1 /* $OpenBSD: authfd.c,v 1.130 2022/04/27 11:08:55 dtucker 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 <fcntl.h> 45 #include <stdlib.h> 46 #include <signal.h> 47 #include <string.h> 48 #include <stdarg.h> 49 #include <unistd.h> 50 #include <errno.h> 51 52 #include "xmalloc.h" 53 #include "ssh.h" 54 #include "sshbuf.h" 55 #include "sshkey.h" 56 #include "authfd.h" 57 #include "cipher.h" 58 #include "compat.h" 59 #include "log.h" 60 #include "atomicio.h" 61 #include "misc.h" 62 #include "ssherr.h" 63 64 #define MAX_AGENT_IDENTITIES 2048 /* Max keys in agent reply */ 65 #define MAX_AGENT_REPLY_LEN (256 * 1024) /* Max bytes in agent reply */ 66 67 /* macro to check for "agent failure" message */ 68 #define agent_failed(x) \ 69 ((x == SSH_AGENT_FAILURE) || \ 70 (x == SSH_COM_AGENT2_FAILURE) || \ 71 (x == SSH2_AGENT_FAILURE)) 72 73 /* Convert success/failure response from agent to a err.h status */ 74 static int 75 decode_reply(u_char type) 76 { 77 if (agent_failed(type)) 78 return SSH_ERR_AGENT_FAILURE; 79 else if (type == SSH_AGENT_SUCCESS) 80 return 0; 81 else 82 return SSH_ERR_INVALID_FORMAT; 83 } 84 85 /* 86 * Opens an authentication socket at the provided path and stores the file 87 * descriptor in fdp. Returns 0 on success and an error on failure. 88 */ 89 int 90 ssh_get_authentication_socket_path(const char *authsocket, int *fdp) 91 { 92 int sock, oerrno; 93 struct sockaddr_un sunaddr; 94 95 debug3_f("path '%s'", authsocket); 96 memset(&sunaddr, 0, sizeof(sunaddr)); 97 sunaddr.sun_family = AF_UNIX; 98 strlcpy(sunaddr.sun_path, authsocket, sizeof(sunaddr.sun_path)); 99 100 if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) 101 return SSH_ERR_SYSTEM_ERROR; 102 103 /* close on exec */ 104 if (fcntl(sock, F_SETFD, FD_CLOEXEC) == -1 || 105 connect(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) { 106 oerrno = errno; 107 close(sock); 108 errno = oerrno; 109 return SSH_ERR_SYSTEM_ERROR; 110 } 111 if (fdp != NULL) 112 *fdp = sock; 113 else 114 close(sock); 115 return 0; 116 } 117 118 /* 119 * Opens the default authentication socket and stores the file descriptor in 120 * fdp. Returns 0 on success and an error on failure. 121 */ 122 int 123 ssh_get_authentication_socket(int *fdp) 124 { 125 const char *authsocket; 126 127 if (fdp != NULL) 128 *fdp = -1; 129 130 authsocket = getenv(SSH_AUTHSOCKET_ENV_NAME); 131 if (authsocket == NULL || *authsocket == '\0') 132 return SSH_ERR_AGENT_NOT_PRESENT; 133 134 return ssh_get_authentication_socket_path(authsocket, fdp); 135 } 136 137 /* Communicate with agent: send request and read reply */ 138 static int 139 ssh_request_reply(int sock, struct sshbuf *request, struct sshbuf *reply) 140 { 141 int r; 142 size_t l, len; 143 char buf[1024]; 144 145 /* Get the length of the message, and format it in the buffer. */ 146 len = sshbuf_len(request); 147 POKE_U32(buf, len); 148 149 /* Send the length and then the packet to the agent. */ 150 if (atomicio(vwrite, sock, buf, 4) != 4 || 151 atomicio(vwrite, sock, sshbuf_mutable_ptr(request), 152 sshbuf_len(request)) != sshbuf_len(request)) 153 return SSH_ERR_AGENT_COMMUNICATION; 154 /* 155 * Wait for response from the agent. First read the length of the 156 * response packet. 