Annotation of src/usr.bin/ssh/ssh-keyscan.c, Revision 1.130
1.130 ! djm 1: /* $OpenBSD: ssh-keyscan.c,v 1.129 2019/07/12 04:08:39 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:
1.130 ! djm 16: #ifdef WITH_OPENSSL
1.69 stevesk 17: #include <openssl/bn.h>
1.130 ! djm 18: #endif
1.69 stevesk 19:
1.1 markus 20: #include <errno.h>
1.67 stevesk 21: #include <netdb.h>
1.66 stevesk 22: #include <stdarg.h>
1.72 stevesk 23: #include <stdio.h>
1.71 stevesk 24: #include <stdlib.h>
1.73 deraadt 25: #include <signal.h>
1.69 stevesk 26: #include <string.h>
1.68 stevesk 27: #include <unistd.h>
1.1 markus 28:
29: #include "xmalloc.h"
30: #include "ssh.h"
1.95 markus 31: #include "sshbuf.h"
32: #include "sshkey.h"
1.73 deraadt 33: #include "cipher.h"
1.26 markus 34: #include "kex.h"
35: #include "compat.h"
36: #include "myproposal.h"
37: #include "packet.h"
38: #include "dispatch.h"
1.11 markus 39: #include "log.h"
1.18 deraadt 40: #include "atomicio.h"
1.26 markus 41: #include "misc.h"
1.51 djm 42: #include "hostfile.h"
1.95 markus 43: #include "ssherr.h"
44: #include "ssh_api.h"
1.117 djm 45: #include "dns.h"
1.1 markus 46:
1.26 markus 47: /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
48: Default value is AF_UNSPEC means both IPv4 and IPv6. */
49: int IPv4or6 = AF_UNSPEC;
50:
51: int ssh_port = SSH_DEFAULT_PORT;
1.1 markus 52:
1.112 djm 53: #define KT_DSA (1)
54: #define KT_RSA (1<<1)
55: #define KT_ECDSA (1<<2)
56: #define KT_ED25519 (1<<3)
1.118 markus 57: #define KT_XMSS (1<<4)
1.112 djm 58:
59: #define KT_MIN KT_DSA
1.118 markus 60: #define KT_MAX KT_XMSS
1.26 markus 61:
1.103 djm 62: int get_cert = 0;
1.90 djm 63: int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519;
1.1 markus 64:
1.51 djm 65: int hash_hosts = 0; /* Hash hostname on output */
66:
1.117 djm 67: int print_sshfp = 0; /* Print SSHFP records instead of known_hosts */
68:
1.126 djm 69: int found_one = 0; /* Successfully found a key */
70:
1.1 markus 71: #define MAXMAXFD 256
72:
73: /* The number of seconds after which to give up on a TCP connection */
74: int timeout = 5;
75:
76: int maxfd;
1.18 deraadt 77: #define MAXCON (maxfd - 10)
1.1 markus 78:
1.3 markus 79: extern char *__progname;
1.19 millert 80: fd_set *read_wait;
1.63 djm 81: size_t read_wait_nfdset;
1.1 markus 82: int ncon;
83:
84: /*
85: * Keep a connection structure for each file descriptor. The state
86: * associated with file descriptor n is held in fdcon[n].
