aacs.c 40.8 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"
gates's avatar
gates committed
35
#include "file/file.h"
gates's avatar
gates committed
36
#include "file/keydbcfg.h"
37 38
#include "util/macro.h"
#include "util/logging.h"
39
#include "util/strutl.h"
cRTrn13's avatar
cRTrn13 committed
40

41
#include <inttypes.h>
42
#include <string.h>
43
#include <stdio.h>
npzacs's avatar
npzacs committed
44 45 46
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
47
#include <gcrypt.h>
48

npzacs's avatar
npzacs committed
49

npzacs's avatar
npzacs committed
50 51 52 53
#define SECTOR_LEN       2048  /* bus encryption block size */
#define ALIGNED_UNIT_LEN 6144  /* aacs block size */


npzacs's avatar
npzacs committed
54
struct aacs {
npzacs's avatar
npzacs committed
55 56 57
    void           *fopen_handle;
    AACS_FILE_OPEN2 fopen;

npzacs's avatar
npzacs committed
58 59 60 61 62
    /* current disc */
    char     *path;
    int       mkb_version;
    uint8_t   disc_id[20];

63 64
    /* VID is cached for BD-J */
    uint8_t   vid[16];
65 66
    /* PMSN is cached for BD-J */
    uint8_t   pmsn[16];
npzacs's avatar
npzacs committed
67 68
    /* Media key is cached for BD+ */
    uint8_t   mk[16];
npzacs's avatar
npzacs committed
69 70 71 72

    /* unit key for each CPS unit */
    uint32_t  num_uks;
    uint8_t  *uks;
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 80

    /* title -> CPS unit mappings */
    uint32_t  num_titles;
    uint16_t *cps_units;  /* [0] = first play ; [1] = top menu ; [2] = title 1 ... */
81 82 83 84

    /* bus encryption */
    int       bee;        /* bus encryption enabled flag in content certificate */
    int       bec;        /* bus encryption capable flag in drive certificate */
85
    uint8_t   read_data_key[16];
86

npzacs's avatar
npzacs committed
87 88 89
    /* content certificate */
    CONTENT_CERT *cc;

90 91 92
    /* AACS Online (BD-J) */
    uint8_t   device_nonce[16];
    uint8_t   device_binding_id[16];
npzacs's avatar
npzacs committed
93 94
};

95 96 97
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 };
98 99
static const uint8_t aacs_iv[16]   = { 0x0b, 0xa0, 0xf8, 0xdd, 0xfe, 0xa6, 0x1f, 0xb3,
                                       0xd8, 0xdf, 0x9f, 0x56, 0x6a, 0x05, 0x0f, 0x78 };
100

101 102
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
103
                        uint8_t *mk)
cRTrn13's avatar
cRTrn13 committed
104
{
105
    gcry_cipher_hd_t gcry_h;
npzacs's avatar
npzacs committed
106
    int a;
cRTrn13's avatar
cRTrn13 committed
107
    uint8_t dec_vd[16];
108
    char str[40];
cRTrn13's avatar
cRTrn13 committed
109

npzacs's avatar
npzacs committed
110
    BD_DEBUG(DBG_AACS, "Validate processing key %s...\n", str_print_hex(str, pk, 16));
npzacs's avatar
npzacs committed
111
    BD_DEBUG(DBG_AACS, " Using:\n");
npzacs's avatar
npzacs committed
112 113 114
    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));
115

116 117 118
    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);
119

cRTrn13's avatar
cRTrn13 committed
120 121 122 123
    for (a = 0; a < 4; a++) {
        mk[a + 12] ^= uv[a];
    }

124 125 126
    gcry_cipher_setkey(gcry_h, mk, 16);
    gcry_cipher_decrypt (gcry_h, dec_vd, 16, vd, 16);
    gcry_cipher_close(gcry_h);
127

cRTrn13's avatar
cRTrn13 committed
128
    if (!memcmp(dec_vd, "\x01\x23\x45\x67\x89\xAB\xCD\xEF", 8)) {
npzacs's avatar
npzacs committed
129
        BD_DEBUG(DBG_AACS, "Processing key %s is valid!\n", str_print_hex(str, pk, 16));
npzacs's avatar
npzacs committed
130
        return AACS_SUCCESS;
cRTrn13's avatar
cRTrn13 committed
131 132
    }

npzacs's avatar
npzacs committed
133
    return AACS_ERROR_NO_PK;
cRTrn13's avatar
cRTrn13 committed
134
}
135

