/
acl.c
5410 lines (4668 loc) · 139 KB
/
acl.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*-------------------------------------------------------------------------
*
* acl.c
* Basic access control list data structures manipulation routines.
*
* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/utils/adt/acl.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <ctype.h>
#include "access/htup_details.h"
#include "catalog/catalog.h"
#include "catalog/namespace.h"
#include "catalog/pg_auth_members.h"
#include "catalog/pg_authid.h"
#include "catalog/pg_class.h"
#include "catalog/pg_database.h"
#include "catalog/pg_foreign_data_wrapper.h"
#include "catalog/pg_foreign_server.h"
#include "catalog/pg_language.h"
#include "catalog/pg_namespace.h"
#include "catalog/pg_parameter_acl.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_tablespace.h"
#include "catalog/pg_type.h"
#include "commands/dbcommands.h"
#include "commands/proclang.h"
#include "commands/tablespace.h"
#include "common/hashfn.h"
#include "foreign/foreign.h"
#include "funcapi.h"
#include "lib/qunique.h"
#include "miscadmin.h"
#include "utils/acl.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/catcache.h"
#include "utils/guc.h"
#include "utils/inval.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/syscache.h"
#include "utils/varlena.h"
typedef struct
{
const char *name;
AclMode value;
} priv_map;
/*
* We frequently need to test whether a given role is a member of some other
* role. In most of these tests the "given role" is the same, namely the
* active current user. So we can optimize it by keeping cached lists of all
* the roles the "given role" is a member of, directly or indirectly.
*
* Possibly this mechanism should be generalized to allow caching membership
* info for multiple roles?
*
* Each element of cached_roles is an OID list of constituent roles for the
* corresponding element of cached_role (always including the cached_role
* itself). There's a separate cache for each RoleRecurseType, with the
* corresponding semantics.
*/
enum RoleRecurseType
{
ROLERECURSE_MEMBERS = 0, /* recurse unconditionally */
ROLERECURSE_PRIVS = 1, /* recurse through inheritable grants */
ROLERECURSE_SETROLE = 2 /* recurse through grants with set_option */
};
static Oid cached_role[] = {InvalidOid, InvalidOid, InvalidOid};
static List *cached_roles[] = {NIL, NIL, NIL};
static uint32 cached_db_hash;
static const char *getid(const char *s, char *n, Node *escontext);
static void putid(char *p, const char *s);
static Acl *allocacl(int n);
static void check_acl(const Acl *acl);
static const char *aclparse(const char *s, AclItem *aip, Node *escontext);
static bool aclitem_match(const AclItem *a1, const AclItem *a2);
static int aclitemComparator(const void *arg1, const void *arg2);
static void check_circularity(const Acl *old_acl, const AclItem *mod_aip,
Oid ownerId);
static Acl *recursive_revoke(Acl *acl, Oid grantee, AclMode revoke_privs,
Oid ownerId, DropBehavior behavior);
static AclMode convert_any_priv_string(text *priv_type_text,
const priv_map *privileges);
static Oid convert_table_name(text *tablename);
static AclMode convert_table_priv_string(text *priv_type_text);
static AclMode convert_sequence_priv_string(text *priv_type_text);
static AttrNumber convert_column_name(Oid tableoid, text *column);
static AclMode convert_column_priv_string(text *priv_type_text);
static Oid convert_database_name(text *databasename);
static AclMode convert_database_priv_string(text *priv_type_text);
static Oid convert_foreign_data_wrapper_name(text *fdwname);
static AclMode convert_foreign_data_wrapper_priv_string(text *priv_type_text);
static Oid convert_function_name(text *functionname);
static AclMode convert_function_priv_string(text *priv_type_text);
static Oid convert_language_name(text *languagename);
static AclMode convert_language_priv_string(text *priv_type_text);
static Oid convert_schema_name(text *schemaname);
static AclMode convert_schema_priv_string(text *priv_type_text);
static Oid convert_server_name(text *servername);
static AclMode convert_server_priv_string(text *priv_type_text);
static Oid convert_tablespace_name(text *tablespacename);
static AclMode convert_tablespace_priv_string(text *priv_type_text);
static Oid convert_type_name(text *typename);
static AclMode convert_type_priv_string(text *priv_type_text);
static AclMode convert_parameter_priv_string(text *priv_text);
static AclMode convert_role_priv_string(text *priv_type_text);
static AclResult pg_role_aclcheck(Oid role_oid, Oid roleid, AclMode mode);
static void RoleMembershipCacheCallback(Datum arg, int cacheid, uint32 hashvalue);
/*
* getid
* Consumes the first alphanumeric string (identifier) found in string
* 's', ignoring any leading white space. If it finds a double quote
* it returns the word inside the quotes.
