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/ceph_features.h>
  13 #include <linux/ceph/libceph.h>
  14 #include <linux/ceph/messenger.h>
  15
  16 #include "crypto.h"
  17 #include "auth_x.h"
  18 #include "auth_x_protocol.h"
  19
  20 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed);
  21
  22 static int ceph_x_is_authenticated(struct ceph_auth_client *ac)
  23 {
  24         struct ceph_x_info *xi = ac->private;
  25         int need;
  26
  27         ceph_x_validate_tickets(ac, &need);
  28         dout("ceph_x_is_authenticated want=%d need=%d have=%d\n",
  29              ac->want_keys, need, xi->have_keys);
  30         return (ac->want_keys & xi->have_keys) == ac->want_keys;
  31 }
  32
  33 static int ceph_x_should_authenticate(struct ceph_auth_client *ac)
  34 {
  35         struct ceph_x_info *xi = ac->private;
  36         int need;
  37
  38         ceph_x_validate_tickets(ac, &need);
  39         dout("ceph_x_should_authenticate want=%d need=%d have=%d\n",
  40              ac->want_keys, need, xi->have_keys);
  41         return need != 0;
  42 }
  43
  44 static int ceph_x_encrypt_offset(void)
  45 {
  46         return sizeof(u32) + sizeof(struct ceph_x_encrypt_header);
  47 }
  48
  49 static int ceph_x_encrypt_buflen(int ilen)
  50 {
  51         return ceph_x_encrypt_offset() + ilen + 16;
  52 }
  53
  54 static int ceph_x_encrypt(struct ceph_crypto_key *secret, void *buf,
  55                           int buf_len, int plaintext_len)
  56 {
  57         struct ceph_x_encrypt_header *hdr = buf + sizeof(u32);
  58         int ciphertext_len;
  59         int ret;
  60
  61         hdr->struct_v = 1;
  62         hdr->magic = cpu_to_le64(CEPHX_ENC_MAGIC);
  63
  64         ret = ceph_crypt(secret, true, buf + sizeof(u32), buf_len - sizeof(u32),
  65                          plaintext_len + sizeof(struct ceph_x_encrypt_header),
  66                          &ciphertext_len);
  67         if (ret)
  68                 return ret;
  69
  70         ceph_encode_32(&buf, ciphertext_len);
  71         return sizeof(u32) + ciphertext_len;
  72 }
  73
  74 static int __ceph_x_decrypt(struct ceph_crypto_key *secret, void *p,
  75                             int ciphertext_len)
  76 {
  77         struct ceph_x_encrypt_header *hdr = p;
  78         int plaintext_len;
  79         int ret;
  80
  81         ret = ceph_crypt(secret, false, p, ciphertext_len, ciphertext_len,
  82                          &plaintext_len);
  83         if (ret)
  84                 return ret;
  85
  86         if (le64_to_cpu(hdr->magic) != CEPHX_ENC_MAGIC) {
  87                 pr_err("%s bad magic\n", __func__);
  88                 return -EINVAL;
  89         }
  90
  91         return plaintext_len - sizeof(*hdr);
  92 }
  93
  94 static int ceph_x_decrypt(struct ceph_crypto_key *secret, void **p, void *end)
  95 {
  96         int ciphertext_len;
  97         int ret;
  98
  99         ceph_decode_32_safe(p, end, ciphertext_len, e_inval);
 100         ceph_decode_need(p, end, ciphertext_len, e_inval);
 101
 102         ret = __ceph_x_decrypt(secret, *p, ciphertext_len);
 103         if (ret < 0)
 104                 return ret;
 105
 106         *p += ciphertext_len;
 107         return ret;
 108
 109 e_inval:
 110         return -EINVAL;
 111 }
 112
 113 /*
 114  * get existing (or insert new) ticket handler
 115  */
 116 static struct ceph_x_ticket_handler *
 117 get_ticket_handler(struct ceph_auth_client *ac, int service)
 118 {
 119         struct ceph_x_ticket_handler *th;
 120         struct ceph_x_info *xi = ac->private;
 121         struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node;
 122
 123         while (*p) {
 124                 parent = *p;
 125                 th = rb_entry(parent, struct ceph_x_ticket_handler, node);
 126                 if (service < th->service)
 127                         p = &(*p)->rb_left;
 128                 else if (service > th->service)
 129                         p = &(*p)->rb_right;
 130                 else
 131                         return th;
 132         }
 133
 134         /* add it */
 135         th = kzalloc(sizeof(*th), GFP_NOFS);
 136         if (!th)
 137                 return ERR_PTR(-ENOMEM);
 138         th->service = service;
 139         rb_link_node(&th->node, parent, p);
 140         rb_insert_color(&th->node, &xi->ticket_handlers);
 141         return th;
