blob: 3fabfba140765af85af2ca97debf89edb600ea67 [file] [log] [blame]
Damien Miller1f0311c2014-05-15 14:24:09 +10001/* $OpenBSD: ssh-keyscan.c,v 1.92 2014/04/29 18:01:49 markus 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
Damien Miller5be9d9e2013-12-07 11:24:01 +110059#define KT_ED25519 16
Kevin Steves76e7d9b2001-09-20 20:30:09 +000060
Damien Miller1c7ef4b2014-04-20 12:59:46 +100061int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519;
Ben Lindstromb6434ae2000-12-05 01:15:09 +000062
Damien Millerdb7b8172005-03-01 21:48:03 +110063int hash_hosts = 0; /* Hash hostname on output */
64
Ben Lindstromb6434ae2000-12-05 01:15:09 +000065#define MAXMAXFD 256
66
67/* The number of seconds after which to give up on a TCP connection */
68int timeout = 5;
69
70int maxfd;
Ben Lindstromd20b8552001-03-05 07:01:18 +000071#define MAXCON (maxfd - 10)
Ben Lindstromb6434ae2000-12-05 01:15:09 +000072
Kevin Stevesec84dc12000-12-13 17:45:15 +000073extern char *__progname;
Ben Lindstromc1e04212001-03-05 07:04:38 +000074fd_set *read_wait;
Damien Miller07d86be2006-03-26 14:19:21 +110075size_t read_wait_nfdset;
Ben Lindstromb6434ae2000-12-05 01:15:09 +000076int ncon;
Ben Lindstrom325e70c2001-08-06 22:41:30 +000077int nonfatal_fatal = 0;
78jmp_buf kexjmp;
Ben Lindstrom520b55c2001-09-12 18:05:05 +000079Key *kexjmp_key;
Ben Lindstromb6434ae2000-12-05 01:15:09 +000080
81/*
82 * Keep a connection structure for each file descriptor. The state
83 * associated with file descriptor n is held in fdcon[n].
84 */
85typedef struct Connection {
Ben Lindstrom46c16222000-12-22 01:43:59 +000086 u_char c_status; /* State of connection on this file desc. */
Ben Lindstromb6434ae2000-12-05 01:15:09 +000087#define CS_UNUSED 0 /* File descriptor unused */
88#define CS_CON 1 /* Waiting to connect/read greeting */
89#define CS_SIZE 2 /* Waiting to read initial packet size */
90#define CS_KEYS 3 /* Waiting to read public key packet */
91 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
92 int c_plen; /* Packet length field for ssh packet */
93 int c_len; /* Total bytes which must be read. */
94 int c_off; /* Length of data read so far. */
Ben Lindstrom325e70c2001-08-06 22:41:30 +000095 int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
Ben Lindstromb6434ae2000-12-05 01:15:09 +000096 char *c_namebase; /* Address to free for c_name and c_namelist */
97 char *c_name; /* Hostname of connection for errors */
98 char *c_namelist; /* Pointer to other possible addresses */
99 char *c_output_name; /* Hostname of connection for output */
100 char *c_data; /* Data read from this fd */
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000101 Kex *c_kex; /* The key-exchange struct for ssh2 */
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000102 struct timeval c_tv; /* Time at which connection gets aborted */
103 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
104} con;
105
106TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
107con *fdcon;
108
Ben Lindstrombba81212001-06-25 05:01:22 +0000109static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000110fdlim_get(int hard)
111{
Ben Lindstrom5adbad22000-12-27 07:06:21 +0000112#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000113 struct rlimit rlfd;
Ben Lindstromb0a4cd82001-03-05 04:54:49 +0000114
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000115 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
116 return (-1);
117 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
Damien Millere00074a2003-11-24 13:07:45 +1100118 return SSH_SYSFDMAX;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000119 else
120 return hard ? rlfd.rlim_max : rlfd.rlim_cur;
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000121#else
Damien Millere00074a2003-11-24 13:07:45 +1100122 return SSH_SYSFDMAX;
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000123#endif
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000124}
125
Ben Lindstrombba81212001-06-25 05:01:22 +0000126static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000127fdlim_set(int lim)
128{
Ben Lindstrom5adbad22000-12-27 07:06:21 +0000129#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000130 struct rlimit rlfd;
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000131#endif
Ben Lindstrom5c98db52002-07-07 22:25:29 +0000132
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000133 if (lim <= 0)
134 return (-1);
Ben Lindstrom5adbad22000-12-27 07:06:21 +0000135#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000136 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
137 return (-1);
138 rlfd.rlim_cur = lim;
139 if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
140 return (-1);
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000141#elif defined (HAVE_SETDTABLESIZE)
Kevin Steves28a7f262001-02-05 15:43:59 +0000142 setdtablesize(lim);
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000143#endif
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000144 return (0);
145}
146
147/*
148 * This is an strsep function that returns a null field for adjacent
149 * separators. This is the same as the 4.4BSD strsep, but different from the
150 * one in the GNU libc.