136 137 138 139 140 141
static int _rl_verify_signature(const uint8_t *rl, size_t size)
{
    int    entries = MKINT_BE32(rl + 12 + 8);
    size_t len     = 12 + 12 + 8 * entries; /* type_and_version_rec=12, rl_header=12, rl=entries*8 */

    if (len + 40 > size) {
npzacs's avatar
npzacs committed
142
        BD_DEBUG(DBG_AACS, "revocation list size mismatch\n");
143 144 145 146 147 148
        return 0;
    }

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

149 150 151 152 153 154
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
155
        BD_DEBUG(DBG_AACS | DBG_CRIT, "ignoring empty %s\n", name);
156 157 158 159 160 161 162 163 164 165 166
        return;
    }

    if (rl_rec && version_rec) {
        rl_rec -= 4;
        rl_len += 4;

        uint8_t *data = malloc(12 + rl_len);
        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
167
          BD_DEBUG(DBG_AACS | DBG_CRIT, "invalid %s signature, not using it\n", name);
168 169 170 171 172 173 174 175
        } else {
          cache_save(name, version, data, rl_len + 12);
        }
        X_FREE(data);
    }
}

static void _update_rl(MKB *mkb)
176 177 178
{
    uint32_t version = mkb_version(mkb);
    uint32_t cache_version;
179
    size_t   rl_len;
180

181
    if (!cache_get("drl", &cache_version, NULL, NULL, 0) || cache_version < version) {
182 183
        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
184
        if (drl_rec && version_rec && rl_len > 8) {
185 186 187
            _save_rl("drl", version, version_rec, drl_rec, rl_len);
        }
    }
188
    if (!cache_get("hrl", &cache_version, NULL, NULL, 0) || cache_version < version) {
189 190
        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
191
        if (hrl_rec && version_rec && rl_len > 8) {
192
            _save_rl("hrl", version, version_rec, hrl_rec, rl_len);
193 194 195 196
        }
    }
}

197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235
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];
        if (!(uv & (1ul << i))) {
            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
236
    BD_DEBUG(DBG_AACS, "Processing key: %s\n",  str_print_hex(str, pk, 16));
237 238 239 240 241 242 243 244 245 246 247 248 249
}

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
250 251 252
        if (!dkl->uv) {
            continue;
        }
253 254 255 256 257 258 259 260 261 262 263 264
        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
265
        BD_DEBUG(DBG_AACS | DBG_CRIT, "could not find applying device key (device 0x%x)\n", device_number);
266 267
    } else {
        char str[128];
npzacs's avatar
npzacs committed
268
        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
269
        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);
270 271 272 273 274 275 276 277 278 279
        *p_dev_key_v_mask = dev_key_v_mask;
    }

    return dkl;
}

static int _calc_pk_mk(MKB *mkb, dk_list *dkl, uint8_t *mk)
{
    /* calculate processing key and media key using device keys */

npzacs's avatar
npzacs committed
280
    const uint8_t *uvs, *cvalues, *mk_dv;
281 282 283 284 285 286 287 288
    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
289 290 291 292 293 294 295 296
    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;
    }

297 298 299
    num_uvs = len / 5;

    if (num_uvs < 1) {
300
        BD_DEBUG(DBG_AACS | DBG_CRIT, "No UVS detected - corrupted disc\n");
301 302 303 304 305 306 307 308 309 310 311 312 313 314 315
        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;
        }
316
        device_number = dk_num->node;
317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332

