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wine/server/token.c
Michael Stefaniuc 794ad90982 server: Avoid TRUE:FALSE conditional expressions.
2012-08-13 11:50:16 +02:00

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/*
* Tokens
*
* Copyright (C) 1998 Alexandre Julliard
* Copyright (C) 2003 Mike McCormack
* Copyright (C) 2005 Robert Shearman
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "winternl.h"
#include "handle.h"
#include "thread.h"
#include "process.h"
#include "request.h"
#include "security.h"
#include "wine/unicode.h"
#define MAX_SUBAUTH_COUNT 1
const LUID SeIncreaseQuotaPrivilege = { 5, 0 };
const LUID SeSecurityPrivilege = { 8, 0 };
const LUID SeTakeOwnershipPrivilege = { 9, 0 };
const LUID SeLoadDriverPrivilege = { 10, 0 };
const LUID SeSystemProfilePrivilege = { 11, 0 };
const LUID SeSystemtimePrivilege = { 12, 0 };
const LUID SeProfileSingleProcessPrivilege = { 13, 0 };
const LUID SeIncreaseBasePriorityPrivilege = { 14, 0 };
const LUID SeCreatePagefilePrivilege = { 15, 0 };
const LUID SeBackupPrivilege = { 17, 0 };
const LUID SeRestorePrivilege = { 18, 0 };
const LUID SeShutdownPrivilege = { 19, 0 };
const LUID SeDebugPrivilege = { 20, 0 };
const LUID SeSystemEnvironmentPrivilege = { 22, 0 };
const LUID SeChangeNotifyPrivilege = { 23, 0 };
const LUID SeRemoteShutdownPrivilege = { 24, 0 };
const LUID SeUndockPrivilege = { 25, 0 };
const LUID SeManageVolumePrivilege = { 28, 0 };
const LUID SeImpersonatePrivilege = { 29, 0 };
const LUID SeCreateGlobalPrivilege = { 30, 0 };
static const SID world_sid = { SID_REVISION, 1, { SECURITY_WORLD_SID_AUTHORITY }, { SECURITY_WORLD_RID } };
static const SID local_sid = { SID_REVISION, 1, { SECURITY_LOCAL_SID_AUTHORITY }, { SECURITY_LOCAL_RID } };
static const SID interactive_sid = { SID_REVISION, 1, { SECURITY_NT_AUTHORITY }, { SECURITY_INTERACTIVE_RID } };
static const SID anonymous_logon_sid = { SID_REVISION, 1, { SECURITY_NT_AUTHORITY }, { SECURITY_ANONYMOUS_LOGON_RID } };
static const SID authenticated_user_sid = { SID_REVISION, 1, { SECURITY_NT_AUTHORITY }, { SECURITY_AUTHENTICATED_USER_RID } };
static const SID local_system_sid = { SID_REVISION, 1, { SECURITY_NT_AUTHORITY }, { SECURITY_LOCAL_SYSTEM_RID } };
static const struct /* same fields as struct SID */
{
BYTE Revision;
BYTE SubAuthorityCount;
SID_IDENTIFIER_AUTHORITY IdentifierAuthority;
DWORD SubAuthority[5];
} local_user_sid = { SID_REVISION, 5, { SECURITY_NT_AUTHORITY }, { SECURITY_NT_NON_UNIQUE, 0, 0, 0, 1000 } };
const PSID security_world_sid = (PSID)&world_sid;
static const PSID security_local_sid = (PSID)&local_sid;
static const PSID security_interactive_sid = (PSID)&interactive_sid;
static const PSID security_authenticated_user_sid = (PSID)&authenticated_user_sid;
const PSID security_local_system_sid = (PSID)&local_system_sid;
const PSID security_local_user_sid = (PSID)&local_user_sid;
static luid_t prev_luid_value = { 1000, 0 };
struct token
{
struct object obj; /* object header */
luid_t token_id; /* system-unique id of token */
luid_t modified_id; /* new id allocated every time token is modified */
struct list privileges; /* privileges available to the token */
struct list groups; /* groups that the user of this token belongs to (sid_and_attributes) */
SID *user; /* SID of user this token represents */
SID *primary_group; /* SID of user's primary group */
unsigned primary; /* is this a primary or impersonation token? */
ACL *default_dacl; /* the default DACL to assign to objects created by this user */
TOKEN_SOURCE source; /* source of the token */
int impersonation_level; /* impersonation level this token is capable of if non-primary token */
};
struct privilege
{
struct list entry;
LUID luid;
unsigned enabled : 1; /* is the privilege currently enabled? */
unsigned def : 1; /* is the privilege enabled by default? */
};
struct group
{
struct list entry;
unsigned enabled : 1; /* is the sid currently enabled? */
unsigned def : 1; /* is the sid enabled by default? */
unsigned logon : 1; /* is this a logon sid? */
unsigned mandatory: 1; /* is this sid always enabled? */
unsigned owner : 1; /* can this sid be an owner of an object? */
unsigned resource : 1; /* is this a domain-local group? */
unsigned deny_only: 1; /* is this a sid that should be use for denying only? */
SID sid;
};
static void token_dump( struct object *obj, int verbose );
static unsigned int token_map_access( struct object *obj, unsigned int access );
static void token_destroy( struct object *obj );
static const struct object_ops token_ops =
{
sizeof(struct token), /* size */
token_dump, /* dump */
no_get_type, /* get_type */
no_add_queue, /* add_queue */
NULL, /* remove_queue */
NULL, /* signaled */
NULL, /* satisfied */
no_signal, /* signal */
no_get_fd, /* get_fd */
token_map_access, /* map_access */
default_get_sd, /* get_sd */
default_set_sd, /* set_sd */
no_lookup_name, /* lookup_name */
