Annotation of src/usr.bin/ssh/ssh-keyscan.c, Revision 1.111
1.111 ! djm 1: /* $OpenBSD: ssh-keyscan.c,v 1.110 2017/04/30 23:10:43 djm 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:
1.103 djm 57: int get_cert = 0;
1.90 djm 58: int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519;
1.1 markus 59:
1.51 djm 60: int hash_hosts = 0; /* Hash hostname on output */
61:
1.1 markus 62: #define MAXMAXFD 256
63:
64: /* The number of seconds after which to give up on a TCP connection */
65: int timeout = 5;
66:
67: int maxfd;
1.18 deraadt 68: #define MAXCON (maxfd - 10)
1.1 markus 69:
1.3 markus 70: extern char *__progname;
1.19 millert 71: fd_set *read_wait;
1.63 djm 72: size_t read_wait_nfdset;
1.1 markus 73: int ncon;
74:
75: /*
76: * Keep a connection structure for each file descriptor. The state
77: * associated with file descriptor n is held in fdcon[n].
78: */
79: typedef struct Connection {
1.6 markus 80: u_char c_status; /* State of connection on this file desc. */
1.1 markus 81: #define CS_UNUSED 0 /* File descriptor unused */
82: #define CS_CON 1 /* Waiting to connect/read greeting */
83: #define CS_SIZE 2 /* Waiting to read initial packet size */
84: #define CS_KEYS 3 /* Waiting to read public key packet */
85: int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
86: int c_plen; /* Packet length field for ssh packet */
87: int c_len; /* Total bytes which must be read. */
88: int c_off; /* Length of data read so far. */
1.26 markus 89: int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
1.100 miod 90: sig_atomic_t c_done; /* SSH2 done */
1.1 markus 91: char *c_namebase; /* Address to free for c_name and c_namelist */
92: char *c_name; /* Hostname of connection for errors */
93: char *c_namelist; /* Pointer to other possible addresses */
94: char *c_output_name; /* Hostname of connection for output */
95: char *c_data; /* Data read from this fd */
1.95 markus 96: struct ssh *c_ssh; /* SSH-connection */
1.1 markus 97: struct timeval c_tv; /* Time at which connection gets aborted */
98: TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
99: } con;
100:
101: TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
102: con *fdcon;
103:
1.95 markus 104: static void keyprint(con *c, struct sshkey *key);
105:
1.24 itojun 106: static int
1.1 markus 107: fdlim_get(int hard)
108: {
109: struct rlimit rlfd;
1.17 deraadt 110:
1.1 markus 111: if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
112: return (-1);
113: if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
1.46 djm 114: return sysconf(_SC_OPEN_MAX);
1.1 markus 115: else
116: return hard ? rlfd.rlim_max : rlfd.rlim_cur;
117: }
118:
1.24 itojun 119: static int
1.1 markus 120: fdlim_set(int lim)
121: {
122: struct rlimit rlfd;
1.39 deraadt 123:
1.1 markus 124: if (lim <= 0)
125: return (-1);
126: if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
127: return (-1);
128: rlfd.rlim_cur = lim;
129: if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
130: return (-1);
131: return (0);
132: }
133:
134: /*
135: * This is an strsep function that returns a null field for adjacent
136: * separators. This is the same as the 4.4BSD strsep, but different from the
137: * one in the GNU libc.
138: */
1.24 itojun 139: static char *
1.1 markus 140: xstrsep(char **str, const char *delim)
141: {
142: char *s, *e;
143:
144: if (!**str)
145: return (NULL);
146:
147: s = *str;
148: e = s + strcspn(s, delim);
149:
150: if (*e != '\0')
151: *e++ = '\0';
152: *str = e;
153:
154: return (s);
155: }
156:
157: /*
158: * Get the next non-null token (like GNU strsep). Strsep() will return a
159: * null token for two adjacent separators, so we may have to loop.
