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nxdumptool/source/core/tik.c
Pablo Curiel fc5226bfce [skip ci] Update copyright year.
2024-04-12 11:49:03 +02:00

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/*
* tik.c
*
* Copyright (c) 2019-2020, shchmue.
* Copyright (c) 2020-2024, DarkMatterCore <pabloacurielz@gmail.com>.
*
* This file is part of nxdumptool (https://github.com/DarkMatterCore/nxdumptool).
*
* nxdumptool is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* nxdumptool is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "nxdt_utils.h"
#include "nca.h"
#include "cert.h"
#include "save.h"
#include "es.h"
#include "keys.h"
#include "gamecard.h"
#include "mem.h"
#include "aes.h"
#include "rsa.h"
#define TIK_COMMON_SAVEFILE_PATH BIS_SYSTEM_PARTITION_MOUNT_NAME "/save/80000000000000e1"
#define TIK_PERSONALIZED_SAVEFILE_PATH BIS_SYSTEM_PARTITION_MOUNT_NAME "/save/80000000000000e2"
#define TIK_LIST_STORAGE_PATH "/ticket_list.bin"
#define TIK_DB_STORAGE_PATH "/ticket.bin"
#define TIK_COMMON_CERT_NAME "XS00000020"
#define TIK_DEV_CERT_ISSUER "CA00000004"
/* Type definitions. */
/// Used to parse ticket_list.bin entries.
typedef struct {
FsRightsId rights_id;
u64 ticket_id;
u32 account_id;
u8 reserved[0x04];
} TikListEntry;
NXDT_ASSERT(TikListEntry, 0x20);
/// 9.x+ CTR key entry in ES .data segment. Used to store CTR key/IV data for encrypted volatile tickets in ticket.bin and/or encrypted entries in ticket_list.bin.
/// This is always stored in pairs. The first entry holds the key/IV for the encrypted volatile ticket, while the second entry holds the key/IV for the encrypted entry in ticket_list.bin.
/// First index in this list is always 0.
typedef struct {
u32 idx; ///< Entry index.
u8 key[AES_128_KEY_SIZE]; ///< AES-128-CTR key.
u8 ctr[AES_128_KEY_SIZE]; ///< AES-128-CTR counter/IV. Always zeroed out.
} TikEsCtrKeyEntry9x;
NXDT_ASSERT(TikEsCtrKeyEntry9x, 0x24);
/// Lookup pattern for TikEsCtrKeyEntry9x.
typedef struct {
u32 idx1; ///< Always set to 0 (first entry).
u8 ctrdata[AES_128_KEY_SIZE * 2];
u32 idx2; ///< Always set to 1 (second entry).
} TikEsCtrKeyPattern9x;
NXDT_ASSERT(TikEsCtrKeyPattern9x, 0x28);
/* Global variables. */
static Mutex g_esTikSaveMutex = 0;
#if LOG_LEVEL <= LOG_LEVEL_ERROR
static const char *g_tikTitleKeyTypeStrings[] = {
[TikTitleKeyType_Common] = "common",
[TikTitleKeyType_Personalized] = "personalized"
};
#endif
static MemoryLocation g_esMemoryLocation = {
.program_id = ES_SYSMODULE_TID,
.mask = 0,
.data = NULL,
.data_size = 0
};
/* Function prototypes. */
static bool tikRetrieveTicketFromGameCardByRightsId(Ticket *dst, const FsRightsId *id);
static bool tikRetrieveTicketFromEsSaveDataByRightsId(Ticket *dst, const FsRightsId *id);
static bool tikFixTamperedCommonTicket(Ticket *tik);
static bool tikVerifyRsa2048Sha256Signature(const TikCommonBlock *tik_common_block, u64 hash_area_size, const u8 *signature);
static bool tikGetEncryptedTitleKey(Ticket *tik);
static bool tikGetDecryptedTitleKey(void *dst, const void *src, u8 key_generation);
static bool tikGetTitleKeyTypeFromRightsId(const FsRightsId *id, u8 *out);
static bool tikRetrieveRightsIdsByTitleKeyType(FsRightsId **out, u32 *out_count, bool personalized);
static bool tikGetTicketEntryOffsetFromTicketList(save_ctx_t *save_ctx, u8 *buf, u64 buf_size, const FsRightsId *id, u8 titlekey_type, u64 *out_offset);
static bool tikRetrieveTicketEntryFromTicketBin(save_ctx_t *save_ctx, u8 *buf, u64 buf_size, const FsRightsId *id, u8 titlekey_type, u64 ticket_offset);
