blob: fb061253c101f0c349f241c2fbe57d1fef437512 [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"
Ben Lindstrom28c603b2001-12-06 16:45:10 +000010RCSID("$OpenBSD: ssh-keyscan.c,v 1.32 2001/11/22 05:27:29 stevesk Exp $");
Ben Lindstromb6434ae2000-12-05 01:15:09 +000011
Kevin Steves28a7f262001-02-05 15:43:59 +000012#if defined(HAVE_SYS_QUEUE_H) && !defined(HAVE_BOGUS_SYS_QUEUE_H)
Ben Lindstromb6434ae2000-12-05 01:15:09 +000013#include <sys/queue.h>
Kevin Steves2c65ada2000-12-06 22:25:40 +000014#else
Kevin Steves54f15b62001-03-14 18:37:13 +000015#include "openbsd-compat/fake-queue.h"
Kevin Steves2c65ada2000-12-06 22:25:40 +000016#endif
Ben Lindstromb6434ae2000-12-05 01:15:09 +000017#include <errno.h>
18
19#include <openssl/bn.h>
Ben Lindstromb6434ae2000-12-05 01:15:09 +000020
Ben Lindstrom325e70c2001-08-06 22:41:30 +000021#include <setjmp.h>
Ben Lindstromb6434ae2000-12-05 01:15:09 +000022#include "xmalloc.h"
23#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000024#include "ssh1.h"
Ben Lindstromb6434ae2000-12-05 01:15:09 +000025#include "key.h"
Ben Lindstrom325e70c2001-08-06 22:41:30 +000026#include "kex.h"
27#include "compat.h"
28#include "myproposal.h"
29#include "packet.h"
30#include "dispatch.h"
Ben Lindstromb6434ae2000-12-05 01:15:09 +000031#include "buffer.h"
32#include "bufaux.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000033#include "log.h"
Ben Lindstromd20b8552001-03-05 07:01:18 +000034#include "atomicio.h"
Ben Lindstrom325e70c2001-08-06 22:41:30 +000035#include "misc.h"
Ben Lindstromb6434ae2000-12-05 01:15:09 +000036
Ben Lindstrom325e70c2001-08-06 22:41:30 +000037/* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
38 Default value is AF_UNSPEC means both IPv4 and IPv6. */
Damien Millerefdc1f12001-11-15 08:40:45 +110039#ifdef IPV4_DEFAULT
40int IPv4or6 = AF_INET;
41#else
Ben Lindstrom325e70c2001-08-06 22:41:30 +000042int IPv4or6 = AF_UNSPEC;
Damien Millerefdc1f12001-11-15 08:40:45 +110043#endif
Ben Lindstromb6434ae2000-12-05 01:15:09 +000044
Ben Lindstrom325e70c2001-08-06 22:41:30 +000045int ssh_port = SSH_DEFAULT_PORT;
Kevin Steves76e7d9b2001-09-20 20:30:09 +000046
47#define KT_RSA1 1
48#define KT_DSA 2
49#define KT_RSA 4
50
51int get_keytypes = KT_RSA1; /* Get only RSA1 keys by default */
Ben Lindstromb6434ae2000-12-05 01:15:09 +000052
Ben Lindstromb6434ae2000-12-05 01:15:09 +000053#define MAXMAXFD 256
54
55/* The number of seconds after which to give up on a TCP connection */
56int timeout = 5;
57
58int maxfd;
Ben Lindstromd20b8552001-03-05 07:01:18 +000059#define MAXCON (maxfd - 10)
Ben Lindstromb6434ae2000-12-05 01:15:09 +000060
Kevin Stevesec84dc12000-12-13 17:45:15 +000061#ifdef HAVE___PROGNAME
62extern char *__progname;
63#else
64char *__progname;
65#endif
Ben Lindstromc1e04212001-03-05 07:04:38 +000066fd_set *read_wait;
67size_t read_wait_size;
Ben Lindstromb6434ae2000-12-05 01:15:09 +000068int ncon;
Ben Lindstrom325e70c2001-08-06 22:41:30 +000069int nonfatal_fatal = 0;
70jmp_buf kexjmp;
Ben Lindstrom520b55c2001-09-12 18:05:05 +000071Key *kexjmp_key;
Ben Lindstromb6434ae2000-12-05 01:15:09 +000072
73/*
74 * Keep a connection structure for each file descriptor. The state
75 * associated with file descriptor n is held in fdcon[n].
