net/ceph/auth_x.c

   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/messenger.h>
  12
  13 #include "crypto.h"
  14 #include "auth_x.h"
  15 #include "auth_x_protocol.h"
  16
  17 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed);
  18
  19 static int ceph_x_is_authenticated(struct ceph_auth_client *ac)
  20 {
  21         struct ceph_x_info *xi = ac->private;
  22         int need;
  23
  24         ceph_x_validate_tickets(ac, &need);
  25         dout("ceph_x_is_authenticated want=%d need=%d have=%d\n",
  26              ac->want_keys, need, xi->have_keys);
  27         return (ac->want_keys & xi->have_keys) == ac->want_keys;
  28 }
  29
  30 static int ceph_x_should_authenticate(struct ceph_auth_client *ac)
  31 {
  32         struct ceph_x_info *xi = ac->private;
  33         int need;
  34
  35         ceph_x_validate_tickets(ac, &need);
  36         dout("ceph_x_should_authenticate want=%d need=%d have=%d\n",
  37              ac->want_keys, need, xi->have_keys);
  38         return need != 0;
  39 }
  40
  41 static int ceph_x_encrypt_buflen(int ilen)
  42 {
  43         return sizeof(struct ceph_x_encrypt_header) + ilen + 16 +
  44                 sizeof(u32);
  45 }
  46
  47 static int ceph_x_encrypt(struct ceph_crypto_key *secret,
  48                           void *ibuf, int ilen, void *obuf, size_t olen)
  49 {
  50         struct ceph_x_encrypt_header head = {
  51                 .struct_v = 1,
  52                 .magic = cpu_to_le64(CEPHX_ENC_MAGIC)
  53         };
  54         size_t len = olen - sizeof(u32);
  55         int ret;
  56
  57         ret = ceph_encrypt2(secret, obuf + sizeof(u32), &len,
  58                             &head, sizeof(head), ibuf, ilen);
  59         if (ret)
  60                 return ret;
  61         ceph_encode_32(&obuf, len);
  62         return len + sizeof(u32);
  63 }
  64
  65 static int ceph_x_decrypt(struct ceph_crypto_key *secret,
  66                           void **p, void *end, void **obuf, size_t olen)
  67 {
  68         struct ceph_x_encrypt_header head;
  69         size_t head_len = sizeof(head);
  70         int len, ret;
  71
  72         len = ceph_decode_32(p);
  73         if (*p + len > end)
  74                 return -EINVAL;
  75
  76         dout("ceph_x_decrypt len %d\n", len);
  77         if (*obuf == NULL) {
  78                 *obuf = kmalloc(len, GFP_NOFS);
  79                 if (!*obuf)
  80                         return -ENOMEM;
  81                 olen = len;
  82         }
  83
  84         ret = ceph_decrypt2(secret, &head, &head_len, *obuf, &olen, *p, len);
  85         if (ret)
  86                 return ret;
  87         if (head.struct_v != 1 || le64_to_cpu(head.magic) != CEPHX_ENC_MAGIC)
  88                 return -EPERM;
  89         *p += len;
  90         return olen;
  91 }
  92
  93 /*
  94  * get existing (or insert new) ticket handler
  95  */
  96 static struct ceph_x_ticket_handler *
  97 get_ticket_handler(struct ceph_auth_client *ac, int service)
  98 {
  99         struct ceph_x_ticket_handler *th;
 100         struct ceph_x_info *xi = ac->private;
 101         struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node;
 102
 103         while (*p) {
 104                 parent = *p;
 105                 th = rb_entry(parent, struct ceph_x_ticket_handler, node);
 106                 if (service < th->service)
 107                         p = &(*p)->rb_left;
 108                 else if (service > th->service)
 109                         p = &(*p)->rb_right;
 110                 else
 111                         return th;
 112         }
 113
 114         /* add it */
 115         th = kzalloc(sizeof(*th), GFP_NOFS);
 116         if (!th)
 117                 return ERR_PTR(-ENOMEM);
 118         th->service = service;
 119         rb_link_node(&th->node, parent, p);
 120         rb_insert_color(&th->node, &xi->ticket_handlers);
 121         return th;
 122 }
 123
 124 static void remove_ticket_handler(struct ceph_auth_client *ac,
