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https://github.com/d0k3/GodMode9.git
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24c31f482d
-> only proper / signed tickets in T:/ drive -> 100% safe way of telling a ticket is legit
243 lines
10 KiB
C
243 lines
10 KiB
C
#include "ticket.h"
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#include "support.h"
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#include "unittype.h"
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#include "aes.h"
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#include "sha.h"
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#include "rsa.h"
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#include "ff.h"
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u32 ValidateTicket(Ticket* ticket) {
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const u8 magic[] = { TICKET_SIG_TYPE };
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if ((memcmp(ticket->sig_type, magic, sizeof(magic)) != 0) ||
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((strncmp((char*) ticket->issuer, TICKET_ISSUER, 0x40) != 0) &&
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(strncmp((char*) ticket->issuer, TICKET_ISSUER_DEV, 0x40) != 0)) ||
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(ticket->commonkey_idx >= 6))
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return 1;
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return 0;
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}
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u32 ValidateTicketSignature(Ticket* ticket) {
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static bool got_modexp = false;
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static u8 mod[0x100] = { 0 };
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static u32 exp = 0;
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// grab cert from cert.db
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if (!got_modexp) {
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Certificate cert;
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FIL db;
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UINT bytes_read;
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if (f_open(&db, "1:/dbs/certs.db", FA_READ | FA_OPEN_EXISTING) != FR_OK)
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return 1;
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f_lseek(&db, 0x3F10);
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f_read(&db, &cert, CERT_SIZE, &bytes_read);
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f_close(&db);
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memcpy(mod, cert.mod, 0x100);
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exp = getle32(cert.exp);
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got_modexp = true;
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}
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if (!RSA_setKey2048(3, mod, exp) ||
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!RSA_verify2048((void*) &(ticket->signature), (void*) &(ticket->issuer), 0x210))
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return 1;
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return 0;
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}
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u32 CryptTitleKey(TitleKeyEntry* tik, bool encrypt, bool devkit) {
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// From https://github.com/profi200/Project_CTR/blob/master/makerom/pki/prod.h#L19
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static const u8 common_keyy[6][16] __attribute__((aligned(16))) = {
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{0xD0, 0x7B, 0x33, 0x7F, 0x9C, 0xA4, 0x38, 0x59, 0x32, 0xA2, 0xE2, 0x57, 0x23, 0x23, 0x2E, 0xB9} , // 0 - eShop Titles
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{0x0C, 0x76, 0x72, 0x30, 0xF0, 0x99, 0x8F, 0x1C, 0x46, 0x82, 0x82, 0x02, 0xFA, 0xAC, 0xBE, 0x4C} , // 1 - System Titles
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{0xC4, 0x75, 0xCB, 0x3A, 0xB8, 0xC7, 0x88, 0xBB, 0x57, 0x5E, 0x12, 0xA1, 0x09, 0x07, 0xB8, 0xA4} , // 2
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{0xE4, 0x86, 0xEE, 0xE3, 0xD0, 0xC0, 0x9C, 0x90, 0x2F, 0x66, 0x86, 0xD4, 0xC0, 0x6F, 0x64, 0x9F} , // 3
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{0xED, 0x31, 0xBA, 0x9C, 0x04, 0xB0, 0x67, 0x50, 0x6C, 0x44, 0x97, 0xA3, 0x5B, 0x78, 0x04, 0xFC} , // 4
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{0x5E, 0x66, 0x99, 0x8A, 0xB4, 0xE8, 0x93, 0x16, 0x06, 0x85, 0x0F, 0xD7, 0xA1, 0x6D, 0xD7, 0x55} , // 5
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};
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// From https://github.com/profi200/Project_CTR/blob/master/makerom/pki/dev.h#L21
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static const u8 common_key_dev[6][16] __attribute__((aligned(16))) = {
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{0x55, 0xA3, 0xF8, 0x72, 0xBD, 0xC8, 0x0C, 0x55, 0x5A, 0x65, 0x43, 0x81, 0x13, 0x9E, 0x15, 0x3B} , // 0 - eShop Titles
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{0x44, 0x34, 0xED, 0x14, 0x82, 0x0C, 0xA1, 0xEB, 0xAB, 0x82, 0xC1, 0x6E, 0x7B, 0xEF, 0x0C, 0x25} , // 1 - System Titles
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{0xF6, 0x2E, 0x3F, 0x95, 0x8E, 0x28, 0xA2, 0x1F, 0x28, 0x9E, 0xEC, 0x71, 0xA8, 0x66, 0x29, 0xDC} , // 2
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{0x2B, 0x49, 0xCB, 0x6F, 0x99, 0x98, 0xD9, 0xAD, 0x94, 0xF2, 0xED, 0xE7, 0xB5, 0xDA, 0x3E, 0x27} , // 3
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{0x75, 0x05, 0x52, 0xBF, 0xAA, 0x1C, 0x04, 0x07, 0x55, 0xC8, 0xD5, 0x9A, 0x55, 0xF9, 0xAD, 0x1F} , // 4
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{0xAA, 0xDA, 0x4C, 0xA8, 0xF6, 0xE5, 0xA9, 0x77, 0xE0, 0xA0, 0xF9, 0xE4, 0x76, 0xCF, 0x0D, 0x63} , // 5
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};
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u32 mode = (encrypt) ? AES_CNT_TITLEKEY_ENCRYPT_MODE : AES_CNT_TITLEKEY_DECRYPT_MODE;
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u8 ctr[16] = { 0 };
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// setup key 0x3D // ctr
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if (tik->commonkey_idx >= 6) return 1;
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if (!devkit) setup_aeskeyY(0x3D, (void*) common_keyy[tik->commonkey_idx]);
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else setup_aeskey(0x3D, (void*) common_key_dev[tik->commonkey_idx]);
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use_aeskey(0x3D);
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memcpy(ctr, tik->title_id, 8);
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set_ctr(ctr);
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// decrypt / encrypt the titlekey
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aes_decrypt(tik->titlekey, tik->titlekey, 1, mode);
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return 0;
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}
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u32 GetTitleKey(u8* titlekey, Ticket* ticket) {
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TitleKeyEntry tik = { 0 };
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memcpy(tik.title_id, ticket->title_id, 8);
