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 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 void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
 387 {
 388         int want = ac->want_keys;
 389         struct ceph_x_info *xi = ac->private;
 390         int service;
 391
 392         *pneed = ac->want_keys & ~(xi->have_keys);
 393
 394         for (service = 1; service <= want; service <<= 1) {
 395                 struct ceph_x_ticket_handler *th;
 396
 397                 if (!(ac->want_keys & service))
 398                         continue;
 399
 400                 if (*pneed & service)
 401                         continue;
 402
 403                 th = get_ticket_handler(ac, service);
 404
 405                 if (IS_ERR(th)) {
 406                         *pneed |= service;
 407                         continue;
 408                 }
 409
 410                 if (get_seconds() >= th->renew_after)
 411                         *pneed |= service;
 412                 if (get_seconds() >= th->expires)
 413                         xi->have_keys &= ~service;
 414         }
 415 }
 416
 417
 418 static int ceph_x_build_request(struct ceph_auth_client *ac,
 419                                 void *buf, void *end)
 420 {
 421         struct ceph_x_info *xi = ac->private;
 422         int need;
 423         struct ceph_x_request_header *head = buf;
 424         int ret;
 425         struct ceph_x_ticket_handler *th =
 426                 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 427
 428         if (IS_ERR(th))
 429                 return PTR_ERR(th);
 430
 431         ceph_x_validate_tickets(ac, &need);
 432
 433         dout("build_request want %x have %x need %x\n",
 434              ac->want_keys, xi->have_keys, need);
 435
 436         if (need & CEPH_ENTITY_TYPE_AUTH) {
 437                 struct ceph_x_authenticate *auth = (void *)(head + 1);
 438                 void *p = auth + 1;
 439                 struct ceph_x_challenge_blob tmp;
 440                 char tmp_enc[40];
 441                 u64 *u;
 442
 443                 if (p > end)
 444                         return -ERANGE;
 445
 446                 dout(" get_auth_session_key\n");
 447                 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
 448
 449                 /* encrypt and hash */
 450                 get_random_bytes(&auth->client_challenge, sizeof(u64));
 451                 tmp.client_challenge = auth->client_challenge;
 452                 tmp.server_challenge = cpu_to_le64(xi->server_challenge);
 453                 ret = ceph_x_encrypt(&xi->secret, &tmp, sizeof(tmp),
 454                                      tmp_enc, sizeof(tmp_enc));
 455                 if (ret < 0)
 456                         return ret;
 457
 458                 auth->struct_v = 1;
 459                 auth->key = 0;
 460                 for (u = (u64 *)tmp_enc; u + 1 <= (u64 *)(tmp_enc + ret); u++)
 461                         auth->key ^= *(__le64 *)u;
 462                 dout(" server_challenge %llx client_challenge %llx key %llx\n",
 463                      xi->server_challenge, le64_to_cpu(auth->client_challenge),
 464                      le64_to_cpu(auth->key));
 465
 466                 /* now encode the old ticket if exists */
 467                 ret = ceph_x_encode_ticket(th, &p, end);
 468                 if (ret < 0)
 469                         return ret;
 470
 471                 return p - buf;
 472         }
 473
 474         if (need) {
 475                 void *p = head + 1;
 476                 struct ceph_x_service_ticket_request *req;
 477
 478                 if (p > end)
 479                         return -ERANGE;
 480                 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
 481
 482                 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
 483                 if (ret)
 484                         return ret;
 485                 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
 486                                  xi->auth_authorizer.buf->vec.iov_len);
 487
 488                 req = p;
 489                 req->keys = cpu_to_le32(need);
 490                 p += sizeof(*req);
 491                 return p - buf;
 492         }
 493
 494         return 0;
 495 }
 496
 497 static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
 498                                void *buf, void *end)
 499 {
 500         struct ceph_x_info *xi = ac->private;
 501         struct ceph_x_reply_header *head = buf;
 502         struct ceph_x_ticket_handler *th;
 503         int len = end - buf;
 504         int op;
 505         int ret;
 506
 507         if (result)
 508                 return result;  /* XXX hmm? */
 509
 510         if (xi->starting) {
 511                 /* it's a hello */
 512                 struct ceph_x_server_challenge *sc = buf;
 513
 514                 if (len != sizeof(*sc))
 515                         return -EINVAL;
