1 /* $OpenBSD: ssh-keyscan.c,v 1.138 2020/12/29 00:59:15 djm Exp $ */
2 /*
3 * Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>.
4 *
5 * Modification and redistribution in source and binary forms is
6 * permitted provided that due credit is given to the author and the
7 * OpenBSD project by leaving this copyright notice intact.
8 */
9
10 #include "includes.h"
11
12 #include <sys/types.h>
13 #include "openbsd-compat/sys-queue.h"
14 #include <sys/resource.h>
15 #ifdef HAVE_SYS_TIME_H
16 # include <sys/time.h>
17 #endif
18
19 #include <netinet/in.h>
20 #include <arpa/inet.h>
21
22 #ifdef WITH_OPENSSL
23 #include <openssl/bn.h>
24 #endif
25
26 #include <netdb.h>
27 #include <errno.h>
28 #include <stdarg.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <signal.h>
32 #include <string.h>
33 #include <unistd.h>
34
35 #include "xmalloc.h"
36 #include "ssh.h"
37 #include "sshbuf.h"
38 #include "sshkey.h"
39 #include "cipher.h"
40 #include "kex.h"
41 #include "compat.h"
42 #include "myproposal.h"
43 #include "packet.h"
44 #include "dispatch.h"
45 #include "log.h"
46 #include "atomicio.h"
47 #include "misc.h"
48 #include "hostfile.h"
49 #include "ssherr.h"
50 #include "ssh_api.h"
51 #include "dns.h"
52
53 /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
54 Default value is AF_UNSPEC means both IPv4 and IPv6. */
55 int IPv4or6 = AF_UNSPEC;
56
57 int ssh_port = SSH_DEFAULT_PORT;
58
59 #define KT_DSA (1)
60 #define KT_RSA (1<<1)
61 #define KT_ECDSA (1<<2)
62 #define KT_ED25519 (1<<3)
63 #define KT_XMSS (1<<4)
64 #define KT_ECDSA_SK (1<<5)
65 #define KT_ED25519_SK (1<<6)
66
67 #define KT_MIN KT_DSA
68 #define KT_MAX KT_ED25519_SK
69
70 int get_cert = 0;
71 int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519|KT_ECDSA_SK|KT_ED25519_SK;
72
73 int hash_hosts = 0; /* Hash hostname on output */
74
75 int print_sshfp = 0; /* Print SSHFP records instead of known_hosts */
76
77 int found_one = 0; /* Successfully found a key */
78
79 #define MAXMAXFD 256
80
81 /* The number of seconds after which to give up on a TCP connection */
82 int timeout = 5;
83
84 int maxfd;
85 #define MAXCON (maxfd - 10)
86
87 extern char *__progname;
88 fd_set *read_wait;
89 size_t read_wait_nfdset;
90 int ncon;
91
92 /*
93 * Keep a connection structure for each file descriptor. The state
94 * associated with file descriptor n is held in fdcon[n].
95 */
96 typedef struct Connection {
97 u_char c_status; /* State of connection on this file desc. */
98 #define CS_UNUSED 0 /* File descriptor unused */
99 #define CS_CON 1 /* Waiting to connect/read greeting */
100 #define CS_SIZE 2 /* Waiting to read initial packet size */
101 #define CS_KEYS 3 /* Waiting to read public key packet */
102 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
103 int c_plen; /* Packet length field for ssh packet */
104 int c_len; /* Total bytes which must be read. */
105 int c_off; /* Length of data read so far. */
106 int c_keytype; /* Only one of KT_* */
107 sig_atomic_t c_done; /* SSH2 done */
108 char *c_namebase; /* Address to free for c_name and c_namelist */
109 char *c_name; /* Hostname of connection for errors */
110 char *c_namelist; /* Pointer to other possible addresses */
111 char *c_output_name; /* Hostname of connection for output */
112 char *c_data; /* Data read from this fd */
113 struct ssh *c_ssh; /* SSH-connection */
114 struct timeval c_tv; /* Time at which connection gets aborted */
115 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
116 } con;
117
118 TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
119 con *fdcon;
120
121 static void keyprint(con *c, struct sshkey *key);
122
123 static int
fdlim_get(int hard)124 fdlim_get(int hard)
125 {
126 #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
127 struct rlimit rlfd;
128
129 if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1)
130 return (-1);
131 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
132 return SSH_SYSFDMAX;
133 else
134 return hard ? rlfd.rlim_max : rlfd.rlim_cur;
135 #else
136 return SSH_SYSFDMAX;
137 #endif
138 }
139
140 static int
fdlim_set(int lim)141 fdlim_set(int lim)
142 {
143 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
144 struct rlimit rlfd;
145 #endif
146
147 if (lim <= 0)
148 return (-1);
149 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
150 if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1)
151 return (-1);
152 rlfd.rlim_cur = lim;
153 if (setrlimit(RLIMIT_NOFILE, &rlfd) == -1)
154 return (-1);
155 #elif defined (HAVE_SETDTABLESIZE)
156 setdtablesize(lim);
157 #endif
158 return (0);
159 }
160
161 /*
162 * This is an strsep function that returns a null field for adjacent
163 * separators. This is the same as the 4.4BSD strsep, but different from the
164 * one in the GNU libc.
