Annotation of src/usr.bin/ssh/ssh-keyscan.c, Revision 1.143
1.143 ! djm 1: /* $OpenBSD: ssh-keyscan.c,v 1.142 2021/11/12 05:23:49 deraadt 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>
1.141 deraadt 25: #include <poll.h>
1.73 deraadt 26: #include <signal.h>
1.69 stevesk 27: #include <string.h>
1.68 stevesk 28: #include <unistd.h>
1.1 markus 29:
30: #include "xmalloc.h"
31: #include "ssh.h"
1.95 markus 32: #include "sshbuf.h"
33: #include "sshkey.h"
1.73 deraadt 34: #include "cipher.h"
1.26 markus 35: #include "kex.h"
36: #include "compat.h"
37: #include "myproposal.h"
38: #include "packet.h"
39: #include "dispatch.h"
1.11 markus 40: #include "log.h"
1.18 deraadt 41: #include "atomicio.h"
1.26 markus 42: #include "misc.h"
1.51 djm 43: #include "hostfile.h"
1.95 markus 44: #include "ssherr.h"
45: #include "ssh_api.h"
1.117 djm 46: #include "dns.h"
1.1 markus 47:
1.26 markus 48: /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
49: Default value is AF_UNSPEC means both IPv4 and IPv6. */
50: int IPv4or6 = AF_UNSPEC;
51:
52: int ssh_port = SSH_DEFAULT_PORT;
1.1 markus 53:
1.112 djm 54: #define KT_DSA (1)
55: #define KT_RSA (1<<1)
56: #define KT_ECDSA (1<<2)
57: #define KT_ED25519 (1<<3)
1.118 markus 58: #define KT_XMSS (1<<4)
1.131 djm 59: #define KT_ECDSA_SK (1<<5)
60: #define KT_ED25519_SK (1<<6)
1.112 djm 61:
62: #define KT_MIN KT_DSA
1.131 djm 63: #define KT_MAX KT_ED25519_SK
1.26 markus 64:
1.103 djm 65: int get_cert = 0;
1.131 djm 66: int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519|KT_ECDSA_SK|KT_ED25519_SK;
1.1 markus 67:
1.51 djm 68: int hash_hosts = 0; /* Hash hostname on output */
69:
1.117 djm 70: int print_sshfp = 0; /* Print SSHFP records instead of known_hosts */
71:
1.126 djm 72: int found_one = 0; /* Successfully found a key */
73:
1.1 markus 74: #define MAXMAXFD 256
75:
76: /* The number of seconds after which to give up on a TCP connection */
77: int timeout = 5;
78:
79: int maxfd;
1.18 deraadt 80: #define MAXCON (maxfd - 10)
1.1 markus 81:
1.3 markus 82: extern char *__progname;
1.141 deraadt 83: struct pollfd *read_wait;
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 */
1.141 deraadt 108: struct timespec c_ts; /* Time at which connection gets aborted */
1.1 markus 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;
1.138 djm 278: c->c_ssh->kex->kex[KEX_KEM_SNTRUP761X25519_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: {
1.140 dtucker 290: char *hostport = NULL, *hashed = NULL;
291: const char *known_host;
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);
1.140 dtucker 309: free(hashed);
1.101 djm 310: free(hostport);
1.102 djm 311: }
312:
313: static void
314: keyprint(con *c, struct sshkey *key)
315: {
316: char *hosts = c->c_output_name ? c->c_output_name : c->c_name;
317: char *host, *ohosts;
318:
319: if (key == NULL)
320: return;
1.103 djm 321: if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) {
1.102 djm 322: keyprint_one(hosts, key);
323: return;
324: }
325: ohosts = hosts = xstrdup(hosts);
326: while ((host = strsep(&hosts, ",")) != NULL)
327: keyprint_one(host, key);
328: free(ohosts);
1.1 markus 329: }
330:
1.24 itojun 331: static int
1.1 markus 332: tcpconnect(char *host)
333: {
334: struct addrinfo hints, *ai, *aitop;
335: char strport[NI_MAXSERV];
336: int gaierr, s = -1;
337:
1.26 markus 338: snprintf(strport, sizeof strport, "%d", ssh_port);
