mirror of
https://github.com/samba-team/samba.git
synced 2024-12-22 13:34:15 +03:00
5cf3b0bba4
Guenther
712 lines
19 KiB
C
712 lines
19 KiB
C
/*
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* Unix SMB/Netbios implementation.
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* SEC_DESC 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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#define ALL_SECURITY_INFORMATION (SECINFO_OWNER|SECINFO_GROUP|\
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SECINFO_DACL|SECINFO_SACL|\
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SECINFO_UNPROTECTED_SACL|\
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SECINFO_UNPROTECTED_DACL|\
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SECINFO_PROTECTED_SACL|\
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SECINFO_PROTECTED_DACL)
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/* Map generic permissions to file object specific permissions */
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const struct generic_mapping file_generic_mapping = {
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FILE_GENERIC_READ,
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FILE_GENERIC_WRITE,
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FILE_GENERIC_EXECUTE,
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FILE_GENERIC_ALL
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};
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/*******************************************************************
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Given a security_descriptor return the sec_info.
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********************************************************************/
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uint32_t get_sec_info(const struct security_descriptor *sd)
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{
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uint32_t sec_info = ALL_SECURITY_INFORMATION;
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SMB_ASSERT(sd);
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if (sd->owner_sid == NULL) {
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sec_info &= ~SECINFO_OWNER;
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}
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if (sd->group_sid == NULL) {
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sec_info &= ~SECINFO_GROUP;
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}
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if (sd->sacl == NULL) {
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sec_info &= ~SECINFO_SACL;
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}
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if (sd->dacl == NULL) {
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sec_info &= ~SECINFO_DACL;
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}
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return sec_info;
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}
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/*******************************************************************
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Merge part of security descriptor old_sec in to the empty sections of
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security descriptor new_sec.
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********************************************************************/
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struct sec_desc_buf *sec_desc_merge_buf(TALLOC_CTX *ctx, struct sec_desc_buf *new_sdb, struct sec_desc_buf *old_sdb)
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{
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struct dom_sid *owner_sid, *group_sid;
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struct sec_desc_buf *return_sdb;
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struct security_acl *dacl, *sacl;
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struct security_descriptor *psd = NULL;
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uint16 secdesc_type;
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size_t secdesc_size;
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/* Copy over owner and group sids. There seems to be no flag for
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this so just check the pointer values. */
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owner_sid = new_sdb->sd->owner_sid ? new_sdb->sd->owner_sid :
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old_sdb->sd->owner_sid;
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group_sid = new_sdb->sd->group_sid ? new_sdb->sd->group_sid :
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old_sdb->sd->group_sid;
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secdesc_type = new_sdb->sd->type;
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/* Ignore changes to the system ACL. This has the effect of making
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changes through the security tab audit button not sticking.
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Perhaps in future Samba could implement these settings somehow. */
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sacl = NULL;
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secdesc_type &= ~SEC_DESC_SACL_PRESENT;
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/* Copy across discretionary ACL */
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if (secdesc_type & SEC_DESC_DACL_PRESENT) {
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dacl = new_sdb->sd->dacl;
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} else {
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dacl = old_sdb->sd->dacl;
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}
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/* Create new security descriptor from bits */
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psd = make_sec_desc(ctx, new_sdb->sd->revision, secdesc_type,
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owner_sid, group_sid, sacl, dacl, &secdesc_size);
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return_sdb = make_sec_desc_buf(ctx, secdesc_size, psd);
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return(return_sdb);
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}
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struct security_descriptor *sec_desc_merge(TALLOC_CTX *ctx, struct security_descriptor *new_sdb, struct security_descriptor *old_sdb)
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{
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struct dom_sid *owner_sid, *group_sid;
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struct security_acl *dacl, *sacl;
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struct security_descriptor *psd = NULL;
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uint16 secdesc_type;
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size_t secdesc_size;
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/* Copy over owner and group sids. There seems to be no flag for
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this so just check the pointer values. */
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owner_sid = new_sdb->owner_sid ? new_sdb->owner_sid :
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old_sdb->owner_sid;
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group_sid = new_sdb->group_sid ? new_sdb->group_sid :
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old_sdb->group_sid;
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secdesc_type = new_sdb->type;
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/* Ignore changes to the system ACL. This has the effect of making
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changes through the security tab audit button not sticking.
