blob: bc2c3b728886c03f688a0a3baf032f07a54b9c13 [file] [log] [blame]
Ben Lindstromb6434ae2000-12-05 01:15:09 +00001/*
2 * Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>.
3 *
4 * Modification and redistribution in source and binary forms is
5 * permitted provided that due credit is given to the author and the
Ben Lindstroma238f6e2001-06-09 01:30:39 +00006 * OpenBSD project by leaving this copyright notice intact.
Ben Lindstromb6434ae2000-12-05 01:15:09 +00007 */
8
9#include "includes.h"
Damien Miller9a2fdbd2005-03-02 12:04:01 +110010RCSID("$OpenBSD: ssh-keyscan.c,v 1.52 2005/03/01 15:47:14 jmc Exp $");
Ben Lindstromb6434ae2000-12-05 01:15:09 +000011
Damien Miller9b481512002-09-12 10:43:29 +100012#include "openbsd-compat/sys-queue.h"
Ben Lindstromb6434ae2000-12-05 01:15:09 +000013
14#include <openssl/bn.h>
Ben Lindstromb6434ae2000-12-05 01:15:09 +000015
Ben Lindstrom325e70c2001-08-06 22:41:30 +000016#include <setjmp.h>
Ben Lindstromb6434ae2000-12-05 01:15:09 +000017#include "xmalloc.h"
18#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000019#include "ssh1.h"
Ben Lindstromb6434ae2000-12-05 01:15:09 +000020#include "key.h"
Ben Lindstrom325e70c2001-08-06 22:41:30 +000021#include "kex.h"
22#include "compat.h"
23#include "myproposal.h"
24#include "packet.h"
25#include "dispatch.h"
Ben Lindstromb6434ae2000-12-05 01:15:09 +000026#include "buffer.h"
27#include "bufaux.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000028#include "log.h"
Ben Lindstromd20b8552001-03-05 07:01:18 +000029#include "atomicio.h"
Ben Lindstrom325e70c2001-08-06 22:41:30 +000030#include "misc.h"
Damien Millerdb7b8172005-03-01 21:48:03 +110031#include "hostfile.h"
Ben Lindstromb6434ae2000-12-05 01:15:09 +000032
Ben Lindstrom325e70c2001-08-06 22:41:30 +000033/* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
34 Default value is AF_UNSPEC means both IPv4 and IPv6. */
Ben Lindstrom325e70c2001-08-06 22:41:30 +000035int IPv4or6 = AF_UNSPEC;
Ben Lindstromb6434ae2000-12-05 01:15:09 +000036
Ben Lindstrom325e70c2001-08-06 22:41:30 +000037int ssh_port = SSH_DEFAULT_PORT;
Kevin Steves76e7d9b2001-09-20 20:30:09 +000038
39#define KT_RSA1 1
40#define KT_DSA 2
41#define KT_RSA 4
42
43int get_keytypes = KT_RSA1; /* Get only RSA1 keys by default */
Ben Lindstromb6434ae2000-12-05 01:15:09 +000044
Damien Millerdb7b8172005-03-01 21:48:03 +110045int hash_hosts = 0; /* Hash hostname on output */
46
Ben Lindstromb6434ae2000-12-05 01:15:09 +000047#define MAXMAXFD 256
48
49/* The number of seconds after which to give up on a TCP connection */
50int timeout = 5;
51
52int maxfd;
Ben Lindstromd20b8552001-03-05 07:01:18 +000053#define MAXCON (maxfd - 10)
Ben Lindstromb6434ae2000-12-05 01:15:09 +000054
Kevin Stevesec84dc12000-12-13 17:45:15 +000055extern char *__progname;
Ben Lindstromc1e04212001-03-05 07:04:38 +000056fd_set *read_wait;
57size_t read_wait_size;
Ben Lindstromb6434ae2000-12-05 01:15:09 +000058int ncon;
Ben Lindstrom325e70c2001-08-06 22:41:30 +000059int nonfatal_fatal = 0;
60jmp_buf kexjmp;
Ben Lindstrom520b55c2001-09-12 18:05:05 +000061Key *kexjmp_key;
Ben Lindstromb6434ae2000-12-05 01:15:09 +000062
63/*
64 * Keep a connection structure for each file descriptor. The state
65 * associated with file descriptor n is held in fdcon[n].
