Annotation of src/usr.bin/ssh/ssh-keyscan.c, Revision 1.149
1.149 ! jmc 1: /* $OpenBSD: ssh-keyscan.c,v 1.148 2022/12/04 23:50:49 cheloha 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"
1.147 djm 47: #include "addr.h"
1.1 markus 48:
1.26 markus 49: /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
50: Default value is AF_UNSPEC means both IPv4 and IPv6. */
51: int IPv4or6 = AF_UNSPEC;
52:
53: int ssh_port = SSH_DEFAULT_PORT;
1.1 markus 54:
1.112 djm 55: #define KT_DSA (1)
56: #define KT_RSA (1<<1)
57: #define KT_ECDSA (1<<2)
58: #define KT_ED25519 (1<<3)
1.118 markus 59: #define KT_XMSS (1<<4)
1.131 djm 60: #define KT_ECDSA_SK (1<<5)
61: #define KT_ED25519_SK (1<<6)
1.112 djm 62:
63: #define KT_MIN KT_DSA
1.131 djm 64: #define KT_MAX KT_ED25519_SK
1.26 markus 65:
1.103 djm 66: int get_cert = 0;
1.131 djm 67: int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519|KT_ECDSA_SK|KT_ED25519_SK;
1.1 markus 68:
1.51 djm 69: int hash_hosts = 0; /* Hash hostname on output */
70:
1.117 djm 71: int print_sshfp = 0; /* Print SSHFP records instead of known_hosts */
72:
1.126 djm 73: int found_one = 0; /* Successfully found a key */
74:
1.1 markus 75: #define MAXMAXFD 256
76:
77: /* The number of seconds after which to give up on a TCP connection */
78: int timeout = 5;
79:
80: int maxfd;
1.18 deraadt 81: #define MAXCON (maxfd - 10)
1.1 markus 82:
1.3 markus 83: extern char *__progname;
1.141 deraadt 84: struct pollfd *read_wait;
1.1 markus 85: int ncon;
86:
87: /*
88: * Keep a connection structure for each file descriptor. The state
89: * associated with file descriptor n is held in fdcon[n].
90: */
91: typedef struct Connection {
1.6 markus 92: u_char c_status; /* State of connection on this file desc. */
1.1 markus 93: #define CS_UNUSED 0 /* File descriptor unused */
94: #define CS_CON 1 /* Waiting to connect/read greeting */
95: #define CS_SIZE 2 /* Waiting to read initial packet size */
96: #define CS_KEYS 3 /* Waiting to read public key packet */
97: int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
98: int c_plen; /* Packet length field for ssh packet */
99: int c_len; /* Total bytes which must be read. */
100: int c_off; /* Length of data read so far. */
1.112 djm 101: int c_keytype; /* Only one of KT_* */
1.100 miod 102: sig_atomic_t c_done; /* SSH2 done */
1.1 markus 103: char *c_namebase; /* Address to free for c_name and c_namelist */
104: char *c_name; /* Hostname of connection for errors */
105: char *c_namelist; /* Pointer to other possible addresses */
106: char *c_output_name; /* Hostname of connection for output */
107: char *c_data; /* Data read from this fd */
1.95 markus 108: struct ssh *c_ssh; /* SSH-connection */
1.141 deraadt 109: struct timespec c_ts; /* Time at which connection gets aborted */
1.1 markus 110: TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
111: } con;
112:
113: TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
114: con *fdcon;
115:
1.95 markus 116: static void keyprint(con *c, struct sshkey *key);
117:
1.24 itojun 118: static int
1.1 markus 119: fdlim_get(int hard)
120: {
121: struct rlimit rlfd;
1.17 deraadt 122:
1.128 deraadt 123: if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1)
1.1 markus 124: return (-1);
125: if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
1.46 djm 126: return sysconf(_SC_OPEN_MAX);
1.1 markus 127: else
128: return hard ? rlfd.rlim_max : rlfd.rlim_cur;
129: }
130:
1.24 itojun 131: static int
1.1 markus 132: fdlim_set(int lim)
133: {
134: struct rlimit rlfd;
1.39 deraadt 135:
1.1 markus 136: if (lim <= 0)
137: return (-1);
1.128 deraadt 138: if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1)
1.1 markus 139: return (-1);
140: rlfd.rlim_cur = lim;
1.128 deraadt 141: if (setrlimit(RLIMIT_NOFILE, &rlfd) == -1)
1.1 markus 142: return (-1);
143: return (0);
144: }
145:
146: /*
147: * This is an strsep function that returns a null field for adjacent
148: * separators. This is the same as the 4.4BSD strsep, but different from the
149: * one in the GNU libc.
