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/*
* $Id: uams_dhx_passwd.c,v 1.18.6.6 2004/03/18 02:56:32 bfernhomberg Exp $
*
* Copyright (c) 1990,1993 Regents of The University of Michigan.
* Copyright (c) 1999 Adrian Sun (asun@u.washington.edu)
* All Rights Reserved. See COPYRIGHT.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#ifdef NETBSD
#define _XOPEN_SOURCE 500 /* for crypt() */
#endif
#ifdef FREEBSD
#define _XOPEN_SOURCE /* for crypt() */
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#ifdef HAVE_CRYPT_H
#include <crypt.h>
#endif /* ! HAVE_CRYPT_H */
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_TIME_H
#include <time.h>
#endif
#include <pwd.h>
#ifdef SHADOWPW
#include <shadow.h>
#endif /* SHADOWPW */
#if defined(GNUTLS_DHX)
#include <gnutls/openssl.h>
#elif defined(OPENSSL_DHX)
#include <openssl/bn.h>
#include <openssl/dh.h>
#include <openssl/cast.h>
#else /* OPENSSL_DHX */
#include <bn.h>
#include <dh.h>
#include <cast.h>
#endif /* OPENSSL_DHX */
#include <atalk/logger.h>
#include <atalk/afp.h>
#include <atalk/uam.h>
#define KEYSIZE 16
#define PASSWDLEN 64
#define CRYPTBUFLEN (KEYSIZE*2)
#define CRYPT2BUFLEN (KEYSIZE + PASSWDLEN)
/* hash a number to a 16-bit quantity */
#define dhxhash(a) ((((unsigned long) (a) >> 8) ^ \
(unsigned long) (a)) & 0xffff)
/* the secret key */
static CAST_KEY castkey;
static struct passwd *dhxpwd;
static u_int8_t randbuf[16];
#ifdef TRU64
#include <sia.h>
#include <siad.h>
static char *clientname;
#endif /* TRU64 */
/* dhx passwd */
static int pwd_login(void *obj, char *username, int ulen, struct passwd **uam_pwd,
char *ibuf, int ibuflen,
char *rbuf, int *rbuflen)
{
unsigned char iv[] = "CJalbert";
u_int8_t p[] = {0xBA, 0x28, 0x73, 0xDF, 0xB0, 0x60, 0x57, 0xD4,
0x3F, 0x20, 0x24, 0x74, 0x4C, 0xEE, 0xE7, 0x5B };
u_int8_t g = 0x07;
#ifdef SHADOWPW
struct spwd *sp;
#endif /* SHADOWPW */
BIGNUM *bn, *gbn, *pbn;
u_int16_t sessid;
int i;
DH *dh;
#ifdef TRU64
int rnd_seed[256];
for (i = 0; i < 256; i++)
rnd_seed[i] = random();
RAND_seed(rnd_seed, sizeof(rnd_seed));
#endif /* TRU64 */
*rbuflen = 0;
#ifdef TRU64
if( uam_afpserver_option( obj, UAM_OPTION_CLIENTNAME,
(void *) &clientname, NULL ) < 0 )
return AFPERR_PARAM;
#endif /* TRU64 */
if (( dhxpwd = uam_getname(obj, username, ulen)) == NULL ) {
return AFPERR_PARAM;
}
LOG(log_info, logtype_uams, "dhx login: %s", username);
if (uam_checkuser(dhxpwd) < 0)
return AFPERR_NOTAUTH;
#ifdef SHADOWPW
if (( sp = getspnam( dhxpwd->pw_name )) == NULL ) {
LOG(log_info, logtype_uams, "no shadow passwd entry for %s", username);
return AFPERR_NOTAUTH;
}
dhxpwd->pw_passwd = sp->sp_pwdp;
#endif /* SHADOWPW */
if (!dhxpwd->pw_passwd)
return AFPERR_NOTAUTH;
/* get the client's public key */
if (!(bn = BN_bin2bn(ibuf, KEYSIZE, NULL))) {
return AFPERR_PARAM;
}
/* get our primes */
if (!(gbn = BN_bin2bn(&g, sizeof(g), NULL))) {
