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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 1.63 2003/11/21 11:57:03 djm 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 | len = 4; | |
137 | while (len > 0) { | |
138 | l = read(auth->fd, buf + 4 - len, len); | |
139 | if (l == -1 && (errno == EAGAIN || errno == EINTR)) | |
140 | continue; | |
141 | if (l <= 0) { | |
142 | error("Error reading response length from authentication socket."); | |
143 | return 0; | |
144 | } | |
145 | len -= l; | |
146 | } | |
147 | ||
148 | /* Extract the length, and check it for sanity. */ | |
149 | len = GET_32BIT(buf); | |
150 | if (len > 256 * 1024) | |
151 | fatal("Authentication response too long: %u", len); | |
152 | ||
153 | /* Read the rest of the response in to the buffer. */ | |
154 | buffer_clear(reply); | |
155 | while (len > 0) { | |
156 | l = len; | |
157 | if (l > sizeof(buf)) | |
158 | l = sizeof(buf); | |
159 | l = read(auth->fd, buf, l); | |
160 | if (l == -1 && (errno == EAGAIN || errno == EINTR)) | |
161 | continue; | |
162 | if (l <= 0) { | |
163 | error("Error reading response from authentication socket."); | |
164 | return 0; | |
165 | } | |
166 | buffer_append(reply, buf, l); | |
167 | len -= l; | |
168 | } | |
169 | return 1; | |
170 | } | |
171 | ||
172 | /* | |
173 | * Closes the agent socket if it should be closed (depends on how it was | |
174 | * obtained). The argument must have been returned by | |
175 | * ssh_get_authentication_socket(). | |
176 | */ | |
177 | ||
178 | void | |
179 | ssh_close_authentication_socket(int sock) | |
180 | { | |
181 | if (getenv(SSH_AUTHSOCKET_ENV_NAME)) | |
182 | close(sock); | |
183 | } | |
184 | ||
185 | /* | |
186 | * Opens and connects a private socket for communication with the | |
187 | * authentication agent. Returns the file descriptor (which must be | |
188 | * shut down and closed by the caller when no longer needed). | |
189 | * Returns NULL if an error occurred and the connection could not be | |
190 | * opened. | |
191 | */ | |
192 | ||
193 | AuthenticationConnection * | |
194 | ssh_get_authentication_connection(void) | |
195 | { | |
196 | AuthenticationConnection *auth; | |
197 | int sock; | |
198 | ||
199 | sock = ssh_get_authentication_socket(); | |
200 | ||
201 | /* | |
202 | * Fail if we couldn't obtain a connection. This happens if we | |
203 | * exited due to a timeout. | |
204 | */ | |
205 | if (sock < 0) | |
206 | return NULL; | |
207 | ||
208 | auth = xmalloc(sizeof(*auth)); | |
209 | auth->fd = sock; | |
210 | buffer_init(&auth->identities); | |
211 | auth->howmany = 0; | |
212 | ||
213 | return auth; | |
214 | } | |
215 | ||
216 | /* | |
217 | * Closes the connection to the authentication agent and frees any associated | |
218 | * memory. | |
219 | */ | |
220 | ||
221 | void | |
222 | ssh_close_authentication_connection(AuthenticationConnection *auth) | |
223 | { | |
224 | buffer_free(&auth->identities); | |
225 | close(auth->fd); | |
226 | xfree(auth); | |
227 | } | |
228 | ||
229 | /* Lock/unlock agent */ | |
230 | int | |
231 | ssh_lock_agent(AuthenticationConnection *auth, int lock, const char *password) | |
232 | { | |
233 | int type; | |
234 | Buffer msg; | |
235 | ||
236 | buffer_init(&msg); | |
237 | buffer_put_char(&msg, lock ? SSH_AGENTC_LOCK : SSH_AGENTC_UNLOCK); | |
238 | buffer_put_cstring(&msg, password); | |
239 | ||
240 | if (ssh_request_reply(auth, &msg, &msg) == 0) { | |
241 | buffer_free(&msg); | |
242 | return 0; | |
243 | } | |
244 | type = buffer_get_char(&msg); | |
245 | buffer_free(&msg); | |
