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 #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 struct token
  78 {
  79     struct object  obj;             /* object header */
  80     struct list    privileges;      /* privileges available to the token */
  81     struct list    groups;          /* groups that the user of this token belongs to (sid_and_attributes) */
  82     SID           *user;            /* SID of user this token represents */
  83     unsigned       primary;         /* is this a primary or impersonation token? */
  84     ACL           *default_dacl;    /* the default DACL to assign to objects created by this user */
  85     TOKEN_SOURCE   source;          /* source of the token */
  86 };
  87
  88 struct privilege
  89 {
  90     struct list entry;
  91     LUID        luid;
  92     unsigned    enabled  : 1; /* is the privilege currently enabled? */
  93     unsigned    def      : 1; /* is the privilege enabled by default? */
  94 };
  95
  96 struct sid_and_attributes
  97 {
  98     struct list entry;
  99     unsigned    enabled  : 1; /* is the sid currently enabled? */
 100     unsigned    def      : 1; /* is the sid enabled by default? */
 101     unsigned    logon    : 1; /* is this a logon sid? */
 102     unsigned    mandatory: 1; /* is this sid always enabled? */
 103     unsigned    owner    : 1; /* can this sid be an owner of an object? */
 104     unsigned    resource : 1; /* is this a domain-local group? */
 105     unsigned    deny_only: 1; /* is this a sid that should be use for denying only? */
 106     SID         sid;
 107 };
 108
 109 static void token_dump( struct object *obj, int verbose );
 110 static unsigned int token_map_access( struct object *obj, unsigned int access );
 111 static void token_destroy( struct object *obj );
 112
 113 static const struct object_ops token_ops =
 114 {
 115     sizeof(struct token),      /* size */
 116     token_dump,                /* dump */
 117     no_add_queue,              /* add_queue */
 118     NULL,                      /* remove_queue */
 119     NULL,                      /* signaled */
 120     NULL,                      /* satisfied */
 121     no_signal,                 /* signal */
 122     no_get_fd,                 /* get_fd */
 123     token_map_access,          /* map_access */
 124     no_lookup_name,            /* lookup_name */
 125     no_close_handle,           /* close_handle */
 126     token_destroy              /* destroy */
 127 };
 128
 129
 130 static void token_dump( struct object *obj, int verbose )
 131 {
 132     fprintf( stderr, "Security token\n" );
 133     /* FIXME: dump token members */
 134 }
 135
 136 static unsigned int token_map_access( struct object *obj, unsigned int access )
 137 {
 138     if (access & GENERIC_READ)    access |= TOKEN_READ;
 139     if (access & GENERIC_WRITE)   access |= TOKEN_WRITE;
 140     if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
 141     if (access & GENERIC_ALL)     access |= TOKEN_ALL_ACCESS;
 142     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 143 }
 144
 145 static SID *security_sid_alloc( const SID_IDENTIFIER_AUTHORITY *idauthority, int subauthcount, const unsigned int subauth[] )
 146 {
 147     int i;
 148     SID *sid = mem_alloc( FIELD_OFFSET(SID, SubAuthority[subauthcount]) );
 149     if (!sid) return NULL;
 150     sid->Revision = SID_REVISION;
 151     sid->SubAuthorityCount = subauthcount;
 152     sid->IdentifierAuthority = *idauthority;
 153     for (i = 0; i < subauthcount; i++)
 154         sid->SubAuthority[i] = subauth[i];
 155     return sid;
 156 }
 157
 158 static inline int security_equal_sid( const SID *sid1, const SID *sid2 )
 159 {
 160     return ((sid1->SubAuthorityCount == sid2->SubAuthorityCount) &&
 161         !memcmp( sid1, sid2, FIELD_OFFSET(SID, SubAuthority[sid1->SubAuthorityCount]) ));
 162 }
 163
 164 void security_set_thread_token( struct thread *thread, obj_handle_t handle )
 165 {
 166     if (!handle)
 167     {
 168         if (thread->token)
 169             release_object( thread->token );
 170         thread->token = NULL;
 171     }
 172     else
 173     {
 174         struct token *token = (struct token *)get_handle_obj( current->process,
 175                                                               handle,
 176                                                               TOKEN_IMPERSONATE,
 177                                                               &token_ops );
 178         if (token)
 179         {
 180             if (thread->token)
 181                 release_object( thread->token );
 182             thread->token = token;
 183         }
 184     }
 185 }
 186
 187 static const ACE_HEADER *ace_next( const ACE_HEADER *ace )
 188 {
 189     return (const ACE_HEADER *)((const char *)ace + ace->AceSize);
 190 }
 191
 192 static int acl_is_valid( const ACL *acl, size_t size )
 193 {
 194     ULONG i;
 195     const ACE_HEADER *ace;
 196
 197     if (size < sizeof(ACL))
 198         return FALSE;
 199
 200     size = min(size, MAX_ACL_LEN);
 201
