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 = { 0 }; 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 if (blob_struct_v != 1) 219 goto bad; 220 221 new_secret_id = ceph_decode_64(ptp); 222 ret = ceph_decode_buffer(&new_ticket_blob, ptp, tpend); 223 if (ret) 224 goto out; 225 226 /* all is well, update our ticket */ 227 ceph_crypto_key_destroy(&th->session_key); 228 if (th->ticket_blob) 229 ceph_buffer_put(th->ticket_blob); 230 th->session_key = new_session_key; 231 th->ticket_blob = new_ticket_blob; 232 th->secret_id = new_secret_id; 233 th->expires = new_expires; 234 th->renew_after = new_renew_after; 235 th->have_key = true; 236 dout(" got ticket service %d (%s) secret_id %lld len %d\n", 237 type, ceph_entity_type_name(type), th->secret_id, 238 (int)th->ticket_blob->vec.iov_len); 239 xi->have_keys |= th->service; 240 return 0; 241 242 bad: 243 ret = -EINVAL; 244 out: 245 ceph_crypto_key_destroy(&new_session_key); 246 return ret; 247 } 248 249 static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac, 250 struct ceph_crypto_key *secret, 251 void *buf, void *end) 252 { 253 void *p = buf; 254 u8 reply_struct_v; 255 u32 num; 256 int ret; 257 258 ceph_decode_8_safe(&p, end, reply_struct_v, bad); 259 if (reply_struct_v != 1) 260 return -EINVAL; 261 262 ceph_decode_32_safe(&p, end, num, bad); 263 dout("%d tickets\n", num); 264 265 while (num--) { 266 ret = process_one_ticket(ac, secret, &p, end); 267 if (ret) 268 return ret; 269 } 270 271 return 0; 272 273 bad: 274 return -EINVAL; 275 } 276 277 static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au) 278 { 279 ceph_crypto_key_destroy(&au->session_key); 280 if (au->buf) { 281 ceph_buffer_put(au->buf); 282 au->buf = NULL; 283 } 284 } 285 286 static int ceph_x_build_authorizer(struct ceph_auth_client *ac, 287 struct ceph_x_ticket_handler *th, 288 struct ceph_x_authorizer *au) 289 { 290 int maxlen; 291 struct ceph_x_authorize_a *msg_a; 292 struct ceph_x_authorize_b *msg_b; 293 void *p, *end; 294 int ret; 295 int ticket_blob_len = 296 (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0); 297 298 dout("build_authorizer for %s %p\n", 299 ceph_entity_type_name(th->service), au); 300 301 ceph_crypto_key_destroy(&au->session_key); 302 ret = ceph_crypto_key_clone(&au->session_key, &th->session_key); 303 if (ret) 304 goto out_au; 305 306 maxlen = sizeof(*msg_a) + ticket_blob_len + 307 ceph_x_encrypt_buflen(sizeof(*msg_b)); 308 dout(" need len %d\n", maxlen); 309 if (au->buf && au->buf->alloc_len < maxlen) { 310 ceph_buffer_put(au->buf); 311 au->buf = NULL; 312 } 313 if (!au->buf) { 314 au->buf = ceph_buffer_new(maxlen, GFP_NOFS); 315 if (!au->buf) { 316 ret = -ENOMEM; 317 goto out_au; 318 } 319 } 320 au->service = th->service; 321 au->secret_id = th->secret_id; 322 323 msg_a = au->buf->vec.iov_base; 324 msg_a->struct_v = 1; 325 msg_a->global_id = cpu_to_le64(ac->global_id); 326 msg_a->service_id = cpu_to_le32(th->service); 327 msg_a->ticket_blob.struct_v = 1; 328 msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id); 329 msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len); 330 if (ticket_blob_len) { 331 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base, 332 th->ticket_blob->vec.iov_len); 333 } 334 dout(" th %p secret_id %lld %lld\n", th, th->secret_id, 335 le64_to_cpu(msg_a->ticket_blob.secret_id)); 336 337 p = msg_a + 1; 338 p += ticket_blob_len; 339 end = au->buf->vec.iov_base + au->buf->vec.iov_len; 340 341 msg_b = p + ceph_x_encrypt_offset(); 342 msg_b->struct_v = 1; 343 get_random_bytes(&au->nonce, sizeof(au->nonce)); 344 msg_b->nonce = cpu_to_le64(au->nonce); 345 ret = ceph_x_encrypt(&au->session_key, p, end - p, sizeof(*msg_b)); 346 if (ret < 0) 347 goto out_au; 348 349 p += ret; 350 WARN_ON(p > end); 351 au->buf->vec.iov_len = p - au->buf->vec.iov_base; 352 dout(" built authorizer nonce %llx len %d\n", au->nonce, 353 (int)au->buf->vec.iov_len); 354 return 0; 355 356 out_au: 357 ceph_x_authorizer_cleanup(au); 358 return ret; 359 } 360 361 static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th, 362 void **p, void *end) 363 { 364 ceph_decode_need(p, end, 1 + sizeof(u64), bad); 365 ceph_encode_8(p, 1); 366 ceph_encode_64(p, th->secret_id); 367 if (th->ticket_blob) { 368 const char *buf = th->ticket_blob->vec.iov_base; 369 u32 len = th->ticket_blob->vec.iov_len; 370 371 ceph_encode_32_safe(p, end, len, bad); 372 ceph_encode_copy_safe(p, end, buf, len, bad); 373 } else { 374 ceph_encode_32_safe(p, end, 0, bad); 375 } 376 377 return 0; 378 bad: 379 return -ERANGE; 380 } 381 382 static bool need_key(struct ceph_x_ticket_handler *th) 383 { 384 if (!th->have_key) 385 return true; 386 387 return get_seconds() >= th->renew_after; 388 } 389 390 static bool have_key(struct ceph_x_ticket_handler *th) 391 { 392 if (th->have_key) { 393 if (get_seconds() >= th->expires) 394 th->have_key = false; 395 } 396 397 return th->have_key; 398 } 399 400 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed) 401 { 402 int want = ac->want_keys; 403 struct ceph_x_info *xi = ac->private; 404 int service; 405 406 *pneed = ac->want_keys & ~(xi->have_keys); 407 408 for (service = 1; service <= want; service <<= 1) { 409 struct ceph_x_ticket_handler *th; 410 411 if (!(ac->want_keys & service)) 412 continue; 413 414 if (*pneed & service) 415 continue; 416 417 th = get_ticket_handler(ac, service); 418 if (IS_ERR(th)) { 419 *pneed |= service; 420 continue; 421 } 422 423 if (need_key(th)) 424 *pneed |= service; 425 if (!have_key(th)) 426 xi->have_keys &= ~service; 427 } 428 } 429 430 static int ceph_x_build_request(struct ceph_auth_client *ac, 431 void *buf, void *end) 432 { 433 struct ceph_x_info *xi = ac->private; 434 int need; 435 struct ceph_x_request_header *head = buf; 436 int ret; 437 struct ceph_x_ticket_handler *th = 438 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); 439 440 if (IS_ERR(th)) 441 return PTR_ERR(th); 442 443 ceph_x_validate_tickets(ac, &need); 444 445 dout("build_request want %x have %x need %x\n", 446 ac->want_keys, xi->have_keys, need); 447 448 if (need & CEPH_ENTITY_TYPE_AUTH) { 449 struct ceph_x_authenticate *auth = (void *)(head + 1); 450 void *p = auth + 1; 451 void *enc_buf = xi->auth_authorizer.enc_buf; 452 struct ceph_x_challenge_blob *blob = enc_buf + 453 ceph_x_encrypt_offset(); 454 u64 *u; 455 456 if (p > end) 457 return -ERANGE; 458 459 dout(" get_auth_session_key\n"); 460 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY); 461 462 /* encrypt and hash */ 463 get_random_bytes(&auth->client_challenge, sizeof(u64)); 