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nse_openssl.cc
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nse_openssl.cc
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/* OpenSSL library for lua
* adapted from lmd5 library (http://www.tecgraf.puc-rio.br/~lhf/ftp/lua/)
* Original code written by Luiz Henrique de Figueiredo <[email protected]>
* Adapted for NMap by Thomas Buchanan <[email protected]>
* bignum and rand_bytes functions added by Sven Klemm <[email protected]>
*/
#include <openssl/bn.h>
#include <openssl/crypto.h>
#include <openssl/des.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <openssl/md4.h>
#include <openssl/md5.h>
#include <openssl/rand.h>
#include <openssl/rc4.h>
#include <openssl/ripemd.h>
#include <openssl/sha.h>
extern "C" {
#include "lua.h"
#include "lauxlib.h"
}
#include "nse_openssl.h"
typedef struct bignum_data {
BIGNUM * bn;
} bignum_data_t;
static int l_bignum_bin2bn( lua_State *L ) /** bignum_bin2bn( string s ) */
{
size_t len;
const unsigned char * s = (unsigned char *) luaL_checklstring( L, 1, &len );
BIGNUM * num = BN_new();
BN_bin2bn( s, len, num );
bignum_data_t * data = (bignum_data_t *) lua_newuserdata( L, sizeof(bignum_data_t));
luaL_getmetatable( L, "BIGNUM" );
lua_setmetatable( L, -2 );
data->bn = num;
return 1;
}
static int l_bignum_dec2bn( lua_State *L ) /** bignum_dec2bn( string s ) */
{
const char * s = luaL_checkstring( L, 1 );
BIGNUM * num = BN_new();
BN_dec2bn( &num, s );
bignum_data_t * data = (bignum_data_t *) lua_newuserdata( L, sizeof(bignum_data_t));
luaL_getmetatable( L, "BIGNUM" );
lua_setmetatable( L, -2 );
data->bn = num;
return 1;
}
static int l_bignum_hex2bn( lua_State *L ) /** bignum_hex2bn( string s ) */
{
const char * s = luaL_checkstring( L, 1 );
BIGNUM * num = BN_new();
BN_hex2bn( &num, s );
bignum_data_t * data = (bignum_data_t *) lua_newuserdata( L, sizeof(bignum_data_t));
luaL_getmetatable( L, "BIGNUM" );
lua_setmetatable( L, -2 );
data->bn = num;
return 1;
}
static int l_bignum_rand( lua_State *L ) /** bignum_rand( number bits ) */
{
size_t bits = luaL_checkint( L, 1 );
BIGNUM * num = BN_new();
BN_rand( num, bits, -1, 0 );
bignum_data_t * data = (bignum_data_t *) lua_newuserdata( L, sizeof(bignum_data_t));
luaL_getmetatable( L, "BIGNUM" );
lua_setmetatable( L, -2 );
data->bn = num;
return 1;
}
static int l_bignum_pseudo_rand( lua_State *L ) /** bignum_pseudo_rand( number bits ) */
{
size_t bits = luaL_checkint( L, 1 );
BIGNUM * num = BN_new();
BN_pseudo_rand( num, bits, -1, 0 );
bignum_data_t * data = (bignum_data_t *) lua_newuserdata( L, sizeof(bignum_data_t));
luaL_getmetatable( L, "BIGNUM" );
lua_setmetatable( L, -2 );
data->bn = num;
return 1;
}
static int l_bignum_mod_exp( lua_State *L ) /** bignum_mod_exp( BIGNUM a, BIGNUM p, BIGNUM m ) */
{
bignum_data_t * a = (bignum_data_t *) luaL_checkudata(L, 1, "BIGNUM");
bignum_data_t * p = (bignum_data_t *) luaL_checkudata(L, 2, "BIGNUM");
