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wine/server/token.c
Jinoh Kang 9090229e67 server: Use the token owner instead of the token user for default object owner. 
Also, replace the token user with the token owner for the default DACL
as well.  Wine currently selects domain_users_sid as the token owner, so
use that.  This is required to pass the advapi32:security test which
expects the security descriptor owner SID to be referenced in the DACL
as well.
2022-07-20 22:33:44 +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 <sys/types.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"
#define MAX_SUBAUTH_COUNT 1
const struct luid SeIncreaseQuotaPrivilege = { 5, 0 };
const struct luid SeTcbPrivilege = { 7, 0 };
const struct luid SeSecurityPrivilege = { 8, 0 };
const struct luid SeTakeOwnershipPrivilege = { 9, 0 };
const struct luid SeLoadDriverPrivilege = { 10, 0 };
const struct luid SeSystemProfilePrivilege = { 11, 0 };
const struct luid SeSystemtimePrivilege = { 12, 0 };
const struct luid SeProfileSingleProcessPrivilege = { 13, 0 };
const struct luid SeIncreaseBasePriorityPrivilege = { 14, 0 };
const struct luid SeCreatePagefilePrivilege = { 15, 0 };
const struct luid SeBackupPrivilege = { 17, 0 };
const struct luid SeRestorePrivilege = { 18, 0 };
const struct luid SeShutdownPrivilege = { 19, 0 };
const struct luid SeDebugPrivilege = { 20, 0 };
const struct luid SeSystemEnvironmentPrivilege = { 22, 0 };
const struct luid SeChangeNotifyPrivilege = { 23, 0 };
const struct luid SeRemoteShutdownPrivilege = { 24, 0 };
const struct luid SeUndockPrivilege = { 25, 0 };
const struct luid SeManageVolumePrivilege = { 28, 0 };
const struct luid SeImpersonatePrivilege = { 29, 0 };
const struct luid SeCreateGlobalPrivilege = { 30, 0 };
struct sid_attrs
{
const struct sid *sid;
unsigned int attrs;
};
const struct sid world_sid = { SID_REVISION, 1, SECURITY_WORLD_SID_AUTHORITY, { SECURITY_WORLD_RID } };
const struct sid local_system_sid = { SID_REVISION, 1, SECURITY_NT_AUTHORITY, { SECURITY_LOCAL_SYSTEM_RID } };
const struct sid high_label_sid = { SID_REVISION, 1, SECURITY_MANDATORY_LABEL_AUTHORITY, { SECURITY_MANDATORY_HIGH_RID } };
const struct sid local_user_sid = { SID_REVISION, 5, SECURITY_NT_AUTHORITY, { SECURITY_NT_NON_UNIQUE, 0, 0, 0, 1000 } };
const struct sid builtin_admins_sid = { SID_REVISION, 2, SECURITY_NT_AUTHORITY, { SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS } };
const struct sid builtin_users_sid = { SID_REVISION, 2, SECURITY_NT_AUTHORITY, { SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_USERS } };
const struct sid domain_users_sid = { SID_REVISION, 5, SECURITY_NT_AUTHORITY, { SECURITY_NT_NON_UNIQUE, 0, 0, 0, DOMAIN_GROUP_RID_USERS } };
static const struct sid local_sid = { SID_REVISION, 1, SECURITY_LOCAL_SID_AUTHORITY, { SECURITY_LOCAL_RID } };
static const struct sid interactive_sid = { SID_REVISION, 1, SECURITY_NT_AUTHORITY, { SECURITY_INTERACTIVE_RID } };
static const struct sid anonymous_logon_sid = { SID_REVISION, 1, SECURITY_NT_AUTHORITY, { SECURITY_ANONYMOUS_LOGON_RID } };
static const struct sid authenticated_user_sid = { SID_REVISION, 1, SECURITY_NT_AUTHORITY, { SECURITY_AUTHENTICATED_USER_RID } };
static struct luid prev_luid_value = { 1000, 0 };
static const WCHAR token_name[] = {'T','o','k','e','n'};
struct type_descr token_type =
{
{ token_name, sizeof(token_name) }, /* name */
TOKEN_ALL_ACCESS | SYNCHRONIZE, /* valid_access */
{ /* mapping */
STANDARD_RIGHTS_READ | TOKEN_QUERY_SOURCE | TOKEN_QUERY | TOKEN_DUPLICATE,
STANDARD_RIGHTS_WRITE | TOKEN_ADJUST_SESSIONID | TOKEN_ADJUST_DEFAULT | TOKEN_ADJUST_GROUPS
| TOKEN_ADJUST_PRIVILEGES,
STANDARD_RIGHTS_EXECUTE | TOKEN_IMPERSONATE | TOKEN_ASSIGN_PRIMARY,
TOKEN_ALL_ACCESS
},
};
struct token
{
struct object obj; /* object header */
struct luid token_id; /* system-unique id of token */
struct luid 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) */
struct sid *user; /* SID of user this token represents */
