net/ceph/auth_x.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <linux/ceph/ceph_debug.h>
   4
   5 #include <linux/err.h>
   6 #include <linux/module.h>
   7 #include <linux/random.h>
   8 #include <linux/slab.h>
   9
  10 #include <linux/ceph/decode.h>
  11 #include <linux/ceph/auth.h>
  12 #include <linux/ceph/libceph.h>
  13 #include <linux/ceph/messenger.h>
  14
  15 #include "crypto.h"
  16 #include "auth_x.h"
  17 #include "auth_x_protocol.h"
  18
  19 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed);
  20
  21 static int ceph_x_is_authenticated(struct ceph_auth_client *ac)
  22 {
  23         struct ceph_x_info *xi = ac->private;
  24         int need;
  25
  26         ceph_x_validate_tickets(ac, &need);
  27         dout("ceph_x_is_authenticated want=%d need=%d have=%d\n",
  28              ac->want_keys, need, xi->have_keys);
  29         return (ac->want_keys & xi->have_keys) == ac->want_keys;
  30 }
  31
  32 static int ceph_x_should_authenticate(struct ceph_auth_client *ac)
  33 {
  34         struct ceph_x_info *xi = ac->private;
  35         int need;
  36
  37         ceph_x_validate_tickets(ac, &need);
  38         dout("ceph_x_should_authenticate want=%d need=%d have=%d\n",
  39              ac->want_keys, need, xi->have_keys);
  40         return need != 0;
  41 }
  42
  43 static int ceph_x_encrypt_offset(void)
  44 {
  45         return sizeof(u32) + sizeof(struct ceph_x_encrypt_header);
  46 }
  47
  48 static int ceph_x_encrypt_buflen(int ilen)
  49 {
  50         return ceph_x_encrypt_offset() + ilen + 16;
  51 }
  52
  53 static int ceph_x_encrypt(struct ceph_crypto_key *secret, void *buf,
  54                           int buf_len, int plaintext_len)
  55 {
  56         struct ceph_x_encrypt_header *hdr = buf + sizeof(u32);
  57         int ciphertext_len;
  58         int ret;
  59
  60         hdr->struct_v = 1;
  61         hdr->magic = cpu_to_le64(CEPHX_ENC_MAGIC);
  62
  63         ret = ceph_crypt(secret, true, buf + sizeof(u32), buf_len - sizeof(u32),
  64                          plaintext_len + sizeof(struct ceph_x_encrypt_header),
  65                          &ciphertext_len);
  66         if (ret)
  67                 return ret;
  68
  69         ceph_encode_32(&buf, ciphertext_len);
  70         return sizeof(u32) + ciphertext_len;
  71 }
  72
  73 static int ceph_x_decrypt(struct ceph_crypto_key *secret, void **p, void *end)
  74 {
  75         struct ceph_x_encrypt_header *hdr = *p + sizeof(u32);
  76         int ciphertext_len, plaintext_len;
  77         int ret;
  78
  79         ceph_decode_32_safe(p, end, ciphertext_len, e_inval);
  80         ceph_decode_need(p, end, ciphertext_len, e_inval);
  81
  82         ret = ceph_crypt(secret, false, *p, end - *p, ciphertext_len,
  83                          &plaintext_len);
  84         if (ret)
  85                 return ret;
  86
  87         if (hdr->struct_v != 1 || le64_to_cpu(hdr->magic) != CEPHX_ENC_MAGIC)
  88                 return -EPERM;
  89
  90         *p += ciphertext_len;
  91         return plaintext_len - sizeof(struct ceph_x_encrypt_header);
  92
  93 e_inval:
  94         return -EINVAL;
  95 }
  96
  97 /*
  98  * get existing (or insert new) ticket handler
  99  */
 100 static struct ceph_x_ticket_handler *
 101 get_ticket_handler(struct ceph_auth_client *ac, int service)
 102 {
 103         struct ceph_x_ticket_handler *th;
 104         struct ceph_x_info *xi = ac->private;
 105         struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node;
 106
 107         while (*p) {
 108                 parent = *p;
 109                 th = rb_entry(parent, struct ceph_x_ticket_handler, node);
 110                 if (service < th->service)
 111                         p = &(*p)->rb_left;
 112                 else if (service > th->service)
 113                         p = &(*p)->rb_right;
 114                 else
 115                         return th;
 116         }
 117
 118         /* add it */
 119         th = kzalloc(sizeof(*th), GFP_NOFS);
 120         if (!th)
 121                 return ERR_PTR(-ENOMEM);
