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Commit | Line | Data |
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f6fdbddf | 1 | /* |
2 | * Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>. | |
3 | * | |
4 | * Modification and redistribution in source and binary forms is | |
5 | * permitted provided that due credit is given to the author and the | |
aa144206 | 6 | * OpenBSD project by leaving this copyright notice intact. |
f6fdbddf | 7 | */ |
8 | ||
9 | #include "includes.h" | |
b655d28c | 10 | RCSID("$OpenBSD: ssh-keyscan.c,v 1.47 2004/03/08 09:38:05 djm Exp $"); |
f6fdbddf | 11 | |
9fd2a215 | 12 | #include "openbsd-compat/sys-queue.h" |
f6fdbddf | 13 | |
14 | #include <openssl/bn.h> | |
f6fdbddf | 15 | |
5061072f | 16 | #include <setjmp.h> |
f6fdbddf | 17 | #include "xmalloc.h" |
18 | #include "ssh.h" | |
42f11eb2 | 19 | #include "ssh1.h" |
f6fdbddf | 20 | #include "key.h" |
5061072f | 21 | #include "kex.h" |
22 | #include "compat.h" | |
23 | #include "myproposal.h" | |
24 | #include "packet.h" | |
25 | #include "dispatch.h" | |
f6fdbddf | 26 | #include "buffer.h" |
27 | #include "bufaux.h" | |
42f11eb2 | 28 | #include "log.h" |
2671b47f | 29 | #include "atomicio.h" |
5061072f | 30 | #include "misc.h" |
f6fdbddf | 31 | |
5061072f | 32 | /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. |
33 | Default value is AF_UNSPEC means both IPv4 and IPv6. */ | |
5061072f | 34 | int IPv4or6 = AF_UNSPEC; |
f6fdbddf | 35 | |
5061072f | 36 | int ssh_port = SSH_DEFAULT_PORT; |
a204806b | 37 | |
38 | #define KT_RSA1 1 | |
39 | #define KT_DSA 2 | |
40 | #define KT_RSA 4 | |
41 | ||
42 | int get_keytypes = KT_RSA1; /* Get only RSA1 keys by default */ | |
f6fdbddf | 43 | |
f6fdbddf | 44 | #define MAXMAXFD 256 |
45 | ||
46 | /* The number of seconds after which to give up on a TCP connection */ | |
47 | int timeout = 5; | |
48 | ||
49 | int maxfd; | |
2671b47f | 50 | #define MAXCON (maxfd - 10) |
f6fdbddf | 51 | |
1fe6a48f | 52 | #ifdef HAVE___PROGNAME |
53 | extern char *__progname; | |
54 | #else | |
55 | char *__progname; | |
56 | #endif | |
ff7fee59 | 57 | fd_set *read_wait; |
58 | size_t read_wait_size; | |
f6fdbddf | 59 | int ncon; |
5061072f | 60 | int nonfatal_fatal = 0; |
61 | jmp_buf kexjmp; | |
4278ff63 | 62 | Key *kexjmp_key; |
f6fdbddf | 63 | |
64 | /* | |
65 | * Keep a connection structure for each file descriptor. The state | |
66 | * associated with file descriptor n is held in fdcon[n]. | |
67 | */ | |
68 | typedef struct Connection { | |
1e3b8b07 | 69 | u_char c_status; /* State of connection on this file desc. */ |
f6fdbddf | 70 | #define CS_UNUSED 0 /* File descriptor unused */ |
71 | #define CS_CON 1 /* Waiting to connect/read greeting */ | |
72 | #define CS_SIZE 2 /* Waiting to read initial packet size */ | |
73 | #define CS_KEYS 3 /* Waiting to read public key packet */ | |
74 | int c_fd; /* Quick lookup: c->c_fd == c - fdcon */ | |
75 | int c_plen; /* Packet length field for ssh packet */ | |
76 | int c_len; /* Total bytes which must be read. */ | |
77 | int c_off; /* Length of data read so far. */ | |
5061072f | 78 | int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */ |
f6fdbddf | 79 | char *c_namebase; /* Address to free for c_name and c_namelist */ |
80 | char *c_name; /* Hostname of connection for errors */ | |
81 | char *c_namelist; /* Pointer to other possible addresses */ | |
