ldb database library
Copyright (C) Andrew Bartlett 2005
+ Copyright (C) Simo Sorce 2006-2008
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
#include "ldb/include/ldb_errors.h"
#include "ldb/include/ldb_private.h"
#include "auth/auth.h"
+#include "libcli/security/security.h"
+#include "dsdb/samdb/samdb.h"
/* Kludge ACL rules:
*
*
*/
-const char *password_attribs[] = {
-};
-
-enum user_is {
- ANONYMOUS,
- USER,
- ADMINISTRATOR,
- SYSTEM
-};
-
struct kludge_private_data {
const char **password_attrs;
};
-static enum user_is what_is_user(struct ldb_module *module)
+static enum security_user_level what_is_user(struct ldb_module *module)
+{
+ struct auth_session_info *session_info
+ = (struct auth_session_info *)ldb_get_opaque(module->ldb, "sessionInfo");
+ return security_session_user_level(session_info);
+}
+
+static const char *user_name(TALLOC_CTX *mem_ctx, struct ldb_module *module)
{
struct auth_session_info *session_info
- = ldb_get_opaque(module->ldb, "sessionInfo");
+ = (struct auth_session_info *)ldb_get_opaque(module->ldb, "sessionInfo");
if (!session_info) {
- return ANONYMOUS;
+ return "UNKNOWN (NULL)";
+ }
+
+ return talloc_asprintf(mem_ctx, "%s\\%s",
+ session_info->server_info->domain_name,
+ session_info->server_info->account_name);
+}
+
+/* search */
+struct kludge_acl_context {
+
+ struct ldb_module *module;
+ struct ldb_request *req;
+
+ enum security_user_level user_type;
+ bool allowedAttributes;
+ bool allowedAttributesEffective;
+ bool allowedChildClasses;
+ bool allowedChildClassesEffective;
+ const char * const *attrs;
+};
+
+/* read all objectClasses */
+
+static int kludge_acl_allowedAttributes(struct ldb_context *ldb, struct ldb_message *msg,
+ const char *attrName)
+{
+ struct ldb_message_element *oc_el;
+ struct ldb_message_element *allowedAttributes;
+ const struct dsdb_schema *schema = dsdb_get_schema(ldb);
+ TALLOC_CTX *mem_ctx;
+ char **objectclass_list, **attr_list;
+ int i, ret;
+
+ /* If we don't have a schema yet, we can't do anything... */
+ if (schema == NULL) {
+ return LDB_SUCCESS;
+ }
+
+ /* Must remove any existing attribute, or else confusion reins */
+ ldb_msg_remove_attr(msg, attrName);
+ ret = ldb_msg_add_empty(msg, attrName, 0, &allowedAttributes);
+ if (ret != LDB_SUCCESS) {
+ return ret;
}
- if (is_system_token(session_info->security_token)) {
- return SYSTEM;
+ mem_ctx = talloc_new(msg);
+ if (!mem_ctx) {
+ ldb_oom(ldb);
+ return LDB_ERR_OPERATIONS_ERROR;
}
- if (is_administrator_token(session_info->security_token)) {
- return ADMINISTRATOR;
+ /* To ensure that oc_el is valid, we must look for it after
+ we alter the element array in ldb_msg_add_empty() */
+ oc_el = ldb_msg_find_element(msg, "objectClass");
+
+ objectclass_list = talloc_array(mem_ctx, char *, oc_el->num_values + 1);
+ if (!objectclass_list) {
+ ldb_oom(ldb);
+ talloc_free(mem_ctx);
+ return LDB_ERR_OPERATIONS_ERROR;
}
- if (is_authenticated_token(session_info->security_token)) {
- return USER;
+
+ for (i=0; oc_el && i < oc_el->num_values; i++) {
+ objectclass_list[i] = (char *)oc_el->values[i].data;
}
- if (is_anonymous_token(session_info->security_token)) {
- return ANONYMOUS;
+ objectclass_list[i] = NULL;
+
+ attr_list = dsdb_full_attribute_list(mem_ctx, schema, (const char **)objectclass_list, DSDB_SCHEMA_ALL);
+ if (!attr_list) {