150: */
1.24 itojun 151: static char *
1.1 markus 152: xstrsep(char **str, const char *delim)
153: {
154: char *s, *e;
155:
156: if (!**str)
157: return (NULL);
158:
159: s = *str;
160: e = s + strcspn(s, delim);
161:
162: if (*e != '\0')
163: *e++ = '\0';
164: *str = e;
165:
166: return (s);
167: }
168:
169: /*
170: * Get the next non-null token (like GNU strsep). Strsep() will return a
171: * null token for two adjacent separators, so we may have to loop.
172: */
1.24 itojun 173: static char *
1.1 markus 174: strnnsep(char **stringp, char *delim)
175: {
176: char *tok;
177:
178: do {
179: tok = xstrsep(stringp, delim);
180: } while (tok && *tok == '\0');
181: return (tok);
182: }
183:
1.26 markus 184:
185: static int
1.95 markus 186: key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh)
1.26 markus 187: {
1.95 markus 188: con *c;
189:
190: if ((c = ssh_get_app_data(ssh)) != NULL)
191: keyprint(c, hostkey);
192: /* always abort key exchange */
193: return -1;
1.26 markus 194: }
195:
196: static int
197: ssh2_capable(int remote_major, int remote_minor)
198: {
199: switch (remote_major) {
200: case 1:
201: if (remote_minor == 99)
202: return 1;
203: break;
204: case 2:
205: return 1;
206: default:
207: break;
208: }
209: return 0;
210: }
211:
1.95 markus 212: static void
1.26 markus 213: keygrab_ssh2(con *c)
214: {
1.91 markus 215: char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
1.95 markus 216: int r;
1.26 markus 217:
1.103 djm 218: switch (c->c_keytype) {
219: case KT_DSA:
220: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
221: "ssh-dss-cert-v01@openssh.com" : "ssh-dss";
222: break;
223: case KT_RSA:
224: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
1.129 djm 225: "rsa-sha2-512-cert-v01@openssh.com,"
226: "rsa-sha2-256-cert-v01@openssh.com,"
227: "ssh-rsa-cert-v01@openssh.com" :
228: "rsa-sha2-512,"
229: "rsa-sha2-256,"
230: "ssh-rsa";
1.103 djm 231: break;
232: case KT_ED25519:
233: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
234: "ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519";
235: break;
1.118 markus 236: case KT_XMSS:
237: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
238: "ssh-xmss-cert-v01@openssh.com" : "ssh-xmss@openssh.com";
239: break;
1.103 djm 240: case KT_ECDSA:
241: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
242: "ecdsa-sha2-nistp256-cert-v01@openssh.com,"
243: "ecdsa-sha2-nistp384-cert-v01@openssh.com,"
244: "ecdsa-sha2-nistp521-cert-v01@openssh.com" :
245: "ecdsa-sha2-nistp256,"
246: "ecdsa-sha2-nistp384,"
247: "ecdsa-sha2-nistp521";
248: break;
1.131 djm 249: case KT_ECDSA_SK:
250: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
251: "sk-ecdsa-sha2-nistp256-cert-v01@openssh.com" :
252: "sk-ecdsa-sha2-nistp256@openssh.com";
253: break;
254: case KT_ED25519_SK:
255: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
256: "sk-ssh-ed25519-cert-v01@openssh.com" :
257: "sk-ssh-ed25519@openssh.com";
258: break;
1.103 djm 259: default:
260: fatal("unknown key type %d", c->c_keytype);
261: break;
262: }
1.95 markus 263: if ((r = kex_setup(c->c_ssh, myproposal)) != 0) {
264: free(c->c_ssh);
265: fprintf(stderr, "kex_setup: %s\n", ssh_err(r));
266: exit(1);
267: }
1.92 markus 268: #ifdef WITH_OPENSSL
1.125 djm 269: c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_client;
270: c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_client;
271: c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_client;
272: c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_client;
273: c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_client;
1.95 markus 274: c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
275: c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
1.125 djm 276: c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kex_gen_client;
1.92 markus 277: #endif
1.125 djm 278: c->c_ssh->kex->kex[KEX_C25519_SHA256] = kex_gen_client;
1.138 djm 279: c->c_ssh->kex->kex[KEX_KEM_SNTRUP761X25519_SHA512] = kex_gen_client;
1.95 markus 280: ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper);
281: /*
282: * do the key-exchange until an error occurs or until
283: * the key_print_wrapper() callback sets c_done.
