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spl: Implement FsService lotus commands (gamecards work now)

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This commit is contained in:
Michael Scire 2019-04-25 07:06:27 -07:00
parent 4b8ebfa7c3
commit d984621150
4 changed files with 120 additions and 11 deletions
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14
stratosphere/spl/source/spl_fs_service.cpp
View file

@ -20,15 +20,15 @@
#include "spl_fs_service.hpp"
Result FsService::ImportLotusKey(InPointer<u8> src, AccessKey access_key, KeySource key_source, u32 option) {
return ResultSuccess;
/* TODO */
return ResultKernelConnectionClosed;
return this->GetSecureMonitorWrapper()->ImportLotusKey(src.pointer, src.num_elements, access_key, key_source, option);
}
Result FsService::DecryptLotusMessage(Out<size_t> out_size, OutPointerWithClientSize<u8> out, InPointer<u8> base, InPointer<u8> mod, InPointer<u8> label_digest) {
return ResultSuccess;
/* TODO */
return ResultKernelConnectionClosed;
Result FsService::DecryptLotusMessage(Out<u32> out_size, OutPointerWithClientSize<u8> out, InPointer<u8> base, InPointer<u8> mod, InPointer<u8> label_digest) {
Result rc = this->GetSecureMonitorWrapper()->DecryptLotusMessage(out_size.GetPointer(), out.pointer, out.num_elements, base.pointer, base.num_elements, mod.pointer, mod.num_elements, label_digest.pointer, label_digest.num_elements);
if (R_FAILED(rc)) {
fatalSimple(rc);
}
return rc;
}
Result FsService::GenerateSpecificAesKey(Out<AesKey> out_key, KeySource key_source, u32 generation, u32 which) {

2
stratosphere/spl/source/spl_fs_service.hpp
View file

@ -33,7 +33,7 @@ class FsService : public CryptoService {
protected:
/* Actual commands. */
virtual Result ImportLotusKey(InPointer<u8> src, AccessKey access_key, KeySource key_source, u32 option);
virtual Result DecryptLotusMessage(Out<size_t> out_size, OutPointerWithClientSize<u8> out, InPointer<u8> base, InPointer<u8> mod, InPointer<u8> label_digest);
virtual Result DecryptLotusMessage(Out<u32> out_size, OutPointerWithClientSize<u8> out, InPointer<u8> base, InPointer<u8> mod, InPointer<u8> label_digest);
virtual Result GenerateSpecificAesKey(Out<AesKey> out_key, KeySource key_source, u32 generation, u32 which);
virtual Result LoadTitleKey(u32 keyslot, AccessKey access_key);
virtual Result GetPackage2Hash(OutPointerWithClientSize<u8> dst);

