blob: c9de130f46e772e1c5e15467eb800e727c886938 [file] [log] [blame]
Damien Miller839f7432012-04-22 11:24:21 +10001/* $OpenBSD: ssh-keyscan.c,v 1.86 2012/04/11 13:34:17 djm Exp $ */
Ben Lindstromb6434ae2000-12-05 01:15:09 +00002/*
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
Ben Lindstroma238f6e2001-06-09 01:30:39 +00007 * OpenBSD project by leaving this copyright notice intact.
Ben Lindstromb6434ae2000-12-05 01:15:09 +00008 */
9
10#include "includes.h"
Damien Millercd4223c2006-03-15 11:22:47 +110011
Damien Miller9b481512002-09-12 10:43:29 +100012#include "openbsd-compat/sys-queue.h"
Damien Millercd4223c2006-03-15 11:22:47 +110013#include <sys/resource.h>
Damien Miller9aec9192006-08-05 10:57:45 +100014#ifdef HAVE_SYS_TIME_H
15# include <sys/time.h>
16#endif
Damien Millere3476ed2006-07-24 14:13:33 +100017
Darren Tucker46aa3e02006-09-02 15:32:40 +100018#include <netinet/in.h>
19#include <arpa/inet.h>
20
Damien Millere3476ed2006-07-24 14:13:33 +100021#include <openssl/bn.h>
22
Damien Millerb8fe89c2006-07-24 14:51:00 +100023#include <netdb.h>
Darren Tuckerdeecec92006-07-12 22:44:34 +100024#include <errno.h>
Damien Millerbe43ebf2006-07-24 13:51:51 +100025#include <setjmp.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100026#include <stdarg.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100027#include <stdio.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100028#include <stdlib.h>
Damien Millerd7834352006-08-05 12:39:39 +100029#include <signal.h>
Damien Millere3476ed2006-07-24 14:13:33 +100030#include <string.h>
Damien Millere6b3b612006-07-24 14:01:23 +100031#include <unistd.h>
Ben Lindstromb6434ae2000-12-05 01:15:09 +000032
Ben Lindstromb6434ae2000-12-05 01:15:09 +000033#include "xmalloc.h"
34#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000035#include "ssh1.h"
Damien Millerd7834352006-08-05 12:39:39 +100036#include "buffer.h"
Ben Lindstromb6434ae2000-12-05 01:15:09 +000037#include "key.h"
Damien Millerd7834352006-08-05 12:39:39 +100038#include "cipher.h"
Ben Lindstrom325e70c2001-08-06 22:41:30 +000039#include "kex.h"
40#include "compat.h"
41#include "myproposal.h"
42#include "packet.h"
43#include "dispatch.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000044#include "log.h"
Ben Lindstromd20b8552001-03-05 07:01:18 +000045#include "atomicio.h"
Ben Lindstrom325e70c2001-08-06 22:41:30 +000046#include "misc.h"
Damien Millerdb7b8172005-03-01 21:48:03 +110047#include "hostfile.h"
Ben Lindstromb6434ae2000-12-05 01:15:09 +000048
Ben Lindstrom325e70c2001-08-06 22:41:30 +000049/* 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. */
Ben Lindstrom325e70c2001-08-06 22:41:30 +000051int IPv4or6 = AF_UNSPEC;
Ben Lindstromb6434ae2000-12-05 01:15:09 +000052
Ben Lindstrom325e70c2001-08-06 22:41:30 +000053int ssh_port = SSH_DEFAULT_PORT;
Kevin Steves76e7d9b2001-09-20 20:30:09 +000054
Damien Millereb8b60e2010-08-31 22:41:14 +100055#define KT_RSA1 1
56#define KT_DSA 2
57#define KT_RSA 4
58#define KT_ECDSA 8
Kevin Steves76e7d9b2001-09-20 20:30:09 +000059
Damien Miller839f7432012-04-22 11:24:21 +100060int get_keytypes = KT_RSA|KT_ECDSA;/* Get RSA and ECDSA keys by default */
Ben Lindstromb6434ae2000-12-05 01:15:09 +000061
Damien Millerdb7b8172005-03-01 21:48:03 +110062int hash_hosts = 0; /* Hash hostname on output */
63
Ben Lindstromb6434ae2000-12-05 01:15:09 +000064#define MAXMAXFD 256
65
66/* The number of seconds after which to give up on a TCP connection */
67int timeout = 5;
68
69int maxfd;
Ben Lindstromd20b8552001-03-05 07:01:18 +000070#define MAXCON (maxfd - 10)
Ben Lindstromb6434ae2000-12-05 01:15:09 +000071
Kevin Stevesec84dc12000-12-13 17:45:15 +000072extern char *__progname;
Ben Lindstromc1e04212001-03-05 07:04:38 +000073fd_set *read_wait;
Damien Miller07d86be2006-03-26 14:19:21 +110074size_t read_wait_nfdset;
Ben Lindstromb6434ae2000-12-05 01:15:09 +000075int ncon;
Ben Lindstrom325e70c2001-08-06 22:41:30 +000076int nonfatal_fatal = 0;
77jmp_buf kexjmp;
Ben Lindstrom520b55c2001-09-12 18:05:05 +000078Key *kexjmp_key;
Ben Lindstromb6434ae2000-12-05 01:15:09 +000079
80/*
81 * Keep a connection structure for each file descriptor. The state
82 * associated with file descriptor n is held in fdcon[n].
83 */
84typedef struct Connection {
Ben Lindstrom46c16222000-12-22 01:43:59 +000085 u_char c_status; /* State of connection on this file desc. */
