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_buflen(int ilen) 43 { 44 return sizeof(struct ceph_x_encrypt_header) + ilen + 16 + 45 sizeof(u32); 46 } 47 48 static int ceph_x_encrypt(struct ceph_crypto_key *secret, 49 void *ibuf, int ilen, void *obuf, size_t olen) 50 { 51 struct ceph_x_encrypt_header head = { 52 .struct_v = 1, 53 .magic = cpu_to_le64(CEPHX_ENC_MAGIC) 54 }; 55 size_t len = olen - sizeof(u32); 56 int ret; 57 58 ret = ceph_encrypt2(secret, obuf + sizeof(u32), &len, 59 &head, sizeof(head), ibuf, ilen); 60 if (ret) 61 return ret; 62 ceph_encode_32(&obuf, len); 63 return len + sizeof(u32); 64 } 65 66 static int ceph_x_decrypt(struct ceph_crypto_key *secret, 67 void **p, void *end, void **obuf, size_t olen) 68 { 69 struct ceph_x_encrypt_header head; 70 size_t head_len = sizeof(head); 71 int len, ret; 72 73 len = ceph_decode_32(p); 74 if (*p + len > end) 75 return -EINVAL; 76 77 dout("ceph_x_decrypt len %d\n", len); 78 if (*obuf == NULL) { 79 *obuf = kmalloc(len, GFP_NOFS); 80 if (!*obuf) 81 return -ENOMEM; 82 olen = len; 83 } 84 85 ret = ceph_decrypt2(secret, &head, &head_len, *obuf, &olen, *p, len); 86 if (ret) 87 return ret; 88 if (head.struct_v != 1 || le64_to_cpu(head.magic) != CEPHX_ENC_MAGIC) 89 return -EPERM; 90 *p += len; 91 return olen; 92 } 93 94 /* 95 * get existing (or insert new) ticket handler 96 */ 97 static struct ceph_x_ticket_handler * 98 get_ticket_handler(struct ceph_auth_client *ac, int service) 99 { 100 struct ceph_x_ticket_handler *th; 101 struct ceph_x_info *xi = ac->private; 102 struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node; 103 104 while (*p) { 105 parent = *p; 106 th = rb_entry(parent, struct ceph_x_ticket_handler, node); 107 if (service < th->service) 108 p = &(*p)->rb_left; 109 else if (service > th->service) 110 p = &(*p)->rb_right; 111 else 112 return th; 113 } 114 115 /* add it */ 116 th = kzalloc(sizeof(*th), GFP_NOFS); 117 if (!th) 118 return ERR_PTR(-ENOMEM); 119 th->service = service; 120 rb_link_node(&th->node, parent, p); 121 rb_insert_color(&th->node, &xi->ticket_handlers); 122 return th; 123 } 124 125 static void remove_ticket_handler(struct ceph_auth_client *ac, 126 struct ceph_x_ticket_handler *th) 127 { 128 struct ceph_x_info *xi = ac->private; 129 130 dout("remove_ticket_handler %p %d\n", th, th->service); 131 rb_erase(&th->node, &xi->ticket_handlers); 132 ceph_crypto_key_destroy(&th->session_key); 133 if (th->ticket_blob) 134 ceph_buffer_put(th->ticket_blob); 135 kfree(th); 136 } 137 138 static int process_one_ticket(struct ceph_auth_client *ac, 139 struct ceph_crypto_key *secret, 140 void **p, void *end) 141 { 142 struct ceph_x_info *xi = ac->private; 143 int type; 144 u8 tkt_struct_v, blob_struct_v; 145 struct ceph_x_ticket_handler *th; 146 void *dbuf = NULL; 147 void *dp, *dend; 148 int dlen; 149 char is_enc; 150 struct timespec validity; 151 struct ceph_crypto_key old_key; 152 void *ticket_buf = NULL; 153 void *tp, *tpend; 154 void **ptp; 155 struct ceph_crypto_key new_session_key; 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 dlen = ceph_x_decrypt(secret, p, end, &dbuf, 0); 178 if (dlen <= 0) { 179 ret = dlen; 180 goto out; 181 } 182 dout(" decrypted %d bytes\n", dlen); 183 dp = dbuf; 184 dend = dp + dlen; 185 186 tkt_struct_v = ceph_decode_8(&dp); 187 if (tkt_struct_v != 1) 188 goto bad; 189 190 