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;
 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         new_secret_id = ceph_decode_64(ptp);
 219         ret = ceph_decode_buffer(&new_ticket_blob, ptp, tpend);
 220         if (ret)
 221                 goto out;
 222
 223         /* all is well, update our ticket */
 224         ceph_crypto_key_destroy(&th->session_key);
 225         if (th->ticket_blob)
 226                 ceph_buffer_put(th->ticket_blob);
 227         th->session_key = new_session_key;
 228         th->ticket_blob = new_ticket_blob;
 229         th->secret_id = new_secret_id;
 230         th->expires = new_expires;
 231         th->renew_after = new_renew_after;
 232         th->have_key = true;
 233         dout(" got ticket service %d (%s) secret_id %lld len %d\n",
 234              type, ceph_entity_type_name(type), th->secret_id,
 235              (int)th->ticket_blob->vec.iov_len);
 236         xi->have_keys |= th->service;
 237
 238 out:
 239         return ret;
 240
 241 bad:
 242         ret = -EINVAL;
 243         goto out;
 244 }
 245
 246 static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
 247                                     struct ceph_crypto_key *secret,
 248                                     void *buf, void *end)
 249 {
 250         void *p = buf;
 251         u8 reply_struct_v;
 252         u32 num;
 253         int ret;
 254
 255         ceph_decode_8_safe(&p, end, reply_struct_v, bad);
 256         if (reply_struct_v != 1)
 257                 return -EINVAL;
 258
 259         ceph_decode_32_safe(&p, end, num, bad);
 260         dout("%d tickets\n", num);
 261
 262         while (num--) {
 263                 ret = process_one_ticket(ac, secret, &p, end);
 264                 if (ret)
 265                         return ret;
 266         }
 267
 268         return 0;
 269
 270 bad:
 271         return -EINVAL;
 272 }
 273
 274 static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au)
 275 {
 276         ceph_crypto_key_destroy(&au->session_key);
 277         if (au->buf) {
 278                 ceph_buffer_put(au->buf);
 279                 au->buf = NULL;
 280         }
 281 }
 282
 283 static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
 284                                    struct ceph_x_ticket_handler *th,
 285                                    struct ceph_x_authorizer *au)
 286 {
 287         int maxlen;
 288         struct ceph_x_authorize_a *msg_a;
 289         struct ceph_x_authorize_b *msg_b;
 290         void *p, *end;
 291         int ret;
 292         int ticket_blob_len =
 293                 (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0);
 294
 295         dout("build_authorizer for %s %p\n",
 296              ceph_entity_type_name(th->service), au);
 297
 298         ceph_crypto_key_destroy(&au->session_key);
 299         ret = ceph_crypto_key_clone(&au->session_key, &th->session_key);
 300         if (ret)
 301                 goto out_au;
 302
 303         maxlen = sizeof(*msg_a) + ticket_blob_len +
 304                 ceph_x_encrypt_buflen(sizeof(*msg_b));
 305         dout("  need len %d\n", maxlen);
 306         if (au->buf && au->buf->alloc_len < maxlen) {
 307                 ceph_buffer_put(au->buf);
 308                 au->buf = NULL;
 309         }
 310         if (!au->buf) {
 311                 au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
 312                 if (!au->buf) {
 313                         ret = -ENOMEM;
 314                         goto out_au;
 315                 }
 316         }
 317         au->service = th->service;
 318         au->secret_id = th->secret_id;
 319
 320         msg_a = au->buf->vec.iov_base;
 321         msg_a->struct_v = 1;
 322         msg_a->global_id = cpu_to_le64(ac->global_id);
 323         msg_a->service_id = cpu_to_le32(th->service);
 324         msg_a->ticket_blob.struct_v = 1;
 325         msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
 326         msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
 327         if (ticket_blob_len) {
 328                 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
 329                        th->ticket_blob->vec.iov_len);
 330         }
 331         dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
 332              le64_to_cpu(msg_a->ticket_blob.secret_id));
 333