Ben Lindstromb6434ae2000-12-05 01:15:09 +000086#define CS_UNUSED 0 /* File descriptor unused */
87#define CS_CON 1 /* Waiting to connect/read greeting */
88#define CS_SIZE 2 /* Waiting to read initial packet size */
89#define CS_KEYS 3 /* Waiting to read public key packet */
90 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
91 int c_plen; /* Packet length field for ssh packet */
92 int c_len; /* Total bytes which must be read. */
93 int c_off; /* Length of data read so far. */
Ben Lindstrom325e70c2001-08-06 22:41:30 +000094 int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
Ben Lindstromb6434ae2000-12-05 01:15:09 +000095 char *c_namebase; /* Address to free for c_name and c_namelist */
96 char *c_name; /* Hostname of connection for errors */
97 char *c_namelist; /* Pointer to other possible addresses */
98 char *c_output_name; /* Hostname of connection for output */
99 char *c_data; /* Data read from this fd */
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000100 Kex *c_kex; /* The key-exchange struct for ssh2 */
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000101 struct timeval c_tv; /* Time at which connection gets aborted */
102 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
103} con;
104
105TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
106con *fdcon;
107
Ben Lindstrombba81212001-06-25 05:01:22 +0000108static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000109fdlim_get(int hard)
110{
Ben Lindstrom5adbad22000-12-27 07:06:21 +0000111#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000112 struct rlimit rlfd;
Ben Lindstromb0a4cd82001-03-05 04:54:49 +0000113
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000114 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
115 return (-1);
116 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
Damien Millere00074a2003-11-24 13:07:45 +1100117 return SSH_SYSFDMAX;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000118 else
119 return hard ? rlfd.rlim_max : rlfd.rlim_cur;
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000120#else
Damien Millere00074a2003-11-24 13:07:45 +1100121 return SSH_SYSFDMAX;
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000122#endif
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000123}
124
Ben Lindstrombba81212001-06-25 05:01:22 +0000125static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000126fdlim_set(int lim)
127{
Ben Lindstrom5adbad22000-12-27 07:06:21 +0000128#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000129 struct rlimit rlfd;
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000130#endif
Ben Lindstrom5c98db52002-07-07 22:25:29 +0000131
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000132 if (lim <= 0)
133 return (-1);
Ben Lindstrom5adbad22000-12-27 07:06:21 +0000134#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000135 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
136 return (-1);
137 rlfd.rlim_cur = lim;
138 if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
139 return (-1);
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000140#elif defined (HAVE_SETDTABLESIZE)
Kevin Steves28a7f262001-02-05 15:43:59 +0000141 setdtablesize(lim);
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000142#endif
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000143 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 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000151static char *
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000152xstrsep(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 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000173static char *
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000174strnnsep(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
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000184static Key *
185keygrab_ssh1(con *c)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000186{
187 static Key *rsa;
188 static Buffer msg;
189
190 if (rsa == NULL) {
191 buffer_init(&msg);
192 rsa = key_new(KEY_RSA1);
193 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000194 buffer_append(&msg, c->c_data, c->c_plen);
