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 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed);
  17
  18 static int ceph_x_is_authenticated(struct ceph_auth_client *ac)
  19 {
  20         struct ceph_x_info *xi = ac->private;
  21         int need;
  22
  23         ceph_x_validate_tickets(ac, &need);
  24         dout("ceph_x_is_authenticated want=%d need=%d have=%d\n",
  25              ac->want_keys, need, xi->have_keys);
  26         return (ac->want_keys & xi->have_keys) == ac->want_keys;
  27 }
  28
  29 static int ceph_x_should_authenticate(struct ceph_auth_client *ac)
  30 {
  31         struct ceph_x_info *xi = ac->private;
  32         int need;
  33
  34         ceph_x_validate_tickets(ac, &need);
  35         dout("ceph_x_should_authenticate want=%d need=%d have=%d\n",
  36              ac->want_keys, need, xi->have_keys);
  37         return need != 0;
  38 }
  39
  40 static int ceph_x_encrypt_buflen(int ilen)
  41 {
  42         return sizeof(struct ceph_x_encrypt_header) + ilen + 16 +
  43                 sizeof(u32);
  44 }
  45
  46 static int ceph_x_encrypt(struct ceph_crypto_key *secret,
  47                           void *ibuf, int ilen, void *obuf, size_t olen)
  48 {
  49         struct ceph_x_encrypt_header head = {
  50                 .struct_v = 1,
  51                 .magic = cpu_to_le64(CEPHX_ENC_MAGIC)
  52         };
  53         size_t len = olen - sizeof(u32);
  54         int ret;
  55
  56         ret = ceph_encrypt2(secret, obuf + sizeof(u32), &len,
  57                             &head, sizeof(head), ibuf, ilen);
  58         if (ret)
  59                 return ret;
  60         ceph_encode_32(&obuf, len);
  61         return len + sizeof(u32);
  62 }
  63
  64 static int ceph_x_decrypt(struct ceph_crypto_key *secret,
  65                           void **p, void *end, void **obuf, size_t olen)
  66 {
  67         struct ceph_x_encrypt_header head;
  68         size_t head_len = sizeof(head);
  69         int len, ret;
  70
  71         len = ceph_decode_32(p);
  72         if (*p + len > end)
  73                 return -EINVAL;
  74
  75         dout("ceph_x_decrypt len %d\n", len);
  76         if (*obuf == NULL) {
  77                 *obuf = kmalloc(len, GFP_NOFS);
  78                 if (!*obuf)
  79                         return -ENOMEM;
  80                 olen = len;
  81         }
  82
  83         ret = ceph_decrypt2(secret, &head, &head_len, *obuf, &olen, *p, len);
  84         if (ret)
  85                 return ret;
  86         if (head.struct_v != 1 || le64_to_cpu(head.magic) != CEPHX_ENC_MAGIC)
  87                 return -EPERM;
  88         *p += len;
  89         return olen;
  90 }
  91
  92 /*
  93  * get existing (or insert new) ticket handler
  94  */
  95 static struct ceph_x_ticket_handler *
  96 get_ticket_handler(struct ceph_auth_client *ac, int service)
  97 {
  98         struct ceph_x_ticket_handler *th;
  99         struct ceph_x_info *xi = ac->private;
 100         struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node;
 101
 102         while (*p) {
 103                 parent = *p;
 104                 th = rb_entry(parent, struct ceph_x_ticket_handler, node);
 105                 if (service < th->service)
 106                         p = &(*p)->rb_left;
 107                 else if (service > th->service)
 108                         p = &(*p)->rb_right;
 109                 else
 110                         return th;
 111         }
 112
 113         /* add it */
 114         th = kzalloc(sizeof(*th), GFP_NOFS);
 115         if (!th)
 116                 return ERR_PTR(-ENOMEM);
 117         th->service = service;
 118         rb_link_node(&th->node, parent, p);
 119         rb_insert_color(&th->node, &xi->ticket_handlers);
 120         return th;
 121 }
 122
 123 static void remove_ticket_handler(struct ceph_auth_client *ac,
 124                                   struct ceph_x_ticket_handler *th)
 125 {
 126         struct ceph_x_info *xi = ac->private;
 127
 128         dout("remove_ticket_handler %p %d\n", th, th->service);
