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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"
Ben Lindstrom6a9fbc92002-07-07 22:19:13 +000010RCSID("$OpenBSD: ssh-keyscan.c,v 1.40 2002/07/06 17:47:58 stevesk 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"
Ben Lindstromb6434ae2000-12-05 01:15:09 +000031
Ben Lindstrom325e70c2001-08-06 22:41:30 +000032/* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
33 Default value is AF_UNSPEC means both IPv4 and IPv6. */
Damien Millerefdc1f12001-11-15 08:40:45 +110034#ifdef IPV4_DEFAULT
35int IPv4or6 = AF_INET;
36#else
Ben Lindstrom325e70c2001-08-06 22:41:30 +000037int IPv4or6 = AF_UNSPEC;
Damien Millerefdc1f12001-11-15 08:40:45 +110038#endif
Ben Lindstromb6434ae2000-12-05 01:15:09 +000039
Ben Lindstrom325e70c2001-08-06 22:41:30 +000040int ssh_port = SSH_DEFAULT_PORT;
Kevin Steves76e7d9b2001-09-20 20:30:09 +000041
42#define KT_RSA1 1
43#define KT_DSA 2
44#define KT_RSA 4
45
46int get_keytypes = KT_RSA1; /* Get only RSA1 keys by default */
Ben Lindstromb6434ae2000-12-05 01:15:09 +000047
Ben Lindstromb6434ae2000-12-05 01:15:09 +000048#define MAXMAXFD 256
49
50/* The number of seconds after which to give up on a TCP connection */
51int timeout = 5;
52
53int maxfd;
Ben Lindstromd20b8552001-03-05 07:01:18 +000054#define MAXCON (maxfd - 10)
Ben Lindstromb6434ae2000-12-05 01:15:09 +000055
Kevin Stevesec84dc12000-12-13 17:45:15 +000056#ifdef HAVE___PROGNAME
57extern char *__progname;
58#else
59char *__progname;
60#endif
Ben Lindstromc1e04212001-03-05 07:04:38 +000061fd_set *read_wait;
62size_t read_wait_size;
Ben Lindstromb6434ae2000-12-05 01:15:09 +000063int ncon;
Ben Lindstrom325e70c2001-08-06 22:41:30 +000064int nonfatal_fatal = 0;
65jmp_buf kexjmp;
Ben Lindstrom520b55c2001-09-12 18:05:05 +000066Key *kexjmp_key;
Ben Lindstromb6434ae2000-12-05 01:15:09 +000067
68/*
69 * Keep a connection structure for each file descriptor. The state
70 * associated with file descriptor n is held in fdcon[n].
71 */
72typedef struct Connection {
Ben Lindstrom46c16222000-12-22 01:43:59 +000073 u_char c_status; /* State of connection on this file desc. */
Ben Lindstromb6434ae2000-12-05 01:15:09 +000074#define CS_UNUSED 0 /* File descriptor unused */
75#define CS_CON 1 /* Waiting to connect/read greeting */
76#define CS_SIZE 2 /* Waiting to read initial packet size */
77#define CS_KEYS 3 /* Waiting to read public key packet */
78 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
79 int c_plen; /* Packet length field for ssh packet */
80 int c_len; /* Total bytes which must be read. */
81 int c_off; /* Length of data read so far. */
Ben Lindstrom325e70c2001-08-06 22:41:30 +000082 int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
Ben Lindstromb6434ae2000-12-05 01:15:09 +000083 char *c_namebase; /* Address to free for c_name and c_namelist */
84 char *c_name; /* Hostname of connection for errors */
85 char *c_namelist; /* Pointer to other possible addresses */
86 char *c_output_name; /* Hostname of connection for output */
87 char *c_data; /* Data read from this fd */
Ben Lindstrom325e70c2001-08-06 22:41:30 +000088 Kex *c_kex; /* The key-exchange struct for ssh2 */
Ben Lindstromb6434ae2000-12-05 01:15:09 +000089 struct timeval c_tv; /* Time at which connection gets aborted */
90 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
91} con;
92
93TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
94con *fdcon;
95
96/*
97 * This is just a wrapper around fgets() to make it usable.
98 */
99
100/* Stress-test. Increase this later. */
101#define LINEBUF_SIZE 16
102
103typedef struct {
104 char *buf;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000105 u_int size;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000106 int lineno;
107 const char *filename;
108 FILE *stream;
109 void (*errfun) (const char *,...);
110} Linebuf;
111
Ben Lindstrombba81212001-06-25 05:01:22 +0000112static Linebuf *
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000113Linebuf_alloc(const char *filename, void (*errfun) (const char *,...))