195 buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000196 if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000197 error("%s: invalid packet type", c->c_name);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000198 buffer_clear(&msg);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000199 return NULL;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000200 }
201 buffer_consume(&msg, 8); /* cookie */
202
203 /* server key */
204 (void) buffer_get_int(&msg);
205 buffer_get_bignum(&msg, rsa->rsa->e);
206 buffer_get_bignum(&msg, rsa->rsa->n);
207
208 /* host key */
209 (void) buffer_get_int(&msg);
210 buffer_get_bignum(&msg, rsa->rsa->e);
211 buffer_get_bignum(&msg, rsa->rsa->n);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000212
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000213 buffer_clear(&msg);
214
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000215 return (rsa);
216}
217
218static int
219hostjump(Key *hostkey)
220{
Ben Lindstrom520b55c2001-09-12 18:05:05 +0000221 kexjmp_key = hostkey;
222 longjmp(kexjmp, 1);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000223}
224
225static int
226ssh2_capable(int remote_major, int remote_minor)
227{
228 switch (remote_major) {
229 case 1:
230 if (remote_minor == 99)
231 return 1;
232 break;
233 case 2:
234 return 1;
235 default:
236 break;
237 }
238 return 0;
239}
240
241static Key *
242keygrab_ssh2(con *c)
243{
244 int j;
245
246 packet_set_connection(c->c_fd, c->c_fd);
247 enable_compat20();
248 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA?
Damien Miller8ad960b2011-01-06 22:44:44 +1100249 "ssh-dss" : (c->c_keytype == KT_RSA ? "ssh-rsa" :
250 "ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521");
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000251 c->c_kex = kex_setup(myproposal);
Damien Miller8e7fb332003-02-24 12:03:03 +1100252 c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
Damien Millerf675fc42004-06-15 10:30:09 +1000253 c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
Damien Miller8e7fb332003-02-24 12:03:03 +1100254 c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
Damien Millera63128d2006-03-15 12:08:28 +1100255 c->c_kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
Damien Millereb8b60e2010-08-31 22:41:14 +1000256 c->c_kex->kex[KEX_ECDH_SHA2] = kexecdh_client;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000257 c->c_kex->verify_host_key = hostjump;
258
259 if (!(j = setjmp(kexjmp))) {
260 nonfatal_fatal = 1;
261 dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
262 fprintf(stderr, "Impossible! dispatch_run() returned!\n");
263 exit(1);
264 }
265 nonfatal_fatal = 0;
266 xfree(c->c_kex);
267 c->c_kex = NULL;
268 packet_close();
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000269
Ben Lindstrom520b55c2001-09-12 18:05:05 +0000270 return j < 0? NULL : kexjmp_key;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000271}
272
273static void
274keyprint(con *c, Key *key)
275{
Damien Millerdb7b8172005-03-01 21:48:03 +1100276 char *host = c->c_output_name ? c->c_output_name : c->c_name;
277
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000278 if (!key)
279 return;
Damien Millerdb7b8172005-03-01 21:48:03 +1100280 if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL)
281 fatal("host_hash failed");
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000282
Damien Millerdb7b8172005-03-01 21:48:03 +1100283 fprintf(stdout, "%s ", host);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000284 key_write(key, stdout);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000285 fputs("\n", stdout);
286}
287
Ben Lindstrombba81212001-06-25 05:01:22 +0000288static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000289tcpconnect(char *host)
290{
291 struct addrinfo hints, *ai, *aitop;
292 char strport[NI_MAXSERV];
293 int gaierr, s = -1;
294
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000295 snprintf(strport, sizeof strport, "%d", ssh_port);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000296 memset(&hints, 0, sizeof(hints));
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000297 hints.ai_family = IPv4or6;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000298 hints.ai_socktype = SOCK_STREAM;
299 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
Darren Tucker4abde772007-12-29 02:43:51 +1100300 fatal("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000301 for (ai = aitop; ai; ai = ai->ai_next) {