1.1 markus 339: memset(&hints, 0, sizeof(hints));
1.26 markus 340: hints.ai_family = IPv4or6;
1.1 markus 341: hints.ai_socktype = SOCK_STREAM;
1.97 djm 342: if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
343: error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
344: return -1;
345: }
1.1 markus 346: for (ai = aitop; ai; ai = ai->ai_next) {
1.81 dtucker 347: s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.128 deraadt 348: if (s == -1) {
1.1 markus 349: error("socket: %s", strerror(errno));
350: continue;
351: }
1.49 djm 352: if (set_nonblock(s) == -1)
1.136 djm 353: fatal_f("set_nonblock(%d)", s);
1.128 deraadt 354: if (connect(s, ai->ai_addr, ai->ai_addrlen) == -1 &&
1.1 markus 355: errno != EINPROGRESS)
356: error("connect (`%s'): %s", host, strerror(errno));
357: else
358: break;
359: close(s);
360: s = -1;
361: }
362: freeaddrinfo(aitop);
363: return s;
364: }
365:
1.24 itojun 366: static int
1.26 markus 367: conalloc(char *iname, char *oname, int keytype)
1.1 markus 368: {
1.39 deraadt 369: char *namebase, *name, *namelist;
1.1 markus 370: int s;
371:
372: namebase = namelist = xstrdup(iname);
373:
374: do {
375: name = xstrsep(&namelist, ",");
376: if (!name) {
1.87 djm 377: free(namebase);
1.1 markus 378: return (-1);
379: }
380: } while ((s = tcpconnect(name)) < 0);
381:
382: if (s >= maxfd)
1.4 markus 383: fatal("conalloc: fdno %d too high", s);
1.1 markus 384: if (fdcon[s].c_status)
1.4 markus 385: fatal("conalloc: attempt to reuse fdno %d", s);
1.1 markus 386:
1.136 djm 387: debug3_f("oname %s kt %d", oname, keytype);
1.1 markus 388: fdcon[s].c_fd = s;
389: fdcon[s].c_status = CS_CON;
390: fdcon[s].c_namebase = namebase;
391: fdcon[s].c_name = name;
392: fdcon[s].c_namelist = namelist;
393: fdcon[s].c_output_name = xstrdup(oname);
394: fdcon[s].c_data = (char *) &fdcon[s].c_plen;
395: fdcon[s].c_len = 4;
396: fdcon[s].c_off = 0;
1.26 markus 397: fdcon[s].c_keytype = keytype;
1.141 deraadt 398: monotime_ts(&fdcon[s].c_ts);
399: fdcon[s].c_ts.tv_sec += timeout;
1.1 markus 400: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
1.141 deraadt 401: read_wait[s].fd = s;
402: read_wait[s].events = POLLIN;
1.1 markus 403: ncon++;
404: return (s);
405: }
406:
1.24 itojun 407: static void
1.1 markus 408: confree(int s)
409: {
410: if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
1.4 markus 411: fatal("confree: attempt to free bad fdno %d", s);
1.87 djm 412: free(fdcon[s].c_namebase);
413: free(fdcon[s].c_output_name);
1.1 markus 414: if (fdcon[s].c_status == CS_KEYS)
1.87 djm 415: free(fdcon[s].c_data);
1.1 markus 416: fdcon[s].c_status = CS_UNUSED;
1.26 markus 417: fdcon[s].c_keytype = 0;
1.95 markus 418: if (fdcon[s].c_ssh) {
419: ssh_packet_close(fdcon[s].c_ssh);
420: free(fdcon[s].c_ssh);
421: fdcon[s].c_ssh = NULL;
1.115 dtucker 422: } else
423: close(s);
1.1 markus 424: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
1.141 deraadt 425: read_wait[s].fd = -1;
426: read_wait[s].events = 0;
1.1 markus 427: ncon--;
428: }
429:
1.24 itojun 430: static void
1.1 markus 431: contouch(int s)
432: {
433: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
1.141 deraadt 434: monotime_ts(&fdcon[s].c_ts);
435: fdcon[s].c_ts.tv_sec += timeout;
1.1 markus 436: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
437: }
438:
1.24 itojun 439: static int
1.1 markus 440: conrecycle(int s)
441: {
1.39 deraadt 442: con *c = &fdcon[s];
