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b69bec03cc
Jeremy
281 lines
8.3 KiB
C
281 lines
8.3 KiB
C
/*
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* Unix SMB/Netbios implementation.
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* struct security_ace handling functions
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* Copyright (C) Andrew Tridgell 1992-1998,
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* Copyright (C) Jeremy R. Allison 1995-2003.
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* Copyright (C) Luke Kenneth Casson Leighton 1996-1998,
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* Copyright (C) Paul Ashton 1997-1998.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "librpc/gen_ndr/ndr_security.h"
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#include "libcli/security/dom_sid.h"
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#include "lib/util/tsort.h"
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#define SEC_ACE_HEADER_SIZE (2 * sizeof(uint8_t) + sizeof(uint16_t) + sizeof(uint32_t))
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/**
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* Check if ACE has OBJECT type.
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*/
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bool sec_ace_object(uint8_t type)
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{
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if (type == SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT ||
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type == SEC_ACE_TYPE_ACCESS_DENIED_OBJECT ||
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type == SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT ||
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type == SEC_ACE_TYPE_SYSTEM_ALARM_OBJECT) {
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return true;
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}
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return false;
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}
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/**
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* copy a struct security_ace structure.
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*/
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void sec_ace_copy(struct security_ace *ace_dest, const struct security_ace *ace_src)
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{
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ace_dest->type = ace_src->type;
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ace_dest->flags = ace_src->flags;
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ace_dest->size = ace_src->size;
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ace_dest->access_mask = ace_src->access_mask;
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ace_dest->object = ace_src->object;
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ace_dest->trustee = ace_src->trustee;
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}
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/*******************************************************************
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Sets up a struct security_ace structure.
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********************************************************************/
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void init_sec_ace(struct security_ace *t, const struct dom_sid *sid, enum security_ace_type type,
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uint32_t mask, uint8_t flag)
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{
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t->type = type;
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t->flags = flag;
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t->size = ndr_size_dom_sid(sid, 0) + 8;
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t->access_mask = mask;
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t->trustee = *sid;
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}
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/*******************************************************************
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adds new SID with its permissions to ACE list
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********************************************************************/
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NTSTATUS sec_ace_add_sid(TALLOC_CTX *ctx, struct security_ace **pp_new, struct security_ace *old, unsigned *num, const struct dom_sid *sid, uint32_t mask)
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{
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unsigned int i = 0;
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if (!ctx || !pp_new || !old || !sid || !num) return NT_STATUS_INVALID_PARAMETER;
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*num += 1;
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if((pp_new[0] = talloc_zero_array(ctx, struct security_ace, *num )) == 0)
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return NT_STATUS_NO_MEMORY;
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for (i = 0; i < *num - 1; i ++)
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sec_ace_copy(&(*pp_new)[i], &old[i]);
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(*pp_new)[i].type = SEC_ACE_TYPE_ACCESS_ALLOWED;
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(*pp_new)[i].flags = 0;
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(*pp_new)[i].size = SEC_ACE_HEADER_SIZE + ndr_size_dom_sid(sid, 0);
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(*pp_new)[i].access_mask = mask;
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(*pp_new)[i].trustee = *sid;
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return NT_STATUS_OK;
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}
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/*******************************************************************
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modify SID's permissions at ACL
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********************************************************************/
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NTSTATUS sec_ace_mod_sid(struct security_ace *ace, size_t num, const struct dom_sid *sid, uint32_t mask)
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{
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unsigned int i = 0;
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if (!ace || !sid) return NT_STATUS_INVALID_PARAMETER;
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for (i = 0; i < num; i ++) {
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if (dom_sid_equal(&ace[i].trustee, sid)) {
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ace[i].access_mask = mask;
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return NT_STATUS_OK;
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}
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}
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return NT_STATUS_NOT_FOUND;
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}
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/*******************************************************************
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delete SID from ACL
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********************************************************************/
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NTSTATUS sec_ace_del_sid(TALLOC_CTX *ctx, struct security_ace **pp_new, struct security_ace *old, uint32_t *num, const struct dom_sid *sid)
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{
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unsigned int i = 0;
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unsigned int n_del = 0;
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if (!ctx || !pp_new || !old || !sid || !num) return NT_STATUS_INVALID_PARAMETER;
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if (*num) {
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if((pp_new[0] = talloc_zero_array(ctx, struct security_ace, *num )) == 0)
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return NT_STATUS_NO_MEMORY;
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} else {
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pp_new[0] = NULL;
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}
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for (i = 0; i < *num; i ++) {
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if (!dom_sid_equal(&old[i].trustee, sid))
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sec_ace_copy(&(*pp_new)[i], &old[i]);
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else
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n_del ++;
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}
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if (n_del == 0)
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return NT_STATUS_NOT_FOUND;