 142 }
 143
 144 static void remove_ticket_handler(struct ceph_auth_client *ac,
 145                                   struct ceph_x_ticket_handler *th)
 146 {
 147         struct ceph_x_info *xi = ac->private;
 148
 149         dout("remove_ticket_handler %p %d\n", th, th->service);
 150         rb_erase(&th->node, &xi->ticket_handlers);
 151         ceph_crypto_key_destroy(&th->session_key);
 152         if (th->ticket_blob)
 153                 ceph_buffer_put(th->ticket_blob);
 154         kfree(th);
 155 }
 156
 157 static int process_one_ticket(struct ceph_auth_client *ac,
 158                               struct ceph_crypto_key *secret,
 159                               void **p, void *end)
 160 {
 161         struct ceph_x_info *xi = ac->private;
 162         int type;
 163         u8 tkt_struct_v, blob_struct_v;
 164         struct ceph_x_ticket_handler *th;
 165         void *dp, *dend;
 166         int dlen;
 167         char is_enc;
 168         struct timespec64 validity;
 169         void *tp, *tpend;
 170         void **ptp;
 171         struct ceph_crypto_key new_session_key = { 0 };
 172         struct ceph_buffer *new_ticket_blob;
 173         time64_t new_expires, new_renew_after;
 174         u64 new_secret_id;
 175         int ret;
 176
 177         ceph_decode_need(p, end, sizeof(u32) + 1, bad);
 178
 179         type = ceph_decode_32(p);
 180         dout(" ticket type %d %s\n", type, ceph_entity_type_name(type));
 181
 182         tkt_struct_v = ceph_decode_8(p);
 183         if (tkt_struct_v != 1)
 184                 goto bad;
 185
 186         th = get_ticket_handler(ac, type);
 187         if (IS_ERR(th)) {
 188                 ret = PTR_ERR(th);
 189                 goto out;
 190         }
 191
 192         /* blob for me */
 193         dp = *p + ceph_x_encrypt_offset();
 194         ret = ceph_x_decrypt(secret, p, end);
 195         if (ret < 0)
 196                 goto out;
 197         dout(" decrypted %d bytes\n", ret);
 198         dend = dp + ret;
 199
 200         tkt_struct_v = ceph_decode_8(&dp);
 201         if (tkt_struct_v != 1)
 202                 goto bad;
 203
 204         ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
 205         if (ret)
 206                 goto out;
 207
 208         ceph_decode_timespec64(&validity, dp);
 209         dp += sizeof(struct ceph_timespec);
 210         new_expires = ktime_get_real_seconds() + validity.tv_sec;
 211         new_renew_after = new_expires - (validity.tv_sec / 4);
 212         dout(" expires=%llu renew_after=%llu\n", new_expires,
 213              new_renew_after);
 214
 215         /* ticket blob for service */
 216         ceph_decode_8_safe(p, end, is_enc, bad);
 217         if (is_enc) {
 218                 /* encrypted */
 219                 tp = *p + ceph_x_encrypt_offset();
 220                 ret = ceph_x_decrypt(&th->session_key, p, end);
 221                 if (ret < 0)
 222                         goto out;
 223                 dout(" encrypted ticket, decrypted %d bytes\n", ret);
 224                 ptp = &tp;
 225                 tpend = tp + ret;
 226         } else {
 227                 /* unencrypted */
 228                 ptp = p;
 229                 tpend = end;
 230         }
 231         ceph_decode_32_safe(ptp, tpend, dlen, bad);
 232         dout(" ticket blob is %d bytes\n", dlen);
 233         ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad);
 234         blob_struct_v = ceph_decode_8(ptp);
 235         if (blob_struct_v != 1)
 236                 goto bad;
 237
 238         new_secret_id = ceph_decode_64(ptp);
 239         ret = ceph_decode_buffer(&new_ticket_blob, ptp, tpend);
 240         if (ret)
 241                 goto out;
 242
 243         /* all is well, update our ticket */
 244         ceph_crypto_key_destroy(&th->session_key);
 245         if (th->ticket_blob)
 246                 ceph_buffer_put(th->ticket_blob);
 247         th->session_key = new_session_key;
 248         th->ticket_blob = new_ticket_blob;
 249         th->secret_id = new_secret_id;
 250         th->expires = new_expires;
 251         th->renew_after = new_renew_after;
 252         th->have_key = true;
 253         dout(" got ticket service %d (%s) secret_id %lld len %d\n",
 254              type, ceph_entity_type_name(type), th->secret_id,
 255              (int)th->ticket_blob->vec.iov_len);
