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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/* password checking routines */
/*****************************************************************************
The main idea is that no password are sent between client & server on
connection and that no password are saved in mysql in a decodable form.
On connection a random string is generated and sent to the client.
The client generates a new string with a random generator inited with
the hash values from the password and the sent string.
This 'check' string is sent to the server where it is compared with
a string generated from the stored hash_value of the password and the
random string.
The password is saved (in user.password) by using the PASSWORD() function in
mysql.
Example:
update user set password=PASSWORD("hello") where user="test"
This saves a hashed number as a string in the password field.
*****************************************************************************/
#include <global.h>
#include <my_sys.h>
#include <m_string.h>
#include "mysql.h"
void randominit(struct rand_struct *rand_st,ulong seed1, ulong seed2)
{ /* For mysql 3.21.# */
#ifdef HAVE_purify
bzero((char*) rand_st,sizeof(*rand_st)); /* Avoid UMC varnings */
#endif
rand_st->max_value= 0x3FFFFFFFL;
rand_st->max_value_dbl=(double) rand_st->max_value;
rand_st->seed1=seed1%rand_st->max_value ;
rand_st->seed2=seed2%rand_st->max_value;
}
static void old_randominit(struct rand_struct *rand_st,ulong seed1)
{ /* For mysql 3.20.# */
rand_st->max_value= 0x01FFFFFFL;
rand_st->max_value_dbl=(double) rand_st->max_value;
seed1%=rand_st->max_value;
rand_st->seed1=seed1 ; rand_st->seed2=seed1/2;
}
double rnd(struct rand_struct *rand_st)
{
rand_st->seed1=(rand_st->seed1*3+rand_st->seed2) % rand_st->max_value;
rand_st->seed2=(rand_st->seed1+rand_st->seed2+33) % rand_st->max_value;
return (((double) rand_st->seed1)/rand_st->max_value_dbl);
}
void hash_password(ulong *result, const char *password)
{
register ulong nr=1345345333L, add=7, nr2=0x12345671L;
ulong tmp;
for (; *password ; password++)
{
if (*password == ' ' || *password == '\t')
continue; /* skipp space in password */
tmp= (ulong) (uchar) *password;
nr^= (((nr & 63)+add)*tmp)+ (nr << 8);
nr2+=(nr2 << 8) ^ nr;
add+=tmp;
}
result[0]=nr & (((ulong) 1L << 31) -1L); /* Don't use sign bit (str2int) */;
result[1]=nr2 & (((ulong) 1L << 31) -1L);
return;
}
void make_scrambled_password(char *to,const char *password)
{
ulong hash_res[2];
hash_password(hash_res,password);
sprintf(to,"%08lx%08lx",hash_res[0],hash_res[1]);
}
static inline uint char_val(char X)
{
return (uint) (X >= '0' && X <= '9' ? X-'0' :
X >= 'A' && X <= 'Z' ? X-'A'+10 :
X-'a'+10);
}
/*
** This code assumes that len(password) is divideable with 8 and that
** res is big enough (2 in mysql)
*/
void get_salt_from_password(ulong *res,const char *password)
{
res[0]=res[1]=0;
if (password)
{
while (*password)
{
ulong val=0;
uint i;
for (i=0 ; i < 8 ; i++)
val=(val << 4)+char_val(*password++);
*res++=val;
}
}
return;
}
void make_password_from_salt(char *to, ulong *hash_res)
{
sprintf(to,"%08lx%08lx",hash_res[0],hash_res[1]);
}
/*
* Genererate a new message based on message and password
* The same thing is done in client and server and the results are checked.
*/
char *scramble(char *to,const char *message,const char *password,
my_bool old_ver)
{
struct rand_struct rand_st;
ulong hash_pass[2],hash_message[2];
if (password && password[0])
{
char *to_start=to;
hash_password(hash_pass,password);
hash_password(hash_message,message);
if (old_ver)
old_randominit(&rand_st,hash_pass[0] ^ hash_message[0]);
else
randominit(&rand_st,hash_pass[0] ^ hash_message[0],
hash_pass[1] ^ hash_message[1]);
while (*message++)
*to++= (char) (floor(rnd(&rand_st)*31)+64);
if (!old_ver)
{ /* Make it harder to break */
char extra=(char) (floor(rnd(&rand_st)*31));
while (to_start != to)
*(to_start++)^=extra;
}
}
*to=0;
return to;
}
my_bool check_scramble(const char *scrambled, const char *message,
ulong *hash_pass, my_bool old_ver)
{
struct rand_struct rand_st;
ulong hash_message[2];
char buff[16],*to,extra; /* Big enough for check */
const char *pos;
hash_password(hash_message,message);
if (old_ver)
old_randominit(&rand_st,hash_pass[0] ^ hash_message[0]);
else
randominit(&rand_st,hash_pass[0] ^ hash_message[0],
hash_pass[1] ^ hash_message[1]);
to=buff;
for (pos=scrambled ; *pos ; pos++)
*to++=(char) (floor(rnd(&rand_st)*31)+64);
if (old_ver)
extra=0;
else
extra=(char) (floor(rnd(&rand_st)*31));
to=buff;
while (*scrambled)
{
if (*scrambled++ != (char) (*to++ ^ extra))
return 1; /* Wrong password */
}
return 0;
}
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