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[wine.git] / server / token.c
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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 #include <unistd.h>
30
31 #include "ntstatus.h"
32 #define WIN32_NO_STATUS
33 #include "windef.h"
34 #include "winternl.h"
35
36 #include "handle.h"
37 #include "thread.h"
38 #include "process.h"
39 #include "request.h"
40 #include "security.h"
41
42 #define MAX_SUBAUTH_COUNT 1
43
44 const LUID SeIncreaseQuotaPrivilege = { 5, 0 };
45 const LUID SeSecurityPrivilege = { 8, 0 };
46 const LUID SeTakeOwnershipPrivilege = { 9, 0 };
47 const LUID SeLoadDriverPrivilege = { 10, 0 };
48 const LUID SeSystemProfilePrivilege = { 11, 0 };
49 const LUID SeSystemtimePrivilege = { 12, 0 };
50 const LUID SeProfileSingleProcessPrivilege = { 13, 0 };
51 const LUID SeIncreaseBasePriorityPrivilege = { 14, 0 };
52 const LUID SeCreatePagefilePrivilege = { 15, 0 };
53 const LUID SeBackupPrivilege = { 17, 0 };
54 const LUID SeRestorePrivilege = { 18, 0 };
55 const LUID SeShutdownPrivilege = { 19, 0 };
56 const LUID SeDebugPrivilege = { 20, 0 };
57 const LUID SeSystemEnvironmentPrivilege = { 22, 0 };
58 const LUID SeChangeNotifyPrivilege = { 23, 0 };
59 const LUID SeRemoteShutdownPrivilege = { 24, 0 };
60 const LUID SeUndockPrivilege = { 25, 0 };
61 const LUID SeManageVolumePrivilege = { 28, 0 };
62 const LUID SeImpersonatePrivilege = { 29, 0 };
63 const LUID SeCreateGlobalPrivilege = { 30, 0 };
64
65 #define SID_N(n) struct /* same fields as struct SID */ \
66 { \
67 BYTE Revision; \
68 BYTE SubAuthorityCount; \
69 SID_IDENTIFIER_AUTHORITY IdentifierAuthority; \
70 DWORD SubAuthority[n]; \
71 }
72
73 static const SID world_sid = { SID_REVISION, 1, { SECURITY_WORLD_SID_AUTHORITY }, { SECURITY_WORLD_RID } };
74 static const SID local_sid = { SID_REVISION, 1, { SECURITY_LOCAL_SID_AUTHORITY }, { SECURITY_LOCAL_RID } };
75 static const SID interactive_sid = { SID_REVISION, 1, { SECURITY_NT_AUTHORITY }, { SECURITY_INTERACTIVE_RID } };
76 static const SID anonymous_logon_sid = { SID_REVISION, 1, { SECURITY_NT_AUTHORITY }, { SECURITY_ANONYMOUS_LOGON_RID } };
77 static const SID authenticated_user_sid = { SID_REVISION, 1, { SECURITY_NT_AUTHORITY }, { SECURITY_AUTHENTICATED_USER_RID } };
78 static const SID local_system_sid = { SID_REVISION, 1, { SECURITY_NT_AUTHORITY }, { SECURITY_LOCAL_SYSTEM_RID } };
79 static const SID high_label_sid = { SID_REVISION, 1, { SECURITY_MANDATORY_LABEL_AUTHORITY }, { SECURITY_MANDATORY_HIGH_RID } };
80 static const SID_N(5) local_user_sid = { SID_REVISION, 5, { SECURITY_NT_AUTHORITY }, { SECURITY_NT_NON_UNIQUE, 0, 0, 0, 1000 } };
81 static const SID_N(2) builtin_admins_sid = { SID_REVISION, 2, { SECURITY_NT_AUTHORITY }, { SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS } };
82 static const SID_N(2) builtin_users_sid = { SID_REVISION, 2, { SECURITY_NT_AUTHORITY }, { SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_USERS } };
83 static const SID_N(3) builtin_logon_sid = { SID_REVISION, 3, { SECURITY_NT_AUTHORITY }, { SECURITY_LOGON_IDS_RID, 0, 0 } };
84 static const SID_N(5) domain_users_sid = { SID_REVISION, 5, { SECURITY_NT_AUTHORITY }, { SECURITY_NT_NON_UNIQUE, 0, 0, 0, DOMAIN_GROUP_RID_USERS } };
85
86 const PSID security_world_sid = (PSID)&world_sid;
87 static const PSID security_local_sid = (PSID)&local_sid;
88 static const PSID security_interactive_sid = (PSID)&interactive_sid;
89 static const PSID security_authenticated_user_sid = (PSID)&authenticated_user_sid;
90 const PSID security_local_system_sid = (PSID)&local_system_sid;
91 const PSID security_local_user_sid = (PSID)&local_user_sid;
92 const PSID security_builtin_admins_sid = (PSID)&builtin_admins_sid;
93 const PSID security_builtin_users_sid = (PSID)&builtin_users_sid;
94 const PSID security_domain_users_sid = (PSID)&domain_users_sid;
95 const PSID security_high_label_sid = (PSID)&high_label_sid;
96
97 static luid_t prev_luid_value = { 1000, 0 };
98
99 struct token
100 {
101 struct object obj; /* object header */
102 luid_t token_id; /* system-unique id of token */
103 luid_t modified_id; /* new id allocated every time token is modified */
104 struct list privileges; /* privileges available to the token */
105 struct list groups; /* groups that the user of this token belongs to (sid_and_attributes) */
106 SID *user; /* SID of user this token represents */
107 SID *owner; /* SID of owner (points to user or one of groups) */
108 SID *primary_group; /* SID of user's primary group (points to one of groups) */
109 unsigned primary; /* is this a primary or impersonation token? */
110 ACL *default_dacl; /* the default DACL to assign to objects created by this user */
111 TOKEN_SOURCE source; /* source of the token */
112 int impersonation_level; /* impersonation level this token is capable of if non-primary token */
113 };
114
115 struct privilege
116 {
117 struct list entry;
118 LUID luid;
119 unsigned enabled : 1; /* is the privilege currently enabled? */
120 unsigned def : 1; /* is the privilege enabled by default? */
121 };
122
123 struct group
124 {
125 struct list entry;
126 unsigned enabled : 1; /* is the sid currently enabled? */
127 unsigned def : 1; /* is the sid enabled by default? */
128 unsigned logon : 1; /* is this a logon sid? */
129 unsigned mandatory: 1; /* is this sid always enabled? */
130 unsigned owner : 1; /* can this sid be an owner of an object? */
131 unsigned resource : 1; /* is this a domain-local group? */
132 unsigned deny_only: 1; /* is this a sid that should be use for denying only? */
133 SID sid;
134 };
135
136 static void token_dump( struct object *obj, int verbose );
137 static struct object_type *token_get_type( struct object *obj );