bignum_data_t * m = (bignum_data_t *) luaL_checkudata(L, 3, "BIGNUM");
BIGNUM * result = BN_new();
BN_CTX * ctx = BN_CTX_new();
BN_CTX_init( ctx );
BN_mod_exp( result, a->bn, p->bn, m->bn, ctx );
BN_CTX_free( ctx );
bignum_data_t * data = (bignum_data_t *) lua_newuserdata( L, sizeof(bignum_data_t));
luaL_getmetatable( L, "BIGNUM" );
lua_setmetatable( L, -2 );
data->bn = result;
return 1;
}
static int l_bignum_add( lua_State *L ) /** bignum_add( BIGNUM a, BIGNUM b ) */
{
bignum_data_t * a = (bignum_data_t *) luaL_checkudata(L, 1, "BIGNUM");
bignum_data_t * b = (bignum_data_t *) luaL_checkudata(L, 2, "BIGNUM");
BIGNUM * result = BN_new();
BN_add( result, a->bn, b->bn );
bignum_data_t * data = (bignum_data_t *) lua_newuserdata( L, sizeof(bignum_data_t));
luaL_getmetatable( L, "BIGNUM" );
lua_setmetatable( L, -2 );
data->bn = result;
return 1;
}
static int l_bignum_num_bits( lua_State *L ) /** bignum_num_bits( BIGNUM bn ) */
{
bignum_data_t * userdata = (bignum_data_t *) luaL_checkudata(L, 1, "BIGNUM");
lua_pushnumber( L, BN_num_bits( userdata->bn) );
return 1;
}
static int l_bignum_num_bytes( lua_State *L ) /** bignum_num_bytes( BIGNUM bn ) */
{
bignum_data_t * userdata = (bignum_data_t *) luaL_checkudata(L, 1, "BIGNUM");
lua_pushnumber( L, BN_num_bytes( userdata->bn) );
return 1;
}
static int l_bignum_set_bit( lua_State *L ) /** bignum_set_bit( BIGNUM bn, number position ) */
{
bignum_data_t * userdata = (bignum_data_t *) luaL_checkudata(L, 1, "BIGNUM");
int position = luaL_checkint( L, 2 );
BN_set_bit( userdata->bn, position );
return 0;
}
static int l_bignum_clear_bit( lua_State *L ) /** bignum_clear_bit( BIGNUM bn, number position ) */
{
bignum_data_t * userdata = (bignum_data_t *) luaL_checkudata(L, 1, "BIGNUM");
int position = luaL_checkint( L, 2 );
BN_clear_bit( userdata->bn, position );
return 0;
}
static int l_bignum_is_bit_set( lua_State *L ) /** bignum_set_bit( BIGNUM bn, number position ) */
{
bignum_data_t * userdata = (bignum_data_t *) luaL_checkudata(L, 1, "BIGNUM");
int position = luaL_checkint( L, 2 );
lua_pushboolean( L, BN_is_bit_set( userdata->bn, position ) );
return 1;
}
static int l_bignum_bn2bin( lua_State *L ) /** bignum_bn2bin( BIGNUM bn ) */
{
bignum_data_t * userdata = (bignum_data_t *) luaL_checkudata(L, 1, "BIGNUM");
unsigned char * result = (unsigned char *) malloc( BN_num_bytes( userdata->bn ) );
if (!result) return luaL_error( L, "Couldn't allocate memory.");
int len = BN_bn2bin( userdata->bn, result );
lua_pushlstring( L, (char *) result, len );
free( result );
return 1;
}
static int l_bignum_bn2dec( lua_State *L ) /** bignum_bn2dec( BIGNUM bn ) */
{
bignum_data_t * userdata = (bignum_data_t *) luaL_checkudata(L, 1, "BIGNUM");
char * result = BN_bn2dec( userdata->bn );
lua_pushstring( L, result );
OPENSSL_free( result );
return 1;
}
static int l_bignum_bn2hex( lua_State *L ) /** bignum_bn2hex( BIGNUM bn ) */
{
