Annotation of src/usr.bin/ssh/ssh-keyscan.c, Revision 1.103
1.103 ! djm 1: /* $OpenBSD: ssh-keyscan.c,v 1.102 2015/10/24 22:56:19 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:
1.92 markus 172: #ifdef WITH_SSH1
1.95 markus 173: static struct sshkey *
1.26 markus 174: keygrab_ssh1(con *c)
1.1 markus 175: {
1.95 markus 176: static struct sshkey *rsa;
177: static struct sshbuf *msg;
178: int r;
179: u_char type;
1.1 markus 180:
181: if (rsa == NULL) {
1.95 markus 182: if ((rsa = sshkey_new(KEY_RSA1)) == NULL) {
183: error("%s: sshkey_new failed", __func__);
184: return NULL;
185: }
186: if ((msg = sshbuf_new()) == NULL)
187: fatal("%s: sshbuf_new failed", __func__);
1.1 markus 188: }
1.95 markus 189: if ((r = sshbuf_put(msg, c->c_data, c->c_plen)) != 0 ||
190: (r = sshbuf_consume(msg, 8 - (c->c_plen & 7))) != 0 || /* padding */
191: (r = sshbuf_get_u8(msg, &type)) != 0)
192: goto buf_err;
193: if (type != (int) SSH_SMSG_PUBLIC_KEY) {
1.26 markus 194: error("%s: invalid packet type", c->c_name);
1.95 markus 195: sshbuf_reset(msg);
196: return NULL;
197: }
198: if ((r = sshbuf_consume(msg, 8)) != 0 || /* cookie */
199: /* server key */
200: (r = sshbuf_get_u32(msg, NULL)) != 0 ||
201: (r = sshbuf_get_bignum1(msg, NULL)) != 0 ||
202: (r = sshbuf_get_bignum1(msg, NULL)) != 0 ||
203: /* host key */
204: (r = sshbuf_get_u32(msg, NULL)) != 0 ||
205: (r = sshbuf_get_bignum1(msg, rsa->rsa->e)) != 0 ||
206: (r = sshbuf_get_bignum1(msg, rsa->rsa->n)) != 0) {
207: buf_err:
208: error("%s: buffer error: %s", __func__, ssh_err(r));
209: sshbuf_reset(msg);
1.26 markus 210: return NULL;
1.1 markus 211: }
212:
1.95 markus 213: sshbuf_reset(msg);
1.1 markus 214:
1.26 markus 215: return (rsa);
216: }
1.92 markus 217: #endif
1.26 markus 218:
219: static int
1.95 markus 220: key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh)
1.26 markus 221: {
1.95 markus 222: con *c;
223:
224: if ((c = ssh_get_app_data(ssh)) != NULL)
225: keyprint(c, hostkey);
226: /* always abort key exchange */
227: return -1;
1.26 markus 228: }
229:
230: static int
231: ssh2_capable(int remote_major, int remote_minor)
232: {
233: switch (remote_major) {
234: case 1:
235: if (remote_minor == 99)
236: return 1;
237: break;
238: case 2:
239: return 1;
240: default:
241: break;
242: }
243: return 0;
244: }
245:
1.95 markus 246: static void
1.26 markus 247: keygrab_ssh2(con *c)
248: {
1.91 markus 249: char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
1.95 markus 250: int r;
1.26 markus 251:
252: enable_compat20();
1.103 ! djm 253: switch (c->c_keytype) {
! 254: case KT_DSA:
! 255: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
! 256: "ssh-dss-cert-v01@openssh.com" : "ssh-dss";
! 257: break;
! 258: case KT_RSA:
! 259: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
! 260: "ssh-rsa-cert-v01@openssh.com" : "ssh-rsa";
! 261: break;
! 262: case KT_ED25519:
! 263: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
! 264: "ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519";
! 265: break;
! 266: case KT_ECDSA:
! 267: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
! 268: "ecdsa-sha2-nistp256-cert-v01@openssh.com,"
! 269: "ecdsa-sha2-nistp384-cert-v01@openssh.com,"
! 270: "ecdsa-sha2-nistp521-cert-v01@openssh.com" :
! 271: "ecdsa-sha2-nistp256,"
! 272: "ecdsa-sha2-nistp384,"
! 273: "ecdsa-sha2-nistp521";
! 274: break;
! 275: default:
! 276: fatal("unknown key type %d", c->c_keytype);
! 277: break;
! 278: }
1.95 markus 279: if ((r = kex_setup(c->c_ssh, myproposal)) != 0) {
280: free(c->c_ssh);
281: fprintf(stderr, "kex_setup: %s\n", ssh_err(r));
282: exit(1);
283: }
1.92 markus 284: #ifdef WITH_OPENSSL
1.95 markus 285: c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
286: c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
287: c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
288: c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
289: c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kexecdh_client;
1.92 markus 290: #endif
1.95 markus 291: c->c_ssh->kex->kex[KEX_C25519_SHA256] = kexc25519_client;
292: ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper);
293: /*
294: * do the key-exchange until an error occurs or until
295: * the key_print_wrapper() callback sets c_done.
