Annotation of src/usr.bin/ssh/ssh-keyscan.c, Revision 1.128
1.128 ! deraadt 1: /* $OpenBSD: ssh-keyscan.c,v 1.127 2019/06/06 05:13:13 otto 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:
1.126 djm 67: int found_one = 0; /* Successfully found a key */
68:
1.1 markus 69: #define MAXMAXFD 256
70:
71: /* The number of seconds after which to give up on a TCP connection */
72: int timeout = 5;
73:
74: int maxfd;
1.18 deraadt 75: #define MAXCON (maxfd - 10)
1.1 markus 76:
1.3 markus 77: extern char *__progname;
1.19 millert 78: fd_set *read_wait;
1.63 djm 79: size_t read_wait_nfdset;
1.1 markus 80: int ncon;
81:
82: /*
83: * Keep a connection structure for each file descriptor. The state
84: * associated with file descriptor n is held in fdcon[n].
85: */
86: typedef struct Connection {
1.6 markus 87: u_char c_status; /* State of connection on this file desc. */
1.1 markus 88: #define CS_UNUSED 0 /* File descriptor unused */
89: #define CS_CON 1 /* Waiting to connect/read greeting */
90: #define CS_SIZE 2 /* Waiting to read initial packet size */
91: #define CS_KEYS 3 /* Waiting to read public key packet */
92: int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
93: int c_plen; /* Packet length field for ssh packet */
94: int c_len; /* Total bytes which must be read. */
95: int c_off; /* Length of data read so far. */
1.112 djm 96: int c_keytype; /* Only one of KT_* */
1.100 miod 97: sig_atomic_t c_done; /* SSH2 done */
1.1 markus 98: char *c_namebase; /* Address to free for c_name and c_namelist */
99: char *c_name; /* Hostname of connection for errors */
100: char *c_namelist; /* Pointer to other possible addresses */
101: char *c_output_name; /* Hostname of connection for output */
102: char *c_data; /* Data read from this fd */
1.95 markus 103: struct ssh *c_ssh; /* SSH-connection */
1.1 markus 104: struct timeval c_tv; /* Time at which connection gets aborted */
105: TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
106: } con;
107:
108: TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
109: con *fdcon;
110:
1.95 markus 111: static void keyprint(con *c, struct sshkey *key);
112:
1.24 itojun 113: static int
1.1 markus 114: fdlim_get(int hard)
115: {
116: struct rlimit rlfd;
1.17 deraadt 117:
1.128 ! deraadt 118: if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1)
1.1 markus 119: return (-1);
120: if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
1.46 djm 121: return sysconf(_SC_OPEN_MAX);
1.1 markus 122: else
123: return hard ? rlfd.rlim_max : rlfd.rlim_cur;
124: }
125:
1.24 itojun 126: static int
1.1 markus 127: fdlim_set(int lim)
128: {
129: struct rlimit rlfd;
1.39 deraadt 130:
1.1 markus 131: if (lim <= 0)
132: return (-1);
1.128 ! deraadt 133: if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1)
1.1 markus 134: return (-1);
135: rlfd.rlim_cur = lim;
1.128 ! deraadt 136: if (setrlimit(RLIMIT_NOFILE, &rlfd) == -1)
1.1 markus 137: return (-1);
138: return (0);
139: }
140:
141: /*
142: * This is an strsep function that returns a null field for adjacent
143: * separators. This is the same as the 4.4BSD strsep, but different from the
144: * one in the GNU libc.
145: */
1.24 itojun 146: static char *
1.1 markus 147: xstrsep(char **str, const char *delim)
148: {
149: char *s, *e;
150:
151: if (!**str)
152: return (NULL);
153:
154: s = *str;
155: e = s + strcspn(s, delim);
156:
157: if (*e != '\0')
158: *e++ = '\0';
159: *str = e;
160:
161: return (s);
162: }
163:
164: /*
165: * Get the next non-null token (like GNU strsep). Strsep() will return a
166: * null token for two adjacent separators, so we may have to loop.