151 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000152static char *
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000153xstrsep(char **str, const char *delim)
154{
155 char *s, *e;
156
157 if (!**str)
158 return (NULL);
159
160 s = *str;
161 e = s + strcspn(s, delim);
162
163 if (*e != '\0')
164 *e++ = '\0';
165 *str = e;
166
167 return (s);
168}
169
170/*
171 * Get the next non-null token (like GNU strsep). Strsep() will return a
172 * null token for two adjacent separators, so we may have to loop.
173 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000174static char *
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000175strnnsep(char **stringp, char *delim)
176{
177 char *tok;
178
179 do {
180 tok = xstrsep(stringp, delim);
181 } while (tok && *tok == '\0');
182 return (tok);
183}
184
Damien Miller1f0311c2014-05-15 14:24:09 +1000185#ifdef WITH_SSH1
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000186static Key *
187keygrab_ssh1(con *c)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000188{
189 static Key *rsa;
190 static Buffer msg;
191
192 if (rsa == NULL) {
193 buffer_init(&msg);
194 rsa = key_new(KEY_RSA1);
195 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000196 buffer_append(&msg, c->c_data, c->c_plen);
197 buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000198 if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000199 error("%s: invalid packet type", c->c_name);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000200 buffer_clear(&msg);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000201 return NULL;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000202 }
203 buffer_consume(&msg, 8); /* cookie */
204
205 /* server key */
206 (void) buffer_get_int(&msg);
207 buffer_get_bignum(&msg, rsa->rsa->e);
208 buffer_get_bignum(&msg, rsa->rsa->n);
209
210 /* host key */
211 (void) buffer_get_int(&msg);
212 buffer_get_bignum(&msg, rsa->rsa->e);
213 buffer_get_bignum(&msg, rsa->rsa->n);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000214
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000215 buffer_clear(&msg);
216
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000217 return (rsa);
218}
Damien Miller1f0311c2014-05-15 14:24:09 +1000219#endif
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000220
221static int
222hostjump(Key *hostkey)
223{
Ben Lindstrom520b55c2001-09-12 18:05:05 +0000224 kexjmp_key = hostkey;
225 longjmp(kexjmp, 1);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000226}
227
228static int
229ssh2_capable(int remote_major, int remote_minor)
230{
231 switch (remote_major) {
232 case 1:
233 if (remote_minor == 99)
234 return 1;
235 break;
236 case 2:
237 return 1;
238 default:
239 break;
240 }
241 return 0;
242}
243
244static Key *
245keygrab_ssh2(con *c)
246{
Damien Miller9235a032014-04-20 13:17:20 +1000247 char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000248 int j;
249
250 packet_set_connection(c->c_fd, c->c_fd);
251 enable_compat20();
Damien Miller5be9d9e2013-12-07 11:24:01 +1100252 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
253 c->c_keytype == KT_DSA ? "ssh-dss" :
254 (c->c_keytype == KT_RSA ? "ssh-rsa" :
255 (c->c_keytype == KT_ED25519 ? "ssh-ed25519" :
256 "ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521"));
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000257 c->c_kex = kex_setup(myproposal);
Damien Miller1f0311c2014-05-15 14:24:09 +1000258#ifdef WITH_OPENSSL
Damien Miller8e7fb332003-02-24 12:03:03 +1100259 c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
Damien Millerf675fc42004-06-15 10:30:09 +1000260 c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
Damien Miller8e7fb332003-02-24 12:03:03 +1100261 c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
Damien Millera63128d2006-03-15 12:08:28 +1100262 c->c_kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
Damien Millereb8b60e2010-08-31 22:41:14 +1000263 c->c_kex->kex[KEX_ECDH_SHA2] = kexecdh_client;
Damien Miller1f0311c2014-05-15 14:24:09 +1000264#endif
Damien Miller1e124262013-11-04 08:26:52 +1100265 c->c_kex->kex[KEX_C25519_SHA256] = kexc25519_client;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000266 c->c_kex->verify_host_key = hostjump;
267
268 if (!(j = setjmp(kexjmp))) {
269 nonfatal_fatal = 1;
270 dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
271 fprintf(stderr, "Impossible! dispatch_run() returned!\n");
272 exit(1);
273 }
