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_buflen(int ilen)
  43 {
  44         return sizeof(struct ceph_x_encrypt_header) + ilen + 16 +
  45                 sizeof(u32);
  46 }
  47
  48 static int ceph_x_encrypt(struct ceph_crypto_key *secret,
  49                           void *ibuf, int ilen, void *obuf, size_t olen)
  50 {
  51         struct ceph_x_encrypt_header head = {
  52                 .struct_v = 1,
  53                 .magic = cpu_to_le64(CEPHX_ENC_MAGIC)
  54         };
  55         size_t len = olen - sizeof(u32);
  56         int ret;
  57
  58         ret = ceph_encrypt2(secret, obuf + sizeof(u32), &len,
  59                             &head, sizeof(head), ibuf, ilen);
  60         if (ret)
  61                 return ret;
  62         ceph_encode_32(&obuf, len);
  63         return len + sizeof(u32);
  64 }
  65
  66 static int ceph_x_decrypt(struct ceph_crypto_key *secret,
  67                           void **p, void *end, void **obuf, size_t olen)
  68 {
  69         struct ceph_x_encrypt_header head;
  70         size_t head_len = sizeof(head);
  71         int len, ret;
  72
  73         len = ceph_decode_32(p);
  74         if (*p + len > end)
  75                 return -EINVAL;
  76
  77         dout("ceph_x_decrypt len %d\n", len);
  78         if (*obuf == NULL) {
  79                 *obuf = kmalloc(len, GFP_NOFS);
  80                 if (!*obuf)
  81                         return -ENOMEM;
  82                 olen = len;
  83         }
  84
  85         ret = ceph_decrypt2(secret, &head, &head_len, *obuf, &olen, *p, len);
  86         if (ret)
  87                 return ret;
  88         if (head.struct_v != 1 || le64_to_cpu(head.magic) != CEPHX_ENC_MAGIC)
  89                 return -EPERM;
  90         *p += len;
  91         return olen;
  92 }
  93
  94 /*
  95  * get existing (or insert new) ticket handler
  96  */
  97 static struct ceph_x_ticket_handler *
  98 get_ticket_handler(struct ceph_auth_client *ac, int service)
  99 {
 100         struct ceph_x_ticket_handler *th;
 101         struct ceph_x_info *xi = ac->private;
 102         struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node;
 103
 104         while (*p) {
 105                 parent = *p;
 106                 th = rb_entry(parent, struct ceph_x_ticket_handler, node);
 107                 if (service < th->service)
 108                         p = &(*p)->rb_left;
 109                 else if (service > th->service)
 110                         p = &(*p)->rb_right;
 111                 else
 112                         return th;
 113         }
 114
 115         /* add it */
 116         th = kzalloc(sizeof(*th), GFP_NOFS);
 117         if (!th)
 118                 return ERR_PTR(-ENOMEM);
 119         th->service = service;
 120         rb_link_node(&th->node, parent, p);
 121         rb_insert_color(&th->node, &xi->ticket_handlers);
 122         return th;
 123 }
 124
 125 static void remove_ticket_handler(struct ceph_auth_client *ac,
 126                                   struct ceph_x_ticket_handler *th)
 127 {
 128         struct ceph_x_info *xi = ac->private;
 129
 130         dout("remove_ticket_handler %p %d\n", th, th->service);
 131         rb_erase(&th->node, &xi->ticket_handlers);
 132         ceph_crypto_key_destroy(&th->session_key);
 133         if (th->ticket_blob)
 134                 ceph_buffer_put(th->ticket_blob);
 135         kfree(th);
 136 }
 137
 138 static int process_one_ticket(struct ceph_auth_client *ac,
 139                               struct ceph_crypto_key *secret,
 140                               void **p, void *end)
 141 {
 142         struct ceph_x_info *xi = ac->private;
 143         int type;
 144         u8 tkt_struct_v, blob_struct_v;
 145         struct ceph_x_ticket_handler *th;
 146         void *dbuf = NULL;
 147         void *dp, *dend;
 148         int dlen;
 149         char is_enc;
 150         struct timespec validity;
 151         struct ceph_crypto_key old_key;