no_open_file, /* open_file */
no_close_handle, /* close_handle */
token_destroy /* destroy */
};
static void token_dump( struct object *obj, int verbose )
{
fprintf( stderr, "Security token\n" );
/* FIXME: dump token members */
}
static unsigned int token_map_access( struct object *obj, unsigned int access )
{
if (access & GENERIC_READ) access |= TOKEN_READ;
if (access & GENERIC_WRITE) access |= TOKEN_WRITE;
if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
if (access & GENERIC_ALL) access |= TOKEN_ALL_ACCESS;
return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
}
static SID *security_sid_alloc( const SID_IDENTIFIER_AUTHORITY *idauthority, int subauthcount, const unsigned int subauth[] )
{
int i;
SID *sid = mem_alloc( FIELD_OFFSET(SID, SubAuthority[subauthcount]) );
if (!sid) return NULL;
sid->Revision = SID_REVISION;
sid->SubAuthorityCount = subauthcount;
sid->IdentifierAuthority = *idauthority;
for (i = 0; i < subauthcount; i++)
sid->SubAuthority[i] = subauth[i];
return sid;
}
void security_set_thread_token( struct thread *thread, obj_handle_t handle )
{
if (!handle)
{
if (thread->token)
release_object( thread->token );
thread->token = NULL;
}
else
{
struct token *token = (struct token *)get_handle_obj( current->process,
handle,
TOKEN_IMPERSONATE,
&token_ops );
if (token)
{
if (thread->token)
release_object( thread->token );
thread->token = token;
}
}
}
const SID *security_unix_uid_to_sid( uid_t uid )
{
/* very simple mapping: either the current user or not the current user */
if (uid == getuid())
return (const SID *)&local_user_sid;
else
return &anonymous_logon_sid;
}
static int acl_is_valid( const ACL *acl, data_size_t size )
{
ULONG i;
const ACE_HEADER *ace;
if (size < sizeof(ACL))
return FALSE;
size = min(size, MAX_ACL_LEN);
size -= sizeof(ACL);
ace = (const ACE_HEADER *)(acl + 1);
for (i = 0; i < acl->AceCount; i++)
{
const SID *sid;
data_size_t sid_size;
if (size < sizeof(ACE_HEADER))
return FALSE;
if (size < ace->AceSize)
return FALSE;
size -= ace->AceSize;
switch (ace->AceType)
{
case ACCESS_DENIED_ACE_TYPE:
sid = (const SID *)&((const ACCESS_DENIED_ACE *)ace)->SidStart;
sid_size = ace->AceSize - FIELD_OFFSET(ACCESS_DENIED_ACE, SidStart);
break;
case ACCESS_ALLOWED_ACE_TYPE:
sid = (const SID *)&((const ACCESS_ALLOWED_ACE *)ace)->SidStart;
sid_size = ace->AceSize - FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart);
break;
case SYSTEM_AUDIT_ACE_TYPE:
sid = (const SID *)&((const SYSTEM_AUDIT_ACE *)ace)->SidStart;
sid_size = ace->AceSize - FIELD_OFFSET(SYSTEM_AUDIT_ACE, SidStart);
break;
case SYSTEM_ALARM_ACE_TYPE:
sid = (const SID *)&((const SYSTEM_ALARM_ACE *)ace)->SidStart;
sid_size = ace->AceSize - FIELD_OFFSET(SYSTEM_ALARM_ACE, SidStart);
break;
default:
return FALSE;
}
if (sid_size < FIELD_OFFSET(SID, SubAuthority[0]) ||
sid_size < FIELD_OFFSET(SID, SubAuthority[sid->SubAuthorityCount]))
return FALSE;
ace = ace_next( ace );
}
return TRUE;
}
/* checks whether all members of a security descriptor fit inside the size
* of memory specified */
int sd_is_valid( const struct security_descriptor *sd, data_size_t size )
{
size_t offset = sizeof(struct security_descriptor);
const SID *group;
const SID *owner;
const ACL *sacl;
const ACL *dacl;
int dummy;
if (size < offset)
return FALSE;
if ((sd->owner_len >= FIELD_OFFSET(SID, SubAuthority[255])) ||
(offset + sd->owner_len > size))
return FALSE;
owner = sd_get_owner( sd );
if (owner)
{
size_t needed_size = FIELD_OFFSET(SID, SubAuthority[owner->SubAuthorityCount]);
if ((sd->owner_len < sizeof(SID)) || (needed_size > sd->owner_len))
return FALSE;
}
offset += sd->owner_len;
if ((sd->group_len >= FIELD_OFFSET(SID, SubAuthority[255])) ||
(offset + sd->group_len > size))
return FALSE;
group = sd_get_group( sd );
if (group)
{
size_t needed_size = FIELD_OFFSET(SID, SubAuthority[group->SubAuthorityCount]);
if ((sd->group_len < sizeof(SID)) || (needed_size > sd->group_len))
return FALSE;
}
offset += sd->group_len;
if ((sd->sacl_len >= MAX_ACL_LEN) || (offset + sd->sacl_len > size))
return FALSE;
sacl = sd_get_sacl( sd, &dummy );
if (sacl && !acl_is_valid( sacl, sd->sacl_len ))
return FALSE;
offset += sd->sacl_len;
if ((sd->dacl_len >= MAX_ACL_LEN) || (offset + sd->dacl_len > size))
return FALSE;
dacl = sd_get_dacl( sd, &dummy );
if (dacl && !acl_is_valid( dacl, sd->dacl_len ))
return FALSE;
offset += sd->dacl_len;
return TRUE;
}
/* determines whether an object_attributes struct is valid in a buffer
* and calls set_error appropriately */
int objattr_is_valid( const struct object_attributes *objattr, data_size_t size )
{
if ((size < sizeof(*objattr)) || (size - sizeof(*objattr) < objattr->sd_len) ||
(size - sizeof(*objattr) - objattr->sd_len < objattr->name_len))
{
set_error( STATUS_ACCESS_VIOLATION );
return FALSE;
}
if (objattr->sd_len)
{
const struct security_descriptor *sd = (const struct security_descriptor *)(objattr + 1);
if (!sd_is_valid( sd, objattr->sd_len ))
