1/* $OpenBSD: authfd.c,v 1.134 2023/12/18 14:46:56 djm 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 "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 */ 73static int 74decode_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/* 85 * Opens an authentication socket at the provided path and stores the file 86 * descriptor in fdp. Returns 0 on success and an error on failure. 87 */ 88int 89ssh_get_authentication_socket_path(const char *authsocket, int *fdp) 90{ 91 int sock, oerrno; 92 struct sockaddr_un sunaddr; 93 94 debug3_f("path '%s'", authsocket); 95 memset(&sunaddr, 0, sizeof(sunaddr)); 96 sunaddr.sun_family = AF_UNIX; 97 strlcpy(sunaddr.sun_path, authsocket, sizeof(sunaddr.sun_path)); 98 99 if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) 100 return SSH_ERR_SYSTEM_ERROR; 101 102 /* close on exec */ 103 if (fcntl(sock, F_SETFD, FD_CLOEXEC) == -1 || 104 connect(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) { 105 oerrno = errno; 106 close(sock); 107 errno = oerrno; 108 return SSH_ERR_SYSTEM_ERROR; 109 } 110 if (fdp != NULL) 111 *fdp = sock; 112 else 113 close(sock); 114 return 0; 115} 116 117/* 118 * Opens the default authentication socket and stores the file descriptor in 119 * fdp. Returns 0 on success and an error on failure. 120 */ 121int 122ssh_get_authentication_socket(int *fdp) 123{ 124 const char *authsocket; 125 126 if (fdp != NULL) 127 *fdp = -1; 128 129 authsocket = getenv(SSH_AUTHSOCKET_ENV_NAME); 130 if (authsocket == NULL || *authsocket == '\0') 131 return SSH_ERR_AGENT_NOT_PRESENT; 132 133 return ssh_get_authentication_socket_path(authsocket, fdp); 134} 135 136/* Communicate with agent: send request and read reply */ 137static int 138ssh_request_reply(int sock, struct sshbuf *request, struct sshbuf *reply) 139{ 140 int r; 141 size_t l, len; 142 char buf[1024]; 143 144 /* Get the length of the message, and format it in the buffer. */ 145 len = sshbuf_len(request); 146 POKE_U32(buf, len); 147 148 /* Send the length and then the packet to the agent. */ 149 if (atomicio(vwrite, sock, buf, 4) != 4 || 150 atomicio(vwrite, sock, sshbuf_mutable_ptr(request), 151 sshbuf_len(request)) != sshbuf_len(request)) 152 return SSH_ERR_AGENT_COMMUNICATION; 153 /* 154 * Wait for response from the agent. First read the length of the 155 * response packet. 156 */ 157 if (atomicio(read, sock, buf, 4) != 4) 158 return SSH_ERR_AGENT_COMMUNICATION; 159 160 /* Extract the length, and check it for sanity. */ 161 len = PEEK_U32(buf); 162 if (len > MAX_AGENT_REPLY_LEN) 163 return SSH_ERR_INVALID_FORMAT; 164 165 /* Read the rest of the response in to the buffer. */ 166 sshbuf_reset(reply); 167 while (len > 0) { 168 l = len; 169 if (l > sizeof(buf)) 170 l = sizeof(buf); 171 if (atomicio(read, sock, buf, l) != l) 172 return SSH_ERR_AGENT_COMMUNICATION; 173 if ((r = sshbuf_put(reply, buf, l)) != 0) 174 return r; 175 len -= l; 176 } 177 return 0; 178} 179 180/* Communicate