1 /* $OpenBSD: ssh-keyscan.c,v 1.161 2024/09/09 02:39:57 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 c->c_ssh->kex->kex[KEX_KEM_MLKEM768X25519_SHA256] = kex_gen_client;
307 ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper);
308 /*
309 * do the key-exchange until an error occurs or until
310 * the key_print_wrapper() callback sets c_done.
311 */
312 ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done);
313 }
314
315 static void
keyprint_one(const char * host,struct sshkey * key)316 keyprint_one(const char *host, struct sshkey *key)
317 {
318 char *hostport = NULL, *hashed = NULL;
319 const char *known_host;
320 int r = 0;
321
322 found_one = 1;
323
324 if (print_sshfp) {
325 export_dns_rr(host, key, stdout, 0, hashalg);
326 return;
327 }
328
329 hostport = put_host_port(host, ssh_port);
330 lowercase(hostport);
331 if (hash_hosts && (hashed = host_hash(hostport, NULL, 0)) == NULL)
332 fatal("host_hash failed");
333 known_host = hash_hosts ? hashed : hostport;
334 if (!get_cert)
335 r = fprintf(stdout, "%s ", known_host);
336 if (r >= 0 && sshkey_write(key, stdout) == 0)
337 (void)fputs("\n", stdout);
338 free(hashed);
339 free(hostport);
340 }
341
342 static void
keyprint(con * c,struct sshkey * key)343 keyprint(con *c, struct sshkey *key)
344 {
345 char *hosts = c->c_output_name ? c->c_output_name : c->c_name;
346 char *host, *ohosts;
347
348 if (key == NULL)
349 return;
350 if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) {
351 keyprint_one(hosts, key);
352 return;
353 }
354 ohosts = hosts = xstrdup(hosts);
355 while ((host = strsep(&hosts, ",")) != NULL)
356 keyprint_one(host, key);
357 free(ohosts);
358 }
359
360 static int
tcpconnect(char * host)361 tcpconnect(char *host)
362 {
363 struct addrinfo hints, *ai, *aitop;
364 char strport[NI_MAXSERV];
365 int gaierr, s = -1;
366
367 snprintf(strport, sizeof strport, "%d", ssh_port);
368 memset(&hints, 0, sizeof(hints));
369 hints.ai_family = IPv4or6;
370 hints.ai_socktype = SOCK_STREAM;
371 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
372 error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
373 return -1;
374 }
375 for (ai = aitop; ai; ai = ai->ai_next) {
376 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
377 if (s == -1) {
378 error("socket: %s", strerror(errno));
379 continue;
380 }
381 if (set_nonblock(s) == -1)
382 fatal_f("set_nonblock(%d)", s);
383 if (connect(s, ai->ai_addr, ai->ai_addrlen) == -1 &&
384 errno != EINPROGRESS)
385 error("connect (`%s'): %s", host, strerror(errno));
386 else
387 break;
388 close(s);
389 s = -1;
390 }
391 freeaddrinfo(aitop);
392 return s;
393 }
394
395 static int
conalloc(const char * iname,const char * oname,int keytype)396 conalloc(const char *iname, const char *oname, int keytype)
397 {
398 char *namebase, *name, *namelist;
399 int s;
400
401 namebase = namelist = xstrdup(iname);
402
403 do {
404 name = xstrsep(&namelist, ",");
405 if (!name) {
406 free(namebase);
407 return (-1);
408 }
409 } while ((s = tcpconnect(name)) < 0);
410
411 if (s >= maxfd)
412 fatal("conalloc: fdno %d too high", s);
413 if (fdcon[s].c_status)
414 fatal("conalloc: attempt to reuse fdno %d", s);
415
416 debug3_f("oname %s kt %d", oname, keytype);
417 fdcon[s].c_fd = s;
418 fdcon[s].c_status = CS_CON;
419 fdcon[s].c_namebase = namebase;
420 fdcon[s].c_name = name;
421 fdcon[s].c_namelist = namelist;
422 fdcon[s].c_output_name = xstrdup(oname);
423 fdcon[s].c_keytype = keytype;
424 monotime_ts(&fdcon[s].c_ts);
425 fdcon[s].c_ts.tv_sec += timeout;
426 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
427 read_wait[s].fd = s;
428 read_wait[s].events = POLLIN;
429 ncon++;
430 return (s);
431 }
432
433 static void
confree(int s)434 confree(int s)
435 {
436 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
437 fatal("confree: attempt to free bad fdno %d", s);
438 free(fdcon[s].c_namebase);
439 free(fdcon[s].c_output_name);
440 fdcon[s].c_status = CS_UNUSED;
441 fdcon[s].c_keytype = 0;
442 if (fdcon[s].c_ssh) {
443 ssh_packet_close(fdcon[s].c_ssh);
444 free(fdcon[s].c_ssh);
445 fdcon[s].c_ssh = NULL;
446 } else
447 close(s);
448 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
449 read_wait[s].fd = -1;
450 read_wait[s].events = 0;
451 ncon--;
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 /*
489 * Read the server banner as per RFC4253 section 4.2. The "SSH-"
490 * protocol identification string may be preceded by an arbitrarily
491 * large banner which we must read and ignore. Loop while reading
492 * newline-terminated lines until we have one starting with "SSH-".