284: */
1.114 markus 285: ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done);
1.26 markus 286: }
287:
288: static void
1.108 djm 289: keyprint_one(const char *host, struct sshkey *key)
1.26 markus 290: {
1.140 dtucker 291: char *hostport = NULL, *hashed = NULL;
292: const char *known_host;
1.51 djm 293:
1.126 djm 294: found_one = 1;
295:
1.117 djm 296: if (print_sshfp) {
297: export_dns_rr(host, key, stdout, 0);
298: return;
299: }
300:
1.108 djm 301: hostport = put_host_port(host, ssh_port);
1.109 djm 302: lowercase(hostport);
1.144 djm 303: if (hash_hosts && (hashed = host_hash(hostport, NULL, 0)) == NULL)
1.51 djm 304: fatal("host_hash failed");
1.108 djm 305: known_host = hash_hosts ? hashed : hostport;
1.103 djm 306: if (!get_cert)
1.108 djm 307: fprintf(stdout, "%s ", known_host);
1.95 markus 308: sshkey_write(key, stdout);
1.1 markus 309: fputs("\n", stdout);
1.140 dtucker 310: free(hashed);
1.101 djm 311: free(hostport);
1.102 djm 312: }
313:
314: static void
315: keyprint(con *c, struct sshkey *key)
316: {
317: char *hosts = c->c_output_name ? c->c_output_name : c->c_name;
318: char *host, *ohosts;
319:
320: if (key == NULL)
321: return;
1.103 djm 322: if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) {
1.102 djm 323: keyprint_one(hosts, key);
324: return;
325: }
326: ohosts = hosts = xstrdup(hosts);
327: while ((host = strsep(&hosts, ",")) != NULL)
328: keyprint_one(host, key);
329: free(ohosts);
1.1 markus 330: }
331:
1.24 itojun 332: static int
1.1 markus 333: tcpconnect(char *host)
334: {
335: struct addrinfo hints, *ai, *aitop;
336: char strport[NI_MAXSERV];
337: int gaierr, s = -1;
338:
1.26 markus 339: snprintf(strport, sizeof strport, "%d", ssh_port);
1.1 markus 340: memset(&hints, 0, sizeof(hints));
1.26 markus 341: hints.ai_family = IPv4or6;
1.1 markus 342: hints.ai_socktype = SOCK_STREAM;
1.97 djm 343: if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
344: error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
345: return -1;
346: }
1.1 markus 347: for (ai = aitop; ai; ai = ai->ai_next) {
1.81 dtucker 348: s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.128 deraadt 349: if (s == -1) {
1.1 markus 350: error("socket: %s", strerror(errno));
351: continue;
352: }
1.49 djm 353: if (set_nonblock(s) == -1)
1.136 djm 354: fatal_f("set_nonblock(%d)", s);
1.128 deraadt 355: if (connect(s, ai->ai_addr, ai->ai_addrlen) == -1 &&
1.1 markus 356: errno != EINPROGRESS)
357: error("connect (`%s'): %s", host, strerror(errno));
358: else
359: break;
360: close(s);
361: s = -1;
362: }
363: freeaddrinfo(aitop);
364: return s;
365: }
366:
1.24 itojun 367: static int
1.147 djm 368: conalloc(const char *iname, const char *oname, int keytype)
1.1 markus 369: {
1.39 deraadt 370: char *namebase, *name, *namelist;
1.1 markus 371: int s;
372:
373: namebase = namelist = xstrdup(iname);
374:
375: do {
376: name = xstrsep(&namelist, ",");
377: if (!name) {
