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Commit3f9aec5

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Flat file cleanup phase 2: make it work for pg_group. The flat group
file now identifies group members by usesysid not name; this avoidsneeding to depend on SearchSysCache which we can't use during startup.(The old representation was entirely broken anyway, since we did notregenerate the file following RENAME USER.) It's only a 95% solutionbecause if the group membership list is big enough to be toasted outof line, we cannot read it during startup. I think this will do forthe moment, until we have time to implement the planned pg_rolereplacement for pg_group.
1 parent60b2444 commit3f9aec5

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3 files changed

+104
-110
lines changed

3 files changed

+104
-110
lines changed

‎src/backend/libpq/crypt.c‎

Lines changed: 12 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -9,7 +9,7 @@
99
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
1010
* Portions Copyright (c) 1994, Regents of the University of California
1111
*
12-
* $PostgreSQL: pgsql/src/backend/libpq/crypt.c,v 1.61 2004/12/31 21:59:50 pgsql Exp $
12+
* $PostgreSQL: pgsql/src/backend/libpq/crypt.c,v 1.62 2005/02/20 04:45:57 tgl Exp $
1313
*
1414
*-------------------------------------------------------------------------
1515
*/
@@ -42,14 +42,18 @@ md5_crypt_verify(const Port *port, const char *user, char *client_pass)
4242
if ((line=get_user_line(user))==NULL)
4343
returnSTATUS_ERROR;
4444

45-
/* Skip over username */
46-
token=lnext(list_head(*line));
45+
/* Skip over username and usesysid */
46+
token=list_head(*line);
47+
if (token)
48+
token=lnext(token);
49+
if (token)
50+
token=lnext(token);
4751
if (token)
4852
{
49-
shadow_pass=lfirst(token);
53+
shadow_pass=(char*)lfirst(token);
5054
token=lnext(token);
5155
if (token)
52-
valuntil=lfirst(token);
56+
valuntil=(char*)lfirst(token);
5357
}
5458

5559
if (shadow_pass==NULL||*shadow_pass=='\0')
@@ -142,16 +146,14 @@ md5_crypt_verify(const Port *port, const char *user, char *client_pass)
142146
/*
143147
* Password OK, now check to be sure we are not past valuntil
144148
*/
145-
AbsoluteTimevuntil,
146-
current;
149+
AbsoluteTimevuntil;
147150

148-
if (!valuntil)
151+
if (valuntil==NULL||*valuntil=='\0')
149152
vuntil=INVALID_ABSTIME;
150153
else
151154
vuntil=DatumGetAbsoluteTime(DirectFunctionCall1(abstimein,
152155
CStringGetDatum(valuntil)));
153-
current=GetCurrentAbsoluteTime();
154-
if (vuntil!=INVALID_ABSTIME&&vuntil<current)
156+
if (vuntil!=INVALID_ABSTIME&&vuntil<GetCurrentAbsoluteTime())
155157
retval=STATUS_ERROR;
156158
else
157159
retval=STATUS_OK;

‎src/backend/libpq/hba.c‎

Lines changed: 16 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -10,7 +10,7 @@
1010
*
1111
*
1212
* IDENTIFICATION
13-
* $PostgreSQL: pgsql/src/backend/libpq/hba.c,v 1.138 2005/02/2002:21:40 tgl Exp $
13+
* $PostgreSQL: pgsql/src/backend/libpq/hba.c,v 1.139 2005/02/2004:45:57 tgl Exp $
1414
*
1515
*-------------------------------------------------------------------------
1616
*/
@@ -498,23 +498,28 @@ get_user_line(const char *user)
498498

499499

500500
/*
501-
*Check group for a specific user.
501+
*Does user belong to group?
502502
*/
503503
staticbool
504504
check_group(char*group,char*user)
505505
{
506506
List**line;
507+
ListCell*line_item;
508+
char*usesysid;
507509

508-
if ((line=get_group_line(group))!=NULL)
509-
{
510-
ListCell*line_item;
510+
if ((line=get_user_line(user))==NULL)
511+
return false;/* if user not exist, say "no" */
512+
/* Skip over username to get usesysid */
513+
usesysid= (char*)lsecond(*line);
511514

512-
/* skip over the group name */
513-
for_each_cell(line_item,lnext(list_head(*line)))
514-
{
515-
if (strcmp(lfirst(line_item),user)==0)
516-
return true;
517-
}
515+
if ((line=get_group_line(group))==NULL)
516+
return false;/* if group not exist, say "no" */
517+
518+
/* skip over the group name, examine all the member usesysid's */
519+
for_each_cell(line_item,lnext(list_head(*line)))
520+
{
521+
if (strcmp((char*)lfirst(line_item),usesysid)==0)
522+
return true;
518523
}
519524

520525
return false;

