/** * xrdp: A Remote Desktop Protocol server. * * Copyright (C) Jay Sorg 2004-2014 * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * rsa key generator for xrdp */ /* references: http://www.securiteam.com/windowsntfocus/5EP010KG0G.html */ #if defined(HAVE_CONFIG_H) #include #endif #include "os_calls.h" #include "string_calls.h" #include "ssl_calls.h" #include "arch.h" #include "list.h" #include "file.h" /* this is the signature size in bytes */ #define TSSK_KEY_LENGTH 64 /* default to 2048 bit key size, can set changed, set */ static int g_key_size_bits = 2048; static tui8 g_exponent[4] = { 0x01, 0x00, 0x01, 0x00 }; /* 4 bytes public exponent */ static tui8 g_ppk_e[4] = { 0x5B, 0x7B, 0x88, 0xC0 }; /* 64 byte modulus */ static tui8 g_ppk_n[72] = /* 64 bytes + 8 bytes pad */ { 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 }; /* 64 bytes private exponent */ static tui8 g_ppk_d[108] = /* 64 bytes + 44 bytes pad */ { 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 }; /* 512 bit proprietary certificate dwVersion 0 4 bytes always 0x00000001 dwSigAlgId 4 4 bytes always 0x00000001 dwKeyAlgId 8 4 bytes always 0x00000001 wPublicKeyBlobType 12 2 bytes always 0x0006 wPublicKeyBlobLen 14 2 bytes 0x005C 92 bytes magic 16 4 bytes always 0x31415352 keylen 20 4 bytes 0x0048 72 bytes bitlen 24 4 bytes 0x0200 512 bits datalen 28 4 bytes 0x003F 63 bytes pubExp 32 4 bytes 0x00010001 modulus 36 72 bytes wSignatureBlobType 108 2 bytes always 0x0008 wSignatureBlobLen 110 2 bytes 0x0048 72 bytes SignatureBlob 112 72 bytes */ static tui8 g_testkey512[184] = /* 512 bit test key */ { 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, /* 0 */ 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, /* 32 */ 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, /* 64 */ 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, /* 96 */ 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, /* 128 */ 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, /* 160 */ 0xb6, 0x8e, 0xbe, 0x57, 0x57, 0xd2, 0xa9, 0x36, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; /* 2048 bit proprietary certificate dwVersion 0 4 bytes always 0x00000001 dwSigAlgId 4 4 bytes always 0x00000001 dwKeyAlgId 8 4 bytes always 0x00000001 wPublicKeyBlobType 12 2 bytes always 0x0006 wPublicKeyBlobLen 14 2 bytes 0x011C 284 bytes magic 16 4 bytes always 0x31415352 keylen 20 4 bytes 0x0108 264 bytes bitlen 24 4 bytes 0x0800 2048 bits datalen 28 4 bytes 0x00FF 255 bytes pubExp 32 4 bytes 0x00010001 modulus 36 264 bytes wSignatureBlobType 300 2 bytes always 0x0008 wSignatureBlobLen 302 2 bytes 0x0048 72 bytes SignatureBlob 304 72 bytes */ static tui8 g_testkey2048[376] = /* 2048 bit test key */ { 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, /* 0 */ 0x01, 0x00, 0x00, 0x00, 0x06, 0x00, 0x1c, 0x01, 0x52, 0x53, 0x41, 0x31, 0x08, 0x01, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0xff, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x13, 0x77, 0x6d, 0xd8, /* 32 */ 0x7b, 0x6e, 0x6f, 0xb4, 0x27, 0x6d, 0x70, 0x3a, 0x97, 0x5f, 0xcb, 0x50, 0x9b, 0x13, 0x6b, 0xc7, 0xba, 0xdf, 0x73, 0x54, 0x17, 0x35, 0xf0, 0x09, 0x9e, 0x9d, 0x0b, 