138 static unsigned int token_map_access( struct object *obj, unsigned int access );
139 static void token_destroy( struct object *obj );
140
141 static const struct object_ops token_ops =
142 {
143 sizeof(struct token), /* size */
144 token_dump, /* dump */
145 token_get_type, /* get_type */
146 no_add_queue, /* add_queue */
147 NULL, /* remove_queue */
148 NULL, /* signaled */
149 NULL, /* satisfied */
150 no_signal, /* signal */
151 no_get_fd, /* get_fd */
152 token_map_access, /* map_access */
153 default_get_sd, /* get_sd */
154 default_set_sd, /* set_sd */
155 no_lookup_name, /* lookup_name */
156 no_link_name, /* link_name */
157 NULL, /* unlink_name */
158 no_open_file, /* open_file */
159 no_kernel_obj_list, /* get_kernel_obj_list */
160 no_close_handle, /* close_handle */
161 token_destroy /* destroy */
162 };
163
164 static void token_dump( struct object *obj, int verbose )
165 {
166 struct token *token = (struct token *)obj;
167 assert( obj->ops == &token_ops );
168 fprintf( stderr, "Token id=%d.%u primary=%u impersonation level=%d\n", token->token_id.high_part,
169 token->token_id.low_part, token->primary, token->impersonation_level );
170 }
171
172 static struct object_type *token_get_type( struct object *obj )
173 {
174 static const WCHAR name[] = {'T','o','k','e','n'};
175 static const struct unicode_str str = { name, sizeof(name) };
176 return get_object_type( &str );
177 }
178
179 static unsigned int token_map_access( struct object *obj, unsigned int access )
180 {
181 if (access & GENERIC_READ) access |= TOKEN_READ;
182 if (access & GENERIC_WRITE) access |= TOKEN_WRITE;
183 if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
184 if (access & GENERIC_ALL) access |= TOKEN_ALL_ACCESS;
185 return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
186 }
187
188 static SID *security_sid_alloc( const SID_IDENTIFIER_AUTHORITY *idauthority, int subauthcount, const unsigned int subauth[] )
189 {
190 int i;
191 SID *sid = mem_alloc( FIELD_OFFSET(SID, SubAuthority[subauthcount]) );
192 if (!sid) return NULL;
193 sid->Revision = SID_REVISION;
194 sid->SubAuthorityCount = subauthcount;
195 sid->IdentifierAuthority = *idauthority;
196 for (i = 0; i < subauthcount; i++)
197 sid->SubAuthority[i] = subauth[i];
198 return sid;
199 }
200
201 void security_set_thread_token( struct thread *thread, obj_handle_t handle )
202 {
203 if (!handle)
204 {
205 if (thread->token)
206 release_object( thread->token );
207 thread->token = NULL;
208 }
209 else
210 {
211 struct token *token = (struct token *)get_handle_obj( current->process,
212 handle,
213 TOKEN_IMPERSONATE,
214 &token_ops );
215 if (token)
216 {
217 if (thread->token)
218 release_object( thread->token );
219 thread->token = token;
220 }
221 }
222 }
223
224 const SID *security_unix_uid_to_sid( uid_t uid )
225 {
226 /* very simple mapping: either the current user or not the current user */
227 if (uid == getuid())
228 return (const SID *)&local_user_sid;
229 else
230 return &anonymous_logon_sid;
231 }
232
233 static int acl_is_valid( const ACL *acl, data_size_t size )
234 {
235 ULONG i;
236 const ACE_HEADER *ace;
237
238 if (size < sizeof(ACL))
239 return FALSE;
240
241 size = min(size, MAX_ACL_LEN);
242
243 size -= sizeof(ACL);
244
245 ace = (const ACE_HEADER *)(acl + 1);
246 for (i = 0; i < acl->AceCount; i++)
247 {
248 const SID *sid;
249 data_size_t sid_size;
250
251 if (size < sizeof(ACE_HEADER))
252 return FALSE;
253 if (size < ace->AceSize)
254 return FALSE;
255 size -= ace->AceSize;
256 switch (ace->AceType)
257 {
258 case ACCESS_DENIED_ACE_TYPE:
259 sid = (const SID *)&((const ACCESS_DENIED_ACE *)ace)->SidStart;
260 sid_size = ace->AceSize - FIELD_OFFSET(ACCESS_DENIED_ACE, SidStart);
261 break;
262 case ACCESS_ALLOWED_ACE_TYPE:
263 sid = (const SID *)&((const ACCESS_ALLOWED_ACE *)ace)->SidStart;
264 sid_size = ace->AceSize - FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart);
265 break;
266 case SYSTEM_AUDIT_ACE_TYPE:
267 sid = (const SID *)&((const SYSTEM_AUDIT_ACE *)ace)->SidStart;
268 sid_size = ace->AceSize - FIELD_OFFSET(SYSTEM_AUDIT_ACE, SidStart);
269 break;
270 case SYSTEM_ALARM_ACE_TYPE:
271 sid = (const SID *)&((const SYSTEM_ALARM_ACE *)ace)->SidStart;
272 sid_size = ace->AceSize - FIELD_OFFSET(SYSTEM_ALARM_ACE, SidStart);
273 break;
274 case SYSTEM_MANDATORY_LABEL_ACE_TYPE:
275 sid = (const SID *)&((const SYSTEM_MANDATORY_LABEL_ACE *)ace)->SidStart;
276 sid_size = ace->AceSize - FIELD_OFFSET(SYSTEM_MANDATORY_LABEL_ACE, SidStart);
277 break;
278 default:
279 return FALSE;
280 }
281 if (sid_size < FIELD_OFFSET(SID, SubAuthority[0]) || sid_size < security_sid_len( sid ))
282 return FALSE;
283 ace = ace_next( ace );
284 }
285 return TRUE;
286 }
287
288 /* checks whether all members of a security descriptor fit inside the size
289 * of memory specified */
290 int sd_is_valid( const struct security_descriptor *sd, data_size_t size )
291 {
292 size_t offset = sizeof(struct security_descriptor);
293 const SID *group;
294 const SID *owner;
295 const ACL *sacl;
296 const ACL *dacl;
297 int dummy;
298
299 if (size < offset)
300 return FALSE;
301
302 if ((sd->owner_len >= FIELD_OFFSET(SID, SubAuthority[255])) ||
303 (offset + sd->owner_len > size))
304 return FALSE;
305 owner = sd_get_owner( sd );
306 if (owner)
307 {
308 if ((sd->owner_len < sizeof(SID)) || (security_sid_len( owner ) > sd->owner_len))
309 return FALSE;
310 }
311 offset += sd->owner_len;
312
313 if ((sd->group_len >= FIELD_OFFSET(SID, SubAuthority[255])) ||
314 (offset + sd->group_len > size))
315 return FALSE;
316 group = sd_get_group( sd );
317 if (group)
318 {
319 if ((sd->group_len < sizeof(SID)) || (security_sid_len( group ) > sd->group_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 /* extract security labels from SACL */
