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-rw-r--r--source4/dsdb/samdb/ldb_modules/acl.c241
-rwxr-xr-xsource4/dsdb/tests/python/acl.py70
2 files changed, 226 insertions, 85 deletions
diff --git a/source4/dsdb/samdb/ldb_modules/acl.c b/source4/dsdb/samdb/ldb_modules/acl.c
index e823b1eada..d0e1c90746 100644
--- a/source4/dsdb/samdb/ldb_modules/acl.c
+++ b/source4/dsdb/samdb/ldb_modules/acl.c
@@ -259,8 +259,10 @@ static int acl_check_access_on_attribute(struct ldb_module *module,
else {
ret = LDB_SUCCESS;
}
+ talloc_free(tmp_ctx);
return ret;
fail:
+ talloc_free(tmp_ctx);
return LDB_ERR_OPERATIONS_ERROR;
}
@@ -655,49 +657,46 @@ static int acl_add(struct ldb_module *module, struct ldb_request *req)
}
/* checks for validated writes */
-static int acl_check_self_write(struct ldb_request *req,
- struct security_descriptor *sd,
- struct security_token *token,
- const char *self_write,
- struct dom_sid *sid)
+static int acl_check_extended_right(TALLOC_CTX *mem_ctx,
+ struct security_descriptor *sd,
+ struct security_token *token,
+ const char *ext_right,
+ uint32_t right_type,
+ struct dom_sid *sid)
{
struct GUID right;
NTSTATUS status;
uint32_t access_granted;
struct object_tree *root = NULL;
struct object_tree *new_node = NULL;
- TALLOC_CTX *tmp_ctx = talloc_new(req);
+ TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
- GUID_from_string(self_write, &right);
+ GUID_from_string(ext_right, &right);
- if (!insert_in_object_tree(tmp_ctx, &right, SEC_ADS_SELF_WRITE,
+ if (!insert_in_object_tree(tmp_ctx, &right, right_type,
&root, &new_node)) {
- DEBUG(10, ("acl_modify: cannot add to object tree\n"));
+ DEBUG(10, ("acl_ext_right: cannot add to object tree\n"));
talloc_free(tmp_ctx);
return LDB_ERR_OPERATIONS_ERROR;
}
status = sec_access_check_ds(sd, token,
- SEC_ADS_SELF_WRITE,
+ right_type,
&access_granted,
root,
sid);
if (!NT_STATUS_IS_OK(status)) {
- DEBUG(10, ("Object %s has no self membershipself write right\n",
- ldb_dn_get_linearized(req->op.mod.message->dn)));
- dsdb_acl_debug(sd, token,
- req->op.mod.message->dn,
- true,
- 10);
talloc_free(tmp_ctx);
return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
}
-
+ talloc_free(tmp_ctx);
return LDB_SUCCESS;
}
+
/* ckecks if modifications are allowed on "Member" attribute */
-static int acl_check_self_membership(struct ldb_module *module,
+static int acl_check_self_membership(TALLOC_CTX *mem_ctx,
+ struct ldb_module *module,
struct ldb_request *req,
struct security_descriptor *sd,
struct dom_sid *sid,
@@ -706,13 +705,12 @@ static int acl_check_self_membership(struct ldb_module *module,
{
int ret;
unsigned int i;
- TALLOC_CTX *tmp_ctx = talloc_new(req);
struct ldb_context *ldb = ldb_module_get_ctx(module);
struct ldb_dn *user_dn;
struct ldb_message_element *member_el;
/* if we have wp, we can do whatever we like */
if (acl_check_access_on_attribute(module,
- req,
+ mem_ctx,
sd,
sid,
SEC_ADS_WRITE_PROP,
@@ -720,7 +718,7 @@ static int acl_check_self_membership(struct ldb_module *module,
return LDB_SUCCESS;
}
/* if we are adding/deleting ourselves, check for self membership */
- ret = dsdb_find_dn_by_sid(ldb, req, acl_user_token(module)->user_sid, &user_dn);
+ ret = dsdb_find_dn_by_sid(ldb, mem_ctx, acl_user_token(module)->user_sid, &user_dn);
if (ret != LDB_SUCCESS) {
return ret;
}
@@ -734,14 +732,86 @@ static int acl_check_self_membership(struct ldb_module *module,
