Annotation of src/usr.bin/ssh/ssh-keyscan.c, Revision 1.134
1.134 ! djm 1: /* $OpenBSD: ssh-keyscan.c,v 1.133 2020/10/16 13:24:45 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)
1.131 djm 58: #define KT_ECDSA_SK (1<<5)
59: #define KT_ED25519_SK (1<<6)
1.112 djm 60:
61: #define KT_MIN KT_DSA
1.131 djm 62: #define KT_MAX KT_ED25519_SK
1.26 markus 63:
1.103 djm 64: int get_cert = 0;
1.131 djm 65: int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519|KT_ECDSA_SK|KT_ED25519_SK;
1.1 markus 66:
1.51 djm 67: int hash_hosts = 0; /* Hash hostname on output */
68:
1.117 djm 69: int print_sshfp = 0; /* Print SSHFP records instead of known_hosts */
70:
1.126 djm 71: int found_one = 0; /* Successfully found a key */
72:
1.1 markus 73: #define MAXMAXFD 256
74:
75: /* The number of seconds after which to give up on a TCP connection */
76: int timeout = 5;
77:
78: int maxfd;
1.18 deraadt 79: #define MAXCON (maxfd - 10)
1.1 markus 80:
1.3 markus 81: extern char *__progname;
1.19 millert 82: fd_set *read_wait;
1.63 djm 83: size_t read_wait_nfdset;
1.1 markus 84: int ncon;
85:
86: /*
87: * Keep a connection structure for each file descriptor. The state
88: * associated with file descriptor n is held in fdcon[n].
89: */
90: typedef struct Connection {
1.6 markus 91: u_char c_status; /* State of connection on this file desc. */
1.1 markus 92: #define CS_UNUSED 0 /* File descriptor unused */
93: #define CS_CON 1 /* Waiting to connect/read greeting */
94: #define CS_SIZE 2 /* Waiting to read initial packet size */
95: #define CS_KEYS 3 /* Waiting to read public key packet */
96: int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
97: int c_plen; /* Packet length field for ssh packet */
98: int c_len; /* Total bytes which must be read. */
99: int c_off; /* Length of data read so far. */
1.112 djm 100: int c_keytype; /* Only one of KT_* */
1.100 miod 101: sig_atomic_t c_done; /* SSH2 done */
1.1 markus 102: char *c_namebase; /* Address to free for c_name and c_namelist */
103: char *c_name; /* Hostname of connection for errors */
104: char *c_namelist; /* Pointer to other possible addresses */
105: char *c_output_name; /* Hostname of connection for output */
106: char *c_data; /* Data read from this fd */
1.95 markus 107: struct ssh *c_ssh; /* SSH-connection */
1.1 markus 108: struct timeval c_tv; /* Time at which connection gets aborted */
109: TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
110: } con;
111:
112: TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
113: con *fdcon;
114:
1.95 markus 115: static void keyprint(con *c, struct sshkey *key);
116:
1.24 itojun 117: static int
1.1 markus 118: fdlim_get(int hard)
119: {
120: struct rlimit rlfd;
1.17 deraadt 121:
1.128 deraadt 122: if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1)
1.1 markus 123: return (-1);
124: if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
1.46 djm 125: return sysconf(_SC_OPEN_MAX);
1.1 markus 126: else
127: return hard ? rlfd.rlim_max : rlfd.rlim_cur;
128: }
129:
1.24 itojun 130: static int
1.1 markus 131: fdlim_set(int lim)
132: {
133: struct rlimit rlfd;
1.39 deraadt 134:
1.1 markus 135: if (lim <= 0)
136: return (-1);
1.128 deraadt 137: if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1)
1.1 markus 138: return (-1);
139: rlfd.rlim_cur = lim;
1.128 deraadt 140: if (setrlimit(RLIMIT_NOFILE, &rlfd) == -1)
1.1 markus 141: return (-1);
142: return (0);
143: }
144:
145: /*
146: * This is an strsep function that returns a null field for adjacent
147: * separators. This is the same as the 4.4BSD strsep, but different from the
148: * one in the GNU libc.