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Perhaps in future Samba could implement these settings somehow. */
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sacl = NULL;
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secdesc_type &= ~SEC_DESC_SACL_PRESENT;
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/* Copy across discretionary ACL */
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if (secdesc_type & SEC_DESC_DACL_PRESENT) {
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dacl = new_sdb->dacl;
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} else {
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dacl = old_sdb->dacl;
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}
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/* Create new security descriptor from bits */
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psd = make_sec_desc(ctx, new_sdb->revision, secdesc_type,
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owner_sid, group_sid, sacl, dacl, &secdesc_size);
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return psd;
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}
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/*******************************************************************
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Creates a struct security_descriptor structure
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********************************************************************/
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#define SEC_DESC_HEADER_SIZE (2 * sizeof(uint16) + 4 * sizeof(uint32))
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struct security_descriptor *make_sec_desc(TALLOC_CTX *ctx,
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enum security_descriptor_revision revision,
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uint16 type,
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const struct dom_sid *owner_sid, const struct dom_sid *grp_sid,
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struct security_acl *sacl, struct security_acl *dacl, size_t *sd_size)
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{
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struct security_descriptor *dst;
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uint32 offset = 0;
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*sd_size = 0;
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if(( dst = TALLOC_ZERO_P(ctx, struct security_descriptor)) == NULL)
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return NULL;
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dst->revision = revision;
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dst->type = type;
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if (sacl)
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dst->type |= SEC_DESC_SACL_PRESENT;
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if (dacl)
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dst->type |= SEC_DESC_DACL_PRESENT;
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dst->owner_sid = NULL;
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dst->group_sid = NULL;
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dst->sacl = NULL;
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dst->dacl = NULL;
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if(owner_sid && ((dst->owner_sid = sid_dup_talloc(dst,owner_sid)) == NULL))
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goto error_exit;
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if(grp_sid && ((dst->group_sid = sid_dup_talloc(dst,grp_sid)) == NULL))
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goto error_exit;
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if(sacl && ((dst->sacl = dup_sec_acl(dst, sacl)) == NULL))
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goto error_exit;
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if(dacl && ((dst->dacl = dup_sec_acl(dst, dacl)) == NULL))
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goto error_exit;
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offset = SEC_DESC_HEADER_SIZE;
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/*
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* Work out the linearization sizes.
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*/
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if (dst->sacl != NULL) {
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offset += dst->sacl->size;
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}
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if (dst->dacl != NULL) {
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offset += dst->dacl->size;
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}
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if (dst->owner_sid != NULL) {
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offset += ndr_size_dom_sid(dst->owner_sid, 0);
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}
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if (dst->group_sid != NULL) {
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offset += ndr_size_dom_sid(dst->group_sid, 0);
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}
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*sd_size = (size_t)offset;
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return dst;
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error_exit:
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*sd_size = 0;
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return NULL;
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}
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/*******************************************************************
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Duplicate a struct security_descriptor structure.