246 | return decode_reply(type); | |
247 | } | |
248 | ||
249 | /* | |
250 | * Returns the first authentication identity held by the agent. | |
251 | */ | |
252 | ||
253 | int | |
254 | ssh_get_num_identities(AuthenticationConnection *auth, int version) | |
255 | { | |
256 | int type, code1 = 0, code2 = 0; | |
257 | Buffer request; | |
258 | ||
259 | switch (version) { | |
260 | case 1: | |
261 | code1 = SSH_AGENTC_REQUEST_RSA_IDENTITIES; | |
262 | code2 = SSH_AGENT_RSA_IDENTITIES_ANSWER; | |
263 | break; | |
264 | case 2: | |
265 | code1 = SSH2_AGENTC_REQUEST_IDENTITIES; | |
266 | code2 = SSH2_AGENT_IDENTITIES_ANSWER; | |
267 | break; | |
268 | default: | |
269 | return 0; | |
270 | } | |
271 | ||
272 | /* | |
273 | * Send a message to the agent requesting for a list of the | |
274 | * identities it can represent. | |
275 | */ | |
276 | buffer_init(&request); | |
277 | buffer_put_char(&request, code1); | |
278 | ||
279 | buffer_clear(&auth->identities); | |
280 | if (ssh_request_reply(auth, &request, &auth->identities) == 0) { | |
281 | buffer_free(&request); | |
282 | return 0; | |
283 | } | |
284 | buffer_free(&request); | |
285 | ||
286 | /* Get message type, and verify that we got a proper answer. */ | |
287 | type = buffer_get_char(&auth->identities); | |
288 | if (agent_failed(type)) { | |
289 | return 0; | |
290 | } else if (type != code2) { | |
291 | fatal("Bad authentication reply message type: %d", type); | |
292 | } | |
293 | ||
294 | /* Get the number of entries in the response and check it for sanity. */ | |
295 | auth->howmany = buffer_get_int(&auth->identities); | |
296 | if ((u_int)auth->howmany > 1024) | |
297 | fatal("Too many identities in authentication reply: %d", | |
298 | auth->howmany); | |
299 | ||
300 | return auth->howmany; | |
301 | } | |
302 | ||
303 | Key * | |
304 | ssh_get_first_identity(AuthenticationConnection *auth, char **comment, int version) | |
305 | { | |
306 | /* get number of identities and return the first entry (if any). */ | |
307 | if (ssh_get_num_identities(auth, version) > 0) | |
308 | return ssh_get_next_identity(auth, comment, version); | |
309 | return NULL; | |
310 | } | |
311 | ||
312 | Key * | |
313 | ssh_get_next_identity(AuthenticationConnection *auth, char **comment, int version) | |
314 | { | |
315 | u_int bits; | |
316 | u_char *blob; | |
317 | u_int blen; | |
318 | Key *key = NULL; | |
319 | ||
320 | /* Return failure if no more entries. */ | |
321 | if (auth->howmany <= 0) | |
322 | return NULL; | |
323 | ||
324 | /* | |
325 | * Get the next entry from the packet. These will abort with a fatal | |
326 | * error if the packet is too short or contains corrupt data. | |
327 | */ | |
328 | switch (version) { | |
329 | case 1: | |
330 | key = key_new(KEY_RSA1); | |
331 | bits = buffer_get_int(&auth->identities); | |
332 | buffer_get_bignum(&auth->identities, key->rsa->e); | |
333 | buffer_get_bignum(&auth->identities, key->rsa->n); | |
334 | *comment = buffer_get_string(&auth->identities, NULL); | |
335 | if (bits != BN_num_bits(key->rsa->n)) | |
336 | logit("Warning: identity keysize mismatch: actual %d, announced %u", | |
337 | BN_num_bits(key->rsa->n), bits); | |
338 | break; | |
339 | case 2: | |
340 | blob = buffer_get_string(&auth->identities, &blen); | |
341 | *comment = buffer_get_string(&auth->identities, NULL); | |
342 | key = key_from_blob(blob, blen); | |
343 | xfree(blob); | |
344 | break; | |
345 | default: | |
346 | return NULL; | |
347 | break; | |
348 | } | |
349 | /* Decrement the number of remaining entries. */ | |