149: */
1.24 itojun 150: static char *
1.1 markus 151: xstrsep(char **str, const char *delim)
152: {
153: char *s, *e;
154:
155: if (!**str)
156: return (NULL);
157:
158: s = *str;
159: e = s + strcspn(s, delim);
160:
161: if (*e != '\0')
162: *e++ = '\0';
163: *str = e;
164:
165: return (s);
166: }
167:
168: /*
169: * Get the next non-null token (like GNU strsep). Strsep() will return a
170: * null token for two adjacent separators, so we may have to loop.
171: */
1.24 itojun 172: static char *
1.1 markus 173: strnnsep(char **stringp, char *delim)
174: {
175: char *tok;
176:
177: do {
178: tok = xstrsep(stringp, delim);
179: } while (tok && *tok == '\0');
180: return (tok);
181: }
182:
1.26 markus 183:
184: static int
1.95 markus 185: key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh)
1.26 markus 186: {
1.95 markus 187: con *c;
188:
189: if ((c = ssh_get_app_data(ssh)) != NULL)
190: keyprint(c, hostkey);
191: /* always abort key exchange */
192: return -1;
1.26 markus 193: }
194:
195: static int
196: ssh2_capable(int remote_major, int remote_minor)
197: {
198: switch (remote_major) {
199: case 1:
200: if (remote_minor == 99)
201: return 1;
202: break;
203: case 2:
204: return 1;
205: default:
206: break;
207: }
208: return 0;
209: }
210:
1.95 markus 211: static void
1.26 markus 212: keygrab_ssh2(con *c)
213: {
1.91 markus 214: char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
1.95 markus 215: int r;
1.26 markus 216:
1.103 djm 217: switch (c->c_keytype) {
218: case KT_DSA:
219: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
220: "ssh-dss-cert-v01@openssh.com" : "ssh-dss";
221: break;
222: case KT_RSA:
223: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
1.129 djm 224: "rsa-sha2-512-cert-v01@openssh.com,"
225: "rsa-sha2-256-cert-v01@openssh.com,"
226: "ssh-rsa-cert-v01@openssh.com" :
227: "rsa-sha2-512,"
228: "rsa-sha2-256,"
229: "ssh-rsa";
1.103 djm 230: break;
231: case KT_ED25519:
232: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
233: "ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519";
234: break;
1.118 markus 235: case KT_XMSS:
236: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
237: "ssh-xmss-cert-v01@openssh.com" : "ssh-xmss@openssh.com";
238: break;
1.103 djm 239: case KT_ECDSA:
240: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
241: "ecdsa-sha2-nistp256-cert-v01@openssh.com,"
242: "ecdsa-sha2-nistp384-cert-v01@openssh.com,"
243: "ecdsa-sha2-nistp521-cert-v01@openssh.com" :
244: "ecdsa-sha2-nistp256,"
245: "ecdsa-sha2-nistp384,"
246: "ecdsa-sha2-nistp521";
247: break;
1.131 djm 248: case KT_ECDSA_SK:
249: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
250: "sk-ecdsa-sha2-nistp256-cert-v01@openssh.com" :
251: "sk-ecdsa-sha2-nistp256@openssh.com";
252: break;
253: case KT_ED25519_SK:
254: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
255: "sk-ssh-ed25519-cert-v01@openssh.com" :
256: "sk-ssh-ed25519@openssh.com";
257: break;
1.103 djm 258: default:
259: fatal("unknown key type %d", c->c_keytype);
260: break;
261: }
1.95 markus 262: if ((r = kex_setup(c->c_ssh, myproposal)) != 0) {
263: free(c->c_ssh);
264: fprintf(stderr, "kex_setup: %s\n", ssh_err(r));
265: exit(1);
266: }
1.92 markus 267: #ifdef WITH_OPENSSL
1.125 djm 268: c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_client;
269: c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_client;
270: c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_client;
271: c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_client;
272: c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_client;
1.95 markus 273: c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
274: c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
1.125 djm 275: c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kex_gen_client;
1.92 markus 276: #endif
1.125 djm 277: c->c_ssh->kex->kex[KEX_C25519_SHA256] = kex_gen_client;
278: c->c_ssh->kex->kex[KEX_KEM_SNTRUP4591761X25519_SHA512] = kex_gen_client;
1.95 markus 279: ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper);
280: /*
281: * do the key-exchange until an error occurs or until
282: * the key_print_wrapper() callback sets c_done.