165 */
166 static char *
xstrsep(char ** str,const char * delim)167 xstrsep(char **str, const char *delim)
168 {
169 char *s, *e;
170
171 if (!**str)
172 return (NULL);
173
174 s = *str;
175 e = s + strcspn(s, delim);
176
177 if (*e != '\0')
178 *e++ = '\0';
179 *str = e;
180
181 return (s);
182 }
183
184 /*
185 * Get the next non-null token (like GNU strsep). Strsep() will return a
186 * null token for two adjacent separators, so we may have to loop.
187 */
188 static char *
strnnsep(char ** stringp,char * delim)189 strnnsep(char **stringp, char *delim)
190 {
191 char *tok;
192
193 do {
194 tok = xstrsep(stringp, delim);
195 } while (tok && *tok == '\0');
196 return (tok);
197 }
198
199
200 static int
key_print_wrapper(struct sshkey * hostkey,struct ssh * ssh)201 key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh)
202 {
203 con *c;
204
205 if ((c = ssh_get_app_data(ssh)) != NULL)
206 keyprint(c, hostkey);
207 /* always abort key exchange */
208 return -1;
209 }
210
211 static int
ssh2_capable(int remote_major,int remote_minor)212 ssh2_capable(int remote_major, int remote_minor)
213 {
214 switch (remote_major) {
215 case 1:
216 if (remote_minor == 99)
217 return 1;
218 break;
219 case 2:
220 return 1;
221 default:
222 break;
223 }
224 return 0;
225 }
226
227 static void
keygrab_ssh2(con * c)228 keygrab_ssh2(con *c)
229 {
230 char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
231 int r;
232
233 switch (c->c_keytype) {
234 case KT_DSA:
235 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
236 "ssh-dss-cert-v01@openssh.com" : "ssh-dss";
237 break;
238 case KT_RSA:
239 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
240 "rsa-sha2-512-cert-v01@openssh.com,"
241 "rsa-sha2-256-cert-v01@openssh.com,"
242 "ssh-rsa-cert-v01@openssh.com" :
243 "rsa-sha2-512,"
244 "rsa-sha2-256,"
245 "ssh-rsa";
246 break;
247 case KT_ED25519:
248 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
249 "ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519";
250 break;
251 case KT_XMSS:
252 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
253 "ssh-xmss-cert-v01@openssh.com" : "ssh-xmss@openssh.com";
254 break;
255 case KT_ECDSA:
256 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
257 "ecdsa-sha2-nistp256-cert-v01@openssh.com,"
258 "ecdsa-sha2-nistp384-cert-v01@openssh.com,"
259 "ecdsa-sha2-nistp521-cert-v01@openssh.com" :
260 "ecdsa-sha2-nistp256,"
261 "ecdsa-sha2-nistp384,"
262 "ecdsa-sha2-nistp521";
263 break;
264 case KT_ECDSA_SK:
265 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
266 "sk-ecdsa-sha2-nistp256-cert-v01@openssh.com" :
267 "sk-ecdsa-sha2-nistp256@openssh.com";
268 break;
269 case KT_ED25519_SK:
270 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
271 "sk-ssh-ed25519-cert-v01@openssh.com" :
272 "sk-ssh-ed25519@openssh.com";
273 break;
274 default:
275 fatal("unknown key type %d", c->c_keytype);
276 break;
277 }
278 if ((r = kex_setup(c->c_ssh, myproposal)) != 0) {
279 free(c->c_ssh);
280 fprintf(stderr, "kex_setup: %s\n", ssh_err(r));
281 exit(1);
282 }
283 #ifdef WITH_OPENSSL
284 c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_client;
285 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_client;
286 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_client;
287 c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_client;
288 c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_client;
289 c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
290 c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
291 # ifdef OPENSSL_HAS_ECC
292 c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kex_gen_client;
293 # endif
294 #endif
295 c->c_ssh->kex->kex[KEX_C25519_SHA256] = kex_gen_client;
296 c->c_ssh->kex->kex[KEX_KEM_SNTRUP761X25519_SHA512] = kex_gen_client;
297 ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper);
298 /*
299 * do the key-exchange until an error occurs or until
300 * the key_print_wrapper() callback sets c_done.