87: */
88: typedef struct Connection {
1.6 markus 89: u_char c_status; /* State of connection on this file desc. */
1.1 markus 90: #define CS_UNUSED 0 /* File descriptor unused */
91: #define CS_CON 1 /* Waiting to connect/read greeting */
92: #define CS_SIZE 2 /* Waiting to read initial packet size */
93: #define CS_KEYS 3 /* Waiting to read public key packet */
94: int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
95: int c_plen; /* Packet length field for ssh packet */
96: int c_len; /* Total bytes which must be read. */
97: int c_off; /* Length of data read so far. */
1.112 djm 98: int c_keytype; /* Only one of KT_* */
1.100 miod 99: sig_atomic_t c_done; /* SSH2 done */
1.1 markus 100: char *c_namebase; /* Address to free for c_name and c_namelist */
101: char *c_name; /* Hostname of connection for errors */
102: char *c_namelist; /* Pointer to other possible addresses */
103: char *c_output_name; /* Hostname of connection for output */
104: char *c_data; /* Data read from this fd */
1.95 markus 105: struct ssh *c_ssh; /* SSH-connection */
1.1 markus 106: struct timeval c_tv; /* Time at which connection gets aborted */
107: TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
108: } con;
109:
110: TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
111: con *fdcon;
112:
1.95 markus 113: static void keyprint(con *c, struct sshkey *key);
114:
1.24 itojun 115: static int
1.1 markus 116: fdlim_get(int hard)
117: {
118: struct rlimit rlfd;
1.17 deraadt 119:
1.128 deraadt 120: if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1)
1.1 markus 121: return (-1);
122: if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
1.46 djm 123: return sysconf(_SC_OPEN_MAX);
1.1 markus 124: else
125: return hard ? rlfd.rlim_max : rlfd.rlim_cur;
126: }
127:
1.24 itojun 128: static int
1.1 markus 129: fdlim_set(int lim)
130: {
131: struct rlimit rlfd;
1.39 deraadt 132:
1.1 markus 133: if (lim <= 0)
134: return (-1);
1.128 deraadt 135: if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1)
1.1 markus 136: return (-1);
137: rlfd.rlim_cur = lim;
1.128 deraadt 138: if (setrlimit(RLIMIT_NOFILE, &rlfd) == -1)
1.1 markus 139: return (-1);
140: return (0);
141: }
142:
143: /*
144: * This is an strsep function that returns a null field for adjacent
145: * separators. This is the same as the 4.4BSD strsep, but different from the
146: * one in the GNU libc.
147: */
1.24 itojun 148: static char *
1.1 markus 149: xstrsep(char **str, const char *delim)
150: {
151: char *s, *e;
152:
153: if (!**str)
154: return (NULL);
155:
156: s = *str;
157: e = s + strcspn(s, delim);
158:
159: if (*e != '\0')
160: *e++ = '\0';
161: *str = e;
162:
163: return (s);
164: }
165:
166: /*
167: * Get the next non-null token (like GNU strsep). Strsep() will return a
168: * null token for two adjacent separators, so we may have to loop.
169: */
1.24 itojun 170: static char *
1.1 markus 171: strnnsep(char **stringp, char *delim)
172: {
173: char *tok;
174:
175: do {
176: tok = xstrsep(stringp, delim);
177: } while (tok && *tok == '\0');
178: return (tok);
179: }
180:
1.26 markus 181:
182: static int
1.95 markus 183: key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh)
1.26 markus 184: {
1.95 markus 185: con *c;
186:
187: if ((c = ssh_get_app_data(ssh)) != NULL)
188: keyprint(c, hostkey);
189: /* always abort key exchange */
190: return -1;
1.26 markus 191: }
192:
193: static int
194: ssh2_capable(int remote_major, int remote_minor)
195: {
196: switch (remote_major) {
197: case 1:
198: if (remote_minor == 99)
199: return 1;
200: break;
201: case 2:
202: return 1;
203: default:
204: break;
205: }
206: return 0;
207: }
208:
1.95 markus 209: static void
1.26 markus 210: keygrab_ssh2(con *c)
211: {
1.91 markus 212: char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
1.95 markus 213: int r;
1.26 markus 214:
1.103 djm 215: switch (c->c_keytype) {
216: case KT_DSA:
217: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
218: "ssh-dss-cert-v01@openssh.com" : "ssh-dss";
219: break;
220: case KT_RSA:
221: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
1.129 djm 222: "rsa-sha2-512-cert-v01@openssh.com,"
223: "rsa-sha2-256-cert-v01@openssh.com,"
224: "ssh-rsa-cert-v01@openssh.com" :
225: "rsa-sha2-512,"
226: "rsa-sha2-256,"
227: "ssh-rsa";
1.103 djm 228: break;
229: case KT_ED25519:
230: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
231: "ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519";
232: break;
1.118 markus 233: case KT_XMSS:
234: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
235: "ssh-xmss-cert-v01@openssh.com" : "ssh-xmss@openssh.com";
236: break;
1.103 djm 237: case KT_ECDSA:
238: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
239: "ecdsa-sha2-nistp256-cert-v01@openssh.com,"
240: "ecdsa-sha2-nistp384-cert-v01@openssh.com,"
241: "ecdsa-sha2-nistp521-cert-v01@openssh.com" :
242: "ecdsa-sha2-nistp256,"
243: "ecdsa-sha2-nistp384,"
244: "ecdsa-sha2-nistp521";
245: break;
246: default:
247: fatal("unknown key type %d", c->c_keytype);
248: break;
249: }
1.95 markus 250: if ((r = kex_setup(c->c_ssh, myproposal)) != 0) {
251: free(c->c_ssh);
252: fprintf(stderr, "kex_setup: %s\n", ssh_err(r));
253: exit(1);
254: }
1.92 markus 255: #ifdef WITH_OPENSSL
1.125 djm 256: c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_client;
257: c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_client;
258: c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_client;
259: c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_client;
260: c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_client;
1.95 markus 261: c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
262: c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
1.125 djm 263: c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kex_gen_client;
1.92 markus 264: #endif
1.125 djm 265: c->c_ssh->kex->kex[KEX_C25519_SHA256] = kex_gen_client;
266: c->c_ssh->kex->kex[KEX_KEM_SNTRUP4591761X25519_SHA512] = kex_gen_client;
1.95 markus 267: ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper);
268: /*
269: * do the key-exchange until an error occurs or until
270: * the key_print_wrapper() callback sets c_done.
271: */
1.114 markus 272: ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done);
1.26 markus 273: }
274:
275: static void
1.108 djm 276: keyprint_one(const char *host, struct sshkey *key)
1.26 markus 277: {
1.102 djm 278: char *hostport;
1.108 djm 279: const char *known_host, *hashed;
1.51 djm 280:
1.126 djm 281: found_one = 1;
282:
1.117 djm 283: if (print_sshfp) {
284: export_dns_rr(host, key, stdout, 0);
285: return;
286: }
287:
1.108 djm 288: hostport = put_host_port(host, ssh_port);
1.109 djm 289: lowercase(hostport);
1.108 djm 290: if (hash_hosts && (hashed = host_hash(host, NULL, 0)) == NULL)
1.51 djm 291: fatal("host_hash failed");
1.108 djm 292: known_host = hash_hosts ? hashed : hostport;
1.103 djm 293: if (!get_cert)
1.108 djm 294: fprintf(stdout, "%s ", known_host);
1.95 markus 295: sshkey_write(key, stdout);
1.1 markus 296: fputs("\n", stdout);
1.101 djm 297: free(hostport);
1.102 djm 298: }
299:
300: static void
301: keyprint(con *c, struct sshkey *key)
302: {
303: char *hosts = c->c_output_name ? c->c_output_name : c->c_name;
