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Code Issues Releases Activity

fs.mitm: Intercept OpenBisStorage calls.

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This commit is contained in:
Michael Scire 2018-11-14 18:39:48 -08:00
parent 66da896347
commit d95fc102db
6 changed files with 165 additions and 28 deletions
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62
stratosphere/fs_mitm/source/fs_istorage.hpp
View file

@ -108,3 +108,65 @@ class IROStorage : public IStorage {
virtual Result GetSize(u64 *out_size) = 0;
virtual Result OperateRange(u32 operation_type, u64 offset, u64 size, FsRangeInfo *out_range_info) = 0;
};
class ProxyStorage : public IStorage {
private:
FsStorage *base_storage;
public:
ProxyStorage(FsStorage *s) : base_storage(s) {
/* ... */
};
ProxyStorage(FsStorage s) {
this->base_storage = new FsStorage(s);
};
~ProxyStorage() {
fsStorageClose(base_storage);
delete base_storage;
};
public:
virtual Result Read(void *buffer, size_t size, u64 offset) override {
return fsStorageRead(this->base_storage, offset, buffer, size);
};
virtual Result Write(void *buffer, size_t size, u64 offset) override {
return fsStorageWrite(this->base_storage, offset, buffer, size);
};
virtual Result Flush() override {
return fsStorageFlush(this->base_storage);
};
virtual Result GetSize(u64 *out_size) override {
return fsStorageGetSize(this->base_storage, out_size);
};
virtual Result SetSize(u64 size) override {
return fsStorageSetSize(this->base_storage, size);
};
virtual Result OperateRange(u32 operation_type, u64 offset, u64 size, FsRangeInfo *out_range_info) override {
return fsStorageOperateRange(this->base_storage, operation_type, offset, size, out_range_info);
};
};
class ROProxyStorage : public IROStorage {
private:
FsStorage *base_storage;
public:
ROProxyStorage(FsStorage *s) : base_storage(s) {
/* ... */
};
ROProxyStorage(FsStorage s) {
this->base_storage = new FsStorage(s);
};
~ROProxyStorage() {
fsStorageClose(base_storage);
delete base_storage;
};
public:
virtual Result Read(void *buffer, size_t size, u64 offset) override {
return fsStorageRead(this->base_storage, offset, buffer, size);
};
virtual Result GetSize(u64 *out_size) override {
return fsStorageGetSize(this->base_storage, out_size);
};
virtual Result OperateRange(u32 operation_type, u64 offset, u64 size, FsRangeInfo *out_range_info) override {
return fsStorageOperateRange(this->base_storage, operation_type, offset, size, out_range_info);
};
};

38
stratosphere/fs_mitm/source/fs_shim.c
View file

@ -18,6 +18,44 @@
#include "fs_shim.h"
/* Missing fsp-srv commands. */
Result fsOpenBisStorageFwd(Service* s, FsStorage* out, u32 PartitionId) {
IpcCommand c;
ipcInitialize(&c);
struct {
u64 magic;
u64 cmd_id;
u32 PartitionId;
} *raw;
raw = serviceIpcPrepareHeader(s, &c, sizeof(*raw));
raw->magic = SFCI_MAGIC;
raw->cmd_id = 12;
raw->PartitionId = PartitionId;
Result rc = serviceIpcDispatch(s);
if (R_SUCCEEDED(rc)) {
IpcParsedCommand r;
struct {
u64 magic;
u64 result;
} *resp;
serviceIpcParse(s, &r, sizeof(*resp));
resp = r.Raw;
rc = resp->result;
if (R_SUCCEEDED(rc)) {
serviceCreateSubservice(&out->s, s, &r, 0);
}
}
return rc;
}
Result fsOpenDataStorageByCurrentProcessFwd(Service* s, FsStorage* out) {
IpcCommand c;
ipcInitialize(&c);

1
stratosphere/fs_mitm/source/fs_shim.h
View file

@ -17,6 +17,7 @@ typedef struct {
} FsRangeInfo;
/* Missing fsp-srv commands. */
Result fsOpenBisStorageFwd(Service* s, FsStorage* out, u32 PartitionId);
Result fsOpenDataStorageByCurrentProcessFwd(Service* s, FsStorage* out);
Result fsOpenDataStorageByDataIdFwd(Service* s, FsStorageId storage_id, u64 data_id, FsStorage* out);

28
stratosphere/fs_mitm/source/fsmitm_romstorage.hpp
View file

@ -54,30 +54,4 @@ class RomFileStorage : public IROStorage {
};
/* Represents a RomFS accessed via some IStorage. */
class RomInterfaceStorage : public IROStorage {
private:
FsStorage *base_storage;
public:
RomInterfaceStorage(FsStorage *s) : base_storage(s) {
/* ... */
};
RomInterfaceStorage(FsStorage s) {
this->base_storage = new FsStorage(s);
};
~RomInterfaceStorage() {
fsStorageClose(base_storage);
delete base_storage;
};
public:
Result Read(void *buffer, size_t size, u64 offset) override {
return fsStorageRead(this->base_storage, offset, buffer, size);
};
Result GetSize(u64 *out_size) override {
/* TODO: Merge into libnx? */
return fsStorageGetSize(this->base_storage, out_size);
};
Result OperateRange(u32 operation_type, u64 offset, u64 size, FsRangeInfo *out_range_info) override {
/* TODO: Merge into libnx? */
return fsStorageOperateRange(this->base_storage, operation_type, offset, size, out_range_info);
};
};
using RomInterfaceStorage = ROProxyStorage;