283: */
1.114 markus 284: ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done);
1.26 markus 285: }
286:
287: static void
1.108 djm 288: keyprint_one(const char *host, struct sshkey *key)
1.26 markus 289: {
1.102 djm 290: char *hostport;
1.108 djm 291: const char *known_host, *hashed;
1.51 djm 292:
1.126 djm 293: found_one = 1;
294:
1.117 djm 295: if (print_sshfp) {
296: export_dns_rr(host, key, stdout, 0);
297: return;
298: }
299:
1.108 djm 300: hostport = put_host_port(host, ssh_port);
1.109 djm 301: lowercase(hostport);
1.108 djm 302: if (hash_hosts && (hashed = host_hash(host, NULL, 0)) == NULL)
1.51 djm 303: fatal("host_hash failed");
1.108 djm 304: known_host = hash_hosts ? hashed : hostport;
1.103 djm 305: if (!get_cert)
1.108 djm 306: fprintf(stdout, "%s ", known_host);
1.95 markus 307: sshkey_write(key, stdout);
1.1 markus 308: fputs("\n", stdout);
1.101 djm 309: free(hostport);
1.102 djm 310: }
311:
312: static void
313: keyprint(con *c, struct sshkey *key)
314: {
315: char *hosts = c->c_output_name ? c->c_output_name : c->c_name;
316: char *host, *ohosts;
317:
318: if (key == NULL)
319: return;
1.103 djm 320: if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) {
1.102 djm 321: keyprint_one(hosts, key);
322: return;
323: }
324: ohosts = hosts = xstrdup(hosts);
325: while ((host = strsep(&hosts, ",")) != NULL)
326: keyprint_one(host, key);
327: free(ohosts);
1.1 markus 328: }
329:
1.24 itojun 330: static int
1.1 markus 331: tcpconnect(char *host)
332: {
333: struct addrinfo hints, *ai, *aitop;
334: char strport[NI_MAXSERV];
335: int gaierr, s = -1;
336:
1.26 markus 337: snprintf(strport, sizeof strport, "%d", ssh_port);
1.1 markus 338: memset(&hints, 0, sizeof(hints));
1.26 markus 339: hints.ai_family = IPv4or6;
1.1 markus 340: hints.ai_socktype = SOCK_STREAM;
1.97 djm 341: if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
342: error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
343: return -1;
344: }
1.1 markus 345: for (ai = aitop; ai; ai = ai->ai_next) {
1.81 dtucker 346: s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.128 deraadt 347: if (s == -1) {
1.1 markus 348: error("socket: %s", strerror(errno));
349: continue;
350: }
1.49 djm 351: if (set_nonblock(s) == -1)
352: fatal("%s: set_nonblock(%d)", __func__, s);
1.128 deraadt 353: if (connect(s, ai->ai_addr, ai->ai_addrlen) == -1 &&
1.1 markus 354: errno != EINPROGRESS)
355: error("connect (`%s'): %s", host, strerror(errno));
356: else
357: break;
358: close(s);
359: s = -1;
360: }
361: freeaddrinfo(aitop);
362: return s;
363: }
364:
1.24 itojun 365: static int
1.26 markus 366: conalloc(char *iname, char *oname, int keytype)
1.1 markus 367: {
1.39 deraadt 368: char *namebase, *name, *namelist;
1.1 markus 369: int s;
370:
371: namebase = namelist = xstrdup(iname);
372:
373: do {
374: name = xstrsep(&namelist, ",");
375: if (!name) {
1.87 djm 376: free(namebase);
1.1 markus 377: return (-1);
378: }
379: } while ((s = tcpconnect(name)) < 0);
380:
381: if (s >= maxfd)
1.4 markus 382: fatal("conalloc: fdno %d too high", s);
1.1 markus 383: if (fdcon[s].c_status)