}
for (i = 0; i < member_el->num_values; i++) {
if (strcasecmp((const char *)member_el->values[i].data,
- ldb_dn_get_extended_linearized(tmp_ctx, user_dn, 1)) != 0) {
+ ldb_dn_get_extended_linearized(mem_ctx, user_dn, 1)) != 0) {
return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
}
}
+ ret = acl_check_extended_right(mem_ctx, sd, acl_user_token(module),
+ GUID_DRS_SELF_MEMBERSHIP,
+ SEC_ADS_SELF_WRITE,
+ sid);
+ if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
+ dsdb_acl_debug(sd, acl_user_token(module),
+ req->op.mod.message->dn,
+ true,
+ 10);
+ }
+ return ret;
+}
+
+static int acl_check_password_rights(TALLOC_CTX *mem_ctx,
+ struct ldb_module *module,
+ struct ldb_request *req,
+ struct security_descriptor *sd,
+ struct dom_sid *sid,
+ const struct GUID *oc_guid)
+{
+ int ret = LDB_SUCCESS;
+ unsigned int del_attr_cnt = 0, add_attr_cnt = 0, rep_attr_cnt = 0;
+ struct ldb_message_element *el;
+ struct ldb_message *msg;
+ const char *passwordAttrs[] = { "userPassword", "unicodePwd",
+ "clearTextPassword", NULL }, **l;
+ TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
+
+ msg = ldb_msg_copy_shallow(tmp_ctx, req->op.mod.message);
+ if (msg == NULL) {
+ return LDB_ERR_OPERATIONS_ERROR;
+ }
+ for (l = passwordAttrs; *l != NULL; l++) {
+ while ((el = ldb_msg_find_element(msg, *l)) != NULL) {
+ if (el->flags == LDB_FLAG_MOD_DELETE) {
+ ++del_attr_cnt;
+ }
+ if (el->flags == LDB_FLAG_MOD_ADD) {
+ ++add_attr_cnt;
+ }
+ if (el->flags == LDB_FLAG_MOD_REPLACE) {
+ ++rep_attr_cnt;
+ }
+ ldb_msg_remove_element(msg, el);
+ }
+ }
+ /* a single delete will be handled by password hash
+ later in the stack, so we let it though here */
+ if (del_attr_cnt > 0 && add_attr_cnt == 0) {
+ talloc_free(tmp_ctx);
+ return LDB_SUCCESS;
+ }
+ if (rep_attr_cnt > 0 || (add_attr_cnt != del_attr_cnt)) {
+ ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
+ GUID_DRS_FORCE_CHANGE_PASSWORD,
+ SEC_ADS_CONTROL_ACCESS,
+ sid);
+ }
+ else if (add_attr_cnt == 1 && del_attr_cnt == 1) {
+ ret = acl_check_extended_right(tmp_ctx, sd, acl_user_token(module),
+ GUID_DRS_USER_CHANGE_PASSWORD,
+ SEC_ADS_CONTROL_ACCESS,
+ sid);
+ /* Very strange, but we get constraint violation in this case */
+ if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
+ ret = LDB_ERR_CONSTRAINT_VIOLATION;
+ }
+ }
+ if (ret != LDB_SUCCESS) {
+ dsdb_acl_debug(sd, acl_user_token(module),
+ req->op.mod.message->dn,
+ true,
+ 10);
+ }
talloc_free(tmp_ctx);
- return acl_check_self_write(req, sd, acl_user_token(module),
- GUID_DRS_SELF_MEMBERSHIP,
- sid);
+ return ret;
}
static int acl_modify(struct ldb_module *module, struct ldb_request *req)
@@ -750,7 +820,6 @@ static int acl_modify(struct ldb_module *module, struct ldb_request *req)
struct ldb_context *ldb = ldb_module_get_ctx(module);
const struct dsdb_schema *schema;
unsigned int i;
- bool modify_sd = false;
const struct GUID *guid;
uint32_t access_granted;
struct object_tree *root = NULL;
@@ -783,27 +852,27 @@ static int acl_modify(struct ldb_module *module, struct ldb_request *req)
if (ldb_dn_is_special(req->op.mod.message->dn)) {
return ldb_next_request(module, req);
}
- ret = dsdb_module_search_dn(module, req, &acl_res, req->op.mod.message->dn,
+ ret = dsdb_module_search_dn(module, tmp_ctx, &acl_res, req->op.mod.message->dn,
acl_attrs, 0);