 516                 xi->server_challenge = le64_to_cpu(sc->server_challenge);
 517                 dout("handle_reply got server challenge %llx\n",
 518                      xi->server_challenge);
 519                 xi->starting = false;
 520                 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
 521                 return -EAGAIN;
 522         }
 523
 524         op = le16_to_cpu(head->op);
 525         result = le32_to_cpu(head->result);
 526         dout("handle_reply op %d result %d\n", op, result);
 527         switch (op) {
 528         case CEPHX_GET_AUTH_SESSION_KEY:
 529                 /* verify auth key */
 530                 ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
 531                                                buf + sizeof(*head), end);
 532                 break;
 533
 534         case CEPHX_GET_PRINCIPAL_SESSION_KEY:
 535                 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 536                 if (IS_ERR(th))
 537                         return PTR_ERR(th);
 538                 ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
 539                                                buf + sizeof(*head), end);
 540                 break;
 541
 542         default:
 543                 return -EINVAL;
 544         }
 545         if (ret)
 546                 return ret;
 547         if (ac->want_keys == xi->have_keys)
 548                 return 0;
 549         return -EAGAIN;
 550 }
 551
 552 static int ceph_x_create_authorizer(
 553         struct ceph_auth_client *ac, int peer_type,
 554         struct ceph_auth_handshake *auth)
 555 {
 556         struct ceph_x_authorizer *au;
 557         struct ceph_x_ticket_handler *th;
 558         int ret;
 559
 560         th = get_ticket_handler(ac, peer_type);
 561         if (IS_ERR(th))
 562                 return PTR_ERR(th);
 563
 564         au = kzalloc(sizeof(*au), GFP_NOFS);
 565         if (!au)
 566                 return -ENOMEM;
 567
 568         ret = ceph_x_build_authorizer(ac, th, au);
 569         if (ret) {
 570                 kfree(au);
 571                 return ret;
 572         }
 573
 574         auth->authorizer = (struct ceph_authorizer *) au;
 575         auth->authorizer_buf = au->buf->vec.iov_base;
 576         auth->authorizer_buf_len = au->buf->vec.iov_len;
 577         auth->authorizer_reply_buf = au->reply_buf;
 578         auth->authorizer_reply_buf_len = sizeof (au->reply_buf);
 579         auth->sign_message = ac->ops->sign_message;
 580         auth->check_message_signature = ac->ops->check_message_signature;
 581
 582         return 0;
 583 }
 584
 585 static int ceph_x_update_authorizer(
 586         struct ceph_auth_client *ac, int peer_type,
 587         struct ceph_auth_handshake *auth)
 588 {
 589         struct ceph_x_authorizer *au;
 590         struct ceph_x_ticket_handler *th;
 591
 592         th = get_ticket_handler(ac, peer_type);
 593         if (IS_ERR(th))
 594                 return PTR_ERR(th);
 595
 596         au = (struct ceph_x_authorizer *)auth->authorizer;
 597         if (au->secret_id < th->secret_id) {
 598                 dout("ceph_x_update_authorizer service %u secret %llu < %llu\n",
 599                      au->service, au->secret_id, th->secret_id);
 600                 return ceph_x_build_authorizer(ac, th, au);
 601         }
 602         return 0;
 603 }
 604
 605 static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
 606                                           struct ceph_authorizer *a, size_t len)
 607 {
 608         struct ceph_x_authorizer *au = (void *)a;
 609         int ret = 0;
 610         struct ceph_x_authorize_reply reply;
 611         void *preply = &reply;
 612         void *p = au->reply_buf;
 613         void *end = p + sizeof(au->reply_buf);
 614
 615         ret = ceph_x_decrypt(&au->session_key, &p, end, &preply, sizeof(reply));
 616         if (ret < 0)
 617                 return ret;
 618         if (ret != sizeof(reply))
 619                 return -EPERM;
 620
 621         if (au->nonce + 1 != le64_to_cpu(reply.nonce_plus_one))
 622                 ret = -EPERM;
 623         else
 624                 ret = 0;
 625         dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
 626              au->nonce, le64_to_cpu(reply.nonce_plus_one), ret);
 627         return ret;
 628 }
 629
 630 static void ceph_x_destroy_authorizer(struct ceph_auth_client *ac,
 631                                       struct ceph_authorizer *a)
 632 {
 633         struct ceph_x_authorizer *au = (void *)a;
 634
 635         ceph_x_authorizer_cleanup(au);
 636         kfree(au);
 637 }
 638
 639
 640 static void ceph_x_reset(struct ceph_auth_client *ac)
 641 {
 642         struct ceph_x_info *xi = ac->private;
 643
 644         dout("reset\n");
 645         xi->starting = true;
 646         xi->server_challenge = 0;
 647 }
 648
 649 static void ceph_x_destroy(struct ceph_auth_client *ac)