0x6a, 0x2c, 0x9f, 0xd1, 0x0c, /* 64 */ 0xc6, 0x47, 0x83, 0xde, 0xca, 0x90, 0x20, 0xac, 0x70, 0x63, 0x9b, 0xb7, 0x49, 0x07, 0x0b, 0xf5, 0xf2, 0x38, 0x2a, 0x40, 0xff, 0xf1, 0xba, 0x97, 0x79, 0x3e, 0xd4, 0xd1, 0xf3, 0x41, 0x0f, 0x91, /* 96 */ 0xfe, 0x1a, 0x86, 0xf4, 0x1b, 0xef, 0xcc, 0x29, 0xa3, 0x35, 0x6f, 0x60, 0xfa, 0x98, 0x53, 0x51, 0x80, 0x57, 0x15, 0x2f, 0xe1, 0x8b, 0xd7, 0x86, 0x15, 0x2d, 0xb5, 0xec, 0x7a, 0xdd, 0xc5, 0x1d, /* 128 */ 0x1b, 0x88, 0x53, 0x67, 0x86, 0xe1, 0x6e, 0xcd, 0x4e, 0x2e, 0xfd, 0xd2, 0x49, 0x04, 0xfb, 0x1d, 0x95, 0xf0, 0xe9, 0x7f, 0x97, 0xa3, 0x1b, 0xb2, 0x92, 0x2e, 0x62, 0x2a, 0x96, 0xd4, 0xea, 0x18, /* 160 */ 0x8e, 0x99, 0x41, 0xea, 0x83, 0xb5, 0xf1, 0x0e, 0xea, 0x53, 0x70, 0x99, 0xd7, 0x9e, 0x0c, 0x65, 0x2b, 0xf4, 0xdc, 0x0e, 0xe7, 0x9e, 0xce, 0x04, 0x25, 0x01, 0x88, 0xc4, 0xc1, 0xd2, 0xa4, 0x18, /* 192 */ 0xc2, 0x8a, 0x52, 0x0f, 0x01, 0xb2, 0x71, 0x30, 0x44, 0x3f, 0x5b, 0x11, 0x2e, 0xe7, 0x53, 0xa0, 0xc8, 0x1f, 0x77, 0xaf, 0xb5, 0xbb, 0xaf, 0x12, 0xe8, 0x19, 0x0c, 0xf6, 0x1f, 0xa8, 0x3e, 0x11, /* 224 */ 0x34, 0xe4, 0xac, 0x1c, 0x1c, 0x00, 0xbb, 0xb9, 0x2f, 0xbb, 0x81, 0x76, 0x4e, 0x46, 0xda, 0x73, 0x00, 0x82, 0x71, 0xa4, 0x62, 0xc3, 0xd4, 0x3f, 0xda, 0x34, 0x54, 0x27, 0xe3, 0xd0, 0x3a, 0x73, /* 256 */ 0x2f, 0x99, 0xc4, 0x91, 0x56, 0x12, 0x98, 0xa8, 0x3b, 0x8d, 0x61, 0x83, 0x62, 0xb7, 0x20, 0x61, 0x4d, 0xc9, 0x41, 0xd1, 0x40, 0x02, 0x11, 0x4b, 0x63, 0x46, 0xc7, 0xc1, 0x00, 0x00, 0x00, 0x00, /* 288 */ 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x48, 0x00, 0x00, 0x50, 0xb7, 0x75, 0xf3, 0x77, 0x99, 0xb2, 0xd3, 0xdd, 0xcd, 0x83, 0x6e, 0xdb, 0x0a, 0x29, 0x88, 0x05, 0xb5, 0x8a, 0x49, 0xd5, 0xa8, 0x5a, /* 320 */ 0xc3, 0xb7, 0x18, 0xc2, 0x3c, 0x1e, 0xde, 0xd3, 0x8f, 0xdd, 0x21, 0x27, 0x84, 0xa0, 0xc8, 0x8d, 0x65, 0xce, 0x5d, 0x3d, 0x46, 0x65, 0x88, 0xfc, 0x35, 0x0a, 0x04, 0xa0, 0xda, 0xc1, 0xab, 0xbf, /* 352 */ 0xcd, 0xf1, 0x7e, 0x71, 0x7b, 0xf8, 0x4a, 0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; /*****************************************************************************/ static int out_params(void) { g_writeln("%s", ""); g_writeln("xrdp rsa key gen utility examples"); g_writeln(" xrdp-keygen xrdp ['path and file name' | auto] [512 or 2048]"); g_writeln(" xrdp-keygen test"); g_writeln("%s", ""); return 0; } /*****************************************************************************/ /* this is the special key signing algorithm */ static int sign_key(const char *e_data, int e_len, const char *n_data, int n_len, char *sign_data, int sign_len) { char *key; char *md5_final; void *md5; if ((e_len != 4) || ((n_len != 64) && (n_len != 256)) || (sign_len != 64)) { return 1; } if (n_len == 64) { key = (char *)g_malloc(184, 0); md5_final = (char *)g_malloc(64, 0); md5 = ssl_md5_info_create(); /* copy the test key */ g_memcpy(key, g_testkey512, 184); /* replace e and n */ g_memcpy(key + 32, e_data, e_len); g_memcpy(key + 36, n_data, n_len); ssl_md5_clear(md5); /* the first 108 bytes */ ssl_md5_transform(md5, key, 108); /* set the whole thing with 0xff */ g_memset(md5_final, 0xff, 64); /* digest 16 bytes */ ssl_md5_complete(md5, md5_final); /* set non 0xff