 152         void *ticket_buf = NULL;
 153         void *tp, *tpend;
 154         void **ptp;
 155         struct ceph_crypto_key new_session_key;
 156         struct ceph_buffer *new_ticket_blob;
 157         unsigned long new_expires, new_renew_after;
 158         u64 new_secret_id;
 159         int ret;
 160
 161         ceph_decode_need(p, end, sizeof(u32) + 1, bad);
 162
 163         type = ceph_decode_32(p);
 164         dout(" ticket type %d %s\n", type, ceph_entity_type_name(type));
 165
 166         tkt_struct_v = ceph_decode_8(p);
 167         if (tkt_struct_v != 1)
 168                 goto bad;
 169
 170         th = get_ticket_handler(ac, type);
 171         if (IS_ERR(th)) {
 172                 ret = PTR_ERR(th);
 173                 goto out;
 174         }
 175
 176         /* blob for me */
 177         dlen = ceph_x_decrypt(secret, p, end, &dbuf, 0);
 178         if (dlen <= 0) {
 179                 ret = dlen;
 180                 goto out;
 181         }
 182         dout(" decrypted %d bytes\n", dlen);
 183         dp = dbuf;
 184         dend = dp + dlen;
 185
 186         tkt_struct_v = ceph_decode_8(&dp);
 187         if (tkt_struct_v != 1)
 188                 goto bad;
 189
 190         memcpy(&old_key, &th->session_key, sizeof(old_key));
 191         ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
 192         if (ret)
 193                 goto out;
 194
 195         ceph_decode_timespec(&validity, dp);
 196         dp += sizeof(struct ceph_timespec);
 197         new_expires = get_seconds() + validity.tv_sec;
 198         new_renew_after = new_expires - (validity.tv_sec / 4);
 199         dout(" expires=%lu renew_after=%lu\n", new_expires,
 200              new_renew_after);
 201
 202         /* ticket blob for service */
 203         ceph_decode_8_safe(p, end, is_enc, bad);
 204         if (is_enc) {
 205                 /* encrypted */
 206                 dout(" encrypted ticket\n");
 207                 dlen = ceph_x_decrypt(&old_key, p, end, &ticket_buf, 0);
 208                 if (dlen < 0) {
 209                         ret = dlen;
 210                         goto out;
 211                 }
 212                 tp = ticket_buf;
 213                 ptp = &tp;
 214                 tpend = *ptp + dlen;
 215         } else {
 216                 /* unencrypted */
 217                 ptp = p;
 218                 tpend = end;
 219         }
 220         ceph_decode_32_safe(ptp, tpend, dlen, bad);
 221         dout(" ticket blob is %d bytes\n", dlen);
 222         ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad);
 223         blob_struct_v = ceph_decode_8(ptp);
 224         new_secret_id = ceph_decode_64(ptp);
 225         ret = ceph_decode_buffer(&new_ticket_blob, ptp, tpend);
 226         if (ret)
 227                 goto out;
 228
 229         /* all is well, update our ticket */
 230         ceph_crypto_key_destroy(&th->session_key);
 231         if (th->ticket_blob)
 232                 ceph_buffer_put(th->ticket_blob);
 233         th->session_key = new_session_key;
 234         th->ticket_blob = new_ticket_blob;
 235         th->secret_id = new_secret_id;
 236         th->expires = new_expires;
 237         th->renew_after = new_renew_after;
 238         th->have_key = true;
 239         dout(" got ticket service %d (%s) secret_id %lld len %d\n",
 240              type, ceph_entity_type_name(type), th->secret_id,
 241              (int)th->ticket_blob->vec.iov_len);
 242         xi->have_keys |= th->service;
 243
 244 out:
 245         kfree(ticket_buf);
 246         kfree(dbuf);
 247         return ret;
 248
 249 bad:
 250         ret = -EINVAL;
 251         goto out;
 252 }
 253
 254 static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
 255                                     struct ceph_crypto_key *secret,
 256                                     void *buf, void *end)
 257 {
 258         void *p = buf;
 259         u8 reply_struct_v;
 260         u32 num;
 261         int ret;
 262
