1 /* $OpenBSD: authfd.c,v 1.86 2011/07/06 18:09:21 tedu 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 <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"
55 #include "ssh.h"
56 #include "rsa.h"
57 #include "buffer.h"
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"
65 #include "misc.h"
66
67 static int agent_present = 0;
68
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) || \
75 (x == SSH2_AGENT_FAILURE))
76
77 int
ssh_agent_present(void)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
92 /* Returns the number of the authentication fd, or -1 if there is none. */
93
94 int
ssh_get_authentication_socket(void)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 bzero(&sunaddr, sizeof(sunaddr));
106 sunaddr.sun_family = AF_UNIX;
107 strlcpy(sunaddr.sun_path, authsocket, sizeof(sunaddr.sun_path));
108
109 sock = socket(AF_UNIX, SOCK_STREAM, 0);
110 if (sock < 0)
111 return -1;
112
113 /* close on exec */
114 if (fcntl(sock, F_SETFD, FD_CLOEXEC) == -1) {
115 close(sock);
116 return -1;
117 }
118 if (connect(sock, (struct sockaddr *)&sunaddr, sizeof sunaddr) < 0) {
119 close(sock);
120 return -1;
121 }
122 agent_present = 1;
123 return sock;
124 }
125
126 static int
ssh_request_reply(AuthenticationConnection * auth,Buffer * request,Buffer * reply)127 ssh_request_reply(AuthenticationConnection *auth, Buffer *request, Buffer *reply)
128 {
129 u_int l, len;
130 char buf[1024];
131
132 /* Get the length of the message, and format it in the buffer. */
133 len = buffer_len(request);
134 put_u32(buf, len);
135
136 /* Send the length and then the packet to the agent. */
137 if (atomicio(vwrite, auth->fd, buf, 4) != 4 ||
138 atomicio(vwrite, auth->fd, buffer_ptr(request),
139 buffer_len(request)) != buffer_len(request)) {
140 error("Error writing to authentication socket.");
141 return 0;
142 }
143 /*
144 * Wait for response from the agent. First read the length of the
145 * response packet.
146 */
147 if (atomicio(read, auth->fd, buf, 4) != 4) {
148 error("Error reading response length from authentication socket.");
149 return 0;
150 }
151
152 /* Extract the length, and check it for sanity. */
153 len = get_u32(buf);
154 if (len > 256 * 1024)
155 fatal("Authentication response too long: %u", len);
156
157 /* Read the rest of the response in to the buffer. */
158 buffer_clear(reply);
159 while (len > 0) {
160 l = len;
161 if (l > sizeof(buf))
162 l = sizeof(buf);
163 if (atomicio(read, auth->fd, buf, l) != l) {
164 error("Error reading response from authentication socket.");
165 return 0;
166 }
167 buffer_append(reply, buf, l);
168 len -= l;
169 }
170 return 1;
171 }
172
173 /*
174 * Closes the agent socket if it should be closed (depends on how it was
175 * obtained). The argument must have been returned by
176 * ssh_get_authentication_socket().
177 */
178
179 void
ssh_close_authentication_socket(int sock)180 ssh_close_authentication_socket(int sock)
181 {
182 if (getenv(SSH_AUTHSOCKET_ENV_NAME))
183 close(sock);
184 }
185
186 /*
187 * Opens and connects a private socket for communication with the
188 * authentication agent. Returns the file descriptor (which must be
189 * shut down and closed by the caller when no longer needed).
190 * Returns NULL if an error occurred and the connection could not be
191 * opened.
192 */
193
194 AuthenticationConnection *
ssh_get_authentication_connection(void)195 ssh_get_authentication_connection(void)
196 {
197 AuthenticationConnection *auth;
198 int sock;
199
200 sock = ssh_get_authentication_socket();
201
202 /*
203 * Fail if we couldn't obtain a connection. This happens if we
204 * exited due to a timeout.
205 */
206 if (sock < 0)
207 return NULL;
208
209 auth = xmalloc(sizeof(*auth));
210 auth->fd = sock;
211 buffer_init(&auth->identities);
212 auth->howmany = 0;
213
214 return auth;
215 }
216
217 /*
218 * Closes the connection to the authentication agent and frees any associated
219 * memory.