82 | char *c_output_name; /* Hostname of connection for output */ | |
83 | char *c_data; /* Data read from this fd */ | |
5061072f | 84 | Kex *c_kex; /* The key-exchange struct for ssh2 */ |
f6fdbddf | 85 | struct timeval c_tv; /* Time at which connection gets aborted */ |
86 | TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */ | |
87 | } con; | |
88 | ||
89 | TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */ | |
90 | con *fdcon; | |
91 | ||
92 | /* | |
93 | * This is just a wrapper around fgets() to make it usable. | |
94 | */ | |
95 | ||
96 | /* Stress-test. Increase this later. */ | |
97 | #define LINEBUF_SIZE 16 | |
98 | ||
99 | typedef struct { | |
100 | char *buf; | |
1e3b8b07 | 101 | u_int size; |
f6fdbddf | 102 | int lineno; |
103 | const char *filename; | |
104 | FILE *stream; | |
105 | void (*errfun) (const char *,...); | |
106 | } Linebuf; | |
107 | ||
396c147e | 108 | static Linebuf * |
f6fdbddf | 109 | Linebuf_alloc(const char *filename, void (*errfun) (const char *,...)) |
110 | { | |
111 | Linebuf *lb; | |
112 | ||
113 | if (!(lb = malloc(sizeof(*lb)))) { | |
114 | if (errfun) | |
f11fe301 | 115 | (*errfun) ("linebuf (%s): malloc failed\n", |
116 | filename ? filename : "(stdin)"); | |
f6fdbddf | 117 | return (NULL); |
118 | } | |
119 | if (filename) { | |
120 | lb->filename = filename; | |
121 | if (!(lb->stream = fopen(filename, "r"))) { | |
b5c334cc | 122 | xfree(lb); |
f6fdbddf | 123 | if (errfun) |
124 | (*errfun) ("%s: %s\n", filename, strerror(errno)); | |
125 | return (NULL); | |
126 | } | |
127 | } else { | |
128 | lb->filename = "(stdin)"; | |
129 | lb->stream = stdin; | |
130 | } | |
131 | ||
132 | if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) { | |
133 | if (errfun) | |
134 | (*errfun) ("linebuf (%s): malloc failed\n", lb->filename); | |
b5c334cc | 135 | xfree(lb); |
f6fdbddf | 136 | return (NULL); |
137 | } | |
138 | lb->errfun = errfun; | |
139 | lb->lineno = 0; | |
140 | return (lb); | |
141 | } | |
142 | ||
396c147e | 143 | static void |
f6fdbddf | 144 | Linebuf_free(Linebuf * lb) |
145 | { | |
146 | fclose(lb->stream); | |
b5c334cc | 147 | xfree(lb->buf); |
148 | xfree(lb); | |
f6fdbddf | 149 | } |
150 | ||
396c147e | 151 | #if 0 |
152 | static void | |
f6fdbddf | 153 | Linebuf_restart(Linebuf * lb) |
154 | { | |
155 | clearerr(lb->stream); | |
156 | rewind(lb->stream); | |
157 | lb->lineno = 0; | |
158 | } | |
159 | ||
396c147e | 160 | static int |
f6fdbddf | 161 | Linebuf_lineno(Linebuf * lb) |
162 | { | |
163 | return (lb->lineno); | |
164 | } | |
396c147e | 165 | #endif |
f6fdbddf | 166 | |
396c147e | 167 | static char * |
5be2ec5e | 168 | Linebuf_getline(Linebuf * lb) |
f6fdbddf | 169 | { |
170 | int n = 0; | |
50d2fbbc | 171 | void *p; |
f6fdbddf | 172 | |
173 | lb->lineno++; | |
174 | for (;;) { | |
175 | /* Read a line */ | |
176 | if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) { | |
177 | if (ferror(lb->stream) && lb->errfun) | |
50d2fbbc | 178 | (*lb->errfun)("%s: %s\n", lb->filename, |
778f6940 | 179 | strerror(errno)); |
f6fdbddf | 180 | return (NULL); |
181 | } | |
182 | n = strlen(lb->buf); | |
183 | ||
184 | /* Return it or an error if it fits */ | |
185 | if (n > 0 && lb->buf[n - 1] == '\n') { | |
186 | lb->buf[n - 1] = '\0'; | |
187 | return (lb->buf); | |
188 | } | |
189 | if (n != lb->size - 1) { | |