array items */ md5_final[16] = 0; md5_final[62] = 1; md5_final[63] = 0; /* encrypt */ ssl_mod_exp(sign_data, sign_len, md5_final, 64, (char *)g_ppk_n, 64, (char *)g_ppk_d, 64); /* cleanup */ ssl_md5_info_delete(md5); g_free(key); g_free(md5_final); } else if (n_len == 256) { key = (char *)g_malloc(376, 0); md5_final = (char *)g_malloc(64, 0); md5 = ssl_md5_info_create(); /* copy the test key */ g_memcpy(key, g_testkey2048, 376); /* replace e and n */ g_memcpy(key + 32, e_data, e_len); g_memcpy(key + 36, n_data, n_len); ssl_md5_clear(md5); /* the first 300 bytes */ ssl_md5_transform(md5, key, 300); /* set the whole thing with 0xff */ g_memset(md5_final, 0xff, 64); /* digest 16 bytes */ ssl_md5_complete(md5, md5_final); /* set non 0xff array items */ md5_final[16] = 0; md5_final[62] = 1; md5_final[63] = 0; /* encrypt */ ssl_mod_exp(sign_data, sign_len, md5_final, 64, (char *)g_ppk_n, 64, (char *)g_ppk_d, 64); /* cleanup */ ssl_md5_info_delete(md5); g_free(key); g_free(md5_final); } return 0; } /*****************************************************************************/ static int write_out_line(int fd, const char *name, const 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 = (tui8)(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 save_all(const char *e_data, int e_len, const char *n_data, int n_len, const char *d_data, int d_len, const char *sign_data, int sign_len, const char *path_and_file_name) { int fd; char filename[256]; if (path_and_file_name == 0) { g_strncpy(filename, "rsakeys.ini", 255); } else { g_strncpy(filename, path_and_file_name, 255); } g_writeln("saving to %s", filename); g_writeln("%s", ""); if (g_file_exist(filename)) { if (g_file_delete(filename) == 0) { g_writeln("problem deleting %s, maybe no rights", filename); return 1; } } fd = g_file_open_rw(filename); if (fd != -1) { if (g_file_write(fd, "[keys]\n", 7) == -1) { g_writeln("problem writing to %s, maybe no rights", filename); g_file_close(fd); return 1; } 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); } else { g_writeln("problem opening %s, maybe no rights", filename); return 1; } g_file_close(fd); return 0; } /*****************************************************************************/ static int key_gen(const char *path_and_file_name) { char *e_data; char *n_data; char *d_data; char *sign_data; int e_len; int n_len; int d_len; int sign_len; int error; e_data = (char *)g_exponent; n_data = (char *)g_malloc(256, 0); d_data = (char *)g_malloc(256, 0); sign_data = (char *)g_malloc(64, 0); e_len = 4; n_len = g_key_size_bits / 8; d_len = n_len; sign_len = 64; error = 0; g_writeln("%s", ""); g_writeln("Generating %d bit rsa key...", g_key_size_bits); g_writeln("%s", ""); if (error == 0) { error = ssl_gen_key_xrdp1(g_key_size_bits, e_data, e_len, n_data, n_len, d_data, d_len); if (error != 0) { g_writeln("error %d in key_gen, ssl_gen_key_xrdp1", error); } } if (error == 0) { g_writeln("ssl_gen_key_xrdp1 ok"); g_writeln("%s", ""); error = sign_key(e_data, e_len, n_data, n_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, path_and_file_name); if (error != 0) { g_writeln("error %d in