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 #include <linux/ceph/libceph.h>
  12 #include <linux/ceph/messenger.h>
  13
  14 #include "crypto.h"
  15 #include "auth_x.h"
  16 #include "auth_x_protocol.h"
  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_offset(void)
  43 {
  44         return sizeof(u32) + sizeof(struct ceph_x_encrypt_header);
  45 }
  46
  47 static int ceph_x_encrypt_buflen(int ilen)
  48 {
  49         return ceph_x_encrypt_offset() + ilen + 16;
  50 }
  51
  52 static int ceph_x_encrypt(struct ceph_crypto_key *secret, void *buf,
  53                           int buf_len, int plaintext_len)
  54 {
  55         struct ceph_x_encrypt_header *hdr = buf + sizeof(u32);
  56         int ciphertext_len;
  57         int ret;
  58
  59         hdr->struct_v = 1;
  60         hdr->magic = cpu_to_le64(CEPHX_ENC_MAGIC);
  61
  62         ret = ceph_crypt(secret, true, buf + sizeof(u32), buf_len - sizeof(u32),
  63                          plaintext_len + sizeof(struct ceph_x_encrypt_header),
  64                          &ciphertext_len);
  65         if (ret)
  66                 return ret;
  67
  68         ceph_encode_32(&buf, ciphertext_len);
  69         return sizeof(u32) + ciphertext_len;
  70 }
  71
  72 static int ceph_x_decrypt(struct ceph_crypto_key *secret, void **p, void *end)
  73 {
  74         struct ceph_x_encrypt_header *hdr = *p + sizeof(u32);
  75         int ciphertext_len, plaintext_len;
  76         int ret;
  77
  78         ceph_decode_32_safe(p, end, ciphertext_len, e_inval);
  79         ceph_decode_need(p, end, ciphertext_len, e_inval);
  80
  81         ret = ceph_crypt(secret, false, *p, end - *p, ciphertext_len,
  82                          &plaintext_len);
  83         if (ret)
  84                 return ret;
  85
  86         if (hdr->struct_v != 1 || le64_to_cpu(hdr->magic) != CEPHX_ENC_MAGIC)
  87                 return -EPERM;
  88
  89         *p += ciphertext_len;
  90         return plaintext_len - sizeof(struct ceph_x_encrypt_header);
  91
  92 e_inval:
  93         return -EINVAL;
  94 }
  95
  96 /*
  97  * get existing (or insert new) ticket handler
  98  */
  99 static struct ceph_x_ticket_handler *
 100 get_ticket_handler(struct ceph_auth_client *ac, int service)
 101 {
 102         struct ceph_x_ticket_handler *th;
 103         struct ceph_x_info *xi = ac->private;
 104         struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node;
 105
 106         while (*p) {
 107                 parent = *p;
 108                 th = rb_entry(parent, struct ceph_x_ticket_handler, node);
 109                 if (service < th->service)
 110                         p = &(*p)->rb_left;
 111                 else if (service > th->service)
 112                         p = &(*p)->rb_right;
 113                 else
 114                         return th;
 115         }
 116
 117         /* add it */
 118         th = kzalloc(sizeof(*th), GFP_NOFS);
 119         if (!th)
 120                 return ERR_PTR(-ENOMEM);
 121         th->service = service;
 122         rb_link_node(&th->node, parent, p);
 123         rb_insert_color(&th->node, &xi->ticket_handlers);
 124         return th;
 125 }
 126
 127 static void remove_ticket_handler(struct ceph_auth_client *ac,
 128                                   struct ceph_x_ticket_handler *th)
 129 {
 130         struct ceph_x_info *xi = ac->private;
 131
 132         dout("remove_ticket_handler %p %d\n", th, th->service);
 133         rb_erase(&th->node, &xi->ticket_handlers);
 134         ceph_crypto_key_destroy(&th->session_key);
 135         if (th->ticket_blob)
 136                 ceph_buffer_put(th->ticket_blob);
 137         kfree(th);
 138 }
 139
 140 static int process_one_ticket(struct ceph_auth_client *ac,
 141                               struct ceph_crypto_key *secret,
 142                               void **p, void *end)
 143 {
 144         struct ceph_x_info *xi = ac->private;