1.4 markus 384: fatal("conalloc: attempt to reuse fdno %d", s);
1.1 markus 385:
1.103 djm 386: debug3("%s: oname %s kt %d", __func__, oname, keytype);
1.1 markus 387: fdcon[s].c_fd = s;
388: fdcon[s].c_status = CS_CON;
389: fdcon[s].c_namebase = namebase;
390: fdcon[s].c_name = name;
391: fdcon[s].c_namelist = namelist;
392: fdcon[s].c_output_name = xstrdup(oname);
393: fdcon[s].c_data = (char *) &fdcon[s].c_plen;
394: fdcon[s].c_len = 4;
395: fdcon[s].c_off = 0;
1.26 markus 396: fdcon[s].c_keytype = keytype;
1.116 dtucker 397: monotime_tv(&fdcon[s].c_tv);
1.1 markus 398: fdcon[s].c_tv.tv_sec += timeout;
399: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
1.19 millert 400: FD_SET(s, read_wait);
1.1 markus 401: ncon++;
402: return (s);
403: }
404:
1.24 itojun 405: static void
1.1 markus 406: confree(int s)
407: {
408: if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
1.4 markus 409: fatal("confree: attempt to free bad fdno %d", s);
1.87 djm 410: free(fdcon[s].c_namebase);
411: free(fdcon[s].c_output_name);
1.1 markus 412: if (fdcon[s].c_status == CS_KEYS)
1.87 djm 413: free(fdcon[s].c_data);
1.1 markus 414: fdcon[s].c_status = CS_UNUSED;
1.26 markus 415: fdcon[s].c_keytype = 0;
1.95 markus 416: if (fdcon[s].c_ssh) {
417: ssh_packet_close(fdcon[s].c_ssh);
418: free(fdcon[s].c_ssh);
419: fdcon[s].c_ssh = NULL;
1.115 dtucker 420: } else
421: close(s);
1.1 markus 422: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
1.19 millert 423: FD_CLR(s, read_wait);
1.1 markus 424: ncon--;
425: }
426:
1.24 itojun 427: static void
1.1 markus 428: contouch(int s)
429: {
430: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
1.116 dtucker 431: monotime_tv(&fdcon[s].c_tv);
1.1 markus 432: fdcon[s].c_tv.tv_sec += timeout;
433: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
434: }
435:
1.24 itojun 436: static int
1.1 markus 437: conrecycle(int s)
438: {
1.39 deraadt 439: con *c = &fdcon[s];
1.1 markus 440: int ret;
441:
1.26 markus 442: ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
1.1 markus 443: confree(s);
444: return (ret);
445: }
446:
1.24 itojun 447: static void
1.1 markus 448: congreet(int s)
449: {
1.55 djm 450: int n = 0, remote_major = 0, remote_minor = 0;
1.26 markus 451: char buf[256], *cp;
1.33 markus 452: char remote_version[sizeof buf];
1.55 djm 453: size_t bufsiz;
1.1 markus 454: con *c = &fdcon[s];
455:
1.112 djm 456: /* send client banner */
457: n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
458: PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2);
459: if (n < 0 || (size_t)n >= sizeof(buf)) {
460: error("snprintf: buffer too small");
461: confree(s);
462: return;
463: }
464: if (atomicio(vwrite, s, buf, n) != (size_t)n) {
465: error("write (%s): %s", c->c_name, strerror(errno));
466: confree(s);
467: return;
468: }
469:
1.57 djm 470: for (;;) {
471: memset(buf, '\0', sizeof(buf));
472: bufsiz = sizeof(buf);
473: cp = buf;
474: while (bufsiz-- &&
475: (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
476: if (*cp == '\r')
477: *cp = '\n';
478: cp++;
479: }
480: if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