 122         th->service = service;
 123         rb_link_node(&th->node, parent, p);
 124         rb_insert_color(&th->node, &xi->ticket_handlers);
 125         return th;
 126 }
 127
 128 static void remove_ticket_handler(struct ceph_auth_client *ac,
 129                                   struct ceph_x_ticket_handler *th)
 130 {
 131         struct ceph_x_info *xi = ac->private;
 132
 133         dout("remove_ticket_handler %p %d\n", th, th->service);
 134         rb_erase(&th->node, &xi->ticket_handlers);
 135         ceph_crypto_key_destroy(&th->session_key);
 136         if (th->ticket_blob)
 137                 ceph_buffer_put(th->ticket_blob);
 138         kfree(th);
 139 }
 140
 141 static int process_one_ticket(struct ceph_auth_client *ac,
 142                               struct ceph_crypto_key *secret,
 143                               void **p, void *end)
 144 {
 145         struct ceph_x_info *xi = ac->private;
 146         int type;
 147         u8 tkt_struct_v, blob_struct_v;
 148         struct ceph_x_ticket_handler *th;
 149         void *dp, *dend;
 150         int dlen;
 151         char is_enc;
 152         struct timespec validity;
 153         void *tp, *tpend;
 154         void **ptp;
 155         struct ceph_crypto_key new_session_key = { 0 };
 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         dp = *p + ceph_x_encrypt_offset();
 178         ret = ceph_x_decrypt(secret, p, end);
 179         if (ret < 0)
 180                 goto out;
 181         dout(" decrypted %d bytes\n", ret);
 182         dend = dp + ret;
 183
 184         tkt_struct_v = ceph_decode_8(&dp);
 185         if (tkt_struct_v != 1)
 186                 goto bad;
 187
 188         ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
 189         if (ret)
 190                 goto out;
 191
 192         ceph_decode_timespec(&validity, dp);
 193         dp += sizeof(struct ceph_timespec);
 194         new_expires = get_seconds() + validity.tv_sec;
 195         new_renew_after = new_expires - (validity.tv_sec / 4);
 196         dout(" expires=%lu renew_after=%lu\n", new_expires,
 197              new_renew_after);
 198
 199         /* ticket blob for service */
 200         ceph_decode_8_safe(p, end, is_enc, bad);
 201         if (is_enc) {
 202                 /* encrypted */
 203                 tp = *p + ceph_x_encrypt_offset();
 204                 ret = ceph_x_decrypt(&th->session_key, p, end);
 205                 if (ret < 0)
 206                         goto out;
 207                 dout(" encrypted ticket, decrypted %d bytes\n", ret);
 208                 ptp = &tp;
 209                 tpend = tp + ret;
 210         } else {
 211                 /* unencrypted */
 212                 ptp = p;
 213                 tpend = end;
 214         }
 215         ceph_decode_32_safe(ptp, tpend, dlen, bad);
 216         dout(" ticket blob is %d bytes\n", dlen);
 217         ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad);
 218         blob_struct_v = ceph_decode_8(ptp);
 219         if (blob_struct_v != 1)
 220                 goto bad;
 221
 222         new_secret_id = ceph_decode_64(ptp);
 223         ret = ceph_decode_buffer(&new_ticket_blob, ptp, tpend);
 224         if (ret)
 225                 goto out;
 226
 227         /* all is well, update our ticket */
 228         ceph_crypto_key_destroy(&th->session_key);
 229         if (th->ticket_blob)
 230                 ceph_buffer_put(th->ticket_blob);
 231         th->session_key = new_session_key;
 232         th->ticket_blob = new_ticket_blob;
 233         th->secret_id = new_secret_id;
 234         th->expires = new_expires;
 235         th->renew_after = new_renew_after;
 236         th->have_key = true;
 237         dout(" got ticket service %d (%s) secret_id %lld len %d\n",
 238              type, ceph_entity_type_name(type), th->secret_id,
 239              (int)th->ticket_blob->vec.iov_len);
 240         xi->have_keys |= th->service;
 241         return 0;
 242
 243 bad:
 244         ret = -EINVAL;
 245 out:
 246         ceph_crypto_key_destroy(&new_session_key);
 247         return ret;