296: */
297: ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done, c->c_ssh);
1.26 markus 298: }
299:
300: static void
1.102 djm 301: keyprint_one(char *host, struct sshkey *key)
1.26 markus 302: {
1.102 djm 303: char *hostport;
1.51 djm 304:
305: if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL)
306: fatal("host_hash failed");
1.26 markus 307:
1.101 djm 308: hostport = put_host_port(host, ssh_port);
1.103 ! djm 309: if (!get_cert)
! 310: fprintf(stdout, "%s ", hostport);
1.95 markus 311: sshkey_write(key, stdout);
1.1 markus 312: fputs("\n", stdout);
1.101 djm 313: free(hostport);
1.102 djm 314: }
315:
316: static void
317: keyprint(con *c, struct sshkey *key)
318: {
319: char *hosts = c->c_output_name ? c->c_output_name : c->c_name;
320: char *host, *ohosts;
321:
322: if (key == NULL)
323: return;
1.103 ! djm 324: if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) {
1.102 djm 325: keyprint_one(hosts, key);
326: return;
327: }
328: ohosts = hosts = xstrdup(hosts);
329: while ((host = strsep(&hosts, ",")) != NULL)
330: keyprint_one(host, key);
331: free(ohosts);
1.1 markus 332: }
333:
1.24 itojun 334: static int
1.1 markus 335: tcpconnect(char *host)
336: {
337: struct addrinfo hints, *ai, *aitop;
338: char strport[NI_MAXSERV];
339: int gaierr, s = -1;
340:
1.26 markus 341: snprintf(strport, sizeof strport, "%d", ssh_port);
1.1 markus 342: memset(&hints, 0, sizeof(hints));
1.26 markus 343: hints.ai_family = IPv4or6;
1.1 markus 344: hints.ai_socktype = SOCK_STREAM;
1.97 djm 345: if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
346: error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
347: return -1;
348: }
1.1 markus 349: for (ai = aitop; ai; ai = ai->ai_next) {
1.81 dtucker 350: s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.1 markus 351: if (s < 0) {
352: error("socket: %s", strerror(errno));
353: continue;
354: }
1.49 djm 355: if (set_nonblock(s) == -1)
356: fatal("%s: set_nonblock(%d)", __func__, s);
1.1 markus 357: if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
358: errno != EINPROGRESS)
359: error("connect (`%s'): %s", host, strerror(errno));
360: else
361: break;
362: close(s);
363: s = -1;
364: }
365: freeaddrinfo(aitop);
366: return s;
367: }
368:
1.24 itojun 369: static int
1.26 markus 370: conalloc(char *iname, char *oname, int keytype)
1.1 markus 371: {
1.39 deraadt 372: char *namebase, *name, *namelist;
1.1 markus 373: int s;
374:
375: namebase = namelist = xstrdup(iname);
376:
377: do {
378: name = xstrsep(&namelist, ",");
379: if (!name) {
1.87 djm 380: free(namebase);
1.1 markus 381: return (-1);
382: }
383: } while ((s = tcpconnect(name)) < 0);
384:
385: if (s >= maxfd)
1.4 markus 386: fatal("conalloc: fdno %d too high", s);
1.1 markus 387: if (fdcon[s].c_status)
1.4 markus 388: fatal("conalloc: attempt to reuse fdno %d", s);
1.1 markus 389:
1.103 ! djm 390: debug3("%s: oname %s kt %d", __func__, oname, keytype);
1.1 markus 391: fdcon[s].c_fd = s;
392: fdcon[s].c_status = CS_CON;
393: fdcon[s].c_namebase = namebase;
394: fdcon[s].c_name = name;
395: fdcon[s].c_namelist = namelist;
