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Atmosphere/stratosphere/sm/source/impl/sm_service_manager.cpp

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/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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 <http://www.gnu.org/licenses/>.
*/
#include <stratosphere.hpp>
#include "sm_service_manager.hpp"
#include "../sm_wait_list.hpp"
namespace ams::sm::impl {
namespace {
/* Constexpr definitions. */
static constexpr size_t ProcessCountMax = 0x50;
static constexpr size_t ServiceCountMax = 0x100 + 0x10; /* Extra 0x10 services over Nintendo for homebrew. */
static constexpr size_t FutureMitmCountMax = 0x20;
static constexpr size_t AccessControlSizeMax = 0x200;
constexpr sm::ServiceName InitiallyDeferredServices[] = {
ServiceName::Encode("fsp-srv")
};
/* Types. */
struct ProcessInfo {
os::ProcessId process_id;
ncm::ProgramId program_id;
cfg::OverrideStatus override_status;
size_t access_control_size;
u8 access_control[AccessControlSizeMax];
};
constexpr ProcessInfo InvalidProcessInfo = {
.process_id = os::InvalidProcessId,
.program_id = ncm::InvalidProgramId,
.override_status = {},
.access_control_size = 0,
.access_control = {},
};
struct ServiceInfo {
ServiceName name;
os::ProcessId owner_process_id;
os::ProcessId mitm_process_id;
os::ProcessId mitm_waiting_ack_process_id;
svc::Handle mitm_port_h;
svc::Handle mitm_query_h;
svc::Handle port_h;
svc::Handle mitm_fwd_sess_h;
s32 max_sessions;
bool is_light;
bool mitm_waiting_ack;
};
constexpr ServiceInfo InvalidServiceInfo = {
.name = sm::InvalidServiceName,
.owner_process_id = os::InvalidProcessId,
.mitm_process_id = os::InvalidProcessId,
.mitm_waiting_ack_process_id = os::InvalidProcessId,
.mitm_port_h = svc::InvalidHandle,
.mitm_query_h = svc::InvalidHandle,
.port_h = svc::InvalidHandle,
.mitm_fwd_sess_h = svc::InvalidHandle,
.max_sessions = 0,
.is_light = false,
.mitm_waiting_ack = false,
};
class AccessControlEntry {
private:
const u8 *m_entry;
size_t m_capacity;
public:
AccessControlEntry(const void *e, size_t c) : m_entry(static_cast<const u8 *>(e)), m_capacity(c) {
/* ... */
}
AccessControlEntry GetNextEntry() const {
return AccessControlEntry(m_entry + this->GetSize(), m_capacity - this->GetSize());
}
size_t GetSize() const {
return this->GetServiceNameSize() + 1;
}
size_t GetServiceNameSize() const {
return (m_entry[0] & 7) + 1;
}
ServiceName GetServiceName() const {
return ServiceName::Encode(reinterpret_cast<const char *>(m_entry + 1), this->GetServiceNameSize());
}
bool IsHost() const {
return (m_entry[0] & 0x80) != 0;
}
bool IsWildcard() const {
return m_entry[this->GetServiceNameSize()] == '*';
}
bool IsValid() const {
/* Validate that we can access data. */
if (m_entry == nullptr || m_capacity == 0) {
return false;
}
/* Validate that the size is correct. */
return this->GetSize() <= m_capacity;
}
};
class InitialProcessIdLimits {
private:
os::ProcessId min;
os::ProcessId max;
public:
InitialProcessIdLimits() {
/* Retrieve process limits. */
cfg::GetInitialProcessRange(&this->min, &this->max);
/* Ensure range is sane. */
AMS_ABORT_UNLESS(this->min <= this->max);
}
bool IsInitialProcess(os::ProcessId process_id) const {
AMS_ABORT_UNLESS(process_id != os::InvalidProcessId);
return this->min <= process_id && process_id <= this->max;
}
};
/* Static members. */
/* NOTE: In 12.0.0, Nintendo added multithreaded processing to sm; however, official sm does not do */
/* any kind of mutual exclusivity when accessing (and modifying) global state. Previously, this was */
/* not a problem, because sm was strictly single-threaded, and so two threads could not race eachother. */
/* We will add a mutex (and perform locking) in order to prevent simultaneous access to global state. */
constinit os::Mutex g_mutex{true};
constinit std::array<ProcessInfo, ProcessCountMax> g_process_list = [] {
std::array<ProcessInfo, ProcessCountMax> list = {};
