aacs.c 41.4 KB
Newer Older
1 2
/*
 * This file is part of libaacs
3
 * Copyright (C) 2009-2010  Obliter0n
4
 * Copyright (C) 2009-2013  npzacs
5
 *
gates's avatar
gates committed
6 7 8 9
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
10
 *
gates's avatar
gates committed
11
 * This library is distributed in the hope that it will be useful,
12
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
gates's avatar
gates committed
13 14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
15
 *
gates's avatar
gates committed
16 17 18
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library. If not, see
 * <http://www.gnu.org/licenses/>.
19 20
 */

npzacs's avatar
npzacs committed
21 22 23 24
#if HAVE_CONFIG_H
#include "config.h"
#endif

npzacs's avatar
npzacs committed
25
#include "util/attributes.h"
npzacs's avatar
npzacs committed
26

npzacs's avatar
npzacs committed
27
#include "aacs-version.h"
cRTrn13's avatar
cRTrn13 committed
28
#include "aacs.h"
npzacs's avatar
npzacs committed
29 30
#include "cci.h"
#include "cci_data.h"
npzacs's avatar
npzacs committed
31
#include "content_cert.h"
32
#include "crypto.h"
cRTrn13's avatar
cRTrn13 committed
33
#include "mmc.h"
34
#include "mkb.h"
npzacs's avatar
npzacs committed
35
#include "unit_key.h"
gates's avatar
gates committed
36
#include "file/file.h"
gates's avatar
gates committed
37
#include "file/keydbcfg.h"
38 39
#include "util/macro.h"
#include "util/logging.h"
40
#include "util/strutl.h"
cRTrn13's avatar
cRTrn13 committed
41

42
#include <inttypes.h>
43
#include <string.h>
44
#include <stdio.h>
npzacs's avatar
npzacs committed
45 46 47
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
48
#include <gcrypt.h>
49

npzacs's avatar
npzacs committed
50

npzacs's avatar
npzacs committed
51 52 53 54
#define SECTOR_LEN       2048  /* bus encryption block size */
#define ALIGNED_UNIT_LEN 6144  /* aacs block size */


npzacs's avatar
npzacs committed
55
struct aacs {
npzacs's avatar
npzacs committed
56 57 58
    void           *fopen_handle;
    AACS_FILE_OPEN2 fopen;

npzacs's avatar
npzacs committed
59 60 61 62 63
    /* current disc */
    char     *path;
    int       mkb_version;
    uint8_t   disc_id[20];

64 65
    /* VID is cached for BD-J */
    uint8_t   vid[16];
66 67
    /* PMSN is cached for BD-J */
    uint8_t   pmsn[16];
npzacs's avatar
npzacs committed
68 69
    /* Media key is cached for BD+ */
    uint8_t   mk[16];
npzacs's avatar
npzacs committed
70

npzacs's avatar
npzacs committed
71 72
    /* Unit keys */
    AACS_UK  *uk;
npzacs's avatar
npzacs committed
73

npzacs's avatar
npzacs committed
74 75
    /* CPS unit of currently selected title */
    uint16_t  current_cps_unit;
76
    uint8_t   cps_unit_selected;
npzacs's avatar
npzacs committed
77

78 79
    int       no_cache; /* do not use cached keys */

80 81 82
    /* bus encryption */
    int       bee;        /* bus encryption enabled flag in content certificate */
    int       bec;        /* bus encryption capable flag in drive certificate */
83
    uint8_t   read_data_key[16];
84

npzacs's avatar
npzacs committed
85 86 87
    /* content certificate */
    CONTENT_CERT *cc;

88 89 90
    /* AACS Online (BD-J) */
    uint8_t   device_nonce[16];
    uint8_t   device_binding_id[16];
npzacs's avatar
npzacs committed
91 92
};

93 94 95
static const uint8_t empty_key[20] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                                       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                                       0x00, 0x00, 0x00, 0x00 };
96 97
static const uint8_t aacs_iv[16]   = { 0x0b, 0xa0, 0xf8, 0xdd, 0xfe, 0xa6, 0x1f, 0xb3,
                                       0xd8, 0xdf, 0x9f, 0x56, 0x6a, 0x05, 0x0f, 0x78 };
98

npzacs's avatar
npzacs committed
99 100 101 102
/*
 * Validate processing key using media key verification data
 */

103 104
static int _validate_pk(const uint8_t *pk,
                        const uint8_t *cvalue, const uint8_t *uv, const uint8_t *vd,
npzacs's avatar
npzacs committed
105
                        uint8_t *mk)
cRTrn13's avatar
cRTrn13 committed
106
{
107
    gcry_cipher_hd_t gcry_h;
npzacs's avatar
npzacs committed
108
    int a;
cRTrn13's avatar
cRTrn13 committed
109
    uint8_t dec_vd[16];
110
    char str[40];
cRTrn13's avatar
cRTrn13 committed
111

npzacs's avatar
npzacs committed
112
    BD_DEBUG(DBG_AACS, "Validate processing key %s...\n", str_print_hex(str, pk, 16));
npzacs's avatar
npzacs committed
113
    BD_DEBUG(DBG_AACS, " Using:\n");
npzacs's avatar
npzacs committed
114 115 116
    BD_DEBUG(DBG_AACS, "   UV: %s\n", str_print_hex(str, uv, 4));
    BD_DEBUG(DBG_AACS, "   cvalue: %s\n", str_print_hex(str, cvalue, 16));
    BD_DEBUG(DBG_AACS, "   Verification data: %s\n", str_print_hex(str, vd, 16));
117

