server/token.c

   1 /*
   2  * Tokens
   3  *
   4  * Copyright (C) 1998 Alexandre Julliard
   5  * Copyright (C) 2003 Mike McCormack
   6  * Copyright (C) 2005 Robert Shearman
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  21  */
  22
  23 #include "config.h"
  24
  25 #include <assert.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <stdarg.h>
  29
  30 #include "ntstatus.h"
  31 #define WIN32_NO_STATUS
  32 #include "windef.h"
  33 #include "winternl.h"
  34
  35 #include "handle.h"
  36 #include "thread.h"
  37 #include "process.h"
  38 #include "request.h"
  39 #include "security.h"
  40
  41 #include "wine/unicode.h"
  42
  43 #define MAX_SUBAUTH_COUNT 1
  44
  45 const LUID SeIncreaseQuotaPrivilege        = {  5, 0 };
  46 const LUID SeSecurityPrivilege             = {  8, 0 };
  47 const LUID SeTakeOwnershipPrivilege        = {  9, 0 };
  48 const LUID SeLoadDriverPrivilege           = { 10, 0 };
  49 const LUID SeSystemProfilePrivilege        = { 11, 0 };
  50 const LUID SeSystemtimePrivilege           = { 12, 0 };
  51 const LUID SeProfileSingleProcessPrivilege = { 13, 0 };
  52 const LUID SeIncreaseBasePriorityPrivilege = { 14, 0 };
  53 const LUID SeCreatePagefilePrivilege       = { 15, 0 };
  54 const LUID SeBackupPrivilege               = { 17, 0 };
  55 const LUID SeRestorePrivilege              = { 18, 0 };
  56 const LUID SeShutdownPrivilege             = { 19, 0 };
  57 const LUID SeDebugPrivilege                = { 20, 0 };
  58 const LUID SeSystemEnvironmentPrivilege    = { 22, 0 };
  59 const LUID SeChangeNotifyPrivilege         = { 23, 0 };
  60 const LUID SeRemoteShutdownPrivilege       = { 24, 0 };
  61 const LUID SeUndockPrivilege               = { 25, 0 };
  62 const LUID SeManageVolumePrivilege         = { 28, 0 };
  63 const LUID SeImpersonatePrivilege          = { 29, 0 };
  64 const LUID SeCreateGlobalPrivilege         = { 30, 0 };
  65
  66 static const SID world_sid = { SID_REVISION, 1, { SECURITY_WORLD_SID_AUTHORITY }, { SECURITY_WORLD_RID } };
  67 static const SID local_sid = { SID_REVISION, 1, { SECURITY_LOCAL_SID_AUTHORITY }, { SECURITY_LOCAL_RID } };
  68 static const SID interactive_sid = { SID_REVISION, 1, { SECURITY_NT_AUTHORITY }, { SECURITY_INTERACTIVE_RID } };
  69 static const SID authenticated_user_sid = { SID_REVISION, 1, { SECURITY_NT_AUTHORITY }, { SECURITY_AUTHENTICATED_USER_RID } };
  70 static const SID local_system_sid = { SID_REVISION, 1, { SECURITY_NT_AUTHORITY }, { SECURITY_LOCAL_SYSTEM_RID } };
  71 static const PSID security_world_sid = (PSID)&world_sid;
  72 static const PSID security_local_sid = (PSID)&local_sid;
  73 const PSID security_interactive_sid = (PSID)&interactive_sid;
  74 static const PSID security_authenticated_user_sid = (PSID)&authenticated_user_sid;
  75 static const PSID security_local_system_sid = (PSID)&local_system_sid;
  76
  77 static LUID prev_luid_value = { 1000, 0 };
  78
  79 struct token
  80 {
  81     struct object  obj;             /* object header */
  82     LUID           token_id;        /* system-unique id of token */
  83     LUID           modified_id;     /* new id allocated every time token is modified */
  84     struct list    privileges;      /* privileges available to the token */
  85     struct list    groups;          /* groups that the user of this token belongs to (sid_and_attributes) */
  86     SID           *user;            /* SID of user this token represents */
  87     SID           *primary_group;   /* SID of user's primary group */
  88     unsigned       primary;         /* is this a primary or impersonation token? */
  89     ACL           *default_dacl;    /* the default DACL to assign to objects created by this user */
  90     TOKEN_SOURCE   source;          /* source of the token */
  91     SECURITY_IMPERSONATION_LEVEL impersonation_level; /* impersonation level this token is capable of if non-primary token */
  92 };
  93
  94 struct privilege
  95 {
  96     struct list entry;
  97     LUID        luid;
  98     unsigned    enabled  : 1; /* is the privilege currently enabled? */
  99     unsigned    def      : 1; /* is the privilege enabled by default? */
 100 };
 101
 102 struct group
 103 {
 104     struct list entry;
 105     unsigned    enabled  : 1; /* is the sid currently enabled? */
 106     unsigned    def      : 1; /* is the sid enabled by default? */
 107     unsigned    logon    : 1; /* is this a logon sid? */
 108     unsigned    mandatory: 1; /* is this sid always enabled? */
 109     unsigned    owner    : 1; /* can this sid be an owner of an object? */
 110     unsigned    resource : 1; /* is this a domain-local group? */
 111     unsigned    deny_only: 1; /* is this a sid that should be use for denying only? */
 112     SID         sid;
 113 };
 114
 115 static void token_dump( struct object *obj, int verbose );
 116 static unsigned int token_map_access( struct object *obj, unsigned int access );
 117 static void token_destroy( struct object *obj );
 118
 119 static const struct object_ops token_ops =
 120 {
 121     sizeof(struct token),      /* size */
 122     token_dump,                /* dump */
 123     no_add_queue,              /* add_queue */
 124     NULL,                      /* remove_queue */
 125     NULL,                      /* signaled */
 126     NULL,                      /* satisfied */
 127     no_signal,                 /* signal */
 128     no_get_fd,                 /* get_fd */
 129     token_map_access,          /* map_access */
 130     no_lookup_name,            /* lookup_name */
 131     no_close_handle,           /* close_handle */
 132     token_destroy              /* destroy */
 133 };
 134
 135
 136 static void token_dump( struct object *obj, int verbose )
 137 {
 138     fprintf( stderr, "Security token\n" );
 139     /* FIXME: dump token members */
 140 }
 141
 142 static unsigned int token_map_access( struct object *obj, unsigned int access )
 143 {
 144     if (access & GENERIC_READ)    access |= TOKEN_READ;
 145     if (access & GENERIC_WRITE)   access |= TOKEN_WRITE;
 146     if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
 147     if (access & GENERIC_ALL)     access |= TOKEN_ALL_ACCESS;
 148     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 149 }
 150
 151 static SID *security_sid_alloc( const SID_IDENTIFIER_AUTHORITY *idauthority, int subauthcount, const unsigned int subauth[] )
 152 {
 153     int i;
 154     SID *sid = mem_alloc( FIELD_OFFSET(SID, SubAuthority[subauthcount]) );
 155     if (!sid) return NULL;
 156     sid->Revision = SID_REVISION;
 157     sid->SubAuthorityCount = subauthcount;
 158     sid->IdentifierAuthority = *idauthority;
 159     for (i = 0; i < subauthcount; i++)
 160         sid->SubAuthority[i] = subauth[i];
 161     return sid;
 162 }
 163
 164 static inline int security_equal_sid( const SID *sid1, const SID *sid2 )
 165 {
 166     return ((sid1->SubAuthorityCount == sid2->SubAuthorityCount) &&
