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1 | /* | |
2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * Functions for connecting the local authentication agent. | |
6 | * | |
7 | * As far as I am concerned, the code I have written for this software | |
8 | * can be used freely for any purpose. Any derived versions of this | |
9 | * software must be clearly marked as such, and if the derived work is | |
10 | * incompatible with the protocol description in the RFC file, it must be | |
11 | * called by a name other than "ssh" or "Secure Shell". | |
12 | * | |
13 | * SSH2 implementation, | |
14 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
15 | * | |
16 | * Redistribution and use in source and binary forms, with or without | |
17 | * modification, are permitted provided that the following conditions | |
18 | * are met: | |
19 | * 1. Redistributions of source code must retain the above copyright | |
20 | * notice, this list of conditions and the following disclaimer. | |
21 | * 2. Redistributions in binary form must reproduce the above copyright | |
22 | * notice, this list of conditions and the following disclaimer in the | |
23 | * documentation and/or other materials provided with the distribution. | |
24 | * | |
25 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
26 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
27 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
28 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
29 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
30 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
31 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
32 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
33 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
34 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
35 | */ | |
36 | ||
37 | #include "includes.h" | |
38 | RCSID("$OpenBSD: authfd.c,v 1.65 2005/05/24 17:32:43 avsm Exp $"); | |
39 | ||
40 | #include <openssl/evp.h> | |
41 | ||
42 | #include "ssh.h" | |
43 | #include "rsa.h" | |
44 | #include "buffer.h" | |
45 | #include "bufaux.h" | |
46 | #include "xmalloc.h" | |
47 | #include "getput.h" | |
48 | #include "key.h" | |
49 | #include "authfd.h" | |
50 | #include "cipher.h" | |
51 | #include "kex.h" | |
52 | #include "compat.h" | |
53 | #include "log.h" | |
54 | #include "atomicio.h" | |
55 | ||
56 | static int agent_present = 0; | |
57 | ||
58 | /* helper */ | |
59 | int decode_reply(int type); | |
60 | ||
61 | /* macro to check for "agent failure" message */ | |
62 | #define agent_failed(x) \ | |
63 | ((x == SSH_AGENT_FAILURE) || (x == SSH_COM_AGENT2_FAILURE) || \ | |
64 | (x == SSH2_AGENT_FAILURE)) | |
65 | ||
66 | int | |
67 | ssh_agent_present(void) | |
68 | { | |
69 | int authfd; | |
70 | ||
71 | if (agent_present) | |
72 | return 1; | |
73 | if ((authfd = ssh_get_authentication_socket()) == -1) | |
74 | return 0; | |
75 | else { | |
76 | ssh_close_authentication_socket(authfd); | |
77 | return 1; | |
78 | } | |
79 | } | |
80 | ||
81 | /* Returns the number of the authentication fd, or -1 if there is none. */ | |
82 | ||
83 | int | |
84 | ssh_get_authentication_socket(void) | |
85 | { | |
86 | const char *authsocket; | |
87 | int sock; | |
88 | struct sockaddr_un sunaddr; | |
89 | ||
90 | authsocket = getenv(SSH_AUTHSOCKET_ENV_NAME); | |
91 | if (!authsocket) | |
92 | return -1; | |
93 | ||
94 | sunaddr.sun_family = AF_UNIX; | |
95 | strlcpy(sunaddr.sun_path, authsocket, sizeof(sunaddr.sun_path)); | |
96 | ||
97 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
98 | if (sock < 0) | |
99 | return -1; | |
100 | ||
101 | /* close on exec */ | |
102 | if (fcntl(sock, F_SETFD, 1) == -1) { | |