memcpy(&old_key, &th->session_key, sizeof(old_key)); 191 ret = ceph_crypto_key_decode(&new_session_key, &dp, dend); 192 if (ret) 193 goto out; 194 195 ceph_decode_timespec(&validity, dp); 196 dp += sizeof(struct ceph_timespec); 197 new_expires = get_seconds() + validity.tv_sec; 198 new_renew_after = new_expires - (validity.tv_sec / 4); 199 dout(" expires=%lu renew_after=%lu\n", new_expires, 200 new_renew_after); 201 202 /* ticket blob for service */ 203 ceph_decode_8_safe(p, end, is_enc, bad); 204 if (is_enc) { 205 /* encrypted */ 206 dout(" encrypted ticket\n"); 207 dlen = ceph_x_decrypt(&old_key, p, end, &ticket_buf, 0); 208 if (dlen < 0) { 209 ret = dlen; 210 goto out; 211 } 212 tp = ticket_buf; 213 ptp = &tp; 214 tpend = *ptp + dlen; 215 } else { 216 /* unencrypted */ 217 ptp = p; 218 tpend = end; 219 } 220 ceph_decode_32_safe(ptp, tpend, dlen, bad); 221 dout(" ticket blob is %d bytes\n", dlen); 222 ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad); 223 blob_struct_v = ceph_decode_8(ptp); 224 new_secret_id = ceph_decode_64(ptp); 225 ret = ceph_decode_buffer(&new_ticket_blob, ptp, tpend); 226 if (ret) 227 goto out; 228 229 /* all is well, update our ticket */ 230 ceph_crypto_key_destroy(&th->session_key); 231 if (th->ticket_blob) 232 ceph_buffer_put(th->ticket_blob); 233 th->session_key = new_session_key; 234 th->ticket_blob = new_ticket_blob; 235 th->secret_id = new_secret_id; 236 th->expires = new_expires; 237 th->renew_after = new_renew_after; 238 th->have_key = true; 239 dout(" got ticket service %d (%s) secret_id %lld len %d\n", 240 type, ceph_entity_type_name(type), th->secret_id, 241 (int)th->ticket_blob->vec.iov_len); 242 xi->have_keys |= th->service; 243 244 out: 245 kfree(ticket_buf); 246 kfree(dbuf); 247 return ret; 248 249 bad: 250 ret = -EINVAL; 251 goto out; 252 } 253 254 static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac, 255 struct ceph_crypto_key *secret, 256 void *buf, void *end) 257 { 258 void *p = buf; 259 u8 reply_struct_v; 260 u32 num; 261 int ret; 262 263 ceph_decode_8_safe(&p, end, reply_struct_v, bad); 264 if (reply_struct_v != 1) 265 return -EINVAL; 266 267 ceph_decode_32_safe(&p, end, num, bad); 268 dout("%d tickets\n", num); 269 270 while (num--) { 271 ret = process_one_ticket(ac, secret, &p, end); 272 if (ret) 273 return ret; 274 } 275 276 return 0; 277 278 bad: 279 return -EINVAL; 280 } 281 282 static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au) 283 { 284 ceph_crypto_key_destroy(&au->session_key); 285 if (au->buf) { 286 ceph_buffer_put(au->buf); 287 au->buf = NULL; 288 } 289 } 290 291 static int ceph_x_build_authorizer(struct ceph_auth_client *ac, 292 struct ceph_x_ticket_handler *th, 293 struct ceph_x_authorizer *au) 294 { 295 int maxlen; 296 struct ceph_x_authorize_a *msg_a; 297 struct ceph_x_authorize_b msg_b; 298 void *p, *end; 299 int ret; 300 int ticket_blob_len = 301 (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0); 302 303 dout("build_authorizer for %s %p\n", 304 ceph_entity_type_name(th->service), au); 305 306 ceph_crypto_key_destroy(&au->session_key); 307 ret = ceph_crypto_key_clone(&au->session_key, &th->session_key); 308 if (ret) 309 goto out_au; 310 311 maxlen = sizeof(*msg_a) + sizeof(msg_b) + 312 ceph_x_encrypt_buflen(ticket_blob_len); 313 dout(" need len %d\n", maxlen); 314 if (au->buf && au->buf->alloc_len < maxlen) { 315 