342 ACL *extract_security_labels( const ACL *sacl )
343 {
344 size_t size = sizeof(ACL);
345 const ACE_HEADER *ace;
346 ACE_HEADER *label_ace;
347 unsigned int i, count = 0;
348 ACL *label_acl;
349
350 ace = (const ACE_HEADER *)(sacl + 1);
351 for (i = 0; i < sacl->AceCount; i++, ace = ace_next( ace ))
352 {
353 if (ace->AceType == SYSTEM_MANDATORY_LABEL_ACE_TYPE)
354 {
355 size += ace->AceSize;
356 count++;
357 }
358 }
359
360 label_acl = mem_alloc( size );
361 if (!label_acl) return NULL;
362
363 label_acl->AclRevision = sacl->AclRevision;
364 label_acl->Sbz1 = 0;
365 label_acl->AclSize = size;
366 label_acl->AceCount = count;
367 label_acl->Sbz2 = 0;
368 label_ace = (ACE_HEADER *)(label_acl + 1);
369
370 ace = (const ACE_HEADER *)(sacl + 1);
371 for (i = 0; i < sacl->AceCount; i++, ace = ace_next( ace ))
372 {
373 if (ace->AceType == SYSTEM_MANDATORY_LABEL_ACE_TYPE)
374 {
375 memcpy( label_ace, ace, ace->AceSize );
376 label_ace = (ACE_HEADER *)ace_next( label_ace );
377 }
378 }
379 return label_acl;
380 }
381
382 /* replace security labels in an existing SACL */
383 ACL *replace_security_labels( const ACL *old_sacl, const ACL *new_sacl )
384 {
385 const ACE_HEADER *ace;
386 ACE_HEADER *replaced_ace;
387 size_t size = sizeof(ACL);
388 unsigned int i, count = 0;
389 BYTE revision = ACL_REVISION;
390 ACL *replaced_acl;
391
392 if (old_sacl)
393 {
394 revision = max( revision, old_sacl->AclRevision );
395 ace = (const ACE_HEADER *)(old_sacl + 1);
396 for (i = 0; i < old_sacl->AceCount; i++, ace = ace_next( ace ))
397 {
398 if (ace->AceType == SYSTEM_MANDATORY_LABEL_ACE_TYPE) continue;
399 size += ace->AceSize;
400 count++;
401 }
402 }
403
404 if (new_sacl)
405 {
406 revision = max( revision, new_sacl->AclRevision );
407 ace = (const ACE_HEADER *)(new_sacl + 1);
408 for (i = 0; i < new_sacl->AceCount; i++, ace = ace_next( ace ))
409 {
410 if (ace->AceType != SYSTEM_MANDATORY_LABEL_ACE_TYPE) continue;
411 size += ace->AceSize;
412 count++;
413 }
414 }
415
416 replaced_acl = mem_alloc( size );
417 if (!replaced_acl) return NULL;
418
419 replaced_acl->AclRevision = revision;
420 replaced_acl->Sbz1 = 0;
421 replaced_acl->AclSize = size;
422 replaced_acl->AceCount = count;
423 replaced_acl->Sbz2 = 0;
424 replaced_ace = (ACE_HEADER *)(replaced_acl + 1);
425
426 if (old_sacl)
427 {
428 ace = (const ACE_HEADER *)(old_sacl + 1);
429 for (i = 0; i < old_sacl->AceCount; i++, ace = ace_next( ace ))
430 {
431 if (ace->AceType == SYSTEM_MANDATORY_LABEL_ACE_TYPE) continue;
432 memcpy( replaced_ace, ace, ace->AceSize );
433 replaced_ace = (ACE_HEADER *)ace_next( replaced_ace );
434 }
435 }
436
437 if (new_sacl)
438 {
439 ace = (const ACE_HEADER *)(new_sacl + 1);
440 for (i = 0; i < new_sacl->AceCount; i++, ace = ace_next( ace ))
441 {
442 if (ace->AceType != SYSTEM_MANDATORY_LABEL_ACE_TYPE) continue;
443 memcpy( replaced_ace, ace, ace->AceSize );
444 replaced_ace = (ACE_HEADER *)ace_next( replaced_ace );
445 }
446 }
447
448 return replaced_acl;
449 }
450
451 /* maps from generic rights to specific rights as given by a mapping */
452 static inline void map_generic_mask(unsigned int *mask, const GENERIC_MAPPING *mapping)
453 {
454 if (*mask & GENERIC_READ) *mask |= mapping->GenericRead;
455 if (*mask & GENERIC_WRITE) *mask |= mapping->GenericWrite;
456 if (*mask & GENERIC_EXECUTE) *mask |= mapping->GenericExecute;
457 if (*mask & GENERIC_ALL) *mask |= mapping->GenericAll;
458 *mask &= 0x0FFFFFFF;
459 }
460
461 static inline int is_equal_luid( const LUID *luid1, const LUID *luid2 )
462 {
463 return (luid1->LowPart == luid2->LowPart && luid1->HighPart == luid2->HighPart);
464 }
465
466 static inline void allocate_luid( luid_t *luid )
467 {
468 prev_luid_value.low_part++;
469 *luid = prev_luid_value;
470 }
471
472 DECL_HANDLER( allocate_locally_unique_id )
473 {
474 allocate_luid( &reply->luid );
475 }
476
477 static inline void luid_and_attr_from_privilege( LUID_AND_ATTRIBUTES *out, const struct privilege *in)
478 {
479 out->Luid = in->luid;
480 out->Attributes =
481 (in->enabled ? SE_PRIVILEGE_ENABLED : 0) |
482 (in->def ? SE_PRIVILEGE_ENABLED_BY_DEFAULT : 0);
483 }
484
485 static struct privilege *privilege_add( struct token *token, const LUID *luid, int enabled )
486 {
487 struct privilege *privilege = mem_alloc( sizeof(*privilege) );
488 if (privilege)
489 {
490 privilege->luid = *luid;
491 privilege->def = privilege->enabled = (enabled != 0);
492 list_add_tail( &token->privileges, &privilege->entry );
493 }
494 return privilege;
495 }
496
497 static inline void privilege_remove( struct privilege *privilege )
498 {
499 list_remove( &privilege->entry );
500 free( privilege );
501 }
502
503 static void token_destroy( struct object *obj )
504 {
505 struct token* token;
506 struct list *cursor, *cursor_next;
507
508 assert( obj->ops == &token_ops );
509 token = (struct token *)obj;
510
511 free( token->user );
512
513 LIST_FOR_EACH_SAFE( cursor, cursor_next, &token->privileges )
514 {
515 struct privilege *privilege = LIST_ENTRY( cursor, struct privilege, entry );
516 privilege_remove( privilege );
517 }
518
519 LIST_FOR_EACH_SAFE( cursor, cursor_next, &token->groups )
520 {
521 struct group *group = LIST_ENTRY( cursor, struct group, entry );
522 list_remove( &group->entry );
523 free( group );
524 }
525
526 free( token->default_dacl );
527 }
528
529 /* creates a new token.
530 * groups may be NULL if group_count is 0.
531 * privs may be NULL if priv_count is 0.
532 * default_dacl may be NULL, indicating that all objects created by the user
533 * are unsecured.
534 * modified_id may be NULL, indicating that a new modified_id luid should be
535 * allocated.