 202     size -= sizeof(ACL);
 203
 204     ace = (const ACE_HEADER *)(acl + 1);
 205     for (i = 0; i < acl->AceCount; i++)
 206     {
 207         const SID *sid;
 208         size_t sid_size;
 209
 210         if (size < sizeof(ACE_HEADER))
 211             return FALSE;
 212         if (size < ace->AceSize)
 213             return FALSE;
 214         size -= ace->AceSize;
 215         switch (ace->AceType)
 216         {
 217         case ACCESS_DENIED_ACE_TYPE:
 218             sid = (const SID *)&((const ACCESS_DENIED_ACE *)ace)->SidStart;
 219             sid_size = ace->AceSize - FIELD_OFFSET(ACCESS_DENIED_ACE, SidStart);
 220             break;
 221         case ACCESS_ALLOWED_ACE_TYPE:
 222             sid = (const SID *)&((const ACCESS_ALLOWED_ACE *)ace)->SidStart;
 223             sid_size = ace->AceSize - FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart);
 224             break;
 225         case SYSTEM_AUDIT_ACE_TYPE:
 226             sid = (const SID *)&((const SYSTEM_AUDIT_ACE *)ace)->SidStart;
 227             sid_size = ace->AceSize - FIELD_OFFSET(SYSTEM_AUDIT_ACE, SidStart);
 228             break;
 229         case SYSTEM_ALARM_ACE_TYPE:
 230             sid = (const SID *)&((const SYSTEM_ALARM_ACE *)ace)->SidStart;
 231             sid_size = ace->AceSize - FIELD_OFFSET(SYSTEM_ALARM_ACE, SidStart);
 232             break;
 233         default:
 234             return FALSE;
 235         }
 236         if (sid_size < FIELD_OFFSET(SID, SubAuthority[0]) ||
 237             sid_size < FIELD_OFFSET(SID, SubAuthority[sid->SubAuthorityCount]))
 238             return FALSE;
 239         ace = ace_next( ace );
 240     }
 241     return TRUE;
 242 }
 243
 244 /* gets the discretionary access control list from a security descriptor */
 245 static inline const ACL *sd_get_dacl( const struct security_descriptor *sd, int *present )
 246 {
 247     *present = (sd->control & SE_DACL_PRESENT ? TRUE : FALSE);
 248
 249     if (sd->dacl_len)
 250         return (const ACL *)((const char *)(sd + 1) +
 251             sd->owner_len + sd->group_len + sd->sacl_len);
 252     else
 253         return NULL;
 254 }
 255
 256 /* gets the system access control list from a security descriptor */
 257 static inline const ACL *sd_get_sacl( const struct security_descriptor *sd, int *present )
 258 {
 259     *present = (sd->control & SE_SACL_PRESENT ? TRUE : FALSE);
 260
 261     if (sd->sacl_len)
 262         return (const ACL *)((const char *)(sd + 1) +
 263             sd->owner_len + sd->group_len);
 264     else
 265         return NULL;
 266 }
 267
 268 /* gets the owner from a security descriptor */
 269 static inline const SID *sd_get_owner( const struct security_descriptor *sd )
 270 {
 271     if (sd->owner_len)
 272         return (const SID *)(sd + 1);
 273     else
 274         return NULL;
 275 }
 276
 277 /* gets the primary group from a security descriptor */
 278 static inline const SID *sd_get_group( const struct security_descriptor *sd )
 279 {
 280     if (sd->group_len)
 281         return (const SID *)((const char *)(sd + 1) + sd->owner_len);
 282     else
 283         return NULL;
 284 }
 285
 286 /* checks whether all members of a security descriptor fit inside the size
 287  * of memory specified */
 288 static int sd_is_valid( const struct security_descriptor *sd, size_t size )
 289 {
 290     size_t offset = sizeof(struct security_descriptor);
 291     const SID *group;
 292     const SID *owner;
 293     const ACL *sacl;
 294     const ACL *dacl;
 295     int dummy;
 296
 297     if (size < offset)
 298         return FALSE;
 299
 300     if ((sd->owner_len >= FIELD_OFFSET(SID, SubAuthority[255])) ||
 301         (offset + sd->owner_len > size))
 302         return FALSE;
 303     owner = sd_get_owner( sd );
 304     if (owner)
 305     {
 306         size_t needed_size = FIELD_OFFSET(SID, SubAuthority[owner->SubAuthorityCount]);
 307         if ((sd->owner_len < sizeof(SID)) || (needed_size > sd->owner_len))
 308             return FALSE;
 309     }
 310     offset += sd->owner_len;
 311
 312     if ((sd->group_len >= FIELD_OFFSET(SID, SubAuthority[255])) ||
 313         (offset + sd->group_len > size))
 314         return FALSE;
 315     group = sd_get_group( sd );
 316     if (group)
 317     {
 318         size_t needed_size = FIELD_OFFSET(SID, SubAuthority[group->SubAuthorityCount]);
 319         if ((sd->owner_len < sizeof(SID)) || (needed_size > sd->owner_len))
 320             return FALSE;
 321     }
 322     offset += sd->group_len;
 323
 324     if ((sd->sacl_len >= MAX_ACL_LEN) || (offset + sd->sacl_len > size))
 325         return FALSE;
 326     sacl = sd_get_sacl( sd, &dummy );
 327     if (sacl && !acl_is_valid( sacl, sd->sacl_len ))
 328         return FALSE;
 329     offset += sd->sacl_len;
 330
 331     if ((sd->dacl_len >= MAX_ACL_LEN) || (offset + sd->dacl_len > size))
 332         return FALSE;
 333     dacl = sd_get_dacl( sd, &dummy );
 334     if (dacl && !acl_is_valid( dacl, sd->dacl_len ))
 335         return FALSE;
 336     offset += sd->dacl_len;
