mirrored from git://source.winehq.org/git/wine.git
/
token.c
1594 lines (1393 loc) · 54.5 KB
/
token.c
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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 };
#define SID_N(n) struct /* same fields as struct SID */ \
{ \
BYTE Revision; \
BYTE SubAuthorityCount; \
SID_IDENTIFIER_AUTHORITY IdentifierAuthority; \
DWORD SubAuthority[n]; \
}
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 SID high_label_sid = { SID_REVISION, 1, { SECURITY_MANDATORY_LABEL_AUTHORITY }, { SECURITY_MANDATORY_HIGH_RID } };
static const SID_N(5) local_user_sid = { SID_REVISION, 5, { SECURITY_NT_AUTHORITY }, { SECURITY_NT_NON_UNIQUE, 0, 0, 0, 1000 } };
static const SID_N(2) builtin_admins_sid = { SID_REVISION, 2, { SECURITY_NT_AUTHORITY }, { SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS } };
static const SID_N(2) builtin_users_sid = { SID_REVISION, 2, { SECURITY_NT_AUTHORITY }, { SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_USERS } };
static const SID_N(3) builtin_logon_sid = { SID_REVISION, 3, { SECURITY_NT_AUTHORITY }, { SECURITY_LOGON_IDS_RID, 0, 0 } };
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;
const PSID security_builtin_admins_sid = (PSID)&builtin_admins_sid;
const PSID security_builtin_users_sid = (PSID)&builtin_users_sid;
const PSID security_high_label_sid = (PSID)&high_label_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 *owner; /* SID of owner (points to user or one of groups) */
SID *primary_group; /* SID of user's primary group (points to one of groups) */
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_link_name, /* link_name */
NULL, /* unlink_name */
no_open_file, /* open_file */
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 );
}
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;
case SYSTEM_MANDATORY_LABEL_ACE_TYPE:
sid = (const SID *)&((const SYSTEM_MANDATORY_LABEL_ACE *)ace)->SidStart;
sid_size = ace->AceSize - FIELD_OFFSET(SYSTEM_MANDATORY_LABEL_ACE, SidStart);
break;
default:
return FALSE;
}
if (sid_size < FIELD_OFFSET(SID, SubAuthority[0]) || sid_size < security_sid_len( sid ))
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 = security_sid_len( owner );
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 = security_sid_len( group );
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;
}
/* extract security labels from SACL */
ACL *extract_security_labels( const ACL *sacl )
{
size_t size = sizeof(ACL);
const ACE_HEADER *ace;
ACE_HEADER *label_ace;
unsigned int i, count = 0;
ACL *label_acl;
ace = (const ACE_HEADER *)(sacl + 1);
for (i = 0; i < sacl->AceCount; i++, ace = ace_next( ace ))
{
if (ace->AceType == SYSTEM_MANDATORY_LABEL_ACE_TYPE)
{
size += ace->AceSize;
count++;
}
}
label_acl = mem_alloc( size );
if (!label_acl) return NULL;
label_acl->AclRevision = sacl->AclRevision;
label_acl->Sbz1 = 0;
label_acl->AclSize = size;
label_acl->AceCount = count;
label_acl->Sbz2 = 0;
label_ace = (ACE_HEADER *)(label_acl + 1);
ace = (const ACE_HEADER *)(sacl + 1);
for (i = 0; i < sacl->AceCount; i++, ace = ace_next( ace ))
{
if (ace->AceType == SYSTEM_MANDATORY_LABEL_ACE_TYPE)
{
memcpy( label_ace, ace, ace->AceSize );
label_ace = (ACE_HEADER *)ace_next( label_ace );
}
}
return label_acl;
}
/* replace security labels in an existing SACL */
ACL *replace_security_labels( const ACL *old_sacl, const ACL *new_sacl )
{
const ACE_HEADER *ace;
ACE_HEADER *replaced_ace;
size_t size = sizeof(ACL);
unsigned int i, count = 0;
BYTE revision = ACL_REVISION;
ACL *replaced_acl;
if (old_sacl)
{
revision = max( revision, old_sacl->AclRevision );
ace = (const ACE_HEADER *)(old_sacl + 1);
