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