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Atmosphere/stratosphere/sm/source/sm_registration.cpp

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/*
* Copyright (c) 2018 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 <switch.h>
#include <algorithm>
#include <stratosphere/servicesession.hpp>
#include "sm_registration.hpp"
#include "meta_tools.hpp"
static std::array<Registration::Process, REGISTRATION_LIST_MAX_PROCESS> g_process_list = {0};
static std::array<Registration::Service, REGISTRATION_LIST_MAX_SERVICE> g_service_list = {0};
static u64 g_initial_process_id_low = 0;
static u64 g_initial_process_id_high = 0;
static bool g_determined_initial_process_ids = false;
u64 GetServiceNameLength(u64 service) {
u64 service_name_len = 0;
while (service & 0xFF) {
service_name_len++;
service >>= 8;
}
return service_name_len;
}
/* Utilities. */
Registration::Process *Registration::GetProcessForPid(u64 pid) {
auto process_it = std::find_if(g_process_list.begin(), g_process_list.end(), member_equals_fn(&Process::pid, pid));
if (process_it == g_process_list.end()) {
return nullptr;
}
return &*process_it;
}
Registration::Process *Registration::GetFreeProcess() {
return GetProcessForPid(0);
}
Registration::Service *Registration::GetService(u64 service_name) {
auto service_it = std::find_if(g_service_list.begin(), g_service_list.end(), member_equals_fn(&Service::service_name, service_name));
if (service_it == g_service_list.end()) {
return nullptr;
}
return &*service_it;
}
Registration::Service *Registration::GetFreeService() {
return GetService(0);
}
bool Registration::IsValidForSac(u8 *sac, size_t sac_size, u64 service, bool is_host) {
u8 cur_ctrl;
u64 cur_service;
u64 service_for_compare;
bool cur_is_host;
size_t remaining = sac_size;
while (remaining) {
cur_ctrl = *sac++;
remaining--;
size_t cur_size = (cur_ctrl & 7) + 1;
if (cur_size > remaining) {
break;
}
cur_is_host = (cur_ctrl & 0x80) != 0;
cur_service = 0;
for (unsigned int i = 0; i < cur_size; i++) {
cur_service |= ((u64)sac[i]) << (8 * i);
}
/* Check if the last byte is a wildcard ('*') */
service_for_compare = service;
if (sac[cur_size - 1] == '*') {
u64 mask = U64_MAX;
for (unsigned int i = 0; i < 8 - (cur_size - 1); i++) {
mask >>= 8;
}
/* Mask cur_service, service with 0xFF.. up until the wildcard. */
cur_service &= mask;
service_for_compare &= mask;
}
if (cur_service == service_for_compare && (is_host == cur_is_host)) {
return true;
}
sac += cur_size;
remaining -= cur_size;
}
return false;
}
bool Registration::ValidateSacAgainstRestriction(u8 *r_sac, size_t r_sac_size, u8 *sac, size_t sac_size) {
u8 cur_ctrl;
u64 cur_service;
bool cur_is_host;
size_t remaining = sac_size;
while (remaining) {
cur_ctrl = *sac++;
remaining--;
size_t cur_size = (cur_ctrl & 7) + 1;
if (cur_size > remaining) {
break;
}
cur_is_host = (cur_ctrl & 0x80) != 0;
cur_service = 0;
for (unsigned int i = 0; i < cur_size; i++) {
cur_service |= ((u64)sac[i]) << (8 * i);
}
if (!IsValidForSac(r_sac, r_sac_size, cur_service, cur_is_host)) {
return false;
}
sac += cur_size;
remaining -= cur_size;
}
return true;
}
void Registration::CacheInitialProcessIdLimits() {
if (g_determined_initial_process_ids) {
return;
}
if (kernelAbove500()) {
svcGetSystemInfo(&g_initial_process_id_low, 2, 0, 0);
svcGetSystemInfo(&g_initial_process_id_high, 2, 0, 1);
} else {
g_initial_process_id_low = 0;
g_initial_process_id_high = REGISTRATION_INITIAL_PID_MAX;
}
g_determined_initial_process_ids = true;
}
bool Registration::IsInitialProcess(u64 pid) {
CacheInitialProcessIdLimits();
return g_initial_process_id_low <= pid && pid <= g_initial_process_id_high;
}
u64 Registration::GetInitialProcessId() {
CacheInitialProcessIdLimits();
return g_initial_process_id_low;
}
/* Process management. */
Result Registration::RegisterProcess(u64 pid, u8 *acid_sac, size_t acid_sac_size, u8 *aci0_sac, size_t aci0_sac_size) {