 145         int type;
 146         u8 tkt_struct_v, blob_struct_v;
 147         struct ceph_x_ticket_handler *th;
 148         void *dp, *dend;
 149         int dlen;
 150         char is_enc;
 151         struct timespec validity;
 152         void *tp, *tpend;
 153         void **ptp;
 154         struct ceph_crypto_key new_session_key = { 0 };
 155         struct ceph_buffer *new_ticket_blob;
 156         unsigned long new_expires, new_renew_after;
 157         u64 new_secret_id;
 158         int ret;
 159
 160         ceph_decode_need(p, end, sizeof(u32) + 1, bad);
 161
 162         type = ceph_decode_32(p);
 163         dout(" ticket type %d %s\n", type, ceph_entity_type_name(type));
 164
 165         tkt_struct_v = ceph_decode_8(p);
 166         if (tkt_struct_v != 1)
 167                 goto bad;
 168
 169         th = get_ticket_handler(ac, type);
 170         if (IS_ERR(th)) {
 171                 ret = PTR_ERR(th);
 172                 goto out;
 173         }
 174
 175         /* blob for me */
 176         dp = *p + ceph_x_encrypt_offset();
 177         ret = ceph_x_decrypt(secret, p, end);
 178         if (ret < 0)
 179                 goto out;
 180         dout(" decrypted %d bytes\n", ret);
 181         dend = dp + ret;
 182
 183         tkt_struct_v = ceph_decode_8(&dp);
 184         if (tkt_struct_v != 1)
 185                 goto bad;
 186
 187         ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
 188         if (ret)
 189                 goto out;
 190
 191         ceph_decode_timespec(&validity, dp);
 192         dp += sizeof(struct ceph_timespec);
 193         new_expires = get_seconds() + validity.tv_sec;
 194         new_renew_after = new_expires - (validity.tv_sec / 4);
 195         dout(" expires=%lu renew_after=%lu\n", new_expires,
 196              new_renew_after);
 197
 198         /* ticket blob for service */
 199         ceph_decode_8_safe(p, end, is_enc, bad);
 200         if (is_enc) {
 201                 /* encrypted */
 202                 tp = *p + ceph_x_encrypt_offset();
 203                 ret = ceph_x_decrypt(&th->session_key, p, end);
 204                 if (ret < 0)
 205                         goto out;
 206                 dout(" encrypted ticket, decrypted %d bytes\n", ret);
 207                 ptp = &tp;
 208                 tpend = tp + ret;
 209         } else {
 210                 /* unencrypted */
 211                 ptp = p;
 212                 tpend = end;
 213         }
 214         ceph_decode_32_safe(ptp, tpend, dlen, bad);
 215         dout(" ticket blob is %d bytes\n", dlen);
 216         ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad);
 217         blob_struct_v = ceph_decode_8(ptp);
 218         if (blob_struct_v != 1)
 219                 goto bad;
 220
 221         new_secret_id = ceph_decode_64(ptp);
 222         ret = ceph_decode_buffer(&new_ticket_blob, ptp, tpend);
 223         if (ret)
 224                 goto out;
 225
 226         /* all is well, update our ticket */
 227         ceph_crypto_key_destroy(&th->session_key);
 228         if (th->ticket_blob)
 229                 ceph_buffer_put(th->ticket_blob);
 230         th->session_key = new_session_key;
 231         th->ticket_blob = new_ticket_blob;
 232         th->secret_id = new_secret_id;
 233         th->expires = new_expires;
 234         th->renew_after = new_renew_after;
 235         th->have_key = true;
 236         dout(" got ticket service %d (%s) secret_id %lld len %d\n",
 237              type, ceph_entity_type_name(type), th->secret_id,
 238              (int)th->ticket_blob->vec.iov_len);
 239         xi->have_keys |= th->service;
 240         return 0;
 241
 242 bad:
 243         ret = -EINVAL;
 244 out:
 245         ceph_crypto_key_destroy(&new_session_key);
 246         return ret;
 247 }
 248
 249 static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