167: */
1.24 itojun 168: static char *
1.1 markus 169: strnnsep(char **stringp, char *delim)
170: {
171: char *tok;
172:
173: do {
174: tok = xstrsep(stringp, delim);
175: } while (tok && *tok == '\0');
176: return (tok);
177: }
178:
1.26 markus 179:
180: static int
1.95 markus 181: key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh)
1.26 markus 182: {
1.95 markus 183: con *c;
184:
185: if ((c = ssh_get_app_data(ssh)) != NULL)
186: keyprint(c, hostkey);
187: /* always abort key exchange */
188: return -1;
1.26 markus 189: }
190:
191: static int
192: ssh2_capable(int remote_major, int remote_minor)
193: {
194: switch (remote_major) {
195: case 1:
196: if (remote_minor == 99)
197: return 1;
198: break;
199: case 2:
200: return 1;
201: default:
202: break;
203: }
204: return 0;
205: }
206:
1.95 markus 207: static void
1.26 markus 208: keygrab_ssh2(con *c)
209: {
1.91 markus 210: char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
1.95 markus 211: int r;
1.26 markus 212:
1.103 djm 213: switch (c->c_keytype) {
214: case KT_DSA:
215: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
216: "ssh-dss-cert-v01@openssh.com" : "ssh-dss";
217: break;
218: case KT_RSA:
219: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
220: "ssh-rsa-cert-v01@openssh.com" : "ssh-rsa";
221: break;
222: case KT_ED25519:
223: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
224: "ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519";
225: break;
1.118 markus 226: case KT_XMSS:
227: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
228: "ssh-xmss-cert-v01@openssh.com" : "ssh-xmss@openssh.com";
229: break;
1.103 djm 230: case KT_ECDSA:
231: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
232: "ecdsa-sha2-nistp256-cert-v01@openssh.com,"
233: "ecdsa-sha2-nistp384-cert-v01@openssh.com,"
234: "ecdsa-sha2-nistp521-cert-v01@openssh.com" :
235: "ecdsa-sha2-nistp256,"
236: "ecdsa-sha2-nistp384,"
237: "ecdsa-sha2-nistp521";
238: break;
239: default:
240: fatal("unknown key type %d", c->c_keytype);
241: break;
242: }
1.95 markus 243: if ((r = kex_setup(c->c_ssh, myproposal)) != 0) {
244: free(c->c_ssh);
245: fprintf(stderr, "kex_setup: %s\n", ssh_err(r));
246: exit(1);
247: }
1.92 markus 248: #ifdef WITH_OPENSSL
1.125 djm 249: c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_client;
250: c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_client;
251: c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_client;
252: c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_client;
253: c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_client;
1.95 markus 254: c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
255: c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
1.125 djm 256: c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kex_gen_client;
1.92 markus 257: #endif
1.125 djm 258: c->c_ssh->kex->kex[KEX_C25519_SHA256] = kex_gen_client;
259: c->c_ssh->kex->kex[KEX_KEM_SNTRUP4591761X25519_SHA512] = kex_gen_client;
1.95 markus 260: ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper);
261: /*
262: * do the key-exchange until an error occurs or until
263: * the key_print_wrapper() callback sets c_done.
264: */
1.114 markus 265: ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done);
1.26 markus 266: }
267:
268: static void
1.108 djm 269: keyprint_one(const char *host, struct sshkey *key)
1.26 markus 270: {
1.102 djm 271: char *hostport;
1.108 djm 272: const char *known_host, *hashed;
1.51 djm 273:
1.126 djm 274: found_one = 1;
275:
1.117 djm 276: if (print_sshfp) {
277: export_dns_rr(host, key, stdout, 0);
278: return;
279: }
280:
1.108 djm 281: hostport = put_host_port(host, ssh_port);
1.109 djm 282: lowercase(hostport);