*
* RETURNS:
* the string position in 's' that points to the next non-space character
* in 's', after any quotes. Also:
* - loads the identifier into 'n'. (If no identifier is found, 'n'
* contains an empty string.) 'n' must be NAMEDATALEN bytes.
*
* Errors are reported via ereport, unless escontext is an ErrorSaveData node,
* in which case we log the error there and return NULL.
*/
static const char *
getid(const char *s, char *n, Node *escontext)
{
int len = 0;
bool in_quotes = false;
Assert(s && n);
while (isspace((unsigned char) *s))
s++;
/* This code had better match what putid() does, below */
for (;
*s != '\0' &&
(isalnum((unsigned char) *s) ||
*s == '_' ||
*s == '"' ||
in_quotes);
s++)
{
if (*s == '"')
{
/* safe to look at next char (could be '\0' though) */
if (*(s + 1) != '"')
{
in_quotes = !in_quotes;
continue;
}
/* it's an escaped double quote; skip the escaping char */
s++;
}
/* Add the character to the string */
if (len >= NAMEDATALEN - 1)
ereturn(escontext, NULL,
(errcode(ERRCODE_NAME_TOO_LONG),
errmsg("identifier too long"),
errdetail("Identifier must be less than %d characters.",
NAMEDATALEN)));
n[len++] = *s;
}
n[len] = '\0';
while (isspace((unsigned char) *s))
s++;
return s;
}
/*
* Write a role name at *p, adding double quotes if needed.
* There must be at least (2*NAMEDATALEN)+2 bytes available at *p.
* This needs to be kept in sync with dequoteAclUserName in pg_dump/dumputils.c
*/
static void
putid(char *p, const char *s)
{
const char *src;
bool safe = true;
for (src = s; *src; src++)
{
/* This test had better match what getid() does, above */
if (!isalnum((unsigned char) *src) && *src != '_')
{
safe = false;
break;
}
}
if (!safe)
*p++ = '"';
for (src = s; *src; src++)
{
/* A double quote character in a username is encoded as "" */
if (*src == '"')
*p++ = '"';
*p++ = *src;
}
if (!safe)
*p++ = '"';
*p = '\0';
}
/*
* aclparse
* Consumes and parses an ACL specification of the form:
* [group|user] [A-Za-z0-9]*=[rwaR]*
* from string 's', ignoring any leading white space or white space
* between the optional id type keyword (group|user) and the actual
* ACL specification.
*
* The group|user decoration is unnecessary in the roles world,
* but we still accept it for backward compatibility.
*
* This routine is called by the parser as well as aclitemin(), hence
* the added generality.
*
* RETURNS:
* the string position in 's' immediately following the ACL
* specification. Also:
* - loads the structure pointed to by 'aip' with the appropriate
* UID/GID, id type identifier and mode type values.
*
* Errors are reported via ereport, unless escontext is an ErrorSaveData node,
* in which case we log the error there and return NULL.