536 */
537 static struct token *create_token( unsigned primary, const SID *user,
538 const SID_AND_ATTRIBUTES *groups, unsigned int group_count,
539 const LUID_AND_ATTRIBUTES *privs, unsigned int priv_count,
540 const ACL *default_dacl, TOKEN_SOURCE source,
541 const luid_t *modified_id,
542 int impersonation_level )
543 {
544 struct token *token = alloc_object( &token_ops );
545 if (token)
546 {
547 unsigned int i;
548
549 allocate_luid( &token->token_id );
550 if (modified_id)
551 token->modified_id = *modified_id;
552 else
553 allocate_luid( &token->modified_id );
554 list_init( &token->privileges );
555 list_init( &token->groups );
556 token->primary = primary;
557 /* primary tokens don't have impersonation levels */
558 if (primary)
559 token->impersonation_level = -1;
560 else
561 token->impersonation_level = impersonation_level;
562 token->default_dacl = NULL;
563 token->primary_group = NULL;
564
565 /* copy user */
566 token->user = memdup( user, security_sid_len( user ));
567 if (!token->user)
568 {
569 release_object( token );
570 return NULL;
571 }
572
573 /* copy groups */
574 for (i = 0; i < group_count; i++)
575 {
576 size_t size = FIELD_OFFSET( struct group, sid.SubAuthority[((const SID *)groups[i].Sid)->SubAuthorityCount] );
577 struct group *group = mem_alloc( size );
578
579 if (!group)
580 {
581 release_object( token );
582 return NULL;
583 }
584 memcpy( &group->sid, groups[i].Sid, security_sid_len( groups[i].Sid ));
585 group->enabled = TRUE;
586 group->def = TRUE;
587 group->logon = (groups[i].Attributes & SE_GROUP_LOGON_ID) != 0;
588 group->mandatory = (groups[i].Attributes & SE_GROUP_MANDATORY) != 0;
589 group->owner = (groups[i].Attributes & SE_GROUP_OWNER) != 0;
590 group->resource = FALSE;
591 group->deny_only = FALSE;
592 list_add_tail( &token->groups, &group->entry );
593 /* Use first owner capable group as owner and primary group */
594 if (!token->primary_group && group->owner)
595 {
596 token->owner = &group->sid;
597 token->primary_group = &group->sid;
598 }
599 }
600
601 /* copy privileges */
602 for (i = 0; i < priv_count; i++)
603 {
604 /* note: we don't check uniqueness: the caller must make sure
605 * privs doesn't contain any duplicate luids */
606 if (!privilege_add( token, &privs[i].Luid,
607 privs[i].Attributes & SE_PRIVILEGE_ENABLED ))
608 {
609 release_object( token );
610 return NULL;
611 }
612 }
613
614 if (default_dacl)
615 {
616 token->default_dacl = memdup( default_dacl, default_dacl->AclSize );
617 if (!token->default_dacl)
618 {
619 release_object( token );
620 return NULL;
621 }
622 }
623
624 token->source = source;
625 }
626 return token;
627 }
628
629 struct token *token_duplicate( struct token *src_token, unsigned primary,
630 int impersonation_level, const struct security_descriptor *sd )
631 {
632 const luid_t *modified_id =
633 primary || (impersonation_level == src_token->impersonation_level) ?
634 &src_token->modified_id : NULL;
635 struct token *token = NULL;
636 struct privilege *privilege;
637 struct group *group;
638
639 if (!primary &&
640 (impersonation_level < SecurityAnonymous ||
641 impersonation_level > SecurityDelegation ||
642 (!src_token->primary && (impersonation_level > src_token->impersonation_level))))
643 {
644 set_error( STATUS_BAD_IMPERSONATION_LEVEL );
645 return NULL;
646 }
647
648 token = create_token( primary, src_token->user, NULL, 0,
649 NULL, 0, src_token->default_dacl,
650 src_token->source, modified_id,
651 impersonation_level );
652 if (!token) return token;
653
654 /* copy groups */
655 token->primary_group = NULL;
656 LIST_FOR_EACH_ENTRY( group, &src_token->groups, struct group, entry )
657 {
658 size_t size = FIELD_OFFSET( struct group, sid.SubAuthority[group->sid.SubAuthorityCount] );
659 struct group *newgroup = mem_alloc( size );
660 if (!newgroup)
661 {
662 release_object( token );
663 return NULL;
664 }
665 memcpy( newgroup, group, size );
666 list_add_tail( &token->groups, &newgroup->entry );
667 if (src_token->primary_group == &group->sid)
668 {
669 token->owner = &newgroup->sid;
670 token->primary_group = &newgroup->sid;
671 }
672 }
673 assert( token->primary_group );
674
675 /* copy privileges */
676 LIST_FOR_EACH_ENTRY( privilege, &src_token->privileges, struct privilege, entry )
677 if (!privilege_add( token, &privilege->luid, privilege->enabled ))
678 {
679 release_object( token );
680 return NULL;
681 }
682
683 if (sd) default_set_sd( &token->obj, sd, OWNER_SECURITY_INFORMATION | GROUP_SECURITY_INFORMATION |
684 DACL_SECURITY_INFORMATION | SACL_SECURITY_INFORMATION );
685
686 return token;
687 }
688
689 static ACL *create_default_dacl( const SID *user )
690 {
691 ACCESS_ALLOWED_ACE *aaa;
692 ACL *default_dacl;
693 SID *sid;
694 size_t default_dacl_size = sizeof(ACL) +
695 2*(sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD)) +
696 sizeof(local_system_sid) +
697 security_sid_len( user );
698
699 default_dacl = mem_alloc( default_dacl_size );
700 if (!default_dacl) return NULL;
701
702 default_dacl->AclRevision = ACL_REVISION;
703 default_dacl->Sbz1 = 0;
704 default_dacl->AclSize = default_dacl_size;
705 default_dacl->AceCount = 2;
706 default_dacl->Sbz2 = 0;
707
708 /* GENERIC_ALL for Local System */
709 aaa = (ACCESS_ALLOWED_ACE *)(default_dacl + 1);
710 aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
711 aaa->Header.AceFlags = 0;
712 aaa->Header.AceSize = (sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD)) +
713 sizeof(local_system_sid);
714 aaa->Mask = GENERIC_ALL;
715 sid = (SID *)&aaa->SidStart;
716 memcpy( sid, &local_system_sid, sizeof(local_system_sid) );
717
718 /* GENERIC_ALL for specified user */
719 aaa = (ACCESS_ALLOWED_ACE *)((char *)aaa + aaa->Header.AceSize);
720 aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
721 aaa->Header.AceFlags = 0;
722 aaa->Header.AceSize = (sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD)) + security_sid_len( user );
723 aaa->Mask = GENERIC_ALL;
724 sid = (SID *)&aaa->SidStart;
725 memcpy( sid, user, security_sid_len( user ));
726
727 return default_dacl;
728 }
729
730 struct sid_data
731 {
732 SID_IDENTIFIER_AUTHORITY idauth;
733 int count;
734 unsigned int subauth[MAX_SUBAUTH_COUNT];
735 };
736
737 static struct security_descriptor *create_security_label_sd( struct token *token, PSID label_sid )
738 {
739 size_t sid_len = security_sid_len( label_sid ), sacl_size, sd_size;
740 SYSTEM_MANDATORY_LABEL_ACE *smla;
741 struct security_descriptor *sd;
742 ACL *sacl;
743
744 sacl_size = sizeof(ACL) + FIELD_OFFSET(SYSTEM_MANDATORY_LABEL_ACE, SidStart) + sid_len;
745 sd_size = sizeof(struct security_descriptor) + sacl_size;
746 if (!(sd = mem_alloc( sd_size )))
747 return NULL;
748
749 sd->control = SE_SACL_PRESENT;
750 sd->owner_len = 0;
751 sd->group_len = 0;
752 sd->sacl_len = sacl_size;
753 sd->dacl_len = 0;
754
755 sacl = (ACL *)(sd + 1);
756 sacl->AclRevision = ACL_REVISION;
757 sacl->Sbz1 = 0;
758 sacl->AclSize = sacl_size;
759 sacl->AceCount = 1;
760 sacl->Sbz2 = 0;
761
762 smla = (SYSTEM_MANDATORY_LABEL_ACE *)(sacl + 1);
763 smla->Header.AceType = SYSTEM_MANDATORY_LABEL_ACE_TYPE;
