1 // SPDX-License-Identifier: BSD-3-Clause 2 /* 3 * linux/net/sunrpc/gss_krb5_mech.c 4 * 5 * Copyright (c) 2001-2008 The Regents of the University of Michigan. 6 * All rights reserved. 7 * 8 * Andy Adamson <andros@umich.edu> 9 * J. Bruce Fields <bfields@umich.edu> 10 */ 11 12 #include <crypto/hash.h> 13 #include <crypto/skcipher.h> 14 #include <linux/err.h> 15 #include <linux/module.h> 16 #include <linux/init.h> 17 #include <linux/types.h> 18 #include <linux/slab.h> 19 #include <linux/sunrpc/auth.h> 20 #include <linux/sunrpc/gss_krb5.h> 21 #include <linux/sunrpc/xdr.h> 22 #include <kunit/visibility.h> 23 24 #include "auth_gss_internal.h" 25 #include "gss_krb5_internal.h" 26 27 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 28 # define RPCDBG_FACILITY RPCDBG_AUTH 29 #endif 30 31 static struct gss_api_mech gss_kerberos_mech; 32 33 static const struct gss_krb5_enctype supported_gss_krb5_enctypes[] = { 34 #if defined(CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_AES_SHA1) 35 /* 36 * AES-128 with SHA-1 (RFC 3962) 37 */ 38 { 39 .etype = ENCTYPE_AES128_CTS_HMAC_SHA1_96, 40 .ctype = CKSUMTYPE_HMAC_SHA1_96_AES128, 41 .name = "aes128-cts", 42 .encrypt_name = "cts(cbc(aes))", 43 .aux_cipher = "cbc(aes)", 44 .cksum_name = "hmac(sha1)", 45 .derive_key = krb5_derive_key_v2, 46 .encrypt = gss_krb5_aes_encrypt, 47 .decrypt = gss_krb5_aes_decrypt, 48 49 .get_mic = gss_krb5_get_mic_v2, 50 .verify_mic = gss_krb5_verify_mic_v2, 51 .wrap = gss_krb5_wrap_v2, 52 .unwrap = gss_krb5_unwrap_v2, 53 54 .signalg = -1, 55 .sealalg = -1, 56 .keybytes = 16, 57 .keylength = BITS2OCTETS(128), 58 .Kc_length = BITS2OCTETS(128), 59 .Ke_length = BITS2OCTETS(128), 60 .Ki_length = BITS2OCTETS(128), 61 .cksumlength = BITS2OCTETS(96), 62 .keyed_cksum = 1, 63 }, 64 /* 65 * AES-256 with SHA-1 (RFC 3962) 66 */ 67 { 68 .etype = ENCTYPE_AES256_CTS_HMAC_SHA1_96, 69 .ctype = CKSUMTYPE_HMAC_SHA1_96_AES256, 70 .name = "aes256-cts", 71 .encrypt_name = "cts(cbc(aes))", 72 .aux_cipher = "cbc(aes)", 73 .cksum_name = "hmac(sha1)", 74 .derive_key = krb5_derive_key_v2, 75 .encrypt = gss_krb5_aes_encrypt, 76 .decrypt = gss_krb5_aes_decrypt, 77 78 .get_mic = gss_krb5_get_mic_v2, 79 .verify_mic = gss_krb5_verify_mic_v2, 80 .wrap = gss_krb5_wrap_v2, 81 .unwrap = gss_krb5_unwrap_v2, 82 83 .signalg = -1, 84 .sealalg = -1, 85 .keybytes = 32, 86 .keylength = BITS2OCTETS(256), 87 .Kc_length = BITS2OCTETS(256), 88 .Ke_length = BITS2OCTETS(256), 89 .Ki_length = BITS2OCTETS(256), 90 .cksumlength = BITS2OCTETS(96), 91 .keyed_cksum = 1, 92 }, 93 #endif 94 95 #if defined(CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_CAMELLIA) 96 /* 97 * Camellia-128 with CMAC (RFC 6803) 98 */ 99 { 100 .etype = ENCTYPE_CAMELLIA128_CTS_CMAC, 101 .ctype = CKSUMTYPE_CMAC_CAMELLIA128, 102 .name = "camellia128-cts-cmac", 103 .encrypt_name = "cts(cbc(camellia))", 