*/
static const char *
aclparse(const char *s, AclItem *aip, Node *escontext)
{
AclMode privs,
goption,
read;
char name[NAMEDATALEN];
char name2[NAMEDATALEN];
Assert(s && aip);
s = getid(s, name, escontext);
if (s == NULL)
return NULL;
if (*s != '=')
{
/* we just read a keyword, not a name */
if (strcmp(name, "group") != 0 && strcmp(name, "user") != 0)
ereturn(escontext, NULL,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("unrecognized key word: \"%s\"", name),
errhint("ACL key word must be \"group\" or \"user\".")));
/* move s to the name beyond the keyword */
s = getid(s, name, escontext);
if (s == NULL)
return NULL;
if (name[0] == '\0')
ereturn(escontext, NULL,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("missing name"),
errhint("A name must follow the \"group\" or \"user\" key word.")));
}
if (*s != '=')
ereturn(escontext, NULL,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("missing \"=\" sign")));
privs = goption = ACL_NO_RIGHTS;
for (++s, read = 0; isalpha((unsigned char) *s) || *s == '*'; s++)
{
switch (*s)
{
case '*':
goption |= read;
break;
case ACL_INSERT_CHR:
read = ACL_INSERT;
break;
case ACL_SELECT_CHR:
read = ACL_SELECT;
break;
case ACL_UPDATE_CHR:
read = ACL_UPDATE;
break;
case ACL_DELETE_CHR:
read = ACL_DELETE;
break;
case ACL_TRUNCATE_CHR:
read = ACL_TRUNCATE;
break;
case ACL_REFERENCES_CHR:
read = ACL_REFERENCES;
break;
case ACL_TRIGGER_CHR:
read = ACL_TRIGGER;
break;
case ACL_EXECUTE_CHR:
read = ACL_EXECUTE;
break;
case ACL_USAGE_CHR:
read = ACL_USAGE;
break;
case ACL_CREATE_CHR:
read = ACL_CREATE;
break;
case ACL_CREATE_TEMP_CHR:
read = ACL_CREATE_TEMP;
break;
case ACL_CONNECT_CHR:
read = ACL_CONNECT;
break;
case ACL_SET_CHR:
read = ACL_SET;
break;
case ACL_ALTER_SYSTEM_CHR:
read = ACL_ALTER_SYSTEM;
break;
case 'R': /* ignore old RULE privileges */
read = 0;
break;
default:
ereturn(escontext, NULL,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("invalid mode character: must be one of \"%s\"",
ACL_ALL_RIGHTS_STR)));
}
privs |= read;
}
if (name[0] == '\0')
aip->ai_grantee = ACL_ID_PUBLIC;
else
{
aip->ai_grantee = get_role_oid(name, true);
if (!OidIsValid(aip->ai_grantee))
ereturn(escontext, NULL,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("role \"%s\" does not exist", name)));
}
/*
* XXX Allow a degree of backward compatibility by defaulting the grantor
* to the superuser.
*/
if (*s == '/')
{
s = getid(s + 1, name2, escontext);
if (s == NULL)
return NULL;
if (name2[0] == '\0')
ereturn(escontext, NULL,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("a name must follow the \"/\" sign")));
aip->ai_grantor = get_role_oid(name2, true);
if (!OidIsValid(aip->ai_grantor))
ereturn(escontext, NULL,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("role \"%s\" does not exist", name2)));
}
else
{
aip->ai_grantor = BOOTSTRAP_SUPERUSERID;
ereport(WARNING,
(errcode(ERRCODE_INVALID_GRANTOR),
errmsg("defaulting grantor to user ID %u",
BOOTSTRAP_SUPERUSERID)));
}
ACLITEM_SET_PRIVS_GOPTIONS(*aip, privs, goption);
return s;
}
/*
* allocacl
* Allocates storage for a new Acl with 'n' entries.
*
* RETURNS:
* the new Acl
*/
static Acl *
allocacl(int n)
{
Acl *new_acl;
Size size;
if (n < 0)
elog(ERROR, "invalid size: %d", n);
size = ACL_N_SIZE(n);
new_acl = (Acl *) palloc0(size);
SET_VARSIZE(new_acl, size);
new_acl->ndim = 1;
new_acl->dataoffset = 0; /* we never put in any nulls */
new_acl->elemtype = ACLITEMOID;
ARR_LBOUND(new_acl)[0] = 1;
ARR_DIMS(new_acl)[0] = n;
return new_acl;
}
/*
* Create a zero-entry ACL
*/
Acl *
make_empty_acl(void)
{
return allocacl(0);
}
/*
* Copy an ACL
*/
Acl *
aclcopy(const Acl *orig_acl)
{
Acl *result_acl;
result_acl = allocacl(ACL_NUM(orig_acl));
memcpy(ACL_DAT(result_acl),
ACL_DAT(orig_acl),
ACL_NUM(orig_acl) * sizeof(AclItem));
return result_acl;
}
/*
* Concatenate two ACLs
*
* This is a bit cheesy, since we may produce an ACL with redundant entries.