 125                                   struct ceph_x_ticket_handler *th)
 126 {
 127         struct ceph_x_info *xi = ac->private;
 128
 129         dout("remove_ticket_handler %p %d\n", th, th->service);
 130         rb_erase(&th->node, &xi->ticket_handlers);
 131         ceph_crypto_key_destroy(&th->session_key);
 132         if (th->ticket_blob)
 133                 ceph_buffer_put(th->ticket_blob);
 134         kfree(th);
 135 }
 136
 137 static int process_one_ticket(struct ceph_auth_client *ac,
 138                               struct ceph_crypto_key *secret,
 139                               void **p, void *end)
 140 {
 141         struct ceph_x_info *xi = ac->private;
 142         int type;
 143         u8 tkt_struct_v, blob_struct_v;
 144         struct ceph_x_ticket_handler *th;
 145         void *dbuf = NULL;
 146         void *dp, *dend;
 147         int dlen;
 148         char is_enc;
 149         struct timespec validity;
 150         struct ceph_crypto_key old_key;
 151         void *ticket_buf = NULL;
 152         void *tp, *tpend;
 153         void **ptp;
 154         struct ceph_timespec new_validity;
 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_copy(&dp, &new_validity, sizeof(new_validity));
 196         ceph_decode_timespec(&validity, &new_validity);
 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->validity = new_validity;
 236         th->secret_id = new_secret_id;
 237         th->expires = new_expires;
 238         th->renew_after = new_renew_after;
 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 int ceph_x_build_authorizer(struct ceph_auth_client *ac,
 283                                    struct ceph_x_ticket_handler *th,
 284                                    struct ceph_x_authorizer *au)
 285 {
 286         int maxlen;
 287         struct ceph_x_authorize_a *msg_a;
 288         struct ceph_x_authorize_b msg_b;
 289         void *p, *end;
 290         int ret;
 291         int ticket_blob_len =
 292                 (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0);
 293
 294         dout("build_authorizer for %s %p\n",
 295              ceph_entity_type_name(th->service), au);
 296
 297         ceph_crypto_key_destroy(&au->session_key);
 298         ret = ceph_crypto_key_clone(&au->session_key, &th->session_key);
 299         if (ret)
 300                 return ret;
 301
 302         maxlen = sizeof(*msg_a) + sizeof(msg_b) +
 303                 ceph_x_encrypt_buflen(ticket_blob_len);
 304         dout("  need len %d\n", maxlen);
 305         if (au->buf && au->buf->alloc_len < maxlen) {
 306                 ceph_buffer_put(au->buf);
 307                 au->buf = NULL;
 308         }
 309         if (!au->buf) {
 310                 au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
 311                 if (!au->buf) {
 312                         ceph_crypto_key_destroy(&au->session_key);
 313                         return -ENOMEM;
 314                 }
 315         }
 316         au->service = th->service;
 317         au->secret_id = th->secret_id;
 318
 319         msg_a = au->buf->vec.iov_base;
 320         msg_a->struct_v = 1;
 321         msg_a->global_id = cpu_to_le64(ac->global_id);
 322         msg_a->service_id = cpu_to_le32(th->service);
 323         msg_a->ticket_blob.struct_v = 1;
 324         msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
 325         msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
 326         if (ticket_blob_len) {
 327                 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
 328                        th->ticket_blob->vec.iov_len);
 329         }
 330         dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
 331              le64_to_cpu(msg_a->ticket_blob.secret_id));
 332
 333         p = msg_a + 1;
 334         p += ticket_blob_len;
 335         end = au->buf->vec.iov_base + au->buf->vec.iov_len;
 336
 337         get_random_bytes(&au->nonce, sizeof(au->nonce));
 338         msg_b.struct_v = 1;
 339         msg_b.nonce = cpu_to_le64(au->nonce);
