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1 | /* $OpenBSD: authfd.c,v 1.79 2006/07/26 13:57:17 stevesk Exp $ */ | |
2 | /* | |
3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
5 | * All rights reserved | |
6 | * Functions for connecting the local authentication agent. | |
7 | * | |
8 | * As far as I am concerned, the code I have written for this software | |
9 | * can be used freely for any purpose. Any derived versions of this | |
10 | * software must be clearly marked as such, and if the derived work is | |
11 | * incompatible with the protocol description in the RFC file, it must be | |
12 | * called by a name other than "ssh" or "Secure Shell". | |
13 | * | |
14 | * SSH2 implementation, | |
15 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
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. | |
36 | */ | |
37 | ||
38 | #include "includes.h" | |
39 | ||
40 | #include <sys/types.h> | |
41 | #include <sys/un.h> | |
42 | #include <sys/socket.h> | |
43 | ||
44 | #include <openssl/evp.h> | |
45 | ||
46 | #include <fcntl.h> | |
47 | #include <stdlib.h> | |
48 | #include <string.h> | |
49 | #include <unistd.h> | |
50 | ||
51 | #include "ssh.h" | |
52 | #include "rsa.h" | |
53 | #include "buffer.h" | |
54 | #include "bufaux.h" | |
55 | #include "xmalloc.h" | |
56 | #include "key.h" | |
57 | #include "authfd.h" | |
58 | #include "cipher.h" | |
59 | #include "kex.h" | |
60 | #include "compat.h" | |
61 | #include "log.h" | |
62 | #include "atomicio.h" | |
63 | #include "misc.h" | |
64 | ||
65 | static int agent_present = 0; | |
66 | ||
67 | /* helper */ | |
68 | int decode_reply(int type); | |
69 | ||
70 | /* macro to check for "agent failure" message */ | |
71 | #define agent_failed(x) \ | |
72 | ((x == SSH_AGENT_FAILURE) || (x == SSH_COM_AGENT2_FAILURE) || \ | |
73 | (x == SSH2_AGENT_FAILURE)) | |
74 | ||
75 | int | |
76 | ssh_agent_present(void) | |
77 | { | |
78 | int authfd; | |
79 | ||
80 | if (agent_present) | |
81 | return 1; | |
82 | if ((authfd = ssh_get_authentication_socket()) == -1) | |
83 | return 0; | |
84 | else { | |
85 | ssh_close_authentication_socket(authfd); | |
86 | return 1; | |
87 | } | |
88 | } | |
89 | ||
90 | /* Returns the number of the authentication fd, or -1 if there is none. */ | |
91 | ||
92 | int | |
93 | ssh_get_authentication_socket(void) | |
94 | { | |
95 | const char *authsocket; | |
96 | int sock; | |
97 | struct sockaddr_un sunaddr; | |
98 | ||
99 | authsocket = getenv(SSH_AUTHSOCKET_ENV_NAME); | |
100 | if (!authsocket) | |
101 | return -1; | |
102 | ||
103 | sunaddr.sun_family = AF_UNIX; | |
104 | strlcpy(sunaddr.sun_path, authsocket, sizeof(sunaddr.sun_path)); | |
105 | ||
106 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
107 | if (sock < 0) | |
108 | return -1; | |
109 | ||
110 | /* close on exec */ | |
111 | if (fcntl(sock, F_SETFD, 1) == -1) { | |
112 | close(sock); | |
113 | return -1; | |
114 | } | |
115 | if (connect(sock, (struct sockaddr *)&sunaddr, sizeof sunaddr) < 0) { | |
116 | close(sock); | |
117 | return -1; | |
118 | } | |
119 | agent_present = 1; | |
120 | return sock; | |
121 | } | |
122 | ||
123 | static int | |
124 | ssh_request_reply(AuthenticationConnection *auth, Buffer *request, Buffer *reply) | |
125 | { | |
126 | u_int l, len; | |
127 | char buf[1024]; | |
128 | ||
129 | /* Get the length of the message, and format it in the buffer. */ | |
130 | len = buffer_len(request); | |
131 | put_u32(buf, len); | |
132 | ||
