+++ /dev/null
-/*
- ldb database library
-
- Copyright (C) Andrew Tridgell 2004
-
- ** 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/>.
-*/
-
-#include "includes.h"
-#include "lib/ldb_compat.h"
-
-static struct ldb_parse_tree *ldb_parse_filter(void *mem_ctx, const char **s);
-
-static int ldb_parse_hex2char(const char *x)
-{
- if (isxdigit(x[0]) && isxdigit(x[1])) {
- const char h1 = x[0], h2 = x[1];
- int c = 0;
-
- if (h1 >= 'a') c = h1 - (int)'a' + 10;
- else if (h1 >= 'A') c = h1 - (int)'A' + 10;
- else if (h1 >= '0') c = h1 - (int)'0';
- c = c << 4;
- if (h2 >= 'a') c += h2 - (int)'a' + 10;
- else if (h2 >= 'A') c += h2 - (int)'A' + 10;
- else if (h2 >= '0') c += h2 - (int)'0';
-
- return c;
- }
-
- return -1;
-}
-
-
-
-/*
- decode a RFC2254 binary string representation of a buffer.
- Used in LDAP filters.
-*/
-static struct ldb_val ldb_binary_decode(void *mem_ctx, const char *str)
-{
- size_t i, j;
- struct ldb_val ret;
- size_t slen = str?strlen(str):0;
-
- ret.data = (uint8_t *)talloc_size(mem_ctx, slen+1);
- ret.length = 0;
- if (ret.data == NULL) return ret;
-
- for (i=j=0;i<slen;i++) {
- if (str[i] == '\\') {
- int c;
-
- c = ldb_parse_hex2char(&str[i+1]);
- if (c == -1) {
- talloc_free(ret.data);
- memset(&ret, 0, sizeof(ret));
- return ret;
- }
- ((uint8_t *)ret.data)[j++] = c;
- i += 2;
- } else {
- ((uint8_t *)ret.data)[j++] = str[i];
- }
- }
- ret.length = j;
- ((uint8_t *)ret.data)[j] = 0;
-
- return ret;
-}
-
-
-
-
-/*
- encode a blob as a RFC2254 binary string, escaping any
- non-printable or '\' characters
-*/
-char *ldb_binary_encode(void *mem_ctx, struct ldb_val val)
-{
- size_t i;
- char *ret;
- size_t len = val.length;
- unsigned char *buf = val.data;
-
- for (i=0;i<val.length;i++) {
- if (!isprint(buf[i]) || strchr(" *()\\&|!\"", buf[i])) {
- len += 2;
- }
- }
- ret = talloc_array(mem_ctx, char, len+1);
- if (ret == NULL) return NULL;
-
- len = 0;
- for (i=0;i<val.length;i++) {
- if (!isprint(buf[i]) || strchr(" *()\\&|!\"", buf[i])) {
- snprintf(ret+len, 4, "\\%02X", buf[i]);
- len += 3;
- } else {
- ret[len++] = buf[i];
- }
- }
-
- ret[len] = 0;
-
- return ret;
-}
-
-
-
-static enum ldb_parse_op ldb_parse_filtertype(void *mem_ctx, char **type, char **value, const char **s)
-{
- enum ldb_parse_op filter = 0;
- char *name, *val, *k;
- const char *p = *s;
- const char *t, *t1;
-
- /* retrieve attributetype name */
- t = p;
-
- if (*p == '@') { /* for internal attributes the first char can be @ */
- p++;
- }
-
- while ((isascii(*p) && isalnum((unsigned char)*p)) || (*p == '-') || (*p == '.')) {
- /* attribute names can only be alphanums */
- p++;
- }
-
- if (*p == ':') { /* but extended searches have : and . chars too */
- p = strstr(p, ":=");
- if (p == NULL) { /* malformed attribute name */
- return 0;
- }
- }
-
- t1 = p;
-
- while (isspace((unsigned char)*p)) p++;
-
- if (!strchr("=<>~:", *p)) {
- return 0;
- }
-
- /* save name */
- name = (char *)talloc_memdup(mem_ctx, t, t1 - t + 1);
- if (name == NULL) return 0;
- name[t1 - t] = '\0';
-
- /* retrieve filtertype */
