Annotation of src/usr.bin/ssh/ssh-keyscan.c, Revision 1.97
1.97 ! djm 1: /* $OpenBSD: ssh-keyscan.c,v 1.96 2015/01/20 23:14:00 deraadt Exp $ */
1.1 markus 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
1.23 pvalchev 7: * OpenBSD project by leaving this copyright notice intact.
1.1 markus 8: */
9:
1.65 stevesk 10: #include <sys/types.h>
11: #include <sys/socket.h>
1.1 markus 12: #include <sys/queue.h>
1.74 djm 13: #include <sys/time.h>
1.59 stevesk 14: #include <sys/resource.h>
1.58 stevesk 15:
1.69 stevesk 16: #include <openssl/bn.h>
17:
1.1 markus 18: #include <errno.h>
1.67 stevesk 19: #include <netdb.h>
1.66 stevesk 20: #include <stdarg.h>
1.72 stevesk 21: #include <stdio.h>
1.71 stevesk 22: #include <stdlib.h>
1.73 deraadt 23: #include <signal.h>
1.69 stevesk 24: #include <string.h>
1.68 stevesk 25: #include <unistd.h>
1.1 markus 26:
27: #include "xmalloc.h"
28: #include "ssh.h"
1.10 markus 29: #include "ssh1.h"
1.95 markus 30: #include "sshbuf.h"
31: #include "sshkey.h"
1.73 deraadt 32: #include "cipher.h"
1.26 markus 33: #include "kex.h"
34: #include "compat.h"
35: #include "myproposal.h"
36: #include "packet.h"
37: #include "dispatch.h"
1.11 markus 38: #include "log.h"
1.18 deraadt 39: #include "atomicio.h"
1.26 markus 40: #include "misc.h"
1.51 djm 41: #include "hostfile.h"
1.95 markus 42: #include "ssherr.h"
43: #include "ssh_api.h"
1.1 markus 44:
1.26 markus 45: /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
46: Default value is AF_UNSPEC means both IPv4 and IPv6. */
47: int IPv4or6 = AF_UNSPEC;
48:
49: int ssh_port = SSH_DEFAULT_PORT;
1.1 markus 50:
1.83 djm 51: #define KT_RSA1 1
52: #define KT_DSA 2
53: #define KT_RSA 4
54: #define KT_ECDSA 8
1.89 markus 55: #define KT_ED25519 16
1.26 markus 56:
1.90 djm 57: int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519;
1.1 markus 58:
1.51 djm 59: int hash_hosts = 0; /* Hash hostname on output */
60:
1.1 markus 61: #define MAXMAXFD 256
62:
63: /* The number of seconds after which to give up on a TCP connection */
64: int timeout = 5;
65:
66: int maxfd;
1.18 deraadt 67: #define MAXCON (maxfd - 10)
1.1 markus 68:
1.3 markus 69: extern char *__progname;
1.19 millert 70: fd_set *read_wait;
1.63 djm 71: size_t read_wait_nfdset;
1.1 markus 72: int ncon;
73:
74: /*
75: * Keep a connection structure for each file descriptor. The state
76: * associated with file descriptor n is held in fdcon[n].
