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/*
ldb database library
Copyright (C) Andrew Tridgell 2004-2005
Copyright (C) Simo Sorce 2005
** NOTE! The following LGPL license applies to the ldb
** library. This does NOT imply that all of Samba is released
** under the LGPL
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
/*
* Name: ldb
*
* Component: ldb expression matching
*
* Description: ldb expression matching
*
* Author: Andrew Tridgell
*/
#include "ldb_private.h"
#include "dlinklist.h"
/*
check if the scope matches in a search result
*/
static int ldb_match_scope(struct ldb_context *ldb,
struct ldb_dn *base,
struct ldb_dn *dn,
enum ldb_scope scope)
{
int ret = 0;
if (base == NULL || dn == NULL) {
return 1;
}
switch (scope) {
case LDB_SCOPE_BASE:
if (ldb_dn_compare(base, dn) == 0) {
ret = 1;
}
break;
case LDB_SCOPE_ONELEVEL:
if (ldb_dn_get_comp_num(dn) == (ldb_dn_get_comp_num(base) + 1)) {
if (ldb_dn_compare_base(base, dn) == 0) {
ret = 1;
}
}
break;
case LDB_SCOPE_SUBTREE:
default:
if (ldb_dn_compare_base(base, dn) == 0) {
ret = 1;
}
break;
}
return ret;
}
/*
match if node is present
*/
static int ldb_match_present(struct ldb_context *ldb,
const struct ldb_message *msg,
const struct ldb_parse_tree *tree,
enum ldb_scope scope, bool *matched)
{
const struct ldb_schema_attribute *a;
struct ldb_message_element *el;
if (ldb_attr_dn(tree->u.present.attr) == 0) {
*matched = true;
return LDB_SUCCESS;
}
el = ldb_msg_find_element(msg, tree->u.present.attr);
if (el == NULL) {
*matched = false;
return LDB_SUCCESS;
}
a = ldb_schema_attribute_by_name(ldb, el->name);
if (!a) {
return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
}
if (a->syntax->operator_fn) {
unsigned int i;
for (i = 0; i < el->num_values; i++) {
int ret = a->syntax->operator_fn(ldb, LDB_OP_PRESENT, a, &el->values[i], NULL, matched);
if (ret != LDB_SUCCESS) return ret;
if (*matched) return LDB_SUCCESS;
}
*matched = false;
return LDB_SUCCESS;
}
*matched = true;
return LDB_SUCCESS;
}
static int ldb_match_comparison(struct ldb_context *ldb,
const struct ldb_message *msg,
const struct ldb_parse_tree *tree,
enum ldb_scope scope,
enum ldb_parse_op comp_op, bool *matched)
{
unsigned int i;
struct ldb_message_element *el;
const struct ldb_schema_attribute *a;
/* FIXME: APPROX comparison not handled yet */
if (comp_op == LDB_OP_APPROX) {
return LDB_ERR_INAPPROPRIATE_MATCHING;
}
el = ldb_msg_find_element(msg, tree->u.comparison.attr);
if (el == NULL) {
*matched = false;
return LDB_SUCCESS;
}
a = ldb_schema_attribute_by_name(ldb, el->name);
if (!a) {
return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
}
for (i = 0; i < el->num_values; i++) {
if (a->syntax->operator_fn) {
int ret;
ret = a->syntax->operator_fn(ldb, comp_op, a, &el->values[i], &tree->u.comparison.value, matched);
if (ret != LDB_SUCCESS) return ret;
if (*matched) return LDB_SUCCESS;
} else {
int ret = a->syntax->comparison_fn(ldb, ldb, &el->values[i], &tree->u.comparison.value);
if (ret == 0) {
*matched = true;
return LDB_SUCCESS;
}
if (ret > 0 && comp_op == LDB_OP_GREATER) {
*matched = true;
return LDB_SUCCESS;
}
if (ret < 0 && comp_op == LDB_OP_LESS) {