1.108 djm 283: if (hash_hosts && (hashed = host_hash(host, NULL, 0)) == NULL)
1.51 djm 284: fatal("host_hash failed");
1.108 djm 285: known_host = hash_hosts ? hashed : hostport;
1.103 djm 286: if (!get_cert)
1.108 djm 287: fprintf(stdout, "%s ", known_host);
1.95 markus 288: sshkey_write(key, stdout);
1.1 markus 289: fputs("\n", stdout);
1.101 djm 290: free(hostport);
1.102 djm 291: }
292:
293: static void
294: keyprint(con *c, struct sshkey *key)
295: {
296: char *hosts = c->c_output_name ? c->c_output_name : c->c_name;
297: char *host, *ohosts;
298:
299: if (key == NULL)
300: return;
1.103 djm 301: if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) {
1.102 djm 302: keyprint_one(hosts, key);
303: return;
304: }
305: ohosts = hosts = xstrdup(hosts);
306: while ((host = strsep(&hosts, ",")) != NULL)
307: keyprint_one(host, key);
308: free(ohosts);
1.1 markus 309: }
310:
1.24 itojun 311: static int
1.1 markus 312: tcpconnect(char *host)
313: {
314: struct addrinfo hints, *ai, *aitop;
315: char strport[NI_MAXSERV];
316: int gaierr, s = -1;
317:
1.26 markus 318: snprintf(strport, sizeof strport, "%d", ssh_port);
1.1 markus 319: memset(&hints, 0, sizeof(hints));
1.26 markus 320: hints.ai_family = IPv4or6;
1.1 markus 321: hints.ai_socktype = SOCK_STREAM;
1.97 djm 322: if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
323: error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
324: return -1;
325: }
1.1 markus 326: for (ai = aitop; ai; ai = ai->ai_next) {
1.81 dtucker 327: s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.128 ! deraadt 328: if (s == -1) {
1.1 markus 329: error("socket: %s", strerror(errno));
330: continue;
331: }
1.49 djm 332: if (set_nonblock(s) == -1)
333: fatal("%s: set_nonblock(%d)", __func__, s);
1.128 ! deraadt 334: if (connect(s, ai->ai_addr, ai->ai_addrlen) == -1 &&
1.1 markus 335: errno != EINPROGRESS)
336: error("connect (`%s'): %s", host, strerror(errno));
337: else
338: break;
339: close(s);
340: s = -1;
341: }
342: freeaddrinfo(aitop);
343: return s;
344: }
345:
1.24 itojun 346: static int
1.26 markus 347: conalloc(char *iname, char *oname, int keytype)
1.1 markus 348: {
1.39 deraadt 349: char *namebase, *name, *namelist;
1.1 markus 350: int s;
351:
352: namebase = namelist = xstrdup(iname);
353:
354: do {
355: name = xstrsep(&namelist, ",");
356: if (!name) {
1.87 djm 357: free(namebase);
1.1 markus 358: return (-1);
359: }
360: } while ((s = tcpconnect(name)) < 0);
361:
362: if (s >= maxfd)
1.4 markus 363: fatal("conalloc: fdno %d too high", s);
1.1 markus 364: if (fdcon[s].c_status)
1.4 markus 365: fatal("conalloc: attempt to reuse fdno %d", s);
1.1 markus 366:
1.103 djm 367: debug3("%s: oname %s kt %d", __func__, oname, keytype);
1.1 markus 368: fdcon[s].c_fd = s;
369: fdcon[s].c_status = CS_CON;
370: fdcon[s].c_namebase = namebase;
371: fdcon[s].c_name = name;
372: fdcon[s].c_namelist = namelist;
373: fdcon[s].c_output_name = xstrdup(oname);
374: fdcon[s].c_data = (char *) &fdcon[s].c_plen;
375: fdcon[s].c_len = 4;
376: fdcon[s].c_off = 0;
1.26 markus 377: fdcon[s].c_keytype = keytype;
1.116 dtucker 378: monotime_tv(&fdcon[s].c_tv);
1.1 markus 379: fdcon[s].c_tv.tv_sec += timeout;
380: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
1.19 millert 381: FD_SET(s, read_wait);
1.1 markus 382: ncon++;
383: return (s);
384: }
385:
1.24 itojun 386: static void
1.1 markus 387: confree(int s)
388: {
389: if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
1.4 markus 390: fatal("confree: attempt to free bad fdno %d", s);
1.87 djm 391: free(fdcon[s].c_namebase);
392: free(fdcon[s].c_output_name);
1.1 markus 393: if (fdcon[s].c_status == CS_KEYS)
1.87 djm 394: free(fdcon[s].c_data);
1.1 markus 395: fdcon[s].c_status = CS_UNUSED;
1.26 markus 396: fdcon[s].c_keytype = 0;