76 */
77typedef struct Connection {
Ben Lindstrom46c16222000-12-22 01:43:59 +000078 u_char c_status; /* State of connection on this file desc. */
Ben Lindstromb6434ae2000-12-05 01:15:09 +000079#define CS_UNUSED 0 /* File descriptor unused */
80#define CS_CON 1 /* Waiting to connect/read greeting */
81#define CS_SIZE 2 /* Waiting to read initial packet size */
82#define CS_KEYS 3 /* Waiting to read public key packet */
83 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
84 int c_plen; /* Packet length field for ssh packet */
85 int c_len; /* Total bytes which must be read. */
86 int c_off; /* Length of data read so far. */
Ben Lindstrom325e70c2001-08-06 22:41:30 +000087 int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
Ben Lindstromb6434ae2000-12-05 01:15:09 +000088 char *c_namebase; /* Address to free for c_name and c_namelist */
89 char *c_name; /* Hostname of connection for errors */
90 char *c_namelist; /* Pointer to other possible addresses */
91 char *c_output_name; /* Hostname of connection for output */
92 char *c_data; /* Data read from this fd */
Ben Lindstrom325e70c2001-08-06 22:41:30 +000093 Kex *c_kex; /* The key-exchange struct for ssh2 */
Ben Lindstromb6434ae2000-12-05 01:15:09 +000094 struct timeval c_tv; /* Time at which connection gets aborted */
95 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
96} con;
97
98TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
99con *fdcon;
100
101/*
102 * This is just a wrapper around fgets() to make it usable.
103 */
104
105/* Stress-test. Increase this later. */
106#define LINEBUF_SIZE 16
107
108typedef struct {
109 char *buf;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000110 u_int size;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000111 int lineno;
112 const char *filename;
113 FILE *stream;
114 void (*errfun) (const char *,...);
115} Linebuf;
116
Ben Lindstrombba81212001-06-25 05:01:22 +0000117static Linebuf *
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000118Linebuf_alloc(const char *filename, void (*errfun) (const char *,...))
119{
120 Linebuf *lb;
121
122 if (!(lb = malloc(sizeof(*lb)))) {
123 if (errfun)
124 (*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
125 return (NULL);
126 }
127 if (filename) {
128 lb->filename = filename;
129 if (!(lb->stream = fopen(filename, "r"))) {
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000130 xfree(lb);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000131 if (errfun)
132 (*errfun) ("%s: %s\n", filename, strerror(errno));
133 return (NULL);
134 }
135 } else {
136 lb->filename = "(stdin)";
137 lb->stream = stdin;
138 }
139
140 if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) {
141 if (errfun)
142 (*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000143 xfree(lb);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000144 return (NULL);
145 }
146 lb->errfun = errfun;
147 lb->lineno = 0;
148 return (lb);
149}
150
Ben Lindstrombba81212001-06-25 05:01:22 +0000151static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000152Linebuf_free(Linebuf * lb)
153{
154 fclose(lb->stream);
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000155 xfree(lb->buf);
156 xfree(lb);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000157}
158
Ben Lindstrombba81212001-06-25 05:01:22 +0000159#if 0
160static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000161Linebuf_restart(Linebuf * lb)
162{
163 clearerr(lb->stream);
164 rewind(lb->stream);
165 lb->lineno = 0;
166}
167
Ben Lindstrombba81212001-06-25 05:01:22 +0000168static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000169Linebuf_lineno(Linebuf * lb)
170{
171 return (lb->lineno);
172}
Ben Lindstrombba81212001-06-25 05:01:22 +0000173#endif
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000174
Ben Lindstrombba81212001-06-25 05:01:22 +0000175static char *
Ben Lindstromc791beb2001-02-10 23:18:11 +0000176Linebuf_getline(Linebuf * lb)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000177{
178 int n = 0;
179
180 lb->lineno++;
181 for (;;) {
182 /* Read a line */
183 if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
184 if (ferror(lb->stream) && lb->errfun)
Ben Lindstromb0a4cd82001-03-05 04:54:49 +0000185 (*lb->errfun) ("%s: %s\n", lb->filename,
186 strerror(errno));
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000187 return (NULL);
188 }
189 n = strlen(lb->buf);
190
