Shared TDE VNC library sources
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libtdevnc/common/vncauth.c

215 lines
4.3 KiB

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/*
* Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved.
*
* This 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 software 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
/*
* vncauth.c - Functions for VNC password management and authentication.
*/
#ifdef __STRICT_ANSI__
#define _BSD_SOURCE
#define _POSIX_SOURCE
#define _XOPEN_SOURCE 600
#endif
#ifdef LIBVNCSERVER_HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#ifdef LIBVNCSERVER_HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <rfb/rfbproto.h>
#include "d3des.h"
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#include <string.h>
#include <math.h>
#ifdef LIBVNCSERVER_HAVE_SYS_STAT_H
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#include <sys/stat.h>
#endif
#include <time.h>
#ifdef WIN32
#define srandom srand
#define random rand
#else
#include <sys/time.h>
#endif
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/* libvncclient does not need this */
#ifndef rfbEncryptBytes
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/*
* We use a fixed key to store passwords, since we assume that our local
* file system is secure but nonetheless don't want to store passwords
* as plaintext.
*/
static unsigned char fixedkey[8] = {23,82,107,6,35,78,88,7};
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/*
* Encrypt a password and store it in a file. Returns 0 if successful,
* 1 if the file could not be written.
*/
int
rfbEncryptAndStorePasswd(char *passwd, char *fname)
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{
FILE *fp;
unsigned int i;
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unsigned char encryptedPasswd[8];
if ((fp = fopen(fname,"w")) == NULL) return 1;
/* windows security sux */
#ifndef WIN32
fchmod(fileno(fp), S_IRUSR|S_IWUSR);
#endif
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/* pad password with nulls */
for (i = 0; i < 8; i++) {
if (i < strlen(passwd)) {
encryptedPasswd[i] = passwd[i];
} else {
encryptedPasswd[i] = 0;
}
}
/* Do encryption in-place - this way we overwrite our copy of the plaintext
password */
rfbDesKey(fixedkey, EN0);
rfbDes(encryptedPasswd, encryptedPasswd);
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for (i = 0; i < 8; i++) {
putc(encryptedPasswd[i], fp);
}
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fclose(fp);
return 0;
}
/*
* Decrypt a password from a file. Returns a pointer to a newly allocated
* string containing the password or a null pointer if the password could
* not be retrieved for some reason.
*/
char *
rfbDecryptPasswdFromFile(char *fname)
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{
FILE *fp;
int i, ch;
unsigned char *passwd = (unsigned char *)malloc(9);
if ((fp = fopen(fname,"r")) == NULL) {
free(passwd);
return NULL;
}
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for (i = 0; i < 8; i++) {
ch = getc(fp);
if (ch == EOF) {
fclose(fp);
free(passwd);
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return NULL;
}
passwd[i] = ch;
}
fclose(fp);
rfbDesKey(fixedkey, DE1);
rfbDes(passwd, passwd);
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passwd[8] = 0;
return (char *)passwd;
}
/*
* Generate CHALLENGESIZE random bytes for use in challenge-response
* authentication.
*/
void
rfbRandomBytes(unsigned char *bytes)
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{
int i;
static rfbBool s_srandom_called = FALSE;
if (!s_srandom_called) {
srandom((unsigned int)time(NULL) ^ (unsigned int)getpid());
s_srandom_called = TRUE;
}
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for (i = 0; i < CHALLENGESIZE; i++) {
bytes[i] = (unsigned char)(random() & 255);
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}
}
#endif
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/*
* Encrypt CHALLENGESIZE bytes in memory using a password.
*/
void
rfbEncryptBytes(unsigned char *bytes, char *passwd)
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{
unsigned char key[8];
unsigned int i;
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/* key is simply password padded with nulls */
for (i = 0; i < 8; i++) {
if (i < strlen(passwd)) {
key[i] = passwd[i];
} else {
key[i] = 0;
}
}
rfbDesKey(key, EN0);
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for (i = 0; i < CHALLENGESIZE; i += 8) {
rfbDes(bytes+i, bytes+i);
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}
}
void
rfbEncryptBytes2(unsigned char *where, const int length, unsigned char *key) {
int i, j;
rfbDesKey(key, EN0);
for (i = 0; i< 8; i++)
where[i] ^= key[i];
rfbDes(where, where);
for (i = 8; i < length; i += 8) {
for (j = 0; j < 8; j++)
where[i + j] ^= where[i + j - 8];
rfbDes(where + i, where + i);
}
}