764 smla->Header.AceFlags = 0;
765 smla->Header.AceSize = FIELD_OFFSET(SYSTEM_MANDATORY_LABEL_ACE, SidStart) + sid_len;
766 smla->Mask = SYSTEM_MANDATORY_LABEL_NO_WRITE_UP;
767 memcpy( &smla->SidStart, label_sid, sid_len );
768
769 assert( sd_is_valid( sd, sd_size ) );
770 return sd;
771 }
772
773 int token_assign_label( struct token *token, PSID label )
774 {
775 struct security_descriptor *sd;
776 int ret = 0;
777
778 if ((sd = create_security_label_sd( token, label )))
779 {
780 ret = set_sd_defaults_from_token( &token->obj, sd, LABEL_SECURITY_INFORMATION, token );
781 free( sd );
782 }
783
784 return ret;
785 }
786
787 struct token *token_create_admin( void )
788 {
789 struct token *token = NULL;
790 static const SID_IDENTIFIER_AUTHORITY nt_authority = { SECURITY_NT_AUTHORITY };
791 static const unsigned int alias_admins_subauth[] = { SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS };
792 static const unsigned int alias_users_subauth[] = { SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_USERS };
793 /* on Windows, this value changes every time the user logs on */
794 static const unsigned int logon_subauth[] = { SECURITY_LOGON_IDS_RID, 0, 1 /* FIXME: should be randomly generated when tokens are inherited by new processes */ };
795 PSID alias_admins_sid;
796 PSID alias_users_sid;
797 PSID logon_sid;
798 const SID *user_sid = security_unix_uid_to_sid( getuid() );
799 ACL *default_dacl = create_default_dacl( user_sid );
800
801 alias_admins_sid = security_sid_alloc( &nt_authority, ARRAY_SIZE( alias_admins_subauth ),
802 alias_admins_subauth );
803 alias_users_sid = security_sid_alloc( &nt_authority, ARRAY_SIZE( alias_users_subauth ),
804 alias_users_subauth );
805 logon_sid = security_sid_alloc( &nt_authority, ARRAY_SIZE( logon_subauth ), logon_subauth );
806
807 if (alias_admins_sid && alias_users_sid && logon_sid && default_dacl)
808 {
809 const LUID_AND_ATTRIBUTES admin_privs[] =
810 {
811 { SeChangeNotifyPrivilege , SE_PRIVILEGE_ENABLED },
812 { SeSecurityPrivilege , 0 },
813 { SeBackupPrivilege , 0 },
814 { SeRestorePrivilege , 0 },
815 { SeSystemtimePrivilege , 0 },
816 { SeShutdownPrivilege , 0 },
817 { SeRemoteShutdownPrivilege , 0 },
818 { SeTakeOwnershipPrivilege , 0 },
819 { SeDebugPrivilege , 0 },
820 { SeSystemEnvironmentPrivilege , 0 },
821 { SeSystemProfilePrivilege , 0 },
822 { SeProfileSingleProcessPrivilege, 0 },
823 { SeIncreaseBasePriorityPrivilege, 0 },
824 { SeLoadDriverPrivilege , SE_PRIVILEGE_ENABLED },
825 { SeCreatePagefilePrivilege , 0 },
826 { SeIncreaseQuotaPrivilege , 0 },
827 { SeUndockPrivilege , 0 },
828 { SeManageVolumePrivilege , 0 },
829 { SeImpersonatePrivilege , SE_PRIVILEGE_ENABLED },
830 { SeCreateGlobalPrivilege , SE_PRIVILEGE_ENABLED },
831 };
832 /* note: we don't include non-builtin groups here for the user -
833 * telling us these is the job of a client-side program */
834 const SID_AND_ATTRIBUTES admin_groups[] =
835 {
836 { security_world_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
837 { security_local_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
838 { security_interactive_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
839 { security_authenticated_user_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
840 { security_domain_users_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY|SE_GROUP_OWNER },
841 { alias_admins_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY|SE_GROUP_OWNER },
842 { alias_users_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
843 { logon_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY|SE_GROUP_LOGON_ID },
844 };
845 static const TOKEN_SOURCE admin_source = {"SeMgr", {0, 0}};
846 token = create_token( TRUE, user_sid, admin_groups, ARRAY_SIZE( admin_groups ),
847 admin_privs, ARRAY_SIZE( admin_privs ), default_dacl,
848 admin_source, NULL, -1 );
849 /* we really need a primary group */
850 assert( token->primary_group );
851 }
852
853 free( logon_sid );
854 free( alias_admins_sid );
855 free( alias_users_sid );
856 free( default_dacl );
857
858 return token;
859 }
860
861 static struct privilege *token_find_privilege( struct token *token, const LUID *luid, int enabled_only )
862 {
863 struct privilege *privilege;
864 LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
865 {
866 if (is_equal_luid( luid, &privilege->luid ))
867 {
868 if (enabled_only && !privilege->enabled)
869 return NULL;
870 return privilege;
871 }
872 }
873 return NULL;
874 }
875
876 static unsigned int token_adjust_privileges( struct token *token, const LUID_AND_ATTRIBUTES *privs,
877 unsigned int count, LUID_AND_ATTRIBUTES *mod_privs,
878 unsigned int mod_privs_count )
879 {
880 unsigned int i, modified_count = 0;
881
882 /* mark as modified */
883 allocate_luid( &token->modified_id );
884
885 for (i = 0; i < count; i++)
886 {
887 struct privilege *privilege =
888 token_find_privilege( token, &privs[i].Luid, FALSE );
889 if (!privilege)
890 {
891 set_error( STATUS_NOT_ALL_ASSIGNED );
892 continue;
893 }
894
895 if (privs[i].Attributes & SE_PRIVILEGE_REMOVED)
896 privilege_remove( privilege );
897 else
898 {
899 /* save previous state for caller */
900 if (mod_privs_count)
901 {
902 luid_and_attr_from_privilege(mod_privs, privilege);
903 mod_privs++;
904 mod_privs_count--;
905 modified_count++;
906 }
907
908 if (privs[i].Attributes & SE_PRIVILEGE_ENABLED)
909 privilege->enabled = TRUE;
910 else
911 privilege->enabled = FALSE;
912 }
913 }
914 return modified_count;
915 }
916
917 static void token_disable_privileges( struct token *token )
918 {
919 struct privilege *privilege;
920
921 /* mark as modified */
922 allocate_luid( &token->modified_id );
923
924 LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
925 privilege->enabled = FALSE;
926 }
927
928 int token_check_privileges( struct token *token, int all_required,
929 const LUID_AND_ATTRIBUTES *reqprivs,
930 unsigned int count, LUID_AND_ATTRIBUTES *usedprivs)
931 {
932 unsigned int i, enabled_count = 0;
933
934 for (i = 0; i < count; i++)
935 {
936 struct privilege *privilege =
937 token_find_privilege( token, &reqprivs[i].Luid, TRUE );
938
939 if (usedprivs)
940 usedprivs[i] = reqprivs[i];
941
942 if (privilege && privilege->enabled)
943 {
944 enabled_count++;
945 if (usedprivs)
946 usedprivs[i].Attributes |= SE_PRIVILEGE_USED_FOR_ACCESS;
947 }
948 }
949
950 if (all_required)
951 return (enabled_count == count);
952 else
953 return (enabled_count > 0);
954 }
955
956 int token_sid_present( struct token *token, const SID *sid, int deny )
957 {
958 struct group *group;
959
960 if (security_equal_sid( token->user, sid )) return TRUE;
961
962 LIST_FOR_EACH_ENTRY( group, &token->groups, struct group, entry )
963 {
964 if (!group->enabled) continue;
965 if (group->deny_only && !deny) continue;
966
967 if (security_equal_sid( &group->sid, sid )) return TRUE;
968 }
969
970 return FALSE;
971 }
972
973 /* Checks access to a security descriptor. 'sd' must have been validated by
974 * caller. It returns STATUS_SUCCESS if call succeeded or an error indicating
975 * the reason. 'status' parameter will indicate if access is granted or denied.