66 */
67typedef struct Connection {
Ben Lindstrom46c16222000-12-22 01:43:59 +000068 u_char c_status; /* State of connection on this file desc. */
Ben Lindstromb6434ae2000-12-05 01:15:09 +000069#define CS_UNUSED 0 /* File descriptor unused */
70#define CS_CON 1 /* Waiting to connect/read greeting */
71#define CS_SIZE 2 /* Waiting to read initial packet size */
72#define CS_KEYS 3 /* Waiting to read public key packet */
73 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
74 int c_plen; /* Packet length field for ssh packet */
75 int c_len; /* Total bytes which must be read. */
76 int c_off; /* Length of data read so far. */
Ben Lindstrom325e70c2001-08-06 22:41:30 +000077 int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
Ben Lindstromb6434ae2000-12-05 01:15:09 +000078 char *c_namebase; /* Address to free for c_name and c_namelist */
79 char *c_name; /* Hostname of connection for errors */
80 char *c_namelist; /* Pointer to other possible addresses */
81 char *c_output_name; /* Hostname of connection for output */
82 char *c_data; /* Data read from this fd */
Ben Lindstrom325e70c2001-08-06 22:41:30 +000083 Kex *c_kex; /* The key-exchange struct for ssh2 */
Ben Lindstromb6434ae2000-12-05 01:15:09 +000084 struct timeval c_tv; /* Time at which connection gets aborted */
85 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
86} con;
87
88TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
89con *fdcon;
90
91/*
92 * This is just a wrapper around fgets() to make it usable.
93 */
94
95/* Stress-test. Increase this later. */
96#define LINEBUF_SIZE 16
97
98typedef struct {
99 char *buf;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000100 u_int size;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000101 int lineno;
102 const char *filename;
103 FILE *stream;
104 void (*errfun) (const char *,...);
105} Linebuf;
106
Ben Lindstrombba81212001-06-25 05:01:22 +0000107static Linebuf *
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000108Linebuf_alloc(const char *filename, void (*errfun) (const char *,...))
109{
110 Linebuf *lb;
111
112 if (!(lb = malloc(sizeof(*lb)))) {
113 if (errfun)
Ben Lindstrom04f9af72002-07-04 00:03:56 +0000114 (*errfun) ("linebuf (%s): malloc failed\n",
115 filename ? filename : "(stdin)");
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000116 return (NULL);
117 }
118 if (filename) {
119 lb->filename = filename;
120 if (!(lb->stream = fopen(filename, "r"))) {
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000121 xfree(lb);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000122 if (errfun)
123 (*errfun) ("%s: %s\n", filename, strerror(errno));
124 return (NULL);
125 }
126 } else {
127 lb->filename = "(stdin)";
128 lb->stream = stdin;
129 }
130
131 if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) {
132 if (errfun)
133 (*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000134 xfree(lb);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000135 return (NULL);
136 }
137 lb->errfun = errfun;
138 lb->lineno = 0;
139 return (lb);
140}
141
Ben Lindstrombba81212001-06-25 05:01:22 +0000142static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000143Linebuf_free(Linebuf * lb)
144{
145 fclose(lb->stream);
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000146 xfree(lb->buf);
147 xfree(lb);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000148}
149
Ben Lindstrombba81212001-06-25 05:01:22 +0000150#if 0
151static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000152Linebuf_restart(Linebuf * lb)
153{
154 clearerr(lb->stream);
155 rewind(lb->stream);
156 lb->lineno = 0;
157}
158
Ben Lindstrombba81212001-06-25 05:01:22 +0000159static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000160Linebuf_lineno(Linebuf * lb)
161{
162 return (lb->lineno);
163}
Ben Lindstrombba81212001-06-25 05:01:22 +0000164#endif
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000165
Ben Lindstrombba81212001-06-25 05:01:22 +0000166static char *
Ben Lindstromc791beb2001-02-10 23:18:11 +0000167Linebuf_getline(Linebuf * lb)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000168{
169 int n = 0;
Ben Lindstrom965710f2002-07-07 22:17:22 +0000170 void *p;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000171