220 */
221
222 void
ssh_close_authentication_connection(AuthenticationConnection * auth)223 ssh_close_authentication_connection(AuthenticationConnection *auth)
224 {
225 buffer_free(&auth->identities);
226 close(auth->fd);
227 xfree(auth);
228 }
229
230 /* Lock/unlock agent */
231 int
ssh_lock_agent(AuthenticationConnection * auth,int lock,const char * password)232 ssh_lock_agent(AuthenticationConnection *auth, int lock, const char *password)
233 {
234 int type;
235 Buffer msg;
236
237 buffer_init(&msg);
238 buffer_put_char(&msg, lock ? SSH_AGENTC_LOCK : SSH_AGENTC_UNLOCK);
239 buffer_put_cstring(&msg, password);
240
241 if (ssh_request_reply(auth, &msg, &msg) == 0) {
242 buffer_free(&msg);
243 return 0;
244 }
245 type = buffer_get_char(&msg);
246 buffer_free(&msg);
247 return decode_reply(type);
248 }
249
250 /*
251 * Returns the first authentication identity held by the agent.
252 */
253
254 int
ssh_get_num_identities(AuthenticationConnection * auth,int version)255 ssh_get_num_identities(AuthenticationConnection *auth, int version)
256 {
257 int type, code1 = 0, code2 = 0;
258 Buffer request;
259
260 switch (version) {
261 case 1:
262 code1 = SSH_AGENTC_REQUEST_RSA_IDENTITIES;
263 code2 = SSH_AGENT_RSA_IDENTITIES_ANSWER;
264 break;
265 case 2:
266 code1 = SSH2_AGENTC_REQUEST_IDENTITIES;
267 code2 = SSH2_AGENT_IDENTITIES_ANSWER;
268 break;
269 default:
270 return 0;
271 }
272
273 /*
274 * Send a message to the agent requesting for a list of the
275 * identities it can represent.
276 */
277 buffer_init(&request);
278 buffer_put_char(&request, code1);
279
280 buffer_clear(&auth->identities);
281 if (ssh_request_reply(auth, &request, &auth->identities) == 0) {
282 buffer_free(&request);
283 return 0;
284 }
285 buffer_free(&request);
286
287 /* Get message type, and verify that we got a proper answer. */
288 type = buffer_get_char(&auth->identities);
289 if (agent_failed(type)) {
290 return 0;
291 } else if (type != code2) {
292 fatal("Bad authentication reply message type: %d", type);
293 }
294
295 /* Get the number of entries in the response and check it for sanity. */
296 auth->howmany = buffer_get_int(&auth->identities);
297 if ((u_int)auth->howmany > 1024)
298 fatal("Too many identities in authentication reply: %d",
299 auth->howmany);
300
301 return auth->howmany;
302 }
303
304 Key *
ssh_get_first_identity(AuthenticationConnection * auth,char ** comment,int version)305 ssh_get_first_identity(AuthenticationConnection *auth, char **comment, int version)
306 {
307 /* get number of identities and return the first entry (if any). */
308 if (ssh_get_num_identities(auth, version) > 0)
309 return ssh_get_next_identity(auth, comment, version);
310 return NULL;
311 }
312
313 Key *
ssh_get_next_identity(AuthenticationConnection * auth,char ** comment,int version)314 ssh_get_next_identity(AuthenticationConnection *auth, char **comment, int version)
315 {
316 int keybits;
317 u_int bits;
318 u_char *blob;
319 u_int blen;
320 Key *key = NULL;
321
322 /* Return failure if no more entries. */
323 if (auth->howmany <= 0)
324 return NULL;
325
326 /*
327 * Get the next entry from the packet. These will abort with a fatal
328 * error if the packet is too short or contains corrupt data.
329 */
330 switch (version) {
331 case 1:
332 key = key_new(KEY_RSA1);
333 bits = buffer_get_int(&auth->identities);
334 buffer_get_bignum(&auth->identities, key->rsa->e);
335 buffer_get_bignum(&auth->identities, key->rsa->n);
336 *comment = buffer_get_string(&auth->identities, NULL);
337 keybits = BN_num_bits(key->rsa->n);
338 if (keybits < 0 || bits != (u_int)keybits)
339 logit("Warning: identity keysize mismatch: actual %d, announced %u",
340 BN_num_bits(key->rsa->n), bits);
341 break;
342 case 2:
343 blob = buffer_get_string(&auth->identities, &blen);
344 *comment = buffer_get_string(&auth->identities, NULL);
345 key = key_from_blob(blob, blen);
346 xfree(blob);
347 break;
348 default:
349 return NULL;
350 }
351 /* Decrement the number of remaining entries. */
352 auth->howmany--;
353 return key;
354 }
355
356 /*
357 * Generates a random challenge, sends it to the agent, and waits for
358 * response from the agent. Returns true (non-zero) if the agent gave the
359 * correct answer, zero otherwise. Response type selects the style of
360 * response desired, with 0 corresponding to protocol version 1.0 (no longer
361 * supported) and 1 corresponding to protocol version 1.1.