        /* 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
333
                BD_DEBUG(DBG_AACS | DBG_CRIT, "device 0x%x is revoked\n", device_number);
334 335 336 337 338 339 340 341 342 343 344 345 346 347
                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
348
            BD_DEBUG(DBG_AACS | DBG_CRIT, "could not find applying subset-difference for device 0x%x\n", device_number);
349 350 351 352
            /* try next device */
            continue;
        }

npzacs's avatar
npzacs committed
353 354
        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);
355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376

        /* 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
377
                          mk_dv,
378 379 380
                          mk)
             == AACS_SUCCESS) {

npzacs's avatar
npzacs committed
381
            BD_DEBUG(DBG_AACS, "Media key: %s\n", str_print_hex(str, mk, 16));
382 383 384
            return AACS_SUCCESS;
        }

npzacs's avatar
npzacs committed
385
        BD_DEBUG(DBG_AACS | DBG_CRIT, "Processing key %s is invalid!\n", str_print_hex(str, pk, 16));
386 387 388 389 390 391 392

        /* try next device */
    }

    return AACS_ERROR_NO_DK;
}

npzacs's avatar
npzacs committed
393 394 395 396 397
static AACS_FILE_H *_file_open(AACS *aacs, const char *file)
{
    AACS_FILE_H *fp;
    char        *f_name;

npzacs's avatar
npzacs committed
398 399 400
    if (aacs->fopen) {
        return aacs->fopen(aacs->fopen_handle, file);
    }
npzacs's avatar
npzacs committed
401 402 403
    if (!aacs->path) {
        return NULL;
    }
npzacs's avatar
npzacs committed
404

npzacs's avatar
npzacs committed
405
    f_name = str_printf("%s" DIR_SEP "%s", aacs->path, file);
npzacs's avatar
npzacs committed
406 407 408
    if (!f_name) {
        return NULL;
    }
npzacs's avatar
npzacs committed
409 410 411 412 413 414
    fp = file_open(f_name, "rb");
    X_FREE(f_name);

    return fp;
}

npzacs's avatar
npzacs committed
415 416 417 418
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
419
    size_t size;
npzacs's avatar
npzacs committed
420 421 422 423 424 425 426 427 428

    *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
429
    f_size = file_size(fp);
npzacs's avatar
npzacs committed
430 431 432
    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
433 434 435
        file_close(fp);
        return 0;
    }
npzacs's avatar
npzacs committed
436

npzacs's avatar
npzacs committed
437
    *data = malloc(size);
npzacs's avatar
npzacs committed
438 439 440 441 442 443 444 445 446 447 448
    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
449
    return *data ? size : 0;
npzacs's avatar
npzacs committed
450 451
}

npzacs's avatar
npzacs committed
452 453
static MKB *_mkb_open(AACS *aacs)
{
npzacs's avatar
npzacs committed
454 455 456
    size_t  size;
    void   *data;
    MKB    *mkb;
npzacs's avatar
npzacs committed
457

npzacs's avatar
npzacs committed
458 459 460 461
    size = _read_file(aacs, "AACS" DIR_SEP "MKB_RO.inf", &data);
    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
462 463 464
        return NULL;
    }

npzacs's avatar
npzacs committed
465 466 467 468
    mkb = mkb_init(data, size);
    if (!mkb) {
        X_FREE(data);
    }
npzacs's avatar
npzacs committed
469 470 471
    return mkb;
}

472
static int _calc_mk(AACS *aacs, uint8_t *mk, pk_list *pkl, dk_list *dkl)
cRTrn13's avatar
keyfile  
cRTrn13 committed
473 474 475 476
{
    int a, num_uvs = 0;
    size_t len;
    MKB *mkb = NULL;
npzacs's avatar
npzacs committed
477
    const uint8_t *rec, *uvs, *mk_dv;
cRTrn13's avatar
keyfile  
cRTrn13 committed
478

479
    /* Skip if retrieved from config file */
480 481 482
    if (memcmp(mk, empty_key, 16)) {
        return AACS_SUCCESS;
    }
483

npzacs's avatar
npzacs committed
484
    BD_DEBUG(DBG_AACS, "Calculate media key...\n");
cRTrn13's avatar
cRTrn13 committed
485

npzacs's avatar
npzacs committed
486
    if ((mkb = _mkb_open(aacs))) {
487

npzacs's avatar
npzacs committed
488
        aacs->mkb_version = mkb_version(mkb);
489
        _update_rl(mkb);
490 491 492