157 */ 158 if (atomicio(read, sock, buf, 4) != 4) 159 return SSH_ERR_AGENT_COMMUNICATION; 160 161 /* Extract the length, and check it for sanity. */ 162 len = PEEK_U32(buf); 163 if (len > MAX_AGENT_REPLY_LEN) 164 return SSH_ERR_INVALID_FORMAT; 165 166 /* Read the rest of the response in to the buffer. */ 167 sshbuf_reset(reply); 168 while (len > 0) { 169 l = len; 170 if (l > sizeof(buf)) 171 l = sizeof(buf); 172 if (atomicio(read, sock, buf, l) != l) 173 return SSH_ERR_AGENT_COMMUNICATION; 174 if ((r = sshbuf_put(reply, buf, l)) != 0) 175 return r; 176 len -= l; 177 } 178 return 0; 179 } 180 181 /* Communicate with agent: sent request, read and decode status reply */ 182 static int 183 ssh_request_reply_decode(int sock, struct sshbuf *request) 184 { 185 struct sshbuf *reply; 186 int r; 187 u_char type; 188 189 if ((reply = sshbuf_new()) == NULL) 190 return SSH_ERR_ALLOC_FAIL; 191 if ((r = ssh_request_reply(sock, request, reply)) != 0 || 192 (r = sshbuf_get_u8(reply, &type)) != 0 || 193 (r = decode_reply(type)) != 0) 194 goto out; 195 /* success */ 196 r = 0; 197 out: 198 sshbuf_free(reply); 199 return r; 200 } 201 202 /* 203 * Closes the agent socket if it should be closed (depends on how it was 204 * obtained). The argument must have been returned by 205 * ssh_get_authentication_socket(). 206 */ 207 void 208 ssh_close_authentication_socket(int sock) 209 { 210 if (getenv(SSH_AUTHSOCKET_ENV_NAME)) 211 close(sock); 212 } 213 214 /* Lock/unlock agent */ 215 int 216 ssh_lock_agent(int sock, int lock, const char *password) 217 { 218 int r; 219 u_char type = lock ? SSH_AGENTC_LOCK : SSH_AGENTC_UNLOCK; 220 struct sshbuf *msg; 221 222 if ((msg = sshbuf_new()) == NULL) 223 return SSH_ERR_ALLOC_FAIL; 224 if ((r = sshbuf_put_u8(msg, type)) != 0 || 225 (r = sshbuf_put_cstring(msg, password)) != 0 || 226 (r = ssh_request_reply_decode(sock, msg)) != 0) 227 goto out; 228 /* success */ 229 r = 0; 230 out: 231 sshbuf_free(msg); 232 return r; 233 } 234 235 236 static int 237 deserialise_identity2(struct sshbuf *ids, struct sshkey **keyp, char **commentp) 238 { 239 int r; 240 char *comment = NULL; 241 const u_char *blob; 242 size_t blen; 243 244 if ((r = sshbuf_get_string_direct(ids, &blob, &blen)) != 0 || 245 (r = sshbuf_get_cstring(ids, &comment, NULL)) != 0) 246 goto out; 247 if ((r = sshkey_from_blob(blob, blen, keyp)) != 0) 248 goto out; 249 if (commentp != NULL) { 250 *commentp = comment; 251 comment = NULL; 252 } 253 r = 0; 254 out: 255 free(comment); 256 return r; 257 } 258 259 /* 260 * Fetch list of identities held by the agent. 261 */ 262 int 263 ssh_fetch_identitylist(int sock, struct ssh_identitylist **idlp) 264 { 265 u_char type; 266 u_int32_t num, i; 267 struct sshbuf *msg; 268 struct ssh_identitylist *idl = NULL; 269 int r; 270 271 /* 272 * Send a message to the agent requesting for a list of the 273 * identities it can represent. 