1 /* $OpenBSD: ssh-pkcs11-client.c,v 1.20 2024/08/15 00:51:51 djm Exp $ */ 2 /* 3 * Copyright (c) 2010 Markus Friedl. All rights reserved. 4 * Copyright (c) 2014 Pedro Martelletto. All rights reserved. 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/types.h> 20 #include <sys/time.h> 21 #include <sys/socket.h> 22 23 #include <stdarg.h> 24 #include <string.h> 25 #include <unistd.h> 26 #include <errno.h> 27 #include <limits.h> 28 29 #include <openssl/ecdsa.h> 30 #include <openssl/rsa.h> 31 32 #include "pathnames.h" 33 #include "xmalloc.h" 34 #include "sshbuf.h" 35 #include "log.h" 36 #include "misc.h" 37 #include "sshkey.h" 38 #include "authfd.h" 39 #include "atomicio.h" 40 #include "ssh-pkcs11.h" 41 #include "ssherr.h" 42 43 /* borrows code from sftp-server and ssh-agent */ 44 45 /* 46 * Maintain a list of ssh-pkcs11-helper subprocesses. These may be looked up 47 * by provider path or their unique EC/RSA METHOD pointers. 48 */ 49 struct helper { 50 char *path; 51 pid_t pid; 52 int fd; 53 RSA_METHOD *rsa_meth; 54 EC_KEY_METHOD *ec_meth; 55 int (*rsa_finish)(RSA *rsa); 56 void (*ec_finish)(EC_KEY *key); 57 size_t nrsa, nec; /* number of active keys of each type */ 58 }; 59 static struct helper **helpers; 60 static size_t nhelpers; 61 62 static struct helper * 63 helper_by_provider(const char *path) 64 { 65 size_t i; 66 67 for (i = 0; i < nhelpers; i++) { 68 if (helpers[i] == NULL || helpers[i]->path == NULL || 69 helpers[i]->fd == -1) 70 continue; 71 if (strcmp(helpers[i]->path, path) == 0) 72 return helpers[i]; 73 } 74 return NULL; 75 } 76 77 static struct helper * 78 helper_by_rsa(const RSA *rsa) 79 { 80 size_t i; 81 const RSA_METHOD *meth; 82 83 if ((meth = RSA_get_method(rsa)) == NULL) 84 return NULL; 85 for (i = 0; i < nhelpers; i++) { 86 if (helpers[i] != NULL && helpers[i]->rsa_meth == meth) 87 return helpers[i]; 88 } 89 return NULL; 90 91 } 92 93 static struct helper * 94 helper_by_ec(const EC_KEY *ec) 95 { 96 size_t i; 97 const EC_KEY_METHOD *meth; 98 99 if ((meth = EC_KEY_get_method(ec)) == NULL) 100 return NULL; 101 for (i = 0; i < nhelpers; i++) { 102 if (helpers[i] != NULL && helpers[i]->ec_meth == meth) 103 return helpers[i]; 104 } 105 return NULL; 106 107 } 108 109 static void 110 helper_free(struct helper *helper) 111 { 112 size_t i; 113 int found = 0; 114 115 if (helper == NULL) 116 return; 117 if (helper->path == NULL || helper->ec_meth == NULL || 118 helper->rsa_meth == NULL) 119 fatal_f("inconsistent helper"); 120 debug3_f("free helper for provider %s", helper->path); 121 for (i = 0; i < nhelpers; i++) { 122 if (helpers[i] == helper) { 123 if (found) 124 fatal_f("helper recorded more than once"); 125 found = 1; 126 } 127 else if (found) 128 helpers[i - 1] = helpers[i]; 129 } 130 if (found) { 131 helpers = xrecallocarray(helpers, nhelpers, 132 nhelpers - 1, sizeof(*helpers)); 133 nhelpers--; 134 } 135 free(helper->path); 136 EC_KEY_METHOD_free(helper->ec_meth); 137 RSA_meth_free(helper->rsa_meth); 138 free(helper); 139 } 140 141 static void 142 helper_terminate(struct helper *helper) 143 { 144 if (helper == NULL) { 145 return; 146 } else if (helper->fd == -1) { 147 debug3_f("already terminated"); 