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48153b6244
xrdp/keygen/keygen.c
jsorg71 48153b6244 completed sign key and some cleanups
2007-06-09 23:08:16 +00:00

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