[SCM] Samba Shared Repository - branch master updated
Nadezhda Ivanova
nivanova at samba.org
Wed Dec 8 04:01:02 MST 2010
The branch, master has been updated
via 2079a6d s4-acl: Changed the mechanism of attribute removal to speed it up.
via fe98b9a s4-acl: Added a flag to mark an element as failing an access check.
from af3414f ndr: Another try to support the build on non-IPv6 systems
http://gitweb.samba.org/?p=samba.git;a=shortlog;h=master
- Log -----------------------------------------------------------------
commit 2079a6d110ae12f12497605a03deae6720434a6c
Author: Nadezhda Ivanova <nivanova at samba.org>
Date: Wed Dec 8 12:12:34 2010 +0200
s4-acl: Changed the mechanism of attribute removal to speed it up.
Instead of using ldb_msg_remove_attr, now we are flagging the attributes to be removed,
and allocating the new elements array to be returned at once. This seems to decrease the
overhead by 50 percent.
Autobuild-User: Nadezhda Ivanova <nivanova at samba.org>
Autobuild-Date: Wed Dec 8 12:00:27 CET 2010 on sn-devel-104
commit fe98b9aaebd57e3461fa2ac59a2924a6ef6f09fa
Author: Nadezhda Ivanova <nivanova at samba.org>
Date: Wed Dec 8 12:03:43 2010 +0200
s4-acl: Added a flag to mark an element as failing an access check.
-----------------------------------------------------------------------
Summary of changes:
source4/dsdb/samdb/ldb_modules/acl_read.c | 129 ++++++++++++++++++++---------
source4/lib/ldb/include/ldb_module.h | 3 +
2 files changed, 91 insertions(+), 41 deletions(-)
Changeset truncated at 500 lines:
diff --git a/source4/dsdb/samdb/ldb_modules/acl_read.c b/source4/dsdb/samdb/ldb_modules/acl_read.c
index 87144f9..c7aaf11 100644
--- a/source4/dsdb/samdb/ldb_modules/acl_read.c
+++ b/source4/dsdb/samdb/ldb_modules/acl_read.c
@@ -53,12 +53,22 @@ struct aclread_private {
bool enabled;
};
+static void aclread_mark_inaccesslible(struct ldb_message_element *el) {
+ el->flags |= LDB_FLAG_INTERNAL_INACCESSIBLE_ATTRIBUTE;
+}
+
+static bool aclread_is_inaccessible(struct ldb_message_element *el) {
+ return el->flags & LDB_FLAG_INTERNAL_INACCESSIBLE_ATTRIBUTE;
+}
+
static int aclread_callback(struct ldb_request *req, struct ldb_reply *ares)
{
struct ldb_context *ldb;
struct aclread_context *ac;
- int ret;
- unsigned int i;
+ struct ldb_message *ret_msg;
+ struct ldb_message *msg;
+ int ret, num_of_attrs = 0;
+ unsigned int i, k = 0;
struct security_descriptor *sd;
struct dom_sid *sid = NULL;
TALLOC_CTX *tmp_ctx;
@@ -76,20 +86,21 @@ static int aclread_callback(struct ldb_request *req, struct ldb_reply *ares)
tmp_ctx = talloc_new(ac);
switch (ares->type) {
case LDB_REPLY_ENTRY:
- ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, ares->message, &sd);
+ msg = ares->message;
+ ret = dsdb_get_sd_from_ldb_message(ldb, tmp_ctx, msg, &sd);
if (ret != LDB_SUCCESS) {
DEBUG(10, ("acl_read: cannot get descriptor\n"));
ret = LDB_ERR_OPERATIONS_ERROR;
goto fail;
}
- sid = samdb_result_dom_sid(tmp_ctx, ares->message, "objectSid");
+ sid = samdb_result_dom_sid(tmp_ctx, msg, "objectSid");
/* get the object instance type */
- instanceType = ldb_msg_find_attr_as_uint(ares->message,
+ instanceType = ldb_msg_find_attr_as_uint(msg,
"instanceType", 0);
- if (!ldb_dn_is_null(ares->message->dn) && !(instanceType & INSTANCE_TYPE_IS_NC_HEAD))
+ if (!ldb_dn_is_null(msg->dn) && !(instanceType & INSTANCE_TYPE_IS_NC_HEAD))
{
/* the object has a parent, so we have to check for visibility */
- struct ldb_dn *parent_dn = ldb_dn_get_parent(tmp_ctx, ares->message->dn);
+ struct ldb_dn *parent_dn = ldb_dn_get_parent(tmp_ctx, msg->dn);
ret = dsdb_module_check_access_on_dn(ac->module,
tmp_ctx,
parent_dn,
@@ -103,61 +114,97 @@ static int aclread_callback(struct ldb_request *req, struct ldb_reply *ares)
}
}
/* for every element in the message check RP */
- i = 0;
- while (i < ares->message->num_elements) {
+ for (i=0; i < msg->num_elements; i++) {
const struct dsdb_attribute *attr;
+ bool is_sd, is_objectsid, is_instancetype;
+ uint32_t access_mask;
attr = dsdb_attribute_by_lDAPDisplayName(ac->schema,
