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2e437378 | 1 | /* $OpenBSD: authfd.c,v 1.80 2006/08/03 03:34:41 deraadt Exp $ */ |
3c0ef626 | 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" | |
2e437378 | 39 | |
40 | #include <sys/types.h> | |
41 | #include <sys/un.h> | |
42 | #include <sys/socket.h> | |
3c0ef626 | 43 | |
44 | #include <openssl/evp.h> | |
45 | ||
2e437378 | 46 | #include <openssl/crypto.h> |
47 | #include <fcntl.h> | |
48 | #include <stdlib.h> | |
49 | #include <signal.h> | |
50 | #include <stdarg.h> | |
51 | #include <string.h> | |
52 | #include <unistd.h> | |
53 | ||
54 | #include "xmalloc.h" | |
3c0ef626 | 55 | #include "ssh.h" |
56 | #include "rsa.h" | |
57 | #include "buffer.h" | |
3c0ef626 | 58 | #include "key.h" |
59 | #include "authfd.h" | |
60 | #include "cipher.h" | |
61 | #include "kex.h" | |
62 | #include "compat.h" | |
63 | #include "log.h" | |
64 | #include "atomicio.h" | |
2e437378 | 65 | #include "misc.h" |
3c0ef626 | 66 | |
e54b3d7c | 67 | static int agent_present = 0; |
68 | ||
3c0ef626 | 69 | /* helper */ |
70 | int decode_reply(int type); | |
71 | ||
72 | /* macro to check for "agent failure" message */ | |
73 | #define agent_failed(x) \ | |
74 | ((x == SSH_AGENT_FAILURE) || (x == SSH_COM_AGENT2_FAILURE) || \ | |
ff2d7a98 | 75 | (x == SSH2_AGENT_FAILURE)) |
3c0ef626 | 76 | |
e54b3d7c | 77 | int |
78 | ssh_agent_present(void) | |
79 | { | |
80 | int authfd; | |
81 | ||
82 | if (agent_present) | |
83 | return 1; | |
84 | if ((authfd = ssh_get_authentication_socket()) == -1) | |
85 | return 0; | |
86 | else { | |
87 | ssh_close_authentication_socket(authfd); | |
88 | return 1; | |
89 | } | |
90 | } | |
91 | ||
3c0ef626 | 92 | /* Returns the number of the authentication fd, or -1 if there is none. */ |
93 | ||
94 | int | |
95 | ssh_get_authentication_socket(void) | |
96 | { | |
97 | const char *authsocket; | |
98 | int sock; | |
99 | struct sockaddr_un sunaddr; | |
100 | ||
101 | authsocket = getenv(SSH_AUTHSOCKET_ENV_NAME); | |
102 | if (!authsocket) | |
103 | return -1; | |
104 | ||
105 | sunaddr.sun_family = AF_UNIX; | |
106 | strlcpy(sunaddr.sun_path, authsocket, sizeof(sunaddr.sun_path)); | |
107 | ||
108 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
109 | if (sock < 0) | |
110 | return -1; | |
111 | ||
112 | /* close on exec */ | |
113 | if (fcntl(sock, F_SETFD, 1) == -1) { | |
114 | close(sock); | |
115 | return -1; | |
116 | } | |
2e437378 | 117 | if (connect(sock, (struct sockaddr *)&sunaddr, sizeof sunaddr) < 0) { |
3c0ef626 | 118 | close(sock); |
119 | return -1; | |
120 | } | |
e54b3d7c | 121 | agent_present = 1; |
3c0ef626 | 122 | return sock; |
123 | } | |
124 | ||
125 | static int | |
126 | ssh_request_reply(AuthenticationConnection *auth, Buffer *request, Buffer *reply) | |
127 | { | |
34fee935 | 128 | u_int l, len; |
3c0ef626 | 129 | char buf[1024]; |
130 | ||
131 | /* Get the length of the message, and format it in the buffer. */ | |
132 | len = buffer_len(request); | |
2e437378 | 133 | put_u32(buf, len); |
3c0ef626 | 134 | |
135 | /* Send the length and then the packet to the agent. */ | |
70791e56 | 136 | if (atomicio(vwrite, auth->fd, buf, 4) != 4 || |
137 | atomicio(vwrite, auth->fd, buffer_ptr(request), | |
3c0ef626 | 138 | buffer_len(request)) != buffer_len(request)) { |
139 | error("Error writing to authentication socket."); | |
140 | return 0; | |
141 | } | |
142 | /* | |
143 | * Wait for response from the agent. First read the length of the | |
144 | * response packet. | |
145 | */ | |