 167         !memcmp( sid1, sid2, FIELD_OFFSET(SID, SubAuthority[sid1->SubAuthorityCount]) ));
 168 }
 169
 170 void security_set_thread_token( struct thread *thread, obj_handle_t handle )
 171 {
 172     if (!handle)
 173     {
 174         if (thread->token)
 175             release_object( thread->token );
 176         thread->token = NULL;
 177     }
 178     else
 179     {
 180         struct token *token = (struct token *)get_handle_obj( current->process,
 181                                                               handle,
 182                                                               TOKEN_IMPERSONATE,
 183                                                               &token_ops );
 184         if (token)
 185         {
 186             if (thread->token)
 187                 release_object( thread->token );
 188             thread->token = token;
 189         }
 190     }
 191 }
 192
 193 static const ACE_HEADER *ace_next( const ACE_HEADER *ace )
 194 {
 195     return (const ACE_HEADER *)((const char *)ace + ace->AceSize);
 196 }
 197
 198 static int acl_is_valid( const ACL *acl, data_size_t size )
 199 {
 200     ULONG i;
 201     const ACE_HEADER *ace;
 202
 203     if (size < sizeof(ACL))
 204         return FALSE;
 205
 206     size = min(size, MAX_ACL_LEN);
 207
 208     size -= sizeof(ACL);
 209
 210     ace = (const ACE_HEADER *)(acl + 1);
 211     for (i = 0; i < acl->AceCount; i++)
 212     {
 213         const SID *sid;
 214         data_size_t sid_size;
 215
 216         if (size < sizeof(ACE_HEADER))
 217             return FALSE;
 218         if (size < ace->AceSize)
 219             return FALSE;
 220         size -= ace->AceSize;
 221         switch (ace->AceType)
 222         {
 223         case ACCESS_DENIED_ACE_TYPE:
 224             sid = (const SID *)&((const ACCESS_DENIED_ACE *)ace)->SidStart;
 225             sid_size = ace->AceSize - FIELD_OFFSET(ACCESS_DENIED_ACE, SidStart);
 226             break;
 227         case ACCESS_ALLOWED_ACE_TYPE:
 228             sid = (const SID *)&((const ACCESS_ALLOWED_ACE *)ace)->SidStart;
 229             sid_size = ace->AceSize - FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart);
 230             break;
 231         case SYSTEM_AUDIT_ACE_TYPE:
 232             sid = (const SID *)&((const SYSTEM_AUDIT_ACE *)ace)->SidStart;
 233             sid_size = ace->AceSize - FIELD_OFFSET(SYSTEM_AUDIT_ACE, SidStart);
 234             break;
 235         case SYSTEM_ALARM_ACE_TYPE:
 236             sid = (const SID *)&((const SYSTEM_ALARM_ACE *)ace)->SidStart;
 237             sid_size = ace->AceSize - FIELD_OFFSET(SYSTEM_ALARM_ACE, SidStart);
 238             break;
 239         default:
 240             return FALSE;
 241         }
 242         if (sid_size < FIELD_OFFSET(SID, SubAuthority[0]) ||
 243             sid_size < FIELD_OFFSET(SID, SubAuthority[sid->SubAuthorityCount]))
 244             return FALSE;
 245         ace = ace_next( ace );
 246     }
 247     return TRUE;
 248 }
 249
 250 /* gets the discretionary access control list from a security descriptor */
 251 static inline const ACL *sd_get_dacl( const struct security_descriptor *sd, int *present )
 252 {
 253     *present = (sd->control & SE_DACL_PRESENT ? TRUE : FALSE);
 254
 255     if (sd->dacl_len)
 256         return (const ACL *)((const char *)(sd + 1) +
 257             sd->owner_len + sd->group_len + sd->sacl_len);
 258     else
 259         return NULL;
 260 }
 261
 262 /* gets the system access control list from a security descriptor */
 263 static inline const ACL *sd_get_sacl( const struct security_descriptor *sd, int *present )
 264 {
 265     *present = (sd->control & SE_SACL_PRESENT ? TRUE : FALSE);
 266
 267     if (sd->sacl_len)
 268         return (const ACL *)((const char *)(sd + 1) +
 269             sd->owner_len + sd->group_len);
 270     else
 271         return NULL;
 272 }
 273
 274 /* gets the owner from a security descriptor */
 275 static inline const SID *sd_get_owner( const struct security_descriptor *sd )
 276 {
 277     if (sd->owner_len)
 278         return (const SID *)(sd + 1);
 279     else
 280         return NULL;
 281 }
 282
 283 /* gets the primary group from a security descriptor */
 284 static inline const SID *sd_get_group( const struct security_descriptor *sd )
 285 {
 286     if (sd->group_len)
 287         return (const SID *)((const char *)(sd + 1) + sd->owner_len);
 288     else
 289         return NULL;
 290 }
 291
 292 /* checks whether all members of a security descriptor fit inside the size
 293  * of memory specified */
 294 static int sd_is_valid( const struct security_descriptor *sd, data_size_t size )
 295 {
 296     size_t offset = sizeof(struct security_descriptor);
 297     const SID *group;
 298     const SID *owner;
 299     const ACL *sacl;
 300     const ACL *dacl;
 301     int dummy;
 302
 303     if (size < offset)
 304         return FALSE;
 305
 306     if ((sd->owner_len >= FIELD_OFFSET(SID, SubAuthority[255])) ||
 307         (offset + sd->owner_len > size))
 308         return FALSE;
 309     owner = sd_get_owner( sd );
 310     if (owner)
 311     {
 312         size_t needed_size = FIELD_OFFSET(SID, SubAuthority[owner->SubAuthorityCount]);
 313         if ((sd->owner_len < sizeof(SID)) || (needed_size > sd->owner_len))
 314             return FALSE;
 315     }
 316     offset += sd->owner_len;
 317
 318     if ((sd->group_len >= FIELD_OFFSET(SID, SubAuthority[255])) ||
 319         (offset + sd->group_len > size))
 320         return FALSE;
 321     group = sd_get_group( sd );
 322     if (group)
 323     {
 324         size_t needed_size = FIELD_OFFSET(SID, SubAuthority[group->SubAuthorityCount]);
 325         if ((sd->group_len < sizeof(SID)) || (needed_size > sd->group_len))
 326             return FALSE;
 327     }
 328     offset += sd->group_len;
 329
 330     if ((sd->sacl_len >= MAX_ACL_LEN) || (offset + sd->sacl_len > size))
 331         return FALSE;
 332     sacl = sd_get_sacl( sd, &dummy );
 333     if (sacl && !acl_is_valid( sacl, sd->sacl_len ))
 334         return FALSE;
 335     offset += sd->sacl_len;
 336
 337     if ((sd->dacl_len >= MAX_ACL_LEN) || (offset + sd->dacl_len > size))
 338         return FALSE;
 339     dacl = sd_get_dacl( sd, &dummy );
 340     if (dacl && !acl_is_valid( dacl, sd->dacl_len ))
 341         return FALSE;
 342     offset += sd->dacl_len;
 343
 344     return TRUE;
 345 }
 346
 347 /* maps from generic rights to specific rights as given by a mapping */
 348 static inline void map_generic_mask(unsigned int *mask, const GENERIC_MAPPING *mapping)
 349 {
 350     if (*mask & GENERIC_READ) *mask |= mapping->GenericRead;
 351     if (*mask & GENERIC_WRITE) *mask |= mapping->GenericWrite;
 352     if (*mask & GENERIC_EXECUTE) *mask |= mapping->GenericExecute;
 353     if (*mask & GENERIC_ALL) *mask |= mapping->GenericAll;
 354     *mask &= 0x0FFFFFFF;
 355 }
 356
