1 /* $OpenBSD: authfd.c,v 1.100 2015/12/04 16:41:28 markus 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 39 #include <sys/types.h> 40 #include <sys/un.h> 41 #include <sys/socket.h> 42 43 #include <fcntl.h> 44 #include <stdlib.h> 45 #include <signal.h> 46 #include <string.h> 47 #include <unistd.h> 48 #include <errno.h> 49 50 #include "xmalloc.h" 51 #include "ssh.h" 52 #include "rsa.h" 53 #include "sshbuf.h" 54 #include "sshkey.h" 55 #include "authfd.h" 56 #include "cipher.h" 57 #include "compat.h" 58 #include "log.h" 59 #include "atomicio.h" 60 #include "misc.h" 61 #include "ssherr.h" 62 63 #define MAX_AGENT_IDENTITIES 2048 /* Max keys in agent reply */ 64 #define MAX_AGENT_REPLY_LEN (256 * 1024) /* Max bytes in agent reply */ 65 66 /* macro to check for "agent failure" message */ 67 #define agent_failed(x) \ 68 ((x == SSH_AGENT_FAILURE) || \ 69 (x == SSH_COM_AGENT2_FAILURE) || \ 70 (x == SSH2_AGENT_FAILURE)) 71 72 /* Convert success/failure response from agent to a err.h status */ 73 static int 74 decode_reply(u_char type) 75 { 76 if (agent_failed(type)) 77 return SSH_ERR_AGENT_FAILURE; 78 else if (type == SSH_AGENT_SUCCESS) 79 return 0; 80 else 81 return SSH_ERR_INVALID_FORMAT; 82 } 83 84 /* Returns the number of the authentication fd, or -1 if there is none. */ 85 int 86 ssh_get_authentication_socket(int *fdp) 87 { 88 const char *authsocket; 89 int sock, oerrno; 90 struct sockaddr_un sunaddr; 91 92 if (fdp != NULL) 93 *fdp = -1; 94 95 authsocket = getenv(SSH_AUTHSOCKET_ENV_NAME); 96 if (!authsocket) 97 return SSH_ERR_AGENT_NOT_PRESENT; 98 99 memset(&sunaddr, 0, sizeof(sunaddr)); 100 sunaddr.sun_family = AF_UNIX; 101 strlcpy(sunaddr.sun_path, authsocket, sizeof(sunaddr.sun_path)); 102 103 if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) 104 return SSH_ERR_SYSTEM_ERROR; 105 106 /* close on exec */ 107 if (fcntl(sock, F_SETFD, FD_CLOEXEC) == -1 || 108 connect(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) { 109 oerrno = errno; 110 close(sock); 111 errno = oerrno; 112 return SSH_ERR_SYSTEM_ERROR; 113 } 114 if (fdp != NULL) 115 *fdp = sock; 116 else 117 close(sock); 118 return 0; 119 } 120 121 /* Communicate with agent: send request and read reply */ 122 static int 123 ssh_request_reply(int sock, struct sshbuf *request, struct sshbuf *reply) 124 { 125 int r; 126 size_t l, len; 127 char buf[1024]; 128 129 /* Get the length of the message, and format it in the buffer. */ 130 len = sshbuf_len(request); 131 put_u32(buf, len); 132 133 /* Send the length and then the packet to the agent. */ 134 if (atomicio(vwrite, sock, buf, 4) != 4 || 135 atomicio(vwrite, sock, (u_char *)sshbuf_ptr(request), 136 sshbuf_len(request)) != sshbuf_len(request)) 137 return SSH_ERR_AGENT_COMMUNICATION; 138 /* 139 * Wait for response from the agent. First read the length of the 140 * response packet. 