ceph_buffer_put(au->buf); 316 au->buf = NULL; 317 } 318 if (!au->buf) { 319 au->buf = ceph_buffer_new(maxlen, GFP_NOFS); 320 if (!au->buf) { 321 ret = -ENOMEM; 322 goto out_au; 323 } 324 } 325 au->service = th->service; 326 au->secret_id = th->secret_id; 327 328 msg_a = au->buf->vec.iov_base; 329 msg_a->struct_v = 1; 330 msg_a->global_id = cpu_to_le64(ac->global_id); 331 msg_a->service_id = cpu_to_le32(th->service); 332 msg_a->ticket_blob.struct_v = 1; 333 msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id); 334 msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len); 335 if (ticket_blob_len) { 336 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base, 337 th->ticket_blob->vec.iov_len); 338 } 339 dout(" th %p secret_id %lld %lld\n", th, th->secret_id, 340 le64_to_cpu(msg_a->ticket_blob.secret_id)); 341 342 p = msg_a + 1; 343 p += ticket_blob_len; 344 end = au->buf->vec.iov_base + au->buf->vec.iov_len; 345 346 get_random_bytes(&au->nonce, sizeof(au->nonce)); 347 msg_b.struct_v = 1; 348 msg_b.nonce = cpu_to_le64(au->nonce); 349 ret = ceph_x_encrypt(&au->session_key, &msg_b, sizeof(msg_b), 350 p, end - p); 351 if (ret < 0) 352 goto out_au; 353 p += ret; 354 au->buf->vec.iov_len = p - au->buf->vec.iov_base; 355 dout(" built authorizer nonce %llx len %d\n", au->nonce, 356 (int)au->buf->vec.iov_len); 357 BUG_ON(au->buf->vec.iov_len > maxlen); 358 return 0; 359 360 out_au: 361 ceph_x_authorizer_cleanup(au); 362 return ret; 363 } 364 365 static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th, 366 void **p, void *end) 367 { 368 ceph_decode_need(p, end, 1 + sizeof(u64), bad); 369 ceph_encode_8(p, 1); 370 ceph_encode_64(p, th->secret_id); 371 if (th->ticket_blob) { 372 const char *buf = th->ticket_blob->vec.iov_base; 373 u32 len = th->ticket_blob->vec.iov_len; 374 375 ceph_encode_32_safe(p, end, len, bad); 376 ceph_encode_copy_safe(p, end, buf, len, bad); 377 } else { 378 ceph_encode_32_safe(p, end, 0, bad); 379 } 380 381 return 0; 382 bad: 383 return -ERANGE; 384 } 385 386 static bool need_key(struct ceph_x_ticket_handler *th) 387 { 388 if (!th->have_key) 389 return true; 390 391 return get_seconds() >= th->renew_after; 392 } 393 394 static bool have_key(struct ceph_x_ticket_handler *th) 395 { 396 if (th->have_key) { 397 if (get_seconds() >= th->expires) 398 th->have_key = false; 399 } 400 401 return th->have_key; 402 } 403 404 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed) 405 { 406 int want = ac->want_keys; 407 struct ceph_x_info *xi = ac->private; 408 int service; 409 410 *pneed = ac->want_keys & ~(xi->have_keys); 411 412 for (service = 1; service <= want; service <<= 1) { 413 struct ceph_x_ticket_handler *th; 414 415 if (!(ac->want_keys & service)) 416 continue; 417 418 if (*pneed & service) 419 continue; 420 421 th = get_ticket_handler(ac, service); 422 if (IS_ERR(th)) { 423 *pneed |= service; 424 continue; 425 } 426 427 if (need_key(th)) 428 *pneed |= service; 429 if (!have_key(th)) 430 xi->have_keys &= ~service; 431 } 432 } 433 434 static int ceph_x_build_request(struct ceph_auth_client *ac, 435 void *buf, void *end) 436 { 437 struct ceph_x_info *xi = ac->private; 438 int need; 439 struct ceph_x_request_header *head = buf; 440 int ret; 441 struct ceph_x_ticket_handler *th = 442 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); 443 444 if (IS_ERR(th)) 445 return PTR_ERR(th); 446 