struct sid *owner; /* SID of owner (points to user or one of groups) */
struct sid *primary_group; /* SID of user's primary group (points to one of groups) */
unsigned int primary; /* is this a primary or impersonation token? */
unsigned int session_id; /* token session id */
struct acl *default_dacl; /* the default DACL to assign to objects created by this user */
int impersonation_level; /* impersonation level this token is capable of if non-primary token */
int elevation; /* elevation type */
};
struct privilege
{
struct list entry;
struct 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 int attrs;
struct sid sid;
};
static void token_dump( struct object *obj, int verbose );
static void token_destroy( struct object *obj );
static const struct object_ops token_ops =
{
sizeof(struct token), /* size */
&token_type, /* type */
token_dump, /* dump */
no_add_queue, /* add_queue */
NULL, /* remove_queue */
NULL, /* signaled */
NULL, /* satisfied */
no_signal, /* signal */
no_get_fd, /* get_fd */
default_map_access, /* map_access */
default_get_sd, /* get_sd */
default_set_sd, /* set_sd */
no_get_full_name, /* get_full_name */
no_lookup_name, /* lookup_name */
no_link_name, /* link_name */
NULL, /* unlink_name */
no_open_file, /* open_file */
no_kernel_obj_list, /* get_kernel_obj_list */
no_close_handle, /* close_handle */
token_destroy /* destroy */
};
static void token_dump( struct object *obj, int verbose )
{
struct token *token = (struct token *)obj;
assert( obj->ops == &token_ops );
fprintf( stderr, "Token id=%d.%u primary=%u impersonation level=%d\n", token->token_id.high_part,
token->token_id.low_part, token->primary, token->impersonation_level );
}
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 struct 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 &local_user_sid;
else
return &anonymous_logon_sid;
}
static int acl_is_valid( const struct acl *acl, data_size_t size )
{
ULONG i;
const struct ace *ace;
if (size < sizeof(*acl)) return FALSE;
size = min(size, MAX_ACL_LEN);
size -= sizeof(*acl);
for (i = 0, ace = ace_first( acl ); i < acl->count; i++, ace = ace_next( ace ))
{
if (size < sizeof(*ace) || size < ace->size) return FALSE;
size -= ace->size;
switch (ace->type)
{
case ACCESS_DENIED_ACE_TYPE:
case ACCESS_ALLOWED_ACE_TYPE:
case SYSTEM_AUDIT_ACE_TYPE:
case SYSTEM_ALARM_ACE_TYPE:
case SYSTEM_MANDATORY_LABEL_ACE_TYPE:
break;
default:
return FALSE;
}
if (!sid_valid_size( (const struct sid *)(ace + 1), ace->size - sizeof(*ace) )) return FALSE;
}
return TRUE;
}
static unsigned int get_sid_count( const struct sid *sid, data_size_t size )
{
unsigned int count;
for (count = 0; sid_valid_size( sid, size ); count++)
{
size -= sid_len( sid );
sid = (const struct sid *)((char *)sid + sid_len( sid ));
}
return count;
}
/* 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 struct sid *group;
const struct sid *owner;
const struct acl *sacl;
const struct acl *dacl;
int dummy;
if (size < offset)
return FALSE;
if (sd->owner_len >= offsetof(struct sid, sub_auth[255]) || offset + sd->owner_len > size) return FALSE;
owner = sd_get_owner( sd );
offset += sd->owner_len;
if (owner && !sid_valid_size( owner, sd->owner_len )) return FALSE;
if (sd->group_len >= offsetof(struct sid, sub_auth[255]) || offset + sd->group_len > size) return FALSE;
group = sd_get_group( sd );
offset += sd->group_len;
if (group && !sid_valid_size( group, sd->group_len )) return FALSE;
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;
}
/* extract security labels from SACL */
struct acl *extract_security_labels( const struct acl *sacl )
{
size_t size = sizeof(*sacl);
const struct ace *ace;
struct ace *label_ace;
unsigned int i, count = 0;
struct acl *label_acl;
for (i = 0, ace = ace_first( sacl ); i < sacl->count; i++, ace = ace_next( ace ))
{
if (ace->type == SYSTEM_MANDATORY_LABEL_ACE_TYPE)
{
size += ace->size;
count++;
}
}
label_acl = mem_alloc( size );
if (!label_acl) return NULL;
