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77261db4 | 1 | /* $OpenBSD: ssh-agent.c,v 1.63 2001/07/04 23:39:07 markus Exp $ */ |
dae3fa13 | 2 | |
8efc0c15 | 3 | /* |
5260325f | 4 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
6 | * All rights reserved | |
5260325f | 7 | * The authentication agent program. |
2e73a022 | 8 | * |
bcbf86ec | 9 | * As far as I am concerned, the code I have written for this software |
10 | * can be used freely for any purpose. Any derived versions of this | |
11 | * software must be clearly marked as such, and if the derived work is | |
12 | * incompatible with the protocol description in the RFC file, it must be | |
13 | * called by a name other than "ssh" or "Secure Shell". | |
14 | * | |
a96070d4 | 15 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
bcbf86ec | 16 | * |
17 | * Redistribution and use in source and binary forms, with or without | |
18 | * modification, are permitted provided that the following conditions | |
19 | * are met: | |
20 | * 1. Redistributions of source code must retain the above copyright | |
21 | * notice, this list of conditions and the following disclaimer. | |
22 | * 2. Redistributions in binary form must reproduce the above copyright | |
23 | * notice, this list of conditions and the following disclaimer in the | |
24 | * documentation and/or other materials provided with the distribution. | |
25 | * | |
26 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
27 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
28 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
29 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
30 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
31 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
32 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
33 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
34 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
35 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 36 | */ |
8efc0c15 | 37 | |
38 | #include "includes.h" | |
77261db4 | 39 | RCSID("$OpenBSD: ssh-agent.c,v 1.63 2001/07/04 23:39:07 markus Exp $"); |
42f11eb2 | 40 | |
41 | #include <openssl/evp.h> | |
42 | #include <openssl/md5.h> | |
8efc0c15 | 43 | |
44 | #include "ssh.h" | |
45 | #include "rsa.h" | |
8efc0c15 | 46 | #include "buffer.h" |
47 | #include "bufaux.h" | |
48 | #include "xmalloc.h" | |
49 | #include "packet.h" | |
50 | #include "getput.h" | |
51 | #include "mpaux.h" | |
4c8722d9 | 52 | #include "key.h" |
53 | #include "authfd.h" | |
42f11eb2 | 54 | #include "cipher.h" |
2e73a022 | 55 | #include "kex.h" |
188adeb2 | 56 | #include "compat.h" |
42f11eb2 | 57 | #include "log.h" |
8efc0c15 | 58 | |
2b5fe3b8 | 59 | #ifdef SMARTCARD |
60 | #include <openssl/engine.h> | |
61 | #include "scard.h" | |
62 | #endif | |
63 | ||
5260325f | 64 | typedef struct { |
65 | int fd; | |
66 | enum { | |
67 | AUTH_UNUSED, AUTH_SOCKET, AUTH_CONNECTION | |
68 | } type; | |
69 | Buffer input; | |
70 | Buffer output; | |
8efc0c15 | 71 | } SocketEntry; |
72 | ||
1e3b8b07 | 73 | u_int sockets_alloc = 0; |
8efc0c15 | 74 | SocketEntry *sockets = NULL; |
75 | ||
5260325f | 76 | typedef struct { |
2e73a022 | 77 | Key *key; |
5260325f | 78 | char *comment; |
8efc0c15 | 79 | } Identity; |
80 | ||
2e73a022 | 81 | typedef struct { |
82 | int nentries; | |
83 | Identity *identities; | |
84 | } Idtab; | |
85 | ||
86 | /* private key table, one per protocol version */ | |
87 | Idtab idtable[3]; | |
8efc0c15 | 88 | |
89 | int max_fd = 0; | |
90 | ||
91 | /* pid of shell == parent of agent */ | |
9da5c3c9 | 92 | pid_t parent_pid = -1; |
8efc0c15 | 93 | |
94 | /* pathname and directory for AUTH_SOCKET */ | |
95 | char socket_name[1024]; | |
96 | char socket_dir[1024]; | |
97 | ||
5260325f | 98 | #ifdef HAVE___PROGNAME |
99 | extern char *__progname; | |
260d427b | 100 | #else |
101 | char *__progname; | |
102 | #endif | |
5260325f | 103 | |
396c147e | 104 | static void |
2e73a022 | 105 | idtab_init(void) |
106 | { | |
107 | int i; | |
108 | for (i = 0; i <=2; i++){ | |
109 | idtable[i].identities = NULL; | |
110 | idtable[i].nentries = 0; | |
111 | } | |
112 | } | |
113 | ||
114 | /* return private key table for requested protocol version */ | |
396c147e | 115 | static Idtab * |
2e73a022 | 116 | idtab_lookup(int version) |
117 | { | |
118 | if (version < 1 || version > 2) | |
119 | fatal("internal error, bad protocol version %d", version); | |
120 | return &idtable[version]; | |
121 | } | |
122 | ||
123 | /* return matching private key for given public key */ | |