104 .aux_cipher = "cbc(camellia)", 105 .cksum_name = "cmac(camellia)", 106 .cksumlength = BITS2OCTETS(128), 107 .keyed_cksum = 1, 108 .keylength = BITS2OCTETS(128), 109 .Kc_length = BITS2OCTETS(128), 110 .Ke_length = BITS2OCTETS(128), 111 .Ki_length = BITS2OCTETS(128), 112 113 .derive_key = krb5_kdf_feedback_cmac, 114 .encrypt = gss_krb5_aes_encrypt, 115 .decrypt = gss_krb5_aes_decrypt, 116 117 .get_mic = gss_krb5_get_mic_v2, 118 .verify_mic = gss_krb5_verify_mic_v2, 119 .wrap = gss_krb5_wrap_v2, 120 .unwrap = gss_krb5_unwrap_v2, 121 }, 122 /* 123 * Camellia-256 with CMAC (RFC 6803) 124 */ 125 { 126 .etype = ENCTYPE_CAMELLIA256_CTS_CMAC, 127 .ctype = CKSUMTYPE_CMAC_CAMELLIA256, 128 .name = "camellia256-cts-cmac", 129 .encrypt_name = "cts(cbc(camellia))", 130 .aux_cipher = "cbc(camellia)", 131 .cksum_name = "cmac(camellia)", 132 .cksumlength = BITS2OCTETS(128), 133 .keyed_cksum = 1, 134 .keylength = BITS2OCTETS(256), 135 .Kc_length = BITS2OCTETS(256), 136 .Ke_length = BITS2OCTETS(256), 137 .Ki_length = BITS2OCTETS(256), 138 139 .derive_key = krb5_kdf_feedback_cmac, 140 .encrypt = gss_krb5_aes_encrypt, 141 .decrypt = gss_krb5_aes_decrypt, 142 143 .get_mic = gss_krb5_get_mic_v2, 144 .verify_mic = gss_krb5_verify_mic_v2, 145 .wrap = gss_krb5_wrap_v2, 146 .unwrap = gss_krb5_unwrap_v2, 147 }, 148 #endif 149 150 #if defined(CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_AES_SHA2) 151 /* 152 * AES-128 with SHA-256 (RFC 8009) 153 */ 154 { 155 .etype = ENCTYPE_AES128_CTS_HMAC_SHA256_128, 156 .ctype = CKSUMTYPE_HMAC_SHA256_128_AES128, 157 .name = "aes128-cts-hmac-sha256-128", 158 .encrypt_name = "cts(cbc(aes))", 159 .aux_cipher = "cbc(aes)", 160 .cksum_name = "hmac(sha256)", 161 .cksumlength = BITS2OCTETS(128), 162 .keyed_cksum = 1, 163 .keylength = BITS2OCTETS(128), 164 .Kc_length = BITS2OCTETS(128), 165 .Ke_length = BITS2OCTETS(128), 166 .Ki_length = BITS2OCTETS(128), 167 168 .derive_key = krb5_kdf_hmac_sha2, 169 .encrypt = krb5_etm_encrypt, 170 .decrypt = krb5_etm_decrypt, 171 172 .get_mic = gss_krb5_get_mic_v2, 173 .verify_mic = gss_krb5_verify_mic_v2, 174 .wrap = gss_krb5_wrap_v2, 175 .unwrap = gss_krb5_unwrap_v2, 176 }, 177 /* 178 * AES-256 with SHA-384 (RFC 8009) 179 */ 180 { 181 .etype = ENCTYPE_AES256_CTS_HMAC_SHA384_192, 182 .ctype = CKSUMTYPE_HMAC_SHA384_192_AES256, 183 .name = "aes256-cts-hmac-sha384-192", 184 .encrypt_name = "cts(cbc(aes))", 185 .aux_cipher = "cbc(aes)", 186 .cksum_name = "hmac(sha384)", 187 .cksumlength = BITS2OCTETS(192), 188 .keyed_cksum = 1, 189 .keylength = BITS2OCTETS(256), 190 .Kc_length = BITS2OCTETS(192), 191 .Ke_length = BITS2OCTETS(256), 192 .Ki_length = BITS2OCTETS(192), 193 194 .derive_key = krb5_kdf_hmac_sha2, 195 .encrypt = krb5_etm_encrypt, 196 .decrypt = krb5_etm_decrypt, 197 198 .get_mic = gss_krb5_get_mic_v2, 199 .verify_mic = gss_krb5_verify_mic_v2, 200 .wrap = gss_krb5_wrap_v2, 201 .unwrap = gss_krb5_unwrap_v2, 202 }, 203 #endif 204 }; 205 206 /* 207 * The list of advertised enctypes is specified in order of most 208 * preferred to least. 