 334         p = msg_a + 1;
 335         p += ticket_blob_len;
 336         end = au->buf->vec.iov_base + au->buf->vec.iov_len;
 337
 338         msg_b = p + ceph_x_encrypt_offset();
 339         msg_b->struct_v = 1;
 340         get_random_bytes(&au->nonce, sizeof(au->nonce));
 341         msg_b->nonce = cpu_to_le64(au->nonce);
 342         ret = ceph_x_encrypt(&au->session_key, p, end - p, sizeof(*msg_b));
 343         if (ret < 0)
 344                 goto out_au;
 345
 346         p += ret;
 347         WARN_ON(p > end);
 348         au->buf->vec.iov_len = p - au->buf->vec.iov_base;
 349         dout(" built authorizer nonce %llx len %d\n", au->nonce,
 350              (int)au->buf->vec.iov_len);
 351         return 0;
 352
 353 out_au:
 354         ceph_x_authorizer_cleanup(au);
 355         return ret;
 356 }
 357
 358 static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
 359                                 void **p, void *end)
 360 {
 361         ceph_decode_need(p, end, 1 + sizeof(u64), bad);
 362         ceph_encode_8(p, 1);
 363         ceph_encode_64(p, th->secret_id);
 364         if (th->ticket_blob) {
 365                 const char *buf = th->ticket_blob->vec.iov_base;
 366                 u32 len = th->ticket_blob->vec.iov_len;
 367
 368                 ceph_encode_32_safe(p, end, len, bad);
 369                 ceph_encode_copy_safe(p, end, buf, len, bad);
 370         } else {
 371                 ceph_encode_32_safe(p, end, 0, bad);
 372         }
 373
 374         return 0;
 375 bad:
 376         return -ERANGE;
 377 }
 378
 379 static bool need_key(struct ceph_x_ticket_handler *th)
 380 {
 381         if (!th->have_key)
 382                 return true;
 383
 384         return get_seconds() >= th->renew_after;
 385 }
 386
 387 static bool have_key(struct ceph_x_ticket_handler *th)
 388 {
 389         if (th->have_key) {
 390                 if (get_seconds() >= th->expires)
 391                         th->have_key = false;
 392         }
 393
 394         return th->have_key;
 395 }
 396
 397 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
 398 {
 399         int want = ac->want_keys;
 400         struct ceph_x_info *xi = ac->private;
 401         int service;
 402
 403         *pneed = ac->want_keys & ~(xi->have_keys);
 404
 405         for (service = 1; service <= want; service <<= 1) {
 406                 struct ceph_x_ticket_handler *th;
 407
 408                 if (!(ac->want_keys & service))
 409                         continue;
 410
 411                 if (*pneed & service)
 412                         continue;
 413
 414                 th = get_ticket_handler(ac, service);
 415                 if (IS_ERR(th)) {
 416                         *pneed |= service;
 417                         continue;
 418                 }
 419
 420                 if (need_key(th))
 421                         *pneed |= service;
 422                 if (!have_key(th))
 423                         xi->have_keys &= ~service;
 424         }
 425 }
 426
 427 static int ceph_x_build_request(struct ceph_auth_client *ac,
 428                                 void *buf, void *end)
 429 {
 430         struct ceph_x_info *xi = ac->private;
 431         int need;
 432         struct ceph_x_request_header *head = buf;
 433         int ret;
 434         struct ceph_x_ticket_handler *th =
 435                 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 436
 437         if (IS_ERR(th))
 438                 return PTR_ERR(th);
 439
 440         ceph_x_validate_tickets(ac, &need);
 441
 442         dout("build_request want %x have %x need %x\n",
 443              ac->want_keys, xi->have_keys, need);
 444
 445         if (need & CEPH_ENTITY_TYPE_AUTH) {
 446                 struct ceph_x_authenticate *auth = (void *)(head + 1);
 447                 void *p = auth + 1;
 448                 void *enc_buf = xi->auth_authorizer.enc_buf;
 449                 struct ceph_x_challenge_blob *blob = enc_buf +
 450                                                         ceph_x_encrypt_offset();
 451                 u64 *u;
 452
 453                 if (p > end)
 454                         return -ERANGE;
 455
 456                 dout(" get_auth_session_key\n");
 457                 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
 458
 459                 /* encrypt and hash */
