2
* Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved.
4
* This is free software; you can redistribute it and/or modify
5
* it under the terms of the GNU General Public License as published by
6
* the Free Software Foundation; either version 2 of the License, or
7
* (at your option) any later version.
9
* This software is distributed in the hope that it will be useful,
10
* but WITHOUT ANY WARRANTY; without even the implied warranty of
11
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12
* GNU General Public License for more details.
14
* You should have received a copy of the GNU General Public License
15
* along with this program; if not, write to the Free Software
16
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
21
* vncauth.c - Functions for VNC password management and authentication.
24
#ifdef __STRICT_ANSI__
28
#ifdef LIBVNCSERVER_HAVE_SYS_TYPES_H
29
#include <sys/types.h>
34
#include <rfb/rfbproto.h>
40
#ifdef LIBVNCSERVER_HAVE_SYS_STAT_H
54
/* libvncclient does not need this */
55
#ifndef rfbEncryptBytes
58
* We use a fixed key to store passwords, since we assume that our local
59
* file system is secure but nonetheless don't want to store passwords
63
static unsigned char fixedkey[8] = {23,82,107,6,35,78,88,7};
67
* Encrypt a password and store it in a file. Returns 0 if successful,
68
* 1 if the file could not be written.
72
rfbEncryptAndStorePasswd(char *passwd, char *fname)
76
unsigned char encryptedPasswd[8];
78
if ((fp = fopen(fname,"w")) == NULL) return 1;
80
/* windows security sux */
82
fchmod(fileno(fp), S_IRUSR|S_IWUSR);
85
/* pad password with nulls */
87
for (i = 0; i < 8; i++) {
88
if (i < strlen(passwd)) {
89
encryptedPasswd[i] = passwd[i];
91
encryptedPasswd[i] = 0;
95
/* Do encryption in-place - this way we overwrite our copy of the plaintext
98
rfbDesKey(fixedkey, EN0);
99
rfbDes(encryptedPasswd, encryptedPasswd);
101
for (i = 0; i < 8; i++) {
102
putc(encryptedPasswd[i], fp);
111
* Decrypt a password from a file. Returns a pointer to a newly allocated
112
* string containing the password or a null pointer if the password could
113
* not be retrieved for some reason.
117
rfbDecryptPasswdFromFile(char *fname)
121
unsigned char *passwd = (unsigned char *)malloc(9);
123
if ((fp = fopen(fname,"r")) == NULL) return NULL;
125
for (i = 0; i < 8; i++) {
136
rfbDesKey(fixedkey, DE1);
137
rfbDes(passwd, passwd);
141
return (char *)passwd;
146
* Generate CHALLENGESIZE random bytes for use in challenge-response
151
rfbRandomBytes(unsigned char *bytes)
154
static rfbBool s_srandom_called = FALSE;
156
if (!s_srandom_called) {
157
srandom((unsigned int)time(NULL) ^ (unsigned int)getpid());
158
s_srandom_called = TRUE;
161
for (i = 0; i < CHALLENGESIZE; i++) {
162
bytes[i] = (unsigned char)(random() & 255);
169
* Encrypt CHALLENGESIZE bytes in memory using a password.
173
rfbEncryptBytes(unsigned char *bytes, char *passwd)
175
unsigned char key[8];
178
/* key is simply password padded with nulls */
180
for (i = 0; i < 8; i++) {
181
if (i < strlen(passwd)) {
190
for (i = 0; i < CHALLENGESIZE; i += 8) {
191
rfbDes(bytes+i, bytes+i);