fs/ceph/auth_x.c

   1
   2 #include "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 "auth_x.h"
  10 #include "auth_x_protocol.h"
  11 #include "crypto.h"
  12 #include "auth.h"
  13 #include "decode.h"
  14
  15 #define TEMP_TICKET_BUF_LEN     256
  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_encrypt_buflen(int ilen)
  31 {
  32         return sizeof(struct ceph_x_encrypt_header) + ilen + 16 +
  33                 sizeof(u32);
  34 }
  35
  36 static int ceph_x_encrypt(struct ceph_crypto_key *secret,
  37                           void *ibuf, int ilen, void *obuf, size_t olen)
  38 {
  39         struct ceph_x_encrypt_header head = {
  40                 .struct_v = 1,
  41                 .magic = cpu_to_le64(CEPHX_ENC_MAGIC)
  42         };
  43         size_t len = olen - sizeof(u32);
  44         int ret;
  45
  46         ret = ceph_encrypt2(secret, obuf + sizeof(u32), &len,
  47                             &head, sizeof(head), ibuf, ilen);
  48         if (ret)
  49                 return ret;
  50         ceph_encode_32(&obuf, len);
  51         return len + sizeof(u32);
  52 }
  53
  54 static int ceph_x_decrypt(struct ceph_crypto_key *secret,
  55                           void **p, void *end, void *obuf, size_t olen)
  56 {
  57         struct ceph_x_encrypt_header head;
  58         size_t head_len = sizeof(head);
  59         int len, ret;
  60
  61         len = ceph_decode_32(p);
  62         if (*p + len > end)
  63                 return -EINVAL;
  64
  65         dout("ceph_x_decrypt len %d\n", len);
  66         ret = ceph_decrypt2(secret, &head, &head_len, obuf, &olen,
  67                             *p, len);
  68         if (ret)
  69                 return ret;
  70         if (head.struct_v != 1 || le64_to_cpu(head.magic) != CEPHX_ENC_MAGIC)
  71                 return -EPERM;
  72         *p += len;
  73         return olen;
  74 }
  75
  76 /*
  77  * get existing (or insert new) ticket handler
  78  */
  79 struct ceph_x_ticket_handler *get_ticket_handler(struct ceph_auth_client *ac,
  80                                                  int service)
  81 {
  82         struct ceph_x_ticket_handler *th;
  83         struct ceph_x_info *xi = ac->private;
  84         struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node;
  85
  86         while (*p) {
  87                 parent = *p;
  88                 th = rb_entry(parent, struct ceph_x_ticket_handler, node);
  89                 if (service < th->service)
  90                         p = &(*p)->rb_left;
  91                 else if (service > th->service)
  92                         p = &(*p)->rb_right;
  93                 else
  94                         return th;
  95         }
  96
  97         /* add it */
  98         th = kzalloc(sizeof(*th), GFP_NOFS);
  99         if (!th)
 100                 return ERR_PTR(-ENOMEM);
 101         th->service = service;
 102         rb_link_node(&th->node, parent, p);
 103         rb_insert_color(&th->node, &xi->ticket_handlers);
 104         return th;
 105 }
 106
 107 static void remove_ticket_handler(struct ceph_auth_client *ac,
 108                                   struct ceph_x_ticket_handler *th)
 109 {
 110         struct ceph_x_info *xi = ac->private;
 111
 112         dout("remove_ticket_handler %p %d\n", th, th->service);
 113         rb_erase(&th->node, &xi->ticket_handlers);
 114         ceph_crypto_key_destroy(&th->session_key);
 115         if (th->ticket_blob)
 116                 ceph_buffer_put(th->ticket_blob);
 117         kfree(th);
 118 }
 119
 120 static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
 121                                     struct ceph_crypto_key *secret,
 122                                     void *buf, void *end)
 123 {
 124         struct ceph_x_info *xi = ac->private;
 125         int num;
 126         void *p = buf;
 127         int ret;
 128         char *dbuf;
 129         char *ticket_buf;
 130         u8 struct_v;
 131
 132         dbuf = kmalloc(TEMP_TICKET_BUF_LEN, GFP_NOFS);
 133         if (!dbuf)
 134                 return -ENOMEM;
 135
 136         ret = -ENOMEM;
 137         ticket_buf = kmalloc(TEMP_TICKET_BUF_LEN, GFP_NOFS);
 138         if (!ticket_buf)
 139                 goto out_dbuf;
 140
 141         ceph_decode_need(&p, end, 1 + sizeof(u32), bad);
 142         struct_v = ceph_decode_8(&p);
 143         if (struct_v != 1)
 144                 goto bad;
 145         num = ceph_decode_32(&p);
 146         dout("%d tickets\n", num);
 147         while (num--) {
 148                 int type;