 248 }
 249
 250 static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
 251                                     struct ceph_crypto_key *secret,
 252                                     void *buf, void *end)
 253 {
 254         void *p = buf;
 255         u8 reply_struct_v;
 256         u32 num;
 257         int ret;
 258
 259         ceph_decode_8_safe(&p, end, reply_struct_v, bad);
 260         if (reply_struct_v != 1)
 261                 return -EINVAL;
 262
 263         ceph_decode_32_safe(&p, end, num, bad);
 264         dout("%d tickets\n", num);
 265
 266         while (num--) {
 267                 ret = process_one_ticket(ac, secret, &p, end);
 268                 if (ret)
 269                         return ret;
 270         }
 271
 272         return 0;
 273
 274 bad:
 275         return -EINVAL;
 276 }
 277
 278 static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au)
 279 {
 280         ceph_crypto_key_destroy(&au->session_key);
 281         if (au->buf) {
 282                 ceph_buffer_put(au->buf);
 283                 au->buf = NULL;
 284         }
 285 }
 286
 287 static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
 288                                    struct ceph_x_ticket_handler *th,
 289                                    struct ceph_x_authorizer *au)
 290 {
 291         int maxlen;
 292         struct ceph_x_authorize_a *msg_a;
 293         struct ceph_x_authorize_b *msg_b;
 294         void *p, *end;
 295         int ret;
 296         int ticket_blob_len =
 297                 (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0);
 298
 299         dout("build_authorizer for %s %p\n",
 300              ceph_entity_type_name(th->service), au);
 301
 302         ceph_crypto_key_destroy(&au->session_key);
 303         ret = ceph_crypto_key_clone(&au->session_key, &th->session_key);
 304         if (ret)
 305                 goto out_au;
 306
 307         maxlen = sizeof(*msg_a) + ticket_blob_len +
 308                 ceph_x_encrypt_buflen(sizeof(*msg_b));
 309         dout("  need len %d\n", maxlen);
 310         if (au->buf && au->buf->alloc_len < maxlen) {
 311                 ceph_buffer_put(au->buf);
 312                 au->buf = NULL;
 313         }
 314         if (!au->buf) {
 315                 au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
 316                 if (!au->buf) {
 317                         ret = -ENOMEM;
 318                         goto out_au;
 319                 }
 320         }
 321         au->service = th->service;
 322         au->secret_id = th->secret_id;
 323
 324         msg_a = au->buf->vec.iov_base;
 325         msg_a->struct_v = 1;
 326         msg_a->global_id = cpu_to_le64(ac->global_id);
 327         msg_a->service_id = cpu_to_le32(th->service);
 328         msg_a->ticket_blob.struct_v = 1;
 329         msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
 330         msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
 331         if (ticket_blob_len) {
 332                 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
 333                        th->ticket_blob->vec.iov_len);
 334         }
 335         dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
 336              le64_to_cpu(msg_a->ticket_blob.secret_id));
 337
 338         p = msg_a + 1;
 339         p += ticket_blob_len;
 340         end = au->buf->vec.iov_base + au->buf->vec.iov_len;
 341
 342         msg_b = p + ceph_x_encrypt_offset();
 343         msg_b->struct_v = 1;
 344         get_random_bytes(&au->nonce, sizeof(au->nonce));
 345         msg_b->nonce = cpu_to_le64(au->nonce);
 346         ret = ceph_x_encrypt(&au->session_key, p, end - p, sizeof(*msg_b));
 347         if (ret < 0)
 348                 goto out_au;
 349
 350         p += ret;
 351         WARN_ON(p > end);
 352         au->buf->vec.iov_len = p - au->buf->vec.iov_base;
 353         dout(" built authorizer nonce %llx len %d\n", au->nonce,
 354              (int)au->buf->vec.iov_len);
 355         return 0;
 356
 357 out_au:
 358         ceph_x_authorizer_cleanup(au);
 359         return ret;
 360 }