141 */ 142 if (atomicio(read, sock, buf, 4) != 4) 143 return SSH_ERR_AGENT_COMMUNICATION; 144 145 /* Extract the length, and check it for sanity. */ 146 len = get_u32(buf); 147 if (len > MAX_AGENT_REPLY_LEN) 148 return SSH_ERR_INVALID_FORMAT; 149 150 /* Read the rest of the response in to the buffer. */ 151 sshbuf_reset(reply); 152 while (len > 0) { 153 l = len; 154 if (l > sizeof(buf)) 155 l = sizeof(buf); 156 if (atomicio(read, sock, buf, l) != l) 157 return SSH_ERR_AGENT_COMMUNICATION; 158 if ((r = sshbuf_put(reply, buf, l)) != 0) 159 return r; 160 len -= l; 161 } 162 return 0; 163 } 164 165 /* 166 * Closes the agent socket if it should be closed (depends on how it was 167 * obtained). The argument must have been returned by 168 * ssh_get_authentication_socket(). 169 */ 170 void 171 ssh_close_authentication_socket(int sock) 172 { 173 if (getenv(SSH_AUTHSOCKET_ENV_NAME)) 174 close(sock); 175 } 176 177 /* Lock/unlock agent */ 178 int 179 ssh_lock_agent(int sock, int lock, const char *password) 180 { 181 int r; 182 u_char type = lock ? SSH_AGENTC_LOCK : SSH_AGENTC_UNLOCK; 183 struct sshbuf *msg; 184 185 if ((msg = sshbuf_new()) == NULL) 186 return SSH_ERR_ALLOC_FAIL; 187 if ((r = sshbuf_put_u8(msg, type)) != 0 || 188 (r = sshbuf_put_cstring(msg, password)) != 0) 189 goto out; 190 if ((r = ssh_request_reply(sock, msg, msg)) != 0) 191 goto out; 192 if ((r = sshbuf_get_u8(msg, &type)) != 0) 193 goto out; 194 r = decode_reply(type); 195 out: 196 sshbuf_free(msg); 197 return r; 198 } 199 200 #ifdef WITH_SSH1 201 static int 202 deserialise_identity1(struct sshbuf *ids, struct sshkey **keyp, char **commentp) 203 { 204 struct sshkey *key; 205 int r, keybits; 206 u_int32_t bits; 207 char *comment = NULL; 208 209 if ((key = sshkey_new(KEY_RSA1)) == NULL) 210 return SSH_ERR_ALLOC_FAIL; 211 if ((r = sshbuf_get_u32(ids, &bits)) != 0 || 212 (r = sshbuf_get_bignum1(ids, key->rsa->e)) != 0 || 213 (r = sshbuf_get_bignum1(ids, key->rsa->n)) != 0 || 214 (r = sshbuf_get_cstring(ids, &comment, NULL)) != 0) 215 goto out; 216 keybits = BN_num_bits(key->rsa->n); 217 /* XXX previously we just warned here. I think we should be strict */ 218 if (keybits < 0 || bits != (u_int)keybits) { 219 r = SSH_ERR_KEY_BITS_MISMATCH; 220 goto out; 221 } 222 if (keyp != NULL) { 223 *keyp = key; 224 key = NULL; 225 } 226 if (commentp != NULL) { 227 *commentp = comment; 228 comment = NULL; 229 } 230 r = 0; 231 out: 232 sshkey_free(key); 233 free(comment); 234 return r; 235 } 236 #endif 237 238 static int 239 deserialise_identity2(struct sshbuf *ids, struct sshkey **keyp, char **commentp) 240 { 241 int r; 242 char *comment = NULL; 243 const u_char *blob; 244 size_t blen; 245 246 if ((r = sshbuf_get_string_direct(ids, &blob, &blen)) != 0 || 247 (r = sshbuf_get_cstring(ids, &comment, NULL)) != 0) 248 goto out; 249 if ((r = sshkey_from_blob(blob, blen, keyp)) != 0) 250 goto out; 251 if (commentp != NULL) { 252 *commentp = comment; 253 comment = NULL; 254 } 255 r = 0; 256 out: 257 free(comment); 258 return r; 259 } 260 261 /* 262 * Fetch list of identities held by the agent. 