Annotation of src/usr.bin/ssh/ssh-keyscan.c, Revision 1.119
1.119 ! jmc 1: /* $OpenBSD: ssh-keyscan.c,v 1.118 2018/02/23 15:58:38 markus 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"
1.95 markus 29: #include "sshbuf.h"
30: #include "sshkey.h"
1.73 deraadt 31: #include "cipher.h"
1.26 markus 32: #include "kex.h"
33: #include "compat.h"
34: #include "myproposal.h"
35: #include "packet.h"
36: #include "dispatch.h"
1.11 markus 37: #include "log.h"
1.18 deraadt 38: #include "atomicio.h"
1.26 markus 39: #include "misc.h"
1.51 djm 40: #include "hostfile.h"
1.95 markus 41: #include "ssherr.h"
42: #include "ssh_api.h"
1.117 djm 43: #include "dns.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:
1.112 djm 51: #define KT_DSA (1)
52: #define KT_RSA (1<<1)
53: #define KT_ECDSA (1<<2)
54: #define KT_ED25519 (1<<3)
1.118 markus 55: #define KT_XMSS (1<<4)
1.112 djm 56:
57: #define KT_MIN KT_DSA
1.118 markus 58: #define KT_MAX KT_XMSS
1.26 markus 59:
1.103 djm 60: int get_cert = 0;
1.90 djm 61: int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519;
1.1 markus 62:
1.51 djm 63: int hash_hosts = 0; /* Hash hostname on output */
64:
1.117 djm 65: int print_sshfp = 0; /* Print SSHFP records instead of known_hosts */
66:
1.1 markus 67: #define MAXMAXFD 256
68:
69: /* The number of seconds after which to give up on a TCP connection */
70: int timeout = 5;
71:
72: int maxfd;
1.18 deraadt 73: #define MAXCON (maxfd - 10)
1.1 markus 74:
1.3 markus 75: extern char *__progname;
1.19 millert 76: fd_set *read_wait;
1.63 djm 77: size_t read_wait_nfdset;
1.1 markus 78: int ncon;
79:
80: /*
81: * Keep a connection structure for each file descriptor. The state
82: * associated with file descriptor n is held in fdcon[n].
83: */
84: typedef struct Connection {
1.6 markus 85: u_char c_status; /* State of connection on this file desc. */
1.1 markus 86: #define CS_UNUSED 0 /* File descriptor unused */
87: #define CS_CON 1 /* Waiting to connect/read greeting */
88: #define CS_SIZE 2 /* Waiting to read initial packet size */
89: #define CS_KEYS 3 /* Waiting to read public key packet */
90: int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
91: int c_plen; /* Packet length field for ssh packet */
92: int c_len; /* Total bytes which must be read. */
93: int c_off; /* Length of data read so far. */
1.112 djm 94: int c_keytype; /* Only one of KT_* */
1.100 miod 95: sig_atomic_t c_done; /* SSH2 done */
1.1 markus 96: char *c_namebase; /* Address to free for c_name and c_namelist */
97: char *c_name; /* Hostname of connection for errors */
98: char *c_namelist; /* Pointer to other possible addresses */
99: char *c_output_name; /* Hostname of connection for output */
100: char *c_data; /* Data read from this fd */
1.95 markus 101: struct ssh *c_ssh; /* SSH-connection */
1.1 markus 102: struct timeval c_tv; /* Time at which connection gets aborted */
103: TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
104: } con;
105:
106: TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
107: con *fdcon;
108:
1.95 markus 109: static void keyprint(con *c, struct sshkey *key);
110:
1.24 itojun 111: static int
1.1 markus 112: fdlim_get(int hard)
113: {
114: struct rlimit rlfd;
1.17 deraadt 115:
1.1 markus 116: if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
117: return (-1);
118: if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
1.46 djm 119: return sysconf(_SC_OPEN_MAX);
1.1 markus 120: else
121: return hard ? rlfd.rlim_max : rlfd.rlim_cur;
122: }
123:
1.24 itojun 124: static int
1.1 markus 125: fdlim_set(int lim)
126: {
127: struct rlimit rlfd;
1.39 deraadt 128:
1.1 markus 129: if (lim <= 0)
130: return (-1);
131: if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
132: return (-1);
133: rlfd.rlim_cur = lim;
134: if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
135: return (-1);
136: return (0);
137: }
138:
139: /*
140: * This is an strsep function that returns a null field for adjacent
141: * separators. This is the same as the 4.4BSD strsep, but different from the
142: * one in the GNU libc.
