488 lines
16 KiB
C
488 lines
16 KiB
C
/*
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* Tokens
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*
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* Copyright (C) 1998 Alexandre Julliard
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* Copyright (C) 2003 Mike McCormack
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* Copyright (C) 2005 Robert Shearman
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "config.h"
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "windef.h"
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#include "handle.h"
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#include "thread.h"
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#include "process.h"
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#include "request.h"
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#include "security.h"
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#define MAX_SUBAUTH_COUNT 1
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const LUID SeIncreaseQuotaPrivilege = { 5, 0 };
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const LUID SeSecurityPrivilege = { 8, 0 };
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const LUID SeTakeOwnershipPrivilege = { 9, 0 };
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const LUID SeLoadDriverPrivilege = { 10, 0 };
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const LUID SeSystemProfilePrivilege = { 11, 0 };
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const LUID SeSystemtimePrivilege = { 12, 0 };
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const LUID SeProfileSingleProcessPrivilege = { 13, 0 };
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const LUID SeIncreaseBasePriorityPrivilege = { 14, 0 };
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const LUID SeCreatePagefilePrivilege = { 15, 0 };
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const LUID SeBackupPrivilege = { 17, 0 };
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const LUID SeRestorePrivilege = { 18, 0 };
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const LUID SeShutdownPrivilege = { 19, 0 };
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const LUID SeDebugPrivilege = { 20, 0 };
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const LUID SeSystemEnvironmentPrivilege = { 22, 0 };
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const LUID SeChangeNotifyPrivilege = { 23, 0 };
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const LUID SeRemoteShutdownPrivilege = { 24, 0 };
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const LUID SeUndockPrivilege = { 25, 0 };
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const LUID SeManageVolumePrivilege = { 28, 0 };
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const LUID SeImpersonatePrivilege = { 29, 0 };
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const LUID SeCreateGlobalPrivilege = { 30, 0 };
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struct token
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{
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struct object obj; /* object header */
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struct list privileges; /* privileges available to the token */
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SID *user; /* SID of user this token represents */
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};
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struct privilege
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{
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struct list entry;
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LUID luid;
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unsigned enabled : 1; /* is the privilege currently enabled? */
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unsigned def : 1; /* is the privilege enabled by default? */
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};
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static void token_dump( struct object *obj, int verbose );
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static void token_destroy( struct object *obj );
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static const struct object_ops token_ops =
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{
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sizeof(struct token), /* size */
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token_dump, /* dump */
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no_add_queue, /* add_queue */
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NULL, /* remove_queue */
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NULL, /* signaled */
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NULL, /* satisfied */
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no_signal, /* signal */
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no_get_fd, /* get_fd */
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token_destroy /* destroy */
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};
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static void token_dump( struct object *obj, int verbose )
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{
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fprintf( stderr, "Security token\n" );
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}
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static SID *security_sid_alloc( const SID_IDENTIFIER_AUTHORITY *idauthority, int subauthcount, const unsigned int subauth[] )
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{
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int i;
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SID *sid = mem_alloc( FIELD_OFFSET(SID, SubAuthority[subauthcount]) );
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if (!sid) return NULL;
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sid->Revision = MAX_ACL_REVISION;
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sid->SubAuthorityCount = subauthcount;
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sid->IdentifierAuthority = *idauthority;
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for (i = 0; i < subauthcount; i++)
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sid->SubAuthority[i] = subauth[i];
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return sid;
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}
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static inline int security_equal_sid( const SID *sid1, const SID *sid2 )
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{
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return ((sid1->SubAuthorityCount == sid2->SubAuthorityCount) &&
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!memcmp( sid1, sid2, FIELD_OFFSET(SID, SubAuthority[sid1->SubAuthorityCount]) ));
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}
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static inline int is_equal_luid( const LUID *luid1, const LUID *luid2 )
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{
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return (luid1->LowPart == luid2->LowPart && luid1->HighPart == luid2->HighPart);
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}
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static inline void luid_and_attr_from_privilege( LUID_AND_ATTRIBUTES *out, const struct privilege *in)
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{
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out->Luid = in->luid;
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out->Attributes =
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(in->enabled ? SE_PRIVILEGE_ENABLED : 0) |
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(in->def ? SE_PRIVILEGE_ENABLED_BY_DEFAULT : 0);
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}
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static struct privilege *privilege_add( struct token *token, const LUID *luid, int enabled )
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{
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struct privilege *privilege = mem_alloc( sizeof(*privilege) );
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if (privilege)
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{
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privilege->luid = *luid;