{
set_error( STATUS_INVALID_SECURITY_DESCR );
return FALSE;
}
}
return TRUE;
}
/* maps from generic rights to specific rights as given by a mapping */
static inline void map_generic_mask(unsigned int *mask, const GENERIC_MAPPING *mapping)
{
if (*mask & GENERIC_READ) *mask |= mapping->GenericRead;
if (*mask & GENERIC_WRITE) *mask |= mapping->GenericWrite;
if (*mask & GENERIC_EXECUTE) *mask |= mapping->GenericExecute;
if (*mask & GENERIC_ALL) *mask |= mapping->GenericAll;
*mask &= 0x0FFFFFFF;
}
static inline int is_equal_luid( const LUID *luid1, const LUID *luid2 )
{
return (luid1->LowPart == luid2->LowPart && luid1->HighPart == luid2->HighPart);
}
static inline void allocate_luid( luid_t *luid )
{
prev_luid_value.low_part++;
*luid = prev_luid_value;
}
DECL_HANDLER( allocate_locally_unique_id )
{
allocate_luid( &reply->luid );
}
static inline void luid_and_attr_from_privilege( LUID_AND_ATTRIBUTES *out, const struct privilege *in)
{
out->Luid = in->luid;
out->Attributes =
(in->enabled ? SE_PRIVILEGE_ENABLED : 0) |
(in->def ? SE_PRIVILEGE_ENABLED_BY_DEFAULT : 0);
}
static struct privilege *privilege_add( struct token *token, const LUID *luid, int enabled )
{
struct privilege *privilege = mem_alloc( sizeof(*privilege) );
if (privilege)
{
privilege->luid = *luid;
privilege->def = privilege->enabled = (enabled != 0);
list_add_tail( &token->privileges, &privilege->entry );
}
return privilege;
}
static inline void privilege_remove( struct privilege *privilege )
{
list_remove( &privilege->entry );
free( privilege );
}
static void token_destroy( struct object *obj )
{
struct token* token;
struct list *cursor, *cursor_next;
assert( obj->ops == &token_ops );
token = (struct token *)obj;
free( token->user );
LIST_FOR_EACH_SAFE( cursor, cursor_next, &token->privileges )
{
struct privilege *privilege = LIST_ENTRY( cursor, struct privilege, entry );
privilege_remove( privilege );
}
LIST_FOR_EACH_SAFE( cursor, cursor_next, &token->groups )
{
struct group *group = LIST_ENTRY( cursor, struct group, entry );
list_remove( &group->entry );
free( group );
}
free( token->default_dacl );
}
/* creates a new token.
* groups may be NULL if group_count is 0.
* privs may be NULL if priv_count is 0.
* default_dacl may be NULL, indicating that all objects created by the user
* are unsecured.
* modified_id may be NULL, indicating that a new modified_id luid should be
* allocated.
*/
static struct token *create_token( unsigned primary, const SID *user,
const SID_AND_ATTRIBUTES *groups, unsigned int group_count,
const LUID_AND_ATTRIBUTES *privs, unsigned int priv_count,
const ACL *default_dacl, TOKEN_SOURCE source,
const luid_t *modified_id,
int impersonation_level )
{
struct token *token = alloc_object( &token_ops );
if (token)
{
unsigned int i;
allocate_luid( &token->token_id );
if (modified_id)
token->modified_id = *modified_id;
else
allocate_luid( &token->modified_id );
list_init( &token->privileges );
list_init( &token->groups );
token->primary = primary;
/* primary tokens don't have impersonation levels */
if (primary)
token->impersonation_level = -1;
else
token->impersonation_level = impersonation_level;
token->default_dacl = NULL;
token->primary_group = NULL;
/* copy user */
token->user = memdup( user, FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) );
if (!token->user)
{
release_object( token );
return NULL;
}
/* copy groups */
for (i = 0; i < group_count; i++)
{
size_t size = FIELD_OFFSET( struct group, sid.SubAuthority[((const SID *)groups[i].Sid)->SubAuthorityCount] );
struct group *group = mem_alloc( size );
if (!group)
{
release_object( token );
return NULL;
}
memcpy( &group->sid, groups[i].Sid, FIELD_OFFSET( SID, SubAuthority[((const SID *)groups[i].Sid)->SubAuthorityCount] ) );
group->enabled = TRUE;
group->def = TRUE;
group->logon = (groups[i].Attributes & SE_GROUP_LOGON_ID) != 0;
group->mandatory = (groups[i].Attributes & SE_GROUP_MANDATORY) != 0;
group->owner = (groups[i].Attributes & SE_GROUP_OWNER) != 0;
group->resource = FALSE;
group->deny_only = FALSE;
list_add_tail( &token->groups, &group->entry );
/* Use first owner capable group as an owner */
if (!token->primary_group && group->owner)
token->primary_group = &group->sid;
}
/* copy privileges */
for (i = 0; i < priv_count; i++)
{
/* note: we don't check uniqueness: the caller must make sure
* privs doesn't contain any duplicate luids */
if (!privilege_add( token, &privs[i].Luid,
privs[i].Attributes & SE_PRIVILEGE_ENABLED ))
{
release_object( token );
return NULL;
}
}
if (default_dacl)
{
token->default_dacl = memdup( default_dacl, default_dacl->AclSize );
if (!token->default_dacl)
{
release_object( token );
return NULL;
}
}
token->source = source;
}
return token;
}
struct token *token_duplicate( struct token *src_token, unsigned primary,
int impersonation_level )
{
const luid_t *modified_id =
primary || (impersonation_level == src_token->impersonation_level) ?