 340         ret = ceph_x_encrypt(&au->session_key, &msg_b, sizeof(msg_b),
 341                              p, end - p);
 342         if (ret < 0)
 343                 goto out_buf;
 344         p += ret;
 345         au->buf->vec.iov_len = p - au->buf->vec.iov_base;
 346         dout(" built authorizer nonce %llx len %d\n", au->nonce,
 347              (int)au->buf->vec.iov_len);
 348         BUG_ON(au->buf->vec.iov_len > maxlen);
 349         return 0;
 350
 351 out_buf:
 352         ceph_buffer_put(au->buf);
 353         au->buf = NULL;
 354         return ret;
 355 }
 356
 357 static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
 358                                 void **p, void *end)
 359 {
 360         ceph_decode_need(p, end, 1 + sizeof(u64), bad);
 361         ceph_encode_8(p, 1);
 362         ceph_encode_64(p, th->secret_id);
 363         if (th->ticket_blob) {
 364                 const char *buf = th->ticket_blob->vec.iov_base;
 365                 u32 len = th->ticket_blob->vec.iov_len;
 366
 367                 ceph_encode_32_safe(p, end, len, bad);
 368                 ceph_encode_copy_safe(p, end, buf, len, bad);
 369         } else {
 370                 ceph_encode_32_safe(p, end, 0, bad);
 371         }
 372
 373         return 0;
 374 bad:
 375         return -ERANGE;
 376 }
 377
 378 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
 379 {
 380         int want = ac->want_keys;
 381         struct ceph_x_info *xi = ac->private;
 382         int service;
 383
 384         *pneed = ac->want_keys & ~(xi->have_keys);
 385
 386         for (service = 1; service <= want; service <<= 1) {
 387                 struct ceph_x_ticket_handler *th;
 388
 389                 if (!(ac->want_keys & service))
 390                         continue;
 391
 392                 if (*pneed & service)
 393                         continue;
 394
 395                 th = get_ticket_handler(ac, service);
 396
 397                 if (IS_ERR(th)) {
 398                         *pneed |= service;
 399                         continue;
 400                 }
 401
 402                 if (get_seconds() >= th->renew_after)
 403                         *pneed |= service;
 404                 if (get_seconds() >= th->expires)
 405                         xi->have_keys &= ~service;
 406         }
 407 }
 408
 409
 410 static int ceph_x_build_request(struct ceph_auth_client *ac,
 411                                 void *buf, void *end)
 412 {
 413         struct ceph_x_info *xi = ac->private;
 414         int need;
 415         struct ceph_x_request_header *head = buf;
 416         int ret;
 417         struct ceph_x_ticket_handler *th =
 418                 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 419
 420         if (IS_ERR(th))
 421                 return PTR_ERR(th);
 422
 423         ceph_x_validate_tickets(ac, &need);
 424
 425         dout("build_request want %x have %x need %x\n",
 426              ac->want_keys, xi->have_keys, need);
 427
 428         if (need & CEPH_ENTITY_TYPE_AUTH) {
 429                 struct ceph_x_authenticate *auth = (void *)(head + 1);
 430                 void *p = auth + 1;
 431                 struct ceph_x_challenge_blob tmp;
 432                 char tmp_enc[40];
 433                 u64 *u;
 434
 435                 if (p > end)
 436                         return -ERANGE;
 437
 438                 dout(" get_auth_session_key\n");
 439                 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
 440
 441                 /* encrypt and hash */
 442                 get_random_bytes(&auth->client_challenge, sizeof(u64));
 443                 tmp.client_challenge = auth->client_challenge;
 444                 tmp.server_challenge = cpu_to_le64(xi->server_challenge);
 445                 ret = ceph_x_encrypt(&xi->secret, &tmp, sizeof(tmp),
 446                                      tmp_enc, sizeof(tmp_enc));
 447                 if (ret < 0)
 448                         return ret;
 449
 450                 auth->struct_v = 1;
