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tdelibs/tdeio/tdeio/kacl.cpp

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/* This file is part of the KDE project
Copyright (C) 2005 Till Adam <adam@kde.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
// $Id: kacl.cpp 424977 2005-06-13 15:13:22Z tilladam $
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
#include <sys/stat.h>
#ifdef USE_POSIX_ACL
#ifdef HAVE_NON_POSIX_ACL_EXTENSIONS
#include <acl/libacl.h>
#else
#include <posixacladdons.h>
#endif
#endif
#include <tqintdict.h>
#include <kdebug.h>
#include "kacl.h"
#ifdef USE_POSIX_ACL
static void printACL( acl_t acl, const TQString &comment );
static TQString aclAsString(const acl_t acl);
#endif
class KACL::KACLPrivate {
public:
KACLPrivate() : m_acl( 0 ) { init(); }
#ifdef USE_POSIX_ACL
KACLPrivate( acl_t acl )
: m_acl( acl ) { init(); }
~KACLPrivate() { if ( m_acl ) acl_free( m_acl ); }
#endif
void init() {
m_usercache.setAutoDelete( true );
m_groupcache.setAutoDelete( true );
}
// helpers
#ifdef USE_POSIX_ACL
bool setMaskPermissions( unsigned short v );
TQString getUserName( uid_t uid ) const;
TQString getGroupName( gid_t gid ) const;
bool setAllUsersOrGroups( const TQValueList< QPair<TQString, unsigned short> > &list, acl_tag_t type );
bool setNamedUserOrGroupPermissions( const TQString& name, unsigned short permissions, acl_tag_t type );
acl_t m_acl;
#else
int m_acl;
#endif
mutable TQIntDict<TQString> m_usercache;
mutable TQIntDict<TQString> m_groupcache;
};
KACL::KACL( const TQString &aclString )
: d( new KACLPrivate )
{
setACL( aclString );
}
KACL::KACL( mode_t basePermissions )
#ifdef USE_POSIX_ACL
: d( new KACLPrivate( acl_from_mode( basePermissions ) ) )
#else
: d( new KACLPrivate )
#endif
{
#ifndef USE_POSIX_ACL
Q_UNUSED( basePermissions );
#endif
}
KACL::KACL()
: d( new KACLPrivate )
{
}
KACL::KACL( const KACL& rhs )
: d( new KACLPrivate )
{
setACL( rhs.asString() );
}
KACL::~KACL()
{
delete d;
}
bool KACL::operator==( const KACL& rhs ) const {
#ifdef USE_POSIX_ACL
return ( acl_cmp( d->m_acl, rhs.d->m_acl ) == 0 );
#else
Q_UNUSED( rhs );
return true;
#endif
}
bool KACL::isValid() const
{
bool valid = false;
#ifdef USE_POSIX_ACL
if ( d->m_acl ) {
valid = ( acl_valid( d->m_acl ) == 0 );
}
#endif
return valid;
}
bool KACL::isExtended() const
{
#ifdef USE_POSIX_ACL
return ( acl_equiv_mode( d->m_acl, NULL ) != 0 );
#else
return false;
#endif
}
#ifdef USE_POSIX_ACL
static acl_entry_t entryForTag( acl_t acl, acl_tag_t tag )
{
acl_entry_t entry;
int ret = acl_get_entry( acl, ACL_FIRST_ENTRY, &entry );
while ( ret == 1 ) {
acl_tag_t currentTag;
acl_get_tag_type( entry, &currentTag );
if ( currentTag == tag )
return entry;
ret = acl_get_entry( acl, ACL_NEXT_ENTRY, &entry );
}
return 0;