 337
 338     return TRUE;
 339 }
 340
 341 /* maps from generic rights to specific rights as given by a mapping */
 342 static inline void map_generic_mask(unsigned int *mask, const GENERIC_MAPPING *mapping)
 343 {
 344     if (*mask & GENERIC_READ) *mask |= mapping->GenericRead;
 345     if (*mask & GENERIC_WRITE) *mask |= mapping->GenericWrite;
 346     if (*mask & GENERIC_EXECUTE) *mask |= mapping->GenericExecute;
 347     if (*mask & GENERIC_ALL) *mask |= mapping->GenericAll;
 348     *mask &= 0x0FFFFFFF;
 349 }
 350
 351 static inline int is_equal_luid( const LUID *luid1, const LUID *luid2 )
 352 {
 353     return (luid1->LowPart == luid2->LowPart && luid1->HighPart == luid2->HighPart);
 354 }
 355
 356 static inline void luid_and_attr_from_privilege( LUID_AND_ATTRIBUTES *out, const struct privilege *in)
 357 {
 358     out->Luid = in->luid;
 359     out->Attributes =
 360         (in->enabled ? SE_PRIVILEGE_ENABLED : 0) |
 361         (in->def ? SE_PRIVILEGE_ENABLED_BY_DEFAULT : 0);
 362 }
 363
 364 static struct privilege *privilege_add( struct token *token, const LUID *luid, int enabled )
 365 {
 366     struct privilege *privilege = mem_alloc( sizeof(*privilege) );
 367     if (privilege)
 368     {
 369         privilege->luid = *luid;
 370         privilege->def = privilege->enabled = (enabled != 0);
 371         list_add_tail( &token->privileges, &privilege->entry );
 372     }
 373     return privilege;
 374 }
 375
 376 static inline void privilege_remove( struct privilege *privilege )
 377 {
 378     list_remove( &privilege->entry );
 379     free( privilege );
 380 }
 381
 382 static void token_destroy( struct object *obj )
 383 {
 384     struct token* token;
 385     struct list *cursor, *cursor_next;
 386
 387     assert( obj->ops == &token_ops );
 388     token = (struct token *)obj;
 389
 390     free( token->user );
 391
 392     LIST_FOR_EACH_SAFE( cursor, cursor_next, &token->privileges )
 393     {
 394         struct privilege *privilege = LIST_ENTRY( cursor, struct privilege, entry );
 395         privilege_remove( privilege );
 396     }
 397
 398     LIST_FOR_EACH_SAFE( cursor, cursor_next, &token->groups )
 399     {
 400         struct sid_and_attributes *group = LIST_ENTRY( cursor, struct sid_and_attributes, entry );
 401         list_remove( &group->entry );
 402         free( group );
 403     }
 404
 405     free( token->default_dacl );
 406 }
 407
 408 /* creates a new token.
 409  *  groups may be NULL if group_count is 0.
 410  *  privs may be NULL if priv_count is 0.
 411  *  default_dacl may be NULL, indicating that all objects created by the user
 412  *   are unsecured.
 413  */
 414 static struct token *create_token( unsigned primary, const SID *user,
 415                                    const SID_AND_ATTRIBUTES *groups, unsigned int group_count,
 416                                    const LUID_AND_ATTRIBUTES *privs, unsigned int priv_count,
 417                                    const ACL *default_dacl, TOKEN_SOURCE source )
 418 {
 419     struct token *token = alloc_object( &token_ops );
 420     if (token)
 421     {
 422         int i;
 423
 424         list_init( &token->privileges );
 425         list_init( &token->groups );
 426         token->primary = primary;
 427
 428         /* copy user */
 429         token->user = memdup( user, FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) );
 430         if (!token->user)
 431         {
 432             release_object( token );
 433             return NULL;
 434         }
 435
 436         /* copy groups */
 437         for (i = 0; i < group_count; i++)
 438         {
 439             size_t size = FIELD_OFFSET( struct sid_and_attributes, sid.SubAuthority[((const SID *)groups[i].Sid)->SubAuthorityCount] );
 440             struct sid_and_attributes *group = mem_alloc( size );
 441             memcpy( &group->sid, groups[i].Sid, FIELD_OFFSET( SID, SubAuthority[((const SID *)groups[i].Sid)->SubAuthorityCount] ) );
 442             group->enabled = TRUE;
 443             group->def = TRUE;
 444             group->logon = FALSE;
 445             group->mandatory = (groups[i].Attributes & SE_GROUP_MANDATORY) ? TRUE : FALSE;
 446             group->owner = FALSE;
 447             group->resource = FALSE;
 448             group->deny_only = FALSE;
 449             list_add_tail( &token->groups, &group->entry );
 450         }
 451
 452         /* copy privileges */
 453         for (i = 0; i < priv_count; i++)
 454         {
 455             /* note: we don't check uniqueness: the caller must make sure
 456              * privs doesn't contain any duplicate luids */
 457             if (!privilege_add( token, &privs[i].Luid,
 458                                 privs[i].Attributes & SE_PRIVILEGE_ENABLED ))
 459             {
 460                 release_object( token );
 461                 return NULL;
 462             }
 463         }
 464
 465         if (default_dacl)
 466         {
 467             token->default_dacl = memdup( default_dacl, default_dacl->AclSize );