362 */
363
364 int
ssh_decrypt_challenge(AuthenticationConnection * auth,Key * key,BIGNUM * challenge,u_char session_id[16],u_int response_type,u_char response[16])365 ssh_decrypt_challenge(AuthenticationConnection *auth,
366 Key* key, BIGNUM *challenge,
367 u_char session_id[16],
368 u_int response_type,
369 u_char response[16])
370 {
371 Buffer buffer;
372 int success = 0;
373 int i;
374 int type;
375
376 if (key->type != KEY_RSA1)
377 return 0;
378 if (response_type == 0) {
379 logit("Compatibility with ssh protocol version 1.0 no longer supported.");
380 return 0;
381 }
382 buffer_init(&buffer);
383 buffer_put_char(&buffer, SSH_AGENTC_RSA_CHALLENGE);
384 buffer_put_int(&buffer, BN_num_bits(key->rsa->n));
385 buffer_put_bignum(&buffer, key->rsa->e);
386 buffer_put_bignum(&buffer, key->rsa->n);
387 buffer_put_bignum(&buffer, challenge);
388 buffer_append(&buffer, session_id, 16);
389 buffer_put_int(&buffer, response_type);
390
391 if (ssh_request_reply(auth, &buffer, &buffer) == 0) {
392 buffer_free(&buffer);
393 return 0;
394 }
395 type = buffer_get_char(&buffer);
396
397 if (agent_failed(type)) {
398 logit("Agent admitted failure to authenticate using the key.");
399 } else if (type != SSH_AGENT_RSA_RESPONSE) {
400 fatal("Bad authentication response: %d", type);
401 } else {
402 success = 1;
403 /*
404 * Get the response from the packet. This will abort with a
405 * fatal error if the packet is corrupt.
406 */
407 for (i = 0; i < 16; i++)
408 response[i] = (u_char)buffer_get_char(&buffer);
409 }
410 buffer_free(&buffer);
411 return success;
412 }
413
414 /* ask agent to sign data, returns -1 on error, 0 on success */
415 int
ssh_agent_sign(AuthenticationConnection * auth,Key * key,u_char ** sigp,u_int * lenp,u_char * data,u_int datalen)416 ssh_agent_sign(AuthenticationConnection *auth,
417 Key *key,
418 u_char **sigp, u_int *lenp,
419 u_char *data, u_int datalen)
420 {
421 extern int datafellows;
422 Buffer msg;
423 u_char *blob;
424 u_int blen;
425 int type, flags = 0;
426 int ret = -1;
427
428 if (key_to_blob(key, &blob, &blen) == 0)
429 return -1;
430
431 if (datafellows & SSH_BUG_SIGBLOB)
432 flags = SSH_AGENT_OLD_SIGNATURE;
433
434 buffer_init(&msg);
435 buffer_put_char(&msg, SSH2_AGENTC_SIGN_REQUEST);
436 buffer_put_string(&msg, blob, blen);
437 buffer_put_string(&msg, data, datalen);
438 buffer_put_int(&msg, flags);
439 xfree(blob);
440
441 if (ssh_request_reply(auth, &msg, &msg) == 0) {
442 buffer_free(&msg);
443 return -1;
444 }
445 type = buffer_get_char(&msg);
446 if (agent_failed(type)) {
447 logit("Agent admitted failure to sign using the key.");
448 } else if (type != SSH2_AGENT_SIGN_RESPONSE) {
449 fatal("Bad authentication response: %d", type);
450 } else {
451 ret = 0;
452 *sigp = buffer_get_string(&msg, lenp);
453 }
454 buffer_free(&msg);
455 return ret;
456 }
457
458 /* Encode key for a message to the agent. */
459
460 static void
ssh_encode_identity_rsa1(Buffer * b,RSA * key,const char * comment)461 ssh_encode_identity_rsa1(Buffer *b, RSA *key, const char *comment)
462 {
463 buffer_put_int(b, BN_num_bits(key->n));
464 buffer_put_bignum(b, key->n);
465 buffer_put_bignum(b, key->e);
466 buffer_put_bignum(b, key->d);
467 /* To keep within the protocol: p < q for ssh. in SSL p > q */
468 buffer_put_bignum(b, key->iqmp); /* ssh key->u */
