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_should_authenticate(struct ceph_auth_client *ac)
  31 {
  32         struct ceph_x_info *xi = ac->private;
  33         int need;
  34
  35         ceph_x_validate_tickets(ac, &need);
  36         dout("ceph_x_should_authenticate want=%d need=%d have=%d\n",
  37              ac->want_keys, need, xi->have_keys);
  38         return need != 0;
  39 }
  40
  41 static int ceph_x_encrypt_buflen(int ilen)
  42 {
  43         return sizeof(struct ceph_x_encrypt_header) + ilen + 16 +
  44                 sizeof(u32);
  45 }
  46
  47 static int ceph_x_encrypt(struct ceph_crypto_key *secret,
  48                           void *ibuf, int ilen, void *obuf, size_t olen)
  49 {
  50         struct ceph_x_encrypt_header head = {
  51                 .struct_v = 1,
  52                 .magic = cpu_to_le64(CEPHX_ENC_MAGIC)
  53         };
  54         size_t len = olen - sizeof(u32);
  55         int ret;
  56
  57         ret = ceph_encrypt2(secret, obuf + sizeof(u32), &len,
  58                             &head, sizeof(head), ibuf, ilen);
  59         if (ret)
  60                 return ret;
  61         ceph_encode_32(&obuf, len);
  62         return len + sizeof(u32);
  63 }
  64
  65 static int ceph_x_decrypt(struct ceph_crypto_key *secret,
  66                           void **p, void *end, void *obuf, size_t olen)
  67 {
  68         struct ceph_x_encrypt_header head;
  69         size_t head_len = sizeof(head);
  70         int len, ret;
  71
  72         len = ceph_decode_32(p);
  73         if (*p + len > end)
  74                 return -EINVAL;
  75
  76         dout("ceph_x_decrypt len %d\n", len);
  77         ret = ceph_decrypt2(secret, &head, &head_len, obuf, &olen,
  78                             *p, len);
  79         if (ret)
  80                 return ret;
  81         if (head.struct_v != 1 || le64_to_cpu(head.magic) != CEPHX_ENC_MAGIC)
  82                 return -EPERM;
  83         *p += len;
  84         return olen;
  85 }
  86
  87 /*
  88  * get existing (or insert new) ticket handler
  89  */
  90 struct ceph_x_ticket_handler *get_ticket_handler(struct ceph_auth_client *ac,
  91                                                  int service)
  92 {
  93         struct ceph_x_ticket_handler *th;
  94         struct ceph_x_info *xi = ac->private;
  95         struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node;
  96
  97         while (*p) {
  98                 parent = *p;
  99                 th = rb_entry(parent, struct ceph_x_ticket_handler, node);
 100                 if (service < th->service)
 101                         p = &(*p)->rb_left;
 102                 else if (service > th->service)
 103                         p = &(*p)->rb_right;
 104                 else
 105                         return th;
 106         }
 107
 108         /* add it */
 109         th = kzalloc(sizeof(*th), GFP_NOFS);
 110         if (!th)
 111                 return ERR_PTR(-ENOMEM);
 112         th->service = service;
 113         rb_link_node(&th->node, parent, p);
 114         rb_insert_color(&th->node, &xi->ticket_handlers);
 115         return th;
 116 }
 117
 118 static void remove_ticket_handler(struct ceph_auth_client *ac,
 119                                   struct ceph_x_ticket_handler *th)
 120 {
 121         struct ceph_x_info *xi = ac->private;
 122
 123         dout("remove_ticket_handler %p %d\n", th, th->service);
 124         rb_erase(&th->node, &xi->ticket_handlers);
 125         ceph_crypto_key_destroy(&th->session_key);
 126         if (th->ticket_blob)
 127                 ceph_buffer_put(th->ticket_blob);
 128         kfree(th);
 129 }
 130
 131 static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
 132                                     struct ceph_crypto_key *secret,
 133                                     void *buf, void *end)
 134 {
 135         struct ceph_x_info *xi = ac->private;
 136         int num;
 137         void *p = buf;
 138         int ret;
 139         char *dbuf;
 140         char *ticket_buf;
