1 /* $OpenBSD: ssh-keyscan.c,v 1.158 2024/06/14 00:25:25 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 <limits.h>
27 #include <netdb.h>
28 #include <errno.h>
29 #ifdef HAVE_POLL_H
30 #include <poll.h>
31 #endif
32 #include <stdarg.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <signal.h>
36 #include <string.h>
37 #include <unistd.h>
38
39 #include "xmalloc.h"
40 #include "ssh.h"
41 #include "sshbuf.h"
42 #include "sshkey.h"
43 #include "cipher.h"
44 #include "digest.h"
45 #include "kex.h"
46 #include "compat.h"
47 #include "myproposal.h"
48 #include "packet.h"
49 #include "dispatch.h"
50 #include "log.h"
51 #include "atomicio.h"
52 #include "misc.h"
53 #include "hostfile.h"
54 #include "ssherr.h"
55 #include "ssh_api.h"
56 #include "dns.h"
57 #include "addr.h"
58
59 /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
60 Default value is AF_UNSPEC means both IPv4 and IPv6. */
61 int IPv4or6 = AF_UNSPEC;
62
63 int ssh_port = SSH_DEFAULT_PORT;
64
65 #define KT_DSA (1)
66 #define KT_RSA (1<<1)
67 #define KT_ECDSA (1<<2)
68 #define KT_ED25519 (1<<3)
69 #define KT_XMSS (1<<4)
70 #define KT_ECDSA_SK (1<<5)
71 #define KT_ED25519_SK (1<<6)
72
73 #define KT_MIN KT_DSA
74 #define KT_MAX KT_ED25519_SK
75
76 int get_cert = 0;
77 int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519|KT_ECDSA_SK|KT_ED25519_SK;
78
79 int hash_hosts = 0; /* Hash hostname on output */
80
81 int print_sshfp = 0; /* Print SSHFP records instead of known_hosts */
82
83 int found_one = 0; /* Successfully found a key */
84
85 int hashalg = -1; /* Hash for SSHFP records or -1 for all */
86
87 int quiet = 0; /* Don't print key comment lines */
88
89 #define MAXMAXFD 256
90
91 /* The number of seconds after which to give up on a TCP connection */
92 int timeout = 5;
93
94 int maxfd;
95 #define MAXCON (maxfd - 10)
96
97 extern char *__progname;
98 struct pollfd *read_wait;
99 int ncon;
100
101 /*
102 * Keep a connection structure for each file descriptor. The state
103 * associated with file descriptor n is held in fdcon[n].
104 */
105 typedef struct Connection {
106 u_char c_status; /* State of connection on this file desc. */
107 #define CS_UNUSED 0 /* File descriptor unused */
108 #define CS_CON 1 /* Waiting to connect/read greeting */
109 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
110 int c_keytype; /* Only one of KT_* */
111 sig_atomic_t c_done; /* SSH2 done */
112 char *c_namebase; /* Address to free for c_name and c_namelist */
113 char *c_name; /* Hostname of connection for errors */
114 char *c_namelist; /* Pointer to other possible addresses */
115 char *c_output_name; /* Hostname of connection for output */
116 struct ssh *c_ssh; /* SSH-connection */
117 struct timespec c_ts; /* Time at which connection gets aborted */
118 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
119 } con;
120
121 TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
122 con *fdcon;
123
124 static void keyprint(con *c, struct sshkey *key);
125
126 static int
fdlim_get(int hard)127 fdlim_get(int hard)
128 {
129 #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
130 struct rlimit rlfd;
131 rlim_t lim;
132
133 if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1)
134 return -1;
135 lim = hard ? rlfd.rlim_max : rlfd.rlim_cur;
136 if (lim <= 0)
137 return -1;
138 if (lim == RLIM_INFINITY)
139 lim = SSH_SYSFDMAX;
140 if (lim >= INT_MAX)
141 lim = INT_MAX;
142 return lim;
143 #else
144 return (SSH_SYSFDMAX <= 0) ? -1 :
145 ((SSH_SYSFDMAX >= INT_MAX) ? INT_MAX : SSH_SYSFDMAX);
146 #endif
147 }
148
149 static int
fdlim_set(int lim)150 fdlim_set(int lim)
151 {
152 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
153 struct rlimit rlfd;
154 #endif
155
156 if (lim <= 0)
157 return (-1);
158 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
159 if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1)
160 return (-1);
161 rlfd.rlim_cur = lim;
162 if (setrlimit(RLIMIT_NOFILE, &rlfd) == -1)
163 return (-1);
164 #elif defined (HAVE_SETDTABLESIZE)
165 setdtablesize(lim);
166 #endif
167 return (0);
168 }
169
170 /*
171 * This is an strsep function that returns a null field for adjacent
172 * separators. This is the same as the 4.4BSD strsep, but different from the
173 * one in the GNU libc.