*matched = true;
return LDB_SUCCESS;
}
}
}
*matched = false;
return LDB_SUCCESS;
}
/*
match a simple leaf node
*/
static int ldb_match_equality(struct ldb_context *ldb,
const struct ldb_message *msg,
const struct ldb_parse_tree *tree,
enum ldb_scope scope,
bool *matched)
{
unsigned int i;
struct ldb_message_element *el;
const struct ldb_schema_attribute *a;
struct ldb_dn *valuedn;
int ret;
if (ldb_attr_dn(tree->u.equality.attr) == 0) {
valuedn = ldb_dn_from_ldb_val(ldb, ldb, &tree->u.equality.value);
if (valuedn == NULL) {
return LDB_ERR_INVALID_DN_SYNTAX;
}
ret = ldb_dn_compare(msg->dn, valuedn);
talloc_free(valuedn);
*matched = (ret == 0);
return LDB_SUCCESS;
}
/* TODO: handle the "*" case derived from an extended search
operation without the attibute type defined */
el = ldb_msg_find_element(msg, tree->u.equality.attr);
if (el == NULL) {
*matched = false;
return LDB_SUCCESS;
}
a = ldb_schema_attribute_by_name(ldb, el->name);
if (a == NULL) {
return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
}
for (i=0;i<el->num_values;i++) {
if (a->syntax->operator_fn) {
ret = a->syntax->operator_fn(ldb, LDB_OP_EQUALITY, a,
&tree->u.equality.value, &el->values[i], matched);
if (ret != LDB_SUCCESS) return ret;
if (*matched) return LDB_SUCCESS;
} else {
if (a->syntax->comparison_fn(ldb, ldb, &tree->u.equality.value,
&el->values[i]) == 0) {
*matched = true;
return LDB_SUCCESS;
}
}
}
*matched = false;
return LDB_SUCCESS;
}
static int ldb_wildcard_compare(struct ldb_context *ldb,
const struct ldb_parse_tree *tree,
const struct ldb_val value, bool *matched)
{
const struct ldb_schema_attribute *a;
struct ldb_val val;
struct ldb_val cnk;
struct ldb_val *chunk;
uint8_t *save_p = NULL;
unsigned int c = 0;
if (tree->operation != LDB_OP_SUBSTRING) {
*matched = false;
return LDB_ERR_INAPPROPRIATE_MATCHING;
}
a = ldb_schema_attribute_by_name(ldb, tree->u.substring.attr);
if (!a) {
return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
}
if (tree->u.substring.chunks == NULL) {
*matched = false;
return LDB_SUCCESS;
}
if (a->syntax->canonicalise_fn(ldb, ldb, &value, &val) != 0) {
return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
}
save_p = val.data;
cnk.data = NULL;
if ( ! tree->u.substring.start_with_wildcard ) {
chunk = tree->u.substring.chunks[c];
if (a->syntax->canonicalise_fn(ldb, ldb, chunk, &cnk) != 0) goto mismatch;
/* This deals with wildcard prefix searches on binary attributes (eg objectGUID) */
if (cnk.length > val.length) {
goto mismatch;
}
/*
* Empty strings are returned as length 0. Ensure
* we can cope with this.
*/
if (cnk.length == 0) {
goto mismatch;
}
if (memcmp((char *)val.data, (char *)cnk.data, cnk.length) != 0) goto mismatch;
val.length -= cnk.length;
val.data += cnk.length;
c++;
talloc_free(cnk.data);
cnk.data = NULL;
}
while (tree->u.substring.chunks[c]) {
uint8_t *p;
chunk = tree->u.substring.chunks[c];
if(a->syntax->canonicalise_fn(ldb, ldb, chunk, &cnk) != 0) goto mismatch;
/*
* Empty strings are returned as length 0. Ensure
* we can cope with this.
*/
if (cnk.length == 0) {
goto mismatch;
}
/*
* Values might be binary blobs. Don't use string
* search, but memory search instead.