304: char *host, *ohosts;
305:
306: if (key == NULL)
307: return;
1.103 djm 308: if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) {
1.102 djm 309: keyprint_one(hosts, key);
310: return;
311: }
312: ohosts = hosts = xstrdup(hosts);
313: while ((host = strsep(&hosts, ",")) != NULL)
314: keyprint_one(host, key);
315: free(ohosts);
1.1 markus 316: }
317:
1.24 itojun 318: static int
1.1 markus 319: tcpconnect(char *host)
320: {
321: struct addrinfo hints, *ai, *aitop;
322: char strport[NI_MAXSERV];
323: int gaierr, s = -1;
324:
1.26 markus 325: snprintf(strport, sizeof strport, "%d", ssh_port);
1.1 markus 326: memset(&hints, 0, sizeof(hints));
1.26 markus 327: hints.ai_family = IPv4or6;
1.1 markus 328: hints.ai_socktype = SOCK_STREAM;
1.97 djm 329: if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
330: error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
331: return -1;
332: }
1.1 markus 333: for (ai = aitop; ai; ai = ai->ai_next) {
1.81 dtucker 334: s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.128 deraadt 335: if (s == -1) {
1.1 markus 336: error("socket: %s", strerror(errno));
337: continue;
338: }
1.49 djm 339: if (set_nonblock(s) == -1)
340: fatal("%s: set_nonblock(%d)", __func__, s);
1.128 deraadt 341: if (connect(s, ai->ai_addr, ai->ai_addrlen) == -1 &&
1.1 markus 342: errno != EINPROGRESS)
343: error("connect (`%s'): %s", host, strerror(errno));
344: else
345: break;
346: close(s);
347: s = -1;
348: }
349: freeaddrinfo(aitop);
350: return s;
351: }
352:
1.24 itojun 353: static int
1.26 markus 354: conalloc(char *iname, char *oname, int keytype)
1.1 markus 355: {
1.39 deraadt 356: char *namebase, *name, *namelist;
1.1 markus 357: int s;
358:
359: namebase = namelist = xstrdup(iname);
360:
361: do {
362: name = xstrsep(&namelist, ",");
363: if (!name) {
1.87 djm 364: free(namebase);
1.1 markus 365: return (-1);
366: }
367: } while ((s = tcpconnect(name)) < 0);
368:
369: if (s >= maxfd)
1.4 markus 370: fatal("conalloc: fdno %d too high", s);
1.1 markus 371: if (fdcon[s].c_status)
1.4 markus 372: fatal("conalloc: attempt to reuse fdno %d", s);
1.1 markus 373:
1.103 djm 374: debug3("%s: oname %s kt %d", __func__, oname, keytype);
1.1 markus 375: fdcon[s].c_fd = s;
376: fdcon[s].c_status = CS_CON;
377: fdcon[s].c_namebase = namebase;
378: fdcon[s].c_name = name;
379: fdcon[s].c_namelist = namelist;
380: fdcon[s].c_output_name = xstrdup(oname);
381: fdcon[s].c_data = (char *) &fdcon[s].c_plen;
382: fdcon[s].c_len = 4;
383: fdcon[s].c_off = 0;
1.26 markus 384: fdcon[s].c_keytype = keytype;
1.116 dtucker 385: monotime_tv(&fdcon[s].c_tv);
1.1 markus 386: fdcon[s].c_tv.tv_sec += timeout;
387: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
1.19 millert 388: FD_SET(s, read_wait);
1.1 markus 389: ncon++;
390: return (s);
391: }
392:
1.24 itojun 393: static void
1.1 markus 394: confree(int s)
395: {
396: if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
1.4 markus 397: fatal("confree: attempt to free bad fdno %d", s);
1.87 djm 398: free(fdcon[s].c_namebase);
399: free(fdcon[s].c_output_name);
1.1 markus 400: if (fdcon[s].c_status == CS_KEYS)
1.87 djm 401: free(fdcon[s].c_data);
1.1 markus 402: fdcon[s].c_status = CS_UNUSED;
1.26 markus 403: fdcon[s].c_keytype = 0;
1.95 markus 404: if (fdcon[s].c_ssh) {
405: ssh_packet_close(fdcon[s].c_ssh);
406: free(fdcon[s].c_ssh);
407: fdcon[s].c_ssh = NULL;
1.115 dtucker 408: } else
409: close(s);
1.1 markus 410: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
1.19 millert 411: FD_CLR(s, read_wait);
1.1 markus 412: ncon--;
413: }
414:
1.24 itojun 415: static void