274 nonfatal_fatal = 0;
Darren Tuckera627d422013-06-02 07:31:17 +1000275 free(c->c_kex);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000276 c->c_kex = NULL;
277 packet_close();
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000278
Ben Lindstrom520b55c2001-09-12 18:05:05 +0000279 return j < 0? NULL : kexjmp_key;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000280}
281
282static void
283keyprint(con *c, Key *key)
284{
Damien Millerdb7b8172005-03-01 21:48:03 +1100285 char *host = c->c_output_name ? c->c_output_name : c->c_name;
286
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000287 if (!key)
288 return;
Damien Millerdb7b8172005-03-01 21:48:03 +1100289 if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL)
290 fatal("host_hash failed");
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000291
Damien Millerdb7b8172005-03-01 21:48:03 +1100292 fprintf(stdout, "%s ", host);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000293 key_write(key, stdout);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000294 fputs("\n", stdout);
295}
296
Ben Lindstrombba81212001-06-25 05:01:22 +0000297static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000298tcpconnect(char *host)
299{
300 struct addrinfo hints, *ai, *aitop;
301 char strport[NI_MAXSERV];
302 int gaierr, s = -1;
303
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000304 snprintf(strport, sizeof strport, "%d", ssh_port);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000305 memset(&hints, 0, sizeof(hints));
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000306 hints.ai_family = IPv4or6;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000307 hints.ai_socktype = SOCK_STREAM;
308 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
Darren Tucker4abde772007-12-29 02:43:51 +1100309 fatal("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000310 for (ai = aitop; ai; ai = ai->ai_next) {
Darren Tucker7bd98e72010-01-10 10:31:12 +1100311 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000312 if (s < 0) {
313 error("socket: %s", strerror(errno));
314 continue;
315 }
Damien Miller232711f2004-06-15 10:35:30 +1000316 if (set_nonblock(s) == -1)
317 fatal("%s: set_nonblock(%d)", __func__, s);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000318 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
319 errno != EINPROGRESS)
320 error("connect (`%s'): %s", host, strerror(errno));
321 else
322 break;
323 close(s);
324 s = -1;
325 }
326 freeaddrinfo(aitop);
327 return s;
328}
329
Ben Lindstrombba81212001-06-25 05:01:22 +0000330static int
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000331conalloc(char *iname, char *oname, int keytype)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000332{
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000333 char *namebase, *name, *namelist;
Ben Lindstrom965710f2002-07-07 22:17:22 +0000334 int s;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000335
336 namebase = namelist = xstrdup(iname);
337
338 do {
339 name = xstrsep(&namelist, ",");
340 if (!name) {
Darren Tuckera627d422013-06-02 07:31:17 +1000341 free(namebase);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000342 return (-1);
343 }
344 } while ((s = tcpconnect(name)) < 0);
345
346 if (s >= maxfd)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000347 fatal("conalloc: fdno %d too high", s);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000348 if (fdcon[s].c_status)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000349 fatal("conalloc: attempt to reuse fdno %d", s);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000350
351 fdcon[s].c_fd = s;
352 fdcon[s].c_status = CS_CON;
353 fdcon[s].c_namebase = namebase;
354 fdcon[s].c_name = name;
355 fdcon[s].c_namelist = namelist;
356 fdcon[s].c_output_name = xstrdup(oname);
357 fdcon[s].c_data = (char *) &fdcon[s].c_plen;
358 fdcon[s].c_len = 4;
359 fdcon[s].c_off = 0;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000360 fdcon[s].c_keytype = keytype;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000361 gettimeofday(&fdcon[s].c_tv, NULL);
362 fdcon[s].c_tv.tv_sec += timeout;
363 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
Ben Lindstromc1e04212001-03-05 07:04:38 +0000364 FD_SET(s, read_wait);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000365 ncon++;
366 return (s);
367}
368
Ben Lindstrombba81212001-06-25 05:01:22 +0000369static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000370confree(int s)
