Annotation of src/usr.bin/ssh/ssh-keyscan.c, Revision 1.156
1.156 ! tobias 1: /* $OpenBSD: ssh-keyscan.c,v 1.155 2024/01/11 01:45:36 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>
1.153 djm 21: #include <limits.h>
1.67 stevesk 22: #include <netdb.h>
1.66 stevesk 23: #include <stdarg.h>
1.72 stevesk 24: #include <stdio.h>
1.71 stevesk 25: #include <stdlib.h>
1.141 deraadt 26: #include <poll.h>
1.73 deraadt 27: #include <signal.h>
1.69 stevesk 28: #include <string.h>
1.68 stevesk 29: #include <unistd.h>
1.1 markus 30:
31: #include "xmalloc.h"
32: #include "ssh.h"
1.95 markus 33: #include "sshbuf.h"
34: #include "sshkey.h"
1.73 deraadt 35: #include "cipher.h"
1.150 djm 36: #include "digest.h"
1.26 markus 37: #include "kex.h"
38: #include "compat.h"
39: #include "myproposal.h"
40: #include "packet.h"
41: #include "dispatch.h"
1.11 markus 42: #include "log.h"
1.18 deraadt 43: #include "atomicio.h"
1.26 markus 44: #include "misc.h"
1.51 djm 45: #include "hostfile.h"
1.95 markus 46: #include "ssherr.h"
47: #include "ssh_api.h"
1.117 djm 48: #include "dns.h"
1.147 djm 49: #include "addr.h"
1.1 markus 50:
1.26 markus 51: /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
52: Default value is AF_UNSPEC means both IPv4 and IPv6. */
53: int IPv4or6 = AF_UNSPEC;
54:
55: int ssh_port = SSH_DEFAULT_PORT;
1.1 markus 56:
1.112 djm 57: #define KT_DSA (1)
58: #define KT_RSA (1<<1)
59: #define KT_ECDSA (1<<2)
60: #define KT_ED25519 (1<<3)
1.118 markus 61: #define KT_XMSS (1<<4)
1.131 djm 62: #define KT_ECDSA_SK (1<<5)
63: #define KT_ED25519_SK (1<<6)
1.112 djm 64:
65: #define KT_MIN KT_DSA
1.131 djm 66: #define KT_MAX KT_ED25519_SK
1.26 markus 67:
1.103 djm 68: int get_cert = 0;
1.131 djm 69: int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519|KT_ECDSA_SK|KT_ED25519_SK;
1.1 markus 70:
1.51 djm 71: int hash_hosts = 0; /* Hash hostname on output */
72:
1.117 djm 73: int print_sshfp = 0; /* Print SSHFP records instead of known_hosts */
74:
1.126 djm 75: int found_one = 0; /* Successfully found a key */
76:
1.150 djm 77: int hashalg = -1; /* Hash for SSHFP records or -1 for all */
78:
1.1 markus 79: #define MAXMAXFD 256
80:
81: /* The number of seconds after which to give up on a TCP connection */
82: int timeout = 5;
83:
84: int maxfd;
1.18 deraadt 85: #define MAXCON (maxfd - 10)
1.1 markus 86:
1.3 markus 87: extern char *__progname;
1.141 deraadt 88: struct pollfd *read_wait;
1.1 markus 89: int ncon;
90:
91: /*
92: * Keep a connection structure for each file descriptor. The state
93: * associated with file descriptor n is held in fdcon[n].