with agent: sent request, read and decode status reply */ 181static int 182ssh_request_reply_decode(int sock, struct sshbuf *request) 183{ 184 struct sshbuf *reply; 185 int r; 186 u_char type; 187 188 if ((reply = sshbuf_new()) == NULL) 189 return SSH_ERR_ALLOC_FAIL; 190 if ((r = ssh_request_reply(sock, request, reply)) != 0 || 191 (r = sshbuf_get_u8(reply, &type)) != 0 || 192 (r = decode_reply(type)) != 0) 193 goto out; 194 /* success */ 195 r = 0; 196 out: 197 sshbuf_free(reply); 198 return r; 199} 200 201/* 202 * Closes the agent socket if it should be closed (depends on how it was 203 * obtained). The argument must have been returned by 204 * ssh_get_authentication_socket(). 205 */ 206void 207ssh_close_authentication_socket(int sock) 208{ 209 if (getenv(SSH_AUTHSOCKET_ENV_NAME)) 210 close(sock); 211} 212 213/* Lock/unlock agent */ 214int 215ssh_lock_agent(int sock, int lock, const char *password) 216{ 217 int r; 218 u_char type = lock ? SSH_AGENTC_LOCK : SSH_AGENTC_UNLOCK; 219 struct sshbuf *msg; 220 221 if ((msg = sshbuf_new()) == NULL) 222 return SSH_ERR_ALLOC_FAIL; 223 if ((r = sshbuf_put_u8(msg, type)) != 0 || 224 (r = sshbuf_put_cstring(msg, password)) != 0 || 225 (r = ssh_request_reply_decode(sock, msg)) != 0) 226 goto out; 227 /* success */ 228 r = 0; 229 out: 230 sshbuf_free(msg); 231 return r; 232} 233 234 235static int 236deserialise_identity2(struct sshbuf *ids, struct sshkey **keyp, char **commentp) 237{ 238 int r; 239 char *comment = NULL; 240 const u_char *blob; 241 size_t blen; 242 243 if ((r = sshbuf_get_string_direct(ids, &blob, &blen)) != 0 || 244 (r = sshbuf_get_cstring(ids, &comment, NULL)) != 0) 245 goto out; 246 if ((r = sshkey_from_blob(blob, blen, keyp)) != 0) 247 goto out; 248 if (commentp != NULL) { 249 *commentp = comment; 250 comment = NULL; 251 } 252 r = 0; 253 out: 254 free(comment); 255 return r; 256} 257 258/* 259 * Fetch list of identities held by the agent. 260 */ 261int 262ssh_fetch_identitylist(int sock, struct ssh_identitylist **idlp) 263{ 264 u_char type; 265 u_int32_t num, i; 266 struct sshbuf *msg; 267 struct ssh_identitylist *idl = NULL; 268 int r; 269 270 /* 271 * Send a message to the agent requesting for a list of the 272 * identities it can represent. 273 */ 274 if ((msg = sshbuf_new()) == NULL) 275 return SSH_ERR_ALLOC_FAIL; 276 if ((r = sshbuf_put_u8(msg, SSH2_AGENTC_REQUEST_IDENTITIES)) != 0) 277 goto out; 278 279 if ((r = ssh_request_reply(sock, msg, msg)) != 0) 280 goto out; 281 282 /* Get message type, and verify that we got a proper answer. */ 283 if ((r = sshbuf_get_u8(msg, &type)) != 0) 284 goto out; 285 if (agent_failed(type)) { 286 r = SSH_ERR_AGENT_FAILURE; 287 goto out; 288 } else if (type != SSH2_AGENT_IDENTITIES_ANSWER) { 289 r = SSH_ERR_INVALID_FORMAT; 290 goto out; 291 } 292 293 /* Get the number of entries in the response and check it for sanity. */ 294 if ((r = sshbuf_get_u32(msg, &num)) != 0) 295 goto out; 296 if (num > MAX_AGENT_IDENTITIES) { 297 r = SSH_ERR_INVALID_FORMAT; 298 goto out; 299 } 300 if (num == 0) { 301 r = SSH_ERR_AGENT_NO_IDENTITIES; 302 goto out; 303 } 304 305 /* Deserialise the response into a list of keys/comments */ 306 if ((idl = calloc(1, sizeof(*idl))) == NULL || 307 (idl->keys = calloc(num, sizeof(*idl->keys))) == NULL || 308 (idl->comments = calloc(num, sizeof(*idl->comments))) == NULL) { 309 r = SSH_ERR_ALLOC_FAIL; 310 goto out; 311 } 312 for (i = 0; i < num;) { 313 if ((r = deserialise_identity2(msg, &(idl->keys[i]), 314 &(idl->comments[i]))) != 0) { 315 if (r == SSH_ERR_KEY_TYPE_UNKNOWN) { 316 /* Gracefully skip unknown key types */ 317 num--; 318 continue; 319 } else 320 goto out; 321 } 322 i++; 323 } 324 idl->nkeys = num; 325 *idlp = idl; 326 idl = NULL; 327 r = 0; 328 out: 329 sshbuf_free(msg); 330 if (idl != NULL) 331 ssh_free_identitylist(idl); 332 return r; 333} 334 335void 336ssh_free_identitylist(struct ssh_identitylist *idl) 337{ 338 size_t i; 339 340 if (idl == NULL) 341 return; 342 for (i = 0; i < idl->nkeys; i++) { 343 if (idl->keys != NULL) 344 sshkey_free(idl->keys[i]); 345 if (idl->comments != NULL) 346 free(idl->comments[i]); 347 } 348 free(idl->keys); 349 free(idl->comments); 350 free(idl); 351} 352 353/* 354 * Check if the ssh agent has a given key. 355 * Returns 0 if found, or a negative SSH_ERR_* error code on failure. 356 */ 357int 358ssh_agent_has_key(int sock, const struct sshkey *key) 359{ 360 int r, ret = SSH_ERR_KEY_NOT_FOUND; 361 size_t i; 362 struct ssh_identitylist *idlist = NULL; 363 364 if ((r = ssh_fetch_identitylist(sock, &idlist)) != 0) { 365 return r; 366 } 367 368 for (i = 0; i < idlist->nkeys; i++) { 369 if (sshkey_equal_public(idlist->keys[i], key)) { 370 ret = 0; 371 break; 372 } 373 } 374 375 ssh_free_identitylist(idlist); 376 return ret; 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 */ 385 386 387/* encode signature algorithm in flag bits, so we can keep the msg format */ 388static u_int 389agent_encode_alg(const struct sshkey *key, const char *alg) 390{ 391 if (alg != NULL && sshkey_type_plain(key->type) == KEY_RSA) { 392 if (strcmp(alg, "rsa-sha2-256") == 0 || 393 strcmp(alg, "rsa-sha2-256-cert-v01@openssh.com") == 0) 394 return SSH_AGENT_RSA_SHA2_256; 395 if (strcmp(alg, "rsa-sha2-512") == 0 || 396 strcmp(alg, "rsa-sha2-512-cert-v01@openssh.com") == 0) 397 return SSH_AGENT_RSA_SHA2_512; 398 } 399 return 0; 400} 401 402/* ask agent to sign data, returns err.h code on error, 0 on success */ 403int 404ssh_agent_sign(int sock, const struct sshkey *key, 405 u_char **sigp, size_t *lenp, 406 const u_char *data, size_t datalen, const char *alg, u_int compat) 407{ 408 struct sshbuf *msg; 409 u_char *sig = NULL, type = 0; 410 size_t len = 0; 411 u_int flags = 0; 412 int r = SSH_ERR_INTERNAL_ERROR; 413 414 *sigp = NULL; 415 *lenp = 0; 416 417 if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE) 418 return SSH_ERR_INVALID_ARGUMENT; 