 256         xi->have_keys |= th->service;
 257         return 0;
 258
 259 bad:
 260         ret = -EINVAL;
 261 out:
 262         ceph_crypto_key_destroy(&new_session_key);
 263         return ret;
 264 }
 265
 266 static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
 267                                     struct ceph_crypto_key *secret,
 268                                     void *buf, void *end)
 269 {
 270         void *p = buf;
 271         u8 reply_struct_v;
 272         u32 num;
 273         int ret;
 274
 275         ceph_decode_8_safe(&p, end, reply_struct_v, bad);
 276         if (reply_struct_v != 1)
 277                 return -EINVAL;
 278
 279         ceph_decode_32_safe(&p, end, num, bad);
 280         dout("%d tickets\n", num);
 281
 282         while (num--) {
 283                 ret = process_one_ticket(ac, secret, &p, end);
 284                 if (ret)
 285                         return ret;
 286         }
 287
 288         return 0;
 289
 290 bad:
 291         return -EINVAL;
 292 }
 293
 294 /*
 295  * Encode and encrypt the second part (ceph_x_authorize_b) of the
 296  * authorizer.  The first part (ceph_x_authorize_a) should already be
 297  * encoded.
 298  */
 299 static int encrypt_authorizer(struct ceph_x_authorizer *au,
 300                               u64 *server_challenge)
 301 {
 302         struct ceph_x_authorize_a *msg_a;
 303         struct ceph_x_authorize_b *msg_b;
 304         void *p, *end;
 305         int ret;
 306
 307         msg_a = au->buf->vec.iov_base;
 308         WARN_ON(msg_a->ticket_blob.secret_id != cpu_to_le64(au->secret_id));
 309         p = (void *)(msg_a + 1) + le32_to_cpu(msg_a->ticket_blob.blob_len);
 310         end = au->buf->vec.iov_base + au->buf->vec.iov_len;
 311
 312         msg_b = p + ceph_x_encrypt_offset();
 313         msg_b->struct_v = 2;
 314         msg_b->nonce = cpu_to_le64(au->nonce);
 315         if (server_challenge) {
 316                 msg_b->have_challenge = 1;
 317                 msg_b->server_challenge_plus_one =
 318                     cpu_to_le64(*server_challenge + 1);
 319         } else {
 320                 msg_b->have_challenge = 0;
 321                 msg_b->server_challenge_plus_one = 0;
 322         }
 323
 324         ret = ceph_x_encrypt(&au->session_key, p, end - p, sizeof(*msg_b));
 325         if (ret < 0)
 326                 return ret;
 327
 328         p += ret;
 329         if (server_challenge) {
 330                 WARN_ON(p != end);
 331         } else {
 332                 WARN_ON(p > end);
 333                 au->buf->vec.iov_len = p - au->buf->vec.iov_base;
 334         }
 335
 336         return 0;
 337 }
 338
 339 static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au)
 340 {
 341         ceph_crypto_key_destroy(&au->session_key);
 342         if (au->buf) {
 343                 ceph_buffer_put(au->buf);
 344                 au->buf = NULL;
 345         }
 346 }
 347
 348 static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
 349                                    struct ceph_x_ticket_handler *th,
 350                                    struct ceph_x_authorizer *au)
 351 {
 352         int maxlen;
 353         struct ceph_x_authorize_a *msg_a;
 354         struct ceph_x_authorize_b *msg_b;
 355         int ret;
 356         int ticket_blob_len =
 357                 (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0);
 358
 359         dout("build_authorizer for %s %p\n",
 360              ceph_entity_type_name(th->service), au);
 361
 362         ceph_crypto_key_destroy(&au->session_key);
 363         ret = ceph_crypto_key_clone(&au->session_key, &th->session_key);
 364         if (ret)
 365                 goto out_au;
 366
 367         maxlen = sizeof(*msg_a) + ticket_blob_len +
 368                 ceph_x_encrypt_buflen(sizeof(*msg_b));
 369         dout("  need len %d\n", maxlen);
 370         if (au->buf && au->buf->alloc_len < maxlen) {
 371                 ceph_buffer_put(au->buf);
 372                 au->buf = NULL;
 373         }
 374         if (!au->buf) {
 375                 au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
 376                 if (!au->buf) {
 377                         ret = -ENOMEM;
 378                         goto out_au;
 379                 }
 380         }
 381         au->service = th->service;
 382         au->secret_id = th->secret_id;
 383