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memcpy(tik.titlekey, ticket->titlekey, 16);
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tik.commonkey_idx = ticket->commonkey_idx;
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if (CryptTitleKey(&tik, false, TICKET_DEVKIT(ticket)) != 0) return 1;
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memcpy(titlekey, tik.titlekey, 16);
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return 0;
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}
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Ticket* TicketFromTickDbChunk(u8* chunk, u8* title_id, bool legit_pls) {
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// chunk must be aligned to 0x200 byte in file and at least 0x400 byte big
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Ticket* tick = (Ticket*) (chunk + 0x18);
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if ((getle32(chunk + 0x10) == 0) || (getle32(chunk + 0x14) != sizeof(Ticket))) return NULL;
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if (ValidateTicket(tick) != 0) return NULL; // ticket not validated
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if (title_id && (memcmp(title_id, tick->title_id, 8) != 0)) return NULL; // title id not matching
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if (legit_pls && (ValidateTicketSignature(tick) != 0)) return NULL; // legit check using RSA sig
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return tick;
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}
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u32 FindTicket(Ticket* ticket, u8* title_id, bool force_legit, bool emunand) {
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const char* path_db = TICKDB_PATH(emunand); // EmuNAND / SysNAND
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const u32 area_offsets[] = { TICKDB_AREA_OFFSETS };
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u8 data[0x400];
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FIL file;
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UINT btr;
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// parse file, sector by sector
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if (f_open(&file, path_db, FA_READ | FA_OPEN_EXISTING) != FR_OK)
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return 1;
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bool found = false;
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for (u32 p = 0; p < 2; p++) {
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u32 area_offset = area_offsets[p];
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for (u32 i = 0; !found && (i < TICKDB_AREA_SIZE); i += 0x200) {
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f_lseek(&file, area_offset + i);
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if ((f_read(&file, data, 0x400, &btr) != FR_OK) || (btr != 0x400)) break;
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Ticket* tick = TicketFromTickDbChunk(data, title_id, force_legit);
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if (!tick) continue;
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memcpy(ticket, tick, sizeof(Ticket));
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found = true;
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break;
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}
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}
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f_close(&file);
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return (found) ? 0 : 1;
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}
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u32 FindTitleKey(Ticket* ticket, u8* title_id) {
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bool found = false;
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// search for a titlekey inside encTitleKeys.bin / decTitleKeys.bin
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// when found, add it to the ticket
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for (u32 enc = 0; (enc <= 1) && !found; enc++) {
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TitleKeysInfo* tikdb = (TitleKeysInfo*) (TEMP_BUFFER + (TEMP_BUFFER_SIZE/2));
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u32 len = LoadSupportFile((enc) ? TIKDB_NAME_ENC : TIKDB_NAME_DEC, tikdb, (TEMP_BUFFER_SIZE/2));
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if (len == 0) continue; // file not found
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if (tikdb->n_entries > (len - 16) / 32)
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continue; // filesize / titlekey db size mismatch
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for (u32 t = 0; t < tikdb->n_entries; t++) {
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TitleKeyEntry* tik = tikdb->entries + t;
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if (memcmp(title_id, tik->title_id, 8) != 0)
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continue;
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if (!enc && (CryptTitleKey(tik, true, TICKET_DEVKIT(ticket)) != 0)) // encrypt the key first
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continue;
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memcpy(ticket->titlekey, tik->titlekey, 16);
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ticket->commonkey_idx = tik->commonkey_idx;
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found = true; // found, inserted
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break;
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}
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}
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return (found) ? 0 : 1;
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}
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u32 AddTitleKeyToInfo(TitleKeysInfo* tik_info, TitleKeyEntry* tik_entry, bool decrypted_in, bool decrypted_out, bool devkit) {
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if (!tik_entry) { // no titlekey entry -> reset database
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memset(tik_info, 0, 16);
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return 0;
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}
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// check if entry already in DB
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u32 n_entries = tik_info->n_entries;
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TitleKeyEntry* tik = tik_info->entries;
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for (u32 i = 0; i < n_entries; i++, tik++)
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if (memcmp(tik->title_id, tik_entry->title_id, 8) == 0) return 0;
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// actually a new titlekey
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memcpy(tik, tik_entry, sizeof(TitleKeyEntry));
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if ((decrypted_in != decrypted_out) && (CryptTitleKey(tik, !decrypted_out, devkit) != 0)) return 1;
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tik_info->n_entries++;
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return 0;
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}
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u32 AddTicketToInfo(TitleKeysInfo* tik_info, Ticket* ticket, bool decrypt) { // TODO: check for legit tickets?