396c147e | 124 | static Key * |
2e73a022 | 125 | lookup_private_key(Key *key, int *idx, int version) |
126 | { | |
127 | int i; | |
128 | Idtab *tab = idtab_lookup(version); | |
129 | for (i = 0; i < tab->nentries; i++) { | |
130 | if (key_equal(key, tab->identities[i].key)) { | |
131 | if (idx != NULL) | |
132 | *idx = i; | |
133 | return tab->identities[i].key; | |
134 | } | |
135 | } | |
136 | return NULL; | |
137 | } | |
138 | ||
139 | /* send list of supported public keys to 'client' */ | |
396c147e | 140 | static void |
2e73a022 | 141 | process_request_identities(SocketEntry *e, int version) |
8efc0c15 | 142 | { |
2e73a022 | 143 | Idtab *tab = idtab_lookup(version); |
5260325f | 144 | Buffer msg; |
145 | int i; | |
146 | ||
147 | buffer_init(&msg); | |
2e73a022 | 148 | buffer_put_char(&msg, (version == 1) ? |
149 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); | |
150 | buffer_put_int(&msg, tab->nentries); | |
151 | for (i = 0; i < tab->nentries; i++) { | |
152 | Identity *id = &tab->identities[i]; | |
fa08c86b | 153 | if (id->key->type == KEY_RSA1) { |
2e73a022 | 154 | buffer_put_int(&msg, BN_num_bits(id->key->rsa->n)); |
155 | buffer_put_bignum(&msg, id->key->rsa->e); | |
156 | buffer_put_bignum(&msg, id->key->rsa->n); | |
157 | } else { | |
1e3b8b07 | 158 | u_char *blob; |
159 | u_int blen; | |
fa08c86b | 160 | key_to_blob(id->key, &blob, &blen); |
2e73a022 | 161 | buffer_put_string(&msg, blob, blen); |
162 | xfree(blob); | |
163 | } | |
164 | buffer_put_cstring(&msg, id->comment); | |
5260325f | 165 | } |
166 | buffer_put_int(&e->output, buffer_len(&msg)); | |
167 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
168 | buffer_free(&msg); | |
8efc0c15 | 169 | } |
170 | ||
2e73a022 | 171 | /* ssh1 only */ |
396c147e | 172 | static void |
2e73a022 | 173 | process_authentication_challenge1(SocketEntry *e) |
8efc0c15 | 174 | { |
2e73a022 | 175 | Key *key, *private; |
176 | BIGNUM *challenge; | |
177 | int i, len; | |
5260325f | 178 | Buffer msg; |
179 | MD5_CTX md; | |
1e3b8b07 | 180 | u_char buf[32], mdbuf[16], session_id[16]; |
181 | u_int response_type; | |
5260325f | 182 | |
183 | buffer_init(&msg); | |
fa08c86b | 184 | key = key_new(KEY_RSA1); |
5260325f | 185 | challenge = BN_new(); |
5260325f | 186 | |
2e73a022 | 187 | buffer_get_int(&e->input); /* ignored */ |
188 | buffer_get_bignum(&e->input, key->rsa->e); | |
189 | buffer_get_bignum(&e->input, key->rsa->n); | |
190 | buffer_get_bignum(&e->input, challenge); | |
5260325f | 191 | |
2e73a022 | 192 | /* Only protocol 1.1 is supported */ |
193 | if (buffer_len(&e->input) == 0) | |
194 | goto failure; | |
195 | buffer_get(&e->input, (char *) session_id, 16); | |
196 | response_type = buffer_get_int(&e->input); | |
197 | if (response_type != 1) | |
198 | goto failure; | |
199 | ||
200 | private = lookup_private_key(key, NULL, 1); | |
201 | if (private != NULL) { | |
202 | /* Decrypt the challenge using the private key. */ | |
46aa2d1f | 203 | if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0) |
204 | goto failure; | |
2e73a022 | 205 | |
206 | /* The response is MD5 of decrypted challenge plus session id. */ | |
207 | len = BN_num_bytes(challenge); | |
208 | if (len <= 0 || len > 32) { | |
209 | log("process_authentication_challenge: bad challenge length %d", len); | |
210 | goto failure; | |
5260325f | 211 | } |
2e73a022 | 212 | memset(buf, 0, 32); |
213 | BN_bn2bin(challenge, buf + 32 - len); | |
214 | MD5_Init(&md); | |
215 | MD5_Update(&md, buf, 32); | |
216 | MD5_Update(&md, session_id, 16); | |
217 | MD5_Final(mdbuf, &md); | |
218 | ||
219 | /* Send the response. */ | |
220 | buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE); | |
221 | for (i = 0; i < 16; i++) | |
222 | buffer_put_char(&msg, mdbuf[i]); | |
223 | goto send; | |
224 | } | |
225 | ||
226 | failure: | |
227 | /* Unknown identity or protocol error. Send failure. */ | |
5260325f | 228 | buffer_put_char(&msg, SSH_AGENT_FAILURE); |
229 | send: | |
2e73a022 | 230 | buffer_put_int(&e->output, buffer_len(&msg)); |
231 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); | |
232 | key_free(key); | |
233 | BN_clear_free(challenge); | |
234 | buffer_free(&msg); | |
235 | } | |
236 | ||
237 | /* ssh2 only */ | |
396c147e | 238 | static void |
2e73a022 | 239 | process_sign_request2(SocketEntry *e) |
240 | { | |
241 | extern int datafellows; | |
242 | Key *key, *private; | |
1e3b8b07 | 243 | u_char *blob, *data, *signature = NULL; |
244 | u_int blen, dlen, slen = 0; | |
188adeb2 | 245 | int flags; |