94: */
95: typedef struct Connection {
1.6 markus 96: u_char c_status; /* State of connection on this file desc. */
1.1 markus 97: #define CS_UNUSED 0 /* File descriptor unused */
98: #define CS_CON 1 /* Waiting to connect/read greeting */
99: #define CS_SIZE 2 /* Waiting to read initial packet size */
100: #define CS_KEYS 3 /* Waiting to read public key packet */
101: int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
102: int c_plen; /* Packet length field for ssh packet */
103: int c_len; /* Total bytes which must be read. */
104: int c_off; /* Length of data read so far. */
1.112 djm 105: int c_keytype; /* Only one of KT_* */
1.100 miod 106: sig_atomic_t c_done; /* SSH2 done */
1.1 markus 107: char *c_namebase; /* Address to free for c_name and c_namelist */
108: char *c_name; /* Hostname of connection for errors */
109: char *c_namelist; /* Pointer to other possible addresses */
110: char *c_output_name; /* Hostname of connection for output */
111: char *c_data; /* Data read from this fd */
1.95 markus 112: struct ssh *c_ssh; /* SSH-connection */
1.141 deraadt 113: struct timespec c_ts; /* Time at which connection gets aborted */
1.1 markus 114: TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
115: } con;
116:
117: TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
118: con *fdcon;
119:
1.95 markus 120: static void keyprint(con *c, struct sshkey *key);
121:
1.24 itojun 122: static int
1.1 markus 123: fdlim_get(int hard)
124: {
125: struct rlimit rlfd;
1.17 deraadt 126:
1.128 deraadt 127: if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1)
1.1 markus 128: return (-1);
1.153 djm 129: if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY ||
130: (hard ? rlfd.rlim_max : rlfd.rlim_cur) > INT_MAX)
1.46 djm 131: return sysconf(_SC_OPEN_MAX);
1.153 djm 132: return hard ? rlfd.rlim_max : rlfd.rlim_cur;
1.1 markus 133: }
134:
1.24 itojun 135: static int
1.1 markus 136: fdlim_set(int lim)
137: {
138: struct rlimit rlfd;
1.39 deraadt 139:
1.1 markus 140: if (lim <= 0)
141: return (-1);
1.128 deraadt 142: if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1)
1.1 markus 143: return (-1);
144: rlfd.rlim_cur = lim;
1.128 deraadt 145: if (setrlimit(RLIMIT_NOFILE, &rlfd) == -1)
1.1 markus 146: return (-1);
147: return (0);
148: }
149:
150: /*
151: * This is an strsep function that returns a null field for adjacent
152: * separators. This is the same as the 4.4BSD strsep, but different from the
153: * one in the GNU libc.
154: */
1.24 itojun 155: static char *
1.1 markus 156: xstrsep(char **str, const char *delim)
157: {
158: char *s, *e;
159:
160: if (!**str)
161: return (NULL);
162:
163: s = *str;
164: e = s + strcspn(s, delim);
165:
166: if (*e != '\0')
167: *e++ = '\0';
168: *str = e;
169:
170: return (s);
171: }
172:
173: /*
174: * Get the next non-null token (like GNU strsep). Strsep() will return a
175: * null token for two adjacent separators, so we may have to loop.
176: */
1.24 itojun 177: static char *
1.1 markus 178: strnnsep(char **stringp, char *delim)
179: {
180: char *tok;
181:
182: do {
183: tok = xstrsep(stringp, delim);
184: } while (tok && *tok == '\0');
185: return (tok);
186: }
187:
1.26 markus 188:
189: static int
1.95 markus 190: key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh)
1.26 markus 191: {
1.95 markus 192: con *c;
193:
194: if ((c = ssh_get_app_data(ssh)) != NULL)
195: keyprint(c, hostkey);
196: /* always abort key exchange */
197: return -1;
1.26 markus 198: }
199:
200: static int
201: ssh2_capable(int remote_major, int remote_minor)
202: {
203: switch (remote_major) {
204: case 1:
205: if (remote_minor == 99)