77: */
78: typedef struct Connection {
1.6 markus 79: u_char c_status; /* State of connection on this file desc. */
1.1 markus 80: #define CS_UNUSED 0 /* File descriptor unused */
81: #define CS_CON 1 /* Waiting to connect/read greeting */
82: #define CS_SIZE 2 /* Waiting to read initial packet size */
83: #define CS_KEYS 3 /* Waiting to read public key packet */
84: int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
85: int c_plen; /* Packet length field for ssh packet */
86: int c_len; /* Total bytes which must be read. */
87: int c_off; /* Length of data read so far. */
1.26 markus 88: int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
1.95 markus 89: int c_done; /* SSH2 done */
1.1 markus 90: char *c_namebase; /* Address to free for c_name and c_namelist */
91: char *c_name; /* Hostname of connection for errors */
92: char *c_namelist; /* Pointer to other possible addresses */
93: char *c_output_name; /* Hostname of connection for output */
94: char *c_data; /* Data read from this fd */
1.95 markus 95: struct ssh *c_ssh; /* SSH-connection */
1.1 markus 96: struct timeval c_tv; /* Time at which connection gets aborted */
97: TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
98: } con;
99:
100: TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
101: con *fdcon;
102:
1.95 markus 103: static void keyprint(con *c, struct sshkey *key);
104:
1.24 itojun 105: static int
1.1 markus 106: fdlim_get(int hard)
107: {
108: struct rlimit rlfd;
1.17 deraadt 109:
1.1 markus 110: if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
111: return (-1);
112: if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
1.46 djm 113: return sysconf(_SC_OPEN_MAX);
1.1 markus 114: else
115: return hard ? rlfd.rlim_max : rlfd.rlim_cur;
116: }
117:
1.24 itojun 118: static int
1.1 markus 119: fdlim_set(int lim)
120: {
121: struct rlimit rlfd;
1.39 deraadt 122:
1.1 markus 123: if (lim <= 0)
124: return (-1);
125: if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
126: return (-1);
127: rlfd.rlim_cur = lim;
128: if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
129: return (-1);
130: return (0);
131: }
132:
133: /*
134: * This is an strsep function that returns a null field for adjacent
135: * separators. This is the same as the 4.4BSD strsep, but different from the
136: * one in the GNU libc.
137: */
1.24 itojun 138: static char *
1.1 markus 139: xstrsep(char **str, const char *delim)
140: {
141: char *s, *e;
142:
143: if (!**str)
144: return (NULL);
145:
146: s = *str;
147: e = s + strcspn(s, delim);
148:
149: if (*e != '\0')
150: *e++ = '\0';
151: *str = e;
152:
153: return (s);
154: }
155:
156: /*
157: * Get the next non-null token (like GNU strsep). Strsep() will return a
158: * null token for two adjacent separators, so we may have to loop.
159: */
1.24 itojun 160: static char *
1.1 markus 161: strnnsep(char **stringp, char *delim)
162: {
163: char *tok;
164:
165: do {
166: tok = xstrsep(stringp, delim);
167: } while (tok && *tok == '\0');
168: return (tok);
169: }
170:
1.92 markus 171: #ifdef WITH_SSH1
1.95 markus 172: static struct sshkey *
1.26 markus 173: keygrab_ssh1(con *c)
1.1 markus 174: {
1.95 markus 175: static struct sshkey *rsa;
176: static struct sshbuf *msg;
177: int r;
178: u_char type;
1.1 markus 179:
180: if (rsa == NULL) {
1.95 markus 181: if ((rsa = sshkey_new(KEY_RSA1)) == NULL) {
182: error("%s: sshkey_new failed", __func__);
183: return NULL;
184: }
185: if ((msg = sshbuf_new()) == NULL)
186: fatal("%s: sshbuf_new failed", __func__);