1.1 markus 416: contouch(int s)
417: {
418: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
1.116 dtucker 419: monotime_tv(&fdcon[s].c_tv);
1.1 markus 420: fdcon[s].c_tv.tv_sec += timeout;
421: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
422: }
423:
1.24 itojun 424: static int
1.1 markus 425: conrecycle(int s)
426: {
1.39 deraadt 427: con *c = &fdcon[s];
1.1 markus 428: int ret;
429:
1.26 markus 430: ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
1.1 markus 431: confree(s);
432: return (ret);
433: }
434:
1.24 itojun 435: static void
1.1 markus 436: congreet(int s)
437: {
1.55 djm 438: int n = 0, remote_major = 0, remote_minor = 0;
1.26 markus 439: char buf[256], *cp;
1.33 markus 440: char remote_version[sizeof buf];
1.55 djm 441: size_t bufsiz;
1.1 markus 442: con *c = &fdcon[s];
443:
1.112 djm 444: /* send client banner */
445: n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
446: PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2);
447: if (n < 0 || (size_t)n >= sizeof(buf)) {
448: error("snprintf: buffer too small");
449: confree(s);
450: return;
451: }
452: if (atomicio(vwrite, s, buf, n) != (size_t)n) {
453: error("write (%s): %s", c->c_name, strerror(errno));
454: confree(s);
455: return;
456: }
457:
1.57 djm 458: for (;;) {
459: memset(buf, '\0', sizeof(buf));
460: bufsiz = sizeof(buf);
461: cp = buf;
462: while (bufsiz-- &&
463: (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
464: if (*cp == '\r')
465: *cp = '\n';
466: cp++;
467: }
468: if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
469: break;
1.27 markus 470: }
1.54 avsm 471: if (n == 0) {
472: switch (errno) {
473: case EPIPE:
474: error("%s: Connection closed by remote host", c->c_name);
475: break;
476: case ECONNREFUSED:
477: break;
478: default:
1.1 markus 479: error("read (%s): %s", c->c_name, strerror(errno));
1.54 avsm 480: break;
481: }
1.1 markus 482: conrecycle(s);
483: return;
484: }
1.21 millert 485: if (*cp != '\n' && *cp != '\r') {
1.1 markus 486: error("%s: bad greeting", c->c_name);
487: confree(s);
488: return;
489: }
1.21 millert 490: *cp = '\0';
1.98 djm 491: if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL)
492: fatal("ssh_packet_set_connection failed");
1.99 djm 493: ssh_packet_set_timeout(c->c_ssh, timeout, 1);
1.95 markus 494: ssh_set_app_data(c->c_ssh, c); /* back link */
1.33 markus 495: if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
496: &remote_major, &remote_minor, remote_version) == 3)
1.95 markus 497: c->c_ssh->compat = compat_datafellows(remote_version);
1.33 markus 498: else
1.95 markus 499: c->c_ssh->compat = 0;
1.112 djm 500: if (!ssh2_capable(remote_major, remote_minor)) {
501: debug("%s doesn't support ssh2", c->c_name);
1.33 markus 502: confree(s);
503: return;
1.26 markus 504: }
1.117 djm 505: fprintf(stderr, "%c %s:%d %s\n", print_sshfp ? ';' : '#',
506: c->c_name, ssh_port, chop(buf));
1.112 djm 507: keygrab_ssh2(c);
508: confree(s);
1.1 markus 509: }
510:
1.24 itojun 511: static void
1.1 markus 512: conread(int s)
513: {
1.39 deraadt 514: con *c = &fdcon[s];
1.54 avsm 515: size_t n;
1.1 markus 516:
517: if (c->c_status == CS_CON) {
518: congreet(s);
519: return;
520: }
1.50 avsm 521: n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
1.54 avsm 522: if (n == 0) {
1.1 markus 523: error("read (%s): %s", c->c_name, strerror(errno));
524: confree(s);
525: return;
526: }
527: c->c_off += n;
528:
529: if (c->c_off == c->c_len)
530: switch (c->c_status) {
531: case CS_SIZE:
532: c->c_plen = htonl(c->c_plen);
533: c->c_len = c->c_plen + 8 - (c->c_plen & 7);
534: c->c_off = 0;
535: c->c_data = xmalloc(c->c_len);
