/* -*- Mode: C; eval: (c-set-style "GNU") -*- ****************************************************************************** * $Id: rex_filt.c,v 1.3 2000-01-14 22:25:27 leif%netscape.com Exp $ * * 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 Netscape are Copyright (C) Netscape Communications * Corp. All Rights Reserved. * * Contributor(s): * * 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 #include #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; }