bignum_data_t * userdata = (bignum_data_t *) luaL_checkudata(L, 1, "BIGNUM");
char * result = BN_bn2hex( userdata->bn );
lua_pushstring( L, result );
OPENSSL_free( result );
return 1;
}
static int l_bignum_free( lua_State *L ) /** bignum_free( bignum ) */
{
bignum_data_t * userdata = (bignum_data_t *) luaL_checkudata(L, 1, "BIGNUM");
BN_clear_free( userdata->bn );
return 0;
}
static int l_rand_bytes( lua_State *L ) /** rand_bytes( number bytes ) */
{
size_t len = luaL_checkint( L, 1 );
unsigned char * result = (unsigned char *) malloc( len );
if (!result) return luaL_error( L, "Couldn't allocate memory.");
RAND_bytes( result, len );
lua_pushlstring( L, (char *) result, len );
free( result );
return 1;
}
static int l_rand_pseudo_bytes( lua_State *L ) /** rand_pseudo_bytes( number bytes ) */
{
size_t len = luaL_checkint( L, 1 );
unsigned char * result = (unsigned char *) malloc( len );
if (!result) return luaL_error( L, "Couldn't allocate memory.");
RAND_pseudo_bytes( result, len );
lua_pushlstring( L, (char *) result, len );
free( result );
return 1;
}
static int l_md4(lua_State *L) /** md4(string s) */
{
size_t len;
const unsigned char *s = (unsigned char *) luaL_checklstring( L, 1, &len );
unsigned char digest[16];
lua_pushlstring( L, (char *) MD4( s, len, digest ), 16 );
return 1;
}
static int l_md5(lua_State *L) /** md5(string s) */
{
size_t len;
const unsigned char *s = (unsigned char *) luaL_checklstring( L, 1, &len );
unsigned char digest[16];
lua_pushlstring( L, (char *) MD5( s, len, digest ), 16 );
return 1;
}
static int l_sha1(lua_State *L) /** sha1(string s) */
{
size_t len;
const unsigned char *s = (unsigned char *) luaL_checklstring( L, 1, &len );
unsigned char digest[20];
lua_pushlstring( L, (char *) SHA1( s, len, digest ), 20 );
return 1;
}
static int l_ripemd160(lua_State *L) /** ripemd160(string s) */
{
size_t len;
const unsigned char *s = (unsigned char *) luaL_checklstring( L, 1, &len );
unsigned char digest[20];
lua_pushlstring( L, (char *) RIPEMD160( s, len, digest ), 20 );
return 1;
}
static int l_digest(lua_State *L) /** digest(string algorithm, string message) */
{
size_t msg_len;
unsigned int digest_len;
const char *algorithm = luaL_checkstring( L, 1 );
const unsigned char *msg = (unsigned char *) luaL_checklstring( L, 2, &msg_len );
unsigned char digest[EVP_MAX_MD_SIZE];
const EVP_MD * evp_md;
EVP_MD_CTX mdctx;
evp_md = EVP_get_digestbyname( algorithm );
if (!evp_md) return luaL_error( L, "Unknown digest algorithm: %s", algorithm );
EVP_MD_CTX_init(&mdctx);
if (!(
EVP_DigestInit_ex( &mdctx, evp_md, NULL ) &&
EVP_DigestUpdate( &mdctx, msg, msg_len ) &&
EVP_DigestFinal_ex( &mdctx, digest, &digest_len ))) {
EVP_MD_CTX_cleanup( &mdctx );
unsigned long e = ERR_get_error();
return luaL_error( L, "OpenSSL error %d in %s: function %s: %s", e, ERR_lib_error_string(e),
ERR_func_error_string(e), ERR_reason_error_string(e));
}
EVP_MD_CTX_cleanup( &mdctx );