110
stratosphere/spl/source/spl_secmon_wrapper.cpp
View file

@ -130,6 +130,82 @@ void SecureMonitorWrapper::Initialize() {
InitializeDeviceAddressSpace();
}
void SecureMonitorWrapper::CalcMgf1AndXor(void *dst, size_t dst_size, const void *src, size_t src_size) {
uint8_t *dst_u8 = reinterpret_cast<u8 *>(dst);
u32 ctr = 0;
while (dst_size > 0) {
size_t cur_size = SHA256_HASH_SIZE;
if (cur_size > dst_size) {
cur_size = dst_size;
}
dst_size -= cur_size;
u32 ctr_be = __builtin_bswap32(ctr++);
u8 hash[SHA256_HASH_SIZE];
{
Sha256Context ctx;
sha256ContextCreate(&ctx);
sha256ContextUpdate(&ctx, src, src_size);
sha256ContextUpdate(&ctx, &ctr_be, sizeof(ctr_be));
sha256ContextGetHash(&ctx, hash);
}
for (size_t i = 0; i < cur_size; i++) {
*(dst_u8++) ^= hash[i];
}
}
}
size_t SecureMonitorWrapper::DecodeRsaOaep(void *dst, size_t dst_size, const void *label_digest, size_t label_digest_size, const void *src, size_t src_size) {
/* Very basic validation. */
if (dst_size == 0 || src_size != 0x100 || label_digest_size != SHA256_HASH_SIZE) {
return 0;
}
u8 block[0x100];
std::memcpy(block, src, sizeof(block));
/* First, validate byte 0 == 0, and unmask DB. */
int invalid = block[0];
u8 *salt = block + 1;
u8 *db = salt + SHA256_HASH_SIZE;
CalcMgf1AndXor(salt, SHA256_HASH_SIZE, db, src_size - (1 + SHA256_HASH_SIZE));
CalcMgf1AndXor(db, src_size - (1 + SHA256_HASH_SIZE), salt, SHA256_HASH_SIZE);
/* Validate label digest. */
for (size_t i = 0; i < SHA256_HASH_SIZE; i++) {
invalid |= db[i] ^ reinterpret_cast<const u8 *>(label_digest)[i];
}
/* Locate message after 00...0001 padding. */
const u8 *padded_msg = db + SHA256_HASH_SIZE;
size_t padded_msg_size = src_size - (1 + 2 * SHA256_HASH_SIZE);
size_t msg_ind = 0;
int not_found = 1;
int wrong_padding = 0;
size_t i = 0;
while (i < padded_msg_size) {
int zero = (padded_msg[i] == 0);
int one = (padded_msg[i] == 1);
msg_ind += static_cast<size_t>(not_found & one) * (++i);
not_found &= ~one;
wrong_padding |= (not_found & ~zero);
}
if (invalid | not_found | wrong_padding) {
return 0;
}
/* Copy message out. */
size_t msg_size = padded_msg_size - msg_ind;
if (msg_size > dst_size) {
return 0;
}
std::memcpy(dst, padded_msg + msg_ind, msg_size);
return msg_size;
}
void SecureMonitorWrapper::WaitSeOperationComplete() {
eventWait(&g_se_event, U64_MAX);
}
@ -726,6 +802,34 @@ Result SecureMonitorWrapper::LoadElicenseKey(u32 keyslot, const void *owner, con
return LoadTitleKey(keyslot, owner, access_key);
}
Result SecureMonitorWrapper::ImportLotusKey(const void *src, size_t src_size, const AccessKey &access_key, const KeySource &key_source, u32 option) {
if (GetRuntimeFirmwareVersion() >= FirmwareVersion_500) {
option = SmcDecryptOrImportMode_ImportLotusKey;
}
return ImportSecureExpModKey(src, src_size, access_key, key_source, option);
}
Result SecureMonitorWrapper::DecryptLotusMessage(u32 *out_size, void *dst, size_t dst_size, const void *base, size_t base_size, const void *mod, size_t mod_size, const void *label_digest, size_t label_digest_size) {
/* Validate sizes. */
if (dst_size > MaxWorkBufferSize || label_digest_size != LabelDigestSizeMax) {
return ResultSplInvalidSize;
}
/* Nintendo doesn't check this result code, but we will. */
Result rc = SecureExpMod(g_work_buffer, 0x100, base, base_size, mod, mod_size, SmcSecureExpModMode_Lotus);
if (R_FAILED(rc)) {
return rc;
}
size_t data_size = DecodeRsaOaep(dst, dst_size, label_digest, label_digest_size, g_work_buffer, 0x100);
if (data_size == 0) {
return ResultSplDecryptionFailed;
}
*out_size = static_cast<u32>(data_size);
return ResultSuccess;
}
Result SecureMonitorWrapper::GenerateSpecificAesKey(AesKey *out_key, const KeySource &key_source, u32 generation, u32 which) {
return ConvertToSplResult(SmcWrapper::GenerateSpecificAesKey(out_key, key_source, generation, which));
}
@ -740,16 +844,16 @@ Result SecureMonitorWrapper::LoadTitleKey(u32 keyslot, const void *owner, const
Result SecureMonitorWrapper::GetPackage2Hash(void *dst, const size_t size) {
u64 hash[4];
if (size < sizeof(hash)) {
return ResultSplInvalidSize;
}
SmcResult smc_res;
if ((smc_res = SmcWrapper::GetConfig(hash, 4, SplConfigItem_Package2Hash)) != SmcResult_Success) {
return ConvertToSplResult(smc_res);
}
std::memcpy(dst, hash, sizeof(hash));
return ResultSuccess;
}

5
stratosphere/spl/source/spl_secmon_wrapper.hpp
View file

@ -44,6 +44,9 @@ class SecureMonitorWrapper {
static void InitializeCtrDrbg();
static void InitializeSeEvents();
static void InitializeDeviceAddressSpace();
static void CalcMgf1AndXor(void *dst, size_t dst_size, const void *src, size_t src_size);
static size_t DecodeRsaOaep(void *dst, size_t dst_size, const void *label_digest, size_t label_digest_size, const void *src, size_t src_size);
public:
static void Initialize();
private:
@ -93,6 +96,8 @@ class SecureMonitorWrapper {
Result LoadElicenseKey(u32 keyslot, const void *owner, const AccessKey &access_key);
/* FS */
Result ImportLotusKey(const void *src, size_t src_size, const AccessKey &access_key, const KeySource &key_source, u32 option);
Result DecryptLotusMessage(u32 *out_size, void *dst, size_t dst_size, const void *base, size_t base_size, const void *mod, size_t mod_size, const void *label_digest, size_t label_digest_size);
Result GenerateSpecificAesKey(AesKey *out_key, const KeySource &key_source, u32 generation, u32 which);
Result LoadTitleKey(u32 keyslot, const void *owner, const AccessKey &access_key);
Result GetPackage2Hash(void *dst, const size_t size);