1.1 markus 443: int ret;
444:
1.26 markus 445: ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
1.1 markus 446: confree(s);
447: return (ret);
448: }
449:
1.24 itojun 450: static void
1.1 markus 451: congreet(int s)
452: {
1.55 djm 453: int n = 0, remote_major = 0, remote_minor = 0;
1.26 markus 454: char buf[256], *cp;
1.33 markus 455: char remote_version[sizeof buf];
1.55 djm 456: size_t bufsiz;
1.1 markus 457: con *c = &fdcon[s];
458:
1.112 djm 459: /* send client banner */
460: n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
461: PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2);
462: if (n < 0 || (size_t)n >= sizeof(buf)) {
463: error("snprintf: buffer too small");
464: confree(s);
465: return;
466: }
467: if (atomicio(vwrite, s, buf, n) != (size_t)n) {
468: error("write (%s): %s", c->c_name, strerror(errno));
469: confree(s);
470: return;
471: }
472:
1.57 djm 473: for (;;) {
474: memset(buf, '\0', sizeof(buf));
475: bufsiz = sizeof(buf);
476: cp = buf;
477: while (bufsiz-- &&
478: (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
479: if (*cp == '\r')
480: *cp = '\n';
481: cp++;
482: }
483: if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
484: break;
1.27 markus 485: }
1.54 avsm 486: if (n == 0) {
487: switch (errno) {
488: case EPIPE:
489: error("%s: Connection closed by remote host", c->c_name);
490: break;
491: case ECONNREFUSED:
492: break;
493: default:
1.1 markus 494: error("read (%s): %s", c->c_name, strerror(errno));
1.54 avsm 495: break;
496: }
1.1 markus 497: conrecycle(s);
498: return;
499: }
1.21 millert 500: if (*cp != '\n' && *cp != '\r') {
1.1 markus 501: error("%s: bad greeting", c->c_name);
502: confree(s);
503: return;
504: }
1.21 millert 505: *cp = '\0';
1.98 djm 506: if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL)
507: fatal("ssh_packet_set_connection failed");
1.99 djm 508: ssh_packet_set_timeout(c->c_ssh, timeout, 1);
1.95 markus 509: ssh_set_app_data(c->c_ssh, c); /* back link */
1.139 djm 510: c->c_ssh->compat = 0;
1.33 markus 511: if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
512: &remote_major, &remote_minor, remote_version) == 3)
1.139 djm 513: compat_banner(c->c_ssh, remote_version);
1.112 djm 514: if (!ssh2_capable(remote_major, remote_minor)) {
515: debug("%s doesn't support ssh2", c->c_name);
1.33 markus 516: confree(s);
517: return;
1.26 markus 518: }
1.117 djm 519: fprintf(stderr, "%c %s:%d %s\n", print_sshfp ? ';' : '#',
520: c->c_name, ssh_port, chop(buf));
1.112 djm 521: keygrab_ssh2(c);
522: confree(s);
1.1 markus 523: }
524:
1.24 itojun 525: static void
1.1 markus 526: conread(int s)
527: {
1.39 deraadt 528: con *c = &fdcon[s];
1.54 avsm 529: size_t n;
1.1 markus 530:
531: if (c->c_status == CS_CON) {
532: congreet(s);
533: return;
534: }
1.50 avsm 535: n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
1.54 avsm 536: if (n == 0) {
1.1 markus 537: error("read (%s): %s", c->c_name, strerror(errno));
538: confree(s);
539: return;
540: }
541: c->c_off += n;
542:
543: if (c->c_off == c->c_len)
544: switch (c->c_status) {
545: case CS_SIZE:
546: c->c_plen = htonl(c->c_plen);
547: c->c_len = c->c_plen + 8 - (c->c_plen & 7);
548: c->c_off = 0;
549: c->c_data = xmalloc(c->c_len);
550: c->c_status = CS_KEYS;
551: break;
552: default:
1.4 markus 553: fatal("conread: invalid status %d", c->c_status);
1.1 markus 554: break;
555: }
