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476 lines
12 KiB
476 lines
12 KiB
/*
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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xrdp: A Remote Desktop Protocol server.
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Copyright (C) Jay Sorg 2007
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rsa key generator for xrdp
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*/
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/*
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references:
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http://www.securiteam.com/windowsntfocus/5EP010KG0G.html
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <openssl/rc4.h>
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#include <openssl/md5.h>
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#include <openssl/sha.h>
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#include <openssl/bn.h>
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#include <openssl/x509v3.h>
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#include <openssl/rsa.h>
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#include "os_calls.h"
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#include "arch.h"
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#define MY_KEY_SIZE 512
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static char g_rev_exponent[4] =
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{
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0x00, 0x01, 0x00, 0x01
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};
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static char g_ppk_e[4] =
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{
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0x5B, 0x7B, 0x88, 0xC0
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};
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static char g_ppk_n[72] =
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{
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0x3D, 0x3A, 0x5E, 0xBD, 0x72, 0x43, 0x3E, 0xC9,
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0x4D, 0xBB, 0xC1, 0x1E, 0x4A, 0xBA, 0x5F, 0xCB,
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0x3E, 0x88, 0x20, 0x87, 0xEF, 0xF5, 0xC1, 0xE2,
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0xD7, 0xB7, 0x6B, 0x9A, 0xF2, 0x52, 0x45, 0x95,
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0xCE, 0x63, 0x65, 0x6B, 0x58, 0x3A, 0xFE, 0xEF,
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0x7C, 0xE7, 0xBF, 0xFE, 0x3D, 0xF6, 0x5C, 0x7D,
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0x6C, 0x5E, 0x06, 0x09, 0x1A, 0xF5, 0x61, 0xBB,
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0x20, 0x93, 0x09, 0x5F, 0x05, 0x6D, 0xEA, 0x87,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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static char g_ppk_d[108] =
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{
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0x87, 0xA7, 0x19, 0x32, 0xDA, 0x11, 0x87, 0x55,
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0x58, 0x00, 0x16, 0x16, 0x25, 0x65, 0x68, 0xF8,
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0x24, 0x3E, 0xE6, 0xFA, 0xE9, 0x67, 0x49, 0x94,
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0xCF, 0x92, 0xCC, 0x33, 0x99, 0xE8, 0x08, 0x60,
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0x17, 0x9A, 0x12, 0x9F, 0x24, 0xDD, 0xB1, 0x24,
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0x99, 0xC7, 0x3A, 0xB8, 0x0A, 0x7B, 0x0D, 0xDD,
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0x35, 0x07, 0x79, 0x17, 0x0B, 0x51, 0x9B, 0xB3,
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0xC7, 0x10, 0x01, 0x13, 0xE7, 0x3F, 0xF3, 0x5F,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00
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};
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static char g_testkey[176] =
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{
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0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
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0x01, 0x00, 0x00, 0x00, 0x06, 0x00, 0x5c, 0x00,
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0x52, 0x53, 0x41, 0x31, 0x48, 0x00, 0x00, 0x00,
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0x00, 0x02, 0x00, 0x00, 0x3f, 0x00, 0x00, 0x00,
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0x01, 0x00, 0x01, 0x00, 0x79, 0x6f, 0xb4, 0xdf,
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0xa6, 0x95, 0xb9, 0xa9, 0x61, 0xe3, 0xc4, 0x5e,
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0xff, 0x6b, 0xd8, 0x81, 0x8a, 0x12, 0x4a, 0x93,
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0x42, 0x97, 0x18, 0x93, 0xac, 0xd1, 0x3a, 0x38,
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0x3c, 0x68, 0x50, 0x19, 0x31, 0xb6, 0x84, 0x51,
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0x79, 0xfb, 0x1c, 0xe7, 0xe3, 0x99, 0x20, 0xc7,
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0x84, 0xdf, 0xd1, 0xaa, 0xb5, 0x15, 0xef, 0x47,
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0x7e, 0xfc, 0x88, 0xeb, 0x29, 0xc3, 0x27, 0x5a,
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0x35, 0xf8, 0xfd, 0xaa, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x08, 0x00, 0x48, 0x00,
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0x32, 0x3b, 0xde, 0x6f, 0x18, 0x97, 0x1e, 0xc3,
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0x6b, 0x2b, 0x2d, 0xe4, 0xfc, 0x2d, 0xa2, 0x8e,
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0x32, 0x3c, 0xf3, 0x1b, 0x24, 0x90, 0x57, 0x4d,
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0x8e, 0xe4, 0x69, 0xfc, 0x16, 0x8d, 0x41, 0x92,
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0x78, 0xc7, 0x9c, 0xb4, 0x26, 0xff, 0xe8, 0x3e,
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0xa1, 0x8a, 0xf5, 0x57, 0xc0, 0x7f, 0x3e, 0x21,
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0x17, 0x32, 0x30, 0x6f, 0x79, 0xe1, 0x36, 0xcd,
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0xb6, 0x8e, 0xbe, 0x57, 0x57, 0xd2, 0xa9, 0x36
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};
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/*****************************************************************************/
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static void
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reverse(char* p, int len)
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{
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int i;
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int j;
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char temp;
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for (i = 0, j = len - 1; i < j; i++, j--)
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{
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temp = p[i];
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p[i] = p[j];
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p[j] = temp;
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}
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}
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/*****************************************************************************/
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static int APP_CC
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ssl_mod_exp(char* out, int out_len, char* in, int in_len,
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char* mod, int mod_len, char* exp, int exp_len)
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{
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BN_CTX* ctx;