174 */
175 static char *
xstrsep(char ** str,const char * delim)176 xstrsep(char **str, const char *delim)
177 {
178 char *s, *e;
179
180 if (!**str)
181 return (NULL);
182
183 s = *str;
184 e = s + strcspn(s, delim);
185
186 if (*e != '\0')
187 *e++ = '\0';
188 *str = e;
189
190 return (s);
191 }
192
193 /*
194 * Get the next non-null token (like GNU strsep). Strsep() will return a
195 * null token for two adjacent separators, so we may have to loop.
196 */
197 static char *
strnnsep(char ** stringp,char * delim)198 strnnsep(char **stringp, char *delim)
199 {
200 char *tok;
201
202 do {
203 tok = xstrsep(stringp, delim);
204 } while (tok && *tok == '\0');
205 return (tok);
206 }
207
208
209 static int
key_print_wrapper(struct sshkey * hostkey,struct ssh * ssh)210 key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh)
211 {
212 con *c;
213
214 if ((c = ssh_get_app_data(ssh)) != NULL)
215 keyprint(c, hostkey);
216 /* always abort key exchange */
217 return -1;
218 }
219
220 static int
ssh2_capable(int remote_major,int remote_minor)221 ssh2_capable(int remote_major, int remote_minor)
222 {
223 switch (remote_major) {
224 case 1:
225 if (remote_minor == 99)
226 return 1;
227 break;
228 case 2:
229 return 1;
230 default:
231 break;
232 }
233 return 0;
234 }
235
236 static void
keygrab_ssh2(con * c)237 keygrab_ssh2(con *c)
238 {
239 char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
240 int r;
241
242 switch (c->c_keytype) {
243 case KT_DSA:
244 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
245 "ssh-dss-cert-v01@openssh.com" : "ssh-dss";
246 break;
247 case KT_RSA:
248 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
249 "rsa-sha2-512-cert-v01@openssh.com,"
250 "rsa-sha2-256-cert-v01@openssh.com,"
251 "ssh-rsa-cert-v01@openssh.com" :
252 "rsa-sha2-512,"
253 "rsa-sha2-256,"
254 "ssh-rsa";
255 break;
256 case KT_ED25519:
257 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
258 "ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519";
259 break;
260 case KT_XMSS:
261 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
262 "ssh-xmss-cert-v01@openssh.com" : "ssh-xmss@openssh.com";
263 break;
264 case KT_ECDSA:
265 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
266 "ecdsa-sha2-nistp256-cert-v01@openssh.com,"
267 "ecdsa-sha2-nistp384-cert-v01@openssh.com,"
268 "ecdsa-sha2-nistp521-cert-v01@openssh.com" :
269 "ecdsa-sha2-nistp256,"
270 "ecdsa-sha2-nistp384,"
271 "ecdsa-sha2-nistp521";
272 break;
273 case KT_ECDSA_SK:
274 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
275 "sk-ecdsa-sha2-nistp256-cert-v01@openssh.com" :
276 "sk-ecdsa-sha2-nistp256@openssh.com";
277 break;
278 case KT_ED25519_SK:
279 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
280 "sk-ssh-ed25519-cert-v01@openssh.com" :
281 "sk-ssh-ed25519@openssh.com";
282 break;
283 default:
284 fatal("unknown key type %d", c->c_keytype);
285 break;
286 }
287 if ((r = kex_setup(c->c_ssh, myproposal)) != 0) {
288 free(c->c_ssh);
289 fprintf(stderr, "kex_setup: %s\n", ssh_err(r));
290 exit(1);
291 }
292 #ifdef WITH_OPENSSL
293 c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_client;
294 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_client;
295 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_client;
296 c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_client;
297 c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_client;
298 c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
299 c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
300 # ifdef OPENSSL_HAS_ECC
301 c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kex_gen_client;
302 # endif
303 #endif
304 c->c_ssh->kex->kex[KEX_C25519_SHA256] = kex_gen_client;
305 c->c_ssh->kex->kex[KEX_KEM_SNTRUP761X25519_SHA512] = kex_gen_client;
306 ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper);
307 /*
308 * do the key-exchange until an error occurs or until
309 * the key_print_wrapper() callback sets c_done.