key_gen, save_all", error); } } g_free(n_data); g_free(d_data); g_free(sign_data); return error; } /*****************************************************************************/ static int key_gen_auto(void) { return key_gen("/etc/xrdp/rsakeys.ini"); } /*****************************************************************************/ static int key_test512(void) { char *md5_final; char *sig; void *md5; md5_final = (char *)g_malloc(64, 0); sig = (char *)g_malloc(64, 0); md5 = ssl_md5_info_create(); g_writeln("original key is:"); g_hexdump((char *)g_testkey512, 184); g_writeln("original exponent is:"); g_hexdump((char *)g_testkey512 + 32, 4); g_writeln("original modulus is:"); g_hexdump((char *)g_testkey512 + 36, 64); g_writeln("original signature is:"); g_hexdump((char *)g_testkey512 + 112, 64); ssl_md5_clear(md5); ssl_md5_transform(md5, (char *)g_testkey512, 108); g_memset(md5_final, 0xff, 64); ssl_md5_complete(md5, md5_final); 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, (char *)g_ppk_n, 64, (char *)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, (char *)g_testkey512 + 112, 64, (char *)g_ppk_n, 64, (char *)g_ppk_e, 4); g_writeln("decrypted hash of first 108 bytes of this key is:"); g_hexdump(md5_final, 64); ssl_md5_info_delete(md5); g_free(md5_final); g_free(sig); return 0; } /*****************************************************************************/ static int key_test2048(void) { char *md5_final; char *sig; void *md5; md5_final = (char *)g_malloc(64, 0); sig = (char *)g_malloc(64, 0); md5 = ssl_md5_info_create(); g_writeln("original key is:"); g_hexdump((char *)g_testkey2048, 376); g_writeln("original exponent is:"); g_hexdump((char *)g_testkey2048 + 32, 4); g_writeln("original modulus is:"); g_hexdump((char *)g_testkey2048 + 36, 256); g_writeln("original signature is:"); g_hexdump((char *)g_testkey2048 + 304, 64); ssl_md5_clear(md5); ssl_md5_transform(md5, (char *)g_testkey2048, 300); g_memset(md5_final, 0xff, 64); ssl_md5_complete(md5, md5_final); g_writeln("md5 hash of first 300 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, (char *)g_ppk_n, 64, (char *)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, (char *)g_testkey2048 + 304, 64, (char *)g_ppk_n, 64, (char *)g_ppk_e, 4); g_writeln("decrypted hash of first 108 bytes of this key is:"); g_hexdump(md5_final, 64); ssl_md5_info_delete(md5); g_free(md5_final); g_free(sig); return 0; } /*****************************************************************************/ int main(int argc, char **argv) { if (argc > 1) { if (g_strcasecmp(argv[1], "xrdp") == 0) { if (argc > 2) { if (argc > 3) { g_key_size_bits = g_atoi(argv[3]); if ((g_key_size_bits != 512) && (g_key_size_bits != 2048)) { out_params(); return 0; } } if (g_strcasecmp(argv[2], "auto") == 0) { if (g_getuid() != 0) { g_writeln("must run as root"); return 0; } return key_gen_auto(); } else { return key_gen(argv[2]); } } else { return key_gen(0); } } else if (g_strcasecmp(argv[1], "test") == 0) { g_writeln("%s", ""); g_writeln("testing 512 bit key"); key_test512(); g_writeln("%s", ""); g_writeln("testing 2048 bit key"); key_test2048(); return 0; } } out_params(); return 0; }