172 lb->lineno++;
173 for (;;) {
174 /* Read a line */
175 if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
176 if (ferror(lb->stream) && lb->errfun)
Ben Lindstrom965710f2002-07-07 22:17:22 +0000177 (*lb->errfun)("%s: %s\n", lb->filename,
Ben Lindstromb0a4cd82001-03-05 04:54:49 +0000178 strerror(errno));
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000179 return (NULL);
180 }
181 n = strlen(lb->buf);
182
183 /* Return it or an error if it fits */
184 if (n > 0 && lb->buf[n - 1] == '\n') {
185 lb->buf[n - 1] = '\0';
186 return (lb->buf);
187 }
188 if (n != lb->size - 1) {
189 if (lb->errfun)
Ben Lindstrom965710f2002-07-07 22:17:22 +0000190 (*lb->errfun)("%s: skipping incomplete last line\n",
Ben Lindstromb0a4cd82001-03-05 04:54:49 +0000191 lb->filename);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000192 return (NULL);
193 }
194 /* Double the buffer if we need more space */
Ben Lindstrom965710f2002-07-07 22:17:22 +0000195 lb->size *= 2;
196 if ((p = realloc(lb->buf, lb->size)) == NULL) {
197 lb->size /= 2;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000198 if (lb->errfun)
Ben Lindstrom965710f2002-07-07 22:17:22 +0000199 (*lb->errfun)("linebuf (%s): realloc failed\n",
Ben Lindstromb0a4cd82001-03-05 04:54:49 +0000200 lb->filename);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000201 return (NULL);
202 }
Ben Lindstrom965710f2002-07-07 22:17:22 +0000203 lb->buf = p;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000204 }
205}
206
Ben Lindstrombba81212001-06-25 05:01:22 +0000207static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000208fdlim_get(int hard)
209{
Ben Lindstrom5adbad22000-12-27 07:06:21 +0000210#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000211 struct rlimit rlfd;
Ben Lindstromb0a4cd82001-03-05 04:54:49 +0000212
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000213 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
214 return (-1);
215 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
Damien Millere00074a2003-11-24 13:07:45 +1100216 return SSH_SYSFDMAX;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000217 else
218 return hard ? rlfd.rlim_max : rlfd.rlim_cur;
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000219#else
Damien Millere00074a2003-11-24 13:07:45 +1100220 return SSH_SYSFDMAX;
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000221#endif
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000222}
223
Ben Lindstrombba81212001-06-25 05:01:22 +0000224static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000225fdlim_set(int lim)
226{
Ben Lindstrom5adbad22000-12-27 07:06:21 +0000227#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000228 struct rlimit rlfd;
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000229#endif
Ben Lindstrom5c98db52002-07-07 22:25:29 +0000230
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000231 if (lim <= 0)
232 return (-1);
Ben Lindstrom5adbad22000-12-27 07:06:21 +0000233#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000234 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
235 return (-1);
236 rlfd.rlim_cur = lim;
237 if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
238 return (-1);
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000239#elif defined (HAVE_SETDTABLESIZE)
Kevin Steves28a7f262001-02-05 15:43:59 +0000240 setdtablesize(lim);
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000241#endif
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000242 return (0);
243}
244
245/*
246 * This is an strsep function that returns a null field for adjacent
247 * separators. This is the same as the 4.4BSD strsep, but different from the
248 * one in the GNU libc.
249 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000250static char *
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000251xstrsep(char **str, const char *delim)
252{
253 char *s, *e;
254
255 if (!**str)
256 return (NULL);
257
258 s = *str;
259 e = s + strcspn(s, delim);
260
261 if (*e != '\0')
262 *e++ = '\0';
263 *str = e;
264
265 return (s);
266}
267
268/*
269 * Get the next non-null token (like GNU strsep). Strsep() will return a
270 * null token for two adjacent separators, so we may have to loop.