        /* try device keys first */
        if (dkl && _calc_pk_mk(mkb, dkl, mk) == AACS_SUCCESS) {
npzacs's avatar
npzacs committed
493
            memcpy(aacs->mk, mk, sizeof(aacs->mk));
494 495 496 497
            mkb_close(mkb);
            return AACS_SUCCESS;
        }

npzacs's avatar
npzacs committed
498 499 500 501 502 503 504
        mk_dv = mkb_mk_dv(mkb);
        if (!mk_dv) {
            BD_DEBUG(DBG_AACS | DBG_CRIT, "Missing MKB DV record\n");
            mkb_close(mkb);
            return AACS_ERROR_CORRUPTED_DISC;
        }

npzacs's avatar
npzacs committed
505
        BD_DEBUG(DBG_AACS, "Get UVS...\n");
506 507 508 509 510 511 512 513
        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
514

npzacs's avatar
npzacs committed
515
        BD_DEBUG(DBG_AACS, "Get cvalues...\n");
516
        rec = mkb_cvalues(mkb, &len);
npzacs's avatar
npzacs committed
517 518 519 520 521
        if (!rec) {
            BD_DEBUG(DBG_AACS | DBG_CRIT, "Missing MKB CVALUES record\n");
            mkb_close(mkb);
            return AACS_ERROR_CORRUPTED_DISC;
        }
522

npzacs's avatar
npzacs committed
523
        for (; pkl; pkl = pkl->next) {
npzacs's avatar
npzacs committed
524
                BD_DEBUG(DBG_AACS, "Trying processing key...\n");
525 526

                for (a = 0; a < num_uvs; a++) {
npzacs's avatar
npzacs committed
527
                    if (AACS_SUCCESS == _validate_pk(pkl->key, rec + a * 16, uvs + 1 + a * 5, mk_dv, mk)) {
528
                        mkb_close(mkb);
529

530
                        char str[40];
npzacs's avatar
npzacs committed
531
                        BD_DEBUG(DBG_AACS, "Media key: %s\n", str_print_hex(str, mk, 16));
npzacs's avatar
npzacs committed
532
                        memcpy(aacs->mk, mk, sizeof(aacs->mk));
npzacs's avatar
npzacs committed
533
                        return AACS_SUCCESS;
534 535
                    }
                }
cRTrn13's avatar
keyfile  
cRTrn13 committed
536 537
            }

538
        mkb_close(mkb);
cRTrn13's avatar
keyfile  
cRTrn13 committed
539

npzacs's avatar
npzacs committed
540
        BD_DEBUG(DBG_AACS | DBG_CRIT, "Error calculating media key. Missing right processing key ?\n");
npzacs's avatar
npzacs committed
541
        return AACS_ERROR_NO_PK;
npzacs's avatar
npzacs committed
542
    }
npzacs's avatar
npzacs committed
543

544
    BD_DEBUG(DBG_AACS | DBG_CRIT, "Error calculating media key - corrupted disc\n");
npzacs's avatar
npzacs committed
545
    return AACS_ERROR_CORRUPTED_DISC;
cRTrn13's avatar
keyfile  
cRTrn13 committed
546
}
547

npzacs's avatar
npzacs committed
548
static int _mmc_read_auth(AACS *aacs, cert_list *hcl, int type, uint8_t *p1, uint8_t *p2)
cRTrn13's avatar
openssl  
cRTrn13 committed
549
{
cRTrn13's avatar
cRTrn13 committed
550
    MMC* mmc = NULL;
npzacs's avatar
npzacs committed
551
    if (!(mmc = mmc_open(aacs->path))) {
npzacs's avatar
npzacs committed
552
        return AACS_ERROR_MMC_OPEN;
553 554
    }

npzacs's avatar
npzacs committed
555 556
    int error_code = AACS_ERROR_NO_CERT;