263 */ 264 int 265 ssh_fetch_identitylist(int sock, int version, struct ssh_identitylist **idlp) 266 { 267 u_char type, code1 = 0, code2 = 0; 268 u_int32_t num, i; 269 struct sshbuf *msg; 270 struct ssh_identitylist *idl = NULL; 271 int r; 272 273 /* Determine request and expected response types */ 274 switch (version) { 275 case 1: 276 code1 = SSH_AGENTC_REQUEST_RSA_IDENTITIES; 277 code2 = SSH_AGENT_RSA_IDENTITIES_ANSWER; 278 break; 279 case 2: 280 code1 = SSH2_AGENTC_REQUEST_IDENTITIES; 281 code2 = SSH2_AGENT_IDENTITIES_ANSWER; 282 break; 283 default: 284 return SSH_ERR_INVALID_ARGUMENT; 285 } 286 287 /* 288 * Send a message to the agent requesting for a list of the 289 * identities it can represent. 290 */ 291 if ((msg = sshbuf_new()) == NULL) 292 return SSH_ERR_ALLOC_FAIL; 293 if ((r = sshbuf_put_u8(msg, code1)) != 0) 294 goto out; 295 296 if ((r = ssh_request_reply(sock, msg, msg)) != 0) 297 goto out; 298 299 /* Get message type, and verify that we got a proper answer. */ 300 if ((r = sshbuf_get_u8(msg, &type)) != 0) 301 goto out; 302 if (agent_failed(type)) { 303 r = SSH_ERR_AGENT_FAILURE; 304 goto out; 305 } else if (type != code2) { 306 r = SSH_ERR_INVALID_FORMAT; 307 goto out; 308 } 309 310 /* Get the number of entries in the response and check it for sanity. */ 311 if ((r = sshbuf_get_u32(msg, &num)) != 0) 312 goto out; 313 if (num > MAX_AGENT_IDENTITIES) { 314 r = SSH_ERR_INVALID_FORMAT; 315 goto out; 316 } 317 if (num == 0) { 318 r = SSH_ERR_AGENT_NO_IDENTITIES; 319 goto out; 320 } 321 322 /* Deserialise the response into a list of keys/comments */ 323 if ((idl = calloc(1, sizeof(*idl))) == NULL || 324 (idl->keys = calloc(num, sizeof(*idl->keys))) == NULL || 325 (idl->comments = calloc(num, sizeof(*idl->comments))) == NULL) { 326 r = SSH_ERR_ALLOC_FAIL; 327 goto out; 328 } 329 for (i = 0; i < num;) { 330 switch (version) { 331 case 1: 332 #ifdef WITH_SSH1 333 if ((r = deserialise_identity1(msg, 334 &(idl->keys[i]), &(idl->comments[i]))) != 0) 335 goto out; 336 #endif 337 break; 338 case 2: 339 if ((r = deserialise_identity2(msg, 340 &(idl->keys[i]), &(idl->comments[i]))) != 0) { 341 if (r == SSH_ERR_KEY_TYPE_UNKNOWN) { 342 /* Gracefully skip unknown key types */ 343 num--; 344 continue; 345 } else 346 goto out; 347 } 348 break; 349 } 350 i++; 351 } 352 idl->nkeys = num; 353 *idlp = idl; 354 idl = NULL; 355 r = 0; 356 out: 357 sshbuf_free(msg); 358 if (idl != NULL) 359 ssh_free_identitylist(idl); 360 return r; 361 } 362 363 void 364 ssh_free_identitylist(struct ssh_identitylist *idl) 365 { 366 size_t i; 367 368 if (idl == NULL) 369 return; 370 for (i = 0; i < idl->nkeys; i++) { 371 if (idl->keys != NULL) 372 sshkey_free(idl->keys[i]); 373 if (idl->comments != NULL) 374 free(idl->comments[i]); 375 } 376 free(idl); 377 } 378 379 /* 380 * Sends a challenge (typically from a server via ssh(1)) to the agent, 381 * and waits for a response from the agent. 382 * Returns true (non-zero) if the agent gave the correct answer, zero 383 * otherwise. 