 129         rb_erase(&th->node, &xi->ticket_handlers);
 130         ceph_crypto_key_destroy(&th->session_key);
 131         if (th->ticket_blob)
 132                 ceph_buffer_put(th->ticket_blob);
 133         kfree(th);
 134 }
 135
 136 static int process_one_ticket(struct ceph_auth_client *ac,
 137                               struct ceph_crypto_key *secret,
 138                               void **p, void *end)
 139 {
 140         struct ceph_x_info *xi = ac->private;
 141         int type;
 142         u8 tkt_struct_v, blob_struct_v;
 143         struct ceph_x_ticket_handler *th;
 144         void *dbuf = NULL;
 145         void *dp, *dend;
 146         int dlen;
 147         char is_enc;
 148         struct timespec validity;
 149         struct ceph_crypto_key old_key;
 150         void *ticket_buf = NULL;
 151         void *tp, *tpend;
 152         struct ceph_timespec new_validity;
 153         struct ceph_crypto_key new_session_key;
 154         struct ceph_buffer *new_ticket_blob;
 155         unsigned long new_expires, new_renew_after;
 156         u64 new_secret_id;
 157         int ret;
 158
 159         ceph_decode_need(p, end, sizeof(u32) + 1, bad);
 160
 161         type = ceph_decode_32(p);
 162         dout(" ticket type %d %s\n", type, ceph_entity_type_name(type));
 163
 164         tkt_struct_v = ceph_decode_8(p);
 165         if (tkt_struct_v != 1)
 166                 goto bad;
 167
 168         th = get_ticket_handler(ac, type);
 169         if (IS_ERR(th)) {
 170                 ret = PTR_ERR(th);
 171                 goto out;
 172         }
 173
 174         /* blob for me */
 175         dlen = ceph_x_decrypt(secret, p, end, &dbuf, 0);
 176         if (dlen <= 0) {
 177                 ret = dlen;
 178                 goto out;
 179         }
 180         dout(" decrypted %d bytes\n", dlen);
 181         dp = dbuf;
 182         dend = dp + dlen;
 183
 184         tkt_struct_v = ceph_decode_8(&dp);
 185         if (tkt_struct_v != 1)
 186                 goto bad;
 187
 188         memcpy(&old_key, &th->session_key, sizeof(old_key));
 189         ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
 190         if (ret)
 191                 goto out;
 192
 193         ceph_decode_copy(&dp, &new_validity, sizeof(new_validity));
 194         ceph_decode_timespec(&validity, &new_validity);
 195         new_expires = get_seconds() + validity.tv_sec;
 196         new_renew_after = new_expires - (validity.tv_sec / 4);
 197         dout(" expires=%lu renew_after=%lu\n", new_expires,
 198              new_renew_after);
 199
 200         /* ticket blob for service */
 201         ceph_decode_8_safe(p, end, is_enc, bad);
 202         if (is_enc) {
 203                 /* encrypted */
 204                 dout(" encrypted ticket\n");
 205                 dlen = ceph_x_decrypt(&old_key, p, end, &ticket_buf, 0);
 206                 if (dlen < 0) {
 207                         ret = dlen;
 208                         goto out;
 209                 }
 210                 tp = ticket_buf;
 211                 dlen = ceph_decode_32(&tp);
 212         } else {
 213                 /* unencrypted */
 214                 ceph_decode_32_safe(p, end, dlen, bad);
 215                 ticket_buf = kmalloc(dlen, GFP_NOFS);
 216                 if (!ticket_buf) {
 217                         ret = -ENOMEM;
 218                         goto out;
 219                 }
 220                 tp = ticket_buf;
 221                 ceph_decode_need(p, end, dlen, bad);
 222                 ceph_decode_copy(p, ticket_buf, dlen);
 223         }
 224         tpend = tp + dlen;
 225         dout(" ticket blob is %d bytes\n", dlen);
 226         ceph_decode_need(&tp, tpend, 1 + sizeof(u64), bad);
 227         blob_struct_v = ceph_decode_8(&tp);
 228         new_secret_id = ceph_decode_64(&tp);
 229         ret = ceph_decode_buffer(&new_ticket_blob, &tp, tpend);
 230         if (ret)
 231                 goto out;
 232
 233         /* all is well, update our ticket */
 234         ceph_crypto_key_destroy(&th->session_key);
 235         if (th->ticket_blob)