114{
115 Linebuf *lb;
116
117 if (!(lb = malloc(sizeof(*lb)))) {
118 if (errfun)
Ben Lindstrom04f9af72002-07-04 00:03:56 +0000119 (*errfun) ("linebuf (%s): malloc failed\n",
120 filename ? filename : "(stdin)");
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000121 return (NULL);
122 }
123 if (filename) {
124 lb->filename = filename;
125 if (!(lb->stream = fopen(filename, "r"))) {
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000126 xfree(lb);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000127 if (errfun)
128 (*errfun) ("%s: %s\n", filename, strerror(errno));
129 return (NULL);
130 }
131 } else {
132 lb->filename = "(stdin)";
133 lb->stream = stdin;
134 }
135
136 if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) {
137 if (errfun)
138 (*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000139 xfree(lb);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000140 return (NULL);
141 }
142 lb->errfun = errfun;
143 lb->lineno = 0;
144 return (lb);
145}
146
Ben Lindstrombba81212001-06-25 05:01:22 +0000147static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000148Linebuf_free(Linebuf * lb)
149{
150 fclose(lb->stream);
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000151 xfree(lb->buf);
152 xfree(lb);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000153}
154
Ben Lindstrombba81212001-06-25 05:01:22 +0000155#if 0
156static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000157Linebuf_restart(Linebuf * lb)
158{
159 clearerr(lb->stream);
160 rewind(lb->stream);
161 lb->lineno = 0;
162}
163
Ben Lindstrombba81212001-06-25 05:01:22 +0000164static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000165Linebuf_lineno(Linebuf * lb)
166{
167 return (lb->lineno);
168}
Ben Lindstrombba81212001-06-25 05:01:22 +0000169#endif
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000170
Ben Lindstrombba81212001-06-25 05:01:22 +0000171static char *
Ben Lindstromc791beb2001-02-10 23:18:11 +0000172Linebuf_getline(Linebuf * lb)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000173{
174 int n = 0;
Ben Lindstrom965710f2002-07-07 22:17:22 +0000175 void *p;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000176
177 lb->lineno++;
178 for (;;) {
179 /* Read a line */
180 if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
181 if (ferror(lb->stream) && lb->errfun)
Ben Lindstrom965710f2002-07-07 22:17:22 +0000182 (*lb->errfun)("%s: %s\n", lb->filename,
Ben Lindstromb0a4cd82001-03-05 04:54:49 +0000183 strerror(errno));
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000184 return (NULL);
185 }
186 n = strlen(lb->buf);
187
188 /* Return it or an error if it fits */
189 if (n > 0 && lb->buf[n - 1] == '\n') {
190 lb->buf[n - 1] = '\0';
191 return (lb->buf);
192 }
193 if (n != lb->size - 1) {
194 if (lb->errfun)
Ben Lindstrom965710f2002-07-07 22:17:22 +0000195 (*lb->errfun)("%s: skipping incomplete last line\n",
Ben Lindstromb0a4cd82001-03-05 04:54:49 +0000196 lb->filename);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000197 return (NULL);
198 }
199 /* Double the buffer if we need more space */
Ben Lindstrom965710f2002-07-07 22:17:22 +0000200 lb->size *= 2;
201 if ((p = realloc(lb->buf, lb->size)) == NULL) {
202 lb->size /= 2;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000203 if (lb->errfun)
Ben Lindstrom965710f2002-07-07 22:17:22 +0000204 (*lb->errfun)("linebuf (%s): realloc failed\n",
Ben Lindstromb0a4cd82001-03-05 04:54:49 +0000205 lb->filename);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000206 return (NULL);
207 }
Ben Lindstrom965710f2002-07-07 22:17:22 +0000208 lb->buf = p;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000209 }
210}
211
Ben Lindstrombba81212001-06-25 05:01:22 +0000212static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000213fdlim_get(int hard)
214{
Ben Lindstrom5adbad22000-12-27 07:06:21 +0000215#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000216 struct rlimit rlfd;
Ben Lindstromb0a4cd82001-03-05 04:54:49 +0000217
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000218 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
219 return (-1);
220 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
221 return 10000;
222 else
223 return hard ? rlfd.rlim_max : rlfd.rlim_cur;
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000224#elif defined (HAVE_SYSCONF)
225 return sysconf (_SC_OPEN_MAX);
226#else
227 return 10000;
228#endif
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000229}
230
Ben Lindstrombba81212001-06-25 05:01:22 +0000231static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000232fdlim_set(int lim)
233{
Ben Lindstrom5adbad22000-12-27 07:06:21 +0000234#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000235 struct rlimit rlfd;
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000236#endif
Ben Lindstrom5c98db52002-07-07 22:25:29 +0000237
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000238 if (lim <= 0)
239 return (-1);
Ben Lindstrom5adbad22000-12-27 07:06:21 +0000240#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000241 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
242 return (-1);
243 rlfd.rlim_cur = lim;
244 if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
245 return (-1);
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000246#elif defined (HAVE_SETDTABLESIZE)
Kevin Steves28a7f262001-02-05 15:43:59 +0000247 setdtablesize(lim);
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000248#endif
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000249 return (0);
250}
251
252/*
253 * This is an strsep function that returns a null field for adjacent
254 * separators. This is the same as the 4.4BSD strsep, but different from the
255 * one in the GNU libc.
