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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include "config.h"
  24
  25 #include <assert.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28
  29 #include "windef.h"
  30
  31 #include "handle.h"
  32 #include "thread.h"
  33 #include "process.h"
  34 #include "request.h"
  35 #include "security.h"
  36
  37 #include "wine/unicode.h"
  38
  39 #define MAX_SUBAUTH_COUNT 1
  40
  41 const LUID SeIncreaseQuotaPrivilege        = {  5, 0 };
  42 const LUID SeSecurityPrivilege             = {  8, 0 };
  43 const LUID SeTakeOwnershipPrivilege        = {  9, 0 };
  44 const LUID SeLoadDriverPrivilege           = { 10, 0 };
  45 const LUID SeSystemProfilePrivilege        = { 11, 0 };
  46 const LUID SeSystemtimePrivilege           = { 12, 0 };
  47 const LUID SeProfileSingleProcessPrivilege = { 13, 0 };
  48 const LUID SeIncreaseBasePriorityPrivilege = { 14, 0 };
  49 const LUID SeCreatePagefilePrivilege       = { 15, 0 };
  50 const LUID SeBackupPrivilege               = { 17, 0 };
  51 const LUID SeRestorePrivilege              = { 18, 0 };
  52 const LUID SeShutdownPrivilege             = { 19, 0 };
  53 const LUID SeDebugPrivilege                = { 20, 0 };
  54 const LUID SeSystemEnvironmentPrivilege    = { 22, 0 };
  55 const LUID SeChangeNotifyPrivilege         = { 23, 0 };
  56 const LUID SeRemoteShutdownPrivilege       = { 24, 0 };
  57 const LUID SeUndockPrivilege               = { 25, 0 };
  58 const LUID SeManageVolumePrivilege         = { 28, 0 };
  59 const LUID SeImpersonatePrivilege          = { 29, 0 };
  60 const LUID SeCreateGlobalPrivilege         = { 30, 0 };
  61
  62 static const SID world_sid = { SID_REVISION, 1, { SECURITY_WORLD_SID_AUTHORITY }, { SECURITY_WORLD_RID } };
  63 static const SID local_sid = { SID_REVISION, 1, { SECURITY_LOCAL_SID_AUTHORITY }, { SECURITY_LOCAL_RID } };
  64 static const SID interactive_sid = { SID_REVISION, 1, { SECURITY_NT_AUTHORITY }, { SECURITY_INTERACTIVE_RID } };
  65 static const SID authenticated_user_sid = { SID_REVISION, 1, { SECURITY_NT_AUTHORITY }, { SECURITY_AUTHENTICATED_USER_RID } };
  66 static const SID local_system_sid = { SID_REVISION, 1, { SECURITY_NT_AUTHORITY }, { SECURITY_LOCAL_SYSTEM_RID } };
  67 static const PSID security_world_sid = (PSID)&world_sid;
  68 static const PSID security_local_sid = (PSID)&local_sid;
  69 const PSID security_interactive_sid = (PSID)&interactive_sid;
  70 static const PSID security_authenticated_user_sid = (PSID)&authenticated_user_sid;
  71 static const PSID security_local_system_sid = (PSID)&local_system_sid;
  72
  73 struct token
  74 {
  75     struct object  obj;             /* object header */
  76     struct list    privileges;      /* privileges available to the token */
  77     struct list    groups;          /* groups that the user of this token belongs to (sid_and_attributes) */
  78     SID           *user;            /* SID of user this token represents */
  79     unsigned       primary;         /* is this a primary or impersonation token? */
  80     ACL           *default_dacl;    /* the default DACL to assign to objects created by this user */
  81 };
  82
  83 struct privilege
  84 {
  85     struct list entry;
  86     LUID        luid;
  87     unsigned    enabled  : 1; /* is the privilege currently enabled? */
  88     unsigned    def      : 1; /* is the privilege enabled by default? */
  89 };
  90
  91 struct sid_and_attributes
  92 {
  93     struct list entry;
  94     unsigned    enabled  : 1; /* is the sid currently enabled? */
  95     unsigned    def      : 1; /* is the sid enabled by default? */
  96     unsigned    logon    : 1; /* is this a logon sid? */
  97     unsigned    mandatory: 1; /* is this sid always enabled? */
  98     unsigned    owner    : 1; /* can this sid be an owner of an object? */
  99     unsigned    resource : 1; /* is this a domain-local group? */
 100     unsigned    deny_only: 1; /* is this a sid that should be use for denying only? */
 101     SID         sid;
 102 };
 103
 104 static void token_dump( struct object *obj, int verbose );
 105 static void token_destroy( struct object *obj );
 106
 107 static const struct object_ops token_ops =
 108 {
 109     sizeof(struct token),      /* size */
 110     token_dump,                /* dump */
 111     no_add_queue,              /* add_queue */
 112     NULL,                      /* remove_queue */
 113     NULL,                      /* signaled */
 114     NULL,                      /* satisfied */
 115     no_signal,                 /* signal */
 116     no_get_fd,                 /* get_fd */
 117     no_close_handle,           /* close_handle */
 118     token_destroy              /* destroy */
 119 };
 120
 121
 122 static void token_dump( struct object *obj, int verbose )
 123 {
 124     fprintf( stderr, "Security token\n" );