371{
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000372 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000373 fatal("confree: attempt to free bad fdno %d", s);
Ben Lindstromd20b8552001-03-05 07:01:18 +0000374 close(s);
Darren Tuckera627d422013-06-02 07:31:17 +1000375 free(fdcon[s].c_namebase);
376 free(fdcon[s].c_output_name);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000377 if (fdcon[s].c_status == CS_KEYS)
Darren Tuckera627d422013-06-02 07:31:17 +1000378 free(fdcon[s].c_data);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000379 fdcon[s].c_status = CS_UNUSED;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000380 fdcon[s].c_keytype = 0;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000381 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
Ben Lindstromc1e04212001-03-05 07:04:38 +0000382 FD_CLR(s, read_wait);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000383 ncon--;
384}
385
Ben Lindstrombba81212001-06-25 05:01:22 +0000386static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000387contouch(int s)
388{
389 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
390 gettimeofday(&fdcon[s].c_tv, NULL);
391 fdcon[s].c_tv.tv_sec += timeout;
392 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
393}
394
Ben Lindstrombba81212001-06-25 05:01:22 +0000395static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000396conrecycle(int s)
397{
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000398 con *c = &fdcon[s];
Ben Lindstrom965710f2002-07-07 22:17:22 +0000399 int ret;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000400
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000401 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000402 confree(s);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000403 return (ret);
404}
405
Ben Lindstrombba81212001-06-25 05:01:22 +0000406static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000407congreet(int s)
408{
Damien Millereccb9de2005-06-17 12:59:34 +1000409 int n = 0, remote_major = 0, remote_minor = 0;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000410 char buf[256], *cp;
Damien Miller83c02ef2001-12-21 12:45:43 +1100411 char remote_version[sizeof buf];
Damien Millereccb9de2005-06-17 12:59:34 +1000412 size_t bufsiz;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000413 con *c = &fdcon[s];
414
Damien Miller4bbacb72005-11-05 15:12:28 +1100415 for (;;) {
416 memset(buf, '\0', sizeof(buf));
417 bufsiz = sizeof(buf);
418 cp = buf;
419 while (bufsiz-- &&
420 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
421 if (*cp == '\r')
422 *cp = '\n';
423 cp++;
424 }
425 if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
426 break;
Ben Lindstromde8fc6f2001-08-06 22:43:50 +0000427 }
Ben Lindstrom6b28c352002-03-05 01:54:52 +0000428 if (n == 0) {
Damien Millerb253cc42005-05-26 12:23:44 +1000429 switch (errno) {
430 case EPIPE:
431 error("%s: Connection closed by remote host", c->c_name);
432 break;
433 case ECONNREFUSED:
434 break;
435 default:
436 error("read (%s): %s", c->c_name, strerror(errno));
437 break;
438 }
Ben Lindstrom6b28c352002-03-05 01:54:52 +0000439 conrecycle(s);
440 return;
441 }
Ben Lindstrom884a4ac2001-03-06 03:33:04 +0000442 if (*cp != '\n' && *cp != '\r') {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000443 error("%s: bad greeting", c->c_name);
444 confree(s);
445 return;
446 }
Ben Lindstrom884a4ac2001-03-06 03:33:04 +0000447 *cp = '\0';
Damien Miller83c02ef2001-12-21 12:45:43 +1100448 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
449 &remote_major, &remote_minor, remote_version) == 3)
450 compat_datafellows(remote_version);
451 else
452 datafellows = 0;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000453 if (c->c_keytype != KT_RSA1) {
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000454 if (!ssh2_capable(remote_major, remote_minor)) {
455 debug("%s doesn't support ssh2", c->c_name);
456 confree(s);
457 return;
458 }
Damien Miller83c02ef2001-12-21 12:45:43 +1100459 } else if (remote_major != 1) {
460 debug("%s doesn't support ssh1", c->c_name);
461 confree(s);
462 return;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000463 }
Ben Lindstromde8fc6f2001-08-06 22:43:50 +0000464 fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000465 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
466 c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
