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/*
Unix SMB/CIFS implementation.
Privileges handling functions
Copyright (C) Jean François Micouleau 1998-2001
Copyright (C) Simo Sorce 2002-2003
Copyright (C) Gerald (Jerry) Carter 2005
Copyright (C) Michael Adam 2007
Copyright (C) Andrew Bartlett 2010
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Basic privileges functions (mask-operations and conversion
* functions between the different formats (se_priv, privset, luid)
* moved here * from lib/privileges.c to minimize linker deps.
*
* generally SID- and LUID-related code is left in lib/privileges.c
*
* some extra functions to hide privs array from lib/privileges.c
*/
#include "includes.h"
const uint64_t se_priv_all = SE_ALL_PRIVS;
static const uint64_t se_priv_end = SE_END;
/* Define variables for all privileges so we can use the
uint64_t* in the various se_priv_XXX() functions */
const uint64_t se_priv_none = SE_NONE;
const uint64_t se_machine_account = SE_MACHINE_ACCOUNT;
const uint64_t se_print_operator = SE_PRINT_OPERATOR;
const uint64_t se_add_users = SE_ADD_USERS;
const uint64_t se_disk_operators = SE_DISK_OPERATOR;
const uint64_t se_remote_shutdown = SE_REMOTE_SHUTDOWN;
const uint64_t se_restore = SE_RESTORE;
const uint64_t se_take_ownership = SE_TAKE_OWNERSHIP;
PRIVS privs[] = {
#if 0 /* usrmgr will display these twice if you include them. We don't
use them but we'll keep the bitmasks reserved in privileges.h anyways */
{SE_NETWORK_LOGON, "SeNetworkLogonRight", "Access this computer from network", 0x0},
{SE_INTERACTIVE_LOGON, "SeInteractiveLogonRight", "Log on locally", 0x0},
{SE_BATCH_LOGON, "SeBatchLogonRight", "Log on as a batch job", 0x0},
{SE_SERVICE_LOGON, "SeServiceLogonRight", "Log on as a service", 0x0},
#endif
{SE_MACHINE_ACCOUNT, "SeMachineAccountPrivilege", "Add machines to domain", SEC_PRIV_MACHINE_ACCOUNT},
{SE_TAKE_OWNERSHIP, "SeTakeOwnershipPrivilege", "Take ownership of files or other objects",SEC_PRIV_TAKE_OWNERSHIP},
{SE_BACKUP, "SeBackupPrivilege", "Back up files and directories", SEC_PRIV_BACKUP},
{SE_RESTORE, "SeRestorePrivilege", "Restore files and directories", SEC_PRIV_RESTORE},
{SE_REMOTE_SHUTDOWN, "SeRemoteShutdownPrivilege", "Force shutdown from a remote system", SEC_PRIV_REMOTE_SHUTDOWN},
{SE_PRINT_OPERATOR, "SePrintOperatorPrivilege", "Manage printers", SEC_PRIV_PRINT_OPERATOR},
{SE_ADD_USERS, "SeAddUsersPrivilege", "Add users and groups to the domain", SEC_PRIV_ADD_USERS},
{SE_DISK_OPERATOR, "SeDiskOperatorPrivilege", "Manage disk shares", SEC_PRIV_DISK_OPERATOR},
{SE_END, "", "", 0x0}
};
/***************************************************************************
copy an uint64_t structure
****************************************************************************/
bool se_priv_copy( uint64_t *dst, const uint64_t *src )
{
if ( !dst || !src )
return False;
memcpy( dst, src, sizeof(uint64_t) );
return True;
}
/***************************************************************************
put all privileges into a mask
****************************************************************************/
bool se_priv_put_all_privileges(uint64_t *mask)
{
int i;
uint32 num_privs = count_all_privileges();
if (!se_priv_copy(mask, &se_priv_none)) {
return False;
}
for ( i=0; i<num_privs; i++ ) {
se_priv_add(mask, &privs[i].se_priv);
}
return True;
}
/***************************************************************************
combine 2 uint64_t structures and store the resulting set in mew_mask
****************************************************************************/
void se_priv_add( uint64_t *mask, const uint64_t *addpriv )
{
*mask |= *addpriv;
}
/***************************************************************************
remove one uint64_t sytucture from another and store the resulting set
in mew_mask
****************************************************************************/
void se_priv_remove( uint64_t *mask, const uint64_t *removepriv )
{
*mask &= ~*removepriv;
}
/***************************************************************************
invert a given uint64_t and store the set in new_mask
****************************************************************************/
static void se_priv_invert( uint64_t *new_mask, const uint64_t *mask )
