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/libceph.h> 13 #include <linux/ceph/messenger.h> 14 15 #include "crypto.h" 16 #include "auth_x.h" 17 #include "auth_x_protocol.h" 18 19 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed); 20 21 static int ceph_x_is_authenticated(struct ceph_auth_client *ac) 22 { 23 struct ceph_x_info *xi = ac->private; 24 int need; 25 26 ceph_x_validate_tickets(ac, &need); 27 dout("ceph_x_is_authenticated want=%d need=%d have=%d\n", 28 ac->want_keys, need, xi->have_keys); 29 return (ac->want_keys & xi->have_keys) == ac->want_keys; 30 } 31 32 static int ceph_x_should_authenticate(struct ceph_auth_client *ac) 33 { 34 struct ceph_x_info *xi = ac->private; 35 int need; 36 37 ceph_x_validate_tickets(ac, &need); 38 dout("ceph_x_should_authenticate want=%d need=%d have=%d\n", 39 ac->want_keys, need, xi->have_keys); 40 return need != 0; 41 } 42 43 static int ceph_x_encrypt_offset(void) 44 { 45 return sizeof(u32) + sizeof(struct ceph_x_encrypt_header); 46 } 47 48 static int ceph_x_encrypt_buflen(int ilen) 49 { 50 return ceph_x_encrypt_offset() + ilen + 16; 51 } 52 53 static int ceph_x_encrypt(struct ceph_crypto_key *secret, void *buf, 54 int buf_len, int plaintext_len) 55 { 56 struct ceph_x_encrypt_header *hdr = buf + sizeof(u32); 57 int ciphertext_len; 58 int ret; 59 60 hdr->struct_v = 1; 61 hdr->magic = cpu_to_le64(CEPHX_ENC_MAGIC); 62 63 ret = ceph_crypt(secret, true, buf + sizeof(u32), buf_len - sizeof(u32), 64 plaintext_len + sizeof(struct ceph_x_encrypt_header), 65 &ciphertext_len); 66 if (ret) 67 return ret; 68 69 ceph_encode_32(&buf, ciphertext_len); 70 return sizeof(u32) + ciphertext_len; 71 } 72 73 static int ceph_x_decrypt(struct ceph_crypto_key *secret, void **p, void *end) 74 { 75 struct ceph_x_encrypt_header *hdr = *p + sizeof(u32); 76 int ciphertext_len, plaintext_len; 77 int ret; 78 79 ceph_decode_32_safe(p, end, ciphertext_len, e_inval); 80 ceph_decode_need(p, end, ciphertext_len, e_inval); 81 82 ret = ceph_crypt(secret, false, *p, end - *p, ciphertext_len, 83 &plaintext_len); 84 if (ret) 85 return ret; 86 87 if (hdr->struct_v != 1 || le64_to_cpu(hdr->magic) != CEPHX_ENC_MAGIC) 88 return -EPERM; 89 90 *p += ciphertext_len; 91 return plaintext_len - sizeof(struct ceph_x_encrypt_header); 92 93 e_inval: 94 return -EINVAL; 95 } 96 97 /* 98 * get existing (or insert new) ticket handler 99 */ 100 static struct ceph_x_ticket_handler * 101 get_ticket_handler(struct ceph_auth_client *ac, int service) 102 { 103 struct ceph_x_ticket_handler *th; 104 struct ceph_x_info *xi = ac->private; 105 struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node; 106 107 while (*p) { 108 parent = *p; 109 th = rb_entry(parent, struct ceph_x_ticket_handler, node); 110 if (service < th->service) 111 p = &(*p)->rb_left; 112 else if (service > th->service) 113 p = &(*p)->rb_right; 114 else 115 return th; 116 } 117 118 /* add it */ 119 th = kzalloc(sizeof(*th), GFP_NOFS); 120 if (!th) 121 return ERR_PTR(-ENOMEM); 122 th->service = service; 123 rb_link_node(&th->node, parent, p); 124 rb_insert_color(&th->node, &xi->ticket_handlers); 125 return th; 126 } 127 128 static void remove_ticket_handler(struct ceph_auth_client *ac, 129 struct ceph_x_ticket_handler *th) 130 { 131 struct ceph_x_info *xi = ac->private; 132 133 dout("remove_ticket_handler %p %d\n", th, th->service); 134 rb_erase(&th->node, &xi->ticket_handlers); 135 ceph_crypto_key_destroy(&th->session_key); 136 if (th->ticket_blob) 137 ceph_buffer_put(th->ticket_blob); 138 kfree(th); 139 } 140 141 static int process_one_ticket(struct ceph_auth_client *ac, 142 struct ceph_crypto_key *secret, 143 void **p, void *end) 144 { 145 struct ceph_x_info *xi = ac->private; 146 int type; 147 u8 tkt_struct_v, blob_struct_v; 148 struct ceph_x_ticket_handler *th; 149 void *dp, *dend; 150 int dlen; 151 char is_enc; 152 struct timespec validity; 153 void *tp, *tpend; 154 void **ptp; 155 struct ceph_crypto_key new_session_key = { 0 }; 156 struct ceph_buffer *new_ticket_blob; 157 unsigned long new_expires, new_renew_after; 158 u64 new_secret_id; 159 int ret; 160 161 ceph_decode_need(p, end, sizeof(u32) + 1, bad); 162 163 type = ceph_decode_32(p); 164 dout(" ticket type %d %s\n", type, ceph_entity_type_name(type)); 165 166 tkt_struct_v = ceph_decode_8(p); 167 if (tkt_struct_v != 1) 168 goto bad; 169 170 th = get_ticket_handler(ac, type); 171 if (IS_ERR(th)) { 172 ret = PTR_ERR(th); 173 goto out; 174 } 175 176 /* blob for me */ 177 dp = *p + ceph_x_encrypt_offset(); 178 ret = ceph_x_decrypt(secret, p, end); 179 if (ret < 0) 180 goto out; 181 dout(" decrypted %d bytes\n", ret); 182 dend = dp + ret; 183 184 tkt_struct_v = ceph_decode_8(&dp); 185 if (tkt_struct_v != 1) 186 goto bad; 187 188 ret = ceph_crypto_key_decode(&new_session_key, &dp, dend); 189 if (ret) 190 goto out; 191 192 ceph_decode_timespec(&validity, dp); 193 dp += sizeof(struct ceph_timespec); 194 new_expires = get_seconds() + validity.tv_sec; 195 new_renew_after = new_expires - (validity.tv_sec / 4); 196 dout(" expires=%lu renew_after=%lu\n", new_expires, 197 new_renew_after); 198 199 /* ticket blob for service */ 200 ceph_decode_8_safe(p, end, is_enc, bad); 201 if (is_enc) { 202 /* encrypted */ 203 tp = *p + ceph_x_encrypt_offset(); 204 ret = ceph_x_decrypt(&th->session_key, p, end); 205 if (ret < 0) 206 goto out; 207 dout(" encrypted ticket, decrypted %d bytes\n", ret); 208 ptp = &tp; 209 tpend = tp + ret; 210 } else { 211 /* unencrypted */ 212 ptp = p; 213 tpend = end; 214 } 215 ceph_decode_32_safe(ptp, tpend, dlen, bad); 216 dout(" ticket blob is %d bytes\n", dlen); 217 ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad); 218 blob_struct_v = ceph_decode_8(ptp); 219 if (blob_struct_v != 1) 220 goto bad; 221 222 new_secret_id = ceph_decode_64(ptp); 223 ret = ceph_decode_buffer(&new_ticket_blob, ptp, tpend); 224 if (ret) 225 goto out; 226 227 /* all is well, update our ticket */ 228 ceph_crypto_key_destroy(&th->session_key); 229 if (th->ticket_blob) 230 ceph_buffer_put(th->ticket_blob); 231 th->session_key = new_session_key; 232 th->ticket_blob = new_ticket_blob; 233 th->secret_id = new_secret_id; 234 th->expires = new_expires; 235 th->renew_after = new_renew_after; 236 th->have_key = true; 237 dout(" got ticket