2e73a022 | 246 | Buffer msg; |
247 | int ok = -1; | |
248 | ||
249 | datafellows = 0; | |
227e8e86 | 250 | |
2e73a022 | 251 | blob = buffer_get_string(&e->input, &blen); |
252 | data = buffer_get_string(&e->input, &dlen); | |
188adeb2 | 253 | |
254 | flags = buffer_get_int(&e->input); | |
255 | if (flags & SSH_AGENT_OLD_SIGNATURE) | |
256 | datafellows = SSH_BUG_SIGBLOB; | |
2e73a022 | 257 | |
fa08c86b | 258 | key = key_from_blob(blob, blen); |
2e73a022 | 259 | if (key != NULL) { |
260 | private = lookup_private_key(key, NULL, 2); | |
261 | if (private != NULL) | |
fa08c86b | 262 | ok = key_sign(private, &signature, &slen, data, dlen); |
2e73a022 | 263 | } |
264 | key_free(key); | |
265 | buffer_init(&msg); | |
266 | if (ok == 0) { | |
267 | buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE); | |
268 | buffer_put_string(&msg, signature, slen); | |
269 | } else { | |
270 | buffer_put_char(&msg, SSH_AGENT_FAILURE); | |
271 | } | |
5260325f | 272 | buffer_put_int(&e->output, buffer_len(&msg)); |
273 | buffer_append(&e->output, buffer_ptr(&msg), | |
2e73a022 | 274 | buffer_len(&msg)); |
5260325f | 275 | buffer_free(&msg); |
2e73a022 | 276 | xfree(data); |
277 | xfree(blob); | |
278 | if (signature != NULL) | |
279 | xfree(signature); | |
8efc0c15 | 280 | } |
281 | ||
2e73a022 | 282 | /* shared */ |
396c147e | 283 | static void |
2e73a022 | 284 | process_remove_identity(SocketEntry *e, int version) |
8efc0c15 | 285 | { |
2e73a022 | 286 | Key *key = NULL, *private; |
1e3b8b07 | 287 | u_char *blob; |
288 | u_int blen; | |
289 | u_int bits; | |
2e73a022 | 290 | int success = 0; |
291 | ||
292 | switch(version){ | |
293 | case 1: | |
fa08c86b | 294 | key = key_new(KEY_RSA1); |
2e73a022 | 295 | bits = buffer_get_int(&e->input); |
296 | buffer_get_bignum(&e->input, key->rsa->e); | |
297 | buffer_get_bignum(&e->input, key->rsa->n); | |
298 | ||
299 | if (bits != key_size(key)) | |
300 | log("Warning: identity keysize mismatch: actual %d, announced %d", | |
42f11eb2 | 301 | key_size(key), bits); |
2e73a022 | 302 | break; |
303 | case 2: | |
304 | blob = buffer_get_string(&e->input, &blen); | |
fa08c86b | 305 | key = key_from_blob(blob, blen); |
2e73a022 | 306 | xfree(blob); |
307 | break; | |
308 | } | |
309 | if (key != NULL) { | |
310 | int idx; | |
311 | private = lookup_private_key(key, &idx, version); | |
312 | if (private != NULL) { | |
aa3378df | 313 | /* |
314 | * We have this key. Free the old key. Since we | |
315 | * don\'t want to leave empty slots in the middle of | |
d343d900 | 316 | * the array, we actually free the key there and move |
317 | * all the entries between the empty slot and the end | |
318 | * of the array. | |
aa3378df | 319 | */ |
2e73a022 | 320 | Idtab *tab = idtab_lookup(version); |
321 | key_free(tab->identities[idx].key); | |
322 | xfree(tab->identities[idx].comment); | |
fa08c86b | 323 | if (tab->nentries < 1) |
324 | fatal("process_remove_identity: " | |
325 | "internal error: tab->nentries %d", | |
326 | tab->nentries); | |
d343d900 | 327 | if (idx != tab->nentries - 1) { |
328 | int i; | |
329 | for (i = idx; i < tab->nentries - 1; i++) | |
330 | tab->identities[i] = tab->identities[i+1]; | |
331 | } | |
332 | tab->identities[tab->nentries - 1].key = NULL; | |
333 | tab->identities[tab->nentries - 1].comment = NULL; | |
2e73a022 | 334 | tab->nentries--; |
335 | success = 1; | |
5260325f | 336 | } |
2e73a022 | 337 | key_free(key); |
338 | } | |
8efc0c15 | 339 | buffer_put_int(&e->output, 1); |
2e73a022 | 340 | buffer_put_char(&e->output, |
341 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
8efc0c15 | 342 | } |
343 | ||
396c147e | 344 | static void |
2e73a022 | 345 | process_remove_all_identities(SocketEntry *e, int version) |
8efc0c15 | 346 | { |
1e3b8b07 | 347 | u_int i; |
2e73a022 | 348 | Idtab *tab = idtab_lookup(version); |
8efc0c15 | 349 | |
5260325f | 350 | /* Loop over all identities and clear the keys. */ |
2e73a022 | 351 | for (i = 0; i < tab->nentries; i++) { |
352 | key_free(tab->identities[i].key); | |
353 | xfree(tab->identities[i].comment); | |
5260325f | 354 | } |
8efc0c15 | 355 | |
5260325f | 356 | /* Mark that there are no identities. */ |
2e73a022 | 357 | tab->nentries = 0; |
8efc0c15 | 358 | |
359 | /* Send success. */ | |
360 | buffer_put_int(&e->output, 1); | |
361 | buffer_put_char(&e->output, SSH_AGENT_SUCCESS); | |
362 | return; | |
5260325f | 363 | } |
364 | ||
396c147e | 365 | static void |
fa08c86b | 366 | process_add_identity(SocketEntry *e, int version) |
367 | { | |
368 | Key *k = NULL; | |
369 | char *type_name; | |