209 */ 210 static char gss_krb5_enctype_priority_list[64]; 211 212 static void gss_krb5_prepare_enctype_priority_list(void) 213 { 214 static const u32 gss_krb5_enctypes[] = { 215 #if defined(CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_AES_SHA2) 216 ENCTYPE_AES256_CTS_HMAC_SHA384_192, 217 ENCTYPE_AES128_CTS_HMAC_SHA256_128, 218 #endif 219 #if defined(CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_CAMELLIA) 220 ENCTYPE_CAMELLIA256_CTS_CMAC, 221 ENCTYPE_CAMELLIA128_CTS_CMAC, 222 #endif 223 #if defined(CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_AES_SHA1) 224 ENCTYPE_AES256_CTS_HMAC_SHA1_96, 225 ENCTYPE_AES128_CTS_HMAC_SHA1_96, 226 #endif 227 }; 228 size_t total, i; 229 char buf[16]; 230 char *sep; 231 int n; 232 233 sep = ""; 234 gss_krb5_enctype_priority_list[0] = '\0'; 235 for (total = 0, i = 0; i < ARRAY_SIZE(gss_krb5_enctypes); i++) { 236 n = sprintf(buf, "%s%u", sep, gss_krb5_enctypes[i]); 237 if (n < 0) 238 break; 239 if (total + n >= sizeof(gss_krb5_enctype_priority_list)) 240 break; 241 strcat(gss_krb5_enctype_priority_list, buf); 242 sep = ","; 243 total += n; 244 } 245 } 246 247 /** 248 * gss_krb5_lookup_enctype - Retrieve profile information for a given enctype 249 * @etype: ENCTYPE value 250 * 251 * Returns a pointer to a gss_krb5_enctype structure, or NULL if no 252 * matching etype is found. 253 */ 254 VISIBLE_IF_KUNIT 255 const struct gss_krb5_enctype *gss_krb5_lookup_enctype(u32 etype) 256 { 257 size_t i; 258 259 for (i = 0; i < ARRAY_SIZE(supported_gss_krb5_enctypes); i++) 260 if (supported_gss_krb5_enctypes[i].etype == etype) 261 return &supported_gss_krb5_enctypes[i]; 262 return NULL; 263 } 264 EXPORT_SYMBOL_IF_KUNIT(gss_krb5_lookup_enctype); 265 266 static struct crypto_sync_skcipher * 267 gss_krb5_alloc_cipher_v2(const char *cname, const struct xdr_netobj *key) 268 { 269 struct crypto_sync_skcipher *tfm; 270 271 tfm = crypto_alloc_sync_skcipher(cname, 0, 0); 272 if (IS_ERR(tfm)) 273 return NULL; 274 if (crypto_sync_skcipher_setkey(tfm, key->data, key->len)) { 275 crypto_free_sync_skcipher(tfm); 276 return NULL; 277 } 278 return tfm; 279 } 280 281 static struct crypto_ahash * 282 gss_krb5_alloc_hash_v2(struct krb5_ctx *kctx, const struct xdr_netobj *key) 283 { 284 struct crypto_ahash *tfm; 285 286 tfm = crypto_alloc_ahash(kctx->gk5e->cksum_name, 0, CRYPTO_ALG_ASYNC); 287 if (IS_ERR(tfm)) 288 return NULL; 289 if (crypto_ahash_setkey(tfm, key->data, key->len)) { 290 crypto_free_ahash(tfm); 291 return NULL; 292 } 293 return tfm; 294 } 295 296 static int 297 gss_krb5_import_ctx_v2(struct krb5_ctx *ctx, gfp_t gfp_mask) 298 { 299 struct xdr_netobj