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privilege->def = privilege->enabled = (enabled != 0);
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list_add_tail( &token->privileges, &privilege->entry );
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}
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return privilege;
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}
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static inline void privilege_remove( struct privilege *privilege )
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{
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list_remove( &privilege->entry );
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free( privilege );
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}
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static void token_destroy( struct object *obj )
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{
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struct token* token;
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struct list *cursor, *cursor_next;
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assert( obj->ops == &token_ops );
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token = (struct token *)obj;
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free( token->user );
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LIST_FOR_EACH_SAFE( cursor, cursor_next, &token->privileges )
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{
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struct privilege *privilege = LIST_ENTRY( cursor, struct privilege, entry );
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privilege_remove( privilege );
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}
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}
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static struct token *create_token( const SID *user, const LUID_AND_ATTRIBUTES *privs, unsigned int priv_count )
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{
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struct token *token = alloc_object( &token_ops );
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if (token)
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{
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int i;
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list_init( &token->privileges );
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/* copy user */
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token->user = memdup( user, FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) );
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if (!token->user)
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{
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release_object( token );
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return NULL;
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}
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/* copy privileges */
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for (i = 0; i < priv_count; i++)
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{
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/* note: we don't check uniqueness: the caller must make sure
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* privs doesn't contain any duplicate luids */
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if (!privilege_add( token, &privs[i].Luid,
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privs[i].Attributes & SE_PRIVILEGE_ENABLED ))
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{
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release_object( token );
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return NULL;
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}
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}
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}
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return token;
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}
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struct sid_data
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{
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SID_IDENTIFIER_AUTHORITY idauth;
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int count;
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unsigned int subauth[MAX_SUBAUTH_COUNT];
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};
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struct token *token_create_admin( void )
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{
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struct token *token;
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const LUID_AND_ATTRIBUTES admin_privs[] =
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{
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{ SeChangeNotifyPrivilege , SE_PRIVILEGE_ENABLED },
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{ SeSecurityPrivilege , 0 },
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{ SeBackupPrivilege , 0 },
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{ SeRestorePrivilege , 0 },
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{ SeSystemtimePrivilege , 0 },
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{ SeShutdownPrivilege , 0 },
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{ SeRemoteShutdownPrivilege , 0 },
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{ SeTakeOwnershipPrivilege , 0 },
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{ SeDebugPrivilege , 0 },
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{ SeSystemEnvironmentPrivilege , 0 },
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{ SeSystemProfilePrivilege , 0 },
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{ SeProfileSingleProcessPrivilege, 0 },
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{ SeIncreaseBasePriorityPrivilege, 0 },
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{ SeLoadDriverPrivilege , 0 },
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{ SeCreatePagefilePrivilege , 0 },
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{ SeIncreaseQuotaPrivilege , 0 },
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{ SeUndockPrivilege , 0 },
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{ SeManageVolumePrivilege , 0 },
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{ SeImpersonatePrivilege , SE_PRIVILEGE_ENABLED },
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{ SeCreateGlobalPrivilege , SE_PRIVILEGE_ENABLED },
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};
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static const struct sid_data well_known_sid_data[] =
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{
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{ { SECURITY_NT_AUTHORITY }, 1, { SECURITY_LOCAL_SYSTEM_RID } }, /* LOCAL_SYSTEM */
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};
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SID *local_system_sid = security_sid_alloc(
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&well_known_sid_data[0].idauth,
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well_known_sid_data[0].count,
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well_known_sid_data[0].subauth );
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if (!local_system_sid) return NULL;
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token = create_token( local_system_sid, admin_privs, sizeof(admin_privs)/sizeof(admin_privs[0]) );
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free( local_system_sid );
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return token;
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}
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static struct privilege *token_find_privilege( struct token *token, const LUID *luid, int enabled_only)
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{
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struct privilege *privilege;
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LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
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{
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if (is_equal_luid( luid, &privilege->luid ))
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{