static bool tikDecryptVolatileTicket(u8 *buf, u64 ticket_offset);
static bool tikGetTicketTypeAndSize(void *data, u64 data_size, u8 *out_type, u64 *out_size);
bool tikRetrieveTicketByRightsId(Ticket *dst, const FsRightsId *id, u8 key_generation, bool use_gamecard)
{
if (!dst || !id || key_generation > NcaKeyGeneration_Max)
{
LOG_MSG_ERROR("Invalid parameters!");
return false;
}
TikCommonBlock *tik_common_block = NULL;
bool success = false, tik_retrieved = false;
LOG_DATA_INFO(id->c, sizeof(id->c), "Input rights ID:");
/* Check if this ticket has already been retrieved. */
tik_common_block = tikGetCommonBlockFromTicket(dst);
if (tik_common_block && !memcmp(tik_common_block->rights_id.c, id->c, sizeof(id->c)))
{
success = true;
goto end;
}
/* Clear output ticket. */
memset(dst, 0, sizeof(Ticket));
/* Validate the key generation field within the rights ID. */
u8 key_gen_rid = id->c[0xF];
bool old_key_gen = (key_generation < NcaKeyGeneration_Since301NUP);
if ((old_key_gen && key_gen_rid) || (!old_key_gen && key_gen_rid != key_generation))
{
LOG_MSG_ERROR("Invalid rights ID key generation! Got 0x%02X, expected 0x%02X.", key_gen_rid, old_key_gen ? 0 : key_generation);
goto end;
}
/* Update key generation field. */
dst->key_generation = key_generation;
/* Retrieve ticket data. */
if (use_gamecard)
{
tik_retrieved = tikRetrieveTicketFromGameCardByRightsId(dst, id);
} else {
SCOPED_LOCK(&g_esTikSaveMutex) tik_retrieved = tikRetrieveTicketFromEsSaveDataByRightsId(dst, id);
}
if (!tik_retrieved)
{
LOG_MSG_ERROR("Unable to retrieve ticket data!");
goto end;
}
/* Fix tampered common ticket, if needed. */
if (!tikFixTamperedCommonTicket(dst)) goto end;
/* Get encrypted titlekey. */
if (!tikGetEncryptedTitleKey(dst))
{
LOG_MSG_ERROR("Unable to retrieve encrypted titlekey from ticket!");
goto end;
}
/* Get decrypted titlekey. */
if (!(success = tikGetDecryptedTitleKey(dst->dec_titlekey, dst->enc_titlekey, dst->key_generation)))
{
LOG_MSG_ERROR("Unable to decrypt titlekey!");
goto end;
}
/* Generate hex strings. */
tik_common_block = tikGetCommonBlockFromSignedTicketBlob(dst->data);
utilsGenerateHexString(dst->enc_titlekey_str, sizeof(dst->enc_titlekey_str), dst->enc_titlekey, sizeof(dst->enc_titlekey), false);
utilsGenerateHexString(dst->dec_titlekey_str, sizeof(dst->dec_titlekey_str), dst->dec_titlekey, sizeof(dst->dec_titlekey), false);
utilsGenerateHexString(dst->rights_id_str, sizeof(dst->rights_id_str), tik_common_block->rights_id.c, sizeof(tik_common_block->rights_id.c), false);
end:
return success;
}
bool tikConvertPersonalizedTicketToCommonTicket(Ticket *tik, u8 **out_raw_cert_chain, u64 *out_raw_cert_chain_size)
{
TikCommonBlock *tik_common_block = NULL;
u32 sig_type = 0;
u8 *signature = NULL;
u64 signature_size = 0;
bool dev_cert = false;
char cert_chain_issuer[0x40] = {0};
u8 *raw_cert_chain = NULL;
u64 raw_cert_chain_size = 0;
if (!(tik_common_block = tikGetCommonBlockFromTicket(tik)) || tik_common_block->titlekey_type != TikTitleKeyType_Personalized || \
(!out_raw_cert_chain && out_raw_cert_chain_size) || (out_raw_cert_chain && !out_raw_cert_chain_size))
{
LOG_MSG_ERROR("Invalid parameters!");
return false;
}
/* Generate raw certificate chain for the new signature issuer (common). */
dev_cert = (strstr(tik_common_block->issuer, TIK_DEV_CERT_ISSUER) != NULL);
sprintf(cert_chain_issuer, "Root-CA%08X-%s", dev_cert ? 4 : 3, TIK_COMMON_CERT_NAME);
raw_cert_chain = certGenerateRawCertificateChainBySignatureIssuer(cert_chain_issuer, &raw_cert_chain_size);
if (!raw_cert_chain)