Darren Tucker7bd98e72010-01-10 10:31:12 +1100302 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000303 if (s < 0) {
304 error("socket: %s", strerror(errno));
305 continue;
306 }
Damien Miller232711f2004-06-15 10:35:30 +1000307 if (set_nonblock(s) == -1)
308 fatal("%s: set_nonblock(%d)", __func__, s);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000309 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
310 errno != EINPROGRESS)
311 error("connect (`%s'): %s", host, strerror(errno));
312 else
313 break;
314 close(s);
315 s = -1;
316 }
317 freeaddrinfo(aitop);
318 return s;
319}
320
Ben Lindstrombba81212001-06-25 05:01:22 +0000321static int
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000322conalloc(char *iname, char *oname, int keytype)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000323{
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000324 char *namebase, *name, *namelist;
Ben Lindstrom965710f2002-07-07 22:17:22 +0000325 int s;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000326
327 namebase = namelist = xstrdup(iname);
328
329 do {
330 name = xstrsep(&namelist, ",");
331 if (!name) {
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000332 xfree(namebase);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000333 return (-1);
334 }
335 } while ((s = tcpconnect(name)) < 0);
336
337 if (s >= maxfd)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000338 fatal("conalloc: fdno %d too high", s);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000339 if (fdcon[s].c_status)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000340 fatal("conalloc: attempt to reuse fdno %d", s);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000341
342 fdcon[s].c_fd = s;
343 fdcon[s].c_status = CS_CON;
344 fdcon[s].c_namebase = namebase;
345 fdcon[s].c_name = name;
346 fdcon[s].c_namelist = namelist;
347 fdcon[s].c_output_name = xstrdup(oname);
348 fdcon[s].c_data = (char *) &fdcon[s].c_plen;
349 fdcon[s].c_len = 4;
350 fdcon[s].c_off = 0;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000351 fdcon[s].c_keytype = keytype;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000352 gettimeofday(&fdcon[s].c_tv, NULL);
353 fdcon[s].c_tv.tv_sec += timeout;
354 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
Ben Lindstromc1e04212001-03-05 07:04:38 +0000355 FD_SET(s, read_wait);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000356 ncon++;
357 return (s);
358}
359
Ben Lindstrombba81212001-06-25 05:01:22 +0000360static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000361confree(int s)
362{
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000363 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000364 fatal("confree: attempt to free bad fdno %d", s);
Ben Lindstromd20b8552001-03-05 07:01:18 +0000365 close(s);
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000366 xfree(fdcon[s].c_namebase);
367 xfree(fdcon[s].c_output_name);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000368 if (fdcon[s].c_status == CS_KEYS)
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000369 xfree(fdcon[s].c_data);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000370 fdcon[s].c_status = CS_UNUSED;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000371 fdcon[s].c_keytype = 0;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000372 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
Ben Lindstromc1e04212001-03-05 07:04:38 +0000373 FD_CLR(s, read_wait);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000374 ncon--;
375}
376
Ben Lindstrombba81212001-06-25 05:01:22 +0000377static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000378contouch(int s)
379{
380 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
381 gettimeofday(&fdcon[s].c_tv, NULL);
382 fdcon[s].c_tv.tv_sec += timeout;
383 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
384}
385
Ben Lindstrombba81212001-06-25 05:01:22 +0000386static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000387conrecycle(int s)
388{
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000389 con *c = &fdcon[s];
Ben Lindstrom965710f2002-07-07 22:17:22 +0000390 int ret;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000391