274 */ 275 if ((msg = sshbuf_new()) == NULL) 276 return SSH_ERR_ALLOC_FAIL; 277 if ((r = sshbuf_put_u8(msg, SSH2_AGENTC_REQUEST_IDENTITIES)) != 0) 278 goto out; 279 280 if ((r = ssh_request_reply(sock, msg, msg)) != 0) 281 goto out; 282 283 /* Get message type, and verify that we got a proper answer. */ 284 if ((r = sshbuf_get_u8(msg, &type)) != 0) 285 goto out; 286 if (agent_failed(type)) { 287 r = SSH_ERR_AGENT_FAILURE; 288 goto out; 289 } else if (type != SSH2_AGENT_IDENTITIES_ANSWER) { 290 r = SSH_ERR_INVALID_FORMAT; 291 goto out; 292 } 293 294 /* Get the number of entries in the response and check it for sanity. */ 295 if ((r = sshbuf_get_u32(msg, &num)) != 0) 296 goto out; 297 if (num > MAX_AGENT_IDENTITIES) { 298 r = SSH_ERR_INVALID_FORMAT; 299 goto out; 300 } 301 if (num == 0) { 302 r = SSH_ERR_AGENT_NO_IDENTITIES; 303 goto out; 304 } 305 306 /* Deserialise the response into a list of keys/comments */ 307 if ((idl = calloc(1, sizeof(*idl))) == NULL || 308 (idl->keys = calloc(num, sizeof(*idl->keys))) == NULL || 309 (idl->comments = calloc(num, sizeof(*idl->comments))) == NULL) { 310 r = SSH_ERR_ALLOC_FAIL; 311 goto out; 312 } 313 for (i = 0; i < num;) { 314 if ((r = deserialise_identity2(msg, &(idl->keys[i]), 315 &(idl->comments[i]))) != 0) { 316 if (r == SSH_ERR_KEY_TYPE_UNKNOWN) { 317 /* Gracefully skip unknown key types */ 318 num--; 319 continue; 320 } else 321 goto out; 322 } 323 i++; 324 } 325 idl->nkeys = num; 326 *idlp = idl; 327 idl = NULL; 328 r = 0; 329 out: 330 sshbuf_free(msg); 331 if (idl != NULL) 332 ssh_free_identitylist(idl); 333 return r; 334 } 335 336 void 337 ssh_free_identitylist(struct ssh_identitylist *idl) 338 { 339 size_t i; 340 341 if (idl == NULL) 342 return; 343 for (i = 0; i < idl->nkeys; i++) { 344 if (idl->keys != NULL) 345 sshkey_free(idl->keys[i]); 346 if (idl->comments != NULL) 347 free(idl->comments[i]); 348 } 349 free(idl->keys); 350 free(idl->comments); 351 free(idl); 352 } 353 354 /* 355 * Check if the ssh agent has a given key. 356 * Returns 0 if found, or a negative SSH_ERR_* error code on failure. 357 */ 358 int 359 ssh_agent_has_key(int sock, const struct sshkey *key) 360 { 361 int r, ret = SSH_ERR_KEY_NOT_FOUND; 362 size_t i; 363 struct ssh_identitylist *idlist = NULL; 364 365 if ((r = ssh_fetch_identitylist(sock, &idlist)) != 0) { 366 return r; 367 } 368 369 for (i = 0; i < idlist->nkeys; i++) { 370 if (sshkey_equal_public(idlist->keys[i], key)) { 371 ret = 0; 372 break; 373 } 374 } 375 376 ssh_free_identitylist(idlist); 377 return ret; 378 } 379 380 /* 381 * Sends a challenge (typically from a server via ssh(1)) to the agent, 382 * and waits for a response from the agent. 383 * Returns true (non-zero) if the agent gave the correct answer, zero 384 * otherwise. 385 */ 386 387 388 /* encode signature algorithm in flag bits, so we can keep the msg format */ 389 static u_int 390 agent_encode_alg(const struct sshkey *key, const char *alg) 391 { 392 if (alg != NULL && sshkey_type_plain(key->type) == KEY_RSA) { 393 if (strcmp(alg, "rsa-sha2-256") == 0 || 394 strcmp(alg, "rsa-sha2-256-cert-v01@openssh.com") == 0) 395 return SSH_AGENT_RSA_SHA2_256; 396 if (strcmp(alg, "rsa-sha2-512") == 0 || 397 strcmp(alg, "rsa-sha2-512-cert-v01@openssh.com") == 0) 398 return SSH_AGENT_RSA_SHA2_512; 399 } 400 return 0; 401 } 402 403 /* ask agent to sign data, returns err.h code on error, 0 on success */ 404 int 405 ssh_agent_sign(int sock, const struct sshkey *key, 406 u_char **sigp, size_t *lenp, 407 const u_char *data, size_t