1.95 markus 397: if (fdcon[s].c_ssh) {
398: ssh_packet_close(fdcon[s].c_ssh);
399: free(fdcon[s].c_ssh);
400: fdcon[s].c_ssh = NULL;
1.115 dtucker 401: } else
402: close(s);
1.1 markus 403: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
1.19 millert 404: FD_CLR(s, read_wait);
1.1 markus 405: ncon--;
406: }
407:
1.24 itojun 408: static void
1.1 markus 409: contouch(int s)
410: {
411: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
1.116 dtucker 412: monotime_tv(&fdcon[s].c_tv);
1.1 markus 413: fdcon[s].c_tv.tv_sec += timeout;
414: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
415: }
416:
1.24 itojun 417: static int
1.1 markus 418: conrecycle(int s)
419: {
1.39 deraadt 420: con *c = &fdcon[s];
1.1 markus 421: int ret;
422:
1.26 markus 423: ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
1.1 markus 424: confree(s);
425: return (ret);
426: }
427:
1.24 itojun 428: static void
1.1 markus 429: congreet(int s)
430: {
1.55 djm 431: int n = 0, remote_major = 0, remote_minor = 0;
1.26 markus 432: char buf[256], *cp;
1.33 markus 433: char remote_version[sizeof buf];
1.55 djm 434: size_t bufsiz;
1.1 markus 435: con *c = &fdcon[s];
436:
1.112 djm 437: /* send client banner */
438: n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
439: PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2);
440: if (n < 0 || (size_t)n >= sizeof(buf)) {
441: error("snprintf: buffer too small");
442: confree(s);
443: return;
444: }
445: if (atomicio(vwrite, s, buf, n) != (size_t)n) {
446: error("write (%s): %s", c->c_name, strerror(errno));
447: confree(s);
448: return;
449: }
450:
1.57 djm 451: for (;;) {
452: memset(buf, '\0', sizeof(buf));
453: bufsiz = sizeof(buf);
454: cp = buf;
455: while (bufsiz-- &&
456: (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
457: if (*cp == '\r')
458: *cp = '\n';
459: cp++;
460: }
461: if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
462: break;
1.27 markus 463: }
1.54 avsm 464: if (n == 0) {
465: switch (errno) {
466: case EPIPE:
467: error("%s: Connection closed by remote host", c->c_name);
468: break;
469: case ECONNREFUSED:
470: break;
471: default:
1.1 markus 472: error("read (%s): %s", c->c_name, strerror(errno));
1.54 avsm 473: break;
474: }
1.1 markus 475: conrecycle(s);
476: return;
477: }
1.21 millert 478: if (*cp != '\n' && *cp != '\r') {
1.1 markus 479: error("%s: bad greeting", c->c_name);
480: confree(s);
481: return;
482: }
1.21 millert 483: *cp = '\0';
1.98 djm 484: if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL)
485: fatal("ssh_packet_set_connection failed");
1.99 djm 486: ssh_packet_set_timeout(c->c_ssh, timeout, 1);
1.95 markus 487: ssh_set_app_data(c->c_ssh, c); /* back link */
1.33 markus 488: if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
489: &remote_major, &remote_minor, remote_version) == 3)
1.95 markus 490: c->c_ssh->compat = compat_datafellows(remote_version);
1.33 markus 491: else
1.95 markus 492: c->c_ssh->compat = 0;
1.112 djm 493: if (!ssh2_capable(remote_major, remote_minor)) {
494: debug("%s doesn't support ssh2", c->c_name);
1.33 markus 495: confree(s);
496: return;
1.26 markus 497: }
1.117 djm 498: fprintf(stderr, "%c %s:%d %s\n", print_sshfp ? ';' : '#',
499: c->c_name, ssh_port, chop(buf));
1.112 djm 500: keygrab_ssh2(c);
501: confree(s);
1.1 markus 502: }
503:
1.24 itojun 504: static void
1.1 markus 505: conread(int s)
506: {
1.39 deraadt 507: con *c = &fdcon[s];
1.54 avsm 508: size_t n;
1.1 markus 509:
510: if (c->c_status == CS_CON) {
511: congreet(s);
512: return;
513: }
1.50 avsm 514: n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
1.54 avsm 515: if (n == 0) {
1.1 markus 516: error("read (%s): %s", c->c_name, strerror(errno));
517: confree(s);