160: */
1.24 itojun 161: static char *
1.1 markus 162: strnnsep(char **stringp, char *delim)
163: {
164: char *tok;
165:
166: do {
167: tok = xstrsep(stringp, delim);
168: } while (tok && *tok == '\0');
169: return (tok);
170: }
171:
1.26 markus 172:
173: static int
1.95 markus 174: key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh)
1.26 markus 175: {
1.95 markus 176: con *c;
177:
178: if ((c = ssh_get_app_data(ssh)) != NULL)
179: keyprint(c, hostkey);
180: /* always abort key exchange */
181: return -1;
1.26 markus 182: }
183:
184: static int
185: ssh2_capable(int remote_major, int remote_minor)
186: {
187: switch (remote_major) {
188: case 1:
189: if (remote_minor == 99)
190: return 1;
191: break;
192: case 2:
193: return 1;
194: default:
195: break;
196: }
197: return 0;
198: }
199:
1.95 markus 200: static void
1.26 markus 201: keygrab_ssh2(con *c)
202: {
1.91 markus 203: char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
1.95 markus 204: int r;
1.26 markus 205:
1.103 djm 206: switch (c->c_keytype) {
207: case KT_DSA:
208: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
209: "ssh-dss-cert-v01@openssh.com" : "ssh-dss";
210: break;
211: case KT_RSA:
212: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
213: "ssh-rsa-cert-v01@openssh.com" : "ssh-rsa";
214: break;
215: case KT_ED25519:
216: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
217: "ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519";
218: break;
219: case KT_ECDSA:
220: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
221: "ecdsa-sha2-nistp256-cert-v01@openssh.com,"
222: "ecdsa-sha2-nistp384-cert-v01@openssh.com,"
223: "ecdsa-sha2-nistp521-cert-v01@openssh.com" :
224: "ecdsa-sha2-nistp256,"
225: "ecdsa-sha2-nistp384,"
226: "ecdsa-sha2-nistp521";
227: break;
228: default:
229: fatal("unknown key type %d", c->c_keytype);
230: break;
231: }
1.95 markus 232: if ((r = kex_setup(c->c_ssh, myproposal)) != 0) {
233: free(c->c_ssh);
234: fprintf(stderr, "kex_setup: %s\n", ssh_err(r));
235: exit(1);
236: }
1.92 markus 237: #ifdef WITH_OPENSSL
1.95 markus 238: c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
239: c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
1.106 djm 240: c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kexdh_client;
241: c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kexdh_client;
242: c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kexdh_client;
1.95 markus 243: c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
244: c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
245: c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kexecdh_client;
1.92 markus 246: #endif
1.95 markus 247: c->c_ssh->kex->kex[KEX_C25519_SHA256] = kexc25519_client;
248: ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper);
249: /*
250: * do the key-exchange until an error occurs or until
251: * the key_print_wrapper() callback sets c_done.
252: */
253: ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done, c->c_ssh);
1.26 markus 254: }
255:
256: static void
1.108 djm 257: keyprint_one(const char *host, struct sshkey *key)
1.26 markus 258: {
1.102 djm 259: char *hostport;
1.108 djm 260: const char *known_host, *hashed;
1.51 djm 261:
1.108 djm 262: hostport = put_host_port(host, ssh_port);
1.109 djm 263: lowercase(hostport);
1.108 djm 264: if (hash_hosts && (hashed = host_hash(host, NULL, 0)) == NULL)
1.51 djm 265: fatal("host_hash failed");
1.108 djm 266: known_host = hash_hosts ? hashed : hostport;
1.103 djm 267: if (!get_cert)
1.108 djm 268: fprintf(stdout, "%s ", known_host);
