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4c72fcfd | 1 | /* $OpenBSD: ssh-keyscan.c,v 1.66 2006/07/10 16:37:36 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> |
403a29ac | 14 | #include <errno.h> |
4c72fcfd | 15 | #include <stdarg.h> |
f6fdbddf | 16 | |
17 | #include <openssl/bn.h> | |
f6fdbddf | 18 | |
5061072f | 19 | #include <setjmp.h> |
f6fdbddf | 20 | #include "xmalloc.h" |
21 | #include "ssh.h" | |
42f11eb2 | 22 | #include "ssh1.h" |
f6fdbddf | 23 | #include "key.h" |
5061072f | 24 | #include "kex.h" |
25 | #include "compat.h" | |
26 | #include "myproposal.h" | |
27 | #include "packet.h" | |
28 | #include "dispatch.h" | |
f6fdbddf | 29 | #include "buffer.h" |
30 | #include "bufaux.h" | |
42f11eb2 | 31 | #include "log.h" |
2671b47f | 32 | #include "atomicio.h" |
5061072f | 33 | #include "misc.h" |
90a8ae9f | 34 | #include "hostfile.h" |
f6fdbddf | 35 | |
5061072f | 36 | /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. |
37 | Default value is AF_UNSPEC means both IPv4 and IPv6. */ | |
5061072f | 38 | int IPv4or6 = AF_UNSPEC; |
f6fdbddf | 39 | |
5061072f | 40 | int ssh_port = SSH_DEFAULT_PORT; |
a204806b | 41 | |
42 | #define KT_RSA1 1 | |
43 | #define KT_DSA 2 | |
44 | #define KT_RSA 4 | |
45 | ||
46 | int get_keytypes = KT_RSA1; /* Get only RSA1 keys by default */ | |
f6fdbddf | 47 | |
90a8ae9f | 48 | int hash_hosts = 0; /* Hash hostname on output */ |
49 | ||
f6fdbddf | 50 | #define MAXMAXFD 256 |
51 | ||
52 | /* The number of seconds after which to give up on a TCP connection */ | |
53 | int timeout = 5; | |
54 | ||
55 | int maxfd; | |
2671b47f | 56 | #define MAXCON (maxfd - 10) |
f6fdbddf | 57 | |
1fe6a48f | 58 | extern char *__progname; |
ff7fee59 | 59 | fd_set *read_wait; |
52e3daed | 60 | size_t read_wait_nfdset; |
f6fdbddf | 61 | int ncon; |
5061072f | 62 | int nonfatal_fatal = 0; |
63 | jmp_buf kexjmp; | |
4278ff63 | 64 | Key *kexjmp_key; |
f6fdbddf | 65 | |
66 | /* | |
67 | * Keep a connection structure for each file descriptor. The state | |
68 | * associated with file descriptor n is held in fdcon[n]. | |
69 | */ | |
70 | typedef struct Connection { | |
1e3b8b07 | 71 | u_char c_status; /* State of connection on this file desc. */ |
f6fdbddf | 72 | #define CS_UNUSED 0 /* File descriptor unused */ |
73 | #define CS_CON 1 /* Waiting to connect/read greeting */ | |
74 | #define CS_SIZE 2 /* Waiting to read initial packet size */ | |
75 | #define CS_KEYS 3 /* Waiting to read public key packet */ | |
76 | int c_fd; /* Quick lookup: c->c_fd == c - fdcon */ | |
77 | int c_plen; /* Packet length field for ssh packet */ | |
78 | int c_len; /* Total bytes which must be read. */ | |
79 | int c_off; /* Length of data read so far. */ | |
5061072f | 80 | int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */ |
f6fdbddf | 81 | char *c_namebase; /* Address to free for c_name and c_namelist */ |
82 | char *c_name; /* Hostname of connection for errors */ | |
83 | char *c_namelist; /* Pointer to other possible addresses */ | |
84 | char *c_output_name; /* Hostname of connection for output */ | |
85 | char *c_data; /* Data read from this fd */ | |
5061072f | 86 | Kex *c_kex; /* The key-exchange struct for ssh2 */ |
f6fdbddf | 87 | struct timeval c_tv; /* Time at which connection gets aborted */ |
88 | TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */ | |
89 | } con; | |
90 | ||
91 | TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */ | |
92 | con *fdcon; | |
93 | ||
94 | /* | |
95 | * This is just a wrapper around fgets() to make it usable. | |
96 | */ | |
97 | ||
98 | /* Stress-test. Increase this later. */ | |
99 | #define LINEBUF_SIZE 16 | |
100 | ||
101 | typedef struct { | |
102 | char *buf; | |
1e3b8b07 | 103 | u_int size; |
f6fdbddf | 104 | int lineno; |
105 | const char *filename; | |
106 | FILE *stream; | |
107 | void (*errfun) (const char *,...); | |
108 | } Linebuf; | |
109 | ||
396c147e | 110 | static Linebuf * |
f6fdbddf | 111 | Linebuf_alloc(const char *filename, void (*errfun) (const char *,...)) |
112 | { | |
113 | Linebuf *lb; | |
114 | ||
115 | if (!(lb = malloc(sizeof(*lb)))) { | |
116 | if (errfun) | |
f11fe301 | 117 | (*errfun) ("linebuf (%s): malloc failed\n", |
118 | filename ? filename : "(stdin)"); | |
f6fdbddf | 119 | return (NULL); |
120 | } | |
121 | if (filename) { | |
122 | lb->filename = filename; | |
123 | if (!(lb->stream = fopen(filename, "r"))) { | |
b5c334cc | 124 | xfree(lb); |
f6fdbddf | 125 | if (errfun) |
126 | (*errfun) ("%s: %s\n", filename, strerror(errno)); | |
127 | return (NULL); | |
128 | } | |
129 | } else { | |
130 | lb->filename = "(stdin)"; | |
131 | lb->stream = stdin; | |
132 | } | |
133 | ||
6e56dc92 | 134 | if (!(lb->buf = malloc((lb->size = LINEBUF_SIZE)))) { |
f6fdbddf | 135 | if (errfun) |
136 | (*errfun) ("linebuf (%s): malloc failed\n", lb->filename); | |
b5c334cc | 137 | xfree(lb); |
f6fdbddf | 138 | return (NULL); |
139 | } | |
140 | lb->errfun = errfun; | |
141 | lb->lineno = 0; | |
142 | return (lb); | |
143 | } | |
144 | ||
396c147e | 145 | static void |
f6fdbddf | 146 | Linebuf_free(Linebuf * lb) |
147 | { | |
148 | fclose(lb->stream); | |
b5c334cc | 149 | xfree(lb->buf); |
150 | xfree(lb); | |
f6fdbddf | 151 | } |
152 | ||
396c147e | 153 | #if 0 |
154 | static void | |
f6fdbddf | 155 | Linebuf_restart(Linebuf * lb) |
156 | { | |
157 | clearerr(lb->stream); | |
158 | rewind(lb->stream); | |
159 | lb->lineno = 0; | |
160 | } | |
161 | ||
396c147e | 162 | static int |
f6fdbddf | 163 | Linebuf_lineno(Linebuf * lb) |
164 | { | |
165 | return (lb->lineno); | |
166 | } | |
396c147e | 167 | #endif |
f6fdbddf | 168 | |
396c147e | 169 | static char * |
5be2ec5e | 170 | Linebuf_getline(Linebuf * lb) |
f6fdbddf | 171 | { |
2ceb8101 | 172 | size_t n = 0; |
50d2fbbc | 173 | void *p; |
f6fdbddf | 174 | |
175 | lb->lineno++; | |
176 | for (;;) { | |
177 | /* Read a line */ | |
178 | if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) { | |
179 | if (ferror(lb->stream) && lb->errfun) | |
50d2fbbc | 180 | (*lb->errfun)("%s: %s\n", lb->filename, |
778f6940 | 181 | strerror(errno)); |
f6fdbddf | 182 | return (NULL); |
183 | } | |
184 | n = strlen(lb->buf); | |
185 | ||
186 | /* Return it or an error if it fits */ | |
187 | if (n > 0 && lb->buf[n - 1] == '\n') { | |
188 | lb->buf[n - 1] = '\0'; | |
189 | return (lb->buf); | |
190 | } | |
191 | if (n != lb->size - 1) { | |
192 | if (lb->errfun) | |
50d2fbbc | 193 | (*lb->errfun)("%s: skipping incomplete last line\n", |
778f6940 | 194 | lb->filename); |
f6fdbddf | 195 | return (NULL); |
196 | } | |
197 | /* Double the buffer if we need more space */ | |
50d2fbbc | 198 | lb->size *= 2; |
199 | if ((p = realloc(lb->buf, lb->size)) == NULL) { | |
200 | lb->size /= 2; | |
f6fdbddf | 201 | if (lb->errfun) |
50d2fbbc | 202 | (*lb->errfun)("linebuf (%s): realloc failed\n", |
778f6940 | 203 | lb->filename); |