493 * The ID string cannot be longer than 255 characters although the
494 * preceding banner lines may (in which case they'll be discarded
495 * in multiple iterations of the outer loop).
496 */
497 for (;;) {
498 memset(buf, '\0', sizeof(buf));
499 bufsiz = sizeof(buf);
500 cp = buf;
501 while (bufsiz-- &&
502 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
503 if (*cp == '\r')
504 *cp = '\n';
505 cp++;
506 }
507 if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
508 break;
509 }
510 if (n == 0) {
511 switch (errno) {
512 case EPIPE:
513 error("%s: Connection closed by remote host", c->c_name);
514 break;
515 case ECONNREFUSED:
516 break;
517 default:
518 error("read (%s): %s", c->c_name, strerror(errno));
519 break;
520 }
521 conrecycle(s);
522 return;
523 }
524 if (cp >= buf + sizeof(buf)) {
525 error("%s: greeting exceeds allowable length", c->c_name);
526 confree(s);
527 return;
528 }
529 if (*cp != '\n' && *cp != '\r') {
530 error("%s: bad greeting", c->c_name);
531 confree(s);
532 return;
533 }
534 *cp = '\0';
535 if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL)
536 fatal("ssh_packet_set_connection failed");
537 ssh_packet_set_timeout(c->c_ssh, timeout, 1);
538 ssh_set_app_data(c->c_ssh, c); /* back link */
539 c->c_ssh->compat = 0;
540 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
541 &remote_major, &remote_minor, remote_version) == 3)
542 compat_banner(c->c_ssh, remote_version);
543 if (!ssh2_capable(remote_major, remote_minor)) {
544 debug("%s doesn't support ssh2", c->c_name);
545 confree(s);
546 return;
547 }
548 if (!quiet) {
549 fprintf(stdout, "%c %s:%d %s\n", print_sshfp ? ';' : '#',
550 c->c_name, ssh_port, chop(buf));
551 }
552 keygrab_ssh2(c);
553 confree(s);
554 }
555
556 static void
conread(int s)557 conread(int s)
558 {
559 con *c = &fdcon[s];
560
561 if (c->c_status != CS_CON)
562 fatal("conread: invalid status %d", c->c_status);
563
564 congreet(s);
565 }
566
567 static void
conloop(void)568 conloop(void)
569 {
570 struct timespec seltime, now;
571 con *c;
572 int i;
573
574 monotime_ts(&now);
575 c = TAILQ_FIRST(&tq);
576
577 if (c && timespeccmp(&c->c_ts, &now, >))
578 timespecsub(&c->c_ts, &now, &seltime);
579 else
580 timespecclear(&seltime);
581
582 while (ppoll(read_wait, maxfd, &seltime, NULL) == -1) {
583 if (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)
584 continue;
585 error("poll error");
586 }
587
588 for (i = 0; i < maxfd; i++) {
589 if (read_wait[i].revents & (POLLHUP|POLLERR|POLLNVAL))
590 confree(i);
591 else if (read_wait[i].revents & (POLLIN|POLLHUP))
592 conread(i);
593 }
594
595 c = TAILQ_FIRST(&tq);
596 while (c && timespeccmp(&c->c_ts, &now, <)) {
597 int s = c->c_fd;
598
599 c = TAILQ_NEXT(c, c_link);
600 conrecycle(s);
601 }
602 }
603
604 static void
do_one_host(char * host)605 do_one_host(char *host)
606 {
607 char *name = strnnsep(&host, " \t\n");
608 int j;
609