*/
p = memmem((const void *)val.data,val.length,
(const void *)cnk.data, cnk.length);
if (p == NULL) goto mismatch;
/*
* At this point we know cnk.length <= val.length as
* otherwise there could be no match
*/
if ( (! tree->u.substring.chunks[c + 1]) && (! tree->u.substring.end_with_wildcard) ) {
uint8_t *g;
uint8_t *end = val.data + val.length;
do { /* greedy */
/*
* haystack is a valid pointer in val
* because the memmem() can only
* succeed if the needle (cnk.length)
* is <= haystacklen
*
* p will be a pointer at least
* cnk.length from the end of haystack
*/
uint8_t *haystack
= p + cnk.length;
size_t haystacklen
= end - (haystack);
g = memmem(haystack,
haystacklen,
(const uint8_t *)cnk.data,
cnk.length);
if (g) {
p = g;
}
} while(g);
}
val.length = val.length - (p - (uint8_t *)(val.data)) - cnk.length;
val.data = (uint8_t *)(p + cnk.length);
c++;
talloc_free(cnk.data);
cnk.data = NULL;
}
/* last chunk may not have reached end of string */
if ( (! tree->u.substring.end_with_wildcard) && (val.length != 0) ) goto mismatch;
talloc_free(save_p);
*matched = true;
return LDB_SUCCESS;
mismatch:
*matched = false;
talloc_free(save_p);
talloc_free(cnk.data);
return LDB_SUCCESS;
}
/*
match a simple leaf node
*/
static int ldb_match_substring(struct ldb_context *ldb,
const struct ldb_message *msg,
const struct ldb_parse_tree *tree,
enum ldb_scope scope, bool *matched)
{
unsigned int i;
struct ldb_message_element *el;
el = ldb_msg_find_element(msg, tree->u.substring.attr);
if (el == NULL) {
*matched = false;
return LDB_SUCCESS;
}
for (i = 0; i < el->num_values; i++) {
int ret;
ret = ldb_wildcard_compare(ldb, tree, el->values[i], matched);
if (ret != LDB_SUCCESS) return ret;
if (*matched) return LDB_SUCCESS;
}
*matched = false;
return LDB_SUCCESS;
}
/*
bitwise and/or comparator depending on oid
*/
static int ldb_comparator_bitmask(const char *oid, const struct ldb_val *v1, const struct ldb_val *v2,
bool *matched)
{
uint64_t i1, i2;
char ibuf[100];
char *endptr = NULL;
if (v1->length >= sizeof(ibuf)-1) {
return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
}
memcpy(ibuf, (char *)v1->data, v1->length);
ibuf[v1->length] = 0;
i1 = strtoull(ibuf, &endptr, 0);
if (endptr != NULL) {
if (endptr == ibuf || *endptr != 0) {
return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
}
}
if (v2->length >= sizeof(ibuf)-1) {
return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
}
endptr = NULL;
memcpy(ibuf, (char *)v2->data, v2->length);
ibuf[v2->length] = 0;
i2 = strtoull(ibuf, &endptr, 0);
if (endptr != NULL) {
if (endptr == ibuf || *endptr != 0) {
return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
}
}
if (strcmp(LDB_OID_COMPARATOR_AND, oid) == 0) {
*matched = ((i1 & i2) == i2);
} else if (strcmp(LDB_OID_COMPARATOR_OR, oid) == 0) {
*matched = ((i1 & i2) != 0);
} else {
return LDB_ERR_INAPPROPRIATE_MATCHING;
}
return LDB_SUCCESS;
}
static int ldb_match_bitmask(struct ldb_context *ldb,
const char *oid,
const struct ldb_message *msg,
const char *attribute_to_match,
const struct ldb_val *value_to_match,
bool *matched)
{
unsigned int i;
struct ldb_message_element *el;
/* find the message element */
el = ldb_msg_find_element(msg, attribute_to_match);
if (el == NULL) {
*matched = false;
return LDB_SUCCESS;
}
for (i=0;i<el->num_values;i++) {
int ret;
struct ldb_val *v = &el->values[i];
ret = ldb_comparator_bitmask(oid, v, value_to_match, matched);
if (ret != LDB_SUCCESS) {
return ret;
}
if (*matched) {