+ ldb_asprintf_errstring(ldb, "kludge_acl: Failed to get list of attributes create %s attribute", attrName);
+ talloc_free(mem_ctx);
+ return LDB_ERR_OPERATIONS_ERROR;
}
- return ANONYMOUS;
+
+ for (i=0; attr_list && attr_list[i]; i++) {
+ ldb_msg_add_string(msg, attrName, attr_list[i]);
+ }
+ talloc_free(mem_ctx);
+ return LDB_SUCCESS;
+
}
+/* read all objectClasses */
-/* search */
-static int kludge_acl_search(struct ldb_module *module, struct ldb_request *req)
+static int kludge_acl_childClasses(struct ldb_context *ldb, struct ldb_message *msg,
+ const char *attrName)
{
- enum user_is user_type;
- int ret = ldb_next_request(module, req);
- struct ldb_message *msg;
- struct kludge_private_data *data = talloc_get_type(module->private_data, struct kludge_private_data);
- int i, j;
+ struct ldb_message_element *oc_el;
+ struct ldb_message_element *allowedClasses;
+ const struct dsdb_schema *schema = dsdb_get_schema(ldb);
+ const struct dsdb_class *class;
+ int i, j, ret;
+
+ /* If we don't have a schema yet, we can't do anything... */
+ if (schema == NULL) {
+ return LDB_SUCCESS;
+ }
- /* We may not be fully initialised yet, or we might have just
- * got an error */
- if (ret != LDB_SUCCESS || !data->password_attrs) {
+ /* Must remove any existing attribute, or else confusion reins */
+ ldb_msg_remove_attr(msg, attrName);
+ ret = ldb_msg_add_empty(msg, attrName, 0, &allowedClasses);
+ if (ret != LDB_SUCCESS) {
return ret;
}
+
+ /* To ensure that oc_el is valid, we must look for it after
+ we alter the element array in ldb_msg_add_empty() */
+ oc_el = ldb_msg_find_element(msg, "objectClass");
+
+ for (i=0; oc_el && i < oc_el->num_values; i++) {
+ class = dsdb_class_by_lDAPDisplayName(schema, (const char *)oc_el->values[i].data);
+ if (!class) {
+ /* We don't know this class? what is going on? */
+ continue;
+ }
- user_type = what_is_user(module);
- switch (user_type) {
- case SYSTEM:
- case ADMINISTRATOR:
- return ret;
- default:
- /* For every message, remove password attributes */
- for (i=0; i < req->op.search.res->count; i++) {
- msg = req->op.search.res->msgs[i];
- for (j=0; data->password_attrs[j]; j++) {
- ldb_msg_remove_attr(msg, data->password_attrs[j]);
+ for (j=0; class->possibleInferiors && class->possibleInferiors[j]; j++) {
+ ldb_msg_add_string(msg, attrName, class->possibleInferiors[j]);
+ }
+ }
+
+ if (allowedClasses->num_values > 1) {
+ qsort(allowedClasses->values,
+ allowedClasses->num_values,
+ sizeof(*allowedClasses->values),
+ (comparison_fn_t)data_blob_cmp);
+
+ for (i=1 ; i < allowedClasses->num_values; i++) {
+
+ struct ldb_val *val1 = &allowedClasses->values[i-1];
+ struct ldb_val *val2 = &allowedClasses->values[i];
+ if (data_blob_cmp(val1, val2) == 0) {
+ memmove(val1, val2, (allowedClasses->num_values - i) * sizeof( struct ldb_val));
+ allowedClasses->num_values--;
+ i--;
}
}
}
- return ret;
-}
-/* ANY change type */
-static int kludge_acl_change(struct ldb_module *module, struct ldb_request *req){
- enum user_is user_type = what_is_user(module);
- switch (user_type) {
- case SYSTEM:
- case ADMINISTRATOR:
- return ldb_next_request(module, req);
- default:
- ldb_set_errstring(module,
- talloc_asprintf(req, "kludge_acl_change: "
- "attempted database modify not permitted. User is not SYSTEM or an administrator"));
- return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
- }
-}
+ return LDB_SUCCESS;
-/* start a transaction */