1.87 djm 378: free(namebase);
1.1 markus 379: return (-1);
380: }
381: } while ((s = tcpconnect(name)) < 0);
382:
383: if (s >= maxfd)
1.4 markus 384: fatal("conalloc: fdno %d too high", s);
1.1 markus 385: if (fdcon[s].c_status)
1.4 markus 386: fatal("conalloc: attempt to reuse fdno %d", s);
1.1 markus 387:
1.136 djm 388: debug3_f("oname %s kt %d", oname, keytype);
1.1 markus 389: fdcon[s].c_fd = s;
390: fdcon[s].c_status = CS_CON;
391: fdcon[s].c_namebase = namebase;
392: fdcon[s].c_name = name;
393: fdcon[s].c_namelist = namelist;
394: fdcon[s].c_output_name = xstrdup(oname);
395: fdcon[s].c_data = (char *) &fdcon[s].c_plen;
396: fdcon[s].c_len = 4;
397: fdcon[s].c_off = 0;
1.26 markus 398: fdcon[s].c_keytype = keytype;
1.141 deraadt 399: monotime_ts(&fdcon[s].c_ts);
400: fdcon[s].c_ts.tv_sec += timeout;
1.1 markus 401: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
1.141 deraadt 402: read_wait[s].fd = s;
403: read_wait[s].events = POLLIN;
1.1 markus 404: ncon++;
405: return (s);
406: }
407:
1.24 itojun 408: static void
1.1 markus 409: confree(int s)
410: {
411: if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
1.4 markus 412: fatal("confree: attempt to free bad fdno %d", s);
1.87 djm 413: free(fdcon[s].c_namebase);
414: free(fdcon[s].c_output_name);
1.1 markus 415: if (fdcon[s].c_status == CS_KEYS)
1.87 djm 416: free(fdcon[s].c_data);
1.1 markus 417: fdcon[s].c_status = CS_UNUSED;
1.26 markus 418: fdcon[s].c_keytype = 0;
1.95 markus 419: if (fdcon[s].c_ssh) {
420: ssh_packet_close(fdcon[s].c_ssh);
421: free(fdcon[s].c_ssh);
422: fdcon[s].c_ssh = NULL;
1.115 dtucker 423: } else
424: close(s);
1.1 markus 425: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
1.141 deraadt 426: read_wait[s].fd = -1;
427: read_wait[s].events = 0;
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);
1.141 deraadt 435: monotime_ts(&fdcon[s].c_ts);
436: fdcon[s].c_ts.tv_sec += timeout;
1.1 markus 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:
1.112 djm 460: /* send client banner */
461: n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
462: PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2);
463: if (n < 0 || (size_t)n >= sizeof(buf)) {
464: error("snprintf: buffer too small");
465: confree(s);
466: return;
467: }
468: if (atomicio(vwrite, s, buf, n) != (size_t)n) {
469: error("write (%s): %s", c->c_name, strerror(errno));
470: confree(s);
471: return;
472: }
473:
1.146 dtucker 474: /*
475: * Read the server banner as per RFC4253 section 4.2. The "SSH-"
1.149 ! jmc 476: * protocol identification string may be preceeded by an arbitrarily
1.146 dtucker 477: * large banner which we must read and ignore. Loop while reading
478: * newline-terminated lines until we have one starting with "SSH-".
479: * The ID string cannot be longer than 255 characters although the
480: * preceeding banner lines may (in which case they'll be discarded
481: * in multiple iterations of the outer loop).