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000392 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000393 confree(s);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000394 return (ret);
395}
396
Ben Lindstrombba81212001-06-25 05:01:22 +0000397static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000398congreet(int s)
399{
Damien Millereccb9de2005-06-17 12:59:34 +1000400 int n = 0, remote_major = 0, remote_minor = 0;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000401 char buf[256], *cp;
Damien Miller83c02ef2001-12-21 12:45:43 +1100402 char remote_version[sizeof buf];
Damien Millereccb9de2005-06-17 12:59:34 +1000403 size_t bufsiz;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000404 con *c = &fdcon[s];
405
Damien Miller4bbacb72005-11-05 15:12:28 +1100406 for (;;) {
407 memset(buf, '\0', sizeof(buf));
408 bufsiz = sizeof(buf);
409 cp = buf;
410 while (bufsiz-- &&
411 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
412 if (*cp == '\r')
413 *cp = '\n';
414 cp++;
415 }
416 if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
417 break;
Ben Lindstromde8fc6f2001-08-06 22:43:50 +0000418 }
Ben Lindstrom6b28c352002-03-05 01:54:52 +0000419 if (n == 0) {
Damien Millerb253cc42005-05-26 12:23:44 +1000420 switch (errno) {
421 case EPIPE:
422 error("%s: Connection closed by remote host", c->c_name);
423 break;
424 case ECONNREFUSED:
425 break;
426 default:
427 error("read (%s): %s", c->c_name, strerror(errno));
428 break;
429 }
Ben Lindstrom6b28c352002-03-05 01:54:52 +0000430 conrecycle(s);
431 return;
432 }
Ben Lindstrom884a4ac2001-03-06 03:33:04 +0000433 if (*cp != '\n' && *cp != '\r') {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000434 error("%s: bad greeting", c->c_name);
435 confree(s);
436 return;
437 }
Ben Lindstrom884a4ac2001-03-06 03:33:04 +0000438 *cp = '\0';
Damien Miller83c02ef2001-12-21 12:45:43 +1100439 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
440 &remote_major, &remote_minor, remote_version) == 3)
441 compat_datafellows(remote_version);
442 else
443 datafellows = 0;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000444 if (c->c_keytype != KT_RSA1) {
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000445 if (!ssh2_capable(remote_major, remote_minor)) {
446 debug("%s doesn't support ssh2", c->c_name);
447 confree(s);
448 return;
449 }
Damien Miller83c02ef2001-12-21 12:45:43 +1100450 } else if (remote_major != 1) {
451 debug("%s doesn't support ssh1", c->c_name);
452 confree(s);
453 return;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000454 }
Ben Lindstromde8fc6f2001-08-06 22:43:50 +0000455 fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000456 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
457 c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
458 c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
Damien Millereccb9de2005-06-17 12:59:34 +1000459 if (n < 0 || (size_t)n >= sizeof(buf)) {
Damien Miller41bfc292005-05-26 12:07:32 +1000460 error("snprintf: buffer too small");
461 confree(s);
462 return;
463 }
Damien Millereccb9de2005-06-17 12:59:34 +1000464 if (atomicio(vwrite, s, buf, n) != (size_t)n) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000465 error("write (%s): %s", c->c_name, strerror(errno));
466 confree(s);
467 return;
468 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000469 if (c->c_keytype != KT_RSA1) {
470 keyprint(c, keygrab_ssh2(c));
471 confree(s);
472 return;
473 }
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000474 c->c_status = CS_SIZE;
475 contouch(s);
476}
477
Ben Lindstrombba81212001-06-25 05:01:22 +0000478static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000479conread(int s)
480{
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000481 con *c = &fdcon[s];
Damien Millerb253cc42005-05-26 12:23:44 +1000482 size_t n;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000483
484 if (c->c_status == CS_CON) {
485 congreet(s);
486 return;
487 }
Darren Tuckerfe6649d2004-08-13 21:19:37 +1000488 n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
Damien Millerb253cc42005-05-26 12:23:44 +1000489 if (n == 0) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000490 error("read (%s): %s", c->c_name, strerror(errno));
491 confree(s);
492 return;
493 }
494 c->c_off += n;
495
496 if (c->c_off == c->c_len)