2e73a022 | 370 | char *comment; |
fa08c86b | 371 | int type, success = 0; |
2e73a022 | 372 | Idtab *tab = idtab_lookup(version); |
5260325f | 373 | |
2e73a022 | 374 | switch (version) { |
375 | case 1: | |
fa08c86b | 376 | k = key_new_private(KEY_RSA1); |
42f11eb2 | 377 | buffer_get_int(&e->input); /* ignored */ |
fa08c86b | 378 | buffer_get_bignum(&e->input, k->rsa->n); |
379 | buffer_get_bignum(&e->input, k->rsa->e); | |
380 | buffer_get_bignum(&e->input, k->rsa->d); | |
381 | buffer_get_bignum(&e->input, k->rsa->iqmp); | |
2e73a022 | 382 | |
383 | /* SSH and SSL have p and q swapped */ | |
fa08c86b | 384 | buffer_get_bignum(&e->input, k->rsa->q); /* p */ |
385 | buffer_get_bignum(&e->input, k->rsa->p); /* q */ | |
2e73a022 | 386 | |
387 | /* Generate additional parameters */ | |
2b63e803 | 388 | rsa_generate_additional_parameters(k->rsa); |
2e73a022 | 389 | break; |
390 | case 2: | |
fa08c86b | 391 | type_name = buffer_get_string(&e->input, NULL); |
42f11eb2 | 392 | type = key_type_from_name(type_name); |
fa08c86b | 393 | xfree(type_name); |
394 | switch(type) { | |
395 | case KEY_DSA: | |
396 | k = key_new_private(type); | |
397 | buffer_get_bignum2(&e->input, k->dsa->p); | |
398 | buffer_get_bignum2(&e->input, k->dsa->q); | |
399 | buffer_get_bignum2(&e->input, k->dsa->g); | |
400 | buffer_get_bignum2(&e->input, k->dsa->pub_key); | |
401 | buffer_get_bignum2(&e->input, k->dsa->priv_key); | |
402 | break; | |
403 | case KEY_RSA: | |
404 | k = key_new_private(type); | |
405 | buffer_get_bignum2(&e->input, k->rsa->n); | |
406 | buffer_get_bignum2(&e->input, k->rsa->e); | |
407 | buffer_get_bignum2(&e->input, k->rsa->d); | |
408 | buffer_get_bignum2(&e->input, k->rsa->iqmp); | |
409 | buffer_get_bignum2(&e->input, k->rsa->p); | |
410 | buffer_get_bignum2(&e->input, k->rsa->q); | |
411 | ||
412 | /* Generate additional parameters */ | |
2b63e803 | 413 | rsa_generate_additional_parameters(k->rsa); |
fa08c86b | 414 | break; |
415 | default: | |
2e73a022 | 416 | buffer_clear(&e->input); |
2e73a022 | 417 | goto send; |
5260325f | 418 | } |
2e73a022 | 419 | break; |
420 | } | |
2e73a022 | 421 | comment = buffer_get_string(&e->input, NULL); |
422 | if (k == NULL) { | |
423 | xfree(comment); | |
424 | goto send; | |
425 | } | |
426 | success = 1; | |
427 | if (lookup_private_key(k, NULL, version) == NULL) { | |
428 | if (tab->nentries == 0) | |
429 | tab->identities = xmalloc(sizeof(Identity)); | |
430 | else | |
431 | tab->identities = xrealloc(tab->identities, | |
432 | (tab->nentries + 1) * sizeof(Identity)); | |
433 | tab->identities[tab->nentries].key = k; | |
434 | tab->identities[tab->nentries].comment = comment; | |
435 | /* Increment the number of identities. */ | |
436 | tab->nentries++; | |
437 | } else { | |
438 | key_free(k); | |
439 | xfree(comment); | |
440 | } | |
441 | send: | |
5260325f | 442 | buffer_put_int(&e->output, 1); |
2e73a022 | 443 | buffer_put_char(&e->output, |
444 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
8efc0c15 | 445 | } |
446 | ||
2b5fe3b8 | 447 | |
448 | #ifdef SMARTCARD | |
449 | static void | |
450 | process_add_smartcard_key (SocketEntry *e) | |
451 | { | |
452 | Idtab *tab; | |
453 | Key *n = NULL, *k = NULL; | |
454 | int success = 0; | |
455 | int sc_reader_num = 0; | |
456 | ||
457 | sc_reader_num = buffer_get_int(&e->input); | |
458 | ||
459 | k = sc_get_key(sc_reader_num); | |
460 | if (k == NULL) { | |
461 | error("sc_get_pubkey failed"); | |
462 | goto send; | |
463 | } | |
464 | success = 1; | |
465 | ||
466 | tab = idtab_lookup(1); | |
467 | if (lookup_private_key(k, NULL, 1) == NULL) { | |
468 | if (tab->nentries == 0) | |
469 | tab->identities = xmalloc(sizeof(Identity)); | |
470 | else | |
471 | tab->identities = xrealloc(tab->identities, | |
472 | (tab->nentries + 1) * sizeof(Identity)); | |
473 | n = key_new(KEY_RSA1); | |
474 | BN_copy(n->rsa->n, k->rsa->n); | |
475 | BN_copy(n->rsa->e, k->rsa->e); | |
476 | RSA_set_method(n->rsa, sc_get_engine()); | |
477 | tab->identities[tab->nentries].key = n; | |
478 | tab->identities[tab->nentries].comment = | |
479 | xstrdup("rsa1 smartcard"); | |
480 | tab->nentries++; | |
481 | } | |
482 | tab = idtab_lookup(2); | |
483 | if (lookup_private_key(k, NULL, 2) == NULL) { | |
484 | if (tab->nentries == 0) | |
485 | tab->identities = xmalloc(sizeof(Identity)); | |
486 | else | |
487 | tab->identities = xrealloc(tab->identities, | |
488 | (tab->nentries + 1) * sizeof(Identity)); | |
489 | n = key_new(KEY_RSA); | |
490 | BN_copy(n->rsa->n, k->rsa->n); | |