301 */
302 ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done);
303 }
304
305 static void
keyprint_one(const char * host,struct sshkey * key)306 keyprint_one(const char *host, struct sshkey *key)
307 {
308 char *hostport;
309 const char *known_host, *hashed;
310
311 found_one = 1;
312
313 if (print_sshfp) {
314 export_dns_rr(host, key, stdout, 0);
315 return;
316 }
317
318 hostport = put_host_port(host, ssh_port);
319 lowercase(hostport);
320 if (hash_hosts && (hashed = host_hash(host, NULL, 0)) == NULL)
321 fatal("host_hash failed");
322 known_host = hash_hosts ? hashed : hostport;
323 if (!get_cert)
324 fprintf(stdout, "%s ", known_host);
325 sshkey_write(key, stdout);
326 fputs("\n", stdout);
327 free(hostport);
328 }
329
330 static void
keyprint(con * c,struct sshkey * key)331 keyprint(con *c, struct sshkey *key)
332 {
333 char *hosts = c->c_output_name ? c->c_output_name : c->c_name;
334 char *host, *ohosts;
335
336 if (key == NULL)
337 return;
338 if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) {
339 keyprint_one(hosts, key);
340 return;
341 }
342 ohosts = hosts = xstrdup(hosts);
343 while ((host = strsep(&hosts, ",")) != NULL)
344 keyprint_one(host, key);
345 free(ohosts);
346 }
347
348 static int
tcpconnect(char * host)349 tcpconnect(char *host)
350 {
351 struct addrinfo hints, *ai, *aitop;
352 char strport[NI_MAXSERV];
353 int gaierr, s = -1;
354
355 snprintf(strport, sizeof strport, "%d", ssh_port);
356 memset(&hints, 0, sizeof(hints));
357 hints.ai_family = IPv4or6;
358 hints.ai_socktype = SOCK_STREAM;
359 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
360 error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
361 return -1;
362 }
363 for (ai = aitop; ai; ai = ai->ai_next) {
364 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
365 if (s == -1) {
366 error("socket: %s", strerror(errno));
367 continue;
368 }
369 if (set_nonblock(s) == -1)
370 fatal_f("set_nonblock(%d)", s);
371 if (connect(s, ai->ai_addr, ai->ai_addrlen) == -1 &&
372 errno != EINPROGRESS)
373 error("connect (`%s'): %s", host, strerror(errno));
374 else
375 break;
376 close(s);
377 s = -1;
378 }
379 freeaddrinfo(aitop);
380 return s;
381 }
382
383 static int
conalloc(char * iname,char * oname,int keytype)384 conalloc(char *iname, char *oname, int keytype)
385 {
386 char *namebase, *name, *namelist;
387 int s;
388
389 namebase = namelist = xstrdup(iname);
390
391 do {
392 name = xstrsep(&namelist, ",");
393 if (!name) {
394 free(namebase);
395 return (-1);
396 }
397 } while ((s = tcpconnect(name)) < 0);
398
399 if (s >= maxfd)
400 fatal("conalloc: fdno %d too high", s);
401 if (fdcon[s].c_status)
402 fatal("conalloc: attempt to reuse fdno %d", s);
403
404 debug3_f("oname %s kt %d", oname, keytype);
405 fdcon[s].c_fd = s;
406 fdcon[s].c_status = CS_CON;
407 fdcon[s].c_namebase = namebase;
408 fdcon[s].c_name = name;
409 fdcon[s].c_namelist = namelist;