BN_free(bn);
return AFPERR_PARAM;
}
if (!(pbn = BN_bin2bn(p, sizeof(p), NULL))) {
BN_free(gbn);
BN_free(bn);
return AFPERR_PARAM;
}
/* okay, we're ready */
if (!(dh = DH_new())) {
BN_free(pbn);
BN_free(gbn);
BN_free(bn);
return AFPERR_PARAM;
}
/* generate key and make sure we have enough space */
dh->p = pbn;
dh->g = gbn;
if (!DH_generate_key(dh) || (BN_num_bytes(dh->pub_key) > KEYSIZE)) {
goto passwd_fail;
}
/* figure out the key. use rbuf as a temporary buffer. */
i = DH_compute_key(rbuf, bn, dh);
/* set the key */
CAST_set_key(&castkey, i, rbuf);
/* session id. it's just a hashed version of the object pointer. */
sessid = dhxhash(obj);
memcpy(rbuf, &sessid, sizeof(sessid));
rbuf += sizeof(sessid);
*rbuflen += sizeof(sessid);
/* send our public key */
BN_bn2bin(dh->pub_key, rbuf);
rbuf += KEYSIZE;
*rbuflen += KEYSIZE;
/* buffer to be encrypted */
i = sizeof(randbuf);
if (uam_afpserver_option(obj, UAM_OPTION_RANDNUM, (void *) randbuf,
&i) < 0) {
*rbuflen = 0;
goto passwd_fail;
}
memcpy(rbuf, &randbuf, sizeof(randbuf));
#if 0
/* get the signature. it's always 16 bytes. */
if (uam_afpserver_option(obj, UAM_OPTION_SIGNATURE,
(void *) &name, NULL) < 0) {
*rbuflen = 0;
goto passwd_fail;
}
memcpy(rbuf + KEYSIZE, name, KEYSIZE);
#else /* 0 */
memset(rbuf + KEYSIZE, 0, KEYSIZE);
#endif /* 0 */
/* encrypt using cast */
CAST_cbc_encrypt(rbuf, rbuf, CRYPTBUFLEN, &castkey, iv, CAST_ENCRYPT);
*rbuflen += CRYPTBUFLEN;
BN_free(bn);
DH_free(dh);
return AFPERR_AUTHCONT;
passwd_fail:
BN_free(bn);
DH_free(dh);
return AFPERR_PARAM;
}
/* cleartxt login */
static int passwd_login(void *obj, struct passwd **uam_pwd,
char *ibuf, int ibuflen,
char *rbuf, int *rbuflen)
{
char *username;
int len, ulen;
*rbuflen = 0;
if (uam_afpserver_option(obj, UAM_OPTION_USERNAME,
(void *) &username, &ulen) < 0)
return AFPERR_MISC;
if (ibuflen <= 1) {
return( AFPERR_PARAM );
}
len = (unsigned char) *ibuf++;
ibuflen--;
if (!len || len > ibuflen || len > ulen ) {
return( AFPERR_PARAM );
}
memcpy(username, ibuf, len );
ibuf += len;
ibuflen -=len;
username[ len ] = '\0';
if ((unsigned long) ibuf & 1) { /* pad character */
++ibuf;
ibuflen--;
}
return (pwd_login(obj, username, ulen, uam_pwd, ibuf, ibuflen, rbuf, rbuflen));
}
/* cleartxt login ext
* uname format :
byte 3
2 bytes len (network order)
len bytes utf8 name
*/
static int passwd_login_ext(void *obj, char *uname, struct passwd **uam_pwd,
char *ibuf, int ibuflen,
char *rbuf, int *rbuflen)
{
char *username;
int len, ulen;
u_int16_t temp16;
*rbuflen = 0;
if (uam_afpserver_option(obj, UAM_OPTION_USERNAME,
(void *) &username, &ulen) < 0)
return AFPERR_MISC;
if (*uname != 3)
return AFPERR_PARAM;
uname++;
memcpy(&temp16, uname, sizeof(temp16));
len = ntohs(temp16);
if (!len || len > ulen ) {
return( AFPERR_PARAM );
}
memcpy(username, uname +2, len );
username[ len ] = '\0';
