Ticket.cpp

#include <cstring>
#include <cstdlib>
#include <exception>
#include <stdexcept>
#include <new>
#include <openssl/ssl.h>
#include <openssl/rsa.h>
#include <openssl/sha.h>
#include <openssl/bn.h>
#include <openssl/rand.h>
#include <openssl/evp.h>
#include "Ticket.hpp"
#include "Base64.hpp"

namespace
{
	class StaticPubRSAKey
	{
	private:
		static const u8 exp[3];

		RSA* key;

	public:
		StaticPubRSAKey(const u8* modulus, size_t length) noexcept
		{
			key = RSA_new();

			BIGNUM* foo = BN_bin2bn(modulus, length, NULL);
			BIGNUM* bar = BN_bin2bn(exp, sizeof(exp), NULL);

			if (!key || !foo || !bar)
			{
				printf("Constructor failed to initializing key\n");
				BN_clear_free(foo);
				BN_clear_free(bar);
				exit(1);
			}

			if (!RSA_set0_key(key, foo, bar, NULL))
			{
				printf("Constructor failed to set key\n");
				BN_clear_free(foo);
				BN_clear_free(bar);
				exit(1);
			}
		}

		~StaticPubRSAKey() noexcept { RSA_free(key); }

		inline bool RawEncrypt(void* data, void* encdata) noexcept
		{
			return (bool)RSA_public_encrypt(256, (u8 *)data, (u8 *)encdata, key, RSA_NO_PADDING);
		}

		inline bool VerifySHA256(const u8* digest, const u8* signature) noexcept
		{
			return (bool)RSA_verify(NID_sha256, digest, SHA256_DIGEST_LENGTH, signature, RSA_size(key), key);
		}
	};

	const u8 StaticPubRSAKey::exp[3] = { 0x01, 0x00, 0x01 };

	static const u8 cdn_modulus[256] =
	{
		0xD2, 0x4C, 0xB2, 0xE4, 0x8F, 0xEA, 0xF0, 0x04, 0xD4, 0xBB, 0x08, 0xF8, 0xF3, 0xDE, 0xFC, 0xBB,
		0x0C, 0x93, 0x4A, 0x14, 0x6B, 0x15, 0x36, 0x6C, 0x9D, 0xDC, 0x1E, 0xB1, 0x64, 0x9B, 0x9F, 0xEB,
		0x96, 0x4B, 0x56, 0x9C, 0x22, 0x83, 0x95, 0x4D, 0x3D, 0x2B, 0x8A, 0x1A, 0xB2, 0x1D, 0xC1, 0x15,
		0x9C, 0x2E, 0x6C, 0xB4, 0xCD, 0xD4, 0xC0, 0xBB, 0x96, 0xDB, 0xAD, 0x4F, 0x02, 0xD3, 0x1F, 0x45,
		0x57, 0x38, 0x92, 0xAF, 0x85, 0x52, 0x73, 0xAC, 0xA2, 0x0C, 0x45, 0x9B, 0x9B, 0xD3, 0x12, 0x64,
		0x25, 0xC0, 0x5D, 0x76, 0x6B, 0xFD, 0x2F, 0xAD, 0x87, 0x98, 0x6C, 0x08, 0x41, 0x6A, 0xEA, 0x8D,
		0x42, 0x66, 0xCD, 0x9D, 0x4F, 0xFC, 0x3F, 0x20, 0xF7, 0xB5, 0x67, 0x2B, 0x68, 0x67, 0x93, 0x14,
		0x1E, 0xDD, 0xE1, 0xB1, 0x16, 0x89, 0xAC, 0xA2, 0xF6, 0x46, 0x9C, 0x9B, 0x0E, 0xA4, 0x57, 0x71,
		0x50, 0x23, 0x51, 0x85, 0xED, 0x4E, 0x7E, 0x4F, 0x2F, 0x90, 0x36, 0xC1, 0x65, 0xA2, 0x0C, 0x73,
		0xE1, 0x60, 0xC6, 0x44, 0xA4, 0x73, 0x03, 0xD2, 0xED, 0x9B, 0xB0, 0xBA, 0x2F, 0xC9, 0x09, 0x89,
		0xBD, 0x87, 0xEB, 0x45, 0x63, 0xD8, 0xF7, 0xA6, 0x1D, 0x88, 0x9A, 0x78, 0x07, 0xB1, 0x55, 0xE7,
		0xF2, 0x10, 0x7D, 0x04, 0x8D, 0x82, 0x8F, 0xCB, 0xA2, 0x30, 0x90, 0x83, 0x93, 0x41, 0x38, 0x56,
		0x14, 0xFD, 0xE4, 0xFA, 0xBE, 0x84, 0xF2, 0xF0, 0x53, 0x2D, 0xA3, 0x47, 0x50, 0xF3, 0x2A, 0xB1,
		0x1F, 0xBE, 0x08, 0x4C, 0x00, 0x83, 0xED, 0xBF, 0x0B, 0x50, 0xE9, 0x6A, 0x49, 0xDD, 0x9D, 0x1E,
		0x29, 0x3E, 0x22, 0x49, 0xEE, 0x95, 0x4D, 0xB8, 0xAF, 0xD1, 0x39, 0x46, 0x1E, 0xAD, 0x4F, 0x11,
		0xA2, 0xD0, 0x68, 0x36, 0x44, 0x64, 0x73, 0x14, 0x0E, 0xD3, 0x86, 0x7E, 0x4E, 0x5E, 0xAD, 0x3B
	};