482: */
1.57 djm 483: for (;;) {
484: memset(buf, '\0', sizeof(buf));
485: bufsiz = sizeof(buf);
486: cp = buf;
487: while (bufsiz-- &&
488: (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
489: if (*cp == '\r')
490: *cp = '\n';
491: cp++;
492: }
493: if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
494: break;
1.27 markus 495: }
1.54 avsm 496: if (n == 0) {
497: switch (errno) {
498: case EPIPE:
499: error("%s: Connection closed by remote host", c->c_name);
500: break;
501: case ECONNREFUSED:
502: break;
503: default:
1.1 markus 504: error("read (%s): %s", c->c_name, strerror(errno));
1.54 avsm 505: break;
506: }
1.1 markus 507: conrecycle(s);
1.146 dtucker 508: return;
509: }
510: if (cp >= buf + sizeof(buf)) {
511: error("%s: greeting exceeds allowable length", c->c_name);
512: confree(s);
1.1 markus 513: return;
514: }
1.21 millert 515: if (*cp != '\n' && *cp != '\r') {
1.1 markus 516: error("%s: bad greeting", c->c_name);
517: confree(s);
518: return;
519: }
1.21 millert 520: *cp = '\0';
1.98 djm 521: if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL)
522: fatal("ssh_packet_set_connection failed");
1.99 djm 523: ssh_packet_set_timeout(c->c_ssh, timeout, 1);
1.95 markus 524: ssh_set_app_data(c->c_ssh, c); /* back link */
1.139 djm 525: c->c_ssh->compat = 0;
1.33 markus 526: if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
527: &remote_major, &remote_minor, remote_version) == 3)
1.139 djm 528: compat_banner(c->c_ssh, remote_version);
1.112 djm 529: if (!ssh2_capable(remote_major, remote_minor)) {
530: debug("%s doesn't support ssh2", c->c_name);
1.33 markus 531: confree(s);
532: return;
1.26 markus 533: }
1.117 djm 534: fprintf(stderr, "%c %s:%d %s\n", print_sshfp ? ';' : '#',
535: c->c_name, ssh_port, chop(buf));
1.112 djm 536: keygrab_ssh2(c);
537: confree(s);
1.1 markus 538: }
539:
1.24 itojun 540: static void
1.1 markus 541: conread(int s)
542: {
1.39 deraadt 543: con *c = &fdcon[s];
1.54 avsm 544: size_t n;
1.1 markus 545:
546: if (c->c_status == CS_CON) {
547: congreet(s);
548: return;
549: }
1.50 avsm 550: n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
1.54 avsm 551: if (n == 0) {
1.1 markus 552: error("read (%s): %s", c->c_name, strerror(errno));
553: confree(s);
554: return;
555: }
556: c->c_off += n;
557:
558: if (c->c_off == c->c_len)
559: switch (c->c_status) {
560: case CS_SIZE:
561: c->c_plen = htonl(c->c_plen);
562: c->c_len = c->c_plen + 8 - (c->c_plen & 7);
563: c->c_off = 0;
564: c->c_data = xmalloc(c->c_len);
565: c->c_status = CS_KEYS;
566: break;
567: default:
1.4 markus 568: fatal("conread: invalid status %d", c->c_status);
1.1 markus 569: break;
570: }
571:
572: contouch(s);
573: }
574:
1.24 itojun 575: static void
1.1 markus 576: conloop(void)
577: {
1.141 deraadt 578: struct timespec seltime, now;
1.39 deraadt 579: con *c;
1.1 markus 580: int i;
581:
1.141 deraadt 582: monotime_ts(&now);
1.36 itojun 583: c = TAILQ_FIRST(&tq);
1.1 markus 584:
1.141 deraadt 585: if (c && timespeccmp(&c->c_ts, &now, >))
586: timespecsub(&c->c_ts, &now, &seltime);
1.132 cheloha 587: else
1.141 deraadt 588: timespecclear(&seltime);
1.1 markus 589:
1.145 deraadt 590: while (ppoll(read_wait, maxfd, &seltime, NULL) == -1) {
591: if (errno == EAGAIN || errno == EINTR)
592: continue;
593: error("poll error");
594: }
1.16 deraadt 595:
1.18 deraadt 596: for (i = 0; i < maxfd; i++) {
1.141 deraadt 597: if (read_wait[i].revents & (POLLHUP|POLLERR|POLLNVAL))
1.1 markus 598: confree(i);
1.143 djm 599: else if (read_wait[i].revents & (POLLIN|POLLHUP))
1.1 markus 600: conread(i);
1.18 deraadt 601: }
1.1 markus 602:
1.36 itojun 603: c = TAILQ_FIRST(&tq);
1.141 deraadt 604: while (c && timespeccmp(&c->c_ts, &now, <)) {
1.1 markus 605: int s = c->c_fd;
1.18 deraadt 606:
1.36 itojun 607: c = TAILQ_NEXT(c, c_link);
1.1 markus 608: conrecycle(s);
609: }
610: }
611:
1.26 markus 612: static void
1.147 djm 613: do_one_host(char *host)
1.1 markus 614: {
1.26 markus 615: char *name = strnnsep(&host, " \t\n");
616: int j;
1.1 markus 617:
1.31 markus 618: if (name == NULL)
619: return;
1.112 djm 620: for (j = KT_MIN; j <= KT_MAX; j *= 2) {
1.26 markus 621: if (get_keytypes & j) {
622: while (ncon >= MAXCON)
623: conloop();
624: conalloc(name, *host ? host : name, j);
1.1 markus 625: }
1.147 djm 626: }
627: }
628:
629: static void
630: do_host(char *host)
631: {
632: char daddr[128];
633: struct xaddr addr, end_addr;
634: u_int masklen;
635:
636: if (host == NULL)
637: return;
638: if (addr_pton_cidr(host, &addr, &masklen) != 0) {
639: /* Assume argument is a hostname */
640: do_one_host(host);
641: } else {
642: /* Argument is a CIDR range */
643: debug("CIDR range %s", host);
644: end_addr = addr;
645: if (addr_host_to_all1s(&end_addr, masklen) != 0)
646: goto badaddr;
647: /*
648: * Note: we deliberately include the all-zero/ones addresses.
