Blame src/acl/ntapi_acl_helper.c

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/********************************************************/
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/*  ntapi: Native API core library                      */
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/*  Copyright (C) 2013--2021  SysDeer Technologies, LLC */
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/*  Released under GPLv2 and GPLv3; see COPYING.NTAPI.  */
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/********************************************************/
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#include <psxtypes/psxtypes.h>
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#include <ntapi/nt_status.h>
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#include <ntapi/nt_object.h>
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#include <ntapi/nt_acl.h>
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#include "ntapi_impl.h"
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#define __SID_SYSTEM			{1,1,{{0,0,0,0,0,5}},{18}}
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#define __SID_OWNER_RIGHTS		{1,1,{{0,0,0,0,0,3}},{4}}
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#define __SID_AUTHENTICATED_USERS	{1,1,{{0,0,0,0,0,5}},{11}}
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#define __SID_ADMINISTRATORS		{1,2,{{0,0,0,0,0,5}},{32,544}}
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static const nt_sid    sid_system       = __SID_SYSTEM;
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static const nt_sid    sid_owner_rights = __SID_OWNER_RIGHTS;
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static const nt_sid    sid_auth_users   = __SID_AUTHENTICATED_USERS;
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static const nt_sid_os sid_admins       = __SID_ADMINISTRATORS;
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static nt_access_allowed_ace * __acl_ace_init(
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	nt_access_allowed_ace * ace,
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	uint32_t		mask,
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	const nt_sid *		sid,
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	uint32_t		flags,
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	uint16_t *		aces)
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{
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	if (mask == 0)
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		return ace;
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	ace->mask             = mask;
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	ace->header.ace_type  = NT_ACE_TYPE_ACCESS_ALLOWED;
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	ace->header.ace_flags = flags;
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	ace->header.ace_size  = sizeof(uint32_t) * sid->sub_authority_count
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	                        + __offsetof(nt_access_allowed_ace,sid_start)
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	                        + __offsetof(nt_sid,sub_authority);
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	__ntapi->tt_sid_copy(
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		(nt_sid *)&ace->sid_start,
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		sid);
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	(*aces)++;
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	return (nt_access_allowed_ace *)((size_t)ace + ace->header.ace_size);
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}
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void __stdcall __ntapi_acl_init_common_descriptor(
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	__out	nt_sd_common_buffer *	sd,
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	__in	const nt_sid *		owner,
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	__in	const nt_sid *		group,
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	__in	const nt_sid *		other,
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	__in	const nt_sid *		admin,
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	__in	uint32_t		owner_access,
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	__in	uint32_t		group_access,
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	__in	uint32_t		other_access,
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	__in	uint32_t		admin_access,
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	__in	uint32_t		system_access,
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	__in	uint32_t		ace_flags)
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{
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	nt_access_allowed_ace * ace;
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	uint16_t                ace_count        = 0;
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	/* sd header */
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	sd->sd.revision         = 1;
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	sd->sd.sbz_1st          = 0;
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	sd->sd.control          = NT_SE_SELF_RELATIVE | NT_SE_DACL_PRESENT | NT_SE_DACL_PROTECTED;
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	sd->sd.offset_owner     = __offsetof(nt_sd_common_buffer,owner);
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	sd->sd.offset_group     = 0;
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	sd->sd.offset_dacl      = __offsetof(nt_sd_common_buffer,dacl);
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	sd->sd.offset_sacl      = 0;
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	/* owner, group, other: default sid's */
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	owner = owner ? owner : __ntapi_internals()->user;
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	group = group ? group : owner;
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	other = other ? other : &sid_auth_users;
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	/* owner sid */
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	__ntapi->tt_sid_copy(
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		(nt_sid *)&sd->owner,
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		owner);
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	/* is the local system account both the owner and the group? */
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	if (!__ntapi->tt_sid_compare(owner,&sid_system))
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		if (!__ntapi->tt_sid_compare(group,&sid_system))
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				if (system_access == owner_access)
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					system_access = 0;
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	/* is the built-in administrators group both the owner and the group? */
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	if (!__ntapi->tt_sid_compare(owner,(nt_sid *)&sid_admins))
