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