396: fdcon[s].c_output_name = xstrdup(oname);
397: fdcon[s].c_data = (char *) &fdcon[s].c_plen;
398: fdcon[s].c_len = 4;
399: fdcon[s].c_off = 0;
1.26 markus 400: fdcon[s].c_keytype = keytype;
1.1 markus 401: gettimeofday(&fdcon[s].c_tv, NULL);
402: fdcon[s].c_tv.tv_sec += timeout;
403: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
1.19 millert 404: FD_SET(s, read_wait);
1.1 markus 405: ncon++;
406: return (s);
407: }
408:
1.24 itojun 409: static void
1.1 markus 410: confree(int s)
411: {
412: if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
1.4 markus 413: fatal("confree: attempt to free bad fdno %d", s);
1.18 deraadt 414: close(s);
1.87 djm 415: free(fdcon[s].c_namebase);
416: free(fdcon[s].c_output_name);
1.1 markus 417: if (fdcon[s].c_status == CS_KEYS)
1.87 djm 418: free(fdcon[s].c_data);
1.1 markus 419: fdcon[s].c_status = CS_UNUSED;
1.26 markus 420: fdcon[s].c_keytype = 0;
1.95 markus 421: if (fdcon[s].c_ssh) {
422: ssh_packet_close(fdcon[s].c_ssh);
423: free(fdcon[s].c_ssh);
424: fdcon[s].c_ssh = NULL;
425: }
1.1 markus 426: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
1.19 millert 427: FD_CLR(s, read_wait);
1.1 markus 428: ncon--;
429: }
430:
1.24 itojun 431: static void
1.1 markus 432: contouch(int s)
433: {
434: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
435: gettimeofday(&fdcon[s].c_tv, NULL);
436: fdcon[s].c_tv.tv_sec += timeout;
437: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
438: }
439:
1.24 itojun 440: static int
1.1 markus 441: conrecycle(int s)
442: {
1.39 deraadt 443: con *c = &fdcon[s];
1.1 markus 444: int ret;
445:
1.26 markus 446: ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
1.1 markus 447: confree(s);
448: return (ret);
449: }
450:
1.24 itojun 451: static void
1.1 markus 452: congreet(int s)
453: {
1.55 djm 454: int n = 0, remote_major = 0, remote_minor = 0;
1.26 markus 455: char buf[256], *cp;
1.33 markus 456: char remote_version[sizeof buf];
1.55 djm 457: size_t bufsiz;
1.1 markus 458: con *c = &fdcon[s];
459:
1.57 djm 460: for (;;) {
461: memset(buf, '\0', sizeof(buf));
462: bufsiz = sizeof(buf);
463: cp = buf;
464: while (bufsiz-- &&
465: (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
466: if (*cp == '\r')
467: *cp = '\n';
468: cp++;
469: }
470: if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
471: break;
1.27 markus 472: }
1.54 avsm 473: if (n == 0) {
474: switch (errno) {
475: case EPIPE:
476: error("%s: Connection closed by remote host", c->c_name);
477: break;
478: case ECONNREFUSED:
479: break;
480: default:
1.1 markus 481: error("read (%s): %s", c->c_name, strerror(errno));
1.54 avsm 482: break;
483: }
1.1 markus 484: conrecycle(s);
485: return;
486: }
1.21 millert 487: if (*cp != '\n' && *cp != '\r') {
1.1 markus 488: error("%s: bad greeting", c->c_name);
489: confree(s);
490: return;
491: }
1.21 millert 492: *cp = '\0';
1.98 djm 493: if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL)
494: fatal("ssh_packet_set_connection failed");
1.99 djm 495: ssh_packet_set_timeout(c->c_ssh, timeout, 1);
1.95 markus 496: ssh_set_app_data(c->c_ssh, c); /* back link */