 263         ceph_decode_8_safe(&p, end, reply_struct_v, bad);
 264         if (reply_struct_v != 1)
 265                 return -EINVAL;
 266
 267         ceph_decode_32_safe(&p, end, num, bad);
 268         dout("%d tickets\n", num);
 269
 270         while (num--) {
 271                 ret = process_one_ticket(ac, secret, &p, end);
 272                 if (ret)
 273                         return ret;
 274         }
 275
 276         return 0;
 277
 278 bad:
 279         return -EINVAL;
 280 }
 281
 282 static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au)
 283 {
 284         ceph_crypto_key_destroy(&au->session_key);
 285         if (au->buf) {
 286                 ceph_buffer_put(au->buf);
 287                 au->buf = NULL;
 288         }
 289 }
 290
 291 static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
 292                                    struct ceph_x_ticket_handler *th,
 293                                    struct ceph_x_authorizer *au)
 294 {
 295         int maxlen;
 296         struct ceph_x_authorize_a *msg_a;
 297         struct ceph_x_authorize_b msg_b;
 298         void *p, *end;
 299         int ret;
 300         int ticket_blob_len =
 301                 (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0);
 302
 303         dout("build_authorizer for %s %p\n",
 304              ceph_entity_type_name(th->service), au);
 305
 306         ceph_crypto_key_destroy(&au->session_key);
 307         ret = ceph_crypto_key_clone(&au->session_key, &th->session_key);
 308         if (ret)
 309                 goto out_au;
 310
 311         maxlen = sizeof(*msg_a) + sizeof(msg_b) +
 312                 ceph_x_encrypt_buflen(ticket_blob_len);
 313         dout("  need len %d\n", maxlen);
 314         if (au->buf && au->buf->alloc_len < maxlen) {
 315                 ceph_buffer_put(au->buf);
 316                 au->buf = NULL;
 317         }
 318         if (!au->buf) {
 319                 au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
 320                 if (!au->buf) {
 321                         ret = -ENOMEM;
 322                         goto out_au;
 323                 }
 324         }
 325         au->service = th->service;
 326         au->secret_id = th->secret_id;
 327
 328         msg_a = au->buf->vec.iov_base;
 329         msg_a->struct_v = 1;
 330         msg_a->global_id = cpu_to_le64(ac->global_id);
 331         msg_a->service_id = cpu_to_le32(th->service);
 332         msg_a->ticket_blob.struct_v = 1;
 333         msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
 334         msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
 335         if (ticket_blob_len) {
 336                 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
 337                        th->ticket_blob->vec.iov_len);
 338         }
 339         dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
 340              le64_to_cpu(msg_a->ticket_blob.secret_id));
 341
 342         p = msg_a + 1;
 343         p += ticket_blob_len;
 344         end = au->buf->vec.iov_base + au->buf->vec.iov_len;
 345
 346         get_random_bytes(&au->nonce, sizeof(au->nonce));
 347         msg_b.struct_v = 1;
 348         msg_b.nonce = cpu_to_le64(au->nonce);
 349         ret = ceph_x_encrypt(&au->session_key, &msg_b, sizeof(msg_b),
 350                              p, end - p);
 351         if (ret < 0)
 352                 goto out_au;
 353         p += ret;
 354         au->buf->vec.iov_len = p - au->buf->vec.iov_base;
 355         dout(" built authorizer nonce %llx len %d\n", au->nonce,
 356              (int)au->buf->vec.iov_len);
 357         BUG_ON(au->buf->vec.iov_len > maxlen);
 358         return 0;
 359
 360 out_au:
 361         ceph_x_authorizer_cleanup(au);
 362         return ret;
 363 }
 364
 365 static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
 366                                 void **p, void *end)
 367 {
 368         ceph_decode_need(p, end, 1 + sizeof(u64), bad);
 369         ceph_encode_8(p, 1);