118 119 120
    gcry_cipher_open(&gcry_h, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_ECB, 0);
    gcry_cipher_setkey(gcry_h, pk, 16);
    gcry_cipher_decrypt(gcry_h, mk, 16, cvalue, 16);
121

cRTrn13's avatar
cRTrn13 committed
122 123 124 125
    for (a = 0; a < 4; a++) {
        mk[a + 12] ^= uv[a];
    }

126 127 128
    gcry_cipher_setkey(gcry_h, mk, 16);
    gcry_cipher_decrypt (gcry_h, dec_vd, 16, vd, 16);
    gcry_cipher_close(gcry_h);
129

cRTrn13's avatar
cRTrn13 committed
130
    if (!memcmp(dec_vd, "\x01\x23\x45\x67\x89\xAB\xCD\xEF", 8)) {
npzacs's avatar
npzacs committed
131
        BD_DEBUG(DBG_AACS, "Processing key %s is valid!\n", str_print_hex(str, pk, 16));
npzacs's avatar
npzacs committed
132
        return AACS_SUCCESS;
cRTrn13's avatar
cRTrn13 committed
133 134
    }

npzacs's avatar
npzacs committed
135
    return AACS_ERROR_NO_PK;
cRTrn13's avatar
cRTrn13 committed
136
}
137

npzacs's avatar
npzacs committed
138 139 140 141
/*
 * Revocation lists
 */

142 143
static int _rl_verify_signature(const uint8_t *rl, size_t size)
{
npzacs's avatar
npzacs committed
144 145 146 147 148 149 150 151 152 153
    if (size < 40) {
        BD_DEBUG(DBG_AACS, "too small revocation list\n");
        return 0;
    }

    uint32_t entries = MKINT_BE32(rl + 12 + 8);
    if (entries >= (0xffffffff - 24 - 40) / 8) {
        BD_DEBUG(DBG_AACS, "invalid revocation list\n");
        return 0;
    }
154

npzacs's avatar
npzacs committed
155 156
    size_t len = 12 + 12 + 8 * entries; /* type_and_version_rec=12, rl_header=12, rl=entries*8 */
    if (len > size - 40) {
npzacs's avatar
npzacs committed
157
        BD_DEBUG(DBG_AACS, "revocation list size mismatch\n");
158 159 160 161 162 163
        return 0;
    }

    return crypto_aacs_verify_aacsla(rl + len, rl, len);
}

164 165 166 167 168 169
static void _save_rl(const char *name, uint32_t version, const uint8_t *version_rec,
                     const uint8_t *rl_rec, size_t rl_len)
{
    int len     = MKINT_BE24(rl_rec - 3);
    int entries = MKINT_BE32(rl_rec + 4); /* entries in first signature block */
    if (len < 4 || !entries) {
npzacs's avatar
npzacs committed
170
        BD_DEBUG(DBG_AACS | DBG_CRIT, "ignoring empty %s\n", name);
171 172 173
        return;
    }

npzacs's avatar
npzacs committed
174 175
    rl_rec -= 4;
    rl_len += 4;
176

npzacs's avatar
npzacs committed
177 178
    uint8_t *data = malloc(12 + rl_len);
    if (data) {
179 180 181
        memcpy(data,      version_rec, 12);
        memcpy(data + 12, rl_rec,      rl_len);
        if (!_rl_verify_signature(data, rl_len + 12)) {
npzacs's avatar
npzacs committed
182
            BD_DEBUG(DBG_AACS | DBG_CRIT, "invalid %s signature, not using it\n", name);
183
        } else {
npzacs's avatar
npzacs committed
184
            cache_save(name, version, data, rl_len + 12);
185 186 187 188 189 190
        }
        X_FREE(data);
    }
}

static void _update_rl(MKB *mkb)
191 192 193
{
    uint32_t version = mkb_version(mkb);
    uint32_t cache_version;
194
    size_t   rl_len;
195

196
    if (!cache_get("drl", &cache_version, NULL, NULL, 0) || cache_version < version) {
197 198
        const uint8_t *version_rec = mkb_type_and_version_record(mkb);
        const uint8_t *drl_rec     = mkb_drive_revokation_entries(mkb, &rl_len);
npzacs's avatar
npzacs committed
199
        if (drl_rec && version_rec && rl_len > 8) {
200 201 202
            _save_rl("drl", version, version_rec, drl_rec, rl_len);
        }
    }
203
    if (!cache_get("hrl", &cache_version, NULL, NULL, 0) || cache_version < version) {
204 205
        const uint8_t *version_rec = mkb_type_and_version_record(mkb);
        const uint8_t *hrl_rec     = mkb_host_revokation_entries(mkb, &rl_len);
npzacs's avatar
npzacs committed
206
        if (hrl_rec && version_rec && rl_len > 8) {
207
            _save_rl("hrl", version, version_rec, hrl_rec, rl_len);
208 209 210 211
        }
    }
}

npzacs's avatar
npzacs committed
212 213 214 215
/*
 * Derive media key using full set of device keys
 */