 125     /* FIXME: dump token members */
 126 }
 127
 128 static SID *security_sid_alloc( const SID_IDENTIFIER_AUTHORITY *idauthority, int subauthcount, const unsigned int subauth[] )
 129 {
 130     int i;
 131     SID *sid = mem_alloc( FIELD_OFFSET(SID, SubAuthority[subauthcount]) );
 132     if (!sid) return NULL;
 133     sid->Revision = SID_REVISION;
 134     sid->SubAuthorityCount = subauthcount;
 135     sid->IdentifierAuthority = *idauthority;
 136     for (i = 0; i < subauthcount; i++)
 137         sid->SubAuthority[i] = subauth[i];
 138     return sid;
 139 }
 140
 141 static inline int security_equal_sid( const SID *sid1, const SID *sid2 )
 142 {
 143     return ((sid1->SubAuthorityCount == sid2->SubAuthorityCount) &&
 144         !memcmp( sid1, sid2, FIELD_OFFSET(SID, SubAuthority[sid1->SubAuthorityCount]) ));
 145 }
 146
 147 void security_set_thread_token( struct thread *thread, obj_handle_t handle )
 148 {
 149     if (!handle)
 150     {
 151         if (thread->token)
 152             release_object( thread->token );
 153         thread->token = NULL;
 154     }
 155     else
 156     {
 157         struct token *token = (struct token *)get_handle_obj( current->process,
 158                                                               handle,
 159                                                               TOKEN_IMPERSONATE,
 160                                                               &token_ops );
 161         if (token)
 162         {
 163             if (thread->token)
 164                 release_object( thread->token );
 165             thread->token = token;
 166         }
 167     }
 168 }
 169
 170 static const ACE_HEADER *ace_next( const ACE_HEADER *ace )
 171 {
 172     return (const ACE_HEADER *)((const char *)ace + ace->AceSize);
 173 }
 174
 175 static int acl_is_valid( const ACL *acl, size_t size )
 176 {
 177     ULONG i;
 178     const ACE_HEADER *ace;
 179
 180     if (size < sizeof(ACL))
 181         return FALSE;
 182
 183     size = min(size, MAX_ACL_LEN);
 184
 185     size -= sizeof(ACL);
 186
 187     ace = (const ACE_HEADER *)(acl + 1);
 188     for (i = 0; i < acl->AceCount; i++)
 189     {
 190         const SID *sid;
 191         size_t sid_size;
 192
 193         if (size < sizeof(ACE_HEADER))
 194             return FALSE;
 195         if (size < ace->AceSize)
 196             return FALSE;
 197         size -= ace->AceSize;
 198         switch (ace->AceType)
 199         {
 200         case ACCESS_DENIED_ACE_TYPE:
 201             sid = (const SID *)&((const ACCESS_DENIED_ACE *)ace)->SidStart;
 202             sid_size = ace->AceSize - FIELD_OFFSET(ACCESS_DENIED_ACE, SidStart);
 203             break;
 204         case ACCESS_ALLOWED_ACE_TYPE:
 205             sid = (const SID *)&((const ACCESS_ALLOWED_ACE *)ace)->SidStart;
 206             sid_size = ace->AceSize - FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart);
 207             break;
 208         case SYSTEM_AUDIT_ACE_TYPE:
 209             sid = (const SID *)&((const SYSTEM_AUDIT_ACE *)ace)->SidStart;
 210             sid_size = ace->AceSize - FIELD_OFFSET(SYSTEM_AUDIT_ACE, SidStart);
 211             break;
 212         case SYSTEM_ALARM_ACE_TYPE:
 213             sid = (const SID *)&((const SYSTEM_ALARM_ACE *)ace)->SidStart;
 214             sid_size = ace->AceSize - FIELD_OFFSET(SYSTEM_ALARM_ACE, SidStart);
 215             break;
 216         default:
 217             return FALSE;
 218         }
 219         if (sid_size < FIELD_OFFSET(SID, SubAuthority[0]) ||
 220             sid_size < FIELD_OFFSET(SID, SubAuthority[sid->SubAuthorityCount]))
 221             return FALSE;
 222         ace = ace_next( ace );
 223     }
 224     return TRUE;
 225 }
 226
 227 /* gets the discretionary access control list from a security descriptor */
 228 static inline const ACL *sd_get_dacl( const struct security_descriptor *sd, int *present )
 229 {
 230     *present = (sd->control & SE_DACL_PRESENT ? TRUE : FALSE);
 231
 232     if (sd->dacl_len)
 233         return (const ACL *)((const char *)(sd + 1) +
 234             sd->owner_len + sd->group_len + sd->sacl_len);
 235     else
 236         return NULL;
 237 }
 238
 239 /* gets the system access control list from a security descriptor */
 240 static inline const ACL *sd_get_sacl( const struct security_descriptor *sd, int *present )
 241 {
 242     *present = (sd->control & SE_SACL_PRESENT ? TRUE : FALSE);
 243
 244     if (sd->sacl_len)
 245         return (const ACL *)((const char *)(sd + 1) +
 246             sd->owner_len + sd->group_len);
 247     else
 248         return NULL;
 249 }
 250
 251 /* gets the owner from a security descriptor */
 252 static inline const SID *sd_get_owner( const struct security_descriptor *sd )
 253 {
 254     if (sd->owner_len)
 255         return (const SID *)(sd + 1);
 256     else
 257         return NULL;
 258 }