 384         msg_a = au->buf->vec.iov_base;
 385         msg_a->struct_v = 1;
 386         msg_a->global_id = cpu_to_le64(ac->global_id);
 387         msg_a->service_id = cpu_to_le32(th->service);
 388         msg_a->ticket_blob.struct_v = 1;
 389         msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
 390         msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
 391         if (ticket_blob_len) {
 392                 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
 393                        th->ticket_blob->vec.iov_len);
 394         }
 395         dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
 396              le64_to_cpu(msg_a->ticket_blob.secret_id));
 397
 398         get_random_bytes(&au->nonce, sizeof(au->nonce));
 399         ret = encrypt_authorizer(au, NULL);
 400         if (ret) {
 401                 pr_err("failed to encrypt authorizer: %d", ret);
 402                 goto out_au;
 403         }
 404
 405         dout(" built authorizer nonce %llx len %d\n", au->nonce,
 406              (int)au->buf->vec.iov_len);
 407         return 0;
 408
 409 out_au:
 410         ceph_x_authorizer_cleanup(au);
 411         return ret;
 412 }
 413
 414 static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
 415                                 void **p, void *end)
 416 {
 417         ceph_decode_need(p, end, 1 + sizeof(u64), bad);
 418         ceph_encode_8(p, 1);
 419         ceph_encode_64(p, th->secret_id);
 420         if (th->ticket_blob) {
 421                 const char *buf = th->ticket_blob->vec.iov_base;
 422                 u32 len = th->ticket_blob->vec.iov_len;
 423
 424                 ceph_encode_32_safe(p, end, len, bad);
 425                 ceph_encode_copy_safe(p, end, buf, len, bad);
 426         } else {
 427                 ceph_encode_32_safe(p, end, 0, bad);
 428         }
 429
 430         return 0;
 431 bad:
 432         return -ERANGE;
 433 }
 434
 435 static bool need_key(struct ceph_x_ticket_handler *th)
 436 {
 437         if (!th->have_key)
 438                 return true;
 439
 440         return ktime_get_real_seconds() >= th->renew_after;
 441 }
 442
 443 static bool have_key(struct ceph_x_ticket_handler *th)
 444 {
 445         if (th->have_key) {
 446                 if (ktime_get_real_seconds() >= th->expires)
 447                         th->have_key = false;
 448         }
 449
 450         return th->have_key;
 451 }
 452
 453 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
 454 {
 455         int want = ac->want_keys;
 456         struct ceph_x_info *xi = ac->private;
 457         int service;
 458
 459         *pneed = ac->want_keys & ~(xi->have_keys);
 460
 461         for (service = 1; service <= want; service <<= 1) {
 462                 struct ceph_x_ticket_handler *th;
 463
 464                 if (!(ac->want_keys & service))
 465                         continue;
 466
 467                 if (*pneed & service)
 468                         continue;
 469
 470                 th = get_ticket_handler(ac, service);
 471                 if (IS_ERR(th)) {
 472                         *pneed |= service;
 473                         continue;
 474                 }
 475
 476                 if (need_key(th))
 477                         *pneed |= service;
 478                 if (!have_key(th))
 479                         xi->have_keys &= ~service;
 480         }
 481 }
 482
 483 static int ceph_x_build_request(struct ceph_auth_client *ac,
 484                                 void *buf, void *end)
 485 {
 486         struct ceph_x_info *xi = ac->private;
 487         int need;
 488         struct ceph_x_request_header *head = buf;
 489         int ret;
 490         struct ceph_x_ticket_handler *th =
 491                 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 492
 493         if (IS_ERR(th))
 494                 return PTR_ERR(th);
 495
 496         ceph_x_validate_tickets(ac, &need);
 497
 498         dout("build_request want %x have %x need %x\n",
 499              ac->want_keys, xi->have_keys, need);
 500
 501         if (need & CEPH_ENTITY_TYPE_AUTH) {
 502                 struct ceph_x_authenticate *auth = (void *)(head + 1);
 503                 void *p = auth + 1;
 504                 void *enc_buf = xi->auth_authorizer.enc_buf;
 505                 struct ceph_x_challenge_blob *blob = enc_buf +