{
LOG_MSG_ERROR("Failed to generate raw certificate chain for common ticket signature issuer!");
return false;
}
/* Wipe signature. */
sig_type = signatureGetTypeFromSignedBlob(tik->data, false);
signature = signatureGetSigFromSignedBlob(tik->data);
signature_size = signatureGetSigSizeByType(sig_type);
memset(signature, 0xFF, signature_size);
/* Change signature issuer. */
memset(tik_common_block->issuer, 0, sizeof(tik_common_block->issuer));
sprintf(tik_common_block->issuer, "%s", cert_chain_issuer);
/* Wipe the titlekey block and copy the encrypted titlekey to it. */
memset(tik_common_block->titlekey_block, 0, sizeof(tik_common_block->titlekey_block));
memcpy(tik_common_block->titlekey_block, tik->enc_titlekey, sizeof(tik->enc_titlekey));
/* Update ticket size. */
tik->size = (signatureGetBlockSizeByType(sig_type) + sizeof(TikCommonBlock));
/* Update the rest of the ticket fields. */
tik_common_block->titlekey_type = TikTitleKeyType_Common;
tik_common_block->license_type = TikLicenseType_Permanent;
tik_common_block->property_mask = TikPropertyMask_None;
tik_common_block->ticket_id = 0;
tik_common_block->device_id = 0;
tik_common_block->account_id = 0;
tik_common_block->sect_total_size = 0;
tik_common_block->sect_hdr_offset = (u32)tik->size;
tik_common_block->sect_hdr_count = 0;
tik_common_block->sect_hdr_entry_size = 0;
memset(tik->data + tik->size, 0, SIGNED_TIK_MAX_SIZE - tik->size);
/* Update output pointers. */
if (out_raw_cert_chain)
{
*out_raw_cert_chain = raw_cert_chain;
} else {
free(raw_cert_chain);
}
if (out_raw_cert_chain_size) *out_raw_cert_chain_size = raw_cert_chain_size;
return true;
}
static bool tikRetrieveTicketFromGameCardByRightsId(Ticket *dst, const FsRightsId *id)
{
if (!dst || !id)
{
LOG_MSG_ERROR("Invalid parameters!");
return false;
}
char tik_filename[0x30] = {0};
u64 tik_offset = 0, tik_size = 0;
bool success = false;
utilsGenerateHexString(tik_filename, sizeof(tik_filename), id->c, sizeof(id->c), false);
strcat(tik_filename, ".tik");
/* Get ticket entry info. */
if (!gamecardGetHashFileSystemEntryInfoByName(HashFileSystemPartitionType_Secure, tik_filename, &tik_offset, &tik_size))
{
LOG_MSG_ERROR("Error retrieving offset and size for \"%s\" entry in secure hash FS partition!", tik_filename);
goto end;
}
/* Validate ticket size. */
if (tik_size < SIGNED_TIK_MIN_SIZE || tik_size > SIGNED_TIK_MAX_SIZE)
{
LOG_MSG_ERROR("Invalid size for \"%s\"! (0x%lX).", tik_filename, tik_size);
goto end;
}
/* Read ticket data. */
if (!gamecardReadStorage(dst->data, tik_size, tik_offset))
{
LOG_MSG_ERROR("Failed to read \"%s\" data from the inserted gamecard!", tik_filename);
goto end;
}
/* Get ticket type and size. */
if (!(success = tikGetTicketTypeAndSize(dst->data, tik_size, &(dst->type), &(dst->size)))) LOG_MSG_ERROR("Unable to determine ticket type and size!");
end:
return success;
}
static bool tikRetrieveTicketFromEsSaveDataByRightsId(Ticket *dst, const FsRightsId *id)
{
if (!dst || !id)
{
LOG_MSG_ERROR("Invalid parameters!");
return false;
}
u8 titlekey_type = 0;
save_ctx_t *save_ctx = NULL;
u64 buf_size = (SIGNED_TIK_MAX_SIZE * 0x100);
u8 *buf = NULL;
u64 ticket_offset = 0;
bool success = false;
/* Allocate memory to retrieve the ticket. */
if (!(buf = malloc(buf_size)))
{
LOG_MSG_ERROR("Unable to allocate 0x%lX bytes block for temporary read buffer!", buf_size);
goto end;
}
/* Get titlekey type. */
if (!tikGetTitleKeyTypeFromRightsId(id, &titlekey_type))
{
LOG_MSG_ERROR("Unable to retrieve ticket titlekey type!");
goto end;
}