410 fdcon[s].c_output_name = xstrdup(oname);
411 fdcon[s].c_data = (char *) &fdcon[s].c_plen;
412 fdcon[s].c_len = 4;
413 fdcon[s].c_off = 0;
414 fdcon[s].c_keytype = keytype;
415 monotime_tv(&fdcon[s].c_tv);
416 fdcon[s].c_tv.tv_sec += timeout;
417 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
418 FD_SET(s, read_wait);
419 ncon++;
420 return (s);
421 }
422
423 static void
confree(int s)424 confree(int s)
425 {
426 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
427 fatal("confree: attempt to free bad fdno %d", s);
428 free(fdcon[s].c_namebase);
429 free(fdcon[s].c_output_name);
430 if (fdcon[s].c_status == CS_KEYS)
431 free(fdcon[s].c_data);
432 fdcon[s].c_status = CS_UNUSED;
433 fdcon[s].c_keytype = 0;
434 if (fdcon[s].c_ssh) {
435 ssh_packet_close(fdcon[s].c_ssh);
436 free(fdcon[s].c_ssh);
437 fdcon[s].c_ssh = NULL;
438 } else
439 close(s);
440 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
441 FD_CLR(s, read_wait);
442 ncon--;
443 }
444
445 static void
contouch(int s)446 contouch(int s)
447 {
448 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
449 monotime_tv(&fdcon[s].c_tv);
450 fdcon[s].c_tv.tv_sec += timeout;
451 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
452 }
453
454 static int
conrecycle(int s)455 conrecycle(int s)
456 {
457 con *c = &fdcon[s];
458 int ret;
459
460 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
461 confree(s);
462 return (ret);
463 }
464
465 static void
congreet(int s)466 congreet(int s)
467 {
468 int n = 0, remote_major = 0, remote_minor = 0;
469 char buf[256], *cp;
470 char remote_version[sizeof buf];
471 size_t bufsiz;
472 con *c = &fdcon[s];
473
474 /* send client banner */
475 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
476 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2);
477 if (n < 0 || (size_t)n >= sizeof(buf)) {
478 error("snprintf: buffer too small");
479 confree(s);
480 return;
481 }
482 if (atomicio(vwrite, s, buf, n) != (size_t)n) {
483 error("write (%s): %s", c->c_name, strerror(errno));
484 confree(s);
485 return;
486 }
487
488 for (;;) {
489 memset(buf, '\0', sizeof(buf));
490 bufsiz = sizeof(buf);
491 cp = buf;
492 while (bufsiz-- &&
493 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
494 if (*cp == '\r')
495 *cp = '\n';
496 cp++;
497 }
498 if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
499 break;
500 }
501 if (n == 0) {
502 switch (errno) {
503 case EPIPE:
504 error("%s: Connection closed by remote host", c->c_name);
505 break;
506 case ECONNREFUSED:
507 break;
508 default:
509 error("read (%s): %s", c->c_name, strerror(errno));
510 break;
511 }
512 conrecycle(s);
513 return;
514 }
515 if (*cp != '\n' && *cp != '\r') {
516 error("%s: bad greeting", c->c_name);
517 confree(s);
518 return;
519 }
520 *cp = '\0';
521 if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL)
522 fatal("ssh_packet_set_connection failed");