if (ret != LDB_SUCCESS) {
- return ret;
+ goto fail;
}
- schema = dsdb_get_schema(ldb, acl_res);
+ schema = dsdb_get_schema(ldb, tmp_ctx);
if (!schema) {
- talloc_free(acl_res);
- return LDB_ERR_OPERATIONS_ERROR;
+ ret = LDB_ERR_OPERATIONS_ERROR;
+ goto fail;
}
- ret = dsdb_get_sd_from_ldb_message(req, acl_res->msgs[0], &sd);
+ ret = dsdb_get_sd_from_ldb_message(tmp_ctx, acl_res->msgs[0], &sd);
if (ret != LDB_SUCCESS) {
DEBUG(10, ("acl_modify: cannot get descriptor\n"));
- return ret;
+ goto fail;
}
/* Theoretically we pass the check if the object has no sd */
if (!sd) {
- return LDB_SUCCESS;
+ goto success;
}
guid = get_oc_guid_from_message(module, schema, acl_res->msgs[0]);
@@ -819,52 +888,84 @@ static int acl_modify(struct ldb_module *module, struct ldb_request *req)
}
for (i=0; i < req->op.mod.message->num_elements; i++){
const struct dsdb_attribute *attr;
- /* clearTextPassword is not in schema */
- if (ldb_attr_cmp("clearTextPassword", req->op.mod.message->elements[i].name) == 0) {
- attr = dsdb_attribute_by_lDAPDisplayName(schema, "unicodePwd");
- } else {
- attr = dsdb_attribute_by_lDAPDisplayName(schema,
+ attr = dsdb_attribute_by_lDAPDisplayName(schema,
req->op.mod.message->elements[i].name);
- }
-
- /* This basic attribute existence check with the right errorcode
- * is needed since this module is the first one which requests
- * schema attribute informations.
- * The complete attribute checking is done in the
- * "objectclass_attrs" module behind this one.
- */
- if (!attr) {
- ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' on entry '%s' was not found in the schema!",
- req->op.mod.message->elements[i].name,
- ldb_dn_get_linearized(req->op.mod.message->dn));
- talloc_free(tmp_ctx);
- return LDB_ERR_NO_SUCH_ATTRIBUTE;
- }
if (ldb_attr_cmp("nTSecurityDescriptor", req->op.mod.message->elements[i].name) == 0) {
- modify_sd = true;
+ status = sec_access_check_ds(sd, acl_user_token(module),
+ SEC_STD_WRITE_DAC,
+ &access_granted,
+ NULL,
+ sid);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(10, ("Object %s has no write dacl access\n",
+ ldb_dn_get_linearized(req->op.mod.message->dn)));
+ dsdb_acl_debug(sd,
+ acl_user_token(module),
+ req->op.mod.message->dn,
+ true,
+ 10);
+ ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
+ goto fail;
+ }
}
else if (ldb_attr_cmp("member", req->op.mod.message->elements[i].name) == 0) {
- ret = acl_check_self_membership(module,
+ ret = acl_check_self_membership(tmp_ctx,
+ module,
req,
sd,
sid,
guid,
attr);
if (ret != LDB_SUCCESS) {
- return ret;
+ goto fail;
+ }
+ }
+ else if (ldb_attr_cmp("dBCSPwd", req->op.mod.message->elements[i].name) == 0) {
+ /* this one is not affected by any rights, we should let it through
+ so that passwords_hash returns the correct error */
+ continue;
+ }
+ else if (ldb_attr_cmp("unicodePwd", req->op.mod.message->elements[i].name) == 0 ||
+ ldb_attr_cmp("userPassword", req->op.mod.message->elements[i].name) == 0 ||
+ ldb_attr_cmp("clearTextPassword", req->op.mod.message->elements[i].name) == 0) {
+ ret = acl_check_password_rights(tmp_ctx,
+ module,
+ req,
+ sd,
+ sid,
+ guid);
+ if (ret != LDB_SUCCESS) {
+ goto fail;
}
} else {
+
+ /* This basic attribute existence check with the right errorcode
+ * is needed since this module is the first one which requests
+ * schema attribute informations.