/* Initialize each info. */
for (auto &process_info : list) {
process_info = InvalidProcessInfo;
}
return list;
}();
constinit std::array<ServiceInfo, ServiceCountMax> g_service_list = [] {
std::array<ServiceInfo, ServiceCountMax> list = {};
/* Initialize each info. */
for (auto &service_info : list) {
service_info = InvalidServiceInfo;
}
return list;
}();
constinit std::array<ServiceName, FutureMitmCountMax> g_future_mitm_list = [] {
std::array<ServiceName, FutureMitmCountMax> list = {};
/* Initialize each info. */
for (auto &name : list) {
name = InvalidServiceName;
}
return list;
}();
constinit bool g_ended_initial_defers = false;
InitialProcessIdLimits g_initial_process_id_limits;
/* Helper functionality. */
bool IsInitialProcess(os::ProcessId process_id) {
return g_initial_process_id_limits.IsInitialProcess(process_id);
}
constexpr inline bool IsValidProcessId(os::ProcessId process_id) {
return process_id != os::InvalidProcessId;
}
Result ValidateAccessControl(AccessControlEntry access_control, ServiceName service, bool is_host, bool is_wildcard) {
/* Iterate over all entries in the access control, checking to see if we have a match. */
while (access_control.IsValid()) {
if (access_control.IsHost() == is_host) {
bool is_valid = true;
if (access_control.IsWildcard() == is_wildcard) {
/* Check for exact match. */
is_valid &= access_control.GetServiceName() == service;
} else if (access_control.IsWildcard()) {
/* Also allow fuzzy match for wildcard. */
ServiceName ac_service = access_control.GetServiceName();
is_valid &= std::memcmp(std::addressof(ac_service), std::addressof(service), access_control.GetServiceNameSize() - 1) == 0;
}
R_SUCCEED_IF(is_valid);
}
access_control = access_control.GetNextEntry();
}
return sm::ResultNotAllowed();
}
Result ValidateAccessControl(AccessControlEntry restriction, AccessControlEntry access) {
/* Ensure that every entry in the access control is allowed by the restriction control. */
while (access.IsValid()) {
R_TRY(ValidateAccessControl(restriction, access.GetServiceName(), access.IsHost(), access.IsWildcard()));
access = access.GetNextEntry();
}
return ResultSuccess();
}
Result ValidateServiceName(ServiceName service) {
/* Service names must be non-empty. */
R_UNLESS(service.name[0] != 0, sm::ResultInvalidServiceName());
/* Get name length. */
size_t name_len;
for (name_len = 1; name_len < sizeof(service); name_len++) {
if (service.name[name_len] == 0) {
break;
}
}
/* Names must be all-zero after they end. */
while (name_len < sizeof(service)) {
R_UNLESS(service.name[name_len++] == 0, sm::ResultInvalidServiceName());
}
return ResultSuccess();
}
bool ShouldDeferForInit(ServiceName service) {
/* Once end has been called, we're done. */
if (g_ended_initial_defers) {
return false;
}
/* This is a mechanism by which certain services will always be deferred until sm:m receives a special command. */
/* This can be extended with more services as needed at a later date. */
for (const auto &service_name : InitiallyDeferredServices) {
if (service == service_name) {
return true;
}
}
return false;
}
ProcessInfo *GetProcessInfo(os::ProcessId process_id) {
/* Find a process info with a matching id. */
for (auto &process_info : g_process_list) {
if (process_info.process_id == process_id) {
return std::addressof(process_info);
}
}
return nullptr;
}
ProcessInfo *GetFreeProcessInfo() {
return GetProcessInfo(os::InvalidProcessId);
}
bool HasProcessInfo(os::ProcessId process_id) {
return GetProcessInfo(process_id) != nullptr;
}
ServiceInfo *GetServiceInfo(ServiceName service_name) {
/* Find a service with a matching name. */
for (auto &service_info : g_service_list) {
if (service_info.name == service_name) {
return std::addressof(service_info);
}
}
return nullptr;
}
ServiceInfo *GetFreeServiceInfo() {
return GetServiceInfo(InvalidServiceName);
}
bool HasServiceInfo(ServiceName service) {
return GetServiceInfo(service) != nullptr;
}
bool HasMitm(ServiceName service) {