f6fdbddf | 204 | return (NULL); |
205 | } | |
50d2fbbc | 206 | lb->buf = p; |
f6fdbddf | 207 | } |
208 | } | |
209 | ||
396c147e | 210 | static int |
f6fdbddf | 211 | fdlim_get(int hard) |
212 | { | |
f318b98b | 213 | #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE) |
f6fdbddf | 214 | struct rlimit rlfd; |
778f6940 | 215 | |
f6fdbddf | 216 | if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) |
217 | return (-1); | |
218 | if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY) | |
341c3efe | 219 | return SSH_SYSFDMAX; |
f6fdbddf | 220 | else |
221 | return hard ? rlfd.rlim_max : rlfd.rlim_cur; | |
b03bd394 | 222 | #else |
341c3efe | 223 | return SSH_SYSFDMAX; |
b03bd394 | 224 | #endif |
f6fdbddf | 225 | } |
226 | ||
396c147e | 227 | static int |
f6fdbddf | 228 | fdlim_set(int lim) |
229 | { | |
f318b98b | 230 | #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) |
f6fdbddf | 231 | struct rlimit rlfd; |
b03bd394 | 232 | #endif |
41545cb6 | 233 | |
f6fdbddf | 234 | if (lim <= 0) |
235 | return (-1); | |
f318b98b | 236 | #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) |
f6fdbddf | 237 | if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) |
238 | return (-1); | |
239 | rlfd.rlim_cur = lim; | |
240 | if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0) | |
241 | return (-1); | |
b03bd394 | 242 | #elif defined (HAVE_SETDTABLESIZE) |
b705bea0 | 243 | setdtablesize(lim); |
b03bd394 | 244 | #endif |
f6fdbddf | 245 | return (0); |
246 | } | |
247 | ||
248 | /* | |
249 | * This is an strsep function that returns a null field for adjacent | |
250 | * separators. This is the same as the 4.4BSD strsep, but different from the | |
251 | * one in the GNU libc. | |
252 | */ | |
396c147e | 253 | static char * |
f6fdbddf | 254 | xstrsep(char **str, const char *delim) |
255 | { | |
256 | char *s, *e; | |
257 | ||
258 | if (!**str) | |
259 | return (NULL); | |
260 | ||
261 | s = *str; | |
262 | e = s + strcspn(s, delim); | |
263 | ||
264 | if (*e != '\0') | |
265 | *e++ = '\0'; | |
266 | *str = e; | |
267 | ||
268 | return (s); | |
269 | } | |
270 | ||
271 | /* | |
272 | * Get the next non-null token (like GNU strsep). Strsep() will return a | |
273 | * null token for two adjacent separators, so we may have to loop. | |
274 | */ | |
396c147e | 275 | static char * |
f6fdbddf | 276 | strnnsep(char **stringp, char *delim) |
277 | { | |
278 | char *tok; | |
279 | ||
280 | do { | |
281 | tok = xstrsep(stringp, delim); | |
282 | } while (tok && *tok == '\0'); | |
283 | return (tok); | |
284 | } | |
285 | ||
5061072f | 286 | static Key * |
287 | keygrab_ssh1(con *c) | |
f6fdbddf | 288 | { |
289 | static Key *rsa; | |
290 | static Buffer msg; | |
291 | ||
292 | if (rsa == NULL) { | |
293 | buffer_init(&msg); | |
294 | rsa = key_new(KEY_RSA1); | |
295 | } | |
5061072f | 296 | buffer_append(&msg, c->c_data, c->c_plen); |
297 | buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */ | |
f6fdbddf | 298 | if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) { |
5061072f | 299 | error("%s: invalid packet type", c->c_name); |
f6fdbddf | 300 | buffer_clear(&msg); |
5061072f | 301 | return NULL; |
f6fdbddf | 302 | } |
303 | buffer_consume(&msg, 8); /* cookie */ | |
304 | ||
305 | /* server key */ | |
306 | (void) buffer_get_int(&msg); | |
307 | buffer_get_bignum(&msg, rsa->rsa->e); | |
308 | buffer_get_bignum(&msg, rsa->rsa->n); | |
309 | ||
310 | /* host key */ | |