523 ssh_packet_set_timeout(c->c_ssh, timeout, 1);
524 ssh_set_app_data(c->c_ssh, c); /* back link */
525 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
526 &remote_major, &remote_minor, remote_version) == 3)
527 c->c_ssh->compat = compat_datafellows(remote_version);
528 else
529 c->c_ssh->compat = 0;
530 if (!ssh2_capable(remote_major, remote_minor)) {
531 debug("%s doesn't support ssh2", c->c_name);
532 confree(s);
533 return;
534 }
535 fprintf(stderr, "%c %s:%d %s\n", print_sshfp ? ';' : '#',
536 c->c_name, ssh_port, chop(buf));
537 keygrab_ssh2(c);
538 confree(s);
539 }
540
541 static void
conread(int s)542 conread(int s)
543 {
544 con *c = &fdcon[s];
545 size_t n;
546
547 if (c->c_status == CS_CON) {
548 congreet(s);
549 return;
550 }
551 n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
552 if (n == 0) {
553 error("read (%s): %s", c->c_name, strerror(errno));
554 confree(s);
555 return;
556 }
557 c->c_off += n;
558
559 if (c->c_off == c->c_len)
560 switch (c->c_status) {
561 case CS_SIZE:
562 c->c_plen = htonl(c->c_plen);
563 c->c_len = c->c_plen + 8 - (c->c_plen & 7);
564 c->c_off = 0;
565 c->c_data = xmalloc(c->c_len);
566 c->c_status = CS_KEYS;
567 break;
568 default:
569 fatal("conread: invalid status %d", c->c_status);
570 break;
571 }
572
573 contouch(s);
574 }
575
576 static void
conloop(void)577 conloop(void)
578 {
579 struct timeval seltime, now;
580 fd_set *r, *e;
581 con *c;
582 int i;
583
584 monotime_tv(&now);
585 c = TAILQ_FIRST(&tq);
586
587 if (c && timercmp(&c->c_tv, &now, >))
588 timersub(&c->c_tv, &now, &seltime);
589 else
590 timerclear(&seltime);
591
592 r = xcalloc(read_wait_nfdset, sizeof(fd_mask));
593 e = xcalloc(read_wait_nfdset, sizeof(fd_mask));
594 memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask));
595 memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask));
596
597 while (select(maxfd, r, NULL, e, &seltime) == -1 &&
598 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
599 ;
600
601 for (i = 0; i < maxfd; i++) {
602 if (FD_ISSET(i, e)) {
603 error("%s: exception!", fdcon[i].c_name);
604 confree(i);
605 } else if (FD_ISSET(i, r))
606 conread(i);
607 }
608 free(r);
609 free(e);
610
611 c = TAILQ_FIRST(&tq);
612 while (c && timercmp(&c->c_tv, &now, <)) {
613 int s = c->c_fd;
614
615 c = TAILQ_NEXT(c, c_link);
616 conrecycle(s);
617 }
618 }
619
620 static void
do_host(char * host)621 do_host(char *host)
622 {
623 char *name = strnnsep(&host, " \t\n");
624 int j;
625
626 if (name == NULL)
627 return;
628 for (j = KT_MIN; j <= KT_MAX; j *= 2) {
629 if (get_keytypes & j) {
630 while (ncon >= MAXCON)
631 conloop();
632 conalloc(name, *host ? host : name, j);
633 }
634 }
635 }
636
637 void
sshfatal(const char * file,const char * func,int line,int showfunc,LogLevel level,const char * suffix,const char * fmt,...)638 sshfatal(const char *file, const char *func, int line, int showfunc,