216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242
static uint32_t _calc_v_mask(uint32_t uv)
{
    uint32_t v_mask = 0xffffffff;

    while (!(uv & ~v_mask)) {
        v_mask <<= 1;
    }

    return v_mask;
}

static void _calc_pk(const uint8_t *dk, uint8_t *pk, uint32_t uv, uint32_t v_mask, uint32_t dev_key_v_mask)
{
    unsigned char left_child[16], right_child[16];

    crypto_aesg3(dk, left_child, right_child, pk);

    while (dev_key_v_mask != v_mask) {

        int i;
        for (i = 31; i >= 0; i--) {
            if (!(dev_key_v_mask & (1ul << i))) {
                break;
            }
        }

        uint8_t curr_key[16];
npzacs's avatar
npzacs committed
243
        if (i < 0 || !(uv & (1ul << i))) {
244 245 246 247 248 249 250 251 252 253 254
            memcpy(curr_key, left_child, 16);
        } else {
            memcpy(curr_key, right_child, 16);
        }

        crypto_aesg3(curr_key, left_child, right_child, pk);

        dev_key_v_mask = ((int) dev_key_v_mask) >> 1;
    }

    char str[40];
npzacs's avatar
npzacs committed
255
    BD_DEBUG(DBG_AACS, "Processing key: %s\n",  str_print_hex(str, pk, 16));
256 257 258 259 260 261 262 263 264 265 266 267 268
}

static dk_list *_find_dk(dk_list *dkl, uint32_t *p_dev_key_v_mask, uint32_t uv, uint32_t u_mask)
{
    uint32_t device_number = dkl->node;
    uint32_t dev_key_uv, dev_key_u_mask, dev_key_v_mask;
    unsigned key_idx = 0;

    for (; dkl; dkl = dkl->next) {
        if (device_number != dkl->node) {
            /* wrong device */
            continue;
        }
npzacs's avatar
npzacs committed
269 270 271
        if (!dkl->uv) {
            continue;
        }
272 273 274 275 276 277 278 279 280 281 282 283
        key_idx++;
        dev_key_uv     = dkl->uv;
        dev_key_u_mask = 0xffffffff << dkl->u_mask_shift;
        dev_key_v_mask = _calc_v_mask(dev_key_uv);

        if ((u_mask == dev_key_u_mask) &&
            ((uv & dev_key_v_mask) == (dev_key_uv & dev_key_v_mask))) {
            break;
        }
    }

    if (!dkl) {
npzacs's avatar
npzacs committed
284
        BD_DEBUG(DBG_AACS | DBG_CRIT, "could not find applying device key (device 0x%x)\n", device_number);
285 286
    } else {
        char str[128];
npzacs's avatar
npzacs committed
287
        BD_DEBUG(DBG_AACS, "Applying device key is #%d %s\n", key_idx, str_print_hex(str, dkl->key, 16));
npzacs's avatar
npzacs committed
288
        BD_DEBUG(DBG_AACS, "  UV: 0x%08x  U mask: 0x%08x  V mask: 0x%08x\n", dev_key_uv, dev_key_u_mask, dev_key_v_mask);
289 290 291 292 293 294
        *p_dev_key_v_mask = dev_key_v_mask;
    }

    return dkl;
}

npzacs's avatar
npzacs committed
295
static int _calc_mk_dks(MKB *mkb, dk_list *dkl, uint8_t *mk)
296 297 298
{
    /* calculate processing key and media key using device keys */

npzacs's avatar
npzacs committed
299
    const uint8_t *uvs, *cvalues, *mk_dv;
300 301 302 303 304 305 306 307
    unsigned num_uvs;
    size_t len;
    char str[128];

    /* get mkb data */

    uvs     = mkb_subdiff_records(mkb, &len);
    cvalues = mkb_cvalues(mkb, &len);
npzacs's avatar
npzacs committed
308 309 310 311 312 313 314 315
    mk_dv   = mkb_mk_dv(mkb);

    if (!uvs || !cvalues || !mk_dv) {
        BD_DEBUG(DBG_AACS | DBG_CRIT, "Missing MKB records (uvs %p, cvalues %p, mk_dv %p)\n",
                 (const void*)uvs, (const void*)cvalues, (const void*)mk_dv);
        return AACS_ERROR_CORRUPTED_DISC;
    }

316 317 318
    num_uvs = len / 5;

    if (num_uvs < 1) {
319
        BD_DEBUG(DBG_AACS | DBG_CRIT, "No UVS detected - corrupted disc\n");
320 321 322 323 324 325 326 327 328 329 330 331 332 333 334
        return AACS_ERROR_CORRUPTED_DISC;
    }

    /* loop over all known devices */

    dk_list *dk_num;
    uint32_t device_number = (uint32_t)-1;

    for (dk_num = dkl; dk_num; dk_num = dk_num->next) {

        /* find next device */

        if (device_number == dk_num->node) {
            continue;
        }
335
        device_number = dk_num->node;
336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351

        /* find applying subset difference */

        unsigned uvs_idx;
        uint32_t u_mask, v_mask, uv;

        for (uvs_idx = 0; uvs_idx < num_uvs; uvs_idx++) {
            const uint8_t *p_uv = uvs + 1 + 5 * uvs_idx;
            uint8_t u_mask_shift = p_uv[-1];

            uv = MKINT_BE32(p_uv);
            if (!uv) {
                continue;
            }

            if (u_mask_shift & 0xc0) {
npzacs's avatar
npzacs committed
352
                BD_DEBUG(DBG_AACS | DBG_CRIT, "device 0x%x is revoked\n", device_number);
353 354 355 356 357 358 359 360 361 362 363 364 365 366
                uvs_idx = num_uvs;

            } else {

                u_mask = 0xffffffff << u_mask_shift;
                v_mask = _calc_v_mask(uv);

                if (((device_number & u_mask) == (uv & u_mask)) && ((device_number & v_mask) != (uv & v_mask))) {
                    break;
                }
            }
        }

        if (uvs_idx >= num_uvs) {
npzacs's avatar
npzacs committed
367
            BD_DEBUG(DBG_AACS | DBG_CRIT, "could not find applying subset-difference for device 0x%x\n", device_number);
368 369 370 371
            /* try next device */
            continue;
        }

npzacs's avatar
npzacs committed
372 373
        BD_DEBUG(DBG_AACS, "Applying subset-difference for device 0x%x is #%d:\n", device_number, uvs_idx);
        BD_DEBUG(DBG_AACS,"  UV: 0x%08x  U mask: 0x%08x  V mask: 0x%08x\n", uv, u_mask, v_mask);
374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395