256 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000257static char *
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000258xstrsep(char **str, const char *delim)
259{
260 char *s, *e;
261
262 if (!**str)
263 return (NULL);
264
265 s = *str;
266 e = s + strcspn(s, delim);
267
268 if (*e != '\0')
269 *e++ = '\0';
270 *str = e;
271
272 return (s);
273}
274
275/*
276 * Get the next non-null token (like GNU strsep). Strsep() will return a
277 * null token for two adjacent separators, so we may have to loop.
278 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000279static char *
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000280strnnsep(char **stringp, char *delim)
281{
282 char *tok;
283
284 do {
285 tok = xstrsep(stringp, delim);
286 } while (tok && *tok == '\0');
287 return (tok);
288}
289
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000290static Key *
291keygrab_ssh1(con *c)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000292{
293 static Key *rsa;
294 static Buffer msg;
295
296 if (rsa == NULL) {
297 buffer_init(&msg);
298 rsa = key_new(KEY_RSA1);
299 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000300 buffer_append(&msg, c->c_data, c->c_plen);
301 buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000302 if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000303 error("%s: invalid packet type", c->c_name);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000304 buffer_clear(&msg);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000305 return NULL;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000306 }
307 buffer_consume(&msg, 8); /* cookie */
308
309 /* server key */
310 (void) buffer_get_int(&msg);
311 buffer_get_bignum(&msg, rsa->rsa->e);
312 buffer_get_bignum(&msg, rsa->rsa->n);
313
314 /* host key */
315 (void) buffer_get_int(&msg);
316 buffer_get_bignum(&msg, rsa->rsa->e);
317 buffer_get_bignum(&msg, rsa->rsa->n);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000318
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000319 buffer_clear(&msg);
320
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000321 return (rsa);
322}
323
324static int
325hostjump(Key *hostkey)
326{
Ben Lindstrom520b55c2001-09-12 18:05:05 +0000327 kexjmp_key = hostkey;
328 longjmp(kexjmp, 1);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000329}
330
331static int
332ssh2_capable(int remote_major, int remote_minor)
333{
334 switch (remote_major) {
335 case 1:
336 if (remote_minor == 99)
337 return 1;
338 break;
339 case 2:
340 return 1;
341 default:
342 break;
343 }
344 return 0;
345}
346
347static Key *
348keygrab_ssh2(con *c)
349{
350 int j;
351
352 packet_set_connection(c->c_fd, c->c_fd);
353 enable_compat20();
354 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA?