467 c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
Damien Millereccb9de2005-06-17 12:59:34 +1000468 if (n < 0 || (size_t)n >= sizeof(buf)) {
Damien Miller41bfc292005-05-26 12:07:32 +1000469 error("snprintf: buffer too small");
470 confree(s);
471 return;
472 }
Damien Millereccb9de2005-06-17 12:59:34 +1000473 if (atomicio(vwrite, s, buf, n) != (size_t)n) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000474 error("write (%s): %s", c->c_name, strerror(errno));
475 confree(s);
476 return;
477 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000478 if (c->c_keytype != KT_RSA1) {
479 keyprint(c, keygrab_ssh2(c));
480 confree(s);
481 return;
482 }
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000483 c->c_status = CS_SIZE;
484 contouch(s);
485}
486
Ben Lindstrombba81212001-06-25 05:01:22 +0000487static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000488conread(int s)
489{
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000490 con *c = &fdcon[s];
Damien Millerb253cc42005-05-26 12:23:44 +1000491 size_t n;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000492
493 if (c->c_status == CS_CON) {
494 congreet(s);
495 return;
496 }
Darren Tuckerfe6649d2004-08-13 21:19:37 +1000497 n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
Damien Millerb253cc42005-05-26 12:23:44 +1000498 if (n == 0) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000499 error("read (%s): %s", c->c_name, strerror(errno));
500 confree(s);
501 return;
502 }
503 c->c_off += n;
504
505 if (c->c_off == c->c_len)
506 switch (c->c_status) {
507 case CS_SIZE:
508 c->c_plen = htonl(c->c_plen);
509 c->c_len = c->c_plen + 8 - (c->c_plen & 7);
510 c->c_off = 0;
511 c->c_data = xmalloc(c->c_len);
512 c->c_status = CS_KEYS;
513 break;
Damien Miller1f0311c2014-05-15 14:24:09 +1000514#ifdef WITH_SSH1
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000515 case CS_KEYS:
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000516 keyprint(c, keygrab_ssh1(c));
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000517 confree(s);
518 return;
Damien Miller1f0311c2014-05-15 14:24:09 +1000519#endif
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000520 default:
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000521 fatal("conread: invalid status %d", c->c_status);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000522 break;
523 }
524
525 contouch(s);
526}
527
Ben Lindstrombba81212001-06-25 05:01:22 +0000528static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000529conloop(void)
530{
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000531 struct timeval seltime, now;
Ben Lindstrom965710f2002-07-07 22:17:22 +0000532 fd_set *r, *e;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000533 con *c;
Ben Lindstrom965710f2002-07-07 22:17:22 +0000534 int i;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000535
536 gettimeofday(&now, NULL);
Ben Lindstrom61c183b2002-06-21 00:09:54 +0000537 c = TAILQ_FIRST(&tq);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000538
Ben Lindstromd20b8552001-03-05 07:01:18 +0000539 if (c && (c->c_tv.tv_sec > now.tv_sec ||
540 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000541 seltime = c->c_tv;
542 seltime.tv_sec -= now.tv_sec;
543 seltime.tv_usec -= now.tv_usec;
Ben Lindstromc791beb2001-02-10 23:18:11 +0000544 if (seltime.tv_usec < 0) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000545 seltime.tv_usec += 1000000;
546 seltime.tv_sec--;
547 }
548 } else
Damien Millerc5219e72011-05-05 14:05:12 +1000549 timerclear(&seltime);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000550
Damien Miller07d86be2006-03-26 14:19:21 +1100551 r = xcalloc(read_wait_nfdset, sizeof(fd_mask));
552 e = xcalloc(read_wait_nfdset, sizeof(fd_mask));
553 memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask));
554 memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask));
Ben Lindstromc1e04212001-03-05 07:04:38 +0000555
556 while (select(maxfd, r, NULL, e, &seltime) == -1 &&
Damien Millerd8968ad2008-07-04 23:10:49 +1000557 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
Ben Lindstromf9452512001-02-15 03:12:08 +0000558 ;
559
Ben Lindstromd20b8552001-03-05 07:01:18 +0000560 for (i = 0; i < maxfd; i++) {
Ben Lindstromc1e04212001-03-05 07:04:38 +0000561 if (FD_ISSET(i, e)) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000562 error("%s: exception!", fdcon[i].c_name);
563 confree(i);