310 */
311 ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done);
312 }
313
314 static void
keyprint_one(const char * host,struct sshkey * key)315 keyprint_one(const char *host, struct sshkey *key)
316 {
317 char *hostport = NULL, *hashed = NULL;
318 const char *known_host;
319 int r = 0;
320
321 found_one = 1;
322
323 if (print_sshfp) {
324 export_dns_rr(host, key, stdout, 0, hashalg);
325 return;
326 }
327
328 hostport = put_host_port(host, ssh_port);
329 lowercase(hostport);
330 if (hash_hosts && (hashed = host_hash(hostport, NULL, 0)) == NULL)
331 fatal("host_hash failed");
332 known_host = hash_hosts ? hashed : hostport;
333 if (!get_cert)
334 r = fprintf(stdout, "%s ", known_host);
335 if (r >= 0 && sshkey_write(key, stdout) == 0)
336 (void)fputs("\n", stdout);
337 free(hashed);
338 free(hostport);
339 }
340
341 static void
keyprint(con * c,struct sshkey * key)342 keyprint(con *c, struct sshkey *key)
343 {
344 char *hosts = c->c_output_name ? c->c_output_name : c->c_name;
345 char *host, *ohosts;
346
347 if (key == NULL)
348 return;
349 if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) {
350 keyprint_one(hosts, key);
351 return;
352 }
353 ohosts = hosts = xstrdup(hosts);
354 while ((host = strsep(&hosts, ",")) != NULL)
355 keyprint_one(host, key);
356 free(ohosts);
357 }
358
359 static int
tcpconnect(char * host)360 tcpconnect(char *host)
361 {
362 struct addrinfo hints, *ai, *aitop;
363 char strport[NI_MAXSERV];
364 int gaierr, s = -1;
365
366 snprintf(strport, sizeof strport, "%d", ssh_port);
367 memset(&hints, 0, sizeof(hints));
368 hints.ai_family = IPv4or6;
369 hints.ai_socktype = SOCK_STREAM;
370 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
371 error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
372 return -1;
373 }
374 for (ai = aitop; ai; ai = ai->ai_next) {
375 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
376 if (s == -1) {
377 error("socket: %s", strerror(errno));
378 continue;
379 }
380 if (set_nonblock(s) == -1)
381 fatal_f("set_nonblock(%d)", s);
382 if (connect(s, ai->ai_addr, ai->ai_addrlen) == -1 &&
383 errno != EINPROGRESS)
384 error("connect (`%s'): %s", host, strerror(errno));
385 else
386 break;
387 close(s);
388 s = -1;
389 }
390 freeaddrinfo(aitop);
391 return s;
392 }
393
394 static int
conalloc(const char * iname,const char * oname,int keytype)395 conalloc(const char *iname, const char *oname, int keytype)
396 {
397 char *namebase, *name, *namelist;
398 int s;
399
400 namebase = namelist = xstrdup(iname);
401
402 do {
403 name = xstrsep(&namelist, ",");
404 if (!name) {
405 free(namebase);
406 return (-1);
407 }
408 } while ((s = tcpconnect(name)) < 0);
409
410 if (s >= maxfd)
411 fatal("conalloc: fdno %d too high", s);
412 if (fdcon[s].c_status)
413 fatal("conalloc: attempt to reuse fdno %d", s);
414
415 debug3_f("oname %s kt %d", oname, keytype);
416 fdcon[s].c_fd = s;
417 fdcon[s].c_status = CS_CON;
418 fdcon[s].c_namebase = namebase;
419 fdcon[s].c_name = name;
420 fdcon[s].c_namelist = namelist;
421 fdcon[s].c_output_name = xstrdup(oname);
422 fdcon[s].c_keytype = keytype;
423 monotime_ts(&fdcon[s].c_ts);
424 fdcon[s].c_ts.tv_sec += timeout;
425 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
426 read_wait[s].fd = s;
427 read_wait[s].events = POLLIN;
428 ncon++;
429 return (s);
430 }
431
432 static void
confree(int s)433 confree(int s)
434 {
435 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