384 */ 385 386 #ifdef WITH_SSH1 387 int 388 ssh_decrypt_challenge(int sock, struct sshkey* key, BIGNUM *challenge, 389 u_char session_id[16], u_char response[16]) 390 { 391 struct sshbuf *msg; 392 int r; 393 u_char type; 394 395 if (key->type != KEY_RSA1) 396 return SSH_ERR_INVALID_ARGUMENT; 397 if ((msg = sshbuf_new()) == NULL) 398 return SSH_ERR_ALLOC_FAIL; 399 if ((r = sshbuf_put_u8(msg, SSH_AGENTC_RSA_CHALLENGE)) != 0 || 400 (r = sshbuf_put_u32(msg, BN_num_bits(key->rsa->n))) != 0 || 401 (r = sshbuf_put_bignum1(msg, key->rsa->e)) != 0 || 402 (r = sshbuf_put_bignum1(msg, key->rsa->n)) != 0 || 403 (r = sshbuf_put_bignum1(msg, challenge)) != 0 || 404 (r = sshbuf_put(msg, session_id, 16)) != 0 || 405 (r = sshbuf_put_u32(msg, 1)) != 0) /* Response type for proto 1.1 */ 406 goto out; 407 if ((r = ssh_request_reply(sock, msg, msg)) != 0) 408 goto out; 409 if ((r = sshbuf_get_u8(msg, &type)) != 0) 410 goto out; 411 if (agent_failed(type)) { 412 r = SSH_ERR_AGENT_FAILURE; 413 goto out; 414 } else if (type != SSH_AGENT_RSA_RESPONSE) { 415 r = SSH_ERR_INVALID_FORMAT; 416 goto out; 417 } 418 if ((r = sshbuf_get(msg, response, 16)) != 0) 419 goto out; 420 r = 0; 421 out: 422 sshbuf_free(msg); 423 return r; 424 } 425 #endif 426 427 /* encode signature algoritm in flag bits, so we can keep the msg format */ 428 static u_int 429 agent_encode_alg(struct sshkey *key, const char *alg) 430 { 431 if (alg != NULL && key->type == KEY_RSA) { 432 if (strcmp(alg, "rsa-sha2-256") == 0) 433 return SSH_AGENT_RSA_SHA2_256; 434 else if (strcmp(alg, "rsa-sha2-512") == 0) 435 return SSH_AGENT_RSA_SHA2_512; 436 } 437 return 0; 438 } 439 440 /* ask agent to sign data, returns err.h code on error, 0 on success */ 441 int 442 ssh_agent_sign(int sock, struct sshkey *key, 443 u_char **sigp, size_t *lenp, 444 const u_char *data, size_t datalen, const char *alg, u_int compat) 445 { 446 struct sshbuf *msg; 447 u_char *blob = NULL, type; 448 size_t blen = 0, len = 0; 449 u_int flags = 0; 450 int r = SSH_ERR_INTERNAL_ERROR; 451 452 *sigp = NULL; 453 *lenp = 0; 454 455 if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE) 456 return SSH_ERR_INVALID_ARGUMENT; 457 if (compat & SSH_BUG_SIGBLOB) 458 flags |= SSH_AGENT_OLD_SIGNATURE; 459 if ((msg = sshbuf_new()) == NULL) 460 return SSH_ERR_ALLOC_FAIL; 461 if ((r = sshkey_to_blob(key, &blob, &blen)) != 0) 462 goto out; 463 flags |= agent_encode_alg(key, alg); 464 if ((r = sshbuf_put_u8(msg, SSH2_AGENTC_SIGN_REQUEST)) != 0 || 465 (r = sshbuf_put_string(msg, blob, blen)) != 0 || 466 (r = sshbuf_put_string(msg, data, datalen)) != 0 || 467 (r = sshbuf_put_u32(msg, flags)) != 0) 468 goto out; 469 if ((r = ssh_request_reply(sock, msg, msg)) != 0) 470 goto out; 471 if ((r = sshbuf_get_u8(msg, &type)) != 0) 472 goto out; 473 if (agent_failed(type)) { 474 r = SSH_ERR_AGENT_FAILURE; 475 goto out; 476 } else if (type != SSH2_AGENT_SIGN_RESPONSE) { 477 r = SSH_ERR_INVALID_FORMAT; 478 goto out; 479 } 480 if ((r = sshbuf_get_string(msg, sigp, &len)) != 0) 481 goto out; 482 *lenp = len; 483 r = 0; 484 out: 485 if (blob != NULL) { 486 explicit_bzero(blob, blen); 487 free(blob); 488 } 489 sshbuf_free(msg); 490 return r; 491 } 492 493 /* Encode