976 *
977 * If both returned value and 'status' are STATUS_SUCCESS then access is granted.
978 */
979 static unsigned int token_access_check( struct token *token,
980 const struct security_descriptor *sd,
981 unsigned int desired_access,
982 LUID_AND_ATTRIBUTES *privs,
983 unsigned int *priv_count,
984 const GENERIC_MAPPING *mapping,
985 unsigned int *granted_access,
986 unsigned int *status )
987 {
988 unsigned int current_access = 0;
989 unsigned int denied_access = 0;
990 ULONG i;
991 const ACL *dacl;
992 int dacl_present;
993 const ACE_HEADER *ace;
994 const SID *owner;
995
996 /* assume no access rights */
997 *granted_access = 0;
998
999 /* fail if desired_access contains generic rights */
1000 if (desired_access & (GENERIC_READ|GENERIC_WRITE|GENERIC_EXECUTE|GENERIC_ALL))
1001 {
1002 if (priv_count) *priv_count = 0;
1003 return STATUS_GENERIC_NOT_MAPPED;
1004 }
1005
1006 dacl = sd_get_dacl( sd, &dacl_present );
1007 owner = sd_get_owner( sd );
1008 if (!owner || !sd_get_group( sd ))
1009 {
1010 if (priv_count) *priv_count = 0;
1011 return STATUS_INVALID_SECURITY_DESCR;
1012 }
1013
1014 /* 1: Grant desired access if the object is unprotected */
1015 if (!dacl_present || !dacl)
1016 {
1017 if (priv_count) *priv_count = 0;
1018 if (desired_access & MAXIMUM_ALLOWED)
1019 *granted_access = mapping->GenericAll;
1020 else
1021 *granted_access = desired_access;
1022 return *status = STATUS_SUCCESS;
1023 }
1024
1025 /* 2: Check if caller wants access to system security part. Note: access
1026 * is only granted if specifically asked for */
1027 if (desired_access & ACCESS_SYSTEM_SECURITY)
1028 {
1029 const LUID_AND_ATTRIBUTES security_priv = { SeSecurityPrivilege, 0 };
1030 LUID_AND_ATTRIBUTES retpriv = security_priv;
1031 if (token_check_privileges( token, TRUE, &security_priv, 1, &retpriv ))
1032 {
1033 if (priv_count)
1034 {
1035 /* assumes that there will only be one privilege to return */
1036 if (*priv_count >= 1)
1037 {
1038 *priv_count = 1;
1039 *privs = retpriv;
1040 }
1041 else
1042 {
1043 *priv_count = 1;
1044 return STATUS_BUFFER_TOO_SMALL;
1045 }
1046 }
1047 current_access |= ACCESS_SYSTEM_SECURITY;
1048 if (desired_access == current_access)
1049 {
1050 *granted_access = current_access;
1051 return *status = STATUS_SUCCESS;
1052 }
1053 }
1054 else
1055 {
1056 if (priv_count) *priv_count = 0;
1057 *status = STATUS_PRIVILEGE_NOT_HELD;
1058 return STATUS_SUCCESS;
1059 }
1060 }
1061 else if (priv_count) *priv_count = 0;
1062
1063 /* 3: Check whether the token is the owner */
1064 /* NOTE: SeTakeOwnershipPrivilege is not checked for here - it is instead
1065 * checked when a "set owner" call is made, overriding the access rights
1066 * determined here. */
1067 if (token_sid_present( token, owner, FALSE ))
1068 {
1069 current_access |= (READ_CONTROL | WRITE_DAC);
1070 if (desired_access == current_access)
1071 {
1072 *granted_access = current_access;
1073 return *status = STATUS_SUCCESS;
1074 }
1075 }
1076
1077 /* 4: Grant rights according to the DACL */
1078 ace = (const ACE_HEADER *)(dacl + 1);
1079 for (i = 0; i < dacl->AceCount; i++, ace = ace_next( ace ))
1080 {
1081 const ACCESS_ALLOWED_ACE *aa_ace;
1082 const ACCESS_DENIED_ACE *ad_ace;
1083 const SID *sid;
1084
1085 if (ace->AceFlags & INHERIT_ONLY_ACE)
1086 continue;
1087
1088 switch (ace->AceType)
1089 {
1090 case ACCESS_DENIED_ACE_TYPE:
1091 ad_ace = (const ACCESS_DENIED_ACE *)ace;
1092 sid = (const SID *)&ad_ace->SidStart;
1093 if (token_sid_present( token, sid, TRUE ))
1094 {
1095 unsigned int access = ad_ace->Mask;
1096 map_generic_mask(&access, mapping);
1097 if (desired_access & MAXIMUM_ALLOWED)
1098 denied_access |= access;
1099 else
1100 {
1101 denied_access |= (access & ~current_access);
1102 if (desired_access & access) goto done;
1103 }
1104 }
1105 break;
1106 case ACCESS_ALLOWED_ACE_TYPE:
1107 aa_ace = (const ACCESS_ALLOWED_ACE *)ace;
1108 sid = (const SID *)&aa_ace->SidStart;
1109 if (token_sid_present( token, sid, FALSE ))
1110 {
1111 unsigned int access = aa_ace->Mask;
1112 map_generic_mask(&access, mapping);
1113 if (desired_access & MAXIMUM_ALLOWED)
1114 current_access |= access;
1115 else
1116 current_access |= (access & ~denied_access);
1117 }
1118 break;
1119 }
1120
1121 /* don't bother carrying on checking if we've already got all of
1122 * rights we need */
1123 if (desired_access == *granted_access)
1124 break;
1125 }
1126
1127 done:
1128 if (desired_access & MAXIMUM_ALLOWED)
1129 *granted_access = current_access & ~denied_access;
1130 else
1131 if ((current_access & desired_access) == desired_access)
1132 *granted_access = current_access & desired_access;
1133 else
1134 *granted_access = 0;
1135
1136 *status = *granted_access ? STATUS_SUCCESS : STATUS_ACCESS_DENIED;
1137 return STATUS_SUCCESS;
1138 }
1139
1140 const ACL *token_get_default_dacl( struct token *token )
1141 {
1142 return token->default_dacl;
1143 }
1144
1145 const SID *token_get_user( struct token *token )
1146 {
1147 return token->user;
1148 }
1149
1150 const SID *token_get_primary_group( struct token *token )
1151 {
1152 return token->primary_group;
1153 }
1154
1155 int check_object_access(struct object *obj, unsigned int *access)
1156 {
1157 GENERIC_MAPPING mapping;
1158 struct token *token = current->token ? current->token : current->process->token;
1159 unsigned int status;
1160 int res;
1161
1162 mapping.GenericAll = obj->ops->map_access( obj, GENERIC_ALL );
1163
1164 if (!obj->sd)
1165 {
1166 if (*access & MAXIMUM_ALLOWED)
1167 *access = mapping.GenericAll;
1168 return TRUE;
1169 }
1170
1171 mapping.GenericRead = obj->ops->map_access( obj, GENERIC_READ );
1172 mapping.GenericWrite = obj->ops->map_access( obj, GENERIC_WRITE );
1173 mapping.GenericExecute = obj->ops->map_access( obj, GENERIC_EXECUTE );
1174
1175 res = token_access_check( token, obj->sd, *access, NULL, NULL,
1176 &mapping, access, &status ) == STATUS_SUCCESS &&
1177 status == STATUS_SUCCESS;
1178
1179 if (!res) set_error( STATUS_ACCESS_DENIED );
1180 return res;
1181 }
1182
1183