&src_token->modified_id : NULL;
struct token *token = NULL;
struct privilege *privilege;
struct group *group;
if (!primary &&
(impersonation_level < SecurityAnonymous ||
impersonation_level > SecurityDelegation ||
(!src_token->primary && (impersonation_level > src_token->impersonation_level))))
{
set_error( STATUS_BAD_IMPERSONATION_LEVEL );
return NULL;
}
token = create_token( primary, src_token->user, NULL, 0,
NULL, 0, src_token->default_dacl,
src_token->source, modified_id,
impersonation_level );
if (!token) return token;
/* copy groups */
LIST_FOR_EACH_ENTRY( group, &src_token->groups, struct group, entry )
{
size_t size = FIELD_OFFSET( struct group, sid.SubAuthority[group->sid.SubAuthorityCount] );
struct group *newgroup = mem_alloc( size );
if (!newgroup)
{
release_object( token );
return NULL;
}
memcpy( newgroup, group, size );
list_add_tail( &token->groups, &newgroup->entry );
}
token->primary_group = src_token->primary_group;
assert( token->primary_group );
/* copy privileges */
LIST_FOR_EACH_ENTRY( privilege, &src_token->privileges, struct privilege, entry )
if (!privilege_add( token, &privilege->luid, privilege->enabled ))
{
release_object( token );
return NULL;
}
return token;
}
static ACL *create_default_dacl( const SID *user )
{
ACCESS_ALLOWED_ACE *aaa;
ACL *default_dacl;
SID *sid;
size_t default_dacl_size = sizeof(ACL) +
2*(sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD)) +
sizeof(local_system_sid) +
FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
default_dacl = mem_alloc( default_dacl_size );
if (!default_dacl) return NULL;
default_dacl->AclRevision = ACL_REVISION;
default_dacl->Sbz1 = 0;
default_dacl->AclSize = default_dacl_size;
default_dacl->AceCount = 2;
default_dacl->Sbz2 = 0;
/* GENERIC_ALL for Local System */
aaa = (ACCESS_ALLOWED_ACE *)(default_dacl + 1);
aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
aaa->Header.AceFlags = 0;
aaa->Header.AceSize = (sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD)) +
sizeof(local_system_sid);
aaa->Mask = GENERIC_ALL;
sid = (SID *)&aaa->SidStart;
memcpy( sid, &local_system_sid, sizeof(local_system_sid) );
/* GENERIC_ALL for specified user */
aaa = (ACCESS_ALLOWED_ACE *)((char *)aaa + aaa->Header.AceSize);
aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
aaa->Header.AceFlags = 0;
aaa->Header.AceSize = (sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD)) +
FIELD_OFFSET( SID, SubAuthority[user->SubAuthorityCount] );
aaa->Mask = GENERIC_ALL;
sid = (SID *)&aaa->SidStart;
memcpy( sid, user, FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) );
return default_dacl;
}
struct sid_data
{
SID_IDENTIFIER_AUTHORITY idauth;
int count;
unsigned int subauth[MAX_SUBAUTH_COUNT];
};
struct token *token_create_admin( void )
{
struct token *token = NULL;
static const SID_IDENTIFIER_AUTHORITY nt_authority = { SECURITY_NT_AUTHORITY };
static const unsigned int alias_admins_subauth[] = { SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS };
static const unsigned int alias_users_subauth[] = { SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_USERS };
/* on Windows, this value changes every time the user logs on */
static const unsigned int logon_subauth[] = { SECURITY_LOGON_IDS_RID, 0, 1 /* FIXME: should be randomly generated when tokens are inherited by new processes */ };
PSID alias_admins_sid;
PSID alias_users_sid;
PSID logon_sid;
/* note: should be the owner specified in the token */
ACL *default_dacl = create_default_dacl( &interactive_sid );
alias_admins_sid = security_sid_alloc( &nt_authority, sizeof(alias_admins_subauth)/sizeof(alias_admins_subauth[0]),
alias_admins_subauth );
alias_users_sid = security_sid_alloc( &nt_authority, sizeof(alias_users_subauth)/sizeof(alias_users_subauth[0]),
alias_users_subauth );
logon_sid = security_sid_alloc( &nt_authority, sizeof(logon_subauth)/sizeof(logon_subauth[0]),
logon_subauth );
if (alias_admins_sid && alias_users_sid && logon_sid && default_dacl)
{
const LUID_AND_ATTRIBUTES admin_privs[] =
{
{ SeChangeNotifyPrivilege , SE_PRIVILEGE_ENABLED },
{ SeSecurityPrivilege , 0 },
{ SeBackupPrivilege , 0 },
{ SeRestorePrivilege , 0 },
{ SeSystemtimePrivilege , 0 },
{ SeShutdownPrivilege , 0 },
{ SeRemoteShutdownPrivilege , 0 },
{ SeTakeOwnershipPrivilege , 0 },
{ SeDebugPrivilege , 0 },