436 fatal("confree: attempt to free bad fdno %d", s);
437 free(fdcon[s].c_namebase);
438 free(fdcon[s].c_output_name);
439 fdcon[s].c_status = CS_UNUSED;
440 fdcon[s].c_keytype = 0;
441 if (fdcon[s].c_ssh) {
442 ssh_packet_close(fdcon[s].c_ssh);
443 free(fdcon[s].c_ssh);
444 fdcon[s].c_ssh = NULL;
445 } else
446 close(s);
447 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
448 read_wait[s].fd = -1;
449 read_wait[s].events = 0;
450 ncon--;
451 }
452
453 static int
conrecycle(int s)454 conrecycle(int s)
455 {
456 con *c = &fdcon[s];
457 int ret;
458
459 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
460 confree(s);
461 return (ret);
462 }
463
464 static void
congreet(int s)465 congreet(int s)
466 {
467 int n = 0, remote_major = 0, remote_minor = 0;
468 char buf[256], *cp;
469 char remote_version[sizeof buf];
470 size_t bufsiz;
471 con *c = &fdcon[s];
472
473 /* send client banner */
474 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
475 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2);
476 if (n < 0 || (size_t)n >= sizeof(buf)) {
477 error("snprintf: buffer too small");
478 confree(s);
479 return;
480 }
481 if (atomicio(vwrite, s, buf, n) != (size_t)n) {
482 error("write (%s): %s", c->c_name, strerror(errno));
483 confree(s);
484 return;
485 }
486
487 /*
488 * Read the server banner as per RFC4253 section 4.2. The "SSH-"
489 * protocol identification string may be preceded by an arbitrarily
490 * large banner which we must read and ignore. Loop while reading
491 * newline-terminated lines until we have one starting with "SSH-".
492 * The ID string cannot be longer than 255 characters although the
493 * preceding banner lines may (in which case they'll be discarded
494 * in multiple iterations of the outer loop).
495 */
496 for (;;) {
497 memset(buf, '\0', sizeof(buf));
498 bufsiz = sizeof(buf);
499 cp = buf;
500 while (bufsiz-- &&
501 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
502 if (*cp == '\r')
503 *cp = '\n';
504 cp++;
505 }
506 if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
507 break;
508 }
509 if (n == 0) {
510 switch (errno) {
511 case EPIPE:
512 error("%s: Connection closed by remote host", c->c_name);
513 break;
514 case ECONNREFUSED:
515 break;
516 default:
517 error("read (%s): %s", c->c_name, strerror(errno));
518 break;
519 }
520 conrecycle(s);
521 return;
522 }
523 if (cp >= buf + sizeof(buf)) {
524 error("%s: greeting exceeds allowable length", c->c_name);
525 confree(s);
526 return;
527 }
528 if (*cp != '\n' && *cp != '\r') {
529 error("%s: bad greeting", c->c_name);
530 confree(s);
531 return;
532 }
533 *cp = '\0';
534 if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL)
535 fatal("ssh_packet_set_connection failed");
536 ssh_packet_set_timeout(c->c_ssh, timeout, 1);
537 ssh_set_app_data(c->c_ssh, c); /* back link */
538 c->c_ssh->compat = 0;
539 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
540 &remote_major, &remote_minor, remote_version) == 3)
541 compat_banner(c->c_ssh, remote_version);
542 if (!ssh2_capable(remote_major, remote_minor)) {
543 debug("%s doesn't support ssh2", c->c_name);
544 confree(s);
545 return;
546 }
547 if (!quiet) {
548 fprintf(stdout, "%c %s:%d %s\n", print_sshfp ? ';' : '#',
549 c->c_name, ssh_port, chop(buf));
550 }
551 keygrab_ssh2(c);
552 confree(s);
553 }
554
555 static void
conread(int s)556 conread(int s)
557 {
558 con *c = &fdcon[s];
559
560 if (c->c_status != CS_CON)