}
static unsigned short entryToPermissions( acl_entry_t entry )
{
if ( entry == 0 ) return 0;
acl_permset_t permset;
if ( acl_get_permset( entry, &permset ) != 0 ) return 0;
return( acl_get_perm( permset, ACL_READ ) << 2 |
acl_get_perm( permset, ACL_WRITE ) << 1 |
acl_get_perm( permset, ACL_EXECUTE ) );
}
static void permissionsToEntry( acl_entry_t entry, unsigned short v )
{
if ( entry == 0 ) return;
acl_permset_t permset;
if ( acl_get_permset( entry, &permset ) != 0 ) return;
acl_clear_perms( permset );
if ( v & 4 ) acl_add_perm( permset, ACL_READ );
if ( v & 2 ) acl_add_perm( permset, ACL_WRITE );
if ( v & 1 ) acl_add_perm( permset, ACL_EXECUTE );
}
static void printACL( acl_t acl, const TQString &comment )
{
kdDebug() << comment << aclAsString( acl ) << endl;
}
static int getUidForName( const TQString& name )
{
struct passwd *user = getpwnam( name.latin1() );
if ( user )
return user->pw_uid;
else
return -1;
}
static int getGidForName( const TQString& name )
{
struct group *group = getgrnam( name.latin1() );
if ( group )
return group->gr_gid;
else
return -1;
}
#endif
// ------------------ begin API implementation ------------
unsigned short KACL::ownerPermissions() const
{
#ifdef USE_POSIX_ACL
return entryToPermissions( entryForTag( d->m_acl, ACL_USER_OBJ ) );
#else
return 0;
#endif
}
bool KACL::setOwnerPermissions( unsigned short v )
{
#ifdef USE_POSIX_ACL
permissionsToEntry( entryForTag( d->m_acl, ACL_USER_OBJ ), v );
#else
Q_UNUSED( v );
#endif
return true;
}
unsigned short KACL::owningGroupPermissions() const
{
#ifdef USE_POSIX_ACL
return entryToPermissions( entryForTag( d->m_acl, ACL_GROUP_OBJ ) );
#else
return 0;
#endif
}
bool KACL::setOwningGroupPermissions( unsigned short v )
{
#ifdef USE_POSIX_ACL
permissionsToEntry( entryForTag( d->m_acl, ACL_GROUP_OBJ ), v );
#else
Q_UNUSED( v );
#endif
return true;
}
unsigned short KACL::othersPermissions() const
{
#ifdef USE_POSIX_ACL
return entryToPermissions( entryForTag( d->m_acl, ACL_OTHER ) );
#else
return 0;
#endif
}
bool KACL::setOthersPermissions( unsigned short v )
{
#ifdef USE_POSIX_ACL
permissionsToEntry( entryForTag( d->m_acl, ACL_OTHER ), v );
#else
Q_UNUSED( v );
#endif
return true;
}
mode_t KACL::basePermissions() const
{
mode_t perms( 0 );
#ifdef USE_POSIX_ACL
if ( ownerPermissions() & ACL_READ ) perms |= S_IRUSR;
if ( ownerPermissions() & ACL_WRITE ) perms |= S_IWUSR;
if ( ownerPermissions() & ACL_EXECUTE ) perms |= S_IXUSR;
if ( owningGroupPermissions() & ACL_READ ) perms |= S_IRGRP;
if ( owningGroupPermissions() & ACL_WRITE ) perms |= S_IWGRP;
if ( owningGroupPermissions() & ACL_EXECUTE ) perms |= S_IXGRP;
if ( othersPermissions() & ACL_READ ) perms |= S_IROTH;
if ( othersPermissions() & ACL_WRITE ) perms |= S_IWOTH;