{ SeSystemEnvironmentPrivilege , 0 },
{ SeSystemProfilePrivilege , 0 },
{ SeProfileSingleProcessPrivilege, 0 },
{ SeIncreaseBasePriorityPrivilege, 0 },
{ SeLoadDriverPrivilege , SE_PRIVILEGE_ENABLED },
{ SeCreatePagefilePrivilege , 0 },
{ SeIncreaseQuotaPrivilege , 0 },
{ SeUndockPrivilege , 0 },
{ SeManageVolumePrivilege , 0 },
{ SeImpersonatePrivilege , SE_PRIVILEGE_ENABLED },
{ SeCreateGlobalPrivilege , SE_PRIVILEGE_ENABLED },
};
/* note: we don't include non-builtin groups here for the user -
* telling us these is the job of a client-side program */
const SID_AND_ATTRIBUTES admin_groups[] =
{
{ security_world_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
{ security_local_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
{ security_interactive_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
{ security_authenticated_user_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
{ alias_admins_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY|SE_GROUP_OWNER },
{ alias_users_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
{ logon_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY|SE_GROUP_LOGON_ID },
};
static const TOKEN_SOURCE admin_source = {"SeMgr", {0, 0}};
token = create_token( TRUE, security_unix_uid_to_sid( getuid() ),
admin_groups, sizeof(admin_groups)/sizeof(admin_groups[0]),
admin_privs, sizeof(admin_privs)/sizeof(admin_privs[0]),
default_dacl, admin_source, NULL, -1 );
/* we really need a primary group */
assert( token->primary_group );
}
free( logon_sid );
free( alias_admins_sid );
free( alias_users_sid );
free( default_dacl );
return token;
}
static struct privilege *token_find_privilege( struct token *token, const LUID *luid, int enabled_only )
{
struct privilege *privilege;
LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
{
if (is_equal_luid( luid, &privilege->luid ))
{
if (enabled_only && !privilege->enabled)
return NULL;
return privilege;
}
}
return NULL;
}
static unsigned int token_adjust_privileges( struct token *token, const LUID_AND_ATTRIBUTES *privs,
unsigned int count, LUID_AND_ATTRIBUTES *mod_privs,
unsigned int mod_privs_count )
{
unsigned int i, modified_count = 0;
/* mark as modified */
allocate_luid( &token->modified_id );
for (i = 0; i < count; i++)
{
struct privilege *privilege =
token_find_privilege( token, &privs[i].Luid, FALSE );
if (!privilege)
{
set_error( STATUS_NOT_ALL_ASSIGNED );
continue;
}
if (privs[i].Attributes & SE_PRIVILEGE_REMOVED)
privilege_remove( privilege );
else
{
/* save previous state for caller */
if (mod_privs_count)
{
luid_and_attr_from_privilege(mod_privs, privilege);
mod_privs++;
mod_privs_count--;
modified_count++;
}
if (privs[i].Attributes & SE_PRIVILEGE_ENABLED)
privilege->enabled = TRUE;
else
privilege->enabled = FALSE;
}
}
return modified_count;
}
static void token_disable_privileges( struct token *token )
{
struct privilege *privilege;
/* mark as modified */
allocate_luid( &token->modified_id );
LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
privilege->enabled = FALSE;
}
int token_check_privileges( struct token *token, int all_required,
const LUID_AND_ATTRIBUTES *reqprivs,
unsigned int count, LUID_AND_ATTRIBUTES *usedprivs)
{
unsigned int i, enabled_count = 0;
for (i = 0; i < count; i++)
{
struct privilege *privilege =
token_find_privilege( token, &reqprivs[i].Luid, TRUE );
if (usedprivs)
usedprivs[i] = reqprivs[i];
if (privilege && privilege->enabled)
{
enabled_count++;
if (usedprivs)
usedprivs[i].Attributes |= SE_PRIVILEGE_USED_FOR_ACCESS;
}
}
if (all_required)
return (enabled_count == count);
else
return (enabled_count > 0);
}
int token_sid_present( struct token *token, const SID *sid, int deny )
{
struct group *group;
if (security_equal_sid( token->user, sid )) return TRUE;
LIST_FOR_EACH_ENTRY( group, &token->groups, struct group, entry )
{
if (!group->enabled) continue;
if (group->deny_only && !deny) continue;
if (security_equal_sid( &group->sid, sid )) return TRUE;
}
return FALSE;
}
/* Checks access to a security descriptor. 'sd' must have been validated by
* caller. It returns STATUS_SUCCESS if call succeeded or an error indicating
* the reason. 'status' parameter will indicate if access is granted or denied.
*
* If both returned value and 'status' are STATUS_SUCCESS then access is granted.