556:
557: contouch(s);
558: }
559:
1.24 itojun 560: static void
1.1 markus 561: conloop(void)
562: {
1.141 deraadt 563: struct timespec seltime, now;
1.39 deraadt 564: con *c;
1.1 markus 565: int i;
566:
1.141 deraadt 567: monotime_ts(&now);
1.36 itojun 568: c = TAILQ_FIRST(&tq);
1.1 markus 569:
1.141 deraadt 570: if (c && timespeccmp(&c->c_ts, &now, >))
571: timespecsub(&c->c_ts, &now, &seltime);
1.132 cheloha 572: else
1.141 deraadt 573: timespecclear(&seltime);
1.1 markus 574:
1.141 deraadt 575: while (ppoll(read_wait, maxfd, &seltime, NULL) == -1 &&
1.16 deraadt 576: (errno == EAGAIN || errno == EINTR))
577: ;
578:
1.18 deraadt 579: for (i = 0; i < maxfd; i++) {
1.141 deraadt 580: if (read_wait[i].revents & (POLLHUP|POLLERR|POLLNVAL))
1.1 markus 581: confree(i);
1.143 ! djm 582: else if (read_wait[i].revents & (POLLIN|POLLHUP))
1.1 markus 583: conread(i);
1.18 deraadt 584: }
1.1 markus 585:
1.36 itojun 586: c = TAILQ_FIRST(&tq);
1.141 deraadt 587: while (c && timespeccmp(&c->c_ts, &now, <)) {
1.1 markus 588: int s = c->c_fd;
1.18 deraadt 589:
1.36 itojun 590: c = TAILQ_NEXT(c, c_link);
1.1 markus 591: conrecycle(s);
592: }
593: }
594:
1.26 markus 595: static void
596: do_host(char *host)
1.1 markus 597: {
1.26 markus 598: char *name = strnnsep(&host, " \t\n");
599: int j;
1.1 markus 600:
1.31 markus 601: if (name == NULL)
602: return;
1.112 djm 603: for (j = KT_MIN; j <= KT_MAX; j *= 2) {
1.26 markus 604: if (get_keytypes & j) {
605: while (ncon >= MAXCON)
606: conloop();
607: conalloc(name, *host ? host : name, j);
1.1 markus 608: }
609: }
610: }
611:
1.34 markus 612: void
1.134 djm 613: sshfatal(const char *file, const char *func, int line, int showfunc,
1.135 djm 614: LogLevel level, const char *suffix, const char *fmt, ...)
1.26 markus 615: {
1.34 markus 616: va_list args;
1.39 deraadt 617:
1.34 markus 618: va_start(args, fmt);
1.137 djm 619: sshlogv(file, func, line, showfunc, level, suffix, fmt, args);
1.34 markus 620: va_end(args);
1.133 djm 621: cleanup_exit(255);
1.26 markus 622: }
623:
624: static void
1.1 markus 625: usage(void)
626: {
1.77 sobrado 627: fprintf(stderr,
1.117 djm 628: "usage: %s [-46cDHv] [-f file] [-p port] [-T timeout] [-t type]\n"
1.119 jmc 629: "\t\t [host | addrlist namelist]\n",
1.25 jakob 630: __progname);
631: exit(1);
1.1 markus 632: }
633:
634: int
635: main(int argc, char **argv)
636: {
1.26 markus 637: int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
1.82 djm 638: int opt, fopt_count = 0, j;
1.120 markus 639: char *tname, *cp, *line = NULL;
640: size_t linesize = 0;
1.82 djm 641: FILE *fp;
1.26 markus 642:
643: extern int optind;
644: extern char *optarg;
1.1 markus 645:
646: TAILQ_INIT(&tq);
1.56 djm 647:
648: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
649: sanitise_stdfd();
1.1 markus 650:
1.26 markus 651: if (argc <= 1)
1.1 markus 652: usage();
653:
1.117 djm 654: while ((opt = getopt(argc, argv, "cDHv46p:T:t:f:")) != -1) {
1.26 markus 655: switch (opt) {
1.51 djm 656: case 'H':
657: hash_hosts = 1;
1.103 djm 658: break;
659: case 'c':
660: get_cert = 1;
1.117 djm 661: break;
662: case 'D':
663: print_sshfp = 1;
1.51 djm 664: break;
1.26 markus 665: case 'p':
666: ssh_port = a2port(optarg);
1.78 djm 667: if (ssh_port <= 0) {
1.26 markus 668: fprintf(stderr, "Bad port '%s'\n", optarg);
669: exit(1);
670: }
671: break;
672: case 'T':
1.38 stevesk 673: timeout = convtime(optarg);