 259
 260 /* gets the primary group from a security descriptor */
 261 static inline const SID *sd_get_group( const struct security_descriptor *sd )
 262 {
 263     if (sd->group_len)
 264         return (const SID *)((const char *)(sd + 1) + sd->owner_len);
 265     else
 266         return NULL;
 267 }
 268
 269 /* checks whether all members of a security descriptor fit inside the size
 270  * of memory specified */
 271 static int sd_is_valid( const struct security_descriptor *sd, size_t size )
 272 {
 273     size_t offset = sizeof(struct security_descriptor);
 274     const SID *group;
 275     const SID *owner;
 276     const ACL *sacl;
 277     const ACL *dacl;
 278     int dummy;
 279
 280     if (size < offset)
 281         return FALSE;
 282
 283     if ((sd->owner_len >= FIELD_OFFSET(SID, SubAuthority[255])) ||
 284         (offset + sd->owner_len > size))
 285         return FALSE;
 286     owner = sd_get_owner( sd );
 287     if (owner)
 288     {
 289         size_t needed_size = FIELD_OFFSET(SID, SubAuthority[owner->SubAuthorityCount]);
 290         if ((sd->owner_len < sizeof(SID)) || (needed_size > sd->owner_len))
 291             return FALSE;
 292     }
 293     offset += sd->owner_len;
 294
 295     if ((sd->group_len >= FIELD_OFFSET(SID, SubAuthority[255])) ||
 296         (offset + sd->group_len > size))
 297         return FALSE;
 298     group = sd_get_group( sd );
 299     if (group)
 300     {
 301         size_t needed_size = FIELD_OFFSET(SID, SubAuthority[group->SubAuthorityCount]);
 302         if ((sd->owner_len < sizeof(SID)) || (needed_size > sd->owner_len))
 303             return FALSE;
 304     }
 305     offset += sd->group_len;
 306
 307     if ((sd->sacl_len >= MAX_ACL_LEN) || (offset + sd->sacl_len > size))
 308         return FALSE;
 309     sacl = sd_get_sacl( sd, &dummy );
 310     if (sacl && !acl_is_valid( sacl, sd->sacl_len ))
 311         return FALSE;
 312     offset += sd->sacl_len;
 313
 314     if ((sd->dacl_len >= MAX_ACL_LEN) || (offset + sd->dacl_len > size))
 315         return FALSE;
 316     dacl = sd_get_dacl( sd, &dummy );
 317     if (dacl && !acl_is_valid( dacl, sd->dacl_len ))
 318         return FALSE;
 319     offset += sd->dacl_len;
 320
 321     return TRUE;
 322 }
 323
 324 /* maps from generic rights to specific rights as given by a mapping */
 325 static inline void map_generic_mask(unsigned int *mask, const GENERIC_MAPPING *mapping)
 326 {
 327     if (*mask & GENERIC_READ) *mask |= mapping->GenericRead;
 328     if (*mask & GENERIC_WRITE) *mask |= mapping->GenericWrite;
 329     if (*mask & GENERIC_EXECUTE) *mask |= mapping->GenericExecute;
 330     if (*mask & GENERIC_ALL) *mask |= mapping->GenericAll;
 331     *mask &= 0x0FFFFFFF;
 332 }
 333
 334 static inline int is_equal_luid( const LUID *luid1, const LUID *luid2 )
 335 {
 336     return (luid1->LowPart == luid2->LowPart && luid1->HighPart == luid2->HighPart);
 337 }
 338
 339 static inline void luid_and_attr_from_privilege( LUID_AND_ATTRIBUTES *out, const struct privilege *in)
 340 {
 341     out->Luid = in->luid;
 342     out->Attributes =
 343         (in->enabled ? SE_PRIVILEGE_ENABLED : 0) |
 344         (in->def ? SE_PRIVILEGE_ENABLED_BY_DEFAULT : 0);
 345 }
 346
 347 static struct privilege *privilege_add( struct token *token, const LUID *luid, int enabled )
 348 {
 349     struct privilege *privilege = mem_alloc( sizeof(*privilege) );
 350     if (privilege)
 351     {
 352         privilege->luid = *luid;
 353         privilege->def = privilege->enabled = (enabled != 0);
 354         list_add_tail( &token->privileges, &privilege->entry );
 355     }
 356     return privilege;
 357 }
 358
 359 static inline void privilege_remove( struct privilege *privilege )
 360 {
 361     list_remove( &privilege->entry );
 362     free( privilege );
 363 }
 364
 365 static void token_destroy( struct object *obj )
 366 {
 367     struct token* token;
 368     struct list *cursor, *cursor_next;
 369
 370     assert( obj->ops == &token_ops );
 371     token = (struct token *)obj;
 372
 373     free( token->user );
 374
 375     LIST_FOR_EACH_SAFE( cursor, cursor_next, &token->privileges )
 376     {
 377         struct privilege *privilege = LIST_ENTRY( cursor, struct privilege, entry );
 378         privilege_remove( privilege );
 379     }
 380
 381     LIST_FOR_EACH_SAFE( cursor, cursor_next, &token->groups )
 382     {
 383         struct sid_and_attributes *group = LIST_ENTRY( cursor, struct sid_and_attributes, entry );
 384         list_remove( &group->entry );
 385         free( group );
 386     }
 387
 388     free( token->default_dacl );
 389 }
 390
 391 /* creates a new token.
 392  *  groups may be NULL if group_count is 0.
 393  *  privs may be NULL if priv_count is 0.
 394  *  default_dacl may be NULL, indicating that all objects created by the user
 395  *   are unsecured.