 357 static inline int is_equal_luid( const LUID *luid1, const LUID *luid2 )
 358 {
 359     return (luid1->LowPart == luid2->LowPart && luid1->HighPart == luid2->HighPart);
 360 }
 361
 362 static inline void allocate_luid( LUID *luid )
 363 {
 364     prev_luid_value.LowPart++;
 365     *luid = prev_luid_value;
 366 }
 367
 368 static inline void luid_and_attr_from_privilege( LUID_AND_ATTRIBUTES *out, const struct privilege *in)
 369 {
 370     out->Luid = in->luid;
 371     out->Attributes =
 372         (in->enabled ? SE_PRIVILEGE_ENABLED : 0) |
 373         (in->def ? SE_PRIVILEGE_ENABLED_BY_DEFAULT : 0);
 374 }
 375
 376 static struct privilege *privilege_add( struct token *token, const LUID *luid, int enabled )
 377 {
 378     struct privilege *privilege = mem_alloc( sizeof(*privilege) );
 379     if (privilege)
 380     {
 381         privilege->luid = *luid;
 382         privilege->def = privilege->enabled = (enabled != 0);
 383         list_add_tail( &token->privileges, &privilege->entry );
 384     }
 385     return privilege;
 386 }
 387
 388 static inline void privilege_remove( struct privilege *privilege )
 389 {
 390     list_remove( &privilege->entry );
 391     free( privilege );
 392 }
 393
 394 static void token_destroy( struct object *obj )
 395 {
 396     struct token* token;
 397     struct list *cursor, *cursor_next;
 398
 399     assert( obj->ops == &token_ops );
 400     token = (struct token *)obj;
 401
 402     free( token->user );
 403
 404     LIST_FOR_EACH_SAFE( cursor, cursor_next, &token->privileges )
 405     {
 406         struct privilege *privilege = LIST_ENTRY( cursor, struct privilege, entry );
 407         privilege_remove( privilege );
 408     }
 409
 410     LIST_FOR_EACH_SAFE( cursor, cursor_next, &token->groups )
 411     {
 412         struct group *group = LIST_ENTRY( cursor, struct group, entry );
 413         list_remove( &group->entry );
 414         free( group );
 415     }
 416
 417     free( token->default_dacl );
 418 }
 419
 420 /* creates a new token.
 421  *  groups may be NULL if group_count is 0.
 422  *  privs may be NULL if priv_count is 0.
 423  *  default_dacl may be NULL, indicating that all objects created by the user
 424  *   are unsecured.
 425  *  modified_id may be NULL, indicating that a new modified_id luid should be
 426  *   allocated.
 427  */
 428 static struct token *create_token( unsigned primary, const SID *user,
 429                                    const SID_AND_ATTRIBUTES *groups, unsigned int group_count,
 430                                    const LUID_AND_ATTRIBUTES *privs, unsigned int priv_count,
 431                                    const ACL *default_dacl, TOKEN_SOURCE source,
 432                                    const LUID *modified_id,
 433                                    SECURITY_IMPERSONATION_LEVEL impersonation_level )
 434 {
 435     struct token *token = alloc_object( &token_ops );
 436     if (token)
 437     {
 438         unsigned int i;
 439
 440         allocate_luid( &token->token_id );
 441         if (modified_id)
 442             token->modified_id = *modified_id;
 443         else
 444             allocate_luid( &token->modified_id );
 445         list_init( &token->privileges );
 446         list_init( &token->groups );
 447         token->primary = primary;
 448         /* primary tokens don't have impersonation levels */
 449         if (primary)
 450             token->impersonation_level = -1;
 451         else
 452             token->impersonation_level = impersonation_level;
 453         token->default_dacl = NULL;
 454         token->primary_group = NULL;
 455
 456         /* copy user */
 457         token->user = memdup( user, FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) );
 458         if (!token->user)
 459         {
 460             release_object( token );
 461             return NULL;
 462         }
 463
 464         /* copy groups */
 465         for (i = 0; i < group_count; i++)
 466         {
 467             size_t size = FIELD_OFFSET( struct group, sid.SubAuthority[((const SID *)groups[i].Sid)->SubAuthorityCount] );
 468             struct group *group = mem_alloc( size );
 469
 470             if (!group)
 471             {
 472                 release_object( token );
 473                 return NULL;
 474             }
 475             memcpy( &group->sid, groups[i].Sid, FIELD_OFFSET( SID, SubAuthority[((const SID *)groups[i].Sid)->SubAuthorityCount] ) );
 476             group->enabled = TRUE;
 477             group->def = TRUE;
 478             group->logon = FALSE;
 479             group->mandatory = (groups[i].Attributes & SE_GROUP_MANDATORY) ? TRUE : FALSE;
 480             group->owner = groups[i].Attributes & SE_GROUP_OWNER ? TRUE : FALSE;
 481             group->resource = FALSE;
 482             group->deny_only = FALSE;
 483             list_add_tail( &token->groups, &group->entry );
 484             /* Use first owner capable group as an owner */
 485             if (!token->primary_group && group->owner)
 486                 token->primary_group = &group->sid;
 487         }
 488
 489         /* copy privileges */
 490         for (i = 0; i < priv_count; i++)
 491         {
 492             /* note: we don't check uniqueness: the caller must make sure
 493              * privs doesn't contain any duplicate luids */
 494             if (!privilege_add( token, &privs[i].Luid,
 495                                 privs[i].Attributes & SE_PRIVILEGE_ENABLED ))
 496             {
 497                 release_object( token );
 498                 return NULL;
 499             }
 500         }
 501
 502         if (default_dacl)
 503         {
 504             token->default_dacl = memdup( default_dacl, default_dacl->AclSize );
 505             if (!token->default_dacl)
 506             {
 507                 release_object( token );
 508                 return NULL;
 509             }
 510         }
 511
 512         token->source = source;
 513     }
 514     return token;
 515 }
 516
 517 static ACL *create_default_dacl( const SID *user )
 518 {
 519     ACCESS_ALLOWED_ACE *aaa;
 520     ACL *default_dacl;
 521     SID *sid;
 522     size_t default_dacl_size = sizeof(ACL) +
 523                                2*(sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD)) +
 524                                sizeof(local_system_sid) +
 525                                FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
 526
 527     default_dacl = mem_alloc( default_dacl_size );
 528     if (!default_dacl) return NULL;
 529
 530     default_dacl->AclRevision = MAX_ACL_REVISION;
 531     default_dacl->Sbz1 = 0;
 532     default_dacl->AclSize = default_dacl_size;
 533     default_dacl->AceCount = 2;
 534     default_dacl->Sbz2 = 0;
 535
 536     /* GENERIC_ALL for Local System */
 537     aaa = (ACCESS_ALLOWED_ACE *)(default_dacl + 1);