1.33 markus 497: if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
498: &remote_major, &remote_minor, remote_version) == 3)
1.95 markus 499: c->c_ssh->compat = compat_datafellows(remote_version);
1.33 markus 500: else
1.95 markus 501: c->c_ssh->compat = 0;
1.26 markus 502: if (c->c_keytype != KT_RSA1) {
503: if (!ssh2_capable(remote_major, remote_minor)) {
504: debug("%s doesn't support ssh2", c->c_name);
505: confree(s);
506: return;
507: }
1.33 markus 508: } else if (remote_major != 1) {
509: debug("%s doesn't support ssh1", c->c_name);
510: confree(s);
511: return;
1.26 markus 512: }
1.101 djm 513: fprintf(stderr, "# %s:%d %s\n", c->c_name, ssh_port, chop(buf));
1.26 markus 514: n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
515: c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
516: c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
1.55 djm 517: if (n < 0 || (size_t)n >= sizeof(buf)) {
1.53 moritz 518: error("snprintf: buffer too small");
519: confree(s);
520: return;
521: }
1.55 djm 522: if (atomicio(vwrite, s, buf, n) != (size_t)n) {
1.1 markus 523: error("write (%s): %s", c->c_name, strerror(errno));
524: confree(s);
525: return;
526: }
1.26 markus 527: if (c->c_keytype != KT_RSA1) {
1.95 markus 528: keygrab_ssh2(c);
1.26 markus 529: confree(s);
530: return;
531: }
1.1 markus 532: c->c_status = CS_SIZE;
533: contouch(s);
534: }
535:
1.24 itojun 536: static void
1.1 markus 537: conread(int s)
538: {
1.39 deraadt 539: con *c = &fdcon[s];
1.54 avsm 540: size_t n;
1.1 markus 541:
542: if (c->c_status == CS_CON) {
543: congreet(s);
544: return;
545: }
1.50 avsm 546: n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
1.54 avsm 547: if (n == 0) {
1.1 markus 548: error("read (%s): %s", c->c_name, strerror(errno));
549: confree(s);
550: return;
551: }
552: c->c_off += n;
553:
554: if (c->c_off == c->c_len)
555: switch (c->c_status) {
556: case CS_SIZE:
557: c->c_plen = htonl(c->c_plen);
558: c->c_len = c->c_plen + 8 - (c->c_plen & 7);
559: c->c_off = 0;
560: c->c_data = xmalloc(c->c_len);
561: c->c_status = CS_KEYS;
562: break;
1.92 markus 563: #ifdef WITH_SSH1
1.1 markus 564: case CS_KEYS:
1.26 markus 565: keyprint(c, keygrab_ssh1(c));
1.1 markus 566: confree(s);
567: return;
1.92 markus 568: #endif
1.1 markus 569: default:
1.4 markus 570: fatal("conread: invalid status %d", c->c_status);
1.1 markus 571: break;
572: }
573:
574: contouch(s);
575: }
576:
1.24 itojun 577: static void
1.1 markus 578: conloop(void)
579: {
1.39 deraadt 580: struct timeval seltime, now;
1.19 millert 581: fd_set *r, *e;
1.39 deraadt 582: con *c;
1.1 markus 583: int i;
584:
585: gettimeofday(&now, NULL);
1.36 itojun 586: c = TAILQ_FIRST(&tq);
1.1 markus 587:
1.18 deraadt 588: if (c && (c->c_tv.tv_sec > now.tv_sec ||
589: (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
1.1 markus 590: seltime = c->c_tv;
591: seltime.tv_sec -= now.tv_sec;
592: seltime.tv_usec -= now.tv_usec;
1.13 itojun 593: if (seltime.tv_usec < 0) {
1.1 markus 594: seltime.tv_usec += 1000000;
595: seltime.tv_sec--;
596: }
597: } else
1.85 okan 598: timerclear(&seltime);
1.1 markus 599:
1.63 djm 600: r = xcalloc(read_wait_nfdset, sizeof(fd_mask));
601: e = xcalloc(read_wait_nfdset, sizeof(fd_mask));
602: memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask));
603: memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask));
1.19 millert 604:
605: while (select(maxfd, r, NULL, e, &seltime) == -1 &&
1.16 deraadt 606: (errno == EAGAIN || errno == EINTR))
607: ;
608:
1.18 deraadt 609: for (i = 0; i < maxfd; i++) {
1.19 millert 610: if (FD_ISSET(i, e)) {
1.1 markus 611: error("%s: exception!", fdcon[i].c_name);
612: confree(i);
1.19 millert 613: } else if (FD_ISSET(i, r))
1.1 markus 614: conread(i);
1.18 deraadt 615: }
1.87 djm 616: free(r);
617: free(e);
1.1 markus 618:
1.36 itojun 619: c = TAILQ_FIRST(&tq);
1.18 deraadt 620: while (c && (c->c_tv.tv_sec < now.tv_sec ||
621: (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
1.1 markus 622: int s = c->c_fd;
1.18 deraadt 623:
1.36 itojun 624: c = TAILQ_NEXT(c, c_link);
1.1 markus 625: conrecycle(s);
626: }
627: }
628:
1.26 markus 629: static void
630: do_host(char *host)
1.1 markus 631: {
1.26 markus 632: char *name = strnnsep(&host, " \t\n");
633: int j;
1.1 markus 634:
1.31 markus 635: if (name == NULL)
636: return;
1.89 markus 637: for (j = KT_RSA1; j <= KT_ED25519; j *= 2) {
1.26 markus 638: if (get_keytypes & j) {
639: while (ncon >= MAXCON)
640: conloop();
641: conalloc(name, *host ? host : name, j);
1.1 markus 642: }
643: }
644: }
645:
1.34 markus 646: void
647: fatal(const char *fmt,...)
1.26 markus 648: {
1.34 markus 649: va_list args;
1.39 deraadt 650:
1.34 markus 651: va_start(args, fmt);
652: do_log(SYSLOG_LEVEL_FATAL, fmt, args);
653: va_end(args);
1.95 markus 654: exit(255);
1.26 markus 655: }
656:
657: static void
1.1 markus 658: usage(void)
659: {
1.77 sobrado 660: fprintf(stderr,
1.103 ! djm 661: "usage: %s [-46Hcv] [-f file] [-p port] [-T timeout] [-t type]\n"
1.81 dtucker 662: "\t\t [host | addrlist namelist] ...\n",
1.25 jakob 663: __progname);
664: exit(1);
1.1 markus 665: }
666:
667: int
668: main(int argc, char **argv)
669: {
1.26 markus 670: int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
1.82 djm 671: int opt, fopt_count = 0, j;
672: char *tname, *cp, line[NI_MAXHOST];
673: FILE *fp;
674: u_long linenum;
1.26 markus 675:
676: extern int optind;
677: extern char *optarg;
1.1 markus 678:
679: TAILQ_INIT(&tq);
1.56 djm 680:
681: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
682: sanitise_stdfd();
1.1 markus 683:
1.26 markus 684: if (argc <= 1)
1.1 markus 685: usage();
686:
1.103 ! djm 687: while ((opt = getopt(argc, argv, "cHv46p:T:t:f:")) != -1) {
1.26 markus 688: switch (opt) {
1.51 djm 689: case 'H':
690: hash_hosts = 1;
1.103 ! djm 691: break;
! 692: case 'c':
! 693: get_cert = 1;
1.51 djm 694: break;
1.26 markus 695: case 'p':
696: ssh_port = a2port(optarg);
1.78 djm 697: if (ssh_port <= 0) {
1.26 markus 698: fprintf(stderr, "Bad port '%s'\n", optarg);
699: exit(1);
700: }
701: break;
702: case 'T':
1.38 stevesk 703: timeout = convtime(optarg);
704: if (timeout == -1 || timeout == 0) {
705: fprintf(stderr, "Bad timeout '%s'\n", optarg);