‎src/backend/utils/init/flatfiles.c‎

Lines changed: 76 additions & 89 deletions
Original file line numberDiff line numberDiff line change
@@ -22,7 +22,7 @@
2222
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
2323
* Portions Copyright (c) 1994, Regents of the University of California
2424
*
25-
* $PostgreSQL: pgsql/src/backend/utils/init/flatfiles.c,v 1.1 2005/02/2002:22:00 tgl Exp $
25+
* $PostgreSQL: pgsql/src/backend/utils/init/flatfiles.c,v 1.2 2005/02/2004:45:59 tgl Exp $
2626
*
2727
*-------------------------------------------------------------------------
2828
*/
@@ -278,7 +278,7 @@ write_database_file(Relation drel)
278278
}
279279

280280
/*
281-
*File format is: "dbname" oid frozenxid
281+
*The file format is: "dbname" oid frozenxid
282282
*
283283
* The xid is not needed for backend startup, but may be of use
284284
* for forensic purposes.
@@ -317,13 +317,6 @@ write_database_file(Relation drel)
317317

318318
/*
319319
* write_group_file: update the flat group file
320-
*
321-
* XXX this will never be able to work during system bootstrap: we don't
322-
* have either TOAST support or SysCache support. Need to redefine both
323-
* the catalog and file contents to fix this completely. In the short term
324-
* we can handle everything except an out-of-line-toasted grolist, if we
325-
* change the flat file definition to store numeric sysids instead of
326-
* user names.
327320
*/
328321
staticvoid
329322
write_group_file(Relationgrel)
@@ -335,7 +328,6 @@ write_group_file(Relation grel)
335328
mode_toumask;
336329
HeapScanDescscan;
337330
HeapTupletuple;
338-
TupleDescdsc=RelationGetDescr(grel);
339331

340332
/*
341333
* Create a temporary filename to be renamed later. This prevents the
@@ -364,22 +356,19 @@ write_group_file(Relation grel)
364356
scan=heap_beginscan(grel,SnapshotSelf,0,NULL);
365357
while ((tuple=heap_getnext(scan,ForwardScanDirection))!=NULL)
366358
{
367-
Datumdatum,
368-
grolist_datum;
369-
boolisnull;
359+
Form_pg_groupgrpform= (Form_pg_group)GETSTRUCT(tuple);
360+
HeapTupleHeadertup=tuple->t_data;
361+
char*tp;/* ptr to tuple data */
362+
longoff;/* offset in tuple data */
363+
bits8*bp=tup->t_bits;/* ptr to null bitmask in tuple */
364+
Datumdatum;
370365
char*groname;
371366
IdList*grolist_p;
372367
AclId*aidp;
373368
inti,
374369
num;
375-
char*usename;
376-
boolfirst_user= true;
377370

378-
datum=heap_getattr(tuple,Anum_pg_group_groname,dsc,&isnull);
379-
/* ignore NULL groupnames --- shouldn't happen */
380-
if (isnull)
381-
continue;
382-
groname=NameStr(*DatumGetName(datum));
371+
groname=NameStr(grpform->groname);
383372

384373
/*
385374
* Check for illegal characters in the group name.
@@ -391,57 +380,58 @@ write_group_file(Relation grel)
391380
continue;
392381
}
393382

394-
grolist_datum=heap_getattr(tuple,Anum_pg_group_grolist,dsc,&isnull);
395-
/* Ignore NULL group lists */
396-
if (isnull)
383+
/*
384+
* We can't use heap_getattr() here because during startup we will
385+
* not have any tupdesc for pg_group. Fortunately it's not too
386+
* hard to work around this. grolist is the first possibly-null
387+
* field so we can compute its offset directly.
388+
*/
389+
tp= (char*)tup+tup->t_hoff;
390+
off= offsetof(FormData_pg_group,grolist);
391+
392+
if (HeapTupleHasNulls(tuple)&&
393+
att_isnull(Anum_pg_group_grolist-1,bp))
394+
{
395+
/* grolist is null, so we can ignore this group */
396+
continue;
397+
}
398+
399+
/* assume grolist is pass-by-ref */
400+
datum=PointerGetDatum(tp+off);
401+
402+
/*
403+
* We can't currently support out-of-line toasted group lists in
404+
* startup mode (the tuptoaster won't work). This sucks, but it
405+
* should be something of a corner case. Live with it until we
406+
* can redesign pg_group.
407+
*
408+
* Detect startup mode by noting whether we got a tupdesc.
409+
*/
410+
if (VARATT_IS_EXTERNAL(DatumGetPointer(datum))&&
411+
RelationGetDescr(grel)==NULL)
397412
continue;
398413

399414
/* be sure the IdList is not toasted */
400-
grolist_p=DatumGetIdListP(grolist_datum);
415+
grolist_p=DatumGetIdListP(datum);
401416