 451                 auth->key = 0;
 452                 for (u = (u64 *)tmp_enc; u + 1 <= (u64 *)(tmp_enc + ret); u++)
 453                         auth->key ^= *(__le64 *)u;
 454                 dout(" server_challenge %llx client_challenge %llx key %llx\n",
 455                      xi->server_challenge, le64_to_cpu(auth->client_challenge),
 456                      le64_to_cpu(auth->key));
 457
 458                 /* now encode the old ticket if exists */
 459                 ret = ceph_x_encode_ticket(th, &p, end);
 460                 if (ret < 0)
 461                         return ret;
 462
 463                 return p - buf;
 464         }
 465
 466         if (need) {
 467                 void *p = head + 1;
 468                 struct ceph_x_service_ticket_request *req;
 469
 470                 if (p > end)
 471                         return -ERANGE;
 472                 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
 473
 474                 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
 475                 if (ret)
 476                         return ret;
 477                 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
 478                                  xi->auth_authorizer.buf->vec.iov_len);
 479
 480                 req = p;
 481                 req->keys = cpu_to_le32(need);
 482                 p += sizeof(*req);
 483                 return p - buf;
 484         }
 485
 486         return 0;
 487 }
 488
 489 static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
 490                                void *buf, void *end)
 491 {
 492         struct ceph_x_info *xi = ac->private;
 493         struct ceph_x_reply_header *head = buf;
 494         struct ceph_x_ticket_handler *th;
 495         int len = end - buf;
 496         int op;
 497         int ret;
 498
 499         if (result)
 500                 return result;  /* XXX hmm? */
 501
 502         if (xi->starting) {
 503                 /* it's a hello */
 504                 struct ceph_x_server_challenge *sc = buf;
 505
 506                 if (len != sizeof(*sc))
 507                         return -EINVAL;
 508                 xi->server_challenge = le64_to_cpu(sc->server_challenge);
 509                 dout("handle_reply got server challenge %llx\n",
 510                      xi->server_challenge);
 511                 xi->starting = false;
 512                 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
 513                 return -EAGAIN;
 514         }
 515
 516         op = le16_to_cpu(head->op);
 517         result = le32_to_cpu(head->result);
 518         dout("handle_reply op %d result %d\n", op, result);
 519         switch (op) {
 520         case CEPHX_GET_AUTH_SESSION_KEY:
 521                 /* verify auth key */
 522                 ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
 523                                                buf + sizeof(*head), end);
 524                 break;
 525
 526         case CEPHX_GET_PRINCIPAL_SESSION_KEY:
 527                 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 528                 if (IS_ERR(th))
 529                         return PTR_ERR(th);
 530                 ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
 531                                                buf + sizeof(*head), end);
 532                 break;
 533
 534         default:
 535                 return -EINVAL;
 536         }
 537         if (ret)
 538                 return ret;
 539         if (ac->want_keys == xi->have_keys)
 540                 return 0;
 541         return -EAGAIN;
 542 }
 543
 544 static int ceph_x_create_authorizer(
 545         struct ceph_auth_client *ac, int peer_type,
 546         struct ceph_auth_handshake *auth)
 547 {
 548         struct ceph_x_authorizer *au;
 549         struct ceph_x_ticket_handler *th;
 550         int ret;
 551
 552         th = get_ticket_handler(ac, peer_type);
 553         if (IS_ERR(th))
 554                 return PTR_ERR(th);
 555
 556         au = kzalloc(sizeof(*au), GFP_NOFS);
