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pjs/directory/ds-plugins/rex_filt.c

301 строка
8.2 KiB
C
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/* -*- Mode: C; eval: (c-set-style "GNU") -*-
******************************************************************************
* $Id: rex_filt.c,v 1.5 2005-12-13 13:25:32 gerv%gerv.net Exp $
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Netscape DS Plugins.
*
* The Initial Developer of the Original Code is Leif Hedstrom and Netscape
* Communications Corp.
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*****************************************************************************
* DESCRIPTION:
* Apply regular expressions to MOD/ADD operations, if the rule is a match
* deny/allow the modification. You can use this plugin any number of times
* from the slapd.conf file, it will extend the filter rules accordingly.
*
* USAGE:
* plugin preoperation rex_filt.so rexPlugInit attr1,2 0/1 regexp1
* plugin preoperation rex_filt.so rexPlugInit attr3,4 0/1 regexp2
*
* TODO:
* * Support the /.../i syntax, for case insensitive regexps.
*
*****************************************************************************/
#include <stdio.h>
#include <regex.h>
#include "lulu.h"
/******************************************************************************
* Defines, for this particular plugin only.
*/
#define PLUGIN_NAME "rex_filter"
#define PLUGIN_VERS "1.1"
#define ERR_NOMATCH "An attribute does not match a server regex rule.\n"
#define ERR_MATCH "An attribute matches a server regex rule.\n"
/******************************************************************************
* Typedefs and structures. Note that some of the members of this structure
* are for performance reason, e.g. the "len" fields.
*/
typedef struct _Rex_Filter
{
char *string;
char *attributes;
regex_t *regex;
int match;
Plugin_Attrs *attrs;
struct _Rex_Filter *next;
} Rex_Filter;
/******************************************************************************
* Globals, "private" to this module.
*/
static int rex_num_filters = 0;
static Rex_Filter *rex_filter_list = NULL;
static Slapi_PluginDesc rex_descript = { PLUGIN_NAME,
"Leif Hedstrom",
PLUGIN_VERS,
"Regex filter plugin" };
static int
create_filter(Rex_Filter *filter, char *attributes, char *string)
{
if (!filter || filter->attrs || !attributes || !string)
return 0;
if (!(filter->string = slapi_ch_strdup(string)))
return 0;
if (!(filter->attributes = slapi_ch_strdup(attributes)))
{
slapi_ch_free((void **)&(filter->attributes));
return 0;
}
if (!(filter->attrs = parse_attributes(filter->attributes)))
{
slapi_ch_free((void **)&(filter->string));
slapi_ch_free((void **)&(filter->attributes));
return 0;
}
if (regcomp(filter->regex, filter->string, REG_EXTENDED|REG_NOSUB))
{
slapi_ch_free((void **)&(filter->attributes));
slapi_ch_free((void **)&(filter->string));
free_attributes(filter->attrs);
return 0;
}
return 1;
}
static INLINE int
loop_ber_values(Slapi_PBlock *pb, Rex_Filter *filter, BerVal **bvals,
char *type)
{
int res;
while (*bvals)
{
res = regexec(filter->regex, (*bvals)->bv_val, (size_t) 0, NULL, 0);
if ((!res && !filter->match) || (res && filter->match))
{
