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Improve speed of finding FS keys

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shchmue 2019-01-04 13:40:30 -05:00
parent 49c6fd8dc7
commit 352c39ae8a
6 changed files with 81 additions and 49 deletions
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5
source/Key.cpp
View file

@ -124,7 +124,7 @@ byte_vector Key::cmac(byte_vector data) {
return dest;
}
void Key::find_key(const byte_vector &buffer) {
void Key::find_key(const byte_vector &buffer, size_t start) {
if ((buffer.size() == 0) || (found()))
return;
@ -136,10 +136,11 @@ void Key::find_key(const byte_vector &buffer) {
return;
std::copy(buffer.begin(), buffer.begin() + length, std::back_inserter(key));
is_found = true;
return;
}
// hash every length-sized byte chunk in buffer until it matches member hash
for (size_t i = 0; i < buffer.size() - length; i++) {
for (size_t i = start; i < buffer.size() - length; i++) {
if (xx_hash == XXHash64::hash(buffer.data() + i, length, 0)) {
// double-check sha256 since xxhash64 isn't as collision-safe
Common::sha256(buffer.data() + i, temp_hash, length);

5
source/Key.hpp
View file

@ -54,18 +54,17 @@ public:
// return CMAC of data
byte_vector cmac(byte_vector data);
// find key in buffer by hash, optionally specify start offset
void find_key(const byte_vector &buffer);
void find_key(const byte_vector &buffer, size_t start = 0);
// get key encryption key
byte_vector generate_kek(Key &master_key, const Key &kek_seed, const Key &key_seed);
byte_vector key;
private:
std::string name;
u64 xx_hash;
byte_vector hash;
u8 length;
bool is_found = false;
private:
static size_t saved_key_count;
};