 236                 ceph_buffer_put(th->ticket_blob);
 237         th->session_key = new_session_key;
 238         th->ticket_blob = new_ticket_blob;
 239         th->validity = new_validity;
 240         th->secret_id = new_secret_id;
 241         th->expires = new_expires;
 242         th->renew_after = new_renew_after;
 243         dout(" got ticket service %d (%s) secret_id %lld len %d\n",
 244              type, ceph_entity_type_name(type), th->secret_id,
 245              (int)th->ticket_blob->vec.iov_len);
 246         xi->have_keys |= th->service;
 247
 248 out:
 249         kfree(ticket_buf);
 250         kfree(dbuf);
 251         return ret;
 252
 253 bad:
 254         ret = -EINVAL;
 255         goto out;
 256 }
 257
 258 static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
 259                                     struct ceph_crypto_key *secret,
 260                                     void *buf, void *end)
 261 {
 262         void *p = buf;
 263         u8 reply_struct_v;
 264         u32 num;
 265         int ret;
 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                 if (ret)
 277                         return ret;
 278         }
 279
 280         return 0;
 281
 282 bad:
 283         return -EINVAL;
 284 }
 285
 286 static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
 287                                    struct ceph_x_ticket_handler *th,
 288                                    struct ceph_x_authorizer *au)
 289 {
 290         int maxlen;
 291         struct ceph_x_authorize_a *msg_a;
 292         struct ceph_x_authorize_b msg_b;
 293         void *p, *end;
 294         int ret;
 295         int ticket_blob_len =
 296                 (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0);
 297
 298         dout("build_authorizer for %s %p\n",
 299              ceph_entity_type_name(th->service), au);
 300
 301         maxlen = sizeof(*msg_a) + sizeof(msg_b) +
 302                 ceph_x_encrypt_buflen(ticket_blob_len);
 303         dout("  need len %d\n", maxlen);
 304         if (au->buf && au->buf->alloc_len < maxlen) {
 305                 ceph_buffer_put(au->buf);
 306                 au->buf = NULL;
 307         }
 308         if (!au->buf) {
 309                 au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
 310                 if (!au->buf)
 311                         return -ENOMEM;
 312         }
 313         au->service = th->service;
 314
 315         msg_a = au->buf->vec.iov_base;
 316         msg_a->struct_v = 1;
 317         msg_a->global_id = cpu_to_le64(ac->global_id);
 318         msg_a->service_id = cpu_to_le32(th->service);
 319         msg_a->ticket_blob.struct_v = 1;
 320         msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
 321         msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
 322         if (ticket_blob_len) {
 323                 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
 324                        th->ticket_blob->vec.iov_len);
 325         }
 326         dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
 327              le64_to_cpu(msg_a->ticket_blob.secret_id));
 328
 329         p = msg_a + 1;
 330         p += ticket_blob_len;
 331         end = au->buf->vec.iov_base + au->buf->vec.iov_len;
 332
 333         get_random_bytes(&au->nonce, sizeof(au->nonce));
 334         msg_b.struct_v = 1;
 335         msg_b.nonce = cpu_to_le64(au->nonce);
 336         ret = ceph_x_encrypt(&th->session_key, &msg_b, sizeof(msg_b),
 337                              p, end - p);
 338         if (ret < 0)
 339                 goto out_buf;
 340         p += ret;
 341         au->buf->vec.iov_len = p - au->buf->vec.iov_base;
 342         dout(" built authorizer nonce %llx len %d\n", au->nonce,
 343              (int)au->buf->vec.iov_len);
 344         BUG_ON(au->buf->vec.iov_len > maxlen);
 345         return 0;
 346
 347 out_buf:
 348         ceph_buffer_put(au->buf);
 349         au->buf = NULL;
 350         return ret;
 351 }
 352
 353 static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
 354                                 void **p, void *end)
 355 {