1b56ff3d | 146 | if (atomicio(read, auth->fd, buf, 4) != 4) { |
147 | error("Error reading response length from authentication socket."); | |
148 | return 0; | |
3c0ef626 | 149 | } |
150 | ||
151 | /* Extract the length, and check it for sanity. */ | |
2e437378 | 152 | len = get_u32(buf); |
3c0ef626 | 153 | if (len > 256 * 1024) |
416fd2a8 | 154 | fatal("Authentication response too long: %u", len); |
3c0ef626 | 155 | |
156 | /* Read the rest of the response in to the buffer. */ | |
157 | buffer_clear(reply); | |
158 | while (len > 0) { | |
159 | l = len; | |
160 | if (l > sizeof(buf)) | |
161 | l = sizeof(buf); | |
34fee935 | 162 | if (atomicio(read, auth->fd, buf, l) != l) { |
3c0ef626 | 163 | error("Error reading response from authentication socket."); |
164 | return 0; | |
165 | } | |
ff2d7a98 | 166 | buffer_append(reply, buf, l); |
3c0ef626 | 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 | ||
ff2d7a98 | 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 | ||
3c0ef626 | 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 | ||
e9a17296 | 259 | switch (version) { |
3c0ef626 | 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); | |
416fd2a8 | 296 | if ((u_int)auth->howmany > 1024) |
3c0ef626 | 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 | { | |
34fee935 | 315 | int keybits; |
3c0ef626 | 316 | u_int bits; |
317 | u_char *blob; | |
318 | u_int blen; | |
319 | Key *key = NULL; | |
320 | ||
321 | /* Return failure if no more entries. */ | |
322 | if (auth->howmany <= 0) | |
323 | return NULL; | |
324 | ||
325 | /* | |
326 | * Get the next entry from the packet. These will abort with a fatal | |
327 | * error if the packet is too short or contains corrupt data. | |
328 | */ | |
e9a17296 | 329 | switch (version) { |
3c0ef626 | 330 | case 1: |
331 | key = key_new(KEY_RSA1); | |
332 | bits = buffer_get_int(&auth->identities); | |
333 | buffer_get_bignum(&auth->identities, key->rsa->e); | |
334 | buffer_get_bignum(&auth->identities, key->rsa->n); | |
335 | *comment = buffer_get_string(&auth->identities, NULL); | |
34fee935 | 336 | keybits = BN_num_bits(key->rsa->n); |
337 | if (keybits < 0 || bits != (u_int)keybits) | |
70791e56 | 338 | logit("Warning: identity keysize mismatch: actual %d, announced %u", |
3c0ef626 | 339 | BN_num_bits(key->rsa->n), bits); |
340 | break; | |
341 | case 2: | |
342 | blob = buffer_get_string(&auth->identities, &blen); | |
343 | *comment = buffer_get_string(&auth->identities, NULL); | |
344 | key = key_from_blob(blob, blen); | |
345 | xfree(blob); | |
346 | break; | |
347 | default: | |
348 | return NULL; | |
3c0ef626 | 349 | } |
350 | /* Decrement the number of remaining entries. */ | |
351 | auth->howmany--; | |
352 | return key; | |
353 | } | |
354 | ||
355 | /* | |
356 | * Generates a random challenge, sends it to the agent, and waits for | |
357 | * response from the agent. Returns true (non-zero) if the agent gave the | |
358 | * correct answer, zero otherwise. Response type selects the style of | |
359 | * response desired, with 0 corresponding to protocol version 1.0 (no longer | |
360 | * supported) and 1 corresponding to protocol version 1.1. | |
361 | */ | |
362 | ||
363 | int | |
364 | ssh_decrypt_challenge(AuthenticationConnection *auth, | |
365 | Key* key, BIGNUM *challenge, | |
366 | u_char session_id[16], | |
367 | u_int response_type, | |
368 | u_char response[16]) | |
369 | { | |
370 | Buffer buffer; | |
371 | int success = 0; | |
372 | int i; | |
373 | int type; | |
374 | ||
375 | if (key->type != KEY_RSA1) | |