 506                                                         ceph_x_encrypt_offset();
 507                 u64 *u;
 508
 509                 if (p > end)
 510                         return -ERANGE;
 511
 512                 dout(" get_auth_session_key\n");
 513                 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
 514
 515                 /* encrypt and hash */
 516                 get_random_bytes(&auth->client_challenge, sizeof(u64));
 517                 blob->client_challenge = auth->client_challenge;
 518                 blob->server_challenge = cpu_to_le64(xi->server_challenge);
 519                 ret = ceph_x_encrypt(&xi->secret, enc_buf, CEPHX_AU_ENC_BUF_LEN,
 520                                      sizeof(*blob));
 521                 if (ret < 0)
 522                         return ret;
 523
 524                 auth->struct_v = 1;
 525                 auth->key = 0;
 526                 for (u = (u64 *)enc_buf; u + 1 <= (u64 *)(enc_buf + ret); u++)
 527                         auth->key ^= *(__le64 *)u;
 528                 dout(" server_challenge %llx client_challenge %llx key %llx\n",
 529                      xi->server_challenge, le64_to_cpu(auth->client_challenge),
 530                      le64_to_cpu(auth->key));
 531
 532                 /* now encode the old ticket if exists */
 533                 ret = ceph_x_encode_ticket(th, &p, end);
 534                 if (ret < 0)
 535                         return ret;
 536
 537                 return p - buf;
 538         }
 539
 540         if (need) {
 541                 void *p = head + 1;
 542                 struct ceph_x_service_ticket_request *req;
 543
 544                 if (p > end)
 545                         return -ERANGE;
 546                 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
 547
 548                 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
 549                 if (ret)
 550                         return ret;
 551                 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
 552                                  xi->auth_authorizer.buf->vec.iov_len);
 553
 554                 req = p;
 555                 req->keys = cpu_to_le32(need);
 556                 p += sizeof(*req);
 557                 return p - buf;
 558         }
 559
 560         return 0;
 561 }
 562
 563 static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
 564                                void *buf, void *end)
 565 {
 566         struct ceph_x_info *xi = ac->private;
 567         struct ceph_x_reply_header *head = buf;
 568         struct ceph_x_ticket_handler *th;
 569         int len = end - buf;
 570         int op;
 571         int ret;
 572
 573         if (result)
 574                 return result;  /* XXX hmm? */
 575
 576         if (xi->starting) {
 577                 /* it's a hello */
 578                 struct ceph_x_server_challenge *sc = buf;
 579
 580                 if (len != sizeof(*sc))
 581                         return -EINVAL;
 582                 xi->server_challenge = le64_to_cpu(sc->server_challenge);
 583                 dout("handle_reply got server challenge %llx\n",
 584                      xi->server_challenge);
 585                 xi->starting = false;
 586                 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
 587                 return -EAGAIN;
 588         }
 589
 590         op = le16_to_cpu(head->op);
 591         result = le32_to_cpu(head->result);
 592         dout("handle_reply op %d result %d\n", op, result);
 593         switch (op) {
 594         case CEPHX_GET_AUTH_SESSION_KEY:
 595                 /* verify auth key */
 596                 ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
 597                                                buf + sizeof(*head), end);
 598                 break;
 599
 600         case CEPHX_GET_PRINCIPAL_SESSION_KEY:
 601                 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 602                 if (IS_ERR(th))
 603                         return PTR_ERR(th);
 604                 ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
 605                                                buf + sizeof(*head), end);
 606                 break;
 607
 608         default:
 609                 return -EINVAL;
 610         }
 611         if (ret)
 612                 return ret;
 613         if (ac->want_keys == xi->have_keys)
 614                 return 0;