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		if (!__ntapi->tt_sid_compare(group,(nt_sid *)&sid_admins))
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				if (admin_access == owner_access)
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					admin_access = 0;
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	/* ace's */
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	ace = (nt_access_allowed_ace *)&sd->buffer;
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	ace = __acl_ace_init(ace,system_access,&sid_system,ace_flags,&ace_count);
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	ace = __acl_ace_init(ace,owner_access,&sid_owner_rights,ace_flags,&ace_count);
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	ace = __acl_ace_init(ace,group_access,group,ace_flags,&ace_count);
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	ace = __acl_ace_init(ace,other_access,other,ace_flags,&ace_count);
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	if (admin_access) {
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		admin = admin ? admin : (nt_sid *)&sid_admins;
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		ace   = __acl_ace_init(ace,admin_access,admin,ace_flags,&ace_count);
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	}
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	/* dacl */
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	sd->dacl.acl_revision   = 0x02;
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	sd->dacl.sbz_1st        = 0;
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	sd->dacl.acl_size       = (uint16_t)((char *)ace - (char *)&sd->dacl);
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	sd->dacl.ace_count      = ace_count;
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	sd->dacl.sbz_2nd        = 0;
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}
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static int32_t __acl_init_common_meta_impl(
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	__out	nt_sd_common_meta *	meta,
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	__in	nt_sd *			sd)
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{
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	int			i;
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	nt_sid *		sid;
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	nt_acl *		acl;
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	nt_access_allowed_ace *	ace;
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	nt_access_allowed_ace *	sysace;
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	nt_sid *		syssid;
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	unsigned char *		value;
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	unsigned char		sacnt;
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	char *			mark = (char *)sd;
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	meta->sd    = sd;
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	meta->owner = sd->offset_owner ? (nt_sid *)(mark + sd->offset_owner) : 0;
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	meta->group = 0;
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	meta->dacl  = sd->offset_dacl  ? (nt_acl *)(mark + sd->offset_dacl) : 0;
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	meta->owner_ace  = 0;
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	meta->owner_sid  = 0;
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	meta->group_ace  = 0;
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	meta->group_sid  = 0;
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	meta->other_ace  = 0;
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	meta->other_sid  = 0;
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	meta->admin_ace  = 0;
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	meta->admin_sid  = 0;
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	meta->system_acc = 0;
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	if (!meta->owner)
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		return NT_STATUS_INVALID_OWNER;
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	if (!(acl = meta->dacl))
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		return NT_STATUS_SUCCESS;
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	if (acl->ace_count == 0)
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		return NT_STATUS_SUCCESS;
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	if (acl->ace_count > 5)
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		return NT_STATUS_NOT_SUPPORTED;
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	ace = (nt_access_allowed_ace *)&acl[1];
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	for (i=0; i<acl->ace_count; i++) {
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		if (ace->header.ace_type != NT_ACE_TYPE_ACCESS_ALLOWED)
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			return NT_STATUS_NOT_SUPPORTED;
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		mark = (char *)ace + ace->header.ace_size;
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		ace  = (nt_access_allowed_ace *)mark;
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	}
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	ace = (nt_access_allowed_ace *)&acl[1];
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	for (i=0; i<acl->ace_count; i++) {
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		sid   = (nt_sid *)&ace->sid_start;
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		value = sid->identifier_authority.value;
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		if (!(__ntapi->tt_sid_compare(sid,&sid_system))) {
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			meta->system_acc = ace->mask;
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			sysace = ace;
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			syssid = sid;
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		} else if (!(__ntapi->tt_sid_compare(sid,&sid_owner_rights))) {
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			if (meta->owner_ace)
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				return NT_STATUS_INVALID_ACL;
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			meta->owner_ace = ace;
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			meta->owner_sid = sid;
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		}
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		else if (!(__ntapi->tt_sid_compare(sid,&sid_auth_users))) {
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			if (meta->other_ace)
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				return NT_STATUS_INVALID_ACL;
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			meta->other_ace = ace;
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			meta->other_sid = sid;
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		}
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		else if (!meta->admin_ace && !(__ntapi->tt_sid_compare(sid,(nt_sid *)&sid_admins))) {