469 buffer_put_bignum(b, key->q); /* ssh key->p, SSL key->q */
470 buffer_put_bignum(b, key->p); /* ssh key->q, SSL key->p */
471 buffer_put_cstring(b, comment);
472 }
473
474 static void
ssh_encode_identity_ssh2(Buffer * b,Key * key,const char * comment)475 ssh_encode_identity_ssh2(Buffer *b, Key *key, const char *comment)
476 {
477 buffer_put_cstring(b, key_ssh_name(key));
478 switch (key->type) {
479 case KEY_RSA:
480 buffer_put_bignum2(b, key->rsa->n);
481 buffer_put_bignum2(b, key->rsa->e);
482 buffer_put_bignum2(b, key->rsa->d);
483 buffer_put_bignum2(b, key->rsa->iqmp);
484 buffer_put_bignum2(b, key->rsa->p);
485 buffer_put_bignum2(b, key->rsa->q);
486 break;
487 case KEY_RSA_CERT_V00:
488 case KEY_RSA_CERT:
489 if (key->cert == NULL || buffer_len(&key->cert->certblob) == 0)
490 fatal("%s: no cert/certblob", __func__);
491 buffer_put_string(b, buffer_ptr(&key->cert->certblob),
492 buffer_len(&key->cert->certblob));
493 buffer_put_bignum2(b, key->rsa->d);
494 buffer_put_bignum2(b, key->rsa->iqmp);
495 buffer_put_bignum2(b, key->rsa->p);
496 buffer_put_bignum2(b, key->rsa->q);
497 break;
498 case KEY_DSA:
499 buffer_put_bignum2(b, key->dsa->p);
500 buffer_put_bignum2(b, key->dsa->q);
501 buffer_put_bignum2(b, key->dsa->g);
502 buffer_put_bignum2(b, key->dsa->pub_key);
503 buffer_put_bignum2(b, key->dsa->priv_key);
504 break;
505 case KEY_DSA_CERT_V00:
506 case KEY_DSA_CERT:
507 if (key->cert == NULL || buffer_len(&key->cert->certblob) == 0)
508 fatal("%s: no cert/certblob", __func__);
509 buffer_put_string(b, buffer_ptr(&key->cert->certblob),
510 buffer_len(&key->cert->certblob));
511 buffer_put_bignum2(b, key->dsa->priv_key);
512 break;
513 #ifdef OPENSSL_HAS_ECC
514 case KEY_ECDSA:
515 buffer_put_cstring(b, key_curve_nid_to_name(key->ecdsa_nid));
516 buffer_put_ecpoint(b, EC_KEY_get0_group(key->ecdsa),
517 EC_KEY_get0_public_key(key->ecdsa));
518 buffer_put_bignum2(b, EC_KEY_get0_private_key(key->ecdsa));
519 break;
520 case KEY_ECDSA_CERT:
521 if (key->cert == NULL || buffer_len(&key->cert->certblob) == 0)
522 fatal("%s: no cert/certblob", __func__);
523 buffer_put_string(b, buffer_ptr(&key->cert->certblob),
524 buffer_len(&key->cert->certblob));
525 buffer_put_bignum2(b, EC_KEY_get0_private_key(key->ecdsa));
526 break;
527 #endif
528 }
529 buffer_put_cstring(b, comment);
530 }
531
532 /*
533 * Adds an identity to the authentication server. This call is not meant to
534 * be used by normal applications.
535 */
536
537 int
ssh_add_identity_constrained(AuthenticationConnection * auth,Key * key,const char * comment,u_int life,u_int confirm)538 ssh_add_identity_constrained(AuthenticationConnection *auth, Key *key,
539 const char *comment, u_int life, u_int confirm)
540 {
541 Buffer msg;
542 int type, constrained = (life || confirm);
543
544 buffer_init(&msg);
545
546 switch (key->type) {
547 case KEY_RSA1:
548 type = constrained ?
549 SSH_AGENTC_ADD_RSA_ID_CONSTRAINED :
550 SSH_AGENTC_ADD_RSA_IDENTITY;
551 buffer_put_char(&msg, type);
552 ssh_encode_identity_rsa1(&msg, key->rsa, comment);
553 break;
554 case KEY_RSA:
555 case KEY_RSA_CERT:
556 case KEY_RSA_CERT_V00:
557 case KEY_DSA:
558 case KEY_DSA_CERT:
559 case KEY_DSA_CERT_V00:
560 case KEY_ECDSA:
561 case KEY_ECDSA_CERT:
562 type = constrained ?