350 | auth->howmany--; | |
351 | return key; | |
352 | } | |
353 | ||
354 | /* | |
355 | * Generates a random challenge, sends it to the agent, and waits for | |
356 | * response from the agent. Returns true (non-zero) if the agent gave the | |
357 | * correct answer, zero otherwise. Response type selects the style of | |
358 | * response desired, with 0 corresponding to protocol version 1.0 (no longer | |
359 | * supported) and 1 corresponding to protocol version 1.1. | |
360 | */ | |
361 | ||
362 | int | |
363 | ssh_decrypt_challenge(AuthenticationConnection *auth, | |
364 | Key* key, BIGNUM *challenge, | |
365 | u_char session_id[16], | |
366 | u_int response_type, | |
367 | u_char response[16]) | |
368 | { | |
369 | Buffer buffer; | |
370 | int success = 0; | |
371 | int i; | |
372 | int type; | |
373 | ||
374 | if (key->type != KEY_RSA1) | |
375 | return 0; | |
376 | if (response_type == 0) { | |
377 | logit("Compatibility with ssh protocol version 1.0 no longer supported."); | |
378 | return 0; | |
379 | } | |
380 | buffer_init(&buffer); | |
381 | buffer_put_char(&buffer, SSH_AGENTC_RSA_CHALLENGE); | |
382 | buffer_put_int(&buffer, BN_num_bits(key->rsa->n)); | |
383 | buffer_put_bignum(&buffer, key->rsa->e); | |
384 | buffer_put_bignum(&buffer, key->rsa->n); | |
385 | buffer_put_bignum(&buffer, challenge); | |
386 | buffer_append(&buffer, session_id, 16); | |
387 | buffer_put_int(&buffer, response_type); | |
388 | ||
389 | if (ssh_request_reply(auth, &buffer, &buffer) == 0) { | |
390 | buffer_free(&buffer); | |
391 | return 0; | |
392 | } | |
393 | type = buffer_get_char(&buffer); | |
394 | ||
395 | if (agent_failed(type)) { | |
396 | logit("Agent admitted failure to authenticate using the key."); | |
397 | } else if (type != SSH_AGENT_RSA_RESPONSE) { | |
398 | fatal("Bad authentication response: %d", type); | |
399 | } else { | |
400 | success = 1; | |
401 | /* | |
402 | * Get the response from the packet. This will abort with a | |
403 | * fatal error if the packet is corrupt. | |
404 | */ | |
405 | for (i = 0; i < 16; i++) | |
406 | response[i] = buffer_get_char(&buffer); | |
407 | } | |
408 | buffer_free(&buffer); | |
409 | return success; | |
410 | } | |
411 | ||
412 | /* ask agent to sign data, returns -1 on error, 0 on success */ | |
413 | int | |
414 | ssh_agent_sign(AuthenticationConnection *auth, | |
415 | Key *key, | |
416 | u_char **sigp, u_int *lenp, | |
417 | u_char *data, u_int datalen) | |
418 | { | |
419 | extern int datafellows; | |
420 | Buffer msg; | |
421 | u_char *blob; | |
422 | u_int blen; | |
423 | int type, flags = 0; | |
424 | int ret = -1; | |
425 | ||
426 | if (key_to_blob(key, &blob, &blen) == 0) | |
427 | return -1; | |
428 | ||
429 | if (datafellows & SSH_BUG_SIGBLOB) | |
430 | flags = SSH_AGENT_OLD_SIGNATURE; | |
431 | ||
432 | buffer_init(&msg); | |
433 | buffer_put_char(&msg, SSH2_AGENTC_SIGN_REQUEST); | |
434 | buffer_put_string(&msg, blob, blen); | |
435 | buffer_put_string(&msg, data, datalen); | |
436 | buffer_put_int(&msg, flags); | |
437 | xfree(blob); | |
438 | ||
439 | if (ssh_request_reply(auth, &msg, &msg) == 0) { | |
440 | buffer_free(&msg); | |
441 | return -1; | |
442 | } | |
443 | type = buffer_get_char(&msg); | |
444 | if (agent_failed(type)) { | |
445 | logit("Agent admitted failure to sign using the key."); | |
446 | } else if (type != SSH2_AGENT_SIGN_RESPONSE) { | |
447 | fatal("Bad authentication response: %d", type); | |
448 | } else { | |
449 | ret = 0; | |
450 | *sigp = buffer_get_string(&msg, lenp); | |
451 | } | |
452 | buffer_free(&msg); | |