66
source/KeyCollection.cpp
View file

@ -22,9 +22,9 @@
#include <algorithm>
#include <chrono>
#include <functional>
#include <set>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <stdio.h>
@ -158,10 +158,10 @@ KeyCollection::KeyCollection() {
sd_card_kek_source = {"sd_card_kek_source", 0xc408d710a3b821eb, {
0x6B, 0x2E, 0xD8, 0x77, 0xC2, 0xC5, 0x23, 0x34, 0xAC, 0x51, 0xE5, 0x9A, 0xBF, 0xA7, 0xEC, 0x45,
0x7F, 0x4A, 0x7D, 0x01, 0xE4, 0x62, 0x91, 0xE9, 0xF2, 0xEA, 0xA4, 0x5F, 0x01, 0x1D, 0x24, 0xB7}, 0x10};
sd_card_nca_key_source = {"sd_card_nca_key_source", 0xbea347c9f8472947, {
sd_card_nca_key_source = {"sd_card_nca_key_source", 0xb026106d9699fec0, { // xxhash of first 0x10 bytes
0x2E, 0x75, 0x1C, 0xEC, 0xF7, 0xD9, 0x3A, 0x2B, 0x95, 0x7B, 0xD5, 0xFF, 0xCB, 0x08, 0x2F, 0xD0,
0x38, 0xCC, 0x28, 0x53, 0x21, 0x9D, 0xD3, 0x09, 0x2C, 0x6D, 0xAB, 0x98, 0x38, 0xF5, 0xA7, 0xCC}, 0x20};
sd_card_save_key_source = {"sd_card_save_key_source", 0xf87fe8c3688c3022, {
sd_card_save_key_source = {"sd_card_save_key_source", 0x9697ba2fec3d3ed1, { // xxhash of first 0x10 bytes
0xD4, 0x82, 0x74, 0x35, 0x63, 0xD3, 0xEA, 0x5D, 0xCD, 0xC3, 0xB7, 0x4E, 0x97, 0xC9, 0xAC, 0x8A,
0x34, 0x21, 0x64, 0xFA, 0x04, 0x1A, 0x1D, 0xC8, 0x0F, 0x17, 0xF6, 0xD3, 0x1E, 0x4B, 0xC0, 0x1C}, 0x20};
@ -195,10 +195,6 @@ KeyCollection::KeyCollection() {
};
fs_rodata_keys = {
&bis_kek_source,
&bis_key_source_00,
&bis_key_source_01,
&bis_key_source_02,
&header_kek_source,
&key_area_key_application_source,
&key_area_key_ocean_source,
@ -216,25 +212,10 @@ KeyCollection::KeyCollection() {
});
}
package1ldr_keys = {
&keyblob_mac_key_source,
&master_key_source,
&per_console_key_source
};
ssl_keys = {
&ssl_rsa_kek_source_x,
&ssl_rsa_kek_source_y
};
tz_keys = {
&aes_kek_generation_source,
&package2_key_source,
&titlekek_source,
&retail_specific_aes_key_source,
&aes_kek_seed_01,
&aes_kek_seed_03
};
};
void KeyCollection::get_keys() {
@ -361,15 +342,22 @@ void KeyCollection::get_memory_keys() {
FSRodata.get_from_memory(FS_TID, SEG_RODATA);
FSData.get_from_memory(FS_TID, SEG_DATA);
for (auto k : fs_rodata_keys)
k->find_key(FSRodata.data);
FSRodata.find_keys(fs_rodata_keys);
header_key_source.find_key(FSData.data);
size_t i = 0;
/*for ( ; i < FSData.data.size(); i++) {
// speeds things up but i'm not 100% sure this is always here
if (*reinterpret_cast<u128 *>(FSData.data.data() + i) == 0x10001)
break;
}*/
header_key_source.find_key(FSData.data, i);
SSLRodata.get_from_memory(SSL_TID, SEG_RODATA);
// using find_keys on these is actually slower
for (auto k : ssl_keys)
k->find_key(SSLRodata.data);
// firmware 1.0.0 doesn't have the ES keys
if (!kernelAbove200())
return;
ESRodata.get_from_memory(ES_TID, SEG_RODATA);
@ -558,7 +546,7 @@ void KeyCollection::get_titlekeys() {
esListCommonTicket(&ids_written, common_rights_ids, sizeof(common_rights_ids));
esListPersonalizedTicket(&ids_written, personalized_rights_ids, sizeof(personalized_rights_ids));
esExit();
if ((common_count == 0) && (personalized_count == 0))
if (common_count + personalized_count == 0)
return;
/*
@ -567,7 +555,7 @@ void KeyCollection::get_titlekeys() {
this would be fine, except we have to match the exact list so we don't stop too early
*/
char titlekey_block[0x100], buffer[TITLEKEY_BUFFER_SIZE], rights_id_string[0x21], titlekey_string[0x21];
std::set<std::string> rights_ids;
std::unordered_set<std::string> rights_ids;
for (size_t i = 0; i < common_count; i++) {
for (size_t j = 0; j < 0x10; j++) {
sprintf(&rights_id_string[j*2], "%02x", common_rights_ids[i].c[j]);
@ -620,7 +608,7 @@ void KeyCollection::get_titlekeys() {
for (size_t k = 0; k < 0x10; k++)
sprintf(&rights_id_string[k*2], "%02x", buffer[j + 0x2a0 + k]);
// skip if rights id found but not reported by es
// skip if rights id not reported by es
if (rights_ids.find(rights_id_string) == rights_ids.end())
continue;
// skip if rights id already in map
@ -648,8 +636,18 @@ void KeyCollection::get_titlekeys() {
for (size_t i = 0; i < bytes_read; i += 0x4000) {
for (size_t j = i; j < i + 0x4000; j += 0x400) {
if (*reinterpret_cast<u32 *>(&buffer[j]) == 0x10004) {
for (size_t k = 0; k < 0x10; k++)
sprintf(&rights_id_string[k*2], "%02x", buffer[j + 0x2a0 + k]);
// skip if rights id not reported by es
if (rights_ids.find(rights_id_string) == rights_ids.end())
continue;
// skip if rights id already in map
if (titlekeys.find(rights_id_string) != titlekeys.end())
continue;
std::copy(buffer + j + 0x180, buffer + j + 0x280, titlekey_block);
splUserExpMod(titlekey_block, N, D, 0x100, M);
// decrypts the titlekey from personalized ticket
@ -666,16 +664,6 @@ void KeyCollection::get_titlekeys() {
if (!std::equal(db, db + 0x20, null_hash))
continue;
for (size_t k = 0; k < 0x10; k++)
sprintf(&rights_id_string[k*2], "%02x", buffer[j + 0x2a0 + k]);
// skip if rights id found but not reported by es
if (rights_ids.find(rights_id_string) == rights_ids.end())
continue;
// skip if rights id already in map
if (titlekeys.find(rights_id_string) != titlekeys.end())
continue;
for (size_t k = 0; k < 0x10; k++)
sprintf(&titlekey_string[k*2], "%02x", db[k + 0xcf]);
titlekeys[rights_id_string] = titlekey_string;