191 /* Return it or an error if it fits */
192 if (n > 0 && lb->buf[n - 1] == '\n') {
193 lb->buf[n - 1] = '\0';
194 return (lb->buf);
195 }
196 if (n != lb->size - 1) {
197 if (lb->errfun)
Ben Lindstromb0a4cd82001-03-05 04:54:49 +0000198 (*lb->errfun) ("%s: skipping incomplete last line\n",
199 lb->filename);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000200 return (NULL);
201 }
202 /* Double the buffer if we need more space */
203 if (!(lb->buf = realloc(lb->buf, (lb->size *= 2)))) {
204 if (lb->errfun)
Ben Lindstromb0a4cd82001-03-05 04:54:49 +0000205 (*lb->errfun) ("linebuf (%s): realloc failed\n",
206 lb->filename);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000207 return (NULL);
208 }
209 }
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 Lindstromb6434ae2000-12-05 01:15:09 +0000237 if (lim <= 0)
238 return (-1);
Ben Lindstrom5adbad22000-12-27 07:06:21 +0000239#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000240 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
241 return (-1);
242 rlfd.rlim_cur = lim;
243 if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
244 return (-1);
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000245#elif defined (HAVE_SETDTABLESIZE)
Kevin Steves28a7f262001-02-05 15:43:59 +0000246 setdtablesize(lim);
Ben Lindstrom2c467a22000-12-27 04:57:41 +0000247#endif
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000248 return (0);
249}
250
251/*
252 * This is an strsep function that returns a null field for adjacent
253 * separators. This is the same as the 4.4BSD strsep, but different from the
254 * one in the GNU libc.
255 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000256static char *
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000257xstrsep(char **str, const char *delim)
258{
259 char *s, *e;
260
261 if (!**str)
262 return (NULL);
263
264 s = *str;
265 e = s + strcspn(s, delim);
266
267 if (*e != '\0')
268 *e++ = '\0';
269 *str = e;
270
271 return (s);
272}
273
274/*
275 * Get the next non-null token (like GNU strsep). Strsep() will return a
276 * null token for two adjacent separators, so we may have to loop.
277 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000278static char *
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000279strnnsep(char **stringp, char *delim)
280{
281 char *tok;
282
283 do {
284 tok = xstrsep(stringp, delim);
285 } while (tok && *tok == '\0');
286 return (tok);
287}
288
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000289static Key *
290keygrab_ssh1(con *c)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000291{
292 static Key *rsa;
293 static Buffer msg;
294
295 if (rsa == NULL) {
296 buffer_init(&msg);
297 rsa = key_new(KEY_RSA1);
298 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000299 buffer_append(&msg, c->c_data, c->c_plen);
300 buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000301 if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000302 error("%s: invalid packet type", c->c_name);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000303 buffer_clear(&msg);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000304 return NULL;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000305 }
306 buffer_consume(&msg, 8); /* cookie */
307
308 /* server key */
309 (void) buffer_get_int(&msg);
310 buffer_get_bignum(&msg, rsa->rsa->e);
311 buffer_get_bignum(&msg, rsa->rsa->n);
312
313 /* host key */
314 (void) buffer_get_int(&msg);
315 buffer_get_bignum(&msg, rsa->rsa->e);
316 buffer_get_bignum(&msg, rsa->rsa->n);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000317
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000318 buffer_clear(&msg);
319
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000320 return (rsa);
321}
322
323static int
324hostjump(Key *hostkey)
325{
Ben Lindstrom520b55c2001-09-12 18:05:05 +0000326 kexjmp_key = hostkey;
327 longjmp(kexjmp, 1);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000328}
329
330static int
331ssh2_capable(int remote_major, int remote_minor)
332{
333 switch (remote_major) {
334 case 1:
335 if (remote_minor == 99)
336 return 1;
337 break;
338 case 2:
339 return 1;
340 default:
341 break;
342 }
343 return 0;
344}
345
346static Key *
347keygrab_ssh2(con *c)
348{
349 int j;
350
351 packet_set_connection(c->c_fd, c->c_fd);
352 enable_compat20();
353 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA?