561 fatal("conread: invalid status %d", c->c_status);
562
563 congreet(s);
564 }
565
566 static void
conloop(void)567 conloop(void)
568 {
569 struct timespec seltime, now;
570 con *c;
571 int i;
572
573 monotime_ts(&now);
574 c = TAILQ_FIRST(&tq);
575
576 if (c && timespeccmp(&c->c_ts, &now, >))
577 timespecsub(&c->c_ts, &now, &seltime);
578 else
579 timespecclear(&seltime);
580
581 while (ppoll(read_wait, maxfd, &seltime, NULL) == -1) {
582 if (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)
583 continue;
584 error("poll error");
585 }
586
587 for (i = 0; i < maxfd; i++) {
588 if (read_wait[i].revents & (POLLHUP|POLLERR|POLLNVAL))
589 confree(i);
590 else if (read_wait[i].revents & (POLLIN|POLLHUP))
591 conread(i);
592 }
593
594 c = TAILQ_FIRST(&tq);
595 while (c && timespeccmp(&c->c_ts, &now, <)) {
596 int s = c->c_fd;
597
598 c = TAILQ_NEXT(c, c_link);
599 conrecycle(s);
600 }
601 }
602
603 static void
do_one_host(char * host)604 do_one_host(char *host)
605 {
606 char *name = strnnsep(&host, " \t\n");
607 int j;
608
609 if (name == NULL)
610 return;
611 for (j = KT_MIN; j <= KT_MAX; j *= 2) {
612 if (get_keytypes & j) {
613 while (ncon >= MAXCON)
614 conloop();
615 conalloc(name, *host ? host : name, j);
616 }
617 }
618 }
619
620 static void
do_host(char * host)621 do_host(char *host)
622 {
623 char daddr[128];
624 struct xaddr addr, end_addr;
625 u_int masklen;
626
627 if (host == NULL)
628 return;
629 if (addr_pton_cidr(host, &addr, &masklen) != 0) {
630 /* Assume argument is a hostname */
631 do_one_host(host);
632 } else {
633 /* Argument is a CIDR range */
634 debug("CIDR range %s", host);
635 end_addr = addr;
636 if (addr_host_to_all1s(&end_addr, masklen) != 0)
637 goto badaddr;
638 /*
639 * Note: we deliberately include the all-zero/ones addresses.
640 */
641 for (;;) {
642 if (addr_ntop(&addr, daddr, sizeof(daddr)) != 0) {
643 badaddr:
644 error("Invalid address %s", host);
645 return;
646 }
647 debug("CIDR expand: address %s", daddr);
648 do_one_host(daddr);
649 if (addr_cmp(&addr, &end_addr) == 0)
650 break;
651 addr_increment(&addr);
652 };
653 }
654 }
655
656 void
sshfatal(const char * file,const char * func,int line,int showfunc,LogLevel level,const char * suffix,const char * fmt,...)657 sshfatal(const char *file, const char *func, int line, int showfunc,
658 LogLevel level, const char *suffix, const char *fmt, ...)
659 {
660 va_list args;
661
662 va_start(args, fmt);
663 sshlogv(file, func, line, showfunc, level, suffix, fmt, args);
664 va_end(args);
665 cleanup_exit(255);
666 }
667
668 static void
usage(void)669 usage(void)
670 {
671 fprintf(stderr,
672 "usage: ssh-keyscan [-46cDHqv] [-f file] [-O option] [-p port] [-T timeout]\n"
673 " [-t type] [host | addrlist namelist]\n");
674 exit(1);
675 }
676
677 int
main(int argc,char ** argv)678 main(int argc, char **argv)
679 {
680 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
681 int opt, fopt_count = 0, j;
682 char *tname, *cp, *line = NULL;
683 size_t linesize = 0;
684 FILE *fp;
685
686 extern int optind;
687 extern char *optarg;
688
689 __progname = ssh_get_progname(argv[0]);
690 seed_rng();
691 TAILQ_INIT(&tq);
692
693 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
694 sanitise_stdfd();
695
696 if (argc <= 1)
697 usage();
698
699 while ((opt = getopt(argc, argv, "cDHqv46O:p:T:t:f:")) != -1) {
700 switch (opt) {
701 case 'H':
702 hash_hosts = 1;
703 break;
704 case 'c':