key for a message to the agent. */ 494 495 #ifdef WITH_SSH1 496 static int 497 ssh_encode_identity_rsa1(struct sshbuf *b, RSA *key, const char *comment) 498 { 499 int r; 500 501 /* To keep within the protocol: p < q for ssh. in SSL p > q */ 502 if ((r = sshbuf_put_u32(b, BN_num_bits(key->n))) != 0 || 503 (r = sshbuf_put_bignum1(b, key->n)) != 0 || 504 (r = sshbuf_put_bignum1(b, key->e)) != 0 || 505 (r = sshbuf_put_bignum1(b, key->d)) != 0 || 506 (r = sshbuf_put_bignum1(b, key->iqmp)) != 0 || 507 (r = sshbuf_put_bignum1(b, key->q)) != 0 || 508 (r = sshbuf_put_bignum1(b, key->p)) != 0 || 509 (r = sshbuf_put_cstring(b, comment)) != 0) 510 return r; 511 return 0; 512 } 513 #endif 514 515 static int 516 ssh_encode_identity_ssh2(struct sshbuf *b, struct sshkey *key, 517 const char *comment) 518 { 519 int r; 520 521 if ((r = sshkey_private_serialize(key, b)) != 0 || 522 (r = sshbuf_put_cstring(b, comment)) != 0) 523 return r; 524 return 0; 525 } 526 527 static int 528 encode_constraints(struct sshbuf *m, u_int life, u_int confirm) 529 { 530 int r; 531 532 if (life != 0) { 533 if ((r = sshbuf_put_u8(m, SSH_AGENT_CONSTRAIN_LIFETIME)) != 0 || 534 (r = sshbuf_put_u32(m, life)) != 0) 535 goto out; 536 } 537 if (confirm != 0) { 538 if ((r = sshbuf_put_u8(m, SSH_AGENT_CONSTRAIN_CONFIRM)) != 0) 539 goto out; 540 } 541 r = 0; 542 out: 543 return r; 544 } 545 546 /* 547 * Adds an identity to the authentication server. 548 * This call is intended only for use by ssh-add(1) and like applications. 549 */ 550 int 551 ssh_add_identity_constrained(int sock, struct sshkey *key, const char *comment, 552 u_int life, u_int confirm) 553 { 554 struct sshbuf *msg; 555 int r, constrained = (life || confirm); 556 u_char type; 557 558 if ((msg = sshbuf_new()) == NULL) 559 return SSH_ERR_ALLOC_FAIL; 560 561 switch (key->type) { 562 #ifdef WITH_SSH1 563 case KEY_RSA1: 564 type = constrained ? 565 SSH_AGENTC_ADD_RSA_ID_CONSTRAINED : 566 SSH_AGENTC_ADD_RSA_IDENTITY; 567 if ((r = sshbuf_put_u8(msg, type)) != 0 || 568 (r = ssh_encode_identity_rsa1(msg, key->rsa, comment)) != 0) 569 goto out; 570 break; 571 #endif 572 #ifdef WITH_OPENSSL 573 case KEY_RSA: 574 case KEY_RSA_CERT: 575 case KEY_DSA: 576 case KEY_DSA_CERT: 577 case KEY_ECDSA: 578 case KEY_ECDSA_CERT: 579 #endif 580 case KEY_ED25519: 581 case KEY_ED25519_CERT: 582 type = constrained ? 583 SSH2_AGENTC_ADD_ID_CONSTRAINED : 584 SSH2_AGENTC_ADD_IDENTITY; 585 if ((r = sshbuf_put_u8(msg, type)) != 0 || 586 (r = ssh_encode_identity_ssh2(msg, key, comment)) != 0) 587 goto out; 588 break; 589 default: 590 r = SSH_ERR_INVALID_ARGUMENT; 591 goto out; 592 } 593 if (constrained && 594 (r = encode_constraints(msg, life, confirm)) != 0) 595 goto out; 596 if ((r = ssh_request_reply(sock, msg, msg)) != 0) 597 goto out; 598 if ((r = sshbuf_get_u8(msg, &type)) != 0) 599 goto out; 600 r = decode_reply(type); 601 out: 602 sshbuf_free(msg); 603 return r; 604 } 605 606 /* 607 * Removes an identity from the authentication server. 608 * This call is intended only for use by ssh-add(1) and like applications. 