190 | if (lb->errfun) | |
50d2fbbc | 191 | (*lb->errfun)("%s: skipping incomplete last line\n", |
778f6940 | 192 | lb->filename); |
f6fdbddf | 193 | return (NULL); |
194 | } | |
195 | /* Double the buffer if we need more space */ | |
50d2fbbc | 196 | lb->size *= 2; |
197 | if ((p = realloc(lb->buf, lb->size)) == NULL) { | |
198 | lb->size /= 2; | |
f6fdbddf | 199 | if (lb->errfun) |
50d2fbbc | 200 | (*lb->errfun)("linebuf (%s): realloc failed\n", |
778f6940 | 201 | lb->filename); |
f6fdbddf | 202 | return (NULL); |
203 | } | |
50d2fbbc | 204 | lb->buf = p; |
f6fdbddf | 205 | } |
206 | } | |
207 | ||
396c147e | 208 | static int |
f6fdbddf | 209 | fdlim_get(int hard) |
210 | { | |
f318b98b | 211 | #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE) |
f6fdbddf | 212 | struct rlimit rlfd; |
778f6940 | 213 | |
f6fdbddf | 214 | if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) |
215 | return (-1); | |
216 | if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY) | |
341c3efe | 217 | return SSH_SYSFDMAX; |
f6fdbddf | 218 | else |
219 | return hard ? rlfd.rlim_max : rlfd.rlim_cur; | |
b03bd394 | 220 | #else |
341c3efe | 221 | return SSH_SYSFDMAX; |
b03bd394 | 222 | #endif |
f6fdbddf | 223 | } |
224 | ||
396c147e | 225 | static int |
f6fdbddf | 226 | fdlim_set(int lim) |
227 | { | |
f318b98b | 228 | #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) |
f6fdbddf | 229 | struct rlimit rlfd; |
b03bd394 | 230 | #endif |
41545cb6 | 231 | |
f6fdbddf | 232 | if (lim <= 0) |
233 | return (-1); | |
f318b98b | 234 | #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) |
f6fdbddf | 235 | if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) |
236 | return (-1); | |
237 | rlfd.rlim_cur = lim; | |
238 | if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0) | |
239 | return (-1); | |
b03bd394 | 240 | #elif defined (HAVE_SETDTABLESIZE) |
b705bea0 | 241 | setdtablesize(lim); |
b03bd394 | 242 | #endif |
f6fdbddf | 243 | return (0); |
244 | } | |
245 | ||
246 | /* | |
247 | * This is an strsep function that returns a null field for adjacent | |
248 | * separators. This is the same as the 4.4BSD strsep, but different from the | |
249 | * one in the GNU libc. | |
250 | */ | |
396c147e | 251 | static char * |
f6fdbddf | 252 | xstrsep(char **str, const char *delim) |
253 | { | |
254 | char *s, *e; | |
255 | ||
256 | if (!**str) | |
257 | return (NULL); | |
258 | ||
259 | s = *str; | |
260 | e = s + strcspn(s, delim); | |
261 | ||
262 | if (*e != '\0') | |
263 | *e++ = '\0'; | |
264 | *str = e; | |
265 | ||
266 | return (s); | |
267 | } | |
268 | ||
269 | /* | |
270 | * Get the next non-null token (like GNU strsep). Strsep() will return a | |
271 | * null token for two adjacent separators, so we may have to loop. | |
272 | */ | |
396c147e | 273 | static char * |
f6fdbddf | 274 | strnnsep(char **stringp, char *delim) |
275 | { | |
276 | char *tok; | |
277 | ||
278 | do { | |
279 | tok = xstrsep(stringp, delim); | |
280 | } while (tok && *tok == '\0'); | |
281 | return (tok); | |
282 | } | |
283 | ||
5061072f | 284 | static Key * |
285 | keygrab_ssh1(con *c) | |
f6fdbddf | 286 | { |
287 | static Key *rsa; | |
288 | static Buffer msg; | |
289 | ||
290 | if (rsa == NULL) { | |
291 | buffer_init(&msg); | |
292 | rsa = key_new(KEY_RSA1); | |
293 | } | |
5061072f | 294 | buffer_append(&msg, c->c_data, c->c_plen); |