 557         if (!au)
 558                 return -ENOMEM;
 559
 560         ret = ceph_x_build_authorizer(ac, th, au);
 561         if (ret) {
 562                 kfree(au);
 563                 return ret;
 564         }
 565
 566         auth->authorizer = (struct ceph_authorizer *) au;
 567         auth->authorizer_buf = au->buf->vec.iov_base;
 568         auth->authorizer_buf_len = au->buf->vec.iov_len;
 569         auth->authorizer_reply_buf = au->reply_buf;
 570         auth->authorizer_reply_buf_len = sizeof (au->reply_buf);
 571         auth->sign_message = ac->ops->sign_message;
 572         auth->check_message_signature = ac->ops->check_message_signature;
 573
 574         return 0;
 575 }
 576
 577 static int ceph_x_update_authorizer(
 578         struct ceph_auth_client *ac, int peer_type,
 579         struct ceph_auth_handshake *auth)
 580 {
 581         struct ceph_x_authorizer *au;
 582         struct ceph_x_ticket_handler *th;
 583
 584         th = get_ticket_handler(ac, peer_type);
 585         if (IS_ERR(th))
 586                 return PTR_ERR(th);
 587
 588         au = (struct ceph_x_authorizer *)auth->authorizer;
 589         if (au->secret_id < th->secret_id) {
 590                 dout("ceph_x_update_authorizer service %u secret %llu < %llu\n",
 591                      au->service, au->secret_id, th->secret_id);
 592                 return ceph_x_build_authorizer(ac, th, au);
 593         }
 594         return 0;
 595 }
 596
 597 static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
 598                                           struct ceph_authorizer *a, size_t len)
 599 {
 600         struct ceph_x_authorizer *au = (void *)a;
 601         int ret = 0;
 602         struct ceph_x_authorize_reply reply;
 603         void *preply = &reply;
 604         void *p = au->reply_buf;
 605         void *end = p + sizeof(au->reply_buf);
 606
 607         ret = ceph_x_decrypt(&au->session_key, &p, end, &preply, sizeof(reply));
 608         if (ret < 0)
 609                 return ret;
 610         if (ret != sizeof(reply))
 611                 return -EPERM;
 612
 613         if (au->nonce + 1 != le64_to_cpu(reply.nonce_plus_one))
 614                 ret = -EPERM;
 615         else
 616                 ret = 0;
 617         dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
 618              au->nonce, le64_to_cpu(reply.nonce_plus_one), ret);
 619         return ret;
 620 }
 621
 622 static void ceph_x_destroy_authorizer(struct ceph_auth_client *ac,
 623                                       struct ceph_authorizer *a)
 624 {
 625         struct ceph_x_authorizer *au = (void *)a;
 626
 627         ceph_crypto_key_destroy(&au->session_key);
 628         ceph_buffer_put(au->buf);
 629         kfree(au);
 630 }
 631
 632
 633 static void ceph_x_reset(struct ceph_auth_client *ac)
 634 {
 635         struct ceph_x_info *xi = ac->private;
 636
 637         dout("reset\n");
 638         xi->starting = true;
 639         xi->server_challenge = 0;
 640 }
 641
 642 static void ceph_x_destroy(struct ceph_auth_client *ac)
 643 {
 644         struct ceph_x_info *xi = ac->private;
 645         struct rb_node *p;
 646
 647         dout("ceph_x_destroy %p\n", ac);
 648         ceph_crypto_key_destroy(&xi->secret);
 649
 650         while ((p = rb_first(&xi->ticket_handlers)) != NULL) {
 651                 struct ceph_x_ticket_handler *th =
 652                         rb_entry(p, struct ceph_x_ticket_handler, node);
 653                 remove_ticket_handler(ac, th);
 654         }
 655
 656         if (xi->auth_authorizer.buf)
 657                 ceph_buffer_put(xi->auth_authorizer.buf);
 658
 659         kfree(ac->private);
 660         ac->private = NULL;
 661 }
 662
 663 static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
 664                                    int peer_type)
 665 {
 666         struct ceph_x_ticket_handler *th;
 667
 668         th = get_ticket_handler(ac, peer_type);
 669         if (!IS_ERR(th))