354 "ssh-dss": "ssh-rsa";
355 c->c_kex = kex_setup(myproposal);
356 c->c_kex->verify_host_key = hostjump;
357
358 if (!(j = setjmp(kexjmp))) {
359 nonfatal_fatal = 1;
360 dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
361 fprintf(stderr, "Impossible! dispatch_run() returned!\n");
362 exit(1);
363 }
364 nonfatal_fatal = 0;
365 xfree(c->c_kex);
366 c->c_kex = NULL;
367 packet_close();
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000368
Ben Lindstrom520b55c2001-09-12 18:05:05 +0000369 return j < 0? NULL : kexjmp_key;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000370}
371
372static void
373keyprint(con *c, Key *key)
374{
375 if (!key)
376 return;
377
378 fprintf(stdout, "%s ", c->c_output_name ? c->c_output_name : c->c_name);
379 key_write(key, stdout);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000380 fputs("\n", stdout);
381}
382
Ben Lindstrombba81212001-06-25 05:01:22 +0000383static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000384tcpconnect(char *host)
385{
386 struct addrinfo hints, *ai, *aitop;
387 char strport[NI_MAXSERV];
388 int gaierr, s = -1;
389
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000390 snprintf(strport, sizeof strport, "%d", ssh_port);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000391 memset(&hints, 0, sizeof(hints));
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000392 hints.ai_family = IPv4or6;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000393 hints.ai_socktype = SOCK_STREAM;
394 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
395 fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
396 for (ai = aitop; ai; ai = ai->ai_next) {
397 s = socket(ai->ai_family, SOCK_STREAM, 0);
398 if (s < 0) {
399 error("socket: %s", strerror(errno));
400 continue;
401 }
Ben Lindstrom48bd7c12001-01-09 00:35:42 +0000402 if (fcntl(s, F_SETFL, O_NONBLOCK) < 0)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000403 fatal("F_SETFL: %s", strerror(errno));
404 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
405 errno != EINPROGRESS)
406 error("connect (`%s'): %s", host, strerror(errno));
407 else
408 break;
409 close(s);
410 s = -1;
411 }
412 freeaddrinfo(aitop);
413 return s;
414}
415
Ben Lindstrombba81212001-06-25 05:01:22 +0000416static int
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000417conalloc(char *iname, char *oname, int keytype)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000418{
419 int s;
420 char *namebase, *name, *namelist;
421
422 namebase = namelist = xstrdup(iname);
423
424 do {
425 name = xstrsep(&namelist, ",");
426 if (!name) {
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000427 xfree(namebase);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000428 return (-1);
429 }
430 } while ((s = tcpconnect(name)) < 0);
431
432 if (s >= maxfd)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000433 fatal("conalloc: fdno %d too high", s);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000434 if (fdcon[s].c_status)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000435 fatal("conalloc: attempt to reuse fdno %d", s);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000436
437 fdcon[s].c_fd = s;
438 fdcon[s].c_status = CS_CON;
439 fdcon[s].c_namebase = namebase;
440 fdcon[s].c_name = name;
441 fdcon[s].c_namelist = namelist;
442 fdcon[s].c_output_name = xstrdup(oname);
443 fdcon[s].c_data = (char *) &fdcon[s].c_plen;
444 fdcon[s].c_len = 4;
445 fdcon[s].c_off = 0;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000446 fdcon[s].c_keytype = keytype;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000447 gettimeofday(&fdcon[s].c_tv, NULL);
448 fdcon[s].c_tv.tv_sec += timeout;
449 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
Ben Lindstromc1e04212001-03-05 07:04:38 +0000450 FD_SET(s, read_wait);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000451 ncon++;
452 return (s);
453}
454
Ben Lindstrombba81212001-06-25 05:01:22 +0000455static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000456confree(int s)
457{
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000458 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000459 fatal("confree: attempt to free bad fdno %d", s);
Ben Lindstromd20b8552001-03-05 07:01:18 +0000460 close(s);
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000461 xfree(fdcon[s].c_namebase);
462 xfree(fdcon[s].c_output_name);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000463 if (fdcon[s].c_status == CS_KEYS)