295 | buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */ | |
f6fdbddf | 296 | if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) { |
5061072f | 297 | error("%s: invalid packet type", c->c_name); |
f6fdbddf | 298 | buffer_clear(&msg); |
5061072f | 299 | return NULL; |
f6fdbddf | 300 | } |
301 | buffer_consume(&msg, 8); /* cookie */ | |
302 | ||
303 | /* server key */ | |
304 | (void) buffer_get_int(&msg); | |
305 | buffer_get_bignum(&msg, rsa->rsa->e); | |
306 | buffer_get_bignum(&msg, rsa->rsa->n); | |
307 | ||
308 | /* host key */ | |
309 | (void) buffer_get_int(&msg); | |
310 | buffer_get_bignum(&msg, rsa->rsa->e); | |
311 | buffer_get_bignum(&msg, rsa->rsa->n); | |
5061072f | 312 | |
f6fdbddf | 313 | buffer_clear(&msg); |
314 | ||
5061072f | 315 | return (rsa); |
316 | } | |
317 | ||
318 | static int | |
319 | hostjump(Key *hostkey) | |
320 | { | |
4278ff63 | 321 | kexjmp_key = hostkey; |
322 | longjmp(kexjmp, 1); | |
5061072f | 323 | } |
324 | ||
325 | static int | |
326 | ssh2_capable(int remote_major, int remote_minor) | |
327 | { | |
328 | switch (remote_major) { | |
329 | case 1: | |
330 | if (remote_minor == 99) | |
331 | return 1; | |
332 | break; | |
333 | case 2: | |
334 | return 1; | |
335 | default: | |
336 | break; | |
337 | } | |
338 | return 0; | |
339 | } | |
340 | ||
341 | static Key * | |
342 | keygrab_ssh2(con *c) | |
343 | { | |
344 | int j; | |
345 | ||
346 | packet_set_connection(c->c_fd, c->c_fd); | |
347 | enable_compat20(); | |
348 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA? | |
349 | "ssh-dss": "ssh-rsa"; | |
350 | c->c_kex = kex_setup(myproposal); | |
98a58eda | 351 | c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
352 | c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; | |
5061072f | 353 | c->c_kex->verify_host_key = hostjump; |
354 | ||
355 | if (!(j = setjmp(kexjmp))) { | |
356 | nonfatal_fatal = 1; | |
357 | dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex); | |
358 | fprintf(stderr, "Impossible! dispatch_run() returned!\n"); | |
359 | exit(1); | |
360 | } | |
361 | nonfatal_fatal = 0; | |
362 | xfree(c->c_kex); | |
363 | c->c_kex = NULL; | |
364 | packet_close(); | |
5061072f | 365 | |
4278ff63 | 366 | return j < 0? NULL : kexjmp_key; |
5061072f | 367 | } |
368 | ||
369 | static void | |
370 | keyprint(con *c, Key *key) | |
371 | { | |
372 | if (!key) | |
373 | return; | |
374 | ||
375 | fprintf(stdout, "%s ", c->c_output_name ? c->c_output_name : c->c_name); | |
376 | key_write(key, stdout); | |
f6fdbddf | 377 | fputs("\n", stdout); |
378 | } | |
379 | ||
396c147e | 380 | static int |
f6fdbddf | 381 | tcpconnect(char *host) |
382 | { | |
383 | struct addrinfo hints, *ai, *aitop; | |
384 | char strport[NI_MAXSERV]; | |
385 | int gaierr, s = -1; | |
386 | ||
5061072f | 387 | snprintf(strport, sizeof strport, "%d", ssh_port); |
f6fdbddf | 388 | memset(&hints, 0, sizeof(hints)); |
5061072f | 389 | hints.ai_family = IPv4or6; |
f6fdbddf | 390 | hints.ai_socktype = SOCK_STREAM; |
391 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) | |
392 | fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr)); | |
393 | for (ai = aitop; ai; ai = ai->ai_next) { | |
3e131a6d | 394 | s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
f6fdbddf | 395 | if (s < 0) { |
396 | error("socket: %s", strerror(errno)); | |