 149                 u8 struct_v;
 150                 struct ceph_x_ticket_handler *th;
 151                 void *dp, *dend;
 152                 int dlen;
 153                 char is_enc;
 154                 struct timespec validity;
 155                 struct ceph_crypto_key old_key;
 156                 void *tp, *tpend;
 157                 struct ceph_timespec new_validity;
 158                 struct ceph_crypto_key new_session_key;
 159                 struct ceph_buffer *new_ticket_blob;
 160                 unsigned long new_expires, new_renew_after;
 161                 u64 new_secret_id;
 162
 163                 ceph_decode_need(&p, end, sizeof(u32) + 1, bad);
 164
 165                 type = ceph_decode_32(&p);
 166                 dout(" ticket type %d %s\n", type, ceph_entity_type_name(type));
 167
 168                 struct_v = ceph_decode_8(&p);
 169                 if (struct_v != 1)
 170                         goto bad;
 171
 172                 th = get_ticket_handler(ac, type);
 173                 if (IS_ERR(th)) {
 174                         ret = PTR_ERR(th);
 175                         goto out;
 176                 }
 177
 178                 /* blob for me */
 179                 dlen = ceph_x_decrypt(secret, &p, end, dbuf,
 180                                       TEMP_TICKET_BUF_LEN);
 181                 if (dlen <= 0) {
 182                         ret = dlen;
 183                         goto out;
 184                 }
 185                 dout(" decrypted %d bytes\n", dlen);
 186                 dend = dbuf + dlen;
 187                 dp = dbuf;
 188
 189                 struct_v = ceph_decode_8(&dp);
 190                 if (struct_v != 1)
 191                         goto bad;
 192
 193                 memcpy(&old_key, &th->session_key, sizeof(old_key));
 194                 ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
 195                 if (ret)
 196                         goto out;
 197
 198                 ceph_decode_copy(&dp, &new_validity, sizeof(new_validity));
 199                 ceph_decode_timespec(&validity, &new_validity);
 200                 new_expires = get_seconds() + validity.tv_sec;
 201                 new_renew_after = new_expires - (validity.tv_sec / 4);
 202                 dout(" expires=%lu renew_after=%lu\n", new_expires,
 203                      new_renew_after);
 204
 205                 /* ticket blob for service */
 206                 ceph_decode_8_safe(&p, end, is_enc, bad);
 207                 tp = ticket_buf;
 208                 if (is_enc) {
 209                         /* encrypted */
 210                         dout(" encrypted ticket\n");
 211                         dlen = ceph_x_decrypt(&old_key, &p, end, ticket_buf,
 212                                               TEMP_TICKET_BUF_LEN);
 213                         if (dlen < 0) {
 214                                 ret = dlen;
 215                                 goto out;
 216                         }
 217                         dlen = ceph_decode_32(&tp);
 218                 } else {
 219                         /* unencrypted */
 220                         ceph_decode_32_safe(&p, end, dlen, bad);
 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                 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
 249         ret = 0;
 250 out:
 251         kfree(ticket_buf);
 252 out_dbuf:
 253         kfree(dbuf);
 254         return ret;
 255
 256 bad:
 257         ret = -EINVAL;
 258         goto out;
 259 }
 260
 261 static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
 262                                    struct ceph_x_ticket_handler *th,
 263                                    struct ceph_x_authorizer *au)
 264 {
 265         int maxlen;
 266         struct ceph_x_authorize_a *msg_a;
 267         struct ceph_x_authorize_b msg_b;
 268         void *p, *end;
 269         int ret;
 270         int ticket_blob_len =
 271                 (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0);
 272
 273         dout("build_authorizer for %s %p\n",
 274              ceph_entity_type_name(th->service), au);
 275
 276         maxlen = sizeof(*msg_a) + sizeof(msg_b) +
 277                 ceph_x_encrypt_buflen(ticket_blob_len);
 278         dout("  need len %d\n", maxlen);
 279         if (au->buf && au->buf->alloc_len < maxlen) {
 280                 ceph_buffer_put(au->buf);
 281                 au->buf = NULL;
 282         }
 283         if (!au->buf) {
 284                 au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