143: */
1.24 itojun 144: static char *
1.1 markus 145: xstrsep(char **str, const char *delim)
146: {
147: char *s, *e;
148:
149: if (!**str)
150: return (NULL);
151:
152: s = *str;
153: e = s + strcspn(s, delim);
154:
155: if (*e != '\0')
156: *e++ = '\0';
157: *str = e;
158:
159: return (s);
160: }
161:
162: /*
163: * Get the next non-null token (like GNU strsep). Strsep() will return a
164: * null token for two adjacent separators, so we may have to loop.
165: */
1.24 itojun 166: static char *
1.1 markus 167: strnnsep(char **stringp, char *delim)
168: {
169: char *tok;
170:
171: do {
172: tok = xstrsep(stringp, delim);
173: } while (tok && *tok == '\0');
174: return (tok);
175: }
176:
1.26 markus 177:
178: static int
1.95 markus 179: key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh)
1.26 markus 180: {
1.95 markus 181: con *c;
182:
183: if ((c = ssh_get_app_data(ssh)) != NULL)
184: keyprint(c, hostkey);
185: /* always abort key exchange */
186: return -1;
1.26 markus 187: }
188:
189: static int
190: ssh2_capable(int remote_major, int remote_minor)
191: {
192: switch (remote_major) {
193: case 1:
194: if (remote_minor == 99)
195: return 1;
196: break;
197: case 2:
198: return 1;
199: default:
200: break;
201: }
202: return 0;
203: }
204:
1.95 markus 205: static void
1.26 markus 206: keygrab_ssh2(con *c)
207: {
1.91 markus 208: char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
1.95 markus 209: int r;
1.26 markus 210:
1.103 djm 211: switch (c->c_keytype) {
212: case KT_DSA:
213: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
214: "ssh-dss-cert-v01@openssh.com" : "ssh-dss";
215: break;
216: case KT_RSA:
217: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
218: "ssh-rsa-cert-v01@openssh.com" : "ssh-rsa";
219: break;
220: case KT_ED25519:
221: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
222: "ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519";
223: break;
1.118 markus 224: case KT_XMSS:
225: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
226: "ssh-xmss-cert-v01@openssh.com" : "ssh-xmss@openssh.com";
227: break;
1.103 djm 228: case KT_ECDSA:
229: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
230: "ecdsa-sha2-nistp256-cert-v01@openssh.com,"
231: "ecdsa-sha2-nistp384-cert-v01@openssh.com,"
232: "ecdsa-sha2-nistp521-cert-v01@openssh.com" :
233: "ecdsa-sha2-nistp256,"
234: "ecdsa-sha2-nistp384,"
235: "ecdsa-sha2-nistp521";
236: break;
237: default:
238: fatal("unknown key type %d", c->c_keytype);
239: break;
240: }
1.95 markus 241: if ((r = kex_setup(c->c_ssh, myproposal)) != 0) {
242: free(c->c_ssh);
243: fprintf(stderr, "kex_setup: %s\n", ssh_err(r));
244: exit(1);
245: }
1.92 markus 246: #ifdef WITH_OPENSSL
1.95 markus 247: c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
248: c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
1.106 djm 249: c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kexdh_client;
250: c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kexdh_client;
251: c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kexdh_client;
1.95 markus 252: c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
253: c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
254: c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kexecdh_client;
1.92 markus 255: #endif
1.95 markus 256: c->c_ssh->kex->kex[KEX_C25519_SHA256] = kexc25519_client;
257: ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper);
258: /*
259: * do the key-exchange until an error occurs or until
260: * the key_print_wrapper() callback sets c_done.