402-
/* scan grolist */
403-
num=IDLIST_NUM(grolist_p);
417+
/*
418+
* The file format is: "groupname" usesysid1 usesysid2 ...
419+
*
420+
* We ignore groups that have no members.
421+
*/
404422
aidp=IDLIST_DAT(grolist_p);
405-
for (i=0;i<num;++i)
423+
num=IDLIST_NUM(grolist_p);
424+
if (num>0)
406425
{
407-
tuple=SearchSysCache(SHADOWSYSID,
408-
PointerGetDatum(aidp[i]),
409-
0,0,0);
410-
if (HeapTupleIsValid(tuple))
411-
{
412-
usename=NameStr(((Form_pg_shadow)GETSTRUCT(tuple))->usename);
413-
414-
/*
415-
* Check for illegal characters in the user name.
416-
*/
417-
if (!name_okay(usename))
418-
{
419-
ereport(LOG,
420-
(errmsg("invalid user name \"%s\"",usename)));
421-
continue;
422-
}
423-
424-
/*
425-
* File format is: "groupname" "user1" "user2" "user3"
426-
*/
427-
if (first_user)
428-
{
429-
fputs_quote(groname,fp);
430-
fputs("\t",fp);
431-
first_user= false;
432-
}
433-
else
434-
fputs(" ",fp);
435-
436-
fputs_quote(usename,fp);
437-
438-
ReleaseSysCache(tuple);
439-
}
440-
}
441-
if (!first_user)
426+
fputs_quote(groname,fp);
427+
fprintf(fp,"\t%u",aidp[0]);
428+
for (i=1;i<num;++i)
429+
fprintf(fp," %u",aidp[i]);
442430
fputs("\n",fp);
431+
}
432+
443433
/* if IdList was toasted, free detoasted copy */
444-
if ((Pointer)grolist_p!=DatumGetPointer(grolist_datum))
434+
if ((Pointer)grolist_p!=DatumGetPointer(datum))
445435
pfree(grolist_p);
446436
}
447437
heap_endscan(scan);
@@ -517,8 +507,10 @@ write_user_file(Relation urel)
517507
char*usename,
518508
*passwd,
519509
*valuntil;
510+
AclIdusesysid;
520511

521512
usename=NameStr(pwform->usename);
513+
usesysid=pwform->usesysid;
522514

523515
/*
524516
* We can't use heap_getattr() here because during startup we will
@@ -532,30 +524,26 @@ write_user_file(Relation urel)
532524
if (HeapTupleHasNulls(tuple)&&
533525
att_isnull(Anum_pg_shadow_passwd-1,bp))
534526
{
535-
/*
536-
* It can be argued that people having a null password shouldn't
537-
* be allowed to connect under password authentication, because
538-
* they need to have a password set up first. If you think
539-
* assuming an empty password in that case is better, change this
540-
* logic to look something like the code for valuntil.
541-
*/
542-
continue;
527+
/* passwd is null, emit as an empty string */
528+
passwd=pstrdup("");
543529
}
530+
else
531+
{
532+
/* assume passwd is pass-by-ref */
533+
datum=PointerGetDatum(tp+off);
544534

545-
/* assume passwd is pass-by-ref */
546-
datum=PointerGetDatum(tp+off);
547-
548-
/*
549-
* The password probably shouldn't ever be out-of-line toasted;
550-
* if it is, ignore it, since we can't handle that in startup mode.
551-
*/
552-
if (VARATT_IS_EXTERNAL(DatumGetPointer(datum)))
553-
continue;
554-
555-
passwd=DatumGetCString(DirectFunctionCall1(textout,datum));
535+
/*
536+
* The password probably shouldn't ever be out-of-line toasted;
537+
* if it is, ignore it, since we can't handle that in startup mode.
538+
*/
539+
if (VARATT_IS_EXTERNAL(DatumGetPointer(datum)))
540+
passwd=pstrdup("");
541+
else
542+
passwd=DatumGetCString(DirectFunctionCall1(textout,datum));
556543

557-
/* assume passwd has attlen -1 */
558-
off=att_addlength(off,-1,tp+off);
544+
/* assume passwd has attlen -1 */
545+
off=att_addlength(off,-1,tp+off);
546+
}
559547

560548
if (HeapTupleHasNulls(tuple)&&
561549
att_isnull(Anum_pg_shadow_valuntil-1,bp))
@@ -588,8 +576,11 @@ write_user_file(Relation urel)
588576
continue;
589577
}
590578

579+
/*
580+
* The file format is: "usename" usesysid "passwd" "valuntil"
581+
*/
591582
fputs_quote(usename,fp);
592-
fputs("",fp);
583+
fprintf(fp," %u",usesysid);
593584
fputs_quote(passwd,fp);
594585
fputs(" ",fp);
595586
fputs_quote(valuntil,fp);
@@ -664,17 +655,13 @@ BuildFlatFiles(bool database_only)
664655

665656
if (!database_only)
666657
{
667-
#ifdefNOT_YET
668-
/* XXX doesn't work yet for reasons stated above */
669-
670658
/* hard-wired path to pg_group */
671659
rnode.spcNode=GLOBALTABLESPACE_OID;
672660
rnode.dbNode=0;
673661
rnode.relNode=RelOid_pg_group;
674662

675663
rel=XLogOpenRelation(true,0,rnode);
676664
write_group_file(rel);
677-
#endif
678665

679666
/* hard-wired path to pg_shadow */
680667
rnode.spcNode=GLOBALTABLESPACE_OID;

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