keyin = { 300 .len = ctx->gk5e->keylength, 301 .data = ctx->Ksess, 302 }; 303 struct xdr_netobj keyout; 304 int ret = -EINVAL; 305 306 keyout.data = kmalloc(GSS_KRB5_MAX_KEYLEN, gfp_mask); 307 if (!keyout.data) 308 return -ENOMEM; 309 310 /* initiator seal encryption */ 311 keyout.len = ctx->gk5e->Ke_length; 312 if (krb5_derive_key(ctx, &keyin, &keyout, KG_USAGE_INITIATOR_SEAL, 313 KEY_USAGE_SEED_ENCRYPTION, gfp_mask)) 314 goto out; 315 ctx->initiator_enc = gss_krb5_alloc_cipher_v2(ctx->gk5e->encrypt_name, 316 &keyout); 317 if (ctx->initiator_enc == NULL) 318 goto out; 319 if (ctx->gk5e->aux_cipher) { 320 ctx->initiator_enc_aux = 321 gss_krb5_alloc_cipher_v2(ctx->gk5e->aux_cipher, 322 &keyout); 323 if (ctx->initiator_enc_aux == NULL) 324 goto out_free; 325 } 326 327 /* acceptor seal encryption */ 328 if (krb5_derive_key(ctx, &keyin, &keyout, KG_USAGE_ACCEPTOR_SEAL, 329 KEY_USAGE_SEED_ENCRYPTION, gfp_mask)) 330 goto out_free; 331 ctx->acceptor_enc = gss_krb5_alloc_cipher_v2(ctx->gk5e->encrypt_name, 332 &keyout); 333 if (ctx->acceptor_enc == NULL) 334 goto out_free; 335 if (ctx->gk5e->aux_cipher) { 336 ctx->acceptor_enc_aux = 337 gss_krb5_alloc_cipher_v2(ctx->gk5e->aux_cipher, 338 &keyout); 339 if (ctx->acceptor_enc_aux == NULL) 340 goto out_free; 341 } 342 343 /* initiator sign checksum */ 344 keyout.len = ctx->gk5e->Kc_length; 345 if (krb5_derive_key(ctx, &keyin, &keyout, KG_USAGE_INITIATOR_SIGN, 346 KEY_USAGE_SEED_CHECKSUM, gfp_mask)) 347 goto out_free; 348 ctx->initiator_sign = gss_krb5_alloc_hash_v2(ctx, &keyout); 349 if (ctx->initiator_sign == NULL) 350 goto out_free; 351 352 /* acceptor sign checksum */ 353 if (krb5_derive_key(ctx, &keyin, &keyout, KG_USAGE_ACCEPTOR_SIGN, 354 KEY_USAGE_SEED_CHECKSUM, gfp_mask)) 355 goto out_free; 356 ctx->acceptor_sign = gss_krb5_alloc_hash_v2(ctx, &keyout); 357 if (ctx->acceptor_sign == NULL) 358 goto out_free; 359 360 /* initiator seal integrity */ 361 keyout.len = ctx->gk5e->Ki_length; 362 if (krb5_derive_key(ctx, &keyin, &keyout, KG_USAGE_INITIATOR_SEAL, 363 KEY_USAGE_SEED_INTEGRITY, gfp_mask)) 364 goto out_free; 365 ctx->initiator_integ = gss_krb5_alloc_hash_v2(ctx, &keyout); 366 if (ctx->initiator_integ == NULL) 367 goto out_free; 368 369 /* acceptor seal integrity */ 370 if (krb5_derive_key(ctx, &keyin, &keyout, KG_USAGE_ACCEPTOR_SEAL, 371 KEY_USAGE_SEED_INTEGRITY, gfp_mask)) 372 goto out_free; 373 ctx->acceptor_integ = gss_krb5_alloc_hash_v2(ctx, &keyout); 374 if (ctx->acceptor_integ == NULL) 375 goto out_free; 376 377 ret = 0; 378 out: 379 kfree_sensitive(keyout.data); 380 return ret; 381 382 out_free: 383 crypto_free_ahash(ctx->acceptor_integ); 384 crypto_free_ahash(ctx->initiator_integ); 385 crypto_free_ahash(ctx->acceptor_sign); 386 crypto_free_ahash(ctx->initiator_sign); 387 crypto_free_sync_skcipher(ctx->acceptor_enc_aux); 388 