if ( othersPermissions() & ACL_EXECUTE ) perms |= S_IXOTH;
#endif
return perms;
}
unsigned short KACL::maskPermissions( bool &exists ) const
{
exists = true;
#ifdef USE_POSIX_ACL
acl_entry_t entry = entryForTag( d->m_acl, ACL_MASK );
if ( entry == 0 ) {
exists = false;
return 0;
}
return entryToPermissions( entry );
#else
return 0;
#endif
}
#ifdef USE_POSIX_ACL
bool KACL::KACLPrivate::setMaskPermissions( unsigned short v )
{
acl_entry_t entry = entryForTag( m_acl, ACL_MASK );
if ( entry == 0 ) {
acl_create_entry( &m_acl, &entry );
acl_set_tag_type( entry, ACL_MASK );
}
permissionsToEntry( entry, v );
return true;
}
#endif
bool KACL::setMaskPermissions( unsigned short v )
{
#ifdef USE_POSIX_ACL
return d->setMaskPermissions( v );
#else
Q_UNUSED( v );
return true;
#endif
}
/**************************
* Deal with named users *
**************************/
unsigned short KACL::namedUserPermissions( const TQString& name, bool *exists ) const
{
#ifdef USE_POSIX_ACL
acl_entry_t entry;
uid_t id;
*exists = false;
int ret = acl_get_entry( d->m_acl, ACL_FIRST_ENTRY, &entry );
while ( ret == 1 ) {
acl_tag_t currentTag;
acl_get_tag_type( entry, &currentTag );
if ( currentTag == ACL_USER ) {
id = *( (uid_t*) acl_get_qualifier( entry ) );
if ( d->getUserName( id ) == name ) {
*exists = true;
return entryToPermissions( entry );
}
}
ret = acl_get_entry( d->m_acl, ACL_NEXT_ENTRY, &entry );
}
#else
Q_UNUSED( name );
Q_UNUSED( exists );
#endif
return 0;
}
#ifdef USE_POSIX_ACL
bool KACL::KACLPrivate::setNamedUserOrGroupPermissions( const TQString& name, unsigned short permissions, acl_tag_t type )
{
bool allIsWell = true;
acl_t newACL = acl_dup( m_acl );
acl_entry_t entry;
bool createdNewEntry = false;
bool found = false;
int ret = acl_get_entry( newACL, ACL_FIRST_ENTRY, &entry );
while ( ret == 1 ) {
acl_tag_t currentTag;
acl_get_tag_type( entry, &currentTag );
if ( currentTag == type ) {
int id = * (int*)acl_get_qualifier( entry );
const TQString entryName = type == ACL_USER? getUserName( id ): getGroupName( id );
if ( entryName == name ) {
// found him, update
permissionsToEntry( entry, permissions );
found = true;
break;
}
}
ret = acl_get_entry( newACL, ACL_NEXT_ENTRY, &entry );
}
if ( !found ) {
acl_create_entry( &newACL, &entry );
acl_set_tag_type( entry, type );
int id = type == ACL_USER? getUidForName( name ): getGidForName( name );
if ( id == -1 || acl_set_qualifier( entry, &id ) != 0 ) {
acl_delete_entry( newACL, entry );
allIsWell = false;
} else {
permissionsToEntry( entry, permissions );
createdNewEntry = true;
}
}
if ( allIsWell && createdNewEntry ) {
// 23.1.1 of 1003.1e states that as soon as there is a named user or
// named group entry, there needs to be a mask entry as well, so add
// one, if the user hasn't explicitely set one.