 141         u8 reply_struct_v;
 142
 143         dbuf = kmalloc(TEMP_TICKET_BUF_LEN, GFP_NOFS);
 144         if (!dbuf)
 145                 return -ENOMEM;
 146
 147         ret = -ENOMEM;
 148         ticket_buf = kmalloc(TEMP_TICKET_BUF_LEN, GFP_NOFS);
 149         if (!ticket_buf)
 150                 goto out_dbuf;
 151
 152         ceph_decode_need(&p, end, 1 + sizeof(u32), bad);
 153         reply_struct_v = ceph_decode_8(&p);
 154         if (reply_struct_v != 1)
 155                 goto bad;
 156         num = ceph_decode_32(&p);
 157         dout("%d tickets\n", num);
 158         while (num--) {
 159                 int type;
 160                 u8 tkt_struct_v, blob_struct_v;
 161                 struct ceph_x_ticket_handler *th;
 162                 void *dp, *dend;
 163                 int dlen;
 164                 char is_enc;
 165                 struct timespec validity;
 166                 struct ceph_crypto_key old_key;
 167                 void *tp, *tpend;
 168                 struct ceph_timespec new_validity;
 169                 struct ceph_crypto_key new_session_key;
 170                 struct ceph_buffer *new_ticket_blob;
 171                 unsigned long new_expires, new_renew_after;
 172                 u64 new_secret_id;
 173
 174                 ceph_decode_need(&p, end, sizeof(u32) + 1, bad);
 175
 176                 type = ceph_decode_32(&p);
 177                 dout(" ticket type %d %s\n", type, ceph_entity_type_name(type));
 178
 179                 tkt_struct_v = ceph_decode_8(&p);
 180                 if (tkt_struct_v != 1)
 181                         goto bad;
 182
 183                 th = get_ticket_handler(ac, type);
 184                 if (IS_ERR(th)) {
 185                         ret = PTR_ERR(th);
 186                         goto out;
 187                 }
 188
 189                 /* blob for me */
 190                 dlen = ceph_x_decrypt(secret, &p, end, dbuf,
 191                                       TEMP_TICKET_BUF_LEN);
 192                 if (dlen <= 0) {
 193                         ret = dlen;
 194                         goto out;
 195                 }
 196                 dout(" decrypted %d bytes\n", dlen);
 197                 dend = dbuf + dlen;
 198                 dp = dbuf;
 199
 200                 tkt_struct_v = ceph_decode_8(&dp);
 201                 if (tkt_struct_v != 1)
 202                         goto bad;
 203
 204                 memcpy(&old_key, &th->session_key, sizeof(old_key));
 205                 ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
 206                 if (ret)
 207                         goto out;
 208
 209                 ceph_decode_copy(&dp, &new_validity, sizeof(new_validity));
 210                 ceph_decode_timespec(&validity, &new_validity);
 211                 new_expires = get_seconds() + validity.tv_sec;
 212                 new_renew_after = new_expires - (validity.tv_sec / 4);
 213                 dout(" expires=%lu renew_after=%lu\n", new_expires,
 214                      new_renew_after);
 215
 216                 /* ticket blob for service */
 217                 ceph_decode_8_safe(&p, end, is_enc, bad);
 218                 tp = ticket_buf;
 219                 if (is_enc) {
 220                         /* encrypted */
 221                         dout(" encrypted ticket\n");
 222                         dlen = ceph_x_decrypt(&old_key, &p, end, ticket_buf,
 223                                               TEMP_TICKET_BUF_LEN);
 224                         if (dlen < 0) {
 225                                 ret = dlen;
 226                                 goto out;
 227                         }
 228                         dlen = ceph_decode_32(&tp);
 229                 } else {
 230                         /* unencrypted */
 231                         ceph_decode_32_safe(&p, end, dlen, bad);
 232                         ceph_decode_need(&p, end, dlen, bad);
 233                         ceph_decode_copy(&p, ticket_buf, dlen);
 234                 }
 235                 tpend = tp + dlen;
