbddf | 471 | if (fdcon[s].c_status == CS_KEYS) |
b5c334cc | 472 | xfree(fdcon[s].c_data); |
f6fdbddf | 473 | fdcon[s].c_status = CS_UNUSED; |
5061072f | 474 | fdcon[s].c_keytype = 0; |
f6fdbddf | 475 | TAILQ_REMOVE(&tq, &fdcon[s], c_link); |
ff7fee59 | 476 | FD_CLR(s, read_wait); |
f6fdbddf | 477 | ncon--; |
478 | } | |
479 | ||
396c147e | 480 | static void |
f6fdbddf | 481 | contouch(int s) |
482 | { | |
483 | TAILQ_REMOVE(&tq, &fdcon[s], c_link); | |
484 | gettimeofday(&fdcon[s].c_tv, NULL); | |
485 | fdcon[s].c_tv.tv_sec += timeout; | |
486 | TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); | |
487 | } | |
488 | ||
396c147e | 489 | static int |
f6fdbddf | 490 | conrecycle(int s) |
491 | { | |
f6fdbddf | 492 | con *c = &fdcon[s]; |
50d2fbbc | 493 | int ret; |
f6fdbddf | 494 | |
5061072f | 495 | ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); |
f6fdbddf | 496 | confree(s); |
f6fdbddf | 497 | return (ret); |
498 | } | |
499 | ||
396c147e | 500 | static void |
f6fdbddf | 501 | congreet(int s) |
502 | { | |
2ceb8101 | 503 | int n = 0, remote_major = 0, remote_minor = 0; |
5061072f | 504 | char buf[256], *cp; |
cdc95d6e | 505 | char remote_version[sizeof buf]; |
2ceb8101 | 506 | size_t bufsiz; |
f6fdbddf | 507 | con *c = &fdcon[s]; |
508 | ||
2995db03 | 509 | for (;;) { |
510 | memset(buf, '\0', sizeof(buf)); | |
511 | bufsiz = sizeof(buf); | |
512 | cp = buf; | |
513 | while (bufsiz-- && | |
514 | (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') { | |
515 | if (*cp == '\r') | |
516 | *cp = '\n'; | |
517 | cp++; | |
518 | } | |
519 | if (n != 1 || strncmp(buf, "SSH-", 4) == 0) | |
520 | break; | |
578954b1 | 521 | } |
27452401 | 522 | if (n == 0) { |
05624c18 | 523 | switch (errno) { |
524 | case EPIPE: | |
525 | error("%s: Connection closed by remote host", c->c_name); | |
526 | break; | |
527 | case ECONNREFUSED: | |
528 | break; | |
529 | default: | |
530 | error("read (%s): %s", c->c_name, strerror(errno)); | |
531 | break; | |
532 | } | |
27452401 | 533 | conrecycle(s); |
534 | return; | |
535 | } | |
c16c7f20 | 536 | if (*cp != '\n' && *cp != '\r') { |
f6fdbddf | 537 | error("%s: bad greeting", c->c_name); |
538 | confree(s); | |
539 | return; | |
540 | } | |
c16c7f20 | 541 | *cp = '\0'; |
cdc95d6e | 542 | if (sscanf(buf, "SSH-%d.%d-%[^\n]\n", |
543 | &remote_major, &remote_minor, remote_version) == 3) | |
544 | compat_datafellows(remote_version); | |
545 | else | |
546 | datafellows = 0; | |
5061072f | 547 | if (c->c_keytype != KT_RSA1) { |
5061072f | 548 | if (!ssh2_capable(remote_major, remote_minor)) { |
549 | debug("%s doesn't support ssh2", c->c_name); | |
550 | confree(s); | |
551 | return; | |
552 | } | |
cdc95d6e | 553 | } else if (remote_major != 1) { |
554 | debug("%s doesn't support ssh1", c->c_name); | |
555 | confree(s); | |
556 | return; | |
5061072f | 557 | } |
578954b1 | 558 | fprintf(stderr, "# %s %s\n", c->c_name, chop(buf)); |
5061072f | 559 | n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", |