518: return;
519: }
520: c->c_off += n;
521:
522: if (c->c_off == c->c_len)
523: switch (c->c_status) {
524: case CS_SIZE:
525: c->c_plen = htonl(c->c_plen);
526: c->c_len = c->c_plen + 8 - (c->c_plen & 7);
527: c->c_off = 0;
528: c->c_data = xmalloc(c->c_len);
529: c->c_status = CS_KEYS;
530: break;
531: default:
1.4 markus 532: fatal("conread: invalid status %d", c->c_status);
1.1 markus 533: break;
534: }
535:
536: contouch(s);
537: }
538:
1.24 itojun 539: static void
1.1 markus 540: conloop(void)
541: {
1.39 deraadt 542: struct timeval seltime, now;
1.19 millert 543: fd_set *r, *e;
1.39 deraadt 544: con *c;
1.1 markus 545: int i;
546:
1.116 dtucker 547: monotime_tv(&now);
1.36 itojun 548: c = TAILQ_FIRST(&tq);
1.1 markus 549:
1.18 deraadt 550: if (c && (c->c_tv.tv_sec > now.tv_sec ||
551: (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
1.1 markus 552: seltime = c->c_tv;
553: seltime.tv_sec -= now.tv_sec;
554: seltime.tv_usec -= now.tv_usec;
1.13 itojun 555: if (seltime.tv_usec < 0) {
1.1 markus 556: seltime.tv_usec += 1000000;
557: seltime.tv_sec--;
558: }
559: } else
1.85 okan 560: timerclear(&seltime);
1.1 markus 561:
1.63 djm 562: r = xcalloc(read_wait_nfdset, sizeof(fd_mask));
563: e = xcalloc(read_wait_nfdset, sizeof(fd_mask));
564: memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask));
565: memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask));
1.19 millert 566:
567: while (select(maxfd, r, NULL, e, &seltime) == -1 &&
1.16 deraadt 568: (errno == EAGAIN || errno == EINTR))
569: ;
570:
1.18 deraadt 571: for (i = 0; i < maxfd; i++) {
1.19 millert 572: if (FD_ISSET(i, e)) {
1.1 markus 573: error("%s: exception!", fdcon[i].c_name);
574: confree(i);
1.19 millert 575: } else if (FD_ISSET(i, r))
1.1 markus 576: conread(i);
1.18 deraadt 577: }
1.87 djm 578: free(r);
579: free(e);
1.1 markus 580:
1.36 itojun 581: c = TAILQ_FIRST(&tq);
1.18 deraadt 582: while (c && (c->c_tv.tv_sec < now.tv_sec ||
583: (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
1.1 markus 584: int s = c->c_fd;
1.18 deraadt 585:
1.36 itojun 586: c = TAILQ_NEXT(c, c_link);
1.1 markus 587: conrecycle(s);
588: }
589: }
590:
1.26 markus 591: static void
592: do_host(char *host)
1.1 markus 593: {
1.26 markus 594: char *name = strnnsep(&host, " \t\n");
595: int j;
1.1 markus 596:
1.31 markus 597: if (name == NULL)
598: return;
1.112 djm 599: for (j = KT_MIN; j <= KT_MAX; j *= 2) {
1.26 markus 600: if (get_keytypes & j) {
601: while (ncon >= MAXCON)
602: conloop();
603: conalloc(name, *host ? host : name, j);
1.1 markus 604: }
605: }
606: }
607:
1.34 markus 608: void
609: fatal(const char *fmt,...)
1.26 markus 610: {
1.34 markus 611: va_list args;
1.39 deraadt 612:
1.34 markus 613: va_start(args, fmt);
614: do_log(SYSLOG_LEVEL_FATAL, fmt, args);
615: va_end(args);
1.95 markus 616: exit(255);
1.26 markus 617: }
618:
619: static void
1.1 markus 620: usage(void)
621: {
1.77 sobrado 622: fprintf(stderr,
1.117 djm 623: "usage: %s [-46cDHv] [-f file] [-p port] [-T timeout] [-t type]\n"
1.119 jmc 624: "\t\t [host | addrlist namelist]\n",
1.25 jakob 625: __progname);
626: exit(1);
1.1 markus 627: }
628:
629: int
630: main(int argc, char **argv)
631: {
1.26 markus 632: int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
1.82 djm 633: int opt, fopt_count = 0, j;
1.120 markus 634: char *tname, *cp, *line = NULL;
635: size_t linesize = 0;
1.82 djm 636: FILE *fp;
1.26 markus 637:
638: extern int optind;
639: extern char *optarg;
1.1 markus 640:
641: TAILQ_INIT(&tq);
1.56 djm 642:
643: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
644: sanitise_stdfd();
1.1 markus 645:
1.26 markus 646: if (argc <= 1)
1.1 markus 647: usage();
648:
1.117 djm 649: while ((opt = getopt(argc, argv, "cDHv46p:T:t:f:")) != -1) {