1.95 markus 269: sshkey_write(key, stdout);
1.1 markus 270: fputs("\n", stdout);
1.101 djm 271: free(hostport);
1.102 djm 272: }
273:
274: static void
275: keyprint(con *c, struct sshkey *key)
276: {
277: char *hosts = c->c_output_name ? c->c_output_name : c->c_name;
278: char *host, *ohosts;
279:
280: if (key == NULL)
281: return;
1.103 djm 282: if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) {
1.102 djm 283: keyprint_one(hosts, key);
284: return;
285: }
286: ohosts = hosts = xstrdup(hosts);
287: while ((host = strsep(&hosts, ",")) != NULL)
288: keyprint_one(host, key);
289: free(ohosts);
1.1 markus 290: }
291:
1.24 itojun 292: static int
1.1 markus 293: tcpconnect(char *host)
294: {
295: struct addrinfo hints, *ai, *aitop;
296: char strport[NI_MAXSERV];
297: int gaierr, s = -1;
298:
1.26 markus 299: snprintf(strport, sizeof strport, "%d", ssh_port);
1.1 markus 300: memset(&hints, 0, sizeof(hints));
1.26 markus 301: hints.ai_family = IPv4or6;
1.1 markus 302: hints.ai_socktype = SOCK_STREAM;
1.97 djm 303: if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
304: error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
305: return -1;
306: }
1.1 markus 307: for (ai = aitop; ai; ai = ai->ai_next) {
1.81 dtucker 308: s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.1 markus 309: if (s < 0) {
310: error("socket: %s", strerror(errno));
311: continue;
312: }
1.49 djm 313: if (set_nonblock(s) == -1)
314: fatal("%s: set_nonblock(%d)", __func__, s);
1.1 markus 315: if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
316: errno != EINPROGRESS)
317: error("connect (`%s'): %s", host, strerror(errno));
318: else
319: break;
320: close(s);
321: s = -1;
322: }
323: freeaddrinfo(aitop);
324: return s;
325: }
326:
1.24 itojun 327: static int
1.26 markus 328: conalloc(char *iname, char *oname, int keytype)
1.1 markus 329: {
1.39 deraadt 330: char *namebase, *name, *namelist;
1.1 markus 331: int s;
332:
333: namebase = namelist = xstrdup(iname);
334:
335: do {
336: name = xstrsep(&namelist, ",");
337: if (!name) {
1.87 djm 338: free(namebase);
1.1 markus 339: return (-1);
340: }
341: } while ((s = tcpconnect(name)) < 0);
342:
343: if (s >= maxfd)
1.4 markus 344: fatal("conalloc: fdno %d too high", s);
1.1 markus 345: if (fdcon[s].c_status)
1.4 markus 346: fatal("conalloc: attempt to reuse fdno %d", s);
1.1 markus 347:
1.103 djm 348: debug3("%s: oname %s kt %d", __func__, oname, keytype);
1.1 markus 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';
1.98 djm 451: if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL)
452: fatal("ssh_packet_set_connection failed");
1.99 djm 453: ssh_packet_set_timeout(c->c_ssh, timeout, 1);
1.95 markus 454: ssh_set_app_data(c->c_ssh, c); /* back link */
1.33 markus 455: if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
456: &remote_major, &remote_minor, remote_version) == 3)
1.95 markus 457: c->c_ssh->compat = compat_datafellows(remote_version);
1.33 markus 458: else
1.95 markus 459: c->c_ssh->compat = 0;
1.26 markus 460: if (c->c_keytype != KT_RSA1) {
461: if (!ssh2_capable(remote_major, remote_minor)) {
462: debug("%s doesn't support ssh2", c->c_name);
463: confree(s);
464: return;
465: }
1.33 markus 466: } else if (remote_major != 1) {
467: debug("%s doesn't support ssh1", c->c_name);
468: confree(s);
469: return;
1.26 markus 470: }
1.101 djm 471: fprintf(stderr, "# %s:%d %s\n", c->c_name, ssh_port, chop(buf));
1.26 markus 472: n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
473: c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
474: c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