service %d (%s) secret_id %lld len %d\n", 238 type, ceph_entity_type_name(type), th->secret_id, 239 (int)th->ticket_blob->vec.iov_len); 240 xi->have_keys |= th->service; 241 return 0; 242 243 bad: 244 ret = -EINVAL; 245 out: 246 ceph_crypto_key_destroy(&new_session_key); 247 return ret; 248 } 249 250 static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac, 251 struct ceph_crypto_key *secret, 252 void *buf, void *end) 253 { 254 void *p = buf; 255 u8 reply_struct_v; 256 u32 num; 257 int ret; 258 259 ceph_decode_8_safe(&p, end, reply_struct_v, bad); 260 if (reply_struct_v != 1) 261 return -EINVAL; 262 263 ceph_decode_32_safe(&p, end, num, bad); 264 dout("%d tickets\n", num); 265 266 while (num--) { 267 ret = process_one_ticket(ac, secret, &p, end); 268 if (ret) 269 return ret; 270 } 271 272 return 0; 273 274 bad: 275 return -EINVAL; 276 } 277 278 static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au) 279 { 280 ceph_crypto_key_destroy(&au->session_key); 281 if (au->buf) { 282 ceph_buffer_put(au->buf); 283 au->buf = NULL; 284 } 285 } 286 287 static int ceph_x_build_authorizer(struct ceph_auth_client *ac, 288 struct ceph_x_ticket_handler *th, 289 struct ceph_x_authorizer *au) 290 { 291 int maxlen; 292 struct ceph_x_authorize_a *msg_a; 293 struct ceph_x_authorize_b *msg_b; 294 void *p, *end; 295 int ret; 296 int ticket_blob_len = 297 (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0); 298 299 dout("build_authorizer for %s %p\n", 300 ceph_entity_type_name(th->service), au); 301 302 ceph_crypto_key_destroy(&au->session_key); 303 ret = ceph_crypto_key_clone(&au->session_key, &th->session_key); 304 if (ret) 305 goto out_au; 306 307 maxlen = sizeof(*msg_a) + ticket_blob_len + 308 ceph_x_encrypt_buflen(sizeof(*msg_b)); 309 dout(" need len %d\n", maxlen); 310 if (au->buf && au->buf->alloc_len < maxlen) { 311 ceph_buffer_put(au->buf); 312 au->buf = NULL; 313 } 314 if (!au->buf) { 315 au->buf = ceph_buffer_new(maxlen, GFP_NOFS); 316 if (!au->buf) { 317 ret = -ENOMEM; 318 goto out_au; 319 } 320 } 321 au->service = th->service; 322 au->secret_id = th->secret_id; 323 324 msg_a = au->buf->vec.iov_base; 325 msg_a->struct_v = 1; 326 msg_a->global_id = cpu_to_le64(ac->global_id); 327 msg_a->service_id = cpu_to_le32(th->service); 328 msg_a->ticket_blob.struct_v = 1; 329 msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id); 330 msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len); 331 if (ticket_blob_len) { 332 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base, 333 th->ticket_blob->vec.iov_len); 334 } 335 dout(" th %p secret_id %lld %lld\n", th, th->secret_id, 336 le64_to_cpu(msg_a->ticket_blob.secret_id)); 337 338 p = msg_a + 1; 339 p += ticket_blob_len; 340 end = au->buf->vec.iov_base + au->buf->vec.iov_len; 341 342 msg_b = p + ceph_x_encrypt_offset(); 343 msg_b->struct_v = 1; 344 get_random_bytes(&au->nonce, sizeof(au->nonce)); 345 msg_b->nonce = cpu_to_le64(au->nonce); 346 ret = ceph_x_encrypt(&au->session_key, p, end - p, sizeof(*msg_b)); 347 if (ret < 0) 348 goto out_au; 349 350 p += ret; 351 WARN_ON(p > end); 352 au->buf->vec.iov_len = p - au->buf->vec.iov_base; 