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
  12 #include "crypto.h"
  13 #include "auth_x.h"
  14 #include "auth_x_protocol.h"
  15
  16 #define TEMP_TICKET_BUF_LEN     256
  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         ret = ceph_decrypt2(secret, &head, &head_len, obuf, &olen,
  79                             *p, len);
  80         if (ret)
  81                 return ret;
  82         if (head.struct_v != 1 || le64_to_cpu(head.magic) != CEPHX_ENC_MAGIC)
  83                 return -EPERM;
  84         *p += len;
  85         return olen;
  86 }
  87
  88 /*
  89  * get existing (or insert new) ticket handler
  90  */
  91 static struct ceph_x_ticket_handler *
  92 get_ticket_handler(struct ceph_auth_client *ac, int service)
  93 {
  94         struct ceph_x_ticket_handler *th;
  95         struct ceph_x_info *xi = ac->private;
  96         struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node;
  97
  98         while (*p) {
  99                 parent = *p;
 100                 th = rb_entry(parent, struct ceph_x_ticket_handler, node);
 101                 if (service < th->service)
 102                         p = &(*p)->rb_left;
 103                 else if (service > th->service)
 104                         p = &(*p)->rb_right;
 105                 else
 106                         return th;
 107         }
 108
 109         /* add it */
 110         th = kzalloc(sizeof(*th), GFP_NOFS);
 111         if (!th)
 112                 return ERR_PTR(-ENOMEM);
 113         th->service = service;
 114         rb_link_node(&th->node, parent, p);
 115         rb_insert_color(&th->node, &xi->ticket_handlers);
 116         return th;
 117 }
 118
 119 static void remove_ticket_handler(struct ceph_auth_client *ac,
 120                                   struct ceph_x_ticket_handler *th)
 121 {
 122         struct ceph_x_info *xi = ac->private;
 123
 124         dout("remove_ticket_handler %p %d\n", th, th->service);
 125         rb_erase(&th->node, &xi->ticket_handlers);
 126         ceph_crypto_key_destroy(&th->session_key);
 127         if (th->ticket_blob)
 128                 ceph_buffer_put(th->ticket_blob);
 129         kfree(th);
 130 }
 131
 132 static int process_one_ticket(struct ceph_auth_client *ac,
 133                               struct ceph_crypto_key *secret,
 134                               void **p, void *end,
 135                               void *dbuf, void *ticket_buf)
 136 {
 137         struct ceph_x_info *xi = ac->private;
 138         int type;
 139         u8 tkt_struct_v, blob_struct_v;
 140         struct ceph_x_ticket_handler *th;
 141         void *dp, *dend;
 142         int dlen;
 143         char is_enc;
 144         struct timespec validity;
 145         struct ceph_crypto_key old_key;
 146         void *tp, *tpend;
 147         struct ceph_timespec new_validity;
 148         struct ceph_crypto_key new_session_key;
 149         struct ceph_buffer *new_ticket_blob;
 150         unsigned long new_expires, new_renew_after;
 151         u64 new_secret_id;
 152         int ret;
 153
 154         ceph_decode_need(p, end, sizeof(u32) + 1, bad);
 155
 156         type = ceph_decode_32(p);
 157         dout(" ticket type %d %s\n", type, ceph_entity_type_name(type));
 158
 159         tkt_struct_v = ceph_decode_8(p);
 160         if (tkt_struct_v != 1)
 161                 goto bad;
 162
 163         th = get_ticket_handler(ac, type);
 164         if (IS_ERR(th)) {
 165                 ret = PTR_ERR(th);
 166                 goto out;
 167         }
 168
 169         /* blob for me */
 170         dlen = ceph_x_decrypt(secret, p, end, dbuf,
 171                               TEMP_TICKET_BUF_LEN);
 172         if (dlen <= 0) {
 173                 ret = dlen;
 174                 goto out;
 175         }
 176         dout(" decrypted %d bytes\n", dlen);
 177         dp = dbuf;
 178         dend = dp + dlen;
 179
 180         tkt_struct_v = ceph_decode_8(&dp);
 181         if (tkt_struct_v != 1)
 182                 goto bad;
 183
 184         memcpy(&old_key, &th->session_key, sizeof(old_key));
 185         ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
 186         if (ret)
 187                 goto out;
 188
 189         ceph_decode_copy(&dp, &new_validity, sizeof(new_validity));
 190         ceph_decode_timespec(&validity, &new_validity);
 191         new_expires = get_seconds() + validity.tv_sec;
 192         new_renew_after = new_expires - (validity.tv_sec / 4);
 193         dout(" expires=%lu renew_after=%lu\n", new_expires,
 194              new_renew_after);
 195
 196         /* ticket blob for service */