560 | c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2, | |
561 | c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2); | |
2ceb8101 | 562 | if (n < 0 || (size_t)n >= sizeof(buf)) { |
4b826d75 | 563 | error("snprintf: buffer too small"); |
564 | confree(s); | |
565 | return; | |
566 | } | |
2ceb8101 | 567 | if (atomicio(vwrite, s, buf, n) != (size_t)n) { |
f6fdbddf | 568 | error("write (%s): %s", c->c_name, strerror(errno)); |
569 | confree(s); | |
570 | return; | |
571 | } | |
5061072f | 572 | if (c->c_keytype != KT_RSA1) { |
573 | keyprint(c, keygrab_ssh2(c)); | |
574 | confree(s); | |
575 | return; | |
576 | } | |
f6fdbddf | 577 | c->c_status = CS_SIZE; |
578 | contouch(s); | |
579 | } | |
580 | ||
396c147e | 581 | static void |
f6fdbddf | 582 | conread(int s) |
583 | { | |
f6fdbddf | 584 | con *c = &fdcon[s]; |
05624c18 | 585 | size_t n; |
f6fdbddf | 586 | |
587 | if (c->c_status == CS_CON) { | |
588 | congreet(s); | |
589 | return; | |
590 | } | |
f581b6e8 | 591 | n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off); |
05624c18 | 592 | if (n == 0) { |
f6fdbddf | 593 | error("read (%s): %s", c->c_name, strerror(errno)); |
594 | confree(s); | |
595 | return; | |
596 | } | |
597 | c->c_off += n; | |
598 | ||
599 | if (c->c_off == c->c_len) | |
600 | switch (c->c_status) { | |
601 | case CS_SIZE: | |
602 | c->c_plen = htonl(c->c_plen); | |
603 | c->c_len = c->c_plen + 8 - (c->c_plen & 7); | |
604 | c->c_off = 0; | |
605 | c->c_data = xmalloc(c->c_len); | |
606 | c->c_status = CS_KEYS; | |
607 | break; | |
608 | case CS_KEYS: | |
5061072f | 609 | keyprint(c, keygrab_ssh1(c)); |
f6fdbddf | 610 | confree(s); |
611 | return; | |
f6fdbddf | 612 | default: |
227e8e86 | 613 | fatal("conread: invalid status %d", c->c_status); |
f6fdbddf | 614 | break; |
615 | } | |
616 | ||
617 | contouch(s); | |
618 | } | |
619 | ||
396c147e | 620 | static void |
f6fdbddf | 621 | conloop(void) |
622 | { | |
f6fdbddf | 623 | struct timeval seltime, now; |
50d2fbbc | 624 | fd_set *r, *e; |
f6fdbddf | 625 | con *c; |
50d2fbbc | 626 | int i; |
f6fdbddf | 627 | |
628 | gettimeofday(&now, NULL); | |
48ba8dc8 | 629 | c = TAILQ_FIRST(&tq); |
f6fdbddf | 630 | |
2671b47f | 631 | if (c && (c->c_tv.tv_sec > now.tv_sec || |
632 | (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) { | |
f6fdbddf | 633 | seltime = c->c_tv; |
634 | seltime.tv_sec -= now.tv_sec; | |
635 | seltime.tv_usec -= now.tv_usec; | |
5be2ec5e | 636 | if (seltime.tv_usec < 0) { |
f6fdbddf | 637 | seltime.tv_usec += 1000000; |
638 | seltime.tv_sec--; | |
639 | } | |
640 | } else | |
641 | seltime.tv_sec = seltime.tv_usec = 0; | |
642 | ||
52e3daed | 643 | r = xcalloc(read_wait_nfdset, sizeof(fd_mask)); |
644 | e = xcalloc(read_wait_nfdset, sizeof(fd_mask)); | |
645 | memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask)); | |
646 | memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask)); | |
ff7fee59 | 647 | |