 460                 get_random_bytes(&auth->client_challenge, sizeof(u64));
 461                 blob->client_challenge = auth->client_challenge;
 462                 blob->server_challenge = cpu_to_le64(xi->server_challenge);
 463                 ret = ceph_x_encrypt(&xi->secret, enc_buf, CEPHX_AU_ENC_BUF_LEN,
 464                                      sizeof(*blob));
 465                 if (ret < 0)
 466                         return ret;
 467
 468                 auth->struct_v = 1;
 469                 auth->key = 0;
 470                 for (u = (u64 *)enc_buf; u + 1 <= (u64 *)(enc_buf + ret); u++)
 471                         auth->key ^= *(__le64 *)u;
 472                 dout(" server_challenge %llx client_challenge %llx key %llx\n",
 473                      xi->server_challenge, le64_to_cpu(auth->client_challenge),
 474                      le64_to_cpu(auth->key));
 475
 476                 /* now encode the old ticket if exists */
 477                 ret = ceph_x_encode_ticket(th, &p, end);
 478                 if (ret < 0)
 479                         return ret;
 480
 481                 return p - buf;
 482         }
 483
 484         if (need) {
 485                 void *p = head + 1;
 486                 struct ceph_x_service_ticket_request *req;
 487
 488                 if (p > end)
 489                         return -ERANGE;
 490                 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
 491
 492                 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
 493                 if (ret)
 494                         return ret;
 495                 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
 496                                  xi->auth_authorizer.buf->vec.iov_len);
 497
 498                 req = p;
 499                 req->keys = cpu_to_le32(need);
 500                 p += sizeof(*req);
 501                 return p - buf;
 502         }
 503
 504         return 0;
 505 }
 506
 507 static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
 508                                void *buf, void *end)
 509 {
 510         struct ceph_x_info *xi = ac->private;
 511         struct ceph_x_reply_header *head = buf;
 512         struct ceph_x_ticket_handler *th;
 513         int len = end - buf;
 514         int op;
 515         int ret;
 516
 517         if (result)
 518                 return result;  /* XXX hmm? */
 519
 520         if (xi->starting) {
 521                 /* it's a hello */
 522                 struct ceph_x_server_challenge *sc = buf;
 523
 524                 if (len != sizeof(*sc))
 525                         return -EINVAL;
 526                 xi->server_challenge = le64_to_cpu(sc->server_challenge);
 527                 dout("handle_reply got server challenge %llx\n",
 528                      xi->server_challenge);
 529                 xi->starting = false;
 530                 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
 531                 return -EAGAIN;
 532         }
 533
 534         op = le16_to_cpu(head->op);
 535         result = le32_to_cpu(head->result);
 536         dout("handle_reply op %d result %d\n", op, result);
 537         switch (op) {
 538         case CEPHX_GET_AUTH_SESSION_KEY:
 539                 /* verify auth key */
 540                 ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
 541                                                buf + sizeof(*head), end);
 542                 break;
 543
 544         case CEPHX_GET_PRINCIPAL_SESSION_KEY:
 545                 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 546                 if (IS_ERR(th))
 547                         return PTR_ERR(th);
 548                 ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
 549                                                buf + sizeof(*head), end);
 550                 break;
 551
 552         default:
 553                 return -EINVAL;
 554         }
 555         if (ret)
 556                 return ret;
 557         if (ac->want_keys == xi->have_keys)
 558                 return 0;
 559         return -EAGAIN;
 560 }
 561
 562 static void ceph_x_destroy_authorizer(struct ceph_authorizer *a)
 563 {
 564         struct ceph_x_authorizer *au = (void *)a;
 565
 566         ceph_x_authorizer_cleanup(au);
 567         kfree(au);
 568 }
 569
 570 static int ceph_x_create_authorizer(
 571         struct ceph_auth_client *ac, int peer_type,