*/
static unsigned int token_access_check( struct token *token,
const struct security_descriptor *sd,
unsigned int desired_access,
LUID_AND_ATTRIBUTES *privs,
unsigned int *priv_count,
const GENERIC_MAPPING *mapping,
unsigned int *granted_access,
unsigned int *status )
{
unsigned int current_access = 0;
unsigned int denied_access = 0;
ULONG i;
const ACL *dacl;
int dacl_present;
const ACE_HEADER *ace;
const SID *owner;
/* assume no access rights */
*granted_access = 0;
/* fail if desired_access contains generic rights */
if (desired_access & (GENERIC_READ|GENERIC_WRITE|GENERIC_EXECUTE|GENERIC_ALL))
{
*priv_count = 0;
return STATUS_GENERIC_NOT_MAPPED;
}
dacl = sd_get_dacl( sd, &dacl_present );
owner = sd_get_owner( sd );
if (!owner || !sd_get_group( sd ))
{
*priv_count = 0;
return STATUS_INVALID_SECURITY_DESCR;
}
/* 1: Grant desired access if the object is unprotected */
if (!dacl_present || !dacl)
{
*priv_count = 0;
*granted_access = desired_access;
return *status = STATUS_SUCCESS;
}
/* 2: Check if caller wants access to system security part. Note: access
* is only granted if specifically asked for */
if (desired_access & ACCESS_SYSTEM_SECURITY)
{
const LUID_AND_ATTRIBUTES security_priv = { SeSecurityPrivilege, 0 };
LUID_AND_ATTRIBUTES retpriv = security_priv;
if (token_check_privileges( token, TRUE, &security_priv, 1, &retpriv ))
{
if (priv_count)
{
/* assumes that there will only be one privilege to return */
if (*priv_count >= 1)
{
*priv_count = 1;
*privs = retpriv;
}
else
{
*priv_count = 1;
return STATUS_BUFFER_TOO_SMALL;
}
}
current_access |= ACCESS_SYSTEM_SECURITY;
if (desired_access == current_access)
{
*granted_access = current_access;
return *status = STATUS_SUCCESS;
}
}
else
{
*priv_count = 0;
*status = STATUS_PRIVILEGE_NOT_HELD;
return STATUS_SUCCESS;
}
}
else if (priv_count) *priv_count = 0;
/* 3: Check whether the token is the owner */
/* NOTE: SeTakeOwnershipPrivilege is not checked for here - it is instead
* checked when a "set owner" call is made, overriding the access rights
* determined here. */
if (token_sid_present( token, owner, FALSE ))
{
current_access |= (READ_CONTROL | WRITE_DAC);
if (desired_access == current_access)
{
*granted_access = current_access;
return *status = STATUS_SUCCESS;
}
}
/* 4: Grant rights according to the DACL */
ace = (const ACE_HEADER *)(dacl + 1);
for (i = 0; i < dacl->AceCount; i++, ace = ace_next( ace ))
{
const ACCESS_ALLOWED_ACE *aa_ace;
const ACCESS_DENIED_ACE *ad_ace;
const SID *sid;
if (ace->AceFlags & INHERIT_ONLY_ACE)
continue;
switch (ace->AceType)
{
case ACCESS_DENIED_ACE_TYPE:
ad_ace = (const ACCESS_DENIED_ACE *)ace;
sid = (const SID *)&ad_ace->SidStart;
if (token_sid_present( token, sid, TRUE ))
{
unsigned int access = ad_ace->Mask;
map_generic_mask(&access, mapping);
if (desired_access & MAXIMUM_ALLOWED)
denied_access |= access;
else
{
denied_access |= (access & ~current_access);
if (desired_access & access) goto done;
}
}
break;
case ACCESS_ALLOWED_ACE_TYPE:
aa_ace = (const ACCESS_ALLOWED_ACE *)ace;
sid = (const SID *)&aa_ace->SidStart;
if (token_sid_present( token, sid, FALSE ))
{
unsigned int access = aa_ace->Mask;
map_generic_mask(&access, mapping);
if (desired_access & MAXIMUM_ALLOWED)
current_access |= access;
else
current_access |= (access & ~denied_access);
}
break;
}
/* don't bother carrying on checking if we've already got all of
* rights we need */
if (desired_access == *granted_access)
break;
}
done:
if (desired_access & MAXIMUM_ALLOWED)
*granted_access = current_access & ~denied_access;
else
if ((current_access & desired_access) == desired_access)
*granted_access = current_access & desired_access;
else
*granted_access = 0;
*status = *granted_access ? STATUS_SUCCESS : STATUS_ACCESS_DENIED;
return STATUS_SUCCESS;
}
const ACL *token_get_default_dacl( struct token *token )
{
return token->default_dacl;
}
const SID *token_get_user( struct token *token )
{
return token->user;
}
const SID *token_get_primary_group( struct token *token )
{
return token->primary_group;
}
int check_object_access(struct object *obj, unsigned int *access)
{
GENERIC_MAPPING mapping;
struct token *token = current->token ? current->token : current->process->token;
LUID_AND_ATTRIBUTES priv;
unsigned int status, priv_count = 1;
int res;
mapping.GenericAll = obj->ops->map_access( obj, GENERIC_ALL );
if (!obj->sd)
{
if (*access & MAXIMUM_ALLOWED)
*access = mapping.GenericAll;
return TRUE;
}
mapping.GenericRead = obj->ops->map_access( obj, GENERIC_READ );
mapping.GenericWrite = obj->ops->map_access( obj, GENERIC_WRITE );
mapping.GenericExecute = obj->ops->map_access( obj, GENERIC_EXECUTE );
res = token_access_check( token, obj->sd, *access, &priv, &priv_count,
&mapping, access, &status ) == STATUS_SUCCESS &&
status == STATUS_SUCCESS;
if (!res) set_error( STATUS_ACCESS_DENIED );
return res;
}
/* open a security token */
DECL_HANDLER(open_token)
{
if (req->flags & OPEN_TOKEN_THREAD)
{
struct thread *thread = get_thread_from_handle( req->handle, 0 );
if (thread)
{
if (thread->token)