return LDB_SUCCESS;
}
}
*matched = false;
return LDB_SUCCESS;
}
/*
always return false
*/
static int ldb_comparator_false(struct ldb_context *ldb,
const char *oid,
const struct ldb_message *msg,
const char *attribute_to_match,
const struct ldb_val *value_to_match,
bool *matched)
{
*matched = false;
return LDB_SUCCESS;
}
static const struct ldb_extended_match_rule *ldb_find_extended_match_rule(struct ldb_context *ldb,
const char *oid)
{
struct ldb_extended_match_entry *extended_match_rule;
for (extended_match_rule = ldb->extended_match_rules;
extended_match_rule;
extended_match_rule = extended_match_rule->next) {
if (strcmp(extended_match_rule->rule->oid, oid) == 0) {
return extended_match_rule->rule;
}
}
return NULL;
}
/*
extended match, handles things like bitops
*/
static int ldb_match_extended(struct ldb_context *ldb,
const struct ldb_message *msg,
const struct ldb_parse_tree *tree,
enum ldb_scope scope, bool *matched)
{
const struct ldb_extended_match_rule *rule;
if (tree->u.extended.dnAttributes) {
/* FIXME: We really need to find out what this ":dn" part in
* an extended match means and how to handle it. For now print
* only a warning to have s3 winbind and other tools working
* against us. - Matthias */
ldb_debug(ldb, LDB_DEBUG_WARNING, "ldb: dnAttributes extended match not supported yet");
}
if (tree->u.extended.rule_id == NULL) {
ldb_debug(ldb, LDB_DEBUG_ERROR, "ldb: no-rule extended matches not supported yet");
return LDB_ERR_INAPPROPRIATE_MATCHING;
}
if (tree->u.extended.attr == NULL) {
ldb_debug(ldb, LDB_DEBUG_ERROR, "ldb: no-attribute extended matches not supported yet");
return LDB_ERR_INAPPROPRIATE_MATCHING;
}
rule = ldb_find_extended_match_rule(ldb, tree->u.extended.rule_id);
if (rule == NULL) {
*matched = false;
ldb_debug(ldb, LDB_DEBUG_ERROR, "ldb: unknown extended rule_id %s",
tree->u.extended.rule_id);
return LDB_SUCCESS;
}
return rule->callback(ldb, rule->oid, msg,
tree->u.extended.attr,
&tree->u.extended.value, matched);
}
/*
return 0 if the given parse tree matches the given message. Assumes
the message is in sorted order
return 1 if it matches, and 0 if it doesn't match
this is a recursive function, and does short-circuit evaluation
*/
static int ldb_match_message(struct ldb_context *ldb,
const struct ldb_message *msg,
const struct ldb_parse_tree *tree,
enum ldb_scope scope, bool *matched)
{
unsigned int i;
int ret;
*matched = false;
if (scope != LDB_SCOPE_BASE && ldb_dn_is_special(msg->dn)) {
/* don't match special records except on base searches */
return LDB_SUCCESS;
}
switch (tree->operation) {
case LDB_OP_AND:
for (i=0;i<tree->u.list.num_elements;i++) {
ret = ldb_match_message(ldb, msg, tree->u.list.elements[i], scope, matched);
if (ret != LDB_SUCCESS) return ret;
if (!*matched) return LDB_SUCCESS;
}
*matched = true;
return LDB_SUCCESS;
case LDB_OP_OR:
for (i=0;i<tree->u.list.num_elements;i++) {
ret = ldb_match_message(ldb, msg, tree->u.list.elements[i], scope, matched);
if (ret != LDB_SUCCESS) return ret;
if (*matched) return LDB_SUCCESS;
}
*matched = false;
return LDB_SUCCESS;
case LDB_OP_NOT:
ret = ldb_match_message(ldb, msg, tree->u.isnot.child, scope, matched);
if (ret != LDB_SUCCESS) return ret;
*matched = ! *matched;
return LDB_SUCCESS;
case LDB_OP_EQUALITY:
return ldb_match_equality(ldb, msg, tree, scope, matched);
case LDB_OP_SUBSTRING:
return ldb_match_substring(ldb, msg, tree, scope, matched);
case LDB_OP_GREATER:
return ldb_match_comparison(ldb, msg, tree, scope, LDB_OP_GREATER, matched);