497 switch (c->c_status) {
498 case CS_SIZE:
499 c->c_plen = htonl(c->c_plen);
500 c->c_len = c->c_plen + 8 - (c->c_plen & 7);
501 c->c_off = 0;
502 c->c_data = xmalloc(c->c_len);
503 c->c_status = CS_KEYS;
504 break;
505 case CS_KEYS:
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000506 keyprint(c, keygrab_ssh1(c));
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000507 confree(s);
508 return;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000509 default:
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000510 fatal("conread: invalid status %d", c->c_status);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000511 break;
512 }
513
514 contouch(s);
515}
516
Ben Lindstrombba81212001-06-25 05:01:22 +0000517static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000518conloop(void)
519{
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000520 struct timeval seltime, now;
Ben Lindstrom965710f2002-07-07 22:17:22 +0000521 fd_set *r, *e;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000522 con *c;
Ben Lindstrom965710f2002-07-07 22:17:22 +0000523 int i;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000524
525 gettimeofday(&now, NULL);
Ben Lindstrom61c183b2002-06-21 00:09:54 +0000526 c = TAILQ_FIRST(&tq);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000527
Ben Lindstromd20b8552001-03-05 07:01:18 +0000528 if (c && (c->c_tv.tv_sec > now.tv_sec ||
529 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000530 seltime = c->c_tv;
531 seltime.tv_sec -= now.tv_sec;
532 seltime.tv_usec -= now.tv_usec;
Ben Lindstromc791beb2001-02-10 23:18:11 +0000533 if (seltime.tv_usec < 0) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000534 seltime.tv_usec += 1000000;
535 seltime.tv_sec--;
536 }
537 } else
Damien Millerc5219e72011-05-05 14:05:12 +1000538 timerclear(&seltime);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000539
Damien Miller07d86be2006-03-26 14:19:21 +1100540 r = xcalloc(read_wait_nfdset, sizeof(fd_mask));
541 e = xcalloc(read_wait_nfdset, sizeof(fd_mask));
542 memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask));
543 memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask));
Ben Lindstromc1e04212001-03-05 07:04:38 +0000544
545 while (select(maxfd, r, NULL, e, &seltime) == -1 &&
Damien Millerd8968ad2008-07-04 23:10:49 +1000546 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
Ben Lindstromf9452512001-02-15 03:12:08 +0000547 ;
548
Ben Lindstromd20b8552001-03-05 07:01:18 +0000549 for (i = 0; i < maxfd; i++) {
Ben Lindstromc1e04212001-03-05 07:04:38 +0000550 if (FD_ISSET(i, e)) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000551 error("%s: exception!", fdcon[i].c_name);
552 confree(i);
Ben Lindstromc1e04212001-03-05 07:04:38 +0000553 } else if (FD_ISSET(i, r))
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000554 conread(i);
Ben Lindstromd20b8552001-03-05 07:01:18 +0000555 }
Ben Lindstromc1e04212001-03-05 07:04:38 +0000556 xfree(r);
557 xfree(e);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000558
Ben Lindstrom61c183b2002-06-21 00:09:54 +0000559 c = TAILQ_FIRST(&tq);
Ben Lindstromd20b8552001-03-05 07:01:18 +0000560 while (c && (c->c_tv.tv_sec < now.tv_sec ||
561 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000562 int s = c->c_fd;
Ben Lindstromd20b8552001-03-05 07:01:18 +0000563
Ben Lindstrom61c183b2002-06-21 00:09:54 +0000564 c = TAILQ_NEXT(c, c_link);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000565 conrecycle(s);
566 }
567}
568
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000569static void
570do_host(char *host)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000571{
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000572 char *name = strnnsep(&host, " \t\n");
573 int j;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000574
Ben Lindstromeaffb9d2001-12-06 16:28:19 +0000575 if (name == NULL)
576 return;
Damien Miller8ad960b2011-01-06 22:44:44 +1100577 for (j = KT_RSA1; j <= KT_ECDSA; j *= 2) {
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000578 if (get_keytypes & j) {
579 while (ncon >= MAXCON)
580 conloop();
581 conalloc(name, *host ? host : name, j);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000582 }
583 }
584}
585
Ben Lindstrom9c8edc92002-02-26 17:52:14 +0000586void
587fatal(const char *fmt,...)