 572         struct ceph_auth_handshake *auth)
 573 {
 574         struct ceph_x_authorizer *au;
 575         struct ceph_x_ticket_handler *th;
 576         int ret;
 577
 578         th = get_ticket_handler(ac, peer_type);
 579         if (IS_ERR(th))
 580                 return PTR_ERR(th);
 581
 582         au = kzalloc(sizeof(*au), GFP_NOFS);
 583         if (!au)
 584                 return -ENOMEM;
 585
 586         au->base.destroy = ceph_x_destroy_authorizer;
 587
 588         ret = ceph_x_build_authorizer(ac, th, au);
 589         if (ret) {
 590                 kfree(au);
 591                 return ret;
 592         }
 593
 594         auth->authorizer = (struct ceph_authorizer *) au;
 595         auth->authorizer_buf = au->buf->vec.iov_base;
 596         auth->authorizer_buf_len = au->buf->vec.iov_len;
 597         auth->authorizer_reply_buf = au->enc_buf;
 598         auth->authorizer_reply_buf_len = CEPHX_AU_ENC_BUF_LEN;
 599         auth->sign_message = ac->ops->sign_message;
 600         auth->check_message_signature = ac->ops->check_message_signature;
 601
 602         return 0;
 603 }
 604
 605 static int ceph_x_update_authorizer(
 606         struct ceph_auth_client *ac, int peer_type,
 607         struct ceph_auth_handshake *auth)
 608 {
 609         struct ceph_x_authorizer *au;
 610         struct ceph_x_ticket_handler *th;
 611
 612         th = get_ticket_handler(ac, peer_type);
 613         if (IS_ERR(th))
 614                 return PTR_ERR(th);
 615
 616         au = (struct ceph_x_authorizer *)auth->authorizer;
 617         if (au->secret_id < th->secret_id) {
 618                 dout("ceph_x_update_authorizer service %u secret %llu < %llu\n",
 619                      au->service, au->secret_id, th->secret_id);
 620                 return ceph_x_build_authorizer(ac, th, au);
 621         }
 622         return 0;
 623 }
 624
 625 static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
 626                                           struct ceph_authorizer *a)
 627 {
 628         struct ceph_x_authorizer *au = (void *)a;
 629         void *p = au->enc_buf;
 630         struct ceph_x_authorize_reply *reply = p + ceph_x_encrypt_offset();
 631         int ret;
 632
 633         ret = ceph_x_decrypt(&au->session_key, &p, p + CEPHX_AU_ENC_BUF_LEN);
 634         if (ret < 0)
 635                 return ret;
 636         if (ret != sizeof(*reply))
 637                 return -EPERM;
 638
 639         if (au->nonce + 1 != le64_to_cpu(reply->nonce_plus_one))
 640                 ret = -EPERM;
 641         else
 642                 ret = 0;
 643         dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
 644              au->nonce, le64_to_cpu(reply->nonce_plus_one), ret);
 645         return ret;
 646 }
 647
 648 static void ceph_x_reset(struct ceph_auth_client *ac)
 649 {
 650         struct ceph_x_info *xi = ac->private;
 651
 652         dout("reset\n");
 653         xi->starting = true;
 654         xi->server_challenge = 0;
 655 }
 656
 657 static void ceph_x_destroy(struct ceph_auth_client *ac)
 658 {
 659         struct ceph_x_info *xi = ac->private;
 660         struct rb_node *p;
 661
 662         dout("ceph_x_destroy %p\n", ac);
 663         ceph_crypto_key_destroy(&xi->secret);
 664
 665         while ((p = rb_first(&xi->ticket_handlers)) != NULL) {
 666                 struct ceph_x_ticket_handler *th =
 667                         rb_entry(p, struct ceph_x_ticket_handler, node);
 668                 remove_ticket_handler(ac, th);
 669         }
 670
 671         ceph_x_authorizer_cleanup(&xi->auth_authorizer);
 672
 673         kfree(ac->private);
 674         ac->private = NULL;
 675 }
 676
 677 static void invalidate_ticket(struct ceph_auth_client *ac, int peer_type)
 678 {
 679         struct ceph_x_ticket_handler *th;
 680
 681         th = get_ticket_handler(ac, peer_type);
 682         if (!IS_ERR(th))
 683                 th->have_key = false;
 684 }
 685
 686 static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
 687                                          int peer_type)
 688 {
 689         /*
 690          * We are to invalidate a service ticket in the hopes of
 691          * getting a new, hopefully more valid, one.  But, we won't get
 692          * it unless our AUTH ticket is good, so invalidate AUTH ticket
 693          * as well, just in case.