 361
 362 static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
 363                                 void **p, void *end)
 364 {
 365         ceph_decode_need(p, end, 1 + sizeof(u64), bad);
 366         ceph_encode_8(p, 1);
 367         ceph_encode_64(p, th->secret_id);
 368         if (th->ticket_blob) {
 369                 const char *buf = th->ticket_blob->vec.iov_base;
 370                 u32 len = th->ticket_blob->vec.iov_len;
 371
 372                 ceph_encode_32_safe(p, end, len, bad);
 373                 ceph_encode_copy_safe(p, end, buf, len, bad);
 374         } else {
 375                 ceph_encode_32_safe(p, end, 0, bad);
 376         }
 377
 378         return 0;
 379 bad:
 380         return -ERANGE;
 381 }
 382
 383 static bool need_key(struct ceph_x_ticket_handler *th)
 384 {
 385         if (!th->have_key)
 386                 return true;
 387
 388         return get_seconds() >= th->renew_after;
 389 }
 390
 391 static bool have_key(struct ceph_x_ticket_handler *th)
 392 {
 393         if (th->have_key) {
 394                 if (get_seconds() >= th->expires)
 395                         th->have_key = false;
 396         }
 397
 398         return th->have_key;
 399 }
 400
 401 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
 402 {
 403         int want = ac->want_keys;
 404         struct ceph_x_info *xi = ac->private;
 405         int service;
 406
 407         *pneed = ac->want_keys & ~(xi->have_keys);
 408
 409         for (service = 1; service <= want; service <<= 1) {
 410                 struct ceph_x_ticket_handler *th;
 411
 412                 if (!(ac->want_keys & service))
 413                         continue;
 414
 415                 if (*pneed & service)
 416                         continue;
 417
 418                 th = get_ticket_handler(ac, service);
 419                 if (IS_ERR(th)) {
 420                         *pneed |= service;
 421                         continue;
 422                 }
 423
 424                 if (need_key(th))
 425                         *pneed |= service;
 426                 if (!have_key(th))
 427                         xi->have_keys &= ~service;
 428         }
 429 }
 430
 431 static int ceph_x_build_request(struct ceph_auth_client *ac,
 432                                 void *buf, void *end)
 433 {
 434         struct ceph_x_info *xi = ac->private;
 435         int need;
 436         struct ceph_x_request_header *head = buf;
 437         int ret;
 438         struct ceph_x_ticket_handler *th =
 439                 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 440
 441         if (IS_ERR(th))
 442                 return PTR_ERR(th);
 443
 444         ceph_x_validate_tickets(ac, &need);
 445
 446         dout("build_request want %x have %x need %x\n",
 447              ac->want_keys, xi->have_keys, need);
 448
 449         if (need & CEPH_ENTITY_TYPE_AUTH) {
 450                 struct ceph_x_authenticate *auth = (void *)(head + 1);
 451                 void *p = auth + 1;
 452                 void *enc_buf = xi->auth_authorizer.enc_buf;
 453                 struct ceph_x_challenge_blob *blob = enc_buf +
 454                                                         ceph_x_encrypt_offset();
 455                 u64 *u;
 456
 457                 if (p > end)
 458                         return -ERANGE;
 459
 460                 dout(" get_auth_session_key\n");
 461                 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
 462
 463                 /* encrypt and hash */
 464                 get_random_bytes(&auth->client_challenge, sizeof(u64));
 465                 blob->client_challenge = auth->client_challenge;
 466                 blob->server_challenge = cpu_to_le64(xi->server_challenge);
 467                 ret = ceph_x_encrypt(&xi->secret, enc_buf, CEPHX_AU_ENC_BUF_LEN,
 468                                      sizeof(*blob));
 469                 if (ret < 0)
 470                         return ret;
 471
 472                 auth->struct_v = 1;
 473                 auth->key = 0;
 474                 for (u = (u64 *)enc_buf; u + 1 <= (u64 *)(enc_buf + ret); u++)