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000588{
Ben Lindstrom9c8edc92002-02-26 17:52:14 +0000589 va_list args;
Ben Lindstrom965710f2002-07-07 22:17:22 +0000590
Ben Lindstrom9c8edc92002-02-26 17:52:14 +0000591 va_start(args, fmt);
592 do_log(SYSLOG_LEVEL_FATAL, fmt, args);
593 va_end(args);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000594 if (nonfatal_fatal)
595 longjmp(kexjmp, -1);
Ben Lindstrom9c8edc92002-02-26 17:52:14 +0000596 else
Darren Tucker3d326222003-09-22 21:11:20 +1000597 exit(255);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000598}
599
600static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000601usage(void)
602{
Damien Millerc1719f72008-11-03 19:27:07 +1100603 fprintf(stderr,
604 "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n"
Darren Tucker7bd98e72010-01-10 10:31:12 +1100605 "\t\t [host | addrlist namelist] ...\n",
Ben Lindstromddfb1e32001-08-06 22:06:35 +0000606 __progname);
Ben Lindstromddfb1e32001-08-06 22:06:35 +0000607 exit(1);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000608}
609
610int
611main(int argc, char **argv)
612{
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000613 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
Damien Miller0e76c5e2010-06-26 09:39:59 +1000614 int opt, fopt_count = 0, j;
615 char *tname, *cp, line[NI_MAXHOST];
616 FILE *fp;
617 u_long linenum;
Kevin Steves76e7d9b2001-09-20 20:30:09 +0000618
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000619 extern int optind;
620 extern char *optarg;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000621
Damien Miller59d3d5b2003-08-22 09:34:41 +1000622 __progname = ssh_get_progname(argv[0]);
Ben Lindstrom4e088e42001-10-10 20:45:43 +0000623 seed_rng();
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000624 TAILQ_INIT(&tq);
625
Darren Tuckerce321d82005-10-03 18:11:24 +1000626 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
627 sanitise_stdfd();
628
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000629 if (argc <= 1)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000630 usage();
631
Darren Tucker7bd98e72010-01-10 10:31:12 +1100632 while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) {
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000633 switch (opt) {
Damien Millerdb7b8172005-03-01 21:48:03 +1100634 case 'H':
635 hash_hosts = 1;
636 break;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000637 case 'p':
638 ssh_port = a2port(optarg);
Damien Miller3dc71ad2009-01-28 16:31:22 +1100639 if (ssh_port <= 0) {
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000640 fprintf(stderr, "Bad port '%s'\n", optarg);
641 exit(1);
642 }
643 break;
644 case 'T':
Ben Lindstromedd098b2002-07-04 00:07:13 +0000645 timeout = convtime(optarg);
646 if (timeout == -1 || timeout == 0) {
647 fprintf(stderr, "Bad timeout '%s'\n", optarg);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000648 usage();
Ben Lindstromedd098b2002-07-04 00:07:13 +0000649 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000650 break;
651 case 'v':
652 if (!debug_flag) {
653 debug_flag = 1;
654 log_level = SYSLOG_LEVEL_DEBUG1;
655 }
656 else if (log_level < SYSLOG_LEVEL_DEBUG3)
657 log_level++;
658 else
659 fatal("Too high debugging level.");
660 break;
Kevin Steves76e7d9b2001-09-20 20:30:09 +0000661 case 'f':
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000662 if (strcmp(optarg, "-") == 0)
663 optarg = NULL;
664 argv[fopt_count++] = optarg;
665 break;
666 case 't':
667 get_keytypes = 0;
668 tname = strtok(optarg, ",");
669 while (tname) {