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BIGNUM lmod;
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BIGNUM lexp;
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BIGNUM lin;
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BIGNUM lout;
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int rv;
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char* l_out;
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char* l_in;
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char* l_mod;
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char* l_exp;
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l_out = (char*)g_malloc(out_len, 1);
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l_in = (char*)g_malloc(in_len, 1);
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l_mod = (char*)g_malloc(mod_len, 1);
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l_exp = (char*)g_malloc(exp_len, 1);
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g_memcpy(l_in, in, in_len);
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g_memcpy(l_mod, mod, mod_len);
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g_memcpy(l_exp, exp, exp_len);
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reverse(l_in, in_len);
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reverse(l_mod, mod_len);
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reverse(l_exp, exp_len);
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ctx = BN_CTX_new();
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BN_init(&lmod);
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BN_init(&lexp);
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BN_init(&lin);
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BN_init(&lout);
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BN_bin2bn((unsigned char*)l_mod, mod_len, &lmod);
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BN_bin2bn((unsigned char*)l_exp, exp_len, &lexp);
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BN_bin2bn((unsigned char*)l_in, in_len, &lin);
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BN_mod_exp(&lout, &lin, &lexp, &lmod, ctx);
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rv = BN_bn2bin(&lout, (unsigned char*)l_out);
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if (rv <= out_len)
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{
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reverse(l_out, rv);
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g_memcpy(out, l_out, out_len);
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}
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else
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{
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rv = 0;
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}
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BN_free(&lin);
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BN_free(&lout);
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BN_free(&lexp);
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BN_free(&lmod);
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BN_CTX_free(ctx);
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g_free(l_out);
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g_free(l_in);
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g_free(l_mod);
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g_free(l_exp);
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return rv;
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}
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/*****************************************************************************/
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static int APP_CC
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out_params(void)
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{
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g_writeln("");
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g_writeln("key gen utility examples");
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g_writeln(" './keygen xrdp'");
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g_writeln(" './keygen test'");
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g_writeln("");
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return 0;
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}
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/*****************************************************************************/
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static int APP_CC
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sign_key(char* e_data, int e_len, char* n_data, int n_len,
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char* d_data, int d_len, char* sign_data, int sign_len)
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{
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char key[176];
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char md5_final[64];
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MD5_CTX md5;
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if ((e_len != 4) || (n_len != 64) || (sign_len != 64))
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{
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return 1;
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}
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g_memcpy(key, g_testkey, 176);
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g_memcpy(key + 32, e_data, 4);
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g_memcpy(key + 36, n_data, 64);
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MD5_Init(&md5);
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MD5_Update(&md5, (unsigned char*)key, 108);
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g_memset(md5_final, 0xff, 64);
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MD5_Final((unsigned char*)md5_final, &md5);
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md5_final[16] = 0;
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md5_final[62] = 1;
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md5_final[63] = 0;
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ssl_mod_exp(sign_data, 64, md5_final, 64, g_ppk_n, 64, g_ppk_d, 64);
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return 0;
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}
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/*****************************************************************************/
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static int APP_CC
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write_out_line(int fd, char* name, char* data, int len)
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{
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int max;
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int error;
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int index;
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int data_item;
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int buf_pos;
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char* buf;
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char* text;
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text = (char*)g_malloc(256, 0);
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max = len;
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max = max * 10;
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buf_pos = g_strlen(name);
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max = max + buf_pos + 16;
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buf = (char*)g_malloc(max, 0);
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g_strncpy(buf, name, max - 1);