 370         ceph_encode_64(p, th->secret_id);
 371         if (th->ticket_blob) {
 372                 const char *buf = th->ticket_blob->vec.iov_base;
 373                 u32 len = th->ticket_blob->vec.iov_len;
 374
 375                 ceph_encode_32_safe(p, end, len, bad);
 376                 ceph_encode_copy_safe(p, end, buf, len, bad);
 377         } else {
 378                 ceph_encode_32_safe(p, end, 0, bad);
 379         }
 380
 381         return 0;
 382 bad:
 383         return -ERANGE;
 384 }
 385
 386 static bool need_key(struct ceph_x_ticket_handler *th)
 387 {
 388         if (!th->have_key)
 389                 return true;
 390
 391         return get_seconds() >= th->renew_after;
 392 }
 393
 394 static bool have_key(struct ceph_x_ticket_handler *th)
 395 {
 396         if (th->have_key) {
 397                 if (get_seconds() >= th->expires)
 398                         th->have_key = false;
 399         }
 400
 401         return th->have_key;
 402 }
 403
 404 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
 405 {
 406         int want = ac->want_keys;
 407         struct ceph_x_info *xi = ac->private;
 408         int service;
 409
 410         *pneed = ac->want_keys & ~(xi->have_keys);
 411
 412         for (service = 1; service <= want; service <<= 1) {
 413                 struct ceph_x_ticket_handler *th;
 414
 415                 if (!(ac->want_keys & service))
 416                         continue;
 417
 418                 if (*pneed & service)
 419                         continue;
 420
 421                 th = get_ticket_handler(ac, service);
 422                 if (IS_ERR(th)) {
 423                         *pneed |= service;
 424                         continue;
 425                 }
 426
 427                 if (need_key(th))
 428                         *pneed |= service;
 429                 if (!have_key(th))
 430                         xi->have_keys &= ~service;
 431         }
 432 }
 433
 434 static int ceph_x_build_request(struct ceph_auth_client *ac,
 435                                 void *buf, void *end)
 436 {
 437         struct ceph_x_info *xi = ac->private;
 438         int need;
 439         struct ceph_x_request_header *head = buf;
 440         int ret;
 441         struct ceph_x_ticket_handler *th =
 442                 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 443
 444         if (IS_ERR(th))
 445                 return PTR_ERR(th);
 446
 447         ceph_x_validate_tickets(ac, &need);
 448
 449         dout("build_request want %x have %x need %x\n",
 450              ac->want_keys, xi->have_keys, need);
 451
 452         if (need & CEPH_ENTITY_TYPE_AUTH) {
 453                 struct ceph_x_authenticate *auth = (void *)(head + 1);
 454                 void *p = auth + 1;
 455                 struct ceph_x_challenge_blob tmp;
 456                 char tmp_enc[40];
 457                 u64 *u;
 458
 459                 if (p > end)
 460                         return -ERANGE;
 461
 462                 dout(" get_auth_session_key\n");
 463                 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
 464
 465                 /* encrypt and hash */
 466                 get_random_bytes(&auth->client_challenge, sizeof(u64));
 467                 tmp.client_challenge = auth->client_challenge;
 468                 tmp.server_challenge = cpu_to_le64(xi->server_challenge);
 469                 ret = ceph_x_encrypt(&xi->secret, &tmp, sizeof(tmp),
 470                                      tmp_enc, sizeof(tmp_enc));
 471                 if (ret < 0)
 472                         return ret;
 473
 474                 auth->struct_v = 1;
 475                 auth->key = 0;
 476                 for (u = (u64 *)tmp_enc; u + 1 <= (u64 *)(tmp_enc + ret); u++)
 477                         auth->key ^= *(__le64 *)u;
 478                 dout(" server_challenge %llx client_challenge %llx key %llx\n",
 479                      xi->server_challenge, le64_to_cpu(auth->client_challenge),