1.26 markus 650: switch (opt) {
1.51 djm 651: case 'H':
652: hash_hosts = 1;
1.103 djm 653: break;
654: case 'c':
655: get_cert = 1;
1.117 djm 656: break;
657: case 'D':
658: print_sshfp = 1;
1.51 djm 659: break;
1.26 markus 660: case 'p':
661: ssh_port = a2port(optarg);
1.78 djm 662: if (ssh_port <= 0) {
1.26 markus 663: fprintf(stderr, "Bad port '%s'\n", optarg);
664: exit(1);
665: }
666: break;
667: case 'T':
1.38 stevesk 668: timeout = convtime(optarg);
669: if (timeout == -1 || timeout == 0) {
670: fprintf(stderr, "Bad timeout '%s'\n", optarg);
1.1 markus 671: usage();
1.38 stevesk 672: }
1.26 markus 673: break;
674: case 'v':
675: if (!debug_flag) {
676: debug_flag = 1;
677: log_level = SYSLOG_LEVEL_DEBUG1;
678: }
679: else if (log_level < SYSLOG_LEVEL_DEBUG3)
680: log_level++;
681: else
682: fatal("Too high debugging level.");
683: break;
684: case 'f':
685: if (strcmp(optarg, "-") == 0)
686: optarg = NULL;
687: argv[fopt_count++] = optarg;
688: break;
689: case 't':
690: get_keytypes = 0;
691: tname = strtok(optarg, ",");
692: while (tname) {
1.95 markus 693: int type = sshkey_type_from_name(tname);
1.107 djm 694:
1.26 markus 695: switch (type) {
696: case KEY_DSA:
697: get_keytypes |= KT_DSA;
1.83 djm 698: break;
699: case KEY_ECDSA:
700: get_keytypes |= KT_ECDSA;
1.26 markus 701: break;
702: case KEY_RSA:
703: get_keytypes |= KT_RSA;
1.89 markus 704: break;
705: case KEY_ED25519:
706: get_keytypes |= KT_ED25519;
1.118 markus 707: break;
708: case KEY_XMSS:
709: get_keytypes |= KT_XMSS;
1.26 markus 710: break;
711: case KEY_UNSPEC:
1.107 djm 712: default:
713: fatal("Unknown key type \"%s\"", tname);
1.26 markus 714: }
715: tname = strtok(NULL, ",");
716: }
717: break;
718: case '4':
719: IPv4or6 = AF_INET;
720: break;
721: case '6':
722: IPv4or6 = AF_INET6;
723: break;
724: case '?':
725: default:
726: usage();
1.1 markus 727: }
728: }
1.26 markus 729: if (optind == argc && !fopt_count)
1.1 markus 730: usage();
731:
1.26 markus 732: log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
733:
1.1 markus 734: maxfd = fdlim_get(1);
735: if (maxfd < 0)
1.4 markus 736: fatal("%s: fdlim_get: bad value", __progname);
1.1 markus 737: if (maxfd > MAXMAXFD)
738: maxfd = MAXMAXFD;
1.18 deraadt 739: if (MAXCON <= 0)
1.4 markus 740: fatal("%s: not enough file descriptors", __progname);
1.1 markus 741: if (maxfd > fdlim_get(0))
742: fdlim_set(maxfd);
1.63 djm 743: fdcon = xcalloc(maxfd, sizeof(con));
1.19 millert 744:
1.63 djm 745: read_wait_nfdset = howmany(maxfd, NFDBITS);
746: read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));
1.1 markus 747:
1.82 djm 748: for (j = 0; j < fopt_count; j++) {
749: if (argv[j] == NULL)
750: fp = stdin;
751: else if ((fp = fopen(argv[j], "r")) == NULL)
752: fatal("%s: %s: %s", __progname, argv[j],
753: strerror(errno));
754:
1.120 markus 755: while (getline(&line, &linesize, fp) != -1) {
1.82 djm 756: /* Chomp off trailing whitespace and comments */
757: if ((cp = strchr(line, '#')) == NULL)
758: cp = line + strlen(line) - 1;
759: while (cp >= line) {
760: if (*cp == ' ' || *cp == '\t' ||
761: *cp == '\n' || *cp == '#')
762: *cp-- = '\0';
763: else
764: break;
765: }
766:
767: /* Skip empty lines */
768: if (*line == '\0')
1.28 danh 769: continue;
1.82 djm 770:
771: do_host(line);
1.26 markus 772: }
1.82 djm 773:
774: if (ferror(fp))
775: fatal("%s: %s: %s", __progname, argv[j],
776: strerror(errno));
777:
778: fclose(fp);
1.26 markus 779: }
1.120 markus 780: free(line);
1.26 markus 781:
782: while (optind < argc)
783: do_host(argv[optind++]);
1.1 markus 784:
785: while (ncon > 0)
786: conloop();
787:
1.126 djm 788: return found_one ? 0 : 1;
1.1 markus 789: }
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