{
uint64_t allprivs;
se_priv_copy( &allprivs, &se_priv_all );
se_priv_remove( &allprivs, mask );
se_priv_copy( new_mask, &allprivs );
}
/***************************************************************************
check if 2 uint64_t structure are equal
****************************************************************************/
bool se_priv_equal( const uint64_t *mask1, const uint64_t *mask2 )
{
return *mask1 == *mask2;
}
/***************************************************************************
check if a uint64_t has any assigned privileges
****************************************************************************/
static bool se_priv_empty( const uint64_t *mask )
{
uint64_t p1;
se_priv_copy( &p1, mask );
p1 &= se_priv_all;
return se_priv_equal( &p1, &se_priv_none );
}
/*********************************************************************
Lookup the uint64_t value for a privilege name
*********************************************************************/
bool se_priv_from_name( const char *name, uint64_t *mask )
{
int i;
for ( i=0; !se_priv_equal(&privs[i].se_priv, &se_priv_end); i++ ) {
if ( strequal( privs[i].name, name ) ) {
se_priv_copy( mask, &privs[i].se_priv );
return True;
}
}
return False;
}
/***************************************************************************
dump an uint64_t structure to the log files
****************************************************************************/
void dump_se_priv( int dbg_cl, int dbg_lvl, const uint64_t *mask )
{
DEBUGADDC( dbg_cl, dbg_lvl,("uint64_t 0x%llx\n", (unsigned long long)*mask));
}
/****************************************************************************
check if the privilege is in the privilege list
****************************************************************************/
bool is_privilege_assigned(const uint64_t *privileges,
const uint64_t *check)
{
uint64_t p1, p2;
if ( !privileges || !check )
return False;
/* everyone has privileges if you aren't checking for any */
if ( se_priv_empty( check ) ) {
DEBUG(1,("is_privilege_assigned: no privileges in check_mask!\n"));
return True;
}
se_priv_copy( &p1, check );
/* invert the uint64_t we want to check for and remove that from the
original set. If we are left with the uint64_t we are checking
for then return True */
se_priv_invert( &p1, check );
se_priv_copy( &p2, privileges );
se_priv_remove( &p2, &p1 );
return se_priv_equal( &p2, check );
}
/****************************************************************************
check if the privilege is in the privilege list
****************************************************************************/
static bool is_any_privilege_assigned( uint64_t *privileges, const uint64_t *check )
{
uint64_t p1, p2;
if ( !privileges || !check )
return False;
/* everyone has privileges if you aren't checking for any */
if ( se_priv_empty( check ) ) {
DEBUG(1,("is_any_privilege_assigned: no privileges in check_mask!\n"));
return True;
}
se_priv_copy( &p1, check );
/* invert the uint64_t we want to check for and remove that from the
original set. If we are left with the uint64_t we are checking
for then return True */
se_priv_invert( &p1, check );
se_priv_copy( &p2, privileges );
se_priv_remove( &p2, &p1 );
/* see if we have any bits left */
return !se_priv_empty( &p2 );
}
/*********************************************************************
Generate the struct lsa_LUIDAttribute structure based on a bitmask
*********************************************************************/
const char* get_privilege_dispname( const char *name )
{
int i;
if (!name) {
return NULL;
}
for ( i=0; !se_priv_equal(&privs[i].se_priv, &se_priv_end); i++ ) {
if ( strequal( privs[i].name, name ) ) {
return privs[i].description;
}
}
return NULL;
}
/****************************************************************************
initialise a privilege list and set the talloc context
****************************************************************************/
/****************************************************************************
Does the user have the specified privilege ? We only deal with one privilege
at a time here.