 468             if (!token->default_dacl)
 469             {
 470                 release_object( token );
 471                 return NULL;
 472             }
 473         }
 474         else
 475             token->default_dacl = NULL;
 476
 477         token->source = source;
 478     }
 479     return token;
 480 }
 481
 482 static ACL *create_default_dacl( const SID *user )
 483 {
 484     ACCESS_ALLOWED_ACE *aaa;
 485     ACL *default_dacl;
 486     SID *sid;
 487     size_t default_dacl_size = sizeof(ACL) +
 488                                2*(sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD)) +
 489                                sizeof(local_system_sid) +
 490                                FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
 491
 492     default_dacl = mem_alloc( default_dacl_size );
 493     if (!default_dacl) return NULL;
 494
 495     default_dacl->AclRevision = MAX_ACL_REVISION;
 496     default_dacl->Sbz1 = 0;
 497     default_dacl->AclSize = default_dacl_size;
 498     default_dacl->AceCount = 2;
 499     default_dacl->Sbz2 = 0;
 500
 501     /* GENERIC_ALL for Local System */
 502     aaa = (ACCESS_ALLOWED_ACE *)(default_dacl + 1);
 503     aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 504     aaa->Header.AceFlags = 0;
 505     aaa->Header.AceSize = (sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD)) +
 506                           sizeof(local_system_sid);
 507     aaa->Mask = GENERIC_ALL;
 508     sid = (SID *)&aaa->SidStart;
 509     memcpy( sid, &local_system_sid, sizeof(local_system_sid) );
 510
 511     /* GENERIC_ALL for specified user */
 512     aaa = (ACCESS_ALLOWED_ACE *)((const char *)aaa + aaa->Header.AceSize);
 513     aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 514     aaa->Header.AceFlags = 0;
 515     aaa->Header.AceSize = (sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD)) +
 516                           FIELD_OFFSET( SID, SubAuthority[user->SubAuthorityCount] );
 517     aaa->Mask = GENERIC_ALL;
 518     sid = (SID *)&aaa->SidStart;
 519     memcpy( sid, user, FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) );
 520
 521     return default_dacl;
 522 }
 523
 524 struct sid_data
 525 {
 526     SID_IDENTIFIER_AUTHORITY idauth;
 527     int count;
 528     unsigned int subauth[MAX_SUBAUTH_COUNT];
 529 };
 530
 531 struct token *token_create_admin( void )
 532 {
 533     struct token *token = NULL;
 534     static const SID_IDENTIFIER_AUTHORITY nt_authority = { SECURITY_NT_AUTHORITY };
 535     static const unsigned int alias_admins_subauth[] = { SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS };
 536     static const unsigned int alias_users_subauth[] = { SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_USERS };
 537     PSID alias_admins_sid;
 538     PSID alias_users_sid;
 539     ACL *default_dacl = create_default_dacl( &local_system_sid );
 540
 541     alias_admins_sid = security_sid_alloc( &nt_authority, sizeof(alias_admins_subauth)/sizeof(alias_admins_subauth[0]),
 542                                            alias_admins_subauth );
 543     alias_users_sid = security_sid_alloc( &nt_authority, sizeof(alias_users_subauth)/sizeof(alias_users_subauth[0]),
 544                                           alias_users_subauth );
 545
 546     if (alias_admins_sid && alias_users_sid && default_dacl)
 547     {
 548         const LUID_AND_ATTRIBUTES admin_privs[] =
 549         {
 550             { SeChangeNotifyPrivilege        , SE_PRIVILEGE_ENABLED },
 551             { SeSecurityPrivilege            , 0                    },
 552             { SeBackupPrivilege              , 0                    },
 553             { SeRestorePrivilege             , 0                    },
 554             { SeSystemtimePrivilege          , 0                    },
 555             { SeShutdownPrivilege            , 0                    },
 556             { SeRemoteShutdownPrivilege      , 0                    },
 557             { SeTakeOwnershipPrivilege       , 0                    },
 558             { SeDebugPrivilege               , 0                    },
 559             { SeSystemEnvironmentPrivilege   , 0                    },
 560             { SeSystemProfilePrivilege       , 0                    },
 561             { SeProfileSingleProcessPrivilege, 0                    },
 562             { SeIncreaseBasePriorityPrivilege, 0                    },
 563             { SeLoadDriverPrivilege          , 0                    },
 564             { SeCreatePagefilePrivilege      , 0                    },
 565             { SeIncreaseQuotaPrivilege       , 0                    },
 566             { SeUndockPrivilege              , 0                    },
 567             { SeManageVolumePrivilege        , 0                    },
 568             { SeImpersonatePrivilege         , SE_PRIVILEGE_ENABLED },
 569             { SeCreateGlobalPrivilege        , SE_PRIVILEGE_ENABLED },
 570         };
 571         /* note: we don't include non-builtin groups here for the user -
 572          * telling us these is the job of a client-side program */