1184 /* open a security token */
1185 DECL_HANDLER(open_token)
1186 {
1187 if (req->flags & OPEN_TOKEN_THREAD)
1188 {
1189 struct thread *thread = get_thread_from_handle( req->handle, 0 );
1190 if (thread)
1191 {
1192 if (thread->token)
1193 {
1194 if (!thread->token->primary && thread->token->impersonation_level <= SecurityAnonymous)
1195 set_error( STATUS_CANT_OPEN_ANONYMOUS );
1196 else
1197 reply->token = alloc_handle( current->process, thread->token,
1198 req->access, req->attributes );
1199 }
1200 else
1201 set_error( STATUS_NO_TOKEN );
1202 release_object( thread );
1203 }
1204 }
1205 else
1206 {
1207 struct process *process = get_process_from_handle( req->handle, 0 );
1208 if (process)
1209 {
1210 if (process->token)
1211 reply->token = alloc_handle( current->process, process->token, req->access,
1212 req->attributes );
1213 else
1214 set_error( STATUS_NO_TOKEN );
1215 release_object( process );
1216 }
1217 }
1218 }
1219
1220 /* adjust the privileges held by a token */
1221 DECL_HANDLER(adjust_token_privileges)
1222 {
1223 struct token *token;
1224 unsigned int access = TOKEN_ADJUST_PRIVILEGES;
1225
1226 if (req->get_modified_state) access |= TOKEN_QUERY;
1227
1228 if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1229 access, &token_ops )))
1230 {
1231 const LUID_AND_ATTRIBUTES *privs = get_req_data();
1232 LUID_AND_ATTRIBUTES *modified_privs = NULL;
1233 unsigned int priv_count = get_req_data_size() / sizeof(LUID_AND_ATTRIBUTES);
1234 unsigned int modified_priv_count = 0;
1235
1236 if (req->get_modified_state && !req->disable_all)
1237 {
1238 unsigned int i;
1239 /* count modified privs */
1240 for (i = 0; i < priv_count; i++)
1241 {
1242 struct privilege *privilege =
1243 token_find_privilege( token, &privs[i].Luid, FALSE );
1244 if (privilege && req->get_modified_state)
1245 modified_priv_count++;
1246 }
1247 reply->len = modified_priv_count;
1248 modified_priv_count = min( modified_priv_count, get_reply_max_size() / sizeof(*modified_privs) );
1249 if (modified_priv_count)
1250 modified_privs = set_reply_data_size( modified_priv_count * sizeof(*modified_privs) );
1251 }
1252 reply->len = modified_priv_count * sizeof(*modified_privs);
1253
1254 if (req->disable_all)
1255 token_disable_privileges( token );
1256 else
1257 token_adjust_privileges( token, privs, priv_count, modified_privs, modified_priv_count );
1258
1259 release_object( token );
1260 }
1261 }
1262
1263 /* retrieves the list of privileges that may be held be the token */
1264 DECL_HANDLER(get_token_privileges)
1265 {
1266 struct token *token;
1267
1268 if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1269 TOKEN_QUERY,
1270 &token_ops )))
1271 {
1272 int priv_count = 0;
1273 LUID_AND_ATTRIBUTES *privs;
1274 struct privilege *privilege;
1275
1276 LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
1277 priv_count++;
1278
1279 reply->len = priv_count * sizeof(*privs);
1280 if (reply->len <= get_reply_max_size())
1281 {
1282 privs = set_reply_data_size( priv_count * sizeof(*privs) );
1283 if (privs)
1284 {
1285 int i = 0;
1286 LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
1287 {
1288 luid_and_attr_from_privilege( &privs[i], privilege );
1289 i++;
1290 }
1291 }
1292 }
1293 else
1294 set_error(STATUS_BUFFER_TOO_SMALL);
1295
1296 release_object( token );
1297 }
1298 }
1299
1300 /* creates a duplicate of the token */
1301 DECL_HANDLER(duplicate_token)
1302 {
1303 struct token *src_token;
1304 struct unicode_str name;
1305 const struct security_descriptor *sd;
1306 const struct object_attributes *objattr = get_req_object_attributes( &sd, &name, NULL );
1307
1308 if (!objattr) return;
1309
1310 if ((src_token = (struct token *)get_handle_obj( current->process, req->handle,
1311 TOKEN_DUPLICATE,
1312 &token_ops )))
1313 {
1314 struct token *token = token_duplicate( src_token, req->primary, req->impersonation_level, sd );
1315 if (token)
1316 {
1317 reply->new_handle = alloc_handle_no_access_check( current->process, token, req->access, objattr->attributes );
1318 release_object( token );
1319 }
1320 release_object( src_token );
1321 }
1322 }
1323
1324 /* checks the specified privileges are held by the token */
1325 DECL_HANDLER(check_token_privileges)
1326 {
1327 struct token *token;
1328
1329 if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1330 TOKEN_QUERY,
1331 &token_ops )))
1332 {
1333 unsigned int count = get_req_data_size() / sizeof(LUID_AND_ATTRIBUTES);
1334
1335 if (!token->primary && token->impersonation_level <= SecurityAnonymous)
1336 set_error( STATUS_BAD_IMPERSONATION_LEVEL );
1337 else if (get_reply_max_size() >= count * sizeof(LUID_AND_ATTRIBUTES))
1338 {
1339 LUID_AND_ATTRIBUTES *usedprivs = set_reply_data_size( count * sizeof(*usedprivs) );
1340 reply->has_privileges = token_check_privileges( token, req->all_required, get_req_data(), count, usedprivs );
1341 }
1342 else
1343 set_error( STATUS_BUFFER_OVERFLOW );
1344 release_object( token );
1345 }
1346 }
1347
1348 /* checks that a user represented by a token is allowed to access an object
1349 * represented by a security descriptor */
1350 DECL_HANDLER(access_check)
1351 {
1352 data_size_t sd_size = get_req_data_size();
1353 const struct security_descriptor *sd = get_req_data();
1354 struct token *token;
1355
1356 if (!sd_is_valid( sd, sd_size ))
1357 {
1358 set_error( STATUS_ACCESS_VIOLATION );
1359 return;
1360 }
1361
1362 if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1363 TOKEN_QUERY,
1364 &token_ops )))
1365 {
1366 GENERIC_MAPPING mapping;
1367 unsigned int status;
1368 LUID_AND_ATTRIBUTES priv;
1369 unsigned int priv_count = 1;
1370
1371 memset(&priv, 0, sizeof(priv));
1372
1373 /* only impersonation tokens may be used with this function */
1374 if (token->primary)
1375 {
1376 set_error( STATUS_NO_IMPERSONATION_TOKEN );
1377 release_object( token );
1378 return;
1379 }
1380 /* anonymous impersonation tokens can't be used */
1381 if (token->impersonation_level <= SecurityAnonymous)
1382 {
1383 set_error( STATUS_BAD_IMPERSONATION_LEVEL );