-static int kludge_acl_start_trans(struct ldb_module *module)
-{
- return ldb_next_start_trans(module);
}
-/* end a transaction */
-static int kludge_acl_end_trans(struct ldb_module *module)
+/* find all attributes allowed by all these objectClasses */
+
+static int kludge_acl_callback(struct ldb_request *req, struct ldb_reply *ares)
{
- return ldb_next_end_trans(module);
+ struct kludge_acl_context *ac;
+ struct kludge_private_data *data;
+ int i, ret;
+
+ ac = talloc_get_type(req->context, struct kludge_acl_context);
+ data = talloc_get_type(ac->module->private_data, struct kludge_private_data);
+
+ if (!ares) {
+ return ldb_module_done(ac->req, NULL, NULL,
+ LDB_ERR_OPERATIONS_ERROR);
+ }
+ if (ares->error != LDB_SUCCESS) {
+ return ldb_module_done(ac->req, ares->controls,
+ ares->response, ares->error);
+ }
+
+ switch (ares->type) {
+ case LDB_REPLY_ENTRY:
+ if (ac->allowedAttributes) {
+ ret = kludge_acl_allowedAttributes(ac->module->ldb,
+ ares->message,
+ "allowedAttributes");
+ if (ret != LDB_SUCCESS) {
+ return ldb_module_done(ac->req, NULL, NULL, ret);
+ }
+ }
+ if (ac->allowedChildClasses) {
+ ret = kludge_acl_childClasses(ac->module->ldb,
+ ares->message,
+ "allowedChildClasses");
+ if (ret != LDB_SUCCESS) {
+ return ldb_module_done(ac->req, NULL, NULL, ret);
+ }
+ }
+
+ if (data && data->password_attrs) /* if we are not initialized just get through */
+ {
+ switch (ac->user_type) {
+ case SECURITY_SYSTEM:
+ if (ac->allowedAttributesEffective) {
+ ret = kludge_acl_allowedAttributes(ac->module->ldb, ares->message,
+ "allowedAttributesEffective");
+ if (ret != LDB_SUCCESS) {
+ return ldb_module_done(ac->req, NULL, NULL, ret);
+ }
+ }
+ if (ac->allowedChildClassesEffective) {
+ ret = kludge_acl_childClasses(ac->module->ldb, ares->message,
+ "allowedChildClassesEffective");
+ if (ret != LDB_SUCCESS) {
+ return ldb_module_done(ac->req, NULL, NULL, ret);
+ }
+ }
+ break;
+
+ case SECURITY_ADMINISTRATOR:
+ if (ac->allowedAttributesEffective) {
+ ret = kludge_acl_allowedAttributes(ac->module->ldb, ares->message,
+ "allowedAttributesEffective");
+ if (ret != LDB_SUCCESS) {
+ return ldb_module_done(ac->req, NULL, NULL, ret);
+ }
+ }
+ if (ac->allowedChildClassesEffective) {
+ ret = kludge_acl_childClasses(ac->module->ldb, ares->message,
+ "allowedChildClassesEffective");
+ if (ret != LDB_SUCCESS) {
+ return ldb_module_done(ac->req, NULL, NULL, ret);
+ }
+ }
+ /* fall through */
+ default:
+ /* remove password attributes */
+ for (i = 0; data->password_attrs[i]; i++) {
+ ldb_msg_remove_attr(ares->message, data->password_attrs[i]);
+ }
+ }
+ }
+
+ if (ac->allowedAttributes ||
+ ac->allowedAttributesEffective ||
+ ac->allowedChildClasses ||
+ ac->allowedChildClassesEffective) {
+
+ if (!ldb_attr_in_list(ac->attrs, "objectClass") &&
+ !ldb_attr_in_list(ac->attrs, "*")) {
+
+ ldb_msg_remove_attr(ares->message,
+ "objectClass");
+ }
+ }
+
+ return ldb_module_send_entry(ac->req, ares->message);
+
+ case LDB_REPLY_REFERRAL:
+ return ldb_module_send_referral(ac->req, ares->referral);
+
+ case LDB_REPLY_DONE:
+ return ldb_module_done(ac->req, ares->controls,
+ ares->response, LDB_SUCCESS);
+
+ }
+ return LDB_SUCCESS;
}
-/* delete a transaction */
-static int kludge_acl_del_trans(struct ldb_module *module)
+static int kludge_acl_search(struct ldb_module *module, struct ldb_request *req)
{