 538     aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 539     aaa->Header.AceFlags = 0;
 540     aaa->Header.AceSize = (sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD)) +
 541                           sizeof(local_system_sid);
 542     aaa->Mask = GENERIC_ALL;
 543     sid = (SID *)&aaa->SidStart;
 544     memcpy( sid, &local_system_sid, sizeof(local_system_sid) );
 545
 546     /* GENERIC_ALL for specified user */
 547     aaa = (ACCESS_ALLOWED_ACE *)((char *)aaa + aaa->Header.AceSize);
 548     aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 549     aaa->Header.AceFlags = 0;
 550     aaa->Header.AceSize = (sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD)) +
 551                           FIELD_OFFSET( SID, SubAuthority[user->SubAuthorityCount] );
 552     aaa->Mask = GENERIC_ALL;
 553     sid = (SID *)&aaa->SidStart;
 554     memcpy( sid, user, FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) );
 555
 556     return default_dacl;
 557 }
 558
 559 struct sid_data
 560 {
 561     SID_IDENTIFIER_AUTHORITY idauth;
 562     int count;
 563     unsigned int subauth[MAX_SUBAUTH_COUNT];
 564 };
 565
 566 struct token *token_create_admin( void )
 567 {
 568     struct token *token = NULL;
 569     static const SID_IDENTIFIER_AUTHORITY nt_authority = { SECURITY_NT_AUTHORITY };
 570     static const unsigned int alias_admins_subauth[] = { SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS };
 571     static const unsigned int alias_users_subauth[] = { SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_USERS };
 572     PSID alias_admins_sid;
 573     PSID alias_users_sid;
 574     /* note: should be the owner specified in the token */
 575     ACL *default_dacl = create_default_dacl( &interactive_sid );
 576
 577     alias_admins_sid = security_sid_alloc( &nt_authority, sizeof(alias_admins_subauth)/sizeof(alias_admins_subauth[0]),
 578                                            alias_admins_subauth );
 579     alias_users_sid = security_sid_alloc( &nt_authority, sizeof(alias_users_subauth)/sizeof(alias_users_subauth[0]),
 580                                           alias_users_subauth );
 581
 582     if (alias_admins_sid && alias_users_sid && default_dacl)
 583     {
 584         const LUID_AND_ATTRIBUTES admin_privs[] =
 585         {
 586             { SeChangeNotifyPrivilege        , SE_PRIVILEGE_ENABLED },
 587             { SeSecurityPrivilege            , 0                    },
 588             { SeBackupPrivilege              , 0                    },
 589             { SeRestorePrivilege             , 0                    },
 590             { SeSystemtimePrivilege          , 0                    },
 591             { SeShutdownPrivilege            , 0                    },
 592             { SeRemoteShutdownPrivilege      , 0                    },
 593             { SeTakeOwnershipPrivilege       , 0                    },
 594             { SeDebugPrivilege               , 0                    },
 595             { SeSystemEnvironmentPrivilege   , 0                    },
 596             { SeSystemProfilePrivilege       , 0                    },
 597             { SeProfileSingleProcessPrivilege, 0                    },
 598             { SeIncreaseBasePriorityPrivilege, 0                    },
 599             { SeLoadDriverPrivilege          , 0                    },
 600             { SeCreatePagefilePrivilege      , 0                    },
 601             { SeIncreaseQuotaPrivilege       , 0                    },
 602             { SeUndockPrivilege              , 0                    },
 603             { SeManageVolumePrivilege        , 0                    },
 604             { SeImpersonatePrivilege         , SE_PRIVILEGE_ENABLED },
 605             { SeCreateGlobalPrivilege        , SE_PRIVILEGE_ENABLED },
 606         };
 607         /* note: we don't include non-builtin groups here for the user -
 608          * telling us these is the job of a client-side program */
 609         const SID_AND_ATTRIBUTES admin_groups[] =
 610         {
 611             { security_world_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
 612             { security_local_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
 613             { security_interactive_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
 614             { security_authenticated_user_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
 615             { alias_admins_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY|SE_GROUP_OWNER },
 616             { alias_users_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
 617         };
 618         static const TOKEN_SOURCE admin_source = {"SeMgr", {0, 0}};
 619         /* note: we just set the user sid to be the interactive builtin sid -
 620          * we should really translate the UNIX user id to a sid */
 621         token = create_token( TRUE, &interactive_sid,
 622                             admin_groups, sizeof(admin_groups)/sizeof(admin_groups[0]),
 623                             admin_privs, sizeof(admin_privs)/sizeof(admin_privs[0]),
 624                             default_dacl, admin_source, NULL, -1 );
 625         /* we really need a primary group */
 626         assert( token->primary_group );
 627     }
 628
 629     free( alias_admins_sid );
 630     free( alias_users_sid );
 631     free( default_dacl );
 632
 633     return token;
 634 }
 635
 636 static struct privilege *token_find_privilege( struct token *token, const LUID *luid, int enabled_only )
 637 {
 638     struct privilege *privilege;
 639     LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
 640     {
 641         if (is_equal_luid( luid, &privilege->luid ))
 642         {
 643             if (enabled_only && !privilege->enabled)
 644                 return NULL;
 645             return privilege;
 646         }
 647     }
 648     return NULL;
 649 }
 650
 651 static unsigned int token_adjust_privileges( struct token *token, const LUID_AND_ATTRIBUTES *privs,
 652                                              unsigned int count, LUID_AND_ATTRIBUTES *mod_privs,
 653                                              unsigned int mod_privs_count )
 654 {
 655     unsigned int i, modified_count = 0;
 656
 657     /* mark as modified */
 658     allocate_luid( &token->modified_id );
 659
 660     for (i = 0; i < count; i++)
 661     {
 662         struct privilege *privilege =
 663             token_find_privilege( token, &privs[i].Luid, FALSE );
 664         if (!privilege)
 665         {
 666             set_error( STATUS_NOT_ALL_ASSIGNED );
 667             continue;
 668         }
 669
 670         if (privs[i].Attributes & SE_PRIVILEGE_REMOVE)
 671             privilege_remove( privilege );
 672         else
 673         {
 674             /* save previous state for caller */
 675             if (mod_privs_count)
 676             {
 677                 luid_and_attr_from_privilege(mod_privs, privilege);