datalen, const char *alg, u_int compat) 408 { 409 struct sshbuf *msg; 410 u_char *sig = NULL, type = 0; 411 size_t len = 0; 412 u_int flags = 0; 413 int r = SSH_ERR_INTERNAL_ERROR; 414 415 *sigp = NULL; 416 *lenp = 0; 417 418 if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE) 419 return SSH_ERR_INVALID_ARGUMENT; 420 if ((msg = sshbuf_new()) == NULL) 421 return SSH_ERR_ALLOC_FAIL; 422 flags |= agent_encode_alg(key, alg); 423 if ((r = sshbuf_put_u8(msg, SSH2_AGENTC_SIGN_REQUEST)) != 0 || 424 (r = sshkey_puts(key, msg)) != 0 || 425 (r = sshbuf_put_string(msg, data, datalen)) != 0 || 426 (r = sshbuf_put_u32(msg, flags)) != 0) 427 goto out; 428 if ((r = ssh_request_reply(sock, msg, msg)) != 0) 429 goto out; 430 if ((r = sshbuf_get_u8(msg, &type)) != 0) 431 goto out; 432 if (agent_failed(type)) { 433 r = SSH_ERR_AGENT_FAILURE; 434 goto out; 435 } else if (type != SSH2_AGENT_SIGN_RESPONSE) { 436 r = SSH_ERR_INVALID_FORMAT; 437 goto out; 438 } 439 if ((r = sshbuf_get_string(msg, &sig, &len)) != 0) 440 goto out; 441 /* Check what we actually got back from the agent. */ 442 if ((r = sshkey_check_sigtype(sig, len, alg)) != 0) 443 goto out; 444 /* success */ 445 *sigp = sig; 446 *lenp = len; 447 sig = NULL; 448 len = 0; 449 r = 0; 450 out: 451 freezero(sig, len); 452 sshbuf_free(msg); 453 return r; 454 } 455 456 /* Encode key for a message to the agent. */ 457 458 static int 459 encode_dest_constraint_hop(struct sshbuf *m, 460 const struct dest_constraint_hop *dch) 461 { 462 struct sshbuf *b; 463 u_int i; 464 int r; 465 466 if ((b = sshbuf_new()) == NULL) 467 return SSH_ERR_ALLOC_FAIL; 468 if ((r = sshbuf_put_cstring(b, dch->user)) != 0 || 469 (r = sshbuf_put_cstring(b, dch->hostname)) != 0 || 470 (r = sshbuf_put_string(b, NULL, 0)) != 0) /* reserved */ 471 goto out; 472 for (i = 0; i < dch->nkeys; i++) { 473 if ((r = sshkey_puts(dch->keys[i], b)) != 0 || 474 (r = sshbuf_put_u8(b, dch->key_is_ca[i] != 0)) != 0) 475 goto out; 476 } 477 if ((r = sshbuf_put_stringb(m, b)) != 0) 478 goto out; 479 /* success */ 480 r = 0; 481 out: 482 sshbuf_free(b); 483 return r; 484 } 485 486 static int 487 encode_dest_constraint(struct sshbuf *m, const struct dest_constraint *dc) 488 { 489 struct sshbuf *b; 490 int r; 491 492 if ((b = sshbuf_new()) == NULL) 493 return SSH_ERR_ALLOC_FAIL; 494 if ((r = encode_dest_constraint_hop(b, &dc->from) != 0) || 495 (r = encode_dest_constraint_hop(b, &dc->to) != 0) || 496 (r = sshbuf_put_string(b, NULL, 0)) != 0) /* reserved */ 497 goto out; 498 if ((r = sshbuf_put_stringb(m, b)) != 0) 499 goto out; 500 /* success */ 501 r = 0; 502 out: 503 sshbuf_free(b); 504 return r; 505 } 506 507 static int 508 encode_constraints(struct sshbuf *m, u_int life, u_int confirm, u_int maxsign, 509 const char *provider, struct dest_constraint **dest_constraints, 510 size_t ndest_constraints) 511 { 512 int r; 513 struct sshbuf *b = NULL; 514 size_t i; 515 516 if (life != 0) { 517 if ((r = sshbuf_put_u8(m, SSH_AGENT_CONSTRAIN_LIFETIME)) != 0 || 518 (r = sshbuf_put_u32(m, life)) != 0) 519 goto out; 520 } 521 if (confirm != 0) { 522 if ((r = sshbuf_put_u8(m, SSH_AGENT_CONSTRAIN_CONFIRM)) != 0) 523 goto out; 524 } 525 if (maxsign != 0) { 526 if ((r = sshbuf_put_u8(m, SSH_AGENT_CONSTRAIN_MAXSIGN)) != 0 || 527 (r = sshbuf_put_u32(m, maxsign)) != 0) 528 goto out; 529 } 530 if (provider != NULL) { 531 if ((r = sshbuf_put_u8(m, 532 SSH_AGENT_CONSTRAIN_EXTENSION)) != 0 || 533 (r = sshbuf_put_cstring(m, 534 "sk-provider@openssh.com")) != 0 || 535 (r = sshbuf_put_cstring(m, provider)) != 0) 536 goto out; 537 } 538 if (dest_constraints != NULL && ndest_constraints > 0) { 539 if ((b = sshbuf_new()) == NULL) { 540 r = SSH_ERR_ALLOC_FAIL; 541 goto out; 542 } 543 for (i = 0; i < ndest_constraints; i++) { 544 if ((r = encode_dest_constraint(b, 545 dest_constraints[i])) != 0) 546 goto out; 547 } 548 if ((r = sshbuf_put_u8(m, 549 SSH_AGENT_CONSTRAIN_EXTENSION)) != 0 || 550 (r = sshbuf_put_cstring(m, 551 "restrict-destination-v00@openssh.com")) != 0 || 552 (r = sshbuf_put_stringb(m, b)) != 0) 553 goto out; 554 } 555 r = 0; 556 out: 557 sshbuf_free(b); 558 return r; 559 } 560 561 /* 562 * Adds an identity to the authentication server. 563 * This call is intended only for use by ssh-add(1) and like applications. 564 */ 565 int 566 ssh_add_identity_constrained(int sock, struct sshkey *key, 567 const char *comment, u_int life, u_int confirm, u_int maxsign, 568 const char *provider, struct dest_constraint **dest_constraints, 569 size_t ndest_constraints) 570 { 571 struct sshbuf *msg; 572 int r, constrained = (life || confirm || maxsign || 573 provider || dest_constraints); 574 u_char type; 575 576 if ((msg = sshbuf_new()) == NULL) 577 return SSH_ERR_ALLOC_FAIL; 578 579 switch (key->type) { 580 #ifdef WITH_OPENSSL 581 case KEY_RSA: 582 case KEY_RSA_CERT: 583 case KEY_DSA: 584 case KEY_DSA_CERT: 585 case KEY_ECDSA: 586 case KEY_ECDSA_CERT: 587 case KEY_ECDSA_SK: 588 case KEY_ECDSA_SK_CERT: 589 #endif 590 case KEY_ED25519: 591 case KEY_ED25519_CERT: 592 case KEY_ED25519_SK: 593 case KEY_ED25519_SK_CERT: 594 case KEY_XMSS: 595 case KEY_XMSS_CERT: 596 type = constrained ? 597 SSH2_AGENTC_ADD_ID_CONSTRAINED : 598 SSH2_AGENTC_ADD_IDENTITY; 599 if ((r = sshbuf_put_u8(msg, type)) != 0 || 600 (r = sshkey_private_serialize_maxsign(key, msg, maxsign, 601 0)) != 0 || 602 (r = sshbuf_put_cstring(msg, comment)) != 0) 603 goto out; 604 break; 605 default: 606 r = SSH_ERR_INVALID_ARGUMENT; 607 goto out; 608 } 609 if (constrained && 610 (r = encode_constraints(msg, life, confirm, maxsign, 611 provider, dest_constraints, ndest_constraints)) != 0) 612 goto out; 613 if ((r = ssh_request_reply_decode(sock, msg)) != 0) 614 goto out; 615 /* success */ 616 r = 0; 617 out: 618 sshbuf_free(msg); 619 return r; 620 } 621 622 /* 623 * Removes an identity from the authentication server. 624 * This call is intended only for use by ssh-add(1) and like applications. 625 */ 626 int 627 ssh_remove_identity(int sock, const struct sshkey *key) 628 { 629 struct sshbuf *msg; 630 int r; 631 u_char *blob = NULL; 632 size_t blen; 633 634 if ((msg = sshbuf_new()) == NULL) 635 return SSH_ERR_ALLOC_FAIL; 636 637 if (key->type != KEY_UNSPEC) { 638 if ((r = sshkey_to_blob(key, &blob, &blen)) != 0) 639 goto out; 640 if ((r = sshbuf_put_u8(msg, 641 SSH2_AGENTC_REMOVE_IDENTITY)) != 0 || 642 (r = sshbuf_put_string(msg, blob, blen)) != 0) 643 goto out; 644 } else { 645 r = SSH_ERR_INVALID_ARGUMENT; 646 goto out; 647 } 648 if ((r = ssh_request_reply_decode(sock, msg)) != 0) 649 goto out; 650 /* success */ 651 r = 0; 652 out: 653 if (blob != NULL) 654 freezero(blob, blen); 655 sshbuf_free(msg); 656 return r; 657 } 658 659 /* 660 * Add/remove an token-based identity from the authentication server. 