133 | /* Send the length and then the packet to the agent. */ | |
134 | if (atomicio(vwrite, auth->fd, buf, 4) != 4 || | |
135 | atomicio(vwrite, auth->fd, buffer_ptr(request), | |
136 | buffer_len(request)) != buffer_len(request)) { | |
137 | error("Error writing to authentication socket."); | |
138 | return 0; | |
139 | } | |
140 | /* | |
141 | * Wait for response from the agent. First read the length of the | |
142 | * response packet. | |
143 | */ | |
144 | if (atomicio(read, auth->fd, buf, 4) != 4) { | |
145 | error("Error reading response length from authentication socket."); | |
146 | return 0; | |
147 | } | |
148 | ||
149 | /* Extract the length, and check it for sanity. */ | |
150 | len = get_u32(buf); | |
151 | if (len > 256 * 1024) | |
152 | fatal("Authentication response too long: %u", len); | |
153 | ||
154 | /* Read the rest of the response in to the buffer. */ | |
155 | buffer_clear(reply); | |
156 | while (len > 0) { | |
157 | l = len; | |
158 | if (l > sizeof(buf)) | |
159 | l = sizeof(buf); | |
160 | if (atomicio(read, auth->fd, buf, l) != l) { | |
161 | error("Error reading response from authentication socket."); | |
162 | return 0; | |
163 | } | |
164 | buffer_append(reply, buf, l); | |
165 | len -= l; | |
166 | } | |
167 | return 1; | |
168 | } | |
169 | ||
170 | /* | |
171 | * Closes the agent socket if it should be closed (depends on how it was | |
172 | * obtained). The argument must have been returned by | |
173 | * ssh_get_authentication_socket(). | |
174 | */ | |
175 | ||
176 | void | |
177 | ssh_close_authentication_socket(int sock) | |
178 | { | |
179 | if (getenv(SSH_AUTHSOCKET_ENV_NAME)) | |
180 | close(sock); | |
181 | } | |
182 | ||
183 | /* | |
184 | * Opens and connects a private socket for communication with the | |
185 | * authentication agent. Returns the file descriptor (which must be | |
186 | * shut down and closed by the caller when no longer needed). | |
187 | * Returns NULL if an error occurred and the connection could not be | |
188 | * opened. | |
189 | */ | |
190 | ||
191 | AuthenticationConnection * | |
192 | ssh_get_authentication_connection(void) | |
193 | { | |
194 | AuthenticationConnection *auth; | |
195 | int sock; | |
196 | ||
197 | sock = ssh_get_authentication_socket(); | |
198 | ||
199 | /* | |
200 | * Fail if we couldn't obtain a connection. This happens if we | |
201 | * exited due to a timeout. | |
202 | */ | |
203 | if (sock < 0) | |
204 | return NULL; | |
205 | ||
206 | auth = xmalloc(sizeof(*auth)); | |
207 | auth->fd = sock; | |
208 | buffer_init(&auth->identities); | |
209 | auth->howmany = 0; | |
210 | ||
211 | return auth; | |
212 | } | |
213 | ||
214 | /* | |
215 | * Closes the connection to the authentication agent and frees any associated | |
216 | * memory. | |
217 | */ | |
218 | ||
219 | void | |
220 | ssh_close_authentication_connection(AuthenticationConnection *auth) | |
221 | { | |
222 | buffer_free(&auth->identities); | |
223 | close(auth->fd); | |
224 | xfree(auth); | |
225 | } | |
226 | ||
227 | /* Lock/unlock agent */ | |
228 | int | |
229 | ssh_lock_agent(AuthenticationConnection *auth, int lock, const char *password) | |
230 | { | |
231 | int type; | |
232 | Buffer msg; | |
233 | ||
234 | buffer_init(&msg); | |
235 | buffer_put_char(&msg, lock ? SSH_AGENTC_LOCK : SSH_AGENTC_UNLOCK); | |
236 | buffer_put_cstring(&msg, password); | |
237 | ||
238 | if (ssh_request_reply(auth, &msg, &msg) == 0) { | |
239 | buffer_free(&msg); | |
240 | return 0; | |
241 | } | |
242 | type = buffer_get_char(&msg); | |