 678                 mod_privs++;
 679                 mod_privs_count--;
 680                 modified_count++;
 681             }
 682
 683             if (privs[i].Attributes & SE_PRIVILEGE_ENABLED)
 684                 privilege->enabled = TRUE;
 685             else
 686                 privilege->enabled = FALSE;
 687         }
 688     }
 689     return modified_count;
 690 }
 691
 692 static void token_disable_privileges( struct token *token )
 693 {
 694     struct privilege *privilege;
 695
 696     /* mark as modified */
 697     allocate_luid( &token->modified_id );
 698
 699     LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
 700         privilege->enabled = FALSE;
 701 }
 702
 703 int token_check_privileges( struct token *token, int all_required,
 704                             const LUID_AND_ATTRIBUTES *reqprivs,
 705                             unsigned int count, LUID_AND_ATTRIBUTES *usedprivs)
 706 {
 707     unsigned int i, enabled_count = 0;
 708
 709     for (i = 0; i < count; i++)
 710     {
 711         struct privilege *privilege =
 712             token_find_privilege( token, &reqprivs[i].Luid, TRUE );
 713
 714         if (usedprivs)
 715             usedprivs[i] = reqprivs[i];
 716
 717         if (privilege && privilege->enabled)
 718         {
 719             enabled_count++;
 720             if (usedprivs)
 721                 usedprivs[i].Attributes |= SE_PRIVILEGE_USED_FOR_ACCESS;
 722         }
 723     }
 724
 725     if (all_required)
 726         return (enabled_count == count);
 727     else
 728         return (enabled_count > 0);
 729 }
 730
 731 static int token_sid_present( struct token *token, const SID *sid, int deny )
 732 {
 733     struct group *group;
 734
 735     if (security_equal_sid( token->user, sid )) return TRUE;
 736
 737     LIST_FOR_EACH_ENTRY( group, &token->groups, struct group, entry )
 738     {
 739         if (!group->enabled) continue;
 740         if (group->deny_only && !deny) continue;
 741
 742         if (security_equal_sid( &group->sid, sid )) return TRUE;
 743     }
 744
 745     return FALSE;
 746 }
 747
 748 /* Checks access to a security descriptor. 'sd' must have been validated by
 749  * caller. It returns STATUS_SUCCESS if call succeeded or an error indicating
 750  * the reason. 'status' parameter will indicate if access is granted or denied.
 751  *
 752  * If both returned value and 'status' are STATUS_SUCCESS then access is granted.
 753  */
 754 static unsigned int token_access_check( struct token *token,
 755                                  const struct security_descriptor *sd,
 756                                  unsigned int desired_access,
 757                                  LUID_AND_ATTRIBUTES *privs,
 758                                  unsigned int *priv_count,
 759                                  const GENERIC_MAPPING *mapping,
 760                                  unsigned int *granted_access,
 761                                  unsigned int *status )
 762 {
 763     unsigned int current_access = 0;
 764     unsigned int denied_access = 0;
 765     ULONG i;
 766     const ACL *dacl;
 767     int dacl_present;
 768     const ACE_HEADER *ace;
 769     const SID *owner;
 770
 771     /* assume no access rights */
 772     *granted_access = 0;
 773
 774     /* fail if desired_access contains generic rights */
 775     if (desired_access & (GENERIC_READ|GENERIC_WRITE|GENERIC_EXECUTE|GENERIC_ALL))
 776     {
 777         *priv_count = 0;
 778         return STATUS_GENERIC_NOT_MAPPED;
 779     }
 780
 781     dacl = sd_get_dacl( sd, &dacl_present );
 782     owner = sd_get_owner( sd );
 783     if (!owner || !sd_get_group( sd ))
 784     {
 785         *priv_count = 0;
 786         return STATUS_INVALID_SECURITY_DESCR;
 787     }
 788
 789     /* 1: Grant desired access if the object is unprotected */
 790     if (!dacl_present)
 791     {
 792         *priv_count = 0;
 793         *granted_access = desired_access;
 794         return *status = STATUS_SUCCESS;
 795     }
 796     if (!dacl)
 797     {
 798         *priv_count = 0;
 799         *status = STATUS_ACCESS_DENIED;
 800         return STATUS_SUCCESS;
 801     }
 802
 803     /* 2: Check if caller wants access to system security part. Note: access
 804      * is only granted if specifically asked for */
 805     if (desired_access & ACCESS_SYSTEM_SECURITY)
 806     {
 807         const LUID_AND_ATTRIBUTES security_priv = { SeSecurityPrivilege, 0 };
 808         LUID_AND_ATTRIBUTES retpriv = security_priv;
 809         if (token_check_privileges( token, TRUE, &security_priv, 1, &retpriv ))
 810         {
 811             if (priv_count)
 812             {
 813                 /* assumes that there will only be one privilege to return */
 814                 if (*priv_count >= 1)
 815                 {
 816                     *priv_count = 1;
 817                     *privs = retpriv;
 818                 }
 819                 else
 820                 {
 821                     *priv_count = 1;
 822                     return STATUS_BUFFER_TOO_SMALL;
 823                 }
 824             }
 825             current_access |= ACCESS_SYSTEM_SECURITY;
 826             if (desired_access == current_access)
 827             {
 828                 *granted_access = current_access;
 829                 return *status = STATUS_SUCCESS;
 830             }
 831         }
 832         else
 833         {
 834             *priv_count = 0;
 835             *status = STATUS_PRIVILEGE_NOT_HELD;
 836             return STATUS_SUCCESS;
 837         }
 838     }
 839     else if (priv_count) *priv_count = 0;
 840
 841     /* 3: Check whether the token is the owner */
 842     /* NOTE: SeTakeOwnershipPrivilege is not checked for here - it is instead
 843      * checked when a "set owner" call is made, overriding the access rights
 844      * determined here. */
 845     if (token_sid_present( token, owner, FALSE ))
 846     {
 847         current_access |= (READ_CONTROL | WRITE_DAC);
 848         if (desired_access == current_access)
 849         {
 850             *granted_access = current_access;
 851             return *status = STATUS_SUCCESS;
 852         }
 853     }
 854
 855     /* 4: Grant rights according to the DACL */
 856     ace = (const ACE_HEADER *)(dacl + 1);
 857     for (i = 0; i < dacl->AceCount; i++)
 858     {
 859         const ACCESS_ALLOWED_ACE *aa_ace;
 860         const ACCESS_DENIED_ACE *ad_ace;
 861         const SID *sid;
 862         switch (ace->AceType)
 863         {
 864         case ACCESS_DENIED_ACE_TYPE:
 865             ad_ace = (const ACCESS_DENIED_ACE *)ace;
 866             sid = (const SID *)&ad_ace->SidStart;
 867             if (token_sid_present( token, sid, TRUE ))
 868             {
 869                 unsigned int access = ad_ace->Mask;
 870                 map_generic_mask(&access, mapping);