103 | close(sock); | |
104 | return -1; | |
105 | } | |
106 | if (connect(sock, (struct sockaddr *) &sunaddr, sizeof sunaddr) < 0) { | |
107 | close(sock); | |
108 | return -1; | |
109 | } | |
110 | agent_present = 1; | |
111 | return sock; | |
112 | } | |
113 | ||
114 | static int | |
115 | ssh_request_reply(AuthenticationConnection *auth, Buffer *request, Buffer *reply) | |
116 | { | |
117 | int l; | |
118 | u_int len; | |
119 | char buf[1024]; | |
120 | ||
121 | /* Get the length of the message, and format it in the buffer. */ | |
122 | len = buffer_len(request); | |
123 | PUT_32BIT(buf, len); | |
124 | ||
125 | /* Send the length and then the packet to the agent. */ | |
126 | if (atomicio(vwrite, auth->fd, buf, 4) != 4 || | |
127 | atomicio(vwrite, auth->fd, buffer_ptr(request), | |
128 | buffer_len(request)) != buffer_len(request)) { | |
129 | error("Error writing to authentication socket."); | |
130 | return 0; | |
131 | } | |
132 | /* | |
133 | * Wait for response from the agent. First read the length of the | |
134 | * response packet. | |
135 | */ | |
136 | if (atomicio(read, auth->fd, buf, 4) != 4) { | |
137 | error("Error reading response length from authentication socket."); | |
138 | return 0; | |
139 | } | |
140 | ||
141 | /* Extract the length, and check it for sanity. */ | |
142 | len = GET_32BIT(buf); | |
143 | if (len > 256 * 1024) | |
144 | fatal("Authentication response too long: %u", len); | |
145 | ||
146 | /* Read the rest of the response in to the buffer. */ | |
147 | buffer_clear(reply); | |
148 | while (len > 0) { | |
149 | l = len; | |
150 | if (l > sizeof(buf)) | |
151 | l = sizeof(buf); | |
152 | if (atomicio(read, auth->fd, buf, l) != l) { | |
153 | error("Error reading response from authentication socket."); | |
154 | return 0; | |
155 | } | |
156 | buffer_append(reply, buf, l); | |
157 | len -= l; | |
158 | } | |
159 | return 1; | |
160 | } | |
161 | ||
162 | /* | |
163 | * Closes the agent socket if it should be closed (depends on how it was | |
164 | * obtained). The argument must have been returned by | |
165 | * ssh_get_authentication_socket(). | |
166 | */ | |
167 | ||
168 | void | |
169 | ssh_close_authentication_socket(int sock) | |
170 | { | |
171 | if (getenv(SSH_AUTHSOCKET_ENV_NAME)) | |
172 | close(sock); | |
173 | } | |
174 | ||
175 | /* | |
176 | * Opens and connects a private socket for communication with the | |
177 | * authentication agent. Returns the file descriptor (which must be | |
178 | * shut down and closed by the caller when no longer needed). | |
179 | * Returns NULL if an error occurred and the connection could not be | |
180 | * opened. | |
181 | */ | |
182 | ||
183 | AuthenticationConnection * | |
184 | ssh_get_authentication_connection(void) | |
185 | { | |
186 | AuthenticationConnection *auth; | |
187 | int sock; | |
188 | ||
189 | sock = ssh_get_authentication_socket(); | |
190 | ||
191 | /* | |
192 | * Fail if we couldn't obtain a connection. This happens if we | |
193 | * exited due to a timeout. | |
194 | */ | |
195 | if (sock < 0) | |
196 | return NULL; | |
197 | ||
198 | auth = xmalloc(sizeof(*auth)); | |
199 | auth->fd = sock; | |
200 | buffer_init(&auth->identities); | |
201 | auth->howmany = 0; | |
202 | ||
203 | return auth; | |
204 | } | |
205 | ||
206 | /* | |
207 | * Closes the connection to the authentication agent and frees any associated | |
208 | * memory. | |
209 | */ | |
210 | ||
211 | void | |
212 | ssh_close_authentication_connection(AuthenticationConnection *auth) | |
213 | { | |
214 | buffer_free(&auth->identities); | |
215 | close(auth->fd); | |
216 | xfree(auth); | |
217 | } | |
218 | ||
219 | /* Lock/unlock agent */ | |