 250                                     struct ceph_crypto_key *secret,
 251                                     void *buf, void *end)
 252 {
 253         void *p = buf;
 254         u8 reply_struct_v;
 255         u32 num;
 256         int ret;
 257
 258         ceph_decode_8_safe(&p, end, reply_struct_v, bad);
 259         if (reply_struct_v != 1)
 260                 return -EINVAL;
 261
 262         ceph_decode_32_safe(&p, end, num, bad);
 263         dout("%d tickets\n", num);
 264
 265         while (num--) {
 266                 ret = process_one_ticket(ac, secret, &p, end);
 267                 if (ret)
 268                         return ret;
 269         }
 270
 271         return 0;
 272
 273 bad:
 274         return -EINVAL;
 275 }
 276
 277 static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au)
 278 {
 279         ceph_crypto_key_destroy(&au->session_key);
 280         if (au->buf) {
 281                 ceph_buffer_put(au->buf);
 282                 au->buf = NULL;
 283         }
 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         ceph_crypto_key_destroy(&au->session_key);
 302         ret = ceph_crypto_key_clone(&au->session_key, &th->session_key);
 303         if (ret)
 304                 goto out_au;
 305
 306         maxlen = sizeof(*msg_a) + ticket_blob_len +
 307                 ceph_x_encrypt_buflen(sizeof(*msg_b));
 308         dout("  need len %d\n", maxlen);
 309         if (au->buf && au->buf->alloc_len < maxlen) {
 310                 ceph_buffer_put(au->buf);
 311                 au->buf = NULL;
 312         }
 313         if (!au->buf) {
 314                 au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
 315                 if (!au->buf) {
 316                         ret = -ENOMEM;
 317                         goto out_au;
 318                 }
 319         }
 320         au->service = th->service;
 321         au->secret_id = th->secret_id;
 322
 323         msg_a = au->buf->vec.iov_base;
 324         msg_a->struct_v = 1;
 325         msg_a->global_id = cpu_to_le64(ac->global_id);
 326         msg_a->service_id = cpu_to_le32(th->service);
 327         msg_a->ticket_blob.struct_v = 1;
 328         msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
 329         msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
 330         if (ticket_blob_len) {
 331                 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
 332                        th->ticket_blob->vec.iov_len);
 333         }
 334         dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
 335              le64_to_cpu(msg_a->ticket_blob.secret_id));
 336
 337         p = msg_a + 1;
 338         p += ticket_blob_len;
 339         end = au->buf->vec.iov_base + au->buf->vec.iov_len;
 340
 341         msg_b = p + ceph_x_encrypt_offset();
 342         msg_b->struct_v = 1;
 343         get_random_bytes(&au->nonce, sizeof(au->nonce));
 344         msg_b->nonce = cpu_to_le64(au->nonce);
 345         ret = ceph_x_encrypt(&au->session_key, p, end - p, sizeof(*msg_b));
 346         if (ret < 0)
 347                 goto out_au;
 348
 349         p += ret;
 350         WARN_ON(p > end);
 351         au->buf->vec.iov_len = p - au->buf->vec.iov_base;
 352         dout(" built authorizer nonce %llx len %d\n", au->nonce,
 353              (int)au->buf->vec.iov_len);
 354         return 0;
 355
 356 out_au:
 357         ceph_x_authorizer_cleanup(au);
 358         return ret;
 359 }
 360
 361 static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
 362                                 void **p, void *end)
 363 {
 364         ceph_decode_need(p, end, 1 + sizeof(u64), bad);
 365         ceph_encode_8(p, 1);
 366         ceph_encode_64(p, th->secret_id);
 367         if (th->ticket_blob) {
 368                 const char *buf = th->ticket_blob->vec.iov_base;
 369                 u32 len = th->ticket_blob->vec.iov_len;
 370
 371                 ceph_encode_32_safe(p, end, len, bad);