if ( entryForTag( newACL, ACL_MASK ) == 0 ) {
acl_calc_mask( &newACL );
}
}
if ( !allIsWell || acl_valid( newACL ) != 0 ) {
acl_free( newACL );
allIsWell = false;
} else {
acl_free( m_acl );
m_acl = newACL;
}
return allIsWell;
}
#endif
bool KACL::setNamedUserPermissions( const TQString& name, unsigned short permissions )
{
#ifdef USE_POSIX_ACL
return d->setNamedUserOrGroupPermissions( name, permissions, ACL_USER );
#else
Q_UNUSED( name );
Q_UNUSED( permissions );
return true;
#endif
}
ACLUserPermissionsList KACL::allUserPermissions() const
{
ACLUserPermissionsList list;
#ifdef USE_POSIX_ACL
acl_entry_t entry;
uid_t id;
int ret = acl_get_entry( d->m_acl, ACL_FIRST_ENTRY, &entry );
while ( ret == 1 ) {
acl_tag_t currentTag;
acl_get_tag_type( entry, &currentTag );
if ( currentTag == ACL_USER ) {
id = *( (uid_t*) acl_get_qualifier( entry ) );
TQString name = d->getUserName( id );
unsigned short permissions = entryToPermissions( entry );
ACLUserPermissions pair = qMakePair( name, permissions );
list.append( pair );
}
ret = acl_get_entry( d->m_acl, ACL_NEXT_ENTRY, &entry );
}
#endif
return list;
}
#ifdef USE_POSIX_ACL
bool KACL::KACLPrivate::setAllUsersOrGroups( const TQValueList< QPair<TQString, unsigned short> > &list, acl_tag_t type )
{
bool allIsWell = true;
bool atLeastOneUserOrGroup = false;
// make working copy, in case something goes wrong
acl_t newACL = acl_dup( m_acl );
acl_entry_t entry;
//printACL( newACL, "Before cleaning: " );
// clear user entries
int ret = acl_get_entry( newACL, ACL_FIRST_ENTRY, &entry );
while ( ret == 1 ) {
acl_tag_t currentTag;
acl_get_tag_type( entry, &currentTag );
if ( currentTag == type ) {
acl_delete_entry( newACL, entry );
// we have to start from the beginning, the iterator is
// invalidated, on deletion
ret = acl_get_entry( newACL, ACL_FIRST_ENTRY, &entry );
} else {
ret = acl_get_entry( newACL, ACL_NEXT_ENTRY, &entry );
}
}
//printACL( newACL, "After cleaning out entries: " );
// now add the entries from the list
TQValueList< QPair<TQString, unsigned short> >::const_iterator it = list.constBegin();
while ( it != list.constEnd() ) {
acl_create_entry( &newACL, &entry );
acl_set_tag_type( entry, type );
int id = type == ACL_USER? getUidForName( (*it).first):getGidForName( (*it).first );
if ( id == -1 || acl_set_qualifier( entry, &id ) != 0 ) {
// user or group doesn't exist => error
acl_delete_entry( newACL, entry );
allIsWell = false;
break;
} else {
permissionsToEntry( entry, (*it).second );
atLeastOneUserOrGroup = true;
}
++it;
}
//printACL( newACL, "After adding entries: " );
if ( allIsWell && atLeastOneUserOrGroup ) {
// 23.1.1 of 1003.1e states that as soon as there is a named user or
// named group entry, there needs to be a mask entry as well, so add
// one, if the user hasn't explicitely set one.
if ( entryForTag( newACL, ACL_MASK ) == 0 ) {
acl_calc_mask( &newACL );
}
}
if ( allIsWell && ( acl_valid( newACL ) == 0 ) ) {
acl_free( m_acl );
m_acl = newACL;
} else {
acl_free( newACL );
}
return allIsWell;
}
#endif
bool KACL::setAllUserPermissions( const ACLUserPermissionsList &users )
{
#ifdef USE_POSIX_ACL
return d->setAllUsersOrGroups( users, ACL_USER );
#else
Q_UNUSED( users );
return true;
#endif
}
/**************************
* Deal with named groups *
**************************/
unsigned short KACL::namedGroupPermissions( const TQString& name, bool *exists ) const
{
*exists = false;
#ifdef USE_POSIX_ACL