311 | (void) buffer_get_int(&msg); | |
312 | buffer_get_bignum(&msg, rsa->rsa->e); | |
313 | buffer_get_bignum(&msg, rsa->rsa->n); | |
5061072f | 314 | |
f6fdbddf | 315 | buffer_clear(&msg); |
316 | ||
5061072f | 317 | return (rsa); |
318 | } | |
319 | ||
320 | static int | |
321 | hostjump(Key *hostkey) | |
322 | { | |
4278ff63 | 323 | kexjmp_key = hostkey; |
324 | longjmp(kexjmp, 1); | |
5061072f | 325 | } |
326 | ||
327 | static int | |
328 | ssh2_capable(int remote_major, int remote_minor) | |
329 | { | |
330 | switch (remote_major) { | |
331 | case 1: | |
332 | if (remote_minor == 99) | |
333 | return 1; | |
334 | break; | |
335 | case 2: | |
336 | return 1; | |
337 | default: | |
338 | break; | |
339 | } | |
340 | return 0; | |
341 | } | |
342 | ||
343 | static Key * | |
344 | keygrab_ssh2(con *c) | |
345 | { | |
346 | int j; | |
347 | ||
348 | packet_set_connection(c->c_fd, c->c_fd); | |
349 | enable_compat20(); | |
350 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA? | |
351 | "ssh-dss": "ssh-rsa"; | |
352 | c->c_kex = kex_setup(myproposal); | |
98a58eda | 353 | c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
41e5bd9a | 354 | c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; |
98a58eda | 355 | c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; |
2ff8003a | 356 | c->c_kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; |
5061072f | 357 | c->c_kex->verify_host_key = hostjump; |
358 | ||
359 | if (!(j = setjmp(kexjmp))) { | |
360 | nonfatal_fatal = 1; | |
361 | dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex); | |
362 | fprintf(stderr, "Impossible! dispatch_run() returned!\n"); | |
363 | exit(1); | |
364 | } | |
365 | nonfatal_fatal = 0; | |
366 | xfree(c->c_kex); | |
367 | c->c_kex = NULL; | |
368 | packet_close(); | |
5061072f | 369 | |
4278ff63 | 370 | return j < 0? NULL : kexjmp_key; |
5061072f | 371 | } |
372 | ||
373 | static void | |
374 | keyprint(con *c, Key *key) | |
375 | { | |
90a8ae9f | 376 | char *host = c->c_output_name ? c->c_output_name : c->c_name; |
377 | ||
5061072f | 378 | if (!key) |
379 | return; | |
90a8ae9f | 380 | if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL) |
381 | fatal("host_hash failed"); | |
5061072f | 382 | |
90a8ae9f | 383 | fprintf(stdout, "%s ", host); |
5061072f | 384 | key_write(key, stdout); |
f6fdbddf | 385 | fputs("\n", stdout); |
386 | } | |
387 | ||
396c147e | 388 | static int |
f6fdbddf | 389 | tcpconnect(char *host) |
390 | { | |
391 | struct addrinfo hints, *ai, *aitop; | |
392 | char strport[NI_MAXSERV]; | |
393 | int gaierr, s = -1; | |
394 | ||
5061072f | 395 | snprintf(strport, sizeof strport, "%d", ssh_port); |
f6fdbddf | 396 | memset(&hints, 0, sizeof(hints)); |
5061072f | 397 | hints.ai_family = IPv4or6; |
f6fdbddf | 398 | hints.ai_socktype = SOCK_STREAM; |
399 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) | |
400 | fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr)); | |
401 | for (ai = aitop; ai; ai = ai->ai_next) { | |
3e131a6d | 402 | s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
f6fdbddf | 403 | if (s < 0) { |
404 | error("socket: %s", strerror(errno)); | |
405 | continue; | |
406 | } | |
170694d7 | 407 | if (set_nonblock(s) == -1) |
408 | fatal("%s: set_nonblock(%d)", __func__, s); | |
f6fdbddf | 409 | if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 && |
410 | errno != EINPROGRESS) | |
411 | error("connect (`%s'): %s", host, strerror(errno)); | |