        /* find applying device key */

        uint32_t dev_key_v_mask = 0;
        dk_list *dk;

        dk = _find_dk(dk_num, &dev_key_v_mask, uv, u_mask);
        if (!dk) {
            /* try next device */
            continue;
        }

        /* calculate processing key */

        uint8_t pk[16];
        _calc_pk(dk->key, pk, uv, v_mask, dev_key_v_mask);

        /* calculate and verify media key */

        if ( _validate_pk(pk,
                          cvalues + uvs_idx * 16,
                          uvs + 1 + uvs_idx * 5,
npzacs's avatar
npzacs committed
396
                          mk_dv,
397 398 399
                          mk)
             == AACS_SUCCESS) {

npzacs's avatar
npzacs committed
400
            BD_DEBUG(DBG_AACS, "Media key: %s\n", str_print_hex(str, mk, 16));
401 402 403
            return AACS_SUCCESS;
        }

npzacs's avatar
npzacs committed
404
        BD_DEBUG(DBG_AACS | DBG_CRIT, "Processing key %s is invalid!\n", str_print_hex(str, pk, 16));
405 406 407 408 409 410 411

        /* try next device */
    }

    return AACS_ERROR_NO_DK;
}

npzacs's avatar
npzacs committed
412 413 414 415
/*
 * file access utils
 */

npzacs's avatar
npzacs committed
416 417 418 419 420
static AACS_FILE_H *_file_open(AACS *aacs, const char *file)
{
    AACS_FILE_H *fp;
    char        *f_name;

npzacs's avatar
npzacs committed
421 422 423
    if (aacs->fopen) {
        return aacs->fopen(aacs->fopen_handle, file);
    }
npzacs's avatar
npzacs committed
424 425 426
    if (!aacs->path) {
        return NULL;
    }
npzacs's avatar
npzacs committed
427

npzacs's avatar
npzacs committed
428
    f_name = str_printf("%s" DIR_SEP "%s", aacs->path, file);
npzacs's avatar
npzacs committed
429 430 431
    if (!f_name) {
        return NULL;
    }
npzacs's avatar
npzacs committed
432 433 434 435 436 437
    fp = file_open(f_name, "rb");
    X_FREE(f_name);

    return fp;
}

npzacs's avatar
npzacs committed
438 439 440 441
static size_t _read_file(AACS *aacs, const char *file, void **data)
{
    AACS_FILE_H *fp = NULL;
    int64_t f_size;
npzacs's avatar
npzacs committed
442
    size_t size;
npzacs's avatar
npzacs committed
443 444 445 446 447 448 449 450 451

    *data = NULL;

    fp = _file_open(aacs, file);
    if (!fp) {
        BD_DEBUG(DBG_AACS | DBG_CRIT, "Unable to open %s\n", file);
        return 0;
    }

npzacs's avatar
npzacs committed
452
    f_size = file_size(fp);
npzacs's avatar
npzacs committed
453 454 455
    size = f_size;
    if (f_size <= 0 || f_size != (int64_t)size) {
        BD_DEBUG(DBG_AACS | DBG_CRIT, "Invalid size %"PRId64" for %s\n", f_size, file);
npzacs's avatar
npzacs committed
456 457 458
        file_close(fp);
        return 0;
    }
npzacs's avatar
npzacs committed
459

npzacs's avatar
npzacs committed
460
    *data = malloc(size);
npzacs's avatar
npzacs committed
461 462 463 464 465 466 467 468 469 470 471
    if (*data) {
        if (file_read(fp, *data, f_size) != f_size) {
            BD_DEBUG(DBG_AACS | DBG_CRIT, "Failed reading %s\n", file);
            X_FREE(*data);
        }
    } else {
        BD_DEBUG(DBG_AACS | DBG_CRIT, "Out of memory\n");
    }

    file_close(fp);

npzacs's avatar
npzacs committed
472
    return *data ? size : 0;
npzacs's avatar
npzacs committed
473 474
}

npzacs's avatar
npzacs committed
475 476
static MKB *_mkb_open(AACS *aacs)
{
npzacs's avatar
npzacs committed
477 478 479
    size_t  size;
    void   *data;
    MKB    *mkb;
npzacs's avatar
npzacs committed
480

npzacs's avatar
npzacs committed
481
    size = _read_file(aacs, "AACS" DIR_SEP "MKB_RO.inf", &data);
482 483 484 485 486
    if (size < 4) {
        /* retry with backup file */
        X_FREE(data);
        size = _read_file(aacs, "AACS" DIR_SEP "DUPLICATE" DIR_SEP "MKB_RO.inf", &data);
    }
npzacs's avatar
npzacs committed
487 488 489
    if (size < 4) {
        X_FREE(data);
        BD_DEBUG(DBG_AACS | DBG_CRIT, "Error reading MKB file (AACS/MKB_RO.inf)\n");
npzacs's avatar
npzacs committed
490 491 492
        return NULL;
    }

npzacs's avatar
npzacs committed
493 494 495 496
    mkb = mkb_init(data, size);
    if (!mkb) {
        X_FREE(data);
    }
npzacs's avatar
npzacs committed
497 498 499
    return mkb;
}