261: */
1.114 markus 262: ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done);
1.26 markus 263: }
264:
265: static void
1.108 djm 266: keyprint_one(const char *host, struct sshkey *key)
1.26 markus 267: {
1.102 djm 268: char *hostport;
1.108 djm 269: const char *known_host, *hashed;
1.51 djm 270:
1.117 djm 271: if (print_sshfp) {
272: export_dns_rr(host, key, stdout, 0);
273: return;
274: }
275:
1.108 djm 276: hostport = put_host_port(host, ssh_port);
1.109 djm 277: lowercase(hostport);
1.108 djm 278: if (hash_hosts && (hashed = host_hash(host, NULL, 0)) == NULL)
1.51 djm 279: fatal("host_hash failed");
1.108 djm 280: known_host = hash_hosts ? hashed : hostport;
1.103 djm 281: if (!get_cert)
1.108 djm 282: fprintf(stdout, "%s ", known_host);
1.95 markus 283: sshkey_write(key, stdout);
1.1 markus 284: fputs("\n", stdout);
1.101 djm 285: free(hostport);
1.102 djm 286: }
287:
288: static void
289: keyprint(con *c, struct sshkey *key)
290: {
291: char *hosts = c->c_output_name ? c->c_output_name : c->c_name;
292: char *host, *ohosts;
293:
294: if (key == NULL)
295: return;
1.103 djm 296: if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) {
1.102 djm 297: keyprint_one(hosts, key);
298: return;
299: }
300: ohosts = hosts = xstrdup(hosts);
301: while ((host = strsep(&hosts, ",")) != NULL)
302: keyprint_one(host, key);
303: free(ohosts);
1.1 markus 304: }
305:
1.24 itojun 306: static int
1.1 markus 307: tcpconnect(char *host)
308: {
309: struct addrinfo hints, *ai, *aitop;
310: char strport[NI_MAXSERV];
311: int gaierr, s = -1;
312:
1.26 markus 313: snprintf(strport, sizeof strport, "%d", ssh_port);
1.1 markus 314: memset(&hints, 0, sizeof(hints));
1.26 markus 315: hints.ai_family = IPv4or6;
1.1 markus 316: hints.ai_socktype = SOCK_STREAM;
1.97 djm 317: if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
318: error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
319: return -1;
320: }
1.1 markus 321: for (ai = aitop; ai; ai = ai->ai_next) {
1.81 dtucker 322: s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.1 markus 323: if (s < 0) {
324: error("socket: %s", strerror(errno));
325: continue;
326: }
1.49 djm 327: if (set_nonblock(s) == -1)
328: fatal("%s: set_nonblock(%d)", __func__, s);
1.1 markus 329: if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
330: errno != EINPROGRESS)
331: error("connect (`%s'): %s", host, strerror(errno));
332: else
333: break;
334: close(s);
335: s = -1;
336: }
337: freeaddrinfo(aitop);
338: return s;
339: }
340:
1.24 itojun 341: static int
1.26 markus 342: conalloc(char *iname, char *oname, int keytype)
1.1 markus 343: {
1.39 deraadt 344: char *namebase, *name, *namelist;
1.1 markus 345: int s;
346:
347: namebase = namelist = xstrdup(iname);
348:
349: do {
350: name = xstrsep(&namelist, ",");
351: if (!name) {
1.87 djm 352: free(namebase);
1.1 markus 353: return (-1);
354: }
355: } while ((s = tcpconnect(name)) < 0);
356:
357: if (s >= maxfd)
1.4 markus 358: fatal("conalloc: fdno %d too high", s);
1.1 markus 359: if (fdcon[s].c_status)
1.4 markus 360: fatal("conalloc: attempt to reuse fdno %d", s);
