1 2 #include <linux/ceph/ceph_debug.h> 3 4 #include <linux/err.h> 5 #include <linux/module.h> 6 #include <linux/random.h> 7 #include <linux/slab.h> 8 9 #include <linux/ceph/decode.h> 10 #include <linux/ceph/auth.h> 11 #include <linux/ceph/libceph.h> 12 #include <linux/ceph/messenger.h> 13 14 #include "crypto.h" 15 #include "auth_x.h" 16 #include "auth_x_protocol.h" 17 18 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed); 19 20 static int ceph_x_is_authenticated(struct ceph_auth_client *ac) 21 { 22 struct ceph_x_info *xi = ac->private; 23 int need; 24 25 ceph_x_validate_tickets(ac, &need); 26 dout("ceph_x_is_authenticated want=%d need=%d have=%d\n", 27 ac->want_keys, need, xi->have_keys); 28 return (ac->want_keys & xi->have_keys) == ac->want_keys; 29 } 30 31 static int ceph_x_should_authenticate(struct ceph_auth_client *ac) 32 { 33 struct ceph_x_info *xi = ac->private; 34 int need; 35 36 ceph_x_validate_tickets(ac, &need); 37 dout("ceph_x_should_authenticate want=%d need=%d have=%d\n", 38 ac->want_keys, need, xi->have_keys); 39 return need != 0; 40 } 41 42 static int ceph_x_encrypt_offset(void) 43 { 44 return sizeof(u32) + sizeof(struct ceph_x_encrypt_header); 45 } 46 47 static int ceph_x_encrypt_buflen(int ilen) 48 { 49 return ceph_x_encrypt_offset() + ilen + 16; 50 } 51 52 static int ceph_x_encrypt(struct ceph_crypto_key *secret, void *buf, 53 int buf_len, int plaintext_len) 54 { 55 struct ceph_x_encrypt_header *hdr = buf + sizeof(u32); 56 int ciphertext_len; 57 int ret; 58 59 hdr->struct_v = 1; 60 hdr->magic = cpu_to_le64(CEPHX_ENC_MAGIC); 61 62 ret = ceph_crypt(secret, true, buf + sizeof(u32), buf_len - sizeof(u32), 63 plaintext_len + sizeof(struct ceph_x_encrypt_header), 64 &ciphertext_len); 65 if (ret) 66 return ret; 67 68 ceph_encode_32(&buf, ciphertext_len); 69 return sizeof(u32) + ciphertext_len; 70 } 71 72 static int ceph_x_decrypt(struct ceph_crypto_key *secret, void **p, void *end) 73 { 74 struct ceph_x_encrypt_header *hdr = *p + sizeof(u32); 75 int ciphertext_len, plaintext_len; 76 int ret; 77 78 ceph_decode_32_safe(p, end, ciphertext_len, e_inval); 79 ceph_decode_need(p, end, ciphertext_len, e_inval); 80 81 ret = ceph_crypt(secret, false, *p, end - *p, ciphertext_len, 82 &plaintext_len); 83 if (ret) 84 return ret; 85 86 if (hdr->struct_v != 1 || le64_to_cpu(hdr->magic) != CEPHX_ENC_MAGIC) 87 return -EPERM; 88 89 *p += ciphertext_len; 90 return plaintext_len - sizeof(struct ceph_x_encrypt_header); 91 92 e_inval: 93 return -EINVAL; 94 } 95 96 /* 97 * get existing (or insert new) ticket handler 98 */ 99 static struct ceph_x_ticket_handler * 100 get_ticket_handler(struct ceph_auth_client *ac, int service) 101 { 102 struct ceph_x_ticket_handler *th; 103 struct ceph_x_info *xi = ac->private; 104 struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node; 105 106 while (*p) { 107 parent = *p; 108 th = rb_entry(parent, struct ceph_x_ticket_handler, node); 109 if (service < th->service) 110 p = &(*p)->rb_left; 111 else if (service > th->service) 112 p = &(*p)->rb_right; 113 else 114 return th; 115 } 116 117 /* add it */ 118 th = kzalloc(sizeof(*th), GFP_NOFS); 119 if (!th) 120 return ERR_PTR(-ENOMEM); 121 th->service = service; 122 rb_link_node(&th->node, parent, p); 123 rb_insert_color(&th->node, &xi->ticket_handlers); 124 return th; 125 } 126 127 static void remove_ticket_handler(struct ceph_auth_client *ac, 128 struct ceph_x_ticket_handler *th) 129 { 130 struct ceph_x_info *xi = ac->private; 131 132 dout("remove_ticket_handler %p %d\n", th, th->service); 133 rb_erase(&th->node, &xi->ticket_handlers); 134 ceph_crypto_key_destroy(&th->session_key); 135 if (th->ticket_blob) 136 ceph_buffer_put(th->ticket_blob); 137 kfree(th); 138 } 139 140 static int process_one_ticket(struct ceph_auth_client *ac, 141 struct ceph_crypto_key *secret, 142 void **p, void *end) 143 { 144 struct ceph_x_info *xi = ac->private; 145 int type; 146 u8 tkt_struct_v, blob_struct_v; 147 struct ceph_x_ticket_handler *th; 148 void *dp, *dend; 149 int dlen; 150 char is_enc; 151 struct timespec validity; 152 void *tp, *tpend; 153 void **ptp; 154 struct ceph_crypto_key new_session_key; 155 struct ceph_buffer *new_ticket_blob; 156 unsigned long new_expires, new_renew_after; 157 u64 new_secret_id; 158 int ret; 159 160 ceph_decode_need(p, end, sizeof(u32) + 1, bad); 161 162 type = ceph_decode_32(p); 163 dout(" ticket type %d %s\n", type, ceph_entity_type_name(type)); 164 165 tkt_struct_v = ceph_decode_8(p); 166 if (tkt_struct_v != 1) 167 goto bad; 168 169 th = get_ticket_handler(ac, type); 170 if (IS_ERR(th)) { 171 ret = PTR_ERR(th); 172 goto out; 173 } 174 175 /* blob for me */ 176 dp = *p + ceph_x_encrypt_offset(); 177 ret = ceph_x_decrypt(secret, p, end); 178 if (ret < 0) 179 goto out; 180 dout(" decrypted %d bytes\n", ret); 181 dend = dp + ret; 182 183 tkt_struct_v = ceph_decode_8(&dp); 184 if (tkt_struct_v != 1) 185 goto bad; 186 187 ret = ceph_crypto_key_decode(&new_session_key, &dp, dend); 188 if (ret) 189 goto out; 190 191 ceph_decode_timespec(&validity, dp); 192 dp += sizeof(struct ceph_timespec); 193 new_expires = get_seconds() + validity.tv_sec; 194 new_renew_after = new_expires - (validity.tv_sec / 4); 195 dout(" expires=%lu renew_after=%lu\n", new_expires, 196 new_renew_after); 197 198 /* ticket blob for service */ 199 ceph_decode_8_safe(p, end, is_enc, bad); 200 if (is_enc) { 201 /* encrypted */ 202 tp = *p + ceph_x_encrypt_offset(); 203 ret = ceph_x_decrypt(&th->session_key, p, end); 204 if (ret < 0) 205 goto out; 206 dout(" encrypted ticket, decrypted %d bytes\n", ret); 207 ptp = &tp; 208 tpend = tp + ret; 209 } else { 210 /* unencrypted */ 211 ptp = p; 212 tpend = end; 213 } 214 ceph_decode_32_safe(ptp, tpend, dlen, bad); 215 dout(" ticket blob is %d bytes\n", dlen); 216 ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad); 217 blob_struct_v = ceph_decode_8(ptp); 218 new_secret_id = ceph_decode_64(ptp); 219 ret = ceph_decode_buffer(&new_ticket_blob, ptp, tpend); 220 if (ret) 221 goto out; 222 223 /* all is well, update our ticket */ 224 ceph_crypto_key_destroy(&th->session_key); 225 if (th->ticket_blob) 226 ceph_buffer_put(th->ticket_blob); 227 th->session_key = new_session_key; 228 th->ticket_blob = new_ticket_blob; 229 th->secret_id = new_secret_id; 230 th->expires = new_expires; 231 th->renew_after = new_renew_after; 232 th->have_key = true; 233 dout(" got ticket service %d (%s) secret_id %lld len %d\n", 234 type, ceph_entity_type_name(type), th->secret_id, 235 (int)th->ticket_blob->vec.iov_len); 236 xi->have_keys |= th->service; 237 238 out: 239 return ret; 240 241 bad: 242 ret = -EINVAL; 243 goto out; 244 } 245 246 static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac, 247 struct ceph_crypto_key *secret, 248 void *buf, void *end) 249 { 250 void *p = buf; 251 u8 reply_struct_v; 252 u32 num; 253 int ret; 254 255 ceph_decode_8_safe(&p, end, reply_struct_v, bad); 256 if (reply_struct_v != 1) 257 return -EINVAL; 258 259 ceph_decode_32_safe(&p, end, num, bad); 260 dout("%d tickets\n", num); 261 262 while (num--) { 263 ret = process_one_ticket(ac, secret, &p, end); 264 if (ret) 265 return ret; 266 } 267 268 return 0; 269 270 bad: 271 return -EINVAL; 272 } 273 274 static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au) 275 { 276 ceph_crypto_key_destroy(&au->session_key); 277 if (au->buf) { 278 ceph_buffer_put(au->buf); 279 au->buf = NULL; 280 } 281 } 282 283 static int ceph_x_build_authorizer(struct ceph_auth_client *ac, 284 struct ceph_x_ticket_handler *th, 285 struct ceph_x_authorizer *au) 286 { 287 int maxlen; 288 struct ceph_x_authorize_a *msg_a; 289 struct ceph_x_authorize_b *msg_b; 290 void *p, *end; 291 int ret; 292 int ticket_blob_len = 293 (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0); 294 295 dout("build_authorizer for %s %p\n", 296 ceph_entity_type_name(th->service), au); 297 298 ceph_crypto_key_destroy(&au->session_key); 299 ret = ceph_crypto_key_clone(&au->session_key, &th->session_key); 300 if (ret) 301 goto out_au; 302 303 maxlen = sizeof(*msg_a) + ticket_blob_len + 304 ceph_x_encrypt_buflen(sizeof(*msg_b)); 305 dout(" need len %d\n", maxlen); 306 if (au->buf && au->buf->alloc_len < maxlen) { 307 ceph_buffer_put(au->buf); 308 au->buf = NULL; 309 } 310 if (!au->buf) { 311 au->buf = ceph_buffer_new(maxlen, GFP_NOFS); 312 if (!au->buf) { 313 ret = -ENOMEM; 314 goto out_au; 315 } 316 } 317 au->service = th->service; 318 au->secret_id = th->secret_id; 319 320 msg_a = au->buf->vec.iov_base; 321 msg_a->struct_v = 1; 322 msg_a->global_id = cpu_to_le64(ac->global_id); 323 msg_a->service_id = cpu_to_le32(th->service); 324 msg_a->ticket_blob.struct_v = 1; 325 msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id); 326 msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len); 327 if (ticket_blob_len) { 328 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base, 329 th->ticket_blob->vec.iov_len); 330 } 331 dout(" th %p secret_id %lld %lld\n", th, th->secret_id, 332 le64_to_cpu(msg_a->ticket_blob.secret_id)); 333 334 p = msg_a + 1; 335 p += ticket_blob_len; 336 end = au->buf->vec.iov_base + au->buf->vec.iov_len; 337 338 msg_b = p + ceph_x_encrypt_offset(); 339 msg_b->struct_v = 1; 340 get_random_bytes(&au->nonce, sizeof(au->nonce)); 341 msg_b->nonce = cpu_to_le64(au->nonce); 342 ret = ceph_x_encrypt(&au->session_key, p, end - p, sizeof(*msg_b)); 343 if (ret < 0) 344 goto out_au; 345 346 p += ret; 347 WARN_ON(p > end); 348 au->buf->vec.iov_len = p - au->buf->vec.iov_base; 349 dout(" built authorizer nonce %llx len %d\n", au->nonce, 350 (int)au->buf->vec.iov_len); 351 return 0; 352 353 out_au: 354 ceph_x_authorizer_cleanup(au); 355 return ret; 356 } 357 358 static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th, 359 void **p, void *end) 360 { 361 ceph_decode_need(p, end, 1 + sizeof(u64), bad); 362 ceph_encode_8(p, 1); 363 ceph_encode_64(p, th->secret_id); 364 if (th->ticket_blob) { 365 const char *buf = th->ticket_blob->vec.iov_base; 366 u32 len = th->ticket_blob->vec.iov_len; 367 368 ceph_encode_32_safe(p, end, len, bad); 369 ceph_encode_copy_safe(p, end, buf, len, bad); 370 } else { 371 ceph_encode_32_safe(p, end, 0, bad); 372 } 373 374 return 0; 375 bad: 376 return -ERANGE; 377 } 378 379 static bool need_key(struct ceph_x_ticket_handler *th) 380 { 381 if (!th->have_key) 382 return true; 383 384 return get_seconds() >= th->renew_after; 385 } 386 387 static bool have_key(struct ceph_x_ticket_handler *th) 388 { 389 if (th->have_key) { 390 if (get_seconds() >= th->expires) 391 th->have_key = false; 392 } 393 394 return th->have_key; 395 } 396 397 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed) 398 { 399 int want = ac->want_keys; 400 struct ceph_x_info *xi = ac->private; 401 int service; 402 403 *pneed = ac->want_keys & ~(xi->have_keys); 404 405 for (service = 1; service <= want; service <<= 1) { 406 struct ceph_x_ticket_handler *th; 407 408 if (!(ac->want_keys & service)) 409 continue; 410 411 if (*pneed & service) 412 continue; 413 414 th = get_ticket_handler(ac, service); 415 if (IS_ERR(th)) { 416 *pneed |= service; 417 continue; 418 } 419 420 if (need_key(th)) 421 *pneed |= service; 422 if (!have_key(th)) 423 xi->have_keys &= ~service; 424 } 425 } 426 427 static int ceph_x_build_request(struct ceph_auth_client *ac, 428 void *buf, void *end) 429 { 430 struct ceph_x_info *xi = ac->private; 431 int need; 432 struct ceph_x_request_header *head = buf; 433 int ret; 434 struct ceph_x_ticket_handler *th = 435 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); 436 437 if (IS_ERR(th)) 438 return PTR_ERR(th); 439 440 ceph_x_validate_tickets(ac, &need); 441 442 dout("build_request want %x have %x need %x\n", 443 ac->want_keys, xi->have_keys, need); 444 445 if (need & CEPH_ENTITY_TYPE_AUTH) { 446 struct ceph_x_authenticate *auth = (void *)(head + 1); 447 void *p = auth + 1; 448 void *enc_buf = xi->auth_authorizer.enc_buf; 449 struct ceph_x_challenge_blob *blob = enc_buf + 450 ceph_x_encrypt_offset(); 451 u64 *u; 452 453 if (p > end) 454 return -ERANGE; 455 456 dout(" get_auth_session_key\n"); 457 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY); 458 459 /* encrypt and hash */ 460 get_random_bytes(&auth->client_challenge, sizeof(u64)); 461 blob->client_challenge = auth->client_challenge; 462 blob->server_challenge = cpu_to_le64(xi->server_challenge); 463 ret = ceph_x_encrypt(&xi->secret, enc_buf, CEPHX_AU_ENC_BUF_LEN, 464 sizeof(*blob)); 465 if (ret < 0) 466 return ret; 467 468 auth->struct_v = 1; 469 auth->key = 0; 470 for (u = (u64 *)enc_buf; u + 1 <= (u64 *)(enc_buf + ret); u++) 