label_acl->revision = sacl->revision;
label_acl->pad1 = 0;
label_acl->size = size;
label_acl->count = count;
label_acl->pad2 = 0;
label_ace = ace_first( label_acl );
for (i = 0, ace = ace_first( sacl ); i < sacl->count; i++, ace = ace_next( ace ))
{
if (ace->type == SYSTEM_MANDATORY_LABEL_ACE_TYPE)
{
memcpy( label_ace, ace, ace->size );
label_ace = ace_next( label_ace );
}
}
return label_acl;
}
/* replace security labels in an existing SACL */
struct acl *replace_security_labels( const struct acl *old_sacl, const struct acl *new_sacl )
{
const struct ace *ace;
struct ace *replaced_ace;
unsigned int i, count = 0;
unsigned char revision = ACL_REVISION;
struct acl *replaced_acl;
data_size_t size = sizeof(*replaced_acl);
if (old_sacl)
{
revision = max( revision, old_sacl->revision );
for (i = 0, ace = ace_first( old_sacl ); i < old_sacl->count; i++, ace = ace_next( ace ))
{
if (ace->type == SYSTEM_MANDATORY_LABEL_ACE_TYPE) continue;
size += ace->size;
count++;
}
}
if (new_sacl)
{
revision = max( revision, new_sacl->revision );
for (i = 0, ace = ace_first( new_sacl ); i < new_sacl->count; i++, ace = ace_next( ace ))
{
if (ace->type != SYSTEM_MANDATORY_LABEL_ACE_TYPE) continue;
size += ace->size;
count++;
}
}
if (size > MAX_ACL_LEN)
{
set_error( STATUS_INVALID_ACL );
return NULL;
}
replaced_acl = mem_alloc( size );
if (!replaced_acl) return NULL;
replaced_acl->revision = revision;
replaced_acl->pad1 = 0;
replaced_acl->size = size;
replaced_acl->count = count;
replaced_acl->pad2 = 0;
replaced_ace = (struct ace *)(replaced_acl + 1);
if (old_sacl)
{
for (i = 0, ace = ace_first( old_sacl ); i < old_sacl->count; i++, ace = ace_next( ace ))
{
if (ace->type == SYSTEM_MANDATORY_LABEL_ACE_TYPE) continue;
memcpy( replaced_ace, ace, ace->size );
replaced_ace = ace_next( replaced_ace );
}
}
if (new_sacl)
{
for (i = 0, ace = ace_first( new_sacl ); i < new_sacl->count; i++, ace = ace_next( ace ))
{
if (ace->type != SYSTEM_MANDATORY_LABEL_ACE_TYPE) continue;
memcpy( replaced_ace, ace, ace->size );
replaced_ace = ace_next( replaced_ace );
}
}
return replaced_acl;
}
static inline int is_equal_luid( struct luid luid1, struct luid luid2 )
{
return (luid1.low_part == luid2.low_part && luid1.high_part == luid2.high_part);
}
static inline void allocate_luid( struct luid *luid )
{
prev_luid_value.low_part++;
*luid = prev_luid_value;
}
DECL_HANDLER( allocate_locally_unique_id )
{
allocate_luid( &reply->luid );
}
static inline struct luid_attr luid_and_attr_from_privilege( const struct privilege *in )
{
struct luid_attr ret = { in->luid };
ret.attrs = (in->enabled ? SE_PRIVILEGE_ENABLED : 0) |
(in->def ? SE_PRIVILEGE_ENABLED_BY_DEFAULT : 0);
return ret;
}
static struct privilege *privilege_add( struct token *token, struct 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 int primary, unsigned int session_id, const struct sid *user,
const struct sid_attrs *groups, unsigned int group_count,
const struct luid_attr *privs, unsigned int priv_count,
const struct acl *default_dacl, const struct luid *modified_id,
int impersonation_level, int elevation )
{
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;
token->session_id = session_id;
/* 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;
token->elevation = elevation;
/* copy user */
token->user = memdup( user, sid_len( user ));
if (!token->user)
{
release_object( token );
return NULL;
}
/* copy groups */
for (i = 0; i < group_count; i++)
{
size_t size = offsetof( struct group, sid.sub_auth[groups[i].sid->sub_count] );
struct group *group = mem_alloc( size );
if (!group)
{
release_object( token );
return NULL;
}
group->attrs = groups[i].attrs;
copy_sid( &group->sid, groups[i].sid );
list_add_tail( &token->groups, &group->entry );
/* Use first owner capable group as owner and primary group */
if (!token->primary_group && (group->attrs & SE_GROUP_OWNER))
{
token->owner = &group->sid;
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].attrs & SE_PRIVILEGE_ENABLED ))
{
release_object( token );