670 int type = key_type_from_name(tname);
671 switch (type) {
672 case KEY_RSA1:
673 get_keytypes |= KT_RSA1;
674 break;
675 case KEY_DSA:
676 get_keytypes |= KT_DSA;
677 break;
Damien Millereb8b60e2010-08-31 22:41:14 +1000678 case KEY_ECDSA:
679 get_keytypes |= KT_ECDSA;
680 break;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000681 case KEY_RSA:
682 get_keytypes |= KT_RSA;
683 break;
684 case KEY_UNSPEC:
Ben Lindstrom28c603b2001-12-06 16:45:10 +0000685 fatal("unknown key type %s", tname);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000686 }
687 tname = strtok(NULL, ",");
688 }
689 break;
690 case '4':
691 IPv4or6 = AF_INET;
692 break;
693 case '6':
694 IPv4or6 = AF_INET6;
695 break;
696 case '?':
697 default:
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000698 usage();
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000699 }
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000700 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000701 if (optind == argc && !fopt_count)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000702 usage();
703
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000704 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000705
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000706 maxfd = fdlim_get(1);
707 if (maxfd < 0)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000708 fatal("%s: fdlim_get: bad value", __progname);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000709 if (maxfd > MAXMAXFD)
710 maxfd = MAXMAXFD;
Ben Lindstromd20b8552001-03-05 07:01:18 +0000711 if (MAXCON <= 0)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000712 fatal("%s: not enough file descriptors", __progname);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000713 if (maxfd > fdlim_get(0))
714 fdlim_set(maxfd);
Damien Miller07d86be2006-03-26 14:19:21 +1100715 fdcon = xcalloc(maxfd, sizeof(con));
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000716
Damien Miller07d86be2006-03-26 14:19:21 +1100717 read_wait_nfdset = howmany(maxfd, NFDBITS);
718 read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));
Ben Lindstromc1e04212001-03-05 07:04:38 +0000719
Damien Miller0e76c5e2010-06-26 09:39:59 +1000720 for (j = 0; j < fopt_count; j++) {
721 if (argv[j] == NULL)
722 fp = stdin;
723 else if ((fp = fopen(argv[j], "r")) == NULL)
724 fatal("%s: %s: %s", __progname, argv[j],
725 strerror(errno));
726 linenum = 0;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000727
Damien Miller0e76c5e2010-06-26 09:39:59 +1000728 while (read_keyfile_line(fp,
729 argv[j] == NULL ? "(stdin)" : argv[j], line, sizeof(line),
730 &linenum) != -1) {
731 /* Chomp off trailing whitespace and comments */
732 if ((cp = strchr(line, '#')) == NULL)
733 cp = line + strlen(line) - 1;
734 while (cp >= line) {
735 if (*cp == ' ' || *cp == '\t' ||
736 *cp == '\n' || *cp == '#')
737 *cp-- = '\0';
738 else
739 break;
740 }
741
742 /* Skip empty lines */
743 if (*line == '\0')
Ben Lindstrom78bbd9e2001-09-12 17:10:40 +0000744 continue;
Damien Miller0e76c5e2010-06-26 09:39:59 +1000745
746 do_host(line);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000747 }
Damien Miller0e76c5e2010-06-26 09:39:59 +1000748
749 if (ferror(fp))
750 fatal("%s: %s: %s", __progname, argv[j],
751 strerror(errno));
752
753 fclose(fp);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000754 }
755
756 while (optind < argc)
757 do_host(argv[optind++]);
758
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000759 while (ncon > 0)
760 conloop();
761
762 return (0);
763}