 480                      le64_to_cpu(auth->key));
 481
 482                 /* now encode the old ticket if exists */
 483                 ret = ceph_x_encode_ticket(th, &p, end);
 484                 if (ret < 0)
 485                         return ret;
 486
 487                 return p - buf;
 488         }
 489
 490         if (need) {
 491                 void *p = head + 1;
 492                 struct ceph_x_service_ticket_request *req;
 493
 494                 if (p > end)
 495                         return -ERANGE;
 496                 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
 497
 498                 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
 499                 if (ret)
 500                         return ret;
 501                 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
 502                                  xi->auth_authorizer.buf->vec.iov_len);
 503
 504                 req = p;
 505                 req->keys = cpu_to_le32(need);
 506                 p += sizeof(*req);
 507                 return p - buf;
 508         }
 509
 510         return 0;
 511 }
 512
 513 static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
 514                                void *buf, void *end)
 515 {
 516         struct ceph_x_info *xi = ac->private;
 517         struct ceph_x_reply_header *head = buf;
 518         struct ceph_x_ticket_handler *th;
 519         int len = end - buf;
 520         int op;
 521         int ret;
 522
 523         if (result)
 524                 return result;  /* XXX hmm? */
 525
 526         if (xi->starting) {
 527                 /* it's a hello */
 528                 struct ceph_x_server_challenge *sc = buf;
 529
 530                 if (len != sizeof(*sc))
 531                         return -EINVAL;
 532                 xi->server_challenge = le64_to_cpu(sc->server_challenge);
 533                 dout("handle_reply got server challenge %llx\n",
 534                      xi->server_challenge);
 535                 xi->starting = false;
 536                 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
 537                 return -EAGAIN;
 538         }
 539
 540         op = le16_to_cpu(head->op);
 541         result = le32_to_cpu(head->result);
 542         dout("handle_reply op %d result %d\n", op, result);
 543         switch (op) {
 544         case CEPHX_GET_AUTH_SESSION_KEY:
 545                 /* verify auth key */
 546                 ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
 547                                                buf + sizeof(*head), end);
 548                 break;
 549
 550         case CEPHX_GET_PRINCIPAL_SESSION_KEY:
 551                 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 552                 if (IS_ERR(th))
 553                         return PTR_ERR(th);
 554                 ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
 555                                                buf + sizeof(*head), end);
 556                 break;
 557
 558         default:
 559                 return -EINVAL;
 560         }
 561         if (ret)
 562                 return ret;
 563         if (ac->want_keys == xi->have_keys)
 564                 return 0;
 565         return -EAGAIN;
 566 }
 567
 568 static int ceph_x_create_authorizer(
 569         struct ceph_auth_client *ac, int peer_type,
 570         struct ceph_auth_handshake *auth)
 571 {
 572         struct ceph_x_authorizer *au;
 573         struct ceph_x_ticket_handler *th;
 574         int ret;
 575
 576         th = get_ticket_handler(ac, peer_type);
 577         if (IS_ERR(th))
 578                 return PTR_ERR(th);
 579
 580         au = kzalloc(sizeof(*au), GFP_NOFS);
 581         if (!au)
 582                 return -ENOMEM;
 583
 584         ret = ceph_x_build_authorizer(ac, th, au);
 585         if (ret) {
 586                 kfree(au);
 587                 return ret;
 588         }
 589
 590         auth->authorizer = (struct ceph_authorizer *) au;