481: break;
1.27 markus 482: }
1.54 avsm 483: if (n == 0) {
484: switch (errno) {
485: case EPIPE:
486: error("%s: Connection closed by remote host", c->c_name);
487: break;
488: case ECONNREFUSED:
489: break;
490: default:
1.1 markus 491: error("read (%s): %s", c->c_name, strerror(errno));
1.54 avsm 492: break;
493: }
1.1 markus 494: conrecycle(s);
495: return;
496: }
1.21 millert 497: if (*cp != '\n' && *cp != '\r') {
1.1 markus 498: error("%s: bad greeting", c->c_name);
499: confree(s);
500: return;
501: }
1.21 millert 502: *cp = '\0';
1.98 djm 503: if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL)
504: fatal("ssh_packet_set_connection failed");
1.99 djm 505: ssh_packet_set_timeout(c->c_ssh, timeout, 1);
1.95 markus 506: ssh_set_app_data(c->c_ssh, c); /* back link */
1.33 markus 507: if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
508: &remote_major, &remote_minor, remote_version) == 3)
1.95 markus 509: c->c_ssh->compat = compat_datafellows(remote_version);
1.33 markus 510: else
1.95 markus 511: c->c_ssh->compat = 0;
1.112 djm 512: if (!ssh2_capable(remote_major, remote_minor)) {
513: debug("%s doesn't support ssh2", c->c_name);
1.33 markus 514: confree(s);
515: return;
1.26 markus 516: }
1.117 djm 517: fprintf(stderr, "%c %s:%d %s\n", print_sshfp ? ';' : '#',
518: c->c_name, ssh_port, chop(buf));
1.112 djm 519: keygrab_ssh2(c);
520: confree(s);
1.1 markus 521: }
522:
1.24 itojun 523: static void
1.1 markus 524: conread(int s)
525: {
1.39 deraadt 526: con *c = &fdcon[s];
1.54 avsm 527: size_t n;
1.1 markus 528:
529: if (c->c_status == CS_CON) {
530: congreet(s);
531: return;
532: }
1.50 avsm 533: n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
1.54 avsm 534: if (n == 0) {
1.1 markus 535: error("read (%s): %s", c->c_name, strerror(errno));
536: confree(s);
537: return;
538: }
539: c->c_off += n;
540:
541: if (c->c_off == c->c_len)
542: switch (c->c_status) {
543: case CS_SIZE:
544: c->c_plen = htonl(c->c_plen);
545: c->c_len = c->c_plen + 8 - (c->c_plen & 7);
546: c->c_off = 0;
547: c->c_data = xmalloc(c->c_len);
548: c->c_status = CS_KEYS;
549: break;
550: default:
1.4 markus 551: fatal("conread: invalid status %d", c->c_status);
1.1 markus 552: break;
553: }
554:
555: contouch(s);
556: }
557:
1.24 itojun 558: static void
1.1 markus 559: conloop(void)
560: {
1.39 deraadt 561: struct timeval seltime, now;
1.19 millert 562: fd_set *r, *e;
1.39 deraadt 563: con *c;
1.1 markus 564: int i;
565:
1.116 dtucker 566: monotime_tv(&now);
1.36 itojun 567: c = TAILQ_FIRST(&tq);
1.1 markus 568:
1.132 cheloha 569: if (c && timercmp(&c->c_tv, &now, >))
570: timersub(&c->c_tv, &now, &seltime);
571: else
1.85 okan 572: timerclear(&seltime);
1.1 markus 573:
1.63 djm 574: r = xcalloc(read_wait_nfdset, sizeof(fd_mask));
575: e = xcalloc(read_wait_nfdset, sizeof(fd_mask));
576: memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask));
577: memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask));
1.19 millert 578:
579: while (select(maxfd, r, NULL, e, &seltime) == -1 &&
1.16 deraadt 580: (errno == EAGAIN || errno == EINTR))