1.55 djm 475: if (n < 0 || (size_t)n >= sizeof(buf)) {
1.53 moritz 476: error("snprintf: buffer too small");
477: confree(s);
478: return;
479: }
1.55 djm 480: if (atomicio(vwrite, s, buf, n) != (size_t)n) {
1.1 markus 481: error("write (%s): %s", c->c_name, strerror(errno));
482: confree(s);
483: return;
484: }
1.26 markus 485: if (c->c_keytype != KT_RSA1) {
1.95 markus 486: keygrab_ssh2(c);
1.26 markus 487: confree(s);
488: return;
489: }
1.1 markus 490: c->c_status = CS_SIZE;
491: contouch(s);
492: }
493:
1.24 itojun 494: static void
1.1 markus 495: conread(int s)
496: {
1.39 deraadt 497: con *c = &fdcon[s];
1.54 avsm 498: size_t n;
1.1 markus 499:
500: if (c->c_status == CS_CON) {
501: congreet(s);
502: return;
503: }
1.50 avsm 504: n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
1.54 avsm 505: if (n == 0) {
1.1 markus 506: error("read (%s): %s", c->c_name, strerror(errno));
507: confree(s);
508: return;
509: }
510: c->c_off += n;
511:
512: if (c->c_off == c->c_len)
513: switch (c->c_status) {
514: case CS_SIZE:
515: c->c_plen = htonl(c->c_plen);
516: c->c_len = c->c_plen + 8 - (c->c_plen & 7);
517: c->c_off = 0;
518: c->c_data = xmalloc(c->c_len);
519: c->c_status = CS_KEYS;
520: break;
521: default:
1.4 markus 522: fatal("conread: invalid status %d", c->c_status);
1.1 markus 523: break;
524: }
525:
526: contouch(s);
527: }
528:
1.24 itojun 529: static void
1.1 markus 530: conloop(void)
531: {
1.39 deraadt 532: struct timeval seltime, now;
1.19 millert 533: fd_set *r, *e;
1.39 deraadt 534: con *c;
1.1 markus 535: int i;
536:
537: gettimeofday(&now, NULL);
1.36 itojun 538: c = TAILQ_FIRST(&tq);
1.1 markus 539:
1.18 deraadt 540: if (c && (c->c_tv.tv_sec > now.tv_sec ||
541: (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
1.1 markus 542: seltime = c->c_tv;
543: seltime.tv_sec -= now.tv_sec;
544: seltime.tv_usec -= now.tv_usec;
1.13 itojun 545: if (seltime.tv_usec < 0) {
1.1 markus 546: seltime.tv_usec += 1000000;
547: seltime.tv_sec--;
548: }
549: } else
1.85 okan 550: timerclear(&seltime);
1.1 markus 551:
1.63 djm 552: r = xcalloc(read_wait_nfdset, sizeof(fd_mask));
553: e = xcalloc(read_wait_nfdset, sizeof(fd_mask));
554: memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask));
555: memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask));
1.19 millert 556:
557: while (select(maxfd, r, NULL, e, &seltime) == -1 &&
1.16 deraadt 558: (errno == EAGAIN || errno == EINTR))
559: ;
560:
1.18 deraadt 561: for (i = 0; i < maxfd; i++) {
1.19 millert 562: if (FD_ISSET(i, e)) {
1.1 markus 563: error("%s: exception!", fdcon[i].c_name);
564: confree(i);
1.19 millert 565: } else if (FD_ISSET(i, r))
1.1 markus 566: conread(i);
1.18 deraadt 567: }
1.87 djm 568: free(r);
569: free(e);
1.1 markus 570:
1.36 itojun 571: c = TAILQ_FIRST(&tq);
1.18 deraadt 572: while (c && (c->c_tv.tv_sec < now.tv_sec ||
573: (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
1.1 markus 574: int s = c->c_fd;
1.18 deraadt 575:
1.36 itojun 576: c = TAILQ_NEXT(c, c_link);
1.1 markus 577: conrecycle(s);
578: }
579: }
580:
1.26 markus 581: static void
582: do_host(char *host)
1.1 markus 583: {
1.26 markus 584: char *name = strnnsep(&host, " \t\n");
585: int j;
1.1 markus 586:
1.31 markus 587: if (name == NULL)
588: return;
1.89 markus 589: for (j = KT_RSA1; j <= KT_ED25519; j *= 2) {
1.26 markus 590: if (get_keytypes & j) {
591: while (ncon >= MAXCON)
592: conloop();
593: conalloc(name, *host ? host : name, j);
1.1 markus 594: }
595: }
596: }
597:
1.34 markus 598: void
599: fatal(const char *fmt,...)