206: return 1;
207: break;
208: case 2:
209: return 1;
210: default:
211: break;
212: }
213: return 0;
214: }
215:
1.95 markus 216: static void
1.26 markus 217: keygrab_ssh2(con *c)
218: {
1.91 markus 219: char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
1.95 markus 220: int r;
1.26 markus 221:
1.103 djm 222: switch (c->c_keytype) {
223: case KT_DSA:
224: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
225: "ssh-dss-cert-v01@openssh.com" : "ssh-dss";
226: break;
227: case KT_RSA:
228: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
1.129 djm 229: "rsa-sha2-512-cert-v01@openssh.com,"
230: "rsa-sha2-256-cert-v01@openssh.com,"
231: "ssh-rsa-cert-v01@openssh.com" :
232: "rsa-sha2-512,"
233: "rsa-sha2-256,"
234: "ssh-rsa";
1.103 djm 235: break;
236: case KT_ED25519:
237: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
238: "ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519";
239: break;
1.118 markus 240: case KT_XMSS:
241: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
242: "ssh-xmss-cert-v01@openssh.com" : "ssh-xmss@openssh.com";
243: break;
1.103 djm 244: case KT_ECDSA:
245: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
246: "ecdsa-sha2-nistp256-cert-v01@openssh.com,"
247: "ecdsa-sha2-nistp384-cert-v01@openssh.com,"
248: "ecdsa-sha2-nistp521-cert-v01@openssh.com" :
249: "ecdsa-sha2-nistp256,"
250: "ecdsa-sha2-nistp384,"
251: "ecdsa-sha2-nistp521";
252: break;
1.131 djm 253: case KT_ECDSA_SK:
254: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
255: "sk-ecdsa-sha2-nistp256-cert-v01@openssh.com" :
256: "sk-ecdsa-sha2-nistp256@openssh.com";
257: break;
258: case KT_ED25519_SK:
259: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
260: "sk-ssh-ed25519-cert-v01@openssh.com" :
261: "sk-ssh-ed25519@openssh.com";
262: break;
1.103 djm 263: default:
264: fatal("unknown key type %d", c->c_keytype);
265: break;
266: }
1.95 markus 267: if ((r = kex_setup(c->c_ssh, myproposal)) != 0) {
268: free(c->c_ssh);
269: fprintf(stderr, "kex_setup: %s\n", ssh_err(r));
270: exit(1);
271: }
1.92 markus 272: #ifdef WITH_OPENSSL
1.125 djm 273: c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_client;
274: c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_client;
275: c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_client;
276: c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_client;
277: c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_client;
1.95 markus 278: c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
279: c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
1.125 djm 280: c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kex_gen_client;
1.92 markus 281: #endif
1.125 djm 282: c->c_ssh->kex->kex[KEX_C25519_SHA256] = kex_gen_client;
1.138 djm 283: c->c_ssh->kex->kex[KEX_KEM_SNTRUP761X25519_SHA512] = kex_gen_client;
1.95 markus 284: ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper);
285: /*
286: * do the key-exchange until an error occurs or until
287: * the key_print_wrapper() callback sets c_done.
288: */
1.114 markus 289: ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done);
1.26 markus 290: }
291:
292: static void
1.108 djm 293: keyprint_one(const char *host, struct sshkey *key)
1.26 markus 294: {
1.140 dtucker 295: char *hostport = NULL, *hashed = NULL;
296: const char *known_host;
1.152 djm 297: int r = 0;
1.51 djm 298:
1.126 djm 299: found_one = 1;
300:
1.117 djm 301: if (print_sshfp) {
1.150 djm 302: export_dns_rr(host, key, stdout, 0, hashalg);
1.117 djm 303: return;
304: }
305:
1.108 djm 306: hostport = put_host_port(host, ssh_port);
1.109 djm 307: lowercase(hostport);