	static const u8 XS0000000c_modulus[256] =
	{
		0xAD, 0x50, 0x5B, 0xB6, 0xC6, 0x7E, 0x2E, 0x5B, 0xDD, 0x6A, 0x3B, 0xEC, 0x43, 0xD9, 0x10, 0xC7,
		0x72, 0xE9, 0xCC, 0x29, 0x0D, 0xA5, 0x85, 0x88, 0xB7, 0x7D, 0xCC, 0x11, 0x68, 0x0B, 0xB3, 0xE2,
		0x9F, 0x4E, 0xAB, 0xBB, 0x26, 0xE9, 0x8C, 0x26, 0x01, 0x98, 0x5C, 0x04, 0x1B, 0xB1, 0x43, 0x78,
		0xE6, 0x89, 0x18, 0x1A, 0xAD, 0x77, 0x05, 0x68, 0xE9, 0x28, 0xA2, 0xB9, 0x81, 0x67, 0xEE, 0x3E,
		0x10, 0xD0, 0x72, 0xBE, 0xEF, 0x1F, 0xA2, 0x2F, 0xA2, 0xAA, 0x3E, 0x13, 0xF1, 0x1E, 0x18, 0x36,
		0xA9, 0x2A, 0x42, 0x81, 0xEF, 0x70, 0xAA, 0xF4, 0xE4, 0x62, 0x99, 0x82, 0x21, 0xC6, 0xFB, 0xB9,
		0xBD, 0xD0, 0x17, 0xE6, 0xAC, 0x59, 0x04, 0x94, 0xE9, 0xCE, 0xA9, 0x85, 0x9C, 0xEB, 0x2D, 0x2A,
		0x4C, 0x17, 0x66, 0xF2, 0xC3, 0x39, 0x12, 0xC5, 0x8F, 0x14, 0xA8, 0x03, 0xE3, 0x6F, 0xCC, 0xDC,
		0xCC, 0xDC, 0x13, 0xFD, 0x7A, 0xE7, 0x7C, 0x7A, 0x78, 0xD9, 0x97, 0xE6, 0xAC, 0xC3, 0x55, 0x57,
		0xE0, 0xD3, 0xE9, 0xEB, 0x64, 0xB4, 0x3C, 0x92, 0xF4, 0xC5, 0x0D, 0x67, 0xA6, 0x02, 0xDE, 0xB3,
		0x91, 0xB0, 0x66, 0x61, 0xCD, 0x32, 0x88, 0x0B, 0xD6, 0x49, 0x12, 0xAF, 0x1C, 0xBC, 0xB7, 0x16,
		0x2A, 0x06, 0xF0, 0x25, 0x65, 0xD3, 0xB0, 0xEC, 0xE4, 0xFC, 0xEC, 0xDD, 0xAE, 0x8A, 0x49, 0x34,
		0xDB, 0x8E, 0xE6, 0x7F, 0x30, 0x17, 0x98, 0x62, 0x21, 0x15, 0x5D, 0x13, 0x1C, 0x6C, 0x3F, 0x09,
		0xAB, 0x19, 0x45, 0xC2, 0x06, 0xAC, 0x70, 0xC9, 0x42, 0xB3, 0x6F, 0x49, 0xA1, 0x18, 0x3B, 0xCD,
		0x78, 0xB6, 0xE4, 0xB4, 0x7C, 0x6C, 0x5C, 0xAC, 0x0F, 0x8D, 0x62, 0xF8, 0x97, 0xC6, 0x95, 0x3D,
		0xD1, 0x2F, 0x28, 0xB7, 0x0C, 0x5B, 0x7D, 0xF7, 0x51, 0x81, 0x9A, 0x98, 0x34, 0x65, 0x26, 0x25
	};

	static StaticPubRSAKey cdnkey(cdn_modulus, sizeof(cdn_modulus));
	static StaticPubRSAKey XS0000000c(XS0000000c_modulus, sizeof(XS0000000c_modulus));

	static bool KeyEncrypt(u8* out, const u8* key, const u8* iv) noexcept
	{
		struct raw_keyiv_decrypted_buffer
		{
			u8 foo[2]; // = {0x00, 0x01}
			u8 bar[221]; // all 0xFF
			u8 foobar; // 0x00
			u8 key[16]; // random
			u8 iv[16]; // random
		} keydata;