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000464 xfree(fdcon[s].c_data);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000465 fdcon[s].c_status = CS_UNUSED;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000466 fdcon[s].c_keytype = 0;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000467 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
Ben Lindstromc1e04212001-03-05 07:04:38 +0000468 FD_CLR(s, read_wait);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000469 ncon--;
470}
471
Ben Lindstrombba81212001-06-25 05:01:22 +0000472static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000473contouch(int s)
474{
475 TAILQ_REMOVE(&tq, &fdcon[s], c_link);
476 gettimeofday(&fdcon[s].c_tv, NULL);
477 fdcon[s].c_tv.tv_sec += timeout;
478 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
479}
480
Ben Lindstrombba81212001-06-25 05:01:22 +0000481static int
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000482conrecycle(int s)
483{
484 int ret;
485 con *c = &fdcon[s];
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000486
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000487 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000488 confree(s);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000489 return (ret);
490}
491
Ben Lindstrombba81212001-06-25 05:01:22 +0000492static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000493congreet(int s)
494{
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000495 char buf[256], *cp;
Ben Lindstrom884a4ac2001-03-06 03:33:04 +0000496 size_t bufsiz;
Ben Lindstrome21c4ad2001-03-07 01:23:30 +0000497 int n = 0;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000498 con *c = &fdcon[s];
499
Ben Lindstrom884a4ac2001-03-06 03:33:04 +0000500 bufsiz = sizeof(buf);
501 cp = buf;
Ben Lindstromde8fc6f2001-08-06 22:43:50 +0000502 while (bufsiz-- && (n = read(s, cp, 1)) == 1 && *cp != '\n') {
503 if (*cp == '\r')
504 *cp = '\n';
Ben Lindstrom884a4ac2001-03-06 03:33:04 +0000505 cp++;
Ben Lindstromde8fc6f2001-08-06 22:43:50 +0000506 }
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000507 if (n < 0) {
508 if (errno != ECONNREFUSED)
509 error("read (%s): %s", c->c_name, strerror(errno));
510 conrecycle(s);
511 return;
512 }
Ben Lindstrom884a4ac2001-03-06 03:33:04 +0000513 if (*cp != '\n' && *cp != '\r') {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000514 error("%s: bad greeting", c->c_name);
515 confree(s);
516 return;
517 }
Ben Lindstrom884a4ac2001-03-06 03:33:04 +0000518 *cp = '\0';
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000519 if (c->c_keytype != KT_RSA1) {
520 int remote_major, remote_minor;
521 char remote_version[sizeof buf];
522
523 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
524 &remote_major, &remote_minor, remote_version) == 3)
525 compat_datafellows(remote_version);
526 else
527 datafellows = 0;
528 if (!ssh2_capable(remote_major, remote_minor)) {
529 debug("%s doesn't support ssh2", c->c_name);
530 confree(s);
531 return;
532 }
533 }
Ben Lindstromde8fc6f2001-08-06 22:43:50 +0000534 fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000535 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
536 c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
537 c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
Ben Lindstromd20b8552001-03-05 07:01:18 +0000538 if (atomicio(write, s, buf, n) != n) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000539 error("write (%s): %s", c->c_name, strerror(errno));
540 confree(s);
541 return;
542 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000543 if (c->c_keytype != KT_RSA1) {
544 keyprint(c, keygrab_ssh2(c));
545 confree(s);
546 return;
547 }
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000548 c->c_status = CS_SIZE;
549 contouch(s);
550}
551
Ben Lindstrombba81212001-06-25 05:01:22 +0000552static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000553conread(int s)
554{
555 int n;
556 con *c = &fdcon[s];
557
558 if (c->c_status == CS_CON) {
559 congreet(s);
560 return;
561 }
562 n = read(s, c->c_data + c->c_off, c->c_len - c->c_off);
563 if (n < 0) {
564 error("read (%s): %s", c->c_name, strerror(errno));
565 confree(s);
566 return;
567 }
568 c->c_off += n;
569
570 if (c->c_off == c->c_len)
571 switch (c->c_status) {
572 case CS_SIZE:
573 c->c_plen = htonl(c->c_plen);
574 c->c_len = c->c_plen + 8 - (c->c_plen & 7);
575 c->c_off = 0;
576 c->c_data = xmalloc(c->c_len);
577 c->c_status = CS_KEYS;
578 break;
579 case CS_KEYS:
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000580 keyprint(c, keygrab_ssh1(c));