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if (enabled_only && !privilege->enabled)
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return NULL;
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return privilege;
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}
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}
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return NULL;
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}
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static unsigned int token_adjust_privileges( struct token *token, const LUID_AND_ATTRIBUTES *privs,
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unsigned int count, LUID_AND_ATTRIBUTES *mod_privs,
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unsigned int mod_privs_count)
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{
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int i;
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unsigned int modified_count = 0;
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for (i = 0; i < count; i++)
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{
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struct privilege *privilege =
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token_find_privilege( token, &privs[i].Luid, FALSE );
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if (!privilege)
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{
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set_error( STATUS_NOT_ALL_ASSIGNED );
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continue;
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}
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if (privs[i].Attributes & SE_PRIVILEGE_REMOVE)
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privilege_remove( privilege );
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else
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{
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/* save previous state for caller */
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if (mod_privs_count)
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{
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luid_and_attr_from_privilege(mod_privs, privilege);
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mod_privs++;
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mod_privs_count--;
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modified_count++;
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}
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if (privs[i].Attributes & SE_PRIVILEGE_ENABLED)
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privilege->enabled = TRUE;
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else
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privilege->enabled = FALSE;
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}
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}
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return modified_count;
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}
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static void token_disable_privileges( struct token *token )
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{
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struct privilege *privilege;
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LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
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privilege->enabled = FALSE;
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}
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int token_check_privileges( struct token *token, int all_required,
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const LUID_AND_ATTRIBUTES *reqprivs,
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unsigned int count, LUID_AND_ATTRIBUTES *usedprivs)
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{
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int i;
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unsigned int enabled_count = 0;
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for (i = 0; i < count; i++)
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{
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struct privilege *privilege =
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token_find_privilege( token, &reqprivs[i].Luid, TRUE );
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if (usedprivs)
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usedprivs[i] = reqprivs[i];
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if (privilege && privilege->enabled)
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{
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enabled_count++;
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if (usedprivs)
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usedprivs[i].Attributes |= SE_PRIVILEGE_USED_FOR_ACCESS;
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}
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}
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if (all_required)
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return (enabled_count == count);
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else
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return (enabled_count > 0);
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}
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/* open a security token */
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DECL_HANDLER(open_token)
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{
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if( req->flags & OPEN_TOKEN_THREAD )
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{
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struct thread *thread = get_thread_from_handle( req->handle, 0 );
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if (thread)
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{
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if (thread->token)
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reply->token = alloc_handle( current->process, thread->token, TOKEN_ALL_ACCESS, 0);
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else
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set_error(STATUS_NO_TOKEN);
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release_object( thread );
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}
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}
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else
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{
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struct process *process = get_process_from_handle( req->handle, 0 );
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if (process)
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{
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if (process->token)
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reply->token = alloc_handle( current->process, process->token, TOKEN_ALL_ACCESS, 0);
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else
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set_error(STATUS_NO_TOKEN);
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release_object( process );
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}
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}
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}
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/* adjust the privileges held by a token */
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DECL_HANDLER(adjust_token_privileges)
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{
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struct token *token;
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unsigned int access = TOKEN_ADJUST_PRIVILEGES;
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if (req->get_modified_state) access |= TOKEN_QUERY;
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if ((token = (struct token *)get_handle_obj( current->process, req->handle,
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access, &token_ops )))
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{
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const LUID_AND_ATTRIBUTES *privs = get_req_data();
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LUID_AND_ATTRIBUTES *modified_privs = NULL;