557
    const uint8_t *drive_cert = mmc_get_drive_cert(mmc);
558

npzacs's avatar
npzacs committed
559
    for (; hcl ; hcl = hcl->next) {
560 561 562

        char tmp_str[2*92+1];

npzacs's avatar
npzacs committed
563
        if (!crypto_aacs_verify_host_cert(hcl->host_cert)) {
npzacs's avatar
npzacs committed
564
            BD_DEBUG(DBG_AACS, "Not using invalid host certificate %s.\n",
npzacs's avatar
npzacs committed
565
                  str_print_hex(tmp_str, hcl->host_cert, 92));
npzacs's avatar
npzacs committed
566 567
            continue;
        }
568

npzacs's avatar
npzacs committed
569
        if (drive_cert && (drive_cert[1] & 0x01) && !(hcl->host_cert[1] & 0x01)) {
npzacs's avatar
npzacs committed
570
            BD_DEBUG(DBG_AACS, "Certificate (id 0x%s) does not support bus encryption\n",
npzacs's avatar
npzacs committed
571
                  str_print_hex(tmp_str, hcl->host_cert + 4, 6));
572 573 574
            //continue;
        }

npzacs's avatar
npzacs committed
575
        BD_DEBUG(DBG_AACS, "Trying host certificate (id 0x%s)...\n",
npzacs's avatar
npzacs committed
576
              str_print_hex(tmp_str, hcl->host_cert + 4, 6));
577

npzacs's avatar
npzacs committed
578
        int mmc_result = mmc_read_auth(mmc, hcl->host_priv_key, hcl->host_cert, type, p1, p2);
npzacs's avatar
npzacs committed
579 580 581 582 583 584 585 586 587 588 589
        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;
590 591 592 593 594
        }
    }

    mmc_close(mmc);

npzacs's avatar
npzacs committed
595
    return error_code;
596
}
cRTrn13's avatar
openssl  
cRTrn13 committed
597

npzacs's avatar
npzacs committed
598
static int _read_vid(AACS *aacs, cert_list *hcl)
599
{
npzacs's avatar
npzacs committed
600 601 602
    /* Use VID given in config file if available */
    if (memcmp(aacs->vid, empty_key, 16)) {
        return AACS_SUCCESS;
603 604
    }

npzacs's avatar
npzacs committed
605 606
    int error_code = _mmc_read_auth(aacs, hcl, MMC_READ_VID, aacs->vid, NULL);
    if (error_code != AACS_SUCCESS) {
npzacs's avatar
npzacs committed
607
        BD_DEBUG(DBG_AACS, "Error reading VID!\n");
npzacs's avatar
npzacs committed
608 609 610
    } else {
        /* cache vid */
        keycache_save("vid", aacs->disc_id, aacs->vid, 16);
611 612 613 614
    }
    return error_code;
}

npzacs's avatar
npzacs committed
615
static int _read_read_data_key(AACS *aacs, cert_list *hcl)
Janusz Dziemidowicz's avatar
Janusz Dziemidowicz committed
616
{
npzacs's avatar
npzacs committed
617 618
    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
619
        BD_DEBUG(DBG_AACS, "Error reading data keys!\n");
Janusz Dziemidowicz's avatar
Janusz Dziemidowicz committed
620
    }
npzacs's avatar
npzacs committed
621 622
    return error_code;
}
Janusz Dziemidowicz's avatar
Janusz Dziemidowicz committed
623

npzacs's avatar
npzacs committed
624 625 626 627
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
628
        BD_DEBUG(DBG_AACS, "Error reading PMSN!\n");
Janusz Dziemidowicz's avatar
Janusz Dziemidowicz committed
629 630 631 632
    }
    return error_code;
}

633
static int _calc_vuk(AACS *aacs, uint8_t *mk, uint8_t *vuk, config_file *cf)
634
{
npzacs's avatar
npzacs committed
635 636
    int error_code;