Ben Lindstromc1e04212001-03-05 07:04:38 +0000564 } else if (FD_ISSET(i, r))
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000565 conread(i);
Ben Lindstromd20b8552001-03-05 07:01:18 +0000566 }
Darren Tuckera627d422013-06-02 07:31:17 +1000567 free(r);
568 free(e);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000569
Ben Lindstrom61c183b2002-06-21 00:09:54 +0000570 c = TAILQ_FIRST(&tq);
Ben Lindstromd20b8552001-03-05 07:01:18 +0000571 while (c && (c->c_tv.tv_sec < now.tv_sec ||
572 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000573 int s = c->c_fd;
Ben Lindstromd20b8552001-03-05 07:01:18 +0000574
Ben Lindstrom61c183b2002-06-21 00:09:54 +0000575 c = TAILQ_NEXT(c, c_link);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000576 conrecycle(s);
577 }
578}
579
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000580static void
581do_host(char *host)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000582{
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000583 char *name = strnnsep(&host, " \t\n");
584 int j;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000585
Ben Lindstromeaffb9d2001-12-06 16:28:19 +0000586 if (name == NULL)
587 return;
Damien Miller5be9d9e2013-12-07 11:24:01 +1100588 for (j = KT_RSA1; j <= KT_ED25519; j *= 2) {
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000589 if (get_keytypes & j) {
590 while (ncon >= MAXCON)
591 conloop();
592 conalloc(name, *host ? host : name, j);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000593 }
594 }
595}
596
Ben Lindstrom9c8edc92002-02-26 17:52:14 +0000597void
598fatal(const char *fmt,...)
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000599{
Ben Lindstrom9c8edc92002-02-26 17:52:14 +0000600 va_list args;
Ben Lindstrom965710f2002-07-07 22:17:22 +0000601
Ben Lindstrom9c8edc92002-02-26 17:52:14 +0000602 va_start(args, fmt);
603 do_log(SYSLOG_LEVEL_FATAL, fmt, args);
604 va_end(args);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000605 if (nonfatal_fatal)
606 longjmp(kexjmp, -1);
Ben Lindstrom9c8edc92002-02-26 17:52:14 +0000607 else
Darren Tucker3d326222003-09-22 21:11:20 +1000608 exit(255);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000609}
610
611static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000612usage(void)
613{
Damien Millerc1719f72008-11-03 19:27:07 +1100614 fprintf(stderr,
615 "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n"
Darren Tucker7bd98e72010-01-10 10:31:12 +1100616 "\t\t [host | addrlist namelist] ...\n",
Ben Lindstromddfb1e32001-08-06 22:06:35 +0000617 __progname);
Ben Lindstromddfb1e32001-08-06 22:06:35 +0000618 exit(1);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000619}
620
621int
622main(int argc, char **argv)
623{
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000624 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
Damien Miller0e76c5e2010-06-26 09:39:59 +1000625 int opt, fopt_count = 0, j;
626 char *tname, *cp, line[NI_MAXHOST];
627 FILE *fp;
628 u_long linenum;
Kevin Steves76e7d9b2001-09-20 20:30:09 +0000629
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000630 extern int optind;
631 extern char *optarg;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000632
Damien Miller59d3d5b2003-08-22 09:34:41 +1000633 __progname = ssh_get_progname(argv[0]);
Ben Lindstrom4e088e42001-10-10 20:45:43 +0000634 seed_rng();
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000635 TAILQ_INIT(&tq);
636
Darren Tuckerce321d82005-10-03 18:11:24 +1000637 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
638 sanitise_stdfd();
639
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000640 if (argc <= 1)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000641 usage();
642
Darren Tucker7bd98e72010-01-10 10:31:12 +1100643 while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) {
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000644 switch (opt) {
Damien Millerdb7b8172005-03-01 21:48:03 +1100645 case 'H':
646 hash_hosts = 1;
647 break;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000648 case 'p':
649 ssh_port = a2port(optarg);
Damien Miller3dc71ad2009-01-28 16:31:22 +1100650 if (ssh_port <= 0) {
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000651 fprintf(stderr, "Bad port '%s'\n", optarg);
652 exit(1);
653 }
654 break;
655 case 'T':
Ben Lindstromedd098b2002-07-04 00:07:13 +0000656 timeout = convtime(optarg);
657 if (timeout == -1 || timeout == 0) {