 197         ceph_decode_8_safe(p, end, is_enc, bad);
 198         tp = ticket_buf;
 199         if (is_enc) {
 200                 /* encrypted */
 201                 dout(" encrypted ticket\n");
 202                 dlen = ceph_x_decrypt(&old_key, p, end, ticket_buf,
 203                                       TEMP_TICKET_BUF_LEN);
 204                 if (dlen < 0) {
 205                         ret = dlen;
 206                         goto out;
 207                 }
 208                 dlen = ceph_decode_32(&tp);
 209         } else {
 210                 /* unencrypted */
 211                 ceph_decode_32_safe(p, end, dlen, bad);
 212                 ceph_decode_need(p, end, dlen, bad);
 213                 ceph_decode_copy(p, ticket_buf, dlen);
 214         }
 215         tpend = tp + dlen;
 216         dout(" ticket blob is %d bytes\n", dlen);
 217         ceph_decode_need(&tp, tpend, 1 + sizeof(u64), bad);
 218         blob_struct_v = ceph_decode_8(&tp);
 219         new_secret_id = ceph_decode_64(&tp);
 220         ret = ceph_decode_buffer(&new_ticket_blob, &tp, tpend);
 221         if (ret)
 222                 goto out;
 223
 224         /* all is well, update our ticket */
 225         ceph_crypto_key_destroy(&th->session_key);
 226         if (th->ticket_blob)
 227                 ceph_buffer_put(th->ticket_blob);
 228         th->session_key = new_session_key;
 229         th->ticket_blob = new_ticket_blob;
 230         th->validity = new_validity;
 231         th->secret_id = new_secret_id;
 232         th->expires = new_expires;
 233         th->renew_after = new_renew_after;
 234         dout(" got ticket service %d (%s) secret_id %lld len %d\n",
 235              type, ceph_entity_type_name(type), th->secret_id,
 236              (int)th->ticket_blob->vec.iov_len);
 237         xi->have_keys |= th->service;
 238
 239 out:
 240         return ret;
 241
 242 bad:
 243         ret = -EINVAL;
 244         goto out;
 245 }
 246
 247 static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
 248                                     struct ceph_crypto_key *secret,
 249                                     void *buf, void *end)
 250 {
 251         void *p = buf;
 252         char *dbuf;
 253         char *ticket_buf;
 254         u8 reply_struct_v;
 255         u32 num;
 256         int ret;
 257
 258         dbuf = kmalloc(TEMP_TICKET_BUF_LEN, GFP_NOFS);
 259         if (!dbuf)
 260                 return -ENOMEM;
 261
 262         ret = -ENOMEM;
 263         ticket_buf = kmalloc(TEMP_TICKET_BUF_LEN, GFP_NOFS);
 264         if (!ticket_buf)
 265                 goto out_dbuf;
 266
 267         ceph_decode_8_safe(&p, end, reply_struct_v, bad);
 268         if (reply_struct_v != 1)
 269                 return -EINVAL;
 270
 271         ceph_decode_32_safe(&p, end, num, bad);
 272         dout("%d tickets\n", num);
 273
 274         while (num--) {
 275                 ret = process_one_ticket(ac, secret, &p, end,
 276                                          dbuf, ticket_buf);
 277                 if (ret)
 278                         goto out;
 279         }
 280
 281         ret = 0;
 282 out:
 283         kfree(ticket_buf);
 284 out_dbuf:
 285         kfree(dbuf);
 286         return ret;
 287
 288 bad:
 289         ret = -EINVAL;
 290         goto out;
 291 }
 292
 293 static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
 294                                    struct ceph_x_ticket_handler *th,
 295                                    struct ceph_x_authorizer *au)
 296 {
 297         int maxlen;
 298         struct ceph_x_authorize_a *msg_a;
 299         struct ceph_x_authorize_b msg_b;
 300         void *p, *end;
 301         int ret;
 302         int ticket_blob_len =
 303                 (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0);
 304
 305         dout("build_authorizer for %s %p\n",
 306              ceph_entity_type_name(th->service), au);
 307
 308         maxlen = sizeof(*msg_a) + sizeof(msg_b) +
 309                 ceph_x_encrypt_buflen(ticket_blob_len);
 310         dout("  need len %d\n", maxlen);
 311         if (au->buf && au->buf->alloc_len < maxlen) {
 312                 ceph_buffer_put(au->buf);
 313                 au->buf = NULL;
 314         }
 315         if (!au->buf) {
 316                 au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
 317                 if (!au->buf)
 318                         return -ENOMEM;
 319         }
 320         au->service = th->service;
 321
 322         msg_a = au->buf->vec.iov_base;
 323         msg_a->struct_v = 1;
