1 // SPDX-License-Identifier: GPL-2.0 2 3 #include <linux/ceph/ceph_debug.h> 4 5 #include <linux/err.h> 6 #include <linux/module.h> 7 #include <linux/random.h> 8 #include <linux/slab.h> 9 10 #include <linux/ceph/decode.h> 11 #include <linux/ceph/auth.h> 12 #include <linux/ceph/ceph_features.h> 13 #include <linux/ceph/libceph.h> 14 #include <linux/ceph/messenger.h> 15 16 #include "crypto.h" 17 #include "auth_x.h" 18 #include "auth_x_protocol.h" 19 20 static const u32 ticket_key_usages[] = { 21 CEPHX_KEY_USAGE_TICKET_SESSION_KEY, 22 CEPHX_KEY_USAGE_TICKET_BLOB, 23 CEPHX_KEY_USAGE_AUTH_CONNECTION_SECRET 24 }; 25 26 static const u32 authorizer_key_usages[] = { 27 CEPHX_KEY_USAGE_AUTHORIZE, 28 CEPHX_KEY_USAGE_AUTHORIZE_CHALLENGE, 29 CEPHX_KEY_USAGE_AUTHORIZE_REPLY 30 }; 31 32 static const u32 client_key_usages[] = { 33 CEPHX_KEY_USAGE_TICKET_SESSION_KEY 34 }; 35 36 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed); 37 38 static int ceph_x_is_authenticated(struct ceph_auth_client *ac) 39 { 40 struct ceph_x_info *xi = ac->private; 41 int missing; 42 int need; /* missing + need renewal */ 43 44 ceph_x_validate_tickets(ac, &need); 45 missing = ac->want_keys & ~xi->have_keys; 46 WARN_ON((need & missing) != missing); 47 dout("%s want 0x%x have 0x%x missing 0x%x -> %d\n", __func__, 48 ac->want_keys, xi->have_keys, missing, !missing); 49 return !missing; 50 } 51 52 static int ceph_x_should_authenticate(struct ceph_auth_client *ac) 53 { 54 struct ceph_x_info *xi = ac->private; 55 int need; 56 57 ceph_x_validate_tickets(ac, &need); 58 dout("%s want 0x%x have 0x%x need 0x%x -> %d\n", __func__, 59 ac->want_keys, xi->have_keys, need, !!need); 60 return !!need; 61 } 62 63 static int __ceph_x_encrypt_offset(const struct ceph_crypto_key *key) 64 { 65 return ceph_crypt_data_offset(key) + 66 sizeof(struct ceph_x_encrypt_header); 67 } 68 69 static int ceph_x_encrypt_offset(const struct ceph_crypto_key *key) 70 { 71 return sizeof(u32) + __ceph_x_encrypt_offset(key); 72 } 73 74 /* 75 * AES: ciphertext_len | hdr | data... | padding 76 * AES256KRB5: ciphertext_len | confounder | hdr | data... | hmac 77 */ 78 static int ceph_x_encrypt_buflen(const struct ceph_crypto_key *key, 79 int data_len) 80 { 81 int encrypt_len = sizeof(struct ceph_x_encrypt_header) + data_len; 82 return sizeof(u32) + ceph_crypt_buflen(key, encrypt_len); 83 } 84 85 static int ceph_x_encrypt(const struct ceph_crypto_key *key, int usage_slot, 86 void *buf, int buf_len, int plaintext_len) 87 { 88 struct ceph_x_encrypt_header *hdr; 89 int ciphertext_len; 90 int ret; 91 92 hdr = buf + sizeof(u32) + ceph_crypt_data_offset(key); 93 hdr->struct_v = 1; 94 hdr->magic = cpu_to_le64(CEPHX_ENC_MAGIC); 95 96 ret = ceph_crypt(key, usage_slot, true, buf + sizeof(u32), 97 buf_len - sizeof(u32), plaintext_len + sizeof(*hdr), 98 &ciphertext_len); 99 if (ret) 100 return ret; 101 102 ceph_encode_32(&buf, ciphertext_len); 103 return sizeof(u32) + ciphertext_len; 104 } 105 106 static int __ceph_x_decrypt(const struct ceph_crypto_key *key, int usage_slot, 107 void *p, int ciphertext_len) 108 { 109 struct ceph_x_encrypt_header *hdr; 110 int plaintext_len; 111 int ret; 112 113 ret = ceph_crypt(key, usage_slot, false, p, ciphertext_len, 114 ciphertext_len, &plaintext_len); 115 if (ret) 116 return ret; 117 118 hdr = p + ceph_crypt_data_offset(key); 119 if (le64_to_cpu(hdr->magic) != CEPHX_ENC_MAGIC) { 120 pr_err("%s bad magic\n", __func__); 121 return -EINVAL; 122 } 123 124 return plaintext_len - sizeof(*hdr); 125 } 126 127 static int ceph_x_decrypt(const struct ceph_crypto_key *key, int usage_slot, 128 void **p, void *end) 129 { 130 int ciphertext_len; 131 int ret; 132 133 ceph_decode_32_safe(p, end, ciphertext_len, e_inval); 134 ceph_decode_need(p, end, ciphertext_len, e_inval); 135 136 ret = __ceph_x_decrypt(key, usage_slot, *p, ciphertext_len); 137 if (ret < 0) 138 return ret; 139 140 *p += ciphertext_len; 141 return ret; 142 143 e_inval: 144 return -EINVAL; 145 } 146 147 /* 148 * get existing (or insert new) ticket handler 149 */ 150 static struct ceph_x_ticket_handler * 151 get_ticket_handler(struct ceph_auth_client *ac, int