1.1 markus 706: usage();
1.38 stevesk 707: }
1.26 markus 708: break;
709: case 'v':
710: if (!debug_flag) {
711: debug_flag = 1;
712: log_level = SYSLOG_LEVEL_DEBUG1;
713: }
714: else if (log_level < SYSLOG_LEVEL_DEBUG3)
715: log_level++;
716: else
717: fatal("Too high debugging level.");
718: break;
719: case 'f':
720: if (strcmp(optarg, "-") == 0)
721: optarg = NULL;
722: argv[fopt_count++] = optarg;
723: break;
724: case 't':
725: get_keytypes = 0;
726: tname = strtok(optarg, ",");
727: while (tname) {
1.95 markus 728: int type = sshkey_type_from_name(tname);
1.26 markus 729: switch (type) {
730: case KEY_RSA1:
731: get_keytypes |= KT_RSA1;
732: break;
733: case KEY_DSA:
734: get_keytypes |= KT_DSA;
1.83 djm 735: break;
736: case KEY_ECDSA:
737: get_keytypes |= KT_ECDSA;
1.26 markus 738: break;
739: case KEY_RSA:
740: get_keytypes |= KT_RSA;
1.89 markus 741: break;
742: case KEY_ED25519:
743: get_keytypes |= KT_ED25519;
1.26 markus 744: break;
745: case KEY_UNSPEC:
1.32 stevesk 746: fatal("unknown key type %s", tname);
1.26 markus 747: }
748: tname = strtok(NULL, ",");
749: }
750: break;
751: case '4':
752: IPv4or6 = AF_INET;
753: break;
754: case '6':
755: IPv4or6 = AF_INET6;
756: break;
757: case '?':
758: default:
759: usage();
1.1 markus 760: }
761: }
1.26 markus 762: if (optind == argc && !fopt_count)
1.1 markus 763: usage();
764:
1.26 markus 765: log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
766:
1.1 markus 767: maxfd = fdlim_get(1);
768: if (maxfd < 0)
1.4 markus 769: fatal("%s: fdlim_get: bad value", __progname);
1.1 markus 770: if (maxfd > MAXMAXFD)
771: maxfd = MAXMAXFD;
1.18 deraadt 772: if (MAXCON <= 0)
1.4 markus 773: fatal("%s: not enough file descriptors", __progname);
1.1 markus 774: if (maxfd > fdlim_get(0))
775: fdlim_set(maxfd);
1.63 djm 776: fdcon = xcalloc(maxfd, sizeof(con));
1.19 millert 777:
1.63 djm 778: read_wait_nfdset = howmany(maxfd, NFDBITS);
779: read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));
1.1 markus 780:
1.82 djm 781: for (j = 0; j < fopt_count; j++) {
782: if (argv[j] == NULL)
783: fp = stdin;
784: else if ((fp = fopen(argv[j], "r")) == NULL)
785: fatal("%s: %s: %s", __progname, argv[j],
786: strerror(errno));
787: linenum = 0;
788:
789: while (read_keyfile_line(fp,
790: argv[j] == NULL ? "(stdin)" : argv[j], line, sizeof(line),
791: &linenum) != -1) {
792: /* Chomp off trailing whitespace and comments */
793: if ((cp = strchr(line, '#')) == NULL)
794: cp = line + strlen(line) - 1;
795: while (cp >= line) {
796: if (*cp == ' ' || *cp == '\t' ||
797: *cp == '\n' || *cp == '#')
798: *cp-- = '\0';
799: else
800: break;
801: }
802:
803: /* Skip empty lines */
804: if (*line == '\0')
1.28 danh 805: continue;
1.82 djm 806:
807: do_host(line);
1.26 markus 808: }
1.82 djm 809:
810: if (ferror(fp))
811: fatal("%s: %s: %s", __progname, argv[j],
812: strerror(errno));
813:
814: fclose(fp);
1.26 markus 815: }
816:
817: while (optind < argc)
818: do_host(argv[optind++]);
1.1 markus 819:
820: while (ncon > 0)
821: conloop();
822:
823: return (0);
824: }
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