220 | int | |
221 | ssh_lock_agent(AuthenticationConnection *auth, int lock, const char *password) | |
222 | { | |
223 | int type; | |
224 | Buffer msg; | |
225 | ||
226 | buffer_init(&msg); | |
227 | buffer_put_char(&msg, lock ? SSH_AGENTC_LOCK : SSH_AGENTC_UNLOCK); | |
228 | buffer_put_cstring(&msg, password); | |
229 | ||
230 | if (ssh_request_reply(auth, &msg, &msg) == 0) { | |
231 | buffer_free(&msg); | |
232 | return 0; | |
233 | } | |
234 | type = buffer_get_char(&msg); | |
235 | buffer_free(&msg); | |
236 | return decode_reply(type); | |
237 | } | |
238 | ||
239 | /* | |
240 | * Returns the first authentication identity held by the agent. | |
241 | */ | |
242 | ||
243 | int | |
244 | ssh_get_num_identities(AuthenticationConnection *auth, int version) | |
245 | { | |
246 | int type, code1 = 0, code2 = 0; | |
247 | Buffer request; | |
248 | ||
249 | switch (version) { | |
250 | case 1: | |
251 | code1 = SSH_AGENTC_REQUEST_RSA_IDENTITIES; | |
252 | code2 = SSH_AGENT_RSA_IDENTITIES_ANSWER; | |
253 | break; | |
254 | case 2: | |
255 | code1 = SSH2_AGENTC_REQUEST_IDENTITIES; | |
256 | code2 = SSH2_AGENT_IDENTITIES_ANSWER; | |
257 | break; | |
258 | default: | |
259 | return 0; | |
260 | } | |
261 | ||
262 | /* | |
263 | * Send a message to the agent requesting for a list of the | |
264 | * identities it can represent. | |
265 | */ | |
266 | buffer_init(&request); | |
267 | buffer_put_char(&request, code1); | |
268 | ||
269 | buffer_clear(&auth->identities); | |
270 | if (ssh_request_reply(auth, &request, &auth->identities) == 0) { | |
271 | buffer_free(&request); | |
272 | return 0; | |
273 | } | |
274 | buffer_free(&request); | |
275 | ||
276 | /* Get message type, and verify that we got a proper answer. */ | |
277 | type = buffer_get_char(&auth->identities); | |
278 | if (agent_failed(type)) { | |
279 | return 0; | |
280 | } else if (type != code2) { | |
281 | fatal("Bad authentication reply message type: %d", type); | |
282 | } | |
283 | ||
284 | /* Get the number of entries in the response and check it for sanity. */ | |
285 | auth->howmany = buffer_get_int(&auth->identities); | |
286 | if ((u_int)auth->howmany > 1024) | |
287 | fatal("Too many identities in authentication reply: %d", | |
288 | auth->howmany); | |
289 | ||
290 | return auth->howmany; | |
291 | } | |
292 | ||
293 | Key * | |
294 | ssh_get_first_identity(AuthenticationConnection *auth, char **comment, int version) | |
295 | { | |
296 | /* get number of identities and return the first entry (if any). */ | |
297 | if (ssh_get_num_identities(auth, version) > 0) | |
298 | return ssh_get_next_identity(auth, comment, version); | |
299 | return NULL; | |
300 | } | |
301 | ||
302 | Key * | |
303 | ssh_get_next_identity(AuthenticationConnection *auth, char **comment, int version) | |
304 | { | |
305 | u_int bits; | |
306 | u_char *blob; | |
307 | u_int blen; | |
308 | Key *key = NULL; | |
309 | ||
310 | /* Return failure if no more entries. */ | |
311 | if (auth->howmany <= 0) | |
312 | return NULL; | |
313 | ||
314 | /* | |
315 | * Get the next entry from the packet. These will abort with a fatal | |
316 | * error if the packet is too short or contains corrupt data. | |
317 | */ | |
318 | switch (version) { | |
319 | case 1: | |
320 | key = key_new(KEY_RSA1); | |
321 | bits = buffer_get_int(&auth->identities); | |
322 | buffer_get_bignum(&auth->identities, key->rsa->e); | |
323 | buffer_get_bignum(&auth->identities, key->rsa->n); | |
324 | *comment = buffer_get_string(&auth->identities, NULL); | |
325 | if (bits != BN_num_bits(key->rsa->n)) | |
326 | logit("Warning: identity keysize mismatch: actual %d, announced %u", | |
327 | BN_num_bits(key->rsa->n), bits); | |
