974 lines
33 KiB
C
974 lines
33 KiB
C
/*
|
|
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <assert.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "windef.h"
|
|
|
|
#include "handle.h"
|
|
#include "thread.h"
|
|
#include "process.h"
|
|
#include "request.h"
|
|
#include "security.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 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 PSID security_world_sid = (PSID)&world_sid;
|
|
static PSID security_local_sid = (PSID)&local_sid;
|
|
static PSID security_interactive_sid = (PSID)&interactive_sid;
|
|
static PSID security_authenticated_user_sid = (PSID)&authenticated_user_sid;
|
|
|
|
struct token
|
|
{
|
|
struct object obj; /* object header */
|
|
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 */
|
|
};
|
|
|
|
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 sid_and_attributes
|
|
{
|
|
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 void token_destroy( struct object *obj );
|
|
|
|
static const struct object_ops token_ops =
|
|
{
|
|
sizeof(struct token), /* size */
|
|
token_dump, /* dump */
|
|
no_add_queue, /* add_queue */
|
|
NULL, /* remove_queue */
|
|
NULL, /* signaled */
|
|
NULL, /* satisfied */
|
|
no_signal, /* signal */
|
|
no_get_fd, /* get_fd */
|
|
token_destroy /* destroy */
|
|
};
|
|
|
|
|
|
static void token_dump( struct object *obj, int verbose )
|
|
{
|
|
fprintf( stderr, "Security token\n" );
|
|
/* FIXME: dump token members */
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static inline int security_equal_sid( const SID *sid1, const SID *sid2 )
|
|
{
|
|
return ((sid1->SubAuthorityCount == sid2->SubAuthorityCount) &&
|
|
!memcmp( sid1, sid2, FIELD_OFFSET(SID, SubAuthority[sid1->SubAuthorityCount]) ));
|
|
}
|
|
|
|
static const ACE_HEADER *ace_next( const ACE_HEADER *ace )
|
|
{
|
|
return (const ACE_HEADER *)((const char *)ace + ace->AceSize);
|
|
}
|
|
|
|
static int acl_is_valid( const ACL *acl, 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;
|
|
|
|
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;
|
|
break;
|
|
case ACCESS_ALLOWED_ACE_TYPE:
|
|
sid = (const SID *)&((const ACCESS_ALLOWED_ACE *)ace)->SidStart;
|
|
break;
|
|
case SYSTEM_AUDIT_ACE_TYPE:
|
|
sid = (const SID *)&((const SYSTEM_AUDIT_ACE *)ace)->SidStart;
|
|
break;
|
|
case SYSTEM_ALARM_ACE_TYPE:
|
|
sid = (const SID *)&((const SYSTEM_ALARM_ACE *)ace)->SidStart;
|
|
break;
|
|
default:
|
|
return FALSE;
|
|
}
|
|
if (size < sizeof(SID) ||
|
|
size < FIELD_OFFSET(SID, SubAuthority[sid->SubAuthorityCount]))
|
|
return FALSE;
|
|
ace = ace_next( ace );
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
/* gets the discretionary access control list from a security descriptor */
|
|
static inline const ACL *sd_get_dacl( const struct security_descriptor *sd, int *present )
|
|
{
|
|
*present = (sd->control & SE_DACL_PRESENT ? TRUE : FALSE);
|
|
|
|
if (sd->dacl_len)
|
|
return (const ACL *)((const char *)(sd + 1) +
|
|
sd->owner_len + sd->group_len + sd->sacl_len);
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
/* gets the system access control list from a security descriptor */
|
|
static inline const ACL *sd_get_sacl( const struct security_descriptor *sd, int *present )
|
|
{
|
|
*present = (sd->control & SE_SACL_PRESENT ? TRUE : FALSE);
|
|
|
|
if (sd->sacl_len)
|
|
return (const ACL *)((const char *)(sd + 1) +
|
|
sd->owner_len + sd->group_len);
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
/* gets the owner from a security descriptor */
|
|
static inline const SID *sd_get_owner( const struct security_descriptor *sd )
|
|
{
|
|
if (sd->owner_len)
|
|
return (const SID *)(sd + 1);
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
/* gets the primary group from a security descriptor */
|
|