npzacs's avatar
npzacs committed
500 501 502 503
/*
 * Calculate media key using a set of processing keys
 */

npzacs's avatar
npzacs committed
504
static int _calc_mk_pks(MKB *mkb, pk_list *pkl, uint8_t *mk)
cRTrn13's avatar
keyfile  
cRTrn13 committed
505 506 507
{
    int a, num_uvs = 0;
    size_t len;
npzacs's avatar
npzacs committed
508
    const uint8_t *rec, *uvs, *mk_dv;
cRTrn13's avatar
keyfile  
cRTrn13 committed
509

npzacs's avatar
npzacs committed
510 511 512 513 514
    mk_dv = mkb_mk_dv(mkb);
    if (!mk_dv) {
        BD_DEBUG(DBG_AACS | DBG_CRIT, "Missing MKB DV record\n");
        return AACS_ERROR_CORRUPTED_DISC;
    }
npzacs's avatar
npzacs committed
515

npzacs's avatar
npzacs committed
516 517 518 519 520 521 522 523 524
    BD_DEBUG(DBG_AACS, "Get UVS...\n");
    uvs = mkb_subdiff_records(mkb, &len);
    rec = uvs;
    while (rec < uvs + len) {
        if (rec[0] & 0xc0)
            break;
        rec += 5;
        num_uvs++;
    }
cRTrn13's avatar
keyfile  
cRTrn13 committed
525

npzacs's avatar
npzacs committed
526 527 528 529 530 531
    BD_DEBUG(DBG_AACS, "Get cvalues...\n");
    rec = mkb_cvalues(mkb, &len);
    if (!rec) {
        BD_DEBUG(DBG_AACS | DBG_CRIT, "Missing MKB CVALUES record\n");
        return AACS_ERROR_CORRUPTED_DISC;
    }
532

npzacs's avatar
npzacs committed
533 534
    for (; pkl; pkl = pkl->next) {
        BD_DEBUG(DBG_AACS, "Trying processing key...\n");
535

npzacs's avatar
npzacs committed
536 537
        for (a = 0; a < num_uvs; a++) {
            if (AACS_SUCCESS == _validate_pk(pkl->key, rec + a * 16, uvs + 1 + a * 5, mk_dv, mk)) {
538

npzacs's avatar
npzacs committed
539 540 541
                char str[40];
                BD_DEBUG(DBG_AACS, "Media key: %s\n", str_print_hex(str, mk, 16));
                return AACS_SUCCESS;
cRTrn13's avatar
keyfile  
cRTrn13 committed
542
            }
npzacs's avatar
npzacs committed
543 544
        }
    }
cRTrn13's avatar
keyfile  
cRTrn13 committed
545

npzacs's avatar
npzacs committed
546 547
    BD_DEBUG(DBG_AACS | DBG_CRIT, "Error calculating media key. Missing right processing key ?\n");
    return AACS_ERROR_NO_PK;
npzacs's avatar
npzacs committed
548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572
}

/*
 *
 */

static int _calc_mk(AACS *aacs, uint8_t *mk, pk_list *pkl, dk_list *dkl)
{
    MKB *mkb = NULL;
    int result = AACS_ERROR_NO_PK;

    /* Skip if retrieved from config file */
    if (memcmp(mk, empty_key, 16)) {
        return AACS_SUCCESS;
    }

    BD_DEBUG(DBG_AACS, "Calculate media key...\n");

    mkb = _mkb_open(aacs);
    if (!mkb) {
        BD_DEBUG(DBG_AACS | DBG_CRIT, "Error calculating media key - Failed opening MKB\n");
        return AACS_ERROR_CORRUPTED_DISC;
    }

    aacs->mkb_version = mkb_version(mkb);
573 574 575 576

    if (!aacs->no_cache) {
        _update_rl(mkb);
    }
npzacs's avatar
npzacs committed
577 578 579 580 581 582 583 584 585 586 587

    /* try device keys first */
    if (dkl) {
        result = _calc_mk_dks(mkb, dkl, mk);
    }
    if (result != AACS_SUCCESS) {
        result = _calc_mk_pks(mkb, pkl, mk);
    }

    if (result == AACS_SUCCESS) {
        memcpy(aacs->mk, mk, sizeof(aacs->mk));
npzacs's avatar
npzacs committed
588
    }
npzacs's avatar
npzacs committed
589

npzacs's avatar
npzacs committed
590 591
    mkb_close(mkb);
    return result;
cRTrn13's avatar
keyfile  
cRTrn13 committed
592
}
593

npzacs's avatar
npzacs committed
594 595 596 597
/*
 * MMC device access
 */

npzacs's avatar
npzacs committed
598
static int _mmc_read_auth(AACS *aacs, cert_list *hcl, int type, uint8_t *p1, uint8_t *p2)
cRTrn13's avatar
openssl  
cRTrn13 committed
599
{
cRTrn13's avatar
cRTrn13 committed
600
    MMC* mmc = NULL;
npzacs's avatar
npzacs committed
601
    if (!(mmc = mmc_open(aacs->path))) {
npzacs's avatar
npzacs committed
602
        return AACS_ERROR_MMC_OPEN;
603 604
    }

npzacs's avatar
npzacs committed
605 606
    int error_code = AACS_ERROR_NO_CERT;