Registration::Process *proc = GetFreeProcess();
if (aci0_sac_size > REGISTRATION_MAX_SAC_SIZE) {
return 0x1215;
}
if (proc == NULL) {
return 0x215;
}
if (aci0_sac_size && !ValidateSacAgainstRestriction(acid_sac, acid_sac_size, aci0_sac, aci0_sac_size)) {
return 0x1015;
}
proc->pid = pid;
proc->sac_size = aci0_sac_size;
std::copy(aci0_sac, aci0_sac + aci0_sac_size, proc->sac);
return 0;
}
Result Registration::UnregisterProcess(u64 pid) {
Registration::Process *proc = GetProcessForPid(pid);
if (proc == NULL) {
return 0x415;
}
proc->pid = 0;
return 0;
}
/* Service management. */
bool Registration::HasService(u64 service) {
return std::any_of(g_service_list.begin(), g_service_list.end(), member_equals_fn(&Service::service_name, service));
}
Result Registration::GetServiceHandle(u64 pid, u64 service, Handle *out) {
Registration::Service *target_service = GetService(service);
if (target_service == NULL) {
/* Note: This defers the result until later. */
return RESULT_DEFER_SESSION;
}
*out = 0;
Result rc;
if (target_service->mitm_pid == 0 || target_service->mitm_pid == pid) {
rc = svcConnectToPort(out, target_service->port_h);
} else {
IpcCommand c;
ipcInitialize(&c);
struct {
u64 magic;
u64 cmd_id;
u64 pid;
} *info = ((decltype(info))ipcPrepareHeader(&c, sizeof(*info)));
info->magic = SFCI_MAGIC;
info->cmd_id = 65000;
info->pid = pid;
rc = ipcDispatch(target_service->mitm_query_h);
if (R_SUCCEEDED(rc)) {
IpcParsedCommand r;
ipcParse(&r);
struct {
u64 magic;
u64 result;
u64 should_mitm;
} *resp = ((decltype(resp))r.Raw);
rc = resp->result;
if (R_SUCCEEDED(rc)) {
if (resp->should_mitm) {
rc = svcConnectToPort(out, target_service->mitm_port_h);
} else {
rc = svcConnectToPort(out, target_service->port_h);
}
}
}
if (R_FAILED(rc)) {
rc = svcConnectToPort(out, target_service->port_h);
}
}
if (R_FAILED(rc)) {
if ((rc & 0x3FFFFF) == 0xE01) {
return 0x615;
}
}
return rc;
}
Result Registration::GetServiceForPid(u64 pid, u64 service, Handle *out) {
if (!service) {
return 0xC15;
}
u64 service_name_len = GetServiceNameLength(service);
/* If the service has bytes after a null terminator, that's no good. */
if (service_name_len != 8 && (service >> (8 * service_name_len))) {
return 0xC15;
}
if (!IsInitialProcess(pid)) {
Registration::Process *proc = GetProcessForPid(pid);
if (proc == NULL) {
return 0x415;
}
if (!IsValidForSac(proc->sac, proc->sac_size, service, false)) {
return 0x1015;
}
}
return GetServiceHandle(pid, service, out);
}
Result Registration::RegisterServiceForPid(u64 pid, u64 service, u64 max_sessions, bool is_light, Handle *out) {
if (!service) {
return 0xC15;
}
u64 service_name_len = GetServiceNameLength(service);
/* If the service has bytes after a null terminator, that's no good. */
if (service_name_len != 8 && (service >> (8 * service_name_len))) {
return 0xC15;
}
if (!IsInitialProcess(pid)) {
Registration::Process *proc = GetProcessForPid(pid);
if (proc == NULL) {
return 0x415;
}
if (!IsValidForSac(proc->sac, proc->sac_size, service, true)) {
return 0x1015;
}
}
if (HasService(service)) {
return 0x815;
}
#ifdef SM_MINIMUM_SESSION_LIMIT
if (max_sessions < SM_MINIMUM_SESSION_LIMIT) {
max_sessions = SM_MINIMUM_SESSION_LIMIT;
}
#endif
Registration::Service *free_service = GetFreeService();
if (free_service == NULL) {
return 0xA15;
}
*out = 0;
*free_service = (const Registration::Service){0};
Result rc = svcCreatePort(out, &free_service->port_h, max_sessions, is_light, (char *)&free_service->service_name);
if (R_SUCCEEDED(rc)) {
free_service->service_name = service;
free_service->owner_pid = pid;
free_service->max_sessions = max_sessions;
free_service->is_light = is_light;
}
return rc;
}
Result Registration::RegisterServiceForSelf(u64 service, u64 max_sessions, bool is_light, Handle *out) {
u64 pid;