447 ceph_x_validate_tickets(ac, &need); 448 449 dout("build_request want %x have %x need %x\n", 450 ac->want_keys, xi->have_keys, need); 451 452 if (need & CEPH_ENTITY_TYPE_AUTH) { 453 struct ceph_x_authenticate *auth = (void *)(head + 1); 454 void *p = auth + 1; 455 struct ceph_x_challenge_blob tmp; 456 char tmp_enc[40]; 457 u64 *u; 458 459 if (p > end) 460 return -ERANGE; 461 462 dout(" get_auth_session_key\n"); 463 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY); 464 465 /* encrypt and hash */ 466 get_random_bytes(&auth->client_challenge, sizeof(u64)); 467 tmp.client_challenge = auth->client_challenge; 468 tmp.server_challenge = cpu_to_le64(xi->server_challenge); 469 ret = ceph_x_encrypt(&xi->secret, &tmp, sizeof(tmp), 470 tmp_enc, sizeof(tmp_enc)); 471 if (ret < 0) 472 return ret; 473 474 auth->struct_v = 1; 475 auth->key = 0; 476 for (u = (u64 *)tmp_enc; u + 1 <= (u64 *)(tmp_enc + ret); u++) 477 auth->key ^= *(__le64 *)u; 478 dout(" server_challenge %llx client_challenge %llx key %llx\n", 479 xi->server_challenge, le64_to_cpu(auth->client_challenge), 480 le64_to_cpu(auth->key)); 481 482 /* now encode the old ticket if exists */ 483 ret = ceph_x_encode_ticket(th, &p, end); 484 if (ret < 0) 485 return ret; 486 487 return p - buf; 488 } 489 490 if (need) { 491 void *p = head + 1; 492 struct ceph_x_service_ticket_request *req; 493 494 if (p > end) 495 return -ERANGE; 496 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY); 497 498 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer); 499 if (ret) 500 return ret; 501 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base, 502 xi->auth_authorizer.buf->vec.iov_len); 503 504 req = p; 505 req->keys = cpu_to_le32(need); 506 p += sizeof(*req); 507 return p - buf; 508 } 509 510 return 0; 511 } 512 513 static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result, 514 void *buf, void *end) 515 { 516 struct ceph_x_info *xi = ac->private; 517 struct ceph_x_reply_header *head = buf; 518 struct ceph_x_ticket_handler *th; 519 int len = end - buf; 520 int op; 521 int ret; 522 523 if (result) 524 return result; /* XXX hmm? */ 525 526 if (xi->starting) { 527 /* it's a hello */ 528 struct ceph_x_server_challenge *sc = buf; 529 530 if (len != sizeof(*sc)) 531 return -EINVAL; 532 xi->server_challenge = le64_to_cpu(sc->server_challenge); 533 dout("handle_reply got server challenge %llx\n", 534 xi->server_challenge); 535 xi->starting = false; 536 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH; 537 return -EAGAIN; 538 } 539 540 op = le16_to_cpu(head->op); 541 result = le32_to_cpu(head->result); 542 dout("handle_reply op %d result %d\n", op, result); 543 switch (op) { 544 case CEPHX_GET_AUTH_SESSION_KEY: 545 /* verify auth key */ 546 ret = ceph_x_proc_ticket_reply(ac, &xi->secret, 547 buf + sizeof(*head), end); 548 break; 549 550 case CEPHX_GET_PRINCIPAL_SESSION_KEY: 551 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); 552 if (IS_ERR(th)) 553 return PTR_ERR(th); 554 ret = ceph_x_proc_ticket_reply(ac, &th->session_key, 555 buf + sizeof(*head), end); 556 break; 557 558 default: 559 return -EINVAL; 560 } 561 if (ret) 562 return ret; 563 if (ac->want_keys == xi->have_keys) 564 return 0; 565 return -EAGAIN; 566 } 567 568 static void ceph_x_destroy_authorizer(struct ceph_authorizer *a) 569 { 570 struct ceph_x_authorizer *au = (void *)a; 571 572 