658 fprintf(stderr, "Bad timeout '%s'\n", optarg);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000659 usage();
Ben Lindstromedd098b2002-07-04 00:07:13 +0000660 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000661 break;
662 case 'v':
663 if (!debug_flag) {
664 debug_flag = 1;
665 log_level = SYSLOG_LEVEL_DEBUG1;
666 }
667 else if (log_level < SYSLOG_LEVEL_DEBUG3)
668 log_level++;
669 else
670 fatal("Too high debugging level.");
671 break;
Kevin Steves76e7d9b2001-09-20 20:30:09 +0000672 case 'f':
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000673 if (strcmp(optarg, "-") == 0)
674 optarg = NULL;
675 argv[fopt_count++] = optarg;
676 break;
677 case 't':
678 get_keytypes = 0;
679 tname = strtok(optarg, ",");
680 while (tname) {
681 int type = key_type_from_name(tname);
682 switch (type) {
683 case KEY_RSA1:
684 get_keytypes |= KT_RSA1;
685 break;
686 case KEY_DSA:
687 get_keytypes |= KT_DSA;
688 break;
Damien Millereb8b60e2010-08-31 22:41:14 +1000689 case KEY_ECDSA:
690 get_keytypes |= KT_ECDSA;
691 break;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000692 case KEY_RSA:
693 get_keytypes |= KT_RSA;
694 break;
Damien Miller5be9d9e2013-12-07 11:24:01 +1100695 case KEY_ED25519:
696 get_keytypes |= KT_ED25519;
697 break;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000698 case KEY_UNSPEC:
Ben Lindstrom28c603b2001-12-06 16:45:10 +0000699 fatal("unknown key type %s", tname);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000700 }
701 tname = strtok(NULL, ",");
702 }
703 break;
704 case '4':
705 IPv4or6 = AF_INET;
706 break;
707 case '6':
708 IPv4or6 = AF_INET6;
709 break;
710 case '?':
711 default:
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000712 usage();
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000713 }
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000714 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000715 if (optind == argc && !fopt_count)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000716 usage();
717
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000718 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000719
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000720 maxfd = fdlim_get(1);
721 if (maxfd < 0)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000722 fatal("%s: fdlim_get: bad value", __progname);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000723 if (maxfd > MAXMAXFD)
724 maxfd = MAXMAXFD;
Ben Lindstromd20b8552001-03-05 07:01:18 +0000725 if (MAXCON <= 0)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000726 fatal("%s: not enough file descriptors", __progname);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000727 if (maxfd > fdlim_get(0))
728 fdlim_set(maxfd);
Damien Miller07d86be2006-03-26 14:19:21 +1100729 fdcon = xcalloc(maxfd, sizeof(con));
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000730
Damien Miller07d86be2006-03-26 14:19:21 +1100731 read_wait_nfdset = howmany(maxfd, NFDBITS);
732 read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));
Ben Lindstromc1e04212001-03-05 07:04:38 +0000733
Damien Miller0e76c5e2010-06-26 09:39:59 +1000734 for (j = 0; j < fopt_count; j++) {
735 if (argv[j] == NULL)
736 fp = stdin;
737 else if ((fp = fopen(argv[j], "r")) == NULL)
738 fatal("%s: %s: %s", __progname, argv[j],
739 strerror(errno));
740 linenum = 0;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000741
Damien Miller0e76c5e2010-06-26 09:39:59 +1000742 while (read_keyfile_line(fp,
743 argv[j] == NULL ? "(stdin)" : argv[j], line, sizeof(line),
744 &linenum) != -1) {
745 /* Chomp off trailing whitespace and comments */
746 if ((cp = strchr(line, '#')) == NULL)
747 cp = line + strlen(line) - 1;
748 while (cp >= line) {
749 if (*cp == ' ' || *cp == '\t' ||
750 *cp == '\n' || *cp == '#')
751 *cp-- = '\0';
752 else
753 break;
754 }
755
756 /* Skip empty lines */
757 if (*line == '\0')
Ben Lindstrom78bbd9e2001-09-12 17:10:40 +0000758 continue;
Damien Miller0e76c5e2010-06-26 09:39:59 +1000759
760 do_host(line);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000761 }
Damien Miller0e76c5e2010-06-26 09:39:59 +1000762
763 if (ferror(fp))
764 fatal("%s: %s: %s", __progname, argv[j],
765 strerror(errno));
766
767 fclose(fp);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000768 }
769
770 while (optind < argc)
771 do_host(argv[optind++]);
772
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000773 while (ncon > 0)
774 conloop();
775
776 return (0);
777}