* Be careful what the result is used for!
*/
Acl *
aclconcat(const Acl *left_acl, const Acl *right_acl)
{
Acl *result_acl;
result_acl = allocacl(ACL_NUM(left_acl) + ACL_NUM(right_acl));
memcpy(ACL_DAT(result_acl),
ACL_DAT(left_acl),
ACL_NUM(left_acl) * sizeof(AclItem));
memcpy(ACL_DAT(result_acl) + ACL_NUM(left_acl),
ACL_DAT(right_acl),
ACL_NUM(right_acl) * sizeof(AclItem));
return result_acl;
}
/*
* Merge two ACLs
*
* This produces a properly merged ACL with no redundant entries.
* Returns NULL on NULL input.
*/
Acl *
aclmerge(const Acl *left_acl, const Acl *right_acl, Oid ownerId)
{
Acl *result_acl;
AclItem *aip;
int i,
num;
/* Check for cases where one or both are empty/null */
if (left_acl == NULL || ACL_NUM(left_acl) == 0)
{
if (right_acl == NULL || ACL_NUM(right_acl) == 0)
return NULL;
else
return aclcopy(right_acl);
}
else
{
if (right_acl == NULL || ACL_NUM(right_acl) == 0)
return aclcopy(left_acl);
}
/* Merge them the hard way, one item at a time */
result_acl = aclcopy(left_acl);
aip = ACL_DAT(right_acl);
num = ACL_NUM(right_acl);
for (i = 0; i < num; i++, aip++)
{
Acl *tmp_acl;
tmp_acl = aclupdate(result_acl, aip, ACL_MODECHG_ADD,
ownerId, DROP_RESTRICT);
pfree(result_acl);
result_acl = tmp_acl;
}
return result_acl;
}
/*
* Sort the items in an ACL (into an arbitrary but consistent order)
*/
void
aclitemsort(Acl *acl)
{
if (acl != NULL && ACL_NUM(acl) > 1)
qsort(ACL_DAT(acl), ACL_NUM(acl), sizeof(AclItem), aclitemComparator);
}
/*
* Check if two ACLs are exactly equal
*
* This will not detect equality if the two arrays contain the same items
* in different orders. To handle that case, sort both inputs first,
* using aclitemsort().
*/
bool
aclequal(const Acl *left_acl, const Acl *right_acl)
{
/* Check for cases where one or both are empty/null */
if (left_acl == NULL || ACL_NUM(left_acl) == 0)
{
if (right_acl == NULL || ACL_NUM(right_acl) == 0)
return true;
else
return false;
}
else
{
if (right_acl == NULL || ACL_NUM(right_acl) == 0)
return false;
}
if (ACL_NUM(left_acl) != ACL_NUM(right_acl))
return false;
if (memcmp(ACL_DAT(left_acl),
ACL_DAT(right_acl),
ACL_NUM(left_acl) * sizeof(AclItem)) == 0)
return true;
return false;
}
/*
* Verify that an ACL array is acceptable (one-dimensional and has no nulls)
*/
static void
check_acl(const Acl *acl)
{
if (ARR_ELEMTYPE(acl) != ACLITEMOID)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("ACL array contains wrong data type")));
if (ARR_NDIM(acl) != 1)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("ACL arrays must be one-dimensional")));
if (ARR_HASNULL(acl))
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("ACL arrays must not contain null values")));
}
/*
* aclitemin
* Allocates storage for, and fills in, a new AclItem given a string
* 's' that contains an ACL specification. See aclparse for details.