397 | continue; | |
398 | } | |
eea39c02 | 399 | if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) |
f6fdbddf | 400 | fatal("F_SETFL: %s", strerror(errno)); |
401 | if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 && | |
402 | errno != EINPROGRESS) | |
403 | error("connect (`%s'): %s", host, strerror(errno)); | |
404 | else | |
405 | break; | |
406 | close(s); | |
407 | s = -1; | |
408 | } | |
409 | freeaddrinfo(aitop); | |
410 | return s; | |
411 | } | |
412 | ||
396c147e | 413 | static int |
5061072f | 414 | conalloc(char *iname, char *oname, int keytype) |
f6fdbddf | 415 | { |
f6fdbddf | 416 | char *namebase, *name, *namelist; |
50d2fbbc | 417 | int s; |
f6fdbddf | 418 | |
419 | namebase = namelist = xstrdup(iname); | |
420 | ||
421 | do { | |
422 | name = xstrsep(&namelist, ","); | |
423 | if (!name) { | |
b5c334cc | 424 | xfree(namebase); |
f6fdbddf | 425 | return (-1); |
426 | } | |
427 | } while ((s = tcpconnect(name)) < 0); | |
428 | ||
429 | if (s >= maxfd) | |
227e8e86 | 430 | fatal("conalloc: fdno %d too high", s); |
f6fdbddf | 431 | if (fdcon[s].c_status) |
227e8e86 | 432 | fatal("conalloc: attempt to reuse fdno %d", s); |
f6fdbddf | 433 | |
434 | fdcon[s].c_fd = s; | |
435 | fdcon[s].c_status = CS_CON; | |
436 | fdcon[s].c_namebase = namebase; | |
437 | fdcon[s].c_name = name; | |
438 | fdcon[s].c_namelist = namelist; | |
439 | fdcon[s].c_output_name = xstrdup(oname); | |
440 | fdcon[s].c_data = (char *) &fdcon[s].c_plen; | |
441 | fdcon[s].c_len = 4; | |
442 | fdcon[s].c_off = 0; | |
5061072f | 443 | fdcon[s].c_keytype = keytype; |
f6fdbddf | 444 | gettimeofday(&fdcon[s].c_tv, NULL); |
445 | fdcon[s].c_tv.tv_sec += timeout; | |
446 | TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); | |
ff7fee59 | 447 | FD_SET(s, read_wait); |
f6fdbddf | 448 | ncon++; |
449 | return (s); | |
450 | } | |
451 | ||
396c147e | 452 | static void |
f6fdbddf | 453 | confree(int s) |
454 | { | |
f6fdbddf | 455 | if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) |
227e8e86 | 456 | fatal("confree: attempt to free bad fdno %d", s); |
2671b47f | 457 | close(s); |
b5c334cc | 458 | xfree(fdcon[s].c_namebase); |
459 | xfree(fdcon[s].c_output_name); | |
f6fdbddf | 460 | if (fdcon[s].c_status == CS_KEYS) |
b5c334cc | 461 | xfree(fdcon[s].c_data); |
f6fdbddf | 462 | fdcon[s].c_status = CS_UNUSED; |
5061072f | 463 | fdcon[s].c_keytype = 0; |
f6fdbddf | 464 | TAILQ_REMOVE(&tq, &fdcon[s], c_link); |
ff7fee59 | 465 | FD_CLR(s, read_wait); |
f6fdbddf | 466 | ncon--; |
467 | } | |
468 | ||
396c147e | 469 | static void |
f6fdbddf | 470 | contouch(int s) |
471 | { | |
472 | TAILQ_REMOVE(&tq, &fdcon[s], c_link); | |
473 | gettimeofday(&fdcon[s].c_tv, NULL); | |
474 | fdcon[s].c_tv.tv_sec += timeout; | |
475 | TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); | |
476 | } | |
477 | ||
396c147e | 478 | static int |
f6fdbddf | 479 | conrecycle(int s) |
480 | { | |
f6fdbddf | 481 | con *c = &fdcon[s]; |
50d2fbbc | 482 | int ret; |
f6fdbddf | 483 | |
5061072f | 484 | ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); |
f6fdbddf | 485 | confree(s); |
f6fdbddf | 486 | return (ret); |
487 | } | |
488 | ||
396c147e | 489 | static void |
f6fdbddf | 490 | congreet(int s) |
491 | { | |
b655d28c | 492 | int remote_major = 0, remote_minor = 0, n = 0; |
5061072f | 493 | char buf[256], *cp; |
