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 extern const LUID SeIncreaseQuotaPrivilege;
  22 extern const LUID SeSecurityPrivilege;
  23 extern const LUID SeTakeOwnershipPrivilege;
  24 extern const LUID SeLoadDriverPrivilege;
  25 extern const LUID SeSystemProfilePrivilege;
  26 extern const LUID SeSystemtimePrivilege;
  27 extern const LUID SeProfileSingleProcessPrivilege;
  28 extern const LUID SeIncreaseBasePriorityPrivilege;
  29 extern const LUID SeCreatePagefilePrivilege;
  30 extern const LUID SeBackupPrivilege;
  31 extern const LUID SeRestorePrivilege;
  32 extern const LUID SeShutdownPrivilege;
  33 extern const LUID SeDebugPrivilege;
  34 extern const LUID SeSystemEnvironmentPrivilege;
  35 extern const LUID SeChangeNotifyPrivilege;
  36 extern const LUID SeRemoteShutdownPrivilege;
  37 extern const LUID SeUndockPrivilege;
  38 extern const LUID SeManageVolumePrivilege;
  39 extern const LUID SeImpersonatePrivilege;
  40 extern const LUID SeCreateGlobalPrivilege;
  41
  42 extern const PSID security_world_sid;
  43 extern const PSID security_local_user_sid;
  44 extern const PSID security_local_system_sid;
  45
  46
  47 /* token functions */
  48
  49 extern struct token *token_create_admin(void);
  50 extern struct token *token_duplicate( struct token *src_token, unsigned primary,
  51                                       int impersonation_level );
  52 extern int token_check_privileges( struct token *token, int all_required,
  53                                    const LUID_AND_ATTRIBUTES *reqprivs,
  54                                    unsigned int count, LUID_AND_ATTRIBUTES *usedprivs);
  55 extern const ACL *token_get_default_dacl( struct token *token );
  56 extern const SID *token_get_user( struct token *token );
  57 extern const SID *token_get_primary_group( struct token *token );
  58 extern int token_sid_present( struct token *token, const SID *sid, int deny);
  59
  60 static inline const ACE_HEADER *ace_next( const ACE_HEADER *ace )
  61 {
  62     return (const ACE_HEADER *)((const char *)ace + ace->AceSize);
  63 }
  64
  65 static inline int security_equal_sid( const SID *sid1, const SID *sid2 )
  66 {
  67     return ((sid1->SubAuthorityCount == sid2->SubAuthorityCount) &&
  68             !memcmp( sid1, sid2, FIELD_OFFSET(SID, SubAuthority[sid1->SubAuthorityCount]) ));
  69 }
  70
  71 extern void security_set_thread_token( struct thread *thread, obj_handle_t handle );
  72 extern const SID *security_unix_uid_to_sid( uid_t uid );
  73 extern int check_object_access( struct object *obj, unsigned int *access );
  74
  75 static inline int thread_single_check_privilege( struct thread *thread, const LUID *priv)
  76 {
  77     struct token *token = thread_get_impersonation_token( thread );
  78     const LUID_AND_ATTRIBUTES privs = { *priv, 0 };
  79
  80     if (!token) return FALSE;
  81
  82     return token_check_privileges( token, TRUE, &privs, 1, NULL );
  83 }
  84
  85
  86 /* security descriptor helper functions */
  87
  88 extern int sd_is_valid( const struct security_descriptor *sd, data_size_t size );
  89
  90 /* gets the discretionary access control list from a security descriptor */
  91 static inline const ACL *sd_get_dacl( const struct security_descriptor *sd, int *present )
  92 {
  93     *present = (sd->control & SE_DACL_PRESENT ? TRUE : FALSE);
  94
  95     if (sd->dacl_len)
  96         return (const ACL *)((const char *)(sd + 1) +
  97             sd->owner_len + sd->group_len + sd->sacl_len);
  98     else
  99         return NULL;
 100 }
 101
 102 /* gets the system access control list from a security descriptor */
 103 static inline const ACL *sd_get_sacl( const struct security_descriptor *sd, int *present )
 104 {
 105     *present = (sd->control & SE_SACL_PRESENT ? TRUE : FALSE);
 106
 107     if (sd->sacl_len)
 108         return (const ACL *)((const char *)(sd + 1) +
 109             sd->owner_len + sd->group_len);
 110     else
 111         return NULL;
 112 }
 113
 114 /* gets the owner from a security descriptor */
 115 static inline const SID *sd_get_owner( const struct security_descriptor *sd )
 116 {
 117     if (sd->owner_len)
 118         return (const SID *)(sd + 1);
 119     else
 120         return NULL;
 121 }
 122
 123 /* gets the primary group from a security descriptor */
 124 static inline const SID *sd_get_group( const struct security_descriptor *sd )
 125 {
 126     if (sd->group_len)
 127         return (const SID *)((const char *)(sd + 1) + sd->owner_len);
 128     else
 129         return NULL;
 130 }
 131
 132 /* determines whether an object_attributes struct is valid in a buffer
 133  * and calls set_error appropriately */
 134 extern int objattr_is_valid( const struct object_attributes *objattr, data_size_t size );
 135 static inline void objattr_get_name( const struct object_attributes *objattr, struct unicode_str *name )
 136 {
 137     name->len = ((objattr->name_len) / sizeof(WCHAR)) * sizeof(WCHAR);
 138     name->str = (const WCHAR *)objattr + (sizeof(*objattr) + objattr->sd_len) / sizeof(WCHAR);
 139 }