return NULL;
}
}
if (default_dacl)
{
token->default_dacl = memdup( default_dacl, default_dacl->size );
if (!token->default_dacl)
{
release_object( token );
return NULL;
}
}
}
return token;
}
static int filter_group( struct group *group, const struct sid *filter, unsigned int count )
{
unsigned int i;
for (i = 0; i < count; i++)
{
if (equal_sid( &group->sid, filter )) return 1;
filter = (const struct sid *)((char *)filter + sid_len( filter ));
}
return 0;
}
static int filter_privilege( struct privilege *privilege, const struct luid_attr *filter, unsigned int count )
{
unsigned int i;
for (i = 0; i < count; i++)
if (is_equal_luid( privilege->luid, filter[i].luid )) return 1;
return 0;
}
struct token *token_duplicate( struct token *src_token, unsigned primary,
int impersonation_level, const struct security_descriptor *sd,
const struct luid_attr *remove_privs, unsigned int remove_priv_count,
const struct sid *remove_groups, unsigned int remove_group_count)
{
const struct luid *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->session_id, src_token->user, NULL, 0,
NULL, 0, src_token->default_dacl, modified_id,
impersonation_level, src_token->elevation );
if (!token) return token;
/* copy groups */
token->primary_group = NULL;
LIST_FOR_EACH_ENTRY( group, &src_token->groups, struct group, entry )
{
size_t size = offsetof( struct group, sid.sub_auth[group->sid.sub_count] );
struct group *newgroup = mem_alloc( size );
if (!newgroup)
{
release_object( token );
return NULL;
}
memcpy( newgroup, group, size );
if (filter_group( group, remove_groups, remove_group_count ))
{
newgroup->attrs &= ~(SE_GROUP_ENABLED | SE_GROUP_ENABLED_BY_DEFAULT);
newgroup->attrs |= SE_GROUP_USE_FOR_DENY_ONLY;
}
list_add_tail( &token->groups, &newgroup->entry );
if (src_token->primary_group == &group->sid)
{
token->owner = &newgroup->sid;
token->primary_group = &newgroup->sid;
}
}
assert( token->primary_group );
/* copy privileges */
LIST_FOR_EACH_ENTRY( privilege, &src_token->privileges, struct privilege, entry )
{
if (filter_privilege( privilege, remove_privs, remove_priv_count )) continue;
if (!privilege_add( token, privilege->luid, privilege->enabled ))
{
release_object( token );
return NULL;
}
}
if (sd) default_set_sd( &token->obj, sd, OWNER_SECURITY_INFORMATION | GROUP_SECURITY_INFORMATION |
DACL_SECURITY_INFORMATION | SACL_SECURITY_INFORMATION );
return token;
}
static struct acl *create_default_dacl( const struct sid *user )
{
struct ace *ace;
struct acl *default_dacl;
size_t default_dacl_size = sizeof(*default_dacl) + 2 * sizeof(*ace) +
sid_len( &local_system_sid ) + sid_len( user );
default_dacl = mem_alloc( default_dacl_size );
if (!default_dacl) return NULL;
default_dacl->revision = ACL_REVISION;
default_dacl->pad1 = 0;
default_dacl->size = default_dacl_size;
default_dacl->count = 2;
default_dacl->pad2 = 0;
/* GENERIC_ALL for Local System */
ace = set_ace( ace_first( default_dacl ), &local_system_sid, ACCESS_ALLOWED_ACE_TYPE, 0, GENERIC_ALL );
/* GENERIC_ALL for specified user */
set_ace( ace_next( ace ), user, ACCESS_ALLOWED_ACE_TYPE, 0, GENERIC_ALL );
return default_dacl;
}
struct sid_data
{
SID_IDENTIFIER_AUTHORITY idauth;
int count;
unsigned int subauth[MAX_SUBAUTH_COUNT];
};
static struct security_descriptor *create_security_label_sd( struct token *token, const struct sid *label_sid )
{
size_t sid_size = sid_len( label_sid ), sacl_size, sd_size;
struct security_descriptor *sd;
struct acl *sacl;
sacl_size = sizeof(*sacl) + sizeof(struct ace) + sid_size;
sd_size = sizeof(struct security_descriptor) + sacl_size;
if (!(sd = mem_alloc( sd_size )))
return NULL;
sd->control = SE_SACL_PRESENT;
sd->owner_len = 0;
sd->group_len = 0;
sd->sacl_len = sacl_size;
sd->dacl_len = 0;
sacl = (struct acl *)(sd + 1);
sacl->revision = ACL_REVISION;
sacl->pad1 = 0;
sacl->size = sacl_size;
sacl->count = 1;
sacl->pad2 = 0;
set_ace( ace_first( sacl ), label_sid, SYSTEM_MANDATORY_LABEL_ACE_TYPE, 0,
SYSTEM_MANDATORY_LABEL_NO_WRITE_UP );