-
- if (*p == '=') {
- filter = LDB_OP_EQUALITY;
- } else if (*(p + 1) == '=') {
- switch (*p) {
- case '<':
- filter = LDB_OP_LESS;
- p++;
- break;
- case '>':
- filter = LDB_OP_GREATER;
- p++;
- break;
- case '~':
- filter = LDB_OP_APPROX;
- p++;
- break;
- case ':':
- filter = LDB_OP_EXTENDED;
- p++;
- break;
- }
- }
- if (!filter) {
- talloc_free(name);
- return filter;
- }
- p++;
-
- while (isspace((unsigned char)*p)) p++;
-
- /* retrieve value */
- t = p;
-
- while (*p && ((*p != ')') || ((*p == ')') && (*(p - 1) == '\\')))) p++;
-
- val = (char *)talloc_memdup(mem_ctx, t, p - t + 1);
- if (val == NULL) {
- talloc_free(name);
- return 0;
- }
- val[p - t] = '\0';
-
- k = &(val[p - t]);
-
- /* remove trailing spaces from value */
- while ((k > val) && (isspace((unsigned char)*(k - 1)))) k--;
- *k = '\0';
-
- *type = name;
- *value = val;
- *s = p;
- return filter;
-}
-
-/* find the first matching wildcard */
-static char *ldb_parse_find_wildcard(char *value)
-{
- while (*value) {
- value = strpbrk(value, "\\*");
- if (value == NULL) return NULL;
-
- if (value[0] == '\\') {
- if (value[1] == '\0') return NULL;
- value += 2;
- continue;
- }
-
- if (value[0] == '*') return value;
- }
-
- return NULL;
-}
-
-/* return a NULL terminated list of binary strings representing the value
- chunks separated by wildcards that makes the value portion of the filter
-*/
-static struct ldb_val **ldb_wildcard_decode(void *mem_ctx, const char *string)
-{
- struct ldb_val **ret = NULL;
- unsigned int val = 0;
- char *wc, *str;
-
- wc = talloc_strdup(mem_ctx, string);
- if (wc == NULL) return NULL;
-
- while (wc && *wc) {
- str = wc;
- wc = ldb_parse_find_wildcard(str);
- if (wc && *wc) {
- if (wc == str) {
- wc++;
- continue;
- }
- *wc = 0;
- wc++;
- }
-
- ret = talloc_realloc(mem_ctx, ret, struct ldb_val *, val + 2);
- if (ret == NULL) return NULL;
-
- ret[val] = talloc(mem_ctx, struct ldb_val);
- if (ret[val] == NULL) return NULL;
-
- *(ret[val]) = ldb_binary_decode(mem_ctx, str);
- if ((ret[val])->data == NULL) return NULL;
-
- val++;
- }
-
- if (ret != NULL) {
- ret[val] = NULL;
- }
-
- return ret;
-}
-
-/*
- parse an extended match
-
- possible forms:
- (attr:oid:=value)
- (attr:dn:oid:=value)
- (attr:dn:=value)
- (:dn:oid:=value)
-
- the ':dn' part sets the dnAttributes boolean if present
- the oid sets the rule_id string
-
-*/
-static struct ldb_parse_tree *ldb_parse_extended(struct ldb_parse_tree *ret,
- char *attr, char *value)
-{
- char *p1, *p2;
-
- ret->operation = LDB_OP_EXTENDED;
- ret->u.extended.value = ldb_binary_decode(ret, value);
- if (ret->u.extended.value.data == NULL) goto failed;
-
- p1 = strchr(attr, ':');
- if (p1 == NULL) goto failed;
- p2 = strchr(p1+1, ':');
-
- *p1 = 0;
- if (p2) *p2 = 0;
-
- ret->u.extended.attr = attr;
- if (strcmp(p1+1, "dn") == 0) {
- ret->u.extended.dnAttributes = 1;
- if (p2) {
- ret->u.extended.rule_id = talloc_strdup(ret, p2+1);
- if (ret->u.extended.rule_id == NULL) goto failed;
- } else {
- ret->u.extended.rule_id = NULL;
- }
- } else {