return (pwd_login(obj, username, ulen, uam_pwd, ibuf, ibuflen, rbuf, rbuflen));
}
static int passwd_logincont(void *obj, struct passwd **uam_pwd,
char *ibuf, int ibuflen,
char *rbuf, int *rbuflen)
{
#ifdef SHADOWPW
struct spwd *sp;
#endif /* SHADOWPW */
unsigned char iv[] = "LWallace";
BIGNUM *bn1, *bn2, *bn3;
u_int16_t sessid;
char *p;
int err = AFPERR_NOTAUTH;
*rbuflen = 0;
/* check for session id */
memcpy(&sessid, ibuf, sizeof(sessid));
if (sessid != dhxhash(obj))
return AFPERR_PARAM;
ibuf += sizeof(sessid);
/* use rbuf as scratch space */
CAST_cbc_encrypt(ibuf, rbuf, CRYPT2BUFLEN, &castkey,
iv, CAST_DECRYPT);
/* check to make sure that the random number is the same. we
* get sent back an incremented random number. */
if (!(bn1 = BN_bin2bn(rbuf, KEYSIZE, NULL)))
return AFPERR_PARAM;
if (!(bn2 = BN_bin2bn(randbuf, sizeof(randbuf), NULL))) {
BN_free(bn1);
return AFPERR_PARAM;
}
/* zero out the random number */
memset(rbuf, 0, sizeof(randbuf));
memset(randbuf, 0, sizeof(randbuf));
rbuf += KEYSIZE;
if (!(bn3 = BN_new())) {
BN_free(bn2);
BN_free(bn1);
return AFPERR_PARAM;
}
BN_sub(bn3, bn1, bn2);
BN_free(bn2);
BN_free(bn1);
/* okay. is it one more? */
if (!BN_is_one(bn3)) {
BN_free(bn3);
return AFPERR_PARAM;
}
BN_free(bn3);
rbuf[PASSWDLEN] = '\0';
#ifdef TRU64
{
int ac;
char **av;
char hostname[256];
uam_afp_getcmdline( &ac, &av );
sprintf( hostname, "%s@%s", dhxpwd->pw_name, clientname );
if( uam_sia_validate_user( NULL, ac, av, hostname, dhxpwd->pw_name,
NULL, FALSE, NULL, rbuf ) != SIASUCCESS )
return AFPERR_NOTAUTH;
memset( rbuf, 0, PASSWDLEN );
*uam_pwd = dhxpwd;
return AFP_OK;
}
#else /* TRU64 */
p = crypt( rbuf, dhxpwd->pw_passwd );
memset(rbuf, 0, PASSWDLEN);
if ( strcmp( p, dhxpwd->pw_passwd ) == 0 ) {
*uam_pwd = dhxpwd;
err = AFP_OK;
}
#ifdef SHADOWPW
if (( sp = getspnam( dhxpwd->pw_name )) == NULL ) {
LOG(log_info, logtype_uams, "no shadow passwd entry for %s", dhxpwd->pw_name);
return (AFPERR_NOTAUTH);
}
/* check for expired password */
if (sp && sp->sp_max != -1 && sp->sp_lstchg) {
time_t now = time(NULL) / (60*60*24);
int32_t expire_days = sp->sp_lstchg - now + sp->sp_max;
if ( expire_days < 0 ) {
LOG(log_info, logtype_uams, "password for user %s expired", dhxpwd->pw_name);
err = AFPERR_PWDEXPR;
}
}
#endif /* SHADOWPW */
return err;
#endif /* TRU64 */
return AFPERR_NOTAUTH;
}
static int uam_setup(const char *path)
{
if (uam_register(UAM_SERVER_LOGIN_EXT, path, "DHCAST128",
passwd_login, passwd_logincont, NULL, passwd_login_ext) < 0)
return -1;
/*uam_register(UAM_SERVER_PRINTAUTH, path, "DHCAST128",
passwd_printer);*/
return 0;
}
static void uam_cleanup(void)
{
uam_unregister(UAM_SERVER_LOGIN, "DHCAST128");
/*uam_unregister(UAM_SERVER_PRINTAUTH, "DHCAST128"); */
}
UAM_MODULE_EXPORT struct uam_export uams_dhx = {
UAM_MODULE_SERVER,
UAM_MODULE_VERSION,
uam_setup, uam_cleanup
};
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