536: c->c_status = CS_KEYS;
537: break;
538: default:
1.4 markus 539: fatal("conread: invalid status %d", c->c_status);
1.1 markus 540: break;
541: }
542:
543: contouch(s);
544: }
545:
1.24 itojun 546: static void
1.1 markus 547: conloop(void)
548: {
1.39 deraadt 549: struct timeval seltime, now;
1.19 millert 550: fd_set *r, *e;
1.39 deraadt 551: con *c;
1.1 markus 552: int i;
553:
1.116 dtucker 554: monotime_tv(&now);
1.36 itojun 555: c = TAILQ_FIRST(&tq);
1.1 markus 556:
1.18 deraadt 557: if (c && (c->c_tv.tv_sec > now.tv_sec ||
558: (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
1.1 markus 559: seltime = c->c_tv;
560: seltime.tv_sec -= now.tv_sec;
561: seltime.tv_usec -= now.tv_usec;
1.13 itojun 562: if (seltime.tv_usec < 0) {
1.1 markus 563: seltime.tv_usec += 1000000;
564: seltime.tv_sec--;
565: }
566: } else
1.85 okan 567: timerclear(&seltime);
1.1 markus 568:
1.63 djm 569: r = xcalloc(read_wait_nfdset, sizeof(fd_mask));
570: e = xcalloc(read_wait_nfdset, sizeof(fd_mask));
571: memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask));
572: memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask));
1.19 millert 573:
574: while (select(maxfd, r, NULL, e, &seltime) == -1 &&
1.16 deraadt 575: (errno == EAGAIN || errno == EINTR))
576: ;
577:
1.18 deraadt 578: for (i = 0; i < maxfd; i++) {
1.19 millert 579: if (FD_ISSET(i, e)) {
1.1 markus 580: error("%s: exception!", fdcon[i].c_name);
581: confree(i);
1.19 millert 582: } else if (FD_ISSET(i, r))
1.1 markus 583: conread(i);
1.18 deraadt 584: }
1.87 djm 585: free(r);
586: free(e);
1.1 markus 587:
1.36 itojun 588: c = TAILQ_FIRST(&tq);
1.18 deraadt 589: while (c && (c->c_tv.tv_sec < now.tv_sec ||
590: (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
1.1 markus 591: int s = c->c_fd;
1.18 deraadt 592:
1.36 itojun 593: c = TAILQ_NEXT(c, c_link);
1.1 markus 594: conrecycle(s);
595: }
596: }
597:
1.26 markus 598: static void
599: do_host(char *host)
1.1 markus 600: {
1.26 markus 601: char *name = strnnsep(&host, " \t\n");
602: int j;
1.1 markus 603:
1.31 markus 604: if (name == NULL)
605: return;
1.112 djm 606: for (j = KT_MIN; j <= KT_MAX; j *= 2) {
1.26 markus 607: if (get_keytypes & j) {
608: while (ncon >= MAXCON)
609: conloop();
610: conalloc(name, *host ? host : name, j);
1.1 markus 611: }
612: }
613: }
614:
1.34 markus 615: void
616: fatal(const char *fmt,...)
1.26 markus 617: {
1.34 markus 618: va_list args;
1.39 deraadt 619:
1.34 markus 620: va_start(args, fmt);
621: do_log(SYSLOG_LEVEL_FATAL, fmt, args);
622: va_end(args);
1.95 markus 623: exit(255);
1.26 markus 624: }
625:
626: static void
1.1 markus 627: usage(void)
628: {
1.77 sobrado 629: fprintf(stderr,
1.117 djm 630: "usage: %s [-46cDHv] [-f file] [-p port] [-T timeout] [-t type]\n"
1.119 jmc 631: "\t\t [host | addrlist namelist]\n",
1.25 jakob 632: __progname);
633: exit(1);
1.1 markus 634: }
635:
636: int
637: main(int argc, char **argv)
638: {
1.26 markus 639: int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
1.82 djm 640: int opt, fopt_count = 0, j;
1.120 markus 641: char *tname, *cp, *line = NULL;
642: size_t linesize = 0;
1.82 djm 643: FILE *fp;
1.26 markus 644:
645: extern int optind;
646: extern char *optarg;
1.1 markus 647:
648: TAILQ_INIT(&tq);
1.56 djm 649:
650: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
651: sanitise_stdfd();
1.1 markus 652:
1.26 markus 653: if (argc <= 1)
1.1 markus 654: usage();
655:
1.117 djm 656: while ((opt = getopt(argc, argv, "cDHv46p:T:t:f:")) != -1) {
1.26 markus 657: switch (opt) {
1.51 djm 658: case 'H':
659: hash_hosts = 1;
1.103 djm 660: break;