const ServiceInfo *service_info = GetServiceInfo(service);
return service_info != nullptr && IsValidProcessId(service_info->mitm_process_id);
}
Result AddFutureMitmDeclaration(ServiceName service) {
for (auto &future_mitm : g_future_mitm_list) {
if (future_mitm == InvalidServiceName) {
future_mitm = service;
return ResultSuccess();
}
}
return sm::ResultOutOfServices();
}
bool HasFutureMitmDeclaration(ServiceName service) {
for (const auto &future_mitm : g_future_mitm_list){
if (future_mitm == service) {
return true;
}
}
return false;
}
void ClearFutureMitmDeclaration(ServiceName service) {
for (auto &future_mitm : g_future_mitm_list) {
if (future_mitm == service) {
future_mitm = InvalidServiceName;
}
}
/* This might undefer some requests. */
TriggerResume(service);
}
void GetMitmProcessInfo(MitmProcessInfo *out_info, os::ProcessId process_id) {
/* Anything that can request a mitm session must have a process info. */
const auto process_info = GetProcessInfo(process_id);
AMS_ABORT_UNLESS(process_info != nullptr);
/* Write to output. */
out_info->process_id = process_id;
out_info->program_id = process_info->program_id;
out_info->override_status = process_info->override_status;
}
bool IsMitmDisallowed(ncm::ProgramId program_id) {
/* Mitm used on certain programs can prevent the boot process from completing. */
/* TODO: Is there a way to do this that's less hardcoded? Needs design thought. */
return program_id == ncm::SystemProgramId::Loader ||
program_id == ncm::SystemProgramId::Pm ||
program_id == ncm::SystemProgramId::Spl ||
program_id == ncm::SystemProgramId::Boot ||
program_id == ncm::SystemProgramId::Ncm ||
program_id == ncm::AtmosphereProgramId::Mitm ||
program_id == ncm::SystemProgramId::Creport;
}
Result GetMitmServiceHandleImpl(svc::Handle *out, ServiceInfo *service_info, const MitmProcessInfo &client_info) {
/* Send command to query if we should mitm. */
bool should_mitm;
{
/* TODO: Convert mitm internal messaging to use tipc? */
::Service srv { .session = service_info->mitm_query_h };
R_TRY(::serviceDispatchInOut(std::addressof(srv), 65000, client_info, should_mitm));
}
/* If we shouldn't mitm, give normal session. */
R_UNLESS(should_mitm, svc::ConnectToPort(out, service_info->port_h));
/* Create both handles. */
{
/* Get the forward handle. */
svc::Handle fwd_hnd;
R_TRY(svc::ConnectToPort(std::addressof(fwd_hnd), service_info->port_h));
/* Ensure that the forward handle is closed, if we fail to get the mitm handle. */
auto fwd_guard = SCOPE_GUARD { R_ABORT_UNLESS(svc::CloseHandle(fwd_hnd)); };
/* Get the mitm handle. */
svc::Handle hnd;
R_TRY(svc::ConnectToPort(std::addressof(hnd), service_info->mitm_port_h));
/* We got both handles, so we no longer need to clean up the forward handle. */
fwd_guard.Cancel();
/* Save the handles to their respective storages. */
service_info->mitm_fwd_sess_h = fwd_hnd;
*out = hnd;
}
service_info->mitm_waiting_ack_process_id = client_info.process_id;
service_info->mitm_waiting_ack = true;
return ResultSuccess();
}
Result GetServiceHandleImpl(svc::Handle *out, ServiceInfo *service_info, os::ProcessId process_id) {
/* Clear handle output. */
*out = svc::InvalidHandle;
/* Check if we should return a mitm handle. */
if (IsValidProcessId(service_info->mitm_process_id) && service_info->mitm_process_id != process_id) {
/* Get mitm process info, ensure that we're allowed to mitm the given program. */
MitmProcessInfo client_info;
GetMitmProcessInfo(std::addressof(client_info), process_id);
if (!IsMitmDisallowed(client_info.program_id)) {
/* We're mitm'd. Assert, because mitm service host dead is an error state. */
R_ABORT_UNLESS(GetMitmServiceHandleImpl(out, service_info, client_info));
return ResultSuccess();
}
}
/* We're not returning a mitm handle, so just return a normal port handle. */
return svc::ConnectToPort(out, service_info->port_h);
}
Result RegisterServiceImpl(svc::Handle *out, os::ProcessId process_id, ServiceName service, size_t max_sessions, bool is_light) {