471 auth->key ^= *(__le64 *)u; 472 dout(" server_challenge %llx client_challenge %llx key %llx\n", 473 xi->server_challenge, le64_to_cpu(auth->client_challenge), 474 le64_to_cpu(auth->key)); 475 476 /* now encode the old ticket if exists */ 477 ret = ceph_x_encode_ticket(th, &p, end); 478 if (ret < 0) 479 return ret; 480 481 return p - buf; 482 } 483 484 if (need) { 485 void *p = head + 1; 486 struct ceph_x_service_ticket_request *req; 487 488 if (p > end) 489 return -ERANGE; 490 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY); 491 492 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer); 493 if (ret) 494 return ret; 495 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base, 496 xi->auth_authorizer.buf->vec.iov_len); 497 498 req = p; 499 req->keys = cpu_to_le32(need); 500 p += sizeof(*req); 501 return p - buf; 502 } 503 504 return 0; 505 } 506 507 static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result, 508 void *buf, void *end) 509 { 510 struct ceph_x_info *xi = ac->private; 511 struct ceph_x_reply_header *head = buf; 512 struct ceph_x_ticket_handler *th; 513 int len = end - buf; 514 int op; 515 int ret; 516 517 if (result) 518 return result; /* XXX hmm? */ 519 520 if (xi->starting) { 521 /* it's a hello */ 522 struct ceph_x_server_challenge *sc = buf; 523 524 if (len != sizeof(*sc)) 525 return -EINVAL; 526 xi->server_challenge = le64_to_cpu(sc->server_challenge); 527 dout("handle_reply got server challenge %llx\n", 528 xi->server_challenge); 529 xi->starting = false; 530 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH; 531 return -EAGAIN; 532 } 533 534 op = le16_to_cpu(head->op); 535 result = le32_to_cpu(head->result); 536 dout("handle_reply op %d result %d\n", op, result); 537 switch (op) { 538 case CEPHX_GET_AUTH_SESSION_KEY: 539 /* verify auth key */ 540 ret = ceph_x_proc_ticket_reply(ac, &xi->secret, 541 buf + sizeof(*head), end); 542 break; 543 544 case CEPHX_GET_PRINCIPAL_SESSION_KEY: 545 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); 546 if (IS_ERR(th)) 547 return PTR_ERR(th); 548 ret = ceph_x_proc_ticket_reply(ac, &th->session_key, 549 buf + sizeof(*head), end); 550 break; 551 552 default: 553 return -EINVAL; 554 } 555 if (ret) 556 return ret; 557 if (ac->want_keys == xi->have_keys) 558 return 0; 559 return -EAGAIN; 560 } 561 562 static void ceph_x_destroy_authorizer(struct ceph_authorizer *a) 563 { 564 struct ceph_x_authorizer *au = (void *)a; 565 566 ceph_x_authorizer_cleanup(au); 567 kfree(au); 568 } 569 570 static int ceph_x_create_authorizer( 571 struct ceph_auth_client *ac, int peer_type, 572 struct ceph_auth_handshake *auth) 573 { 574 struct ceph_x_authorizer *au; 575 struct ceph_x_ticket_handler *th; 576 int ret; 577 578 th = get_ticket_handler(ac, peer_type); 579 if (IS_ERR(th)) 580 return PTR_ERR(th); 581 582 au = kzalloc(sizeof(*au), GFP_NOFS); 583 if (!au) 584 return -ENOMEM; 585 586 au->base.destroy = ceph_x_destroy_authorizer; 587 588 ret = ceph_x_build_authorizer(ac, th, au); 589 if (ret) { 590 kfree(au); 591 return ret; 592 } 593 594 auth->authorizer = (struct ceph_authorizer *) au; 595 auth->authorizer_buf = au->buf->vec.iov_base; 596 auth->authorizer_buf_len = au->buf->vec.iov_len; 597 auth->authorizer_reply_buf = au->enc_buf; 598 auth->authorizer_reply_buf_len = CEPHX_AU_ENC_BUF_LEN; 599 auth->sign_message = ac->ops->sign_message; 600 auth->check_message_signature = ac->ops->check_message_signature; 601 602 return 0; 603 } 604 605 static int ceph_x_update_authorizer( 606 struct ceph_auth_client *ac, int peer_type, 607 struct ceph_auth_handshake *auth) 608 { 609 struct ceph_x_authorizer *au; 610 struct ceph_x_ticket_handler *th; 611 612 th = get_ticket_handler(ac, peer_type); 613 if (IS_ERR(th)) 614 return PTR_ERR(th); 615 616 au = (struct ceph_x_authorizer *)auth->authorizer; 617 if (au->secret_id < th->secret_id) { 618 dout("ceph_x_update_authorizer service %u secret %llu < %llu\n", 619 au->service, au->secret_id, th->secret_id); 620 return ceph_x_build_authorizer(ac, th, au); 621 } 622 return 0; 623 } 624 625 static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac, 626 struct ceph_authorizer *a) 627 { 628 struct ceph_x_authorizer *au = (void *)a; 629 void *p = au->enc_buf; 630 struct ceph_x_authorize_reply *reply = p + ceph_x_encrypt_offset(); 631 int ret; 632 633 ret = ceph_x_decrypt(&au->session_key, &p, p + CEPHX_AU_ENC_BUF_LEN); 634 if (ret < 0) 635 return ret; 636 if (ret != sizeof(*reply)) 637 return -EPERM; 638 639 if (au->nonce + 1 != le64_to_cpu(reply->nonce_plus_one)) 640 ret = -EPERM; 641 else 642 ret = 0; 643 dout("verify_authorizer_reply nonce %llx got %llx ret %d\n", 644 au->nonce, le64_to_cpu(reply->nonce_plus_one), ret); 645 return ret; 646 } 647 648 static void ceph_x_reset(struct ceph_auth_client *ac) 649 { 650 struct ceph_x_info *xi = ac->private; 651 652 dout("reset\n"); 653 xi->starting = true; 654 xi->server_challenge = 0; 655 } 656 657 static void ceph_x_destroy(struct ceph_auth_client *ac) 658 { 659 struct ceph_x_info *xi = ac->private; 660 struct rb_node *p; 661 662 dout("ceph_x_destroy %p\n", ac); 663 ceph_crypto_key_destroy(&xi->secret); 664 665 while ((p = rb_first(&xi->ticket_handlers)) != NULL) { 666 struct ceph_x_ticket_handler *th = 667 rb_entry(p, struct ceph_x_ticket_handler, node); 668 remove_ticket_handler(ac, th); 669 } 670 671 ceph_x_authorizer_cleanup(&xi->auth_authorizer); 672 673 kfree(ac->private); 674 ac->private = NULL; 675 } 676 677 static void invalidate_ticket(struct ceph_auth_client *ac, int peer_type) 678 { 679 struct ceph_x_ticket_handler *th; 680 681 th = get_ticket_handler(ac, peer_type); 682 if (!IS_ERR(th)) 683 th->have_key = false; 684 } 685 686 static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac, 687 int peer_type) 688 { 689 /* 690 * We are to invalidate a service ticket in the hopes of 691 * getting a new, hopefully more valid, one. But, we won't get 692 * it unless our AUTH ticket is good, so invalidate AUTH ticket 693 * as well, just in case. 694 */ 695 invalidate_ticket(ac, peer_type); 696 invalidate_ticket(ac, CEPH_ENTITY_TYPE_AUTH); 697 } 698 699 static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg, 700 __le64 *psig) 701 { 702 void *enc_buf = au->enc_buf; 703 struct { 704 __le32 len; 705 __le32 header_crc; 