ceph_x_authorizer_cleanup(au); 573 kfree(au); 574 } 575 576 static int ceph_x_create_authorizer( 577 struct ceph_auth_client *ac, int peer_type, 578 struct ceph_auth_handshake *auth) 579 { 580 struct ceph_x_authorizer *au; 581 struct ceph_x_ticket_handler *th; 582 int ret; 583 584 th = get_ticket_handler(ac, peer_type); 585 if (IS_ERR(th)) 586 return PTR_ERR(th); 587 588 au = kzalloc(sizeof(*au), GFP_NOFS); 589 if (!au) 590 return -ENOMEM; 591 592 au->base.destroy = ceph_x_destroy_authorizer; 593 594 ret = ceph_x_build_authorizer(ac, th, au); 595 if (ret) { 596 kfree(au); 597 return ret; 598 } 599 600 auth->authorizer = (struct ceph_authorizer *) au; 601 auth->authorizer_buf = au->buf->vec.iov_base; 602 auth->authorizer_buf_len = au->buf->vec.iov_len; 603 auth->authorizer_reply_buf = au->reply_buf; 604 auth->authorizer_reply_buf_len = sizeof (au->reply_buf); 605 auth->sign_message = ac->ops->sign_message; 606 auth->check_message_signature = ac->ops->check_message_signature; 607 608 return 0; 609 } 610 611 static int ceph_x_update_authorizer( 612 struct ceph_auth_client *ac, int peer_type, 613 struct ceph_auth_handshake *auth) 614 { 615 struct ceph_x_authorizer *au; 616 struct ceph_x_ticket_handler *th; 617 618 th = get_ticket_handler(ac, peer_type); 619 if (IS_ERR(th)) 620 return PTR_ERR(th); 621 622 au = (struct ceph_x_authorizer *)auth->authorizer; 623 if (au->secret_id < th->secret_id) { 624 dout("ceph_x_update_authorizer service %u secret %llu < %llu\n", 625 au->service, au->secret_id, th->secret_id); 626 return ceph_x_build_authorizer(ac, th, au); 627 } 628 return 0; 629 } 630 631 static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac, 632 struct ceph_authorizer *a, size_t len) 633 { 634 struct ceph_x_authorizer *au = (void *)a; 635 int ret = 0; 636 struct ceph_x_authorize_reply reply; 637 void *preply = &reply; 638 void *p = au->reply_buf; 639 void *end = p + sizeof(au->reply_buf); 640 641 ret = ceph_x_decrypt(&au->session_key, &p, end, &preply, sizeof(reply)); 642 if (ret < 0) 643 return ret; 644 if (ret != sizeof(reply)) 645 return -EPERM; 646 647 if (au->nonce + 1 != le64_to_cpu(reply.nonce_plus_one)) 648 ret = -EPERM; 649 else 650 ret = 0; 651 dout("verify_authorizer_reply nonce %llx got %llx ret %d\n", 652 au->nonce, le64_to_cpu(reply.nonce_plus_one), ret); 653 return ret; 654 } 655 656 static void ceph_x_reset(struct ceph_auth_client *ac) 657 { 658 struct ceph_x_info *xi = ac->private; 659 660 dout("reset\n"); 661 xi->starting = true; 662 xi->server_challenge = 0; 663 } 664 665 static void ceph_x_destroy(struct ceph_auth_client *ac) 666 { 667 struct ceph_x_info *xi = ac->private; 668 struct rb_node *p; 669 670 dout("ceph_x_destroy %p\n", ac); 671 ceph_crypto_key_destroy(&xi->secret); 672 673 while ((p = rb_first(&xi->ticket_handlers)) != NULL) { 674 struct ceph_x_ticket_handler *th = 675 rb_entry(p, struct ceph_x_ticket_handler, node); 676 remove_ticket_handler(ac, th); 677 } 678 679 ceph_x_authorizer_cleanup(&xi->auth_authorizer); 680 681 kfree(ac->private); 682 ac->private = NULL; 683 } 684 685 static void invalidate_ticket(struct ceph_auth_client *ac, int peer_type) 686 { 687 struct ceph_x_ticket_handler *th; 688 689 th = get_ticket_handler(ac, peer_type); 690 if (!IS_ERR(th)) 691 th->have_key = false; 692 } 693 694 static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac, 