lua_pushlstring( L, (char *) digest, digest_len );
return 1;
}
static int l_hmac(lua_State *L) /** hmac(string algorithm, string key, string message) */
{
size_t key_len, msg_len;
unsigned int digest_len;
const char *algorithm = luaL_checkstring( L, 1 );
const unsigned char *key = (unsigned char *) luaL_checklstring( L, 2, &key_len );
const unsigned char *msg = (unsigned char *) luaL_checklstring( L, 3, &msg_len );
unsigned char digest[EVP_MAX_MD_SIZE];
const EVP_MD * evp_md;
evp_md = EVP_get_digestbyname( algorithm );
if (!evp_md) return luaL_error( L, "Unknown digest algorithm: %s", algorithm );
HMAC( evp_md, key, key_len, msg, msg_len, digest, &digest_len );
lua_pushlstring( L, (char *) digest, digest_len );
return 1;
}
struct enumerator_data {
lua_State * L;
int index;
};
static void enumerate_algorithms( const OBJ_NAME * name, void * arg )
{
struct enumerator_data* data = (struct enumerator_data *) arg;
lua_pushstring( data->L, name->name );
lua_rawseti( data->L, -2, data->index );
data->index++;
}
static int l_supported_digests(lua_State *L) /** supported_digests() */
{
enumerator_data data;
data.L = L;
data.index = 1;
lua_newtable( L );
OBJ_NAME_do_all_sorted( OBJ_NAME_TYPE_MD_METH,enumerate_algorithms, &data );
return 1;
}
static int l_supported_ciphers(lua_State *L) /** supported_ciphers() */
{
enumerator_data data;
data.L = L;
data.index = 1;
lua_newtable( L );
OBJ_NAME_do_all_sorted( OBJ_NAME_TYPE_CIPHER_METH,enumerate_algorithms, &data );
return 1;
}
static int l_encrypt(lua_State *L) /** encrypt( string algorithm, string key, string iv, string data, bool padding = false ) */
{
const char *algorithm = luaL_checkstring( L, 1 );
const EVP_CIPHER * evp_cipher = EVP_get_cipherbyname( algorithm );
if (!evp_cipher) return luaL_error( L, "Unknown cipher algorithm: %s", algorithm );
size_t key_len, iv_len, data_len;
const unsigned char *key = (unsigned char *) luaL_checklstring( L, 2, &key_len );
const unsigned char *iv = (unsigned char *) luaL_optlstring( L, 3, "", &iv_len );
const unsigned char *data = (unsigned char *) luaL_checklstring( L, 4, &data_len );
int padding = lua_toboolean( L, 5 );
if (iv[0] == '\0')
iv = NULL;
EVP_CIPHER_CTX cipher_ctx;
EVP_CIPHER_CTX_init( &cipher_ctx );
/* First create the cipher context, then set the key length and padding, and
check the iv length. Below we set the key and iv. */
if (!(
EVP_EncryptInit_ex( &cipher_ctx, evp_cipher, NULL, NULL, NULL ) &&
EVP_CIPHER_CTX_set_key_length( &cipher_ctx, key_len ) &&
EVP_CIPHER_CTX_set_padding( &cipher_ctx, padding ))) {
unsigned long e = ERR_get_error();
return luaL_error( L, "OpenSSL error %d in %s: function %s: %s", e, ERR_lib_error_string(e),
ERR_func_error_string(e), ERR_reason_error_string(e));
}
if (iv != NULL && (int) iv_len != EVP_CIPHER_CTX_iv_length( &cipher_ctx )) {
return luaL_error( L, "Length of iv is %d; should be %d",
(int) iv_len, EVP_CIPHER_CTX_iv_length( &cipher_ctx ));