 285                 if (!au->buf)
 286                         return -ENOMEM;
 287         }
 288         au->service = th->service;
 289
 290         msg_a = au->buf->vec.iov_base;
 291         msg_a->struct_v = 1;
 292         msg_a->global_id = cpu_to_le64(ac->global_id);
 293         msg_a->service_id = cpu_to_le32(th->service);
 294         msg_a->ticket_blob.struct_v = 1;
 295         msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
 296         msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
 297         if (ticket_blob_len) {
 298                 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
 299                        th->ticket_blob->vec.iov_len);
 300         }
 301         dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
 302              le64_to_cpu(msg_a->ticket_blob.secret_id));
 303
 304         p = msg_a + 1;
 305         p += ticket_blob_len;
 306         end = au->buf->vec.iov_base + au->buf->vec.iov_len;
 307
 308         get_random_bytes(&au->nonce, sizeof(au->nonce));
 309         msg_b.struct_v = 1;
 310         msg_b.nonce = cpu_to_le64(au->nonce);
 311         ret = ceph_x_encrypt(&th->session_key, &msg_b, sizeof(msg_b),
 312                              p, end - p);
 313         if (ret < 0)
 314                 goto out_buf;
 315         p += ret;
 316         au->buf->vec.iov_len = p - au->buf->vec.iov_base;
 317         dout(" built authorizer nonce %llx len %d\n", au->nonce,
 318              (int)au->buf->vec.iov_len);
 319         BUG_ON(au->buf->vec.iov_len > maxlen);
 320         return 0;
 321
 322 out_buf:
 323         ceph_buffer_put(au->buf);
 324         au->buf = NULL;
 325         return ret;
 326 }
 327
 328 static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
 329                                 void **p, void *end)
 330 {
 331         ceph_decode_need(p, end, 1 + sizeof(u64), bad);
 332         ceph_encode_8(p, 1);
 333         ceph_encode_64(p, th->secret_id);
 334         if (th->ticket_blob) {
 335                 const char *buf = th->ticket_blob->vec.iov_base;
 336                 u32 len = th->ticket_blob->vec.iov_len;
 337
 338                 ceph_encode_32_safe(p, end, len, bad);
 339                 ceph_encode_copy_safe(p, end, buf, len, bad);
 340         } else {
 341                 ceph_encode_32_safe(p, end, 0, bad);
 342         }
 343
 344         return 0;
 345 bad:
 346         return -ERANGE;
 347 }
 348
 349 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
 350 {
 351         int want = ac->want_keys;
 352         struct ceph_x_info *xi = ac->private;
 353         int service;
 354
 355         *pneed = ac->want_keys & ~(xi->have_keys);
 356
 357         for (service = 1; service <= want; service <<= 1) {
 358                 struct ceph_x_ticket_handler *th;
 359
 360                 if (!(ac->want_keys & service))
 361                         continue;
 362
 363                 if (*pneed & service)
 364                         continue;
 365
 366                 th = get_ticket_handler(ac, service);
 367
 368                 if (!th) {
 369                         *pneed |= service;
 370                         continue;
 371                 }
 372
 373                 if (get_seconds() >= th->renew_after)
 374                         *pneed |= service;
 375                 if (get_seconds() >= th->expires)
 376                         xi->have_keys &= ~service;
 377         }
 378 }
 379
 380
 381 static int ceph_x_build_request(struct ceph_auth_client *ac,
 382                                 void *buf, void *end)
 383 {
 384         struct ceph_x_info *xi = ac->private;
 385         int need;
 386         struct ceph_x_request_header *head = buf;
 387         int ret;
 388         struct ceph_x_ticket_handler *th =
 389                 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 390
 391         ceph_x_validate_tickets(ac, &need);
 392
 393         dout("build_request want %x have %x need %x\n",
 394              ac->want_keys, xi->have_keys, need);
 395
 396         if (need & CEPH_ENTITY_TYPE_AUTH) {
 397                 struct ceph_x_authenticate *auth = (void *)(head + 1);
 398                 void *p = auth + 1;
 399                 struct ceph_x_challenge_blob tmp;
 400                 char tmp_enc[40];
 401                 u64 *u;
 402
 403                 if (p > end)
 404                         return -ERANGE;
 405
 406                 dout(" get_auth_session_key\n");
 407                 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
 408
 409                 /* encrypt and hash */