 591         auth->authorizer_buf = au->buf->vec.iov_base;
 592         auth->authorizer_buf_len = au->buf->vec.iov_len;
 593         auth->authorizer_reply_buf = au->reply_buf;
 594         auth->authorizer_reply_buf_len = sizeof (au->reply_buf);
 595         auth->sign_message = ac->ops->sign_message;
 596         auth->check_message_signature = ac->ops->check_message_signature;
 597
 598         return 0;
 599 }
 600
 601 static int ceph_x_update_authorizer(
 602         struct ceph_auth_client *ac, int peer_type,
 603         struct ceph_auth_handshake *auth)
 604 {
 605         struct ceph_x_authorizer *au;
 606         struct ceph_x_ticket_handler *th;
 607
 608         th = get_ticket_handler(ac, peer_type);
 609         if (IS_ERR(th))
 610                 return PTR_ERR(th);
 611
 612         au = (struct ceph_x_authorizer *)auth->authorizer;
 613         if (au->secret_id < th->secret_id) {
 614                 dout("ceph_x_update_authorizer service %u secret %llu < %llu\n",
 615                      au->service, au->secret_id, th->secret_id);
 616                 return ceph_x_build_authorizer(ac, th, au);
 617         }
 618         return 0;
 619 }
 620
 621 static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
 622                                           struct ceph_authorizer *a, size_t len)
 623 {
 624         struct ceph_x_authorizer *au = (void *)a;
 625         int ret = 0;
 626         struct ceph_x_authorize_reply reply;
 627         void *preply = &reply;
 628         void *p = au->reply_buf;
 629         void *end = p + sizeof(au->reply_buf);
 630
 631         ret = ceph_x_decrypt(&au->session_key, &p, end, &preply, sizeof(reply));
 632         if (ret < 0)
 633                 return ret;
 634         if (ret != sizeof(reply))
 635                 return -EPERM;
 636
 637         if (au->nonce + 1 != le64_to_cpu(reply.nonce_plus_one))
 638                 ret = -EPERM;
 639         else
 640                 ret = 0;
 641         dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
 642              au->nonce, le64_to_cpu(reply.nonce_plus_one), ret);
 643         return ret;
 644 }
 645
 646 static void ceph_x_destroy_authorizer(struct ceph_auth_client *ac,
 647                                       struct ceph_authorizer *a)
 648 {
 649         struct ceph_x_authorizer *au = (void *)a;
 650
 651         ceph_x_authorizer_cleanup(au);
 652         kfree(au);
 653 }
 654
 655
 656 static void ceph_x_reset(struct ceph_auth_client *ac)
 657 {
 658         struct ceph_x_info *xi = ac->private;
 659
 660         dout("reset\n");
 661         xi->starting = true;
 662         xi->server_challenge = 0;
 663 }
 664
 665 static void ceph_x_destroy(struct ceph_auth_client *ac)
 666 {
 667         struct ceph_x_info *xi = ac->private;
 668         struct rb_node *p;
 669
 670         dout("ceph_x_destroy %p\n", ac);
 671         ceph_crypto_key_destroy(&xi->secret);
 672
 673         while ((p = rb_first(&xi->ticket_handlers)) != NULL) {
 674                 struct ceph_x_ticket_handler *th =
 675                         rb_entry(p, struct ceph_x_ticket_handler, node);
 676                 remove_ticket_handler(ac, th);
 677         }
 678
 679         ceph_x_authorizer_cleanup(&xi->auth_authorizer);
 680
 681         kfree(ac->private);
 682         ac->private = NULL;
 683 }
 684
 685 static void invalidate_ticket(struct ceph_auth_client *ac, int peer_type)
 686 {
 687         struct ceph_x_ticket_handler *th;
 688
 689         th = get_ticket_handler(ac, peer_type);
 690         if (!IS_ERR(th))
 691                 th->have_key = false;
 692 }
 693
 694 static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
 695                                          int peer_type)
 696 {
 697         /*
 698          * We are to invalidate a service ticket in the hopes of
 699          * getting a new, hopefully more valid, one.  But, we won't get
 700          * it unless our AUTH ticket is good, so invalidate AUTH ticket
 701          * as well, just in case.