assert( sd_is_valid( sd, sd_size ) );
return sd;
}
int token_assign_label( struct token *token, const struct sid *label )
{
struct security_descriptor *sd;
int ret = 0;
if ((sd = create_security_label_sd( token, label )))
{
ret = set_sd_defaults_from_token( &token->obj, sd, LABEL_SECURITY_INFORMATION, token );
free( sd );
}
return ret;
}
struct token *get_token_obj( struct process *process, obj_handle_t handle, unsigned int access )
{
return (struct token *)get_handle_obj( process, handle, access, &token_ops );
}
struct token *token_create_admin( unsigned primary, int impersonation_level, int elevation, unsigned int session_id )
{
struct token *token = NULL;
struct sid alias_admins_sid = { SID_REVISION, 2, SECURITY_NT_AUTHORITY, { SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS }};
struct sid alias_users_sid = { SID_REVISION, 2, SECURITY_NT_AUTHORITY, { SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_USERS }};
/* on Windows, this value changes every time the user logs on */
struct sid logon_sid = { SID_REVISION, 3, SECURITY_NT_AUTHORITY, { SECURITY_LOGON_IDS_RID, 0, 0 /* FIXME: should be randomly generated when tokens are inherited by new processes */ }};
const struct sid *user_sid = security_unix_uid_to_sid( getuid() );
struct acl *default_dacl = create_default_dacl( &domain_users_sid );
const struct luid_attr admin_privs[] =
{
{ SeChangeNotifyPrivilege, SE_PRIVILEGE_ENABLED },
{ SeTcbPrivilege, 0 },
{ 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 struct sid_attrs admin_groups[] =
{
{ &world_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
{ &local_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
{ &interactive_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
{ &authenticated_user_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
{ &domain_users_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY|SE_GROUP_OWNER },
{ &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 },
};
token = create_token( primary, session_id, user_sid, admin_groups, ARRAY_SIZE( admin_groups ),
admin_privs, ARRAY_SIZE( admin_privs ), default_dacl,
NULL, impersonation_level, elevation );
/* we really need a primary group */
assert( token->primary_group );
free( default_dacl );
return token;
}
static struct privilege *token_find_privilege( struct token *token, struct 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 struct luid_attr *privs,
unsigned int count, struct luid_attr *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].attrs & SE_PRIVILEGE_REMOVED) privilege_remove( privilege );
else
{
/* save previous state for caller */
if (mod_privs_count)
{
*mod_privs++ = luid_and_attr_from_privilege( privilege );
mod_privs_count--;
modified_count++;
}
privilege->enabled = !!(privs[i].attrs & SE_PRIVILEGE_ENABLED);
}
}
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 struct luid_attr *reqprivs,
unsigned int count, struct luid_attr *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].attrs |= 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 struct sid *sid, int deny )
{
struct group *group;
if (equal_sid( token->user, sid )) return TRUE;
LIST_FOR_EACH_ENTRY( group, &token->groups, struct group, entry )
{
if (!(group->attrs & SE_GROUP_ENABLED)) continue;
if (!deny && (group->attrs & SE_GROUP_USE_FOR_DENY_ONLY)) continue;
if (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,
struct luid_attr *privs,
unsigned int *priv_count,
const generic_map_t *mapping,
unsigned int *granted_access,
unsigned int *status )
{
unsigned int current_access = 0;
unsigned int denied_access = 0;
ULONG i;
const struct acl *dacl;
int dacl_present;
const struct ace *ace;
const struct 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))
{
if (priv_count) *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 ))
{
if (priv_count) *priv_count = 0;
return STATUS_INVALID_SECURITY_DESCR;
}
/* 1: Grant desired access if the object is unprotected */
if (!dacl_present || !dacl)