 324         msg_a->global_id = cpu_to_le64(ac->global_id);
 325         msg_a->service_id = cpu_to_le32(th->service);
 326         msg_a->ticket_blob.struct_v = 1;
 327         msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
 328         msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
 329         if (ticket_blob_len) {
 330                 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
 331                        th->ticket_blob->vec.iov_len);
 332         }
 333         dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
 334              le64_to_cpu(msg_a->ticket_blob.secret_id));
 335
 336         p = msg_a + 1;
 337         p += ticket_blob_len;
 338         end = au->buf->vec.iov_base + au->buf->vec.iov_len;
 339
 340         get_random_bytes(&au->nonce, sizeof(au->nonce));
 341         msg_b.struct_v = 1;
 342         msg_b.nonce = cpu_to_le64(au->nonce);
 343         ret = ceph_x_encrypt(&th->session_key, &msg_b, sizeof(msg_b),
 344                              p, end - p);
 345         if (ret < 0)
 346                 goto out_buf;
 347         p += ret;
 348         au->buf->vec.iov_len = p - au->buf->vec.iov_base;
 349         dout(" built authorizer nonce %llx len %d\n", au->nonce,
 350              (int)au->buf->vec.iov_len);
 351         BUG_ON(au->buf->vec.iov_len > maxlen);
 352         return 0;
 353
 354 out_buf:
 355         ceph_buffer_put(au->buf);
 356         au->buf = NULL;
 357         return ret;
 358 }
 359
 360 static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
 361                                 void **p, void *end)
 362 {
 363         ceph_decode_need(p, end, 1 + sizeof(u64), bad);
 364         ceph_encode_8(p, 1);
 365         ceph_encode_64(p, th->secret_id);
 366         if (th->ticket_blob) {
 367                 const char *buf = th->ticket_blob->vec.iov_base;
 368                 u32 len = th->ticket_blob->vec.iov_len;
 369
 370                 ceph_encode_32_safe(p, end, len, bad);
 371                 ceph_encode_copy_safe(p, end, buf, len, bad);
 372         } else {
 373                 ceph_encode_32_safe(p, end, 0, bad);
 374         }
 375
 376         return 0;
 377 bad:
 378         return -ERANGE;
 379 }
 380
 381 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
 382 {
 383         int want = ac->want_keys;
 384         struct ceph_x_info *xi = ac->private;
 385         int service;
 386
 387         *pneed = ac->want_keys & ~(xi->have_keys);
 388
 389         for (service = 1; service <= want; service <<= 1) {
 390                 struct ceph_x_ticket_handler *th;
 391
 392                 if (!(ac->want_keys & service))
 393                         continue;
 394
 395                 if (*pneed & service)
 396                         continue;
 397
 398                 th = get_ticket_handler(ac, service);
 399
 400                 if (IS_ERR(th)) {
 401                         *pneed |= service;
 402                         continue;
 403                 }
 404
 405                 if (get_seconds() >= th->renew_after)
 406                         *pneed |= service;
 407                 if (get_seconds() >= th->expires)
 408                         xi->have_keys &= ~service;
 409         }
 410 }
 411
 412
 413 static int ceph_x_build_request(struct ceph_auth_client *ac,
 414                                 void *buf, void *end)
 415 {
 416         struct ceph_x_info *xi = ac->private;
 417         int need;
 418         struct ceph_x_request_header *head = buf;
 419         int ret;
 420         struct ceph_x_ticket_handler *th =
 421                 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 422
 423         if (IS_ERR(th))
 424                 return PTR_ERR(th);
 425
 426         ceph_x_validate_tickets(ac, &need);
 427
 428         dout("build_request want %x have %x need %x\n",
 429              ac->want_keys, xi->have_keys, need);
 430
 431         if (need & CEPH_ENTITY_TYPE_AUTH) {
 432                 struct ceph_x_authenticate *auth = (void *)(head + 1);
 433                 void *p = auth + 1;
 434                 struct ceph_x_challenge_blob tmp;
 435                 char tmp_enc[40];
 436                 u64 *u;
 437
 438                 if (p > end)
 439                         return -ERANGE;
 440
 441                 dout(" get_auth_session_key\n");
 442                 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
 443
 444                 /* encrypt and hash */
 445                 get_random_bytes(&auth->client_challenge, sizeof(u64));
 446                 tmp.client_challenge = auth->client_challenge;
 447                 tmp.server_challenge = cpu_to_le64(xi->server_challenge);