464 blob->client_challenge = auth->client_challenge; 465 blob->server_challenge = cpu_to_le64(xi->server_challenge); 466 ret = ceph_x_encrypt(&xi->secret, enc_buf, CEPHX_AU_ENC_BUF_LEN, 467 sizeof(*blob)); 468 if (ret < 0) 469 return ret; 470 471 auth->struct_v = 1; 472 auth->key = 0; 473 for (u = (u64 *)enc_buf; u + 1 <= (u64 *)(enc_buf + ret); u++) 474 auth->key ^= *(__le64 *)u; 475 dout(" server_challenge %llx client_challenge %llx key %llx\n", 476 xi->server_challenge, le64_to_cpu(auth->client_challenge), 477 le64_to_cpu(auth->key)); 478 479 /* now encode the old ticket if exists */ 480 ret = ceph_x_encode_ticket(th, &p, end); 481 if (ret < 0) 482 return ret; 483 484 return p - buf; 485 } 486 487 if (need) { 488 void *p = head + 1; 489 struct ceph_x_service_ticket_request *req; 490 491 if (p > end) 492 return -ERANGE; 493 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY); 494 495 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer); 496 if (ret) 497 return ret; 498 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base, 499 xi->auth_authorizer.buf->vec.iov_len); 500 501 req = p; 502 req->keys = cpu_to_le32(need); 503 p += sizeof(*req); 504 return p - buf; 505 } 506 507 return 0; 508 } 509 510 static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result, 511 void *buf, void *end) 512 { 513 struct ceph_x_info *xi = ac->private; 514 struct ceph_x_reply_header *head = buf; 515 struct ceph_x_ticket_handler *th; 516 int len = end - buf; 517 int op; 518 int ret; 519 520 if (result) 521 return result; /* XXX hmm? */ 522 523 if (xi->starting) { 524 /* it's a hello */ 525 struct ceph_x_server_challenge *sc = buf; 526 527 if (len != sizeof(*sc)) 528 return -EINVAL; 529 xi->server_challenge = le64_to_cpu(sc->server_challenge); 530 dout("handle_reply got server challenge %llx\n", 531 xi->server_challenge); 532 xi->starting = false; 533 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH; 534 return -EAGAIN; 535 } 536 537 op = le16_to_cpu(head->op); 538 result = le32_to_cpu(head->result); 539 dout("handle_reply op %d result %d\n", op, result); 540 switch (op) { 541 case CEPHX_GET_AUTH_SESSION_KEY: 542 /* verify auth key */ 543 ret = ceph_x_proc_ticket_reply(ac, &xi->secret, 544 buf + sizeof(*head), end); 545 break; 546 547 case CEPHX_GET_PRINCIPAL_SESSION_KEY: 548 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); 549 if (IS_ERR(th)) 550 return PTR_ERR(th); 551 ret = ceph_x_proc_ticket_reply(ac, &th->session_key, 552 buf + sizeof(*head), end); 553 break; 554 555 default: 556 return -EINVAL; 557 } 558 if (ret) 559 return ret; 560 if (ac->want_keys == xi->have_keys) 561 return 0; 562 return -EAGAIN; 563 } 564 565 static void ceph_x_destroy_authorizer(struct ceph_authorizer *a) 566 { 567 struct ceph_x_authorizer *au = (void *)a; 568 569 ceph_x_authorizer_cleanup(au); 570 kfree(au); 571 } 572 573 static int ceph_x_create_authorizer( 574 struct ceph_auth_client *ac, int peer_type, 575 struct ceph_auth_handshake *auth) 576 { 577 struct ceph_x_authorizer *au; 578 struct ceph_x_ticket_handler *th; 579 int ret; 580 581 th = get_ticket_handler(ac, peer_type); 582 if (IS_ERR(th)) 583 return PTR_ERR(th); 584 585 au = kzalloc(sizeof(*au), GFP_NOFS); 586 if (!au) 587 return -ENOMEM; 