419 if ((msg = sshbuf_new()) == NULL) 420 return SSH_ERR_ALLOC_FAIL; 421 flags |= agent_encode_alg(key, alg); 422 if ((r = sshbuf_put_u8(msg, SSH2_AGENTC_SIGN_REQUEST)) != 0 || 423 (r = sshkey_puts(key, msg)) != 0 || 424 (r = sshbuf_put_string(msg, data, datalen)) != 0 || 425 (r = sshbuf_put_u32(msg, flags)) != 0) 426 goto out; 427 if ((r = ssh_request_reply(sock, msg, msg)) != 0) 428 goto out; 429 if ((r = sshbuf_get_u8(msg, &type)) != 0) 430 goto out; 431 if (agent_failed(type)) { 432 r = SSH_ERR_AGENT_FAILURE; 433 goto out; 434 } else if (type != SSH2_AGENT_SIGN_RESPONSE) { 435 r = SSH_ERR_INVALID_FORMAT; 436 goto out; 437 } 438 if ((r = sshbuf_get_string(msg, &sig, &len)) != 0) 439 goto out; 440 /* Check what we actually got back from the agent. */ 441 if ((r = sshkey_check_sigtype(sig, len, alg)) != 0) 442 goto out; 443 /* success */ 444 *sigp = sig; 445 *lenp = len; 446 sig = NULL; 447 len = 0; 448 r = 0; 449 out: 450 freezero(sig, len); 451 sshbuf_free(msg); 452 return r; 453} 454 455/* Encode key for a message to the agent. */ 456 457static int 458encode_dest_constraint_hop(struct sshbuf *m, 459 const struct dest_constraint_hop *dch) 460{ 461 struct sshbuf *b; 462 u_int i; 463 int r; 464 465 if ((b = sshbuf_new()) == NULL) 466 return SSH_ERR_ALLOC_FAIL; 467 if ((r = sshbuf_put_cstring(b, dch->user)) != 0 || 468 (r = sshbuf_put_cstring(b, dch->hostname)) != 0 || 469 (r = sshbuf_put_string(b, NULL, 0)) != 0) /* reserved */ 470 goto out; 471 for (i = 0; i < dch->nkeys; i++) { 472 if ((r = sshkey_puts(dch->keys[i], b)) != 0 || 473 (r = sshbuf_put_u8(b, dch->key_is_ca[i] != 0)) != 0) 474 goto out; 475 } 476 if ((r = sshbuf_put_stringb(m, b)) != 0) 477 goto out; 478 /* success */ 479 r = 0; 480 out: 481 sshbuf_free(b); 482 return r; 483} 484 485static int 486encode_dest_constraint(struct sshbuf *m, const struct dest_constraint *dc) 487{ 488 struct sshbuf *b; 489 int r; 490 491 if ((b = sshbuf_new()) == NULL) 492 return SSH_ERR_ALLOC_FAIL; 493 if ((r = encode_dest_constraint_hop(b, &dc->from)) != 0 || 494 (r = encode_dest_constraint_hop(b, &dc->to)) != 0 || 495 (r = sshbuf_put_string(b, NULL, 0)) != 0) /* reserved */ 496 goto out; 497 if ((r = sshbuf_put_stringb(m, b)) != 0) 498 goto out; 499 /* success */ 500 r = 0; 501 out: 502 sshbuf_free(b); 503 return r; 504} 505 506static int 507encode_constraints(struct sshbuf *m, u_int life, u_int confirm, 508 u_int maxsign, const char *provider, 509 struct dest_constraint **dest_constraints, size_t ndest_constraints, 510 int cert_only, struct sshkey **certs, size_t ncerts) 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 sshbuf_free(b); 555 b = NULL; 556 } 557 if (ncerts != 0) { 558 if ((b = sshbuf_new()) == NULL) { 559 r = SSH_ERR_ALLOC_FAIL; 560 goto out; 561 } 562 for (i = 0; i < ncerts; i++) { 563 if ((r = sshkey_puts(certs[i], b)) != 0) 564 goto out; 565 } 566 if ((r = sshbuf_put_u8(m, 567 SSH_AGENT_CONSTRAIN_EXTENSION)) != 0 || 568 (r = sshbuf_put_cstring(m, 569 "associated-certs-v00@openssh.com")) != 0 || 570 (r = sshbuf_put_u8(m, cert_only != 0)) != 0 || 571 (r = sshbuf_put_stringb(m, b)) != 0) 572 goto out; 573 sshbuf_free(b); 574 b = NULL; 575 } 576 r = 0; 577 out: 578 sshbuf_free(b); 579 return r; 580} 581 582/* 583 * Adds an identity to the authentication server. 