{
if (priv_count) *priv_count = 0;
if (desired_access & MAXIMUM_ALLOWED)
*granted_access = mapping->all;
else
*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 struct luid_attr security_priv = { SeSecurityPrivilege, 0 };
struct luid_attr 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
{
if (priv_count) *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 |= (STANDARD_RIGHTS_REQUIRED | SYNCHRONIZE);
if (desired_access == current_access)
{
*granted_access = current_access;
return *status = STATUS_SUCCESS;
}
}
/* 4: Grant rights according to the DACL */
for (i = 0, ace = ace_first( dacl ); i < dacl->count; i++, ace = ace_next( ace ))
{
const struct sid *sid = (const struct sid *)(ace + 1);
if (ace->flags & INHERIT_ONLY_ACE) continue;
switch (ace->type)
{
case ACCESS_DENIED_ACE_TYPE:
if (token_sid_present( token, sid, TRUE ))
{
unsigned int access = map_access( ace->mask, 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:
if (token_sid_present( token, sid, FALSE ))
{
unsigned int access = map_access( ace->mask, 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 struct acl *token_get_default_dacl( struct token *token )
{
return token->default_dacl;
}
const struct sid *token_get_owner( struct token *token )
{
return token->owner;
}
const struct sid *token_get_primary_group( struct token *token )
{
return token->primary_group;
}
unsigned int token_get_session_id( struct token *token )
{
return token->session_id;
}
int check_object_access(struct token *token, struct object *obj, unsigned int *access)
{
generic_map_t mapping;
unsigned int status;
int res;
if (!token)
token = current->token ? current->token : current->process->token;
mapping.all = obj->ops->map_access( obj, GENERIC_ALL );
if (!obj->sd)
{
if (*access & MAXIMUM_ALLOWED) *access = mapping.all;
return TRUE;
}
mapping.read = obj->ops->map_access( obj, GENERIC_READ );
mapping.write = obj->ops->map_access( obj, GENERIC_WRITE );
mapping.exec = obj->ops->map_access( obj, GENERIC_EXECUTE );
res = token_access_check( token, obj->sd, *access, NULL, NULL,
&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 struct luid_attr *privs = get_req_data();
struct luid_attr *modified_privs = NULL;
unsigned int priv_count = get_req_data_size() / sizeof(*privs);
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
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;
struct luid_attr *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)
LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
*privs++ = luid_and_attr_from_privilege( privilege );
}
else
set_error(STATUS_BUFFER_TOO_SMALL);
release_object( token );
}
}
/* creates a duplicate of the token */
DECL_HANDLER(duplicate_token)
{
struct token *src_token;
struct unicode_str name;
const struct security_descriptor *sd;
const struct object_attributes *objattr = get_req_object_attributes( &sd, &name, NULL );
if (!objattr) return;
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, sd, NULL, 0, NULL, 0 );
if (token)
{
unsigned int access = req->access ? req->access : get_handle_access( current->process, req->handle );
reply->new_handle = alloc_handle_no_access_check( current->process, token, access, objattr->attributes );
release_object( token );
}
release_object( src_token );
}
}
/* creates a restricted version of a token */
DECL_HANDLER(filter_token)
{
struct token *src_token;
if ((src_token = (struct token *)get_handle_obj( current->process, req->handle, TOKEN_DUPLICATE, &token_ops )))
{
const struct luid_attr *filter_privileges = get_req_data();
unsigned int priv_count, group_count;
const struct sid *filter_groups;
struct token *token;
priv_count = min( req->privileges_size, get_req_data_size() ) / sizeof(struct luid_attr);
filter_groups = (const struct sid *)((char *)filter_privileges + priv_count * sizeof(struct luid_attr));
group_count = get_sid_count( filter_groups, get_req_data_size() - priv_count * sizeof(struct luid_attr) );
token = token_duplicate( src_token, src_token->primary, src_token->impersonation_level, NULL,