695 int peer_type) 696 { 697 /* 698 * We are to invalidate a service ticket in the hopes of 699 * getting a new, hopefully more valid, one. But, we won't get 700 * it unless our AUTH ticket is good, so invalidate AUTH ticket 701 * as well, just in case. 702 */ 703 invalidate_ticket(ac, peer_type); 704 invalidate_ticket(ac, CEPH_ENTITY_TYPE_AUTH); 705 } 706 707 static int calcu_signature(struct ceph_x_authorizer *au, 708 struct ceph_msg *msg, __le64 *sig) 709 { 710 int ret; 711 char tmp_enc[40]; 712 __le32 tmp[5] = { 713 cpu_to_le32(16), msg->hdr.crc, msg->footer.front_crc, 714 msg->footer.middle_crc, msg->footer.data_crc, 715 }; 716 ret = ceph_x_encrypt(&au->session_key, &tmp, sizeof(tmp), 717 tmp_enc, sizeof(tmp_enc)); 718 if (ret < 0) 719 return ret; 720 *sig = *(__le64*)(tmp_enc + 4); 721 return 0; 722 } 723 724 static int ceph_x_sign_message(struct ceph_auth_handshake *auth, 725 struct ceph_msg *msg) 726 { 727 int ret; 728 729 if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN)) 730 return 0; 731 732 ret = calcu_signature((struct ceph_x_authorizer *)auth->authorizer, 733 msg, &msg->footer.sig); 734 if (ret < 0) 735 return ret; 736 msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED; 737 return 0; 738 } 739 740 static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth, 741 struct ceph_msg *msg) 742 { 743 __le64 sig_check; 744 int ret; 745 746 if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN)) 747 return 0; 748 749 ret = calcu_signature((struct ceph_x_authorizer *)auth->authorizer, 750 msg, &sig_check); 751 if (ret < 0) 752 return ret; 753 if (sig_check == msg->footer.sig) 754 return 0; 755 if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED) 756 dout("ceph_x_check_message_signature %p has signature %llx " 757 "expect %llx\n", msg, msg->footer.sig, sig_check); 758 else 759 dout("ceph_x_check_message_signature %p sender did not set " 760 "CEPH_MSG_FOOTER_SIGNED\n", msg); 761 return -EBADMSG; 762 } 763 764 static const struct ceph_auth_client_ops ceph_x_ops = { 765 .name = "x", 766 .is_authenticated = ceph_x_is_authenticated, 767 .should_authenticate = ceph_x_should_authenticate, 768 .build_request = ceph_x_build_request, 769 .handle_reply = ceph_x_handle_reply, 770 .create_authorizer = ceph_x_create_authorizer, 771 .update_authorizer = ceph_x_update_authorizer, 772 .verify_authorizer_reply = ceph_x_verify_authorizer_reply, 773 .invalidate_authorizer = ceph_x_invalidate_authorizer, 774 .reset = ceph_x_reset, 775 .destroy = ceph_x_destroy, 776 .sign_message = ceph_x_sign_message, 777 .check_message_signature = ceph_x_check_message_signature, 778 }; 779 780 781 int ceph_x_init(struct ceph_auth_client *ac) 782 { 783 struct ceph_x_info *xi; 784 int ret; 785 786 dout("ceph_x_init %p\n", ac); 787 ret = -ENOMEM; 788 xi = kzalloc(sizeof(*xi), GFP_NOFS); 789 if (!xi) 790 goto out; 791 792 ret = -EINVAL; 793 if (!ac->key) { 794 pr_err("no secret set (for auth_x protocol)\n"); 795 goto out_nomem; 796 } 797 798 ret = ceph_crypto_key_clone(&xi->secret, ac->key); 799 if (ret < 0) { 800 pr_err("cannot clone key: %d\n", ret); 801 goto out_nomem; 802 } 803 804 xi->starting = true; 805 xi->ticket_handlers = RB_ROOT; 806 807 ac->protocol = CEPH_AUTH_CEPHX; 808 ac->private = xi; 809 ac->ops = &ceph_x_ops; 810 return 0; 811 812 out_nomem: 813 kfree(xi); 814 out: 815 return ret; 816 } 817 818 819