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[2007-02-28 19:47 UTC] cardoe at gentoo dot org
Description: ------------ Referencing Bug #38819 Essentially I looked through the above mentioned bug, the bugs opened with OpenLDAP developers, and then reviewed ext/ldap/ldap.c and it appears the API calls made by PHP are not necessarily the safest ways to write the PHP wrapper functions. Based on tony2001@php.net's comment that the LDAP module is unmaintained I went ahead and made some changes. If you read OpenLDAP's API and comments by OpenLDAP Core Developers, available at: http://www.openldap.org/its/index.cgi/Build?id=4690;selectid=4690 http://www.openldap.org/software/man.cgi?query=ldap_get_values&sektion=3&apropos=0&manpath=OpenLDAP+2.1-Release (Notice I went with OpenLDAP 2.1 docs to quell PHP's urge for backwards compatibility) The functions char **ldap_get_values(ld, entry, attr) and struct berval **ldap_get_values_len(ld, entry, attr) are essentially inter-changeable. The big difference being that the berval struct provides you with a char * and the size_t of the data. Rather then just a char * that you then have to strlen() which will result in problems if the returned data is not NULL terminated data. PHP's internal functions make the mistake of assuming all data will be string data (NULL terminated char *) data, which is the cause of the crash in bug #38819. The patch attached removes all of those assumptions and uses ldap_get_values_len() and uses the length provided back by the structure to feed add_index_stringl() instead of using add_index_string() which will call it's own strlen() on the provided data. This patch also removes ldap_get_values() as a PHP function and makes it an alias of ldap_get_values_len() since there's no difference and the same data can be returned, it's just a safer version. The attached patch fixes the test case provided in bug #38819. Referencing for my own purposes: http://bugs.gentoo.org/show_bug.cgi?id=133467 Reproduce code: --------------- For reproducing code refer to bug #38819 Actual result: -------------- For a backtrace see bug #38819. PatchesPull RequestsHistoryAllCommentsChangesGit/SVN commits
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diff -Nur php-5.1.6/ext/ldap/ldap.c php-5.1.6-ldap-api/ext/ldap/ldap.c --- php-5.1.6/ext/ldap/ldap.c 2006-01-01 07:50:08.000000000 -0500 +++ php-5.1.6-ldap-api/ext/ldap/ldap.c 2007-02-28 11:04:05.000000000 -0500 @@ -116,7 +116,8 @@ PHP_FE(ldap_first_attribute, third_arg_force_ref) PHP_FE(ldap_next_attribute, third_arg_force_ref) PHP_FE(ldap_get_attributes, NULL) - PHP_FE(ldap_get_values, NULL) + PHP_FALIAS(ldap_get_values, ldap_get_values_len, NULL) +/* PHP_FE(ldap_get_values, NULL) */ PHP_FE(ldap_get_values_len, NULL) PHP_FE(ldap_get_dn, NULL) PHP_FE(ldap_explode_dn, NULL) @@ -1033,7 +1034,7 @@ BerElement *ber; char *attribute; size_t attr_len; - char **ldap_value; + struct berval **ldap_value; char *dn; if (ZEND_NUM_ARGS() != 2 || zend_get_parameters_ex(2, &link, &result) == FAILURE) { @@ -1064,16 +1065,16 @@ attribute = ldap_first_attribute(ldap, ldap_result_entry, &ber); while (attribute != NULL) { - ldap_value = ldap_get_values(ldap, ldap_result_entry, attribute); - num_values = ldap_count_values(ldap_value); + ldap_value = ldap_get_values_len(ldap, ldap_result_entry, attribute); + num_values = ldap_count_values_len(ldap_value); MAKE_STD_ZVAL(tmp2); array_init(tmp2); add_assoc_long(tmp2, "count", num_values); for (i = 0; i < num_values; i++) { - add_index_string(tmp2, i, ldap_value[i], 1); + add_index_stringl(tmp2, i, ldap_value[i]->bv_val, ldap_value[i]->bv_len, 1); } - ldap_value_free(ldap_value); + ldap_value_free_len(ldap_value); attr_len = strlen(attribute); zend_hash_update(Z_ARRVAL_P(tmp1), php_strtolower(attribute, attr_len), attr_len+1, (void *) &tmp2, sizeof(zval *), NULL); @@ -1180,7 +1181,7 @@ ldap_linkdata *ld; ldap_resultentry *resultentry; char *attribute; - char **ldap_value; + struct berval **ldap_value; int i, num_values, num_attrib; BerElement *ber; @@ -1196,16 +1197,16 @@ attribute = ldap_first_attribute(ld->link, resultentry->data, &ber); while (attribute != NULL) { - ldap_value = ldap_get_values(ld->link, resultentry->data, attribute); - num_values = ldap_count_values(ldap_value); + ldap_value = ldap_get_values_len(ld->link, resultentry->data, attribute); + num_values = ldap_count_values_len(ldap_value); MAKE_STD_ZVAL(tmp); array_init(tmp); add_assoc_long(tmp, "count", num_values); for (i = 0; i < num_values; i++) { - add_index_string(tmp, i, ldap_value[i], 1); + add_index_stringl(tmp, i, ldap_value[i]->bv_val, ldap_value[i]->bv_len, 1); } - ldap_value_free(ldap_value); + ldap_value_free_len(ldap_value); zend_hash_update(Z_ARRVAL_P(return_value), attribute, strlen(attribute)+1, (void *) &tmp, sizeof(zval *), NULL); add_index_string(return_value, num_attrib, attribute, 1); @@ -1226,46 +1227,6 @@ } /* }}} */ -/* {{{ proto array ldap_get_values(resource link, resource result_entry, string attribute) - Get all values from a result entry */ -PHP_FUNCTION(ldap_get_values) -{ - zval **link, **result_entry, **attr; - ldap_linkdata *ld; - ldap_resultentry *resultentry; - char *attribute; - char **ldap_value; - int i, num_values; - - if (ZEND_NUM_ARGS() != 3 || zend_get_parameters_ex(3, &link, &result_entry, &attr) == FAILURE) { - WRONG_PARAM_COUNT; - } - - ZEND_FETCH_RESOURCE(ld, ldap_linkdata *, link, -1, "ldap link", le_link); - ZEND_FETCH_RESOURCE(resultentry, ldap_resultentry *, result_entry, -1, "ldap result entry", le_result_entry); - - convert_to_string_ex(attr); - attribute = Z_STRVAL_PP(attr); - - if ((ldap_value = ldap_get_values(ld->link, resultentry->data, attribute)) == NULL) { - php_error_docref(NULL TSRMLS_CC, E_WARNING, "Cannot get the value(s) of attribute %s", ldap_err2string(_get_lderrno(ld->link))); - RETURN_FALSE; - } - - num_values = ldap_count_values(ldap_value); - - array_init(return_value); - - for (i = 0; i<num_values; i++) { - add_next_index_string(return_value, ldap_value[i], 1); - } - - add_assoc_long(return_value, "count", num_values); - ldap_value_free(ldap_value); - -} -/* }}} */ - /* {{{ proto array ldap_get_values_len(resource link, resource result_entry, string attribute) Get all values with lengths from a result entry */ PHP_FUNCTION(ldap_get_values_len)