- ret->u.extended.dnAttributes = 0;
- ret->u.extended.rule_id = talloc_strdup(ret, p1+1);
- if (ret->u.extended.rule_id == NULL) goto failed;
- }
-
- return ret;
-
-failed:
- talloc_free(ret);
- return NULL;
-}
-
-
-/*
- <simple> ::= <attributetype> <filtertype> <attributevalue>
-*/
-static struct ldb_parse_tree *ldb_parse_simple(void *mem_ctx, const char **s)
-{
- char *attr, *value;
- struct ldb_parse_tree *ret;
- enum ldb_parse_op filtertype;
-
- ret = talloc(mem_ctx, struct ldb_parse_tree);
- if (!ret) {
- errno = ENOMEM;
- return NULL;
- }
-
- filtertype = ldb_parse_filtertype(ret, &attr, &value, s);
- if (!filtertype) {
- talloc_free(ret);
- return NULL;
- }
-
- switch (filtertype) {
-
- case LDB_OP_PRESENT:
- ret->operation = LDB_OP_PRESENT;
- ret->u.present.attr = attr;
- break;
-
- case LDB_OP_EQUALITY:
-
- if (strcmp(value, "*") == 0) {
- ret->operation = LDB_OP_PRESENT;
- ret->u.present.attr = attr;
- break;
- }
-
- if (ldb_parse_find_wildcard(value) != NULL) {
- ret->operation = LDB_OP_SUBSTRING;
- ret->u.substring.attr = attr;
- ret->u.substring.start_with_wildcard = 0;
- ret->u.substring.end_with_wildcard = 0;
- ret->u.substring.chunks = ldb_wildcard_decode(ret, value);
- if (ret->u.substring.chunks == NULL){
- talloc_free(ret);
- return NULL;
- }
- if (value[0] == '*')
- ret->u.substring.start_with_wildcard = 1;
- if (value[strlen(value) - 1] == '*')
- ret->u.substring.end_with_wildcard = 1;
- talloc_free(value);
-
- break;
- }
-
- ret->operation = LDB_OP_EQUALITY;
- ret->u.equality.attr = attr;
- ret->u.equality.value = ldb_binary_decode(ret, value);
- if (ret->u.equality.value.data == NULL) {
- talloc_free(ret);
- return NULL;
- }
- talloc_free(value);
- break;
-
- case LDB_OP_GREATER:
- ret->operation = LDB_OP_GREATER;
- ret->u.comparison.attr = attr;
- ret->u.comparison.value = ldb_binary_decode(ret, value);
- if (ret->u.comparison.value.data == NULL) {
- talloc_free(ret);
- return NULL;
- }
- talloc_free(value);
- break;
-
- case LDB_OP_LESS:
- ret->operation = LDB_OP_LESS;
- ret->u.comparison.attr = attr;
- ret->u.comparison.value = ldb_binary_decode(ret, value);
- if (ret->u.comparison.value.data == NULL) {
- talloc_free(ret);
- return NULL;
- }
- talloc_free(value);
- break;
-
- case LDB_OP_APPROX:
- ret->operation = LDB_OP_APPROX;
- ret->u.comparison.attr = attr;
- ret->u.comparison.value = ldb_binary_decode(ret, value);
- if (ret->u.comparison.value.data == NULL) {
- talloc_free(ret);
- return NULL;
- }
- talloc_free(value);
- break;
-
- case LDB_OP_EXTENDED:
-
- ret = ldb_parse_extended(ret, attr, value);
- break;
-
- default:
- talloc_free(ret);
- return NULL;
- }
-
- return ret;
-}
-
-/*
- parse a filterlist
- <and> ::= '&' <filterlist>
- <or> ::= '|' <filterlist>
- <filterlist> ::= <filter> | <filter> <filterlist>
-*/
-static struct ldb_parse_tree *ldb_parse_filterlist(void *mem_ctx, const char **s)
-{
- struct ldb_parse_tree *ret, *next;
- enum ldb_parse_op op;
- const char *p = *s;
-
- switch (*p) {
- case '&':
- op = LDB_OP_AND;
- break;
- case '|':
- op = LDB_OP_OR;