 670                 memset(&th->validity, 0, sizeof(th->validity));
 671 }
 672
 673 static int calcu_signature(struct ceph_x_authorizer *au,
 674                            struct ceph_msg *msg, __le64 *sig)
 675 {
 676         int ret;
 677         char tmp_enc[40];
 678         __le32 tmp[5] = {
 679                 cpu_to_le32(16), msg->hdr.crc, msg->footer.front_crc,
 680                 msg->footer.middle_crc, msg->footer.data_crc,
 681         };
 682         ret = ceph_x_encrypt(&au->session_key, &tmp, sizeof(tmp),
 683                              tmp_enc, sizeof(tmp_enc));
 684         if (ret < 0)
 685                 return ret;
 686         *sig = *(__le64*)(tmp_enc + 4);
 687         return 0;
 688 }
 689
 690 static int ceph_x_sign_message(struct ceph_auth_handshake *auth,
 691                                struct ceph_msg *msg)
 692 {
 693         int ret;
 694         if (!auth->authorizer)
 695                 return 0;
 696         ret = calcu_signature((struct ceph_x_authorizer *)auth->authorizer,
 697                               msg, &msg->footer.sig);
 698         if (ret < 0)
 699                 return ret;
 700         msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED;
 701         return 0;
 702 }
 703
 704 static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth,
 705                                           struct ceph_msg *msg)
 706 {
 707         __le64 sig_check;
 708         int ret;
 709
 710         if (!auth->authorizer)
 711                 return 0;
 712         ret = calcu_signature((struct ceph_x_authorizer *)auth->authorizer,
 713                               msg, &sig_check);
 714         if (ret < 0)
 715                 return ret;
 716         if (sig_check == msg->footer.sig)
 717                 return 0;
 718         if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED)
 719                 dout("ceph_x_check_message_signature %p has signature %llx "
 720                      "expect %llx\n", msg, msg->footer.sig, sig_check);
 721         else
 722                 dout("ceph_x_check_message_signature %p sender did not set "
 723                      "CEPH_MSG_FOOTER_SIGNED\n", msg);
 724         return -EBADMSG;
 725 }
 726
 727 static const struct ceph_auth_client_ops ceph_x_ops = {
 728         .name = "x",
 729         .is_authenticated = ceph_x_is_authenticated,
 730         .should_authenticate = ceph_x_should_authenticate,
 731         .build_request = ceph_x_build_request,
 732         .handle_reply = ceph_x_handle_reply,
 733         .create_authorizer = ceph_x_create_authorizer,
 734         .update_authorizer = ceph_x_update_authorizer,
 735         .verify_authorizer_reply = ceph_x_verify_authorizer_reply,
 736         .destroy_authorizer = ceph_x_destroy_authorizer,
 737         .invalidate_authorizer = ceph_x_invalidate_authorizer,
 738         .reset =  ceph_x_reset,
 739         .destroy = ceph_x_destroy,
 740         .sign_message = ceph_x_sign_message,
 741         .check_message_signature = ceph_x_check_message_signature,
 742 };
 743
 744
 745 int ceph_x_init(struct ceph_auth_client *ac)
 746 {
 747         struct ceph_x_info *xi;
 748         int ret;
 749
 750         dout("ceph_x_init %p\n", ac);
 751         ret = -ENOMEM;
 752         xi = kzalloc(sizeof(*xi), GFP_NOFS);
 753         if (!xi)
 754                 goto out;
 755
 756         ret = -EINVAL;
 757         if (!ac->key) {
 758                 pr_err("no secret set (for auth_x protocol)\n");
 759                 goto out_nomem;
 760         }
 761
 762         ret = ceph_crypto_key_clone(&xi->secret, ac->key);
 763         if (ret < 0) {
 764                 pr_err("cannot clone key: %d\n", ret);
 765                 goto out_nomem;
 766         }
 767
 768         xi->starting = true;
 769         xi->ticket_handlers = RB_ROOT;
 770
 771         ac->protocol = CEPH_AUTH_CEPHX;
 772         ac->private = xi;
 773         ac->ops = &ceph_x_ops;
 774         return 0;
 775
 776 out_nomem:
 777         kfree(xi);
 778 out:
 779         return ret;
 780 }
 781
 782