243 | buffer_free(&msg); | |
244 | return decode_reply(type); | |
245 | } | |
246 | ||
247 | /* | |
248 | * Returns the first authentication identity held by the agent. | |
249 | */ | |
250 | ||
251 | int | |
252 | ssh_get_num_identities(AuthenticationConnection *auth, int version) | |
253 | { | |
254 | int type, code1 = 0, code2 = 0; | |
255 | Buffer request; | |
256 | ||
257 | switch (version) { | |
258 | case 1: | |
259 | code1 = SSH_AGENTC_REQUEST_RSA_IDENTITIES; | |
260 | code2 = SSH_AGENT_RSA_IDENTITIES_ANSWER; | |
261 | break; | |
262 | case 2: | |
263 | code1 = SSH2_AGENTC_REQUEST_IDENTITIES; | |
264 | code2 = SSH2_AGENT_IDENTITIES_ANSWER; | |
265 | break; | |
266 | default: | |
267 | return 0; | |
268 | } | |
269 | ||
270 | /* | |
271 | * Send a message to the agent requesting for a list of the | |
272 | * identities it can represent. | |
273 | */ | |
274 | buffer_init(&request); | |
275 | buffer_put_char(&request, code1); | |
276 | ||
277 | buffer_clear(&auth->identities); | |
278 | if (ssh_request_reply(auth, &request, &auth->identities) == 0) { | |
279 | buffer_free(&request); | |
280 | return 0; | |
281 | } | |
282 | buffer_free(&request); | |
283 | ||
284 | /* Get message type, and verify that we got a proper answer. */ | |
285 | type = buffer_get_char(&auth->identities); | |
286 | if (agent_failed(type)) { | |
287 | return 0; | |
288 | } else if (type != code2) { | |
289 | fatal("Bad authentication reply message type: %d", type); | |
290 | } | |
291 | ||
292 | /* Get the number of entries in the response and check it for sanity. */ | |
293 | auth->howmany = buffer_get_int(&auth->identities); | |
294 | if ((u_int)auth->howmany > 1024) | |
295 | fatal("Too many identities in authentication reply: %d", | |
296 | auth->howmany); | |
297 | ||
298 | return auth->howmany; | |
299 | } | |
300 | ||
301 | Key * | |
302 | ssh_get_first_identity(AuthenticationConnection *auth, char **comment, int version) | |
303 | { | |
304 | /* get number of identities and return the first entry (if any). */ | |
305 | if (ssh_get_num_identities(auth, version) > 0) | |
306 | return ssh_get_next_identity(auth, comment, version); | |
307 | return NULL; | |
308 | } | |
309 | ||
310 | Key * | |
311 | ssh_get_next_identity(AuthenticationConnection *auth, char **comment, int version) | |
312 | { | |
313 | int keybits; | |
314 | u_int bits; | |
315 | u_char *blob; | |
316 | u_int blen; | |
317 | Key *key = NULL; | |
318 | ||
319 | /* Return failure if no more entries. */ | |
320 | if (auth->howmany <= 0) | |
321 | return NULL; | |
322 | ||
323 | /* | |
324 | * Get the next entry from the packet. These will abort with a fatal | |
325 | * error if the packet is too short or contains corrupt data. | |
326 | */ | |
327 | switch (version) { | |
328 | case 1: | |
329 | key = key_new(KEY_RSA1); | |
330 | bits = buffer_get_int(&auth->identities); | |
331 | buffer_get_bignum(&auth->identities, key->rsa->e); | |
332 | buffer_get_bignum(&auth->identities, key->rsa->n); | |
333 | *comment = buffer_get_string(&auth->identities, NULL); | |
334 | keybits = BN_num_bits(key->rsa->n); | |
335 | if (keybits < 0 || bits != (u_int)keybits) | |
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 | } | |
348 | /* Decrement the number of remaining entries. */ | |
349 | auth->howmany--; | |
350 | return key; | |
351 | } | |
352 | ||
353 | /* | |
354 | * Generates a random challenge, sends it to the agent, and waits for | |