1.144 djm 308: if (hash_hosts && (hashed = host_hash(hostport, NULL, 0)) == NULL)
1.51 djm 309: fatal("host_hash failed");
1.108 djm 310: known_host = hash_hosts ? hashed : hostport;
1.103 djm 311: if (!get_cert)
1.152 djm 312: r = fprintf(stdout, "%s ", known_host);
313: if (r >= 0 && sshkey_write(key, stdout) == 0)
314: (void)fputs("\n", stdout);
1.140 dtucker 315: free(hashed);
1.101 djm 316: free(hostport);
1.102 djm 317: }
318:
319: static void
320: keyprint(con *c, struct sshkey *key)
321: {
322: char *hosts = c->c_output_name ? c->c_output_name : c->c_name;
323: char *host, *ohosts;
324:
325: if (key == NULL)
326: return;
1.103 djm 327: if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) {
1.102 djm 328: keyprint_one(hosts, key);
329: return;
330: }
331: ohosts = hosts = xstrdup(hosts);
332: while ((host = strsep(&hosts, ",")) != NULL)
333: keyprint_one(host, key);
334: free(ohosts);
1.1 markus 335: }
336:
1.24 itojun 337: static int
1.1 markus 338: tcpconnect(char *host)
339: {
340: struct addrinfo hints, *ai, *aitop;
341: char strport[NI_MAXSERV];
342: int gaierr, s = -1;
343:
1.26 markus 344: snprintf(strport, sizeof strport, "%d", ssh_port);
1.1 markus 345: memset(&hints, 0, sizeof(hints));
1.26 markus 346: hints.ai_family = IPv4or6;
1.1 markus 347: hints.ai_socktype = SOCK_STREAM;
1.97 djm 348: if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
349: error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
350: return -1;
351: }
1.1 markus 352: for (ai = aitop; ai; ai = ai->ai_next) {
1.81 dtucker 353: s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.128 deraadt 354: if (s == -1) {
1.1 markus 355: error("socket: %s", strerror(errno));
356: continue;
357: }
1.49 djm 358: if (set_nonblock(s) == -1)
1.136 djm 359: fatal_f("set_nonblock(%d)", s);
1.128 deraadt 360: if (connect(s, ai->ai_addr, ai->ai_addrlen) == -1 &&
1.1 markus 361: errno != EINPROGRESS)
362: error("connect (`%s'): %s", host, strerror(errno));
363: else
364: break;
365: close(s);
366: s = -1;
367: }
368: freeaddrinfo(aitop);
369: return s;
370: }
371:
1.24 itojun 372: static int
1.147 djm 373: conalloc(const char *iname, const char *oname, int keytype)
1.1 markus 374: {
1.39 deraadt 375: char *namebase, *name, *namelist;
1.1 markus 376: int s;
377:
378: namebase = namelist = xstrdup(iname);
379:
380: do {
381: name = xstrsep(&namelist, ",");
382: if (!name) {
1.87 djm 383: free(namebase);
1.1 markus 384: return (-1);
385: }
386: } while ((s = tcpconnect(name)) < 0);
387:
388: if (s >= maxfd)
1.4 markus 389: fatal("conalloc: fdno %d too high", s);
1.1 markus 390: if (fdcon[s].c_status)
1.4 markus 391: fatal("conalloc: attempt to reuse fdno %d", s);
1.1 markus 392:
1.136 djm 393: debug3_f("oname %s kt %d", oname, keytype);
1.1 markus 394: fdcon[s].c_fd = s;
395: fdcon[s].c_status = CS_CON;
396: fdcon[s].c_namebase = namebase;
397: fdcon[s].c_name = name;
398: fdcon[s].c_namelist = namelist;
399: fdcon[s].c_output_name = xstrdup(oname);
400: fdcon[s].c_data = (char *) &fdcon[s].c_plen;
401: fdcon[s].c_len = 4;
402: fdcon[s].c_off = 0;
1.26 markus 403: fdcon[s].c_keytype = keytype;
1.141 deraadt 404: monotime_ts(&fdcon[s].c_ts);
405: fdcon[s].c_ts.tv_sec += timeout;
1.1 markus 406: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
1.141 deraadt 407: read_wait[s].fd = s;
408: read_wait[s].events = POLLIN;
1.1 markus 409: ncon++;
410: return (s);
411: }
412:
1.24 itojun 413: static void
1.1 markus 414: confree(int s)
415: {
416: if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
1.4 markus 417: fatal("confree: attempt to free bad fdno %d", s);