 871                 if (desired_access & MAXIMUM_ALLOWED)
 872                     denied_access |= access;
 873                 else
 874                 {
 875                     denied_access |= (access & ~current_access);
 876                     if (desired_access & access) goto done;
 877                 }
 878             }
 879             break;
 880         case ACCESS_ALLOWED_ACE_TYPE:
 881             aa_ace = (const ACCESS_ALLOWED_ACE *)ace;
 882             sid = (const SID *)&aa_ace->SidStart;
 883             if (token_sid_present( token, sid, FALSE ))
 884             {
 885                 unsigned int access = aa_ace->Mask;
 886                 map_generic_mask(&access, mapping);
 887                 if (desired_access & MAXIMUM_ALLOWED)
 888                     current_access |= access;
 889                 else
 890                     current_access |= (access & ~denied_access);
 891             }
 892             break;
 893         }
 894
 895         /* don't bother carrying on checking if we've already got all of
 896             * rights we need */
 897         if (desired_access == *granted_access)
 898             break;
 899
 900         ace = ace_next( ace );
 901     }
 902
 903 done:
 904     if (desired_access & MAXIMUM_ALLOWED)
 905         *granted_access = current_access & ~denied_access;
 906     else
 907         if ((current_access & desired_access) == desired_access)
 908             *granted_access = current_access & desired_access;
 909         else
 910             *granted_access = 0;
 911
 912     *status = *granted_access ? STATUS_SUCCESS : STATUS_ACCESS_DENIED;
 913     return STATUS_SUCCESS;
 914 }
 915
 916 const ACL *token_get_default_dacl( struct token *token )
 917 {
 918     return token->default_dacl;
 919 }
 920
 921 static void set_object_sd( struct object *obj, const struct security_descriptor *sd,
 922                            unsigned int set_info )
 923 {
 924     struct security_descriptor new_sd, *pnew_sd;
 925     int present;
 926     const SID *owner, *group;
 927     const ACL *sacl, *dacl;
 928     char *ptr;
 929
 930     if (!set_info) return;
 931
 932     new_sd.control = sd->control & ~SE_SELF_RELATIVE;
 933
 934     owner = sd_get_owner( sd );
 935     if (set_info & OWNER_SECURITY_INFORMATION && owner)
 936         new_sd.owner_len = sd->owner_len;
 937     else
 938     {
 939         owner = current->process->token->user;
 940         new_sd.owner_len = FIELD_OFFSET(SID, SubAuthority[owner->SubAuthorityCount]);
 941         new_sd.control |= SE_OWNER_DEFAULTED;
 942     }
 943
 944     group = sd_get_group( sd );
 945     if (set_info & GROUP_SECURITY_INFORMATION && group)
 946         new_sd.group_len = sd->group_len;
 947     else
 948     {
 949         group = current->process->token->primary_group;
 950         new_sd.group_len = FIELD_OFFSET(SID, SubAuthority[group->SubAuthorityCount]);
 951         new_sd.control |= SE_GROUP_DEFAULTED;
 952     }
 953
 954     new_sd.control |= SE_SACL_PRESENT;
 955     sacl = sd_get_sacl( sd, &present );
 956     if (set_info & SACL_SECURITY_INFORMATION && present)
 957         new_sd.sacl_len = sd->sacl_len;
 958     else
 959     {
 960         if (obj->sd) sacl = sd_get_sacl( obj->sd, &present );
 961
 962         if (obj->sd && present)
 963             new_sd.sacl_len = obj->sd->sacl_len;
 964         else
 965         {
 966             new_sd.sacl_len = 0;
 967             new_sd.control |= SE_SACL_DEFAULTED;
 968         }
 969     }
 970
 971     new_sd.control |= SE_DACL_PRESENT;
 972     dacl = sd_get_dacl( sd, &present );
 973     if (set_info & DACL_SECURITY_INFORMATION && present)
 974         new_sd.dacl_len = sd->dacl_len;
 975     else
 976     {
 977         if (obj->sd) dacl = sd_get_dacl( obj->sd, &present );
 978
 979         if (obj->sd && present)
 980             new_sd.dacl_len = obj->sd->dacl_len;
 981         else
 982         {
 983             dacl = token_get_default_dacl( current->process->token );
 984             new_sd.dacl_len = dacl->AclSize;
 985             new_sd.control |= SE_DACL_DEFAULTED;
 986         }
 987     }
 988
 989     ptr = mem_alloc( sizeof(new_sd) + new_sd.owner_len + new_sd.group_len +
 990                      new_sd.sacl_len + new_sd.dacl_len );
 991     if (!ptr) return;
 992     pnew_sd = (struct security_descriptor*)ptr;
 993
 994     memcpy( ptr, &new_sd, sizeof(new_sd) );
 995     ptr += sizeof(new_sd);
 996     memcpy( ptr, owner, new_sd.owner_len );
 997     ptr += new_sd.owner_len;
 998     memcpy( ptr, group, new_sd.group_len );
 999     ptr += new_sd.group_len;
1000     memcpy( ptr, sacl, new_sd.sacl_len );
1001     ptr += new_sd.sacl_len;
1002     memcpy( ptr, dacl, new_sd.dacl_len );
1003
1004     free( obj->sd );
1005     obj->sd = pnew_sd;
1006 }
1007
1008 int check_object_access(struct object *obj, unsigned int *access)
1009 {
1010     GENERIC_MAPPING mapping;
1011     struct token *token = current->token ? current->token : current->process->token;
1012     LUID_AND_ATTRIBUTES priv;
1013     unsigned int status, priv_count = 1;
1014     int res;
1015
1016     mapping.GenericAll = obj->ops->map_access( obj, GENERIC_ALL );
1017
1018     if (!obj->sd)
1019     {
1020         if (*access & MAXIMUM_ALLOWED)
1021             *access = mapping.GenericAll;
1022         return TRUE;
1023     }
1024
1025     mapping.GenericRead  = obj->ops->map_access( obj, GENERIC_READ );
1026     mapping.GenericWrite = obj->ops->map_access( obj, GENERIC_WRITE );
1027     mapping.GenericExecute = obj->ops->map_access( obj, GENERIC_EXECUTE );
1028
1029     res = token_access_check( token, obj->sd, *access, &priv, &priv_count,
1030                               &mapping, access, &status ) == STATUS_SUCCESS &&
1031           status == STATUS_SUCCESS;
1032
1033     if (!res) set_error( STATUS_ACCESS_DENIED );
1034     return res;
1035 }
1036
1037
1038 /* open a security token */
1039 DECL_HANDLER(open_token)
1040 {
1041     if (req->flags & OPEN_TOKEN_THREAD)
1042     {
1043         struct thread *thread = get_thread_from_handle( req->handle, 0 );
1044         if (thread)
1045         {
1046             if (thread->token)
1047             {
1048                 if (thread->token->impersonation_level <= SecurityAnonymous)
1049                     set_error( STATUS_CANT_OPEN_ANONYMOUS );
1050                 else
1051                     reply->token = alloc_handle( current->process, thread->token,
1052                                                  req->access, req->attributes );
1053             }
1054             else
1055                 set_error( STATUS_NO_TOKEN );
1056             release_object( thread );
1057         }
1058     }
1059     else
1060     {
1061         struct process *process = get_process_from_handle( req->handle, 0 );
1062         if (process)
1063         {
1064             if (process->token)
1065                 reply->token = alloc_handle( current->process, process->token, req->access,