static inline const SID *sd_get_group( const struct security_descriptor *sd )
|
|
{
|
|
if (sd->group_len)
|
|
return (const SID *)((const char *)(sd + 1) + sd->owner_len);
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
/* checks whether all members of a security descriptor fit inside the size
|
|
* of memory specified */
|
|
static int sd_is_valid( const struct security_descriptor *sd, 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->owner_len < sizeof(SID)) || (needed_size > sd->owner_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;
|
|
}
|
|
|
|
/* 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 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 sid_and_attributes *group = LIST_ENTRY( cursor, struct sid_and_attributes, entry );
|
|
list_remove( &group->entry );
|
|
free( group );
|
|
}
|
|
}
|
|
|
|
static struct token *create_token( const SID *user,
|
|
const SID_AND_ATTRIBUTES *groups, unsigned int group_count,
|
|
const LUID_AND_ATTRIBUTES *privs, unsigned int priv_count )
|
|
{
|
|
struct token *token = alloc_object( &token_ops );
|
|
if (token)
|
|
{
|
|
int i;
|
|
list_init( &token->privileges );
|
|
list_init( &token->groups );
|
|
/* 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 sid_and_attributes, sid.SubAuthority[((const SID *)groups[i].Sid)->SubAuthorityCount] );
|
|
struct sid_and_attributes *group = mem_alloc( size );
|
|
memcpy( &group->sid, groups[i].Sid, FIELD_OFFSET( SID, SubAuthority[((const SID *)groups[i].Sid)->SubAuthorityCount] ) );
|
|
group->enabled = TRUE;
|
|
group->def = TRUE;
|
|
group->logon = FALSE;
|
|
group->mandatory = (groups[i].Attributes & SE_GROUP_MANDATORY) ? TRUE : FALSE;
|
|
group->owner = FALSE;
|
|
group->resource = FALSE;
|
|
group->deny_only = FALSE;
|
|
list_add_tail( &token->groups, &group->entry );
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
}
|
|
}
|
|
return token;
|
|
}
|
|
|
|
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 };
|
|
PSID alias_admins_sid;
|
|
PSID alias_users_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 );
|
|
|
|
if (alias_admins_sid && alias_users_sid)
|
|
{
|
|
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 , 0 },
|
|
{ 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 },
|
|
{ alias_users_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
|
|
};
|
|
/* note: we just set the user sid to be the local system builtin sid -
|
|
* telling us what this should be is the job of a client-side program */
|
|
token = create_token( &local_system_sid,
|
|
admin_groups, sizeof(admin_groups)/sizeof(admin_groups[0]),
|
|
admin_privs, sizeof(admin_privs)/sizeof(admin_privs[0]) );
|
|
}
|
|
|
|
if (alias_admins_sid)
|
|
free( alias_admins_sid );
|
|
if (alias_users_sid)
|
|
free( alias_users_sid );
|
|
|
|
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)
|
|
{
|
|
int i;
|
|
unsigned int modified_count = 0;
|
|
|
|
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_REMOVE)
|
|
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;
|
|
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)
|
|
{
|
|
int i;
|
|
unsigned int 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);
|
|
}
|
|
|
|
static int token_sid_present( struct token *token, const SID *sid, int deny )
|
|
{
|
|
struct sid_and_attributes *group;
|
|
|
|
if (security_equal_sid( token->user, sid )) return TRUE;
|
|
|
|
LIST_FOR_EACH_ENTRY( group, &token->groups, struct sid_and_attributes, 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 access was granted to the object, or an error
|
|
* status code if not, giving the reason. errors not relating to giving access
|
|
* to the object are returned in the status parameter. granted_access and
|
|
* status always have a valid value stored in them on return. */
|
|
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 success, but no access rights */