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********************************************************************/
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struct security_descriptor *dup_sec_desc(TALLOC_CTX *ctx, const struct security_descriptor *src)
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{
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size_t dummy;
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if(src == NULL)
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return NULL;
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return make_sec_desc( ctx, src->revision, src->type,
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src->owner_sid, src->group_sid, src->sacl,
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src->dacl, &dummy);
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}
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/*******************************************************************
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Convert a secdesc into a byte stream
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********************************************************************/
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NTSTATUS marshall_sec_desc(TALLOC_CTX *mem_ctx,
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struct security_descriptor *secdesc,
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uint8 **data, size_t *len)
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{
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DATA_BLOB blob;
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enum ndr_err_code ndr_err;
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ndr_err = ndr_push_struct_blob(
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&blob, mem_ctx, secdesc,
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(ndr_push_flags_fn_t)ndr_push_security_descriptor);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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DEBUG(0, ("ndr_push_security_descriptor failed: %s\n",
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ndr_errstr(ndr_err)));
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return ndr_map_error2ntstatus(ndr_err);;
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}
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*data = blob.data;
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*len = blob.length;
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return NT_STATUS_OK;
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}
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/*******************************************************************
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Convert a secdesc_buf into a byte stream
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********************************************************************/
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NTSTATUS marshall_sec_desc_buf(TALLOC_CTX *mem_ctx,
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struct sec_desc_buf *secdesc_buf,
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uint8_t **data, size_t *len)
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{
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DATA_BLOB blob;
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enum ndr_err_code ndr_err;
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ndr_err = ndr_push_struct_blob(
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&blob, mem_ctx, secdesc_buf,
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(ndr_push_flags_fn_t)ndr_push_sec_desc_buf);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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DEBUG(0, ("ndr_push_sec_desc_buf failed: %s\n",
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ndr_errstr(ndr_err)));
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return ndr_map_error2ntstatus(ndr_err);;
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}
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*data = blob.data;
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*len = blob.length;
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return NT_STATUS_OK;
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}
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/*******************************************************************
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Parse a byte stream into a secdesc
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********************************************************************/
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NTSTATUS unmarshall_sec_desc(TALLOC_CTX *mem_ctx, uint8 *data, size_t len,
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struct security_descriptor **psecdesc)
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{
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DATA_BLOB blob;
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enum ndr_err_code ndr_err;
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struct security_descriptor *result;
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if ((data == NULL) || (len == 0)) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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result = TALLOC_ZERO_P(mem_ctx, struct security_descriptor);
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if (result == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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blob = data_blob_const(data, len);
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ndr_err = ndr_pull_struct_blob(&blob, result, result,
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(ndr_pull_flags_fn_t)ndr_pull_security_descriptor);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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DEBUG(0, ("ndr_pull_security_descriptor failed: %s\n",
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ndr_errstr(ndr_err)));
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TALLOC_FREE(result);
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return ndr_map_error2ntstatus(ndr_err);;
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}
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*psecdesc = result;
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return NT_STATUS_OK;
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}
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/*******************************************************************
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Parse a byte stream into a sec_desc_buf
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********************************************************************/
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NTSTATUS unmarshall_sec_desc_buf(TALLOC_CTX *mem_ctx, uint8_t *data, size_t len,
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struct sec_desc_buf **psecdesc_buf)
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{
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DATA_BLOB blob;
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enum ndr_err_code ndr_err;
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struct sec_desc_buf *result;
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if ((data == NULL) || (len == 0)) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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result = TALLOC_ZERO_P(mem_ctx, struct sec_desc_buf);
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if (result == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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blob = data_blob_const(data, len);
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ndr_err = ndr_pull_struct_blob(&blob, result, result,
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(ndr_pull_flags_fn_t)ndr_pull_sec_desc_buf);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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DEBUG(0, ("ndr_pull_sec_desc_buf failed: %s\n",
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ndr_errstr(ndr_err)));
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TALLOC_FREE(result);
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return ndr_map_error2ntstatus(ndr_err);;
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}
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*psecdesc_buf = result;
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return NT_STATUS_OK;
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}
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/*******************************************************************
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Creates a struct security_descriptor structure with typical defaults.
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********************************************************************/
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struct security_descriptor *make_standard_sec_desc(TALLOC_CTX *ctx, const struct dom_sid *owner_sid, const struct dom_sid *grp_sid,
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struct security_acl *dacl, size_t *sd_size)
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{
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return make_sec_desc(ctx, SECURITY_DESCRIPTOR_REVISION_1,
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SEC_DESC_SELF_RELATIVE, owner_sid, grp_sid, NULL,
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dacl, sd_size);
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}
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/*******************************************************************
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Creates a struct sec_desc_buf structure.