353 dout(" built authorizer nonce %llx len %d\n", au->nonce, 354 (int)au->buf->vec.iov_len); 355 return 0; 356 357 out_au: 358 ceph_x_authorizer_cleanup(au); 359 return ret; 360 } 361 362 static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th, 363 void **p, void *end) 364 { 365 ceph_decode_need(p, end, 1 + sizeof(u64), bad); 366 ceph_encode_8(p, 1); 367 ceph_encode_64(p, th->secret_id); 368 if (th->ticket_blob) { 369 const char *buf = th->ticket_blob->vec.iov_base; 370 u32 len = th->ticket_blob->vec.iov_len; 371 372 ceph_encode_32_safe(p, end, len, bad); 373 ceph_encode_copy_safe(p, end, buf, len, bad); 374 } else { 375 ceph_encode_32_safe(p, end, 0, bad); 376 } 377 378 return 0; 379 bad: 380 return -ERANGE; 381 } 382 383 static bool need_key(struct ceph_x_ticket_handler *th) 384 { 385 if (!th->have_key) 386 return true; 387 388 return get_seconds() >= th->renew_after; 389 } 390 391 static bool have_key(struct ceph_x_ticket_handler *th) 392 { 393 if (th->have_key) { 394 if (get_seconds() >= th->expires) 395 th->have_key = false; 396 } 397 398 return th->have_key; 399 } 400 401 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed) 402 { 403 int want = ac->want_keys; 404 struct ceph_x_info *xi = ac->private; 405 int service; 406 407 *pneed = ac->want_keys & ~(xi->have_keys); 408 409 for (service = 1; service <= want; service <<= 1) { 410 struct ceph_x_ticket_handler *th; 411 412 if (!(ac->want_keys & service)) 413 continue; 414 415 if (*pneed & service) 416 continue; 417 418 th = get_ticket_handler(ac, service); 419 if (IS_ERR(th)) { 420 *pneed |= service; 421 continue; 422 } 423 424 if (need_key(th)) 425 *pneed |= service; 426 if (!have_key(th)) 427 xi->have_keys &= ~service; 428 } 429 } 430 431 static int ceph_x_build_request(struct ceph_auth_client *ac, 432 void *buf, void *end) 433 { 434 struct ceph_x_info *xi = ac->private; 435 int need; 436 struct ceph_x_request_header *head = buf; 437 int ret; 438 struct ceph_x_ticket_handler *th = 439 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); 440 441 if (IS_ERR(th)) 442 return PTR_ERR(th); 443 444 ceph_x_validate_tickets(ac, &need); 445 446 dout("build_request want %x have %x need %x\n", 447 ac->want_keys, xi->have_keys, need); 448 449 if (need & CEPH_ENTITY_TYPE_AUTH) { 450 struct ceph_x_authenticate *auth = (void *)(head + 1); 451 void *p = auth + 1; 452 void *enc_buf = xi->auth_authorizer.enc_buf; 453 struct ceph_x_challenge_blob *blob = enc_buf + 454 ceph_x_encrypt_offset(); 455 u64 *u; 456 457 if (p > end) 458 return -ERANGE; 459 460 dout(" get_auth_session_key\n"); 461 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY); 462 463 /* encrypt and hash */ 464 get_random_bytes(&auth->client_challenge, sizeof(u64)); 465 blob->client_challenge = auth->client_challenge; 466 blob->server_challenge = cpu_to_le64(xi->server_challenge); 467 ret = ceph_x_encrypt(&xi->secret, enc_buf, CEPHX_AU_ENC_BUF_LEN, 468 sizeof(*blob)); 469 if (ret < 0) 470 return ret; 471 472 auth->struct_v = 1; 473 auth->key = 0; 474 for (u = (u64 *)enc_buf; u + 1 <= (u64 *)(enc_buf + ret); u++) 475 auth->key ^= *(__le64 *)u; 