148 } else { 149 debug3_f("terminating helper for %s; " 150 "remaining %zu RSA %zu ECDSA", 151 helper->path, helper->nrsa, helper->nec); 152 close(helper->fd); 153 /* XXX waitpid() */ 154 helper->fd = -1; 155 helper->pid = -1; 156 } 157 /* 158 * Don't delete the helper entry until there are no remaining keys 159 * that reference it. Otherwise, any signing operation would call 160 * a free'd METHOD pointer and that would be bad. 161 */ 162 if (helper->nrsa == 0 && helper->nec == 0) 163 helper_free(helper); 164 } 165 166 static void 167 send_msg(int fd, struct sshbuf *m) 168 { 169 u_char buf[4]; 170 size_t mlen = sshbuf_len(m); 171 int r; 172 173 if (fd == -1) 174 return; 175 POKE_U32(buf, mlen); 176 if (atomicio(vwrite, fd, buf, 4) != 4 || 177 atomicio(vwrite, fd, sshbuf_mutable_ptr(m), 178 sshbuf_len(m)) != sshbuf_len(m)) 179 error("write to helper failed"); 180 if ((r = sshbuf_consume(m, mlen)) != 0) 181 fatal_fr(r, "consume"); 182 } 183 184 static int 185 recv_msg(int fd, struct sshbuf *m) 186 { 187 u_int l, len; 188 u_char c, buf[1024]; 189 int r; 190 191 sshbuf_reset(m); 192 if (fd == -1) 193 return 0; /* XXX */ 194 if ((len = atomicio(read, fd, buf, 4)) != 4) { 195 error("read from helper failed: %u", len); 196 return (0); /* XXX */ 197 } 198 len = PEEK_U32(buf); 199 if (len > 256 * 1024) 200 fatal("response too long: %u", len); 201 /* read len bytes into m */ 202 while (len > 0) { 203 l = len; 204 if (l > sizeof(buf)) 205 l = sizeof(buf); 206 if (atomicio(read, fd, buf, l) != l) { 207 error("response from helper failed."); 208 return (0); /* XXX */ 209 } 210 if ((r = sshbuf_put(m, buf, l)) != 0) 211 fatal_fr(r, "sshbuf_put"); 212 len -= l; 213 } 214 if ((r = sshbuf_get_u8(m, &c)) != 0) 215 fatal_fr(r, "parse type"); 216 return c; 217 } 218 219 int 220 pkcs11_init(int interactive) 221 { 222 return 0; 223 } 224 225 void 226 pkcs11_terminate(void) 227 { 228 size_t i; 229 230 debug3_f("terminating %zu helpers", nhelpers); 231 for (i = 0; i < nhelpers; i++) 232 helper_terminate(helpers[i]); 233 } 234 235 static int 236 rsa_encrypt(int flen, const u_char *from, u_char *to, RSA *rsa, int padding) 237 { 238 struct sshkey *key = NULL; 239 struct sshbuf *msg = NULL; 240 u_char *blob = NULL, *signature = NULL; 241 size_t blen, slen = 0; 242 int r, ret = -1; 243 struct helper *helper; 244 245 if ((helper = helper_by_rsa(rsa)) == NULL || helper->fd == -1) 246 fatal_f("no helper for PKCS11 key"); 247 debug3_f("signing with PKCS11 provider %s", helper->path); 248 if (padding != RSA_PKCS1_PADDING) 249 goto fail; 250 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) { 251 error_f("sshkey_new failed"); 252 goto fail; 253 } 254 if ((key->pkey = EVP_PKEY_new()) == NULL || 255 EVP_PKEY_set1_RSA(key->pkey, rsa) != 1) { 256 error_f("pkey setup failed"); 257 goto fail; 258 } 259 260 key->type = KEY_RSA; 261 if ((r = sshkey_to_blob(key, &blob, &blen)) != 0) { 262 error_fr(r, "encode key"); 263 goto fail; 264 } 265 if ((msg = sshbuf_new()) == NULL) 266 fatal_f("sshbuf_new failed"); 267 if ((r = sshbuf_put_u8(msg, SSH2_AGENTC_SIGN_REQUEST)) != 0 || 268 (r = sshbuf_put_string(msg, blob, blen)) != 0 || 269 (r = sshbuf_put_string(msg, from, flen)) != 