661 * This call is intended only for use by ssh-add(1) and like applications. 662 */ 663 int 664 ssh_update_card(int sock, int add, const char *reader_id, const char *pin, 665 u_int life, u_int confirm, 666 struct dest_constraint **dest_constraints, size_t ndest_constraints) 667 { 668 struct sshbuf *msg; 669 int r, constrained = (life || confirm); 670 u_char type; 671 672 if (add) { 673 type = constrained ? 674 SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED : 675 SSH_AGENTC_ADD_SMARTCARD_KEY; 676 } else 677 type = SSH_AGENTC_REMOVE_SMARTCARD_KEY; 678 679 if ((msg = sshbuf_new()) == NULL) 680 return SSH_ERR_ALLOC_FAIL; 681 if ((r = sshbuf_put_u8(msg, type)) != 0 || 682 (r = sshbuf_put_cstring(msg, reader_id)) != 0 || 683 (r = sshbuf_put_cstring(msg, pin)) != 0) 684 goto out; 685 if (constrained && 686 (r = encode_constraints(msg, life, confirm, 0, NULL, 687 dest_constraints, ndest_constraints)) != 0) 688 goto out; 689 if ((r = ssh_request_reply_decode(sock, msg)) != 0) 690 goto out; 691 /* success */ 692 r = 0; 693 out: 694 sshbuf_free(msg); 695 return r; 696 } 697 698 /* 699 * Removes all identities from the agent. 700 * This call is intended only for use by ssh-add(1) and like applications. 701 * 702 * This supports the SSH protocol 1 message to because, when clearing all 703 * keys from an agent, we generally want to clear both protocol v1 and v2 704 * keys. 705 */ 706 int 707 ssh_remove_all_identities(int sock, int version) 708 { 709 struct sshbuf *msg; 710 u_char type = (version == 1) ? 711 SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES : 712 SSH2_AGENTC_REMOVE_ALL_IDENTITIES; 713 int r; 714 715 if ((msg = sshbuf_new()) == NULL) 716 return SSH_ERR_ALLOC_FAIL; 717 if ((r = sshbuf_put_u8(msg, type)) != 0) 718 goto out; 719 if ((r = ssh_request_reply_decode(sock, msg)) != 0) 720 goto out; 721 /* success */ 722 r = 0; 723 out: 724 sshbuf_free(msg); 725 return r; 726 } 727 728 /* Binds a session ID to a hostkey via the initial KEX signature. */ 729 int 730 ssh_agent_bind_hostkey(int sock, const struct sshkey *key, 731 const struct sshbuf *session_id, const struct sshbuf *signature, 732 int forwarding) 733 { 734 struct sshbuf *msg; 735 int r; 736 737 if (key == NULL || session_id == NULL || signature == NULL) 738 return SSH_ERR_INVALID_ARGUMENT; 739 if ((msg = sshbuf_new()) == NULL) 740 return SSH_ERR_ALLOC_FAIL; 741 if ((r = sshbuf_put_u8(msg, SSH_AGENTC_EXTENSION)) != 0 || 742 (r = sshbuf_put_cstring(msg, "session-bind@openssh.com")) != 0 || 743 (r = sshkey_puts(key, msg)) != 0 || 744 (r = sshbuf_put_stringb(msg, session_id)) != 0 || 745 (r = sshbuf_put_stringb(msg, signature)) != 0 || 746 (r = sshbuf_put_u8(msg, forwarding ? 1 : 0)) != 0) 747 goto out; 748 if ((r = ssh_request_reply_decode(sock, msg)) != 0) 749 goto out; 750 /* success */ 751 r = 0; 752 out: 753 sshbuf_free(msg); 754 return r; 755 } 756