1066                                              req->attributes );
1067             else
1068                 set_error( STATUS_NO_TOKEN );
1069             release_object( process );
1070         }
1071     }
1072 }
1073
1074 /* adjust the privileges held by a token */
1075 DECL_HANDLER(adjust_token_privileges)
1076 {
1077     struct token *token;
1078     unsigned int access = TOKEN_ADJUST_PRIVILEGES;
1079
1080     if (req->get_modified_state) access |= TOKEN_QUERY;
1081
1082     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1083                                                  access, &token_ops )))
1084     {
1085         const LUID_AND_ATTRIBUTES *privs = get_req_data();
1086         LUID_AND_ATTRIBUTES *modified_privs = NULL;
1087         unsigned int priv_count = get_req_data_size() / sizeof(LUID_AND_ATTRIBUTES);
1088         unsigned int modified_priv_count = 0;
1089
1090         if (req->get_modified_state && !req->disable_all)
1091         {
1092             unsigned int i;
1093             /* count modified privs */
1094             for (i = 0; i < priv_count; i++)
1095             {
1096                 struct privilege *privilege =
1097                     token_find_privilege( token, &privs[i].Luid, FALSE );
1098                 if (privilege && req->get_modified_state)
1099                     modified_priv_count++;
1100             }
1101             reply->len = modified_priv_count;
1102             modified_priv_count = min( modified_priv_count, get_reply_max_size() / sizeof(*modified_privs) );
1103             if (modified_priv_count)
1104                 modified_privs = set_reply_data_size( modified_priv_count * sizeof(*modified_privs) );
1105         }
1106         reply->len = modified_priv_count * sizeof(*modified_privs);
1107
1108         if (req->disable_all)
1109             token_disable_privileges( token );
1110         else
1111             modified_priv_count = token_adjust_privileges( token, privs,
1112                 priv_count, modified_privs, modified_priv_count );
1113
1114         release_object( token );
1115     }
1116 }
1117
1118 /* retrieves the list of privileges that may be held be the token */
1119 DECL_HANDLER(get_token_privileges)
1120 {
1121     struct token *token;
1122
1123     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1124                                                  TOKEN_QUERY,
1125                                                  &token_ops )))
1126     {
1127         int priv_count = 0;
1128         LUID_AND_ATTRIBUTES *privs;
1129         struct privilege *privilege;
1130
1131         LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
1132             priv_count++;
1133
1134         reply->len = priv_count * sizeof(*privs);
1135         if (reply->len <= get_reply_max_size())
1136         {
1137             privs = set_reply_data_size( priv_count * sizeof(*privs) );
1138             if (privs)
1139             {
1140                 int i = 0;
1141                 LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
1142                 {
1143                     luid_and_attr_from_privilege( &privs[i], privilege );
1144                     i++;
1145                 }
1146             }
1147         }
1148         else
1149             set_error(STATUS_BUFFER_TOO_SMALL);
1150
1151         release_object( token );
1152     }
1153 }
1154
1155 /* creates a duplicate of the token */
1156 DECL_HANDLER(duplicate_token)
1157 {
1158     struct token *src_token;
1159
1160     if ((req->impersonation_level < SecurityAnonymous) ||
1161         (req->impersonation_level > SecurityDelegation))
1162     {
1163         set_error( STATUS_BAD_IMPERSONATION_LEVEL );
1164         return;
1165     }
1166
1167     if ((src_token = (struct token *)get_handle_obj( current->process, req->handle,
1168                                                      TOKEN_DUPLICATE,
1169                                                      &token_ops )))
1170     {
1171         const LUID *modified_id =
1172             req->primary || (req->impersonation_level == src_token->impersonation_level) ?
1173                 &src_token->modified_id : NULL;
1174         struct token *token = NULL;
1175
1176         if (req->primary || (req->impersonation_level <= src_token->impersonation_level))
1177             token = create_token( req->primary, src_token->user, NULL, 0,
1178                                   NULL, 0, src_token->default_dacl,
1179                                   src_token->source, modified_id,
1180                                   req->impersonation_level );
1181         else set_error( STATUS_BAD_IMPERSONATION_LEVEL );
1182
1183         if (token)
1184         {
1185             struct privilege *privilege;
1186             struct group *group;
1187             unsigned int access;
1188
1189             /* copy groups */
1190             LIST_FOR_EACH_ENTRY( group, &src_token->groups, struct group, entry )
1191             {
1192                 size_t size = FIELD_OFFSET( struct group, sid.SubAuthority[group->sid.SubAuthorityCount] );
1193                 struct group *newgroup = mem_alloc( size );
1194                 if (!newgroup)
1195                 {
1196                     release_object( token );
1197                     release_object( src_token );
1198                     return;
1199                 }
1200                 memcpy( newgroup, group, size );
1201                 list_add_tail( &token->groups, &newgroup->entry );
1202             }
1203             token->primary_group = src_token->primary_group;
1204             assert( token->primary_group );
1205
1206             /* copy privileges */
1207             LIST_FOR_EACH_ENTRY( privilege, &src_token->privileges, struct privilege, entry )
1208                 privilege_add( token, &privilege->luid, privilege->enabled );
1209
1210             access = req->access;
1211             if (access & MAXIMUM_ALLOWED) access = TOKEN_ALL_ACCESS; /* FIXME: needs general solution */
1212             reply->new_handle = alloc_handle( current->process, token, access, req->attributes);
1213             release_object( token );
1214         }
1215         release_object( src_token );
1216     }
1217 }
1218
1219 /* checks the specified privileges are held by the token */
1220 DECL_HANDLER(check_token_privileges)
1221 {
1222     struct token *token;
1223
1224     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1225                                                  TOKEN_QUERY,
1226                                                  &token_ops )))
1227     {
1228         unsigned int count = get_req_data_size() / sizeof(LUID_AND_ATTRIBUTES);
1229
1230         if (!token->primary && token->impersonation_level <= SecurityAnonymous)
1231             set_error( STATUS_BAD_IMPERSONATION_LEVEL );
1232         else if (get_reply_max_size() >= count * sizeof(LUID_AND_ATTRIBUTES))