0 || 270 (r = sshbuf_put_u32(msg, 0)) != 0) 271 fatal_fr(r, "compose"); 272 send_msg(helper->fd, msg); 273 sshbuf_reset(msg); 274 275 if (recv_msg(helper->fd, msg) == SSH2_AGENT_SIGN_RESPONSE) { 276 if ((r = sshbuf_get_string(msg, &signature, &slen)) != 0) 277 fatal_fr(r, "parse"); 278 if (slen <= (size_t)RSA_size(rsa)) { 279 memcpy(to, signature, slen); 280 ret = slen; 281 } 282 free(signature); 283 } 284 fail: 285 free(blob); 286 sshkey_free(key); 287 sshbuf_free(msg); 288 return (ret); 289 } 290 291 static int 292 rsa_finish(RSA *rsa) 293 { 294 struct helper *helper; 295 296 if ((helper = helper_by_rsa(rsa)) == NULL) 297 fatal_f("no helper for PKCS11 key"); 298 debug3_f("free PKCS11 RSA key for provider %s", helper->path); 299 if (helper->rsa_finish != NULL) 300 helper->rsa_finish(rsa); 301 if (helper->nrsa == 0) 302 fatal_f("RSA refcount error"); 303 helper->nrsa--; 304 debug3_f("provider %s remaining keys: %zu RSA %zu ECDSA", 305 helper->path, helper->nrsa, helper->nec); 306 if (helper->nrsa == 0 && helper->nec == 0) 307 helper_terminate(helper); 308 return 1; 309 } 310 311 static ECDSA_SIG * 312 ecdsa_do_sign(const unsigned char *dgst, int dgst_len, const BIGNUM *inv, 313 const BIGNUM *rp, EC_KEY *ec) 314 { 315 struct sshkey *key = NULL; 316 struct sshbuf *msg = NULL; 317 ECDSA_SIG *ret = NULL; 318 const u_char *cp; 319 u_char *blob = NULL, *signature = NULL; 320 size_t blen, slen = 0; 321 int r, nid; 322 struct helper *helper; 323 324 if ((helper = helper_by_ec(ec)) == NULL || helper->fd == -1) 325 fatal_f("no helper for PKCS11 key"); 326 debug3_f("signing with PKCS11 provider %s", helper->path); 327 328 if ((key = sshkey_new(KEY_UNSPEC)) == NULL) { 329 error_f("sshkey_new failed"); 330 goto fail; 331 } 332 if ((key->pkey = EVP_PKEY_new()) == NULL || 333 EVP_PKEY_set1_EC_KEY(key->pkey, ec) != 1) { 334 error("pkey setup failed"); 335 goto fail; 336 } 337 if ((nid = sshkey_ecdsa_pkey_to_nid(key->pkey)) < 0) { 338 error("couldn't get curve nid"); 339 goto fail; 340 } 341 key->ecdsa_nid = nid; 342 key->type = KEY_ECDSA; 343 344 if ((r = sshkey_to_blob(key, &blob, &blen)) != 0) { 345 error_fr(r, "encode key"); 346 goto fail; 347 } 348 if ((msg = sshbuf_new()) == NULL) 349 fatal_f("sshbuf_new failed"); 350 if ((r = sshbuf_put_u8(msg, SSH2_AGENTC_SIGN_REQUEST)) != 0 || 351 (r = sshbuf_put_string(msg, blob, blen)) != 0 || 352 (r = sshbuf_put_string(msg, dgst, dgst_len)) != 0 || 353 (r = sshbuf_put_u32(msg, 0)) != 0) 354 fatal_fr(r, "compose"); 355 send_msg(helper->fd, msg); 356 sshbuf_reset(msg); 357 358 if (recv_msg(helper->fd, msg) == SSH2_AGENT_SIGN_RESPONSE) { 359 if ((r = sshbuf_get_string(msg, &signature, &slen)) != 0) 360 fatal_fr(r, "parse"); 361 cp = signature; 362 ret = d2i_ECDSA_SIG(NULL, &cp, slen); 363 free(signature); 364 } 365 366 fail: 367 free(blob); 368 sshkey_free(key); 369 sshbuf_free(msg); 370 return (ret); 371 } 372 373 static void 374 ecdsa_do_finish(EC_KEY *ec) 375 { 376 struct helper *helper; 377 378 if ((helper = helper_by_ec(ec)) == NULL) 379 fatal_f("no helper for PKCS11 key"); 380 debug3_f("free PKCS11 ECDSA key for provider %s", helper->path); 381 if (helper->ec_finish != NULL) 382 helper->ec_finish(ec); 383 if (helper->nec == 0) 384 fatal_f("ECDSA refcount error"); 385 helper->nec--; 386 debug3_f("provider %s remaining keys: %zu RSA %zu ECDSA", 387 helper->path, helper->nrsa, helper->nec); 388 if (helper->nrsa == 0 && helper->nec == 0) 389 helper_terminate(helper); 390 } 391 392 /* redirect private key crypto operations to the ssh-pkcs11-helper */ 393 static void 394 wrap_key(struct helper *helper, struct sshkey *k) 395 { 396 RSA *rsa = NULL; 397 EC_KEY *ecdsa = NULL; 398 399 debug3_f("wrap %s for provider %s", sshkey_type(k), helper->path); 400 if (k->type == KEY_RSA) { 401 if ((rsa = EVP_PKEY_get1_RSA(k->pkey)) == NULL) 402 fatal_f("no RSA key"); 403 if (RSA_set_method(rsa, helper->rsa_meth) != 1) 404 fatal_f("RSA_set_method failed"); 405 if (helper->nrsa++ >= INT_MAX) 406 fatal_f("RSA refcount error"); 407 if (EVP_PKEY_set1_RSA(k->pkey, rsa) != 1) 408 fatal_f("EVP_PKEY_set1_RSA failed"); 409 RSA_free(rsa); 410 } else if (k->type == KEY_ECDSA) { 411 if ((ecdsa = EVP_PKEY_get1_EC_KEY(k->pkey)) == NULL) 412 fatal_f("no ECDSA key"); 413 if (EC_KEY_set_method(ecdsa, helper->ec_meth) != 1) 414 fatal_f("EC_KEY_set_method failed"); 415 if (helper->nec++ >= INT_MAX) 416 fatal_f("EC refcount error"); 417 if (EVP_PKEY_set1_EC_KEY(k->pkey, ecdsa) != 1) 418 fatal_f("EVP_PKEY_set1_EC_KEY failed"); 419 EC_KEY_free(ecdsa); 420 } else 421 fatal_f("unknown key type"); 422 k->flags |= SSHKEY_FLAG_EXT; 423 debug3_f("provider %s remaining keys: %zu RSA %zu ECDSA", 424 helper->path, helper->nrsa, helper->nec); 425 } 426 427 /* 428 * Make a private PKCS#11-backed certificate by grafting a previously-loaded 429 * PKCS#11 private key and a public certificate key. 430 */ 431 int 432 pkcs11_make_cert(const struct sshkey *priv, 433 const struct sshkey *certpub, struct sshkey **certprivp) 434 { 435 struct helper *helper = NULL; 436 struct sshkey *ret; 437 int r; 438 RSA *rsa_priv = NULL, *rsa_cert = NULL; 439 EC_KEY *ec_priv = NULL, *ec_cert = NULL; 440 441 debug3_f("private key type %s cert type %s", sshkey_type(priv), 442 sshkey_type(certpub)); 443 *certprivp = NULL; 444 if (!sshkey_is_cert(certpub) || sshkey_is_cert(priv) || 445 !sshkey_equal_public(priv, certpub)) { 446 error_f("private key %s doesn't match cert %s", 447 sshkey_type(priv), sshkey_type(certpub)); 448 return SSH_ERR_INVALID_ARGUMENT; 449 } 450 *certprivp = NULL; 451 if (priv->type == KEY_RSA) { 452 if ((rsa_priv = EVP_PKEY_get1_RSA(priv->pkey)) == NULL) 453 fatal_f("no RSA pkey"); 454 if ((helper = helper_by_rsa(rsa_priv)) == NULL || 455 helper->fd == -1) 456 fatal_f("no helper for PKCS11 RSA key"); 457 if ((r = sshkey_from_private(priv, &ret)) != 0) 458 fatal_fr(r, "copy key"); 459 if ((rsa_cert = EVP_PKEY_get1_RSA(ret->pkey)) == NULL) 460 fatal_f("no RSA cert pkey"); 461 if (RSA_set_method(rsa_cert, helper->rsa_meth) != 1) 462 fatal_f("RSA_set_method failed"); 463 if (helper->nrsa++ >= INT_MAX) 464 fatal_f("RSA refcount error"); 465 if (EVP_PKEY_set1_RSA(ret->pkey, rsa_cert) != 1) 466 fatal_f("EVP_PKEY_set1_RSA failed"); 467 RSA_free(rsa_priv); 468 RSA_free(rsa_cert); 469 } else if (priv->type == KEY_ECDSA) { 470 if ((ec_priv = EVP_PKEY_get1_EC_KEY(priv->pkey)) == NULL) 471 fatal_f("no EC pkey"); 472 if ((helper = helper_by_ec(ec_priv)) == NULL || 473 helper->fd == -1) 474 fatal_f("no helper for PKCS11 EC key"); 475 if ((r = sshkey_from_private(priv, &ret)) != 0) 476 fatal_fr(r, "copy key"); 477 if ((ec_cert = EVP_PKEY_get1_EC_KEY(ret->pkey)) == NULL) 478 fatal_f("no EC cert pkey"); 479 if (EC_KEY_set_method(ec_cert, helper->ec_meth) != 1) 480 fatal_f("EC_KEY_set_method failed"); 481 if (helper->nec++ >= INT_MAX) 482 fatal_f("EC refcount error"); 483 if (EVP_PKEY_set1_EC_KEY(ret->pkey, ec_cert) != 1) 484 fatal_f("EVP_PKEY_set1_EC_KEY failed"); 485 EC_KEY_free(ec_priv); 486 EC_KEY_free(ec_cert); 487 } else 488 fatal_f("unknown key type %s", sshkey_type(priv)); 489 490 ret->flags |= SSHKEY_FLAG_EXT; 491 if ((r = sshkey_to_certified(ret)) != 0 || 492 (r = sshkey_cert_copy(certpub, ret)) != 0) 493 fatal_fr(r, "graft certificate"); 494 debug3_f("provider %s remaining keys: %zu RSA %zu ECDSA", 495 helper->path, helper->nrsa, helper->nec); 496 /* success */ 497 *certprivp = ret; 498 return 0; 499 } 500 501 static int 502 pkcs11_start_helper_methods(struct helper *helper) 503 { 504 int (*ec_init)(EC_KEY *key); 505 int (*ec_copy)(EC_KEY *dest, const EC_KEY *src); 506 int (*ec_set_group)(EC_KEY *key, const EC_GROUP *grp); 507 int (*ec_set_private)(EC_KEY *key, const BIGNUM *priv_key); 508 int (*ec_set_public)(EC_KEY *key, const EC_POINT *pub_key); 509 int (*ec_sign)(int, const unsigned char *, int, unsigned char *, 510 unsigned int *, const BIGNUM *, const BIGNUM *, EC_KEY *) = NULL; 511 RSA_METHOD *rsa_meth; 512 EC_KEY_METHOD *ec_meth; 513 514 if ((ec_meth = EC_KEY_METHOD_new(EC_KEY_OpenSSL())) == NULL) 515 return -1; 516 EC_KEY_METHOD_get_sign(ec_meth, &ec_sign, NULL, NULL); 517 EC_KEY_METHOD_set_sign(ec_meth, ec_sign, NULL, ecdsa_do_sign); 518 EC_KEY_METHOD_get_init(ec_meth, &ec_init, &helper->ec_finish, 519 &ec_copy, &ec_set_group, &ec_set_private, &ec_set_public); 520 EC_KEY_METHOD_set_init(ec_meth, ec_init, ecdsa_do_finish, 521 ec_copy, ec_set_group, ec_set_private, ec_set_public); 522 523 if ((rsa_meth = RSA_meth_dup(RSA_get_default_method())) == NULL) 524 fatal_f("RSA_meth_dup failed"); 525 helper->rsa_finish = RSA_meth_get_finish(rsa_meth); 526 if (!RSA_meth_set1_name(rsa_meth, "ssh-pkcs11-helper") || 527 !RSA_meth_set_priv_enc(rsa_meth, rsa_encrypt) || 528 !RSA_meth_set_finish(rsa_meth, rsa_finish)) 529 fatal_f("failed to prepare method"); 530 531 helper->ec_meth = ec_meth; 532 helper->rsa_meth = rsa_meth; 533 return 0; 534 } 535 536 static struct helper * 537 pkcs11_start_helper(const char *path) 538 { 539 int pair[2]; 540 char *prog, *verbosity = NULL; 541 struct helper *helper; 542 pid_t pid; 543 544 if (nhelpers >= INT_MAX) 545 fatal_f("too many helpers"); 546 debug3_f("start helper for %s", path); 547 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) { 548 error_f("socketpair: %s", strerror(errno)); 549 return NULL; 550 } 551 helper = xcalloc(1, sizeof(*helper)); 552 if (pkcs11_start_helper_methods(helper) == -1) { 553 error_f("pkcs11_start_helper_methods failed"); 554 goto fail; 555 } 556 if ((pid = fork()) == -1) { 557 error_f("fork: %s", strerror(errno)); 558 fail: 559 close(pair[0]); 560 close(pair[1]); 561 RSA_meth_free(helper->rsa_meth); 562 EC_KEY_METHOD_free(helper->ec_meth); 563 free(helper); 564 return NULL; 565 } else if (pid == 0) { 566 if ((dup2(pair[1], STDIN_FILENO) == -1) || 567 (dup2(pair[1], STDOUT_FILENO) == -1)) { 568 fprintf(stderr, "dup2: %s\n", strerror(errno)); 569 _exit(1); 570 } 571 close(pair[0]); 572 close(pair[1]); 573 prog = getenv("SSH_PKCS11_HELPER"); 574 if (prog == NULL || strlen(prog) == 0) 575 prog = _PATH_SSH_PKCS11_HELPER; 576 if (log_level_get() >= SYSLOG_LEVEL_DEBUG1) 577 verbosity = "-vvv"; 578 debug_f("starting %s %s", prog, 579 verbosity == NULL ? "" : verbosity); 580 execlp(prog, prog, verbosity, (char *)NULL); 581 fprintf(stderr, "exec: %s: %s\n", prog, strerror(errno)); 582 _exit(1); 583 } 584 close(pair[1]); 585 helper->fd = pair[0]; 586 helper->path = xstrdup(path); 587 helper->pid = pid; 588 debug3_f("helper %zu for \"%s\" on fd %d pid %ld", nhelpers, 589 helper->path, helper->fd, (long)helper->pid); 590 helpers = xrecallocarray(helpers, nhelpers, 591 nhelpers + 1, sizeof(*helpers)); 592 helpers[nhelpers++] = helper; 593 return helper; 594 } 595 596 int 597 pkcs11_add_provider(char *name, char *pin, struct sshkey ***keysp, 598 char ***labelsp) 599 { 600 struct sshkey *k; 601 int r, type; 602 u_char *blob; 603 char *label; 604 size_t blen; 605 u_int nkeys, i; 606 struct sshbuf *msg; 607 struct helper *helper; 608 609 if ((helper = helper_by_provider(name)) == NULL && 610 (helper = pkcs11_start_helper(name)) == NULL) 611 return -1; 612 613 if ((msg = sshbuf_new()) == NULL) 614 fatal_f("sshbuf_new failed"); 615 if ((r = sshbuf_put_u8(msg, SSH_AGENTC_ADD_SMARTCARD_KEY)) != 0 || 616 (r = sshbuf_put_cstring(msg, name)) != 0 || 617 (r = sshbuf_put_cstring(msg, pin)) != 0) 618 fatal_fr(r, "compose"); 619 send_msg(helper->fd, msg); 620 sshbuf_reset(msg); 621 622 type = recv_msg(helper->fd, msg); 623 if (type == SSH2_AGENT_IDENTITIES_ANSWER) { 624 if ((r = sshbuf_get_u32(msg, &nkeys)) != 0) 625 fatal_fr(r, "parse nkeys"); 626 *keysp = xcalloc(nkeys, sizeof(struct sshkey *)); 627 if (labelsp) 628 *labelsp = xcalloc(nkeys, sizeof(char *)); 629 for (i = 0; i < nkeys; i++) { 630 /* XXX clean up properly instead of fatal() */ 631 if ((r = sshbuf_get_string(msg, &blob, &blen)) != 0 || 632 (r = sshbuf_get_cstring(msg, &label, NULL)) != 0) 633 fatal_fr(r, "parse key"); 634 if ((r = sshkey_from_blob(blob, blen, &k)) != 0) 635 fatal_fr(r, "decode key"); 636 wrap_key(helper, k); 637 (*keysp)[i] = k; 638 if (labelsp) 639 (*labelsp)[i] = label; 640 else 641 free(label); 642 free(blob); 643 } 644 } else if (type == SSH2_AGENT_FAILURE) { 645 if ((r = sshbuf_get_u32(msg, &nkeys)) != 0) 646 nkeys = -1; 647 } else { 648 nkeys = -1; 649 } 650 sshbuf_free(msg); 651 return (nkeys); 652 } 653 654 int 655 pkcs11_del_provider(char *name) 656 { 657 struct helper *helper; 658 659 /* 660 * ssh-agent deletes keys before calling this, so the helper entry 661 * should be gone before we get here. 662 */ 663 debug3_f("delete %s", name); 664 if ((helper = helper_by_provider(name)) != NULL) 665 helper_terminate(helper); 666 return 0; 667 } 668