609 */ 610 int 611 ssh_remove_identity(int sock, struct sshkey *key) 612 { 613 struct sshbuf *msg; 614 int r; 615 u_char type, *blob = NULL; 616 size_t blen; 617 618 if ((msg = sshbuf_new()) == NULL) 619 return SSH_ERR_ALLOC_FAIL; 620 621 #ifdef WITH_SSH1 622 if (key->type == KEY_RSA1) { 623 if ((r = sshbuf_put_u8(msg, 624 SSH_AGENTC_REMOVE_RSA_IDENTITY)) != 0 || 625 (r = sshbuf_put_u32(msg, BN_num_bits(key->rsa->n))) != 0 || 626 (r = sshbuf_put_bignum1(msg, key->rsa->e)) != 0 || 627 (r = sshbuf_put_bignum1(msg, key->rsa->n)) != 0) 628 goto out; 629 } else 630 #endif 631 if (key->type != KEY_UNSPEC) { 632 if ((r = sshkey_to_blob(key, &blob, &blen)) != 0) 633 goto out; 634 if ((r = sshbuf_put_u8(msg, 635 SSH2_AGENTC_REMOVE_IDENTITY)) != 0 || 636 (r = sshbuf_put_string(msg, blob, blen)) != 0) 637 goto out; 638 } else { 639 r = SSH_ERR_INVALID_ARGUMENT; 640 goto out; 641 } 642 if ((r = ssh_request_reply(sock, msg, msg)) != 0) 643 goto out; 644 if ((r = sshbuf_get_u8(msg, &type)) != 0) 645 goto out; 646 r = decode_reply(type); 647 out: 648 if (blob != NULL) { 649 explicit_bzero(blob, blen); 650 free(blob); 651 } 652 sshbuf_free(msg); 653 return r; 654 } 655 656 /* 657 * Add/remove an token-based identity from the authentication server. 658 * This call is intended only for use by ssh-add(1) and like applications. 659 */ 660 int 661 ssh_update_card(int sock, int add, const char *reader_id, const char *pin, 662 u_int life, u_int confirm) 663 { 664 struct sshbuf *msg; 665 int r, constrained = (life || confirm); 666 u_char type; 667 668 if (add) { 669 type = constrained ? 670 SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED : 671 SSH_AGENTC_ADD_SMARTCARD_KEY; 672 } else 673 type = SSH_AGENTC_REMOVE_SMARTCARD_KEY; 674 675 if ((msg = sshbuf_new()) == NULL) 676 return SSH_ERR_ALLOC_FAIL; 677 if ((r = sshbuf_put_u8(msg, type)) != 0 || 678 (r = sshbuf_put_cstring(msg, reader_id)) != 0 || 679 (r = sshbuf_put_cstring(msg, pin)) != 0) 680 goto out; 681 if (constrained && 682 (r = encode_constraints(msg, life, confirm)) != 0) 683 goto out; 684 if ((r = ssh_request_reply(sock, msg, msg)) != 0) 685 goto out; 686 if ((r = sshbuf_get_u8(msg, &type)) != 0) 687 goto out; 688 r = decode_reply(type); 689 out: 690 sshbuf_free(msg); 691 return r; 692 } 693 694 /* 695 * Removes all identities from the agent. 696 * This call is intended only for use by ssh-add(1) and like applications. 697 */ 698 int 699 ssh_remove_all_identities(int sock, int version) 700 { 701 struct sshbuf *msg; 702 u_char type = (version == 1) ? 703 SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES : 704 SSH2_AGENTC_REMOVE_ALL_IDENTITIES; 705 int r; 706 707 if ((msg = sshbuf_new()) == NULL) 708 return SSH_ERR_ALLOC_FAIL; 709 if ((r = sshbuf_put_u8(msg, type)) != 0) 710 goto out; 711 if ((r = ssh_request_reply(sock, msg, msg)) != 0) 712 goto out; 713 if ((r = sshbuf_get_u8(msg, &type)) != 0) 714 goto out; 715 r = decode_reply(type); 716 out: 717 sshbuf_free(msg); 718 return r; 719 } 720