 448                 ret = ceph_x_encrypt(&xi->secret, &tmp, sizeof(tmp),
 449                                      tmp_enc, sizeof(tmp_enc));
 450                 if (ret < 0)
 451                         return ret;
 452
 453                 auth->struct_v = 1;
 454                 auth->key = 0;
 455                 for (u = (u64 *)tmp_enc; u + 1 <= (u64 *)(tmp_enc + ret); u++)
 456                         auth->key ^= *(__le64 *)u;
 457                 dout(" server_challenge %llx client_challenge %llx key %llx\n",
 458                      xi->server_challenge, le64_to_cpu(auth->client_challenge),
 459                      le64_to_cpu(auth->key));
 460
 461                 /* now encode the old ticket if exists */
 462                 ret = ceph_x_encode_ticket(th, &p, end);
 463                 if (ret < 0)
 464                         return ret;
 465
 466                 return p - buf;
 467         }
 468
 469         if (need) {
 470                 void *p = head + 1;
 471                 struct ceph_x_service_ticket_request *req;
 472
 473                 if (p > end)
 474                         return -ERANGE;
 475                 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
 476
 477                 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
 478                 if (ret)
 479                         return ret;
 480                 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
 481                                  xi->auth_authorizer.buf->vec.iov_len);
 482
 483                 req = p;
 484                 req->keys = cpu_to_le32(need);
 485                 p += sizeof(*req);
 486                 return p - buf;
 487         }
 488
 489         return 0;
 490 }
 491
 492 static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
 493                                void *buf, void *end)
 494 {
 495         struct ceph_x_info *xi = ac->private;
 496         struct ceph_x_reply_header *head = buf;
 497         struct ceph_x_ticket_handler *th;
 498         int len = end - buf;
 499         int op;
 500         int ret;
 501
 502         if (result)
 503                 return result;  /* XXX hmm? */
 504
 505         if (xi->starting) {
 506                 /* it's a hello */
 507                 struct ceph_x_server_challenge *sc = buf;
 508
 509                 if (len != sizeof(*sc))
 510                         return -EINVAL;
 511                 xi->server_challenge = le64_to_cpu(sc->server_challenge);
 512                 dout("handle_reply got server challenge %llx\n",
 513                      xi->server_challenge);
 514                 xi->starting = false;
 515                 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
 516                 return -EAGAIN;
 517         }
 518
 519         op = le16_to_cpu(head->op);
 520         result = le32_to_cpu(head->result);
 521         dout("handle_reply op %d result %d\n", op, result);
 522         switch (op) {
 523         case CEPHX_GET_AUTH_SESSION_KEY:
 524                 /* verify auth key */
 525                 ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
 526                                                buf + sizeof(*head), end);
 527                 break;
 528
 529         case CEPHX_GET_PRINCIPAL_SESSION_KEY:
 530                 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 531                 if (IS_ERR(th))
 532                         return PTR_ERR(th);
 533                 ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
 534                                                buf + sizeof(*head), end);
 535                 break;
 536
 537         default:
 538                 return -EINVAL;
 539         }
 540         if (ret)
 541                 return ret;
 542         if (ac->want_keys == xi->have_keys)
 543                 return 0;
 544         return -EAGAIN;
 545 }
 546
 547 static int ceph_x_create_authorizer(
 548         struct ceph_auth_client *ac, int peer_type,
 549         struct ceph_authorizer **a,
 550         void **buf, size_t *len,
 551         void **reply_buf, size_t *reply_len)
 552 {
 553         struct ceph_x_authorizer *au;
 554         struct ceph_x_ticket_handler *th;
 555         int ret;
 556
 557         th = get_ticket_handler(ac, peer_type);
 558         if (IS_ERR(th))
 559                 return PTR_ERR(th);
 560
 561         au = kzalloc(sizeof(*au), GFP_NOFS);
 562         if (!au)
 563                 return -ENOMEM;
 564
 565         ret = ceph_x_build_authorizer(ac, th, au);
 566         if (ret) {
 567                 kfree(au);
 568                 return ret;