412 | else | |
413 | break; | |
414 | close(s); | |
415 | s = -1; | |
416 | } | |
417 | freeaddrinfo(aitop); | |
418 | return s; | |
419 | } | |
420 | ||
396c147e | 421 | static int |
5061072f | 422 | conalloc(char *iname, char *oname, int keytype) |
f6fdbddf | 423 | { |
f6fdbddf | 424 | char *namebase, *name, *namelist; |
50d2fbbc | 425 | int s; |
f6fdbddf | 426 | |
427 | namebase = namelist = xstrdup(iname); | |
428 | ||
429 | do { | |
430 | name = xstrsep(&namelist, ","); | |
431 | if (!name) { | |
b5c334cc | 432 | xfree(namebase); |
f6fdbddf | 433 | return (-1); |
434 | } | |
435 | } while ((s = tcpconnect(name)) < 0); | |
436 | ||
437 | if (s >= maxfd) | |
227e8e86 | 438 | fatal("conalloc: fdno %d too high", s); |
f6fdbddf | 439 | if (fdcon[s].c_status) |
227e8e86 | 440 | fatal("conalloc: attempt to reuse fdno %d", s); |
f6fdbddf | 441 | |
442 | fdcon[s].c_fd = s; | |
443 | fdcon[s].c_status = CS_CON; | |
444 | fdcon[s].c_namebase = namebase; | |
445 | fdcon[s].c_name = name; | |
446 | fdcon[s].c_namelist = namelist; | |
447 | fdcon[s].c_output_name = xstrdup(oname); | |
448 | fdcon[s].c_data = (char *) &fdcon[s].c_plen; | |
449 | fdcon[s].c_len = 4; | |
450 | fdcon[s].c_off = 0; | |
5061072f | 451 | fdcon[s].c_keytype = keytype; |
f6fdbddf | 452 | gettimeofday(&fdcon[s].c_tv, NULL); |
453 | fdcon[s].c_tv.tv_sec += timeout; | |
454 | TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); | |
ff7fee59 | 455 | FD_SET(s, read_wait); |
f6fdbddf | 456 | ncon++; |
457 | return (s); | |
458 | } | |
459 | ||
396c147e | 460 | static void |
f6fdbddf | 461 | confree(int s) |
462 | { | |
f6fdbddf | 463 | if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) |
227e8e86 | 464 | fatal("confree: attempt to free bad fdno %d", s); |
2671b47f | 465 | close(s); |
b5c334cc | 466 | xfree(fdcon[s].c_namebase); |
467 | xfree(fdcon[s].c_output_name); | |
f6fdbddf | 468 | if (fdcon[s].c_status == CS_KEYS) |
b5c334cc | 469 | xfree(fdcon[s].c_data); |
f6fdbddf | 470 | fdcon[s].c_status = CS_UNUSED; |
5061072f | 471 | fdcon[s].c_keytype = 0; |
f6fdbddf | 472 | TAILQ_REMOVE(&tq, &fdcon[s], c_link); |
ff7fee59 | 473 | FD_CLR(s, read_wait); |
f6fdbddf | 474 | ncon--; |
475 | } | |
476 | ||
396c147e | 477 | static void |
f6fdbddf | 478 | contouch(int s) |
479 | { | |
480 | TAILQ_REMOVE(&tq, &fdcon[s], c_link); | |
481 | gettimeofday(&fdcon[s].c_tv, NULL); | |
482 | fdcon[s].c_tv.tv_sec += timeout; | |
483 | TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); | |
484 | } | |
485 | ||
396c147e | 486 | static int |
f6fdbddf | 487 | conrecycle(int s) |
488 | { | |
f6fdbddf | 489 | con *c = &fdcon[s]; |
50d2fbbc | 490 | int ret; |
f6fdbddf | 491 | |
5061072f | 492 | ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); |
f6fdbddf | 493 | confree(s); |
f6fdbddf | 494 | return (ret); |
495 | } | |
496 | ||
396c147e | 497 | static void |
f6fdbddf | 498 | congreet(int s) |
499 | { | |
2ceb8101 | 500 | int n = 0, remote_major = 0, remote_minor = 0; |
5061072f | 501 | char buf[256], *cp; |
cdc95d6e | 502 | char remote_version[sizeof buf]; |
2ceb8101 | 503 | size_t bufsiz; |
f6fdbddf | 504 | con *c = &fdcon[s]; |
505 | ||
2995db03 | 506 | for (;;) { |
507 | memset(buf, '\0', sizeof(buf)); | |
508 | bufsiz = sizeof(buf); | |
509 | cp = buf; | |
510 | while (bufsiz-- && | |
511 | (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') { | |
512 | if (*cp == '\r') | |
513 | *cp = '\n'; | |
514 | cp++; | |