588 589 au->base.destroy = ceph_x_destroy_authorizer; 590 591 ret = ceph_x_build_authorizer(ac, th, au); 592 if (ret) { 593 kfree(au); 594 return ret; 595 } 596 597 auth->authorizer = (struct ceph_authorizer *) au; 598 auth->authorizer_buf = au->buf->vec.iov_base; 599 auth->authorizer_buf_len = au->buf->vec.iov_len; 600 auth->authorizer_reply_buf = au->enc_buf; 601 auth->authorizer_reply_buf_len = CEPHX_AU_ENC_BUF_LEN; 602 auth->sign_message = ac->ops->sign_message; 603 auth->check_message_signature = ac->ops->check_message_signature; 604 605 return 0; 606 } 607 608 static int ceph_x_update_authorizer( 609 struct ceph_auth_client *ac, int peer_type, 610 struct ceph_auth_handshake *auth) 611 { 612 struct ceph_x_authorizer *au; 613 struct ceph_x_ticket_handler *th; 614 615 th = get_ticket_handler(ac, peer_type); 616 if (IS_ERR(th)) 617 return PTR_ERR(th); 618 619 au = (struct ceph_x_authorizer *)auth->authorizer; 620 if (au->secret_id < th->secret_id) { 621 dout("ceph_x_update_authorizer service %u secret %llu < %llu\n", 622 au->service, au->secret_id, th->secret_id); 623 return ceph_x_build_authorizer(ac, th, au); 624 } 625 return 0; 626 } 627 628 static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac, 629 struct ceph_authorizer *a) 630 { 631 struct ceph_x_authorizer *au = (void *)a; 632 void *p = au->enc_buf; 633 struct ceph_x_authorize_reply *reply = p + ceph_x_encrypt_offset(); 634 int ret; 635 636 ret = ceph_x_decrypt(&au->session_key, &p, p + CEPHX_AU_ENC_BUF_LEN); 637 if (ret < 0) 638 return ret; 639 if (ret != sizeof(*reply)) 640 return -EPERM; 641 642 if (au->nonce + 1 != le64_to_cpu(reply->nonce_plus_one)) 643 ret = -EPERM; 644 else 645 ret = 0; 646 dout("verify_authorizer_reply nonce %llx got %llx ret %d\n", 647 au->nonce, le64_to_cpu(reply->nonce_plus_one), ret); 648 return ret; 649 } 650 651 static void ceph_x_reset(struct ceph_auth_client *ac) 652 { 653 struct ceph_x_info *xi = ac->private; 654 655 dout("reset\n"); 656 xi->starting = true; 657 xi->server_challenge = 0; 658 } 659 660 static void ceph_x_destroy(struct ceph_auth_client *ac) 661 { 662 struct ceph_x_info *xi = ac->private; 663 struct rb_node *p; 664 665 dout("ceph_x_destroy %p\n", ac); 666 ceph_crypto_key_destroy(&xi->secret); 667 668 while ((p = rb_first(&xi->ticket_handlers)) != NULL) { 669 struct ceph_x_ticket_handler *th = 670 rb_entry(p, struct ceph_x_ticket_handler, node); 671 remove_ticket_handler(ac, th); 672 } 673 674 ceph_x_authorizer_cleanup(&xi->auth_authorizer); 675 676 kfree(ac->private); 677 ac->private = NULL; 678 } 679 680 static void invalidate_ticket(struct ceph_auth_client *ac, int peer_type) 681 { 682 struct ceph_x_ticket_handler *th; 683 684 th = get_ticket_handler(ac, peer_type); 685 if (!IS_ERR(th)) 686 th->have_key = false; 687 } 688 689 static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac, 690 int peer_type) 691 { 692 /* 693 * We are to invalidate a service ticket in the hopes of 694 * getting a new, hopefully more valid, one. But, we won't get 695 * it unless our AUTH ticket is good, so invalidate AUTH ticket 696 * as well, just in case. 697 */ 698 invalidate_ticket(ac, peer_type); 699 invalidate_ticket(ac, CEPH_ENTITY_TYPE_AUTH); 700 } 701 702 static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg, 