1.1 markus 187: }
1.95 markus 188: if ((r = sshbuf_put(msg, c->c_data, c->c_plen)) != 0 ||
189: (r = sshbuf_consume(msg, 8 - (c->c_plen & 7))) != 0 || /* padding */
190: (r = sshbuf_get_u8(msg, &type)) != 0)
191: goto buf_err;
192: if (type != (int) SSH_SMSG_PUBLIC_KEY) {
1.26 markus 193: error("%s: invalid packet type", c->c_name);
1.95 markus 194: sshbuf_reset(msg);
195: return NULL;
196: }
197: if ((r = sshbuf_consume(msg, 8)) != 0 || /* cookie */
198: /* server key */
199: (r = sshbuf_get_u32(msg, NULL)) != 0 ||
200: (r = sshbuf_get_bignum1(msg, NULL)) != 0 ||
201: (r = sshbuf_get_bignum1(msg, NULL)) != 0 ||
202: /* host key */
203: (r = sshbuf_get_u32(msg, NULL)) != 0 ||
204: (r = sshbuf_get_bignum1(msg, rsa->rsa->e)) != 0 ||
205: (r = sshbuf_get_bignum1(msg, rsa->rsa->n)) != 0) {
206: buf_err:
207: error("%s: buffer error: %s", __func__, ssh_err(r));
208: sshbuf_reset(msg);
1.26 markus 209: return NULL;
1.1 markus 210: }
211:
1.95 markus 212: sshbuf_reset(msg);
1.1 markus 213:
1.26 markus 214: return (rsa);
215: }
1.92 markus 216: #endif
1.26 markus 217:
218: static int
1.95 markus 219: key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh)
1.26 markus 220: {
1.95 markus 221: con *c;
222:
223: if ((c = ssh_get_app_data(ssh)) != NULL)
224: keyprint(c, hostkey);
225: /* always abort key exchange */
226: return -1;
1.26 markus 227: }
228:
229: static int
230: ssh2_capable(int remote_major, int remote_minor)
231: {
232: switch (remote_major) {
233: case 1:
234: if (remote_minor == 99)
235: return 1;
236: break;
237: case 2:
238: return 1;
239: default:
240: break;
241: }
242: return 0;
243: }
244:
1.95 markus 245: static void
1.26 markus 246: keygrab_ssh2(con *c)
247: {
1.91 markus 248: char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
1.95 markus 249: int r;
1.26 markus 250:
251: enable_compat20();
1.89 markus 252: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
253: c->c_keytype == KT_DSA ? "ssh-dss" :
254: (c->c_keytype == KT_RSA ? "ssh-rsa" :
255: (c->c_keytype == KT_ED25519 ? "ssh-ed25519" :
256: "ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521"));
1.95 markus 257: if ((r = kex_setup(c->c_ssh, myproposal)) != 0) {
258: free(c->c_ssh);
259: fprintf(stderr, "kex_setup: %s\n", ssh_err(r));
260: exit(1);
261: }
1.92 markus 262: #ifdef WITH_OPENSSL
1.95 markus 263: c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
264: c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
265: c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
266: c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
267: c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kexecdh_client;
1.92 markus 268: #endif
1.95 markus 269: c->c_ssh->kex->kex[KEX_C25519_SHA256] = kexc25519_client;
270: ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper);
271: /*
272: * do the key-exchange until an error occurs or until
273: * the key_print_wrapper() callback sets c_done.
274: */
275: ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done, c->c_ssh);
1.26 markus 276: }
277:
278: static void
1.95 markus 279: keyprint(con *c, struct sshkey *key)
1.26 markus 280: {
1.51 djm 281: char *host = c->c_output_name ? c->c_output_name : c->c_name;
282:
1.26 markus 283: if (!key)
284: return;
1.51 djm 285: if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL)
286: fatal("host_hash failed");
1.26 markus 287:
1.51 djm 288: fprintf(stdout, "%s ", host);
1.95 markus 289: sshkey_write(key, stdout);
1.1 markus 290: fputs("\n", stdout);
291: }
292:
1.24 itojun 293: static int