271 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000272static char *
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000273strnnsep(char **stringp, char *delim)
274{
275 char *tok;
276
277 do {
278 tok = xstrsep(stringp, delim);
279 } while (tok && *tok == '\0');
280 return (tok);
281}
282
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000283static Key *
284keygrab_ssh1(con *c)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000285{
286 static Key *rsa;
287 static Buffer msg;
288
289 if (rsa == NULL) {
290 buffer_init(&msg);
291 rsa = key_new(KEY_RSA1);
292 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000293 buffer_append(&msg, c->c_data, c->c_plen);
294 buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000295 if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000296 error("%s: invalid packet type", c->c_name);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000297 buffer_clear(&msg);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000298 return NULL;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000299 }
300 buffer_consume(&msg, 8); /* cookie */
301
302 /* server key */
303 (void) buffer_get_int(&msg);
304 buffer_get_bignum(&msg, rsa->rsa->e);
305 buffer_get_bignum(&msg, rsa->rsa->n);
306
307 /* host key */
308 (void) buffer_get_int(&msg);
309 buffer_get_bignum(&msg, rsa->rsa->e);
310 buffer_get_bignum(&msg, rsa->rsa->n);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000311
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000312 buffer_clear(&msg);
313
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000314 return (rsa);
315}
316
317static int
318hostjump(Key *hostkey)
319{
Ben Lindstrom520b55c2001-09-12 18:05:05 +0000320 kexjmp_key = hostkey;
321 longjmp(kexjmp, 1);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000322}
323
324static int
325ssh2_capable(int remote_major, int remote_minor)
326{
327 switch (remote_major) {
328 case 1:
329 if (remote_minor == 99)
330 return 1;
331 break;
332 case 2:
333 return 1;
334 default:
335 break;
336 }
337 return 0;
338}
339
340static Key *
341keygrab_ssh2(con *c)
342{
343 int j;
344
345 packet_set_connection(c->c_fd, c->c_fd);
346 enable_compat20();
347 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA?
348 "ssh-dss": "ssh-rsa";
349 c->c_kex = kex_setup(myproposal);
Damien Miller8e7fb332003-02-24 12:03:03 +1100350 c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
Damien Millerf675fc42004-06-15 10:30:09 +1000351 c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
Damien Miller8e7fb332003-02-24 12:03:03 +1100352 c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000353 c->c_kex->verify_host_key = hostjump;
354
355 if (!(j = setjmp(kexjmp))) {
356 nonfatal_fatal = 1;
357 dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
358 fprintf(stderr, "Impossible! dispatch_run() returned!\n");
359 exit(1);
360 }
361 nonfatal_fatal = 0;
362 xfree(c->c_kex);
363 c->c_kex = NULL;
364 packet_close();
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000365
Ben Lindstrom520b55c2001-09-12 18:05:05 +0000366 return j < 0? NULL : kexjmp_key;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000367}
368
369static void
370keyprint(con *c, Key *key)
371{
Damien Millerdb7b8172005-03-01 21:48:03 +1100372 char *host = c->c_output_name ? c->c_output_name : c->c_name;
373
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000374 if (!key)
375 return;
Damien Millerdb7b8172005-03-01 21:48:03 +1100376 if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL)
377 fatal("host_hash failed");
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000378
Damien Millerdb7b8172005-03-01 21:48:03 +1100379 fprintf(stdout, "%s ", host);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000380 key_write(key, stdout);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000381 fputs("\n", stdout);
382}
383
Ben Lindstrombba81212001-06-25 05:01:22 +0000384static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000385tcpconnect(char *host)
386{
387 struct addrinfo hints, *ai, *aitop;
388 char strport[NI_MAXSERV];
389 int gaierr, s = -1;
390
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000391 snprintf(strport, sizeof strport, "%d", ssh_port);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000392 memset(&hints, 0, sizeof(hints));
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000393 hints.ai_family = IPv4or6;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000394 hints.ai_socktype = SOCK_STREAM;
395 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