1.1 markus 361:
1.103 djm 362: debug3("%s: oname %s kt %d", __func__, oname, keytype);
1.1 markus 363: fdcon[s].c_fd = s;
364: fdcon[s].c_status = CS_CON;
365: fdcon[s].c_namebase = namebase;
366: fdcon[s].c_name = name;
367: fdcon[s].c_namelist = namelist;
368: fdcon[s].c_output_name = xstrdup(oname);
369: fdcon[s].c_data = (char *) &fdcon[s].c_plen;
370: fdcon[s].c_len = 4;
371: fdcon[s].c_off = 0;
1.26 markus 372: fdcon[s].c_keytype = keytype;
1.116 dtucker 373: monotime_tv(&fdcon[s].c_tv);
1.1 markus 374: fdcon[s].c_tv.tv_sec += timeout;
375: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
1.19 millert 376: FD_SET(s, read_wait);
1.1 markus 377: ncon++;
378: return (s);
379: }
380:
1.24 itojun 381: static void
1.1 markus 382: confree(int s)
383: {
384: if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
1.4 markus 385: fatal("confree: attempt to free bad fdno %d", s);
1.87 djm 386: free(fdcon[s].c_namebase);
387: free(fdcon[s].c_output_name);
1.1 markus 388: if (fdcon[s].c_status == CS_KEYS)
1.87 djm 389: free(fdcon[s].c_data);
1.1 markus 390: fdcon[s].c_status = CS_UNUSED;
1.26 markus 391: fdcon[s].c_keytype = 0;
1.95 markus 392: if (fdcon[s].c_ssh) {
393: ssh_packet_close(fdcon[s].c_ssh);
394: free(fdcon[s].c_ssh);
395: fdcon[s].c_ssh = NULL;
1.115 dtucker 396: } else
397: close(s);
1.1 markus 398: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
1.19 millert 399: FD_CLR(s, read_wait);
1.1 markus 400: ncon--;
401: }
402:
1.24 itojun 403: static void
1.1 markus 404: contouch(int s)
405: {
406: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
1.116 dtucker 407: monotime_tv(&fdcon[s].c_tv);
1.1 markus 408: fdcon[s].c_tv.tv_sec += timeout;
409: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
410: }
411:
1.24 itojun 412: static int
1.1 markus 413: conrecycle(int s)
414: {
1.39 deraadt 415: con *c = &fdcon[s];
1.1 markus 416: int ret;
417:
1.26 markus 418: ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
1.1 markus 419: confree(s);
420: return (ret);
421: }
422:
1.24 itojun 423: static void
1.1 markus 424: congreet(int s)
425: {
1.55 djm 426: int n = 0, remote_major = 0, remote_minor = 0;
1.26 markus 427: char buf[256], *cp;
1.33 markus 428: char remote_version[sizeof buf];
1.55 djm 429: size_t bufsiz;
1.1 markus 430: con *c = &fdcon[s];
431:
1.112 djm 432: /* send client banner */
433: n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
434: PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2);
435: if (n < 0 || (size_t)n >= sizeof(buf)) {
436: error("snprintf: buffer too small");
437: confree(s);
438: return;
439: }
440: if (atomicio(vwrite, s, buf, n) != (size_t)n) {
441: error("write (%s): %s", c->c_name, strerror(errno));
442: confree(s);
443: return;
444: }
445:
1.57 djm 446: for (;;) {
447: memset(buf, '\0', sizeof(buf));
448: bufsiz = sizeof(buf);
449: cp = buf;
450: while (bufsiz-- &&
451: (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
452: if (*cp == '\r')
453: *cp = '\n';
454: cp++;
455: }
456: if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
457: break;
1.27 markus 458: }