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unsigned int priv_count = get_req_data_size() / sizeof(LUID_AND_ATTRIBUTES);
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unsigned int modified_priv_count = 0;
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if (req->get_modified_state && !req->disable_all)
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{
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int i;
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/* count modified privs */
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for (i = 0; i < priv_count; i++)
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{
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struct privilege *privilege =
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token_find_privilege( token, &privs[i].Luid, FALSE );
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if (privilege && req->get_modified_state)
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modified_priv_count++;
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}
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reply->len = modified_priv_count;
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modified_priv_count = min( modified_priv_count, get_reply_max_size() / sizeof(*modified_privs) );
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if (modified_priv_count)
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modified_privs = set_reply_data_size( modified_priv_count * sizeof(*modified_privs) );
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}
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reply->len = modified_priv_count * sizeof(*modified_privs);
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if (req->disable_all)
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token_disable_privileges( token );
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else
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modified_priv_count = token_adjust_privileges( token, privs,
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priv_count, modified_privs, modified_priv_count );
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release_object( token );
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}
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}
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/* retrieves the list of privileges that may be held be the token */
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DECL_HANDLER(get_token_privileges)
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{
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struct token *token;
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if ((token = (struct token *)get_handle_obj( current->process, req->handle,
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TOKEN_QUERY,
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&token_ops )))
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{
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int priv_count = 0;
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LUID_AND_ATTRIBUTES *privs;
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struct privilege *privilege;
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LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
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priv_count++;
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reply->len = priv_count * sizeof(*privs);
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if (reply->len <= get_reply_max_size())
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{
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privs = set_reply_data_size( priv_count * sizeof(*privs) );
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if (privs)
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{
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int i = 0;
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LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
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{
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luid_and_attr_from_privilege( &privs[i], privilege );
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i++;
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}
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}
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}
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else
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set_error(STATUS_BUFFER_TOO_SMALL);
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release_object( token );
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}
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}
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/* creates a duplicate of the token */
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DECL_HANDLER(duplicate_token)
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{
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struct token *src_token;
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if ((src_token = (struct token *)get_handle_obj( current->process, req->handle,
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TOKEN_DUPLICATE,
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&token_ops )))
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{
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/* FIXME: use req->primary and req->impersonation_level */
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struct token *token = create_token( src_token->user, NULL, 0 );
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if (token)
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{
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struct privilege *privilege;
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unsigned int access;
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LIST_FOR_EACH_ENTRY( privilege, &src_token->privileges, struct privilege, entry )
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privilege_add( token, &privilege->luid, privilege->enabled );
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access = req->access;
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if (access & MAXIMUM_ALLOWED) access = TOKEN_ALL_ACCESS; /* FIXME: needs general solution */
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reply->new_handle = alloc_handle( current->process, token, access, req->inherit);
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release_object( token );
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}
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release_object( src_token );
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}
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}
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/* checks the specified privileges are held by the token */
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DECL_HANDLER(check_token_privileges)
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{
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struct token *token;
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if ((token = (struct token *)get_handle_obj( current->process, req->handle,
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TOKEN_QUERY,
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&token_ops )))
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{
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unsigned int count = get_req_data_size() / sizeof(LUID_AND_ATTRIBUTES);
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if (get_reply_max_size() >= count * sizeof(LUID_AND_ATTRIBUTES))
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{
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LUID_AND_ATTRIBUTES *usedprivs = set_reply_data_size( count * sizeof(*usedprivs) );
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reply->has_privileges = token_check_privileges( token, req->all_required, get_req_data(), count, usedprivs );
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}
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else
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set_error( STATUS_BUFFER_OVERFLOW );
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release_object( token );
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}
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}
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