/* Open ES common/personalized system savefile. */
if (!(save_ctx = save_open_savefile(titlekey_type == TikTitleKeyType_Common ? TIK_COMMON_SAVEFILE_PATH : TIK_PERSONALIZED_SAVEFILE_PATH, 0)))
{
LOG_MSG_ERROR("Failed to open ES %s ticket system savefile!", g_tikTitleKeyTypeStrings[titlekey_type]);
goto end;
}
/* Get ticket entry offset from ticket_list.bin. */
if (!tikGetTicketEntryOffsetFromTicketList(save_ctx, buf, buf_size, id, titlekey_type, &ticket_offset))
{
LOG_MSG_ERROR("Unable to find an entry with a matching Rights ID in \"%s\" from ES %s ticket system save!", TIK_LIST_STORAGE_PATH, g_tikTitleKeyTypeStrings[titlekey_type]);
goto end;
}
/* Get ticket entry from ticket.bin. */
if (!tikRetrieveTicketEntryFromTicketBin(save_ctx, buf, buf_size, id, titlekey_type, ticket_offset))
{
LOG_MSG_ERROR("Unable to find a matching %s ticket entry for the provided Rights ID!", g_tikTitleKeyTypeStrings[titlekey_type]);
goto end;
}
/* Get ticket type and size. */
if (!(success = tikGetTicketTypeAndSize(buf, SIGNED_TIK_MAX_SIZE, &(dst->type), &(dst->size))))
{
LOG_MSG_ERROR("Unable to determine ticket type and size!");
goto end;
}
/* Copy ticket data. */
memcpy(dst->data, buf, dst->size);
end:
if (save_ctx) save_close_savefile(save_ctx);
if (buf) free(buf);
return success;
}
static bool tikFixTamperedCommonTicket(Ticket *tik)
{
TikCommonBlock *tik_common_block = NULL;
u32 sig_type = 0;
bool dev_cert = false;
TikSigRsa2048 *tik_data = NULL;
u64 hash_area_size = 0;
bool success = false;
if (!tik || tik->key_generation > NcaKeyGeneration_Max || !(tik_common_block = tikGetCommonBlockFromSignedTicketBlob(tik->data)))
{
LOG_MSG_ERROR("Invalid parameters!");
return false;
}
/* Get ticket signature type. Also determine if it's a development ticket. */
sig_type = signatureGetTypeFromSignedBlob(tik->data, false);
dev_cert = (strstr(tik_common_block->issuer, TIK_DEV_CERT_ISSUER) != NULL);
/* Return right away if we're not dealing with a common ticket or if the signature type doesn't match RSA-2048 + SHA-256. */
if (tik_common_block->titlekey_type != TikTitleKeyType_Common || sig_type != SignatureType_Rsa2048Sha256)
{
success = true;
goto end;
}
/* Make sure we're dealing with a tampered ticket by verifying its signature. */
tik_data = (TikSigRsa2048*)tik->data;
tik_common_block = &(tik_data->tik_common_block);
hash_area_size = tikGetSignedTicketBlobHashAreaSize(tik->data);
if (tikVerifyRsa2048Sha256Signature(tik_common_block, hash_area_size, tik_data->sig_block.signature))
{
success = true;
goto end;
}
LOG_MSG_DEBUG("Detected tampered common ticket!");
/* Nintendo didn't start putting the key generation value into the rights ID until HOS 3.0.1. */
/* Old custom tools used to wipe the key generation field and/or save its value into a different offset. */
/* We're gonna take care of that by setting the correct values where they need to go. */
memset(tik_data->sig_block.signature, 0xFF, sizeof(tik_data->sig_block.signature));
memset(tik_data->sig_block.padding, 0, sizeof(tik_data->sig_block.padding));
memset(tik_common_block->issuer, 0, sizeof(tik_common_block->issuer));
sprintf(tik_common_block->issuer, "Root-CA%08X-%s", dev_cert ? 4 : 3, TIK_COMMON_CERT_NAME);
memset(tik_common_block->titlekey_block + 0x10, 0, sizeof(tik_common_block->titlekey_block) - 0x10);
tik_common_block->format_version = TIK_FORMAT_VERSION;
tik_common_block->titlekey_type = TikTitleKeyType_Common;
tik_common_block->ticket_version = 0;
tik_common_block->license_type = TikLicenseType_Permanent;
tik_common_block->key_generation = tik->key_generation;