376 | return 0; | |
377 | if (response_type == 0) { | |
70791e56 | 378 | logit("Compatibility with ssh protocol version 1.0 no longer supported."); |
3c0ef626 | 379 | return 0; |
380 | } | |
381 | buffer_init(&buffer); | |
382 | buffer_put_char(&buffer, SSH_AGENTC_RSA_CHALLENGE); | |
383 | buffer_put_int(&buffer, BN_num_bits(key->rsa->n)); | |
384 | buffer_put_bignum(&buffer, key->rsa->e); | |
385 | buffer_put_bignum(&buffer, key->rsa->n); | |
386 | buffer_put_bignum(&buffer, challenge); | |
e9a17296 | 387 | buffer_append(&buffer, session_id, 16); |
3c0ef626 | 388 | buffer_put_int(&buffer, response_type); |
389 | ||
390 | if (ssh_request_reply(auth, &buffer, &buffer) == 0) { | |
391 | buffer_free(&buffer); | |
392 | return 0; | |
393 | } | |
394 | type = buffer_get_char(&buffer); | |
395 | ||
396 | if (agent_failed(type)) { | |
70791e56 | 397 | logit("Agent admitted failure to authenticate using the key."); |
3c0ef626 | 398 | } else if (type != SSH_AGENT_RSA_RESPONSE) { |
399 | fatal("Bad authentication response: %d", type); | |
400 | } else { | |
401 | success = 1; | |
402 | /* | |
403 | * Get the response from the packet. This will abort with a | |
404 | * fatal error if the packet is corrupt. | |
405 | */ | |
406 | for (i = 0; i < 16; i++) | |
2e437378 | 407 | response[i] = (u_char)buffer_get_char(&buffer); |
3c0ef626 | 408 | } |
409 | buffer_free(&buffer); | |
410 | return success; | |
411 | } | |
412 | ||
413 | /* ask agent to sign data, returns -1 on error, 0 on success */ | |
414 | int | |
415 | ssh_agent_sign(AuthenticationConnection *auth, | |
416 | Key *key, | |
e9a17296 | 417 | u_char **sigp, u_int *lenp, |
418 | u_char *data, u_int datalen) | |
3c0ef626 | 419 | { |
420 | extern int datafellows; | |
421 | Buffer msg; | |
422 | u_char *blob; | |
423 | u_int blen; | |
424 | int type, flags = 0; | |
425 | int ret = -1; | |
426 | ||
427 | if (key_to_blob(key, &blob, &blen) == 0) | |
428 | return -1; | |
429 | ||
430 | if (datafellows & SSH_BUG_SIGBLOB) | |
431 | flags = SSH_AGENT_OLD_SIGNATURE; | |
432 | ||
433 | buffer_init(&msg); | |
434 | buffer_put_char(&msg, SSH2_AGENTC_SIGN_REQUEST); | |
435 | buffer_put_string(&msg, blob, blen); | |
436 | buffer_put_string(&msg, data, datalen); | |
437 | buffer_put_int(&msg, flags); | |
438 | xfree(blob); | |
439 | ||
440 | if (ssh_request_reply(auth, &msg, &msg) == 0) { | |
441 | buffer_free(&msg); | |
442 | return -1; | |
443 | } | |
444 | type = buffer_get_char(&msg); | |
445 | if (agent_failed(type)) { | |
70791e56 | 446 | logit("Agent admitted failure to sign using the key."); |
3c0ef626 | 447 | } else if (type != SSH2_AGENT_SIGN_RESPONSE) { |
448 | fatal("Bad authentication response: %d", type); | |
449 | } else { | |
450 | ret = 0; | |
451 | *sigp = buffer_get_string(&msg, lenp); | |
452 | } | |
453 | buffer_free(&msg); | |
454 | return ret; | |
455 | } | |
456 | ||
457 | /* Encode key for a message to the agent. */ | |
458 | ||
459 | static void | |
460 | ssh_encode_identity_rsa1(Buffer *b, RSA *key, const char *comment) | |
461 | { | |
3c0ef626 | 462 | buffer_put_int(b, BN_num_bits(key->n)); |
463 | buffer_put_bignum(b, key->n); | |
464 | buffer_put_bignum(b, key->e); | |
465 | buffer_put_bignum(b, key->d); | |
466 | /* To keep within the protocol: p < q for ssh. in SSL p > q */ | |
467 | buffer_put_bignum(b, key->iqmp); /* ssh key->u */ | |
468 | buffer_put_bignum(b, key->q); /* ssh key->p, SSL key->q */ | |
469 | buffer_put_bignum(b, key->p); /* ssh key->q, SSL key->p */ | |
470 | buffer_put_cstring(b, comment); | |
471 | } | |