648 | while (select(maxfd, r, NULL, e, &seltime) == -1 && | |
fd193ca4 | 649 | (errno == EAGAIN || errno == EINTR)) |
650 | ; | |
651 | ||
2671b47f | 652 | for (i = 0; i < maxfd; i++) { |
ff7fee59 | 653 | if (FD_ISSET(i, e)) { |
f6fdbddf | 654 | error("%s: exception!", fdcon[i].c_name); |
655 | confree(i); | |
ff7fee59 | 656 | } else if (FD_ISSET(i, r)) |
f6fdbddf | 657 | conread(i); |
2671b47f | 658 | } |
ff7fee59 | 659 | xfree(r); |
660 | xfree(e); | |
f6fdbddf | 661 | |
48ba8dc8 | 662 | c = TAILQ_FIRST(&tq); |
2671b47f | 663 | while (c && (c->c_tv.tv_sec < now.tv_sec || |
664 | (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) { | |
f6fdbddf | 665 | int s = c->c_fd; |
2671b47f | 666 | |
48ba8dc8 | 667 | c = TAILQ_NEXT(c, c_link); |
f6fdbddf | 668 | conrecycle(s); |
669 | } | |
670 | } | |
671 | ||
5061072f | 672 | static void |
673 | do_host(char *host) | |
f6fdbddf | 674 | { |
5061072f | 675 | char *name = strnnsep(&host, " \t\n"); |
676 | int j; | |
677 | ||
0408c978 | 678 | if (name == NULL) |
679 | return; | |
5061072f | 680 | for (j = KT_RSA1; j <= KT_RSA; j *= 2) { |
681 | if (get_keytypes & j) { | |
682 | while (ncon >= MAXCON) | |
683 | conloop(); | |
684 | conalloc(name, *host ? host : name, j); | |
f6fdbddf | 685 | } |
686 | } | |
687 | } | |
688 | ||
2bae80e9 | 689 | void |
690 | fatal(const char *fmt,...) | |
5061072f | 691 | { |
2bae80e9 | 692 | va_list args; |
50d2fbbc | 693 | |
2bae80e9 | 694 | va_start(args, fmt); |
695 | do_log(SYSLOG_LEVEL_FATAL, fmt, args); | |
696 | va_end(args); | |
5061072f | 697 | if (nonfatal_fatal) |
698 | longjmp(kexjmp, -1); | |
2bae80e9 | 699 | else |
eec6d341 | 700 | exit(255); |
5061072f | 701 | } |
702 | ||
396c147e | 703 | static void |
f6fdbddf | 704 | usage(void) |
705 | { | |
3bafbaa7 | 706 | fprintf(stderr, "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n" |
50d2fbbc | 707 | "\t\t [host | addrlist namelist] [...]\n", |
33e766d2 | 708 | __progname); |
33e766d2 | 709 | exit(1); |
f6fdbddf | 710 | } |
711 | ||
712 | int | |
713 | main(int argc, char **argv) | |
714 | { | |
5061072f | 715 | int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; |
716 | int opt, fopt_count = 0; | |
717 | char *tname; | |
a204806b | 718 | |
5061072f | 719 | extern int optind; |
720 | extern char *optarg; | |
f6fdbddf | 721 | |
fda04d7d | 722 | __progname = ssh_get_progname(argv[0]); |
8782141f | 723 | init_rng(); |
724 | seed_rng(); | |
f6fdbddf | 725 | TAILQ_INIT(&tq); |
726 | ||
fd6168c1 | 727 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
728 | sanitise_stdfd(); | |
729 | ||
5061072f | 730 | if (argc <= 1) |
f6fdbddf | 731 | usage(); |
732 | ||
90a8ae9f | 733 | while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) { |
5061072f | 734 | switch (opt) { |
90a8ae9f | 735 | case 'H': |
736 | hash_hosts = 1; | |
737 | break; | |
5061072f | 738 | case 'p': |
739 | ssh_port = a2port(optarg); | |
740 | if (ssh_port == 0) { | |
741 | fprintf(stderr, "Bad port '%s'\n", optarg); | |