 372                 ceph_encode_copy_safe(p, end, buf, len, bad);
 373         } else {
 374                 ceph_encode_32_safe(p, end, 0, bad);
 375         }
 376
 377         return 0;
 378 bad:
 379         return -ERANGE;
 380 }
 381
 382 static bool need_key(struct ceph_x_ticket_handler *th)
 383 {
 384         if (!th->have_key)
 385                 return true;
 386
 387         return get_seconds() >= th->renew_after;
 388 }
 389
 390 static bool have_key(struct ceph_x_ticket_handler *th)
 391 {
 392         if (th->have_key) {
 393                 if (get_seconds() >= th->expires)
 394                         th->have_key = false;
 395         }
 396
 397         return th->have_key;
 398 }
 399
 400 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
 401 {
 402         int want = ac->want_keys;
 403         struct ceph_x_info *xi = ac->private;
 404         int service;
 405
 406         *pneed = ac->want_keys & ~(xi->have_keys);
 407
 408         for (service = 1; service <= want; service <<= 1) {
 409                 struct ceph_x_ticket_handler *th;
 410
 411                 if (!(ac->want_keys & service))
 412                         continue;
 413
 414                 if (*pneed & service)
 415                         continue;
 416
 417                 th = get_ticket_handler(ac, service);
 418                 if (IS_ERR(th)) {
 419                         *pneed |= service;
 420                         continue;
 421                 }
 422
 423                 if (need_key(th))
 424                         *pneed |= service;
 425                 if (!have_key(th))
 426                         xi->have_keys &= ~service;
 427         }
 428 }
 429
 430 static int ceph_x_build_request(struct ceph_auth_client *ac,
 431                                 void *buf, void *end)
 432 {
 433         struct ceph_x_info *xi = ac->private;
 434         int need;
 435         struct ceph_x_request_header *head = buf;
 436         int ret;
 437         struct ceph_x_ticket_handler *th =
 438                 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 439
 440         if (IS_ERR(th))
 441                 return PTR_ERR(th);
 442
 443         ceph_x_validate_tickets(ac, &need);
 444
 445         dout("build_request want %x have %x need %x\n",
 446              ac->want_keys, xi->have_keys, need);
 447
 448         if (need & CEPH_ENTITY_TYPE_AUTH) {
 449                 struct ceph_x_authenticate *auth = (void *)(head + 1);
 450                 void *p = auth + 1;
 451                 void *enc_buf = xi->auth_authorizer.enc_buf;
 452                 struct ceph_x_challenge_blob *blob = enc_buf +
 453                                                         ceph_x_encrypt_offset();
 454                 u64 *u;
 455
 456                 if (p > end)
 457                         return -ERANGE;
 458
 459                 dout(" get_auth_session_key\n");
 460                 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
 461
 462                 /* encrypt and hash */
 463                 get_random_bytes(&auth->client_challenge, sizeof(u64));
 464                 blob->client_challenge = auth->client_challenge;
 465                 blob->server_challenge = cpu_to_le64(xi->server_challenge);
 466                 ret = ceph_x_encrypt(&xi->secret, enc_buf, CEPHX_AU_ENC_BUF_LEN,
 467                                      sizeof(*blob));
 468                 if (ret < 0)
 469                         return ret;
 470
 471                 auth->struct_v = 1;
 472                 auth->key = 0;
 473                 for (u = (u64 *)enc_buf; u + 1 <= (u64 *)(enc_buf + ret); u++)
 474                         auth->key ^= *(__le64 *)u;
 475                 dout(" server_challenge %llx client_challenge %llx key %llx\n",
 476                      xi->server_challenge, le64_to_cpu(auth->client_challenge),
 477                      le64_to_cpu(auth->key));
 478