 615         return -EAGAIN;
 616 }
 617
 618 static void ceph_x_destroy_authorizer(struct ceph_authorizer *a)
 619 {
 620         struct ceph_x_authorizer *au = (void *)a;
 621
 622         ceph_x_authorizer_cleanup(au);
 623         kfree(au);
 624 }
 625
 626 static int ceph_x_create_authorizer(
 627         struct ceph_auth_client *ac, int peer_type,
 628         struct ceph_auth_handshake *auth)
 629 {
 630         struct ceph_x_authorizer *au;
 631         struct ceph_x_ticket_handler *th;
 632         int ret;
 633
 634         th = get_ticket_handler(ac, peer_type);
 635         if (IS_ERR(th))
 636                 return PTR_ERR(th);
 637
 638         au = kzalloc(sizeof(*au), GFP_NOFS);
 639         if (!au)
 640                 return -ENOMEM;
 641
 642         au->base.destroy = ceph_x_destroy_authorizer;
 643
 644         ret = ceph_x_build_authorizer(ac, th, au);
 645         if (ret) {
 646                 kfree(au);
 647                 return ret;
 648         }
 649
 650         auth->authorizer = (struct ceph_authorizer *) au;
 651         auth->authorizer_buf = au->buf->vec.iov_base;
 652         auth->authorizer_buf_len = au->buf->vec.iov_len;
 653         auth->authorizer_reply_buf = au->enc_buf;
 654         auth->authorizer_reply_buf_len = CEPHX_AU_ENC_BUF_LEN;
 655         auth->sign_message = ac->ops->sign_message;
 656         auth->check_message_signature = ac->ops->check_message_signature;
 657
 658         return 0;
 659 }
 660
 661 static int ceph_x_update_authorizer(
 662         struct ceph_auth_client *ac, int peer_type,
 663         struct ceph_auth_handshake *auth)
 664 {
 665         struct ceph_x_authorizer *au;
 666         struct ceph_x_ticket_handler *th;
 667
 668         th = get_ticket_handler(ac, peer_type);
 669         if (IS_ERR(th))
 670                 return PTR_ERR(th);
 671
 672         au = (struct ceph_x_authorizer *)auth->authorizer;
 673         if (au->secret_id < th->secret_id) {
 674                 dout("ceph_x_update_authorizer service %u secret %llu < %llu\n",
 675                      au->service, au->secret_id, th->secret_id);
 676                 return ceph_x_build_authorizer(ac, th, au);
 677         }
 678         return 0;
 679 }
 680
 681 static int decrypt_authorize_challenge(struct ceph_x_authorizer *au,
 682                                        void *challenge_buf,
 683                                        int challenge_buf_len,
 684                                        u64 *server_challenge)
 685 {
 686         struct ceph_x_authorize_challenge *ch =
 687             challenge_buf + sizeof(struct ceph_x_encrypt_header);
 688         int ret;
 689
 690         /* no leading len */
 691         ret = __ceph_x_decrypt(&au->session_key, challenge_buf,
 692                                challenge_buf_len);
 693         if (ret < 0)
 694                 return ret;
 695         if (ret < sizeof(*ch)) {
 696                 pr_err("bad size %d for ceph_x_authorize_challenge\n", ret);
 697                 return -EINVAL;
 698         }
 699
 700         *server_challenge = le64_to_cpu(ch->server_challenge);
 701         return 0;
 702 }
 703
 704 static int ceph_x_add_authorizer_challenge(struct ceph_auth_client *ac,
 705                                            struct ceph_authorizer *a,
 706                                            void *challenge_buf,
 707                                            int challenge_buf_len)
 708 {
 709         struct ceph_x_authorizer *au = (void *)a;
 710         u64 server_challenge;
 711         int ret;
 712
 713         ret = decrypt_authorize_challenge(au, challenge_buf, challenge_buf_len,
 714                                           &server_challenge);
 715         if (ret) {
 716                 pr_err("failed to decrypt authorize challenge: %d", ret);
 717                 return ret;
 718         }
 719
 720         ret = encrypt_authorizer(au, &server_challenge);
 721         if (ret) {
 722                 pr_err("failed to encrypt authorizer w/ challenge: %d", ret);
 723                 return ret;
 724         }
 725
 726         return 0;
 727 }
 728
 729 static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
 730                                           struct ceph_authorizer *a)
 731 {
 732         struct ceph_x_authorizer *au = (void *)a;
 733         void *p = au->enc_buf;