acl_entry_t entry;
gid_t id;
int ret = acl_get_entry( d->m_acl, ACL_FIRST_ENTRY, &entry );
while ( ret == 1 ) {
acl_tag_t currentTag;
acl_get_tag_type( entry, &currentTag );
if ( currentTag == ACL_GROUP ) {
id = *( (gid_t*) acl_get_qualifier( entry ) );
if ( d->getGroupName( id ) == name ) {
*exists = true;
return entryToPermissions( entry );
}
}
ret = acl_get_entry( d->m_acl, ACL_NEXT_ENTRY, &entry );
}
#else
Q_UNUSED( name );
#endif
return 0;
}
bool KACL::setNamedGroupPermissions( const TQString& name, unsigned short permissions )
{
#ifdef USE_POSIX_ACL
return d->setNamedUserOrGroupPermissions( name, permissions, ACL_GROUP );
#else
Q_UNUSED( name );
Q_UNUSED( permissions );
return true;
#endif
}
ACLGroupPermissionsList KACL::allGroupPermissions() const
{
ACLGroupPermissionsList list;
#ifdef USE_POSIX_ACL
acl_entry_t entry;
gid_t id;
int ret = acl_get_entry( d->m_acl, ACL_FIRST_ENTRY, &entry );
while ( ret == 1 ) {
acl_tag_t currentTag;
acl_get_tag_type( entry, &currentTag );
if ( currentTag == ACL_GROUP ) {
id = *( (gid_t*) acl_get_qualifier( entry ) );
TQString name = d->getGroupName( id );
unsigned short permissions = entryToPermissions( entry );
ACLGroupPermissions pair = qMakePair( name, permissions );
list.append( pair );
}
ret = acl_get_entry( d->m_acl, ACL_NEXT_ENTRY, &entry );
}
#endif
return list;
}
bool KACL::setAllGroupPermissions( const ACLGroupPermissionsList &groups )
{
#ifdef USE_POSIX_ACL
return d->setAllUsersOrGroups( groups, ACL_GROUP );
#else
Q_UNUSED( groups );
return true;
#endif
}
/**************************
* from and to string *
**************************/
bool KACL::setACL( const TQString &aclStr )
{
bool ret = false;
#ifdef USE_POSIX_ACL
if ( aclStr.isEmpty() )
return false;
acl_t temp = acl_from_text( aclStr.latin1() );
if ( acl_valid( temp ) != 0 ) {
// TODO errno is set, what to do with it here?
acl_free( temp );
} else {
if ( d->m_acl )
acl_free( d->m_acl );
d->m_acl = temp;
ret = true;
}
#else
Q_UNUSED( aclStr );
#endif
return ret;
}
TQString KACL::asString() const
{
#ifdef USE_POSIX_ACL
return aclAsString( d->m_acl );
#else
return TQString::null;
#endif
}
// helpers
#ifdef USE_POSIX_ACL
TQString KACL::KACLPrivate::getUserName( uid_t uid ) const
{
TQString *temp;
temp = m_usercache.find( uid );
if ( !temp ) {
struct passwd *user = getpwuid( uid );
if ( user ) {
m_usercache.insert( uid, new TQString(TQString::fromLatin1(user->pw_name)) );
return TQString::fromLatin1( user->pw_name );
}
else
return TQString::number( uid );
}
else
return *temp;
}
TQString KACL::KACLPrivate::getGroupName( gid_t gid ) const
{
TQString *temp;
temp = m_groupcache.find( gid );
if ( !temp ) {
struct group *grp = getgrgid( gid );
if ( grp ) {
m_groupcache.insert( gid, new TQString(TQString::fromLatin1(grp->gr_name)) );
return TQString::fromLatin1( grp->gr_name );
}
else
return TQString::number( gid );
}
else
return *temp;
}
static TQString aclAsString(const acl_t acl)
{
char *aclString = acl_to_text( acl, 0 );
TQString ret = TQString::fromLatin1( aclString );
acl_free( (void*)aclString );
return ret;
}
#endif
void KACL::virtual_hook( int, void* )
{ /*BASE::virtual_hook( id, data );*/ }
TQDataStream & operator<< ( TQDataStream & s, const KACL & a )
{
s << a.asString();
return s;
}
TQDataStream & operator>> ( TQDataStream & s, KACL & a )
{
TQString str;
s >> str;
a.setACL( str );
return s;
}
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