515 | } | |
516 | if (n != 1 || strncmp(buf, "SSH-", 4) == 0) | |
517 | break; | |
578954b1 | 518 | } |
27452401 | 519 | if (n == 0) { |
05624c18 | 520 | switch (errno) { |
521 | case EPIPE: | |
522 | error("%s: Connection closed by remote host", c->c_name); | |
523 | break; | |
524 | case ECONNREFUSED: | |
525 | break; | |
526 | default: | |
527 | error("read (%s): %s", c->c_name, strerror(errno)); | |
528 | break; | |
529 | } | |
27452401 | 530 | conrecycle(s); |
531 | return; | |
532 | } | |
c16c7f20 | 533 | if (*cp != '\n' && *cp != '\r') { |
f6fdbddf | 534 | error("%s: bad greeting", c->c_name); |
535 | confree(s); | |
536 | return; | |
537 | } | |
c16c7f20 | 538 | *cp = '\0'; |
cdc95d6e | 539 | if (sscanf(buf, "SSH-%d.%d-%[^\n]\n", |
540 | &remote_major, &remote_minor, remote_version) == 3) | |
541 | compat_datafellows(remote_version); | |
542 | else | |
543 | datafellows = 0; | |
5061072f | 544 | if (c->c_keytype != KT_RSA1) { |
5061072f | 545 | if (!ssh2_capable(remote_major, remote_minor)) { |
546 | debug("%s doesn't support ssh2", c->c_name); | |
547 | confree(s); | |
548 | return; | |
549 | } | |
cdc95d6e | 550 | } else if (remote_major != 1) { |
551 | debug("%s doesn't support ssh1", c->c_name); | |
552 | confree(s); | |
553 | return; | |
5061072f | 554 | } |
578954b1 | 555 | fprintf(stderr, "# %s %s\n", c->c_name, chop(buf)); |
5061072f | 556 | n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", |
557 | c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2, | |
558 | c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2); | |
2ceb8101 | 559 | if (n < 0 || (size_t)n >= sizeof(buf)) { |
4b826d75 | 560 | error("snprintf: buffer too small"); |
561 | confree(s); | |
562 | return; | |
563 | } | |
2ceb8101 | 564 | if (atomicio(vwrite, s, buf, n) != (size_t)n) { |
f6fdbddf | 565 | error("write (%s): %s", c->c_name, strerror(errno)); |
566 | confree(s); | |
567 | return; | |
568 | } | |
5061072f | 569 | if (c->c_keytype != KT_RSA1) { |
570 | keyprint(c, keygrab_ssh2(c)); | |
571 | confree(s); | |
572 | return; | |
573 | } | |
f6fdbddf | 574 | c->c_status = CS_SIZE; |
575 | contouch(s); | |
576 | } | |
577 | ||
396c147e | 578 | static void |
f6fdbddf | 579 | conread(int s) |
580 | { | |
f6fdbddf | 581 | con *c = &fdcon[s]; |
05624c18 | 582 | size_t n; |
f6fdbddf | 583 | |
584 | if (c->c_status == CS_CON) { | |
585 | congreet(s); | |
586 | return; | |
587 | } | |
f581b6e8 | 588 | n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off); |
05624c18 | 589 | if (n == 0) { |
f6fdbddf | 590 | error("read (%s): %s", c->c_name, strerror(errno)); |
591 | confree(s); | |
592 | return; | |
593 | } | |
594 | c->c_off += n; | |
595 | ||
596 | if (c->c_off == c->c_len) | |
597 | switch (c->c_status) { | |
598 | case CS_SIZE: | |
599 | c->c_plen = htonl(c->c_plen); | |
600 | c->c_len = c->c_plen + 8 - (c->c_plen & 7); | |
601 | c->c_off = 0; | |
602 | c->c_data = xmalloc(c->c_len); | |
603 | c->c_status = CS_KEYS; | |
604 | break; | |
605 | case CS_KEYS: | |
5061072f | 606 | keyprint(c, keygrab_ssh1(c)); |
f6fdbddf | 607 | confree(s); |
608 | return; | |
f6fdbddf | 609 | default: |
227e8e86 | 610 | fatal("conread: invalid status %d", c->c_status); |
f6fdbddf | 611 | break; |
612 | } | |
613 | ||
614 | contouch(s); | |
615 | } | |
616 | ||
396c147e | 617 | static void |
f6fdbddf | 618 | conloop(void) |
619 | { | |
f6fdbddf | 620 | struct timeval seltime, now; |
