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/********************************************************************\
* BitlBee -- An IRC to other IM-networks gateway *
* *
* Copyright 2002-2004 Sjoerd Hemminga and others *
\********************************************************************/
/* A little bit of encryption for the users' passwords */
/*
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 with
the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
if not, write to the Free Software Foundation, Inc., 59 Temple Place,
Suite 330, Boston, MA 02111-1307 USA
*/
/* [WvG] This file can also be compiled into a stand-alone program
which can encode/decode BitlBee account files. The main() will be
included if CRYPTING_MAIN is defined. Or just do "make decode" and
the programs will be built. */
#ifndef CRYPTING_MAIN
#define BITLBEE_CORE
#include "bitlbee.h"
#include "irc.h"
#include "md5.h"
#include "crypting.h"
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#else
typedef struct irc
{
char *password;
} irc_t;
#define set_add( a, b, c, d )
#define set_find( a, b ) NULL
#include "md5.h"
#include "crypting.h"
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#endif
/*\
* [SH] Do _not_ call this if it's not entirely sure that it will not cause
* harm to another users file, since this does not check the password for
* correctness.
\*/
/* USE WITH CAUTION!
Sets pass without checking */
void setpassnc (irc_t *irc, char *pass) {
if (!set_find (irc, "password"))
set_add (irc, "password", NULL, passchange);
if (irc->password) g_free (irc->password);
if (pass) {
irc->password = g_strdup (pass);
irc_usermsg (irc, "Password successfully changed");
} else {
irc->password = NULL;
}
}
char *passchange (irc_t *irc, void *set, char *value) {
setpassnc (irc, value);
return (NULL);
}
int setpass (irc_t *irc, char *pass, char* md5sum) {
md5_state_t md5state;
md5_byte_t digest[16];
int i, j;
char digits[3];
md5_init (&md5state);
md5_append (&md5state, (unsigned char *)pass, strlen (pass));
md5_finish (&md5state, digest);
for (i = 0, j = 0; i < 16; i++, j += 2) {
/* Check password for correctness */
g_snprintf (digits, sizeof (digits), "%02x\n", digest[i]);
if (digits[0] != md5sum[j]) return (-1);
if (digits[1] != md5sum[j + 1]) return (-1);
}
/* If pass is correct, we end up here and we set the pass */
setpassnc (irc, pass);
return (0);
}
char *hashpass (irc_t *irc) {
md5_state_t md5state;
md5_byte_t digest[16];
int i;
char digits[3];
char *rv;
if (irc->password == NULL) return (NULL);
rv = (char *)g_malloc (33);
memset (rv, 0, 33);
md5_init (&md5state);
md5_append (&md5state, (unsigned char *)irc->password, strlen (irc->password));
md5_finish (&md5state, digest);
for (i = 0; i < 16; i++) {
/* Build a hash of the pass */
g_snprintf (digits, sizeof (digits), "%02x", digest[i]);
strcat (rv, digits);
}
return (rv);
}
char *obfucrypt (irc_t *irc, char *line) {
int i, j;
char *rv;
if (irc->password == NULL) return (NULL);
rv = (char *)g_malloc (strlen (line) + 1);
memset (rv, '\0', strlen (line) + 1);
i = j = 0;
while (*line) {
/* Encrypt/obfuscate the line, using the password */
if (*(signed char*)line < 0) *line = - (*line);
if (((signed char*)irc->password)[i] < 0) irc->password[i] = - irc->password[i];
rv[j] = *line + irc->password[i]; /* Overflow intended */
line++;
if (!irc->password[++i]) i = 0;
j++;
}
return (rv);
}
char *deobfucrypt (irc_t *irc, char *line) {
int i, j;
char *rv;
if (irc->password == NULL) return (NULL);
rv = (char *)g_malloc (strlen (line) + 1);
memset (rv, '\0', strlen (line) + 1);
i = j = 0;
while (*line) {
/* Decrypt/deobfuscate the line, using the pass */
rv[j] = *line - irc->password[i]; /* Overflow intended */
line++;
if (!irc->password[++i]) i = 0;
j++;
}
return (rv);
}
#ifdef CRYPTING_MAIN
/* A little main() function for people who want a stand-alone program to
encode/decode BitlCrypted files. */
int main( int argc, char *argv[] )
{
irc_t *irc = g_malloc( sizeof( irc_t ) );
char *hash, *action, line[256];
char* (*func)( irc_t *, char * );
if( argc < 2 )
{
fprintf( stderr, "Usage: %s <password>\n\n"
"Reads from stdin, writes to stdout.\n"
"Call as \"encode\" to encode, \"decode\" to decode.\n", argv[0] );
return( 1 );
}
memset( irc, 0, sizeof( irc_t ) );
irc->password = g_strdup( argv[1] );
hash = hashpass( irc );
action = argv[0] + strlen( argv[0] ) - strlen( "encode" );
if( strcmp( action, "encode" ) == 0 )
{
fwrite( hash, 32, 1, stdout );
func = obfucrypt;
}
else if( strcmp( action, "decode" ) == 0 )
{
char hash2[32];
fread( hash2, 32, 1, stdin );
if( memcmp( hash, hash2, 32 ) != 0 )
{
fprintf( stderr, "Passwords don't match. Can't decode.\n" );
return( 1 );
}
func = deobfucrypt;
}
else
{
return( main( 0, NULL ) );
}
while( fscanf( stdin, "%[^\n]255s", line ) > 0 )
{
char *out;
/* Flush the newline */
fgetc( stdin );
out = func( irc, line );
printf( "%s\n", out );
g_free( out );
}
return( 0 );
}
#endif
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