1.87 djm 418: free(fdcon[s].c_namebase);
419: free(fdcon[s].c_output_name);
1.1 markus 420: if (fdcon[s].c_status == CS_KEYS)
1.87 djm 421: free(fdcon[s].c_data);
1.1 markus 422: fdcon[s].c_status = CS_UNUSED;
1.26 markus 423: fdcon[s].c_keytype = 0;
1.95 markus 424: if (fdcon[s].c_ssh) {
425: ssh_packet_close(fdcon[s].c_ssh);
426: free(fdcon[s].c_ssh);
427: fdcon[s].c_ssh = NULL;
1.115 dtucker 428: } else
429: close(s);
1.1 markus 430: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
1.141 deraadt 431: read_wait[s].fd = -1;
432: read_wait[s].events = 0;
1.1 markus 433: ncon--;
434: }
435:
1.24 itojun 436: static void
1.1 markus 437: contouch(int s)
438: {
439: TAILQ_REMOVE(&tq, &fdcon[s], c_link);
1.141 deraadt 440: monotime_ts(&fdcon[s].c_ts);
441: fdcon[s].c_ts.tv_sec += timeout;
1.1 markus 442: TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
443: }
444:
1.24 itojun 445: static int
1.1 markus 446: conrecycle(int s)
447: {
1.39 deraadt 448: con *c = &fdcon[s];
1.1 markus 449: int ret;
450:
1.26 markus 451: ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
1.1 markus 452: confree(s);
453: return (ret);
454: }
455:
1.24 itojun 456: static void
1.1 markus 457: congreet(int s)
458: {
1.55 djm 459: int n = 0, remote_major = 0, remote_minor = 0;
1.26 markus 460: char buf[256], *cp;
1.33 markus 461: char remote_version[sizeof buf];
1.55 djm 462: size_t bufsiz;
1.1 markus 463: con *c = &fdcon[s];
464:
1.112 djm 465: /* send client banner */
466: n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
467: PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2);
468: if (n < 0 || (size_t)n >= sizeof(buf)) {
469: error("snprintf: buffer too small");
470: confree(s);
471: return;
472: }
473: if (atomicio(vwrite, s, buf, n) != (size_t)n) {
474: error("write (%s): %s", c->c_name, strerror(errno));
475: confree(s);
476: return;
477: }
478:
1.146 dtucker 479: /*
480: * Read the server banner as per RFC4253 section 4.2. The "SSH-"
1.154 jsg 481: * protocol identification string may be preceded by an arbitrarily
1.146 dtucker 482: * large banner which we must read and ignore. Loop while reading
483: * newline-terminated lines until we have one starting with "SSH-".
484: * The ID string cannot be longer than 255 characters although the
1.154 jsg 485: * preceding banner lines may (in which case they'll be discarded
1.146 dtucker 486: * in multiple iterations of the outer loop).
487: */
1.57 djm 488: for (;;) {
489: memset(buf, '\0', sizeof(buf));
490: bufsiz = sizeof(buf);
491: cp = buf;
492: while (bufsiz-- &&
493: (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
494: if (*cp == '\r')
495: *cp = '\n';
496: cp++;
497: }
498: if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
499: break;
1.27 markus 500: }
1.54 avsm 501: if (n == 0) {
502: switch (errno) {
503: case EPIPE:
504: error("%s: Connection closed by remote host", c->c_name);
505: break;
506: case ECONNREFUSED:
507: break;
508: default:
1.1 markus 509: error("read (%s): %s", c->c_name, strerror(errno));
1.54 avsm 510: break;
511: }
1.1 markus 512: conrecycle(s);
1.146 dtucker 513: return;
514: }
515: if (cp >= buf + sizeof(buf)) {
516: error("%s: greeting exceeds allowable length", c->c_name);
517: confree(s);
1.1 markus 518: return;
519: }
1.21 millert 520: if (*cp != '\n' && *cp != '\r') {
1.1 markus 521: error("%s: bad greeting", c->c_name);
522: confree(s);
523: return;
524: }
1.21 millert 525: *cp = '\0';
1.98 djm 526: if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL)
527: fatal("ssh_packet_set_connection failed");
1.99 djm 528: ssh_packet_set_timeout(c->c_ssh, timeout, 1);