1.54 avsm 459: if (n == 0) {
460: switch (errno) {
461: case EPIPE:
462: error("%s: Connection closed by remote host", c->c_name);
463: break;
464: case ECONNREFUSED:
465: break;
466: default:
1.1 markus 467: error("read (%s): %s", c->c_name, strerror(errno));
1.54 avsm 468: break;
469: }
1.1 markus 470: conrecycle(s);
471: return;
472: }
1.21 millert 473: if (*cp != '\n' && *cp != '\r') {
1.1 markus 474: error("%s: bad greeting", c->c_name);
475: confree(s);
476: return;
477: }
1.21 millert 478: *cp = '\0';
1.98 djm 479: if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL)
480: fatal("ssh_packet_set_connection failed");
1.99 djm 481: ssh_packet_set_timeout(c->c_ssh, timeout, 1);
1.95 markus 482: ssh_set_app_data(c->c_ssh, c); /* back link */
1.33 markus 483: if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
484: &remote_major, &remote_minor, remote_version) == 3)
1.95 markus 485: c->c_ssh->compat = compat_datafellows(remote_version);
1.33 markus 486: else
1.95 markus 487: c->c_ssh->compat = 0;
1.112 djm 488: if (!ssh2_capable(remote_major, remote_minor)) {
489: debug("%s doesn't support ssh2", c->c_name);
1.33 markus 490: confree(s);
491: return;
1.26 markus 492: }
1.117 djm 493: fprintf(stderr, "%c %s:%d %s\n", print_sshfp ? ';' : '#',
494: c->c_name, ssh_port, chop(buf));
1.112 djm 495: keygrab_ssh2(c);
496: confree(s);
1.1 markus 497: }
498:
1.24 itojun 499: static void
1.1 markus 500: conread(int s)
501: {
1.39 deraadt 502: con *c = &fdcon[s];
1.54 avsm 503: size_t n;
1.1 markus 504:
505: if (c->c_status == CS_CON) {
506: congreet(s);
507: return;
508: }
1.50 avsm 509: n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
1.54 avsm 510: if (n == 0) {
1.1 markus 511: error("read (%s): %s", c->c_name, strerror(errno));
512: confree(s);
513: return;
514: }
515: c->c_off += n;
516:
517: if (c->c_off == c->c_len)
518: switch (c->c_status) {
519: case CS_SIZE:
520: c->c_plen = htonl(c->c_plen);
521: c->c_len = c->c_plen + 8 - (c->c_plen & 7);
522: c->c_off = 0;
523: c->c_data = xmalloc(c->c_len);
524: c->c_status = CS_KEYS;
525: break;
526: default:
1.4 markus 527: fatal("conread: invalid status %d", c->c_status);
1.1 markus 528: break;
529: }
530:
531: contouch(s);
532: }
533:
1.24 itojun 534: static void
1.1 markus 535: conloop(void)
536: {
1.39 deraadt 537: struct timeval seltime, now;
1.19 millert 538: fd_set *r, *e;
1.39 deraadt 539: con *c;
1.1 markus 540: int i;
541:
1.116 dtucker 542: monotime_tv(&now);
1.36 itojun 543: c = TAILQ_FIRST(&tq);
1.1 markus 544:
1.18 deraadt 545: if (c && (c->c_tv.tv_sec > now.tv_sec ||
546: (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
1.1 markus 547: seltime = c->c_tv;
548: seltime.tv_sec -= now.tv_sec;
549: seltime.tv_usec -= now.tv_usec;
1.13 itojun 550: if (seltime.tv_usec < 0) {
1.1 markus 551: seltime.tv_usec += 1000000;
552: seltime.tv_sec--;
553: }
554: } else
1.85 okan 555: timerclear(&seltime);
1.1 markus 556:
1.63 djm 557: r = xcalloc(read_wait_nfdset, sizeof(fd_mask));
558: e = xcalloc(read_wait_nfdset, sizeof(fd_mask));
559: memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask));