case LDB_OP_LESS:
return ldb_match_comparison(ldb, msg, tree, scope, LDB_OP_LESS, matched);
case LDB_OP_PRESENT:
return ldb_match_present(ldb, msg, tree, scope, matched);
case LDB_OP_APPROX:
return ldb_match_comparison(ldb, msg, tree, scope, LDB_OP_APPROX, matched);
case LDB_OP_EXTENDED:
return ldb_match_extended(ldb, msg, tree, scope, matched);
}
return LDB_ERR_INAPPROPRIATE_MATCHING;
}
int ldb_match_msg(struct ldb_context *ldb,
const struct ldb_message *msg,
const struct ldb_parse_tree *tree,
struct ldb_dn *base,
enum ldb_scope scope)
{
bool matched;
int ret;
if ( ! ldb_match_scope(ldb, base, msg->dn, scope) ) {
return 0;
}
ret = ldb_match_message(ldb, msg, tree, scope, &matched);
if (ret != LDB_SUCCESS) {
/* to match the old API, we need to consider this a
failure to match */
return 0;
}
return matched?1:0;
}
int ldb_match_msg_error(struct ldb_context *ldb,
const struct ldb_message *msg,
const struct ldb_parse_tree *tree,
struct ldb_dn *base,
enum ldb_scope scope,
bool *matched)
{
if ( ! ldb_match_scope(ldb, base, msg->dn, scope) ) {
*matched = false;
return LDB_SUCCESS;
}
return ldb_match_message(ldb, msg, tree, scope, matched);
}
int ldb_match_msg_objectclass(const struct ldb_message *msg,
const char *objectclass)
{
unsigned int i;
struct ldb_message_element *el = ldb_msg_find_element(msg, "objectClass");
if (!el) {
return 0;
}
for (i=0; i < el->num_values; i++) {
if (ldb_attr_cmp((const char *)el->values[i].data, objectclass) == 0) {
return 1;
}
}
return 0;
}
_PRIVATE_ int ldb_register_extended_match_rules(struct ldb_context *ldb)
{
struct ldb_extended_match_rule *bitmask_and;
struct ldb_extended_match_rule *bitmask_or;
struct ldb_extended_match_rule *always_false;
int ret;
/* Register bitmask-and match */
bitmask_and = talloc_zero(ldb, struct ldb_extended_match_rule);
if (bitmask_and == NULL) {
return LDB_ERR_OPERATIONS_ERROR;
}
bitmask_and->oid = LDB_OID_COMPARATOR_AND;
bitmask_and->callback = ldb_match_bitmask;
ret = ldb_register_extended_match_rule(ldb, bitmask_and);
if (ret != LDB_SUCCESS) {
return ret;
}
/* Register bitmask-or match */
bitmask_or = talloc_zero(ldb, struct ldb_extended_match_rule);
if (bitmask_or == NULL) {
return LDB_ERR_OPERATIONS_ERROR;
}
bitmask_or->oid = LDB_OID_COMPARATOR_OR;
bitmask_or->callback = ldb_match_bitmask;
ret = ldb_register_extended_match_rule(ldb, bitmask_or);
if (ret != LDB_SUCCESS) {
return ret;
}
/* Register always-false match */
always_false = talloc_zero(ldb, struct ldb_extended_match_rule);
if (always_false == NULL) {
return LDB_ERR_OPERATIONS_ERROR;
}
always_false->oid = SAMBA_LDAP_MATCH_ALWAYS_FALSE;
always_false->callback = ldb_comparator_false;
ret = ldb_register_extended_match_rule(ldb, always_false);
if (ret != LDB_SUCCESS) {
return ret;
}
return LDB_SUCCESS;
}
/*
register a new ldb backend
if override is true, then override any existing backend for this prefix
*/
int ldb_register_extended_match_rule(struct ldb_context *ldb,
const struct ldb_extended_match_rule *rule)
{
const struct ldb_extended_match_rule *lookup_rule;
struct ldb_extended_match_entry *entry;
lookup_rule = ldb_find_extended_match_rule(ldb, rule->oid);
if (lookup_rule) {
return LDB_ERR_ENTRY_ALREADY_EXISTS;
}
entry = talloc_zero(ldb, struct ldb_extended_match_entry);
if (!entry) {
return LDB_ERR_OPERATIONS_ERROR;
}
entry->rule = rule;
DLIST_ADD_END(ldb->extended_match_rules, entry);
return LDB_SUCCESS;
}
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