 734         struct ceph_x_authorize_reply *reply = p + ceph_x_encrypt_offset();
 735         int ret;
 736
 737         ret = ceph_x_decrypt(&au->session_key, &p, p + CEPHX_AU_ENC_BUF_LEN);
 738         if (ret < 0)
 739                 return ret;
 740         if (ret < sizeof(*reply)) {
 741                 pr_err("bad size %d for ceph_x_authorize_reply\n", ret);
 742                 return -EINVAL;
 743         }
 744
 745         if (au->nonce + 1 != le64_to_cpu(reply->nonce_plus_one))
 746                 ret = -EPERM;
 747         else
 748                 ret = 0;
 749         dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
 750              au->nonce, le64_to_cpu(reply->nonce_plus_one), ret);
 751         return ret;
 752 }
 753
 754 static void ceph_x_reset(struct ceph_auth_client *ac)
 755 {
 756         struct ceph_x_info *xi = ac->private;
 757
 758         dout("reset\n");
 759         xi->starting = true;
 760         xi->server_challenge = 0;
 761 }
 762
 763 static void ceph_x_destroy(struct ceph_auth_client *ac)
 764 {
 765         struct ceph_x_info *xi = ac->private;
 766         struct rb_node *p;
 767
 768         dout("ceph_x_destroy %p\n", ac);
 769         ceph_crypto_key_destroy(&xi->secret);
 770
 771         while ((p = rb_first(&xi->ticket_handlers)) != NULL) {
 772                 struct ceph_x_ticket_handler *th =
 773                         rb_entry(p, struct ceph_x_ticket_handler, node);
 774                 remove_ticket_handler(ac, th);
 775         }
 776
 777         ceph_x_authorizer_cleanup(&xi->auth_authorizer);
 778
 779         kfree(ac->private);
 780         ac->private = NULL;
 781 }
 782
 783 static void invalidate_ticket(struct ceph_auth_client *ac, int peer_type)
 784 {
 785         struct ceph_x_ticket_handler *th;
 786
 787         th = get_ticket_handler(ac, peer_type);
 788         if (!IS_ERR(th))
 789                 th->have_key = false;
 790 }
 791
 792 static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
 793                                          int peer_type)
 794 {
 795         /*
 796          * We are to invalidate a service ticket in the hopes of
 797          * getting a new, hopefully more valid, one.  But, we won't get
 798          * it unless our AUTH ticket is good, so invalidate AUTH ticket
 799          * as well, just in case.
 800          */
 801         invalidate_ticket(ac, peer_type);
 802         invalidate_ticket(ac, CEPH_ENTITY_TYPE_AUTH);
 803 }
 804
 805 static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg,
 806                           __le64 *psig)
 807 {
 808         void *enc_buf = au->enc_buf;
 809         int ret;
 810
 811         if (!CEPH_HAVE_FEATURE(msg->con->peer_features, CEPHX_V2)) {
 812                 struct {
 813                         __le32 len;
 814                         __le32 header_crc;
 815                         __le32 front_crc;
 816                         __le32 middle_crc;
 817                         __le32 data_crc;
 818                 } __packed *sigblock = enc_buf + ceph_x_encrypt_offset();
 819
 820                 sigblock->len = cpu_to_le32(4*sizeof(u32));
 821                 sigblock->header_crc = msg->hdr.crc;
 822                 sigblock->front_crc = msg->footer.front_crc;
 823                 sigblock->middle_crc = msg->footer.middle_crc;
 824                 sigblock->data_crc =  msg->footer.data_crc;
 825
 826                 ret = ceph_x_encrypt(&au->session_key, enc_buf,
 827                                      CEPHX_AU_ENC_BUF_LEN, sizeof(*sigblock));
 828                 if (ret < 0)
 829                         return ret;
 830
 831                 *psig = *(__le64 *)(enc_buf + sizeof(u32));
 832         } else {
 833                 struct {
 834                         __le32 header_crc;
 835                         __le32 front_crc;
 836                         __le32 front_len;
 837                         __le32 middle_crc;
 838                         __le32 middle_len;
 839                         __le32 data_crc;
 840                         __le32 data_len;
 841                         __le32 seq_lower_word;
 842                 } __packed *sigblock = enc_buf;
 843                 struct {
 844                         __le64 a, b, c, d;
 845                 } __packed *penc = enc_buf;
 846                 int ciphertext_len;
 847
 848                 sigblock->header_crc = msg->hdr.crc;