1.26 markus 600: {
1.34 markus 601: va_list args;
1.39 deraadt 602:
1.34 markus 603: va_start(args, fmt);
604: do_log(SYSLOG_LEVEL_FATAL, fmt, args);
605: va_end(args);
1.95 markus 606: exit(255);
1.26 markus 607: }
608:
609: static void
1.1 markus 610: usage(void)
611: {
1.77 sobrado 612: fprintf(stderr,
1.104 jmc 613: "usage: %s [-46cHv] [-f file] [-p port] [-T timeout] [-t type]\n"
1.81 dtucker 614: "\t\t [host | addrlist namelist] ...\n",
1.25 jakob 615: __progname);
616: exit(1);
1.1 markus 617: }
618:
619: int
620: main(int argc, char **argv)
621: {
1.26 markus 622: int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
1.82 djm 623: int opt, fopt_count = 0, j;
624: char *tname, *cp, line[NI_MAXHOST];
625: FILE *fp;
626: u_long linenum;
1.26 markus 627:
628: extern int optind;
629: extern char *optarg;
1.1 markus 630:
1.105 dtucker 631: ssh_malloc_init(); /* must be called before any mallocs */
1.1 markus 632: TAILQ_INIT(&tq);
1.56 djm 633:
634: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
635: sanitise_stdfd();
1.1 markus 636:
1.26 markus 637: if (argc <= 1)
1.1 markus 638: usage();
639:
1.103 djm 640: while ((opt = getopt(argc, argv, "cHv46p:T:t:f:")) != -1) {
1.26 markus 641: switch (opt) {
1.51 djm 642: case 'H':
643: hash_hosts = 1;
1.103 djm 644: break;
645: case 'c':
646: get_cert = 1;
1.51 djm 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);
1.107 djm 682:
1.26 markus 683: switch (type) {
684: case KEY_DSA:
685: get_keytypes |= KT_DSA;
1.83 djm 686: break;
687: case KEY_ECDSA:
688: get_keytypes |= KT_ECDSA;
1.26 markus 689: break;
690: case KEY_RSA:
691: get_keytypes |= KT_RSA;
1.89 markus 692: break;
693: case KEY_ED25519:
694: get_keytypes |= KT_ED25519;
1.26 markus 695: break;
696: case KEY_UNSPEC:
1.107 djm 697: default:
698: fatal("Unknown key type \"%s\"", tname);
1.26 markus 699: }
700: tname = strtok(NULL, ",");
701: }
702: break;
703: case '4':
704: IPv4or6 = AF_INET;
705: break;
706: case '6':
707: IPv4or6 = AF_INET6;
708: break;
709: case '?':
710: default:
711: usage();
1.1 markus 712: }
713: }
1.26 markus 714: if (optind == argc && !fopt_count)
1.1 markus 715: usage();
716:
1.26 markus 717: log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
718:
1.1 markus 719: maxfd = fdlim_get(1);
720: if (maxfd < 0)
1.4 markus 721: fatal("%s: fdlim_get: bad value", __progname);
1.1 markus 722: if (maxfd > MAXMAXFD)
723: maxfd = MAXMAXFD;
1.18 deraadt 724: if (MAXCON <= 0)
1.4 markus 725: fatal("%s: not enough file descriptors", __progname);
1.1 markus 726: if (maxfd > fdlim_get(0))
727: fdlim_set(maxfd);
1.63 djm 728: fdcon = xcalloc(maxfd, sizeof(con));
1.19 millert 729:
1.63 djm 730: read_wait_nfdset = howmany(maxfd, NFDBITS);
731: read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));
1.1 markus 732:
1.82 djm 733: for (j = 0; j < fopt_count; j++) {
734: if (argv[j] == NULL)
735: fp = stdin;
736: else if ((fp = fopen(argv[j], "r")) == NULL)
737: fatal("%s: %s: %s", __progname, argv[j],
738: strerror(errno));
739: linenum = 0;
740:
741: while (read_keyfile_line(fp,
742: argv[j] == NULL ? "(stdin)" : argv[j], line, sizeof(line),
743: &linenum) != -1) {
744: /* Chomp off trailing whitespace and comments */
745: if ((cp = strchr(line, '#')) == NULL)
746: cp = line + strlen(line) - 1;
747: while (cp >= line) {
748: if (*cp == ' ' || *cp == '\t' ||
749: *cp == '\n' || *cp == '#')
750: *cp-- = '\0';
751: else
752: break;
753: }
754:
755: /* Skip empty lines */
756: if (*line == '\0')
1.28 danh 757: continue;
1.82 djm 758:
759: do_host(line);
1.26 markus 760: }
1.82 djm 761:
762: if (ferror(fp))
763: fatal("%s: %s: %s", __progname, argv[j],
764: strerror(errno));
765:
766: fclose(fp);
1.26 markus 767: }
768:
769: while (optind < argc)
770: do_host(argv[optind++]);
1.1 markus 771:
772: while (ncon > 0)
773: conloop();
774:
775: return (0);
776: }
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