491 | BN_copy(n->rsa->e, k->rsa->e); | |
492 | RSA_set_method(n->rsa, sc_get_engine()); | |
493 | tab->identities[tab->nentries].key = n; | |
494 | tab->identities[tab->nentries].comment = | |
495 | xstrdup("rsa smartcard"); | |
496 | tab->nentries++; | |
497 | } | |
498 | key_free(k); | |
499 | send: | |
500 | buffer_put_int(&e->output, 1); | |
501 | buffer_put_char(&e->output, | |
502 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
503 | } | |
504 | ||
505 | static void | |
506 | process_remove_smartcard_key(SocketEntry *e) | |
507 | { | |
508 | Key *k = NULL, *private; | |
509 | int idx; | |
510 | int success = 0; | |
511 | int sc_reader_num = 0; | |
512 | ||
513 | sc_reader_num = buffer_get_int(&e->input); | |
514 | ||
515 | if ((k = sc_get_key(sc_reader_num)) == NULL) { | |
516 | error("sc_get_pubkey failed"); | |
517 | } else { | |
77261db4 | 518 | k->type = KEY_RSA1; |
2b5fe3b8 | 519 | private = lookup_private_key(k, &idx, 1); |
520 | if (private != NULL) { | |
521 | Idtab *tab = idtab_lookup(1); | |
522 | key_free(tab->identities[idx].key); | |
523 | xfree(tab->identities[idx].comment); | |
524 | if (idx != tab->nentries) | |
525 | tab->identities[idx] = tab->identities[tab->nentries]; | |
526 | tab->nentries--; | |
527 | success = 1; | |
528 | } | |
77261db4 | 529 | k->type = KEY_RSA; |
2b5fe3b8 | 530 | private = lookup_private_key(k, &idx, 2); |
531 | if (private != NULL) { | |
532 | Idtab *tab = idtab_lookup(2); | |
533 | key_free(tab->identities[idx].key); | |
534 | xfree(tab->identities[idx].comment); | |
535 | if (idx != tab->nentries) | |
536 | tab->identities[idx] = tab->identities[tab->nentries]; | |
537 | tab->nentries--; | |
538 | success = 1; | |
539 | } | |
540 | key_free(k); | |
541 | } | |
542 | ||
543 | buffer_put_int(&e->output, 1); | |
544 | buffer_put_char(&e->output, | |
545 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); | |
546 | } | |
547 | #endif | |
548 | ||
2e73a022 | 549 | /* dispatch incoming messages */ |
550 | ||
396c147e | 551 | static void |
8efc0c15 | 552 | process_message(SocketEntry *e) |
553 | { | |
1e3b8b07 | 554 | u_int msg_len; |
555 | u_int type; | |
556 | u_char *cp; | |
5260325f | 557 | if (buffer_len(&e->input) < 5) |
558 | return; /* Incomplete message. */ | |
1e3b8b07 | 559 | cp = (u_char *) buffer_ptr(&e->input); |
5260325f | 560 | msg_len = GET_32BIT(cp); |
561 | if (msg_len > 256 * 1024) { | |
562 | shutdown(e->fd, SHUT_RDWR); | |
563 | close(e->fd); | |
564 | e->type = AUTH_UNUSED; | |
565 | return; | |
566 | } | |
567 | if (buffer_len(&e->input) < msg_len + 4) | |
568 | return; | |
569 | buffer_consume(&e->input, 4); | |
570 | type = buffer_get_char(&e->input); | |
571 | ||
2b5fe3b8 | 572 | debug("type %d", type); |
5260325f | 573 | switch (type) { |
2e73a022 | 574 | /* ssh1 */ |
5260325f | 575 | case SSH_AGENTC_RSA_CHALLENGE: |
2e73a022 | 576 | process_authentication_challenge1(e); |
577 | break; | |
578 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: | |
579 | process_request_identities(e, 1); | |
5260325f | 580 | break; |
581 | case SSH_AGENTC_ADD_RSA_IDENTITY: | |
2e73a022 | 582 | process_add_identity(e, 1); |
5260325f | 583 | break; |
584 | case SSH_AGENTC_REMOVE_RSA_IDENTITY: | |
2e73a022 | 585 | process_remove_identity(e, 1); |
5260325f | 586 | break; |
587 | case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: | |
2e73a022 | 588 | process_remove_all_identities(e, 1); |
589 | break; | |
590 | /* ssh2 */ | |
591 | case SSH2_AGENTC_SIGN_REQUEST: | |
592 | process_sign_request2(e); | |
593 | break; | |
594 | case SSH2_AGENTC_REQUEST_IDENTITIES: | |
595 | process_request_identities(e, 2); | |
596 | break; | |
597 | case SSH2_AGENTC_ADD_IDENTITY: | |
598 | process_add_identity(e, 2); | |
599 | break; | |
600 | case SSH2_AGENTC_REMOVE_IDENTITY: | |
601 | process_remove_identity(e, 2); | |
602 | break; | |
603 | case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: | |
604 | process_remove_all_identities(e, 2); | |
5260325f | 605 | break; |
2b5fe3b8 | 606 | #ifdef SMARTCARD |
607 | case SSH_AGENTC_ADD_SMARTCARD_KEY: | |
608 | process_add_smartcard_key(e); | |
609 | break; | |
610 | case SSH_AGENTC_REMOVE_SMARTCARD_KEY: | |
611 | process_remove_smartcard_key(e); | |
612 | break; | |
613 | #endif | |
5260325f | 614 | default: |
615 | /* Unknown message. Respond with failure. */ | |
616 | error("Unknown message %d", type); | |
617 | buffer_clear(&e->input); | |
618 | buffer_put_int(&e->output, 1); | |
619 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); | |
620 | break; | |
621 | } | |