706 __le32 front_crc; 707 __le32 middle_crc; 708 __le32 data_crc; 709 } __packed *sigblock = enc_buf + ceph_x_encrypt_offset(); 710 int ret; 711 712 sigblock->len = cpu_to_le32(4*sizeof(u32)); 713 sigblock->header_crc = msg->hdr.crc; 714 sigblock->front_crc = msg->footer.front_crc; 715 sigblock->middle_crc = msg->footer.middle_crc; 716 sigblock->data_crc = msg->footer.data_crc; 717 ret = ceph_x_encrypt(&au->session_key, enc_buf, CEPHX_AU_ENC_BUF_LEN, 718 sizeof(*sigblock)); 719 if (ret < 0) 720 return ret; 721 722 *psig = *(__le64 *)(enc_buf + sizeof(u32)); 723 return 0; 724 } 725 726 static int ceph_x_sign_message(struct ceph_auth_handshake *auth, 727 struct ceph_msg *msg) 728 { 729 __le64 sig; 730 int ret; 731 732 if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN)) 733 return 0; 734 735 ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer, 736 msg, &sig); 737 if (ret) 738 return ret; 739 740 msg->footer.sig = sig; 741 msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED; 742 return 0; 743 } 744 745 static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth, 746 struct ceph_msg *msg) 747 { 748 __le64 sig_check; 749 int ret; 750 751 if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN)) 752 return 0; 753 754 ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer, 755 msg, &sig_check); 756 if (ret) 757 return ret; 758 if (sig_check == msg->footer.sig) 759 return 0; 760 if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED) 761 dout("ceph_x_check_message_signature %p has signature %llx " 762 "expect %llx\n", msg, msg->footer.sig, sig_check); 763 else 764 dout("ceph_x_check_message_signature %p sender did not set " 765 "CEPH_MSG_FOOTER_SIGNED\n", msg); 766 return -EBADMSG; 767 } 768 769 static const struct ceph_auth_client_ops ceph_x_ops = { 770 .name = "x", 771 .is_authenticated = ceph_x_is_authenticated, 772 .should_authenticate = ceph_x_should_authenticate, 773 .build_request = ceph_x_build_request, 774 .handle_reply = ceph_x_handle_reply, 775 .create_authorizer = ceph_x_create_authorizer, 776 .update_authorizer = ceph_x_update_authorizer, 777 .verify_authorizer_reply = ceph_x_verify_authorizer_reply, 778 .invalidate_authorizer = ceph_x_invalidate_authorizer, 779 .reset = ceph_x_reset, 780 .destroy = ceph_x_destroy, 781 .sign_message = ceph_x_sign_message, 782 .check_message_signature = ceph_x_check_message_signature, 783 }; 784 785 786 int ceph_x_init(struct ceph_auth_client *ac) 787 { 788 struct ceph_x_info *xi; 789 int ret; 790 791 dout("ceph_x_init %p\n", ac); 792 ret = -ENOMEM; 793 xi = kzalloc(sizeof(*xi), GFP_NOFS); 794 if (!xi) 795 goto out; 796 797 ret = -EINVAL; 798 if (!ac->key) { 799 pr_err("no secret set (for auth_x protocol)\n"); 800 goto out_nomem; 801 } 802 803 ret = ceph_crypto_key_clone(&xi->secret, ac->key); 804 if (ret < 0) { 805 pr_err("cannot clone key: %d\n", ret); 806 goto out_nomem; 807 } 808 809 xi->starting = true; 810 xi->ticket_handlers = RB_ROOT; 811 812 ac->protocol = CEPH_AUTH_CEPHX; 813 ac->private = xi; 814 ac->ops = &ceph_x_ops; 815 return 0; 816 817 out_nomem: 818 kfree(xi); 819 out: 820 return ret; 821 } 822 823 824