1.1 markus 294: tcpconnect(char *host)
295: {
296: struct addrinfo hints, *ai, *aitop;
297: char strport[NI_MAXSERV];
298: int gaierr, s = -1;
299:
1.26 markus 300: snprintf(strport, sizeof strport, "%d", ssh_port);
1.1 markus 301: memset(&hints, 0, sizeof(hints));
1.26 markus 302: hints.ai_family = IPv4or6;
1.1 markus 303: hints.ai_socktype = SOCK_STREAM;
1.97 ! djm 304: if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
! 305: error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
! 306: return -1;
! 307: }
1.1 markus 308: for (ai = aitop; ai; ai = ai->ai_next) {
1.81 dtucker 309: s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.1 markus 310: if (s < 0) {
311: error("socket: %s", strerror(errno));
312: continue;
313: }
1.49 djm 314: if (set_nonblock(s) == -1)
315: fatal("%s: set_nonblock(%d)", __func__, s);
1.1 markus 316: if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
317: errno != EINPROGRESS)
318: error("connect (`%s'): %s", host, strerror(errno));
319: else
320: break;
321: close(s);
322: s = -1;
323: }
324: freeaddrinfo(aitop);
325: return s;
326: }
327:
1.24 itojun 328: static int
1.26 markus 329: conalloc(char *iname, char *oname, int keytype)
1.1 markus 330: {
1.39 deraadt 331: char *namebase, *name, *namelist;
1.1 markus 332: int s;
333:
334: namebase = namelist = xstrdup(iname);
335:
336: do {
337: name = xstrsep(&namelist, ",");
338: if (!name) {
1.87 djm 339: free(namebase);
1.1 markus 340: return (-1);
341: }
342: } while ((s = tcpconnect(name)) < 0);
343:
344: if (s >= maxfd)
1.4 markus 345: fatal("conalloc: fdno %d too high", s);
1.1 markus 346: if (fdcon[s].c_status)
1.4 markus 347: fatal("conalloc: attempt to reuse fdno %d", s);
1.1 markus 348:
349: fdcon[s].c_fd = s;
350: fdcon[s].c_status = CS_CON;
351: fdcon[s].c_namebase = namebase;
352: fdcon[s].c_name = name;
353: fdcon[s].c_namelist = namelist;
354: fdcon[s].c_output_name = xstrdup(oname);
355: fdcon[s].c_data = (char *) &fdcon[s].c_plen;
356: fdcon[s].c_len = 4;
357: fdcon[s].c_off = 0;
1.26 markus 358: fdcon[s].c_keytype = keytype;
1.1 markus 359: gettimeofday(&fdcon[s].c_tv, NULL);
360: fdcon[s].c_tv.tv_sec += timeout;
361: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
1.19 millert 362: FD_SET(s, read_wait);
1.1 markus 363: ncon++;
364: return (s);
365: }
366:
1.24 itojun 367: static void
1.1 markus 368: confree(int s)
369: {
370: if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
1.4 markus 371: fatal("confree: attempt to free bad fdno %d", s);
1.18 deraadt 372: close(s);
1.87 djm 373: free(fdcon[s].c_namebase);
374: free(fdcon[s].c_output_name);
1.1 markus 375: if (fdcon[s].c_status == CS_KEYS)
1.87 djm 376: free(fdcon[s].c_data);
1.1 markus 377: fdcon[s].c_status = CS_UNUSED;
1.26 markus 378: fdcon[s].c_keytype = 0;
1.95 markus 379: if (fdcon[s].c_ssh) {
380: ssh_packet_close(fdcon[s].c_ssh);
381: free(fdcon[s].c_ssh);
382: fdcon[s].c_ssh = NULL;
383: }
1.1 markus 384: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
1.19 millert 385: FD_CLR(s, read_wait);
1.1 markus 386: ncon--;
387: }
388:
1.24 itojun 389: static void
1.1 markus 390: contouch(int s)
391: {
392: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
393: gettimeofday(&fdcon[s].c_tv, NULL);
394: fdcon[s].c_tv.tv_sec += timeout;
395: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
396: }
397:
1.24 itojun 398: static int
1.1 markus 399: conrecycle(int s)
400: {
1.39 deraadt 401: con *c = &fdcon[s];
1.1 markus 402: int ret;
403:
1.26 markus 404: ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