581: ;
582:
1.18 deraadt 583: for (i = 0; i < maxfd; i++) {
1.19 millert 584: if (FD_ISSET(i, e)) {
1.1 markus 585: error("%s: exception!", fdcon[i].c_name);
586: confree(i);
1.19 millert 587: } else if (FD_ISSET(i, r))
1.1 markus 588: conread(i);
1.18 deraadt 589: }
1.87 djm 590: free(r);
591: free(e);
1.1 markus 592:
1.36 itojun 593: c = TAILQ_FIRST(&tq);
1.132 cheloha 594: while (c && timercmp(&c->c_tv, &now, <)) {
1.1 markus 595: int s = c->c_fd;
1.18 deraadt 596:
1.36 itojun 597: c = TAILQ_NEXT(c, c_link);
1.1 markus 598: conrecycle(s);
599: }
600: }
601:
1.26 markus 602: static void
603: do_host(char *host)
1.1 markus 604: {
1.26 markus 605: char *name = strnnsep(&host, " \t\n");
606: int j;
1.1 markus 607:
1.31 markus 608: if (name == NULL)
609: return;
1.112 djm 610: for (j = KT_MIN; j <= KT_MAX; j *= 2) {
1.26 markus 611: if (get_keytypes & j) {
612: while (ncon >= MAXCON)
613: conloop();
614: conalloc(name, *host ? host : name, j);
1.1 markus 615: }
616: }
617: }
618:
1.34 markus 619: void
1.134 ! djm 620: sshfatal(const char *file, const char *func, int line, int showfunc,
! 621: LogLevel level, const char *fmt, ...)
1.26 markus 622: {
1.34 markus 623: va_list args;
1.39 deraadt 624:
1.34 markus 625: va_start(args, fmt);
1.134 ! djm 626: ssh_log(file, func, line, showfunc, level, fmt, args);
1.34 markus 627: va_end(args);
1.133 djm 628: cleanup_exit(255);
1.26 markus 629: }
630:
631: static void
1.1 markus 632: usage(void)
633: {
1.77 sobrado 634: fprintf(stderr,
1.117 djm 635: "usage: %s [-46cDHv] [-f file] [-p port] [-T timeout] [-t type]\n"
1.119 jmc 636: "\t\t [host | addrlist namelist]\n",
1.25 jakob 637: __progname);
638: exit(1);
1.1 markus 639: }
640:
641: int
642: main(int argc, char **argv)
643: {
1.26 markus 644: int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
1.82 djm 645: int opt, fopt_count = 0, j;
1.120 markus 646: char *tname, *cp, *line = NULL;
647: size_t linesize = 0;
1.82 djm 648: FILE *fp;
1.26 markus 649:
650: extern int optind;
651: extern char *optarg;
1.1 markus 652:
653: TAILQ_INIT(&tq);
1.56 djm 654:
655: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
656: sanitise_stdfd();
1.1 markus 657:
1.26 markus 658: if (argc <= 1)
1.1 markus 659: usage();
660:
1.117 djm 661: while ((opt = getopt(argc, argv, "cDHv46p:T:t:f:")) != -1) {
1.26 markus 662: switch (opt) {
1.51 djm 663: case 'H':
664: hash_hosts = 1;
1.103 djm 665: break;
666: case 'c':
667: get_cert = 1;
1.117 djm 668: break;
669: case 'D':
670: print_sshfp = 1;
1.51 djm 671: break;
1.26 markus 672: case 'p':
673: ssh_port = a2port(optarg);
1.78 djm 674: if (ssh_port <= 0) {
1.26 markus 675: fprintf(stderr, "Bad port '%s'\n", optarg);
676: exit(1);
677: }
678: break;
679: case 'T':
1.38 stevesk 680: timeout = convtime(optarg);
681: if (timeout == -1 || timeout == 0) {
682: fprintf(stderr, "Bad timeout '%s'\n", optarg);
1.1 markus 683: usage();
1.38 stevesk 684: }
1.26 markus 685: break;
686: case 'v':
687: if (!debug_flag) {
688: debug_flag = 1;
689: log_level = SYSLOG_LEVEL_DEBUG1;
690: }
691: else if (log_level < SYSLOG_LEVEL_DEBUG3)