- return ldb_next_del_trans(module);
+ struct kludge_acl_context *ac;
+ struct ldb_request *down_req;
+ struct kludge_private_data *data;
+ const char * const *attrs;
+ int ret, i;
+ struct ldb_control *sd_control;
+ struct ldb_control **sd_saved_controls;
+
+ ac = talloc(req, struct kludge_acl_context);
+ if (ac == NULL) {
+ ldb_oom(module->ldb);
+ return LDB_ERR_OPERATIONS_ERROR;
+ }
+
+ data = talloc_get_type(module->private_data, struct kludge_private_data);
+
+ ac->module = module;
+ ac->req = req;
+ ac->user_type = what_is_user(module);
+ ac->attrs = req->op.search.attrs;
+
+ ac->allowedAttributes = ldb_attr_in_list(req->op.search.attrs, "allowedAttributes");
+
+ ac->allowedAttributesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedAttributesEffective");
+
+ ac->allowedChildClasses = ldb_attr_in_list(req->op.search.attrs, "allowedChildClasses");
+
+ ac->allowedChildClassesEffective = ldb_attr_in_list(req->op.search.attrs, "allowedChildClassesEffective");
+
+ if (ac->allowedAttributes || ac->allowedAttributesEffective || ac->allowedChildClasses || ac->allowedChildClassesEffective) {
+ attrs = ldb_attr_list_copy_add(ac, req->op.search.attrs, "objectClass");
+ } else {
+ attrs = req->op.search.attrs;
+ }
+
+ /* replace any attributes in the parse tree that are private,
+ so we don't allow a search for 'userPassword=penguin',
+ just as we would not allow that attribute to be returned */
+ switch (ac->user_type) {
+ case SECURITY_SYSTEM:
+ break;
+ default:
+ /* FIXME: We should copy the tree and keep the original unmodified. */
+ /* remove password attributes */
+
+ if (!data || !data->password_attrs) {
+ break;
+ }
+ for (i = 0; data->password_attrs[i]; i++) {
+ ldb_parse_tree_attr_replace(req->op.search.tree,
+ data->password_attrs[i],
+ "kludgeACLredactedattribute");
+ }
+ }
+
+ ret = ldb_build_search_req_ex(&down_req,
+ module->ldb, ac,
+ req->op.search.base,
+ req->op.search.scope,
+ req->op.search.tree,
+ attrs,
+ req->controls,
+ ac, kludge_acl_callback,
+ req);
+ if (ret != LDB_SUCCESS) {
+ return LDB_ERR_OPERATIONS_ERROR;
+ }
+
+ /* check if there's an SD_FLAGS control */
+ sd_control = ldb_request_get_control(down_req, LDB_CONTROL_SD_FLAGS_OID);
+ if (sd_control) {
+ /* save it locally and remove it from the list */
+ /* we do not need to replace them later as we
+ * are keeping the original req intact */
+ if (!save_controls(sd_control, down_req, &sd_saved_controls)) {
+ return LDB_ERR_OPERATIONS_ERROR;
+ }
+ }
+
+ /* perform the search */
+ return ldb_next_request(module, down_req);
}
-static int kludge_acl_request(struct ldb_module *module, struct ldb_request *req)
+/* ANY change type */
+static int kludge_acl_change(struct ldb_module *module, struct ldb_request *req)
{
- switch (req->operation) {
-
- case LDB_REQ_SEARCH:
- return kludge_acl_search(module, req);
- case LDB_REQ_REGISTER:
+ enum security_user_level user_type = what_is_user(module);
+ switch (user_type) {
+ case SECURITY_SYSTEM:
+ case SECURITY_ADMINISTRATOR:
return ldb_next_request(module, req);
default:
- /* anything else must be a change of some kind */
- return kludge_acl_change(module, req);
+ ldb_asprintf_errstring(module->ldb,
+ "kludge_acl_change: "
+ "attempted database modify not permitted. "
+ "User %s is not SYSTEM or an administrator",
+ user_name(req, module));
+ return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