355 "ssh-dss": "ssh-rsa";
356 c->c_kex = kex_setup(myproposal);
357 c->c_kex->verify_host_key = hostjump;
358
359 if (!(j = setjmp(kexjmp))) {
360 nonfatal_fatal = 1;
361 dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
362 fprintf(stderr, "Impossible! dispatch_run() returned!\n");
363 exit(1);
364 }
365 nonfatal_fatal = 0;
366 xfree(c->c_kex);
367 c->c_kex = NULL;
368 packet_close();
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000369
Ben Lindstrom520b55c2001-09-12 18:05:05 +0000370 return j < 0? NULL : kexjmp_key;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000371}
372
373static void
374keyprint(con *c, Key *key)
375{
376 if (!key)
377 return;
378
379 fprintf(stdout, "%s ", c->c_output_name ? c->c_output_name : c->c_name);
380 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) {
398 s = socket(ai->ai_family, SOCK_STREAM, 0);
399 if (s < 0) {
400 error("socket: %s", strerror(errno));
401 continue;
402 }
Ben Lindstrom48bd7c12001-01-09 00:35:42 +0000403 if (fcntl(s, F_SETFL, O_NONBLOCK) < 0)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000404 fatal("F_SETFL: %s", strerror(errno));
405 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{
Ben Lindstrom965710f2002-07-07 22:17:22 +0000496 int remote_major, remote_minor, 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;
Ben Lindstromde8fc6f2001-08-06 22:43:50 +0000504 while (bufsiz-- && (n = read(s, cp, 1)) == 1 && *cp != '\n') {
505 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);
Ben Lindstromd20b8552001-03-05 07:01:18 +0000546 if (atomicio(write, 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 }
570 n = read(s, c->c_data + c->c_off, c->c_len - c->c_off);
571 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
680 fatal_cleanup();
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000681}
682
683static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000684usage(void)
685{
Ben Lindstrom965710f2002-07-07 22:17:22 +0000686 fprintf(stderr, "usage: %s [-v46] [-p port] [-T timeout] [-f file]\n"
687 "\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
Kevin Stevesec84dc12000-12-13 17:45:15 +0000702 __progname = 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
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000710 while ((opt = getopt(argc, argv, "v46p:T:t:f:")) != -1) {
711 switch (opt) {
712 case 'p':
713 ssh_port = a2port(optarg);
714 if (ssh_port == 0) {
715 fprintf(stderr, "Bad port '%s'\n", optarg);
716 exit(1);
717 }
718 break;
719 case 'T':
Ben Lindstromedd098b2002-07-04 00:07:13 +0000720 timeout = convtime(optarg);
721 if (timeout == -1 || timeout == 0) {
722 fprintf(stderr, "Bad timeout '%s'\n", optarg);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000723 usage();
Ben Lindstromedd098b2002-07-04 00:07:13 +0000724 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000725 break;
726 case 'v':
727 if (!debug_flag) {
728 debug_flag = 1;
729 log_level = SYSLOG_LEVEL_DEBUG1;
730 }
731 else if (log_level < SYSLOG_LEVEL_DEBUG3)
732 log_level++;
733 else
734 fatal("Too high debugging level.");
735 break;
Kevin Steves76e7d9b2001-09-20 20:30:09 +0000736 case 'f':
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000737 if (strcmp(optarg, "-") == 0)
738 optarg = NULL;
739 argv[fopt_count++] = optarg;
740 break;
741 case 't':
742 get_keytypes = 0;
743 tname = strtok(optarg, ",");
744 while (tname) {
745 int type = key_type_from_name(tname);
746 switch (type) {
747 case KEY_RSA1:
748 get_keytypes |= KT_RSA1;
749 break;
750 case KEY_DSA:
751 get_keytypes |= KT_DSA;
752 break;
753 case KEY_RSA:
754 get_keytypes |= KT_RSA;
755 break;
756 case KEY_UNSPEC:
Ben Lindstrom28c603b2001-12-06 16:45:10 +0000757 fatal("unknown key type %s", tname);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000758 }
759 tname = strtok(NULL, ",");
760 }
761 break;
762 case '4':
763 IPv4or6 = AF_INET;
764 break;
765 case '6':
766 IPv4or6 = AF_INET6;
767 break;
768 case '?':
769 default:
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000770 usage();
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000771 }
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000772 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000773 if (optind == argc && !fopt_count)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000774 usage();
775
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000776 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000777
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000778 maxfd = fdlim_get(1);
779 if (maxfd < 0)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000780 fatal("%s: fdlim_get: bad value", __progname);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000781 if (maxfd > MAXMAXFD)
782 maxfd = MAXMAXFD;
Ben Lindstromd20b8552001-03-05 07:01:18 +0000783 if (MAXCON <= 0)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000784 fatal("%s: not enough file descriptors", __progname);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000785 if (maxfd > fdlim_get(0))
786 fdlim_set(maxfd);
787 fdcon = xmalloc(maxfd * sizeof(con));
Ben Lindstromc791beb2001-02-10 23:18:11 +0000788 memset(fdcon, 0, maxfd * sizeof(con));
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000789
Ben Lindstromc1e04212001-03-05 07:04:38 +0000790 read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask);
791 read_wait = xmalloc(read_wait_size);
792 memset(read_wait, 0, read_wait_size);
793
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000794 if (fopt_count) {
795 Linebuf *lb;
796 char *line;
797 int j;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000798
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000799 for (j = 0; j < fopt_count; j++) {
800 lb = Linebuf_alloc(argv[j], error);
Ben Lindstrom78bbd9e2001-09-12 17:10:40 +0000801 if (!lb)
802 continue;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000803 while ((line = Linebuf_getline(lb)) != NULL)
804 do_host(line);
805 Linebuf_free(lb);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000806 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000807 }
808
809 while (optind < argc)
810 do_host(argv[optind++]);
811
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000812 while (ncon > 0)
813 conloop();
814
815 return (0);
816}