 396  */
 397 static struct token *create_token( unsigned primary, const SID *user,
 398                                    const SID_AND_ATTRIBUTES *groups, unsigned int group_count,
 399                                    const LUID_AND_ATTRIBUTES *privs, unsigned int priv_count,
 400                                    const ACL *default_dacl )
 401 {
 402     struct token *token = alloc_object( &token_ops );
 403     if (token)
 404     {
 405         int i;
 406
 407         list_init( &token->privileges );
 408         list_init( &token->groups );
 409         token->primary = primary;
 410
 411         /* copy user */
 412         token->user = memdup( user, FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) );
 413         if (!token->user)
 414         {
 415             release_object( token );
 416             return NULL;
 417         }
 418
 419         /* copy groups */
 420         for (i = 0; i < group_count; i++)
 421         {
 422             size_t size = FIELD_OFFSET( struct sid_and_attributes, sid.SubAuthority[((const SID *)groups[i].Sid)->SubAuthorityCount] );
 423             struct sid_and_attributes *group = mem_alloc( size );
 424             memcpy( &group->sid, groups[i].Sid, FIELD_OFFSET( SID, SubAuthority[((const SID *)groups[i].Sid)->SubAuthorityCount] ) );
 425             group->enabled = TRUE;
 426             group->def = TRUE;
 427             group->logon = FALSE;
 428             group->mandatory = (groups[i].Attributes & SE_GROUP_MANDATORY) ? TRUE : FALSE;
 429             group->owner = FALSE;
 430             group->resource = FALSE;
 431             group->deny_only = FALSE;
 432             list_add_tail( &token->groups, &group->entry );
 433         }
 434
 435         /* copy privileges */
 436         for (i = 0; i < priv_count; i++)
 437         {
 438             /* note: we don't check uniqueness: the caller must make sure
 439              * privs doesn't contain any duplicate luids */
 440             if (!privilege_add( token, &privs[i].Luid,
 441                                 privs[i].Attributes & SE_PRIVILEGE_ENABLED ))
 442             {
 443                 release_object( token );
 444                 return NULL;
 445             }
 446         }
 447
 448         if (default_dacl)
 449         {
 450             token->default_dacl = memdup( default_dacl, default_dacl->AclSize );
 451             if (!token->default_dacl)
 452             {
 453                 release_object( token );
 454                 return NULL;
 455             }
 456         }
 457         else
 458             token->default_dacl = NULL;
 459     }
 460     return token;
 461 }
 462
 463 static ACL *create_default_dacl( const SID *user )
 464 {
 465     ACCESS_ALLOWED_ACE *aaa;
 466     ACL *default_dacl;
 467     SID *sid;
 468     size_t default_dacl_size = sizeof(ACL) +
 469                                2*(sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD)) +
 470                                sizeof(local_system_sid) +
 471                                FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
 472
 473     default_dacl = mem_alloc( default_dacl_size );
 474     if (!default_dacl) return NULL;
 475
 476     default_dacl->AclRevision = MAX_ACL_REVISION;
 477     default_dacl->Sbz1 = 0;
 478     default_dacl->AclSize = default_dacl_size;
 479     default_dacl->AceCount = 2;
 480     default_dacl->Sbz2 = 0;
 481
 482     /* GENERIC_ALL for Local System */
 483     aaa = (ACCESS_ALLOWED_ACE *)(default_dacl + 1);
 484     aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 485     aaa->Header.AceFlags = 0;
 486     aaa->Header.AceSize = (sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD)) +
 487                           sizeof(local_system_sid);
 488     aaa->Mask = GENERIC_ALL;
 489     sid = (SID *)&aaa->SidStart;
 490     memcpy( sid, &local_system_sid, sizeof(local_system_sid) );
 491
 492     /* GENERIC_ALL for specified user */
 493     aaa = (ACCESS_ALLOWED_ACE *)((const char *)aaa + aaa->Header.AceSize);
 494     aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 495     aaa->Header.AceFlags = 0;
 496     aaa->Header.AceSize = (sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD)) +
 497                           FIELD_OFFSET( SID, SubAuthority[user->SubAuthorityCount] );
 498     aaa->Mask = GENERIC_ALL;
 499     sid = (SID *)&aaa->SidStart;
 500     memcpy( sid, user, FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) );
 501
 502     return default_dacl;
 503 }
 504
 505 struct sid_data
 506 {
 507     SID_IDENTIFIER_AUTHORITY idauth;
 508     int count;
 509     unsigned int subauth[MAX_SUBAUTH_COUNT];
 510 };
 511
 512 struct token *token_create_admin( void )
 513 {
 514     struct token *token = NULL;
 515     static const SID_IDENTIFIER_AUTHORITY nt_authority = { SECURITY_NT_AUTHORITY };
 516     static const unsigned int alias_admins_subauth[] = { SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS };
 517     static const unsigned int alias_users_subauth[] = { SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_USERS };
 518     PSID alias_admins_sid;
 519     PSID alias_users_sid;
 520     ACL *default_dacl = create_default_dacl( &local_system_sid );
 521
 522     alias_admins_sid = security_sid_alloc( &nt_authority, sizeof(alias_admins_subauth)/sizeof(alias_admins_subauth[0]),
 523                                            alias_admins_subauth );
 524     alias_users_sid = security_sid_alloc( &nt_authority, sizeof(alias_users_subauth)/sizeof(alias_users_subauth[0]),
 525                                           alias_users_subauth );
 526
 527     if (alias_admins_sid && alias_users_sid && default_dacl)
 528     {
 529         const LUID_AND_ATTRIBUTES admin_privs[] =
 530         {
 531             { SeChangeNotifyPrivilege        , SE_PRIVILEGE_ENABLED },
 532             { SeSecurityPrivilege            , 0                    },
 533             { SeBackupPrivilege              , 0                    },
 534             { SeRestorePrivilege             , 0                    },
 535             { SeSystemtimePrivilege          , 0                    },
 536             { SeShutdownPrivilege            , 0                    },