service) 152 { 153 struct ceph_x_ticket_handler *th; 154 struct ceph_x_info *xi = ac->private; 155 struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node; 156 157 while (*p) { 158 parent = *p; 159 th = rb_entry(parent, struct ceph_x_ticket_handler, node); 160 if (service < th->service) 161 p = &(*p)->rb_left; 162 else if (service > th->service) 163 p = &(*p)->rb_right; 164 else 165 return th; 166 } 167 168 /* add it */ 169 th = kzalloc_obj(*th, GFP_NOFS); 170 if (!th) 171 return ERR_PTR(-ENOMEM); 172 th->service = service; 173 rb_link_node(&th->node, parent, p); 174 rb_insert_color(&th->node, &xi->ticket_handlers); 175 return th; 176 } 177 178 static void remove_ticket_handler(struct ceph_auth_client *ac, 179 struct ceph_x_ticket_handler *th) 180 { 181 struct ceph_x_info *xi = ac->private; 182 183 dout("remove_ticket_handler %p %d\n", th, th->service); 184 rb_erase(&th->node, &xi->ticket_handlers); 185 ceph_crypto_key_destroy(&th->session_key); 186 if (th->ticket_blob) 187 ceph_buffer_put(th->ticket_blob); 188 kfree(th); 189 } 190 191 static int process_one_ticket(struct ceph_auth_client *ac, 192 struct ceph_crypto_key *secret, 193 void **p, void *end) 194 { 195 struct ceph_x_info *xi = ac->private; 196 int type; 197 u8 tkt_struct_v, blob_struct_v; 198 struct ceph_x_ticket_handler *th; 199 void *dp, *dend; 200 int dlen; 201 char is_enc; 202 struct timespec64 validity; 203 void *tp, *tpend; 204 void **ptp; 205 struct ceph_crypto_key new_session_key = { 0 }; 206 struct ceph_buffer *new_ticket_blob; 207 time64_t new_expires, new_renew_after; 208 u64 new_secret_id; 209 int ret; 210 211 ceph_decode_need(p, end, sizeof(u32) + 1, bad); 212 213 type = ceph_decode_32(p); 214 dout(" ticket type %d %s\n", type, ceph_entity_type_name(type)); 215 216 tkt_struct_v = ceph_decode_8(p); 217 if (tkt_struct_v != 1) 218 goto bad; 219 220 th = get_ticket_handler(ac, type); 221 if (IS_ERR(th)) { 222 ret = PTR_ERR(th); 223 goto out; 224 } 225 226 /* blob for me */ 227 dp = *p + ceph_x_encrypt_offset(secret); 228 ret = ceph_x_decrypt(secret, 229 0 /* CEPHX_KEY_USAGE_TICKET_SESSION_KEY */, 230 p, end); 231 if (ret < 0) 232 goto out; 233 dout(" decrypted %d bytes\n", ret); 234 dend = dp + ret; 235 236 ceph_decode_8_safe(&dp, dend, tkt_struct_v, bad); 237 if (tkt_struct_v != 1) 238 goto bad; 239 240 ret = ceph_crypto_key_decode(&new_session_key, &dp, dend); 241 if (ret) 242 goto out; 243 244 ret = ceph_crypto_key_prepare(&new_session_key, ticket_key_usages, 245 ARRAY_SIZE(ticket_key_usages)); 246 if (ret) 247 goto out; 248 249 ceph_decode_need(&dp, dend, sizeof(struct ceph_timespec), bad); 250 ceph_decode_timespec64(&validity, dp); 251 dp += sizeof(struct ceph_timespec); 252 new_expires = ktime_get_real_seconds() + validity.tv_sec; 253 new_renew_after = new_expires - (validity.tv_sec / 4); 254 dout(" expires=%llu renew_after=%llu\n", new_expires, 255 new_renew_after); 256 257 /* ticket blob for service */ 258 ceph_decode_8_safe(p, end, is_enc, bad); 259 if (is_enc) { 260 /* encrypted */ 261 tp = *p + ceph_x_encrypt_offset(&th->session_key); 262 ret = ceph_x_decrypt(&th->session_key, 263 1 /* CEPHX_KEY_USAGE_TICKET_BLOB */, 264 p, end); 265 if (ret < 0) 266 goto out; 267 dout(" encrypted ticket, decrypted %d bytes\n", ret); 268 ptp = &tp; 269 tpend = tp + ret; 270 } else { 271 /* unencrypted */ 272 ptp = p; 273 tpend = end; 274 } 275 ceph_decode_32_safe(ptp, tpend, dlen, bad); 276 dout(" ticket blob is %d bytes\n", dlen); 277 ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad); 278 blob_struct_v = ceph_decode_8(ptp); 279 if (blob_struct_v != 1) 280 goto bad; 281 282 new_secret_id = ceph_decode_64(ptp); 283 ret = ceph_decode_buffer(&new_ticket_blob, ptp, tpend); 284 if (ret) 285 goto out; 286 287 /* all is well, update our ticket */ 288 ceph_crypto_key_destroy(&th->session_key); 289 if (th->ticket_blob) 290 ceph_buffer_put(th->ticket_blob); 291 th->session_key = new_session_key; 292 th->ticket_blob = new_ticket_blob; 293 th->secret_id = new_secret_id; 294 th->expires = new_expires; 295 th->renew_after = new_renew_after; 296 th->have_key = true; 297 dout(" got ticket service %d (%s) secret_id %lld len %d\n", 298 type, ceph_entity_type_name(type), th->secret_id, 299 (int)th->ticket_blob->vec.iov_len); 300 xi->have_keys |= th->service; 301 return 0; 302 303 bad: 304 ret = -EINVAL; 305 out: 306 ceph_crypto_key_destroy(&new_session_key); 307 return ret; 308 } 309 310 static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac, 311 struct ceph_crypto_key *secret, 312 void **p, void *end) 313 { 314 u8 reply_struct_v; 315 u32 num; 316 int ret; 317 318 ceph_decode_8_safe(p, end, reply_struct_v, bad); 319 if (reply_struct_v != 1) 320 return -EINVAL; 321 322 ceph_decode_32_safe(p, end, num, bad); 323 dout("%d tickets\n", num); 324 325 while (num--) { 326 ret = process_one_ticket(ac, secret, p, end); 327 if (ret) 328 return ret; 329 } 330 331 return 0; 332 333 bad: 334 return -EINVAL; 335 } 336 337 /* 338 * Encode and encrypt the second part (ceph_x_authorize_b) of the 339 * authorizer. The first part (ceph_x_authorize_a) should already be 340 * encoded. 341 */ 342 static int encrypt_authorizer(struct ceph_x_authorizer *au, 343 u64 *server_challenge) 344 { 345 struct ceph_x_authorize_a *msg_a; 346 struct ceph_x_authorize_b *msg_b; 347 void *p, *end; 348 int ret; 349 350 msg_a = au->buf->vec.iov_base; 351 WARN_ON(msg_a->ticket_blob.secret_id != cpu_to_le64(au->secret_id)); 352 p = (void *)(msg_a + 1) + le32_to_cpu(msg_a->ticket_blob.blob_len); 353 end = au->buf->vec.iov_base + au->buf->vec.iov_len; 354 355 msg_b = p + ceph_x_encrypt_offset(&au->session_key); 356 msg_b->struct_v = 2; 357 msg_b->nonce = cpu_to_le64(au->nonce); 358 if (server_challenge) { 359 msg_b->have_challenge = 1; 360 msg_b->server_challenge_plus_one = 361 cpu_to_le64(*server_challenge + 1); 362 } else { 363 msg_b->have_challenge = 0; 364 msg_b->server_challenge_plus_one = 0; 365 } 366 367 ret = ceph_x_encrypt(&au->session_key, 368 0 /* CEPHX_KEY_USAGE_AUTHORIZE */, 369 p, end - p, sizeof(*msg_b)); 370 if (ret < 0) 371 return ret; 372 373 p += ret; 374 if (server_challenge) { 375 WARN_ON(p != end); 376 } else { 377 WARN_ON(p > end); 378 au->buf->vec.iov_len = p - au->buf->vec.iov_base; 379 } 380 381 return 0; 382 } 383 384 static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au) 385 { 386 ceph_crypto_key_destroy(&au->session_key); 387 if (au->buf) { 388 ceph_buffer_put(au->buf); 389 au->buf = NULL; 390 } 391 } 392 393 static int ceph_x_build_authorizer(struct ceph_auth_client *ac, 394 struct ceph_x_ticket_handler *th, 395 struct ceph_x_authorizer *au) 396 { 397 int maxlen; 398 struct ceph_x_authorize_a *msg_a; 399 struct ceph_x_authorize_b *msg_b; 400 int ret; 401 int ticket_blob_len = 402 (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0); 403 404 dout("build_authorizer for %s %p\n", 405 ceph_entity_type_name(th->service), au); 406 407 ceph_crypto_key_destroy(&au->session_key); 408 ret = ceph_crypto_key_clone(&au->session_key, &th->session_key); 409 if (ret) 410 goto out_au; 411 412 ret = ceph_crypto_key_prepare(&au->session_key, authorizer_key_usages, 413 ARRAY_SIZE(authorizer_key_usages)); 414 if (ret) 415 goto out_au; 416 417 maxlen = sizeof(*msg_a) + ticket_blob_len + 418 ceph_x_encrypt_buflen(&au->session_key, sizeof(*msg_b)); 419 dout(" need len %d\n", maxlen); 420 if (au->buf && au->buf->alloc_len < maxlen) { 421 ceph_buffer_put(au->buf); 422 au->buf = NULL; 423 } 424 if (!au->buf) { 425 au->buf = ceph_buffer_new(maxlen, GFP_NOFS); 426 if (!au->buf) { 427 ret = -ENOMEM; 428 goto out_au; 429 } 430 } 431 au->service = th->service; 432 WARN_ON(!th->secret_id); 433 au->secret_id = th->secret_id; 434 435 msg_a = au->buf->vec.iov_base; 436 msg_a->struct_v = 1; 437 msg_a->global_id = cpu_to_le64(ac->global_id); 438 msg_a->service_id = cpu_to_le32(th->service); 439 msg_a->ticket_blob.struct_v = 1; 440 msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id); 441 msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len); 442 if (ticket_blob_len) { 443 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base, 444 th->ticket_blob->vec.iov_len); 445 } 446 dout(" th %p secret_id %lld %lld\n", th, th->secret_id, 447 le64_to_cpu(msg_a->ticket_blob.secret_id)); 448 