 356         ceph_decode_need(p, end, 1 + sizeof(u64), bad);
 357         ceph_encode_8(p, 1);
 358         ceph_encode_64(p, th->secret_id);
 359         if (th->ticket_blob) {
 360                 const char *buf = th->ticket_blob->vec.iov_base;
 361                 u32 len = th->ticket_blob->vec.iov_len;
 362
 363                 ceph_encode_32_safe(p, end, len, bad);
 364                 ceph_encode_copy_safe(p, end, buf, len, bad);
 365         } else {
 366                 ceph_encode_32_safe(p, end, 0, bad);
 367         }
 368
 369         return 0;
 370 bad:
 371         return -ERANGE;
 372 }
 373
 374 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
 375 {
 376         int want = ac->want_keys;
 377         struct ceph_x_info *xi = ac->private;
 378         int service;
 379
 380         *pneed = ac->want_keys & ~(xi->have_keys);
 381
 382         for (service = 1; service <= want; service <<= 1) {
 383                 struct ceph_x_ticket_handler *th;
 384
 385                 if (!(ac->want_keys & service))
 386                         continue;
 387
 388                 if (*pneed & service)
 389                         continue;
 390
 391                 th = get_ticket_handler(ac, service);
 392
 393                 if (IS_ERR(th)) {
 394                         *pneed |= service;
 395                         continue;
 396                 }
 397
 398                 if (get_seconds() >= th->renew_after)
 399                         *pneed |= service;
 400                 if (get_seconds() >= th->expires)
 401                         xi->have_keys &= ~service;
 402         }
 403 }
 404
 405
 406 static int ceph_x_build_request(struct ceph_auth_client *ac,
 407                                 void *buf, void *end)
 408 {
 409         struct ceph_x_info *xi = ac->private;
 410         int need;
 411         struct ceph_x_request_header *head = buf;
 412         int ret;
 413         struct ceph_x_ticket_handler *th =
 414                 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 415
 416         if (IS_ERR(th))
 417                 return PTR_ERR(th);
 418
 419         ceph_x_validate_tickets(ac, &need);
 420
 421         dout("build_request want %x have %x need %x\n",
 422              ac->want_keys, xi->have_keys, need);
 423
 424         if (need & CEPH_ENTITY_TYPE_AUTH) {
 425                 struct ceph_x_authenticate *auth = (void *)(head + 1);
 426                 void *p = auth + 1;
 427                 struct ceph_x_challenge_blob tmp;
 428                 char tmp_enc[40];
 429                 u64 *u;
 430
 431                 if (p > end)
 432                         return -ERANGE;
 433
 434                 dout(" get_auth_session_key\n");
 435                 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
 436
 437                 /* encrypt and hash */
 438                 get_random_bytes(&auth->client_challenge, sizeof(u64));
 439                 tmp.client_challenge = auth->client_challenge;
 440                 tmp.server_challenge = cpu_to_le64(xi->server_challenge);
 441                 ret = ceph_x_encrypt(&xi->secret, &tmp, sizeof(tmp),
 442                                      tmp_enc, sizeof(tmp_enc));
 443                 if (ret < 0)
 444                         return ret;
 445
 446                 auth->struct_v = 1;
 447                 auth->key = 0;
 448                 for (u = (u64 *)tmp_enc; u + 1 <= (u64 *)(tmp_enc + ret); u++)
 449                         auth->key ^= *(__le64 *)u;
 450                 dout(" server_challenge %llx client_challenge %llx key %llx\n",
 451                      xi->server_challenge, le64_to_cpu(auth->client_challenge),
 452                      le64_to_cpu(auth->key));
 453
 454                 /* now encode the old ticket if exists */
 455                 ret = ceph_x_encode_ticket(th, &p, end);
 456                 if (ret < 0)
 457                         return ret;
 458
 459                 return p - buf;
 460         }
 461
 462         if (need) {
 463                 void *p = head + 1;
 464                 struct ceph_x_service_ticket_request *req;