328 | break; | |
329 | case 2: | |
330 | blob = buffer_get_string(&auth->identities, &blen); | |
331 | *comment = buffer_get_string(&auth->identities, NULL); | |
332 | key = key_from_blob(blob, blen); | |
333 | xfree(blob); | |
334 | break; | |
335 | default: | |
336 | return NULL; | |
337 | break; | |
338 | } | |
339 | /* Decrement the number of remaining entries. */ | |
340 | auth->howmany--; | |
341 | return key; | |
342 | } | |
343 | ||
344 | /* | |
345 | * Generates a random challenge, sends it to the agent, and waits for | |
346 | * response from the agent. Returns true (non-zero) if the agent gave the | |
347 | * correct answer, zero otherwise. Response type selects the style of | |
348 | * response desired, with 0 corresponding to protocol version 1.0 (no longer | |
349 | * supported) and 1 corresponding to protocol version 1.1. | |
350 | */ | |
351 | ||
352 | int | |
353 | ssh_decrypt_challenge(AuthenticationConnection *auth, | |
354 | Key* key, BIGNUM *challenge, | |
355 | u_char session_id[16], | |
356 | u_int response_type, | |
357 | u_char response[16]) | |
358 | { | |
359 | Buffer buffer; | |
360 | int success = 0; | |
361 | int i; | |
362 | int type; | |
363 | ||
364 | if (key->type != KEY_RSA1) | |
365 | return 0; | |
366 | if (response_type == 0) { | |
367 | logit("Compatibility with ssh protocol version 1.0 no longer supported."); | |
368 | return 0; | |
369 | } | |
370 | buffer_init(&buffer); | |
371 | buffer_put_char(&buffer, SSH_AGENTC_RSA_CHALLENGE); | |
372 | buffer_put_int(&buffer, BN_num_bits(key->rsa->n)); | |
373 | buffer_put_bignum(&buffer, key->rsa->e); | |
374 | buffer_put_bignum(&buffer, key->rsa->n); | |
375 | buffer_put_bignum(&buffer, challenge); | |
376 | buffer_append(&buffer, session_id, 16); | |
377 | buffer_put_int(&buffer, response_type); | |
378 | ||
379 | if (ssh_request_reply(auth, &buffer, &buffer) == 0) { | |
380 | buffer_free(&buffer); | |
381 | return 0; | |
382 | } | |
383 | type = buffer_get_char(&buffer); | |
384 | ||
385 | if (agent_failed(type)) { | |
386 | logit("Agent admitted failure to authenticate using the key."); | |
387 | } else if (type != SSH_AGENT_RSA_RESPONSE) { | |
388 | fatal("Bad authentication response: %d", type); | |
389 | } else { | |
390 | success = 1; | |
391 | /* | |
392 | * Get the response from the packet. This will abort with a | |
393 | * fatal error if the packet is corrupt. | |
394 | */ | |
395 | for (i = 0; i < 16; i++) | |
396 | response[i] = buffer_get_char(&buffer); | |
397 | } | |
398 | buffer_free(&buffer); | |
399 | return success; | |
400 | } | |
401 | ||
402 | /* ask agent to sign data, returns -1 on error, 0 on success */ | |
403 | int | |
404 | ssh_agent_sign(AuthenticationConnection *auth, | |
405 | Key *key, | |
406 | u_char **sigp, u_int *lenp, | |
407 | u_char *data, u_int datalen) | |
408 | { | |
409 | extern int datafellows; | |
410 | Buffer msg; | |
411 | u_char *blob; | |
412 | u_int blen; | |
413 | int type, flags = 0; | |
414 | int ret = -1; | |
415 | ||
416 | if (key_to_blob(key, &blob, &blen) == 0) | |
417 | return -1; | |
418 | ||
419 | if (datafellows & SSH_BUG_SIGBLOB) | |
420 | flags = SSH_AGENT_OLD_SIGNATURE; | |
421 | ||
422 | buffer_init(&msg); | |
423 | buffer_put_char(&msg, SSH2_AGENTC_SIGN_REQUEST); | |
424 | buffer_put_string(&msg, blob, blen); | |
425 | buffer_put_string(&msg, data, datalen); | |
426 | buffer_put_int(&msg, flags); | |
427 | xfree(blob); | |
428 | ||
429 | if (ssh_request_reply(auth, &msg, &msg) == 0) { | |
430 | buffer_free(&msg); | |
431 | return -1; | |
432 | } | |
433 | type = buffer_get_char(&msg); | |
434 | if (agent_failed(type)) { | |
435 | logit("Agent admitted failure to sign using the key."); | |