1.95 markus 529: ssh_set_app_data(c->c_ssh, c); /* back link */
1.139 djm 530: c->c_ssh->compat = 0;
1.33 markus 531: if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
532: &remote_major, &remote_minor, remote_version) == 3)
1.139 djm 533: compat_banner(c->c_ssh, remote_version);
1.112 djm 534: if (!ssh2_capable(remote_major, remote_minor)) {
535: debug("%s doesn't support ssh2", c->c_name);
1.33 markus 536: confree(s);
537: return;
1.26 markus 538: }
1.117 djm 539: fprintf(stderr, "%c %s:%d %s\n", print_sshfp ? ';' : '#',
540: c->c_name, ssh_port, chop(buf));
1.112 djm 541: keygrab_ssh2(c);
542: confree(s);
1.1 markus 543: }
544:
1.24 itojun 545: static void
1.1 markus 546: conread(int s)
547: {
1.39 deraadt 548: con *c = &fdcon[s];
1.54 avsm 549: size_t n;
1.1 markus 550:
551: if (c->c_status == CS_CON) {
552: congreet(s);
553: return;
554: }
1.50 avsm 555: n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
1.54 avsm 556: if (n == 0) {
1.1 markus 557: error("read (%s): %s", c->c_name, strerror(errno));
558: confree(s);
559: return;
560: }
561: c->c_off += n;
562:
563: if (c->c_off == c->c_len)
564: switch (c->c_status) {
565: case CS_SIZE:
566: c->c_plen = htonl(c->c_plen);
567: c->c_len = c->c_plen + 8 - (c->c_plen & 7);
568: c->c_off = 0;
569: c->c_data = xmalloc(c->c_len);
570: c->c_status = CS_KEYS;
571: break;
572: default:
1.4 markus 573: fatal("conread: invalid status %d", c->c_status);
1.1 markus 574: break;
575: }
576:
577: contouch(s);
578: }
579:
1.24 itojun 580: static void
1.1 markus 581: conloop(void)
582: {
1.141 deraadt 583: struct timespec seltime, now;
1.39 deraadt 584: con *c;
1.1 markus 585: int i;
586:
1.141 deraadt 587: monotime_ts(&now);
1.36 itojun 588: c = TAILQ_FIRST(&tq);
1.1 markus 589:
1.141 deraadt 590: if (c && timespeccmp(&c->c_ts, &now, >))
591: timespecsub(&c->c_ts, &now, &seltime);
1.132 cheloha 592: else
1.141 deraadt 593: timespecclear(&seltime);
1.1 markus 594:
1.145 deraadt 595: while (ppoll(read_wait, maxfd, &seltime, NULL) == -1) {
596: if (errno == EAGAIN || errno == EINTR)
597: continue;
598: error("poll error");
599: }
1.16 deraadt 600:
1.18 deraadt 601: for (i = 0; i < maxfd; i++) {
1.141 deraadt 602: if (read_wait[i].revents & (POLLHUP|POLLERR|POLLNVAL))
1.1 markus 603: confree(i);
1.143 djm 604: else if (read_wait[i].revents & (POLLIN|POLLHUP))
1.1 markus 605: conread(i);
1.18 deraadt 606: }
1.1 markus 607:
1.36 itojun 608: c = TAILQ_FIRST(&tq);
1.141 deraadt 609: while (c && timespeccmp(&c->c_ts, &now, <)) {
1.1 markus 610: int s = c->c_fd;
1.18 deraadt 611:
1.36 itojun 612: c = TAILQ_NEXT(c, c_link);
1.1 markus 613: conrecycle(s);
614: }
615: }
616:
1.26 markus 617: static void
1.147 djm 618: do_one_host(char *host)
1.1 markus 619: {
1.26 markus 620: char *name = strnnsep(&host, " \t\n");
621: int j;
1.1 markus 622:
1.31 markus 623: if (name == NULL)
624: return;
1.112 djm 625: for (j = KT_MIN; j <= KT_MAX; j *= 2) {
1.26 markus 626: if (get_keytypes & j) {
627: while (ncon >= MAXCON)
628: conloop();
629: conalloc(name, *host ? host : name, j);
1.1 markus 630: }
1.147 djm 631: }
632: }
633:
634: static void
635: do_host(char *host)
636: {
637: char daddr[128];
638: struct xaddr addr, end_addr;
639: u_int masklen;
640:
641: if (host == NULL)
642: return;
643: if (addr_pton_cidr(host, &addr, &masklen) != 0) {
644: /* Assume argument is a hostname */
645: do_one_host(host);
646: } else {
647: /* Argument is a CIDR range */
648: debug("CIDR range %s", host);
649: end_addr = addr;
650: if (addr_host_to_all1s(&end_addr, masklen) != 0)
651: goto badaddr;
652: /*
653: * Note: we deliberately include the all-zero/ones addresses.