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********************************************************************/
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struct sec_desc_buf *make_sec_desc_buf(TALLOC_CTX *ctx, size_t len, struct security_descriptor *sec_desc)
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{
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struct sec_desc_buf *dst;
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if((dst = TALLOC_ZERO_P(ctx, struct sec_desc_buf)) == NULL)
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return NULL;
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/* max buffer size (allocated size) */
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dst->sd_size = (uint32)len;
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if(sec_desc && ((dst->sd = dup_sec_desc(ctx, sec_desc)) == NULL)) {
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return NULL;
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}
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return dst;
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}
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/*******************************************************************
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Duplicates a struct sec_desc_buf structure.
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********************************************************************/
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struct sec_desc_buf *dup_sec_desc_buf(TALLOC_CTX *ctx, struct sec_desc_buf *src)
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{
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if(src == NULL)
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return NULL;
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return make_sec_desc_buf( ctx, src->sd_size, src->sd);
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}
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/*******************************************************************
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Add a new SID with its permissions to struct security_descriptor.
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********************************************************************/
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NTSTATUS sec_desc_add_sid(TALLOC_CTX *ctx, struct security_descriptor **psd, struct dom_sid *sid, uint32 mask, size_t *sd_size)
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{
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struct security_descriptor *sd = 0;
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struct security_acl *dacl = 0;
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struct security_ace *ace = 0;
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NTSTATUS status;
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if (!ctx || !psd || !sid || !sd_size)
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return NT_STATUS_INVALID_PARAMETER;
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*sd_size = 0;
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status = sec_ace_add_sid(ctx, &ace, psd[0]->dacl->aces, &psd[0]->dacl->num_aces, sid, mask);
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if (!NT_STATUS_IS_OK(status))
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return status;
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if (!(dacl = make_sec_acl(ctx, psd[0]->dacl->revision, psd[0]->dacl->num_aces, ace)))
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return NT_STATUS_UNSUCCESSFUL;
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if (!(sd = make_sec_desc(ctx, psd[0]->revision, psd[0]->type, psd[0]->owner_sid,
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psd[0]->group_sid, psd[0]->sacl, dacl, sd_size)))
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return NT_STATUS_UNSUCCESSFUL;
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*psd = sd;
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sd = 0;
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return NT_STATUS_OK;
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}
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/*******************************************************************
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Modify a SID's permissions in a struct security_descriptor.
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********************************************************************/
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NTSTATUS sec_desc_mod_sid(struct security_descriptor *sd, struct dom_sid *sid, uint32 mask)
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{
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NTSTATUS status;
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if (!sd || !sid)
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return NT_STATUS_INVALID_PARAMETER;
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status = sec_ace_mod_sid(sd->dacl->aces, sd->dacl->num_aces, sid, mask);
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if (!NT_STATUS_IS_OK(status))
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return status;
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return NT_STATUS_OK;
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}
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/*******************************************************************
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Delete a SID from a struct security_descriptor.
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********************************************************************/
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NTSTATUS sec_desc_del_sid(TALLOC_CTX *ctx, struct security_descriptor **psd, struct dom_sid *sid, size_t *sd_size)
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{
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struct security_descriptor *sd = 0;
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struct security_acl *dacl = 0;
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struct security_ace *ace = 0;
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NTSTATUS status;
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if (!ctx || !psd[0] || !sid || !sd_size)
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return NT_STATUS_INVALID_PARAMETER;
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*sd_size = 0;
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status = sec_ace_del_sid(ctx, &ace, psd[0]->dacl->aces, &psd[0]->dacl->num_aces, sid);
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if (!NT_STATUS_IS_OK(status))
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return status;
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if (!(dacl = make_sec_acl(ctx, psd[0]->dacl->revision, psd[0]->dacl->num_aces, ace)))
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return NT_STATUS_UNSUCCESSFUL;
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if (!(sd = make_sec_desc(ctx, psd[0]->revision, psd[0]->type, psd[0]->owner_sid,
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psd[0]->group_sid, psd[0]->sacl, dacl, sd_size)))
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return NT_STATUS_UNSUCCESSFUL;
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*psd = sd;
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sd = 0;
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return NT_STATUS_OK;
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}
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/*
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* Determine if an struct security_ace is inheritable
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*/
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static bool is_inheritable_ace(const struct security_ace *ace,
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bool container)
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{
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if (!container) {
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return ((ace->flags & SEC_ACE_FLAG_OBJECT_INHERIT) != 0);
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}
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if (ace->flags & SEC_ACE_FLAG_CONTAINER_INHERIT) {
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return true;
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}
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if ((ace->flags & SEC_ACE_FLAG_OBJECT_INHERIT) &&
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!(ace->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT)) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Does a security descriptor have any inheritable components for
|
|
* the newly created type ?