584 * This call is intended only for use by ssh-add(1) and like applications. 585 */ 586int 587ssh_add_identity_constrained(int sock, struct sshkey *key, 588 const char *comment, u_int life, u_int confirm, u_int maxsign, 589 const char *provider, struct dest_constraint **dest_constraints, 590 size_t ndest_constraints) 591{ 592 struct sshbuf *msg; 593 int r, constrained = (life || confirm || maxsign || 594 provider || dest_constraints); 595 u_char type; 596 597 if ((msg = sshbuf_new()) == NULL) 598 return SSH_ERR_ALLOC_FAIL; 599 600 switch (key->type) { 601#ifdef WITH_OPENSSL 602 case KEY_RSA: 603 case KEY_RSA_CERT: 604 case KEY_DSA: 605 case KEY_DSA_CERT: 606 case KEY_ECDSA: 607 case KEY_ECDSA_CERT: 608 case KEY_ECDSA_SK: 609 case KEY_ECDSA_SK_CERT: 610#endif 611 case KEY_ED25519: 612 case KEY_ED25519_CERT: 613 case KEY_ED25519_SK: 614 case KEY_ED25519_SK_CERT: 615 case KEY_XMSS: 616 case KEY_XMSS_CERT: 617 type = constrained ? 618 SSH2_AGENTC_ADD_ID_CONSTRAINED : 619 SSH2_AGENTC_ADD_IDENTITY; 620 if ((r = sshbuf_put_u8(msg, type)) != 0 || 621 (r = sshkey_private_serialize_maxsign(key, msg, maxsign, 622 0)) != 0 || 623 (r = sshbuf_put_cstring(msg, comment)) != 0) 624 goto out; 625 break; 626 default: 627 r = SSH_ERR_INVALID_ARGUMENT; 628 goto out; 629 } 630 if (constrained && 631 (r = encode_constraints(msg, life, confirm, maxsign, 632 provider, dest_constraints, ndest_constraints, 0, NULL, 0)) != 0) 633 goto out; 634 if ((r = ssh_request_reply_decode(sock, msg)) != 0) 635 goto out; 636 /* success */ 637 r = 0; 638 out: 639 sshbuf_free(msg); 640 return r; 641} 642 643/* 644 * Removes an identity from the authentication server. 645 * This call is intended only for use by ssh-add(1) and like applications. 646 */ 647int 648ssh_remove_identity(int sock, const struct sshkey *key) 649{ 650 struct sshbuf *msg; 651 int r; 652 u_char *blob = NULL; 653 size_t blen; 654 655 if ((msg = sshbuf_new()) == NULL) 656 return SSH_ERR_ALLOC_FAIL; 657 658 if (key->type != KEY_UNSPEC) { 659 if ((r = sshkey_to_blob(key, &blob, &blen)) != 0) 660 goto out; 661 if ((r = sshbuf_put_u8(msg, 662 SSH2_AGENTC_REMOVE_IDENTITY)) != 0 || 663 (r = sshbuf_put_string(msg, blob, blen)) != 0) 664 goto out; 665 } else { 666 r = SSH_ERR_INVALID_ARGUMENT; 667 goto out; 668 } 669 if ((r = ssh_request_reply_decode(sock, msg)) != 0) 670 goto out; 671 /* success */ 672 r = 0; 673 out: 674 if (blob != NULL) 675 freezero(blob, blen); 676 sshbuf_free(msg); 677 return r; 678} 679 680/* 681 * Add/remove an token-based identity from the authentication server. 