server/security.h

   1 /*
   2  * Security Management
   3  *
   4  * Copyright (C) 2005 Robert Shearman
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #ifndef __WINE_SERVER_SECURITY_H
  22 #define __WINE_SERVER_SECURITY_H
  23
  24 extern const LUID SeIncreaseQuotaPrivilege;
  25 extern const LUID SeSecurityPrivilege;
  26 extern const LUID SeTakeOwnershipPrivilege;
  27 extern const LUID SeLoadDriverPrivilege;
  28 extern const LUID SeSystemProfilePrivilege;
  29 extern const LUID SeSystemtimePrivilege;
  30 extern const LUID SeProfileSingleProcessPrivilege;
  31 extern const LUID SeIncreaseBasePriorityPrivilege;
  32 extern const LUID SeCreatePagefilePrivilege;
  33 extern const LUID SeBackupPrivilege;
  34 extern const LUID SeRestorePrivilege;
  35 extern const LUID SeShutdownPrivilege;
  36 extern const LUID SeDebugPrivilege;
  37 extern const LUID SeSystemEnvironmentPrivilege;
  38 extern const LUID SeChangeNotifyPrivilege;
  39 extern const LUID SeRemoteShutdownPrivilege;
  40 extern const LUID SeUndockPrivilege;
  41 extern const LUID SeManageVolumePrivilege;
  42 extern const LUID SeImpersonatePrivilege;
  43 extern const LUID SeCreateGlobalPrivilege;
  44
  45 extern const PSID security_world_sid;
  46 extern const PSID security_local_user_sid;
  47 extern const PSID security_local_system_sid;
  48 extern const PSID security_builtin_users_sid;
  49 extern const PSID security_builtin_admins_sid;
  50
  51
  52 /* token functions */
  53
  54 extern struct token *token_create_admin(void);
  55 extern struct token *token_duplicate( struct token *src_token, unsigned primary,
  56                                       int impersonation_level );
  57 extern int token_check_privileges( struct token *token, int all_required,
  58                                    const LUID_AND_ATTRIBUTES *reqprivs,
  59                                    unsigned int count, LUID_AND_ATTRIBUTES *usedprivs);
  60 extern const ACL *token_get_default_dacl( struct token *token );
  61 extern const SID *token_get_user( struct token *token );
  62 extern const SID *token_get_primary_group( struct token *token );
  63 extern int token_sid_present( struct token *token, const SID *sid, int deny);
  64
  65 static inline const ACE_HEADER *ace_next( const ACE_HEADER *ace )
  66 {
  67     return (const ACE_HEADER *)((const char *)ace + ace->AceSize);
  68 }
  69
  70 static inline size_t security_sid_len( const SID *sid )
  71 {
  72     return offsetof( SID, SubAuthority[sid->SubAuthorityCount] );
  73 }
  74
  75 static inline int security_equal_sid( const SID *sid1, const SID *sid2 )
  76 {
  77     return ((sid1->SubAuthorityCount == sid2->SubAuthorityCount) &&
  78             !memcmp( sid1, sid2, security_sid_len( sid1 )));
  79 }
  80
  81 extern void security_set_thread_token( struct thread *thread, obj_handle_t handle );
  82 extern const SID *security_unix_uid_to_sid( uid_t uid );
  83 extern int check_object_access( struct object *obj, unsigned int *access );
  84
  85 static inline int thread_single_check_privilege( struct thread *thread, const LUID *priv)
  86 {
  87     struct token *token = thread_get_impersonation_token( thread );
  88     const LUID_AND_ATTRIBUTES privs = { *priv, 0 };
  89
  90     if (!token) return FALSE;
  91
  92     return token_check_privileges( token, TRUE, &privs, 1, NULL );
  93 }
  94
  95
  96 /* security descriptor helper functions */
  97
  98 extern int sd_is_valid( const struct security_descriptor *sd, data_size_t size );
  99
 100 /* gets the discretionary access control list from a security descriptor */
 101 static inline const ACL *sd_get_dacl( const struct security_descriptor *sd, int *present )
 102 {
 103     *present = (sd->control & SE_DACL_PRESENT) != 0;
 104
 105     if (sd->dacl_len)
 106         return (const ACL *)((const char *)(sd + 1) +
 107             sd->owner_len + sd->group_len + sd->sacl_len);
 108     else
 109         return NULL;
 110 }
 111
 112 /* gets the system access control list from a security descriptor */
 113 static inline const ACL *sd_get_sacl( const struct security_descriptor *sd, int *present )
 114 {
 115     *present = (sd->control & SE_SACL_PRESENT) != 0;
 116
 117     if (sd->sacl_len)
 118         return (const ACL *)((const char *)(sd + 1) +
 119             sd->owner_len + sd->group_len);
 120     else
 121         return NULL;
 122 }
 123
 124 /* gets the owner from a security descriptor */
 125 static inline const SID *sd_get_owner( const struct security_descriptor *sd )
 126 {
 127     if (sd->owner_len)
 128         return (const SID *)(sd + 1);
 129     else
 130         return NULL;
 131 }
 132
 133 /* gets the primary group from a security descriptor */
 134 static inline const SID *sd_get_group( const struct security_descriptor *sd )
 135 {
 136     if (sd->group_len)
 137         return (const SID *)((const char *)(sd + 1) + sd->owner_len);
 138     else
 139         return NULL;
 140 }
 141
 142 /* determines whether an object_attributes struct is valid in a buffer
 143  * and calls set_error appropriately */
 144 extern int objattr_is_valid( const struct object_attributes *objattr, data_size_t size );
 145 static inline void objattr_get_name( const struct object_attributes *objattr, struct unicode_str *name )
 146 {
 147     name->len = ((objattr->name_len) / sizeof(WCHAR)) * sizeof(WCHAR);
 148     name->str = (const WCHAR *)objattr + (sizeof(*objattr) + objattr->sd_len) / sizeof(WCHAR);
 149 }
 150
 151 #endif  /* __WINE_SERVER_SECURITY_H */