654: */
655: for (;;) {
656: if (addr_ntop(&addr, daddr, sizeof(daddr)) != 0) {
657: badaddr:
658: error("Invalid address %s", host);
659: return;
660: }
661: debug("CIDR expand: address %s", daddr);
662: do_one_host(daddr);
663: if (addr_cmp(&addr, &end_addr) == 0)
664: break;
665: addr_increment(&addr);
666: };
1.1 markus 667: }
668: }
669:
1.34 markus 670: void
1.134 djm 671: sshfatal(const char *file, const char *func, int line, int showfunc,
1.135 djm 672: LogLevel level, const char *suffix, const char *fmt, ...)
1.26 markus 673: {
1.34 markus 674: va_list args;
1.39 deraadt 675:
1.34 markus 676: va_start(args, fmt);
1.137 djm 677: sshlogv(file, func, line, showfunc, level, suffix, fmt, args);
1.34 markus 678: va_end(args);
1.133 djm 679: cleanup_exit(255);
1.26 markus 680: }
681:
682: static void
1.1 markus 683: usage(void)
684: {
1.77 sobrado 685: fprintf(stderr,
1.151 jmc 686: "usage: ssh-keyscan [-46cDHv] [-f file] [-O option] [-p port] [-T timeout]\n"
687: " [-t type] [host | addrlist namelist]\n");
1.25 jakob 688: exit(1);
1.1 markus 689: }
690:
691: int
692: main(int argc, char **argv)
693: {
1.26 markus 694: int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
1.82 djm 695: int opt, fopt_count = 0, j;
1.120 markus 696: char *tname, *cp, *line = NULL;
697: size_t linesize = 0;
1.82 djm 698: FILE *fp;
1.26 markus 699:
700: extern int optind;
701: extern char *optarg;
1.1 markus 702:
703: TAILQ_INIT(&tq);
1.56 djm 704:
705: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
706: sanitise_stdfd();
1.1 markus 707:
1.26 markus 708: if (argc <= 1)
1.1 markus 709: usage();
710:
1.150 djm 711: while ((opt = getopt(argc, argv, "cDHv46O:p:T:t:f:")) != -1) {
1.26 markus 712: switch (opt) {
1.51 djm 713: case 'H':
714: hash_hosts = 1;
1.103 djm 715: break;
716: case 'c':
717: get_cert = 1;
1.117 djm 718: break;
719: case 'D':
720: print_sshfp = 1;
1.51 djm 721: break;
1.26 markus 722: case 'p':
723: ssh_port = a2port(optarg);
1.78 djm 724: if (ssh_port <= 0) {
1.26 markus 725: fprintf(stderr, "Bad port '%s'\n", optarg);
726: exit(1);
727: }
728: break;
729: case 'T':
1.38 stevesk 730: timeout = convtime(optarg);
731: if (timeout == -1 || timeout == 0) {
732: fprintf(stderr, "Bad timeout '%s'\n", optarg);
1.1 markus 733: usage();
1.38 stevesk 734: }
1.26 markus 735: break;
736: case 'v':
737: if (!debug_flag) {
738: debug_flag = 1;
739: log_level = SYSLOG_LEVEL_DEBUG1;
740: }
741: else if (log_level < SYSLOG_LEVEL_DEBUG3)
742: log_level++;
743: else
744: fatal("Too high debugging level.");
745: break;
746: case 'f':
747: if (strcmp(optarg, "-") == 0)
748: optarg = NULL;
749: argv[fopt_count++] = optarg;
1.150 djm 750: break;
751: case 'O':
752: /* Maybe other misc options in the future too */
753: if (strncmp(optarg, "hashalg=", 8) != 0)
754: fatal("Unsupported -O option");
755: if ((hashalg = ssh_digest_alg_by_name(
756: optarg + 8)) == -1)
757: fatal("Unsupported hash algorithm");
1.26 markus 758: break;
759: case 't':
760: get_keytypes = 0;
761: tname = strtok(optarg, ",");