607
    const uint8_t *drive_cert = mmc_get_drive_cert(mmc);
608

npzacs's avatar
npzacs committed
609
    for (; hcl ; hcl = hcl->next) {
610 611 612

        char tmp_str[2*92+1];

npzacs's avatar
npzacs committed
613
        if (!crypto_aacs_verify_host_cert(hcl->host_cert)) {
npzacs's avatar
npzacs committed
614
            BD_DEBUG(DBG_AACS, "Not using invalid host certificate %s.\n",
npzacs's avatar
npzacs committed
615
                  str_print_hex(tmp_str, hcl->host_cert, 92));
npzacs's avatar
npzacs committed
616 617
            continue;
        }
618

npzacs's avatar
npzacs committed
619
        if (drive_cert && (drive_cert[1] & 0x01) && !(hcl->host_cert[1] & 0x01)) {
npzacs's avatar
npzacs committed
620
            BD_DEBUG(DBG_AACS, "Certificate (id 0x%s) does not support bus encryption\n",
npzacs's avatar
npzacs committed
621
                  str_print_hex(tmp_str, hcl->host_cert + 4, 6));
622 623 624
            //continue;
        }

npzacs's avatar
npzacs committed
625
        BD_DEBUG(DBG_AACS, "Trying host certificate (id 0x%s)...\n",
npzacs's avatar
npzacs committed
626
              str_print_hex(tmp_str, hcl->host_cert + 4, 6));
627

npzacs's avatar
npzacs committed
628
        int mmc_result = mmc_read_auth(mmc, hcl->host_priv_key, hcl->host_cert, type, p1, p2);
npzacs's avatar
npzacs committed
629 630 631 632 633 634 635 636 637 638 639
        switch (mmc_result) {
            case MMC_SUCCESS:
                mmc_close(mmc);
                return AACS_SUCCESS;
            case MMC_ERROR_CERT_REVOKED:
                error_code = AACS_ERROR_CERT_REVOKED;
                break;
            case MMC_ERROR:
            default:
                error_code = AACS_ERROR_MMC_FAILURE;
                break;
640 641 642 643 644
        }
    }

    mmc_close(mmc);

npzacs's avatar
npzacs committed
645
    return error_code;
646
}
cRTrn13's avatar
openssl  
cRTrn13 committed
647

npzacs's avatar
npzacs committed
648
static int _read_vid(AACS *aacs, cert_list *hcl)
649
{
npzacs's avatar
npzacs committed
650
    /* Use VID given in config file if available */
npzacs's avatar
npzacs committed
651
    if (memcmp(aacs->vid, empty_key, sizeof(aacs->vid))) {
npzacs's avatar
npzacs committed
652
        return AACS_SUCCESS;
653 654
    }

npzacs's avatar
npzacs committed
655 656
    int error_code = _mmc_read_auth(aacs, hcl, MMC_READ_VID, aacs->vid, NULL);
    if (error_code != AACS_SUCCESS) {
npzacs's avatar
npzacs committed
657
        BD_DEBUG(DBG_AACS, "Error reading VID!\n");
npzacs's avatar
npzacs committed
658 659
    } else {
        /* cache vid */
660 661 662 663
        if (!aacs->no_cache) {
            if (memcmp(aacs->disc_id, empty_key, sizeof(aacs->disc_id))) {
                keycache_save("vid", aacs->disc_id, aacs->vid, 16);
            }
664
        }
665 666 667 668
    }
    return error_code;
}

npzacs's avatar
npzacs committed
669
static int _read_read_data_key(AACS *aacs, cert_list *hcl)
Janusz Dziemidowicz's avatar
Janusz Dziemidowicz committed
670
{
npzacs's avatar
npzacs committed
671 672
    int error_code = _mmc_read_auth(aacs, hcl, MMC_READ_DATA_KEYS, aacs->read_data_key, NULL);
    if (error_code != AACS_SUCCESS) {
npzacs's avatar
npzacs committed
673
        BD_DEBUG(DBG_AACS, "Error reading data keys!\n");
Janusz Dziemidowicz's avatar
Janusz Dziemidowicz committed
674
    }
npzacs's avatar
npzacs committed
675 676
    return error_code;
}
Janusz Dziemidowicz's avatar
Janusz Dziemidowicz committed
677

npzacs's avatar
npzacs committed
678 679 680 681
static int _read_pmsn(AACS *aacs, cert_list *hcl)
{
    int error_code = _mmc_read_auth(aacs, hcl, MMC_READ_PMSN, aacs->pmsn, NULL);
    if (error_code != AACS_SUCCESS) {
npzacs's avatar
npzacs committed
682
        BD_DEBUG(DBG_AACS, "Error reading PMSN!\n");
Janusz Dziemidowicz's avatar
Janusz Dziemidowicz committed
683 684 685 686
    }
    return error_code;
}

npzacs's avatar
npzacs committed
687 688 689 690
/*
 * Unit key calculation
 */

691
static int _calc_vuk(AACS *aacs, uint8_t *mk, uint8_t *vuk, config_file *cf)
692
{
npzacs's avatar
npzacs committed
693 694
    int error_code;

695
    /* Skip if retrieved from config file */
696
    if (memcmp(vuk, empty_key, 16)) {
npzacs's avatar
npzacs committed
697
        BD_DEBUG(DBG_AACS, "Using VUK from config file\n");
npzacs's avatar
npzacs committed
698 699
        return AACS_SUCCESS;
    }
700

npzacs's avatar
npzacs committed
701
    /* get cached vuk */
702
    if (!aacs->no_cache && keycache_find("vuk", aacs->disc_id, vuk, 16)) {
npzacs's avatar
npzacs committed
703
        BD_DEBUG(DBG_AACS, "Using cached VUK\n");
npzacs's avatar
npzacs committed
704
        return AACS_SUCCESS;
npzacs's avatar
npzacs committed
705 706
    }