8efc0c15 | 622 | } |
623 | ||
396c147e | 624 | static void |
8efc0c15 | 625 | new_socket(int type, int fd) |
626 | { | |
1e3b8b07 | 627 | u_int i, old_alloc; |
5260325f | 628 | if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) |
629 | error("fcntl O_NONBLOCK: %s", strerror(errno)); | |
630 | ||
631 | if (fd > max_fd) | |
632 | max_fd = fd; | |
633 | ||
634 | for (i = 0; i < sockets_alloc; i++) | |
635 | if (sockets[i].type == AUTH_UNUSED) { | |
636 | sockets[i].fd = fd; | |
637 | sockets[i].type = type; | |
638 | buffer_init(&sockets[i].input); | |
639 | buffer_init(&sockets[i].output); | |
640 | return; | |
641 | } | |
642 | old_alloc = sockets_alloc; | |
643 | sockets_alloc += 10; | |
644 | if (sockets) | |
645 | sockets = xrealloc(sockets, sockets_alloc * sizeof(sockets[0])); | |
646 | else | |
647 | sockets = xmalloc(sockets_alloc * sizeof(sockets[0])); | |
648 | for (i = old_alloc; i < sockets_alloc; i++) | |
649 | sockets[i].type = AUTH_UNUSED; | |
650 | sockets[old_alloc].type = type; | |
651 | sockets[old_alloc].fd = fd; | |
652 | buffer_init(&sockets[old_alloc].input); | |
653 | buffer_init(&sockets[old_alloc].output); | |
8efc0c15 | 654 | } |
655 | ||
396c147e | 656 | static int |
42f11eb2 | 657 | prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl) |
8efc0c15 | 658 | { |
42f11eb2 | 659 | u_int i, sz; |
660 | int n = 0; | |
661 | ||
662 | for (i = 0; i < sockets_alloc; i++) { | |
5260325f | 663 | switch (sockets[i].type) { |
664 | case AUTH_SOCKET: | |
665 | case AUTH_CONNECTION: | |
42f11eb2 | 666 | n = MAX(n, sockets[i].fd); |
5260325f | 667 | break; |
668 | case AUTH_UNUSED: | |
669 | break; | |
670 | default: | |
671 | fatal("Unknown socket type %d", sockets[i].type); | |
672 | break; | |
673 | } | |
42f11eb2 | 674 | } |
675 | ||
676 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); | |
677 | if (*fdrp == NULL || n > *fdl) { | |
678 | if (*fdrp) | |
894c5fa6 | 679 | xfree(*fdrp); |
42f11eb2 | 680 | if (*fdwp) |
894c5fa6 | 681 | xfree(*fdwp); |
42f11eb2 | 682 | *fdrp = xmalloc(sz); |
683 | *fdwp = xmalloc(sz); | |
684 | *fdl = n; | |
685 | } | |
686 | memset(*fdrp, 0, sz); | |
687 | memset(*fdwp, 0, sz); | |
688 | ||
689 | for (i = 0; i < sockets_alloc; i++) { | |
690 | switch (sockets[i].type) { | |
691 | case AUTH_SOCKET: | |
692 | case AUTH_CONNECTION: | |
693 | FD_SET(sockets[i].fd, *fdrp); | |
694 | if (buffer_len(&sockets[i].output) > 0) | |
695 | FD_SET(sockets[i].fd, *fdwp); | |
696 | break; | |
697 | default: | |
698 | break; | |
699 | } | |
700 | } | |
701 | return (1); | |
8efc0c15 | 702 | } |
703 | ||
396c147e | 704 | static void |
5260325f | 705 | after_select(fd_set *readset, fd_set *writeset) |
8efc0c15 | 706 | { |
1e3b8b07 | 707 | u_int i; |
5260325f | 708 | int len, sock; |
610cd5c6 | 709 | socklen_t slen; |
5260325f | 710 | char buf[1024]; |
711 | struct sockaddr_un sunaddr; | |
712 | ||
713 | for (i = 0; i < sockets_alloc; i++) | |
714 | switch (sockets[i].type) { | |
715 | case AUTH_UNUSED: | |
716 | break; | |
717 | case AUTH_SOCKET: | |
718 | if (FD_ISSET(sockets[i].fd, readset)) { | |
610cd5c6 | 719 | slen = sizeof(sunaddr); |
42f11eb2 | 720 | sock = accept(sockets[i].fd, |
721 | (struct sockaddr *) &sunaddr, &slen); | |
5260325f | 722 | if (sock < 0) { |
723 | perror("accept from AUTH_SOCKET"); | |
724 | break; | |
725 | } | |
726 | new_socket(AUTH_CONNECTION, sock); | |
727 | } | |
728 | break; | |
729 | case AUTH_CONNECTION: | |
730 | if (buffer_len(&sockets[i].output) > 0 && | |
731 | FD_ISSET(sockets[i].fd, writeset)) { | |
bbc62e59 | 732 | do { |
733 | len = write(sockets[i].fd, | |
734 | buffer_ptr(&sockets[i].output), | |
735 | buffer_len(&sockets[i].output)); | |
736 | if (len == -1 && (errno == EAGAIN || | |
737 | errno == EINTR)) | |
738 | continue; | |
739 | break; | |
740 | } while (1); | |
5260325f | 741 | if (len <= 0) { |
742 | shutdown(sockets[i].fd, SHUT_RDWR); | |
743 | close(sockets[i].fd); | |
744 | sockets[i].type = AUTH_UNUSED; | |
0ac7199f | 745 | buffer_free(&sockets[i].input); |
746 | buffer_free(&sockets[i].output); | |
5260325f | 747 | break; |
748 | } | |
749 | buffer_consume(&sockets[i].output, len); | |
750 | } | |
751 | if (FD_ISSET(sockets[i].fd, readset)) { | |
bbc62e59 | 752 | do { |
753 | len = read(sockets[i].fd, buf, sizeof(buf)); | |
754 | if (len == -1 && (errno == EAGAIN || | |
755 | errno == EINTR)) | |
756 | continue; | |
757 | break; | |
758 | } while (1); | |
5260325f | 759 | if (len <= 0) { |
760 | shutdown(sockets[i].fd, SHUT_RDWR); | |
761 | close(sockets[i].fd); | |