436 | } else if (type != SSH2_AGENT_SIGN_RESPONSE) { | |
437 | fatal("Bad authentication response: %d", type); | |
438 | } else { | |
439 | ret = 0; | |
440 | *sigp = buffer_get_string(&msg, lenp); | |
441 | } | |
442 | buffer_free(&msg); | |
443 | return ret; | |
444 | } | |
445 | ||
446 | /* Encode key for a message to the agent. */ | |
447 | ||
448 | static void | |
449 | ssh_encode_identity_rsa1(Buffer *b, RSA *key, const char *comment) | |
450 | { | |
451 | buffer_put_int(b, BN_num_bits(key->n)); | |
452 | buffer_put_bignum(b, key->n); | |
453 | buffer_put_bignum(b, key->e); | |
454 | buffer_put_bignum(b, key->d); | |
455 | /* To keep within the protocol: p < q for ssh. in SSL p > q */ | |
456 | buffer_put_bignum(b, key->iqmp); /* ssh key->u */ | |
457 | buffer_put_bignum(b, key->q); /* ssh key->p, SSL key->q */ | |
458 | buffer_put_bignum(b, key->p); /* ssh key->q, SSL key->p */ | |
459 | buffer_put_cstring(b, comment); | |
460 | } | |
461 | ||
462 | static void | |
463 | ssh_encode_identity_ssh2(Buffer *b, Key *key, const char *comment) | |
464 | { | |
465 | buffer_put_cstring(b, key_ssh_name(key)); | |
466 | switch (key->type) { | |
467 | case KEY_RSA: | |
468 | buffer_put_bignum2(b, key->rsa->n); | |
469 | buffer_put_bignum2(b, key->rsa->e); | |
470 | buffer_put_bignum2(b, key->rsa->d); | |
471 | buffer_put_bignum2(b, key->rsa->iqmp); | |
472 | buffer_put_bignum2(b, key->rsa->p); | |
473 | buffer_put_bignum2(b, key->rsa->q); | |
474 | break; | |
475 | case KEY_DSA: | |
476 | buffer_put_bignum2(b, key->dsa->p); | |
477 | buffer_put_bignum2(b, key->dsa->q); | |
478 | buffer_put_bignum2(b, key->dsa->g); | |
479 | buffer_put_bignum2(b, key->dsa->pub_key); | |
480 | buffer_put_bignum2(b, key->dsa->priv_key); | |
481 | break; | |
482 | } | |
483 | buffer_put_cstring(b, comment); | |
484 | } | |
485 | ||
486 | /* | |
487 | * Adds an identity to the authentication server. This call is not meant to | |
488 | * be used by normal applications. | |
489 | */ | |
490 | ||
491 | int | |
492 | ssh_add_identity_constrained(AuthenticationConnection *auth, Key *key, | |
493 | const char *comment, u_int life, u_int confirm) | |
494 | { | |
495 | Buffer msg; | |
496 | int type, constrained = (life || confirm); | |
497 | ||
498 | buffer_init(&msg); | |
499 | ||
500 | switch (key->type) { | |
501 | case KEY_RSA1: | |
502 | type = constrained ? | |
503 | SSH_AGENTC_ADD_RSA_ID_CONSTRAINED : | |
504 | SSH_AGENTC_ADD_RSA_IDENTITY; | |
505 | buffer_put_char(&msg, type); | |
506 | ssh_encode_identity_rsa1(&msg, key->rsa, comment); | |
507 | break; | |
508 | case KEY_RSA: | |
509 | case KEY_DSA: | |
510 | type = constrained ? | |
511 | SSH2_AGENTC_ADD_ID_CONSTRAINED : | |
512 | SSH2_AGENTC_ADD_IDENTITY; | |
513 | buffer_put_char(&msg, type); | |
514 | ssh_encode_identity_ssh2(&msg, key, comment); | |
515 | break; | |
516 | default: | |
517 | buffer_free(&msg); | |
518 | return 0; | |
519 | break; | |
520 | } | |
521 | if (constrained) { | |
522 | if (life != 0) { | |
523 | buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME); | |
524 | buffer_put_int(&msg, life); | |
525 | } | |
526 | if (confirm != 0) | |
527 | buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_CONFIRM); | |
528 | } | |
529 | if (ssh_request_reply(auth, &msg, &msg) == 0) { | |
530 | buffer_free(&msg); | |
531 | return 0; | |
532 | } | |
533 | type = buffer_get_char(&msg); | |
534 | buffer_free(&msg); | |
535 | return decode_reply(type); | |
536 | } | |
537 | ||
538 | int | |
539 | ssh_add_identity(AuthenticationConnection *auth, Key *key, const char *comment) | |
540 | { | |
541 | return ssh_add_identity_constrained(auth, key, comment, 0, 0); | |
542 | } | |