703 __le64 *psig) 704 { 705 void *enc_buf = au->enc_buf; 706 struct { 707 __le32 len; 708 __le32 header_crc; 709 __le32 front_crc; 710 __le32 middle_crc; 711 __le32 data_crc; 712 } __packed *sigblock = enc_buf + ceph_x_encrypt_offset(); 713 int ret; 714 715 sigblock->len = cpu_to_le32(4*sizeof(u32)); 716 sigblock->header_crc = msg->hdr.crc; 717 sigblock->front_crc = msg->footer.front_crc; 718 sigblock->middle_crc = msg->footer.middle_crc; 719 sigblock->data_crc = msg->footer.data_crc; 720 ret = ceph_x_encrypt(&au->session_key, enc_buf, CEPHX_AU_ENC_BUF_LEN, 721 sizeof(*sigblock)); 722 if (ret < 0) 723 return ret; 724 725 *psig = *(__le64 *)(enc_buf + sizeof(u32)); 726 return 0; 727 } 728 729 static int ceph_x_sign_message(struct ceph_auth_handshake *auth, 730 struct ceph_msg *msg) 731 { 732 __le64 sig; 733 int ret; 734 735 if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN)) 736 return 0; 737 738 ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer, 739 msg, &sig); 740 if (ret) 741 return ret; 742 743 msg->footer.sig = sig; 744 msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED; 745 return 0; 746 } 747 748 static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth, 749 struct ceph_msg *msg) 750 { 751 __le64 sig_check; 752 int ret; 753 754 if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN)) 755 return 0; 756 757 ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer, 758 msg, &sig_check); 759 if (ret) 760 return ret; 761 if (sig_check == msg->footer.sig) 762 return 0; 763 if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED) 764 dout("ceph_x_check_message_signature %p has signature %llx " 765 "expect %llx\n", msg, msg->footer.sig, sig_check); 766 else 767 dout("ceph_x_check_message_signature %p sender did not set " 768 "CEPH_MSG_FOOTER_SIGNED\n", msg); 769 return -EBADMSG; 770 } 771 772 static const struct ceph_auth_client_ops ceph_x_ops = { 773 .name = "x", 774 .is_authenticated = ceph_x_is_authenticated, 775 .should_authenticate = ceph_x_should_authenticate, 776 .build_request = ceph_x_build_request, 777 .handle_reply = ceph_x_handle_reply, 778 .create_authorizer = ceph_x_create_authorizer, 779 .update_authorizer = ceph_x_update_authorizer, 780 .verify_authorizer_reply = ceph_x_verify_authorizer_reply, 781 .invalidate_authorizer = ceph_x_invalidate_authorizer, 782 .reset = ceph_x_reset, 783 .destroy = ceph_x_destroy, 784 .sign_message = ceph_x_sign_message, 785 .check_message_signature = ceph_x_check_message_signature, 786 }; 787 788 789 int ceph_x_init(struct ceph_auth_client *ac) 790 { 791 struct ceph_x_info *xi; 792 int ret; 793 794 dout("ceph_x_init %p\n", ac); 795 ret = -ENOMEM; 796 xi = kzalloc(sizeof(*xi), GFP_NOFS); 797 if (!xi) 798 goto out; 799 800 ret = -EINVAL; 801 if (!ac->key) { 802 pr_err("no secret set (for auth_x protocol)\n"); 803 goto out_nomem; 804 } 805 806 ret = ceph_crypto_key_clone(&xi->secret, ac->key); 807 if (ret < 0) { 808 pr_err("cannot clone key: %d\n", ret); 809 goto out_nomem; 810 } 811 812 xi->starting = true; 813 xi->ticket_handlers = RB_ROOT; 814 815 ac->protocol = CEPH_AUTH_CEPHX; 816 ac->private = xi; 817 ac->ops = &ceph_x_ops; 818 return 0; 819 820 out_nomem: 821 kfree(xi); 822 out: 823 return ret; 824 } 825 826 827