*
* RETURNS:
* the new AclItem
*/
Datum
aclitemin(PG_FUNCTION_ARGS)
{
const char *s = PG_GETARG_CSTRING(0);
Node *escontext = fcinfo->context;
AclItem *aip;
aip = (AclItem *) palloc(sizeof(AclItem));
s = aclparse(s, aip, escontext);
if (s == NULL)
PG_RETURN_NULL();
while (isspace((unsigned char) *s))
++s;
if (*s)
ereturn(escontext, (Datum) 0,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("extra garbage at the end of the ACL specification")));
PG_RETURN_ACLITEM_P(aip);
}
/*
* aclitemout
* Allocates storage for, and fills in, a new null-delimited string
* containing a formatted ACL specification. See aclparse for details.
*
* RETURNS:
* the new string
*/
Datum
aclitemout(PG_FUNCTION_ARGS)
{
AclItem *aip = PG_GETARG_ACLITEM_P(0);
char *p;
char *out;
HeapTuple htup;
unsigned i;
out = palloc(strlen("=/") +
2 * N_ACL_RIGHTS +
2 * (2 * NAMEDATALEN + 2) +
1);
p = out;
*p = '\0';
if (aip->ai_grantee != ACL_ID_PUBLIC)
{
htup = SearchSysCache1(AUTHOID, ObjectIdGetDatum(aip->ai_grantee));
if (HeapTupleIsValid(htup))
{
putid(p, NameStr(((Form_pg_authid) GETSTRUCT(htup))->rolname));
ReleaseSysCache(htup);
}
else
{
/* Generate numeric OID if we don't find an entry */
sprintf(p, "%u", aip->ai_grantee);
}
}
while (*p)
++p;
*p++ = '=';
for (i = 0; i < N_ACL_RIGHTS; ++i)
{
if (ACLITEM_GET_PRIVS(*aip) & (UINT64CONST(1) << i))
*p++ = ACL_ALL_RIGHTS_STR[i];
if (ACLITEM_GET_GOPTIONS(*aip) & (UINT64CONST(1) << i))
*p++ = '*';
}
*p++ = '/';
*p = '\0';
htup = SearchSysCache1(AUTHOID, ObjectIdGetDatum(aip->ai_grantor));
if (HeapTupleIsValid(htup))
{
putid(p, NameStr(((Form_pg_authid) GETSTRUCT(htup))->rolname));
ReleaseSysCache(htup);
}
else
{
/* Generate numeric OID if we don't find an entry */
sprintf(p, "%u", aip->ai_grantor);
}
PG_RETURN_CSTRING(out);
}
/*
* aclitem_match
* Two AclItems are considered to match iff they have the same
* grantee and grantor; the privileges are ignored.
*/
static bool
aclitem_match(const AclItem *a1, const AclItem *a2)
{
return a1->ai_grantee == a2->ai_grantee &&
a1->ai_grantor == a2->ai_grantor;
}
/*
* aclitemComparator
* qsort comparison function for AclItems
*/
static int
aclitemComparator(const void *arg1, const void *arg2)
{
const AclItem *a1 = (const AclItem *) arg1;
const AclItem *a2 = (const AclItem *) arg2;
if (a1->ai_grantee > a2->ai_grantee)
return 1;
if (a1->ai_grantee < a2->ai_grantee)
return -1;
if (a1->ai_grantor > a2->ai_grantor)
return 1;
if (a1->ai_grantor < a2->ai_grantor)
return -1;
if (a1->ai_privs > a2->ai_privs)
return 1;
if (a1->ai_privs < a2->ai_privs)
return -1;
return 0;
}
/*
* aclitem equality operator
*/
Datum
aclitem_eq(PG_FUNCTION_ARGS)
{
AclItem *a1 = PG_GETARG_ACLITEM_P(0);
AclItem *a2 = PG_GETARG_ACLITEM_P(1);
bool result;
result = a1->ai_privs == a2->ai_privs &&
a1->ai_grantee == a2->ai_grantee &&
a1->ai_grantor == a2->ai_grantor;
PG_RETURN_BOOL(result);
}
/*
* aclitem hash function
*
* We make aclitems hashable not so much because anyone is likely to hash
* them, as because we want array equality to work on aclitem arrays, and
* with the typcache mechanism we must have a hash or btree opclass.