543 | ||
544 | /* | |
545 | * Removes an identity from the authentication server. This call is not | |
546 | * meant to be used by normal applications. | |
547 | */ | |
548 | ||
549 | int | |
550 | ssh_remove_identity(AuthenticationConnection *auth, Key *key) | |
551 | { | |
552 | Buffer msg; | |
553 | int type; | |
554 | u_char *blob; | |
555 | u_int blen; | |
556 | ||
557 | buffer_init(&msg); | |
558 | ||
559 | if (key->type == KEY_RSA1) { | |
560 | buffer_put_char(&msg, SSH_AGENTC_REMOVE_RSA_IDENTITY); | |
561 | buffer_put_int(&msg, BN_num_bits(key->rsa->n)); | |
562 | buffer_put_bignum(&msg, key->rsa->e); | |
563 | buffer_put_bignum(&msg, key->rsa->n); | |
564 | } else if (key->type == KEY_DSA || key->type == KEY_RSA) { | |
565 | key_to_blob(key, &blob, &blen); | |
566 | buffer_put_char(&msg, SSH2_AGENTC_REMOVE_IDENTITY); | |
567 | buffer_put_string(&msg, blob, blen); | |
568 | xfree(blob); | |
569 | } else { | |
570 | buffer_free(&msg); | |
571 | return 0; | |
572 | } | |
573 | if (ssh_request_reply(auth, &msg, &msg) == 0) { | |
574 | buffer_free(&msg); | |
575 | return 0; | |
576 | } | |
577 | type = buffer_get_char(&msg); | |
578 | buffer_free(&msg); | |
579 | return decode_reply(type); | |
580 | } | |
581 | ||
582 | int | |
583 | ssh_update_card(AuthenticationConnection *auth, int add, | |
584 | const char *reader_id, const char *pin, u_int life, u_int confirm) | |
585 | { | |
586 | Buffer msg; | |
587 | int type, constrained = (life || confirm); | |
588 | ||
589 | if (add) { | |
590 | type = constrained ? | |
591 | SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED : | |
592 | SSH_AGENTC_ADD_SMARTCARD_KEY; | |
593 | } else | |
594 | type = SSH_AGENTC_REMOVE_SMARTCARD_KEY; | |
595 | ||
596 | buffer_init(&msg); | |
597 | buffer_put_char(&msg, type); | |
598 | buffer_put_cstring(&msg, reader_id); | |
599 | buffer_put_cstring(&msg, pin); | |
600 | ||
601 | if (constrained) { | |
602 | if (life != 0) { | |
603 | buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME); | |
604 | buffer_put_int(&msg, life); | |
605 | } | |
606 | if (confirm != 0) | |
607 | buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_CONFIRM); | |
608 | } | |
609 | ||
610 | if (ssh_request_reply(auth, &msg, &msg) == 0) { | |
611 | buffer_free(&msg); | |
612 | return 0; | |
613 | } | |
614 | type = buffer_get_char(&msg); | |
615 | buffer_free(&msg); | |
616 | return decode_reply(type); | |
617 | } | |
618 | ||
619 | /* | |
620 | * Removes all identities from the agent. This call is not meant to be used | |
621 | * by normal applications. | |
622 | */ | |
623 | ||
624 | int | |
625 | ssh_remove_all_identities(AuthenticationConnection *auth, int version) | |
626 | { | |
627 | Buffer msg; | |
628 | int type; | |
629 | int code = (version==1) ? | |
630 | SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES : | |
631 | SSH2_AGENTC_REMOVE_ALL_IDENTITIES; | |
632 | ||
633 | buffer_init(&msg); | |
634 | buffer_put_char(&msg, code); | |
635 | ||
636 | if (ssh_request_reply(auth, &msg, &msg) == 0) { | |
637 | buffer_free(&msg); | |
638 | return 0; | |
639 | } | |
640 | type = buffer_get_char(&msg); | |
641 | buffer_free(&msg); | |
642 | return decode_reply(type); | |
643 | } | |
644 | ||
645 | int | |
646 | decode_reply(int type) | |
647 | { | |
648 | switch (type) { | |
649 | case SSH_AGENT_FAILURE: | |
650 | case SSH_COM_AGENT2_FAILURE: | |
651 | case SSH2_AGENT_FAILURE: | |
652 | logit("SSH_AGENT_FAILURE"); | |
653 | return 0; | |
654 | case SSH_AGENT_SUCCESS: | |
655 | return 1; | |
656 | default: | |
657 | fatal("Bad response from authentication agent: %d", type); | |
658 | } | |
659 | /* NOTREACHED */ | |
660 | return 0; | |
661 | } |