707 708 709 710
    if (!cf) {
        return AACS_ERROR_NO_CONFIG;
    }

711
    /* make sure we have media key */
712
    error_code = _calc_mk(aacs, mk, cf->pkl, cf->dkl);
npzacs's avatar
npzacs committed
713 714
    if (error_code != AACS_SUCCESS) {
        return error_code;
715 716
    }

npzacs's avatar
npzacs committed
717
    /* acquire VID */
718
    error_code = _read_vid(aacs, cf->host_cert_list);
npzacs's avatar
npzacs committed
719 720 721
    if (error_code != AACS_SUCCESS) {
        return error_code;
    }
722

npzacs's avatar
npzacs committed
723
    /* calculate VUK */
724

npzacs's avatar
npzacs committed
725
    crypto_aes128d(mk, aacs->vid, vuk);
726

npzacs's avatar
npzacs committed
727
    int a;
npzacs's avatar
npzacs committed
728
    for (a = 0; a < 16; a++) {
729
        vuk[a] ^= aacs->vid[a];
npzacs's avatar
npzacs committed
730
    }
731

npzacs's avatar
npzacs committed
732
    char str[40];
npzacs's avatar
npzacs committed
733
    BD_DEBUG(DBG_AACS, "Volume unique key: %s\n", str_print_hex(str, vuk, 16));
734

npzacs's avatar
npzacs committed
735
    /* cache vuk */
736 737 738 739
    if (!aacs->no_cache) {
        if (memcmp(aacs->disc_id, empty_key, sizeof(aacs->disc_id))) {
            keycache_save("vuk", aacs->disc_id, vuk, 16);
        }
740
    }
npzacs's avatar
npzacs committed
741

npzacs's avatar
npzacs committed
742
    return AACS_SUCCESS;
cRTrn13's avatar
openssl  
cRTrn13 committed
743 744
}

npzacs's avatar
npzacs committed
745
/* Function that collects keys from keydb config entry */
746 747
static void _find_config_entry(AACS *aacs, title_entry_list *ce,
                               uint8_t *mk, uint8_t *vuk)
npzacs's avatar
npzacs committed
748 749
{
    char str[48];
750
    char str2[48];
npzacs's avatar
npzacs committed
751

npzacs's avatar
npzacs committed
752
    while (ce) {
npzacs's avatar
npzacs committed
753 754 755 756
        if (!memcmp(aacs->disc_id, ce->entry.discid, 20)) {
            BD_DEBUG(DBG_AACS, "Found config entry for discid %s\n",
                     str_print_hex(str, ce->entry.discid, 20));
            break;
npzacs's avatar
npzacs committed
757 758
        }

npzacs's avatar
npzacs committed
759 760 761 762 763
        ce = ce->next;
    }
    if (!ce) {
        return;
    }
npzacs's avatar
npzacs committed
764

npzacs's avatar
npzacs committed
765 766
    if (ce->entry.mek) {
        hexstring_to_hex_array(mk, 16, ce->entry.mek);
npzacs's avatar
npzacs committed
767

npzacs's avatar
npzacs committed
768 769 770
        BD_DEBUG(DBG_AACS, "Found media key for %s: %s\n",
                 str_print_hex(str2, ce->entry.discid, 20), str_print_hex(str, mk, 16));
    }
npzacs's avatar
npzacs committed
771

npzacs's avatar
npzacs committed
772 773 774
    if (ce->entry.vid) {
        hexstring_to_hex_array(aacs->vid, sizeof(aacs->vid),
                               ce->entry.vid);
npzacs's avatar
npzacs committed
775

npzacs's avatar
npzacs committed
776 777 778
        BD_DEBUG(DBG_AACS, "Found volume id for %s: %s\n",
                 str_print_hex(str2, ce->entry.discid, 20), str_print_hex(str, aacs->vid, 16));
    }
npzacs's avatar
npzacs committed
779

npzacs's avatar
npzacs committed
780 781
    if (memcmp(ce->entry.vuk, empty_key, 16)) {
        memcpy(vuk, ce->entry.vuk, 16);
npzacs's avatar
npzacs committed
782

npzacs's avatar
npzacs committed
783 784 785 786 787 788
        BD_DEBUG(DBG_AACS, "Found volume unique key for %s: %s\n",
                 str_print_hex(str2, ce->entry.discid, 20), str_print_hex(str, vuk, 16));
    }

    if (ce->entry.uk) {
        BD_DEBUG(DBG_AACS, "Acquire CPS unit keys from keydb config file...\n");
npzacs's avatar
npzacs committed
789

npzacs's avatar
npzacs committed
790 791
        /* count keys */
        unsigned num_uks = 0;
npzacs's avatar
npzacs committed
792 793
        digit_key_pair_list *ukcursor = ce->entry.uk;
        while (ukcursor && ukcursor->key_pair.key) {
npzacs's avatar
npzacs committed
794 795 796 797 798 799 800 801 802 803
            num_uks++;
            ukcursor = ukcursor->next;
        }

        /* check against Unit_Key_RO.inf */
        if (num_uks != aacs->uk->num_uk) {
            BD_DEBUG(DBG_CRIT | DBG_AACS, "Ignoring unit keys from config file (expected %u keys, found %u)\n",
                     aacs->uk->num_uk, num_uks);
            return;
        }
npzacs's avatar
npzacs committed
804

npzacs's avatar
npzacs committed
805
        /* get keys */
npzacs's avatar
npzacs committed
806

npzacs's avatar
npzacs committed
807 808 809 810
        aacs->uk->uk = calloc(aacs->uk->num_uk, sizeof(aacs->uk->uk[0]));
        if (!aacs->uk->uk) {
            return;
        }
npzacs's avatar
npzacs committed
811

npzacs's avatar
npzacs committed
812 813 814 815 816 817 818 819 820 821
        num_uks = 0;
        ukcursor = ce->entry.uk;
        while (ukcursor && ukcursor->key_pair.key) {
            hexstring_to_hex_array(aacs->uk->uk[num_uks].key, 16, ukcursor->key_pair.key);