 573         const SID_AND_ATTRIBUTES admin_groups[] =
 574         {
 575             { security_world_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
 576             { security_local_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
 577             { security_interactive_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
 578             { security_authenticated_user_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
 579             { alias_admins_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
 580             { alias_users_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
 581         };
 582         static const TOKEN_SOURCE admin_source = {"SeMgr", {0, 0}};
 583         /* note: we just set the user sid to be the interactive builtin sid -
 584          * we should really translate the UNIX user id to a sid */
 585         token = create_token( TRUE, &interactive_sid,
 586                             admin_groups, sizeof(admin_groups)/sizeof(admin_groups[0]),
 587                             admin_privs, sizeof(admin_privs)/sizeof(admin_privs[0]),
 588                             default_dacl, admin_source );
 589     }
 590
 591     if (alias_admins_sid)
 592         free( alias_admins_sid );
 593     if (alias_users_sid)
 594         free( alias_users_sid );
 595     if (default_dacl)
 596         free( default_dacl );
 597
 598     return token;
 599 }
 600
 601 static struct privilege *token_find_privilege( struct token *token, const LUID *luid, int enabled_only )
 602 {
 603     struct privilege *privilege;
 604     LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
 605     {
 606         if (is_equal_luid( luid, &privilege->luid ))
 607         {
 608             if (enabled_only && !privilege->enabled)
 609                 return NULL;
 610             return privilege;
 611         }
 612     }
 613     return NULL;
 614 }
 615
 616 static unsigned int token_adjust_privileges( struct token *token, const LUID_AND_ATTRIBUTES *privs,
 617                                              unsigned int count, LUID_AND_ATTRIBUTES *mod_privs,
 618                                              unsigned int mod_privs_count )
 619 {
 620     int i;
 621     unsigned int modified_count = 0;
 622
 623     for (i = 0; i < count; i++)
 624     {
 625         struct privilege *privilege =
 626             token_find_privilege( token, &privs[i].Luid, FALSE );
 627         if (!privilege)
 628         {
 629             set_error( STATUS_NOT_ALL_ASSIGNED );
 630             continue;
 631         }
 632
 633         if (privs[i].Attributes & SE_PRIVILEGE_REMOVE)
 634             privilege_remove( privilege );
 635         else
 636         {
 637             /* save previous state for caller */
 638             if (mod_privs_count)
 639             {
 640                 luid_and_attr_from_privilege(mod_privs, privilege);
 641                 mod_privs++;
 642                 mod_privs_count--;
 643                 modified_count++;
 644             }
 645
 646             if (privs[i].Attributes & SE_PRIVILEGE_ENABLED)
 647                 privilege->enabled = TRUE;
 648             else
 649                 privilege->enabled = FALSE;
 650         }
 651     }
 652     return modified_count;
 653 }
 654
 655 static void token_disable_privileges( struct token *token )
 656 {
 657     struct privilege *privilege;
 658     LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
 659         privilege->enabled = FALSE;
 660 }
 661
 662 int token_check_privileges( struct token *token, int all_required,
 663                             const LUID_AND_ATTRIBUTES *reqprivs,
 664                             unsigned int count, LUID_AND_ATTRIBUTES *usedprivs)
 665 {
 666     int i;
 667     unsigned int enabled_count = 0;
 668
 669     for (i = 0; i < count; i++)
 670     {
 671         struct privilege *privilege =
 672             token_find_privilege( token, &reqprivs[i].Luid, TRUE );
 673
 674         if (usedprivs)
 675             usedprivs[i] = reqprivs[i];
 676
 677         if (privilege && privilege->enabled)
 678         {
 679             enabled_count++;
 680             if (usedprivs)
 681                 usedprivs[i].Attributes |= SE_PRIVILEGE_USED_FOR_ACCESS;
 682         }
 683     }
 684
 685     if (all_required)
 686         return (enabled_count == count);
 687     else
 688         return (enabled_count > 0);
 689 }
 690
 691 static int token_sid_present( struct token *token, const SID *sid, int deny )
 692 {
 693     struct sid_and_attributes *group;
 694
 695     if (security_equal_sid( token->user, sid )) return TRUE;
 696
 697     LIST_FOR_EACH_ENTRY( group, &token->groups, struct sid_and_attributes, entry )
 698     {
 699         if (!group->enabled) continue;
 700         if (group->deny_only && !deny) continue;
 701
 702         if (security_equal_sid( &group->sid, sid )) return TRUE;
 703     }
 704
 705     return FALSE;
 706 }
 707
 708 /* checks access to a security descriptor. sd must have been validated by caller.