637
    /* Skip if retrieved from config file */
638
    if (memcmp(vuk, empty_key, 16)) {
npzacs's avatar
npzacs committed
639
        BD_DEBUG(DBG_AACS, "Using VUK from config file\n");
npzacs's avatar
npzacs committed
640 641
        return AACS_SUCCESS;
    }
642

npzacs's avatar
npzacs committed
643
    /* get cached vuk */
644
    if (keycache_find("vuk", aacs->disc_id, vuk, 16)) {
npzacs's avatar
npzacs committed
645
        BD_DEBUG(DBG_AACS, "Using cached VUK\n");
npzacs's avatar
npzacs committed
646
        return AACS_SUCCESS;
npzacs's avatar
npzacs committed
647 648
    }

649 650 651 652
    if (!cf) {
        return AACS_ERROR_NO_CONFIG;
    }

653
    /* make sure we have media key */
654
    error_code = _calc_mk(aacs, mk, cf->pkl, cf->dkl);
npzacs's avatar
npzacs committed
655 656
    if (error_code != AACS_SUCCESS) {
        return error_code;
657 658
    }

npzacs's avatar
npzacs committed
659
    /* acquire VID */
660
    error_code = _read_vid(aacs, cf->host_cert_list);
npzacs's avatar
npzacs committed
661 662 663
    if (error_code != AACS_SUCCESS) {
        return error_code;
    }
664

npzacs's avatar
npzacs committed
665
    /* calculate VUK */
666

npzacs's avatar
npzacs committed
667
    crypto_aes128d(mk, aacs->vid, vuk);
668

npzacs's avatar
npzacs committed
669
    int a;
npzacs's avatar
npzacs committed
670
    for (a = 0; a < 16; a++) {
671
        vuk[a] ^= aacs->vid[a];
npzacs's avatar
npzacs committed
672
    }
673

npzacs's avatar
npzacs committed
674
    char str[40];
npzacs's avatar
npzacs committed
675
    BD_DEBUG(DBG_AACS, "Volume unique key: %s\n", str_print_hex(str, vuk, 16));
676

npzacs's avatar
npzacs committed
677
    /* cache vuk */
678
    keycache_save("vuk", aacs->disc_id, vuk, 16);
npzacs's avatar
npzacs committed
679

npzacs's avatar
npzacs committed
680
    return AACS_SUCCESS;
cRTrn13's avatar
openssl  
cRTrn13 committed
681 682
}

683 684
static uint16_t _read_u16(AACS_FILE_H *fp)
{
npzacs's avatar
npzacs committed
685
  uint8_t data[2] = {0, 0};
686 687 688 689 690 691 692 693 694 695 696

  file_read(fp, data, sizeof(uint16_t));

  return MKINT_BE16(data);
}

static void _read_uks_map(AACS *aacs, AACS_FILE_H *fp)
{
    uint16_t first_play, top_menu;
    unsigned i;

npzacs's avatar
npzacs committed
697
    BD_DEBUG(DBG_AACS, "Assigning CPS units to titles ...\n");
698 699 700 701 702 703 704 705 706

    X_FREE(aacs->cps_units);
    aacs->current_cps_unit = 0;

    file_seek(fp, 16 + 4, SEEK_SET);

    first_play = _read_u16(fp);
    top_menu   = _read_u16(fp);

npzacs's avatar
npzacs committed
707 708
    BD_DEBUG(DBG_AACS, "Title FP : CPS unit %d\n", first_play);
    BD_DEBUG(DBG_AACS, "Title TM : CPS unit %d\n", top_menu);
709 710 711 712 713 714 715 716 717

    aacs->num_titles   = _read_u16(fp);
    aacs->cps_units    = calloc(sizeof(uint16_t), aacs->num_titles + 2);
    aacs->cps_units[0] = first_play;
    aacs->cps_units[1] = top_menu;

    for (i = 2; i < aacs->num_titles + 2; i++) {
        _read_u16(fp); /* reserved */
        aacs->cps_units[i] = _read_u16(fp);
npzacs's avatar
npzacs committed
718
        BD_DEBUG(DBG_AACS, "Title %02d : CPS unit %d\n", i - 1, aacs->cps_units[i]);
719 720 721 722 723 724 725
    }

