/* 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 #include #include #include #include #include #include #include #include #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_test_e[4] = { 0x01, 0x00, 0x01, 0x00 }; static char g_test_n[64] = { 0x67, 0xab, 0x0e, 0x6a, 0x9f, 0xd6, 0x2b, 0xa3, 0x32, 0x2f, 0x41, 0xd1, 0xce, 0xee, 0x61, 0xc3, 0x76, 0x0b, 0x26, 0x11, 0x70, 0x48, 0x8a, 0x8d, 0x23, 0x81, 0x95, 0xa0, 0x39, 0xf7, 0x5b, 0xaa, 0x3e, 0xf1, 0xed, 0xb8, 0xc4, 0xee, 0xce, 0x5f, 0x6a, 0xf5, 0x43, 0xce, 0x5f, 0x60, 0xca, 0x6c, 0x06, 0x75, 0xae, 0xc0, 0xd6, 0xa4, 0x0c, 0x92, 0xa4, 0xc6, 0x75, 0xea, 0x64, 0xb2, 0x50, 0x5b }; static char g_test_sign[64] = { 0x6a, 0x41, 0xb1, 0x43, 0xcf, 0x47, 0x6f, 0xf1, 0xe6, 0xcc, 0xa1, 0x72, 0x97, 0xd9, 0xe1, 0x85, 0x15, 0xb3, 0xc2, 0x39, 0xa0, 0xa6, 0x26, 0x1a, 0xb6, 0x49, 0x01, 0xfa, 0xa6, 0xda, 0x60, 0xd7, 0x45, 0xf7, 0x2c, 0xee, 0xe4, 0x8e, 0x64, 0x2e, 0x37, 0x49, 0xf0, 0x4c, 0x94, 0x6f, 0x08, 0xf5, 0x63, 0x4c, 0x56, 0x29, 0x55, 0x5a, 0x63, 0x41, 0x2c, 0x20, 0x65, 0x95, 0x99, 0xb1, 0x15, 0x7c }; static char g_test_d[64] = { 0x41, 0x93, 0x05, 0xB1, 0xF4, 0x38, 0xFC, 0x47, 0x88, 0xC4, 0x7F, 0x83, 0x8C, 0xEC, 0x90, 0xDA, 0x0C, 0x8A, 0xB5, 0xAE, 0x61, 0x32, 0x72, 0xF5, 0x2B, 0xD1, 0x7B, 0x5F, 0x44, 0xC0, 0x7C, 0xBD, 0x8A, 0x35, 0xFA, 0xAE, 0x30, 0xF6, 0xC4, 0x6B, 0x55, 0xA7, 0x65, 0xEF, 0xF4, 0xB2, 0xAB, 0x18, 0x4E, 0xAA, 0xE6, 0xDC, 0x71, 0x17, 0x3B, 0x4C, 0xC2, 0x15, 0x4C, 0xF7, 0x81, 0xBB, 0xF0, 0x03 }; static char g_testa[22 * 8] = { 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 out_params(void) { g_writeln(""); g_writeln("key gen utility example './keygen xrdp'"); 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) { g_writeln("todo sign here"); g_writeln(""); 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); } } 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; } /*****************************************************************************/ 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 key_test(void) { char md5_final[16]; char sig[64]; unsigned char* p; MD5_CTX md5; g_writeln("original key is:"); g_hexdump(g_testa, 176); g_writeln("original exponent is:"); g_hexdump(g_testa + 32, 4); g_writeln("original modulus is:"); g_hexdump(g_testa + 36, 64); g_writeln("original signature is:"); g_hexdump(g_testa + 112, 64); MD5_Init(&md5); p = (unsigned char*)g_testa; MD5_Update(&md5, p, 108); p = (unsigned char*)md5_final; MD5_Final(p, &md5); g_writeln("md5 hash of first 108 bytes of this key is:"); g_hexdump(md5_final, 16); ssl_mod_exp(sig, 64, md5_final, 16, g_ppk_n, 64, g_ppk_d, 64); g_writeln("produced signature(fix this, it should match original signature above) is:"); g_hexdump(sig, 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; }