 849                 sigblock->front_crc = msg->footer.front_crc;
 850                 sigblock->front_len = msg->hdr.front_len;
 851                 sigblock->middle_crc = msg->footer.middle_crc;
 852                 sigblock->middle_len = msg->hdr.middle_len;
 853                 sigblock->data_crc =  msg->footer.data_crc;
 854                 sigblock->data_len = msg->hdr.data_len;
 855                 sigblock->seq_lower_word = *(__le32 *)&msg->hdr.seq;
 856
 857                 /* no leading len, no ceph_x_encrypt_header */
 858                 ret = ceph_crypt(&au->session_key, true, enc_buf,
 859                                  CEPHX_AU_ENC_BUF_LEN, sizeof(*sigblock),
 860                                  &ciphertext_len);
 861                 if (ret)
 862                         return ret;
 863
 864                 *psig = penc->a ^ penc->b ^ penc->c ^ penc->d;
 865         }
 866
 867         return 0;
 868 }
 869
 870 static int ceph_x_sign_message(struct ceph_auth_handshake *auth,
 871                                struct ceph_msg *msg)
 872 {
 873         __le64 sig;
 874         int ret;
 875
 876         if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN))
 877                 return 0;
 878
 879         ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer,
 880                              msg, &sig);
 881         if (ret)
 882                 return ret;
 883
 884         msg->footer.sig = sig;
 885         msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED;
 886         return 0;
 887 }
 888
 889 static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth,
 890                                           struct ceph_msg *msg)
 891 {
 892         __le64 sig_check;
 893         int ret;
 894
 895         if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN))
 896                 return 0;
 897
 898         ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer,
 899                              msg, &sig_check);
 900         if (ret)
 901                 return ret;
 902         if (sig_check == msg->footer.sig)
 903                 return 0;
 904         if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED)
 905                 dout("ceph_x_check_message_signature %p has signature %llx "
 906                      "expect %llx\n", msg, msg->footer.sig, sig_check);
 907         else
 908                 dout("ceph_x_check_message_signature %p sender did not set "
 909                      "CEPH_MSG_FOOTER_SIGNED\n", msg);
 910         return -EBADMSG;
 911 }
 912
 913 static const struct ceph_auth_client_ops ceph_x_ops = {
 914         .name = "x",
 915         .is_authenticated = ceph_x_is_authenticated,
 916         .should_authenticate = ceph_x_should_authenticate,
 917         .build_request = ceph_x_build_request,
 918         .handle_reply = ceph_x_handle_reply,
 919         .create_authorizer = ceph_x_create_authorizer,
 920         .update_authorizer = ceph_x_update_authorizer,
 921         .add_authorizer_challenge = ceph_x_add_authorizer_challenge,
 922         .verify_authorizer_reply = ceph_x_verify_authorizer_reply,
 923         .invalidate_authorizer = ceph_x_invalidate_authorizer,
 924         .reset =  ceph_x_reset,
 925         .destroy = ceph_x_destroy,
 926         .sign_message = ceph_x_sign_message,
 927         .check_message_signature = ceph_x_check_message_signature,
 928 };
 929
 930
 931 int ceph_x_init(struct ceph_auth_client *ac)
 932 {
 933         struct ceph_x_info *xi;
 934         int ret;
 935
 936         dout("ceph_x_init %p\n", ac);
 937         ret = -ENOMEM;
 938         xi = kzalloc(sizeof(*xi), GFP_NOFS);
 939         if (!xi)
 940                 goto out;
 941
 942         ret = -EINVAL;
 943         if (!ac->key) {
 944                 pr_err("no secret set (for auth_x protocol)\n");
 945                 goto out_nomem;
 946         }
 947
 948         ret = ceph_crypto_key_clone(&xi->secret, ac->key);
 949         if (ret < 0) {
 950                 pr_err("cannot clone key: %d\n", ret);
 951                 goto out_nomem;
 952         }
 953
 954         xi->starting = true;
 955         xi->ticket_handlers = RB_ROOT;
 956
 957         ac->protocol = CEPH_AUTH_CEPHX;
 958         ac->private = xi;
 959         ac->ops = &ceph_x_ops;
 960         return 0;
 961
 962 out_nomem:
 963         kfree(xi);
 964 out:
 965         return ret;
 966 }