560: memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask));
1.19 millert 561:
562: while (select(maxfd, r, NULL, e, &seltime) == -1 &&
1.16 deraadt 563: (errno == EAGAIN || errno == EINTR))
564: ;
565:
1.18 deraadt 566: for (i = 0; i < maxfd; i++) {
1.19 millert 567: if (FD_ISSET(i, e)) {
1.1 markus 568: error("%s: exception!", fdcon[i].c_name);
569: confree(i);
1.19 millert 570: } else if (FD_ISSET(i, r))
1.1 markus 571: conread(i);
1.18 deraadt 572: }
1.87 djm 573: free(r);
574: free(e);
1.1 markus 575:
1.36 itojun 576: c = TAILQ_FIRST(&tq);
1.18 deraadt 577: while (c && (c->c_tv.tv_sec < now.tv_sec ||
578: (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
1.1 markus 579: int s = c->c_fd;
1.18 deraadt 580:
1.36 itojun 581: c = TAILQ_NEXT(c, c_link);
1.1 markus 582: conrecycle(s);
583: }
584: }
585:
1.26 markus 586: static void
587: do_host(char *host)
1.1 markus 588: {
1.26 markus 589: char *name = strnnsep(&host, " \t\n");
590: int j;
1.1 markus 591:
1.31 markus 592: if (name == NULL)
593: return;
1.112 djm 594: for (j = KT_MIN; j <= KT_MAX; j *= 2) {
1.26 markus 595: if (get_keytypes & j) {
596: while (ncon >= MAXCON)
597: conloop();
598: conalloc(name, *host ? host : name, j);
1.1 markus 599: }
600: }
601: }
602:
1.34 markus 603: void
604: fatal(const char *fmt,...)
1.26 markus 605: {
1.34 markus 606: va_list args;
1.39 deraadt 607:
1.34 markus 608: va_start(args, fmt);
609: do_log(SYSLOG_LEVEL_FATAL, fmt, args);
610: va_end(args);
1.95 markus 611: exit(255);
1.26 markus 612: }
613:
614: static void
1.1 markus 615: usage(void)
616: {
1.77 sobrado 617: fprintf(stderr,
1.117 djm 618: "usage: %s [-46cDHv] [-f file] [-p port] [-T timeout] [-t type]\n"
1.119 ! jmc 619: "\t\t [host | addrlist namelist]\n",
1.25 jakob 620: __progname);
621: exit(1);
1.1 markus 622: }
623:
624: int
625: main(int argc, char **argv)
626: {
1.26 markus 627: int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
1.82 djm 628: int opt, fopt_count = 0, j;
629: char *tname, *cp, line[NI_MAXHOST];
630: FILE *fp;
631: u_long linenum;
1.26 markus 632:
633: extern int optind;
634: extern char *optarg;
1.1 markus 635:
1.105 dtucker 636: ssh_malloc_init(); /* must be called before any mallocs */
1.1 markus 637: TAILQ_INIT(&tq);
1.56 djm 638:
639: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
640: sanitise_stdfd();
1.1 markus 641:
1.26 markus 642: if (argc <= 1)
1.1 markus 643: usage();
644:
1.117 djm 645: while ((opt = getopt(argc, argv, "cDHv46p:T:t:f:")) != -1) {
1.26 markus 646: switch (opt) {
1.51 djm 647: case 'H':
648: hash_hosts = 1;
1.103 djm 649: break;
650: case 'c':
651: get_cert = 1;
1.117 djm 652: break;
653: case 'D':
654: print_sshfp = 1;
1.51 djm 655: break;
1.26 markus 656: case 'p':
657: ssh_port = a2port(optarg);
1.78 djm 658: if (ssh_port <= 0) {
1.26 markus 659: fprintf(stderr, "Bad port '%s'\n", optarg);
660: exit(1);
661: }
662: break;
663: case 'T':
1.38 stevesk 664: timeout = convtime(optarg);
665: if (timeout == -1 || timeout == 0) {
666: fprintf(stderr, "Bad timeout '%s'\n", optarg);
1.1 markus 667: usage();
1.38 stevesk 668: }