 479                 /* now encode the old ticket if exists */
 480                 ret = ceph_x_encode_ticket(th, &p, end);
 481                 if (ret < 0)
 482                         return ret;
 483
 484                 return p - buf;
 485         }
 486
 487         if (need) {
 488                 void *p = head + 1;
 489                 struct ceph_x_service_ticket_request *req;
 490
 491                 if (p > end)
 492                         return -ERANGE;
 493                 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
 494
 495                 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
 496                 if (ret)
 497                         return ret;
 498                 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
 499                                  xi->auth_authorizer.buf->vec.iov_len);
 500
 501                 req = p;
 502                 req->keys = cpu_to_le32(need);
 503                 p += sizeof(*req);
 504                 return p - buf;
 505         }
 506
 507         return 0;
 508 }
 509
 510 static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
 511                                void *buf, void *end)
 512 {
 513         struct ceph_x_info *xi = ac->private;
 514         struct ceph_x_reply_header *head = buf;
 515         struct ceph_x_ticket_handler *th;
 516         int len = end - buf;
 517         int op;
 518         int ret;
 519
 520         if (result)
 521                 return result;  /* XXX hmm? */
 522
 523         if (xi->starting) {
 524                 /* it's a hello */
 525                 struct ceph_x_server_challenge *sc = buf;
 526
 527                 if (len != sizeof(*sc))
 528                         return -EINVAL;
 529                 xi->server_challenge = le64_to_cpu(sc->server_challenge);
 530                 dout("handle_reply got server challenge %llx\n",
 531                      xi->server_challenge);
 532                 xi->starting = false;
 533                 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
 534                 return -EAGAIN;
 535         }
 536
 537         op = le16_to_cpu(head->op);
 538         result = le32_to_cpu(head->result);
 539         dout("handle_reply op %d result %d\n", op, result);
 540         switch (op) {
 541         case CEPHX_GET_AUTH_SESSION_KEY:
 542                 /* verify auth key */
 543                 ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
 544                                                buf + sizeof(*head), end);
 545                 break;
 546
 547         case CEPHX_GET_PRINCIPAL_SESSION_KEY:
 548                 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 549                 if (IS_ERR(th))
 550                         return PTR_ERR(th);
 551                 ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
 552                                                buf + sizeof(*head), end);
 553                 break;
 554
 555         default:
 556                 return -EINVAL;
 557         }
 558         if (ret)
 559                 return ret;
 560         if (ac->want_keys == xi->have_keys)
 561                 return 0;
 562         return -EAGAIN;
 563 }
 564
 565 static void ceph_x_destroy_authorizer(struct ceph_authorizer *a)
 566 {
 567         struct ceph_x_authorizer *au = (void *)a;
 568
 569         ceph_x_authorizer_cleanup(au);
 570         kfree(au);
 571 }
 572
 573 static int ceph_x_create_authorizer(
 574         struct ceph_auth_client *ac, int peer_type,
 575         struct ceph_auth_handshake *auth)
 576 {
 577         struct ceph_x_authorizer *au;
 578         struct ceph_x_ticket_handler *th;
 579         int ret;
 580
 581         th = get_ticket_handler(ac, peer_type);
 582         if (IS_ERR(th))
 583                 return PTR_ERR(th);
 584
 585         au = kzalloc(sizeof(*au), GFP_NOFS);
 586         if (!au)
 587                 return -ENOMEM;
 588