 475                         auth->key ^= *(__le64 *)u;
 476                 dout(" server_challenge %llx client_challenge %llx key %llx\n",
 477                      xi->server_challenge, le64_to_cpu(auth->client_challenge),
 478                      le64_to_cpu(auth->key));
 479
 480                 /* now encode the old ticket if exists */
 481                 ret = ceph_x_encode_ticket(th, &p, end);
 482                 if (ret < 0)
 483                         return ret;
 484
 485                 return p - buf;
 486         }
 487
 488         if (need) {
 489                 void *p = head + 1;
 490                 struct ceph_x_service_ticket_request *req;
 491
 492                 if (p > end)
 493                         return -ERANGE;
 494                 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
 495
 496                 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
 497                 if (ret)
 498                         return ret;
 499                 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
 500                                  xi->auth_authorizer.buf->vec.iov_len);
 501
 502                 req = p;
 503                 req->keys = cpu_to_le32(need);
 504                 p += sizeof(*req);
 505                 return p - buf;
 506         }
 507
 508         return 0;
 509 }
 510
 511 static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
 512                                void *buf, void *end)
 513 {
 514         struct ceph_x_info *xi = ac->private;
 515         struct ceph_x_reply_header *head = buf;
 516         struct ceph_x_ticket_handler *th;
 517         int len = end - buf;
 518         int op;
 519         int ret;
 520
 521         if (result)
 522                 return result;  /* XXX hmm? */
 523
 524         if (xi->starting) {
 525                 /* it's a hello */
 526                 struct ceph_x_server_challenge *sc = buf;
 527
 528                 if (len != sizeof(*sc))
 529                         return -EINVAL;
 530                 xi->server_challenge = le64_to_cpu(sc->server_challenge);
 531                 dout("handle_reply got server challenge %llx\n",
 532                      xi->server_challenge);
 533                 xi->starting = false;
 534                 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
 535                 return -EAGAIN;
 536         }
 537
 538         op = le16_to_cpu(head->op);
 539         result = le32_to_cpu(head->result);
 540         dout("handle_reply op %d result %d\n", op, result);
 541         switch (op) {
 542         case CEPHX_GET_AUTH_SESSION_KEY:
 543                 /* verify auth key */
 544                 ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
 545                                                buf + sizeof(*head), end);
 546                 break;
 547
 548         case CEPHX_GET_PRINCIPAL_SESSION_KEY:
 549                 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 550                 if (IS_ERR(th))
 551                         return PTR_ERR(th);
 552                 ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
 553                                                buf + sizeof(*head), end);
 554                 break;
 555
 556         default:
 557                 return -EINVAL;
 558         }
 559         if (ret)
 560                 return ret;
 561         if (ac->want_keys == xi->have_keys)
 562                 return 0;
 563         return -EAGAIN;
 564 }
 565
 566 static void ceph_x_destroy_authorizer(struct ceph_authorizer *a)
 567 {
 568         struct ceph_x_authorizer *au = (void *)a;
 569
 570         ceph_x_authorizer_cleanup(au);
 571         kfree(au);
 572 }
 573
 574 static int ceph_x_create_authorizer(
 575         struct ceph_auth_client *ac, int peer_type,
 576         struct ceph_auth_handshake *auth)
 577 {
 578         struct ceph_x_authorizer *au;
 579         struct ceph_x_ticket_handler *th;
 580         int ret;
 581
 582         th = get_ticket_handler(ac, peer_type);
 583         if (IS_ERR(th))