453 | return ret; | |
454 | } | |
455 | ||
456 | /* Encode key for a message to the agent. */ | |
457 | ||
458 | static void | |
459 | ssh_encode_identity_rsa1(Buffer *b, RSA *key, const char *comment) | |
460 | { | |
461 | buffer_put_int(b, BN_num_bits(key->n)); | |
462 | buffer_put_bignum(b, key->n); | |
463 | buffer_put_bignum(b, key->e); | |
464 | buffer_put_bignum(b, key->d); | |
465 | /* To keep within the protocol: p < q for ssh. in SSL p > q */ | |
466 | buffer_put_bignum(b, key->iqmp); /* ssh key->u */ | |
467 | buffer_put_bignum(b, key->q); /* ssh key->p, SSL key->q */ | |
468 | buffer_put_bignum(b, key->p); /* ssh key->q, SSL key->p */ | |
469 | buffer_put_cstring(b, comment); | |
470 | } | |
471 | ||
472 | static void | |
473 | ssh_encode_identity_ssh2(Buffer *b, Key *key, const char *comment) | |
474 | { | |
475 | buffer_put_cstring(b, key_ssh_name(key)); | |
476 | switch (key->type) { | |
477 | case KEY_RSA: | |
478 | buffer_put_bignum2(b, key->rsa->n); | |
479 | buffer_put_bignum2(b, key->rsa->e); | |
480 | buffer_put_bignum2(b, key->rsa->d); | |
481 | buffer_put_bignum2(b, key->rsa->iqmp); | |
482 | buffer_put_bignum2(b, key->rsa->p); | |
483 | buffer_put_bignum2(b, key->rsa->q); | |
484 | break; | |
485 | case KEY_DSA: | |
486 | buffer_put_bignum2(b, key->dsa->p); | |
487 | buffer_put_bignum2(b, key->dsa->q); | |
488 | buffer_put_bignum2(b, key->dsa->g); | |
489 | buffer_put_bignum2(b, key->dsa->pub_key); | |
490 | buffer_put_bignum2(b, key->dsa->priv_key); | |
491 | break; | |
492 | } | |
493 | buffer_put_cstring(b, comment); | |
494 | } | |
495 | ||
496 | /* | |
497 | * Adds an identity to the authentication server. This call is not meant to | |
498 | * be used by normal applications. | |
499 | */ | |
500 | ||
501 | int | |
502 | ssh_add_identity_constrained(AuthenticationConnection *auth, Key *key, | |
503 | const char *comment, u_int life, u_int confirm) | |
504 | { | |
505 | Buffer msg; | |
506 | int type, constrained = (life || confirm); | |
507 | ||
508 | buffer_init(&msg); | |
509 | ||
510 | switch (key->type) { | |
511 | case KEY_RSA1: | |
512 | type = constrained ? | |
513 | SSH_AGENTC_ADD_RSA_ID_CONSTRAINED : | |
514 | SSH_AGENTC_ADD_RSA_IDENTITY; | |
515 | buffer_put_char(&msg, type); | |
516 | ssh_encode_identity_rsa1(&msg, key->rsa, comment); | |
517 | break; | |
518 | case KEY_RSA: | |
519 | case KEY_DSA: | |
520 | type = constrained ? | |
521 | SSH2_AGENTC_ADD_ID_CONSTRAINED : | |
522 | SSH2_AGENTC_ADD_IDENTITY; | |
523 | buffer_put_char(&msg, type); | |
524 | ssh_encode_identity_ssh2(&msg, key, comment); | |
525 | break; | |
526 | default: | |
527 | buffer_free(&msg); | |
528 | return 0; | |
529 | break; | |
530 | } | |
531 | if (constrained) { | |
532 | if (life != 0) { | |
533 | buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME); | |
534 | buffer_put_int(&msg, life); | |
535 | } | |
536 | if (confirm != 0) | |
537 | buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_CONFIRM); | |
538 | } | |
539 | if (ssh_request_reply(auth, &msg, &msg) == 0) { | |
540 | buffer_free(&msg); | |
541 | return 0; | |
542 | } | |
543 | type = buffer_get_char(&msg); | |
544 | buffer_free(&msg); | |
545 | return decode_reply(type); | |
546 | } | |
547 | ||
548 | int | |
549 | ssh_add_identity(AuthenticationConnection *auth, Key *key, const char *comment) | |
550 | { | |
551 | return ssh_add_identity_constrained(auth, key, comment, 0, 0); | |
552 | } | |
553 | ||
554 | /* | |
555 | * Removes an identity from the authentication server. This call is not | |