|
|
*status = STATUS_SUCCESS;
|
|
*granted_access = 0;
|
|
|
|
/* fail if desired_access contains generic rights */
|
|
if (desired_access & (GENERIC_READ|GENERIC_WRITE|GENERIC_EXECUTE|GENERIC_ALL))
|
|
{
|
|
*priv_count = 0;
|
|
*status = STATUS_GENERIC_NOT_MAPPED;
|
|
return STATUS_ACCESS_DENIED;
|
|
}
|
|
|
|
dacl = sd_get_dacl( sd, &dacl_present );
|
|
owner = sd_get_owner( sd );
|
|
if (!owner || !sd_get_group( sd ))
|
|
{
|
|
*priv_count = 0;
|
|
*status = STATUS_INVALID_SECURITY_DESCR;
|
|
return STATUS_ACCESS_DENIED;
|
|
}
|
|
|
|
/* 1: Grant desired access if the object is unprotected */
|
|
if (!dacl_present)
|
|
{
|
|
*priv_count = 0;
|
|
*granted_access = desired_access;
|
|
return STATUS_SUCCESS;
|
|
}
|
|
if (!dacl)
|
|
{
|
|
*priv_count = 0;
|
|
return STATUS_ACCESS_DENIED;
|
|
}
|
|
|
|
/* 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_SUCCESS;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
*priv_count = 0;
|
|
return STATUS_PRIVILEGE_NOT_HELD;
|
|
}
|
|
}
|
|
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_SUCCESS;
|
|
}
|
|
}
|
|
|
|
/* 4: Grant rights according to the DACL */
|
|
ace = (const ACE_HEADER *)(dacl + 1);
|
|
for (i = 0; i < dacl->AceCount; i++)
|
|
{
|
|
const ACCESS_ALLOWED_ACE *aa_ace;
|
|
const ACCESS_DENIED_ACE *ad_ace;
|
|
const SID *sid;
|
|
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)
|
|
{
|
|
*granted_access = 0;
|
|
return STATUS_SUCCESS;
|
|
}
|
|
}
|
|
}
|
|
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;
|
|
|
|
ace = ace_next( ace );
|
|
}
|
|
|
|
if (desired_access & MAXIMUM_ALLOWED)
|
|
{
|
|
*granted_access = current_access & ~denied_access;
|
|
if (*granted_access)
|
|
return STATUS_SUCCESS;
|
|
else
|
|
return STATUS_ACCESS_DENIED;
|
|
}
|
|
else
|
|
{
|
|
if ((current_access & desired_access) == desired_access)
|
|
{
|
|
*granted_access = current_access & desired_access;
|
|
return STATUS_SUCCESS;
|
|
}
|
|
else
|
|
return STATUS_ACCESS_DENIED;
|
|
}
|
|
}
|
|
|
|
/* 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)
|
|
reply->token = alloc_handle( current->process, thread->token, TOKEN_ALL_ACCESS, 0);
|
|
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, TOKEN_ALL_ACCESS, 0);
|
|
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)
|
|
{
|
|
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 )))
|
|
{
|
|
/* FIXME: use req->primary and req->impersonation_level */
|
|
struct token *token = create_token( src_token->user, NULL, 0, NULL, 0 );
|
|
if (token)
|
|
{
|
|
struct privilege *privilege;
|
|
unsigned int access;
|
|
|
|
/* FIXME: copy groups */
|
|
|
|
LIST_FOR_EACH_ENTRY( privilege, &src_token->privileges, struct privilege, entry )
|
|
privilege_add( token, &privilege->luid, privilege->enabled );
|
|
|
|
access = req->access;
|
|
if (access & MAXIMUM_ALLOWED) access = TOKEN_ALL_ACCESS; /* FIXME: needs general solution */
|
|
reply->new_handle = alloc_handle( current->process, token, access, req->inherit);
|
|
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 (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)
|
|
{
|
|
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));
|
|
|
|
/* FIXME: check token is an impersonation token, if not return
|
|
* STATUS_NO_IMPERSONATION_TOKEN */
|
|
|
|
mapping.GenericRead = req->mapping_read;
|
|
mapping.GenericWrite = req->mapping_write;
|
|
mapping.GenericExecute = req->mapping_execute;
|
|
mapping.GenericAll = req->mapping_all;
|
|
|
|
reply->access_status = token_access_check(
|
|
token, sd, req->desired_access, &priv, &priv_count, &mapping,
|
|
&reply->access_granted, &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) );
|
|
}
|
|
|
|
if (status != STATUS_SUCCESS)
|
|
set_error( status );
|
|
|
|
release_object( token );
|
|
}
|
|
}
|