 589         au->base.destroy = ceph_x_destroy_authorizer;
 590
 591         ret = ceph_x_build_authorizer(ac, th, au);
 592         if (ret) {
 593                 kfree(au);
 594                 return ret;
 595         }
 596
 597         auth->authorizer = (struct ceph_authorizer *) au;
 598         auth->authorizer_buf = au->buf->vec.iov_base;
 599         auth->authorizer_buf_len = au->buf->vec.iov_len;
 600         auth->authorizer_reply_buf = au->enc_buf;
 601         auth->authorizer_reply_buf_len = CEPHX_AU_ENC_BUF_LEN;
 602         auth->sign_message = ac->ops->sign_message;
 603         auth->check_message_signature = ac->ops->check_message_signature;
 604
 605         return 0;
 606 }
 607
 608 static int ceph_x_update_authorizer(
 609         struct ceph_auth_client *ac, int peer_type,
 610         struct ceph_auth_handshake *auth)
 611 {
 612         struct ceph_x_authorizer *au;
 613         struct ceph_x_ticket_handler *th;
 614
 615         th = get_ticket_handler(ac, peer_type);
 616         if (IS_ERR(th))
 617                 return PTR_ERR(th);
 618
 619         au = (struct ceph_x_authorizer *)auth->authorizer;
 620         if (au->secret_id < th->secret_id) {
 621                 dout("ceph_x_update_authorizer service %u secret %llu < %llu\n",
 622                      au->service, au->secret_id, th->secret_id);
 623                 return ceph_x_build_authorizer(ac, th, au);
 624         }
 625         return 0;
 626 }
 627
 628 static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
 629                                           struct ceph_authorizer *a)
 630 {
 631         struct ceph_x_authorizer *au = (void *)a;
 632         void *p = au->enc_buf;
 633         struct ceph_x_authorize_reply *reply = p + ceph_x_encrypt_offset();
 634         int ret;
 635
 636         ret = ceph_x_decrypt(&au->session_key, &p, p + CEPHX_AU_ENC_BUF_LEN);
 637         if (ret < 0)
 638                 return ret;
 639         if (ret != sizeof(*reply))
 640                 return -EPERM;
 641
 642         if (au->nonce + 1 != le64_to_cpu(reply->nonce_plus_one))
 643                 ret = -EPERM;
 644         else
 645                 ret = 0;
 646         dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
 647              au->nonce, le64_to_cpu(reply->nonce_plus_one), ret);
 648         return ret;
 649 }
 650
 651 static void ceph_x_reset(struct ceph_auth_client *ac)
 652 {
 653         struct ceph_x_info *xi = ac->private;
 654
 655         dout("reset\n");
 656         xi->starting = true;
 657         xi->server_challenge = 0;
 658 }
 659
 660 static void ceph_x_destroy(struct ceph_auth_client *ac)
 661 {
 662         struct ceph_x_info *xi = ac->private;
 663         struct rb_node *p;
 664
 665         dout("ceph_x_destroy %p\n", ac);
 666         ceph_crypto_key_destroy(&xi->secret);
 667
 668         while ((p = rb_first(&xi->ticket_handlers)) != NULL) {
 669                 struct ceph_x_ticket_handler *th =
 670                         rb_entry(p, struct ceph_x_ticket_handler, node);
 671                 remove_ticket_handler(ac, th);
 672         }
 673
 674         ceph_x_authorizer_cleanup(&xi->auth_authorizer);
 675
 676         kfree(ac->private);
 677         ac->private = NULL;
 678 }
 679
 680 static void invalidate_ticket(struct ceph_auth_client *ac, int peer_type)
 681 {
 682         struct ceph_x_ticket_handler *th;
 683
 684         th = get_ticket_handler(ac, peer_type);
 685         if (!IS_ERR(th))
 686                 th->have_key = false;
 687 }
 688
 689 static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
 690                                          int peer_type)
 691 {
 692         /*
 693          * We are to invalidate a service ticket in the hopes of
 694          * getting a new, hopefully more valid, one.  But, we won't get
 695          * it unless our AUTH ticket is good, so invalidate AUTH ticket
 696          * as well, just in case.