*/
Datum
hash_aclitem(PG_FUNCTION_ARGS)
{
AclItem *a = PG_GETARG_ACLITEM_P(0);
/* not very bright, but avoids any issue of padding in struct */
PG_RETURN_UINT32((uint32) (a->ai_privs + a->ai_grantee + a->ai_grantor));
}
/*
* 64-bit hash function for aclitem.
*
* Similar to hash_aclitem, but accepts a seed and returns a uint64 value.
*/
Datum
hash_aclitem_extended(PG_FUNCTION_ARGS)
{
AclItem *a = PG_GETARG_ACLITEM_P(0);
uint64 seed = PG_GETARG_INT64(1);
uint32 sum = (uint32) (a->ai_privs + a->ai_grantee + a->ai_grantor);
return (seed == 0) ? UInt64GetDatum(sum) : hash_uint32_extended(sum, seed);
}
/*
* acldefault() --- create an ACL describing default access permissions
*
* Change this routine if you want to alter the default access policy for
* newly-created objects (or any object with a NULL acl entry). When
* you make a change here, don't forget to update the GRANT man page,
* which explains all the default permissions.
*
* Note that these are the hard-wired "defaults" that are used in the
* absence of any pg_default_acl entry.
*/
Acl *
acldefault(ObjectType objtype, Oid ownerId)
{
AclMode world_default;
AclMode owner_default;
int nacl;
Acl *acl;
AclItem *aip;
switch (objtype)
{
case OBJECT_COLUMN:
/* by default, columns have no extra privileges */
world_default = ACL_NO_RIGHTS;
owner_default = ACL_NO_RIGHTS;
break;
case OBJECT_TABLE:
world_default = ACL_NO_RIGHTS;
owner_default = ACL_ALL_RIGHTS_RELATION;
break;
case OBJECT_SEQUENCE:
world_default = ACL_NO_RIGHTS;
owner_default = ACL_ALL_RIGHTS_SEQUENCE;
break;
case OBJECT_DATABASE:
/* for backwards compatibility, grant some rights by default */
world_default = ACL_CREATE_TEMP | ACL_CONNECT;
owner_default = ACL_ALL_RIGHTS_DATABASE;
break;
case OBJECT_FUNCTION:
/* Grant EXECUTE by default, for now */
world_default = ACL_EXECUTE;
owner_default = ACL_ALL_RIGHTS_FUNCTION;
break;
case OBJECT_LANGUAGE:
/* Grant USAGE by default, for now */
world_default = ACL_USAGE;
owner_default = ACL_ALL_RIGHTS_LANGUAGE;
break;
case OBJECT_LARGEOBJECT:
world_default = ACL_NO_RIGHTS;
owner_default = ACL_ALL_RIGHTS_LARGEOBJECT;
break;
case OBJECT_SCHEMA:
world_default = ACL_NO_RIGHTS;
owner_default = ACL_ALL_RIGHTS_SCHEMA;
break;
case OBJECT_TABLESPACE:
world_default = ACL_NO_RIGHTS;
owner_default = ACL_ALL_RIGHTS_TABLESPACE;
break;
case OBJECT_FDW:
world_default = ACL_NO_RIGHTS;
owner_default = ACL_ALL_RIGHTS_FDW;
break;
case OBJECT_FOREIGN_SERVER:
world_default = ACL_NO_RIGHTS;
owner_default = ACL_ALL_RIGHTS_FOREIGN_SERVER;
break;
case OBJECT_DOMAIN:
case OBJECT_TYPE:
world_default = ACL_USAGE;
owner_default = ACL_ALL_RIGHTS_TYPE;
break;
case OBJECT_PARAMETER_ACL:
world_default = ACL_NO_RIGHTS;
owner_default = ACL_ALL_RIGHTS_PARAMETER_ACL;
break;
default:
elog(ERROR, "unrecognized object type: %d", (int) objtype);
world_default = ACL_NO_RIGHTS; /* keep compiler quiet */
owner_default = ACL_NO_RIGHTS;
break;
}
nacl = 0;
if (world_default != ACL_NO_RIGHTS)
nacl++;
if (owner_default != ACL_NO_RIGHTS)
nacl++;
acl = allocacl(nacl);
aip = ACL_DAT(acl);
if (world_default != ACL_NO_RIGHTS)
{
aip->ai_grantee = ACL_ID_PUBLIC;
aip->ai_grantor = ownerId;
ACLITEM_SET_PRIVS_GOPTIONS(*aip, world_default, ACL_NO_RIGHTS);
aip++;
}
/*
* Note that the owner's entry shows all ordinary privileges but no grant
* options. This is because his grant options come "from the system" and
* not from his own efforts. (The SQL spec says that the owner's rights
* come from a "_SYSTEM" authid.) However, we do consider that the
* owner's ordinary privileges are self-granted; this lets him revoke
* them. We implement the owner's grant options without any explicit
* "_SYSTEM"-like ACL entry, by internally special-casing the owner
* wherever we are testing grant options.