|
|
*/
|
|
|
|
bool sd_has_inheritable_components(const struct security_descriptor *parent_ctr, bool container)
|
|
{
|
|
unsigned int i;
|
|
const struct security_acl *the_acl = parent_ctr->dacl;
|
|
|
|
for (i = 0; i < the_acl->num_aces; i++) {
|
|
const struct security_ace *ace = &the_acl->aces[i];
|
|
|
|
if (is_inheritable_ace(ace, container)) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/* Create a child security descriptor using another security descriptor as
|
|
the parent container. This child object can either be a container or
|
|
non-container object. */
|
|
|
|
NTSTATUS se_create_child_secdesc(TALLOC_CTX *ctx,
|
|
struct security_descriptor **ppsd,
|
|
size_t *psize,
|
|
const struct security_descriptor *parent_ctr,
|
|
const struct dom_sid *owner_sid,
|
|
const struct dom_sid *group_sid,
|
|
bool container)
|
|
{
|
|
struct security_acl *new_dacl = NULL, *the_acl = NULL;
|
|
struct security_ace *new_ace_list = NULL;
|
|
unsigned int new_ace_list_ndx = 0, i;
|
|
|
|
*ppsd = NULL;
|
|
*psize = 0;
|
|
|
|
/* Currently we only process the dacl when creating the child. The
|
|
sacl should also be processed but this is left out as sacls are
|
|
not implemented in Samba at the moment.*/
|
|
|
|
the_acl = parent_ctr->dacl;
|
|
|
|
if (the_acl->num_aces) {
|
|
if (2*the_acl->num_aces < the_acl->num_aces) {
|
|
return NT_STATUS_NO_MEMORY;
|
|
}
|
|
|
|
if (!(new_ace_list = TALLOC_ARRAY(ctx, struct security_ace,
|
|
2*the_acl->num_aces))) {
|
|
return NT_STATUS_NO_MEMORY;
|
|
}
|
|
} else {
|
|
new_ace_list = NULL;
|
|
}
|
|
|
|
for (i = 0; i < the_acl->num_aces; i++) {
|
|
const struct security_ace *ace = &the_acl->aces[i];
|
|
struct security_ace *new_ace = &new_ace_list[new_ace_list_ndx];
|
|
const struct dom_sid *ptrustee = &ace->trustee;
|
|
const struct dom_sid *creator = NULL;
|
|
uint8 new_flags = ace->flags;
|
|
|
|
if (!is_inheritable_ace(ace, container)) {
|
|
continue;
|
|
}
|
|
|
|
/* see the RAW-ACLS inheritance test for details on these rules */
|
|
if (!container) {
|
|
new_flags = 0;
|
|
} else {
|
|
new_flags &= ~SEC_ACE_FLAG_INHERIT_ONLY;
|
|
|
|
if (!(new_flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
|
|
new_flags |= SEC_ACE_FLAG_INHERIT_ONLY;
|
|
}
|
|
if (new_flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
|
|
new_flags = 0;
|
|
}
|
|
}
|
|
|
|
/* The CREATOR sids are special when inherited */
|
|
if (sid_equal(ptrustee, &global_sid_Creator_Owner)) {
|
|
creator = &global_sid_Creator_Owner;
|
|
ptrustee = owner_sid;
|
|