tik_common_block->property_mask = TikPropertyMask_None;
memset(tik_common_block->reserved, 0, sizeof(tik_common_block->reserved));
tik_common_block->ticket_id = 0;
tik_common_block->device_id = 0;
tik_common_block->account_id = 0;
tik_common_block->sect_total_size = 0;
tik_common_block->sect_hdr_offset = (u32)sizeof(TikSigRsa2048);
tik_common_block->sect_hdr_count = 0;
tik_common_block->sect_hdr_entry_size = 0;
/* Update ticket size. */
tik->size = sizeof(TikSigRsa2048);
/* Update return value. */
success = true;
end:
return success;
}
static bool tikVerifyRsa2048Sha256Signature(const TikCommonBlock *tik_common_block, u64 hash_area_size, const u8 *signature)
{
if (!tik_common_block || hash_area_size < sizeof(TikCommonBlock) || hash_area_size > (SIGNED_TIK_MAX_SIZE - sizeof(SignatureBlockRsa2048)) || !signature)
{
LOG_MSG_ERROR("Invalid parameters!");
return false;
}
Certificate cert = {0};
const char *cert_name = (strrchr(tik_common_block->issuer, '-') + 1);
const u8 *modulus = NULL, *public_exponent = NULL;
/* Get certificate for the ticket signature issuer. */
if (!certRetrieveCertificateByName(&cert, cert_name))
{
LOG_MSG_ERROR("Failed to retrieve certificate for \"%s\".", cert_name);
return false;
}
/* Get certificate modulus and public exponent. */
modulus = certGetPublicKeyFromCertificate(&cert);
public_exponent = certGetPublicExponentFromCertificate(&cert);
/* Validate the ticket signature. */
return rsa2048VerifySha256BasedPkcs1v15Signature(tik_common_block, hash_area_size, signature, modulus, public_exponent, CERT_RSA_PUB_EXP_SIZE);
}
static bool tikGetEncryptedTitleKey(Ticket *tik)
{
TikCommonBlock *tik_common_block = NULL;
if (!tik || !(tik_common_block = tikGetCommonBlockFromSignedTicketBlob(tik->data)))
{
LOG_MSG_ERROR("Invalid parameters!");
return false;
}
bool success = false;
switch(tik_common_block->titlekey_type)
{
case TikTitleKeyType_Common:
/* No console-specific crypto used. Copy encrypted titlekey right away. */
memcpy(tik->enc_titlekey, tik_common_block->titlekey_block, sizeof(tik->enc_titlekey));
success = true;
break;
case TikTitleKeyType_Personalized:
/* The titlekey block is encrypted using RSA-OAEP with a console-specific RSA key. */
/* We have to perform a RSA-OAEP unwrap operation to get the encrypted titlekey. */
success = keysDecryptRsaOaepWrappedTitleKey(tik_common_block->titlekey_block, tik->enc_titlekey);
break;
default:
LOG_MSG_ERROR("Invalid titlekey type value! (0x%02X).", tik_common_block->titlekey_type);
break;
}
return success;
}
static bool tikGetDecryptedTitleKey(void *dst, const void *src, u8 key_generation)
{
if (!dst || !src)
{
LOG_MSG_ERROR("Invalid parameters!");
return false;
}
const u8 *ticket_common_key = NULL;
ticket_common_key = keysGetTicketCommonKey(key_generation);
if (!ticket_common_key)
{
LOG_MSG_ERROR("Unable to retrieve ticket common key for key generation 0x%02X!", key_generation);
return false;
}
aes128EcbCrypt(dst, src, ticket_common_key, false);
return true;
}
static bool tikGetTitleKeyTypeFromRightsId(const FsRightsId *id, u8 *out)
{
if (!id || !out)
{
LOG_MSG_ERROR("Invalid parameters!");
return false;
}
u32 count = 0;
FsRightsId *rights_ids = NULL;
bool found = false;
for(u8 i = TikTitleKeyType_Common; i < TikTitleKeyType_Count; i++)
{
/* Get all rights IDs for the current titlekey type. */
if (!tikRetrieveRightsIdsByTitleKeyType(&rights_ids, &count, i == TikTitleKeyType_Personalized))
{
LOG_MSG_ERROR("Unable to retrieve %s rights IDs!", g_tikTitleKeyTypeStrings[i]);
continue;