762: while (tname) {
1.95 markus 763: int type = sshkey_type_from_name(tname);
1.107 djm 764:
1.26 markus 765: switch (type) {
1.155 djm 766: #ifdef WITH_DSA
1.26 markus 767: case KEY_DSA:
768: get_keytypes |= KT_DSA;
1.83 djm 769: break;
1.155 djm 770: #endif
1.83 djm 771: case KEY_ECDSA:
772: get_keytypes |= KT_ECDSA;
1.26 markus 773: break;
774: case KEY_RSA:
775: get_keytypes |= KT_RSA;
1.89 markus 776: break;
777: case KEY_ED25519:
778: get_keytypes |= KT_ED25519;
1.118 markus 779: break;
780: case KEY_XMSS:
781: get_keytypes |= KT_XMSS;
1.131 djm 782: break;
783: case KEY_ED25519_SK:
784: get_keytypes |= KT_ED25519_SK;
785: break;
786: case KEY_ECDSA_SK:
787: get_keytypes |= KT_ECDSA_SK;
1.26 markus 788: break;
789: case KEY_UNSPEC:
1.107 djm 790: default:
791: fatal("Unknown key type \"%s\"", tname);
1.26 markus 792: }
793: tname = strtok(NULL, ",");
794: }
795: break;
796: case '4':
797: IPv4or6 = AF_INET;
798: break;
799: case '6':
800: IPv4or6 = AF_INET6;
801: break;
802: default:
803: usage();
1.1 markus 804: }
805: }
1.26 markus 806: if (optind == argc && !fopt_count)
1.1 markus 807: usage();
808:
1.26 markus 809: log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
810:
1.1 markus 811: maxfd = fdlim_get(1);
812: if (maxfd < 0)
1.4 markus 813: fatal("%s: fdlim_get: bad value", __progname);
1.1 markus 814: if (maxfd > MAXMAXFD)
815: maxfd = MAXMAXFD;
1.18 deraadt 816: if (MAXCON <= 0)
1.4 markus 817: fatal("%s: not enough file descriptors", __progname);
1.1 markus 818: if (maxfd > fdlim_get(0))
819: fdlim_set(maxfd);
1.63 djm 820: fdcon = xcalloc(maxfd, sizeof(con));
1.141 deraadt 821: read_wait = xcalloc(maxfd, sizeof(struct pollfd));
1.142 deraadt 822: for (j = 0; j < maxfd; j++)
823: read_wait[j].fd = -1;
1.1 markus 824:
1.82 djm 825: for (j = 0; j < fopt_count; j++) {
826: if (argv[j] == NULL)
827: fp = stdin;
828: else if ((fp = fopen(argv[j], "r")) == NULL)
1.156 ! tobias 829: fatal("%s: %s: %s", __progname,
! 830: fp == stdin ? "<stdin>" : argv[j], strerror(errno));
1.82 djm 831:
1.120 markus 832: while (getline(&line, &linesize, fp) != -1) {
1.82 djm 833: /* Chomp off trailing whitespace and comments */
834: if ((cp = strchr(line, '#')) == NULL)
835: cp = line + strlen(line) - 1;
836: while (cp >= line) {
837: if (*cp == ' ' || *cp == '\t' ||
838: *cp == '\n' || *cp == '#')
839: *cp-- = '\0';
840: else
841: break;
842: }
843:
844: /* Skip empty lines */
845: if (*line == '\0')
1.28 danh 846: continue;
1.82 djm 847:
848: do_host(line);
1.26 markus 849: }
1.82 djm 850:
851: if (ferror(fp))
1.156 ! tobias 852: fatal("%s: %s: %s", __progname,
! 853: fp == stdin ? "<stdin>" : argv[j], strerror(errno));
1.82 djm 854:
1.156 ! tobias 855: if (fp != stdin)
! 856: fclose(fp);
1.26 markus 857: }
1.120 markus 858: free(line);
1.26 markus 859:
860: while (optind < argc)
861: do_host(argv[optind++]);
1.1 markus 862:
863: while (ncon > 0)
864: conloop();
865:
1.126 djm 866: return found_one ? 0 : 1;
1.1 markus 867: }
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