396 fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
397 for (ai = aitop; ai; ai = ai->ai_next) {
Damien Miller2372ace2003-05-14 13:42:23 +1000398 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000399 if (s < 0) {
400 error("socket: %s", strerror(errno));
401 continue;
402 }
Damien Miller232711f2004-06-15 10:35:30 +1000403 if (set_nonblock(s) == -1)
404 fatal("%s: set_nonblock(%d)", __func__, s);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000405 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
406 errno != EINPROGRESS)
407 error("connect (`%s'): %s", host, strerror(errno));
408 else
409 break;
410 close(s);
411 s = -1;
412 }
413 freeaddrinfo(aitop);
414 return s;
415}
416
Ben Lindstrombba81212001-06-25 05:01:22 +0000417static int
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000418conalloc(char *iname, char *oname, int keytype)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000419{
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000420 char *namebase, *name, *namelist;
Ben Lindstrom965710f2002-07-07 22:17:22 +0000421 int s;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000422
423 namebase = namelist = xstrdup(iname);
424
425 do {
426 name = xstrsep(&namelist, ",");
427 if (!name) {
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000428 xfree(namebase);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000429 return (-1);
430 }
431 } while ((s = tcpconnect(name)) < 0);
432
433 if (s >= maxfd)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000434 fatal("conalloc: fdno %d too high", s);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000435 if (fdcon[s].c_status)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000436 fatal("conalloc: attempt to reuse fdno %d", s);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000437
438 fdcon[s].c_fd = s;
439 fdcon[s].c_status = CS_CON;
440 fdcon[s].c_namebase = namebase;
441 fdcon[s].c_name = name;
442 fdcon[s].c_namelist = namelist;
443 fdcon[s].c_output_name = xstrdup(oname);
444 fdcon[s].c_data = (char *) &fdcon[s].c_plen;
445 fdcon[s].c_len = 4;
446 fdcon[s].c_off = 0;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000447 fdcon[s].c_keytype = keytype;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000448 gettimeofday(&fdcon[s].c_tv, NULL);
449 fdcon[s].c_tv.tv_sec += timeout;
450 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
Ben Lindstromc1e04212001-03-05 07:04:38 +0000451 FD_SET(s, read_wait);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000452 ncon++;
453 return (s);
454}
455
Ben Lindstrombba81212001-06-25 05:01:22 +0000456static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000457confree(int s)
458{
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000459 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000460 fatal("confree: attempt to free bad fdno %d", s);
Ben Lindstromd20b8552001-03-05 07:01:18 +0000461 close(s);
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000462 xfree(fdcon[s].c_namebase);
463 xfree(fdcon[s].c_output_name);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000464 if (fdcon[s].c_status == CS_KEYS)
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000465 xfree(fdcon[s].c_data);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000466 fdcon[s].c_status = CS_UNUSED;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000467 fdcon[s].c_keytype = 0;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000468 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
Ben Lindstromc1e04212001-03-05 07:04:38 +0000469 FD_CLR(s, read_wait);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000470 ncon--;
471}
472
Ben Lindstrombba81212001-06-25 05:01:22 +0000473static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000474contouch(int s)
475{
476 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
477 gettimeofday(&fdcon[s].c_tv, NULL);
478 fdcon[s].c_tv.tv_sec += timeout;
479 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
480}
481
Ben Lindstrombba81212001-06-25 05:01:22 +0000482static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000483conrecycle(int s)
484{
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000485 con *c = &fdcon[s];
Ben Lindstrom965710f2002-07-07 22:17:22 +0000486 int ret;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000487
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000488 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000489 confree(s);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000490 return (ret);
491}
492
Ben Lindstrombba81212001-06-25 05:01:22 +0000493static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000494congreet(int s)