 410                 get_random_bytes(&auth->client_challenge, sizeof(u64));
 411                 tmp.client_challenge = auth->client_challenge;
 412                 tmp.server_challenge = cpu_to_le64(xi->server_challenge);
 413                 ret = ceph_x_encrypt(&xi->secret, &tmp, sizeof(tmp),
 414                                      tmp_enc, sizeof(tmp_enc));
 415                 if (ret < 0)
 416                         return ret;
 417
 418                 auth->struct_v = 1;
 419                 auth->key = 0;
 420                 for (u = (u64 *)tmp_enc; u + 1 <= (u64 *)(tmp_enc + ret); u++)
 421                         auth->key ^= *u;
 422                 dout(" server_challenge %llx client_challenge %llx key %llx\n",
 423                      xi->server_challenge, le64_to_cpu(auth->client_challenge),
 424                      le64_to_cpu(auth->key));
 425
 426                 /* now encode the old ticket if exists */
 427                 ret = ceph_x_encode_ticket(th, &p, end);
 428                 if (ret < 0)
 429                         return ret;
 430
 431                 return p - buf;
 432         }
 433
 434         if (need) {
 435                 void *p = head + 1;
 436                 struct ceph_x_service_ticket_request *req;
 437
 438                 if (p > end)
 439                         return -ERANGE;
 440                 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
 441
 442                 BUG_ON(!th);
 443                 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
 444                 if (ret)
 445                         return ret;
 446                 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
 447                                  xi->auth_authorizer.buf->vec.iov_len);
 448
 449                 req = p;
 450                 req->keys = cpu_to_le32(need);
 451                 p += sizeof(*req);
 452                 return p - buf;
 453         }
 454
 455         return 0;
 456 }
 457
 458 static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
 459                                void *buf, void *end)
 460 {
 461         struct ceph_x_info *xi = ac->private;
 462         struct ceph_x_reply_header *head = buf;
 463         struct ceph_x_ticket_handler *th;
 464         int len = end - buf;
 465         int op;
 466         int ret;
 467
 468         if (result)
 469                 return result;  /* XXX hmm? */
 470
 471         if (xi->starting) {
 472                 /* it's a hello */
 473                 struct ceph_x_server_challenge *sc = buf;
 474
 475                 if (len != sizeof(*sc))
 476                         return -EINVAL;
 477                 xi->server_challenge = le64_to_cpu(sc->server_challenge);
 478                 dout("handle_reply got server challenge %llx\n",
 479                      xi->server_challenge);
 480                 xi->starting = false;
 481                 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
 482                 return -EAGAIN;
 483         }
 484
 485         op = le32_to_cpu(head->op);
 486         result = le32_to_cpu(head->result);
 487         dout("handle_reply op %d result %d\n", op, result);
 488         switch (op) {
 489         case CEPHX_GET_AUTH_SESSION_KEY:
 490                 /* verify auth key */
 491                 ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
 492                                                buf + sizeof(*head), end);
 493                 break;
 494
 495         case CEPHX_GET_PRINCIPAL_SESSION_KEY:
 496                 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 497                 BUG_ON(!th);
 498                 ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
 499                                                buf + sizeof(*head), end);
 500                 break;
 501
 502         default:
 503                 return -EINVAL;
 504         }
 505         if (ret)
 506                 return ret;
 507         if (ac->want_keys == xi->have_keys)
 508                 return 0;
 509         return -EAGAIN;
 510 }
 511
 512 static int ceph_x_create_authorizer(
 513         struct ceph_auth_client *ac, int peer_type,
 514         struct ceph_authorizer **a,
 515         void **buf, size_t *len,
 516         void **reply_buf, size_t *reply_len)
 517 {
 518         struct ceph_x_authorizer *au;
 519         struct ceph_x_ticket_handler *th;
 520         int ret;
 521
 522         th = get_ticket_handler(ac, peer_type);
 523         if (IS_ERR(th))
 524                 return PTR_ERR(th);
 525
 526         au = kzalloc(sizeof(*au), GFP_NOFS);