}
/* Look for the provided rights ID. */
for(u32 j = 0; j < count; j++)
{
if (!memcmp(rights_ids[j].c, id->c, sizeof(id->c)))
{
*out = i;
found = true;
break;
}
}
if (rights_ids) free(rights_ids);
if (found) break;
}
return found;
}
static bool tikRetrieveRightsIdsByTitleKeyType(FsRightsId **out, u32 *out_count, bool personalized)
{
if (!out || !out_count)
{
LOG_MSG_ERROR("Invalid parameters!");
return false;
}
Result rc = 0;
u32 count = 0, ids_written = 0;
FsRightsId *rights_ids = NULL;
bool success = false;
#if LOG_LEVEL <= LOG_LEVEL_ERROR
u8 str_idx = (personalized ? TikTitleKeyType_Personalized : TikTitleKeyType_Common);
#endif
*out = NULL;
*out_count = 0;
/* Get ticket count for the provided titlekey type. */
rc = (personalized ? esCountPersonalizedTicket((s32*)&count) : esCountCommonTicket((s32*)&count));
if (R_FAILED(rc))
{
LOG_MSG_ERROR("esCount%c%sTicket failed! (0x%X).", toupper(g_tikTitleKeyTypeStrings[str_idx][0]), g_tikTitleKeyTypeStrings[str_idx] + 1, rc);
goto end;
}
if (!count)
{
LOG_MSG_WARNING("No %s tickets available!", g_tikTitleKeyTypeStrings[str_idx]);
success = true;
goto end;
}
/* Allocate memory for our rights ID array. */
rights_ids = calloc(count, sizeof(FsRightsId));
if (!rights_ids)
{
LOG_MSG_ERROR("Unable to allocate memory for %s rights IDs!", g_tikTitleKeyTypeStrings[str_idx]);
goto end;
}
/* Get rights IDs from all tickets that match the provided titlekey type. */
rc = (personalized ? esListPersonalizedTicket((s32*)&ids_written, rights_ids, (s32)count) : esListCommonTicket((s32*)&ids_written, rights_ids, (s32)count));
success = (R_SUCCEEDED(rc) && ids_written);
if (!success)
{
LOG_MSG_ERROR("esList%c%sTicket failed! (0x%X). Wrote %u entries, expected %u entries.", toupper(g_tikTitleKeyTypeStrings[str_idx][0]), g_tikTitleKeyTypeStrings[str_idx] + 1, rc, ids_written, count);
goto end;
}
/* Update output values. */
*out = rights_ids;
*out_count = ids_written;
end:
if (!success && rights_ids) free(rights_ids);
return success;
}
static bool tikGetTicketEntryOffsetFromTicketList(save_ctx_t *save_ctx, u8 *buf, u64 buf_size, const FsRightsId *id, u8 titlekey_type, u64 *out_offset)
{
if (!save_ctx || !buf || !buf_size || (buf_size % sizeof(TikListEntry)) != 0 || !id || titlekey_type >= TikTitleKeyType_Count || !out_offset)
{
LOG_MSG_ERROR("Invalid parameters!");
return false;
}
allocation_table_storage_ctx_t fat_storage = {0};
u64 ticket_list_bin_size = 0, br = 0, total_br = 0;
u8 last_rights_id[0x10] = {0};
memset(last_rights_id, 0xFF, sizeof(last_rights_id));
bool last_entry_found = false, success = false;
/* Get FAT storage info for the ticket_list.bin stored within the opened system savefile. */
if (!save_get_fat_storage_from_file_entry_by_path(save_ctx, TIK_LIST_STORAGE_PATH, &fat_storage, &ticket_list_bin_size))
{
LOG_MSG_ERROR("Failed to locate \"%s\" in ES %s ticket system save!", TIK_LIST_STORAGE_PATH, g_tikTitleKeyTypeStrings[titlekey_type]);
goto end;
}
/* Validate ticket_list.bin size. */
if (ticket_list_bin_size < sizeof(TikListEntry) || (ticket_list_bin_size % sizeof(TikListEntry)) != 0)
{
LOG_MSG_ERROR("Invalid size for \"%s\" in ES %s ticket system save! (0x%lX).", TIK_LIST_STORAGE_PATH, g_tikTitleKeyTypeStrings[titlekey_type], ticket_list_bin_size);
goto end;
}
/* Look for an entry matching our rights ID in ticket_list.bin. */
while(total_br < ticket_list_bin_size)
{
/* Update chunk size, if needed. */
if (buf_size > (ticket_list_bin_size - total_br)) buf_size = (ticket_list_bin_size - total_br);
/* Read current chunk. */