*/
if (owner_default != ACL_NO_RIGHTS)
{
aip->ai_grantee = ownerId;
aip->ai_grantor = ownerId;
ACLITEM_SET_PRIVS_GOPTIONS(*aip, owner_default, ACL_NO_RIGHTS);
}
return acl;
}
/*
* SQL-accessible version of acldefault(). Hackish mapping from "char" type to
* OBJECT_* values.
*/
Datum
acldefault_sql(PG_FUNCTION_ARGS)
{
char objtypec = PG_GETARG_CHAR(0);
Oid owner = PG_GETARG_OID(1);
ObjectType objtype = 0;
switch (objtypec)
{
case 'c':
objtype = OBJECT_COLUMN;
break;
case 'r':
objtype = OBJECT_TABLE;
break;
case 's':
objtype = OBJECT_SEQUENCE;
break;
case 'd':
objtype = OBJECT_DATABASE;
break;
case 'f':
objtype = OBJECT_FUNCTION;
break;
case 'l':
objtype = OBJECT_LANGUAGE;
break;
case 'L':
objtype = OBJECT_LARGEOBJECT;
break;
case 'n':
objtype = OBJECT_SCHEMA;
break;
case 'p':
objtype = OBJECT_PARAMETER_ACL;
break;
case 't':
objtype = OBJECT_TABLESPACE;
break;
case 'F':
objtype = OBJECT_FDW;
break;
case 'S':
objtype = OBJECT_FOREIGN_SERVER;
break;
case 'T':
objtype = OBJECT_TYPE;
break;
default:
elog(ERROR, "unrecognized object type abbreviation: %c", objtypec);
}
PG_RETURN_ACL_P(acldefault(objtype, owner));
}
/*
* Update an ACL array to add or remove specified privileges.
*
* old_acl: the input ACL array
* mod_aip: defines the privileges to be added, removed, or substituted
* modechg: ACL_MODECHG_ADD, ACL_MODECHG_DEL, or ACL_MODECHG_EQL
* ownerId: Oid of object owner
* behavior: RESTRICT or CASCADE behavior for recursive removal
*
* ownerid and behavior are only relevant when the update operation specifies
* deletion of grant options.
*
* The result is a modified copy; the input object is not changed.
*
* NB: caller is responsible for having detoasted the input ACL, if needed.
*/
Acl *
aclupdate(const Acl *old_acl, const AclItem *mod_aip,
int modechg, Oid ownerId, DropBehavior behavior)
{
Acl *new_acl = NULL;
AclItem *old_aip,
*new_aip = NULL;
AclMode old_rights,
old_goptions,
new_rights,
new_goptions;
int dst,
num;
/* Caller probably already checked old_acl, but be safe */
check_acl(old_acl);
/* If granting grant options, check for circularity */
if (modechg != ACL_MODECHG_DEL &&
ACLITEM_GET_GOPTIONS(*mod_aip) != ACL_NO_RIGHTS)
check_circularity(old_acl, mod_aip, ownerId);
num = ACL_NUM(old_acl);
old_aip = ACL_DAT(old_acl);
/*
* Search the ACL for an existing entry for this grantee and grantor. If
* one exists, just modify the entry in-place (well, in the same position,
* since we actually return a copy); otherwise, insert the new entry at
* the end.
*/
for (dst = 0; dst < num; ++dst)
{
if (aclitem_match(mod_aip, old_aip + dst))
{