		keydata.foo[0] = keydata.foobar = 0;
		keydata.foo[1] = 1;

		memset(keydata.bar, 0xFF, sizeof(keydata.bar));

		memcpy(keydata.key, key, 16);
		memcpy(keydata.iv, iv, 16);

		return cdnkey.RawEncrypt(&keydata, out);
	}

	static bool TicketEncrypt(const u8* data, size_t length, u8* out, const u8* key, const u8* iv) noexcept
	{
		EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
		
		if (!ctx) return false;
		bool ret = false;

		do
		{
			if (!EVP_CipherInit_ex(ctx, EVP_aes_128_cbc(), NULL, key, iv, 1) || 
				 EVP_CIPHER_CTX_key_length(ctx) != 16 || 
				 EVP_CIPHER_CTX_iv_length(ctx) != 16)
				break;

			EVP_CIPHER_CTX_set_padding(ctx, 0);

			int foo;

			if (!EVP_CipherUpdate(ctx, out, &foo, data, length) &&
				!EVP_CipherFinal_ex(ctx, out + foo, &foo))
				break;
				
			ret = true;
		} while(0);

		EVP_CIPHER_CTX_free(ctx);
		
		return ret;
	}
}

void NintendoData::Ticket::GetWrappedTicket(char*& out_b64_encticket, char*& out_b64_encticketkey) const
{
	u8 key[16] = { 0 };
	u8 iv[16] = { 0 };

	size_t ticketlen = ((uptr)header - (uptr)rawticket) + sizeof(struct Header);

	u8 *encticket = (u8 *)calloc(ticketlen,1);
	u8 *enckeyiv = (u8 *)calloc(256,1);

	out_b64_encticket = NULL;
	out_b64_encticketkey = NULL;

	try
	{
		if (!encticket || !enckeyiv)
			throw std::bad_alloc();

		RAND_bytes(key, 16);
		RAND_bytes(iv, 16);

		if (!TicketEncrypt(rawticket, ticketlen, encticket, key, iv))
			throw std::runtime_error("Error on encryption of ticket");

		if (!KeyEncrypt(enckeyiv, key, iv))
			throw std::runtime_error("Error on encryption of key and iv");

		Base64::Encode(encticket, ticketlen, out_b64_encticket);
		Base64::Encode(enckeyiv, 256, out_b64_encticketkey);
	}
	catch (...)
	{ //ensure clean up ...
		free(encticket);
		free(enckeyiv);

		free(out_b64_encticket);
		free(out_b64_encticketkey);

		out_b64_encticket = NULL;
		out_b64_encticketkey = NULL;
		throw; //rethrow
	}

	free(encticket);
	free(enckeyiv);
}

bool NintendoData::Ticket::VerifySign() const
{
	if ((enum SignatureType)Endian::Be((const u32 *)rawticket) != RSA_2048_SHA256)
		throw std::runtime_error("Currently lacking support for other signature types for now.");

	if (memcmp(header->Issuer, "Root-CA00000003-XS0000000c", sizeof("Root-CA00000003-XS0000000c") - 1) != 0)
		throw std::runtime_error("Currently lacking support for other signature issues other than Root-CA00000003-XS0000000c");

	u8 digest[SHA256_DIGEST_LENGTH];
	
	SHA256((u8 *)header, sizeof(Header), digest);

	return XS0000000c.VerifySHA256(digest, &rawticket[4]);
}

NintendoData::Ticket::Ticket(const void* ptr, size_t ptrlen, bool mustbesigned)
{
	if (!ptr || ptrlen < 4)
		throw std::invalid_argument("Invalid pointer.");

	size_t minexpectedlen = sizeof(struct Header);
	size_t headeroffset;

	switch((enum SignatureType)Endian::Be((const u32 *)ptr))
	{
		case RSA_4096_SHA1:
		case RSA_4096_SHA256:
			minexpectedlen += 0x240u;
			headeroffset = 0x240u;
			break;
		case RSA_2048_SHA1:
		case RSA_2048_SHA256:
			minexpectedlen += 0x140u;
			headeroffset = 0x140u;
			break;
		case ECDSA_SHA1:
		case ECDSA_SHA256:
			minexpectedlen += 0x80u;
			headeroffset = 0x80u;
			break;
		default:
			throw std::invalid_argument("Invalid Signature Type");
	}

	if (minexpectedlen > ptrlen)
		throw std::invalid_argument("Ticket too small");

	if (!(rawticket = (u8 *)malloc(minexpectedlen)))
		throw std::runtime_error("Can't allocate memory for Ticket.");

	memcpy(rawticket, ptr, minexpectedlen);

	header = (struct Header *)&rawticket[headeroffset];

	try
	{
		if (mustbesigned ? !VerifySign() : false)
			throw std::invalid_argument("Ticket is not properly signed.");
	}
	catch (...)
	{
		free(rawticket);
		throw;
	}
}

NintendoData::Ticket::~Ticket() noexcept
{
	free(rawticket);
}