 236                 dout(" ticket blob is %d bytes\n", dlen);
 237                 ceph_decode_need(&tp, tpend, 1 + sizeof(u64), bad);
 238                 blob_struct_v = ceph_decode_8(&tp);
 239                 new_secret_id = ceph_decode_64(&tp);
 240                 ret = ceph_decode_buffer(&new_ticket_blob, &tp, tpend);
 241                 if (ret)
 242                         goto out;
 243
 244                 /* all is well, update our ticket */
 245                 ceph_crypto_key_destroy(&th->session_key);
 246                 if (th->ticket_blob)
 247                         ceph_buffer_put(th->ticket_blob);
 248                 th->session_key = new_session_key;
 249                 th->ticket_blob = new_ticket_blob;
 250                 th->validity = new_validity;
 251                 th->secret_id = new_secret_id;
 252                 th->expires = new_expires;
 253                 th->renew_after = new_renew_after;
 254                 dout(" got ticket service %d (%s) secret_id %lld len %d\n",
 255                      type, ceph_entity_type_name(type), th->secret_id,
 256                      (int)th->ticket_blob->vec.iov_len);
 257                 xi->have_keys |= th->service;
 258         }
 259
 260         ret = 0;
 261 out:
 262         kfree(ticket_buf);
 263 out_dbuf:
 264         kfree(dbuf);
 265         return ret;
 266
 267 bad:
 268         ret = -EINVAL;
 269         goto out;
 270 }
 271
 272 static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
 273                                    struct ceph_x_ticket_handler *th,
 274                                    struct ceph_x_authorizer *au)
 275 {
 276         int maxlen;
 277         struct ceph_x_authorize_a *msg_a;
 278         struct ceph_x_authorize_b msg_b;
 279         void *p, *end;
 280         int ret;
 281         int ticket_blob_len =
 282                 (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0);
 283
 284         dout("build_authorizer for %s %p\n",
 285              ceph_entity_type_name(th->service), au);
 286
 287         maxlen = sizeof(*msg_a) + sizeof(msg_b) +
 288                 ceph_x_encrypt_buflen(ticket_blob_len);
 289         dout("  need len %d\n", maxlen);
 290         if (au->buf && au->buf->alloc_len < maxlen) {
 291                 ceph_buffer_put(au->buf);
 292                 au->buf = NULL;
 293         }
 294         if (!au->buf) {
 295                 au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
 296                 if (!au->buf)
 297                         return -ENOMEM;
 298         }
 299         au->service = th->service;
 300
 301         msg_a = au->buf->vec.iov_base;
 302         msg_a->struct_v = 1;
 303         msg_a->global_id = cpu_to_le64(ac->global_id);
 304         msg_a->service_id = cpu_to_le32(th->service);
 305         msg_a->ticket_blob.struct_v = 1;
 306         msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
 307         msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
 308         if (ticket_blob_len) {
 309                 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
 310                        th->ticket_blob->vec.iov_len);
 311         }
 312         dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
 313              le64_to_cpu(msg_a->ticket_blob.secret_id));
 314
 315         p = msg_a + 1;
 316         p += ticket_blob_len;
 317         end = au->buf->vec.iov_base + au->buf->vec.iov_len;
 318
 319         get_random_bytes(&au->nonce, sizeof(au->nonce));
 320         msg_b.struct_v = 1;
 321         msg_b.nonce = cpu_to_le64(au->nonce);
 322         ret = ceph_x_encrypt(&th->session_key, &msg_b, sizeof(msg_b),
 323                              p, end - p);
 324         if (ret < 0)
 325                 goto out_buf;
 326         p += ret;
 327         au->buf->vec.iov_len = p - au->buf->vec.iov_base;
 328         dout(" built authorizer nonce %llx len %d\n", au->nonce,
 329              (int)au->buf->vec.iov_len);
 330         BUG_ON(au->buf->vec.iov_len > maxlen);
 331         return 0;
 332
 333 out_buf:
 334         ceph_buffer_put(au->buf);
 335         au->buf = NULL;
 336         return ret;
 337 }
 338
 339 static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
 340                                 void **p, void *end)
 341 {
 342         ceph_decode_need(p, end, 1 + sizeof(u64), bad);
 343         ceph_encode_8(p, 1);
 344         ceph_encode_64(p, th->secret_id);
 345         if (th->ticket_blob) {
 346                 const char *buf = th->ticket_blob->vec.iov_base;
 347                 u32 len = th->ticket_blob->vec.iov_len;
 348
 349                 ceph_encode_32_safe(p, end, len, bad);
 350                 ceph_encode_copy_safe(p, end, buf, len, bad);
 351         } else {
 352                 ceph_encode_32_safe(p, end, 0, bad);
 353         }
 354
 355         return 0;
 356 bad:
 357         return -ERANGE;
 358 }
 359
 360 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
 361 {
 362         int want = ac->want_keys;
 363         struct ceph_x_info *xi = ac->private;
 364         int service;
 365
 366         *pneed = ac->want_keys & ~(xi->have_keys);
 367
 368         for (service = 1; service <= want; service <<= 1) {
 369                 struct ceph_x_ticket_handler *th;
 370
 371                 if (!(ac->want_keys & service))
 372                         continue;
 373
 374                 if (*pneed & service)
 375                         continue;
 376
 377                 th = get_ticket_handler(ac, service);
 378
 379                 if (!th) {
 380                         *pneed |= service;
 381                         continue;
 382                 }
 383
 384                 if (get_seconds() >= th->renew_after)
 385                         *pneed |= service;
 386                 if (get_seconds() >= th->expires)
 387                         xi->have_keys &= ~service;
 388         }
 389 }
 390
 391
 392 static int ceph_x_build_request(struct ceph_auth_client *ac,
 393                                 void *buf, void *end)
 394 {
 395         struct ceph_x_info *xi = ac->private;
 396         int need;
 397         struct ceph_x_request_header *head = buf;
 398         int ret;
 399         struct ceph_x_ticket_handler *th =
 400                 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 401
 402         ceph_x_validate_tickets(ac, &need);
 403
 404         dout("build_request want %x have %x need %x\n",
 405              ac->want_keys, xi->have_keys, need);
 406
 407         if (need & CEPH_ENTITY_TYPE_AUTH) {
 408                 struct ceph_x_authenticate *auth = (void *)(head + 1);
 409                 void *p = auth + 1;
 410                 struct ceph_x_challenge_blob tmp;
 411                 char tmp_enc[40];
 412                 u64 *u;
 413
 414                 if (p > end)
 415                         return -ERANGE;
 416
 417                 dout(" get_auth_session_key\n");
 418                 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
 419
 420                 /* encrypt and hash */
 421                 get_random_bytes(&auth->client_challenge, sizeof(u64));
 422                 tmp.client_challenge = auth->client_challenge;
 423                 tmp.server_challenge = cpu_to_le64(xi->server_challenge);
 424                 ret = ceph_x_encrypt(&xi->secret, &tmp, sizeof(tmp),
 425                                      tmp_enc, sizeof(tmp_enc));
 426                 if (ret < 0)
 427                         return ret;
 428
 429                 auth->struct_v = 1;
 430                 auth->key = 0;
 431                 for (u = (u64 *)tmp_enc; u + 1 <= (u64 *)(tmp_enc + ret); u++)
 432                         auth->key ^= *u;
 433                 dout(" server_challenge %llx client_challenge %llx key %llx\n",
 434                      xi->server_challenge, le64_to_cpu(auth->client_challenge),
 435                      le64_to_cpu(auth->key));
 436
 437                 /* now encode the old ticket if exists */
 438                 ret = ceph_x_encode_ticket(th, &p, end);
 439                 if (ret < 0)
 440                         return ret;
 441
