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505 lines
13 KiB
505 lines
13 KiB
/**
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* xrdp: A Remote Desktop Protocol server.
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*
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* Copyright (C) Jay Sorg 2004-2014
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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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 "os_calls.h"
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#include "ssl_calls.h"
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#include "arch.h"
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#include "list.h"
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#include "file.h"
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/* this is the signature size in bytes */
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#define TSSK_KEY_LENGTH 64
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/* default to 512 bit key size, can set changed, set */
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static int g_key_size_bits = 512;
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static int g_key_size_bytes = 64;
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static tui8 g_exponent[4] =
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{
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0x01, 0x00, 0x01, 0x00
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};
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static tui8 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 tui8 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 tui8 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 tui8 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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/* this is the installed signature */
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char inst_pub_sig[] = "0x6a,0x41,0xb1,0x43,0xcf,0x47,0x6f,0xf1,0xe6,0xcc,0xa1,\
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0x72,0x97,0xd9,0xe1,0x85,0x15,0xb3,0xc2,0x39,0xa0,0xa6,0x26,0x1a,0xb6,\
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0x49,0x01,0xfa,0xa6,0xda,0x60,0xd7,0x45,0xf7,0x2c,0xee,0xe4,0x8e,0x64,\
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0x2e,0x37,0x49,0xf0,0x4c,0x94,0x6f,0x08,0xf5,0x63,0x4c,0x56,0x29,0x55,\
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0x5a,0x63,0x41,0x2c,0x20,0x65,0x95,0x99,0xb1,0x15,0x7c";
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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("xrdp rsa key gen utility examples");
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g_writeln(" xrdp-keygen xrdp ['path and file name' | auto]");
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g_writeln(" xrdp-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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/* this is the special key signing algorithm */
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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 *sign_data, int sign_len)
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{
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char *key;
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char *md5_final;
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void *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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key = (char *)g_malloc(176, 0);
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md5_final = (char *)g_malloc(64, 0);
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md5 = ssl_md5_info_create();
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/* copy the test key */
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g_memcpy(key, g_testkey, 176);
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/* replace e and n */
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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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ssl_md5_clear(md5);
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/* the first 108 bytes */
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ssl_md5_transform(md5, key, 108);
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/* set the whole thing with 0xff */
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g_memset(md5_final, 0xff, 64);
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/* digest 16 bytes */
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ssl_md5_complete(md5, md5_final);
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/* set non 0xff array items */
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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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/* encrypt */
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ssl_mod_exp(sign_data, 64, md5_final, 64, (char *)g_ppk_n, 64,
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(char *)g_ppk_d, 64);
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/* cleanup */
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ssl_md5_info_delete(md5);
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g_free(key);
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g_free(md5_final);
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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 = (tui8)(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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const char *path_and_file_name)
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{
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int fd;
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char filename[256];
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if (path_and_file_name == 0)
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{
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g_strncpy(filename, "rsakeys.ini", 255);
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}
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else
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{
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g_strncpy(filename, path_and_file_name, 255);
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}
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g_writeln("saving to %s", filename);
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g_writeln("");
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if (g_file_exist(filename))
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{
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if (g_file_delete(filename) == 0)
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{
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g_writeln("problem deleting %s, maybe no rights", filename);
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return 1;
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}
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}
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fd = g_file_open(filename);
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if (fd > 0)
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{
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if (g_file_write(fd, "[keys]\n", 7) == -1)
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{
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g_writeln("problem writing to %s, maybe no rights", filename);
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return 1;
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}
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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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else
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{
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g_writeln("problem opening %s, maybe no rights", filename);
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return 1;
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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(const char *path_and_file_name)
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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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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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e_data = (char *)g_exponent;
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n_data = (char *)g_malloc(64, 0);
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d_data = (char *)g_malloc(64, 0);
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sign_data = (char *)g_malloc(64, 0);
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e_len = 4;
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n_len = 64;
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d_len = 64;
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sign_len = 64;
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error = 0;
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g_writeln("");
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g_writeln("Generating %d bit rsa key...", g_key_size_bits);
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g_writeln("");
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if (error == 0)
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{
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error = ssl_gen_key_xrdp1(g_key_size_bits, e_data, e_len, n_data, n_len,
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d_data, d_len);
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if (error != 0)
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{
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g_writeln("error %d in key_gen, ssl_gen_key_xrdp1", 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("ssl_gen_key_xrdp1 ok");
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g_writeln("");
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error = sign_key(e_data, e_len, n_data, n_len, 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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}
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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, path_and_file_name);
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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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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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/* returns boolean */
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static int APP_CC
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key_gen_run_it(void)
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{
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int fd;
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int index;
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int rv;
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struct list *names;
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struct list *values;
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char *name;
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char *value;
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if (!g_file_exist("/etc/xrdp/rsakeys.ini"))
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{
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return 1;
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}
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if (g_file_get_size("/etc/xrdp/rsakeys.ini") < 10)
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{
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return 1;
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}
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fd = g_file_open("/etc/xrdp/rsakeys.ini");
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if (fd < 0)
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{
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return 1;
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}
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rv = 0;
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names = list_create();
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names->auto_free = 1;
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values = list_create();
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values->auto_free = 1;
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if (file_read_section(fd, "keys", names, values) == 0)
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{
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for (index = 0; index < names->count; index++)
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{
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name = (char *)list_get_item(names, index);
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value = (char *)list_get_item(values, index);
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if (g_strcasecmp(name, "pub_sig") == 0)
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{
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if (g_strcasecmp(value, inst_pub_sig) == 0)
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{
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rv = 1;
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}
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}
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}
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}
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else
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{
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g_writeln("error reading keys section of rsakeys.ini");
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}
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list_delete(names);
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list_delete(values);
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g_file_close(fd);
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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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key_gen_auto(void)
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{
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if (key_gen_run_it())
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{
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return key_gen("/etc/xrdp/rsakeys.ini");
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}
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g_writeln("xrdp-keygen does not need to run");
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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_test(void)
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{
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char *md5_final;
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char *sig;
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void *md5;
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md5_final = (char *)g_malloc(64, 0);
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sig = (char *)g_malloc(64, 0);
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md5 = ssl_md5_info_create();
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g_writeln("original key is:");
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g_hexdump((char *)g_testkey, 176);
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g_writeln("original exponent is:");
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g_hexdump((char *)g_testkey + 32, 4);
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g_writeln("original modulus is:");
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g_hexdump((char *)g_testkey + 36, 64);
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g_writeln("original signature is:");
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g_hexdump((char *)g_testkey + 112, 64);
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ssl_md5_clear(md5);
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ssl_md5_transform(md5, (char *)g_testkey, 108);
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g_memset(md5_final, 0xff, 64);
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ssl_md5_complete(md5, md5_final);
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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;
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md5_final[62] = 1;
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md5_final[63] = 0;
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ssl_mod_exp(sig, 64, md5_final, 64, (char *)g_ppk_n, 64, (char *)g_ppk_d, 64);
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g_writeln("produced signature(this should match original \
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signature above) is:");
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g_hexdump(sig, 64);
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g_memset(md5_final, 0, 64);
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|
ssl_mod_exp(md5_final, 64, (char *)g_testkey + 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;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
int DEFAULT_CC
|
|
main(int argc, char **argv)
|
|
{
|
|
if (argc > 1)
|
|
{
|
|
if (g_strcasecmp(argv[1], "xrdp") == 0)
|
|
{
|
|
if (argc > 2)
|
|
{
|
|
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)
|
|
{
|
|
return key_test();
|
|
}
|
|
}
|
|
|
|
out_params();
|
|
return 0;
|
|
}
|