 702          */
 703         invalidate_ticket(ac, peer_type);
 704         invalidate_ticket(ac, CEPH_ENTITY_TYPE_AUTH);
 705 }
 706
 707 static int calcu_signature(struct ceph_x_authorizer *au,
 708                            struct ceph_msg *msg, __le64 *sig)
 709 {
 710         int ret;
 711         char tmp_enc[40];
 712         __le32 tmp[5] = {
 713                 cpu_to_le32(16), msg->hdr.crc, msg->footer.front_crc,
 714                 msg->footer.middle_crc, msg->footer.data_crc,
 715         };
 716         ret = ceph_x_encrypt(&au->session_key, &tmp, sizeof(tmp),
 717                              tmp_enc, sizeof(tmp_enc));
 718         if (ret < 0)
 719                 return ret;
 720         *sig = *(__le64*)(tmp_enc + 4);
 721         return 0;
 722 }
 723
 724 static int ceph_x_sign_message(struct ceph_auth_handshake *auth,
 725                                struct ceph_msg *msg)
 726 {
 727         int ret;
 728
 729         if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN))
 730                 return 0;
 731
 732         ret = calcu_signature((struct ceph_x_authorizer *)auth->authorizer,
 733                               msg, &msg->footer.sig);
 734         if (ret < 0)
 735                 return ret;
 736         msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED;
 737         return 0;
 738 }
 739
 740 static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth,
 741                                           struct ceph_msg *msg)
 742 {
 743         __le64 sig_check;
 744         int ret;
 745
 746         if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN))
 747                 return 0;
 748
 749         ret = calcu_signature((struct ceph_x_authorizer *)auth->authorizer,
 750                               msg, &sig_check);
 751         if (ret < 0)
 752                 return ret;
 753         if (sig_check == msg->footer.sig)
 754                 return 0;
 755         if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED)
 756                 dout("ceph_x_check_message_signature %p has signature %llx "
 757                      "expect %llx\n", msg, msg->footer.sig, sig_check);
 758         else
 759                 dout("ceph_x_check_message_signature %p sender did not set "
 760                      "CEPH_MSG_FOOTER_SIGNED\n", msg);
 761         return -EBADMSG;
 762 }
 763
 764 static const struct ceph_auth_client_ops ceph_x_ops = {
 765         .name = "x",
 766         .is_authenticated = ceph_x_is_authenticated,
 767         .should_authenticate = ceph_x_should_authenticate,
 768         .build_request = ceph_x_build_request,
 769         .handle_reply = ceph_x_handle_reply,
 770         .create_authorizer = ceph_x_create_authorizer,
 771         .update_authorizer = ceph_x_update_authorizer,
 772         .verify_authorizer_reply = ceph_x_verify_authorizer_reply,
 773         .destroy_authorizer = ceph_x_destroy_authorizer,
 774         .invalidate_authorizer = ceph_x_invalidate_authorizer,
 775         .reset =  ceph_x_reset,
 776         .destroy = ceph_x_destroy,
 777         .sign_message = ceph_x_sign_message,
 778         .check_message_signature = ceph_x_check_message_signature,
 779 };
 780
 781
 782 int ceph_x_init(struct ceph_auth_client *ac)
 783 {
 784         struct ceph_x_info *xi;
 785         int ret;
 786
 787         dout("ceph_x_init %p\n", ac);
 788         ret = -ENOMEM;
 789         xi = kzalloc(sizeof(*xi), GFP_NOFS);
 790         if (!xi)
 791                 goto out;
 792
 793         ret = -EINVAL;
 794         if (!ac->key) {
 795                 pr_err("no secret set (for auth_x protocol)\n");
 796                 goto out_nomem;
 797         }
 798
 799         ret = ceph_crypto_key_clone(&xi->secret, ac->key);
 800         if (ret < 0) {
 801                 pr_err("cannot clone key: %d\n", ret);
 802                 goto out_nomem;
 803         }
 804
 805         xi->starting = true;
 806         xi->ticket_handlers = RB_ROOT;
 807
 808         ac->protocol = CEPH_AUTH_CEPHX;
 809         ac->private = xi;
 810         ac->ops = &ceph_x_ops;
 811         return 0;
 812
 813 out_nomem:
 814         kfree(xi);
 815 out:
 816         return ret;
 817 }
 818
 819