355 | * response from the agent. Returns true (non-zero) if the agent gave the | |
356 | * correct answer, zero otherwise. Response type selects the style of | |
357 | * response desired, with 0 corresponding to protocol version 1.0 (no longer | |
358 | * supported) and 1 corresponding to protocol version 1.1. | |
359 | */ | |
360 | ||
361 | int | |
362 | ssh_decrypt_challenge(AuthenticationConnection *auth, | |
363 | Key* key, BIGNUM *challenge, | |
364 | u_char session_id[16], | |
365 | u_int response_type, | |
366 | u_char response[16]) | |
367 | { | |
368 | Buffer buffer; | |
369 | int success = 0; | |
370 | int i; | |
371 | int type; | |
372 | ||
373 | if (key->type != KEY_RSA1) | |
374 | return 0; | |
375 | if (response_type == 0) { | |
376 | logit("Compatibility with ssh protocol version 1.0 no longer supported."); | |
377 | return 0; | |
378 | } | |
379 | buffer_init(&buffer); | |
380 | buffer_put_char(&buffer, SSH_AGENTC_RSA_CHALLENGE); | |
381 | buffer_put_int(&buffer, BN_num_bits(key->rsa->n)); | |
382 | buffer_put_bignum(&buffer, key->rsa->e); | |
383 | buffer_put_bignum(&buffer, key->rsa->n); | |
384 | buffer_put_bignum(&buffer, challenge); | |
385 | buffer_append(&buffer, session_id, 16); | |
386 | buffer_put_int(&buffer, response_type); | |
387 | ||
388 | if (ssh_request_reply(auth, &buffer, &buffer) == 0) { | |
389 | buffer_free(&buffer); | |
390 | return 0; | |
391 | } | |
392 | type = buffer_get_char(&buffer); | |
393 | ||
394 | if (agent_failed(type)) { | |
395 | logit("Agent admitted failure to authenticate using the key."); | |
396 | } else if (type != SSH_AGENT_RSA_RESPONSE) { | |
397 | fatal("Bad authentication response: %d", type); | |
398 | } else { | |
399 | success = 1; | |
400 | /* | |
401 | * Get the response from the packet. This will abort with a | |
402 | * fatal error if the packet is corrupt. | |
403 | */ | |
404 | for (i = 0; i < 16; i++) | |
405 | response[i] = (u_char)buffer_get_char(&buffer); | |
406 | } | |
407 | buffer_free(&buffer); | |
408 | return success; | |
409 | } | |
410 | ||
411 | /* ask agent to sign data, returns -1 on error, 0 on success */ | |
412 | int | |
413 | ssh_agent_sign(AuthenticationConnection *auth, | |
414 | Key *key, | |
415 | u_char **sigp, u_int *lenp, | |
416 | u_char *data, u_int datalen) | |
417 | { | |
418 | extern int datafellows; | |
419 | Buffer msg; | |
420 | u_char *blob; | |
421 | u_int blen; | |
422 | int type, flags = 0; | |
423 | int ret = -1; | |
424 | ||
425 | if (key_to_blob(key, &blob, &blen) == 0) | |
426 | return -1; | |
427 | ||
428 | if (datafellows & SSH_BUG_SIGBLOB) | |
429 | flags = SSH_AGENT_OLD_SIGNATURE; | |
430 | ||
431 | buffer_init(&msg); | |
432 | buffer_put_char(&msg, SSH2_AGENTC_SIGN_REQUEST); | |
433 | buffer_put_string(&msg, blob, blen); | |
434 | buffer_put_string(&msg, data, datalen); | |
435 | buffer_put_int(&msg, flags); | |
436 | xfree(blob); | |
437 | ||
438 | if (ssh_request_reply(auth, &msg, &msg) == 0) { | |
439 | buffer_free(&msg); | |
440 | return -1; | |
441 | } | |
442 | type = buffer_get_char(&msg); | |
443 | if (agent_failed(type)) { | |
444 | logit("Agent admitted failure to sign using the key."); | |
445 | } else if (type != SSH2_AGENT_SIGN_RESPONSE) { | |
446 | fatal("Bad authentication response: %d", type); | |
447 | } else { | |
448 | ret = 0; | |
449 | *sigp = buffer_get_string(&msg, lenp); | |
450 | } | |
451 | buffer_free(&msg); | |
452 | return ret; | |
453 | } | |
454 | ||
455 | /* Encode key for a message to the agent. */ | |
456 | ||