 584                 return PTR_ERR(th);
 585
 586         au = kzalloc(sizeof(*au), GFP_NOFS);
 587         if (!au)
 588                 return -ENOMEM;
 589
 590         au->base.destroy = ceph_x_destroy_authorizer;
 591
 592         ret = ceph_x_build_authorizer(ac, th, au);
 593         if (ret) {
 594                 kfree(au);
 595                 return ret;
 596         }
 597
 598         auth->authorizer = (struct ceph_authorizer *) au;
 599         auth->authorizer_buf = au->buf->vec.iov_base;
 600         auth->authorizer_buf_len = au->buf->vec.iov_len;
 601         auth->authorizer_reply_buf = au->enc_buf;
 602         auth->authorizer_reply_buf_len = CEPHX_AU_ENC_BUF_LEN;
 603         auth->sign_message = ac->ops->sign_message;
 604         auth->check_message_signature = ac->ops->check_message_signature;
 605
 606         return 0;
 607 }
 608
 609 static int ceph_x_update_authorizer(
 610         struct ceph_auth_client *ac, int peer_type,
 611         struct ceph_auth_handshake *auth)
 612 {
 613         struct ceph_x_authorizer *au;
 614         struct ceph_x_ticket_handler *th;
 615
 616         th = get_ticket_handler(ac, peer_type);
 617         if (IS_ERR(th))
 618                 return PTR_ERR(th);
 619
 620         au = (struct ceph_x_authorizer *)auth->authorizer;
 621         if (au->secret_id < th->secret_id) {
 622                 dout("ceph_x_update_authorizer service %u secret %llu < %llu\n",
 623                      au->service, au->secret_id, th->secret_id);
 624                 return ceph_x_build_authorizer(ac, th, au);
 625         }
 626         return 0;
 627 }
 628
 629 static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
 630                                           struct ceph_authorizer *a)
 631 {
 632         struct ceph_x_authorizer *au = (void *)a;
 633         void *p = au->enc_buf;
 634         struct ceph_x_authorize_reply *reply = p + ceph_x_encrypt_offset();
 635         int ret;
 636
 637         ret = ceph_x_decrypt(&au->session_key, &p, p + CEPHX_AU_ENC_BUF_LEN);
 638         if (ret < 0)
 639                 return ret;
 640         if (ret != sizeof(*reply))
 641                 return -EPERM;
 642
 643         if (au->nonce + 1 != le64_to_cpu(reply->nonce_plus_one))
 644                 ret = -EPERM;
 645         else
 646                 ret = 0;
 647         dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
 648              au->nonce, le64_to_cpu(reply->nonce_plus_one), ret);
 649         return ret;
 650 }
 651
 652 static void ceph_x_reset(struct ceph_auth_client *ac)
 653 {
 654         struct ceph_x_info *xi = ac->private;
 655
 656         dout("reset\n");
 657         xi->starting = true;
 658         xi->server_challenge = 0;
 659 }
 660
 661 static void ceph_x_destroy(struct ceph_auth_client *ac)
 662 {
 663         struct ceph_x_info *xi = ac->private;
 664         struct rb_node *p;
 665
 666         dout("ceph_x_destroy %p\n", ac);
 667         ceph_crypto_key_destroy(&xi->secret);
 668
 669         while ((p = rb_first(&xi->ticket_handlers)) != NULL) {
 670                 struct ceph_x_ticket_handler *th =
 671                         rb_entry(p, struct ceph_x_ticket_handler, node);
 672                 remove_ticket_handler(ac, th);
 673         }
 674
 675         ceph_x_authorizer_cleanup(&xi->auth_authorizer);
 676
 677         kfree(ac->private);
 678         ac->private = NULL;
 679 }
 680
 681 static void invalidate_ticket(struct ceph_auth_client *ac, int peer_type)
 682 {
 683         struct ceph_x_ticket_handler *th;
 684
 685         th = get_ticket_handler(ac, peer_type);
 686         if (!IS_ERR(th))
 687                 th->have_key = false;
 688 }
 689
 690 static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
 691                                          int peer_type)
 692 {
 693         /*
 694          * We are to invalidate a service ticket in the hopes of
 695          * getting a new, hopefully more valid, one.  But, we won't get
 696          * it unless our AUTH ticket is good, so invalidate AUTH ticket
 697          * as well, just in case.