639 LogLevel level, const char *suffix, const char *fmt, ...)
640 {
641 va_list args;
642
643 va_start(args, fmt);
644 sshlogv(file, func, line, showfunc, level, suffix, fmt, args);
645 va_end(args);
646 cleanup_exit(255);
647 }
648
649 static void
usage(void)650 usage(void)
651 {
652 fprintf(stderr,
653 "usage: %s [-46cDHv] [-f file] [-p port] [-T timeout] [-t type]\n"
654 "\t\t [host | addrlist namelist]\n",
655 __progname);
656 exit(1);
657 }
658
659 int
main(int argc,char ** argv)660 main(int argc, char **argv)
661 {
662 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
663 int opt, fopt_count = 0, j;
664 char *tname, *cp, *line = NULL;
665 size_t linesize = 0;
666 FILE *fp;
667
668 extern int optind;
669 extern char *optarg;
670
671 __progname = ssh_get_progname(argv[0]);
672 seed_rng();
673 TAILQ_INIT(&tq);
674
675 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
676 sanitise_stdfd();
677
678 if (argc <= 1)
679 usage();
680
681 while ((opt = getopt(argc, argv, "cDHv46p:T:t:f:")) != -1) {
682 switch (opt) {
683 case 'H':
684 hash_hosts = 1;
685 break;
686 case 'c':
687 get_cert = 1;
688 break;
689 case 'D':
690 print_sshfp = 1;
691 break;
692 case 'p':
693 ssh_port = a2port(optarg);
694 if (ssh_port <= 0) {
695 fprintf(stderr, "Bad port '%s'\n", optarg);
696 exit(1);
697 }
698 break;
699 case 'T':
700 timeout = convtime(optarg);
701 if (timeout == -1 || timeout == 0) {
702 fprintf(stderr, "Bad timeout '%s'\n", optarg);
703 usage();
704 }
705 break;
706 case 'v':
707 if (!debug_flag) {
708 debug_flag = 1;
709 log_level = SYSLOG_LEVEL_DEBUG1;
710 }
711 else if (log_level < SYSLOG_LEVEL_DEBUG3)
712 log_level++;
713 else
714 fatal("Too high debugging level.");
715 break;
716 case 'f':
717 if (strcmp(optarg, "-") == 0)
718 optarg = NULL;
719 argv[fopt_count++] = optarg;
720 break;
721 case 't':
722 get_keytypes = 0;
723 tname = strtok(optarg, ",");
724 while (tname) {
725 int type = sshkey_type_from_name(tname);
726
727 switch (type) {
728 case KEY_DSA:
729 get_keytypes |= KT_DSA;
730 break;
731 case KEY_ECDSA:
732 get_keytypes |= KT_ECDSA;
733 break;
734 case KEY_RSA:
735 get_keytypes |= KT_RSA;
736 break;
737 case KEY_ED25519:
738 get_keytypes |= KT_ED25519;
739 break;
740 case KEY_XMSS:
741 get_keytypes |= KT_XMSS;
742 break;
743 case KEY_ED25519_SK:
744 get_keytypes |= KT_ED25519_SK;
745 break;
746 case KEY_ECDSA_SK:
747 get_keytypes |= KT_ECDSA_SK;
748 break;
749 case KEY_UNSPEC:
750 default:
751 fatal("Unknown key type \"%s\"", tname);
752 }
753 tname = strtok(NULL, ",");
754 }
755 break;
756 case '4':
757 IPv4or6 = AF_INET;
758 break;
759 case '6':
760 IPv4or6 = AF_INET6;
761 break;
762 case '?':
763 default:
764 usage();
765 }
766 }
767 if (optind == argc && !fopt_count)
768 usage();
769
770 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
771
772 maxfd = fdlim_get(1);
773 if (maxfd < 0)
774 fatal("%s: fdlim_get: bad value", __progname);
775 if (maxfd > MAXMAXFD)
776 maxfd = MAXMAXFD;
777 if (MAXCON <= 0)
778 fatal("%s: not enough file descriptors", __progname);
779 if (maxfd > fdlim_get(0))
780 fdlim_set(maxfd);
781 fdcon = xcalloc(maxfd, sizeof(con));
782
783 read_wait_nfdset = howmany(maxfd, NFDBITS);
784 read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));
785
786 for (j = 0; j < fopt_count; j++) {
787 if (argv[j] == NULL)
788 fp = stdin;
789 else if ((fp = fopen(argv[j], "r")) == NULL)
790 fatal("%s: %s: %s", __progname, argv[j], strerror(errno));
791
792 while (getline(&line, &linesize, fp) != -1) {
793 /* Chomp off trailing whitespace and comments */
794 if ((cp = strchr(line, '#')) == NULL)
795 cp = line + strlen(line) - 1;
796 while (cp >= line) {
797 if (*cp == ' ' || *cp == '\t' ||
798 *cp == '\n' || *cp == '#')
799 *cp-- = '\0';
800 else
801 break;
802 }
803
804 /* Skip empty lines */
805 if (*line == '\0')
806 continue;
807
808 do_host(line);
809 }
810
811 if (ferror(fp))
812 fatal("%s: %s: %s", __progname, argv[j], strerror(errno));
813
814 fclose(fp);
815 }
816 free(line);
817
818 while (optind < argc)
819 do_host(argv[optind++]);
820
821 while (ncon > 0)
822 conloop();
823
824 return found_one ? 0 : 1;
825 }
826