+ * The complete attribute checking is done in the
+ * "objectclass_attrs" module behind this one.
+ */
+ if (!attr) {
+ ldb_asprintf_errstring(ldb, "acl_modify: attribute '%s' on entry '%s' was not found in the schema!",
+ req->op.mod.message->elements[i].name,
+ ldb_dn_get_linearized(req->op.mod.message->dn));
+ ret = LDB_ERR_NO_SUCH_ATTRIBUTE;
+ goto fail;
+ }
if (!insert_in_object_tree(tmp_ctx,
&attr->attributeSecurityGUID, SEC_ADS_WRITE_PROP,
&new_node, &new_node)) {
DEBUG(10, ("acl_modify: cannot add to object tree securityGUID\n"));
+ ret = LDB_ERR_OPERATIONS_ERROR;
goto fail;
}
if (!insert_in_object_tree(tmp_ctx,
&attr->schemaIDGUID, SEC_ADS_WRITE_PROP, &new_node, &new_node)) {
DEBUG(10, ("acl_modify: cannot add to object tree attributeGUID\n"));
+ ret = LDB_ERR_OPERATIONS_ERROR;
goto fail;
}
}
@@ -885,35 +986,17 @@ static int acl_modify(struct ldb_module *module, struct ldb_request *req)
req->op.mod.message->dn,
true,
10);
- talloc_free(tmp_ctx);
- return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
- }
- }
- if (modify_sd) {
- status = sec_access_check_ds(sd, acl_user_token(module),
- SEC_STD_WRITE_DAC,
- &access_granted,
- NULL,
- sid);
-
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(10, ("Object %s has no write dacl access\n",
- ldb_dn_get_linearized(req->op.mod.message->dn)));
- dsdb_acl_debug(sd,
- acl_user_token(module),
- req->op.mod.message->dn,
- true,
- 10);
- talloc_free(tmp_ctx);
- return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
+ ret = LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
+ goto fail;
}
}
+success:
talloc_free(tmp_ctx);
return ldb_next_request(module, req);
fail:
talloc_free(tmp_ctx);
- return LDB_ERR_OPERATIONS_ERROR;
+ return ret;
}
/* similar to the modify for the time being.
diff --git a/source4/dsdb/tests/python/acl.py b/source4/dsdb/tests/python/acl.py
index 0f8fd0cdee..31bcd31ae2 100755
--- a/source4/dsdb/tests/python/acl.py
+++ b/source4/dsdb/tests/python/acl.py
@@ -15,7 +15,8 @@ samba.ensure_external_module("testtools", "testtools")
import samba.getopt as options
from ldb import (
- SCOPE_BASE, LdbError, ERR_NO_SUCH_OBJECT, ERR_INSUFFICIENT_ACCESS_RIGHTS)
+ SCOPE_BASE, LdbError, ERR_NO_SUCH_OBJECT,
+ ERR_UNWILLING_TO_PERFORM, ERR_INSUFFICIENT_ACCESS_RIGHTS)
from ldb import ERR_CONSTRAINT_VIOLATION
from ldb import Message, MessageElement, Dn
from ldb import FLAG_MOD_REPLACE, FLAG_MOD_DELETE
@@ -1077,7 +1078,7 @@ unicodePwd:: """ + base64.b64encode("\"thatsAcomplPASS2\"".encode('utf-16-le'))
desc = self.read_desc(self.get_user_dn(self.user_with_wp))
sddl = desc.as_sddl(self.domain_sid)
try:
- self.ldb_user2.modify_ldif("""
+ self.ldb_user.modify_ldif("""
dn: """ + self.get_user_dn(self.user_with_wp) + """
changetype: modify
delete: unicodePwd
@@ -1093,14 +1094,11 @@ unicodePwd:: """ + base64.b64encode("\"thatsAcomplPASS2\"".encode('utf-16-le'))
def test_change_password3(self):