682 * This call is intended only for use by ssh-add(1) and like applications. 683 */ 684int 685ssh_update_card(int sock, int add, const char *reader_id, const char *pin, 686 u_int life, u_int confirm, 687 struct dest_constraint **dest_constraints, size_t ndest_constraints, 688 int cert_only, struct sshkey **certs, size_t ncerts) 689{ 690 struct sshbuf *msg; 691 int r, constrained = (life || confirm || dest_constraints || certs); 692 u_char type; 693 694 if (add) { 695 type = constrained ? 696 SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED : 697 SSH_AGENTC_ADD_SMARTCARD_KEY; 698 } else 699 type = SSH_AGENTC_REMOVE_SMARTCARD_KEY; 700 701 if ((msg = sshbuf_new()) == NULL) 702 return SSH_ERR_ALLOC_FAIL; 703 if ((r = sshbuf_put_u8(msg, type)) != 0 || 704 (r = sshbuf_put_cstring(msg, reader_id)) != 0 || 705 (r = sshbuf_put_cstring(msg, pin)) != 0) 706 goto out; 707 if (constrained && 708 (r = encode_constraints(msg, life, confirm, 0, NULL, 709 dest_constraints, ndest_constraints, 710 cert_only, certs, ncerts)) != 0) 711 goto out; 712 if ((r = ssh_request_reply_decode(sock, msg)) != 0) 713 goto out; 714 /* success */ 715 r = 0; 716 out: 717 sshbuf_free(msg); 718 return r; 719} 720 721/* 722 * Removes all identities from the agent. 723 * This call is intended only for use by ssh-add(1) and like applications. 724 * 725 * This supports the SSH protocol 1 message to because, when clearing all 726 * keys from an agent, we generally want to clear both protocol v1 and v2 727 * keys. 728 */ 729int 730ssh_remove_all_identities(int sock, int version) 731{ 732 struct sshbuf *msg; 733 u_char type = (version == 1) ? 734 SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES : 735 SSH2_AGENTC_REMOVE_ALL_IDENTITIES; 736 int r; 737 738 if ((msg = sshbuf_new()) == NULL) 739 return SSH_ERR_ALLOC_FAIL; 740 if ((r = sshbuf_put_u8(msg, type)) != 0) 741 goto out; 742 if ((r = ssh_request_reply_decode(sock, msg)) != 0) 743 goto out; 744 /* success */ 745 r = 0; 746 out: 747 sshbuf_free(msg); 748 return r; 749} 750 751/* Binds a session ID to a hostkey via the initial KEX signature. */ 752int 753ssh_agent_bind_hostkey(int sock, const struct sshkey *key, 754 const struct sshbuf *session_id, const struct sshbuf *signature, 755 int forwarding) 756{ 757 struct sshbuf *msg; 758 int r; 759 760 if (key == NULL || session_id == NULL || signature == NULL) 761 return SSH_ERR_INVALID_ARGUMENT; 762 if ((msg = sshbuf_new()) == NULL) 763 return SSH_ERR_ALLOC_FAIL; 764 if ((r = sshbuf_put_u8(msg, SSH_AGENTC_EXTENSION)) != 0 || 765 (r = sshbuf_put_cstring(msg, "session-bind@openssh.com")) != 0 || 766 (r = sshkey_puts(key, msg)) != 0 || 767 (r = sshbuf_put_stringb(msg, session_id)) != 0 || 768 (r = sshbuf_put_stringb(msg, signature)) != 0 || 769 (r = sshbuf_put_u8(msg, forwarding ? 1 : 0)) != 0) 770 goto out; 771 if ((r = ssh_request_reply_decode(sock, msg)) != 0) 772 goto out; 773 /* success */ 774 r = 0; 775 out: 776 sshbuf_free(msg); 777 return r; 778} 779