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000581 confree(s);
582 return;
583 break;
584 default:
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000585 fatal("conread: invalid status %d", c->c_status);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000586 break;
587 }
588
589 contouch(s);
590}
591
Ben Lindstrombba81212001-06-25 05:01:22 +0000592static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000593conloop(void)
594{
Ben Lindstromc1e04212001-03-05 07:04:38 +0000595 fd_set *r, *e;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000596 struct timeval seltime, now;
597 int i;
598 con *c;
599
600 gettimeofday(&now, NULL);
601 c = tq.tqh_first;
602
Ben Lindstromd20b8552001-03-05 07:01:18 +0000603 if (c && (c->c_tv.tv_sec > now.tv_sec ||
604 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000605 seltime = c->c_tv;
606 seltime.tv_sec -= now.tv_sec;
607 seltime.tv_usec -= now.tv_usec;
Ben Lindstromc791beb2001-02-10 23:18:11 +0000608 if (seltime.tv_usec < 0) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000609 seltime.tv_usec += 1000000;
610 seltime.tv_sec--;
611 }
612 } else
613 seltime.tv_sec = seltime.tv_usec = 0;
614
Ben Lindstromc1e04212001-03-05 07:04:38 +0000615 r = xmalloc(read_wait_size);
616 memcpy(r, read_wait, read_wait_size);
617 e = xmalloc(read_wait_size);
618 memcpy(e, read_wait, read_wait_size);
619
620 while (select(maxfd, r, NULL, e, &seltime) == -1 &&
Ben Lindstromf9452512001-02-15 03:12:08 +0000621 (errno == EAGAIN || errno == EINTR))
622 ;
623
Ben Lindstromd20b8552001-03-05 07:01:18 +0000624 for (i = 0; i < maxfd; i++) {
Ben Lindstromc1e04212001-03-05 07:04:38 +0000625 if (FD_ISSET(i, e)) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000626 error("%s: exception!", fdcon[i].c_name);
627 confree(i);
Ben Lindstromc1e04212001-03-05 07:04:38 +0000628 } else if (FD_ISSET(i, r))
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000629 conread(i);
Ben Lindstromd20b8552001-03-05 07:01:18 +0000630 }
Ben Lindstromc1e04212001-03-05 07:04:38 +0000631 xfree(r);
632 xfree(e);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000633
634 c = tq.tqh_first;
Ben Lindstromd20b8552001-03-05 07:01:18 +0000635 while (c && (c->c_tv.tv_sec < now.tv_sec ||
636 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000637 int s = c->c_fd;
Ben Lindstromd20b8552001-03-05 07:01:18 +0000638
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000639 c = c->c_link.tqe_next;
640 conrecycle(s);
641 }
642}
643
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000644static void
645do_host(char *host)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000646{
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000647 char *name = strnnsep(&host, " \t\n");
648 int j;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000649
Ben Lindstromeaffb9d2001-12-06 16:28:19 +0000650 if (name == NULL)
651 return;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000652 for (j = KT_RSA1; j <= KT_RSA; j *= 2) {
653 if (get_keytypes & j) {
654 while (ncon >= MAXCON)
655 conloop();
656 conalloc(name, *host ? host : name, j);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000657 }
658 }
659}
660
Ben Lindstrombba81212001-06-25 05:01:22 +0000661static void
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000662fatal_callback(void *arg)
663{
664 if (nonfatal_fatal)
665 longjmp(kexjmp, -1);
666}
667
668static void
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000669usage(void)
670{
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000671 fprintf(stderr, "Usage: %s [options] host ...\n",
Ben Lindstromddfb1e32001-08-06 22:06:35 +0000672 __progname);
673 fprintf(stderr, "Options:\n");
Ben Lindstromddfb1e32001-08-06 22:06:35 +0000674 fprintf(stderr, " -f file Read hosts or addresses from file.\n");
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000675 fprintf(stderr, " -p port Connect to the specified port.\n");
676 fprintf(stderr, " -t keytype Specify the host key type.\n");
677 fprintf(stderr, " -T timeout Set connection timeout.\n");
Kevin Steves76e7d9b2001-09-20 20:30:09 +0000678 fprintf(stderr, " -v Verbose; display verbose debugging messages.\n");
679 fprintf(stderr, " -4 Use IPv4 only.\n");
680 fprintf(stderr, " -6 Use IPv6 only.\n");
Ben Lindstromddfb1e32001-08-06 22:06:35 +0000681 exit(1);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000682}
683
684int
685main(int argc, char **argv)
686{
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000687 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