- break;
- default:
- return NULL;
- }
- p++;
-
- while (isspace((unsigned char)*p)) p++;
-
- ret = talloc(mem_ctx, struct ldb_parse_tree);
- if (!ret) {
- errno = ENOMEM;
- return NULL;
- }
-
- ret->operation = op;
- ret->u.list.num_elements = 1;
- ret->u.list.elements = talloc(ret, struct ldb_parse_tree *);
- if (!ret->u.list.elements) {
- errno = ENOMEM;
- talloc_free(ret);
- return NULL;
- }
-
- ret->u.list.elements[0] = ldb_parse_filter(ret->u.list.elements, &p);
- if (!ret->u.list.elements[0]) {
- talloc_free(ret);
- return NULL;
- }
-
- while (isspace((unsigned char)*p)) p++;
-
- while (*p && (next = ldb_parse_filter(ret->u.list.elements, &p))) {
- struct ldb_parse_tree **e;
- e = talloc_realloc(ret, ret->u.list.elements,
- struct ldb_parse_tree *,
- ret->u.list.num_elements + 1);
- if (!e) {
- errno = ENOMEM;
- talloc_free(ret);
- return NULL;
- }
- ret->u.list.elements = e;
- ret->u.list.elements[ret->u.list.num_elements] = next;
- ret->u.list.num_elements++;
- while (isspace((unsigned char)*p)) p++;
- }
-
- *s = p;
-
- return ret;
-}
-
-/*
- <not> ::= '!' <filter>
-*/
-static struct ldb_parse_tree *ldb_parse_not(void *mem_ctx, const char **s)
-{
- struct ldb_parse_tree *ret;
- const char *p = *s;
-
- if (*p != '!') {
- return NULL;
- }
- p++;
-
- ret = talloc(mem_ctx, struct ldb_parse_tree);
- if (!ret) {
- errno = ENOMEM;
- return NULL;
- }
-
- ret->operation = LDB_OP_NOT;
- ret->u.isnot.child = ldb_parse_filter(ret, &p);
- if (!ret->u.isnot.child) {
- talloc_free(ret);
- return NULL;
- }
-
- *s = p;
-
- return ret;
-}
-
-
-
-/*
- parse a filtercomp
- <filtercomp> ::= <and> | <or> | <not> | <simple>
-*/
-static struct ldb_parse_tree *ldb_parse_filtercomp(void *mem_ctx, const char **s)
-{
- struct ldb_parse_tree *ret;
- const char *p = *s;
-
- while (isspace((unsigned char)*p)) p++;
-
- switch (*p) {
- case '&':
- ret = ldb_parse_filterlist(mem_ctx, &p);
- break;
-
- case '|':
- ret = ldb_parse_filterlist(mem_ctx, &p);
- break;
-
- case '!':
- ret = ldb_parse_not(mem_ctx, &p);
- break;
-
- case '(':
- case ')':
- return NULL;
-
- default:
- ret = ldb_parse_simple(mem_ctx, &p);
-
- }
-
- *s = p;
- return ret;
-}
-
-
-
-/*
- <filter> ::= '(' <filtercomp> ')'
-*/
-static struct ldb_parse_tree *ldb_parse_filter(void *mem_ctx, const char **s)
-{
- struct ldb_parse_tree *ret;
- const char *p = *s;
-
- if (*p != '(') {
- return NULL;
- }
- p++;
-
- ret = ldb_parse_filtercomp(mem_ctx, &p);
-
- if (*p != ')') {
- return NULL;
- }
- p++;
-
- while (isspace((unsigned char)*p)) {
- p++;
- }
-
- *s = p;
-
- return ret;
-}
-
-
-
-/*
- main parser entry point. Takes a search string and returns a parse tree
-
- expression ::= <simple> | <filter>
-*/
-struct ldb_parse_tree *ldb_parse_tree(void *mem_ctx, const char *s)
-{
- if (s == NULL || *s == 0) {
- s = "(|(objectClass=*)(distinguishedName=*))";
- }
-
- while (isspace((unsigned char)*s)) s++;
-
- if (*s == '(') {
- return ldb_parse_filter(mem_ctx, &s);
- }
-
- return ldb_parse_simple(mem_ctx, &s);
-}
-
-
git.samba.org / samba.git / commitdiff