 709  * it returns STATUS_SUCCESS if access was granted to the object, or an error
 710  * status code if not, giving the reason. errors not relating to giving access
 711  * to the object are returned in the status parameter. granted_access and
 712  * status always have a valid value stored in them on return. */
 713 static unsigned int token_access_check( struct token *token,
 714                                  const struct security_descriptor *sd,
 715                                  unsigned int desired_access,
 716                                  LUID_AND_ATTRIBUTES *privs,
 717                                  unsigned int *priv_count,
 718                                  const GENERIC_MAPPING *mapping,
 719                                  unsigned int *granted_access,
 720                                  unsigned int *status )
 721 {
 722     unsigned int current_access = 0;
 723     unsigned int denied_access = 0;
 724     ULONG i;
 725     const ACL *dacl;
 726     int dacl_present;
 727     const ACE_HEADER *ace;
 728     const SID *owner;
 729
 730     /* assume success, but no access rights */
 731     *status = STATUS_SUCCESS;
 732     *granted_access = 0;
 733
 734     /* fail if desired_access contains generic rights */
 735     if (desired_access & (GENERIC_READ|GENERIC_WRITE|GENERIC_EXECUTE|GENERIC_ALL))
 736     {
 737         *priv_count = 0;
 738         *status = STATUS_GENERIC_NOT_MAPPED;
 739         return STATUS_ACCESS_DENIED;
 740     }
 741
 742     dacl = sd_get_dacl( sd, &dacl_present );
 743     owner = sd_get_owner( sd );
 744     if (!owner || !sd_get_group( sd ))
 745     {
 746         *priv_count = 0;
 747         *status = STATUS_INVALID_SECURITY_DESCR;
 748         return STATUS_ACCESS_DENIED;
 749     }
 750
 751     /* 1: Grant desired access if the object is unprotected */
 752     if (!dacl_present)
 753     {
 754         *priv_count = 0;
 755         *granted_access = desired_access;
 756         return STATUS_SUCCESS;
 757     }
 758     if (!dacl)
 759     {
 760         *priv_count = 0;
 761         return STATUS_ACCESS_DENIED;
 762     }
 763
 764     /* 2: Check if caller wants access to system security part. Note: access
 765      * is only granted if specifically asked for */
 766     if (desired_access & ACCESS_SYSTEM_SECURITY)
 767     {
 768         const LUID_AND_ATTRIBUTES security_priv = { SeSecurityPrivilege, 0 };
 769         LUID_AND_ATTRIBUTES retpriv = security_priv;
 770         if (token_check_privileges( token, TRUE, &security_priv, 1, &retpriv ))
 771         {
 772             if (priv_count)
 773             {
 774                 /* assumes that there will only be one privilege to return */
 775                 if (*priv_count >= 1)
 776                 {
 777                     *priv_count = 1;
 778                     *privs = retpriv;
 779                 }
 780                 else
 781                 {
 782                     *priv_count = 1;
 783                     return STATUS_BUFFER_TOO_SMALL;
 784                 }
 785             }
 786             current_access |= ACCESS_SYSTEM_SECURITY;
 787             if (desired_access == current_access)
 788             {
 789                 *granted_access = current_access;
 790                 return STATUS_SUCCESS;
 791             }
 792         }
 793         else
 794         {
 795             *priv_count = 0;
 796             return STATUS_PRIVILEGE_NOT_HELD;
 797         }
 798     }
 799     else if (priv_count) *priv_count = 0;
 800
 801     /* 3: Check whether the token is the owner */
 802     /* NOTE: SeTakeOwnershipPrivilege is not checked for here - it is instead
 803      * checked when a "set owner" call is made, overriding the access rights
 804      * determined here. */
 805     if (token_sid_present( token, owner, FALSE ))
 806     {
 807         current_access |= (READ_CONTROL | WRITE_DAC);
 808         if (desired_access == current_access)
 809         {
 810             *granted_access = current_access;
 811             return STATUS_SUCCESS;
 812         }
 813     }
 814
 815     /* 4: Grant rights according to the DACL */
 816     ace = (const ACE_HEADER *)(dacl + 1);
 817     for (i = 0; i < dacl->AceCount; i++)
 818     {
 819         const ACCESS_ALLOWED_ACE *aa_ace;
 820         const ACCESS_DENIED_ACE *ad_ace;
 821         const SID *sid;
 822         switch (ace->AceType)
 823         {
 824         case ACCESS_DENIED_ACE_TYPE:
 825             ad_ace = (const ACCESS_DENIED_ACE *)ace;
 826             sid = (const SID *)&ad_ace->SidStart;
 827             if (token_sid_present( token, sid, TRUE ))
 828             {
 829                 unsigned int access = ad_ace->Mask;
 830                 map_generic_mask(&access, mapping);
 831                 if (desired_access & MAXIMUM_ALLOWED)
 832                     denied_access |= access;
 833                 else
 834                 {
 835                     denied_access |= (access & ~current_access);
 836                     if (desired_access & access)
 837                     {
 838                         *granted_access = 0;
 839                         return STATUS_SUCCESS;
 840                     }
 841                 }
 842             }
 843             break;
 844         case ACCESS_ALLOWED_ACE_TYPE:
 845             aa_ace = (const ACCESS_ALLOWED_ACE *)ace;
 846             sid = (const SID *)&aa_ace->SidStart;
 847             if (token_sid_present( token, sid, FALSE ))
 848             {
 849                 unsigned int access = aa_ace->Mask;
 850                 map_generic_mask(&access, mapping);