472 | ||
473 | static void | |
474 | ssh_encode_identity_ssh2(Buffer *b, Key *key, const char *comment) | |
475 | { | |
3c0ef626 | 476 | buffer_put_cstring(b, key_ssh_name(key)); |
e9a17296 | 477 | switch (key->type) { |
3c0ef626 | 478 | case KEY_RSA: |
479 | buffer_put_bignum2(b, key->rsa->n); | |
480 | buffer_put_bignum2(b, key->rsa->e); | |
481 | buffer_put_bignum2(b, key->rsa->d); | |
482 | buffer_put_bignum2(b, key->rsa->iqmp); | |
483 | buffer_put_bignum2(b, key->rsa->p); | |
484 | buffer_put_bignum2(b, key->rsa->q); | |
485 | break; | |
486 | case KEY_DSA: | |
487 | buffer_put_bignum2(b, key->dsa->p); | |
488 | buffer_put_bignum2(b, key->dsa->q); | |
489 | buffer_put_bignum2(b, key->dsa->g); | |
490 | buffer_put_bignum2(b, key->dsa->pub_key); | |
491 | buffer_put_bignum2(b, key->dsa->priv_key); | |
492 | break; | |
493 | } | |
494 | buffer_put_cstring(b, comment); | |
495 | } | |
496 | ||
497 | /* | |
498 | * Adds an identity to the authentication server. This call is not meant to | |
499 | * be used by normal applications. | |
500 | */ | |
501 | ||
502 | int | |
ff2d7a98 | 503 | ssh_add_identity_constrained(AuthenticationConnection *auth, Key *key, |
1c14df9e | 504 | const char *comment, u_int life, u_int confirm) |
3c0ef626 | 505 | { |
506 | Buffer msg; | |
1c14df9e | 507 | int type, constrained = (life || confirm); |
3c0ef626 | 508 | |
509 | buffer_init(&msg); | |
510 | ||
511 | switch (key->type) { | |
512 | case KEY_RSA1: | |
ff2d7a98 | 513 | type = constrained ? |
514 | SSH_AGENTC_ADD_RSA_ID_CONSTRAINED : | |
515 | SSH_AGENTC_ADD_RSA_IDENTITY; | |
516 | buffer_put_char(&msg, type); | |
3c0ef626 | 517 | ssh_encode_identity_rsa1(&msg, key->rsa, comment); |
518 | break; | |
519 | case KEY_RSA: | |
520 | case KEY_DSA: | |
ff2d7a98 | 521 | type = constrained ? |
522 | SSH2_AGENTC_ADD_ID_CONSTRAINED : | |
523 | SSH2_AGENTC_ADD_IDENTITY; | |
524 | buffer_put_char(&msg, type); | |
3c0ef626 | 525 | ssh_encode_identity_ssh2(&msg, key, comment); |
526 | break; | |
527 | default: | |
528 | buffer_free(&msg); | |
529 | return 0; | |
3c0ef626 | 530 | } |
ff2d7a98 | 531 | if (constrained) { |
532 | if (life != 0) { | |
533 | buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME); | |
534 | buffer_put_int(&msg, life); | |
535 | } | |
1c14df9e | 536 | if (confirm != 0) |
537 | buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_CONFIRM); | |
ff2d7a98 | 538 | } |
3c0ef626 | 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 | ||
ff2d7a98 | 548 | int |
549 | ssh_add_identity(AuthenticationConnection *auth, Key *key, const char *comment) | |
550 | { | |
1c14df9e | 551 | return ssh_add_identity_constrained(auth, key, comment, 0, 0); |
ff2d7a98 | 552 | } |
553 | ||
3c0ef626 | 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 | |
416fd2a8 | 593 | ssh_update_card(AuthenticationConnection *auth, int add, |
70791e56 | 594 | const char *reader_id, const char *pin, u_int life, u_int confirm) |
3c0ef626 | 595 | { |
596 | Buffer msg; | |
70791e56 | 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; | |
3c0ef626 | 605 | |
606 | buffer_init(&msg); | |
70791e56 | 607 | buffer_put_char(&msg, type); |
3c0ef626 | 608 | buffer_put_cstring(&msg, reader_id); |
2980ea68 | 609 | buffer_put_cstring(&msg, pin); |
416fd2a8 | 610 | |
70791e56 | 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 | ||
3c0ef626 | 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: | |
70791e56 | 662 | logit("SSH_AGENT_FAILURE"); |
3c0ef626 | 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 | } |