cdc95d6e | 494 | char remote_version[sizeof buf]; |
c16c7f20 | 495 | size_t bufsiz; |
f6fdbddf | 496 | con *c = &fdcon[s]; |
497 | ||
c16c7f20 | 498 | bufsiz = sizeof(buf); |
499 | cp = buf; | |
578954b1 | 500 | while (bufsiz-- && (n = read(s, cp, 1)) == 1 && *cp != '\n') { |
501 | if (*cp == '\r') | |
502 | *cp = '\n'; | |
c16c7f20 | 503 | cp++; |
578954b1 | 504 | } |
f6fdbddf | 505 | if (n < 0) { |
506 | if (errno != ECONNREFUSED) | |
507 | error("read (%s): %s", c->c_name, strerror(errno)); | |
508 | conrecycle(s); | |
509 | return; | |
510 | } | |
27452401 | 511 | if (n == 0) { |
512 | error("%s: Connection closed by remote host", c->c_name); | |
513 | conrecycle(s); | |
514 | return; | |
515 | } | |
c16c7f20 | 516 | if (*cp != '\n' && *cp != '\r') { |
f6fdbddf | 517 | error("%s: bad greeting", c->c_name); |
518 | confree(s); | |
519 | return; | |
520 | } | |
c16c7f20 | 521 | *cp = '\0'; |
cdc95d6e | 522 | if (sscanf(buf, "SSH-%d.%d-%[^\n]\n", |
523 | &remote_major, &remote_minor, remote_version) == 3) | |
524 | compat_datafellows(remote_version); | |
525 | else | |
526 | datafellows = 0; | |
5061072f | 527 | if (c->c_keytype != KT_RSA1) { |
5061072f | 528 | if (!ssh2_capable(remote_major, remote_minor)) { |
529 | debug("%s doesn't support ssh2", c->c_name); | |
530 | confree(s); | |
531 | return; | |
532 | } | |
cdc95d6e | 533 | } else if (remote_major != 1) { |
534 | debug("%s doesn't support ssh1", c->c_name); | |
535 | confree(s); | |
536 | return; | |
5061072f | 537 | } |
578954b1 | 538 | fprintf(stderr, "# %s %s\n", c->c_name, chop(buf)); |
5061072f | 539 | n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", |
540 | c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2, | |
541 | c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2); | |
dc54438a | 542 | if (atomicio(vwrite, s, buf, n) != n) { |
f6fdbddf | 543 | error("write (%s): %s", c->c_name, strerror(errno)); |
544 | confree(s); | |
545 | return; | |
546 | } | |
5061072f | 547 | if (c->c_keytype != KT_RSA1) { |
548 | keyprint(c, keygrab_ssh2(c)); | |
549 | confree(s); | |
550 | return; | |
551 | } | |
f6fdbddf | 552 | c->c_status = CS_SIZE; |
553 | contouch(s); | |
554 | } | |
555 | ||
396c147e | 556 | static void |
f6fdbddf | 557 | conread(int s) |
558 | { | |
f6fdbddf | 559 | con *c = &fdcon[s]; |
50d2fbbc | 560 | int n; |
f6fdbddf | 561 | |
562 | if (c->c_status == CS_CON) { | |
563 | congreet(s); | |
564 | return; | |
565 | } | |
566 | n = read(s, c->c_data + c->c_off, c->c_len - c->c_off); | |
567 | if (n < 0) { | |
568 | error("read (%s): %s", c->c_name, strerror(errno)); | |
569 | confree(s); | |
570 | return; | |
571 | } | |
572 | c->c_off += n; | |
573 | ||
574 | if (c->c_off == c->c_len) | |
575 | switch (c->c_status) { | |
576 | case CS_SIZE: | |
577 | c->c_plen = htonl(c->c_plen); | |
578 | c->c_len = c->c_plen + 8 - (c->c_plen & 7); | |
579 | c->c_off = 0; | |
580 | c->c_data = xmalloc(c->c_len); | |
581 | c->c_status = CS_KEYS; | |
582 | break; | |
583 | case CS_KEYS: | |
5061072f | 584 | keyprint(c, keygrab_ssh1(c)); |
f6fdbddf | 585 | confree(s); |
586 | return; | |
587 | break; | |
588 | default: | |
227e8e86 | 589 | fatal("conread: invalid status %d", c->c_status); |
f6fdbddf | 590 | break; |
591 | } | |
592 | ||
593 | contouch(s); | |
594 | } | |
595 | ||
396c147e | 596 | static void |
f6fdbddf | 597 | conloop(void) |
598 | { | |