 465
 466                 if (p > end)
 467                         return -ERANGE;
 468                 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
 469
 470                 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
 471                 if (ret)
 472                         return ret;
 473                 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
 474                                  xi->auth_authorizer.buf->vec.iov_len);
 475
 476                 req = p;
 477                 req->keys = cpu_to_le32(need);
 478                 p += sizeof(*req);
 479                 return p - buf;
 480         }
 481
 482         return 0;
 483 }
 484
 485 static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
 486                                void *buf, void *end)
 487 {
 488         struct ceph_x_info *xi = ac->private;
 489         struct ceph_x_reply_header *head = buf;
 490         struct ceph_x_ticket_handler *th;
 491         int len = end - buf;
 492         int op;
 493         int ret;
 494
 495         if (result)
 496                 return result;  /* XXX hmm? */
 497
 498         if (xi->starting) {
 499                 /* it's a hello */
 500                 struct ceph_x_server_challenge *sc = buf;
 501
 502                 if (len != sizeof(*sc))
 503                         return -EINVAL;
 504                 xi->server_challenge = le64_to_cpu(sc->server_challenge);
 505                 dout("handle_reply got server challenge %llx\n",
 506                      xi->server_challenge);
 507                 xi->starting = false;
 508                 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
 509                 return -EAGAIN;
 510         }
 511
 512         op = le16_to_cpu(head->op);
 513         result = le32_to_cpu(head->result);
 514         dout("handle_reply op %d result %d\n", op, result);
 515         switch (op) {
 516         case CEPHX_GET_AUTH_SESSION_KEY:
 517                 /* verify auth key */
 518                 ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
 519                                                buf + sizeof(*head), end);
 520                 break;
 521
 522         case CEPHX_GET_PRINCIPAL_SESSION_KEY:
 523                 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 524                 if (IS_ERR(th))
 525                         return PTR_ERR(th);
 526                 ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
 527                                                buf + sizeof(*head), end);
 528                 break;
 529
 530         default:
 531                 return -EINVAL;
 532         }
 533         if (ret)
 534                 return ret;
 535         if (ac->want_keys == xi->have_keys)
 536                 return 0;
 537         return -EAGAIN;
 538 }
 539
 540 static int ceph_x_create_authorizer(
 541         struct ceph_auth_client *ac, int peer_type,
 542         struct ceph_authorizer **a,
 543         void **buf, size_t *len,
 544         void **reply_buf, size_t *reply_len)
 545 {
 546         struct ceph_x_authorizer *au;
 547         struct ceph_x_ticket_handler *th;
 548         int ret;
 549
 550         th = get_ticket_handler(ac, peer_type);
 551         if (IS_ERR(th))
 552                 return PTR_ERR(th);
 553
 554         au = kzalloc(sizeof(*au), GFP_NOFS);
 555         if (!au)
 556                 return -ENOMEM;
 557
 558         ret = ceph_x_build_authorizer(ac, th, au);
 559         if (ret) {
 560                 kfree(au);
 561                 return ret;
 562         }
 563
 564         *a = (struct ceph_authorizer *)au;
 565         *buf = au->buf->vec.iov_base;
 566         *len = au->buf->vec.iov_len;
 567         *reply_buf = au->reply_buf;
 568         *reply_len = sizeof(au->reply_buf);
 569         return 0;
 570 }
 571
 572 static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
 573                                           struct ceph_authorizer *a, size_t len)
 574 {
 575         struct ceph_x_authorizer *au = (void *)a;
 576         struct ceph_x_ticket_handler *th;