556 | * meant to be used by normal applications. | |
557 | */ | |
558 | ||
559 | int | |
560 | ssh_remove_identity(AuthenticationConnection *auth, Key *key) | |
561 | { | |
562 | Buffer msg; | |
563 | int type; | |
564 | u_char *blob; | |
565 | u_int blen; | |
566 | ||
567 | buffer_init(&msg); | |
568 | ||
569 | if (key->type == KEY_RSA1) { | |
570 | buffer_put_char(&msg, SSH_AGENTC_REMOVE_RSA_IDENTITY); | |
571 | buffer_put_int(&msg, BN_num_bits(key->rsa->n)); | |
572 | buffer_put_bignum(&msg, key->rsa->e); | |
573 | buffer_put_bignum(&msg, key->rsa->n); | |
574 | } else if (key->type == KEY_DSA || key->type == KEY_RSA) { | |
575 | key_to_blob(key, &blob, &blen); | |
576 | buffer_put_char(&msg, SSH2_AGENTC_REMOVE_IDENTITY); | |
577 | buffer_put_string(&msg, blob, blen); | |
578 | xfree(blob); | |
579 | } else { | |
580 | buffer_free(&msg); | |
581 | return 0; | |
582 | } | |
583 | if (ssh_request_reply(auth, &msg, &msg) == 0) { | |
584 | buffer_free(&msg); | |
585 | return 0; | |
586 | } | |
587 | type = buffer_get_char(&msg); | |
588 | buffer_free(&msg); | |
589 | return decode_reply(type); | |
590 | } | |
591 | ||
592 | int | |
593 | ssh_update_card(AuthenticationConnection *auth, int add, | |
594 | const char *reader_id, const char *pin, u_int life, u_int confirm) | |
595 | { | |
596 | Buffer msg; | |
597 | int type, constrained = (life || confirm); | |
598 | ||
599 | if (add) { | |
600 | type = constrained ? | |
601 | SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED : | |
602 | SSH_AGENTC_ADD_SMARTCARD_KEY; | |
603 | } else | |
604 | type = SSH_AGENTC_REMOVE_SMARTCARD_KEY; | |
605 | ||
606 | buffer_init(&msg); | |
607 | buffer_put_char(&msg, type); | |
608 | buffer_put_cstring(&msg, reader_id); | |
609 | buffer_put_cstring(&msg, pin); | |
610 | ||
611 | if (constrained) { | |
612 | if (life != 0) { | |
613 | buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME); | |
614 | buffer_put_int(&msg, life); | |
615 | } | |
616 | if (confirm != 0) | |
617 | buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_CONFIRM); | |
618 | } | |
619 | ||
620 | if (ssh_request_reply(auth, &msg, &msg) == 0) { | |
621 | buffer_free(&msg); | |
622 | return 0; | |
623 | } | |
624 | type = buffer_get_char(&msg); | |
625 | buffer_free(&msg); | |
626 | return decode_reply(type); | |
627 | } | |
628 | ||
629 | /* | |
630 | * Removes all identities from the agent. This call is not meant to be used | |
631 | * by normal applications. | |
632 | */ | |
633 | ||
634 | int | |
635 | ssh_remove_all_identities(AuthenticationConnection *auth, int version) | |
636 | { | |
637 | Buffer msg; | |
638 | int type; | |
639 | int code = (version==1) ? | |
640 | SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES : | |
641 | SSH2_AGENTC_REMOVE_ALL_IDENTITIES; | |
642 | ||
643 | buffer_init(&msg); | |
644 | buffer_put_char(&msg, code); | |
645 | ||
646 | if (ssh_request_reply(auth, &msg, &msg) == 0) { | |
647 | buffer_free(&msg); | |
648 | return 0; | |
649 | } | |
650 | type = buffer_get_char(&msg); | |
651 | buffer_free(&msg); | |
652 | return decode_reply(type); | |
653 | } | |
654 | ||
655 | int | |
656 | decode_reply(int type) | |
657 | { | |
658 | switch (type) { | |
659 | case SSH_AGENT_FAILURE: | |
660 | case SSH_COM_AGENT2_FAILURE: | |
661 | case SSH2_AGENT_FAILURE: | |
662 | logit("SSH_AGENT_FAILURE"); | |
663 | return 0; | |
664 | case SSH_AGENT_SUCCESS: | |
665 | return 1; | |
666 | default: | |
667 | fatal("Bad response from authentication agent: %d", type); | |
668 | } | |
669 | /* NOTREACHED */ | |
670 | return 0; | |
671 | } |