 537             { SeRemoteShutdownPrivilege      , 0                    },
 538             { SeTakeOwnershipPrivilege       , 0                    },
 539             { SeDebugPrivilege               , 0                    },
 540             { SeSystemEnvironmentPrivilege   , 0                    },
 541             { SeSystemProfilePrivilege       , 0                    },
 542             { SeProfileSingleProcessPrivilege, 0                    },
 543             { SeIncreaseBasePriorityPrivilege, 0                    },
 544             { SeLoadDriverPrivilege          , 0                    },
 545             { SeCreatePagefilePrivilege      , 0                    },
 546             { SeIncreaseQuotaPrivilege       , 0                    },
 547             { SeUndockPrivilege              , 0                    },
 548             { SeManageVolumePrivilege        , 0                    },
 549             { SeImpersonatePrivilege         , SE_PRIVILEGE_ENABLED },
 550             { SeCreateGlobalPrivilege        , SE_PRIVILEGE_ENABLED },
 551         };
 552         /* note: we don't include non-builtin groups here for the user -
 553          * telling us these is the job of a client-side program */
 554         const SID_AND_ATTRIBUTES admin_groups[] =
 555         {
 556             { security_world_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
 557             { security_local_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
 558             { security_interactive_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
 559             { security_authenticated_user_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
 560             { alias_admins_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
 561             { alias_users_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
 562         };
 563         /* note: we just set the user sid to be the interactive builtin sid -
 564          * we should really translate the UNIX user id to a sid */
 565         token = create_token( TRUE, &interactive_sid,
 566                             admin_groups, sizeof(admin_groups)/sizeof(admin_groups[0]),
 567                             admin_privs, sizeof(admin_privs)/sizeof(admin_privs[0]),
 568                             default_dacl );
 569     }
 570
 571     if (alias_admins_sid)
 572         free( alias_admins_sid );
 573     if (alias_users_sid)
 574         free( alias_users_sid );
 575     if (default_dacl)
 576         free( default_dacl );
 577
 578     return token;
 579 }
 580
 581 static struct privilege *token_find_privilege( struct token *token, const LUID *luid, int enabled_only )
 582 {
 583     struct privilege *privilege;
 584     LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
 585     {
 586         if (is_equal_luid( luid, &privilege->luid ))
 587         {
 588             if (enabled_only && !privilege->enabled)
 589                 return NULL;
 590             return privilege;
 591         }
 592     }
 593     return NULL;
 594 }
 595
 596 static unsigned int token_adjust_privileges( struct token *token, const LUID_AND_ATTRIBUTES *privs,
 597                                              unsigned int count, LUID_AND_ATTRIBUTES *mod_privs,
 598                                              unsigned int mod_privs_count )
 599 {
 600     int i;
 601     unsigned int modified_count = 0;
 602
 603     for (i = 0; i < count; i++)
 604     {
 605         struct privilege *privilege =
 606             token_find_privilege( token, &privs[i].Luid, FALSE );
 607         if (!privilege)
 608         {
 609             set_error( STATUS_NOT_ALL_ASSIGNED );
 610             continue;
 611         }
 612
 613         if (privs[i].Attributes & SE_PRIVILEGE_REMOVE)
 614             privilege_remove( privilege );
 615         else
 616         {
 617             /* save previous state for caller */
 618             if (mod_privs_count)
 619             {
 620                 luid_and_attr_from_privilege(mod_privs, privilege);
 621                 mod_privs++;
 622                 mod_privs_count--;
 623                 modified_count++;
 624             }
 625
 626             if (privs[i].Attributes & SE_PRIVILEGE_ENABLED)
 627                 privilege->enabled = TRUE;
 628             else
 629                 privilege->enabled = FALSE;
 630         }
 631     }
 632     return modified_count;
 633 }
 634
 635 static void token_disable_privileges( struct token *token )
 636 {
 637     struct privilege *privilege;
 638     LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
 639         privilege->enabled = FALSE;
 640 }
 641
 642 int token_check_privileges( struct token *token, int all_required,
 643                             const LUID_AND_ATTRIBUTES *reqprivs,
 644                             unsigned int count, LUID_AND_ATTRIBUTES *usedprivs)
 645 {
 646     int i;
 647     unsigned int enabled_count = 0;
 648
 649     for (i = 0; i < count; i++)
 650     {
 651         struct privilege *privilege =
 652             token_find_privilege( token, &reqprivs[i].Luid, TRUE );
 653
 654         if (usedprivs)
 655             usedprivs[i] = reqprivs[i];
 656
 657         if (privilege && privilege->enabled)
 658         {
 659             enabled_count++;
 660             if (usedprivs)
 661                 usedprivs[i].Attributes |= SE_PRIVILEGE_USED_FOR_ACCESS;
 662         }
 663     }
 664
 665     if (all_required)
 666         return (enabled_count == count);
 667     else
 668         return (enabled_count > 0);
 669 }
 670
 671 static int token_sid_present( struct token *token, const SID *sid, int deny )
 672 {
 673     struct sid_and_attributes *group;
 674
 675     if (security_equal_sid( token->user, sid )) return TRUE;
 676
 677     LIST_FOR_EACH_ENTRY( group, &token->groups, struct sid_and_attributes, entry )
 678     {
 679         if (!group->enabled) continue;
 680         if (group->deny_only && !deny) continue;
 681
 682         if (security_equal_sid( &group->sid, sid )) return TRUE;
 683     }
 684
 685     return FALSE;
 686 }
 687
 688 /* checks access to a security descriptor. sd must have been validated by caller.