Result rc = svcGetProcessId(&pid, CUR_PROCESS_HANDLE);
if (R_FAILED(rc)) {
return rc;
}
u64 service_name_len = GetServiceNameLength(service);
/* If the service has bytes after a null terminator, that's no good. */
if (service_name_len != 8 && (service >> (8 * service_name_len))) {
return 0xC15;
}
if (HasService(service)) {
return 0x815;
}
#ifdef SM_MINIMUM_SESSION_LIMIT
if (max_sessions < SM_MINIMUM_SESSION_LIMIT) {
max_sessions = SM_MINIMUM_SESSION_LIMIT;
}
#endif
Registration::Service *free_service = GetFreeService();
if (free_service == NULL) {
return 0xA15;
}
*out = 0;
*free_service = (const Registration::Service){0};
rc = svcCreatePort(out, &free_service->port_h, max_sessions, is_light, (char *)&free_service->service_name);
if (R_SUCCEEDED(rc)) {
free_service->service_name = service;
free_service->owner_pid = pid;
free_service->max_sessions = max_sessions;
free_service->is_light = is_light;
}
return rc;
}
Result Registration::UnregisterServiceForPid(u64 pid, u64 service) {
if (!service) {
return 0xC15;
}
u64 service_name_len = GetServiceNameLength(service);
/* If the service has bytes after a null terminator, that's no good. */
if (service_name_len != 8 && (service >> (8 * service_name_len))) {
return 0xC15;
}
Registration::Service *target_service = GetService(service);
if (target_service == NULL) {
return 0xE15;
}
if (!IsInitialProcess(pid) && target_service->owner_pid != pid) {
return 0x1015;
}
svcCloseHandle(target_service->port_h);
svcCloseHandle(target_service->mitm_port_h);
svcCloseHandle(target_service->mitm_query_h);
*target_service = (const Registration::Service){0};
return 0;
}
Result Registration::InstallMitmForPid(u64 pid, u64 service, Handle *out, Handle *query_out) {
if (!service) {
return 0xC15;
}
u64 service_name_len = GetServiceNameLength(service);
/* If the service has bytes after a null terminator, that's no good. */
if (service_name_len != 8 && (service >> (8 * service_name_len))) {
return 0xC15;
}
/* Verify we're allowed to mitm the service. */
if (!IsInitialProcess(pid)) {
Registration::Process *proc = GetProcessForPid(pid);
if (proc == NULL) {
return 0x415;
}
if (!IsValidForSac(proc->sac, proc->sac_size, service, true)) {
return 0x1015;
}
}
/* Verify the service exists. */
Registration::Service *target_service = GetService(service);
if (target_service == NULL) {
return 0xE15;
}
/* Verify the service isn't already being mitm'd. */
if (target_service->mitm_pid != 0) {
return 0x815;
}
*out = 0;
u64 x = 0;
Result rc = svcCreatePort(out, &target_service->mitm_port_h, target_service->max_sessions, target_service->is_light, (char *)&x);
if (R_SUCCEEDED(rc) && R_SUCCEEDED((rc = svcCreateSession(query_out, &target_service->mitm_query_h, 0, 0)))) {
target_service->mitm_pid = pid;
}
return rc;
}
Result Registration::UninstallMitmForPid(u64 pid, u64 service) {
if (!service) {
return 0xC15;
}
u64 service_name_len = GetServiceNameLength(service);
/* If the service has bytes after a null terminator, that's no good. */
if (service_name_len != 8 && (service >> (8 * service_name_len))) {
return 0xC15;
}
Registration::Service *target_service = GetService(service);
if (target_service == NULL) {
return 0xE15;
}
if (!IsInitialProcess(pid) && target_service->mitm_pid != pid) {
return 0x1015;
}
svcCloseHandle(target_service->mitm_port_h);
svcCloseHandle(target_service->mitm_query_h);
target_service->mitm_pid = 0;
return 0;
}
Result Registration::AssociatePidTidForMitm(u64 pid, u64 tid) {
for (auto &service : g_service_list) {
if (service.mitm_pid) {
IpcCommand c;
ipcInitialize(&c);
struct {
u64 magic;
u64 cmd_id;
u64 pid;
u64 tid;
} *info = ((decltype(info))ipcPrepareHeader(&c, sizeof(*info)));
info->magic = SFCI_MAGIC;
info->cmd_id = 65001;
info->pid = pid;
info->tid = tid;
ipcDispatch(service.mitm_query_h);
}
}
return 0x0;
}
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