 694          */
 695         invalidate_ticket(ac, peer_type);
 696         invalidate_ticket(ac, CEPH_ENTITY_TYPE_AUTH);
 697 }
 698
 699 static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg,
 700                           __le64 *psig)
 701 {
 702         void *enc_buf = au->enc_buf;
 703         struct {
 704                 __le32 len;
 705                 __le32 header_crc;
 706                 __le32 front_crc;
 707                 __le32 middle_crc;
 708                 __le32 data_crc;
 709         } __packed *sigblock = enc_buf + ceph_x_encrypt_offset();
 710         int ret;
 711
 712         sigblock->len = cpu_to_le32(4*sizeof(u32));
 713         sigblock->header_crc = msg->hdr.crc;
 714         sigblock->front_crc = msg->footer.front_crc;
 715         sigblock->middle_crc = msg->footer.middle_crc;
 716         sigblock->data_crc =  msg->footer.data_crc;
 717         ret = ceph_x_encrypt(&au->session_key, enc_buf, CEPHX_AU_ENC_BUF_LEN,
 718                              sizeof(*sigblock));
 719         if (ret < 0)
 720                 return ret;
 721
 722         *psig = *(__le64 *)(enc_buf + sizeof(u32));
 723         return 0;
 724 }
 725
 726 static int ceph_x_sign_message(struct ceph_auth_handshake *auth,
 727                                struct ceph_msg *msg)
 728 {
 729         __le64 sig;
 730         int ret;
 731
 732         if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN))
 733                 return 0;
 734
 735         ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer,
 736                              msg, &sig);
 737         if (ret)
 738                 return ret;
 739
 740         msg->footer.sig = sig;
 741         msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED;
 742         return 0;
 743 }
 744
 745 static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth,
 746                                           struct ceph_msg *msg)
 747 {
 748         __le64 sig_check;
 749         int ret;
 750
 751         if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN))
 752                 return 0;
 753
 754         ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer,
 755                              msg, &sig_check);
 756         if (ret)
 757                 return ret;
 758         if (sig_check == msg->footer.sig)
 759                 return 0;
 760         if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED)
 761                 dout("ceph_x_check_message_signature %p has signature %llx "
 762                      "expect %llx\n", msg, msg->footer.sig, sig_check);
 763         else
 764                 dout("ceph_x_check_message_signature %p sender did not set "
 765                      "CEPH_MSG_FOOTER_SIGNED\n", msg);
 766         return -EBADMSG;
 767 }
 768
 769 static const struct ceph_auth_client_ops ceph_x_ops = {
 770         .name = "x",
 771         .is_authenticated = ceph_x_is_authenticated,
 772         .should_authenticate = ceph_x_should_authenticate,
 773         .build_request = ceph_x_build_request,
 774         .handle_reply = ceph_x_handle_reply,
 775         .create_authorizer = ceph_x_create_authorizer,
 776         .update_authorizer = ceph_x_update_authorizer,
 777         .verify_authorizer_reply = ceph_x_verify_authorizer_reply,
 778         .invalidate_authorizer = ceph_x_invalidate_authorizer,
 779         .reset =  ceph_x_reset,
 780         .destroy = ceph_x_destroy,
 781         .sign_message = ceph_x_sign_message,
 782         .check_message_signature = ceph_x_check_message_signature,
 783 };
 784
 785
 786 int ceph_x_init(struct ceph_auth_client *ac)
 787 {
 788         struct ceph_x_info *xi;
 789         int ret;
 790
 791         dout("ceph_x_init %p\n", ac);
 792         ret = -ENOMEM;
 793         xi = kzalloc(sizeof(*xi), GFP_NOFS);
 794         if (!xi)
 795                 goto out;
 796
 797         ret = -EINVAL;
 798         if (!ac->key) {
 799                 pr_err("no secret set (for auth_x protocol)\n");
 800                 goto out_nomem;
 801         }
 802
 803         ret = ceph_crypto_key_clone(&xi->secret, ac->key);
 804         if (ret < 0) {
 805                 pr_err("cannot clone key: %d\n", ret);
 806                 goto out_nomem;
 807         }
 808
 809         xi->starting = true;
 810         xi->ticket_handlers = RB_ROOT;
 811
 812         ac->protocol = CEPH_AUTH_CEPHX;
 813         ac->private = xi;
 814         ac->ops = &ceph_x_ops;
 815         return 0;
 816
 817 out_nomem:
 818         kfree(xi);
 819 out:
 820         return ret;
 821 }
 822
 823