 527         if (!au)
 528                 return -ENOMEM;
 529
 530         ret = ceph_x_build_authorizer(ac, th, au);
 531         if (ret) {
 532                 kfree(au);
 533                 return ret;
 534         }
 535
 536         *a = (struct ceph_authorizer *)au;
 537         *buf = au->buf->vec.iov_base;
 538         *len = au->buf->vec.iov_len;
 539         *reply_buf = au->reply_buf;
 540         *reply_len = sizeof(au->reply_buf);
 541         return 0;
 542 }
 543
 544 static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
 545                                           struct ceph_authorizer *a, size_t len)
 546 {
 547         struct ceph_x_authorizer *au = (void *)a;
 548         struct ceph_x_ticket_handler *th;
 549         int ret = 0;
 550         struct ceph_x_authorize_reply reply;
 551         void *p = au->reply_buf;
 552         void *end = p + sizeof(au->reply_buf);
 553
 554         th = get_ticket_handler(ac, au->service);
 555         if (!th)
 556                 return -EIO;  /* hrm! */
 557         ret = ceph_x_decrypt(&th->session_key, &p, end, &reply, sizeof(reply));
 558         if (ret < 0)
 559                 return ret;
 560         if (ret != sizeof(reply))
 561                 return -EPERM;
 562
 563         if (au->nonce + 1 != le64_to_cpu(reply.nonce_plus_one))
 564                 ret = -EPERM;
 565         else
 566                 ret = 0;
 567         dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
 568              au->nonce, le64_to_cpu(reply.nonce_plus_one), ret);
 569         return ret;
 570 }
 571
 572 static void ceph_x_destroy_authorizer(struct ceph_auth_client *ac,
 573                                       struct ceph_authorizer *a)
 574 {
 575         struct ceph_x_authorizer *au = (void *)a;
 576
 577         ceph_buffer_put(au->buf);
 578         kfree(au);
 579 }
 580
 581
 582 static void ceph_x_reset(struct ceph_auth_client *ac)
 583 {
 584         struct ceph_x_info *xi = ac->private;
 585
 586         dout("reset\n");
 587         xi->starting = true;
 588         xi->server_challenge = 0;
 589 }
 590
 591 static void ceph_x_destroy(struct ceph_auth_client *ac)
 592 {
 593         struct ceph_x_info *xi = ac->private;
 594         struct rb_node *p;
 595
 596         dout("ceph_x_destroy %p\n", ac);
 597         ceph_crypto_key_destroy(&xi->secret);
 598
 599         while ((p = rb_first(&xi->ticket_handlers)) != NULL) {
 600                 struct ceph_x_ticket_handler *th =
 601                         rb_entry(p, struct ceph_x_ticket_handler, node);
 602                 remove_ticket_handler(ac, th);
 603         }
 604
 605         kfree(ac->private);
 606         ac->private = NULL;
 607 }
 608
 609 static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
 610                                    int peer_type)
 611 {
 612         struct ceph_x_ticket_handler *th;
 613
 614         th = get_ticket_handler(ac, peer_type);
 615         if (th && !IS_ERR(th))
 616                 remove_ticket_handler(ac, th);
 617 }
 618
 619
 620 static const struct ceph_auth_client_ops ceph_x_ops = {
 621         .is_authenticated = ceph_x_is_authenticated,
 622         .build_request = ceph_x_build_request,
 623         .handle_reply = ceph_x_handle_reply,
 624         .create_authorizer = ceph_x_create_authorizer,
 625         .verify_authorizer_reply = ceph_x_verify_authorizer_reply,
 626         .destroy_authorizer = ceph_x_destroy_authorizer,
 627         .invalidate_authorizer = ceph_x_invalidate_authorizer,
 628         .reset =  ceph_x_reset,
 629         .destroy = ceph_x_destroy,
 630 };
 631
 632
 633 int ceph_x_init(struct ceph_auth_client *ac)
 634 {
 635         struct ceph_x_info *xi;
 636         int ret;
 637
 638         dout("ceph_x_init %p\n", ac);
 639         ret = -ENOMEM;
 640         xi = kzalloc(sizeof(*xi), GFP_NOFS);
 641         if (!xi)
 642                 goto out;
 643
 644         ret = -EINVAL;
 645         if (!ac->secret) {
 646                 pr_err("no secret set (for auth_x protocol)\n");
 647                 goto out_nomem;
 648         }
 649
 650         ret = ceph_crypto_key_unarmor(&xi->secret, ac->secret);
 651         if (ret)
 652                 goto out_nomem;
 653
 654         xi->starting = true;
 655         xi->ticket_handlers = RB_ROOT;
 656
 657         ac->protocol = CEPH_AUTH_CEPHX;
 658         ac->private = xi;
 659         ac->ops = &ceph_x_ops;
 660         return 0;
 661
 662 out_nomem:
 663         kfree(xi);
 664 out:
 665         return ret;
 666 }
 667
 668