1384 release_object( token );
1385 return;
1386 }
1387
1388 mapping.GenericRead = req->mapping_read;
1389 mapping.GenericWrite = req->mapping_write;
1390 mapping.GenericExecute = req->mapping_execute;
1391 mapping.GenericAll = req->mapping_all;
1392
1393 status = token_access_check(
1394 token, sd, req->desired_access, &priv, &priv_count, &mapping,
1395 &reply->access_granted, &reply->access_status );
1396
1397 reply->privileges_len = priv_count*sizeof(LUID_AND_ATTRIBUTES);
1398
1399 if ((priv_count > 0) && (reply->privileges_len <= get_reply_max_size()))
1400 {
1401 LUID_AND_ATTRIBUTES *privs = set_reply_data_size( priv_count * sizeof(*privs) );
1402 memcpy( privs, &priv, sizeof(priv) );
1403 }
1404
1405 set_error( status );
1406 release_object( token );
1407 }
1408 }
1409
1410 /* retrieves an SID from the token */
1411 DECL_HANDLER(get_token_sid)
1412 {
1413 struct token *token;
1414
1415 reply->sid_len = 0;
1416
1417 if ((token = (struct token *)get_handle_obj( current->process, req->handle, TOKEN_QUERY, &token_ops )))
1418 {
1419 const SID *sid = NULL;
1420
1421 switch (req->which_sid)
1422 {
1423 case TokenUser:
1424 assert(token->user);
1425 sid = token->user;
1426 break;
1427 case TokenPrimaryGroup:
1428 sid = token->primary_group;
1429 break;
1430 case TokenOwner:
1431 sid = token->owner;
1432 break;
1433 case TokenLogonSid:
1434 sid = (const SID *)&builtin_logon_sid;
1435 break;
1436 default:
1437 set_error( STATUS_INVALID_PARAMETER );
1438 break;
1439 }
1440
1441 if (sid)
1442 {
1443 reply->sid_len = security_sid_len( sid );
1444 if (reply->sid_len <= get_reply_max_size()) set_reply_data( sid, reply->sid_len );
1445 else set_error( STATUS_BUFFER_TOO_SMALL );
1446 }
1447 release_object( token );
1448 }
1449 }
1450
1451 /* retrieves the groups that the user represented by the token belongs to */
1452 DECL_HANDLER(get_token_groups)
1453 {
1454 struct token *token;
1455
1456 reply->user_len = 0;
1457
1458 if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1459 TOKEN_QUERY,
1460 &token_ops )))
1461 {
1462 size_t size_needed = sizeof(struct token_groups);
1463 size_t sid_size = 0;
1464 unsigned int group_count = 0;
1465 const struct group *group;
1466
1467 LIST_FOR_EACH_ENTRY( group, &token->groups, const struct group, entry )
1468 {
1469 group_count++;
1470 sid_size += security_sid_len( &group->sid );
1471 }
1472 size_needed += sid_size;
1473 /* attributes size */
1474 size_needed += sizeof(unsigned int) * group_count;
1475
1476 /* reply buffer contains size_needed bytes formatted as:
1477
1478 unsigned int count;
1479 unsigned int attrib[count];
1480 char sid_data[];
1481
1482 user_len includes extra data needed for TOKEN_GROUPS representation,
1483 required caller buffer size calculated here to avoid extra server call */
1484 reply->user_len = FIELD_OFFSET( TOKEN_GROUPS, Groups[group_count] ) + sid_size;
1485
1486 if (reply->user_len <= get_reply_max_size())
1487 {
1488 struct token_groups *tg = set_reply_data_size( size_needed );
1489 if (tg)
1490 {
1491 unsigned int *attr_ptr = (unsigned int *)(tg + 1);
1492 SID *sid_ptr = (SID *)(attr_ptr + group_count);
1493
1494 tg->count = group_count;
1495
1496 LIST_FOR_EACH_ENTRY( group, &token->groups, const struct group, entry )
1497 {
1498
1499 *attr_ptr = 0;
1500 if (group->mandatory) *attr_ptr |= SE_GROUP_MANDATORY;
1501 if (group->def) *attr_ptr |= SE_GROUP_ENABLED_BY_DEFAULT;
1502 if (group->enabled) *attr_ptr |= SE_GROUP_ENABLED;
1503 if (group->owner) *attr_ptr |= SE_GROUP_OWNER;
1504 if (group->deny_only) *attr_ptr |= SE_GROUP_USE_FOR_DENY_ONLY;
1505 if (group->resource) *attr_ptr |= SE_GROUP_RESOURCE;
1506 if (group->logon) *attr_ptr |= SE_GROUP_LOGON_ID;
1507
1508 memcpy(sid_ptr, &group->sid, security_sid_len( &group->sid ));
1509
1510 sid_ptr = (SID *)((char *)sid_ptr + security_sid_len( &group->sid ));
1511 attr_ptr++;
1512 }
1513 }
1514 }
1515 else set_error( STATUS_BUFFER_TOO_SMALL );
1516
1517 release_object( token );
1518 }
1519 }
1520
1521 DECL_HANDLER(get_token_impersonation_level)
1522 {
1523 struct token *token;
1524
1525 if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1526 TOKEN_QUERY,
1527 &token_ops )))
1528 {
1529 if (token->primary)
1530 set_error( STATUS_INVALID_PARAMETER );
1531 else
1532 reply->impersonation_level = token->impersonation_level;
1533
1534 release_object( token );
1535 }
1536 }
1537
1538 DECL_HANDLER(get_token_statistics)
1539 {
1540 struct token *token;
1541
1542 if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1543 TOKEN_QUERY,
1544 &token_ops )))
1545 {
1546 reply->token_id = token->token_id;
1547 reply->modified_id = token->modified_id;
1548 reply->primary = token->primary;
1549 reply->impersonation_level = token->impersonation_level;
1550 reply->group_count = list_count( &token->groups );
1551 reply->privilege_count = list_count( &token->privileges );
1552
1553 release_object( token );
1554 }
1555 }
1556
1557 DECL_HANDLER(get_token_default_dacl)
1558 {
1559 struct token *token;
1560
1561 reply->acl_len = 0;
1562
1563 if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1564 TOKEN_QUERY,
1565 &token_ops )))
1566 {
1567 if (token->default_dacl)
1568 reply->acl_len = token->default_dacl->AclSize;
1569
1570 if (reply->acl_len <= get_reply_max_size())
1571 {
1572 ACL *acl_reply = set_reply_data_size( reply->acl_len );
1573 if (acl_reply)
1574 memcpy( acl_reply, token->default_dacl, reply->acl_len );
1575 }
1576 else set_error( STATUS_BUFFER_TOO_SMALL );
1577
1578 release_object( token );
1579 }
1580 }
1581
1582 DECL_HANDLER(set_token_default_dacl)
1583 {
1584 struct token *token;
1585
1586 if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1587 TOKEN_ADJUST_DEFAULT,
1588 &token_ops )))
1589 {
1590 const ACL *acl = get_req_data();
1591 unsigned int acl_size = get_req_data_size();
1592
1593 free( token->default_dacl );
1594 token->default_dacl = NULL;
1595
1596 if (acl_size)
1597 token->default_dacl = memdup( acl, acl_size );
1598
1599 release_object( token );
1600 }
1601 }
Windows API implementation