slapi_log_error(LOG_FACILITY, PLUGIN_NAME,
"Violation: %s /%s/ on '%s: %s'\n",
filter->match ? "require" : "refuse",
filter->string, type, (*bvals)->bv_val);
slapi_send_ldap_result(pb, LDAP_CONSTRAINT_VIOLATION, NULL,
filter->match ? ERR_NOMATCH : ERR_MATCH, 0,
(BerVal **)NULL);
return 1;
}
bvals++;
}
return 0;
}
int
eval_add_filter(Slapi_PBlock *pb)
{
Rex_Filter *filter;
Plugin_Attrs *attrs;
Slapi_Entry *entry;
Slapi_Attr *att;
BerVal **bvals;
if (!entry)
return 0;
if (slapi_pblock_get(pb, SLAPI_ADD_ENTRY, &entry) || !entry)
{
slapi_log_error(LOG_FACILITY, PLUGIN_NAME, ERR_NOENTRY);
slapi_send_ldap_result(pb, LDAP_NO_MEMORY, NULL, ERR_NOENTRY, 0,
(BerVal **)NULL);
return (-1);
}
filter = rex_filter_list;
while (filter)
{
attrs = filter->attrs;
while (attrs)
{
if (!slapi_entry_attr_find(entry, attrs->type, &att))
{
slapi_attr_get_values(att, &bvals);
if (loop_ber_values(pb, filter, bvals, attrs->type))
return (-1);
}
attrs = attrs->next;
}
filter = filter->next;
}
return 0;
}
int
eval_mod_filter(Slapi_PBlock *pb)
{
Rex_Filter *filter;
LDAPMod **mods, *mod;
if (!mods)
return 0;
if (slapi_pblock_get(pb, SLAPI_MODIFY_MODS, &mods) || !mods)
{
slapi_log_error(LOG_FACILITY, PLUGIN_NAME, ERR_NOMODS);
slapi_send_ldap_result(pb, LDAP_NO_MEMORY, NULL, ERR_NOMODS, 0,
(BerVal **)NULL);
return (-1);
}
while ((mod = *mods))
{
if (!(mod->mod_op & LDAP_MOD_DELETE))
{
filter = rex_filter_list;
while (filter)
{
if (list_has_attribute(filter->attrs, mod->mod_type) &&
loop_ber_values(pb, filter, mod->mod_bvalues,
mod->mod_type))
return (-1);
filter = filter->next;
}
}
mods++;
}
return 0;
}
int
rex_filter_init(Slapi_PBlock *pb)
{
char **argv;
int argc;
Rex_Filter *new, *last;
if (slapi_pblock_get(pb, SLAPI_PLUGIN_ARGC, &argc) ||
slapi_pblock_get(pb, SLAPI_PLUGIN_ARGV, &argv) || (argc < 3) || !argv)
{
slapi_log_error(LOG_FACILITY, PLUGIN_NAME,
"Can't locate plugin arguments, please panic!\n");
return (-1);
}
if (!(new = (Rex_Filter *)slapi_ch_malloc(sizeof(Rex_Filter))))
{
slapi_log_error(LOG_FACILITY, PLUGIN_NAME, ERR_MALLOC);
return (-1);
}
if (!(new->regex = (regex_t *)slapi_ch_malloc(sizeof(regex_t))))
{
slapi_log_error(LOG_FACILITY, PLUGIN_NAME, ERR_MALLOC);
return (-1);
}
new->next = (Rex_Filter *)NULL;
new->attrs = (Plugin_Attrs *)NULL;
new->match = (*(argv[1]) == '0' ? 0 : 1);
if (!create_filter(new, argv[0], argv[2]) || !new->attrs)
{
slapi_ch_free((void **)&(new->regex));
slapi_ch_free((void **)&new);
slapi_log_error(LOG_FACILITY, PLUGIN_NAME,
"Can't make filter out of plugin arguments.\n");
return (-1);
}
if ((last = rex_filter_list))
{
while (last && last->next)
last = last->next;
last->next = new;
}
else
rex_filter_list = new;
if (rex_num_filters++)
return 0;
if (slapi_pblock_set(pb, SLAPI_PLUGIN_VERSION, SLAPI_PLUGIN_VERSION_01) ||
slapi_pblock_set(pb, SLAPI_PLUGIN_DESCRIPTION, (void *)&rex_descript) ||
slapi_pblock_set(pb, SLAPI_PLUGIN_PRE_MODIFY_FN,
(void *)&eval_mod_filter)
|| slapi_pblock_set(pb, SLAPI_PLUGIN_PRE_ADD_FN,
(void *)&eval_add_filter))
{
slapi_log_error(LOG_FACILITY, PLUGIN_NAME,
"Error registering plugin functions.\n");
return (-1);
}
slapi_log_error(LOG_FACILITY, PLUGIN_NAME,
"plugin loaded\n");
return 0;
}
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