"""Make sure WP has no influence"""
- desc = self.read_desc(self.get_user_dn(self.user_with_wp))
- sddl = desc.as_sddl(self.domain_sid)
- self.modify_desc(self.get_user_dn(self.user_with_wp), sddl)
mod = "(D;;WP;;;PS)"
self.dacl_add_ace(self.get_user_dn(self.user_with_wp), mod)
desc = self.read_desc(self.get_user_dn(self.user_with_wp))
sddl = desc.as_sddl(self.domain_sid)
- self.ldb_user2.modify_ldif("""
+ self.ldb_user.modify_ldif("""
dn: """ + self.get_user_dn(self.user_with_wp) + """
changetype: modify
delete: unicodePwd
@@ -1109,6 +1107,64 @@ add: unicodePwd
unicodePwd:: """ + base64.b64encode("\"thatsAcomplPASS2\"".encode('utf-16-le')) + """
""")
+ def test_change_password5(self):
+ """Make sure rights have no influence on dBCSPwd"""
+ desc = self.read_desc(self.get_user_dn(self.user_with_wp))
+ sddl = desc.as_sddl(self.domain_sid)
+ sddl = sddl.replace("(OA;;CR;ab721a53-1e2f-11d0-9819-00aa0040529b;;WD)", "")
+ sddl = sddl.replace("(OA;;CR;ab721a53-1e2f-11d0-9819-00aa0040529b;;PS)", "")
+ self.modify_desc(self.get_user_dn(self.user_with_wp), sddl)
+ mod = "(D;;WP;;;PS)"
+ self.dacl_add_ace(self.get_user_dn(self.user_with_wp), mod)
+ try:
+ self.ldb_user.modify_ldif("""
+dn: """ + self.get_user_dn(self.user_with_wp) + """
+changetype: modify
+delete: dBCSPwd
+dBCSPwd: XXXXXXXXXXXXXXXX
+add: dBCSPwd
+dBCSPwd: YYYYYYYYYYYYYYYY
+""")
+ except LdbError, (num, _):
+ self.assertEquals(num, ERR_UNWILLING_TO_PERFORM)
+ else:
+ self.fail()
+
+ def test_change_password6(self):
+ """Test uneven delete/adds"""
+ try:
+ self.ldb_user.modify_ldif("""
+dn: """ + self.get_user_dn(self.user_with_wp) + """
+changetype: modify
+delete: userPassword
+userPassword: thatsAcomplPASS1
+delete: userPassword
+userPassword: thatsAcomplPASS1
+add: userPassword
+userPassword: thatsAcomplPASS2
+""")
+ except LdbError, (num, _):
+ self.assertEquals(num, ERR_INSUFFICIENT_ACCESS_RIGHTS)
+ else:
+ self.fail()
+ mod = "(OA;;CR;00299570-246d-11d0-a768-00aa006e0529;;PS)"
+ self.dacl_add_ace(self.get_user_dn(self.user_with_wp), mod)
+ try:
+ self.ldb_user.modify_ldif("""
+dn: """ + self.get_user_dn(self.user_with_wp) + """
+changetype: modify
+delete: userPassword
+userPassword: thatsAcomplPASS1
+delete: userPassword
+userPassword: thatsAcomplPASS1
+add: userPassword
+userPassword: thatsAcomplPASS2
+""")
+ except LdbError, (num, _):
+ self.assertEquals(num, ERR_UNWILLING_TO_PERFORM)
+ else:
+ self.fail()
+
def test_reset_password1(self):
"""Try a user password reset operation (unicodePwd) before and after granting CAR"""
try:
@@ -1259,6 +1315,8 @@ if not runner.run(unittest.makeSuite(AclDeleteTests)).wasSuccessful():
rc = 1
if not runner.run(unittest.makeSuite(AclRenameTests)).wasSuccessful():
rc = 1
+if not runner.run(unittest.makeSuite(AclCARTests)).wasSuccessful():
+ rc = 1
# Reset the "dSHeuristics" as they were before
m = Message()
generated by cgit (git 2.34.1) at 2024-11-24 17:44:48 +0000