/* Validate service name. */
R_TRY(ValidateServiceName(service));
/* Don't try to register something already registered. */
R_UNLESS(!HasServiceInfo(service), sm::ResultAlreadyRegistered());
/* Get free service. */
ServiceInfo *free_service = GetFreeServiceInfo();
R_UNLESS(free_service != nullptr, sm::ResultOutOfServices());
/* Create the new service. */
*out = svc::InvalidHandle;
svc::Handle server_hnd = svc::InvalidHandle;
R_TRY(svc::CreatePort(out, std::addressof(server_hnd), max_sessions, is_light, reinterpret_cast<uintptr_t>(free_service->name.name)));
/* Save info. */
free_service->name = service;
free_service->owner_process_id = process_id;
free_service->max_sessions = max_sessions;
free_service->is_light = is_light;
free_service->port_h = server_hnd;
/* This might undefer some requests. */
TriggerResume(service);
return ResultSuccess();
}
void UnregisterServiceImpl(ServiceInfo *service_info) {
/* Close all valid handles. */
if (service_info->port_h != svc::InvalidHandle) { R_ABORT_UNLESS(svc::CloseHandle(service_info->port_h)); }
if (service_info->mitm_port_h != svc::InvalidHandle) { R_ABORT_UNLESS(svc::CloseHandle(service_info->mitm_port_h)); }
if (service_info->mitm_query_h != svc::InvalidHandle) { R_ABORT_UNLESS(svc::CloseHandle(service_info->mitm_query_h)); }
if (service_info->mitm_fwd_sess_h != svc::InvalidHandle) { R_ABORT_UNLESS(svc::CloseHandle(service_info->mitm_fwd_sess_h)); }
/* Reset the info's state. */
*service_info = InvalidServiceInfo;
}
}
/* Client disconnection callback. */
void OnClientDisconnected(os::ProcessId process_id) {
/* Acquire exclusive access to global state. */
std::scoped_lock lk(g_mutex);
/* Ensure that the process id is valid. */
if (process_id == os::InvalidProcessId) {
return;
}
/* Unregister all services a client hosts, on attached-client-close. */
for (auto &service_info : g_service_list) {
if (service_info.name != InvalidServiceName && service_info.owner_process_id == process_id) {
UnregisterServiceImpl(std::addressof(service_info));
}
}
}
/* Process management. */
Result RegisterProcess(os::ProcessId process_id, ncm::ProgramId program_id, cfg::OverrideStatus override_status, const void *acid_sac, size_t acid_sac_size, const void *aci_sac, size_t aci_sac_size) {
/* Acquire exclusive access to global state. */
std::scoped_lock lk(g_mutex);
/* Check that access control will fit in the ServiceInfo. */
R_UNLESS(aci_sac_size <= AccessControlSizeMax, sm::ResultTooLargeAccessControl());
/* Get free process. */
ProcessInfo *proc = GetFreeProcessInfo();
R_UNLESS(proc != nullptr, sm::ResultOutOfProcesses());
/* Validate restrictions. */
R_UNLESS(aci_sac_size != 0, sm::ResultNotAllowed());
R_TRY(ValidateAccessControl(AccessControlEntry(acid_sac, acid_sac_size), AccessControlEntry(aci_sac, aci_sac_size)));
/* Save info. */
proc->process_id = process_id;
proc->program_id = program_id;
proc->override_status = override_status;
proc->access_control_size = aci_sac_size;
std::memcpy(proc->access_control, aci_sac, proc->access_control_size);
return ResultSuccess();
}
Result UnregisterProcess(os::ProcessId process_id) {
/* Acquire exclusive access to global state. */
std::scoped_lock lk(g_mutex);
/* Find the process. */
ProcessInfo *proc = GetProcessInfo(process_id);
R_UNLESS(proc != nullptr, sm::ResultInvalidClient());
/* Free the process. */
*proc = InvalidProcessInfo;
return ResultSuccess();
}
/* Service management. */
Result HasService(bool *out, ServiceName service) {
/* Acquire exclusive access to global state. */
std::scoped_lock lk(g_mutex);
/* Validate service name. */
R_TRY(ValidateServiceName(service));
*out = HasServiceInfo(service);
return ResultSuccess();
}
Result WaitService(ServiceName service) {
/* Acquire exclusive access to global state. */
std::scoped_lock lk(g_mutex);
/* Check that we have the service. */
bool has_service = false;
R_TRY(impl::HasService(&has_service, service));