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if (!ticket) return AddTitleKeyToInfo(tik_info, NULL, false, false, false);
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TitleKeyEntry tik = { 0 };
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memcpy(tik.title_id, ticket->title_id, 8);
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memcpy(tik.titlekey, ticket->titlekey, 16);
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tik.commonkey_idx = ticket->commonkey_idx;
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return AddTitleKeyToInfo(tik_info, &tik, false, decrypt, TICKET_DEVKIT(ticket));
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}
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u32 BuildFakeTicket(Ticket* ticket, u8* title_id) {
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const u8 sig_type[4] = { TICKET_SIG_TYPE }; // RSA_2048 SHA256
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const u8 ticket_cnt_index[] = { // whatever this is
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0x00, 0x01, 0x00, 0x14, 0x00, 0x00, 0x00, 0xAC, 0x00, 0x00, 0x00, 0x14, 0x00, 0x01, 0x00, 0x14,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x84,
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0x00, 0x00, 0x00, 0x84, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
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};
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// set ticket all zero for a clean start
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memset(ticket, 0x00, sizeof(Ticket));
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// fill ticket values
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memcpy(ticket->sig_type, sig_type, 4);
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memset(ticket->signature, 0xFF, 0x100);
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snprintf((char*) ticket->issuer, 0x40, IS_DEVKIT ? TICKET_ISSUER_DEV : TICKET_ISSUER);
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memset(ticket->ecdsa, 0xFF, 0x3C);
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ticket->version = 0x01;
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memset(ticket->titlekey, 0xFF, 16);
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memcpy(ticket->title_id, title_id, 8);
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ticket->commonkey_idx = 0x00; // eshop
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ticket->audit = 0x01; // whatever
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memcpy(ticket->content_index, ticket_cnt_index, sizeof(ticket_cnt_index));
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return 0;
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}
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u32 BuildTicketCert(u8* tickcert) {
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const u8 cert_hash_expected[0x20] = {
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0xDC, 0x15, 0x3C, 0x2B, 0x8A, 0x0A, 0xC8, 0x74, 0xA9, 0xDC, 0x78, 0x61, 0x0E, 0x6A, 0x8F, 0xE3,
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0xE6, 0xB1, 0x34, 0xD5, 0x52, 0x88, 0x73, 0xC9, 0x61, 0xFB, 0xC7, 0x95, 0xCB, 0x47, 0xE6, 0x97
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};
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const u8 cert_hash_expected_dev[0x20] = {
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0x97, 0x2A, 0x32, 0xFF, 0x9D, 0x4B, 0xAA, 0x2F, 0x1A, 0x24, 0xCF, 0x21, 0x13, 0x87, 0xF5, 0x38,
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0xC6, 0x4B, 0xD4, 0x8F, 0xDF, 0x13, 0x21, 0x3D, 0xFC, 0x72, 0xFC, 0x8D, 0x9F, 0xDD, 0x01, 0x0E
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};
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// open certs.db file on SysNAND
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FIL db;
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UINT bytes_read;
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if (f_open(&db, "1:/dbs/certs.db", FA_READ | FA_OPEN_EXISTING) != FR_OK)
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return 1;
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// grab ticket cert from 3 offsets
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f_lseek(&db, 0x3F10);
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f_read(&db, tickcert + 0x000, 0x300, &bytes_read);
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f_lseek(&db, 0x0C10);
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f_read(&db, tickcert + 0x300, 0x1F0, &bytes_read);
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f_lseek(&db, 0x3A00);
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f_read(&db, tickcert + 0x4F0, 0x210, &bytes_read);
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f_close(&db);
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// check the certificate hash
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u8 cert_hash[0x20];
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sha_quick(cert_hash, tickcert, TICKET_CDNCERT_SIZE, SHA256_MODE);
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if (memcmp(cert_hash, IS_DEVKIT ? cert_hash_expected_dev : cert_hash_expected, 0x20) != 0)
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return 1;
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return 0;
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}
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