476 dout(" server_challenge %llx client_challenge %llx key %llx\n", 477 xi->server_challenge, le64_to_cpu(auth->client_challenge), 478 le64_to_cpu(auth->key)); 479 480 /* now encode the old ticket if exists */ 481 ret = ceph_x_encode_ticket(th, &p, end); 482 if (ret < 0) 483 return ret; 484 485 return p - buf; 486 } 487 488 if (need) { 489 void *p = head + 1; 490 struct ceph_x_service_ticket_request *req; 491 492 if (p > end) 493 return -ERANGE; 494 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY); 495 496 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer); 497 if (ret) 498 return ret; 499 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base, 500 xi->auth_authorizer.buf->vec.iov_len); 501 502 req = p; 503 req->keys = cpu_to_le32(need); 504 p += sizeof(*req); 505 return p - buf; 506 } 507 508 return 0; 509 } 510 511 static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result, 512 void *buf, void *end) 513 { 514 struct ceph_x_info *xi = ac->private; 515 struct ceph_x_reply_header *head = buf; 516 struct ceph_x_ticket_handler *th; 517 int len = end - buf; 518 int op; 519 int ret; 520 521 if (result) 522 return result; /* XXX hmm? */ 523 524 if (xi->starting) { 525 /* it's a hello */ 526 struct ceph_x_server_challenge *sc = buf; 527 528 if (len != sizeof(*sc)) 529 return -EINVAL; 530 xi->server_challenge = le64_to_cpu(sc->server_challenge); 531 dout("handle_reply got server challenge %llx\n", 532 xi->server_challenge); 533 xi->starting = false; 534 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH; 535 return -EAGAIN; 536 } 537 538 op = le16_to_cpu(head->op); 539 result = le32_to_cpu(head->result); 540 dout("handle_reply op %d result %d\n", op, result); 541 switch (op) { 542 case CEPHX_GET_AUTH_SESSION_KEY: 543 /* verify auth key */ 544 ret = ceph_x_proc_ticket_reply(ac, &xi->secret, 545 buf + sizeof(*head), end); 546 break; 547 548 case CEPHX_GET_PRINCIPAL_SESSION_KEY: 549 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); 550 if (IS_ERR(th)) 551 return PTR_ERR(th); 552 ret = ceph_x_proc_ticket_reply(ac, &th->session_key, 553 buf + sizeof(*head), end); 554 break; 555 556 default: 557 return -EINVAL; 558 } 559 if (ret) 560 return ret; 561 if (ac->want_keys == xi->have_keys) 562 return 0; 563 return -EAGAIN; 564 } 565 566 static void ceph_x_destroy_authorizer(struct ceph_authorizer *a) 567 { 568 struct ceph_x_authorizer *au = (void *)a; 569 570 ceph_x_authorizer_cleanup(au); 571 kfree(au); 572 } 573 574 static int ceph_x_create_authorizer( 575 struct ceph_auth_client *ac, int peer_type, 576 struct ceph_auth_handshake *auth) 577 { 578 struct ceph_x_authorizer *au; 579 struct ceph_x_ticket_handler *th; 580 int ret; 581 582 th = get_ticket_handler(ac, peer_type); 583 if (IS_ERR(th)) 584 return PTR_ERR(th); 585 586 au = kzalloc(sizeof(*au), GFP_NOFS); 587 if (!au) 588 return -ENOMEM; 589 590 au->base.destroy = ceph_x_destroy_authorizer; 591 592 ret = ceph_x_build_authorizer(ac, th, au); 593 if (ret) { 594 kfree(au); 595 return ret; 596 } 597 598 auth->authorizer = (struct ceph_authorizer *) au; 599 auth->authorizer_buf = au->buf->vec.iov_base; 600 