{
if (!thread->token->primary && thread->token->impersonation_level <= SecurityAnonymous)
set_error( STATUS_CANT_OPEN_ANONYMOUS );
else
reply->token = alloc_handle( current->process, thread->token,
req->access, req->attributes );
}
else
set_error( STATUS_NO_TOKEN );
release_object( thread );
}
}
else
{
struct process *process = get_process_from_handle( req->handle, 0 );
if (process)
{
if (process->token)
reply->token = alloc_handle( current->process, process->token, req->access,
req->attributes );
else
set_error( STATUS_NO_TOKEN );
release_object( process );
}
}
}
/* adjust the privileges held by a token */
DECL_HANDLER(adjust_token_privileges)
{
struct token *token;
unsigned int access = TOKEN_ADJUST_PRIVILEGES;
if (req->get_modified_state) access |= TOKEN_QUERY;
if ((token = (struct token *)get_handle_obj( current->process, req->handle,
access, &token_ops )))
{
const LUID_AND_ATTRIBUTES *privs = get_req_data();
LUID_AND_ATTRIBUTES *modified_privs = NULL;
unsigned int priv_count = get_req_data_size() / sizeof(LUID_AND_ATTRIBUTES);
unsigned int modified_priv_count = 0;
if (req->get_modified_state && !req->disable_all)
{
unsigned int i;
/* count modified privs */
for (i = 0; i < priv_count; i++)
{
struct privilege *privilege =
token_find_privilege( token, &privs[i].Luid, FALSE );
if (privilege && req->get_modified_state)
modified_priv_count++;
}
reply->len = modified_priv_count;
modified_priv_count = min( modified_priv_count, get_reply_max_size() / sizeof(*modified_privs) );
if (modified_priv_count)
modified_privs = set_reply_data_size( modified_priv_count * sizeof(*modified_privs) );
}
reply->len = modified_priv_count * sizeof(*modified_privs);
if (req->disable_all)
token_disable_privileges( token );
else
modified_priv_count = token_adjust_privileges( token, privs,
priv_count, modified_privs, modified_priv_count );
release_object( token );
}
}
/* retrieves the list of privileges that may be held be the token */
DECL_HANDLER(get_token_privileges)
{
struct token *token;
if ((token = (struct token *)get_handle_obj( current->process, req->handle,
TOKEN_QUERY,
&token_ops )))
{
int priv_count = 0;
LUID_AND_ATTRIBUTES *privs;
struct privilege *privilege;
LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
priv_count++;
reply->len = priv_count * sizeof(*privs);
if (reply->len <= get_reply_max_size())
{
privs = set_reply_data_size( priv_count * sizeof(*privs) );
if (privs)
{
int i = 0;
LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
{
luid_and_attr_from_privilege( &privs[i], privilege );
i++;
}
}
}
else
set_error(STATUS_BUFFER_TOO_SMALL);
release_object( token );
}
}
/* creates a duplicate of the token */
DECL_HANDLER(duplicate_token)
{
struct token *src_token;
if ((src_token = (struct token *)get_handle_obj( current->process, req->handle,
TOKEN_DUPLICATE,
&token_ops )))
{
struct token *token = token_duplicate( src_token, req->primary, req->impersonation_level );
if (token)
{
reply->new_handle = alloc_handle( current->process, token, req->access, req->attributes);
release_object( token );
}
release_object( src_token );
}
}
/* checks the specified privileges are held by the token */
DECL_HANDLER(check_token_privileges)
{
struct token *token;
if ((token = (struct token *)get_handle_obj( current->process, req->handle,
TOKEN_QUERY,
&token_ops )))
{
unsigned int count = get_req_data_size() / sizeof(LUID_AND_ATTRIBUTES);
if (!token->primary && token->impersonation_level <= SecurityAnonymous)
set_error( STATUS_BAD_IMPERSONATION_LEVEL );
else if (get_reply_max_size() >= count * sizeof(LUID_AND_ATTRIBUTES))
{
LUID_AND_ATTRIBUTES *usedprivs = set_reply_data_size( count * sizeof(*usedprivs) );
reply->has_privileges = token_check_privileges( token, req->all_required, get_req_data(), count, usedprivs );
}
else
set_error( STATUS_BUFFER_OVERFLOW );
release_object( token );
}
}
/* checks that a user represented by a token is allowed to access an object
* represented by a security descriptor */
DECL_HANDLER(access_check)
{
data_size_t sd_size = get_req_data_size();
const struct security_descriptor *sd = get_req_data();
struct token *token;
if (!sd_is_valid( sd, sd_size ))
{
set_error( STATUS_ACCESS_VIOLATION );
return;
}
if ((token = (struct token *)get_handle_obj( current->process, req->handle,
TOKEN_QUERY,
&token_ops )))
{
GENERIC_MAPPING mapping;
unsigned int status;
LUID_AND_ATTRIBUTES priv;
unsigned int priv_count = 1;
memset(&priv, 0, sizeof(priv));
/* only impersonation tokens may be used with this function */
if (token->primary)
{
set_error( STATUS_NO_IMPERSONATION_TOKEN );
release_object( token );
return;
}
/* anonymous impersonation tokens can't be used */
if (token->impersonation_level <= SecurityAnonymous)
{
set_error( STATUS_BAD_IMPERSONATION_LEVEL );
release_object( token );
return;
}
mapping.GenericRead = req->mapping_read;
mapping.GenericWrite = req->mapping_write;
mapping.GenericExecute = req->mapping_execute;
mapping.GenericAll = req->mapping_all;
status = token_access_check(