if ((br = save_allocation_table_storage_read(&fat_storage, buf, total_br, buf_size)) != buf_size)
{
LOG_MSG_ERROR("Failed to read 0x%lX bytes chunk at offset 0x%lX from \"%s\" in ES %s ticket system save!", buf_size, total_br, TIK_LIST_STORAGE_PATH, g_tikTitleKeyTypeStrings[titlekey_type]);
break;
}
/* Process individual ticket list entries. */
for(u64 i = 0; i < buf_size; i += sizeof(TikListEntry))
{
if ((buf_size - i) < sizeof(TikListEntry)) break;
u64 entry_offset = (total_br + i);
TikListEntry *entry = (TikListEntry*)(buf + i);
/* Check if we found the last entry. */
if (!memcmp(entry->rights_id.c, last_rights_id, sizeof(last_rights_id)))
{
last_entry_found = true;
break;
}
/* Check if this is the entry we're looking for. */
if (!memcmp(entry->rights_id.c, id->c, sizeof(id->c)))
{
/* Jackpot. */
*out_offset = (entry_offset << 5); /* (entry_offset / sizeof(TikListEntry)) * SIGNED_TIK_MAX_SIZE */
success = true;
break;
}
}
total_br += br;
if (last_entry_found || success) break;
}
end:
return success;
}
static bool tikRetrieveTicketEntryFromTicketBin(save_ctx_t *save_ctx, u8 *buf, u64 buf_size, const FsRightsId *id, u8 titlekey_type, u64 ticket_offset)
{
if (!save_ctx || !buf || buf_size < SIGNED_TIK_MAX_SIZE || !id || titlekey_type >= TikTitleKeyType_Count || (ticket_offset % SIGNED_TIK_MAX_SIZE) != 0)
{
LOG_MSG_ERROR("Invalid parameters!");
return false;
}
allocation_table_storage_ctx_t fat_storage = {0};
u64 ticket_bin_size = 0, br = 0;
TikCommonBlock *tik_common_block = NULL;
bool is_volatile = false, success = false;
/* Get FAT storage info for the ticket.bin stored within the opened system savefile. */
if (!save_get_fat_storage_from_file_entry_by_path(save_ctx, TIK_DB_STORAGE_PATH, &fat_storage, &ticket_bin_size))
{
LOG_MSG_ERROR("Failed to locate \"%s\" in ES %s ticket system save!", TIK_DB_STORAGE_PATH, g_tikTitleKeyTypeStrings[titlekey_type]);
goto end;
}
/* Validate ticket.bin size. */
if (ticket_bin_size < SIGNED_TIK_MIN_SIZE || (ticket_bin_size % SIGNED_TIK_MAX_SIZE) != 0 || ticket_bin_size < (ticket_offset + SIGNED_TIK_MAX_SIZE))
{
LOG_MSG_ERROR("Invalid size for \"%s\" in ES %s ticket system save! (0x%lX).", TIK_DB_STORAGE_PATH, g_tikTitleKeyTypeStrings[titlekey_type], ticket_bin_size);
goto end;
}
/* Read ticket data. */
if ((br = save_allocation_table_storage_read(&fat_storage, buf, ticket_offset, SIGNED_TIK_MAX_SIZE)) != SIGNED_TIK_MAX_SIZE)
{
LOG_MSG_ERROR("Failed to read 0x%X-byte long ticket at offset 0x%lX from \"%s\" in ES %s ticket system save!", SIGNED_TIK_MAX_SIZE, ticket_offset, TIK_DB_STORAGE_PATH, \
g_tikTitleKeyTypeStrings[titlekey_type]);
goto end;
}
/* Get ticket common block. */
tik_common_block = tikGetCommonBlockFromSignedTicketBlob(buf);
/* Check if we're dealing with a volatile (encrypted) ticket. */
is_volatile = (!tik_common_block || strncmp(tik_common_block->issuer, "Root-", 5) != 0);
if (is_volatile)
{
/* Attempt to decrypt the ticket. */
if (!tikDecryptVolatileTicket(buf, ticket_offset))
{
LOG_MSG_ERROR("Unable to decrypt volatile ticket at offset 0x%lX in \"%s\" from ES %s ticket system save!", ticket_offset, TIK_DB_STORAGE_PATH, g_tikTitleKeyTypeStrings[titlekey_type]);
goto end;
}
/* Get ticket common block. */
tik_common_block = tikGetCommonBlockFromSignedTicketBlob(buf);
}
/* Check if the rights ID from the ticket common block matches the one we're looking for. */
if (!(success = (memcmp(tik_common_block->rights_id.c, id->c, sizeof(id->c)) == 0))) LOG_MSG_ERROR("Retrieved ticket doesn't hold a matching Rights ID!");
end:
return success;
}
static bool tikDecryptVolatileTicket(u8 *buf, u64 ticket_offset)
{
if (!buf || (ticket_offset % SIGNED_TIK_MAX_SIZE) != 0)
{
LOG_MSG_ERROR("Invalid parameters!");
return false;
}
Aes128CtrContext ctr_ctx = {0};
u8 null_ctr[AES_128_KEY_SIZE] = {0}, ctr[AES_128_KEY_SIZE] = {0}, dec_tik[SIGNED_TIK_MAX_SIZE] = {0};
TikCommonBlock *tik_common_block = NULL;
bool success = false;
/* Don't proceed if HOS version isn't at least 9.0.0. */
if (!hosversionAtLeast(9, 0, 0))
{
LOG_MSG_ERROR("Unable to retrieve ES key entry for volatile tickets under HOS versions below 9.0.0!");
goto end;
}
/* Retrieve ES program memory. */
if (!memRetrieveFullProgramMemory(&g_esMemoryLocation))
{
LOG_MSG_ERROR("Failed to retrieve ES program memory!");
goto end;
}
/* Retrieve the CTR key/IV from ES program memory in order to decrypt this ticket. */
for(u64 i = 0; i < g_esMemoryLocation.data_size; i++)
{
if ((g_esMemoryLocation.data_size - i) < (sizeof(TikEsCtrKeyEntry9x) * 2)) break;
/* Check if the key indexes are valid. idx2 should always be an odd number equal to idx + 1. */
TikEsCtrKeyPattern9x *pattern = (TikEsCtrKeyPattern9x*)(g_esMemoryLocation.data + i);
if (pattern->idx2 != (pattern->idx1 + 1) || !(pattern->idx2 & 1)) continue;
/* Check if the key is not null and if the CTR is. */
TikEsCtrKeyEntry9x *key_entry = (TikEsCtrKeyEntry9x*)pattern;
if (!memcmp(key_entry->key, null_ctr, sizeof(null_ctr)) || memcmp(key_entry->ctr, null_ctr, sizeof(null_ctr)) != 0) continue;
/* Check if we can decrypt the current ticket with this data. */
memset(&ctr_ctx, 0, sizeof(Aes128CtrContext));
aes128CtrInitializePartialCtr(ctr, key_entry->ctr, ticket_offset);
aes128CtrContextCreate(&ctr_ctx, key_entry->key, ctr);
aes128CtrCrypt(&ctr_ctx, dec_tik, buf, SIGNED_TIK_MAX_SIZE);
/* Check if we successfully decrypted this ticket. */
if ((tik_common_block = tikGetCommonBlockFromSignedTicketBlob(dec_tik)) != NULL && !strncmp(tik_common_block->issuer, "Root-", 5))
{
memcpy(buf, dec_tik, SIGNED_TIK_MAX_SIZE);
success = true;
break;
}
}
if (!success) LOG_MSG_ERROR("Unable to find ES memory key entry!");
end:
memFreeMemoryLocation(&g_esMemoryLocation);
return success;
}
static bool tikGetTicketTypeAndSize(void *data, u64 data_size, u8 *out_type, u64 *out_size)
{
if (!data || data_size < SIGNED_TIK_MIN_SIZE || data_size > SIGNED_TIK_MAX_SIZE || !out_type || !out_size)
{
LOG_MSG_ERROR("Invalid parameters!");
return false;
}
u32 sig_type = 0;
u64 signed_ticket_size = 0;
u8 type = TikType_None;
bool success = false;
/* Get signature type and signed ticket size. */
sig_type = signatureGetTypeFromSignedBlob(data, false);
signed_ticket_size = tikGetSignedTicketBlobSize(data);
if (!signatureIsValidType(sig_type) || signed_ticket_size < SIGNED_TIK_MIN_SIZE || signed_ticket_size > data_size)
{
LOG_MSG_ERROR("Input buffer doesn't hold a valid signed ticket!");
goto end;
}
/* Determine ticket type. */
switch(sig_type)
{
case SignatureType_Rsa4096Sha1:
case SignatureType_Rsa4096Sha256:
type = TikType_SigRsa4096;
break;
case SignatureType_Rsa2048Sha1:
case SignatureType_Rsa2048Sha256:
type = TikType_SigRsa2048;
break;
case SignatureType_Ecc480Sha1:
case SignatureType_Ecc480Sha256:
type = TikType_SigEcc480;
break;
case SignatureType_Hmac160Sha1:
type = TikType_SigHmac160;
break;
default:
break;
}
/* Update output. */
success = (type > TikType_None && type < TikType_Count);
if (success)
{
*out_type = type;
*out_size = signed_ticket_size;
}
end:
return success;
}
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