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buf[buf_pos] = '=';
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buf_pos++;
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for (index = 0; index < len; index++)
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{
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data_item = (unsigned char)data[index];
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g_snprintf(text, 255, "0x%2.2x", data_item);
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if (index != 0)
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{
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buf[buf_pos] = ',';
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buf_pos++;
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}
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buf[buf_pos] = text[0];
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buf_pos++;
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buf[buf_pos] = text[1];
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buf_pos++;
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buf[buf_pos] = text[2];
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buf_pos++;
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buf[buf_pos] = text[3];
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buf_pos++;
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}
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buf[buf_pos] = '\n';
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buf_pos++;
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buf[buf_pos] = 0;
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error = g_file_write(fd, buf, buf_pos) == -1;
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g_free(buf);
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g_free(text);
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return error;
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}
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/*****************************************************************************/
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static int APP_CC
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save_all(char* e_data, int e_len, char* n_data, int n_len,
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char* d_data, int d_len, char* sign_data, int sign_len)
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{
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int fd;
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g_writeln("saving to rsakeys.ini");
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g_writeln("");
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if (g_file_exist("rsakeys.ini"))
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{
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g_file_delete("rsakeys.ini");
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}
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fd = g_file_open("rsakeys.ini");
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if (fd > 0)
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{
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g_file_write(fd, "[keys]\n", 7);
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write_out_line(fd, "pub_exp", e_data, e_len);
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write_out_line(fd, "pub_mod", n_data, n_len);
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write_out_line(fd, "pub_sig", sign_data, sign_len);
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write_out_line(fd, "pri_exp", d_data, d_len);
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}
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g_file_close(fd);
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return 0;
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}
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/*****************************************************************************/
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static int APP_CC
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key_gen(void)
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{
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char* e_data;
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char* n_data;
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char* d_data;
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char* sign_data;
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unsigned char* p;
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int len;
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int e_len;
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int n_len;
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int d_len;
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int sign_len;
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int error;
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int offset;
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BN_CTX* my_ctx;
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RSA* my_key;
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BIGNUM* my_e;
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e_data = 0;
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n_data = 0;
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d_data = 0;
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sign_data = 0;
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e_len = 0;
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n_len = 0;
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d_len = 0;
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sign_len = 0;
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error = 0;
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my_ctx = BN_CTX_new();
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my_e = BN_new();
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p = (unsigned char*)g_rev_exponent;
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len = sizeof(g_rev_exponent);
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BN_bin2bn(p, len, my_e);
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my_key = RSA_new();
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g_writeln("");
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g_writeln("Generating %d bit rsa key...", MY_KEY_SIZE);
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g_writeln("");
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if (error == 0)
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{
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/* RSA_generate_key_ex returns boolean */
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error = RSA_generate_key_ex(my_key, MY_KEY_SIZE, my_e, 0) == 0;
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if (error != 0)
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{
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g_writeln("error %d in key_gen, RSA_generate_key_ex", error);
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}
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}
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if (error == 0)
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{
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g_writeln("RSA_generate_key_ex ok");
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g_writeln("");
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e_len = BN_num_bytes(my_key->e);
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if (e_len > 0)
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{
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e_data = (char*)g_malloc(e_len, 1);
