From 1dd5e8785dffb7f71be1df6b56fd6867e8bfe831 Mon Sep 17 00:00:00 2001 From: d0k3 Date: Sun, 21 May 2017 20:57:30 +0200 Subject: [PATCH] Handle installation for N3DS / 3dssafe users --- source/crypto/keydb.c | 230 ++++++++++++++++++++++++++++++++++++++++++ source/crypto/keydb.h | 23 +++++ source/installer.c | 2 +- source/nand/nand.c | 16 ++- 4 files changed, 269 insertions(+), 2 deletions(-) create mode 100644 source/crypto/keydb.c create mode 100644 source/crypto/keydb.h diff --git a/source/crypto/keydb.c b/source/crypto/keydb.c new file mode 100644 index 0000000..5cbb45c --- /dev/null +++ b/source/crypto/keydb.c @@ -0,0 +1,230 @@ +#include "keydb.h" +#include "aes.h" +#include "sha.h" +#include "ff.h" + +#define PATH_KEYDB INPUT_PATH "/" KEYDB_NAME + +typedef struct { + u8 slot; // keyslot, 0x00...0x39 + char type; // type 'X' / 'Y' / 'N' for normalKey / 'I' for IV + char id[10]; // key ID for special keys, all zero for standard keys +} __attribute__((packed)) AesKeyDesc; + +typedef struct { + AesKeyDesc desc; // slot, type, id + u8 keyUnitType; // 0 for ALL units / 1 for devkit exclusive / 2 for retail exclusive + u8 keySha256[32]; // SHA-256 of the key +} __attribute__((packed)) AesKeyHashInfo; + +typedef struct { + u8 slot; // keyslot, 0x00...0x39 + u8 keyUnitType; // 0 for ALL units / 1 for devkit exclusive / 2 for retail exclusive + u8 sample[16]; // sample data, encoded with src = keyY = ctr = { 0 } +} __attribute__((packed)) AesNcchSampleInfo; + +static u64 keyState = 0; +static u64 keyXState = 0; +static u64 keyYState = 0; + +u32 GetUnitKeysType(void) +{ + static u32 keys_type = KEYS_UNKNOWN; + + if (keys_type == KEYS_UNKNOWN) { + static const u8 slot0x2CSampleRetail[16] = { + 0xBC, 0xC4, 0x16, 0x2C, 0x2A, 0x06, 0x91, 0xEE, 0x47, 0x18, 0x86, 0xB8, 0xEB, 0x2F, 0xB5, 0x48 }; + static const u8 slot0x2CSampleDevkit[16] = { + 0x29, 0xB5, 0x5D, 0x9F, 0x61, 0xAC, 0xD2, 0x28, 0x22, 0x23, 0xFB, 0x57, 0xDD, 0x50, 0x8A, 0xF5 }; + static u8 zeroes[16] = { 0 }; + u8 sample[16] = { 0 }; + setup_aeskeyY(0x2C, zeroes); + use_aeskey(0x2C); + set_ctr(zeroes); + aes_decrypt(sample, sample, 1, AES_CNT_CTRNAND_MODE); + if (memcmp(sample, slot0x2CSampleRetail, 16) == 0) { + keys_type = KEYS_RETAIL; + } else if (memcmp(sample, slot0x2CSampleDevkit, 16) == 0) { + keys_type = KEYS_DEVKIT; + } + } + + return keys_type; +} + +void CryptAesKeyInfo(AesKeyInfo* info) { + static u8 zeroes[16] = { 0 }; + u8 ctr[16] = { 0 }; + memcpy(ctr, (void*) info, 12); // CTR -> slot + type + id + zeroes + setup_aeskeyY(0x2C, zeroes); + use_aeskey(0x2C); + set_ctr(ctr); + aes_decrypt(info->key, info->key, 1, AES_CNT_CTRNAND_MODE); + info->isEncrypted = !info->isEncrypted; +} + +u32 CheckAesKeyInfo(u8* key, u32 keyslot, char type, char* id) +{ + static const AesKeyHashInfo keyHashes[] = { + { { 0x05, 'Y', "" }, KEYS_RETAIL, // Retail N3DS CTRNAND key SHA256 + { 0x98, 0x24, 0x27, 0x14, 0x22, 0xB0, 0x6B, 0xF2, 0x10, 