 697          */
 698         invalidate_ticket(ac, peer_type);
 699         invalidate_ticket(ac, CEPH_ENTITY_TYPE_AUTH);
 700 }
 701
 702 static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg,
 703                           __le64 *psig)
 704 {
 705         void *enc_buf = au->enc_buf;
 706         struct {
 707                 __le32 len;
 708                 __le32 header_crc;
 709                 __le32 front_crc;
 710                 __le32 middle_crc;
 711                 __le32 data_crc;
 712         } __packed *sigblock = enc_buf + ceph_x_encrypt_offset();
 713         int ret;
 714
 715         sigblock->len = cpu_to_le32(4*sizeof(u32));
 716         sigblock->header_crc = msg->hdr.crc;
 717         sigblock->front_crc = msg->footer.front_crc;
 718         sigblock->middle_crc = msg->footer.middle_crc;
 719         sigblock->data_crc =  msg->footer.data_crc;
 720         ret = ceph_x_encrypt(&au->session_key, enc_buf, CEPHX_AU_ENC_BUF_LEN,
 721                              sizeof(*sigblock));
 722         if (ret < 0)
 723                 return ret;
 724
 725         *psig = *(__le64 *)(enc_buf + sizeof(u32));
 726         return 0;
 727 }
 728
 729 static int ceph_x_sign_message(struct ceph_auth_handshake *auth,
 730                                struct ceph_msg *msg)
 731 {
 732         __le64 sig;
 733         int ret;
 734
 735         if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN))
 736                 return 0;
 737
 738         ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer,
 739                              msg, &sig);
 740         if (ret)
 741                 return ret;
 742
 743         msg->footer.sig = sig;
 744         msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED;
 745         return 0;
 746 }
 747
 748 static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth,
 749                                           struct ceph_msg *msg)
 750 {
 751         __le64 sig_check;
 752         int ret;
 753
 754         if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN))
 755                 return 0;
 756
 757         ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer,
 758                              msg, &sig_check);
 759         if (ret)
 760                 return ret;
 761         if (sig_check == msg->footer.sig)
 762                 return 0;
 763         if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED)
 764                 dout("ceph_x_check_message_signature %p has signature %llx "
 765                      "expect %llx\n", msg, msg->footer.sig, sig_check);
 766         else
 767                 dout("ceph_x_check_message_signature %p sender did not set "
 768                      "CEPH_MSG_FOOTER_SIGNED\n", msg);
 769         return -EBADMSG;
 770 }
 771
 772 static const struct ceph_auth_client_ops ceph_x_ops = {
 773         .name = "x",
 774         .is_authenticated = ceph_x_is_authenticated,
 775         .should_authenticate = ceph_x_should_authenticate,
 776         .build_request = ceph_x_build_request,
 777         .handle_reply = ceph_x_handle_reply,
 778         .create_authorizer = ceph_x_create_authorizer,
 779         .update_authorizer = ceph_x_update_authorizer,
 780         .verify_authorizer_reply = ceph_x_verify_authorizer_reply,
 781         .invalidate_authorizer = ceph_x_invalidate_authorizer,
 782         .reset =  ceph_x_reset,
 783         .destroy = ceph_x_destroy,
 784         .sign_message = ceph_x_sign_message,
 785         .check_message_signature = ceph_x_check_message_signature,
 786 };
 787
 788
 789 int ceph_x_init(struct ceph_auth_client *ac)
 790 {
 791         struct ceph_x_info *xi;
 792         int ret;
 793
 794         dout("ceph_x_init %p\n", ac);
 795         ret = -ENOMEM;
 796         xi = kzalloc(sizeof(*xi), GFP_NOFS);
 797         if (!xi)
 798                 goto out;
 799
 800         ret = -EINVAL;
 801         if (!ac->key) {
 802                 pr_err("no secret set (for auth_x protocol)\n");
 803                 goto out_nomem;
 804         }
 805
 806         ret = ceph_crypto_key_clone(&xi->secret, ac->key);
 807         if (ret < 0) {
 808                 pr_err("cannot clone key: %d\n", ret);
 809                 goto out_nomem;
 810         }
 811
 812         xi->starting = true;
 813         xi->ticket_handlers = RB_ROOT;
 814
 815         ac->protocol = CEPH_AUTH_CEPHX;
 816         ac->private = xi;
 817         ac->ops = &ceph_x_ops;
 818         return 0;
 819
 820 out_nomem:
 821         kfree(xi);
 822 out:
 823         return ret;
 824 }
 825
 826