34
stratosphere/fs_mitm/source/fsmitm_service.cpp
View file

@ -79,6 +79,40 @@ void FsMitmService::PostProcess(IMitmServiceObject *obj, IpcResponseContext *ctx
}
}
/* Gate access to the BIS partitions. */
Result FsMitmService::OpenBisStorage(Out<std::shared_ptr<IStorageInterface>> out_storage, u32 bis_partition_id) {
std::shared_ptr<IStorageInterface> storage = nullptr;
u32 out_domain_id = 0;
Result rc = 0;
ON_SCOPE_EXIT {
if (R_SUCCEEDED(rc)) {
out_storage.SetValue(std::move(storage));
if (out_storage.IsDomain()) {
out_storage.ChangeObjectId(out_domain_id);
}
}
};
{
FsStorage bis_storage;
rc = fsOpenBisStorageFwd(this->forward_service.get(), &bis_storage, bis_partition_id);
if (R_SUCCEEDED(rc)) {
if (this->title_id >= 0x0100000000001000) {
storage = std::make_shared<IStorageInterface>(new ROProxyStorage(bis_storage));
} else {
/* Sysmodules should still be allowed to read and write. */
storage = std::make_shared<IStorageInterface>(new ProxyStorage(bis_storage));
}
if (out_storage.IsDomain()) {
out_domain_id = bis_storage.s.object_id;
}
}
}
return rc;
}
/* Add redirection for RomFS to the SD card. */
Result FsMitmService::OpenDataStorageByCurrentProcess(Out<std::shared_ptr<IStorageInterface>> out_storage) {
std::shared_ptr<IStorageInterface> storage = nullptr;

28
stratosphere/fs_mitm/source/fsmitm_service.hpp
View file

@ -22,10 +22,30 @@
enum FspSrvCmd : u32 {
FspSrvCmd_SetCurrentProcess = 1,
FspSrvCmd_OpenBisStorage = 12,
FspSrvCmd_OpenDataStorageByCurrentProcess = 200,
FspSrvCmd_OpenDataStorageByDataId = 202,
};
enum BisStorageId : u32 {
BisStorageId_Boot0 = 0,
BisStorageId_Boot1 = 10,
BisStorageId_RawNand = 20,
BisStorageId_BcPkg2_1 = 21,
BisStorageId_BcPkg2_2 = 22,
BisStorageId_BcPkg2_3 = 23,
BisStorageId_BcPkg2_4 = 24,
BisStorageId_BcPkg2_5 = 25,
BisStorageId_BcPkg2_6 = 26,
BisStorageId_Prodinfo = 27,
BisStorageId_ProdinfoF = 28,
BisStorageId_Safe = 29,
BisStorageId_User = 30,
BisStorageId_System = 31,
BisStorageId_SystemProperEncryption = 32,
BisStorageId_SystemProperPartition = 33,
};
class FsMitmService : public IMitmServiceObject {
private:
bool has_initialized = false;
@ -35,9 +55,15 @@ class FsMitmService : public IMitmServiceObject {
}
static bool ShouldMitm(u64 pid, u64 tid) {
/* Always intercept NS, so that we can protect the boot partition. */
if (tid == 0x010000000000001FULL) {
return true;
}
if (Utils::HasSdDisableMitMFlag(tid)) {
return false;
}
return (tid >= 0x0100000000010000ULL || Utils::HasSdMitMFlag(tid)) && Utils::HasOverrideButton(tid);
}
@ -45,10 +71,12 @@ class FsMitmService : public IMitmServiceObject {
protected:
/* Overridden commands. */
Result OpenBisStorage(Out<std::shared_ptr<IStorageInterface>> out, u32 bis_partition_id);
Result OpenDataStorageByCurrentProcess(Out<std::shared_ptr<IStorageInterface>> out);
Result OpenDataStorageByDataId(Out<std::shared_ptr<IStorageInterface>> out, u64 data_id, u8 storage_id);
public:
DEFINE_SERVICE_DISPATCH_TABLE {
MakeServiceCommandMeta<FspSrvCmd_OpenBisStorage, &FsMitmService::OpenBisStorage>(),
MakeServiceCommandMeta<FspSrvCmd_OpenDataStorageByCurrentProcess, &FsMitmService::OpenDataStorageByCurrentProcess>(),
MakeServiceCommandMeta<FspSrvCmd_OpenDataStorageByDataId, &FsMitmService::OpenDataStorageByDataId>(),
};