 698          */
 699         invalidate_ticket(ac, peer_type);
 700         invalidate_ticket(ac, CEPH_ENTITY_TYPE_AUTH);
 701 }
 702
 703 static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg,
 704                           __le64 *psig)
 705 {
 706         void *enc_buf = au->enc_buf;
 707         struct {
 708                 __le32 len;
 709                 __le32 header_crc;
 710                 __le32 front_crc;
 711                 __le32 middle_crc;
 712                 __le32 data_crc;
 713         } __packed *sigblock = enc_buf + ceph_x_encrypt_offset();
 714         int ret;
 715
 716         sigblock->len = cpu_to_le32(4*sizeof(u32));
 717         sigblock->header_crc = msg->hdr.crc;
 718         sigblock->front_crc = msg->footer.front_crc;
 719         sigblock->middle_crc = msg->footer.middle_crc;
 720         sigblock->data_crc =  msg->footer.data_crc;
 721         ret = ceph_x_encrypt(&au->session_key, enc_buf, CEPHX_AU_ENC_BUF_LEN,
 722                              sizeof(*sigblock));
 723         if (ret < 0)
 724                 return ret;
 725
 726         *psig = *(__le64 *)(enc_buf + sizeof(u32));
 727         return 0;
 728 }
 729
 730 static int ceph_x_sign_message(struct ceph_auth_handshake *auth,
 731                                struct ceph_msg *msg)
 732 {
 733         __le64 sig;
 734         int ret;
 735
 736         if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN))
 737                 return 0;
 738
 739         ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer,
 740                              msg, &sig);
 741         if (ret)
 742                 return ret;
 743
 744         msg->footer.sig = sig;
 745         msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED;
 746         return 0;
 747 }
 748
 749 static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth,
 750                                           struct ceph_msg *msg)
 751 {
 752         __le64 sig_check;
 753         int ret;
 754
 755         if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN))
 756                 return 0;
 757
 758         ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer,
 759                              msg, &sig_check);
 760         if (ret)
 761                 return ret;
 762         if (sig_check == msg->footer.sig)
 763                 return 0;
 764         if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED)
 765                 dout("ceph_x_check_message_signature %p has signature %llx "
 766                      "expect %llx\n", msg, msg->footer.sig, sig_check);
 767         else
 768                 dout("ceph_x_check_message_signature %p sender did not set "
 769                      "CEPH_MSG_FOOTER_SIGNED\n", msg);
 770         return -EBADMSG;
 771 }
 772
 773 static const struct ceph_auth_client_ops ceph_x_ops = {
 774         .name = "x",
 775         .is_authenticated = ceph_x_is_authenticated,
 776         .should_authenticate = ceph_x_should_authenticate,
 777         .build_request = ceph_x_build_request,
 778         .handle_reply = ceph_x_handle_reply,
 779         .create_authorizer = ceph_x_create_authorizer,
 780         .update_authorizer = ceph_x_update_authorizer,
 781         .verify_authorizer_reply = ceph_x_verify_authorizer_reply,
 782         .invalidate_authorizer = ceph_x_invalidate_authorizer,
 783         .reset =  ceph_x_reset,
 784         .destroy = ceph_x_destroy,
 785         .sign_message = ceph_x_sign_message,
 786         .check_message_signature = ceph_x_check_message_signature,
 787 };
 788
 789
 790 int ceph_x_init(struct ceph_auth_client *ac)
 791 {
 792         struct ceph_x_info *xi;
 793         int ret;
 794
 795         dout("ceph_x_init %p\n", ac);
 796         ret = -ENOMEM;
 797         xi = kzalloc(sizeof(*xi), GFP_NOFS);
 798         if (!xi)
 799                 goto out;
 800
 801         ret = -EINVAL;
 802         if (!ac->key) {
 803                 pr_err("no secret set (for auth_x protocol)\n");
 804                 goto out_nomem;
 805         }
 806
 807         ret = ceph_crypto_key_clone(&xi->secret, ac->key);
 808         if (ret < 0) {
 809                 pr_err("cannot clone key: %d\n", ret);
 810                 goto out_nomem;
 811         }
 812
 813         xi->starting = true;
 814         xi->ticket_handlers = RB_ROOT;
 815
 816         ac->protocol = CEPH_AUTH_CEPHX;
 817         ac->private = xi;
 818         ac->ops = &ceph_x_ops;
 819         return 0;
 820
 821 out_nomem:
 822         kfree(xi);
 823 out:
 824         return ret;
 825 }
 826
 827