649: */
650: for (;;) {
651: if (addr_ntop(&addr, daddr, sizeof(daddr)) != 0) {
652: badaddr:
653: error("Invalid address %s", host);
654: return;
655: }
656: debug("CIDR expand: address %s", daddr);
657: do_one_host(daddr);
658: if (addr_cmp(&addr, &end_addr) == 0)
659: break;
660: addr_increment(&addr);
661: };
1.1 markus 662: }
663: }
664:
1.34 markus 665: void
1.134 djm 666: sshfatal(const char *file, const char *func, int line, int showfunc,
1.135 djm 667: LogLevel level, const char *suffix, const char *fmt, ...)
1.26 markus 668: {
1.34 markus 669: va_list args;
1.39 deraadt 670:
1.34 markus 671: va_start(args, fmt);
1.137 djm 672: sshlogv(file, func, line, showfunc, level, suffix, fmt, args);
1.34 markus 673: va_end(args);
1.133 djm 674: cleanup_exit(255);
1.26 markus 675: }
676:
677: static void
1.1 markus 678: usage(void)
679: {
1.77 sobrado 680: fprintf(stderr,
1.117 djm 681: "usage: %s [-46cDHv] [-f file] [-p port] [-T timeout] [-t type]\n"
1.119 jmc 682: "\t\t [host | addrlist namelist]\n",
1.25 jakob 683: __progname);
684: exit(1);
1.1 markus 685: }
686:
687: int
688: main(int argc, char **argv)
689: {
1.26 markus 690: int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
1.82 djm 691: int opt, fopt_count = 0, j;
1.120 markus 692: char *tname, *cp, *line = NULL;
693: size_t linesize = 0;
1.82 djm 694: FILE *fp;
1.26 markus 695:
696: extern int optind;
697: extern char *optarg;
1.1 markus 698:
699: TAILQ_INIT(&tq);
1.56 djm 700:
701: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
702: sanitise_stdfd();
1.1 markus 703:
1.26 markus 704: if (argc <= 1)
1.1 markus 705: usage();
706:
1.117 djm 707: while ((opt = getopt(argc, argv, "cDHv46p:T:t:f:")) != -1) {
1.26 markus 708: switch (opt) {
1.51 djm 709: case 'H':
710: hash_hosts = 1;
1.103 djm 711: break;
712: case 'c':
713: get_cert = 1;
1.117 djm 714: break;
715: case 'D':
716: print_sshfp = 1;
1.51 djm 717: break;
1.26 markus 718: case 'p':
719: ssh_port = a2port(optarg);
1.78 djm 720: if (ssh_port <= 0) {
1.26 markus 721: fprintf(stderr, "Bad port '%s'\n", optarg);
722: exit(1);
723: }
724: break;
725: case 'T':
1.38 stevesk 726: timeout = convtime(optarg);
727: if (timeout == -1 || timeout == 0) {
728: fprintf(stderr, "Bad timeout '%s'\n", optarg);
1.1 markus 729: usage();
1.38 stevesk 730: }
1.26 markus 731: break;
732: case 'v':
733: if (!debug_flag) {
734: debug_flag = 1;
735: log_level = SYSLOG_LEVEL_DEBUG1;
736: }
737: else if (log_level < SYSLOG_LEVEL_DEBUG3)
738: log_level++;
739: else
740: fatal("Too high debugging level.");
741: break;
742: case 'f':
743: if (strcmp(optarg, "-") == 0)
744: optarg = NULL;
745: argv[fopt_count++] = optarg;
746: break;
747: case 't':
748: get_keytypes = 0;
749: tname = strtok(optarg, ",");
750: while (tname) {