449 get_random_bytes(&au->nonce, sizeof(au->nonce)); 450 ret = encrypt_authorizer(au, NULL); 451 if (ret) { 452 pr_err("failed to encrypt authorizer: %d", ret); 453 goto out_au; 454 } 455 456 dout(" built authorizer nonce %llx len %d\n", au->nonce, 457 (int)au->buf->vec.iov_len); 458 return 0; 459 460 out_au: 461 ceph_x_authorizer_cleanup(au); 462 return ret; 463 } 464 465 static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th, 466 void **p, void *end) 467 { 468 ceph_decode_need(p, end, 1 + sizeof(u64), bad); 469 ceph_encode_8(p, 1); 470 ceph_encode_64(p, th->secret_id); 471 if (th->ticket_blob) { 472 const char *buf = th->ticket_blob->vec.iov_base; 473 u32 len = th->ticket_blob->vec.iov_len; 474 475 ceph_encode_32_safe(p, end, len, bad); 476 ceph_encode_copy_safe(p, end, buf, len, bad); 477 } else { 478 ceph_encode_32_safe(p, end, 0, bad); 479 } 480 481 return 0; 482 bad: 483 return -ERANGE; 484 } 485 486 static bool need_key(struct ceph_x_ticket_handler *th) 487 { 488 if (!th->have_key) 489 return true; 490 491 return ktime_get_real_seconds() >= th->renew_after; 492 } 493 494 static bool have_key(struct ceph_x_ticket_handler *th) 495 { 496 if (th->have_key && ktime_get_real_seconds() >= th->expires) { 497 dout("ticket %d (%s) secret_id %llu expired\n", th->service, 498 ceph_entity_type_name(th->service), th->secret_id); 499 th->have_key = false; 500 } 501 502 return th->have_key; 503 } 504 505 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed) 506 { 507 int want = ac->want_keys; 508 struct ceph_x_info *xi = ac->private; 509 int service; 510 511 *pneed = ac->want_keys & ~(xi->have_keys); 512 513 for (service = 1; service <= want; service <<= 1) { 514 struct ceph_x_ticket_handler *th; 515 516 if (!(ac->want_keys & service)) 517 continue; 518 519 if (*pneed & service) 520 continue; 521 522 th = get_ticket_handler(ac, service); 523 if (IS_ERR(th)) { 524 *pneed |= service; 525 continue; 526 } 527 528 if (need_key(th)) 529 *pneed |= service; 530 if (!have_key(th)) 531 xi->have_keys &= ~service; 532 } 533 } 534 535 static int ceph_x_build_request(struct ceph_auth_client *ac, 536 void *buf, void *end) 537 { 538 struct ceph_x_info *xi = ac->private; 539 int need; 540 struct ceph_x_request_header *head = buf; 541 void *p; 542 int ret; 543 struct ceph_x_ticket_handler *th = 544 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); 545 546 if (IS_ERR(th)) 547 return PTR_ERR(th); 548 549 ceph_x_validate_tickets(ac, &need); 550 dout("%s want 0x%x have 0x%x need 0x%x\n", __func__, ac->want_keys, 551 xi->have_keys, need); 552 553 if (need & CEPH_ENTITY_TYPE_AUTH) { 554 struct ceph_x_authenticate *auth = (void *)(head + 1); 555 void *enc_buf = xi->auth_authorizer.enc_buf; 556 struct ceph_x_challenge_blob *blob; 557 u64 *u; 558 559 p = auth + 1; 560 if (p > end) 561 return -ERANGE; 562 563 dout(" get_auth_session_key\n"); 564 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY); 565 566 if (xi->secret.type == CEPH_CRYPTO_AES) { 567 blob = enc_buf + ceph_x_encrypt_offset(&xi->secret); 568 } else { 569 BUILD_BUG_ON(SHA256_DIGEST_SIZE + sizeof(*blob) > 570 CEPHX_AU_ENC_BUF_LEN); 571 blob = enc_buf + SHA256_DIGEST_SIZE; 572 } 573 574 get_random_bytes(&auth->client_challenge, sizeof(u64)); 575 blob->client_challenge = auth->client_challenge; 576 blob->server_challenge = cpu_to_le64(xi->server_challenge); 577 578 if (xi->secret.type == CEPH_CRYPTO_AES) { 579 ret = ceph_x_encrypt(&xi->secret, 0 /* dummy */, 580 enc_buf, CEPHX_AU_ENC_BUF_LEN, 581 sizeof(*blob)); 582 if (ret < 0) 583 return ret; 584 } else { 585 ceph_hmac_sha256(&xi->secret, blob, sizeof(*blob), 586 enc_buf); 587 ret = SHA256_DIGEST_SIZE; 588 } 589 590 auth->struct_v = 3; /* nautilus+ */ 591 auth->key = 0; 592 for (u = (u64 *)enc_buf; u + 1 <= (u64 *)(enc_buf + ret); u++) 593 auth->key ^= *(__le64 *)u; 594 dout(" server_challenge %llx client_challenge %llx key %llx\n", 595 xi->server_challenge, le64_to_cpu(auth->client_challenge), 596 le64_to_cpu(auth->key)); 597 598 /* now encode the old ticket if exists */ 599 ret = ceph_x_encode_ticket(th, &p, end); 600 if (ret < 0) 601 return ret; 602 603 /* nautilus+: request service tickets at the same time */ 604 need = ac->want_keys & ~CEPH_ENTITY_TYPE_AUTH; 605 WARN_ON(!need); 606 ceph_encode_32_safe(&p, end, need, e_range); 607 return p - buf; 608 } 609 610 if (need) { 611 dout(" get_principal_session_key\n"); 612 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer); 613 if (ret) 614 return ret; 615 616 p = buf; 617 ceph_encode_16_safe(&p, end, CEPHX_GET_PRINCIPAL_SESSION_KEY, 618 e_range); 619 ceph_encode_copy_safe(&p, end, 620 xi->auth_authorizer.buf->vec.iov_base, 621 xi->auth_authorizer.buf->vec.iov_len, e_range); 622 ceph_encode_8_safe(&p, end, 1, e_range); 623 ceph_encode_32_safe(&p, end, need, e_range); 624 return p - buf; 625 } 626 627 return 0; 628 629 e_range: 630 return -ERANGE; 631 } 632 633 static int decode_con_secret(void **p, void *end, u8 *con_secret, 634 int *con_secret_len) 635 { 636 int len; 637 638 ceph_decode_32_safe(p, end, len, bad); 639 ceph_decode_need(p, end, len, bad); 640 641 dout("%s len %d\n", __func__, len); 642 if (con_secret) { 643 if (len > CEPH_MAX_CON_SECRET_LEN) { 644 pr_err("connection secret too big %d\n", len); 645 goto bad_memzero; 646 } 647 memcpy(con_secret, *p, len); 648 *con_secret_len = len; 649 } 650 memzero_explicit(*p, len); 651 *p += len; 652 return 0; 653 654 bad_memzero: 655 memzero_explicit(*p, len); 656 bad: 657 pr_err("failed to decode connection secret\n"); 658 return -EINVAL; 659 } 660 661 static int handle_auth_session_key(struct ceph_auth_client *ac, u64 global_id, 662 void **p, void *end, 663 u8 *session_key, int *session_key_len, 664 u8 *con_secret, int *con_secret_len) 665 { 666 struct ceph_x_info *xi = ac->private; 667 struct ceph_x_ticket_handler *th; 668 void *dp, *dend; 669 int len; 670 int ret; 671 672 /* AUTH ticket */ 673 ret = ceph_x_proc_ticket_reply(ac, &xi->secret, p, end); 674 if (ret) 675 return ret; 676 677 ceph_auth_set_global_id(ac, global_id); 678 if (*p == end) { 679 /* pre-nautilus (or didn't request service tickets!) */ 680 WARN_ON(session_key || con_secret); 681 return 0; 682 } 683 684 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); 685 if (IS_ERR(th)) 686 return PTR_ERR(th); 687 688 if (session_key) { 689 memcpy(session_key, th->session_key.key, th->session_key.len); 690 *session_key_len = th->session_key.len; 691 } 692 693 /* connection secret */ 694 ceph_decode_32_safe(p, end, len, e_inval); 695 ceph_decode_need(p, end, len, e_inval); 696 dout("%s connection secret blob len %d\n", __func__, len); 697 if (len > 0) { 698 dp = *p + ceph_x_encrypt_offset(&th->session_key); 699 ret = ceph_x_decrypt(&th->session_key, 700 2 /* CEPHX_KEY_USAGE_AUTH_CONNECTION_SECRET */, 701 p, *p + len); 702 if (ret < 0) 703 return ret; 704 705 dout("%s decrypted %d bytes\n", __func__, ret); 706 dend = dp + ret; 707 708 ret = decode_con_secret(&dp, dend, con_secret, con_secret_len); 709 if (ret) 710 return ret; 711 } 712 713 /* service tickets */ 714 ceph_decode_32_safe(p, end, len, e_inval); 715 ceph_decode_need(p, end, len, e_inval); 716 dout("%s service tickets blob len %d\n", __func__, len); 717 if (len > 0) { 718 ret = ceph_x_proc_ticket_reply(ac, &th->session_key, 719 p, *p + len); 720 if (ret) 721 return ret; 722 } 723 724 return 0; 725 726 e_inval: 727 return -EINVAL; 728 } 729 730 static int ceph_x_handle_reply(struct ceph_auth_client *ac, u64 global_id, 731 void *buf, void *end, 732 u8 *session_key, int *session_key_len, 733 u8 *con_secret, int *con_secret_len) 734 { 735 struct ceph_x_info *xi = ac->private; 736 struct ceph_x_ticket_handler *th; 737 int len = end - buf; 738 int result; 739 void *p; 740 int op; 741 int ret; 742 743 if (xi->starting) { 744 /* it's a hello */ 745 struct ceph_x_server_challenge *sc = buf; 746 747 if (len != sizeof(*sc)) 748 return -EINVAL; 749 xi->server_challenge = le64_to_cpu(sc->server_challenge); 750 dout("handle_reply got server challenge %llx\n", 751 xi->server_challenge); 752 xi->starting = false; 753 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH; 754 return -EAGAIN; 755 } 756 757 p = buf; 758 ceph_decode_16_safe(&p, end, op, e_inval); 759 ceph_decode_32_safe(&p, end, result, e_inval); 