457 | static void | |
458 | ssh_encode_identity_rsa1(Buffer *b, RSA *key, const char *comment) | |
459 | { | |
460 | buffer_put_int(b, BN_num_bits(key->n)); | |
461 | buffer_put_bignum(b, key->n); | |
462 | buffer_put_bignum(b, key->e); | |
463 | buffer_put_bignum(b, key->d); | |
464 | /* To keep within the protocol: p < q for ssh. in SSL p > q */ | |
465 | buffer_put_bignum(b, key->iqmp); /* ssh key->u */ | |
466 | buffer_put_bignum(b, key->q); /* ssh key->p, SSL key->q */ | |
467 | buffer_put_bignum(b, key->p); /* ssh key->q, SSL key->p */ | |
468 | buffer_put_cstring(b, comment); | |
469 | } | |
470 | ||
471 | static void | |
472 | ssh_encode_identity_ssh2(Buffer *b, Key *key, const char *comment) | |
473 | { | |
474 | buffer_put_cstring(b, key_ssh_name(key)); | |
475 | switch (key->type) { | |
476 | case KEY_RSA: | |
477 | buffer_put_bignum2(b, key->rsa->n); | |
478 | buffer_put_bignum2(b, key->rsa->e); | |
479 | buffer_put_bignum2(b, key->rsa->d); | |
480 | buffer_put_bignum2(b, key->rsa->iqmp); | |
481 | buffer_put_bignum2(b, key->rsa->p); | |
482 | buffer_put_bignum2(b, key->rsa->q); | |
483 | break; | |
484 | case KEY_DSA: | |
485 | buffer_put_bignum2(b, key->dsa->p); | |
486 | buffer_put_bignum2(b, key->dsa->q); | |
487 | buffer_put_bignum2(b, key->dsa->g); | |
488 | buffer_put_bignum2(b, key->dsa->pub_key); | |
489 | buffer_put_bignum2(b, key->dsa->priv_key); | |
490 | break; | |
491 | } | |
492 | buffer_put_cstring(b, comment); | |
493 | } | |
494 | ||
495 | /* | |
496 | * Adds an identity to the authentication server. This call is not meant to | |
497 | * be used by normal applications. | |
498 | */ | |
499 | ||
500 | int | |
501 | ssh_add_identity_constrained(AuthenticationConnection *auth, Key *key, | |
502 | const char *comment, u_int life, u_int confirm) | |
503 | { | |
504 | Buffer msg; | |
505 | int type, constrained = (life || confirm); | |
506 | ||
507 | buffer_init(&msg); | |
508 | ||
509 | switch (key->type) { | |
510 | case KEY_RSA1: | |
511 | type = constrained ? | |
512 | SSH_AGENTC_ADD_RSA_ID_CONSTRAINED : | |
513 | SSH_AGENTC_ADD_RSA_IDENTITY; | |
514 | buffer_put_char(&msg, type); | |
515 | ssh_encode_identity_rsa1(&msg, key->rsa, comment); | |
516 | break; | |
517 | case KEY_RSA: | |
518 | case KEY_DSA: | |
519 | type = constrained ? | |
520 | SSH2_AGENTC_ADD_ID_CONSTRAINED : | |
521 | SSH2_AGENTC_ADD_IDENTITY; | |
522 | buffer_put_char(&msg, type); | |
523 | ssh_encode_identity_ssh2(&msg, key, comment); | |
524 | break; | |
525 | default: | |
526 | buffer_free(&msg); | |
527 | return 0; | |
528 | } | |
529 | if (constrained) { | |
530 | if (life != 0) { | |
531 | buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME); | |
532 | buffer_put_int(&msg, life); | |
533 | } | |
534 | if (confirm != 0) | |
535 | buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_CONFIRM); | |
536 | } | |
537 | if (ssh_request_reply(auth, &msg, &msg) == 0) { | |
538 | buffer_free(&msg); | |
539 | return 0; | |
540 | } | |
541 | type = buffer_get_char(&msg); | |
542 | buffer_free(&msg); | |
543 | return decode_reply(type); | |
544 | } | |
545 | ||
546 | int | |
547 | ssh_add_identity(AuthenticationConnection *auth, Key *key, const char *comment) | |
548 | { | |
549 | return ssh_add_identity_constrained(auth, key, comment, 0, 0); | |
550 | } | |
551 | ||
552 | /* | |
553 | * Removes an identity from the authentication server. This call is not | |
554 | * meant to be used by normal applications. | |
555 | */ | |
556 | ||
557 | int | |