 650 {
 651         struct ceph_x_info *xi = ac->private;
 652         struct rb_node *p;
 653
 654         dout("ceph_x_destroy %p\n", ac);
 655         ceph_crypto_key_destroy(&xi->secret);
 656
 657         while ((p = rb_first(&xi->ticket_handlers)) != NULL) {
 658                 struct ceph_x_ticket_handler *th =
 659                         rb_entry(p, struct ceph_x_ticket_handler, node);
 660                 remove_ticket_handler(ac, th);
 661         }
 662
 663         ceph_x_authorizer_cleanup(&xi->auth_authorizer);
 664
 665         kfree(ac->private);
 666         ac->private = NULL;
 667 }
 668
 669 static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
 670                                    int peer_type)
 671 {
 672         struct ceph_x_ticket_handler *th;
 673
 674         th = get_ticket_handler(ac, peer_type);
 675         if (!IS_ERR(th))
 676                 memset(&th->validity, 0, sizeof(th->validity));
 677 }
 678
 679 static int calcu_signature(struct ceph_x_authorizer *au,
 680                            struct ceph_msg *msg, __le64 *sig)
 681 {
 682         int ret;
 683         char tmp_enc[40];
 684         __le32 tmp[5] = {
 685                 cpu_to_le32(16), msg->hdr.crc, msg->footer.front_crc,
 686                 msg->footer.middle_crc, msg->footer.data_crc,
 687         };
 688         ret = ceph_x_encrypt(&au->session_key, &tmp, sizeof(tmp),
 689                              tmp_enc, sizeof(tmp_enc));
 690         if (ret < 0)
 691                 return ret;
 692         *sig = *(__le64*)(tmp_enc + 4);
 693         return 0;
 694 }
 695
 696 static int ceph_x_sign_message(struct ceph_auth_handshake *auth,
 697                                struct ceph_msg *msg)
 698 {
 699         int ret;
 700         if (!auth->authorizer)
 701                 return 0;
 702         ret = calcu_signature((struct ceph_x_authorizer *)auth->authorizer,
 703                               msg, &msg->footer.sig);
 704         if (ret < 0)
 705                 return ret;
 706         msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED;
 707         return 0;
 708 }
 709
 710 static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth,
 711                                           struct ceph_msg *msg)
 712 {
 713         __le64 sig_check;
 714         int ret;
 715
 716         if (!auth->authorizer)
 717                 return 0;
 718         ret = calcu_signature((struct ceph_x_authorizer *)auth->authorizer,
 719                               msg, &sig_check);
 720         if (ret < 0)
 721                 return ret;
 722         if (sig_check == msg->footer.sig)
 723                 return 0;
 724         if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED)
 725                 dout("ceph_x_check_message_signature %p has signature %llx "
 726                      "expect %llx\n", msg, msg->footer.sig, sig_check);
 727         else
 728                 dout("ceph_x_check_message_signature %p sender did not set "
 729                      "CEPH_MSG_FOOTER_SIGNED\n", msg);
 730         return -EBADMSG;
 731 }
 732
 733 static const struct ceph_auth_client_ops ceph_x_ops = {
 734         .name = "x",
 735         .is_authenticated = ceph_x_is_authenticated,
 736         .should_authenticate = ceph_x_should_authenticate,
 737         .build_request = ceph_x_build_request,
 738         .handle_reply = ceph_x_handle_reply,
 739         .create_authorizer = ceph_x_create_authorizer,
 740         .update_authorizer = ceph_x_update_authorizer,
 741         .verify_authorizer_reply = ceph_x_verify_authorizer_reply,
 742         .destroy_authorizer = ceph_x_destroy_authorizer,
 743         .invalidate_authorizer = ceph_x_invalidate_authorizer,
 744         .reset =  ceph_x_reset,
 745         .destroy = ceph_x_destroy,
 746         .sign_message = ceph_x_sign_message,
 747         .check_message_signature = ceph_x_check_message_signature,
 748 };
 749
 750
 751 int ceph_x_init(struct ceph_auth_client *ac)
 752 {
 753         struct ceph_x_info *xi;
 754         int ret;
 755
 756         dout("ceph_x_init %p\n", ac);
 757         ret = -ENOMEM;
 758         xi = kzalloc(sizeof(*xi), GFP_NOFS);
 759         if (!xi)
 760                 goto out;
 761
 762         ret = -EINVAL;
 763         if (!ac->key) {
 764                 pr_err("no secret set (for auth_x protocol)\n");
 765                 goto out_nomem;
 766         }
 767
 768         ret = ceph_crypto_key_clone(&xi->secret, ac->key);
 769         if (ret < 0) {
 770                 pr_err("cannot clone key: %d\n", ret);
 771                 goto out_nomem;
 772         }
 773
 774         xi->starting = true;
 775         xi->ticket_handlers = RB_ROOT;
 776
 777         ac->protocol = CEPH_AUTH_CEPHX;
 778         ac->private = xi;
 779         ac->ops = &ceph_x_ops;
 780         return 0;
 781
 782 out_nomem:
 783         kfree(xi);
 784 out:
 785         return ret;
 786 }
 787
 788