for (i = 0; i < old_sacl->AceCount; i++, ace = ace_next( ace ))
{
if (ace->AceType == SYSTEM_MANDATORY_LABEL_ACE_TYPE) continue;
size += ace->AceSize;
count++;
}
}
if (new_sacl)
{
revision = max( revision, new_sacl->AclRevision );
ace = (const ACE_HEADER *)(new_sacl + 1);
for (i = 0; i < new_sacl->AceCount; i++, ace = ace_next( ace ))
{
if (ace->AceType != SYSTEM_MANDATORY_LABEL_ACE_TYPE) continue;
size += ace->AceSize;
count++;
}
}
replaced_acl = mem_alloc( size );
if (!replaced_acl) return NULL;
replaced_acl->AclRevision = revision;
replaced_acl->Sbz1 = 0;
replaced_acl->AclSize = size;
replaced_acl->AceCount = count;
replaced_acl->Sbz2 = 0;
replaced_ace = (ACE_HEADER *)(replaced_acl + 1);
if (old_sacl)
{
ace = (const ACE_HEADER *)(old_sacl + 1);
for (i = 0; i < old_sacl->AceCount; i++, ace = ace_next( ace ))
{
if (ace->AceType == SYSTEM_MANDATORY_LABEL_ACE_TYPE) continue;
memcpy( replaced_ace, ace, ace->AceSize );
replaced_ace = (ACE_HEADER *)ace_next( replaced_ace );
}
}
if (new_sacl)
{
ace = (const ACE_HEADER *)(new_sacl + 1);
for (i = 0; i < new_sacl->AceCount; i++, ace = ace_next( ace ))
{
if (ace->AceType != SYSTEM_MANDATORY_LABEL_ACE_TYPE) continue;
memcpy( replaced_ace, ace, ace->AceSize );
replaced_ace = (ACE_HEADER *)ace_next( replaced_ace );
}
}
return replaced_acl;
}
/* 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, security_sid_len( user ));
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, security_sid_len( groups[i].Sid ));
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 owner and primary group */
if (!token->primary_group && 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].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 struct security_descriptor *sd )
{
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 */
token->primary_group = NULL;
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 );
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 (!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 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) +
security_sid_len( user );
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)) + security_sid_len( user );
aaa->Mask = GENERIC_ALL;
sid = (SID *)&aaa->SidStart;
memcpy( sid, user, security_sid_len( user ));
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, PSID label_sid )
{
size_t sid_len = security_sid_len( label_sid ), sacl_size, sd_size;
SYSTEM_MANDATORY_LABEL_ACE *smla;
struct security_descriptor *sd;
ACL *sacl;
sacl_size = sizeof(ACL) + FIELD_OFFSET(SYSTEM_MANDATORY_LABEL_ACE, SidStart) + sid_len;
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 = (ACL *)(sd + 1);
sacl->AclRevision = ACL_REVISION;
sacl->Sbz1 = 0;
sacl->AclSize = sacl_size;
sacl->AceCount = 1;
sacl->Sbz2 = 0;
smla = (SYSTEM_MANDATORY_LABEL_ACE *)(sacl + 1);
smla->Header.AceType = SYSTEM_MANDATORY_LABEL_ACE_TYPE;
smla->Header.AceFlags = 0;
smla->Header.AceSize = FIELD_OFFSET(SYSTEM_MANDATORY_LABEL_ACE, SidStart) + sid_len;
smla->Mask = SYSTEM_MANDATORY_LABEL_NO_WRITE_UP;
memcpy( &smla->SidStart, label_sid, sid_len );
assert( sd_is_valid( sd, sd_size ) );
return sd;
}
int token_assign_label( struct token *token, PSID 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 *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;
const SID *user_sid = security_unix_uid_to_sid( getuid() );
ACL *default_dacl = create_default_dacl( user_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, user_sid, 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))
{
if (priv_count) *priv_count = 0;
return STATUS_GENERIC_NOT_MAPPED;
}
dacl = sd_get_dacl( sd, &dacl_present );
owner = sd_get_owner( sd );