 689  * it returns STATUS_SUCCESS if access was granted to the object, or an error
 690  * status code if not, giving the reason. errors not relating to giving access
 691  * to the object are returned in the status parameter. granted_access and
 692  * status always have a valid value stored in them on return. */
 693 static unsigned int token_access_check( struct token *token,
 694                                  const struct security_descriptor *sd,
 695                                  unsigned int desired_access,
 696                                  LUID_AND_ATTRIBUTES *privs,
 697                                  unsigned int *priv_count,
 698                                  const GENERIC_MAPPING *mapping,
 699                                  unsigned int *granted_access,
 700                                  unsigned int *status )
 701 {
 702     unsigned int current_access = 0;
 703     unsigned int denied_access = 0;
 704     ULONG i;
 705     const ACL *dacl;
 706     int dacl_present;
 707     const ACE_HEADER *ace;
 708     const SID *owner;
 709
 710     /* assume success, but no access rights */
 711     *status = STATUS_SUCCESS;
 712     *granted_access = 0;
 713
 714     /* fail if desired_access contains generic rights */
 715     if (desired_access & (GENERIC_READ|GENERIC_WRITE|GENERIC_EXECUTE|GENERIC_ALL))
 716     {
 717         *priv_count = 0;
 718         *status = STATUS_GENERIC_NOT_MAPPED;
 719         return STATUS_ACCESS_DENIED;
 720     }
 721
 722     dacl = sd_get_dacl( sd, &dacl_present );
 723     owner = sd_get_owner( sd );
 724     if (!owner || !sd_get_group( sd ))
 725     {
 726         *priv_count = 0;
 727         *status = STATUS_INVALID_SECURITY_DESCR;
 728         return STATUS_ACCESS_DENIED;
 729     }
 730
 731     /* 1: Grant desired access if the object is unprotected */
 732     if (!dacl_present)
 733     {
 734         *priv_count = 0;
 735         *granted_access = desired_access;
 736         return STATUS_SUCCESS;
 737     }
 738     if (!dacl)
 739     {
 740         *priv_count = 0;
 741         return STATUS_ACCESS_DENIED;
 742     }
 743
 744     /* 2: Check if caller wants access to system security part. Note: access
 745      * is only granted if specifically asked for */
 746     if (desired_access & ACCESS_SYSTEM_SECURITY)
 747     {
 748         const LUID_AND_ATTRIBUTES security_priv = { SeSecurityPrivilege, 0 };
 749         LUID_AND_ATTRIBUTES retpriv = security_priv;
 750         if (token_check_privileges( token, TRUE, &security_priv, 1, &retpriv ))
 751         {
 752             if (priv_count)
 753             {
 754                 /* assumes that there will only be one privilege to return */
 755                 if (*priv_count >= 1)
 756                 {
 757                     *priv_count = 1;
 758                     *privs = retpriv;
 759                 }
 760                 else
 761                 {
 762                     *priv_count = 1;
 763                     return STATUS_BUFFER_TOO_SMALL;
 764                 }
 765             }
 766             current_access |= ACCESS_SYSTEM_SECURITY;
 767             if (desired_access == current_access)
 768             {
 769                 *granted_access = current_access;
 770                 return STATUS_SUCCESS;
 771             }
 772         }
 773         else
 774         {
 775             *priv_count = 0;
 776             return STATUS_PRIVILEGE_NOT_HELD;
 777         }
 778     }
 779     else if (priv_count) *priv_count = 0;
 780
 781     /* 3: Check whether the token is the owner */
 782     /* NOTE: SeTakeOwnershipPrivilege is not checked for here - it is instead
 783      * checked when a "set owner" call is made, overriding the access rights
 784      * determined here. */
 785     if (token_sid_present( token, owner, FALSE ))
 786     {
 787         current_access |= (READ_CONTROL | WRITE_DAC);
 788         if (desired_access == current_access)
 789         {
 790             *granted_access = current_access;
 791             return STATUS_SUCCESS;
 792         }
 793     }
 794
 795     /* 4: Grant rights according to the DACL */
 796     ace = (const ACE_HEADER *)(dacl + 1);
 797     for (i = 0; i < dacl->AceCount; i++)
 798     {
 799         const ACCESS_ALLOWED_ACE *aa_ace;
 800         const ACCESS_DENIED_ACE *ad_ace;
 801         const SID *sid;
 802         switch (ace->AceType)
 803         {
 804         case ACCESS_DENIED_ACE_TYPE:
 805             ad_ace = (const ACCESS_DENIED_ACE *)ace;
 806             sid = (const SID *)&ad_ace->SidStart;
 807             if (token_sid_present( token, sid, TRUE ))
 808             {
 809                 unsigned int access = ad_ace->Mask;
 810                 map_generic_mask(&access, mapping);
 811                 if (desired_access & MAXIMUM_ALLOWED)
 812                     denied_access |= access;
 813                 else
 814                 {
 815                     denied_access |= (access & ~current_access);
 816                     if (desired_access & access)
 817                     {
 818                         *granted_access = 0;
 819                         return STATUS_SUCCESS;
 820                     }
 821                 }
 822             }
 823             break;
 824         case ACCESS_ALLOWED_ACE_TYPE:
 825             aa_ace = (const ACCESS_ALLOWED_ACE *)ace;
 826             sid = (const SID *)&aa_ace->SidStart;
 827             if (token_sid_present( token, sid, FALSE ))
 828             {