- ares->message->elements[i].name);
+ msg->elements[i].name);
if (!attr) {
DEBUG(2, ("acl_read: cannot find attribute %s in schema\n",
- ares->message->elements[i].name));
+ msg->elements[i].name));
ret = LDB_ERR_OPERATIONS_ERROR;
goto fail;
}
+ is_sd = ldb_attr_cmp("nTSecurityDescriptor",
+ msg->elements[i].name) == 0;
+ is_objectsid = ldb_attr_cmp("objectSid",
+ msg->elements[i].name) == 0;
+ is_instancetype = ldb_attr_cmp("instanceType",
+ msg->elements[i].name) == 0;
+ /* these attributes were added to perform access checks and must be removed */
+ if (is_objectsid && ac->object_sid) {
+ aclread_mark_inaccesslible(&msg->elements[i]);
+ continue;
+ }
+ if (is_instancetype && ac->instance_type) {
+ aclread_mark_inaccesslible(&msg->elements[i]);
+ continue;
+ }
+ if (is_sd && ac->sd) {
+ aclread_mark_inaccesslible(&msg->elements[i]);
+ continue;
+ }
/* nTSecurityDescriptor is a special case */
- if (ldb_attr_cmp("nTSecurityDescriptor",
- ares->message->elements[i].name) == 0) {
- if (ac->sd) {
- ldb_msg_remove_attr(ares->message, ares->message->elements[i].name);
- ret = LDB_SUCCESS;
- }
- ret = acl_check_access_on_attribute(ac->module,
- tmp_ctx,
- sd,
- sid,
- SEC_FLAG_SYSTEM_SECURITY|SEC_STD_READ_CONTROL,
- attr);
+ if (is_sd) {
+ access_mask = SEC_FLAG_SYSTEM_SECURITY|SEC_STD_READ_CONTROL;
} else {
- ret = acl_check_access_on_attribute(ac->module,
- tmp_ctx,
- sd,
- sid,
- SEC_ADS_READ_PROP,
- attr);
+ access_mask = SEC_ADS_READ_PROP;
}
- if (ret == LDB_SUCCESS) {
- i++;
- } else if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
+ ret = acl_check_access_on_attribute(ac->module,
+ tmp_ctx,
+ sd,
+ sid,
+ access_mask,
+ attr);
+
+ if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
/* do not return this entry if attribute is
- part of the search filter */
+ part of the search filter */
if (dsdb_attr_in_parse_tree(ac->req->op.search.tree,
- ares->message->elements[i].name)) {
+ msg->elements[i].name)) {
talloc_free(tmp_ctx);
return LDB_SUCCESS;
}
- ldb_msg_remove_attr(ares->message, ares->message->elements[i].name);
- } else {
+ aclread_mark_inaccesslible(&msg->elements[i]);
+ } else if (ret != LDB_SUCCESS) {
goto fail;
}
}
- if (ac->instance_type) {
- ldb_msg_remove_attr(ares->message, "instanceType");
+ for (i=0; i < msg->num_elements; i++) {
+ if (!aclread_is_inaccessible(&msg->elements[i])) {
+ num_of_attrs++;
+ }
}
- if (ac->object_sid) {
- ldb_msg_remove_attr(ares->message, "objectSid");
+ /*create a new message to return*/
+ ret_msg = ldb_msg_new(req);
+ ret_msg->dn = msg->dn;
+ ret_msg->num_elements = num_of_attrs;
+ if (num_of_attrs > 0) {
+ ret_msg->elements = talloc_array(ret_msg,
+ struct ldb_message_element,
+ num_of_attrs);
+ if (ret_msg->elements == NULL) {
+ return ldb_oom(ldb);
+ }
+ for (i=0; i < msg->num_elements; i++) {
+ bool to_remove = aclread_is_inaccessible(&msg->elements[i]);
+ if (!to_remove) {
+ ret_msg->elements[k] = msg->elements[i];
+ if (!talloc_reference(ret_msg->elements,
+ msg->elements[i].values)) {
+ talloc_free(tmp_ctx);
+ return ldb_operr(ldb);
+ }
+ k++;
+ }
+ }
+ } else {
+ ret_msg->elements = NULL;
}
talloc_free(tmp_ctx);
- return ldb_module_send_entry(ac->req, ares->message, ares->controls);
+
+ return ldb_module_send_entry(ac->req, ret_msg, ares->controls);
case LDB_REPLY_REFERRAL:
return ldb_module_send_referral(ac->req, ares->referral);
case LDB_REPLY_DONE:
diff --git a/source4/lib/ldb/include/ldb_module.h b/source4/lib/ldb/include/ldb_module.h
index 50c606b..a6a4d16 100644
--- a/source4/lib/ldb/include/ldb_module.h
+++ b/source4/lib/ldb/include/ldb_module.h
@@ -46,6 +46,9 @@ struct ldb_module;
/* disable any single value checking on this attribute */
#define LDB_FLAG_INTERNAL_DISABLE_SINGLE_VALUE_CHECK 0x20
+/* attribute has failed access check and must not be exposed */
+#define LDB_FLAG_INTERNAL_INACCESSIBLE_ATTRIBUTE 0x30
+
/*
these function pointers define the operations that a ldb module can intercept
--
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