}
}
-static int kludge_acl_init_2(struct ldb_module *module)
+static int kludge_acl_init(struct ldb_module *module)
{
int ret, i;
TALLOC_CTX *mem_ctx = talloc_new(module);
- const char *attrs[] = { "attribute", NULL };
+ static const char *attrs[] = { "passwordAttribute", NULL };
struct ldb_result *res;
struct ldb_message *msg;
struct ldb_message_element *password_attributes;
- struct kludge_private_data *data = talloc_get_type(module->private_data, struct kludge_private_data);
+ struct kludge_private_data *data;
+
+ data = talloc(module, struct kludge_private_data);
+ if (data == NULL) {
+ ldb_oom(module->ldb);
+ return LDB_ERR_OPERATIONS_ERROR;
+ }
+
data->password_attrs = NULL;
+ module->private_data = data;
if (!mem_ctx) {
+ ldb_oom(module->ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
- ret = ldb_search(module->ldb, ldb_dn_explode(mem_ctx, "@KLUDGEACL"),
- LDB_SCOPE_BASE,
- NULL, attrs,
- &res);
+ ret = ldb_search(module->ldb, mem_ctx, &res,
+ ldb_dn_new(mem_ctx, module->ldb, "@KLUDGEACL"),
+ LDB_SCOPE_BASE, attrs, NULL);
if (ret != LDB_SUCCESS) {
- talloc_free(mem_ctx);
- return ret;
+ goto done;
}
if (res->count == 0) {
- talloc_free(mem_ctx);
- data->password_attrs = NULL;
- return LDB_SUCCESS;
+ goto done;
}
if (res->count > 1) {
- return LDB_ERR_CONSTRAINT_VIOLAION;
+ talloc_free(mem_ctx);
+ return LDB_ERR_CONSTRAINT_VIOLATION;
}
msg = res->msgs[0];
password_attributes = ldb_msg_find_element(msg, "passwordAttribute");
if (!password_attributes) {
- return LDB_SUCCESS;
+ goto done;
}
data->password_attrs = talloc_array(data, const char *, password_attributes->num_values + 1);
if (!data->password_attrs) {
+ talloc_free(mem_ctx);
+ ldb_oom(module->ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
for (i=0; i < password_attributes->num_values; i++) {
talloc_steal(data->password_attrs, password_attributes->values[i].data);
}
data->password_attrs[i] = NULL;
- return LDB_SUCCESS;
-}
-
-static const struct ldb_module_ops kludge_acl_ops = {
- .name = "kludge_acl",
- .request = kludge_acl_request,
- .start_transaction = kludge_acl_start_trans,
- .end_transaction = kludge_acl_end_trans,
- .del_transaction = kludge_acl_del_trans,
- .second_stage_init = kludge_acl_init_2
-};
-
-struct ldb_module *kludge_acl_module_init(struct ldb_context *ldb, const char *options[])
-{
- struct ldb_module *ctx;
- struct kludge_private_data *data;
-
- ctx = talloc(ldb, struct ldb_module);
- if (!ctx)
- return NULL;
- data = talloc(ctx, struct kludge_private_data);
- if (data == NULL) {
- talloc_free(ctx);
- return NULL;
+ ret = ldb_mod_register_control(module, LDB_CONTROL_SD_FLAGS_OID);
+ if (ret != LDB_SUCCESS) {
+ ldb_debug(module->ldb, LDB_DEBUG_ERROR,
+ "partition: Unable to register control with rootdse!\n");
+ return LDB_ERR_OPERATIONS_ERROR;
}
- data->password_attrs = NULL;
- ctx->private_data = data;
-
- ctx->ldb = ldb;
- ctx->prev = ctx->next = NULL;
- ctx->ops = &kludge_acl_ops;
-
- return ctx;
+done:
+ talloc_free(mem_ctx);
+ return ldb_next_init(module);
}
+
+_PUBLIC_ const struct ldb_module_ops ldb_kludge_acl_module_ops = {
+ .name = "kludge_acl",
+ .search = kludge_acl_search,
+ .add = kludge_acl_change,
+ .modify = kludge_acl_change,
+ .del = kludge_acl_change,
+ .rename = kludge_acl_change,
+ .extended = kludge_acl_change,
+ .init_context = kludge_acl_init
+};
git.samba.org / samba.git / blobdiff