661: case 'c':
662: get_cert = 1;
1.117 djm 663: break;
664: case 'D':
665: print_sshfp = 1;
1.51 djm 666: break;
1.26 markus 667: case 'p':
668: ssh_port = a2port(optarg);
1.78 djm 669: if (ssh_port <= 0) {
1.26 markus 670: fprintf(stderr, "Bad port '%s'\n", optarg);
671: exit(1);
672: }
673: break;
674: case 'T':
1.38 stevesk 675: timeout = convtime(optarg);
676: if (timeout == -1 || timeout == 0) {
677: fprintf(stderr, "Bad timeout '%s'\n", optarg);
1.1 markus 678: usage();
1.38 stevesk 679: }
1.26 markus 680: break;
681: case 'v':
682: if (!debug_flag) {
683: debug_flag = 1;
684: log_level = SYSLOG_LEVEL_DEBUG1;
685: }
686: else if (log_level < SYSLOG_LEVEL_DEBUG3)
687: log_level++;
688: else
689: fatal("Too high debugging level.");
690: break;
691: case 'f':
692: if (strcmp(optarg, "-") == 0)
693: optarg = NULL;
694: argv[fopt_count++] = optarg;
695: break;
696: case 't':
697: get_keytypes = 0;
698: tname = strtok(optarg, ",");
699: while (tname) {
1.95 markus 700: int type = sshkey_type_from_name(tname);
1.107 djm 701:
1.26 markus 702: switch (type) {
703: case KEY_DSA:
704: get_keytypes |= KT_DSA;
1.83 djm 705: break;
706: case KEY_ECDSA:
707: get_keytypes |= KT_ECDSA;
1.26 markus 708: break;
709: case KEY_RSA:
710: get_keytypes |= KT_RSA;
1.89 markus 711: break;
712: case KEY_ED25519:
713: get_keytypes |= KT_ED25519;
1.118 markus 714: break;
715: case KEY_XMSS:
716: get_keytypes |= KT_XMSS;
1.26 markus 717: break;
718: case KEY_UNSPEC:
1.107 djm 719: default:
720: fatal("Unknown key type \"%s\"", tname);
1.26 markus 721: }
722: tname = strtok(NULL, ",");
723: }
724: break;
725: case '4':
726: IPv4or6 = AF_INET;
727: break;
728: case '6':
729: IPv4or6 = AF_INET6;
730: break;
731: case '?':
732: default:
733: usage();
1.1 markus 734: }
735: }
1.26 markus 736: if (optind == argc && !fopt_count)
1.1 markus 737: usage();
738:
1.26 markus 739: log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
740:
1.1 markus 741: maxfd = fdlim_get(1);
742: if (maxfd < 0)
1.4 markus 743: fatal("%s: fdlim_get: bad value", __progname);
1.1 markus 744: if (maxfd > MAXMAXFD)
745: maxfd = MAXMAXFD;
1.18 deraadt 746: if (MAXCON <= 0)
1.4 markus 747: fatal("%s: not enough file descriptors", __progname);
1.1 markus 748: if (maxfd > fdlim_get(0))
749: fdlim_set(maxfd);
1.63 djm 750: fdcon = xcalloc(maxfd, sizeof(con));
1.19 millert 751:
1.63 djm 752: read_wait_nfdset = howmany(maxfd, NFDBITS);
753: read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));
1.1 markus 754:
1.82 djm 755: for (j = 0; j < fopt_count; j++) {
756: if (argv[j] == NULL)
757: fp = stdin;
758: else if ((fp = fopen(argv[j], "r")) == NULL)
759: fatal("%s: %s: %s", __progname, argv[j],
760: strerror(errno));
761:
1.120 markus 762: while (getline(&line, &linesize, fp) != -1) {
1.82 djm 763: /* Chomp off trailing whitespace and comments */
764: if ((cp = strchr(line, '#')) == NULL)
765: cp = line + strlen(line) - 1;
766: while (cp >= line) {
767: if (*cp == ' ' || *cp == '\t' ||
768: *cp == '\n' || *cp == '#')
769: *cp-- = '\0';
770: else
771: break;
772: }
773:
774: /* Skip empty lines */
775: if (*line == '\0')
1.28 danh 776: continue;
1.82 djm 777:
778: do_host(line);
1.26 markus 779: }
1.82 djm 780:
781: if (ferror(fp))
782: fatal("%s: %s: %s", __progname, argv[j],
783: strerror(errno));
784:
785: fclose(fp);
1.26 markus 786: }
1.120 markus 787: free(line);
1.26 markus 788:
789: while (optind < argc)
790: do_host(argv[optind++]);
1.1 markus 791:
792: while (ncon > 0)
793: conloop();
794:
1.126 djm 795: return found_one ? 0 : 1;
1.1 markus 796: }
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