1233         {
1234             LUID_AND_ATTRIBUTES *usedprivs = set_reply_data_size( count * sizeof(*usedprivs) );
1235             reply->has_privileges = token_check_privileges( token, req->all_required, get_req_data(), count, usedprivs );
1236         }
1237         else
1238             set_error( STATUS_BUFFER_OVERFLOW );
1239         release_object( token );
1240     }
1241 }
1242
1243 /* checks that a user represented by a token is allowed to access an object
1244  * represented by a security descriptor */
1245 DECL_HANDLER(access_check)
1246 {
1247     data_size_t sd_size = get_req_data_size();
1248     const struct security_descriptor *sd = get_req_data();
1249     struct token *token;
1250
1251     if (!sd_is_valid( sd, sd_size ))
1252     {
1253         set_error( STATUS_ACCESS_VIOLATION );
1254         return;
1255     }
1256
1257     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1258                                                  TOKEN_QUERY,
1259                                                  &token_ops )))
1260     {
1261         GENERIC_MAPPING mapping;
1262         unsigned int status;
1263         LUID_AND_ATTRIBUTES priv;
1264         unsigned int priv_count = 1;
1265
1266         memset(&priv, 0, sizeof(priv));
1267
1268         /* only impersonation tokens may be used with this function */
1269         if (token->primary)
1270         {
1271             set_error( STATUS_NO_IMPERSONATION_TOKEN );
1272             release_object( token );
1273             return;
1274         }
1275         /* anonymous impersonation tokens can't be used */
1276         if (token->impersonation_level <= SecurityAnonymous)
1277         {
1278             set_error( STATUS_BAD_IMPERSONATION_LEVEL );
1279             release_object( token );
1280             return;
1281         }
1282
1283         mapping.GenericRead = req->mapping_read;
1284         mapping.GenericWrite = req->mapping_write;
1285         mapping.GenericExecute = req->mapping_execute;
1286         mapping.GenericAll = req->mapping_all;
1287
1288         status = token_access_check(
1289             token, sd, req->desired_access, &priv, &priv_count, &mapping,
1290             &reply->access_granted, &reply->access_status );
1291
1292         reply->privileges_len = priv_count*sizeof(LUID_AND_ATTRIBUTES);
1293
1294         if ((priv_count > 0) && (reply->privileges_len <= get_reply_max_size()))
1295         {
1296             LUID_AND_ATTRIBUTES *privs = set_reply_data_size( priv_count * sizeof(*privs) );
1297             memcpy( privs, &priv, sizeof(priv) );
1298         }
1299
1300         set_error( status );
1301         release_object( token );
1302     }
1303 }
1304
1305 /* retrieves the SID of the user that the token represents */
1306 DECL_HANDLER(get_token_user)
1307 {
1308     struct token *token;
1309
1310     reply->user_len = 0;
1311
1312     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1313                                                  TOKEN_QUERY,
1314                                                  &token_ops )))
1315     {
1316         const SID *user = token->user;
1317
1318         reply->user_len = FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
1319         if (reply->user_len <= get_reply_max_size())
1320         {
1321             SID *user_reply = set_reply_data_size( reply->user_len );
1322             if (user_reply)
1323                 memcpy( user_reply, user, reply->user_len );
1324         }
1325         else set_error( STATUS_BUFFER_TOO_SMALL );
1326
1327         release_object( token );
1328     }
1329 }
1330
1331 /* retrieves the groups that the user represented by the token belongs to */
1332 DECL_HANDLER(get_token_groups)
1333 {
1334     struct token *token;
1335
1336     reply->user_len = 0;
1337
1338     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1339                                                  TOKEN_QUERY,
1340                                                  &token_ops )))
1341     {
1342         size_t size_needed = sizeof(struct token_groups);
1343         unsigned int group_count = 0;
1344         const struct group *group;
1345
1346         LIST_FOR_EACH_ENTRY( group, &token->groups, const struct group, entry )
1347         {
1348             group_count++;
1349             size_needed += FIELD_OFFSET(SID, SubAuthority[group->sid.SubAuthorityCount]);
1350         }
1351         size_needed += sizeof(unsigned int) * group_count;
1352
1353         reply->user_len = size_needed;
1354
1355         if (size_needed <= get_reply_max_size())
1356         {
1357             struct token_groups *tg = set_reply_data_size( size_needed );
1358             if (tg)
1359             {
1360                 unsigned int *attr_ptr = (unsigned int *)(tg + 1);
1361                 SID *sid_ptr = (SID *)(attr_ptr + group_count);
1362
1363                 tg->count = group_count;
1364
1365                 LIST_FOR_EACH_ENTRY( group, &token->groups, const struct group, entry )
1366                 {
1367
1368                     *attr_ptr = 0;
1369                     if (group->mandatory) *attr_ptr |= SE_GROUP_MANDATORY;
1370                     if (group->def) *attr_ptr |= SE_GROUP_ENABLED_BY_DEFAULT;
1371                     if (group->enabled) *attr_ptr |= SE_GROUP_ENABLED;
1372                     if (group->owner) *attr_ptr |= SE_GROUP_OWNER;
1373                     if (group->deny_only) *attr_ptr |= SE_GROUP_USE_FOR_DENY_ONLY;
1374                     if (group->resource) *attr_ptr |= SE_GROUP_RESOURCE;
1375
1376                     memcpy(sid_ptr, &group->sid, FIELD_OFFSET(SID, SubAuthority[group->sid.SubAuthorityCount]));
1377
1378                     sid_ptr = (SID *)((char *)sid_ptr + FIELD_OFFSET(SID, SubAuthority[group->sid.SubAuthorityCount]));
1379                     attr_ptr++;
1380                 }
1381             }
1382         }
1383         else set_error( STATUS_BUFFER_TOO_SMALL );
1384
1385         release_object( token );
1386     }
1387 }
1388
1389 DECL_HANDLER(set_security_object)
1390 {
1391     data_size_t sd_size = get_req_data_size();
1392     const struct security_descriptor *sd = get_req_data();
1393     struct object *obj;
1394     unsigned int access = 0;
1395
1396     if (!sd_is_valid( sd, sd_size ))
1397     {
1398         set_error( STATUS_ACCESS_VIOLATION );
1399         return;
1400     }
1401
1402     if (req->security_info & OWNER_SECURITY_INFORMATION ||
1403         req->security_info & GROUP_SECURITY_INFORMATION)
1404         access |= WRITE_OWNER;
1405     if (req->security_info & SACL_SECURITY_INFORMATION)
1406         access |= ACCESS_SYSTEM_SECURITY;
1407     if (req->security_info & DACL_SECURITY_INFORMATION)
1408         access |= WRITE_DAC;
1409
1410     if (!(obj = get_handle_obj( current->process, req->handle, access, NULL ))) return;
1411
1412     set_object_sd( obj, sd, req->security_info );
1413     release_object( obj );
1414 }