/* If we do, we can succeed immediately. */
R_SUCCEED_IF(has_service);
/* Otherwise, we want to wait until the service is registered. */
return StartRegisterRetry(service);
}
Result GetServiceHandle(svc::Handle *out, os::ProcessId process_id, ServiceName service) {
/* Acquire exclusive access to global state. */
std::scoped_lock lk(g_mutex);
/* Validate service name. */
R_TRY(ValidateServiceName(service));
/* In 8.0.0, Nintendo removed the service apm:p -- however, all homebrew attempts to get */
/* a handle to this when calling appletInitialize(). Because hbl has access to all services, */
/* This would return true, and homebrew would *wait forever* trying to get a handle to a service */
/* that will never register. Thus, in the interest of not breaking every single piece of homebrew */
/* we will provide a little first class help. */
constexpr ServiceName ApmP = ServiceName::Encode("apm:p");
R_UNLESS((hos::GetVersion() < hos::Version_8_0_0) || (service != ApmP), sm::ResultNotAllowed());
/* Check that the process is registered and allowed to get the service. */
if (!IsInitialProcess(process_id)) {
ProcessInfo *proc = GetProcessInfo(process_id);
R_UNLESS(proc != nullptr, sm::ResultInvalidClient());
R_TRY(ValidateAccessControl(AccessControlEntry(proc->access_control, proc->access_control_size), service, false, false));
}
/* Get service info. Check to see if we need to defer this until later. */
ServiceInfo *service_info = GetServiceInfo(service);
if (service_info == nullptr || ShouldDeferForInit(service) || HasFutureMitmDeclaration(service) || service_info->mitm_waiting_ack) {
return StartRegisterRetry(service);
}
/* Get a handle from the service info. */
R_TRY_CATCH(GetServiceHandleImpl(out, service_info, process_id)) {
R_CONVERT(svc::ResultOutOfSessions, sm::ResultOutOfSessions())
} R_END_TRY_CATCH;
return ResultSuccess();
}
Result RegisterService(svc::Handle *out, os::ProcessId process_id, ServiceName service, size_t max_sessions, bool is_light) {
/* Acquire exclusive access to global state. */
std::scoped_lock lk(g_mutex);
/* Validate service name. */
R_TRY(ValidateServiceName(service));
/* Check that the process is registered and allowed to register the service. */
if (!IsInitialProcess(process_id)) {
ProcessInfo *proc = GetProcessInfo(process_id);
R_UNLESS(proc != nullptr, sm::ResultInvalidClient());
R_TRY(ValidateAccessControl(AccessControlEntry(proc->access_control, proc->access_control_size), service, true, false));
}
/* Check that the service isn't already registered. */
R_UNLESS(!HasServiceInfo(service), sm::ResultAlreadyRegistered());
return RegisterServiceImpl(out, process_id, service, max_sessions, is_light);
}
Result RegisterServiceForSelf(svc::Handle *out, ServiceName service, size_t max_sessions) {
/* Acquire exclusive access to global state. */
std::scoped_lock lk(g_mutex);
return RegisterServiceImpl(out, os::GetCurrentProcessId(), service, max_sessions, false);
}
Result UnregisterService(os::ProcessId process_id, ServiceName service) {
/* Acquire exclusive access to global state. */
std::scoped_lock lk(g_mutex);
/* Validate service name. */
R_TRY(ValidateServiceName(service));
/* Check that the process is registered. */
if (!IsInitialProcess(process_id)) {
R_UNLESS(HasProcessInfo(process_id), sm::ResultInvalidClient());
}
/* Ensure that the service is actually registered. */
ServiceInfo *service_info = GetServiceInfo(service);
R_UNLESS(service_info != nullptr, sm::ResultNotRegistered());
/* Check if we have permission to do this. */
R_UNLESS(service_info->owner_process_id == process_id, sm::ResultNotAllowed());
/* Unregister the service. */
UnregisterServiceImpl(service_info);
return ResultSuccess();
}
/* Mitm extensions. */
Result HasMitm(bool *out, ServiceName service) {
/* Acquire exclusive access to global state. */
std::scoped_lock lk(g_mutex);
/* Validate service name. */
R_TRY(ValidateServiceName(service));