    /* validate */
    for (i = 0; i < aacs->num_titles + 2; i++) {
        if (aacs->cps_units[i])
            aacs->cps_units[i]--; /* number [1...N] --> index [0...N-1] */
        if (aacs->cps_units[i] >= aacs->num_uks) {
npzacs's avatar
npzacs committed
726
            BD_DEBUG(DBG_AACS, " *** Invalid CPS unit for title %d: %d !\n", (int) i - 1, aacs->cps_units[i]);
727 728 729 730 731
            aacs->cps_units[i] = 0;
        }
    }
}

npzacs's avatar
npzacs committed
732
/* Function that collects keys from keydb config entry */
733 734
static void _find_config_entry(AACS *aacs, title_entry_list *ce,
                               uint8_t *mk, uint8_t *vuk)
npzacs's avatar
npzacs committed
735 736
{
    char str[48];
737
    char str2[48];
npzacs's avatar
npzacs committed
738 739 740 741 742

    aacs->uks = NULL;
    aacs->num_uks = 0;

        while (ce && ce->entry.discid) {
npzacs's avatar
npzacs committed
743
            if (!memcmp(aacs->disc_id, ce->entry.discid, 20)) {
npzacs's avatar
npzacs committed
744
                BD_DEBUG(DBG_AACS, "Found config entry for discid %s\n",
npzacs's avatar
npzacs committed
745
                      str_print_hex(str, ce->entry.discid, 20));
npzacs's avatar
npzacs committed
746 747 748 749 750 751 752 753 754 755
                break;
            }

            ce = ce->next;
        }
        if (!ce) {
            return;
        }

        if (ce->entry.mek) {
756
            hexstring_to_hex_array(mk, 16, ce->entry.mek);
npzacs's avatar
npzacs committed
757

npzacs's avatar
npzacs committed
758
            BD_DEBUG(DBG_AACS, "Found media key for %s: %s\n",
759
                  str_print_hex(str2, ce->entry.discid, 20), str_print_hex(str, mk, 16));
npzacs's avatar
npzacs committed
760 761 762 763 764 765
        }

        if (ce->entry.vid) {
            hexstring_to_hex_array(aacs->vid, sizeof(aacs->vid),
                                    ce->entry.vid);

npzacs's avatar
npzacs committed
766
            BD_DEBUG(DBG_AACS, "Found volume id for %s: %s\n",
767
                  str_print_hex(str2, ce->entry.discid, 20), str_print_hex(str, aacs->vid, 16));
npzacs's avatar
npzacs committed
768 769 770
        }

        if (ce->entry.vuk) {
771
            hexstring_to_hex_array(vuk, 16, ce->entry.vuk);
npzacs's avatar
npzacs committed
772

npzacs's avatar
npzacs committed
773
            BD_DEBUG(DBG_AACS, "Found volume unique key for %s: %s\n",
774
                  str_print_hex(str2, ce->entry.discid, 20), str_print_hex(str, vuk, 16));
npzacs's avatar
npzacs committed
775 776 777
        }

        if (ce->entry.uk) {
npzacs's avatar
npzacs committed
778
            BD_DEBUG(DBG_AACS, "Acquire CPS unit keys from keydb config file...\n");
npzacs's avatar
npzacs committed
779 780 781 782 783 784 785 786 787

            digit_key_pair_list *ukcursor = ce->entry.uk;
            while (ukcursor && ukcursor->key_pair.key) {
                aacs->num_uks++;

                aacs->uks = (uint8_t*)realloc(aacs->uks, 16 * aacs->num_uks);
                hexstring_to_hex_array(aacs->uks + (16 * (aacs->num_uks - 1)), 16,
                                      ukcursor->key_pair.key);

npzacs's avatar
npzacs committed
788
                BD_DEBUG(DBG_AACS, "Unit key %d from keydb entry: %s\n",
npzacs's avatar
npzacs committed
789
                      aacs->num_uks,
npzacs's avatar
npzacs committed
790
                      str_print_hex(str, aacs->uks + (16 * (aacs->num_uks - 1)), 16));
npzacs's avatar
npzacs committed
791 792 793 794 795 796

                ukcursor = ukcursor->next;
            }
        }
}

npzacs's avatar
npzacs committed
797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848
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;
}