 851                 if (desired_access & MAXIMUM_ALLOWED)
 852                     current_access |= access;
 853                 else
 854                     current_access |= (access & ~denied_access);
 855             }
 856             break;
 857         }
 858
 859         /* don't bother carrying on checking if we've already got all of
 860             * rights we need */
 861         if (desired_access == *granted_access)
 862             break;
 863
 864         ace = ace_next( ace );
 865     }
 866
 867     if (desired_access & MAXIMUM_ALLOWED)
 868     {
 869         *granted_access = current_access & ~denied_access;
 870         if (*granted_access)
 871             return STATUS_SUCCESS;
 872         else
 873             return STATUS_ACCESS_DENIED;
 874     }
 875     else
 876     {
 877         if ((current_access & desired_access) == desired_access)
 878         {
 879             *granted_access = current_access & desired_access;
 880             return STATUS_SUCCESS;
 881         }
 882         else
 883             return STATUS_ACCESS_DENIED;
 884     }
 885 }
 886
 887 const ACL *token_get_default_dacl( struct token *token )
 888 {
 889     return token->default_dacl;
 890 }
 891
 892 /* open a security token */
 893 DECL_HANDLER(open_token)
 894 {
 895     if (req->flags & OPEN_TOKEN_THREAD)
 896     {
 897         struct thread *thread = get_thread_from_handle( req->handle, 0 );
 898         if (thread)
 899         {
 900             if (thread->token)
 901                 reply->token = alloc_handle( current->process, thread->token, req->access,
 902                                              req->attributes );
 903             else
 904                 set_error(STATUS_NO_TOKEN);
 905             release_object( thread );
 906         }
 907     }
 908     else
 909     {
 910         struct process *process = get_process_from_handle( req->handle, 0 );
 911         if (process)
 912         {
 913             if (process->token)
 914                 reply->token = alloc_handle( current->process, process->token, req->access,
 915                                              req->attributes );
 916             else
 917                 set_error(STATUS_NO_TOKEN);
 918             release_object( process );
 919         }
 920     }
 921 }
 922
 923 /* adjust the privileges held by a token */
 924 DECL_HANDLER(adjust_token_privileges)
 925 {
 926     struct token *token;
 927     unsigned int access = TOKEN_ADJUST_PRIVILEGES;
 928
 929     if (req->get_modified_state) access |= TOKEN_QUERY;
 930
 931     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
 932                                                  access, &token_ops )))
 933     {
 934         const LUID_AND_ATTRIBUTES *privs = get_req_data();
 935         LUID_AND_ATTRIBUTES *modified_privs = NULL;
 936         unsigned int priv_count = get_req_data_size() / sizeof(LUID_AND_ATTRIBUTES);
 937         unsigned int modified_priv_count = 0;
 938
 939         if (req->get_modified_state && !req->disable_all)
 940         {
 941             int i;
 942             /* count modified privs */
 943             for (i = 0; i < priv_count; i++)
 944             {
 945                 struct privilege *privilege =
 946                     token_find_privilege( token, &privs[i].Luid, FALSE );
 947                 if (privilege && req->get_modified_state)
 948                     modified_priv_count++;
 949             }
 950             reply->len = modified_priv_count;
 951             modified_priv_count = min( modified_priv_count, get_reply_max_size() / sizeof(*modified_privs) );
 952             if (modified_priv_count)
 953                 modified_privs = set_reply_data_size( modified_priv_count * sizeof(*modified_privs) );
 954         }
 955         reply->len = modified_priv_count * sizeof(*modified_privs);
 956
 957         if (req->disable_all)
 958             token_disable_privileges( token );
 959         else
 960             modified_priv_count = token_adjust_privileges( token, privs,
 961                 priv_count, modified_privs, modified_priv_count );
 962
 963         release_object( token );
 964     }
 965 }
 966
 967 /* retrieves the list of privileges that may be held be the token */
 968 DECL_HANDLER(get_token_privileges)
 969 {
 970     struct token *token;
 971
 972     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
 973                                                  TOKEN_QUERY,
 974                                                  &token_ops )))
 975     {
 976         int priv_count = 0;
 977         LUID_AND_ATTRIBUTES *privs;
 978         struct privilege *privilege;
 979
 980         LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
 981             priv_count++;
 982
 983         reply->len = priv_count * sizeof(*privs);
 984         if (reply->len <= get_reply_max_size())
 985         {
 986             privs = set_reply_data_size( priv_count * sizeof(*privs) );
 987             if (privs)
 988             {
 989                 int i = 0;
 990                 LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
 991                 {
 992                     luid_and_attr_from_privilege( &privs[i], privilege );
 993                     i++;
 994                 }
 995             }
 996         }
 997         else
 998             set_error(STATUS_BUFFER_TOO_SMALL);
 999
1000         release_object( token );
1001     }
1002 }
1003
1004 /* creates a duplicate of the token */
1005 DECL_HANDLER(duplicate_token)
1006 {
1007     struct token *src_token;
1008     if ((src_token = (struct token *)get_handle_obj( current->process, req->handle,