auth->authorizer_buf_len = au->buf->vec.iov_len; 601 auth->authorizer_reply_buf = au->enc_buf; 602 auth->authorizer_reply_buf_len = CEPHX_AU_ENC_BUF_LEN; 603 auth->sign_message = ac->ops->sign_message; 604 auth->check_message_signature = ac->ops->check_message_signature; 605 606 return 0; 607 } 608 609 static int ceph_x_update_authorizer( 610 struct ceph_auth_client *ac, int peer_type, 611 struct ceph_auth_handshake *auth) 612 { 613 struct ceph_x_authorizer *au; 614 struct ceph_x_ticket_handler *th; 615 616 th = get_ticket_handler(ac, peer_type); 617 if (IS_ERR(th)) 618 return PTR_ERR(th); 619 620 au = (struct ceph_x_authorizer *)auth->authorizer; 621 if (au->secret_id < th->secret_id) { 622 dout("ceph_x_update_authorizer service %u secret %llu < %llu\n", 623 au->service, au->secret_id, th->secret_id); 624 return ceph_x_build_authorizer(ac, th, au); 625 } 626 return 0; 627 } 628 629 static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac, 630 struct ceph_authorizer *a) 631 { 632 struct ceph_x_authorizer *au = (void *)a; 633 void *p = au->enc_buf; 634 struct ceph_x_authorize_reply *reply = p + ceph_x_encrypt_offset(); 635 int ret; 636 637 ret = ceph_x_decrypt(&au->session_key, &p, p + CEPHX_AU_ENC_BUF_LEN); 638 if (ret < 0) 639 return ret; 640 if (ret != sizeof(*reply)) 641 return -EPERM; 642 643 if (au->nonce + 1 != le64_to_cpu(reply->nonce_plus_one)) 644 ret = -EPERM; 645 else 646 ret = 0; 647 dout("verify_authorizer_reply nonce %llx got %llx ret %d\n", 648 au->nonce, le64_to_cpu(reply->nonce_plus_one), ret); 649 return ret; 650 } 651 652 static void ceph_x_reset(struct ceph_auth_client *ac) 653 { 654 struct ceph_x_info *xi = ac->private; 655 656 dout("reset\n"); 657 xi->starting = true; 658 xi->server_challenge = 0; 659 } 660 661 static void ceph_x_destroy(struct ceph_auth_client *ac) 662 { 663 struct ceph_x_info *xi = ac->private; 664 struct rb_node *p; 665 666 dout("ceph_x_destroy %p\n", ac); 667 ceph_crypto_key_destroy(&xi->secret); 668 669 while ((p = rb_first(&xi->ticket_handlers)) != NULL) { 670 struct ceph_x_ticket_handler *th = 671 rb_entry(p, struct ceph_x_ticket_handler, node); 672 remove_ticket_handler(ac, th); 673 } 674 675 ceph_x_authorizer_cleanup(&xi->auth_authorizer); 676 677 kfree(ac->private); 678 ac->private = NULL; 679 } 680 681 static void invalidate_ticket(struct ceph_auth_client *ac, int peer_type) 682 { 683 struct ceph_x_ticket_handler *th; 684 685 th = get_ticket_handler(ac, peer_type); 686 if (!IS_ERR(th)) 687 th->have_key = false; 688 } 689 690 static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac, 691 int peer_type) 692 { 693 /* 694 * We are to invalidate a service ticket in the hopes of 695 * getting a new, hopefully more valid, one. But, we won't get 696 * it unless our AUTH ticket is good, so invalidate AUTH ticket 697 * as well, just in case. 698 */ 699 invalidate_ticket(ac, peer_type); 700 invalidate_ticket(ac, CEPH_ENTITY_TYPE_AUTH); 701 } 702 703 static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg, 704 __le64 *psig) 705 { 706 void *enc_buf = au->enc_buf; 707 struct { 708 __le32 len; 709 __le32 header_crc; 710 __le32 front_crc; 711 __le32 middle_crc; 712 __le32 data_crc; 713 } __packed *sigblock = enc_buf + ceph_x_encrypt_offset(); 714 int ret; 715 716 sigblock->len = cpu_to_le32(4*sizeof(u32)); 717 sigblock->header_crc = msg->hdr.crc; 718 sigblock->front_crc = msg->footer.front_crc; 719 sigblock->middle_crc = msg->footer.middle_crc; 720 sigblock->data_crc = msg->footer.data_crc; 721 ret = ceph_x_encrypt(&au->session_key, enc_buf, CEPHX_AU_ENC_BUF_LEN, 722 sizeof(*sigblock)); 723 if (ret < 0) 724 return ret; 725 726 *psig = *(__le64 *)(enc_buf + sizeof(u32)); 727 return 0; 728 } 729 730 static int ceph_x_sign_message(struct ceph_auth_handshake *auth, 731 struct ceph_msg *msg) 732 { 733 __le64 sig; 734 int ret; 735 736 if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN)) 737 return 0; 738 739 ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer, 740 msg, &sig); 741 if (ret) 742 return ret; 743 744 msg->footer.sig = sig; 745 msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED; 746 return 0; 747 } 748 749 static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth, 750 struct ceph_msg *msg) 751 { 752 __le64 sig_check; 753 int ret; 754 755 if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN)) 756 return 0; 757 758 ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer, 759 msg, &sig_check); 760 if (ret) 761 return ret; 762 if (sig_check == msg->footer.sig) 763 return 0; 764 if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED) 765 dout("ceph_x_check_message_signature %p has signature %llx " 766 "expect %llx\n", msg, msg->footer.sig, sig_check); 767 else 768 dout("ceph_x_check_message_signature %p sender did not set " 769 "CEPH_MSG_FOOTER_SIGNED\n", msg); 770 return -EBADMSG; 771 } 772 773 static const struct ceph_auth_client_ops ceph_x_ops = { 774 .name = "x", 775 .is_authenticated = ceph_x_is_authenticated, 776 .should_authenticate = ceph_x_should_authenticate, 777 .build_request = ceph_x_build_request, 778 .handle_reply = ceph_x_handle_reply, 779 .create_authorizer = ceph_x_create_authorizer, 780 .update_authorizer = ceph_x_update_authorizer, 781 .verify_authorizer_reply = ceph_x_verify_authorizer_reply, 782 .invalidate_authorizer = ceph_x_invalidate_authorizer, 783 .reset = ceph_x_reset, 784 .destroy = ceph_x_destroy, 785 .sign_message = ceph_x_sign_message, 786 .check_message_signature = ceph_x_check_message_signature, 787 }; 788 789 790 int ceph_x_init(struct ceph_auth_client *ac) 791 { 792 struct ceph_x_info *xi; 793 int ret; 794 795 dout("ceph_x_init %p\n", ac); 796 ret = -ENOMEM; 797 xi = kzalloc(sizeof(*xi), GFP_NOFS); 798 if (!xi) 799 goto out; 800 801 ret = -EINVAL; 802 if (!ac->key) { 803 pr_err("no secret set (for auth_x protocol)\n"); 804 goto out_nomem; 805 } 806 807 ret = ceph_crypto_key_clone(&xi->secret, ac->key); 808 if (ret < 0) { 809 pr_err("cannot clone key: %d\n", ret); 810 goto out_nomem; 811 } 812 813 xi->starting = true; 814 xi->ticket_handlers = RB_ROOT; 815 816 ac->protocol = CEPH_AUTH_CEPHX; 817 ac->private = xi; 818 ac->ops = &ceph_x_ops; 819 return 0; 820 821 out_nomem: 822 kfree(xi); 823 out: 824 return ret; 825 } 826 827 828