*****************************************************************************/
bool user_has_privileges(const struct security_token *token, const uint64_t *privilege)
{
if ( !token )
return False;
return is_privilege_assigned( &token->privilege_mask, privilege );
}
/****************************************************************************
Does the user have any of the specified privileges ? We only deal with one privilege
at a time here.
*****************************************************************************/
bool user_has_any_privilege(struct security_token *token, const uint64_t *privilege)
{
if ( !token )
return False;
return is_any_privilege_assigned( &token->privilege_mask, privilege );
}
/*******************************************************************
return the number of elements in the privlege array
*******************************************************************/
int count_all_privileges( void )
{
/*
* The -1 is due to the weird SE_END record...
*/
return (sizeof(privs) / sizeof(privs[0])) - 1;
}
/*********************************************************************
Generate the struct lsa_LUIDAttribute structure based on a bitmask
The assumption here is that the privilege has already been validated
so we are guaranteed to find it in the list.
*********************************************************************/
struct lsa_LUIDAttribute get_privilege_luid( uint64_t *mask )
{
struct lsa_LUIDAttribute priv_luid;
int i;
ZERO_STRUCT( priv_luid );
for ( i=0; !se_priv_equal(&privs[i].se_priv, &se_priv_end); i++ ) {
if ( se_priv_equal( &privs[i].se_priv, mask ) ) {
priv_luid.luid.low = privs[i].luid;
priv_luid.luid.high = 0;
break;
}
}
return priv_luid;
}
/****************************************************************************
Convert a LUID to a named string
****************************************************************************/
const char *luid_to_privilege_name(const struct lsa_LUID *set)
{
int i;
if (set->high != 0)
return NULL;
for ( i=0; !se_priv_equal(&privs[i].se_priv, &se_priv_end); i++ ) {
if ( set->low == privs[i].luid ) {
return privs[i].name;
}
}
return NULL;
}
/****************************************************************************
add a privilege to a privilege array
****************************************************************************/
static bool privilege_set_add(PRIVILEGE_SET *priv_set, struct lsa_LUIDAttribute set)
{
struct lsa_LUIDAttribute *new_set;
/* we can allocate memory to add the new privilege */
new_set = TALLOC_REALLOC_ARRAY(priv_set->mem_ctx, priv_set->set, struct lsa_LUIDAttribute, priv_set->count + 1);
if ( !new_set ) {
DEBUG(0,("privilege_set_add: failed to allocate memory!\n"));
return False;
}
new_set[priv_set->count].luid.high = set.luid.high;
new_set[priv_set->count].luid.low = set.luid.low;
new_set[priv_set->count].attribute = set.attribute;
priv_set->count++;
priv_set->set = new_set;
return True;
}
/*******************************************************************
*******************************************************************/
bool se_priv_to_privilege_set( PRIVILEGE_SET *set, uint64_t *mask )
{
int i;
uint32 num_privs = count_all_privileges();
struct lsa_LUIDAttribute luid;
luid.attribute = 0;
luid.luid.high = 0;
for ( i=0; i<num_privs; i++ ) {
if ( !is_privilege_assigned(mask, &privs[i].se_priv) )
continue;
luid.luid.high = 0;
luid.luid.low = privs[i].luid;
if ( !privilege_set_add( set, luid ) )
return False;
}
return True;
}
/*******************************************************************
*******************************************************************/
static bool luid_to_se_priv( struct lsa_LUID *luid, uint64_t *mask )
{
int i;
uint32 num_privs = count_all_privileges();
for ( i=0; i<num_privs; i++ ) {
if ( luid->low == privs[i].luid ) {
se_priv_copy( mask, &privs[i].se_priv );
return True;
}
}
return False;
}
/*******************************************************************
*******************************************************************/
bool privilege_set_to_se_priv( uint64_t *mask, struct lsa_PrivilegeSet *privset )
{
int i;
ZERO_STRUCTP( mask );
for ( i=0; i<privset->count; i++ ) {
uint64_t r;
/* sanity check for invalid privilege. we really
only care about the low 32 bits */
if ( privset->set[i].luid.high != 0 )
return False;
if ( luid_to_se_priv( &privset->set[i].luid, &r ) )
se_priv_add( mask, &r );
}
return True;
}
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