crypto_free_sync_skcipher(ctx->acceptor_enc); 389 crypto_free_sync_skcipher(ctx->initiator_enc_aux); 390 crypto_free_sync_skcipher(ctx->initiator_enc); 391 goto out; 392 } 393 394 static int 395 gss_import_v2_context(const void *p, const void *end, struct krb5_ctx *ctx, 396 gfp_t gfp_mask) 397 { 398 u64 seq_send64; 399 int keylen; 400 u32 time32; 401 int ret; 402 403 p = simple_get_bytes(p, end, &ctx->flags, sizeof(ctx->flags)); 404 if (IS_ERR(p)) 405 goto out_err; 406 ctx->initiate = ctx->flags & KRB5_CTX_FLAG_INITIATOR; 407 408 p = simple_get_bytes(p, end, &time32, sizeof(time32)); 409 if (IS_ERR(p)) 410 goto out_err; 411 /* unsigned 32-bit time overflows in year 2106 */ 412 ctx->endtime = (time64_t)time32; 413 p = simple_get_bytes(p, end, &seq_send64, sizeof(seq_send64)); 414 if (IS_ERR(p)) 415 goto out_err; 416 atomic64_set(&ctx->seq_send64, seq_send64); 417 /* set seq_send for use by "older" enctypes */ 418 atomic_set(&ctx->seq_send, seq_send64); 419 if (seq_send64 != atomic_read(&ctx->seq_send)) { 420 dprintk("%s: seq_send64 %llx, seq_send %x overflow?\n", __func__, 421 seq_send64, atomic_read(&ctx->seq_send)); 422 p = ERR_PTR(-EINVAL); 423 goto out_err; 424 } 425 p = simple_get_bytes(p, end, &ctx->enctype, sizeof(ctx->enctype)); 426 if (IS_ERR(p)) 427 goto out_err; 428 ctx->gk5e = gss_krb5_lookup_enctype(ctx->enctype); 429 if (ctx->gk5e == NULL) { 430 dprintk("gss_kerberos_mech: unsupported krb5 enctype %u\n", 431 ctx->enctype); 432 p = ERR_PTR(-EINVAL); 433 goto out_err; 434 } 435 keylen = ctx->gk5e->keylength; 436 437 p = simple_get_bytes(p, end, ctx->Ksess, keylen); 438 if (IS_ERR(p)) 439 goto out_err; 440 441 if (p != end) { 442 p = ERR_PTR(-EINVAL); 443 goto out_err; 444 } 445 446 ctx->mech_used.data = kmemdup(gss_kerberos_mech.gm_oid.data, 447 gss_kerberos_mech.gm_oid.len, gfp_mask); 448 if (unlikely(ctx->mech_used.data == NULL)) { 449 p = ERR_PTR(-ENOMEM); 450 goto out_err; 451 } 452 ctx->mech_used.len = gss_kerberos_mech.gm_oid.len; 453 454 ret = gss_krb5_import_ctx_v2(ctx, gfp_mask); 455 if (ret) { 456 p = ERR_PTR(ret); 457 goto out_free; 458 } 459 460 return 0; 461 462 out_free: 463 kfree(ctx->mech_used.data); 464 out_err: 465 return PTR_ERR(p); 466 } 467 468 static int 469 gss_krb5_import_sec_context(const void *p, size_t len, struct gss_ctx *ctx_id, 470 time64_t *endtime, gfp_t gfp_mask) 471 { 472 const void *end = (const void *)((const char *)p + len); 473 struct krb5_ctx *ctx; 474 int ret; 475 476 ctx = kzalloc(sizeof(*ctx), gfp_mask); 477 if (ctx == NULL) 478 return -ENOMEM; 479 480 ret = gss_import_v2_context(p, end, ctx, gfp_mask); 481 memzero_explicit(&ctx->Ksess, sizeof(ctx->Ksess)); 482 if (ret) { 483 kfree(ctx); 484 return ret; 485 } 486 487 ctx_id->internal_ctx_id = ctx; 488 if (endtime) 489 *endtime = ctx->endtime; 490 return 0; 491 } 492 493 static void 494 