692: log_level++;
693: else
694: fatal("Too high debugging level.");
695: break;
696: case 'f':
697: if (strcmp(optarg, "-") == 0)
698: optarg = NULL;
699: argv[fopt_count++] = optarg;
700: break;
701: case 't':
702: get_keytypes = 0;
703: tname = strtok(optarg, ",");
704: while (tname) {
1.95 markus 705: int type = sshkey_type_from_name(tname);
1.107 djm 706:
1.26 markus 707: switch (type) {
708: case KEY_DSA:
709: get_keytypes |= KT_DSA;
1.83 djm 710: break;
711: case KEY_ECDSA:
712: get_keytypes |= KT_ECDSA;
1.26 markus 713: break;
714: case KEY_RSA:
715: get_keytypes |= KT_RSA;
1.89 markus 716: break;
717: case KEY_ED25519:
718: get_keytypes |= KT_ED25519;
1.118 markus 719: break;
720: case KEY_XMSS:
721: get_keytypes |= KT_XMSS;
1.131 djm 722: break;
723: case KEY_ED25519_SK:
724: get_keytypes |= KT_ED25519_SK;
725: break;
726: case KEY_ECDSA_SK:
727: get_keytypes |= KT_ECDSA_SK;
1.26 markus 728: break;
729: case KEY_UNSPEC:
1.107 djm 730: default:
731: fatal("Unknown key type \"%s\"", tname);
1.26 markus 732: }
733: tname = strtok(NULL, ",");
734: }
735: break;
736: case '4':
737: IPv4or6 = AF_INET;
738: break;
739: case '6':
740: IPv4or6 = AF_INET6;
741: break;
742: case '?':
743: default:
744: usage();
1.1 markus 745: }
746: }
1.26 markus 747: if (optind == argc && !fopt_count)
1.1 markus 748: usage();
749:
1.26 markus 750: log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
751:
1.1 markus 752: maxfd = fdlim_get(1);
753: if (maxfd < 0)
1.4 markus 754: fatal("%s: fdlim_get: bad value", __progname);
1.1 markus 755: if (maxfd > MAXMAXFD)
756: maxfd = MAXMAXFD;
1.18 deraadt 757: if (MAXCON <= 0)
1.4 markus 758: fatal("%s: not enough file descriptors", __progname);
1.1 markus 759: if (maxfd > fdlim_get(0))
760: fdlim_set(maxfd);
1.63 djm 761: fdcon = xcalloc(maxfd, sizeof(con));
1.19 millert 762:
1.63 djm 763: read_wait_nfdset = howmany(maxfd, NFDBITS);
764: read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));
1.1 markus 765:
1.82 djm 766: for (j = 0; j < fopt_count; j++) {
767: if (argv[j] == NULL)
768: fp = stdin;
769: else if ((fp = fopen(argv[j], "r")) == NULL)
770: fatal("%s: %s: %s", __progname, argv[j],
771: strerror(errno));
772:
1.120 markus 773: while (getline(&line, &linesize, fp) != -1) {
1.82 djm 774: /* Chomp off trailing whitespace and comments */
775: if ((cp = strchr(line, '#')) == NULL)
776: cp = line + strlen(line) - 1;
777: while (cp >= line) {
778: if (*cp == ' ' || *cp == '\t' ||
779: *cp == '\n' || *cp == '#')
780: *cp-- = '\0';
781: else
782: break;
783: }
784:
785: /* Skip empty lines */
786: if (*line == '\0')
1.28 danh 787: continue;
1.82 djm 788:
789: do_host(line);
1.26 markus 790: }
1.82 djm 791:
792: if (ferror(fp))
793: fatal("%s: %s: %s", __progname, argv[j],
794: strerror(errno));
795:
796: fclose(fp);
1.26 markus 797: }
1.120 markus 798: free(line);
1.26 markus 799:
800: while (optind < argc)
801: do_host(argv[optind++]);
1.1 markus 802:
803: while (ncon > 0)
804: conloop();
805:
1.126 djm 806: return found_one ? 0 : 1;
1.1 markus 807: }
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