849 850 851 852 853 854 855 856 857 858 859 860 861
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;
}

862
static int _calc_uks(AACS *aacs, config_file *cf)
cRTrn13's avatar
openssl  
cRTrn13 committed
863
{
864
    AACS_FILE_H *fp = NULL;
865
    uint8_t  buf[16];
866
    uint64_t f_pos;
867
    unsigned int i;
868 869
    int error_code = AACS_SUCCESS;
    int vuk_error_code;
cRTrn13's avatar
openssl  
cRTrn13 committed
870

871 872
    uint8_t mk[16] = {0}, vuk[16] = {0};

873
    if (cf) {
npzacs's avatar
npzacs committed
874
        BD_DEBUG(DBG_AACS, "Searching for keydb config entry...\n");
875
        _find_config_entry(aacs, cf->list, mk, vuk);
876

877 878 879 880
        /* Skip if retrieved from config file */
        if (aacs->uks) {
            return AACS_SUCCESS;
        }
881
    }
882

883 884
    /* Try to calculate VUK */
    vuk_error_code = _calc_vuk(aacs, mk, vuk, cf);
885

npzacs's avatar
npzacs committed
886
    BD_DEBUG(DBG_AACS, "Calculate CPS unit keys...\n");
887

npzacs's avatar
npzacs committed
888
    fp = _file_open(aacs, "AACS" DIR_SEP "Unit_Key_RO.inf");
npzacs's avatar
npzacs committed
889
    if (!fp) {
npzacs's avatar
npzacs committed
890
        BD_DEBUG(DBG_AACS | DBG_CRIT, "Error opening unit key file (AACS/Unit_Key_RO.inf)\n");
npzacs's avatar
npzacs committed
891 892
        return AACS_ERROR_CORRUPTED_DISC;
    }
cRTrn13's avatar
openssl  
cRTrn13 committed
893

npzacs's avatar
npzacs committed
894 895
    if ((file_read(fp, buf, 4)) == 4) {
        f_pos = MKINT_BE32(buf);
npzacs's avatar
npzacs committed
896

npzacs's avatar
npzacs committed
897 898 899 900
        // Read number of keys
        file_seek(fp, f_pos, SEEK_SET);
        if ((file_read(fp, buf, 2)) == 2) {
            aacs->num_uks = MKINT_BE16(buf);
npzacs's avatar
npzacs committed
901

npzacs's avatar
npzacs committed
902 903
            X_FREE(aacs->uks);
            aacs->uks = calloc(aacs->num_uks, 16);
npzacs's avatar
npzacs committed
904

npzacs's avatar
npzacs committed
905
            BD_DEBUG(DBG_AACS, "%d CPS unit keys\n", aacs->num_uks);
npzacs's avatar
npzacs committed
906

npzacs's avatar
npzacs committed
907 908
        } else {
            aacs->num_uks = 0;
npzacs's avatar
npzacs committed
909
            BD_DEBUG(DBG_AACS | DBG_CRIT, "Error reading number of unit keys\n");
npzacs's avatar
npzacs committed
910 911
            error_code = AACS_ERROR_CORRUPTED_DISC;
        }
cRTrn13's avatar
openssl  
cRTrn13 committed
912

npzacs's avatar
npzacs committed
913 914
        // Read keys
        for (i = 0; i < aacs->num_uks; i++) {
cRTrn13's avatar
openssl  
cRTrn13 committed
915

916
            /* error out if VUK calculation fails and encrypted CPS unit is found */
917 918 919 920 921 922
            if (vuk_error_code != AACS_SUCCESS) {
                if (!_check_cci_unencrypted(aacs, i + 1)) {
                    error_code = vuk_error_code;
                    break;
                }
                BD_DEBUG(DBG_AACS | DBG_CRIT, "WARNING: VUK calculation failed but disc seems to be unencrypted.\n");
923 924 925
            }

            f_pos += 48;
npzacs's avatar
npzacs committed
926