 442                 return p - buf;
 443         }
 444
 445         if (need) {
 446                 void *p = head + 1;
 447                 struct ceph_x_service_ticket_request *req;
 448
 449                 if (p > end)
 450                         return -ERANGE;
 451                 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
 452
 453                 BUG_ON(!th);
 454                 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
 455                 if (ret)
 456                         return ret;
 457                 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
 458                                  xi->auth_authorizer.buf->vec.iov_len);
 459
 460                 req = p;
 461                 req->keys = cpu_to_le32(need);
 462                 p += sizeof(*req);
 463                 return p - buf;
 464         }
 465
 466         return 0;
 467 }
 468
 469 static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
 470                                void *buf, void *end)
 471 {
 472         struct ceph_x_info *xi = ac->private;
 473         struct ceph_x_reply_header *head = buf;
 474         struct ceph_x_ticket_handler *th;
 475         int len = end - buf;
 476         int op;
 477         int ret;
 478
 479         if (result)
 480                 return result;  /* XXX hmm? */
 481
 482         if (xi->starting) {
 483                 /* it's a hello */
 484                 struct ceph_x_server_challenge *sc = buf;
 485
 486                 if (len != sizeof(*sc))
 487                         return -EINVAL;
 488                 xi->server_challenge = le64_to_cpu(sc->server_challenge);
 489                 dout("handle_reply got server challenge %llx\n",
 490                      xi->server_challenge);
 491                 xi->starting = false;
 492                 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
 493                 return -EAGAIN;
 494         }
 495
 496         op = le32_to_cpu(head->op);
 497         result = le32_to_cpu(head->result);
 498         dout("handle_reply op %d result %d\n", op, result);
 499         switch (op) {
 500         case CEPHX_GET_AUTH_SESSION_KEY:
 501                 /* verify auth key */
 502                 ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
 503                                                buf + sizeof(*head), end);
 504                 break;
 505
 506         case CEPHX_GET_PRINCIPAL_SESSION_KEY:
 507                 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 508                 BUG_ON(!th);
 509                 ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
 510                                                buf + sizeof(*head), end);
 511                 break;
 512
 513         default:
 514                 return -EINVAL;
 515         }
 516         if (ret)
 517                 return ret;
 518         if (ac->want_keys == xi->have_keys)
 519                 return 0;
 520         return -EAGAIN;
 521 }
 522
 523 static int ceph_x_create_authorizer(
 524         struct ceph_auth_client *ac, int peer_type,
 525         struct ceph_authorizer **a,
 526         void **buf, size_t *len,
 527         void **reply_buf, size_t *reply_len)
 528 {
 529         struct ceph_x_authorizer *au;
 530         struct ceph_x_ticket_handler *th;
 531         int ret;
 532
 533         th = get_ticket_handler(ac, peer_type);
 534         if (IS_ERR(th))
 535                 return PTR_ERR(th);
 536
 537         au = kzalloc(sizeof(*au), GFP_NOFS);
 538         if (!au)
 539                 return -ENOMEM;
 540
 541         ret = ceph_x_build_authorizer(ac, th, au);
 542         if (ret) {
 543                 kfree(au);
 544                 return ret;
 545         }
 546
 547         *a = (struct ceph_authorizer *)au;
 548         *buf = au->buf->vec.iov_base;
 549         *len = au->buf->vec.iov_len;
 550         *reply_buf = au->reply_buf;
 551         *reply_len = sizeof(au->reply_buf);
 552         return 0;
 553 }
 554
 555 static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