f6fdbddf | 599 | struct timeval seltime, now; |
50d2fbbc | 600 | fd_set *r, *e; |
f6fdbddf | 601 | con *c; |
50d2fbbc | 602 | int i; |
f6fdbddf | 603 | |
604 | gettimeofday(&now, NULL); | |
48ba8dc8 | 605 | c = TAILQ_FIRST(&tq); |
f6fdbddf | 606 | |
2671b47f | 607 | if (c && (c->c_tv.tv_sec > now.tv_sec || |
608 | (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) { | |
f6fdbddf | 609 | seltime = c->c_tv; |
610 | seltime.tv_sec -= now.tv_sec; | |
611 | seltime.tv_usec -= now.tv_usec; | |
5be2ec5e | 612 | if (seltime.tv_usec < 0) { |
f6fdbddf | 613 | seltime.tv_usec += 1000000; |
614 | seltime.tv_sec--; | |
615 | } | |
616 | } else | |
617 | seltime.tv_sec = seltime.tv_usec = 0; | |
618 | ||
ff7fee59 | 619 | r = xmalloc(read_wait_size); |
620 | memcpy(r, read_wait, read_wait_size); | |
621 | e = xmalloc(read_wait_size); | |
622 | memcpy(e, read_wait, read_wait_size); | |
623 | ||
624 | while (select(maxfd, r, NULL, e, &seltime) == -1 && | |
fd193ca4 | 625 | (errno == EAGAIN || errno == EINTR)) |
626 | ; | |
627 | ||
2671b47f | 628 | for (i = 0; i < maxfd; i++) { |
ff7fee59 | 629 | if (FD_ISSET(i, e)) { |
f6fdbddf | 630 | error("%s: exception!", fdcon[i].c_name); |
631 | confree(i); | |
ff7fee59 | 632 | } else if (FD_ISSET(i, r)) |
f6fdbddf | 633 | conread(i); |
2671b47f | 634 | } |
ff7fee59 | 635 | xfree(r); |
636 | xfree(e); | |
f6fdbddf | 637 | |
48ba8dc8 | 638 | c = TAILQ_FIRST(&tq); |
2671b47f | 639 | while (c && (c->c_tv.tv_sec < now.tv_sec || |
640 | (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) { | |
f6fdbddf | 641 | int s = c->c_fd; |
2671b47f | 642 | |
48ba8dc8 | 643 | c = TAILQ_NEXT(c, c_link); |
f6fdbddf | 644 | conrecycle(s); |
645 | } | |
646 | } | |
647 | ||
5061072f | 648 | static void |
649 | do_host(char *host) | |
f6fdbddf | 650 | { |
5061072f | 651 | char *name = strnnsep(&host, " \t\n"); |
652 | int j; | |
653 | ||
0408c978 | 654 | if (name == NULL) |
655 | return; | |
5061072f | 656 | for (j = KT_RSA1; j <= KT_RSA; j *= 2) { |
657 | if (get_keytypes & j) { | |
658 | while (ncon >= MAXCON) | |
659 | conloop(); | |
660 | conalloc(name, *host ? host : name, j); | |
f6fdbddf | 661 | } |
662 | } | |
663 | } | |
664 | ||
2bae80e9 | 665 | void |
666 | fatal(const char *fmt,...) | |
5061072f | 667 | { |
2bae80e9 | 668 | va_list args; |
50d2fbbc | 669 | |
2bae80e9 | 670 | va_start(args, fmt); |
671 | do_log(SYSLOG_LEVEL_FATAL, fmt, args); | |
672 | va_end(args); | |
5061072f | 673 | if (nonfatal_fatal) |
674 | longjmp(kexjmp, -1); | |
2bae80e9 | 675 | else |
eec6d341 | 676 | exit(255); |
5061072f | 677 | } |
678 | ||
396c147e | 679 | static void |
f6fdbddf | 680 | usage(void) |
681 | { | |
b9e5aff6 | 682 | fprintf(stderr, "usage: %s [-v46] [-p port] [-T timeout] [-t type] [-f file]\n" |
50d2fbbc | 683 | "\t\t [host | addrlist namelist] [...]\n", |
33e766d2 | 684 | __progname); |
33e766d2 | 685 | exit(1); |
f6fdbddf | 686 | } |
687 | ||
688 | int | |
689 | main(int argc, char **argv) | |
690 | { | |
5061072f | 691 | int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; |
692 | int opt, fopt_count = 0; | |
693 | char *tname; | |
a204806b | 694 | |
5061072f | 695 | extern int optind; |
696 | extern char *optarg; | |
f6fdbddf | 697 | |
fda04d7d | 698 | __progname = ssh_get_progname(argv[0]); |
8782141f | 699 | init_rng(); |
700 | seed_rng(); | |
f6fdbddf | 701 | TAILQ_INIT(&tq); |