}
int out_len, final_len;
unsigned char * out = (unsigned char *) malloc( data_len + EVP_MAX_BLOCK_LENGTH );
if (!out) return luaL_error( L, "Couldn't allocate memory.");
if (!(
EVP_EncryptInit_ex( &cipher_ctx, NULL, NULL, key, iv ) &&
EVP_EncryptUpdate( &cipher_ctx, out, &out_len, data, data_len ) &&
EVP_EncryptFinal_ex( &cipher_ctx, out + out_len, &final_len ) )) {
EVP_CIPHER_CTX_cleanup( &cipher_ctx );
free( out );
unsigned long e = ERR_get_error();
return luaL_error( L, "OpenSSL error %d in %s: function %s: %s", e, ERR_lib_error_string(e),
ERR_func_error_string(e), ERR_reason_error_string(e));
}
lua_pushlstring( L, (char *) out, out_len + final_len );
EVP_CIPHER_CTX_cleanup( &cipher_ctx );
free( out );
return 1;
}
static int l_decrypt(lua_State *L) /** decrypt( string algorithm, string key, string iv, string data, bool padding = false ) */
{
const char *algorithm = luaL_checkstring( L, 1 );
const EVP_CIPHER * evp_cipher = EVP_get_cipherbyname( algorithm );
if (!evp_cipher) return luaL_error( L, "Unknown cipher algorithm: %s", algorithm );
size_t key_len, iv_len, data_len;
const unsigned char *key = (unsigned char *) luaL_checklstring( L, 2, &key_len );
const unsigned char *iv = (unsigned char *) luaL_optlstring( L, 3, "", &iv_len );
const unsigned char *data = (unsigned char *) luaL_checklstring( L, 4, &data_len );
int padding = lua_toboolean( L, 5 );
if (iv[0] == '\0')
iv = NULL;
EVP_CIPHER_CTX cipher_ctx;
EVP_CIPHER_CTX_init( &cipher_ctx );
if (!(
EVP_DecryptInit_ex( &cipher_ctx, evp_cipher, NULL, NULL, NULL ) &&
EVP_CIPHER_CTX_set_key_length( &cipher_ctx, key_len ) &&
EVP_CIPHER_CTX_set_padding( &cipher_ctx, padding ))) {
unsigned long e = ERR_get_error();
return luaL_error( L, "OpenSSL error %d in %s: function %s: %s", e, ERR_lib_error_string(e),
ERR_func_error_string(e), ERR_reason_error_string(e));
}
if (iv != NULL && (int) iv_len != EVP_CIPHER_CTX_iv_length( &cipher_ctx )) {
return luaL_error( L, "Length of iv is %d; should be %d",
(int) iv_len, EVP_CIPHER_CTX_iv_length( &cipher_ctx ));
}
int out_len, final_len;
unsigned char * out = (unsigned char *) malloc( data_len );
if (!out) return luaL_error( L, "Couldn't allocate memory.");
if (!(
EVP_DecryptInit_ex( &cipher_ctx, NULL, NULL, key, iv ) &&
EVP_DecryptUpdate( &cipher_ctx, out, &out_len, data, data_len ) &&
EVP_DecryptFinal_ex( &cipher_ctx, out + out_len, &final_len ) )) {
EVP_CIPHER_CTX_cleanup( &cipher_ctx );
free( out );
unsigned long e = ERR_get_error();
return luaL_error( L, "OpenSSL error %d in %s: function %s: %s", e, ERR_lib_error_string(e),
ERR_func_error_string(e), ERR_reason_error_string(e));
}
lua_pushlstring( L, (char *) out, out_len + final_len );
EVP_CIPHER_CTX_cleanup( &cipher_ctx );
free( out );
return 1;
}
static int l_DES_string_to_key(lua_State *L) /** DES_string_to_key( string data ) */
{
size_t len;
const unsigned char *data = (unsigned char *) luaL_checklstring( L, 1, &len );