688 int opt, fopt_count = 0;
689 char *tname;
Kevin Steves76e7d9b2001-09-20 20:30:09 +0000690
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000691 extern int optind;
692 extern char *optarg;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000693
Kevin Stevesec84dc12000-12-13 17:45:15 +0000694 __progname = get_progname(argv[0]);
Ben Lindstrom4e088e42001-10-10 20:45:43 +0000695 init_rng();
696 seed_rng();
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000697 TAILQ_INIT(&tq);
698
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000699 if (argc <= 1)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000700 usage();
701
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000702 while ((opt = getopt(argc, argv, "v46p:T:t:f:")) != -1) {
703 switch (opt) {
704 case 'p':
705 ssh_port = a2port(optarg);
706 if (ssh_port == 0) {
707 fprintf(stderr, "Bad port '%s'\n", optarg);
708 exit(1);
709 }
710 break;
711 case 'T':
712 timeout = atoi(optarg);
713 if (timeout <= 0)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000714 usage();
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000715 break;
716 case 'v':
717 if (!debug_flag) {
718 debug_flag = 1;
719 log_level = SYSLOG_LEVEL_DEBUG1;
720 }
721 else if (log_level < SYSLOG_LEVEL_DEBUG3)
722 log_level++;
723 else
724 fatal("Too high debugging level.");
725 break;
Kevin Steves76e7d9b2001-09-20 20:30:09 +0000726 case 'f':
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000727 if (strcmp(optarg, "-") == 0)
728 optarg = NULL;
729 argv[fopt_count++] = optarg;
730 break;
731 case 't':
732 get_keytypes = 0;
733 tname = strtok(optarg, ",");
734 while (tname) {
735 int type = key_type_from_name(tname);
736 switch (type) {
737 case KEY_RSA1:
738 get_keytypes |= KT_RSA1;
739 break;
740 case KEY_DSA:
741 get_keytypes |= KT_DSA;
742 break;
743 case KEY_RSA:
744 get_keytypes |= KT_RSA;
745 break;
746 case KEY_UNSPEC:
Ben Lindstrom28c603b2001-12-06 16:45:10 +0000747 fatal("unknown key type %s", tname);
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000748 }
749 tname = strtok(NULL, ",");
750 }
751 break;
752 case '4':
753 IPv4or6 = AF_INET;
754 break;
755 case '6':
756 IPv4or6 = AF_INET6;
757 break;
758 case '?':
759 default:
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000760 usage();
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000761 }
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000762 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000763 if (optind == argc && !fopt_count)
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000764 usage();
765
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000766 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
767 fatal_add_cleanup(fatal_callback, NULL);
768
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000769 maxfd = fdlim_get(1);
770 if (maxfd < 0)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000771 fatal("%s: fdlim_get: bad value", __progname);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000772 if (maxfd > MAXMAXFD)
773 maxfd = MAXMAXFD;
Ben Lindstromd20b8552001-03-05 07:01:18 +0000774 if (MAXCON <= 0)
Kevin Stevesfa72dda2000-12-15 18:39:12 +0000775 fatal("%s: not enough file descriptors", __progname);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000776 if (maxfd > fdlim_get(0))
777 fdlim_set(maxfd);
778 fdcon = xmalloc(maxfd * sizeof(con));
Ben Lindstromc791beb2001-02-10 23:18:11 +0000779 memset(fdcon, 0, maxfd * sizeof(con));
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000780
Ben Lindstromc1e04212001-03-05 07:04:38 +0000781 read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask);
782 read_wait = xmalloc(read_wait_size);
783 memset(read_wait, 0, read_wait_size);
784
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000785 if (fopt_count) {
786 Linebuf *lb;
787 char *line;
788 int j;
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000789
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000790 for (j = 0; j < fopt_count; j++) {
791 lb = Linebuf_alloc(argv[j], error);
Ben Lindstrom78bbd9e2001-09-12 17:10:40 +0000792 if (!lb)
793 continue;
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000794 while ((line = Linebuf_getline(lb)) != NULL)
795 do_host(line);
796 Linebuf_free(lb);
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000797 }
Ben Lindstrom325e70c2001-08-06 22:41:30 +0000798 }
799
800 while (optind < argc)
801 do_host(argv[optind++]);
802
Ben Lindstromb6434ae2000-12-05 01:15:09 +0000803 while (ncon > 0)
804 conloop();
805
806 return (0);
807}