563 SSH2_AGENTC_ADD_ID_CONSTRAINED :
564 SSH2_AGENTC_ADD_IDENTITY;
565 buffer_put_char(&msg, type);
566 ssh_encode_identity_ssh2(&msg, key, comment);
567 break;
568 default:
569 buffer_free(&msg);
570 return 0;
571 }
572 if (constrained) {
573 if (life != 0) {
574 buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME);
575 buffer_put_int(&msg, life);
576 }
577 if (confirm != 0)
578 buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_CONFIRM);
579 }
580 if (ssh_request_reply(auth, &msg, &msg) == 0) {
581 buffer_free(&msg);
582 return 0;
583 }
584 type = buffer_get_char(&msg);
585 buffer_free(&msg);
586 return decode_reply(type);
587 }
588
589 /*
590 * Removes an identity from the authentication server. This call is not
591 * meant to be used by normal applications.
592 */
593
594 int
ssh_remove_identity(AuthenticationConnection * auth,Key * key)595 ssh_remove_identity(AuthenticationConnection *auth, Key *key)
596 {
597 Buffer msg;
598 int type;
599 u_char *blob;
600 u_int blen;
601
602 buffer_init(&msg);
603
604 if (key->type == KEY_RSA1) {
605 buffer_put_char(&msg, SSH_AGENTC_REMOVE_RSA_IDENTITY);
606 buffer_put_int(&msg, BN_num_bits(key->rsa->n));
607 buffer_put_bignum(&msg, key->rsa->e);
608 buffer_put_bignum(&msg, key->rsa->n);
609 } else if (key_type_plain(key->type) == KEY_DSA ||
610 key_type_plain(key->type) == KEY_RSA ||
611 key_type_plain(key->type) == KEY_ECDSA) {
612 key_to_blob(key, &blob, &blen);
613 buffer_put_char(&msg, SSH2_AGENTC_REMOVE_IDENTITY);
614 buffer_put_string(&msg, blob, blen);
615 xfree(blob);
616 } else {
617 buffer_free(&msg);
618 return 0;
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 int
ssh_update_card(AuthenticationConnection * auth,int add,const char * reader_id,const char * pin,u_int life,u_int confirm)630 ssh_update_card(AuthenticationConnection *auth, int add,
631 const char *reader_id, const char *pin, u_int life, u_int confirm)
632 {
633 Buffer msg;
634 int type, constrained = (life || confirm);
635
636 if (add) {
637 type = constrained ?
638 SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED :
639 SSH_AGENTC_ADD_SMARTCARD_KEY;
640 } else
641 type = SSH_AGENTC_REMOVE_SMARTCARD_KEY;
642
643 buffer_init(&msg);
644 buffer_put_char(&msg, type);
645 buffer_put_cstring(&msg, reader_id);
646 buffer_put_cstring(&msg, pin);
647
648 if (constrained) {
649 if (life != 0) {
650 buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME);
651 buffer_put_int(&msg, life);
652 }
653 if (confirm != 0)
654 buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_CONFIRM);
655 }
656
657 if (ssh_request_reply(auth, &msg, &msg) == 0) {
658 buffer_free(&msg);
659 return 0;
660 }
661 type = buffer_get_char(&msg);
662 buffer_free(&msg);
663 return decode_reply(type);
664 }
665
666 /*
667 * Removes all identities from the agent. This call is not meant to be used
668 * by normal applications.
669 */
670
671 int
ssh_remove_all_identities(AuthenticationConnection * auth,int version)672 ssh_remove_all_identities(AuthenticationConnection *auth, int version)
673 {
674 Buffer msg;
675 int type;
676 int code = (version==1) ?
677 SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES :
678 SSH2_AGENTC_REMOVE_ALL_IDENTITIES;
679
680 buffer_init(&msg);
681 buffer_put_char(&msg, code);
682
683 if (ssh_request_reply(auth, &msg, &msg) == 0) {
684 buffer_free(&msg);
685 return 0;
686 }
687 type = buffer_get_char(&msg);
688 buffer_free(&msg);
689 return decode_reply(type);
690 }
691
692 int
decode_reply(int type)693 decode_reply(int type)
694 {
695 switch (type) {
696 case SSH_AGENT_FAILURE:
697 case SSH_COM_AGENT2_FAILURE:
698 case SSH2_AGENT_FAILURE:
699 logit("SSH_AGENT_FAILURE");
700 return 0;
701 case SSH_AGENT_SUCCESS:
702 return 1;
703 default:
704 fatal("Bad response from authentication agent: %d", type);
705 }
706 /* NOTREACHED */
707 return 0;
708 }
709