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offset = (((e_len + 3) / 4) * 4) - e_len;
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e_len = e_len + offset;
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p = (unsigned char*)(e_data + offset);
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BN_bn2bin(my_key->e, p);
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reverse(e_data, e_len);
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g_writeln("public exponent size %d bytes", e_len);
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g_hexdump(e_data, e_len);
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g_writeln("");
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}
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n_len = BN_num_bytes(my_key->n);
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if (n_len > 0)
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{
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n_data = (char*)g_malloc(n_len, 1);
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offset = (((n_len + 3) / 4) * 4) - n_len;
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n_len = n_len + offset;
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p = (unsigned char*)(n_data + offset);
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BN_bn2bin(my_key->n, p);
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reverse(n_data, n_len);
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g_writeln("public modulus size %d bytes", n_len);
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g_hexdump(n_data, n_len);
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g_writeln("");
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/* signature is same size as public modulus */
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sign_data = (char*)g_malloc(n_len, 1);
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sign_len = n_len;
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}
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d_len = BN_num_bytes(my_key->d);
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if (d_len > 0)
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{
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d_data = (char*)g_malloc(d_len, 0);
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offset = (((d_len + 3) / 4) * 4) - d_len;
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d_len = d_len + offset;
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p = (unsigned char*)(d_data + offset);
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BN_bn2bin(my_key->d, p);
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reverse(d_data, d_len);
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g_writeln("private exponent size %d bytes", d_len);
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g_hexdump(d_data, d_len);
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g_writeln("");
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}
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error = sign_key(e_data, e_len, n_data, n_len, d_data, d_len,
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sign_data, sign_len);
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if (error != 0)
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{
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g_writeln("error %d in key_gen, sign_key", error);
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}
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else
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{
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g_writeln("signature size %d bytes", sign_len);
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g_hexdump(sign_data, sign_len);
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g_writeln("");
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}
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}
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if (error == 0)
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{
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error = save_all(e_data, e_len, n_data, n_len, d_data, d_len,
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sign_data, sign_len);
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if (error != 0)
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{
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g_writeln("error %d in key_gen, save_all", error);
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}
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}
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BN_free(my_e);
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RSA_free(my_key);
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BN_CTX_free(my_ctx);
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g_free(e_data);
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g_free(n_data);
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g_free(d_data);
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g_free(sign_data);
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return error;
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}
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/*****************************************************************************/
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static int APP_CC
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key_test(void)
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{
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char md5_final[64];
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char sig[64];
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MD5_CTX md5;
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g_writeln("original key is:");
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g_hexdump(g_testkey, 176);
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g_writeln("original exponent is:");
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g_hexdump(g_testkey + 32, 4);
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g_writeln("original modulus is:");
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g_hexdump(g_testkey + 36, 64);
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g_writeln("original signature is:");
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g_hexdump(g_testkey + 112, 64);
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MD5_Init(&md5);
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MD5_Update(&md5, (unsigned char*)g_testkey, 108);
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g_memset(md5_final, 0xff, 64);
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MD5_Final((unsigned char*)md5_final, &md5);
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g_writeln("md5 hash of first 108 bytes of this key is:");
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g_hexdump(md5_final, 16);
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|
md5_final[16] = 0;
|
|
md5_final[62] = 1;
|
|
md5_final[63] = 0;
|
|
ssl_mod_exp(sig, 64, md5_final, 64, g_ppk_n, 64, g_ppk_d, 64);
|
|
g_writeln("produced signature(this should match original signature above) is:");
|
|
g_hexdump(sig, 64);
|
|
g_memset(md5_final, 0, 64);
|
|
ssl_mod_exp(md5_final, 64, g_testkey + 112, 64, g_ppk_n, 64, g_ppk_e, 4);
|
|
g_writeln("decrypted hash of first 108 bytes of this key is:");
|
|
g_hexdump(md5_final, 64);
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
int DEFAULT_CC
|
|
main(int argc, char** argv)
|
|
{
|
|
if (argc == 2)
|
|
{
|
|
if (g_strcasecmp(argv[1], "xrdp") == 0)
|
|
{
|
|
return key_gen();
|
|
}
|
|
else if (g_strcasecmp(argv[1], "test") == 0)
|
|
{
|
|
return key_test();
|
|
}
|
|
}
|
|
out_params();
|
|
return 0;
|
|
}
|