762 | sockets[i].type = AUTH_UNUSED; | |
0ac7199f | 763 | buffer_free(&sockets[i].input); |
764 | buffer_free(&sockets[i].output); | |
5260325f | 765 | break; |
766 | } | |
767 | buffer_append(&sockets[i].input, buf, len); | |
768 | process_message(&sockets[i]); | |
769 | } | |
770 | break; | |
771 | default: | |
772 | fatal("Unknown type %d", sockets[i].type); | |
773 | } | |
8efc0c15 | 774 | } |
775 | ||
396c147e | 776 | static void |
8efc0c15 | 777 | check_parent_exists(int sig) |
778 | { | |
42f11eb2 | 779 | int save_errno = errno; |
780 | ||
9da5c3c9 | 781 | if (parent_pid != -1 && kill(parent_pid, 0) < 0) { |
5260325f | 782 | /* printf("Parent has died - Authentication agent exiting.\n"); */ |
783 | exit(1); | |
784 | } | |
785 | signal(SIGALRM, check_parent_exists); | |
786 | alarm(10); | |
42f11eb2 | 787 | errno = save_errno; |
8efc0c15 | 788 | } |
789 | ||
396c147e | 790 | static void |
dae3fa13 | 791 | cleanup_socket(void) |
792 | { | |
2f4b2e38 | 793 | if (socket_name[0]) |
794 | unlink(socket_name); | |
795 | if (socket_dir[0]) | |
796 | rmdir(socket_dir); | |
8efc0c15 | 797 | } |
798 | ||
396c147e | 799 | static void |
dae3fa13 | 800 | cleanup_exit(int i) |
801 | { | |
5260325f | 802 | cleanup_socket(); |
803 | exit(i); | |
dae3fa13 | 804 | } |
805 | ||
396c147e | 806 | static void |
2f4b2e38 | 807 | cleanup_handler(int sig) |
808 | { | |
809 | cleanup_socket(); | |
810 | _exit(2); | |
811 | } | |
812 | ||
396c147e | 813 | static void |
cc8aca8a | 814 | usage(void) |
dae3fa13 | 815 | { |
5260325f | 816 | fprintf(stderr, "ssh-agent version %s\n", SSH_VERSION); |
f7e5ac7b | 817 | fprintf(stderr, "Usage: %s [-c | -s] [-k] [-d] [command {args...]]\n", |
0e3c1f95 | 818 | __progname); |
5260325f | 819 | exit(1); |
dae3fa13 | 820 | } |
821 | ||
8efc0c15 | 822 | int |
823 | main(int ac, char **av) | |
824 | { | |
ffdb5d70 | 825 | int sock, c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0, ch; |
5260325f | 826 | struct sockaddr_un sunaddr; |
b03bd394 | 827 | #ifdef HAVE_SETRLIMIT |
0b6fbf03 | 828 | struct rlimit rlim; |
c7ccfd39 | 829 | #endif |
830 | #ifdef HAVE_CYGWIN | |
831 | int prev_mask; | |
b03bd394 | 832 | #endif |
5260325f | 833 | pid_t pid; |
834 | char *shell, *format, *pidstr, pidstrbuf[1 + 3 * sizeof pid]; | |
c04f75f1 | 835 | extern int optind; |
42f11eb2 | 836 | fd_set *readsetp = NULL, *writesetp = NULL; |
fcb975eb | 837 | |
457fc0c6 | 838 | SSLeay_add_all_algorithms(); |
839 | ||
260d427b | 840 | __progname = get_progname(av[0]); |
264dce47 | 841 | init_rng(); |
e339aa53 | 842 | seed_rng(); |
2b87da3b | 843 | |
4e577b89 | 844 | #ifdef __GNU_LIBRARY__ |
ffdb5d70 | 845 | while ((ch = getopt(ac, av, "+cdks")) != -1) { |
4e577b89 | 846 | #else /* __GNU_LIBRARY__ */ |
ffdb5d70 | 847 | while ((ch = getopt(ac, av, "cdks")) != -1) { |
4e577b89 | 848 | #endif /* __GNU_LIBRARY__ */ |
5260325f | 849 | switch (ch) { |
850 | case 'c': | |
851 | if (s_flag) | |
852 | usage(); | |
853 | c_flag++; | |
854 | break; | |
855 | case 'k': | |
856 | k_flag++; | |
857 | break; | |
858 | case 's': | |
859 | if (c_flag) | |
860 | usage(); | |
861 | s_flag++; | |
862 | break; | |
ffdb5d70 | 863 | case 'd': |
864 | if (d_flag) | |
865 | usage(); | |
866 | d_flag++; | |
867 | break; | |
5260325f | 868 | default: |
869 | usage(); | |
870 | } | |
dae3fa13 | 871 | } |
5260325f | 872 | ac -= optind; |
873 | av += optind; | |
874 | ||
ffdb5d70 | 875 | if (ac > 0 && (c_flag || k_flag || s_flag || d_flag)) |
5260325f | 876 | usage(); |
877 | ||
ffdb5d70 | 878 | if (ac == 0 && !c_flag && !k_flag && !s_flag && !d_flag) { |
5260325f | 879 | shell = getenv("SHELL"); |
880 | if (shell != NULL && strncmp(shell + strlen(shell) - 3, "csh", 3) == 0) | |
881 | c_flag = 1; | |
dae3fa13 | 882 | } |
5260325f | 883 | if (k_flag) { |
884 | pidstr = getenv(SSH_AGENTPID_ENV_NAME); | |
885 | if (pidstr == NULL) { | |
886 | fprintf(stderr, "%s not set, cannot kill agent\n", | |
42f11eb2 | 887 | SSH_AGENTPID_ENV_NAME); |
5260325f | 888 | exit(1); |
889 | } | |
890 | pid = atoi(pidstr); | |
42f11eb2 | 891 | if (pid < 1) { |
5260325f | 892 | fprintf(stderr, "%s=\"%s\", which is not a good PID\n", |
42f11eb2 | 893 | SSH_AGENTPID_ENV_NAME, pidstr); |
5260325f | 894 | exit(1); |
895 | } | |
896 | if (kill(pid, SIGTERM) == -1) { | |
897 | perror("kill"); | |
898 | exit(1); | |
899 | } | |
900 | format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; | |
901 | printf(format, SSH_AUTHSOCKET_ENV_NAME); | |
902 | printf(format, SSH_AGENTPID_ENV_NAME); | |
903 | printf("echo Agent pid %d killed;\n", pid); | |