558 | ssh_remove_identity(AuthenticationConnection *auth, Key *key) | |
559 | { | |
560 | Buffer msg; | |
561 | int type; | |
562 | u_char *blob; | |
563 | u_int blen; | |
564 | ||
565 | buffer_init(&msg); | |
566 | ||
567 | if (key->type == KEY_RSA1) { | |
568 | buffer_put_char(&msg, SSH_AGENTC_REMOVE_RSA_IDENTITY); | |
569 | buffer_put_int(&msg, BN_num_bits(key->rsa->n)); | |
570 | buffer_put_bignum(&msg, key->rsa->e); | |
571 | buffer_put_bignum(&msg, key->rsa->n); | |
572 | } else if (key->type == KEY_DSA || key->type == KEY_RSA) { | |
573 | key_to_blob(key, &blob, &blen); | |
574 | buffer_put_char(&msg, SSH2_AGENTC_REMOVE_IDENTITY); | |
575 | buffer_put_string(&msg, blob, blen); | |
576 | xfree(blob); | |
577 | } else { | |
578 | buffer_free(&msg); | |
579 | return 0; | |
580 | } | |
581 | if (ssh_request_reply(auth, &msg, &msg) == 0) { | |
582 | buffer_free(&msg); | |
583 | return 0; | |
584 | } | |
585 | type = buffer_get_char(&msg); | |
586 | buffer_free(&msg); | |
587 | return decode_reply(type); | |
588 | } | |
589 | ||
590 | int | |
591 | ssh_update_card(AuthenticationConnection *auth, int add, | |
592 | const char *reader_id, const char *pin, u_int life, u_int confirm) | |
593 | { | |
594 | Buffer msg; | |
595 | int type, constrained = (life || confirm); | |
596 | ||
597 | if (add) { | |
598 | type = constrained ? | |
599 | SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED : | |
600 | SSH_AGENTC_ADD_SMARTCARD_KEY; | |
601 | } else | |
602 | type = SSH_AGENTC_REMOVE_SMARTCARD_KEY; | |
603 | ||
604 | buffer_init(&msg); | |
605 | buffer_put_char(&msg, type); | |
606 | buffer_put_cstring(&msg, reader_id); | |
607 | buffer_put_cstring(&msg, pin); | |
608 | ||
609 | if (constrained) { | |
610 | if (life != 0) { | |
611 | buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME); | |
612 | buffer_put_int(&msg, life); | |
613 | } | |
614 | if (confirm != 0) | |
615 | buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_CONFIRM); | |
616 | } | |
617 | ||
618 | if (ssh_request_reply(auth, &msg, &msg) == 0) { | |
619 | buffer_free(&msg); | |
620 | return 0; | |
621 | } | |
622 | type = buffer_get_char(&msg); | |
623 | buffer_free(&msg); | |
624 | return decode_reply(type); | |
625 | } | |
626 | ||
627 | /* | |
628 | * Removes all identities from the agent. This call is not meant to be used | |
629 | * by normal applications. | |
630 | */ | |
631 | ||
632 | int | |
633 | ssh_remove_all_identities(AuthenticationConnection *auth, int version) | |
634 | { | |
635 | Buffer msg; | |
636 | int type; | |
637 | int code = (version==1) ? | |
638 | SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES : | |
639 | SSH2_AGENTC_REMOVE_ALL_IDENTITIES; | |
640 | ||
641 | buffer_init(&msg); | |
642 | buffer_put_char(&msg, code); | |
643 | ||
644 | if (ssh_request_reply(auth, &msg, &msg) == 0) { | |
645 | buffer_free(&msg); | |
646 | return 0; | |
647 | } | |
648 | type = buffer_get_char(&msg); | |
649 | buffer_free(&msg); | |
650 | return decode_reply(type); | |
651 | } | |
652 | ||
653 | int | |
654 | decode_reply(int type) | |
655 | { | |
656 | switch (type) { | |
657 | case SSH_AGENT_FAILURE: | |
658 | case SSH_COM_AGENT2_FAILURE: | |
659 | case SSH2_AGENT_FAILURE: | |
660 | logit("SSH_AGENT_FAILURE"); | |
661 | return 0; | |
662 | case SSH_AGENT_SUCCESS: | |
663 | return 1; | |
664 | default: | |
665 | fatal("Bad response from authentication agent: %d", type); | |
666 | } | |
667 | /* NOTREACHED */ | |
668 | return 0; | |
669 | } |