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			meta->admin_ace = ace;
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			meta->admin_sid = sid;
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		}
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		else if (!(__ntapi->tt_sid_compare(sid,meta->owner))) {
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			if (meta->group_ace)
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				return NT_STATUS_INVALID_ACL;
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			meta->group_ace = ace;
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			meta->group_sid = sid;
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			meta->group     = sid;
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		}
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		else if ((value[0] == 0) && (value[1] == 0)
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				&& (value[2] == 0) && (value[3] == 0)
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				&& (value[4] == 0) && (value[5] == 5)
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				&& (sid->sub_authority[0] == 21)
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				&& ((sacnt = sid->sub_authority_count))
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				&& (sid->sub_authority[sacnt - 1] == 500)) {
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			if (meta->admin_ace)
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				return NT_STATUS_INVALID_ACL;
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			meta->admin_ace = ace;
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			meta->admin_sid = sid;
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		}
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		else {
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			if (meta->group_ace)
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				return NT_STATUS_INVALID_ACL;
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			meta->group_ace = ace;
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			meta->group_sid = sid;
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			meta->group     = sid;
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		}
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		mark = (char *)ace + ace->header.ace_size;
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		ace  = (nt_access_allowed_ace *)mark;
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	}
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	if (!meta->group_ace && meta->owner_ace) {
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		if (meta->owner_ace->mask != meta->system_acc) {
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			if (!__ntapi->tt_sid_compare(meta->owner,&sid_system)) {
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				meta->group_ace  = sysace;
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				meta->group_sid  = syssid;
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				meta->group      = syssid;
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				meta->system_acc = meta->owner_ace->mask;
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			}
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		}
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	}
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	return NT_STATUS_SUCCESS;
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}
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static int32_t __acl_init_common_meta_strict(
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	__out	nt_sd_common_meta *	meta,
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	__in	nt_sd *			sd)
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{
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	int32_t			status;
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	nt_sd_common_meta	m;
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	if ((status = __acl_init_common_meta_impl(&m,sd)))
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		return status;
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	meta->sd    = m.sd;
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	meta->owner = m.owner;
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	meta->group = m.group;
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	meta->dacl  = m.dacl;
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	meta->owner_ace  = m.owner_ace;
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	meta->owner_sid  = m.owner_sid;
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	meta->group_ace  = m.group_ace;
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	meta->group_sid  = m.group_sid;
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	meta->other_ace  = m.other_ace;
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	meta->other_sid  = m.other_sid;
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	meta->admin_ace  = m.admin_ace;
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	meta->admin_sid  = m.admin_sid;
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	meta->system_acc = m.system_acc;
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	return NT_STATUS_SUCCESS;
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}
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static int32_t __acl_init_common_meta_query(
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	__out	nt_sd_common_meta *	meta,
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	__in	nt_sd *			sd)
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{
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	__acl_init_common_meta_impl(meta,sd);
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	return NT_STATUS_SUCCESS;
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}
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int32_t __stdcall __ntapi_acl_init_common_descriptor_meta(
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	__out	nt_sd_common_meta *	meta,
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	__in	nt_sd *			sd,
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	__in	uint32_t		options)
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{
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	switch (options) {
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		case NT_ACL_INIT_COMMON_DESCRIPTION_META_QUERY_MODE:
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			return __acl_init_common_meta_query(meta,sd);
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		case NT_ACL_INIT_COMMON_DESCRIPTION_META_STRICT_MODE:
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			return __acl_init_common_meta_strict(meta,sd);
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		default:
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			return NT_STATUS_INVALID_PARAMETER;
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	}
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}