 829                 unsigned int access = aa_ace->Mask;
 830                 map_generic_mask(&access, mapping);
 831                 if (desired_access & MAXIMUM_ALLOWED)
 832                     current_access |= access;
 833                 else
 834                     current_access |= (access & ~denied_access);
 835             }
 836             break;
 837         }
 838
 839         /* don't bother carrying on checking if we've already got all of
 840             * rights we need */
 841         if (desired_access == *granted_access)
 842             break;
 843
 844         ace = ace_next( ace );
 845     }
 846
 847     if (desired_access & MAXIMUM_ALLOWED)
 848     {
 849         *granted_access = current_access & ~denied_access;
 850         if (*granted_access)
 851             return STATUS_SUCCESS;
 852         else
 853             return STATUS_ACCESS_DENIED;
 854     }
 855     else
 856     {
 857         if ((current_access & desired_access) == desired_access)
 858         {
 859             *granted_access = current_access & desired_access;
 860             return STATUS_SUCCESS;
 861         }
 862         else
 863             return STATUS_ACCESS_DENIED;
 864     }
 865 }
 866
 867 const ACL *token_get_default_dacl( struct token *token )
 868 {
 869     return token->default_dacl;
 870 }
 871
 872 /* open a security token */
 873 DECL_HANDLER(open_token)
 874 {
 875     if (req->flags & OPEN_TOKEN_THREAD)
 876     {
 877         struct thread *thread = get_thread_from_handle( req->handle, 0 );
 878         if (thread)
 879         {
 880             if (thread->token)
 881                 reply->token = alloc_handle( current->process, thread->token, TOKEN_ALL_ACCESS, 0);
 882             else
 883                 set_error(STATUS_NO_TOKEN);
 884             release_object( thread );
 885         }
 886     }
 887     else
 888     {
 889         struct process *process = get_process_from_handle( req->handle, 0 );
 890         if (process)
 891         {
 892             if (process->token)
 893                 reply->token = alloc_handle( current->process, process->token, TOKEN_ALL_ACCESS, 0);
 894             else
 895                 set_error(STATUS_NO_TOKEN);
 896             release_object( process );
 897         }
 898     }
 899 }
 900
 901 /* adjust the privileges held by a token */
 902 DECL_HANDLER(adjust_token_privileges)
 903 {
 904     struct token *token;
 905     unsigned int access = TOKEN_ADJUST_PRIVILEGES;
 906
 907     if (req->get_modified_state) access |= TOKEN_QUERY;
 908
 909     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
 910                                                  access, &token_ops )))
 911     {
 912         const LUID_AND_ATTRIBUTES *privs = get_req_data();
 913         LUID_AND_ATTRIBUTES *modified_privs = NULL;
 914         unsigned int priv_count = get_req_data_size() / sizeof(LUID_AND_ATTRIBUTES);
 915         unsigned int modified_priv_count = 0;
 916
 917         if (req->get_modified_state && !req->disable_all)
 918         {
 919             int i;
 920             /* count modified privs */
 921             for (i = 0; i < priv_count; i++)
 922             {
 923                 struct privilege *privilege =
 924                     token_find_privilege( token, &privs[i].Luid, FALSE );
 925                 if (privilege && req->get_modified_state)
 926                     modified_priv_count++;
 927             }
 928             reply->len = modified_priv_count;
 929             modified_priv_count = min( modified_priv_count, get_reply_max_size() / sizeof(*modified_privs) );
 930             if (modified_priv_count)
 931                 modified_privs = set_reply_data_size( modified_priv_count * sizeof(*modified_privs) );
 932         }
 933         reply->len = modified_priv_count * sizeof(*modified_privs);
 934
 935         if (req->disable_all)
 936             token_disable_privileges( token );
 937         else
 938             modified_priv_count = token_adjust_privileges( token, privs,
 939                 priv_count, modified_privs, modified_priv_count );
 940
 941         release_object( token );
 942     }
 943 }
 944
 945 /* retrieves the list of privileges that may be held be the token */
 946 DECL_HANDLER(get_token_privileges)
 947 {
 948     struct token *token;
 949
 950     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
 951                                                  TOKEN_QUERY,
 952                                                  &token_ops )))
 953     {
 954         int priv_count = 0;
 955         LUID_AND_ATTRIBUTES *privs;
 956         struct privilege *privilege;
 957
 958         LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
 959             priv_count++;
 960
 961         reply->len = priv_count * sizeof(*privs);
 962         if (reply->len <= get_reply_max_size())
 963         {
 964             privs = set_reply_data_size( priv_count * sizeof(*privs) );
 965             if (privs)
 966             {
 967                 int i = 0;
 968                 LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
 969                 {
 970                     luid_and_attr_from_privilege( &privs[i], privilege );
 971                     i++;
 972                 }
 973             }
 974         }
 975         else
 976             set_error(STATUS_BUFFER_TOO_SMALL);
 977
 978         release_object( token );
 979     }
 980 }
 981
 982 /* creates a duplicate of the token */
 983 DECL_HANDLER(duplicate_token)
 984 {
 985     struct token *src_token;