1009                                                      TOKEN_DUPLICATE,
1010                                                      &token_ops )))
1011     {
1012         /* FIXME: use req->impersonation_level */
1013         struct token *token = create_token( req->primary, src_token->user,
1014                                             NULL, 0, NULL, 0,
1015                                             src_token->default_dacl,
1016                                             src_token->source );
1017         if (token)
1018         {
1019             struct privilege *privilege;
1020             struct sid_and_attributes *group;
1021             unsigned int access;
1022
1023             /* copy groups */
1024             LIST_FOR_EACH_ENTRY( group, &src_token->groups, struct sid_and_attributes, entry )
1025             {
1026                 size_t size = FIELD_OFFSET( struct sid_and_attributes, sid.SubAuthority[group->sid.SubAuthorityCount] );
1027                 struct sid_and_attributes *newgroup = mem_alloc( size );
1028                 memcpy( newgroup, group, size );
1029                 list_add_tail( &token->groups, &newgroup->entry );
1030             }
1031
1032             /* copy privileges */
1033             LIST_FOR_EACH_ENTRY( privilege, &src_token->privileges, struct privilege, entry )
1034                 privilege_add( token, &privilege->luid, privilege->enabled );
1035
1036             access = req->access;
1037             if (access & MAXIMUM_ALLOWED) access = TOKEN_ALL_ACCESS; /* FIXME: needs general solution */
1038             reply->new_handle = alloc_handle( current->process, token, access, req->attributes);
1039             release_object( token );
1040         }
1041         release_object( src_token );
1042     }
1043 }
1044
1045 /* checks the specified privileges are held by the token */
1046 DECL_HANDLER(check_token_privileges)
1047 {
1048     struct token *token;
1049
1050     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1051                                                  TOKEN_QUERY,
1052                                                  &token_ops )))
1053     {
1054         unsigned int count = get_req_data_size() / sizeof(LUID_AND_ATTRIBUTES);
1055         if (get_reply_max_size() >= count * sizeof(LUID_AND_ATTRIBUTES))
1056         {
1057             LUID_AND_ATTRIBUTES *usedprivs = set_reply_data_size( count * sizeof(*usedprivs) );
1058             reply->has_privileges = token_check_privileges( token, req->all_required, get_req_data(), count, usedprivs );
1059         }
1060         else
1061             set_error( STATUS_BUFFER_OVERFLOW );
1062         release_object( token );
1063     }
1064 }
1065
1066 /* checks that a user represented by a token is allowed to access an object
1067  * represented by a security descriptor */
1068 DECL_HANDLER(access_check)
1069 {
1070     size_t sd_size = get_req_data_size();
1071     const struct security_descriptor *sd = get_req_data();
1072     struct token *token;
1073
1074     if (!sd_is_valid( sd, sd_size ))
1075     {
1076         set_error( STATUS_ACCESS_VIOLATION );
1077         return;
1078     }
1079
1080     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1081                                                  TOKEN_QUERY,
1082                                                  &token_ops )))
1083     {
1084         GENERIC_MAPPING mapping;
1085         unsigned int status;
1086         LUID_AND_ATTRIBUTES priv;
1087         unsigned int priv_count = 1;
1088
1089         memset(&priv, 0, sizeof(priv));
1090
1091         /* only impersonation tokens may be used with this function */
1092         if (token->primary)
1093         {
1094             set_error( STATUS_NO_IMPERSONATION_TOKEN );
1095             release_object( token );
1096             return;
1097         }
1098
1099         mapping.GenericRead = req->mapping_read;
1100         mapping.GenericWrite = req->mapping_write;
1101         mapping.GenericExecute = req->mapping_execute;
1102         mapping.GenericAll = req->mapping_all;
1103
1104         reply->access_status = token_access_check(
1105             token, sd, req->desired_access, &priv, &priv_count, &mapping,
1106             &reply->access_granted, &status );
1107
1108         reply->privileges_len = priv_count*sizeof(LUID_AND_ATTRIBUTES);
1109
1110         if ((priv_count > 0) && (reply->privileges_len <= get_reply_max_size()))
1111         {
1112             LUID_AND_ATTRIBUTES *privs = set_reply_data_size( priv_count * sizeof(*privs) );
1113             memcpy( privs, &priv, sizeof(priv) );
1114         }
1115
1116         if (status != STATUS_SUCCESS)
1117             set_error( status );
1118
1119         release_object( token );
1120     }
1121 }
1122
1123 /* */
1124 DECL_HANDLER(get_token_user)
1125 {
1126     struct token *token;
1127
1128     reply->user_len = 0;
1129
1130     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1131                                                  TOKEN_QUERY,
1132                                                  &token_ops )))
1133     {
1134         const SID *user = token->user;
1135
1136         reply->user_len = FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
1137         if (reply->user_len <= get_reply_max_size())
1138         {
1139             SID *user_reply = set_reply_data_size( reply->user_len );
1140             if (user_reply)
1141                 memcpy( user_reply, user, reply->user_len );
1142         }
1143         else set_error( STATUS_BUFFER_TOO_SMALL );
1144
1145         release_object( token );
1146     }
1147 }