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else {
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*num -= n_del;
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return NT_STATUS_OK;
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}
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}
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/*******************************************************************
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Compares two struct security_ace structures
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********************************************************************/
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bool sec_ace_equal(const struct security_ace *s1, const struct security_ace *s2)
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{
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/* Trivial case */
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if (!s1 && !s2) {
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return true;
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}
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if (!s1 || !s2) {
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return false;
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}
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/* Check top level stuff */
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if (s1->type != s2->type || s1->flags != s2->flags ||
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s1->access_mask != s2->access_mask) {
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return false;
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}
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/* Check SID */
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if (!dom_sid_equal(&s1->trustee, &s2->trustee)) {
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return false;
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}
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return true;
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}
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int nt_ace_inherit_comp(const struct security_ace *a1, const struct security_ace *a2)
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{
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int a1_inh = a1->flags & SEC_ACE_FLAG_INHERITED_ACE;
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int a2_inh = a2->flags & SEC_ACE_FLAG_INHERITED_ACE;
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if (a1_inh == a2_inh)
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return 0;
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if (!a1_inh && a2_inh)
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return -1;
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return 1;
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}
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/*******************************************************************
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Comparison function to apply the order explained below in a group.
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*******************************************************************/
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int nt_ace_canon_comp( const struct security_ace *a1, const struct security_ace *a2)
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{
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if ((a1->type == SEC_ACE_TYPE_ACCESS_DENIED) &&
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(a2->type != SEC_ACE_TYPE_ACCESS_DENIED))
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return -1;
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if ((a2->type == SEC_ACE_TYPE_ACCESS_DENIED) &&
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(a1->type != SEC_ACE_TYPE_ACCESS_DENIED))
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return 1;
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/* Both access denied or access allowed. */
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/* 1. ACEs that apply to the object itself */
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if (!(a1->flags & SEC_ACE_FLAG_INHERIT_ONLY) &&
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(a2->flags & SEC_ACE_FLAG_INHERIT_ONLY))
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return -1;
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else if (!(a2->flags & SEC_ACE_FLAG_INHERIT_ONLY) &&
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(a1->flags & SEC_ACE_FLAG_INHERIT_ONLY))
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return 1;
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/* 2. ACEs that apply to a subobject of the object, such as
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* a property set or property. */
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if (a1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT) &&
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!(a2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT)))
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return -1;
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else if (a2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT) &&
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!(a1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT)))
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return 1;
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return 0;
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}
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/*******************************************************************
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Functions to convert a SEC_DESC ACE DACL list into canonical order.
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JRA.
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--- from http://msdn.microsoft.com/library/default.asp?url=/library/en-us/security/security/order_of_aces_in_a_dacl.asp
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The following describes the preferred order:
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To ensure that noninherited ACEs have precedence over inherited ACEs,
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place all noninherited ACEs in a group before any inherited ACEs.
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This ordering ensures, for example, that a noninherited access-denied ACE
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is enforced regardless of any inherited ACE that allows access.
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Within the groups of noninherited ACEs and inherited ACEs, order ACEs according to ACE type, as the following shows:
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1. Access-denied ACEs that apply to the object itself
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2. Access-denied ACEs that apply to a subobject of the object, such as a property set or property
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3. Access-allowed ACEs that apply to the object itself
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4. Access-allowed ACEs that apply to a subobject of the object"
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********************************************************************/
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void dacl_sort_into_canonical_order(struct security_ace *srclist, unsigned int num_aces)
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{
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unsigned int i;
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if (!srclist || num_aces == 0)
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return;
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/* Sort so that non-inherited ACE's come first. */
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TYPESAFE_QSORT(srclist, num_aces, nt_ace_inherit_comp);
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/* Find the boundary between non-inherited ACEs. */
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for (i = 0; i < num_aces; i++ ) {
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struct security_ace *curr_ace = &srclist[i];
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if (curr_ace->flags & SEC_ACE_FLAG_INHERITED_ACE)
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break;
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}
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/* i now points at entry number of the first inherited ACE. */
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/* Sort the non-inherited ACEs. */
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TYPESAFE_QSORT(srclist, i, nt_ace_canon_comp);
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/* Now sort the inherited ACEs. */
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TYPESAFE_QSORT(&srclist[i], num_aces - i, nt_ace_canon_comp);
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}
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