495{
Damien Miller3b513012004-03-08 23:13:00 +1100496 int remote_major = 0, remote_minor = 0, n = 0;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000497 char buf[256], *cp;
Damien Miller83c02ef2001-12-21 12:45:43 +1100498 char remote_version[sizeof buf];
Ben Lindstrom884a4ac2001-03-06 03:33:04 +0000499 size_t bufsiz;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000500 con *c = &fdcon[s];
501
Ben Lindstrom884a4ac2001-03-06 03:33:04 +0000502 bufsiz = sizeof(buf);
503 cp = buf;
Darren Tuckerfe6649d2004-08-13 21:19:37 +1000504 while (bufsiz-- && (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
Ben Lindstromde8fc6f2001-08-06 22:43:50 +0000505 if (*cp == '\r')
506 *cp = '\n';
Ben Lindstrom884a4ac2001-03-06 03:33:04 +0000507 cp++;
Ben Lindstromde8fc6f2001-08-06 22:43:50 +0000508 }
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000509 if (n < 0) {
510 if (errno != ECONNREFUSED)
511 error("read (%s): %s", c->c_name, strerror(errno));
512 conrecycle(s);
513 return;
514 }
Ben Lindstrom6b28c352002-03-05 01:54:52 +0000515 if (n == 0) {
516 error("%s: Connection closed by remote host", c->c_name);
517 conrecycle(s);
518 return;
519 }
Ben Lindstrom884a4ac2001-03-06 03:33:04 +0000520 if (*cp != '\n' && *cp != '\r') {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000521 error("%s: bad greeting", c->c_name);
522 confree(s);
523 return;
524 }
Ben Lindstrom884a4ac2001-03-06 03:33:04 +0000525 *cp = '\0';
Damien Miller83c02ef2001-12-21 12:45:43 +1100526 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
527 &remote_major, &remote_minor, remote_version) == 3)
528 compat_datafellows(remote_version);
529 else
530 datafellows = 0;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000531 if (c->c_keytype != KT_RSA1) {
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000532 if (!ssh2_capable(remote_major, remote_minor)) {
533 debug("%s doesn't support ssh2", c->c_name);
534 confree(s);
535 return;
536 }
Damien Miller83c02ef2001-12-21 12:45:43 +1100537 } else if (remote_major != 1) {
538 debug("%s doesn't support ssh1", c->c_name);
539 confree(s);
540 return;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000541 }
Ben Lindstromde8fc6f2001-08-06 22:43:50 +0000542 fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000543 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
544 c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
545 c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
Darren Tucker9f63f222003-07-03 13:46:56 +1000546 if (atomicio(vwrite, s, buf, n) != n) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000547 error("write (%s): %s", c->c_name, strerror(errno));
548 confree(s);
549 return;
550 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000551 if (c->c_keytype != KT_RSA1) {
552 keyprint(c, keygrab_ssh2(c));
553 confree(s);
554 return;
555 }
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000556 c->c_status = CS_SIZE;
557 contouch(s);
558}
559
Ben Lindstrombba81212001-06-25 05:01:22 +0000560static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000561conread(int s)
562{
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000563 con *c = &fdcon[s];
Ben Lindstrom965710f2002-07-07 22:17:22 +0000564 int n;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000565
566 if (c->c_status == CS_CON) {
567 congreet(s);
568 return;
569 }
Darren Tuckerfe6649d2004-08-13 21:19:37 +1000570 n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000571 if (n < 0) {
572 error("read (%s): %s", c->c_name, strerror(errno));
573 confree(s);
574 return;
575 }
576 c->c_off += n;
577
578 if (c->c_off == c->c_len)
579 switch (c->c_status) {
580 case CS_SIZE:
581 c->c_plen = htonl(c->c_plen);
582 c->c_len = c->c_plen + 8 - (c->c_plen & 7);
583 c->c_off = 0;
584 c->c_data = xmalloc(c->c_len);
585 c->c_status = CS_KEYS;
586 break;
587 case CS_KEYS:
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000588 keyprint(c, keygrab_ssh1(c));
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000589 confree(s);
590 return;
591 break;
592 default:
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000593 fatal("conread: invalid status %d", c->c_status);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000594 break;
595 }
596
597 contouch(s);
598}
599
Ben Lindstrombba81212001-06-25 05:01:22 +0000600static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000601conloop(void)
602{
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000603 struct timeval seltime, now;