50d2fbbc | 621 | fd_set *r, *e; |
f6fdbddf | 622 | con *c; |
50d2fbbc | 623 | int i; |
f6fdbddf | 624 | |
625 | gettimeofday(&now, NULL); | |
48ba8dc8 | 626 | c = TAILQ_FIRST(&tq); |
f6fdbddf | 627 | |
2671b47f | 628 | if (c && (c->c_tv.tv_sec > now.tv_sec || |
629 | (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) { | |
f6fdbddf | 630 | seltime = c->c_tv; |
631 | seltime.tv_sec -= now.tv_sec; | |
632 | seltime.tv_usec -= now.tv_usec; | |
5be2ec5e | 633 | if (seltime.tv_usec < 0) { |
f6fdbddf | 634 | seltime.tv_usec += 1000000; |
635 | seltime.tv_sec--; | |
636 | } | |
637 | } else | |
638 | seltime.tv_sec = seltime.tv_usec = 0; | |
639 | ||
52e3daed | 640 | r = xcalloc(read_wait_nfdset, sizeof(fd_mask)); |
641 | e = xcalloc(read_wait_nfdset, sizeof(fd_mask)); | |
642 | memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask)); | |
643 | memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask)); | |
ff7fee59 | 644 | |
645 | while (select(maxfd, r, NULL, e, &seltime) == -1 && | |
fd193ca4 | 646 | (errno == EAGAIN || errno == EINTR)) |
647 | ; | |
648 | ||
2671b47f | 649 | for (i = 0; i < maxfd; i++) { |
ff7fee59 | 650 | if (FD_ISSET(i, e)) { |
f6fdbddf | 651 | error("%s: exception!", fdcon[i].c_name); |
652 | confree(i); | |
ff7fee59 | 653 | } else if (FD_ISSET(i, r)) |
f6fdbddf | 654 | conread(i); |
2671b47f | 655 | } |
ff7fee59 | 656 | xfree(r); |
657 | xfree(e); | |
f6fdbddf | 658 | |
48ba8dc8 | 659 | c = TAILQ_FIRST(&tq); |
2671b47f | 660 | while (c && (c->c_tv.tv_sec < now.tv_sec || |
661 | (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) { | |
f6fdbddf | 662 | int s = c->c_fd; |
2671b47f | 663 | |
48ba8dc8 | 664 | c = TAILQ_NEXT(c, c_link); |
f6fdbddf | 665 | conrecycle(s); |
666 | } | |
667 | } | |
668 | ||
5061072f | 669 | static void |
670 | do_host(char *host) | |
f6fdbddf | 671 | { |
5061072f | 672 | char *name = strnnsep(&host, " \t\n"); |
673 | int j; | |
674 | ||
0408c978 | 675 | if (name == NULL) |
676 | return; | |
5061072f | 677 | for (j = KT_RSA1; j <= KT_RSA; j *= 2) { |
678 | if (get_keytypes & j) { | |
679 | while (ncon >= MAXCON) | |
680 | conloop(); | |
681 | conalloc(name, *host ? host : name, j); | |
f6fdbddf | 682 | } |
683 | } | |
684 | } | |
685 | ||
2bae80e9 | 686 | void |
687 | fatal(const char *fmt,...) | |
5061072f | 688 | { |
2bae80e9 | 689 | va_list args; |
50d2fbbc | 690 | |
2bae80e9 | 691 | va_start(args, fmt); |
692 | do_log(SYSLOG_LEVEL_FATAL, fmt, args); | |
693 | va_end(args); | |
5061072f | 694 | if (nonfatal_fatal) |
695 | longjmp(kexjmp, -1); | |
2bae80e9 | 696 | else |
eec6d341 | 697 | exit(255); |
5061072f | 698 | } |
699 | ||
396c147e | 700 | static void |
f6fdbddf | 701 | usage(void) |
702 | { | |
3bafbaa7 | 703 | fprintf(stderr, "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n" |
50d2fbbc | 704 | "\t\t [host | addrlist namelist] [...]\n", |
33e766d2 | 705 | __progname); |
33e766d2 | 706 | exit(1); |
f6fdbddf | 707 | } |
708 | ||
709 | int | |
710 | main(int argc, char **argv) | |
711 | { | |
5061072f | 712 | int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; |
713 | int opt, fopt_count = 0; | |
714 | char *tname; | |
a204806b | 715 | |
5061072f | 716 | extern int optind; |
717 | extern char *optarg; | |
f6fdbddf | 718 | |
fda04d7d | 719 | __progname = ssh_get_progname(argv[0]); |
8782141f | 720 | init_rng(); |
721 | seed_rng(); | |
f6fdbddf | 722 | TAILQ_INIT(&tq); |
723 | ||