if ( len != 7 )
return luaL_error( L, "String must have length of 7 bytes." );
DES_cblock key;
key[0] = data[0];
for( int i = 1; i < 8; i++ )
key[i] = data[i-1] << (8-i) | data[i] >> i;
DES_set_odd_parity( &key );
lua_pushlstring( L, (char *) key, 8 );
return 1;
}
static int l_rc4_options (lua_State *L)
{
lua_pushstring(L, RC4_options());
return 1;
}
static int l_rc4_encrypt (lua_State *L)
{
RC4_KEY *key = (RC4_KEY *) lua_touserdata(L, lua_upvalueindex(1));
size_t len;
const char *indata = luaL_checklstring(L, 1, &len);
unsigned char *outdata = (unsigned char *) lua_newuserdata(L, sizeof(unsigned char)*len);
RC4(key, len, (const unsigned char *)indata, outdata);
lua_pushlstring(L, (const char *)outdata, len);
return 1;
}
static int l_rc4 (lua_State *L)
{
size_t len;
const char *data = luaL_checklstring(L, 1, &len);
lua_newuserdata(L, sizeof(RC4_KEY));
RC4_set_key((RC4_KEY *)lua_touserdata(L, -1), (int)len, (const unsigned char *)data);
lua_pushcclosure(L, l_rc4_encrypt, 1);
return 1;
}
static const struct luaL_Reg bignum_methods[] = {
{ "num_bits", l_bignum_num_bits },
{ "num_bytes", l_bignum_num_bytes },
{ "tobin", l_bignum_bn2bin },
{ "todec", l_bignum_bn2dec },
{ "tohex", l_bignum_bn2hex },
{ "is_bit_set", l_bignum_is_bit_set },
{ "set_bit", l_bignum_set_bit },
{ "clear_bit", l_bignum_clear_bit },
{ "is_bit_set", l_bignum_is_bit_set },
{ "__gc", l_bignum_free },
{ NULL, NULL }
};
static const struct luaL_Reg openssllib[] = {
{ "bignum_num_bits", l_bignum_num_bits },
{ "bignum_num_bytes", l_bignum_num_bytes },
{ "bignum_set_bit", l_bignum_set_bit },
{ "bignum_clear_bit", l_bignum_clear_bit },
{ "bignum_is_bit_set", l_bignum_is_bit_set },
{ "bignum_bin2bn", l_bignum_bin2bn },
{ "bignum_dec2bn", l_bignum_dec2bn },
{ "bignum_hex2bn", l_bignum_hex2bn },
{ "bignum_rand", l_bignum_rand },
{ "bignum_pseudo_rand", l_bignum_pseudo_rand },
{ "bignum_bn2bin", l_bignum_bn2bin },
{ "bignum_bn2dec", l_bignum_bn2dec },
{ "bignum_bn2hex", l_bignum_bn2hex },
{ "bignum_add", l_bignum_add },
{ "bignum_mod_exp", l_bignum_mod_exp },
{ "rand_bytes", l_rand_bytes },
{ "rand_pseudo_bytes", l_rand_pseudo_bytes },
{ "md4", l_md4 },
{ "md5", l_md5 },
{ "sha1", l_sha1 },
{ "ripemd160", l_ripemd160 },
{ "digest", l_digest },
{ "hmac", l_hmac },
{ "encrypt", l_encrypt },
{ "decrypt", l_decrypt },
{ "DES_string_to_key", l_DES_string_to_key },
{ "supported_digests", l_supported_digests },
{ "supported_ciphers", l_supported_ciphers },
{ "rc4_options", l_rc4_options },
{ "rc4", l_rc4 },
{ NULL, NULL }
};
LUALIB_API int luaopen_openssl(lua_State *L) {
OpenSSL_add_all_algorithms();
ERR_load_crypto_strings();
luaL_newlib(L, openssllib);
// create metatable for bignum
luaL_newmetatable( L, "BIGNUM" );
// metatable.__index = metatable
lua_pushvalue( L, -1 );
lua_setfield( L, -2, "__index" );
// register methods
luaL_setfuncs(L, bignum_methods, 0);
lua_pop( L, 1 ); // BIGNUM
return 1;
}