 556                                           struct ceph_authorizer *a, size_t len)
 557 {
 558         struct ceph_x_authorizer *au = (void *)a;
 559         struct ceph_x_ticket_handler *th;
 560         int ret = 0;
 561         struct ceph_x_authorize_reply reply;
 562         void *p = au->reply_buf;
 563         void *end = p + sizeof(au->reply_buf);
 564
 565         th = get_ticket_handler(ac, au->service);
 566         if (!th)
 567                 return -EIO;  /* hrm! */
 568         ret = ceph_x_decrypt(&th->session_key, &p, end, &reply, sizeof(reply));
 569         if (ret < 0)
 570                 return ret;
 571         if (ret != sizeof(reply))
 572                 return -EPERM;
 573
 574         if (au->nonce + 1 != le64_to_cpu(reply.nonce_plus_one))
 575                 ret = -EPERM;
 576         else
 577                 ret = 0;
 578         dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
 579              au->nonce, le64_to_cpu(reply.nonce_plus_one), ret);
 580         return ret;
 581 }
 582
 583 static void ceph_x_destroy_authorizer(struct ceph_auth_client *ac,
 584                                       struct ceph_authorizer *a)
 585 {
 586         struct ceph_x_authorizer *au = (void *)a;
 587
 588         ceph_buffer_put(au->buf);
 589         kfree(au);
 590 }
 591
 592
 593 static void ceph_x_reset(struct ceph_auth_client *ac)
 594 {
 595         struct ceph_x_info *xi = ac->private;
 596
 597         dout("reset\n");
 598         xi->starting = true;
 599         xi->server_challenge = 0;
 600 }
 601
 602 static void ceph_x_destroy(struct ceph_auth_client *ac)
 603 {
 604         struct ceph_x_info *xi = ac->private;
 605         struct rb_node *p;
 606
 607         dout("ceph_x_destroy %p\n", ac);
 608         ceph_crypto_key_destroy(&xi->secret);
 609
 610         while ((p = rb_first(&xi->ticket_handlers)) != NULL) {
 611                 struct ceph_x_ticket_handler *th =
 612                         rb_entry(p, struct ceph_x_ticket_handler, node);
 613                 remove_ticket_handler(ac, th);
 614         }
 615
 616         kfree(ac->private);
 617         ac->private = NULL;
 618 }
 619
 620 static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
 621                                    int peer_type)
 622 {
 623         struct ceph_x_ticket_handler *th;
 624
 625         th = get_ticket_handler(ac, peer_type);
 626         if (th && !IS_ERR(th))
 627                 remove_ticket_handler(ac, th);
 628 }
 629
 630
 631 static const struct ceph_auth_client_ops ceph_x_ops = {
 632         .name = "x",
 633         .is_authenticated = ceph_x_is_authenticated,
 634         .should_authenticate = ceph_x_should_authenticate,
 635         .build_request = ceph_x_build_request,
 636         .handle_reply = ceph_x_handle_reply,
 637         .create_authorizer = ceph_x_create_authorizer,
 638         .verify_authorizer_reply = ceph_x_verify_authorizer_reply,
 639         .destroy_authorizer = ceph_x_destroy_authorizer,
 640         .invalidate_authorizer = ceph_x_invalidate_authorizer,
 641         .reset =  ceph_x_reset,
 642         .destroy = ceph_x_destroy,
 643 };
 644
 645
 646 int ceph_x_init(struct ceph_auth_client *ac)
 647 {
 648         struct ceph_x_info *xi;
 649         int ret;
 650
 651         dout("ceph_x_init %p\n", ac);
 652         ret = -ENOMEM;
 653         xi = kzalloc(sizeof(*xi), GFP_NOFS);
 654         if (!xi)
 655                 goto out;
 656
 657         ret = -EINVAL;
 658         if (!ac->secret) {
 659                 pr_err("no secret set (for auth_x protocol)\n");
 660                 goto out_nomem;
 661         }
 662
 663         ret = ceph_crypto_key_unarmor(&xi->secret, ac->secret);
 664         if (ret)
 665                 goto out_nomem;
 666
 667         xi->starting = true;
 668         xi->ticket_handlers = RB_ROOT;
 669
 670         ac->protocol = CEPH_AUTH_CEPHX;
 671         ac->private = xi;
 672         ac->ops = &ceph_x_ops;
 673         return 0;
 674
 675 out_nomem:
 676         kfree(xi);
 677 out:
 678         return ret;
 679 }
 680
 681