Ben Lindstrom965710f2002-07-07 22:17:22 +0000604 fd_set *r, *e;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000605 con *c;
Ben Lindstrom965710f2002-07-07 22:17:22 +0000606 int i;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000607
608 gettimeofday(&now, NULL);
Ben Lindstrom61c183b2002-06-21 00:09:54 +0000609 c = TAILQ_FIRST(&tq);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000610
Ben Lindstromd20b8552001-03-05 07:01:18 +0000611 if (c && (c->c_tv.tv_sec > now.tv_sec ||
612 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000613 seltime = c->c_tv;
614 seltime.tv_sec -= now.tv_sec;
615 seltime.tv_usec -= now.tv_usec;
Ben Lindstromc791beb2001-02-10 23:18:11 +0000616 if (seltime.tv_usec < 0) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000617 seltime.tv_usec += 1000000;
618 seltime.tv_sec--;
619 }
620 } else
621 seltime.tv_sec = seltime.tv_usec = 0;
622
Ben Lindstromc1e04212001-03-05 07:04:38 +0000623 r = xmalloc(read_wait_size);
624 memcpy(r, read_wait, read_wait_size);
625 e = xmalloc(read_wait_size);
626 memcpy(e, read_wait, read_wait_size);
627
628 while (select(maxfd, r, NULL, e, &seltime) == -1 &&
Ben Lindstromf9452512001-02-15 03:12:08 +0000629 (errno == EAGAIN || errno == EINTR))
630 ;
631
Ben Lindstromd20b8552001-03-05 07:01:18 +0000632 for (i = 0; i < maxfd; i++) {
Ben Lindstromc1e04212001-03-05 07:04:38 +0000633 if (FD_ISSET(i, e)) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000634 error("%s: exception!", fdcon[i].c_name);
635 confree(i);
Ben Lindstromc1e04212001-03-05 07:04:38 +0000636 } else if (FD_ISSET(i, r))
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000637 conread(i);
Ben Lindstromd20b8552001-03-05 07:01:18 +0000638 }
Ben Lindstromc1e04212001-03-05 07:04:38 +0000639 xfree(r);
640 xfree(e);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000641
Ben Lindstrom61c183b2002-06-21 00:09:54 +0000642 c = TAILQ_FIRST(&tq);
Ben Lindstromd20b8552001-03-05 07:01:18 +0000643 while (c && (c->c_tv.tv_sec < now.tv_sec ||
644 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000645 int s = c->c_fd;
Ben Lindstromd20b8552001-03-05 07:01:18 +0000646
Ben Lindstrom61c183b2002-06-21 00:09:54 +0000647 c = TAILQ_NEXT(c, c_link);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000648 conrecycle(s);
649 }
650}
651
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000652static void
653do_host(char *host)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000654{
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000655 char *name = strnnsep(&host, " \t\n");
656 int j;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000657
Ben Lindstromeaffb9d2001-12-06 16:28:19 +0000658 if (name == NULL)
659 return;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000660 for (j = KT_RSA1; j <= KT_RSA; j *= 2) {
661 if (get_keytypes & j) {
662 while (ncon >= MAXCON)
663 conloop();
664 conalloc(name, *host ? host : name, j);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000665 }
666 }
667}
668
Ben Lindstrom9c8edc92002-02-26 17:52:14 +0000669void
670fatal(const char *fmt,...)
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000671{
Ben Lindstrom9c8edc92002-02-26 17:52:14 +0000672 va_list args;
Ben Lindstrom965710f2002-07-07 22:17:22 +0000673
Ben Lindstrom9c8edc92002-02-26 17:52:14 +0000674 va_start(args, fmt);
675 do_log(SYSLOG_LEVEL_FATAL, fmt, args);
676 va_end(args);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000677 if (nonfatal_fatal)
678 longjmp(kexjmp, -1);
Ben Lindstrom9c8edc92002-02-26 17:52:14 +0000679 else
Darren Tucker3d326222003-09-22 21:11:20 +1000680 exit(255);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000681}
682
683static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000684usage(void)
685{
Damien Miller9a2fdbd2005-03-02 12:04:01 +1100686 fprintf(stderr, "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n"
Ben Lindstrom965710f2002-07-07 22:17:22 +0000687 "\t\t [host | addrlist namelist] [...]\n",
Ben Lindstromddfb1e32001-08-06 22:06:35 +0000688 __progname);
Ben Lindstromddfb1e32001-08-06 22:06:35 +0000689 exit(1);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000690}
691
692int
693main(int argc, char **argv)
694{
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000695 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
696 int opt, fopt_count = 0;
697 char *tname;
Kevin Steves76e7d9b2001-09-20 20:30:09 +0000698
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000699 extern int optind;
700 extern char *optarg;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000701
Damien Miller59d3d5b2003-08-22 09:34:41 +1000702 __progname = ssh_get_progname(argv[0]);