0x96, 0x9C, 0x36, 0x42, 0x53, 0x7C, 0x86, + 0x62, 0x22, 0x5C, 0xFD, 0x6F, 0xAE, 0x9B, 0x0A, 0x85, 0xA5, 0xCE, 0x21, 0xAA, 0xB6, 0xC8, 0x4D } + }, + { { 0x18, 'X', "" }, KEYS_RETAIL, // Retail NCCH Secure3 key SHA256 + { 0x76, 0xC7, 0x6B, 0x65, 0x5D, 0xB8, 0x52, 0x19, 0xC5, 0xD3, 0x5D, 0x51, 0x7F, 0xFA, 0xF7, 0xA4, + 0x3E, 0xBA, 0xD6, 0x6E, 0x31, 0xFB, 0xDD, 0x57, 0x43, 0x92, 0x59, 0x37, 0xA8, 0x93, 0xCC, 0xFC } + }, + { { 0x1B, 'X', "" }, KEYS_RETAIL, // Retail NCCH Secure4 key SHA256 + { 0x9A, 0x20, 0x1E, 0x7C, 0x37, 0x37, 0xF3, 0x72, 0x2E, 0x5B, 0x57, 0x8D, 0x11, 0x83, 0x7F, 0x19, + 0x7C, 0xA6, 0x5B, 0xF5, 0x26, 0x25, 0xB2, 0x69, 0x06, 0x93, 0xE4, 0x16, 0x53, 0x52, 0xC6, 0xBB } + }, + { { 0x25, 'X', "" }, KEYS_RETAIL, // Retail NCCH 7x key SHA256 + { 0x7E, 0x87, 0x8D, 0xDE, 0x92, 0x93, 0x8E, 0x4C, 0x71, 0x7D, 0xD5, 0x3D, 0x1E, 0xA3, 0x5A, 0x75, + 0x63, 0x3F, 0x51, 0x30, 0xD8, 0xCF, 0xD7, 0xC7, 0x6C, 0x8F, 0x4A, 0x8F, 0xB8, 0x70, 0x50, 0xCD } + }/*, + { { 0x18, 'X', "" }, KEYS_DEVKIT, // DevKit NCCH Secure3 key SHA256 + { 0x08, 0xE1, 0x09, 0x62, 0xF6, 0x5A, 0x09, 0xAA, 0x12, 0x2C, 0x7C, 0xBE, 0xDE, 0xA1, 0x9C, 0x4B, + 0x5C, 0x9A, 0x8A, 0xC3, 0xD9, 0x8E, 0xA1, 0x62, 0x04, 0x11, 0xD7, 0xE8, 0x55, 0x70, 0xA6, 0xC2 } + }, + { { 0x1B, 'X', "" }, KEYS_DEVKIT, // DevKit NCCH Secure4 key SHA256 + { 0xA5, 0x3C, 0x3E, 0x5D, 0x09, 0x5C, 0x73, 0x35, 0x21, 0x79, 0x3F, 0x2E, 0x4C, 0x10, 0xCA, 0xAE, + 0x87, 0x83, 0x51, 0x53, 0x46, 0x0B, 0x52, 0x39, 0x9B, 0x00, 0x62, 0xF6, 0x39, 0xCB, 0x62, 0x16 } + }*/ + }; + + u8 keySha256[32]; + sha_quick(keySha256, key, 16, SHA256_MODE); + for (u32 p = 0; p < sizeof(keyHashes) / sizeof(AesKeyHashInfo); p++) { + if ((keyHashes[p].desc.slot != keyslot) || (keyHashes[p].desc.type != type)) + continue; + if ((!id && keyHashes[p].desc.id[0]) || (id && strncmp(id, keyHashes[p].desc.id, 10) != 0)) + continue; + if (keyHashes[p].keyUnitType && (keyHashes[p].keyUnitType != GetUnitKeysType())) + continue; + if (memcmp(keySha256, keyHashes[p].keySha256, 32) == 0) { + return 0; + } + } + + return 1; +} + +u32 CheckKeySlot(u32 keyslot, char type) +{ + static const AesNcchSampleInfo keyNcchSamples[] = { + { 0x18, KEYS_RETAIL, // Retail NCCH Secure3 + { 0x78, 0xBB, 0x84, 0xFA, 0xB3, 0xA2, 0x49, 0x83, 0x9E, 0x4F, 0x50, 0x7B, 0x17, 0xA0, 0xDA, 0x23 } }, + { 0x1B, KEYS_RETAIL, // Retail NCCH Secure4 + { 0xF3, 0x6F, 0x84, 0x7E, 0x59, 0x43, 0x6E, 0xD5, 0xA0, 0x40, 0x4C, 0x71, 0x19, 0xED, 0xF7, 0x0A } }, + { 0x25, KEYS_RETAIL, // Retail NCCH 7x + { 0x34, 0x7D, 0x07, 0x48, 0xAE, 0x5D, 0xFB, 0xB0, 0xF5, 0x86, 0xD6, 0xB5, 0x14, 0x65, 0xF1, 0xFF } }, + { 0x18, KEYS_DEVKIT, // DevKit NCCH Secure3 + { 0x20, 0x8B, 0xB5, 0x61, 0x94, 0x18, 0x6A, 0x84, 0x91, 0xD6, 0x37, 0x27, 0x91, 0xF3, 0x53, 0xC9 } }, + { 0x1B, KEYS_DEVKIT, // DevKit NCCH Secure4 + { 0xB3, 0x9D, 0xC1, 0xDB, 0x5B, 0x0C, 0xE7, 0x60, 0xBE, 0xAD, 0x5A, 0xBF, 0xD0, 0x86, 0x99, 0x88 } }, + { 0x25, KEYS_DEVKIT, // DevKit NCCH 7x + { 0xBC, 0x83, 0x7C, 0xC9, 0x99, 0xC8, 0x80, 0x9E, 0x8A, 0xDE, 0x4A, 0xFA, 0xAA, 0x72, 0x08, 0x28 } } + }; + u64* state = (type == 'X') ? &keyXState : (type == 'Y') ? &keyYState : (type == 'N') ? &keyState : NULL; + + // just to be safe... + if (keyslot >= 0x40) + return 1; + + // check if key is already loaded + if ((type != 'I') && ((*state >> keyslot) & 1)) + return 0; + + // if is not, we may still be able to verify the currently set one (for NCCH keys) + for (u32 p = 0; (type == 'X') && (p < sizeof(keyNcchSamples) / sizeof(AesNcchSampleInfo)); p++) { + if (keyNcchSamples[p].slot != keyslot) // only for keyslots in the keyNcchSamples table! + continue; + if (keyNcchSamples[p].keyUnitType && (keyNcchSamples[p].keyUnitType != GetUnitKeysType())) + continue; + u8 zeroes[16] = { 0 }; + u8 sample[16] = { 0 }; + setup_aeskeyY(keyslot, zeroes); + use_aeskey(keyslot); + set_ctr(zeroes); + aes_decrypt(sample, sample, 1, AES_CNT_CTRNAND_MODE); + if (memcmp(keyNcchSamples[p].sample, sample, 16) == 0) { + keyXState |= (u64) 1 << keyslot; + return 0; + } + } + + // not set up if getting here + return 1; +} + +u32 LoadKeyFromFile(u8* key, u32 keyslot, char type, char* id) +{ + u8 keystore[16] __attribute__((aligned(32))) = {0}; + bool found = false; + FIL fp; + UINT btr; + + // use keystore if key == NULL + if (!key) key = keystore; + + // checking the obvious + if ((keyslot >= 0x40) || ((type != 'X') && (type != 'Y') && (type != 'N') && (type != 'I'))) + return 1; + + // check if already loaded + if (!id && (CheckKeySlot(keyslot, type) == 0)) return 0; + // try to get key from 'aeskeydb.bin' file + AesKeyInfo info; + if (f_open(&fp, PATH_KEYDB, FA_READ | FA_OPEN_EXISTING) == FR_OK) { + while ((f_read(&fp, &info, sizeof(AesKeyInfo), &btr) == FR_OK) && (btr == sizeof(AesKeyInfo))) { + if ((info.slot == keyslot) && (info.type == type) && + ((!id && !(info.id[0])) || (id && (strncmp(id, info.id, 10) == 0))) && + (!info.keyUnitType || (info.keyUnitType == GetUnitKeysType()))) { + found = true; + if (info.isEncrypted) + CryptAesKeyInfo(&info); + memcpy(key, info.key, 16); + break; + } + } + f_close(&fp); + } + + // load legacy slot0x??Key?.bin file instead + if (!found && (type != 'I')) { + char path[64]; + snprintf(path, 64, "%s/slot0x%02lXKey%s.bin", INPUT_PATH, keyslot, + (id) ? id : (type == 'X') ? "X" : (type == 'Y') ? "Y" : ""); + if (f_open(&fp, path, FA_READ | FA_OPEN_EXISTING) == FR_OK) { + if ((f_read(&fp, key, 16, &btr) == FR_OK) && (btr == 16)) + found = true; + f_close(&fp); + } + } + + // key still not found (duh) + if (!found) return 1; // out of options here + + // done if this is an IV + if (type == 'I') return 0; + + // verify key (verification is disabled) + // if (CheckAesKeyInfo(key, keyslot, type, id) != 0) return 1; + + // now, setup the key + if (type == 'X') { + setup_aeskeyX(keyslot, key); + keyXState |= (u64) 1 << keyslot; + } else if (type == 'Y') { + setup_aeskeyY(keyslot, key); + keyYState |= (u64) 1 << keyslot; + } else { // normalKey includes keyX & keyY + setup_aeskey(keyslot, key); + keyState |= (u64) 1 << keyslot; + keyXState |= (u64) 1 << keyslot; + keyYState |= (u64) 1 << keyslot; + } + use_aeskey(keyslot); + + return 0; +} diff --git a/source/crypto/keydb.h b/source/crypto/keydb.h new file mode 100644 index 0000000..f911c0a --- /dev/null +++ b/source/crypto/keydb.h @@ -0,0 +1,23 @@ +#pragma once + +#include "common.h" + +#define KEYDB_NAME "aeskeydb.bin" + +#define KEYS_UNKNOWN 0 +#define KEYS_DEVKIT 1 +#define KEYS_RETAIL 2 + +typedef struct { + u8 slot; // keyslot, 0x00...0x3F + char type; // type 'X' / 'Y' / 'N' for normalKey / 'I' for IV + char id[10]; // key ID for special keys, all zero for standard keys + u8 reserved[2]; // reserved space + u8 keyUnitType; // 0 for ALL units / 1 for retail exclusive / 2 for devkit exclusive + u8 isEncrypted; // 0 if not / anything else if it is + u8 key[16]; +} __attribute__((packed)) AesKeyInfo; + +u32 GetUnitKeysType(void); +void CryptAesKeyInfo(AesKeyInfo* info); +u32 LoadKeyFromFile(u8* key, u32 keyslot, char type, char* id); diff --git a/source/installer.c b/source/installer.c index ac5fc74..5a475c3 100644 --- a/source/installer.c +++ b/source/installer.c @@ -80,7 +80,6 @@ u32 SafeB9SInstaller(void) { // step #0 - a9lh check - InitNandCrypto(); // for sector0x96 crypto and NAND drives snprintf(msgA9lh, 64, (IS_A9LH && !IS_SIGHAX) ? "installed" : "not installed"); statusA9lh = STATUS_GREEN; ShowInstallerStatus(); @@ -98,6 +97,7 @@ u32 SafeB9SInstaller(void) { statusSdCard = STATUS_RED; return 1; } + InitNandCrypto(); // for sector0x96 crypto and NAND drives snprintf(msgSdCard, 64, "%lluMB/%lluMB free", sdFree / (1024 * 1024), sdTotal / (1024 * 1024)); statusSdCard = (sdFree < MIN_SD_FREE) ? STATUS_RED : STATUS_GREEN; ShowInstallerStatus(); diff --git a/source/nand/nand.c b/source/nand/nand.c index 632f9c2..ccc7597 100644 --- a/source/nand/nand.c +++ b/source/nand/nand.c @@ -1,4 +1,5 @@ #include "nand.h" +#include "keydb.h" #include "aes.h" #include "sha.h" #include "sdmmc.h" @@ -94,8 +95,21 @@ bool InitNandCrypto(void) if (IS_A9LH) { // for a9lh // store the current SHA256 from register memcpy(OtpSha256, (void*) REG_SHAHASH, 32); + if (!CheckSector0x96Crypto()) { // 3dssafe users be damned (no offense meant to mashers) + u8 __attribute__((aligned(32))) otp0x90[0x90]; + u8 __attribute__((aligned(32))) otp_key[0x10]; + u8 __attribute__((aligned(32))) otp_iv[0x10]; + memcpy(otp0x90, (u8*) 0x01FFB800, 0x90); + if ((LoadKeyFromFile(otp_key, 0x11, 'N', "OTP") == 0) && + (LoadKeyFromFile(otp_iv, 0x11, 'I', "IVOTP") == 0)) { + setup_aeskey(0x11, otp_key); + use_aeskey(0x11); + cbc_encrypt(otp0x90, otp0x90, 0x90 / 0x10, AES_CNT_TITLEKEY_ENCRYPT_MODE, otp_iv); + sha_quick(OtpSha256, otp0x90, 0x90, SHA256_MODE); + } + } } - + // part #1: Get NAND CID, set up TWL/CTR counter u32 NandCid[4]; u8 shasum[32];