742 | exit(1); | |
743 | } | |
744 | break; | |
745 | case 'T': | |
c8f94200 | 746 | timeout = convtime(optarg); |
747 | if (timeout == -1 || timeout == 0) { | |
748 | fprintf(stderr, "Bad timeout '%s'\n", optarg); | |
f6fdbddf | 749 | usage(); |
c8f94200 | 750 | } |
5061072f | 751 | break; |
752 | case 'v': | |
753 | if (!debug_flag) { | |
754 | debug_flag = 1; | |
755 | log_level = SYSLOG_LEVEL_DEBUG1; | |
756 | } | |
757 | else if (log_level < SYSLOG_LEVEL_DEBUG3) | |
758 | log_level++; | |
759 | else | |
760 | fatal("Too high debugging level."); | |
761 | break; | |
a204806b | 762 | case 'f': |
5061072f | 763 | if (strcmp(optarg, "-") == 0) |
764 | optarg = NULL; | |
765 | argv[fopt_count++] = optarg; | |
766 | break; | |
767 | case 't': | |
768 | get_keytypes = 0; | |
769 | tname = strtok(optarg, ","); | |
770 | while (tname) { | |
771 | int type = key_type_from_name(tname); | |
772 | switch (type) { | |
773 | case KEY_RSA1: | |
774 | get_keytypes |= KT_RSA1; | |
775 | break; | |
776 | case KEY_DSA: | |
777 | get_keytypes |= KT_DSA; | |
778 | break; | |
779 | case KEY_RSA: | |
780 | get_keytypes |= KT_RSA; | |
781 | break; | |
782 | case KEY_UNSPEC: | |
f48e63c8 | 783 | fatal("unknown key type %s", tname); |
5061072f | 784 | } |
785 | tname = strtok(NULL, ","); | |
786 | } | |
787 | break; | |
788 | case '4': | |
789 | IPv4or6 = AF_INET; | |
790 | break; | |
791 | case '6': | |
792 | IPv4or6 = AF_INET6; | |
793 | break; | |
794 | case '?': | |
795 | default: | |
f6fdbddf | 796 | usage(); |
5061072f | 797 | } |
f6fdbddf | 798 | } |
5061072f | 799 | if (optind == argc && !fopt_count) |
f6fdbddf | 800 | usage(); |
801 | ||
5061072f | 802 | log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); |
5061072f | 803 | |
f6fdbddf | 804 | maxfd = fdlim_get(1); |
805 | if (maxfd < 0) | |
227e8e86 | 806 | fatal("%s: fdlim_get: bad value", __progname); |
f6fdbddf | 807 | if (maxfd > MAXMAXFD) |
808 | maxfd = MAXMAXFD; | |
2671b47f | 809 | if (MAXCON <= 0) |
227e8e86 | 810 | fatal("%s: not enough file descriptors", __progname); |
f6fdbddf | 811 | if (maxfd > fdlim_get(0)) |
812 | fdlim_set(maxfd); | |
52e3daed | 813 | fdcon = xcalloc(maxfd, sizeof(con)); |
f6fdbddf | 814 | |
52e3daed | 815 | read_wait_nfdset = howmany(maxfd, NFDBITS); |
816 | read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask)); | |
ff7fee59 | 817 | |
5061072f | 818 | if (fopt_count) { |
819 | Linebuf *lb; | |
820 | char *line; | |
821 | int j; | |
822 | ||
823 | for (j = 0; j < fopt_count; j++) { | |
824 | lb = Linebuf_alloc(argv[j], error); | |
b7f79e7a | 825 | if (!lb) |
826 | continue; | |
5061072f | 827 | while ((line = Linebuf_getline(lb)) != NULL) |
828 | do_host(line); | |
829 | Linebuf_free(lb); | |
f6fdbddf | 830 | } |
5061072f | 831 | } |
832 | ||
833 | while (optind < argc) | |
834 | do_host(argv[optind++]); | |
835 | ||
f6fdbddf | 836 | while (ncon > 0) |
837 | conloop(); | |
838 | ||
839 | return (0); | |
840 | } |