674: if (timeout == -1 || timeout == 0) {
675: fprintf(stderr, "Bad timeout '%s'\n", optarg);
1.1 markus 676: usage();
1.38 stevesk 677: }
1.26 markus 678: break;
679: case 'v':
680: if (!debug_flag) {
681: debug_flag = 1;
682: log_level = SYSLOG_LEVEL_DEBUG1;
683: }
684: else if (log_level < SYSLOG_LEVEL_DEBUG3)
685: log_level++;
686: else
687: fatal("Too high debugging level.");
688: break;
689: case 'f':
690: if (strcmp(optarg, "-") == 0)
691: optarg = NULL;
692: argv[fopt_count++] = optarg;
693: break;
694: case 't':
695: get_keytypes = 0;
696: tname = strtok(optarg, ",");
697: while (tname) {
1.95 markus 698: int type = sshkey_type_from_name(tname);
1.107 djm 699:
1.26 markus 700: switch (type) {
701: case KEY_DSA:
702: get_keytypes |= KT_DSA;
1.83 djm 703: break;
704: case KEY_ECDSA:
705: get_keytypes |= KT_ECDSA;
1.26 markus 706: break;
707: case KEY_RSA:
708: get_keytypes |= KT_RSA;
1.89 markus 709: break;
710: case KEY_ED25519:
711: get_keytypes |= KT_ED25519;
1.118 markus 712: break;
713: case KEY_XMSS:
714: get_keytypes |= KT_XMSS;
1.131 djm 715: break;
716: case KEY_ED25519_SK:
717: get_keytypes |= KT_ED25519_SK;
718: break;
719: case KEY_ECDSA_SK:
720: get_keytypes |= KT_ECDSA_SK;
1.26 markus 721: break;
722: case KEY_UNSPEC:
1.107 djm 723: default:
724: fatal("Unknown key type \"%s\"", tname);
1.26 markus 725: }
726: tname = strtok(NULL, ",");
727: }
728: break;
729: case '4':
730: IPv4or6 = AF_INET;
731: break;
732: case '6':
733: IPv4or6 = AF_INET6;
734: break;
735: case '?':
736: default:
737: usage();
1.1 markus 738: }
739: }
1.26 markus 740: if (optind == argc && !fopt_count)
1.1 markus 741: usage();
742:
1.26 markus 743: log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
744:
1.1 markus 745: maxfd = fdlim_get(1);
746: if (maxfd < 0)
1.4 markus 747: fatal("%s: fdlim_get: bad value", __progname);
1.1 markus 748: if (maxfd > MAXMAXFD)
749: maxfd = MAXMAXFD;
1.18 deraadt 750: if (MAXCON <= 0)
1.4 markus 751: fatal("%s: not enough file descriptors", __progname);
1.1 markus 752: if (maxfd > fdlim_get(0))
753: fdlim_set(maxfd);
1.63 djm 754: fdcon = xcalloc(maxfd, sizeof(con));
1.141 deraadt 755: read_wait = xcalloc(maxfd, sizeof(struct pollfd));
1.142 deraadt 756: for (j = 0; j < maxfd; j++)
757: read_wait[j].fd = -1;
1.1 markus 758:
1.82 djm 759: for (j = 0; j < fopt_count; j++) {
760: if (argv[j] == NULL)
761: fp = stdin;
762: else if ((fp = fopen(argv[j], "r")) == NULL)
1.136 djm 763: fatal("%s: %s: %s", __progname, argv[j], strerror(errno));
1.82 djm 764:
1.120 markus 765: while (getline(&line, &linesize, fp) != -1) {
1.82 djm 766: /* Chomp off trailing whitespace and comments */
767: if ((cp = strchr(line, '#')) == NULL)
768: cp = line + strlen(line) - 1;
769: while (cp >= line) {
770: if (*cp == ' ' || *cp == '\t' ||
771: *cp == '\n' || *cp == '#')
772: *cp-- = '\0';
773: else
774: break;
775: }
776:
777: /* Skip empty lines */
778: if (*line == '\0')
1.28 danh 779: continue;
1.82 djm 780:
781: do_host(line);
1.26 markus 782: }
1.82 djm 783:
784: if (ferror(fp))
1.136 djm 785: fatal("%s: %s: %s", __progname, argv[j], strerror(errno));
1.82 djm 786:
787: fclose(fp);
1.26 markus 788: }
1.120 markus 789: free(line);
1.26 markus 790:
791: while (optind < argc)
792: do_host(argv[optind++]);
1.1 markus 793:
794: while (ncon > 0)
795: conloop();
796:
1.126 djm 797: return found_one ? 0 : 1;
1.1 markus 798: }