1.26 markus 669: break;
670: case 'v':
671: if (!debug_flag) {
672: debug_flag = 1;
673: log_level = SYSLOG_LEVEL_DEBUG1;
674: }
675: else if (log_level < SYSLOG_LEVEL_DEBUG3)
676: log_level++;
677: else
678: fatal("Too high debugging level.");
679: break;
680: case 'f':
681: if (strcmp(optarg, "-") == 0)
682: optarg = NULL;
683: argv[fopt_count++] = optarg;
684: break;
685: case 't':
686: get_keytypes = 0;
687: tname = strtok(optarg, ",");
688: while (tname) {
1.95 markus 689: int type = sshkey_type_from_name(tname);
1.107 djm 690:
1.26 markus 691: switch (type) {
692: case KEY_DSA:
693: get_keytypes |= KT_DSA;
1.83 djm 694: break;
695: case KEY_ECDSA:
696: get_keytypes |= KT_ECDSA;
1.26 markus 697: break;
698: case KEY_RSA:
699: get_keytypes |= KT_RSA;
1.89 markus 700: break;
701: case KEY_ED25519:
702: get_keytypes |= KT_ED25519;
1.118 markus 703: break;
704: case KEY_XMSS:
705: get_keytypes |= KT_XMSS;
1.26 markus 706: break;
707: case KEY_UNSPEC:
1.107 djm 708: default:
709: fatal("Unknown key type \"%s\"", tname);
1.26 markus 710: }
711: tname = strtok(NULL, ",");
712: }
713: break;
714: case '4':
715: IPv4or6 = AF_INET;
716: break;
717: case '6':
718: IPv4or6 = AF_INET6;
719: break;
720: case '?':
721: default:
722: usage();
1.1 markus 723: }
724: }
1.26 markus 725: if (optind == argc && !fopt_count)
1.1 markus 726: usage();
727:
1.26 markus 728: log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
729:
1.1 markus 730: maxfd = fdlim_get(1);
731: if (maxfd < 0)
1.4 markus 732: fatal("%s: fdlim_get: bad value", __progname);
1.1 markus 733: if (maxfd > MAXMAXFD)
734: maxfd = MAXMAXFD;
1.18 deraadt 735: if (MAXCON <= 0)
1.4 markus 736: fatal("%s: not enough file descriptors", __progname);
1.1 markus 737: if (maxfd > fdlim_get(0))
738: fdlim_set(maxfd);
1.63 djm 739: fdcon = xcalloc(maxfd, sizeof(con));
1.19 millert 740:
1.63 djm 741: read_wait_nfdset = howmany(maxfd, NFDBITS);
742: read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));
1.1 markus 743:
1.82 djm 744: for (j = 0; j < fopt_count; j++) {
745: if (argv[j] == NULL)
746: fp = stdin;
747: else if ((fp = fopen(argv[j], "r")) == NULL)
748: fatal("%s: %s: %s", __progname, argv[j],
749: strerror(errno));
750: linenum = 0;
751:
752: while (read_keyfile_line(fp,
753: argv[j] == NULL ? "(stdin)" : argv[j], line, sizeof(line),
754: &linenum) != -1) {
755: /* Chomp off trailing whitespace and comments */
756: if ((cp = strchr(line, '#')) == NULL)
757: cp = line + strlen(line) - 1;
758: while (cp >= line) {
759: if (*cp == ' ' || *cp == '\t' ||
760: *cp == '\n' || *cp == '#')
761: *cp-- = '\0';
762: else
763: break;
764: }
765:
766: /* Skip empty lines */
767: if (*line == '\0')
1.28 danh 768: continue;
1.82 djm 769:
770: do_host(line);
1.26 markus 771: }
1.82 djm 772:
773: if (ferror(fp))
774: fatal("%s: %s: %s", __progname, argv[j],
775: strerror(errno));
776:
777: fclose(fp);
1.26 markus 778: }
779:
780: while (optind < argc)
781: do_host(argv[optind++]);
1.1 markus 782:
783: while (ncon > 0)
784: conloop();
785:
786: return (0);
787: }
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