/* Get whether we have a mitm. */
*out = HasMitm(service);
return ResultSuccess();
}
Result WaitMitm(ServiceName service) {
/* Acquire exclusive access to global state. */
std::scoped_lock lk(g_mutex);
/* Check that we have the mitm. */
bool has_mitm = false;
R_TRY(impl::HasMitm(std::addressof(has_mitm), service));
/* If we do, we can succeed immediately. */
R_SUCCEED_IF(has_mitm);
/* Otherwise, we want to wait until the service is registered. */
return StartRegisterRetry(service);
}
Result InstallMitm(svc::Handle *out, svc::Handle *out_query, os::ProcessId process_id, ServiceName service) {
/* Acquire exclusive access to global state. */
std::scoped_lock lk(g_mutex);
/* Validate service name. */
R_TRY(ValidateServiceName(service));
/* Check that the process is registered and allowed to register the service. */
if (!IsInitialProcess(process_id)) {
ProcessInfo *proc = GetProcessInfo(process_id);
R_UNLESS(proc != nullptr, sm::ResultInvalidClient());
R_TRY(ValidateAccessControl(AccessControlEntry(proc->access_control, proc->access_control_size), service, true, false));
}
/* Validate that the service exists. */
ServiceInfo *service_info = GetServiceInfo(service);
/* If it doesn't exist, defer until it does. */
R_UNLESS(service_info != nullptr, StartRegisterRetry(service));
/* Validate that the service isn't already being mitm'd. */
R_UNLESS(!IsValidProcessId(service_info->mitm_process_id), sm::ResultAlreadyRegistered());
/* Always clear output. */
*out = svc::InvalidHandle;
*out_query = svc::InvalidHandle;
/* If we don't have a future mitm declaration, add one. */
/* Client will clear this when ready to process. */
const bool has_existing_future_declaration = HasFutureMitmDeclaration(service);
if (!has_existing_future_declaration) {
R_TRY(AddFutureMitmDeclaration(service));
}
auto future_guard = SCOPE_GUARD { if (!has_existing_future_declaration) { ClearFutureMitmDeclaration(service); } };
/* Create mitm handles. */
{
/* Get the port handles. */
svc::Handle hnd, port_hnd;
R_TRY(svc::CreatePort(std::addressof(hnd), std::addressof(port_hnd), service_info->max_sessions, service_info->is_light, reinterpret_cast<uintptr_t>(service_info->name.name)));
/* Ensure that we clean up the port handles, if something goes wrong creating the query sessions. */
auto port_guard = SCOPE_GUARD { R_ABORT_UNLESS(svc::CloseHandle(hnd)); R_ABORT_UNLESS(svc::CloseHandle(port_hnd)); };
/* Create the session for our query service. */
svc::Handle qry_hnd, mitm_qry_hnd;
R_TRY(svc::CreateSession(std::addressof(qry_hnd), std::addressof(mitm_qry_hnd), false, 0));
/* We created the query service session, so we no longer need to clean up the port handles. */
port_guard.Cancel();
/* Copy to output. */
service_info->mitm_process_id = process_id;
service_info->mitm_port_h = port_hnd;
service_info->mitm_query_h = mitm_qry_hnd;
*out = hnd;
*out_query = qry_hnd;
/* This might undefer some requests. */
TriggerResume(service);
}
future_guard.Cancel();
return ResultSuccess();
}
Result UninstallMitm(os::ProcessId process_id, ServiceName service) {
/* Acquire exclusive access to global state. */
std::scoped_lock lk(g_mutex);
/* Validate service name. */
R_TRY(ValidateServiceName(service));
/* Check that the process is registered. */
if (!IsInitialProcess(process_id)) {
ProcessInfo *proc = GetProcessInfo(process_id);
R_UNLESS(proc != nullptr, sm::ResultInvalidClient());
}
/* Validate that the service exists. */
ServiceInfo *service_info = GetServiceInfo(service);
R_UNLESS(service_info != nullptr, sm::ResultNotRegistered());
/* Validate that the client process_id is the mitm process. */
R_UNLESS(service_info->mitm_process_id == process_id, sm::ResultNotAllowed());
/* Uninstall the mitm. */
{
/* Close mitm handles. */
R_ABORT_UNLESS(svc::CloseHandle(service_info->mitm_port_h));
R_ABORT_UNLESS(svc::CloseHandle(service_info->mitm_query_h));
/* Reset mitm members. */
service_info->mitm_port_h = svc::InvalidHandle;