 986     if ((src_token = (struct token *)get_handle_obj( current->process, req->handle,
 987                                                      TOKEN_DUPLICATE,
 988                                                      &token_ops )))
 989     {
 990         /* FIXME: use req->impersonation_level */
 991         struct token *token = create_token( req->primary, src_token->user, NULL, 0, NULL, 0, src_token->default_dacl );
 992         if (token)
 993         {
 994             struct privilege *privilege;
 995             struct sid_and_attributes *group;
 996             unsigned int access;
 997
 998             /* copy groups */
 999             LIST_FOR_EACH_ENTRY( group, &src_token->groups, struct sid_and_attributes, entry )
1000             {
1001                 size_t size = FIELD_OFFSET( struct sid_and_attributes, sid.SubAuthority[group->sid.SubAuthorityCount] );
1002                 struct sid_and_attributes *newgroup = mem_alloc( size );
1003                 memcpy( newgroup, group, size );
1004                 list_add_tail( &token->groups, &newgroup->entry );
1005             }
1006
1007             /* copy privileges */
1008             LIST_FOR_EACH_ENTRY( privilege, &src_token->privileges, struct privilege, entry )
1009                 privilege_add( token, &privilege->luid, privilege->enabled );
1010
1011             access = req->access;
1012             if (access & MAXIMUM_ALLOWED) access = TOKEN_ALL_ACCESS; /* FIXME: needs general solution */
1013             reply->new_handle = alloc_handle( current->process, token, access, req->inherit);
1014             release_object( token );
1015         }
1016         release_object( src_token );
1017     }
1018 }
1019
1020 /* checks the specified privileges are held by the token */
1021 DECL_HANDLER(check_token_privileges)
1022 {
1023     struct token *token;
1024
1025     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1026                                                  TOKEN_QUERY,
1027                                                  &token_ops )))
1028     {
1029         unsigned int count = get_req_data_size() / sizeof(LUID_AND_ATTRIBUTES);
1030         if (get_reply_max_size() >= count * sizeof(LUID_AND_ATTRIBUTES))
1031         {
1032             LUID_AND_ATTRIBUTES *usedprivs = set_reply_data_size( count * sizeof(*usedprivs) );
1033             reply->has_privileges = token_check_privileges( token, req->all_required, get_req_data(), count, usedprivs );
1034         }
1035         else
1036             set_error( STATUS_BUFFER_OVERFLOW );
1037         release_object( token );
1038     }
1039 }
1040
1041 /* checks that a user represented by a token is allowed to access an object
1042  * represented by a security descriptor */
1043 DECL_HANDLER(access_check)
1044 {
1045     size_t sd_size = get_req_data_size();
1046     const struct security_descriptor *sd = get_req_data();
1047     struct token *token;
1048
1049     if (!sd_is_valid( sd, sd_size ))
1050     {
1051         set_error( STATUS_ACCESS_VIOLATION );
1052         return;
1053     }
1054
1055     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1056                                                  TOKEN_QUERY,
1057                                                  &token_ops )))
1058     {
1059         GENERIC_MAPPING mapping;
1060         unsigned int status;
1061         LUID_AND_ATTRIBUTES priv;
1062         unsigned int priv_count = 1;
1063
1064         memset(&priv, 0, sizeof(priv));
1065
1066         /* only impersonation tokens may be used with this function */
1067         if (token->primary)
1068         {
1069             set_error( STATUS_NO_IMPERSONATION_TOKEN );
1070             release_object( token );
1071             return;
1072         }
1073
1074         mapping.GenericRead = req->mapping_read;
1075         mapping.GenericWrite = req->mapping_write;
1076         mapping.GenericExecute = req->mapping_execute;
1077         mapping.GenericAll = req->mapping_all;
1078
1079         reply->access_status = token_access_check(
1080             token, sd, req->desired_access, &priv, &priv_count, &mapping,
1081             &reply->access_granted, &status );
1082
1083         reply->privileges_len = priv_count*sizeof(LUID_AND_ATTRIBUTES);
1084
1085         if ((priv_count > 0) && (reply->privileges_len <= get_reply_max_size()))
1086         {
1087             LUID_AND_ATTRIBUTES *privs = set_reply_data_size( priv_count * sizeof(*privs) );
1088             memcpy( privs, &priv, sizeof(priv) );
1089         }
1090
1091         if (status != STATUS_SUCCESS)
1092             set_error( status );
1093
1094         release_object( token );
1095     }
1096 }
1097
1098 /* */
1099 DECL_HANDLER(get_token_user)
1100 {
1101     struct token *token;
1102
1103     reply->user_len = 0;
1104
1105     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1106                                                  TOKEN_QUERY,
1107                                                  &token_ops )))
1108     {
1109         const SID *user = token->user;
1110
1111         reply->user_len = FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
1112         if (reply->user_len <= get_reply_max_size())
1113         {
1114             SID *user_reply = set_reply_data_size( reply->user_len );
1115             if (user_reply)
1116                 memcpy( user_reply, user, reply->user_len );
1117         }
1118         else set_error( STATUS_BUFFER_TOO_SMALL );
1119
1120         release_object( token );
1121     }
1122 }