610 if (name == NULL)
611 return;
612 for (j = KT_MIN; j <= KT_MAX; j *= 2) {
613 if (get_keytypes & j) {
614 while (ncon >= MAXCON)
615 conloop();
616 conalloc(name, *host ? host : name, j);
617 }
618 }
619 }
620
621 static void
do_host(char * host)622 do_host(char *host)
623 {
624 char daddr[128];
625 struct xaddr addr, end_addr;
626 u_int masklen;
627
628 if (host == NULL)
629 return;
630 if (addr_pton_cidr(host, &addr, &masklen) != 0) {
631 /* Assume argument is a hostname */
632 do_one_host(host);
633 } else {
634 /* Argument is a CIDR range */
635 debug("CIDR range %s", host);
636 end_addr = addr;
637 if (addr_host_to_all1s(&end_addr, masklen) != 0)
638 goto badaddr;
639 /*
640 * Note: we deliberately include the all-zero/ones addresses.
641 */
642 for (;;) {
643 if (addr_ntop(&addr, daddr, sizeof(daddr)) != 0) {
644 badaddr:
645 error("Invalid address %s", host);
646 return;
647 }
648 debug("CIDR expand: address %s", daddr);
649 do_one_host(daddr);
650 if (addr_cmp(&addr, &end_addr) == 0)
651 break;
652 addr_increment(&addr);
653 };
654 }
655 }
656
657 void
sshfatal(const char * file,const char * func,int line,int showfunc,LogLevel level,const char * suffix,const char * fmt,...)658 sshfatal(const char *file, const char *func, int line, int showfunc,
659 LogLevel level, const char *suffix, const char *fmt, ...)
660 {
661 va_list args;
662
663 va_start(args, fmt);
664 sshlogv(file, func, line, showfunc, level, suffix, fmt, args);
665 va_end(args);
666 cleanup_exit(255);
667 }
668
669 static void
usage(void)670 usage(void)
671 {
672 fprintf(stderr,
673 "usage: ssh-keyscan [-46cDHqv] [-f file] [-O option] [-p port] [-T timeout]\n"
674 " [-t type] [host | addrlist namelist]\n");
675 exit(1);
676 }
677
678 int
main(int argc,char ** argv)679 main(int argc, char **argv)
680 {
681 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
682 int opt, fopt_count = 0, j;
683 char *tname, *cp, *line = NULL;
684 size_t linesize = 0;
685 FILE *fp;
686
687 extern int optind;
688 extern char *optarg;
689
690 __progname = ssh_get_progname(argv[0]);
691 seed_rng();
692 TAILQ_INIT(&tq);
693
694 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
695 sanitise_stdfd();
696
697 if (argc <= 1)
698 usage();
699
700 while ((opt = getopt(argc, argv, "cDHqv46O:p:T:t:f:")) != -1) {
701 switch (opt) {
702 case 'H':
703 hash_hosts = 1;
704 break;
705 case 'c':
706 get_cert = 1;
707 break;
708 case 'D':
709 print_sshfp = 1;
710 break;
711 case 'p':
712 ssh_port = a2port(optarg);
713 if (ssh_port <= 0) {
714 fprintf(stderr, "Bad port '%s'\n", optarg);
715 exit(1);
716 }
717 break;
718 case 'T':
719 timeout = convtime(optarg);
720 if (timeout == -1 || timeout == 0) {
721 fprintf(stderr, "Bad timeout '%s'\n", optarg);
722 usage();
723 }
724 break;
725 case 'v':
726 if (!debug_flag) {
727 debug_flag = 1;
728 log_level = SYSLOG_LEVEL_DEBUG1;
729 }
730 else if (log_level < SYSLOG_LEVEL_DEBUG3)
