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/*
* Copyright (c) 1997-1999 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "kadm5_locl.h"
RCSID("$Id: password_quality.c,v 1.4 2000/07/05 13:14:45 joda Exp $");
#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#endif
static const char *
simple_passwd_quality (krb5_context context,
krb5_principal principal,
krb5_data *pwd)
{
if (pwd->length < 6)
return "Password too short";
else
return NULL;
}
typedef const char* (*passwd_quality_check_func)(krb5_context,
krb5_principal,
krb5_data*);
static passwd_quality_check_func passwd_quality_check = simple_passwd_quality;
#ifdef HAVE_DLOPEN
#define PASSWD_VERSION 0
#endif
/*
* setup the password quality hook
*/
void
kadm5_setup_passwd_quality_check(krb5_context context,
const char *check_library,
const char *check_function)
{
#ifdef HAVE_DLOPEN
void *handle;
void *sym;
int *version;
int flags;
const char *tmp;
#ifdef RTLD_NOW
flags = RTLD_NOW;
#else
flags = 0;
#endif
if(check_library == NULL) {
tmp = krb5_config_get_string(context, NULL,
"password_quality",
"check_library",
NULL);
if(tmp != NULL)
check_library = tmp;
}
if(check_function == NULL) {
tmp = krb5_config_get_string(context, NULL,
"password_quality",
"check_function",
NULL);
if(tmp != NULL)
check_function = tmp;
}
if(check_library != NULL && check_function == NULL)
check_function = "passwd_check";
if(check_library == NULL)
return;
handle = dlopen(check_library, flags);
if(handle == NULL) {
krb5_warnx(context, "failed to open `%s'", check_library);
return;
}
version = dlsym(handle, "version");
if(version == NULL) {
krb5_warnx(context,
"didn't find `version' symbol in `%s'", check_library);
dlclose(handle);
return;
}
if(*version != PASSWD_VERSION) {
krb5_warnx(context,
"version of loaded library is %d (expected %d)",
*version, PASSWD_VERSION);
dlclose(handle);
return;
}
sym = dlsym(handle, check_function);
if(sym == NULL) {
krb5_warnx(context,
"didn't find `%s' symbol in `%s'",
check_function, check_library);
dlclose(handle);
return;
}
passwd_quality_check = (passwd_quality_check_func) sym;
#endif /* HAVE_DLOPEN */
}
const char *
kadm5_check_password_quality (krb5_context context,
krb5_principal principal,
krb5_data *pwd_data)
{
return (*passwd_quality_check) (context, principal, pwd_data);
}
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