Ben Lindstrom4e088e42001-10-10 20:45:43 +0000703 init_rng();
704 seed_rng();
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000705 TAILQ_INIT(&tq);
706
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000707 if (argc <= 1)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000708 usage();
709
Damien Millerdb7b8172005-03-01 21:48:03 +1100710 while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) {
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000711 switch (opt) {
Damien Millerdb7b8172005-03-01 21:48:03 +1100712 case 'H':
713 hash_hosts = 1;
714 break;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000715 case 'p':
716 ssh_port = a2port(optarg);
717 if (ssh_port == 0) {
718 fprintf(stderr, "Bad port '%s'\n", optarg);
719 exit(1);
720 }
721 break;
722 case 'T':
Ben Lindstromedd098b2002-07-04 00:07:13 +0000723 timeout = convtime(optarg);
724 if (timeout == -1 || timeout == 0) {
725 fprintf(stderr, "Bad timeout '%s'\n", optarg);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000726 usage();
Ben Lindstromedd098b2002-07-04 00:07:13 +0000727 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000728 break;
729 case 'v':
730 if (!debug_flag) {
731 debug_flag = 1;
732 log_level = SYSLOG_LEVEL_DEBUG1;
733 }
734 else if (log_level < SYSLOG_LEVEL_DEBUG3)
735 log_level++;
736 else
737 fatal("Too high debugging level.");
738 break;
Kevin Steves76e7d9b2001-09-20 20:30:09 +0000739 case 'f':
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000740 if (strcmp(optarg, "-") == 0)
741 optarg = NULL;
742 argv[fopt_count++] = optarg;
743 break;
744 case 't':
745 get_keytypes = 0;
746 tname = strtok(optarg, ",");
747 while (tname) {
748 int type = key_type_from_name(tname);
749 switch (type) {
750 case KEY_RSA1:
751 get_keytypes |= KT_RSA1;
752 break;
753 case KEY_DSA:
754 get_keytypes |= KT_DSA;
755 break;
756 case KEY_RSA:
757 get_keytypes |= KT_RSA;
758 break;
759 case KEY_UNSPEC:
Ben Lindstrom28c603b2001-12-06 16:45:10 +0000760 fatal("unknown key type %s", tname);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000761 }
762 tname = strtok(NULL, ",");
763 }
764 break;
765 case '4':
766 IPv4or6 = AF_INET;
767 break;
768 case '6':
769 IPv4or6 = AF_INET6;
770 break;
771 case '?':
772 default:
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000773 usage();
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000774 }
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000775 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000776 if (optind == argc && !fopt_count)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000777 usage();
778
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000779 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000780
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000781 maxfd = fdlim_get(1);
782 if (maxfd < 0)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000783 fatal("%s: fdlim_get: bad value", __progname);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000784 if (maxfd > MAXMAXFD)
785 maxfd = MAXMAXFD;
Ben Lindstromd20b8552001-03-05 07:01:18 +0000786 if (MAXCON <= 0)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000787 fatal("%s: not enough file descriptors", __progname);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000788 if (maxfd > fdlim_get(0))
789 fdlim_set(maxfd);
790 fdcon = xmalloc(maxfd * sizeof(con));
Ben Lindstromc791beb2001-02-10 23:18:11 +0000791 memset(fdcon, 0, maxfd * sizeof(con));
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000792
Ben Lindstromc1e04212001-03-05 07:04:38 +0000793 read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask);
794 read_wait = xmalloc(read_wait_size);
795 memset(read_wait, 0, read_wait_size);
796
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000797 if (fopt_count) {
798 Linebuf *lb;
799 char *line;
800 int j;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000801
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000802 for (j = 0; j < fopt_count; j++) {
803 lb = Linebuf_alloc(argv[j], error);
Ben Lindstrom78bbd9e2001-09-12 17:10:40 +0000804 if (!lb)
805 continue;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000806 while ((line = Linebuf_getline(lb)) != NULL)
807 do_host(line);
808 Linebuf_free(lb);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000809 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000810 }
811
812 while (optind < argc)
813 do_host(argv[optind++]);
814
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000815 while (ncon > 0)
816 conloop();
817
818 return (0);
819}