            BD_DEBUG(DBG_AACS, "Unit key %u from keydb entry: %s\n",
                     num_uks,
                     str_print_hex(str, aacs->uk->uk[num_uks].key, 16));

            num_uks++;
npzacs's avatar
npzacs committed
822
            ukcursor = ukcursor->next;
npzacs's avatar
npzacs committed
823
        }
npzacs's avatar
npzacs committed
824
    }
npzacs's avatar
npzacs committed
825 826
}

npzacs's avatar
npzacs committed
827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878
static size_t _read_cci_file(AACS *aacs, int cps_unit, void **data)
{
    char   *fname;
    size_t  size = 0;

    fname = str_printf("AACS" DIR_SEP "CPSUnit%05d.cci", cps_unit);
    if (fname) {
        size = _read_file(aacs, fname, data);
        X_FREE(fname);

        if (size >= 2048) {
            return size;
        }

        X_FREE(*data);
    }

    /* try backup copy */

    fname = str_printf("AACS" DIR_SEP "DUPLICATE" DIR_SEP "CPSUnit%05d.cci", cps_unit);
    if (fname) {
        size = _read_file(aacs, fname, data);
        X_FREE(fname);

        if (size >= 2048) {
            return size;
        }

        X_FREE(*data);
    }

    return 0;
}

static AACS_CCI *_read_cci(AACS *aacs, int cps_unit)
{
    AACS_CCI *cci;
    void     *data;
    size_t    size;

    size = _read_cci_file(aacs, cps_unit, &data);
    if (!size) {
        BD_DEBUG(DBG_AACS | DBG_CRIT, "Failed to read CPS unit usage file %d\n", cps_unit);
        return NULL;
    }

    cci = cci_parse(data, size);
    X_FREE(data);

    return cci;
}

879 880 881 882 883 884 885 886 887 888 889 890 891
static int _check_cci_unencrypted(AACS *aacs, int cps_unit)
{
    int result = -1;

    AACS_CCI *cci = _read_cci(aacs, cps_unit);
    if (cci) {
        result = cci_is_unencrypted(cci);
        cci_free(&cci);
    }

    return result;
}

892
static int _calc_uks(AACS *aacs, config_file *cf)
cRTrn13's avatar
openssl  
cRTrn13 committed
893
{
894
    unsigned int i;
895 896
    int error_code = AACS_SUCCESS;
    int vuk_error_code;
cRTrn13's avatar
openssl  
cRTrn13 committed
897

898 899
    uint8_t mk[16] = {0}, vuk[16] = {0};

900
    if (cf) {
npzacs's avatar
npzacs committed
901
        BD_DEBUG(DBG_AACS, "Searching for keydb config entry...\n");
902
        _find_config_entry(aacs, cf->list, mk, vuk);
903

904
        /* Skip if retrieved from config file */
npzacs's avatar
npzacs committed
905
        if (aacs->uk->uk) {
906 907
            return AACS_SUCCESS;
        }
908
    }
909

npzacs's avatar
npzacs committed
910 911 912 913 914
    if (aacs->uk->num_uk < 1) {
        /* no keys ... */
        return AACS_SUCCESS;
    }

915
    /* Try to calculate VUK */
npzacs's avatar
npzacs committed
916

917
    vuk_error_code = _calc_vuk(aacs, mk, vuk, cf);
918

npzacs's avatar
npzacs committed
919
    BD_DEBUG(DBG_AACS, "Calculate CPS unit keys...\n");
920

npzacs's avatar
npzacs committed
921 922 923
    aacs->uk->uk = calloc(aacs->uk->num_uk, sizeof(aacs->uk->uk[0]));
    if (!aacs->uk->uk) {
        BD_DEBUG(DBG_AACS | DBG_CRIT, "Out of memory\n");
npzacs's avatar
npzacs committed
924 925
        return AACS_ERROR_CORRUPTED_DISC;
    }
cRTrn13's avatar
openssl  
cRTrn13 committed
926

npzacs's avatar
npzacs committed
927
    /* decrypt unit keys */
npzacs's avatar
npzacs committed
928

npzacs's avatar
npzacs committed
929
    for (i = 0; i < aacs->uk->num_uk; i++) {
npzacs's avatar
npzacs committed
930

npzacs's avatar
npzacs committed
931 932 933 934
        /* error out if VUK calculation fails and encrypted CPS unit is found */
        if (vuk_error_code != AACS_SUCCESS) {
            if (!_check_cci_unencrypted(aacs, i + 1)) {
                error_code = vuk_error_code;
npzacs's avatar
npzacs committed
935
                break;
npzacs's avatar
npzacs committed
936
            }
npzacs's avatar
npzacs committed
937
            BD_DEBUG(DBG_AACS | DBG_CRIT, "WARNING: VUK calculation failed but disc seems to be unencrypted.\n");
938 939
        }

npzacs's avatar
npzacs committed
940
        crypto_aes128d(vuk, aacs->uk->enc_uk[i].key, aacs->uk->uk[i].key);
cRTrn13's avatar
openssl  
cRTrn13 committed
941

npzacs's avatar