1.1 markus 405: confree(s);
406: return (ret);
407: }
408:
1.24 itojun 409: static void
1.1 markus 410: congreet(int s)
411: {
1.55 djm 412: int n = 0, remote_major = 0, remote_minor = 0;
1.26 markus 413: char buf[256], *cp;
1.33 markus 414: char remote_version[sizeof buf];
1.55 djm 415: size_t bufsiz;
1.1 markus 416: con *c = &fdcon[s];
417:
1.57 djm 418: for (;;) {
419: memset(buf, '\0', sizeof(buf));
420: bufsiz = sizeof(buf);
421: cp = buf;
422: while (bufsiz-- &&
423: (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
424: if (*cp == '\r')
425: *cp = '\n';
426: cp++;
427: }
428: if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
429: break;
1.27 markus 430: }
1.54 avsm 431: if (n == 0) {
432: switch (errno) {
433: case EPIPE:
434: error("%s: Connection closed by remote host", c->c_name);
435: break;
436: case ECONNREFUSED:
437: break;
438: default:
1.1 markus 439: error("read (%s): %s", c->c_name, strerror(errno));
1.54 avsm 440: break;
441: }
1.1 markus 442: conrecycle(s);
443: return;
444: }
1.21 millert 445: if (*cp != '\n' && *cp != '\r') {
1.1 markus 446: error("%s: bad greeting", c->c_name);
447: confree(s);
448: return;
449: }
1.21 millert 450: *cp = '\0';
1.95 markus 451: c->c_ssh = ssh_packet_set_connection(NULL, s, s);
452: ssh_set_app_data(c->c_ssh, c); /* back link */
1.33 markus 453: if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
454: &remote_major, &remote_minor, remote_version) == 3)
1.95 markus 455: c->c_ssh->compat = compat_datafellows(remote_version);
1.33 markus 456: else
1.95 markus 457: c->c_ssh->compat = 0;
1.26 markus 458: if (c->c_keytype != KT_RSA1) {
459: if (!ssh2_capable(remote_major, remote_minor)) {
460: debug("%s doesn't support ssh2", c->c_name);
461: confree(s);
462: return;
463: }
1.33 markus 464: } else if (remote_major != 1) {
465: debug("%s doesn't support ssh1", c->c_name);
466: confree(s);
467: return;
1.26 markus 468: }
1.27 markus 469: fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
1.26 markus 470: n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
471: c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
472: c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
1.55 djm 473: if (n < 0 || (size_t)n >= sizeof(buf)) {
1.53 moritz 474: error("snprintf: buffer too small");
475: confree(s);
476: return;
477: }
1.55 djm 478: if (atomicio(vwrite, s, buf, n) != (size_t)n) {
1.1 markus 479: error("write (%s): %s", c->c_name, strerror(errno));
480: confree(s);
481: return;
482: }
1.26 markus 483: if (c->c_keytype != KT_RSA1) {
1.95 markus 484: keygrab_ssh2(c);
1.26 markus 485: confree(s);
486: return;
487: }
1.1 markus 488: c->c_status = CS_SIZE;
489: contouch(s);
490: }
491:
1.24 itojun 492: static void
1.1 markus 493: conread(int s)
494: {
1.39 deraadt 495: con *c = &fdcon[s];
1.54 avsm 496: size_t n;
1.1 markus 497:
498: if (c->c_status == CS_CON) {
499: congreet(s);
500: return;
501: }
1.50 avsm 502: n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
1.54 avsm 503: if (n == 0) {
1.1 markus 504: error("read (%s): %s", c->c_name, strerror(errno));
505: confree(s);
506: return;
507: }
508: c->c_off += n;
509:
510: if (c->c_off == c->c_len)
511: switch (c->c_status) {
512: case CS_SIZE:
513: c->c_plen = htonl(c->c_plen);
514: c->c_len = c->c_plen + 8 - (c->c_plen & 7);
515: c->c_off = 0;
516: c->c_data = xmalloc(c->c_len);
517: c->c_status = CS_KEYS;
518: break;
1.92 markus 519: #ifdef WITH_SSH1
1.1 markus 520: case CS_KEYS:
1.26 markus 521: keyprint(c, keygrab_ssh1(c));