 577         int ret = 0;
 578         struct ceph_x_authorize_reply reply;
 579         void *preply = &reply;
 580         void *p = au->reply_buf;
 581         void *end = p + sizeof(au->reply_buf);
 582
 583         th = get_ticket_handler(ac, au->service);
 584         if (IS_ERR(th))
 585                 return PTR_ERR(th);
 586         ret = ceph_x_decrypt(&th->session_key, &p, end, &preply, sizeof(reply));
 587         if (ret < 0)
 588                 return ret;
 589         if (ret != sizeof(reply))
 590                 return -EPERM;
 591
 592         if (au->nonce + 1 != le64_to_cpu(reply.nonce_plus_one))
 593                 ret = -EPERM;
 594         else
 595                 ret = 0;
 596         dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
 597              au->nonce, le64_to_cpu(reply.nonce_plus_one), ret);
 598         return ret;
 599 }
 600
 601 static void ceph_x_destroy_authorizer(struct ceph_auth_client *ac,
 602                                       struct ceph_authorizer *a)
 603 {
 604         struct ceph_x_authorizer *au = (void *)a;
 605
 606         ceph_buffer_put(au->buf);
 607         kfree(au);
 608 }
 609
 610
 611 static void ceph_x_reset(struct ceph_auth_client *ac)
 612 {
 613         struct ceph_x_info *xi = ac->private;
 614
 615         dout("reset\n");
 616         xi->starting = true;
 617         xi->server_challenge = 0;
 618 }
 619
 620 static void ceph_x_destroy(struct ceph_auth_client *ac)
 621 {
 622         struct ceph_x_info *xi = ac->private;
 623         struct rb_node *p;
 624
 625         dout("ceph_x_destroy %p\n", ac);
 626         ceph_crypto_key_destroy(&xi->secret);
 627
 628         while ((p = rb_first(&xi->ticket_handlers)) != NULL) {
 629                 struct ceph_x_ticket_handler *th =
 630                         rb_entry(p, struct ceph_x_ticket_handler, node);
 631                 remove_ticket_handler(ac, th);
 632         }
 633
 634         if (xi->auth_authorizer.buf)
 635                 ceph_buffer_put(xi->auth_authorizer.buf);
 636
 637         kfree(ac->private);
 638         ac->private = NULL;
 639 }
 640
 641 static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
 642                                    int peer_type)
 643 {
 644         struct ceph_x_ticket_handler *th;
 645
 646         th = get_ticket_handler(ac, peer_type);
 647         if (!IS_ERR(th))
 648                 remove_ticket_handler(ac, th);
 649 }
 650
 651
 652 static const struct ceph_auth_client_ops ceph_x_ops = {
 653         .name = "x",
 654         .is_authenticated = ceph_x_is_authenticated,
 655         .should_authenticate = ceph_x_should_authenticate,
 656         .build_request = ceph_x_build_request,
 657         .handle_reply = ceph_x_handle_reply,
 658         .create_authorizer = ceph_x_create_authorizer,
 659         .verify_authorizer_reply = ceph_x_verify_authorizer_reply,
 660         .destroy_authorizer = ceph_x_destroy_authorizer,
 661         .invalidate_authorizer = ceph_x_invalidate_authorizer,
 662         .reset =  ceph_x_reset,
 663         .destroy = ceph_x_destroy,
 664 };
 665
 666
 667 int ceph_x_init(struct ceph_auth_client *ac)
 668 {
 669         struct ceph_x_info *xi;
 670         int ret;
 671
 672         dout("ceph_x_init %p\n", ac);
 673         ret = -ENOMEM;
 674         xi = kzalloc(sizeof(*xi), GFP_NOFS);
 675         if (!xi)
 676                 goto out;
 677
 678         ret = -EINVAL;
 679         if (!ac->key) {
 680                 pr_err("no secret set (for auth_x protocol)\n");
 681                 goto out_nomem;
 682         }
 683
 684         ret = ceph_crypto_key_clone(&xi->secret, ac->key);
 685         if (ret < 0) {
 686                 pr_err("cannot clone key: %d\n", ret);
 687                 goto out_nomem;
 688         }
 689
 690         xi->starting = true;
 691         xi->ticket_handlers = RB_ROOT;
 692
 693         ac->protocol = CEPH_AUTH_CEPHX;
 694         ac->private = xi;
 695         ac->ops = &ceph_x_ops;
 696         return 0;
 697
 698 out_nomem:
 699         kfree(xi);
 700 out:
 701         return ret;
 702 }
 703
 704