gss_krb5_delete_sec_context(void *internal_ctx) 495 { 496 struct krb5_ctx *kctx = internal_ctx; 497 498 crypto_free_sync_skcipher(kctx->seq); 499 crypto_free_sync_skcipher(kctx->enc); 500 crypto_free_sync_skcipher(kctx->acceptor_enc); 501 crypto_free_sync_skcipher(kctx->initiator_enc); 502 crypto_free_sync_skcipher(kctx->acceptor_enc_aux); 503 crypto_free_sync_skcipher(kctx->initiator_enc_aux); 504 crypto_free_ahash(kctx->acceptor_sign); 505 crypto_free_ahash(kctx->initiator_sign); 506 crypto_free_ahash(kctx->acceptor_integ); 507 crypto_free_ahash(kctx->initiator_integ); 508 kfree(kctx->mech_used.data); 509 kfree(kctx); 510 } 511 512 /** 513 * gss_krb5_get_mic - get_mic for the Kerberos GSS mechanism 514 * @gctx: GSS context 515 * @text: plaintext to checksum 516 * @token: buffer into which to write the computed checksum 517 * 518 * Return values: 519 * %GSS_S_COMPLETE - success, and @token is filled in 520 * %GSS_S_FAILURE - checksum could not be generated 521 * %GSS_S_CONTEXT_EXPIRED - Kerberos context is no longer valid 522 */ 523 static u32 gss_krb5_get_mic(struct gss_ctx *gctx, struct xdr_buf *text, 524 struct xdr_netobj *token) 525 { 526 struct krb5_ctx *kctx = gctx->internal_ctx_id; 527 528 return kctx->gk5e->get_mic(kctx, text, token); 529 } 530 531 /** 532 * gss_krb5_verify_mic - verify_mic for the Kerberos GSS mechanism 533 * @gctx: GSS context 534 * @message_buffer: plaintext to check 535 * @read_token: received checksum to check 536 * 537 * Return values: 538 * %GSS_S_COMPLETE - computed and received checksums match 539 * %GSS_S_DEFECTIVE_TOKEN - received checksum is not valid 540 * %GSS_S_BAD_SIG - computed and received checksums do not match 541 * %GSS_S_FAILURE - received checksum could not be checked 542 * %GSS_S_CONTEXT_EXPIRED - Kerberos context is no longer valid 543 */ 544 static u32 gss_krb5_verify_mic(struct gss_ctx *gctx, 545 struct xdr_buf *message_buffer, 546 struct xdr_netobj *read_token) 547 { 548 struct krb5_ctx *kctx = gctx->internal_ctx_id; 549 550 return kctx->gk5e->verify_mic(kctx, message_buffer, read_token); 551 } 552 553 /** 554 * gss_krb5_wrap - gss_wrap for the Kerberos GSS mechanism 555 * @gctx: initialized GSS context 556 * @offset: byte offset in @buf to start writing the cipher text 557 * @buf: OUT: send buffer 558 * @pages: plaintext to wrap 559 * 560 * Return values: 561 * %GSS_S_COMPLETE - success, @buf has been updated 562 * %GSS_S_FAILURE - @buf could not be wrapped 563 * %GSS_S_CONTEXT_EXPIRED - Kerberos context is no longer valid 564 */ 565 static u32 gss_krb5_wrap(struct gss_ctx *gctx, int offset, 566 struct xdr_buf *buf, struct page **pages) 567 { 568 struct krb5_ctx *kctx = gctx->internal_ctx_id; 569 570 return kctx->gk5e->wrap(kctx, offset, buf, pages); 571 } 572 573 /** 574 * gss_krb5_unwrap - gss_unwrap for the Kerberos GSS mechanism 575 * @gctx: initialized GSS context 576 * @offset: starting byte offset into @buf 577 * @len: size of ciphertext to unwrap 578 * @buf: ciphertext to unwrap 579 * 580 * Return values: 581 * %GSS_S_COMPLETE - success, @buf has been updated 582 * %GSS_S_DEFECTIVE_TOKEN - received blob is not valid 583 * %GSS_S_BAD_SIG - computed and received checksums do not match 584 * %GSS_S_FAILURE - @buf could not be unwrapped 585 * %GSS_S_CONTEXT_EXPIRED - Kerberos context is no longer valid 586 */ 587 static u32 gss_krb5_unwrap(struct gss_ctx *gctx, int offset, 588 int len, struct xdr_buf *buf) 589 { 590 struct krb5_ctx *kctx = gctx->internal_ctx_id; 591 592 return kctx->gk5e->unwrap(kctx, offset, len, buf, 593 &gctx->slack, &gctx->align); 594 } 595 596 static const struct gss_api_ops gss_kerberos_ops = { 597 .gss_import_sec_context = gss_krb5_import_sec_context, 598 .gss_get_mic = gss_krb5_get_mic, 599 .gss_verify_mic = gss_krb5_verify_mic, 600 .gss_wrap = gss_krb5_wrap, 601 .gss_unwrap = gss_krb5_unwrap, 602 .gss_delete_sec_context = gss_krb5_delete_sec_context, 603 }; 604 605 static struct pf_desc gss_kerberos_pfs[] = { 606 [0] = { 607 .pseudoflavor = RPC_AUTH_GSS_KRB5, 608 .qop = GSS_C_QOP_DEFAULT, 609 .service = RPC_GSS_SVC_NONE, 610 .name = "krb5", 611 }, 612 [1] = { 613 .pseudoflavor = RPC_AUTH_GSS_KRB5I, 614 .qop = GSS_C_QOP_DEFAULT, 615 .service = RPC_GSS_SVC_INTEGRITY, 616 .name = "krb5i", 617 .datatouch = true, 618 }, 619 [2] = { 620 .pseudoflavor = RPC_AUTH_GSS_KRB5P, 621 .qop = GSS_C_QOP_DEFAULT, 622 .service = RPC_GSS_SVC_PRIVACY, 623 .name = "krb5p", 624 .datatouch = true, 625 }, 626 }; 627 628 MODULE_ALIAS("rpc-auth-gss-krb5"); 629 MODULE_ALIAS("rpc-auth-gss-krb5i"); 630 MODULE_ALIAS("rpc-auth-gss-krb5p"); 631 MODULE_ALIAS("rpc-auth-gss-390003"); 632 MODULE_ALIAS("rpc-auth-gss-390004"); 633 MODULE_ALIAS("rpc-auth-gss-390005"); 634 MODULE_ALIAS("rpc-auth-gss-1.2.840.113554.1.2.2"); 635 636 static struct gss_api_mech gss_kerberos_mech = { 637 .gm_name = "krb5", 638 .gm_owner = THIS_MODULE, 639 .gm_oid = { 9, "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02" }, 640 .gm_ops = &gss_kerberos_ops, 641 .gm_pf_num = ARRAY_SIZE(gss_kerberos_pfs), 642 .gm_pfs = gss_kerberos_pfs, 643 .gm_upcall_enctypes = gss_krb5_enctype_priority_list, 644 }; 645 646 static int __init init_kerberos_module(void) 647 { 648 int status; 649 650 gss_krb5_prepare_enctype_priority_list(); 651 status = gss_mech_register(&gss_kerberos_mech); 652 if (status) 653 printk("Failed to register kerberos gss mechanism!\n"); 654 return status; 655 } 656 657 static void __exit cleanup_kerberos_module(void) 658 { 659 gss_mech_unregister(&gss_kerberos_mech); 660 } 661 662 MODULE_DESCRIPTION("Sun RPC Kerberos 5 module"); 663 MODULE_LICENSE("GPL"); 664 module_init(init_kerberos_module); 665 module_exit(cleanup_kerberos_module); 666