760 dout("handle_reply op %d result %d\n", op, result); 761 switch (op) { 762 case CEPHX_GET_AUTH_SESSION_KEY: 763 /* AUTH ticket + [connection secret] + service tickets */ 764 ret = handle_auth_session_key(ac, global_id, &p, end, 765 session_key, session_key_len, 766 con_secret, con_secret_len); 767 break; 768 769 case CEPHX_GET_PRINCIPAL_SESSION_KEY: 770 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); 771 if (IS_ERR(th)) 772 return PTR_ERR(th); 773 774 /* service tickets */ 775 ret = ceph_x_proc_ticket_reply(ac, &th->session_key, &p, end); 776 break; 777 778 default: 779 return -EINVAL; 780 } 781 if (ret) 782 return ret; 783 if (ac->want_keys == xi->have_keys) 784 return 0; 785 return -EAGAIN; 786 787 e_inval: 788 return -EINVAL; 789 } 790 791 static void ceph_x_destroy_authorizer(struct ceph_authorizer *a) 792 { 793 struct ceph_x_authorizer *au = (void *)a; 794 795 ceph_x_authorizer_cleanup(au); 796 kfree(au); 797 } 798 799 static int ceph_x_create_authorizer( 800 struct ceph_auth_client *ac, int peer_type, 801 struct ceph_auth_handshake *auth) 802 { 803 struct ceph_x_authorizer *au; 804 struct ceph_x_ticket_handler *th; 805 int ret; 806 807 th = get_ticket_handler(ac, peer_type); 808 if (IS_ERR(th)) 809 return PTR_ERR(th); 810 811 au = kzalloc_obj(*au, GFP_NOFS); 812 if (!au) 813 return -ENOMEM; 814 815 au->base.destroy = ceph_x_destroy_authorizer; 816 817 ret = ceph_x_build_authorizer(ac, th, au); 818 if (ret) { 819 kfree(au); 820 return ret; 821 } 822 823 auth->authorizer = (struct ceph_authorizer *) au; 824 auth->authorizer_buf = au->buf->vec.iov_base; 825 auth->authorizer_buf_len = au->buf->vec.iov_len; 826 auth->authorizer_reply_buf = au->enc_buf; 827 auth->authorizer_reply_buf_len = CEPHX_AU_ENC_BUF_LEN; 828 auth->sign_message = ac->ops->sign_message; 829 auth->check_message_signature = ac->ops->check_message_signature; 830 831 return 0; 832 } 833 834 static int ceph_x_update_authorizer( 835 struct ceph_auth_client *ac, int peer_type, 836 struct ceph_auth_handshake *auth) 837 { 838 struct ceph_x_authorizer *au; 839 struct ceph_x_ticket_handler *th; 840 841 th = get_ticket_handler(ac, peer_type); 842 if (IS_ERR(th)) 843 return PTR_ERR(th); 844 845 au = (struct ceph_x_authorizer *)auth->authorizer; 846 if (au->secret_id < th->secret_id) { 847 dout("ceph_x_update_authorizer service %u secret %llu < %llu\n", 848 au->service, au->secret_id, th->secret_id); 849 return ceph_x_build_authorizer(ac, th, au); 850 } 851 return 0; 852 } 853 854 /* 855 * CephXAuthorizeChallenge 856 */ 857 static int decrypt_authorizer_challenge(struct ceph_crypto_key *secret, 858 void *challenge, int challenge_len, 859 u64 *server_challenge) 860 { 861 void *dp, *dend; 862 int ret; 863 864 /* no leading len */ 865 ret = __ceph_x_decrypt(secret, 866 1 /* CEPHX_KEY_USAGE_AUTHORIZE_CHALLENGE */, 867 challenge, challenge_len); 868 if (ret < 0) 869 return ret; 870 871 dout("%s decrypted %d bytes\n", __func__, ret); 872 dp = challenge + __ceph_x_encrypt_offset(secret); 873 dend = dp + ret; 874 875 ceph_decode_skip_8(&dp, dend, e_inval); /* struct_v */ 876 ceph_decode_64_safe(&dp, dend, *server_challenge, e_inval); 877 dout("%s server_challenge %llu\n", __func__, *server_challenge); 878 return 0; 879 880 e_inval: 881 return -EINVAL; 882 } 883 884 static int ceph_x_add_authorizer_challenge(struct ceph_auth_client *ac, 885 struct ceph_authorizer *a, 886 void *challenge, int challenge_len) 887 { 888 struct ceph_x_authorizer *au = (void *)a; 889 u64 server_challenge; 890 int ret; 891 892 ret = decrypt_authorizer_challenge(&au->session_key, challenge, 893 challenge_len, &server_challenge); 894 if (ret) { 895 pr_err("failed to decrypt authorize challenge: %d", ret); 896 return ret; 897 } 898 899 ret = encrypt_authorizer(au, &server_challenge); 900 if (ret) { 901 pr_err("failed to encrypt authorizer w/ challenge: %d", ret); 902 return ret; 903 } 904 905 return 0; 906 } 907 908 /* 909 * CephXAuthorizeReply 910 */ 911 static int decrypt_authorizer_reply(struct ceph_crypto_key *secret, 912 void **p, void *end, u64 *nonce_plus_one, 913 u8 *con_secret, int *con_secret_len) 914 { 915 void *dp, *dend; 916 u8 struct_v; 917 int ret; 918 919 dp = *p + ceph_x_encrypt_offset(secret); 920 ret = ceph_x_decrypt(secret, 2 /* CEPHX_KEY_USAGE_AUTHORIZE_REPLY */, 921 p, end); 922 if (ret < 0) 923 return ret; 924 925 dout("%s decrypted %d bytes\n", __func__, ret); 926 dend = dp + ret; 927 928 ceph_decode_8_safe(&dp, dend, struct_v, e_inval); 929 ceph_decode_64_safe(&dp, dend, *nonce_plus_one, e_inval); 930 dout("%s nonce_plus_one %llu\n", __func__, *nonce_plus_one); 931 if (struct_v >= 2) { 932 ret = decode_con_secret(&dp, dend, con_secret, con_secret_len); 933 if (ret) 934 return ret; 935 } 936 937 return 0; 938 939 e_inval: 940 return -EINVAL; 941 } 942 943 static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac, 944 struct ceph_authorizer *a, 945 void *reply, int reply_len, 946 u8 *session_key, int *session_key_len, 947 u8 *con_secret, int *con_secret_len) 948 { 949 struct ceph_x_authorizer *au = (void *)a; 950 u64 nonce_plus_one; 951 int ret; 952 953 if (session_key) { 954 memcpy(session_key, au->session_key.key, au->session_key.len); 955 *session_key_len = au->session_key.len; 956 } 957 958 ret = decrypt_authorizer_reply(&au->session_key, &reply, 959 reply + reply_len, &nonce_plus_one, 960 con_secret, con_secret_len); 961 if (ret) 962 return ret; 963 964 if (nonce_plus_one != au->nonce + 1) { 965 pr_err("failed to authenticate server\n"); 966 return -EPERM; 967 } 968 969 return 0; 970 } 971 972 static void ceph_x_reset(struct ceph_auth_client *ac) 973 { 974 struct ceph_x_info *xi = ac->private; 975 976 dout("reset\n"); 977 xi->starting = true; 978 xi->server_challenge = 0; 979 } 980 981 static void ceph_x_destroy(struct ceph_auth_client *ac) 982 { 983 struct ceph_x_info *xi = ac->private; 984 struct rb_node *p; 985 986 dout("ceph_x_destroy %p\n", ac); 987 ceph_crypto_key_destroy(&xi->secret); 988 989 while ((p = rb_first(&xi->ticket_handlers)) != NULL) { 990 struct ceph_x_ticket_handler *th = 991 rb_entry(p, struct ceph_x_ticket_handler, node); 992 remove_ticket_handler(ac, th); 993 } 994 995 ceph_x_authorizer_cleanup(&xi->auth_authorizer); 996 997 kfree(ac->private); 998 ac->private = NULL; 999 } 1000 1001 static void invalidate_ticket(struct ceph_auth_client *ac, int peer_type) 1002 { 1003 struct ceph_x_ticket_handler *th; 1004 1005 th = get_ticket_handler(ac, peer_type); 1006 if (IS_ERR(th)) 1007 return; 1008 1009 if (th->have_key) { 1010 dout("ticket %d (%s) secret_id %llu invalidated\n", 1011 th->service, ceph_entity_type_name(th->service), 1012 th->secret_id); 1013 th->have_key = false; 1014 } 1015 } 1016 1017 static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac, 1018 int peer_type) 1019 { 1020 /* 1021 * We are to invalidate a service ticket in the hopes of 1022 * getting a new, hopefully more valid, one. But, we won't get 1023 * it unless our AUTH ticket is good, so invalidate AUTH ticket 1024 * as well, just in case. 1025 */ 1026 invalidate_ticket(ac, peer_type); 1027 invalidate_ticket(ac, CEPH_ENTITY_TYPE_AUTH); 1028 } 1029 1030 static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg, 1031 __le64 *psig) 1032 { 1033 void *enc_buf = au->enc_buf; 1034 int ret; 1035 1036 if (!CEPH_HAVE_FEATURE(msg->con->peer_features, CEPHX_V2)) { 1037 struct { 1038 __le32 len; 1039 __le32 header_crc; 1040 __le32 front_crc; 1041 __le32 middle_crc; 1042 __le32 data_crc; 1043 } __packed *sigblock = enc_buf + 1044 ceph_x_encrypt_offset(&au->session_key); 1045 1046 sigblock->len = cpu_to_le32(4*sizeof(u32)); 1047 sigblock->header_crc = msg->hdr.crc; 1048 sigblock->front_crc = msg->footer.front_crc; 1049 sigblock->middle_crc = msg->footer.middle_crc; 1050 sigblock->data_crc = msg->footer.data_crc; 1051 1052 ret = ceph_x_encrypt(&au->session_key, 0 /* dummy */, 1053 enc_buf, CEPHX_AU_ENC_BUF_LEN, 1054 sizeof(*sigblock)); 1055 if (ret < 0) 1056 return ret; 1057 1058 *psig = *(__le64 *)(enc_buf + sizeof(u32)); 1059 } else { 1060 struct { 1061 __le32 header_crc; 1062 __le32 front_crc; 1063 __le32 front_len; 1064 __le32 middle_crc; 1065 __le32 middle_len; 1066 __le32 data_crc; 1067 __le32 data_len; 1068 __le32 seq_lower_word; 1069 } __packed *sigblock; 