904 | exit(0); | |
dae3fa13 | 905 | } |
5260325f | 906 | parent_pid = getpid(); |
907 | ||
908 | /* Create private directory for agent socket */ | |
909 | strlcpy(socket_dir, "/tmp/ssh-XXXXXXXX", sizeof socket_dir); | |
910 | if (mkdtemp(socket_dir) == NULL) { | |
911 | perror("mkdtemp: private socket dir"); | |
912 | exit(1); | |
913 | } | |
914 | snprintf(socket_name, sizeof socket_name, "%s/agent.%d", socket_dir, | |
42f11eb2 | 915 | parent_pid); |
5260325f | 916 | |
aa3378df | 917 | /* |
918 | * Create socket early so it will exist before command gets run from | |
919 | * the parent. | |
920 | */ | |
5260325f | 921 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
922 | if (sock < 0) { | |
923 | perror("socket"); | |
924 | cleanup_exit(1); | |
925 | } | |
926 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
927 | sunaddr.sun_family = AF_UNIX; | |
928 | strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path)); | |
c7ccfd39 | 929 | #ifdef HAVE_CYGWIN |
930 | prev_mask = umask(0177); | |
931 | #endif | |
5260325f | 932 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) { |
933 | perror("bind"); | |
c7ccfd39 | 934 | #ifdef HAVE_CYGWIN |
935 | umask(prev_mask); | |
936 | #endif | |
5260325f | 937 | cleanup_exit(1); |
938 | } | |
c7ccfd39 | 939 | #ifdef HAVE_CYGWIN |
940 | umask(prev_mask); | |
941 | #endif | |
5260325f | 942 | if (listen(sock, 5) < 0) { |
943 | perror("listen"); | |
944 | cleanup_exit(1); | |
dae3fa13 | 945 | } |
42f11eb2 | 946 | |
aa3378df | 947 | /* |
948 | * Fork, and have the parent execute the command, if any, or present | |
949 | * the socket data. The child continues as the authentication agent. | |
950 | */ | |
ffdb5d70 | 951 | if (d_flag) { |
952 | log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1); | |
953 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
954 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
955 | SSH_AUTHSOCKET_ENV_NAME); | |
956 | printf("echo Agent pid %d;\n", parent_pid); | |
957 | goto skip; | |
958 | } | |
5260325f | 959 | pid = fork(); |
960 | if (pid == -1) { | |
961 | perror("fork"); | |
962 | exit(1); | |
dae3fa13 | 963 | } |
5260325f | 964 | if (pid != 0) { /* Parent - execute the given command. */ |
965 | close(sock); | |
966 | snprintf(pidstrbuf, sizeof pidstrbuf, "%d", pid); | |
967 | if (ac == 0) { | |
968 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; | |
969 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, | |
42f11eb2 | 970 | SSH_AUTHSOCKET_ENV_NAME); |
5260325f | 971 | printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, |
42f11eb2 | 972 | SSH_AGENTPID_ENV_NAME); |
5260325f | 973 | printf("echo Agent pid %d;\n", pid); |
974 | exit(0); | |
975 | } | |
bcbf86ec | 976 | if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 || |
977 | setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) { | |
978 | perror("setenv"); | |
979 | exit(1); | |
980 | } | |
5260325f | 981 | execvp(av[0], av); |
982 | perror(av[0]); | |
983 | exit(1); | |
984 | } | |
985 | close(0); | |
986 | close(1); | |
987 | close(2); | |
dae3fa13 | 988 | |
b03bd394 | 989 | #ifdef HAVE_SETRLIMIT |
0b6fbf03 | 990 | /* deny core dumps, since memory contains unencrypted private keys */ |
991 | rlim.rlim_cur = rlim.rlim_max = 0; | |
992 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) { | |
993 | perror("setrlimit rlimit_core failed"); | |
994 | cleanup_exit(1); | |
995 | } | |
b03bd394 | 996 | #endif |
5260325f | 997 | if (setsid() == -1) { |
998 | perror("setsid"); | |
999 | cleanup_exit(1); | |
1000 | } | |
ffdb5d70 | 1001 | |
1002 | skip: | |
5260325f | 1003 | if (atexit(cleanup_socket) < 0) { |
1004 | perror("atexit"); | |
1005 | cleanup_exit(1); | |
1006 | } | |
1007 | new_socket(AUTH_SOCKET, sock); | |
1008 | if (ac > 0) { | |
1009 | signal(SIGALRM, check_parent_exists); | |
1010 | alarm(10); | |
1011 | } | |
2e73a022 | 1012 | idtab_init(); |
1ee482c5 | 1013 | if (!d_flag) |
ffdb5d70 | 1014 | signal(SIGINT, SIG_IGN); |
1ee482c5 | 1015 | signal(SIGPIPE, SIG_IGN); |
2f4b2e38 | 1016 | signal(SIGHUP, cleanup_handler); |
1017 | signal(SIGTERM, cleanup_handler); | |
5260325f | 1018 | while (1) { |
42f11eb2 | 1019 | prepare_select(&readsetp, &writesetp, &max_fd); |
1020 | if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) { | |
5260325f | 1021 | if (errno == EINTR) |
1022 | continue; | |
1023 | exit(1); | |
1024 | } | |
42f11eb2 | 1025 | after_select(readsetp, writesetp); |
8efc0c15 | 1026 | } |
5260325f | 1027 | /* NOTREACHED */ |
8efc0c15 | 1028 | } |