702 | ||
5061072f | 703 | if (argc <= 1) |
f6fdbddf | 704 | usage(); |
705 | ||
5061072f | 706 | while ((opt = getopt(argc, argv, "v46p:T:t:f:")) != -1) { |
707 | switch (opt) { | |
708 | case 'p': | |
709 | ssh_port = a2port(optarg); | |
710 | if (ssh_port == 0) { | |
711 | fprintf(stderr, "Bad port '%s'\n", optarg); | |
712 | exit(1); | |
713 | } | |
714 | break; | |
715 | case 'T': | |
c8f94200 | 716 | timeout = convtime(optarg); |
717 | if (timeout == -1 || timeout == 0) { | |
718 | fprintf(stderr, "Bad timeout '%s'\n", optarg); | |
f6fdbddf | 719 | usage(); |
c8f94200 | 720 | } |
5061072f | 721 | break; |
722 | case 'v': | |
723 | if (!debug_flag) { | |
724 | debug_flag = 1; | |
725 | log_level = SYSLOG_LEVEL_DEBUG1; | |
726 | } | |
727 | else if (log_level < SYSLOG_LEVEL_DEBUG3) | |
728 | log_level++; | |
729 | else | |
730 | fatal("Too high debugging level."); | |
731 | break; | |
a204806b | 732 | case 'f': |
5061072f | 733 | if (strcmp(optarg, "-") == 0) |
734 | optarg = NULL; | |
735 | argv[fopt_count++] = optarg; | |
736 | break; | |
737 | case 't': | |
738 | get_keytypes = 0; | |
739 | tname = strtok(optarg, ","); | |
740 | while (tname) { | |
741 | int type = key_type_from_name(tname); | |
742 | switch (type) { | |
743 | case KEY_RSA1: | |
744 | get_keytypes |= KT_RSA1; | |
745 | break; | |
746 | case KEY_DSA: | |
747 | get_keytypes |= KT_DSA; | |
748 | break; | |
749 | case KEY_RSA: | |
750 | get_keytypes |= KT_RSA; | |
751 | break; | |
752 | case KEY_UNSPEC: | |
f48e63c8 | 753 | fatal("unknown key type %s", tname); |
5061072f | 754 | } |
755 | tname = strtok(NULL, ","); | |
756 | } | |
757 | break; | |
758 | case '4': | |
759 | IPv4or6 = AF_INET; | |
760 | break; | |
761 | case '6': | |
762 | IPv4or6 = AF_INET6; | |
763 | break; | |
764 | case '?': | |
765 | default: | |
f6fdbddf | 766 | usage(); |
5061072f | 767 | } |
f6fdbddf | 768 | } |
5061072f | 769 | if (optind == argc && !fopt_count) |
f6fdbddf | 770 | usage(); |
771 | ||
5061072f | 772 | log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); |
5061072f | 773 | |
f6fdbddf | 774 | maxfd = fdlim_get(1); |
775 | if (maxfd < 0) | |
227e8e86 | 776 | fatal("%s: fdlim_get: bad value", __progname); |
f6fdbddf | 777 | if (maxfd > MAXMAXFD) |
778 | maxfd = MAXMAXFD; | |
2671b47f | 779 | if (MAXCON <= 0) |
227e8e86 | 780 | fatal("%s: not enough file descriptors", __progname); |
f6fdbddf | 781 | if (maxfd > fdlim_get(0)) |
782 | fdlim_set(maxfd); | |
783 | fdcon = xmalloc(maxfd * sizeof(con)); | |
5be2ec5e | 784 | memset(fdcon, 0, maxfd * sizeof(con)); |
f6fdbddf | 785 | |
ff7fee59 | 786 | read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask); |
787 | read_wait = xmalloc(read_wait_size); | |
788 | memset(read_wait, 0, read_wait_size); | |
789 | ||
5061072f | 790 | if (fopt_count) { |
791 | Linebuf *lb; | |
792 | char *line; | |
793 | int j; | |
794 | ||
795 | for (j = 0; j < fopt_count; j++) { | |
796 | lb = Linebuf_alloc(argv[j], error); | |
b7f79e7a | 797 | if (!lb) |
798 | continue; | |
5061072f | 799 | while ((line = Linebuf_getline(lb)) != NULL) |
800 | do_host(line); | |
801 | Linebuf_free(lb); | |
f6fdbddf | 802 | } |
5061072f | 803 | } |
804 | ||
805 | while (optind < argc) | |
806 | do_host(argv[optind++]); | |
807 | ||
f6fdbddf | 808 | while (ncon > 0) |
809 | conloop(); | |
810 | ||
811 | return (0); | |
812 | } |