1.95 markus 751: int type = sshkey_type_from_name(tname);
1.107 djm 752:
1.26 markus 753: switch (type) {
754: case KEY_DSA:
755: get_keytypes |= KT_DSA;
1.83 djm 756: break;
757: case KEY_ECDSA:
758: get_keytypes |= KT_ECDSA;
1.26 markus 759: break;
760: case KEY_RSA:
761: get_keytypes |= KT_RSA;
1.89 markus 762: break;
763: case KEY_ED25519:
764: get_keytypes |= KT_ED25519;
1.118 markus 765: break;
766: case KEY_XMSS:
767: get_keytypes |= KT_XMSS;
1.131 djm 768: break;
769: case KEY_ED25519_SK:
770: get_keytypes |= KT_ED25519_SK;
771: break;
772: case KEY_ECDSA_SK:
773: get_keytypes |= KT_ECDSA_SK;
1.26 markus 774: break;
775: case KEY_UNSPEC:
1.107 djm 776: default:
777: fatal("Unknown key type \"%s\"", tname);
1.26 markus 778: }
779: tname = strtok(NULL, ",");
780: }
781: break;
782: case '4':
783: IPv4or6 = AF_INET;
784: break;
785: case '6':
786: IPv4or6 = AF_INET6;
787: break;
788: default:
789: usage();
1.1 markus 790: }
791: }
1.26 markus 792: if (optind == argc && !fopt_count)
1.1 markus 793: usage();
794:
1.26 markus 795: log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
796:
1.1 markus 797: maxfd = fdlim_get(1);
798: if (maxfd < 0)
1.4 markus 799: fatal("%s: fdlim_get: bad value", __progname);
1.1 markus 800: if (maxfd > MAXMAXFD)
801: maxfd = MAXMAXFD;
1.18 deraadt 802: if (MAXCON <= 0)
1.4 markus 803: fatal("%s: not enough file descriptors", __progname);
1.1 markus 804: if (maxfd > fdlim_get(0))
805: fdlim_set(maxfd);
1.63 djm 806: fdcon = xcalloc(maxfd, sizeof(con));
1.141 deraadt 807: read_wait = xcalloc(maxfd, sizeof(struct pollfd));
1.142 deraadt 808: for (j = 0; j < maxfd; j++)
809: read_wait[j].fd = -1;
1.1 markus 810:
1.82 djm 811: for (j = 0; j < fopt_count; j++) {
812: if (argv[j] == NULL)
813: fp = stdin;
814: else if ((fp = fopen(argv[j], "r")) == NULL)
1.136 djm 815: fatal("%s: %s: %s", __progname, argv[j], strerror(errno));
1.82 djm 816:
1.120 markus 817: while (getline(&line, &linesize, fp) != -1) {
1.82 djm 818: /* Chomp off trailing whitespace and comments */
819: if ((cp = strchr(line, '#')) == NULL)
820: cp = line + strlen(line) - 1;
821: while (cp >= line) {
822: if (*cp == ' ' || *cp == '\t' ||
823: *cp == '\n' || *cp == '#')
824: *cp-- = '\0';
825: else
826: break;
827: }
828:
829: /* Skip empty lines */
830: if (*line == '\0')
1.28 danh 831: continue;
1.82 djm 832:
833: do_host(line);
1.26 markus 834: }
1.82 djm 835:
836: if (ferror(fp))
1.136 djm 837: fatal("%s: %s: %s", __progname, argv[j], strerror(errno));
1.82 djm 838:
839: fclose(fp);
1.26 markus 840: }
1.120 markus 841: free(line);
1.26 markus 842:
843: while (optind < argc)
844: do_host(argv[optind++]);
1.1 markus 845:
846: while (ncon > 0)
847: conloop();
848:
1.126 djm 849: return found_one ? 0 : 1;
1.1 markus 850: }
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