2
source/KeyCollection.hpp
View file

@ -113,7 +113,7 @@ private:
titlekek;
std::vector<Key *>
es_keys, fs_rodata_keys, package1ldr_keys, ssl_keys, tz_keys;
es_keys, fs_rodata_keys, ssl_keys;
// hash of empty string used to verify titlekeys for personalized tickets
static const u8 null_hash[0x20];

46
source/KeyLocation.cpp
View file

@ -16,9 +16,15 @@
#include "KeyLocation.hpp"
#include "Common.hpp"
#include "xxhash64.h"
#include <algorithm>
#include <unordered_map>
#include <switch.h>
void KeyLocation::get_from_memory(u64 tid, u8 segMask) {
void KeyLocation::get_from_memory(u64 tid, u8 seg_mask) {
Handle debug_handle = INVALID_HANDLE;
u64 d[8];
@ -62,10 +68,10 @@ void KeyLocation::get_from_memory(u64 tid, u8 segMask) {
{
svcQueryDebugProcessMemory(&mem_info, &page_info, debug_handle, addr);
// weird code to allow for bitmasking segments
if ((mem_info.perm & Perm_R) &&
if ((mem_info.perm & Perm_R) &&
((mem_info.type & 0xff) >= MemType_CodeStatic) &&
((mem_info.type & 0xff) < MemType_Heap) &&
((segment <<= 1) >> 1 & segMask) > 0)
((segment <<= 1) >> 1 & seg_mask) > 0)
{
data.resize(data.size() + mem_info.size);
if(R_FAILED(svcReadDebugProcessMemory(data.data() + data.size() - mem_info.size, debug_handle, mem_info.addr, mem_info.size))) {
@ -86,4 +92,38 @@ void KeyLocation::get_keyblobs() {
data.resize(0x200 * KNOWN_KEYBLOBS);
fsStorageRead(&boot0, KEYBLOB_OFFSET, data.data(), data.size());
fsStorageClose(&boot0);
}
void KeyLocation::find_keys(std::vector<Key *> &keys) {
if (data.size() == 0)
return;
u8 temp_hash[0x20];
size_t key_indices_left = keys.size();
u64 hash = 0;
std::unordered_map<u64, size_t> hash_index;
for (size_t i = 0; i < keys.size(); i++)
hash_index[keys[i]->xx_hash] = i;
// hash every length-sized byte chunk in data until it matches a key hash
for (size_t i = 0; i < data.size() - 0x10; i++) {
hash = XXHash64::hash(data.data() + i, 0x10, 0);
auto search = hash_index.find(hash);
if (search == hash_index.end()) {
continue;
}
size_t key_index = hash_index[hash];
u8 key_length = keys[key_index]->length;
// double-check sha256 since xxhash64 isn't as collision-safe
Common::sha256(data.data() + i, temp_hash, key_length);
if (!std::equal(keys[key_index]->hash.begin(), keys[key_index]->hash.end(), temp_hash))
continue;
std::copy(data.begin() + i, data.begin() + i + key_length, std::back_inserter(keys[key_index]->key));
keys[key_index]->is_found = true;
key_indices_left--;
if (key_indices_left == 0)
return;
hash_index.erase(hash);
i += key_length - 1;
}
}

6
source/KeyLocation.hpp
View file

@ -16,6 +16,8 @@
#pragma once
#include "Key.hpp"
#include <vector>
#include <switch/types.h>
@ -44,9 +46,11 @@ typedef std::vector<u8> byte_vector;
class KeyLocation {
public:
// get memory in requested segments from running title
void get_from_memory(u64 tid, u8 segMask);
void get_from_memory(u64 tid, u8 seg_mask);
// get keyblobs from BOOT0
void get_keyblobs();
// locate keys in data
void find_keys(std::vector<Key *> &keys);
// data found by get functions
byte_vector data;