filter_privileges, priv_count, filter_groups, group_count );
if (token)
{
unsigned int access = get_handle_access( current->process, req->handle );
reply->new_handle = alloc_handle_no_access_check( current->process, token, access, 0 );
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(struct luid_attr);
if (!token->primary && token->impersonation_level <= SecurityAnonymous)
set_error( STATUS_BAD_IMPERSONATION_LEVEL );
else if (get_reply_max_size() >= count * sizeof(struct luid_attr))
{
struct luid_attr *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 )))
{
unsigned int status;
struct luid_attr 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;
}
status = token_access_check( token, sd, req->desired_access, &priv, &priv_count, &req->mapping,
&reply->access_granted, &reply->access_status );
reply->privileges_len = priv_count*sizeof(struct luid_attr);
if ((priv_count > 0) && (reply->privileges_len <= get_reply_max_size()))
{
struct luid_attr *privs = set_reply_data_size( priv_count * sizeof(*privs) );
memcpy( privs, &priv, sizeof(priv) );
}
set_error( status );
release_object( token );
}
}
/* retrieves an SID from the token */
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 struct 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:
sid = token->owner;
break;
default:
set_error( STATUS_INVALID_PARAMETER );
break;
}
if (sid)
{
reply->sid_len = sid_len( sid );
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;
if ((token = (struct token *)get_handle_obj( current->process, req->handle, TOKEN_QUERY, &token_ops )))
{
unsigned int group_count = 0;
const struct group *group;
LIST_FOR_EACH_ENTRY( group, &token->groups, const struct group, entry )
{
if (req->attr_mask && !(group->attrs & req->attr_mask)) continue;
group_count++;
reply->sid_len += sid_len( &group->sid );
}
reply->attr_len = sizeof(unsigned int) * group_count;
if (reply->attr_len + reply->sid_len <= get_reply_max_size())
{
unsigned int *attr_ptr = set_reply_data_size( reply->attr_len + reply->sid_len );
struct sid *sid = (struct sid *)(attr_ptr + group_count);
if (attr_ptr)
{
LIST_FOR_EACH_ENTRY( group, &token->groups, const struct group, entry )
{
if (req->attr_mask && !(group->attrs & req->attr_mask)) continue;
sid = copy_sid( sid, &group->sid );
*attr_ptr++ = group->attrs;
}
}
}
else set_error( STATUS_BUFFER_TOO_SMALL );
release_object( token );
}
}
DECL_HANDLER(get_token_info)
{
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->session_id = token->session_id;
reply->primary = token->primary;
reply->impersonation_level = token->impersonation_level;
reply->elevation = token->elevation;
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->size;
if (reply->acl_len <= get_reply_max_size())
{
struct 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;
const struct acl *acl = get_req_data();
unsigned int acl_size = get_req_data_size();
if (acl_size && !acl_is_valid( acl, acl_size ))
{
set_error( STATUS_INVALID_ACL );
return;
}
if ((token = (struct token *)get_handle_obj( current->process, req->handle,
TOKEN_ADJUST_DEFAULT,
&token_ops )))
{
free( token->default_dacl );
token->default_dacl = NULL;
if (acl_size)
token->default_dacl = memdup( acl, acl_size );
release_object( token );
}
}
DECL_HANDLER(create_linked_token)
{
struct token *token, *linked;
int elevation;
if ((token = (struct token *)get_handle_obj( current->process, req->handle,
TOKEN_QUERY, &token_ops )))
{
switch (token->elevation)
{
case TokenElevationTypeFull:
elevation = TokenElevationTypeLimited;
break;
case TokenElevationTypeLimited:
elevation = TokenElevationTypeFull;
break;
default:
release_object( token );
return;
}
if ((linked = token_create_admin( FALSE, SecurityIdentification, elevation, token->session_id )))
{
reply->linked = alloc_handle( current->process, linked, TOKEN_ALL_ACCESS, 0 );
release_object( linked );
}
release_object( token );
}
}
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