705 get_cert = 1;
706 break;
707 case 'D':
708 print_sshfp = 1;
709 break;
710 case 'p':
711 ssh_port = a2port(optarg);
712 if (ssh_port <= 0) {
713 fprintf(stderr, "Bad port '%s'\n", optarg);
714 exit(1);
715 }
716 break;
717 case 'T':
718 timeout = convtime(optarg);
719 if (timeout == -1 || timeout == 0) {
720 fprintf(stderr, "Bad timeout '%s'\n", optarg);
721 usage();
722 }
723 break;
724 case 'v':
725 if (!debug_flag) {
726 debug_flag = 1;
727 log_level = SYSLOG_LEVEL_DEBUG1;
728 }
729 else if (log_level < SYSLOG_LEVEL_DEBUG3)
730 log_level++;
731 else
732 fatal("Too high debugging level.");
733 break;
734 case 'q':
735 quiet = 1;
736 break;
737 case 'f':
738 if (strcmp(optarg, "-") == 0)
739 optarg = NULL;
740 argv[fopt_count++] = optarg;
741 break;
742 case 'O':
743 /* Maybe other misc options in the future too */
744 if (strncmp(optarg, "hashalg=", 8) != 0)
745 fatal("Unsupported -O option");
746 if ((hashalg = ssh_digest_alg_by_name(
747 optarg + 8)) == -1)
748 fatal("Unsupported hash algorithm");
749 break;
750 case 't':
751 get_keytypes = 0;
752 tname = strtok(optarg, ",");
753 while (tname) {
754 int type = sshkey_type_from_name(tname);
755
756 switch (type) {
757 #ifdef WITH_DSA
758 case KEY_DSA:
759 get_keytypes |= KT_DSA;
760 break;
761 #endif
762 case KEY_ECDSA:
763 get_keytypes |= KT_ECDSA;
764 break;
765 case KEY_RSA:
766 get_keytypes |= KT_RSA;
767 break;
768 case KEY_ED25519:
769 get_keytypes |= KT_ED25519;
770 break;
771 case KEY_XMSS:
772 get_keytypes |= KT_XMSS;
773 break;
774 case KEY_ED25519_SK:
775 get_keytypes |= KT_ED25519_SK;
776 break;
777 case KEY_ECDSA_SK:
778 get_keytypes |= KT_ECDSA_SK;
779 break;
780 case KEY_UNSPEC:
781 default:
782 fatal("Unknown key type \"%s\"", tname);
783 }
784 tname = strtok(NULL, ",");
785 }
786 break;
787 case '4':
788 IPv4or6 = AF_INET;
789 break;
790 case '6':
791 IPv4or6 = AF_INET6;
792 break;
793 default:
794 usage();
795 }
796 }
797 if (optind == argc && !fopt_count)
798 usage();
799
800 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
801
802 maxfd = fdlim_get(1);
803 if (maxfd < 0)
804 fatal("%s: fdlim_get: bad value", __progname);
805 if (maxfd > MAXMAXFD)
806 maxfd = MAXMAXFD;
807 if (MAXCON <= 0)
808 fatal("%s: not enough file descriptors", __progname);
809 if (maxfd > fdlim_get(0))
810 fdlim_set(maxfd);
811 fdcon = xcalloc(maxfd, sizeof(con));
812 read_wait = xcalloc(maxfd, sizeof(struct pollfd));
813 for (j = 0; j < maxfd; j++)
814 read_wait[j].fd = -1;
815
816 for (j = 0; j < fopt_count; j++) {
817 if (argv[j] == NULL)
818 fp = stdin;
819 else if ((fp = fopen(argv[j], "r")) == NULL)
820 fatal("%s: %s: %s", __progname,
821 fp == stdin ? "<stdin>" : argv[j], strerror(errno));
822
823 while (getline(&line, &linesize, fp) != -1) {
824 /* Chomp off trailing whitespace and comments */
825 if ((cp = strchr(line, '#')) == NULL)
826 cp = line + strlen(line) - 1;
827 while (cp >= line) {
828 if (*cp == ' ' || *cp == '\t' ||
829 *cp == '\n' || *cp == '#')
830 *cp-- = '\0';
831 else
832 break;
833 }
834
835 /* Skip empty lines */
836 if (*line == '\0')
837 continue;
838
839 do_host(line);
840 }
841
842 if (ferror(fp))
843 fatal("%s: %s: %s", __progname,
844 fp == stdin ? "<stdin>" : argv[j], strerror(errno));
845
846 if (fp != stdin)
847 fclose(fp);
848 }
849 free(line);
850
851 while (optind < argc)
852 do_host(argv[optind++]);
853
854 while (ncon > 0)
855 conloop();
856
857 return found_one ? 0 : 1;
858 }
859