ldb database library
Copyright (C) Andrew Bartlett 2005
+ Copyright (C) Simo Sorce 2006
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:
*
*
*/
-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
- = ldb_get_opaque(module->ldb, "sessionInfo");
- if (!session_info) {
- return ANONYMOUS;
- }
-
- if (is_system_token(session_info->security_token)) {
- return SYSTEM;
- }
-
- if (is_administrator_token(session_info->security_token)) {
- return ADMINISTRATOR;
- }
- if (is_authenticated_token(session_info->security_token)) {
- return USER;
- }
- if (is_anonymous_token(session_info->security_token)) {
- return ANONYMOUS;
- }
- return ANONYMOUS;
+ = (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 "UNKNOWN (NULL)";
}
return talloc_asprintf(mem_ctx, "%s\\%s",
session_info->server_info->domain_name,
session_info->server_info->account_name);
- return ANONYMOUS;
}
/* search */
-static int kludge_acl_search(struct ldb_module *module, struct ldb_request *req)
+struct kludge_acl_context {
+
+ struct ldb_module *module;
+ void *up_context;
+ int (*up_callback)(struct ldb_context *, void *, struct ldb_reply *);
+
+ enum security_user_level user_type;
+ bool allowedAttributes;
+ bool allowedAttributesEffective;
+ bool allowedChildClasses;
+ bool allowedChildClassesEffective;
+ const char **attrs;
+};
+
+/* read all objectClasses */
+
+static int kludge_acl_allowedAttributes(struct ldb_context *ldb, struct ldb_message *msg,
+ const char *attrName)
{
- struct kludge_private_data *data = talloc_get_type(module->private_data, struct kludge_private_data);
- struct ldb_message *msg;
- enum user_is user_type;
+ 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;
+ }
+
+ mem_ctx = talloc_new(msg);
+ if (!mem_ctx) {
+ ldb_oom(ldb);
+ return LDB_ERR_OPERATIONS_ERROR;
+ }
+
+ /* 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;
+ }
+
+ for (i=0; oc_el && i < oc_el->num_values; i++) {
+ objectclass_list[i] = (char *)oc_el->values[i].data;
+ }
+ 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;
+ }
+
+ for (i=0; attr_list && attr_list[i]; i++) {
+ ldb_msg_add_string(msg, attrName, attr_list[i]);
+ }
+ talloc_free(mem_ctx);
+ return 0;
+
+}
+/* read all objectClasses */
+
+static int kludge_acl_childClasses(struct ldb_context *ldb, struct ldb_message *msg,
+ const char *attrName)
+{
+ 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;
- /* go down the path and wait for reply to filter out stuff if needed */
- ret = ldb_next_request(module, req);
+ /* 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 %s is not SYSTEM or an administrator",
- user_name(req, module)));
- return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
- }
-}
+ return 0;
-/* 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_context *ldb, void *context, 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(context, struct kludge_acl_context);
+ data = talloc_get_type(ac->module->private_data, struct kludge_private_data);
+
+ if (ares->type != LDB_REPLY_ENTRY) {
+ return ac->up_callback(ldb, ac->up_context, ares);
+ }
+
+ if (ac->allowedAttributes) {
+ ret = kludge_acl_allowedAttributes(ldb, ares->message, "allowedAttributes");
+ if (ret != LDB_SUCCESS) {
+ return ret;
+
+ }
+ }
+ if (ac->allowedChildClasses) {
+ ret = kludge_acl_childClasses(ldb, ares->message, "allowedChildClasses");
+ if (ret != LDB_SUCCESS) {
+ return ret;
+ }
+ }
+
+ if (data && data->password_attrs) /* if we are not initialized just get through */
+ {
+ switch (ac->user_type) {
+ case SECURITY_SYSTEM:
+ case SECURITY_ADMINISTRATOR:
+ if (ac->allowedAttributesEffective) {
+ ret = kludge_acl_allowedAttributes(ldb, ares->message, "allowedAttributesEffective");
+ if (ret != LDB_SUCCESS) {
+ return ret;
+ }
+ }
+ if (ac->allowedChildClassesEffective) {
+ ret = kludge_acl_childClasses(ldb, ares->message, "allowedChildClassesEffective");
+ if (ret != LDB_SUCCESS) {
+ return ret;
+ }
+ }
+ break;
+ 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) &&
+ (!ldb_attr_in_list(ac->attrs, "objectClass") &&
+ !ldb_attr_in_list(ac->attrs, "*"))) {
+ ldb_msg_remove_attr(ares->message, "objectClass");
+ }
+
+ return ac->up_callback(ldb, ac->up_context, ares);
}
-/* 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;
+ int ret, i;
+
+ req->handle = NULL;
+
+ 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->up_context = req->context;
+ ac->up_callback = req->callback;
+ ac->user_type = what_is_user(module);
+ ac->attrs = req->op.search.attrs;
+
+ down_req = talloc_zero(req, struct ldb_request);
+ if (down_req == NULL) {
+ ldb_oom(module->ldb);
+ return LDB_ERR_OPERATIONS_ERROR;
+ }
+
+ down_req->operation = req->operation;
+ down_req->op.search.base = req->op.search.base;
+ down_req->op.search.scope = req->op.search.scope;
+ down_req->op.search.tree = req->op.search.tree;
+ down_req->op.search.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) {
+ down_req->op.search.attrs
+ = ldb_attr_list_copy_add(down_req, down_req->op.search.attrs, "objectClass");
+ }
+
+ /* FIXME: I hink we should copy the tree and keep the original
+ * unmodified. SSS */
+ /* replace any attributes in the parse tree that are private,
+ so we don't allow a search for 'sambaPassword=penguin',
+ just as we would not allow that attribute to be returned */
+ switch (ac->user_type) {
+ case SECURITY_SYSTEM:
+ break;
+ default:
+ /* remove password attributes */
+ for (i = 0; data && data->password_attrs && data->password_attrs[i]; i++) {
+ ldb_parse_tree_attr_replace(down_req->op.search.tree,
+ data->password_attrs[i],
+ "kludgeACLredactedattribute");
+ }
+ }
+
+ down_req->controls = req->controls;
+
+ down_req->context = ac;
+ down_req->callback = kludge_acl_callback;
+ ldb_set_timeout_from_prev_req(module->ldb, req, down_req);
+
+ /* perform the search */
+ ret = ldb_next_request(module, down_req);
+
+ /* do not free down_req as the call results may be linked to it,
+ * it will be freed when the upper level request get freed */
+ if (ret == LDB_SUCCESS) {
+ req->handle = down_req->handle;
+ }
+
+ return ret;
}
-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"),
+ ret = ldb_search(module->ldb, ldb_dn_new(mem_ctx, module->ldb, "@KLUDGEACL"),
LDB_SCOPE_BASE,
NULL, attrs,
&res);
if (ret != LDB_SUCCESS) {
- talloc_free(mem_ctx);
- return ret;
+ goto done;
}
+ talloc_steal(mem_ctx, res);
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;
+
+done:
+ talloc_free(mem_ctx);
+ return ldb_next_init(module);
}
-static const struct ldb_module_ops kludge_acl_ops = {
+_PUBLIC_ const struct ldb_module_ops ldb_kludge_acl_module_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
+ .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
};
-
-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;
- }
-
- data->password_attrs = NULL;
- ctx->private_data = data;
-
- ctx->ldb = ldb;
- ctx->prev = ctx->next = NULL;
- ctx->ops = &kludge_acl_ops;
-
- return ctx;
-}
git.samba.org / kai / samba.git / blobdiff