token, sd, req->desired_access, &priv, &priv_count, &mapping,
&reply->access_granted, &reply->access_status );
reply->privileges_len = priv_count*sizeof(LUID_AND_ATTRIBUTES);
if ((priv_count > 0) && (reply->privileges_len <= get_reply_max_size()))
{
LUID_AND_ATTRIBUTES *privs = set_reply_data_size( priv_count * sizeof(*privs) );
memcpy( privs, &priv, sizeof(priv) );
}
set_error( status );
release_object( token );
}
}
/* retrieves the SID of the user that the token represents */
DECL_HANDLER(get_token_sid)
{
struct token *token;
reply->sid_len = 0;
if ((token = (struct token *)get_handle_obj( current->process, req->handle,
TOKEN_QUERY,
&token_ops )))
{
const SID *sid = NULL;
switch (req->which_sid)
{
case TokenUser:
assert(token->user);
sid = token->user;
break;
case TokenPrimaryGroup:
sid = token->primary_group;
break;
case TokenOwner:
{
struct group *group;
LIST_FOR_EACH_ENTRY( group, &token->groups, struct group, entry )
{
if (group->owner)
{
sid = &group->sid;
break;
}
}
break;
}
default:
set_error( STATUS_INVALID_PARAMETER );
break;
}
if (sid)
{
reply->sid_len = FIELD_OFFSET(SID, SubAuthority[sid->SubAuthorityCount]);
if (reply->sid_len <= get_reply_max_size()) set_reply_data( sid, reply->sid_len );
else set_error( STATUS_BUFFER_TOO_SMALL );
}
release_object( token );
}
}
/* retrieves the groups that the user represented by the token belongs to */
DECL_HANDLER(get_token_groups)
{
struct token *token;
reply->user_len = 0;
if ((token = (struct token *)get_handle_obj( current->process, req->handle,
TOKEN_QUERY,
&token_ops )))
{
size_t size_needed = sizeof(struct token_groups);
size_t sid_size = 0;
unsigned int group_count = 0;
const struct group *group;
LIST_FOR_EACH_ENTRY( group, &token->groups, const struct group, entry )
{
group_count++;
sid_size += FIELD_OFFSET(SID, SubAuthority[group->sid.SubAuthorityCount]);
}
size_needed += sid_size;
/* attributes size */
size_needed += sizeof(unsigned int) * group_count;
/* reply buffer contains size_needed bytes formatted as:
unsigned int count;
unsigned int attrib[count];
char sid_data[];
user_len includes extra data needed for TOKEN_GROUPS representation,
required caller buffer size calculated here to avoid extra server call */
reply->user_len = FIELD_OFFSET( TOKEN_GROUPS, Groups[group_count] ) + sid_size;
if (reply->user_len <= get_reply_max_size())
{
struct token_groups *tg = set_reply_data_size( size_needed );
if (tg)
{
unsigned int *attr_ptr = (unsigned int *)(tg + 1);
SID *sid_ptr = (SID *)(attr_ptr + group_count);
tg->count = group_count;
LIST_FOR_EACH_ENTRY( group, &token->groups, const struct group, entry )
{
*attr_ptr = 0;
if (group->mandatory) *attr_ptr |= SE_GROUP_MANDATORY;
if (group->def) *attr_ptr |= SE_GROUP_ENABLED_BY_DEFAULT;
if (group->enabled) *attr_ptr |= SE_GROUP_ENABLED;
if (group->owner) *attr_ptr |= SE_GROUP_OWNER;
if (group->deny_only) *attr_ptr |= SE_GROUP_USE_FOR_DENY_ONLY;
if (group->resource) *attr_ptr |= SE_GROUP_RESOURCE;
if (group->logon) *attr_ptr |= SE_GROUP_LOGON_ID;
memcpy(sid_ptr, &group->sid, FIELD_OFFSET(SID, SubAuthority[group->sid.SubAuthorityCount]));
sid_ptr = (SID *)((char *)sid_ptr + FIELD_OFFSET(SID, SubAuthority[group->sid.SubAuthorityCount]));
attr_ptr++;
}
}
}
else set_error( STATUS_BUFFER_TOO_SMALL );
release_object( token );
}
}
DECL_HANDLER(get_token_impersonation_level)
{
struct token *token;
if ((token = (struct token *)get_handle_obj( current->process, req->handle,
TOKEN_QUERY,
&token_ops )))
{
if (token->primary)
set_error( STATUS_INVALID_PARAMETER );
else
reply->impersonation_level = token->impersonation_level;
release_object( token );
}
}
DECL_HANDLER(get_token_statistics)
{
struct token *token;
if ((token = (struct token *)get_handle_obj( current->process, req->handle,
TOKEN_QUERY,
&token_ops )))
{
reply->token_id = token->token_id;
reply->modified_id = token->modified_id;
reply->primary = token->primary;
reply->impersonation_level = token->impersonation_level;
reply->group_count = list_count( &token->groups );
reply->privilege_count = list_count( &token->privileges );
release_object( token );
}
}
DECL_HANDLER(get_token_default_dacl)
{
struct token *token;
reply->acl_len = 0;
if ((token = (struct token *)get_handle_obj( current->process, req->handle,
TOKEN_QUERY,
&token_ops )))
{
if (token->default_dacl)
reply->acl_len = token->default_dacl->AclSize;
if (reply->acl_len <= get_reply_max_size())
{
ACL *acl_reply = set_reply_data_size( reply->acl_len );
if (acl_reply)
memcpy( acl_reply, token->default_dacl, reply->acl_len );
}
else set_error( STATUS_BUFFER_TOO_SMALL );
release_object( token );
}
}
DECL_HANDLER(set_token_default_dacl)
{
struct token *token;
if ((token = (struct token *)get_handle_obj( current->process, req->handle,
TOKEN_ADJUST_DEFAULT,
&token_ops )))
{
const ACL *acl = get_req_data();
unsigned int acl_size = get_req_data_size();
free( token->default_dacl );
token->default_dacl = NULL;
if (acl_size)
token->default_dacl = memdup( acl, acl_size );
release_object( token );
}
}
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