fd6168c1 | 724 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
725 | sanitise_stdfd(); | |
726 | ||
5061072f | 727 | if (argc <= 1) |
f6fdbddf | 728 | usage(); |
729 | ||
90a8ae9f | 730 | while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) { |
5061072f | 731 | switch (opt) { |
90a8ae9f | 732 | case 'H': |
733 | hash_hosts = 1; | |
734 | break; | |
5061072f | 735 | case 'p': |
736 | ssh_port = a2port(optarg); | |
737 | if (ssh_port == 0) { | |
738 | fprintf(stderr, "Bad port '%s'\n", optarg); | |
739 | exit(1); | |
740 | } | |
741 | break; | |
742 | case 'T': | |
c8f94200 | 743 | timeout = convtime(optarg); |
744 | if (timeout == -1 || timeout == 0) { | |
745 | fprintf(stderr, "Bad timeout '%s'\n", optarg); | |
f6fdbddf | 746 | usage(); |
c8f94200 | 747 | } |
5061072f | 748 | break; |
749 | case 'v': | |
750 | if (!debug_flag) { | |
751 | debug_flag = 1; | |
752 | log_level = SYSLOG_LEVEL_DEBUG1; | |
753 | } | |
754 | else if (log_level < SYSLOG_LEVEL_DEBUG3) | |
755 | log_level++; | |
756 | else | |
757 | fatal("Too high debugging level."); | |
758 | break; | |
a204806b | 759 | case 'f': |
5061072f | 760 | if (strcmp(optarg, "-") == 0) |
761 | optarg = NULL; | |
762 | argv[fopt_count++] = optarg; | |
763 | break; | |
764 | case 't': | |
765 | get_keytypes = 0; | |
766 | tname = strtok(optarg, ","); | |
767 | while (tname) { | |
768 | int type = key_type_from_name(tname); | |
769 | switch (type) { | |
770 | case KEY_RSA1: | |
771 | get_keytypes |= KT_RSA1; | |
772 | break; | |
773 | case KEY_DSA: | |
774 | get_keytypes |= KT_DSA; | |
775 | break; | |
776 | case KEY_RSA: | |
777 | get_keytypes |= KT_RSA; | |
778 | break; | |
779 | case KEY_UNSPEC: | |
f48e63c8 | 780 | fatal("unknown key type %s", tname); |
5061072f | 781 | } |
782 | tname = strtok(NULL, ","); | |
783 | } | |
784 | break; | |
785 | case '4': | |
786 | IPv4or6 = AF_INET; | |
787 | break; | |
788 | case '6': | |
789 | IPv4or6 = AF_INET6; | |
790 | break; | |
791 | case '?': | |
792 | default: | |
f6fdbddf | 793 | usage(); |
5061072f | 794 | } |
f6fdbddf | 795 | } |
5061072f | 796 | if (optind == argc && !fopt_count) |
f6fdbddf | 797 | usage(); |
798 | ||
5061072f | 799 | log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); |
5061072f | 800 | |
f6fdbddf | 801 | maxfd = fdlim_get(1); |
802 | if (maxfd < 0) | |
227e8e86 | 803 | fatal("%s: fdlim_get: bad value", __progname); |
f6fdbddf | 804 | if (maxfd > MAXMAXFD) |
805 | maxfd = MAXMAXFD; | |
2671b47f | 806 | if (MAXCON <= 0) |
227e8e86 | 807 | fatal("%s: not enough file descriptors", __progname); |
f6fdbddf | 808 | if (maxfd > fdlim_get(0)) |
809 | fdlim_set(maxfd); | |
52e3daed | 810 | fdcon = xcalloc(maxfd, sizeof(con)); |
f6fdbddf | 811 | |
52e3daed | 812 | read_wait_nfdset = howmany(maxfd, NFDBITS); |
813 | read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask)); | |
ff7fee59 | 814 | |
5061072f | 815 | if (fopt_count) { |
816 | Linebuf *lb; | |
817 | char *line; | |
818 | int j; | |
819 | ||
820 | for (j = 0; j < fopt_count; j++) { | |
821 | lb = Linebuf_alloc(argv[j], error); | |
b7f79e7a | 822 | if (!lb) |
823 | continue; | |
5061072f | 824 | while ((line = Linebuf_getline(lb)) != NULL) |
825 | do_host(line); | |
826 | Linebuf_free(lb); | |
f6fdbddf | 827 | } |
5061072f | 828 | } |
829 | ||
830 | while (optind < argc) | |
831 | do_host(argv[optind++]); | |
832 | ||
f6fdbddf | 833 | while (ncon > 0) |
834 | conloop(); | |
835 | ||
836 | return (0); | |
837 | } |