 569         }
 570
 571         *a = (struct ceph_authorizer *)au;
 572         *buf = au->buf->vec.iov_base;
 573         *len = au->buf->vec.iov_len;
 574         *reply_buf = au->reply_buf;
 575         *reply_len = sizeof(au->reply_buf);
 576         return 0;
 577 }
 578
 579 static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
 580                                           struct ceph_authorizer *a, size_t len)
 581 {
 582         struct ceph_x_authorizer *au = (void *)a;
 583         struct ceph_x_ticket_handler *th;
 584         int ret = 0;
 585         struct ceph_x_authorize_reply reply;
 586         void *p = au->reply_buf;
 587         void *end = p + sizeof(au->reply_buf);
 588
 589         th = get_ticket_handler(ac, au->service);
 590         if (IS_ERR(th))
 591                 return PTR_ERR(th);
 592         ret = ceph_x_decrypt(&th->session_key, &p, end, &reply, sizeof(reply));
 593         if (ret < 0)
 594                 return ret;
 595         if (ret != sizeof(reply))
 596                 return -EPERM;
 597
 598         if (au->nonce + 1 != le64_to_cpu(reply.nonce_plus_one))
 599                 ret = -EPERM;
 600         else
 601                 ret = 0;
 602         dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
 603              au->nonce, le64_to_cpu(reply.nonce_plus_one), ret);
 604         return ret;
 605 }
 606
 607 static void ceph_x_destroy_authorizer(struct ceph_auth_client *ac,
 608                                       struct ceph_authorizer *a)
 609 {
 610         struct ceph_x_authorizer *au = (void *)a;
 611
 612         ceph_buffer_put(au->buf);
 613         kfree(au);
 614 }
 615
 616
 617 static void ceph_x_reset(struct ceph_auth_client *ac)
 618 {
 619         struct ceph_x_info *xi = ac->private;
 620
 621         dout("reset\n");
 622         xi->starting = true;
 623         xi->server_challenge = 0;
 624 }
 625
 626 static void ceph_x_destroy(struct ceph_auth_client *ac)
 627 {
 628         struct ceph_x_info *xi = ac->private;
 629         struct rb_node *p;
 630
 631         dout("ceph_x_destroy %p\n", ac);
 632         ceph_crypto_key_destroy(&xi->secret);
 633
 634         while ((p = rb_first(&xi->ticket_handlers)) != NULL) {
 635                 struct ceph_x_ticket_handler *th =
 636                         rb_entry(p, struct ceph_x_ticket_handler, node);
 637                 remove_ticket_handler(ac, th);
 638         }
 639
 640         if (xi->auth_authorizer.buf)
 641                 ceph_buffer_put(xi->auth_authorizer.buf);
 642
 643         kfree(ac->private);
 644         ac->private = NULL;
 645 }
 646
 647 static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
 648                                    int peer_type)
 649 {
 650         struct ceph_x_ticket_handler *th;
 651
 652         th = get_ticket_handler(ac, peer_type);
 653         if (!IS_ERR(th))
 654                 remove_ticket_handler(ac, th);
 655 }
 656
 657
 658 static const struct ceph_auth_client_ops ceph_x_ops = {
 659         .name = "x",
 660         .is_authenticated = ceph_x_is_authenticated,
 661         .should_authenticate = ceph_x_should_authenticate,
 662         .build_request = ceph_x_build_request,
 663         .handle_reply = ceph_x_handle_reply,
 664         .create_authorizer = ceph_x_create_authorizer,
 665         .verify_authorizer_reply = ceph_x_verify_authorizer_reply,
 666         .destroy_authorizer = ceph_x_destroy_authorizer,
 667         .invalidate_authorizer = ceph_x_invalidate_authorizer,
 668         .reset =  ceph_x_reset,
 669         .destroy = ceph_x_destroy,
 670 };
 671
 672
 673 int ceph_x_init(struct ceph_auth_client *ac)
 674 {
 675         struct ceph_x_info *xi;
 676         int ret;
 677
 678         dout("ceph_x_init %p\n", ac);
 679         ret = -ENOMEM;
 680         xi = kzalloc(sizeof(*xi), GFP_NOFS);
 681         if (!xi)
 682                 goto out;
 683
 684         ret = -EINVAL;
 685         if (!ac->key) {
 686                 pr_err("no secret set (for auth_x protocol)\n");
 687                 goto out_nomem;
 688         }
 689
 690         ret = ceph_crypto_key_clone(&xi->secret, ac->key);
 691         if (ret < 0) {
 692                 pr_err("cannot clone key: %d\n", ret);
 693                 goto out_nomem;
 694         }
 695
 696         xi->starting = true;
 697         xi->ticket_handlers = RB_ROOT;
 698
 699         ac->protocol = CEPH_AUTH_CEPHX;
 700         ac->private = xi;
 701         ac->ops = &ceph_x_ops;
 702         return 0;
 703
 704 out_nomem:
 705         kfree(xi);
 706 out:
 707         return ret;
 708 }
 709
 710