1070 struct { 1071 __le64 a, b, c, d; 1072 } __packed *penc = enc_buf; 1073 1074 if (au->session_key.type == CEPH_CRYPTO_AES) { 1075 /* no leading len, no ceph_x_encrypt_header */ 1076 sigblock = enc_buf; 1077 } else { 1078 BUILD_BUG_ON(SHA256_DIGEST_SIZE + sizeof(*sigblock) > 1079 CEPHX_AU_ENC_BUF_LEN); 1080 sigblock = enc_buf + SHA256_DIGEST_SIZE; 1081 } 1082 1083 sigblock->header_crc = msg->hdr.crc; 1084 sigblock->front_crc = msg->footer.front_crc; 1085 sigblock->front_len = msg->hdr.front_len; 1086 sigblock->middle_crc = msg->footer.middle_crc; 1087 sigblock->middle_len = msg->hdr.middle_len; 1088 sigblock->data_crc = msg->footer.data_crc; 1089 sigblock->data_len = msg->hdr.data_len; 1090 sigblock->seq_lower_word = *(__le32 *)&msg->hdr.seq; 1091 1092 if (au->session_key.type == CEPH_CRYPTO_AES) { 1093 int ciphertext_len; /* unused */ 1094 1095 ret = ceph_crypt(&au->session_key, 0 /* dummy */, 1096 true, enc_buf, CEPHX_AU_ENC_BUF_LEN, 1097 sizeof(*sigblock), &ciphertext_len); 1098 if (ret) 1099 return ret; 1100 } else { 1101 ceph_hmac_sha256(&au->session_key, sigblock, 1102 sizeof(*sigblock), enc_buf); 1103 } 1104 1105 *psig = penc->a ^ penc->b ^ penc->c ^ penc->d; 1106 } 1107 1108 return 0; 1109 } 1110 1111 static int ceph_x_sign_message(struct ceph_auth_handshake *auth, 1112 struct ceph_msg *msg) 1113 { 1114 __le64 sig; 1115 int ret; 1116 1117 if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN)) 1118 return 0; 1119 1120 ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer, 1121 msg, &sig); 1122 if (ret) 1123 return ret; 1124 1125 msg->footer.sig = sig; 1126 msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED; 1127 return 0; 1128 } 1129 1130 static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth, 1131 struct ceph_msg *msg) 1132 { 1133 __le64 sig_check; 1134 int ret; 1135 1136 if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN)) 1137 return 0; 1138 1139 ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer, 1140 msg, &sig_check); 1141 if (ret) 1142 return ret; 1143 if (sig_check == msg->footer.sig) 1144 return 0; 1145 if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED) 1146 dout("ceph_x_check_message_signature %p has signature %llx " 1147 "expect %llx\n", msg, msg->footer.sig, sig_check); 1148 else 1149 dout("ceph_x_check_message_signature %p sender did not set " 1150 "CEPH_MSG_FOOTER_SIGNED\n", msg); 1151 return -EBADMSG; 1152 } 1153 1154 static const struct ceph_auth_client_ops ceph_x_ops = { 1155 .is_authenticated = ceph_x_is_authenticated, 1156 .should_authenticate = ceph_x_should_authenticate, 1157 .build_request = ceph_x_build_request, 1158 .handle_reply = ceph_x_handle_reply, 1159 .create_authorizer = ceph_x_create_authorizer, 1160 .update_authorizer = ceph_x_update_authorizer, 1161 .add_authorizer_challenge = ceph_x_add_authorizer_challenge, 1162 .verify_authorizer_reply = ceph_x_verify_authorizer_reply, 1163 .invalidate_authorizer = ceph_x_invalidate_authorizer, 1164 .reset = ceph_x_reset, 1165 .destroy = ceph_x_destroy, 1166 .sign_message = ceph_x_sign_message, 1167 .check_message_signature = ceph_x_check_message_signature, 1168 }; 1169 1170 1171 int ceph_x_init(struct ceph_auth_client *ac) 1172 { 1173 struct ceph_x_info *xi; 1174 int ret; 1175 1176 dout("ceph_x_init %p\n", ac); 1177 xi = kzalloc_obj(*xi, GFP_NOFS); 1178 if (!xi) 1179 return -ENOMEM; 1180 1181 ret = -EINVAL; 1182 if (!ac->key) { 1183 pr_err("no secret set (for auth_x protocol)\n"); 1184 goto err_xi; 1185 } 1186 1187 ret = ceph_crypto_key_clone(&xi->secret, ac->key); 1188 if (ret < 0) { 1189 pr_err("cannot clone key: %d\n", ret); 1190 goto err_xi; 1191 } 1192 1193 ret = ceph_crypto_key_prepare(&xi->secret, client_key_usages, 1194 ARRAY_SIZE(client_key_usages)); 1195 if (ret) { 1196 pr_err("cannot prepare key: %d\n", ret); 1197 goto err_secret; 1198 } 1199 1200 xi->starting = true; 1201 xi->ticket_handlers = RB_ROOT; 1202 1203 ac->protocol = CEPH_AUTH_CEPHX; 1204 ac->private = xi; 1205 ac->ops = &ceph_x_ops; 1206 return 0; 1207 1208 err_secret: 1209 ceph_crypto_key_destroy(&xi->secret); 1210 err_xi: 1211 kfree(xi); 1212 return ret; 1213 } 1214