} else if (sid_equal(ptrustee, &global_sid_Creator_Group)) {
|
|
creator = &global_sid_Creator_Group;
|
|
ptrustee = group_sid;
|
|
}
|
|
|
|
if (creator && container &&
|
|
(new_flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
|
|
|
|
/* First add the regular ACE entry. */
|
|
init_sec_ace(new_ace, ptrustee, ace->type,
|
|
ace->access_mask, 0);
|
|
|
|
DEBUG(5,("se_create_child_secdesc(): %s:%d/0x%02x/0x%08x"
|
|
" inherited as %s:%d/0x%02x/0x%08x\n",
|
|
sid_string_dbg(&ace->trustee),
|
|
ace->type, ace->flags, ace->access_mask,
|
|
sid_string_dbg(&new_ace->trustee),
|
|
new_ace->type, new_ace->flags,
|
|
new_ace->access_mask));
|
|
|
|
new_ace_list_ndx++;
|
|
|
|
/* Now add the extra creator ACE. */
|
|
new_ace = &new_ace_list[new_ace_list_ndx];
|
|
|
|
ptrustee = creator;
|
|
new_flags |= SEC_ACE_FLAG_INHERIT_ONLY;
|
|
} else if (container &&
|
|
!(ace->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT)) {
|
|
ptrustee = &ace->trustee;
|
|
}
|
|
|
|
init_sec_ace(new_ace, ptrustee, ace->type,
|
|
ace->access_mask, new_flags);
|
|
|
|
DEBUG(5, ("se_create_child_secdesc(): %s:%d/0x%02x/0x%08x "
|
|
" inherited as %s:%d/0x%02x/0x%08x\n",
|
|
sid_string_dbg(&ace->trustee),
|
|
ace->type, ace->flags, ace->access_mask,
|
|
sid_string_dbg(&ace->trustee),
|
|
new_ace->type, new_ace->flags,
|
|
new_ace->access_mask));
|
|
|
|
new_ace_list_ndx++;
|
|
}
|
|
|
|
/* Create child security descriptor to return */
|
|
if (new_ace_list_ndx) {
|
|
new_dacl = make_sec_acl(ctx,
|
|
NT4_ACL_REVISION,
|
|
new_ace_list_ndx,
|
|
new_ace_list);
|
|
|
|
if (!new_dacl) {
|
|
return NT_STATUS_NO_MEMORY;
|
|
}
|
|
}
|
|
|
|
*ppsd = make_sec_desc(ctx,
|
|
SECURITY_DESCRIPTOR_REVISION_1,
|
|
SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
|
|
owner_sid,
|
|
group_sid,
|
|
NULL,
|
|
new_dacl,
|
|
psize);
|
|
if (!*ppsd) {
|
|
return NT_STATUS_NO_MEMORY;
|
|
}
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
NTSTATUS se_create_child_secdesc_buf(TALLOC_CTX *ctx,
|
|
struct sec_desc_buf **ppsdb,
|
|
const struct security_descriptor *parent_ctr,
|
|
bool container)
|
|
{
|
|
NTSTATUS status;
|
|
size_t size = 0;
|
|
struct security_descriptor *sd = NULL;
|
|
|
|
*ppsdb = NULL;
|
|
status = se_create_child_secdesc(ctx,
|
|
&sd,
|
|
&size,
|
|
parent_ctr,
|
|
parent_ctr->owner_sid,
|
|
parent_ctr->group_sid,
|
|
container);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return status;
|
|
}
|
|
|
|
*ppsdb = make_sec_desc_buf(ctx, size, sd);
|
|
if (!*ppsdb) {
|
|
return NT_STATUS_NO_MEMORY;
|
|
}
|
|
return NT_STATUS_OK;
|
|
}
|