1.1 markus 522: confree(s);
523: return;
1.92 markus 524: #endif
1.1 markus 525: default:
1.4 markus 526: fatal("conread: invalid status %d", c->c_status);
1.1 markus 527: break;
528: }
529:
530: contouch(s);
531: }
532:
1.24 itojun 533: static void
1.1 markus 534: conloop(void)
535: {
1.39 deraadt 536: struct timeval seltime, now;
1.19 millert 537: fd_set *r, *e;
1.39 deraadt 538: con *c;
1.1 markus 539: int i;
540:
541: gettimeofday(&now, NULL);
1.36 itojun 542: c = TAILQ_FIRST(&tq);
1.1 markus 543:
1.18 deraadt 544: if (c && (c->c_tv.tv_sec > now.tv_sec ||
545: (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
1.1 markus 546: seltime = c->c_tv;
547: seltime.tv_sec -= now.tv_sec;
548: seltime.tv_usec -= now.tv_usec;
1.13 itojun 549: if (seltime.tv_usec < 0) {
1.1 markus 550: seltime.tv_usec += 1000000;
551: seltime.tv_sec--;
552: }
553: } else
1.85 okan 554: timerclear(&seltime);
1.1 markus 555:
1.63 djm 556: r = xcalloc(read_wait_nfdset, sizeof(fd_mask));
557: e = xcalloc(read_wait_nfdset, sizeof(fd_mask));
558: memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask));
559: memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask));
1.19 millert 560:
561: while (select(maxfd, r, NULL, e, &seltime) == -1 &&
1.16 deraadt 562: (errno == EAGAIN || errno == EINTR))
563: ;
564:
1.18 deraadt 565: for (i = 0; i < maxfd; i++) {
1.19 millert 566: if (FD_ISSET(i, e)) {
1.1 markus 567: error("%s: exception!", fdcon[i].c_name);
568: confree(i);
1.19 millert 569: } else if (FD_ISSET(i, r))
1.1 markus 570: conread(i);
1.18 deraadt 571: }
1.87 djm 572: free(r);
573: free(e);
1.1 markus 574:
1.36 itojun 575: c = TAILQ_FIRST(&tq);
1.18 deraadt 576: while (c && (c->c_tv.tv_sec < now.tv_sec ||
577: (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
1.1 markus 578: int s = c->c_fd;
1.18 deraadt 579:
1.36 itojun 580: c = TAILQ_NEXT(c, c_link);
1.1 markus 581: conrecycle(s);
582: }
583: }
584:
1.26 markus 585: static void
586: do_host(char *host)
1.1 markus 587: {
1.26 markus 588: char *name = strnnsep(&host, " \t\n");
589: int j;
1.1 markus 590:
1.31 markus 591: if (name == NULL)
592: return;
1.89 markus 593: for (j = KT_RSA1; j <= KT_ED25519; j *= 2) {
1.26 markus 594: if (get_keytypes & j) {
595: while (ncon >= MAXCON)
596: conloop();
597: conalloc(name, *host ? host : name, j);
1.1 markus 598: }
599: }
600: }
601:
1.34 markus 602: void
603: fatal(const char *fmt,...)
1.26 markus 604: {
1.34 markus 605: va_list args;
1.39 deraadt 606:
1.34 markus 607: va_start(args, fmt);
608: do_log(SYSLOG_LEVEL_FATAL, fmt, args);
609: va_end(args);
1.95 markus 610: exit(255);
1.26 markus 611: }
612:
613: static void
1.1 markus 614: usage(void)
615: {
1.77 sobrado 616: fprintf(stderr,
617: "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n"
1.81 dtucker 618: "\t\t [host | addrlist namelist] ...\n",
1.25 jakob 619: __progname);
620: exit(1);
1.1 markus 621: }
622:
623: int
624: main(int argc, char **argv)
625: {
1.26 markus 626: int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
1.82 djm 627: int opt, fopt_count = 0, j;
628: char *tname, *cp, line[NI_MAXHOST];
629: FILE *fp;
630: u_long linenum;
1.26 markus 631:
632: extern int optind;
633: extern char *optarg;
1.1 markus 634:
635: TAILQ_INIT(&tq);
1.56 djm 636:
637: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
638: sanitise_stdfd();
1.1 markus 639:
1.26 markus 640: if (argc <= 1)
1.1 markus 641: usage();
642:
1.81 dtucker 643: while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) {