731 log_level++;
732 else
733 fatal("Too high debugging level.");
734 break;
735 case 'q':
736 quiet = 1;
737 break;
738 case 'f':
739 if (strcmp(optarg, "-") == 0)
740 optarg = NULL;
741 argv[fopt_count++] = optarg;
742 break;
743 case 'O':
744 /* Maybe other misc options in the future too */
745 if (strncmp(optarg, "hashalg=", 8) != 0)
746 fatal("Unsupported -O option");
747 if ((hashalg = ssh_digest_alg_by_name(
748 optarg + 8)) == -1)
749 fatal("Unsupported hash algorithm");
750 break;
751 case 't':
752 get_keytypes = 0;
753 tname = strtok(optarg, ",");
754 while (tname) {
755 int type = sshkey_type_from_shortname(tname);
756
757 switch (type) {
758 #ifdef WITH_DSA
759 case KEY_DSA:
760 get_keytypes |= KT_DSA;
761 break;
762 #endif
763 case KEY_ECDSA:
764 get_keytypes |= KT_ECDSA;
765 break;
766 case KEY_RSA:
767 get_keytypes |= KT_RSA;
768 break;
769 case KEY_ED25519:
770 get_keytypes |= KT_ED25519;
771 break;
772 case KEY_XMSS:
773 get_keytypes |= KT_XMSS;
774 break;
775 case KEY_ED25519_SK:
776 get_keytypes |= KT_ED25519_SK;
777 break;
778 case KEY_ECDSA_SK:
779 get_keytypes |= KT_ECDSA_SK;
780 break;
781 case KEY_UNSPEC:
782 default:
783 fatal("Unknown key type \"%s\"", tname);
784 }
785 tname = strtok(NULL, ",");
786 }
787 break;
788 case '4':
789 IPv4or6 = AF_INET;
790 break;
791 case '6':
792 IPv4or6 = AF_INET6;
793 break;
794 default:
795 usage();
796 }
797 }
798 if (optind == argc && !fopt_count)
799 usage();
800
801 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
802
803 maxfd = fdlim_get(1);
804 if (maxfd < 0)
805 fatal("%s: fdlim_get: bad value", __progname);
806 if (maxfd > MAXMAXFD)
807 maxfd = MAXMAXFD;
808 if (MAXCON <= 0)
809 fatal("%s: not enough file descriptors", __progname);
810 if (maxfd > fdlim_get(0))
811 fdlim_set(maxfd);
812 fdcon = xcalloc(maxfd, sizeof(con));
813 read_wait = xcalloc(maxfd, sizeof(struct pollfd));
814 for (j = 0; j < maxfd; j++)
815 read_wait[j].fd = -1;
816
817 for (j = 0; j < fopt_count; j++) {
818 if (argv[j] == NULL)
819 fp = stdin;
820 else if ((fp = fopen(argv[j], "r")) == NULL)
821 fatal("%s: %s: %s", __progname,
822 fp == stdin ? "<stdin>" : argv[j], strerror(errno));
823
824 while (getline(&line, &linesize, fp) != -1) {
825 /* Chomp off trailing whitespace and comments */
826 if ((cp = strchr(line, '#')) == NULL)
827 cp = line + strlen(line) - 1;
828 while (cp >= line) {
829 if (*cp == ' ' || *cp == '\t' ||
830 *cp == '\n' || *cp == '#')
831 *cp-- = '\0';
832 else
833 break;
834 }
835
836 /* Skip empty lines */
837 if (*line == '\0')
838 continue;
839
840 do_host(line);
841 }
842
843 if (ferror(fp))
844 fatal("%s: %s: %s", __progname,
845 fp == stdin ? "<stdin>" : argv[j], strerror(errno));
846
847 if (fp != stdin)
848 fclose(fp);
849 }
850 free(line);
851
852 while (optind < argc)
853 do_host(argv[optind++]);
854
855 while (ncon > 0)
856 conloop();
857
858 return found_one ? 0 : 1;
859 }
860