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