service_info->mitm_query_h = svc::InvalidHandle;
service_info->mitm_process_id = os::InvalidProcessId;
}
return ResultSuccess();
}
Result DeclareFutureMitm(os::ProcessId process_id, ServiceName service) {
/* Acquire exclusive access to global state. */
std::scoped_lock lk(g_mutex);
/* Validate service name. */
R_TRY(ValidateServiceName(service));
/* Check that the process is registered and allowed to register the service. */
if (!IsInitialProcess(process_id)) {
ProcessInfo *proc = GetProcessInfo(process_id);
R_UNLESS(proc != nullptr, sm::ResultInvalidClient());
R_TRY(ValidateAccessControl(AccessControlEntry(proc->access_control, proc->access_control_size), service, true, false));
}
/* Check that mitm hasn't already been registered or declared. */
R_UNLESS(!HasMitm(service), sm::ResultAlreadyRegistered());
R_UNLESS(!HasFutureMitmDeclaration(service), sm::ResultAlreadyRegistered());
/* Try to forward declare it. */
R_TRY(AddFutureMitmDeclaration(service));
return ResultSuccess();
}
Result ClearFutureMitm(os::ProcessId process_id, ServiceName service) {
/* Acquire exclusive access to global state. */
std::scoped_lock lk(g_mutex);
/* Validate service name. */
R_TRY(ValidateServiceName(service));
/* Check that the process is registered and allowed to register the service. */
if (!IsInitialProcess(process_id)) {
ProcessInfo *proc = GetProcessInfo(process_id);
R_UNLESS(proc != nullptr, sm::ResultInvalidClient());
R_TRY(ValidateAccessControl(AccessControlEntry(proc->access_control, proc->access_control_size), service, true, false));
}
/* Check that a future mitm declaration is present or we have a mitm. */
if (HasMitm(service)) {
/* Validate that the service exists. */
ServiceInfo *service_info = GetServiceInfo(service);
R_UNLESS(service_info != nullptr, sm::ResultNotRegistered());
/* Validate that the client process_id is the mitm process. */
R_UNLESS(service_info->mitm_process_id == process_id, sm::ResultNotAllowed());
} else {
R_UNLESS(HasFutureMitmDeclaration(service), sm::ResultNotRegistered());
}
/* Clear the forward declaration. */
ClearFutureMitmDeclaration(service);
return ResultSuccess();
}
Result AcknowledgeMitmSession(MitmProcessInfo *out_info, svc::Handle *out_hnd, os::ProcessId process_id, ServiceName service) {
/* Acquire exclusive access to global state. */
std::scoped_lock lk(g_mutex);
/* Validate service name. */
R_TRY(ValidateServiceName(service));
/* Check that the process is registered. */
if (!IsInitialProcess(process_id)) {
ProcessInfo *proc = GetProcessInfo(process_id);
R_UNLESS(proc != nullptr, sm::ResultInvalidClient());
}
/* Validate that the service exists. */
ServiceInfo *service_info = GetServiceInfo(service);
R_UNLESS(service_info != nullptr, sm::ResultNotRegistered());
/* Validate that the client process_id is the mitm process, and that an acknowledgement is waiting. */
R_UNLESS(service_info->mitm_process_id == process_id, sm::ResultNotAllowed());
R_UNLESS(service_info->mitm_waiting_ack, sm::ResultNotAllowed());
/* Acknowledge. */
{
/* Copy the mitm info to output. */
GetMitmProcessInfo(out_info, service_info->mitm_waiting_ack_process_id);
/* Set the output handle. */
*out_hnd = service_info->mitm_fwd_sess_h;
service_info->mitm_fwd_sess_h = svc::InvalidHandle;
/* Clear acknowledgement-related fields. */
service_info->mitm_waiting_ack = false;
service_info->mitm_waiting_ack_process_id = os::InvalidProcessId;
}
/* Undefer requests to the session. */
TriggerResume(service);
return ResultSuccess();
}
/* Deferral extension (works around FS bug). */
Result EndInitialDefers() {
/* Acquire exclusive access to global state. */
std::scoped_lock lk(g_mutex);
/* Note that we have ended the initial deferral period. */
g_ended_initial_defers = true;
/* This might undefer some requests. */
for (const auto &service_name : InitiallyDeferredServices) {
TriggerResume(service_name);
}
return ResultSuccess();
}
}
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