1.26 markus 644: switch (opt) {
1.51 djm 645: case 'H':
646: hash_hosts = 1;
647: break;
1.26 markus 648: case 'p':
649: ssh_port = a2port(optarg);
1.78 djm 650: if (ssh_port <= 0) {
1.26 markus 651: fprintf(stderr, "Bad port '%s'\n", optarg);
652: exit(1);
653: }
654: break;
655: case 'T':
1.38 stevesk 656: timeout = convtime(optarg);
657: if (timeout == -1 || timeout == 0) {
658: fprintf(stderr, "Bad timeout '%s'\n", optarg);
1.1 markus 659: usage();
1.38 stevesk 660: }
1.26 markus 661: break;
662: case 'v':
663: if (!debug_flag) {
664: debug_flag = 1;
665: log_level = SYSLOG_LEVEL_DEBUG1;
666: }
667: else if (log_level < SYSLOG_LEVEL_DEBUG3)
668: log_level++;
669: else
670: fatal("Too high debugging level.");
671: break;
672: case 'f':
673: if (strcmp(optarg, "-") == 0)
674: optarg = NULL;
675: argv[fopt_count++] = optarg;
676: break;
677: case 't':
678: get_keytypes = 0;
679: tname = strtok(optarg, ",");
680: while (tname) {
1.95 markus 681: int type = sshkey_type_from_name(tname);
1.26 markus 682: switch (type) {
683: case KEY_RSA1:
684: get_keytypes |= KT_RSA1;
685: break;
686: case KEY_DSA:
687: get_keytypes |= KT_DSA;
1.83 djm 688: break;
689: case KEY_ECDSA:
690: get_keytypes |= KT_ECDSA;
1.26 markus 691: break;
692: case KEY_RSA:
693: get_keytypes |= KT_RSA;
1.89 markus 694: break;
695: case KEY_ED25519:
696: get_keytypes |= KT_ED25519;
1.26 markus 697: break;
698: case KEY_UNSPEC:
1.32 stevesk 699: fatal("unknown key type %s", tname);
1.26 markus 700: }
701: tname = strtok(NULL, ",");
702: }
703: break;
704: case '4':
705: IPv4or6 = AF_INET;
706: break;
707: case '6':
708: IPv4or6 = AF_INET6;
709: break;
710: case '?':
711: default:
712: usage();
1.1 markus 713: }
714: }
1.26 markus 715: if (optind == argc && !fopt_count)
1.1 markus 716: usage();
717:
1.26 markus 718: log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
719:
1.1 markus 720: maxfd = fdlim_get(1);
721: if (maxfd < 0)
1.4 markus 722: fatal("%s: fdlim_get: bad value", __progname);
1.1 markus 723: if (maxfd > MAXMAXFD)
724: maxfd = MAXMAXFD;
1.18 deraadt 725: if (MAXCON <= 0)
1.4 markus 726: fatal("%s: not enough file descriptors", __progname);
1.1 markus 727: if (maxfd > fdlim_get(0))
728: fdlim_set(maxfd);
1.63 djm 729: fdcon = xcalloc(maxfd, sizeof(con));
1.19 millert 730:
1.63 djm 731: read_wait_nfdset = howmany(maxfd, NFDBITS);
732: read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));
1.1 markus 733:
1.82 djm 734: for (j = 0; j < fopt_count; j++) {
735: if (argv[j] == NULL)
736: fp = stdin;
737: else if ((fp = fopen(argv[j], "r")) == NULL)
738: fatal("%s: %s: %s", __progname, argv[j],
739: strerror(errno));
740: linenum = 0;
741:
742: while (read_keyfile_line(fp,
743: argv[j] == NULL ? "(stdin)" : argv[j], line, sizeof(line),
744: &linenum) != -1) {
745: /* Chomp off trailing whitespace and comments */
746: if ((cp = strchr(line, '#')) == NULL)
747: cp = line + strlen(line) - 1;
748: while (cp >= line) {
749: if (*cp == ' ' || *cp == '\t' ||
750: *cp == '\n' || *cp == '#')
751: *cp-- = '\0';
752: else
753: break;
754: }
755:
756: /* Skip empty lines */
757: if (*line == '\0')
1.28 danh 758: continue;
1.82 djm 759:
760: do_host(line);
1.26 markus 761: }
1.82 djm 762:
763: if (ferror(fp))
764: fatal("%s: %s: %s", __progname, argv[j],
765: strerror(errno));
766:
767: fclose(fp);
1.26 markus 768: }
769:
770: while (optind < argc)
771: do_host(argv[optind++]);
1.1 markus 772:
773: while (ncon > 0)
774: conloop();
775:
776: return (0);
777: }
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