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Fix bug reported by bobson: aclinsert3 would delete the 'world' entry

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from an ACL list if it had no permissions remaining, which confused
aclcheck terribly.  Also clean up code a little.
This commit is contained in:
Tom Lane 2000-11-03 19:01:36 +00:00
parent dfda21e7a6
commit aceec9ae1a
1 changed files with 38 additions and 32 deletions
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70
src/backend/utils/adt/acl.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/acl.c,v 1.51 2000/10/16 17:08:08 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/acl.c,v 1.52 2000/11/03 19:01:36 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -212,8 +212,7 @@ makeacl(int n)
if (n < 0)
elog(ERROR, "makeacl: invalid size: %d", n);
size = ACL_N_SIZE(n);
if (!(new_acl = (Acl *) palloc(size)))
elog(ERROR, "makeacl: palloc failed on %d", size);
new_acl = (Acl *) palloc(size);
MemSet((char *) new_acl, 0, size);
new_acl->size = size;
new_acl->ndim = 1;
@ -382,7 +381,7 @@ aclinsert3(Acl *old_acl, AclItem *mod_aip, unsigned modechg)
/* These checks for null input are probably dead code, but... */
if (!old_acl || ACL_NUM(old_acl) < 1)
old_acl = makeacl(0);
old_acl = makeacl(1);
if (!mod_aip)
{
new_acl = makeacl(ACL_NUM(old_acl));
@ -402,12 +401,13 @@ aclinsert3(Acl *old_acl, AclItem *mod_aip, unsigned modechg)
/* find the first element not less than the element to be inserted */
for (dst = 0; dst < num && aclitemgt(mod_aip, old_aip + dst); ++dst)
;
if (dst < num && aclitemeq(mod_aip, old_aip + dst))
{
/* modify in-place */
new_acl = makeacl(ACL_NUM(old_acl));
memcpy((char *) new_acl, (char *) old_acl, ACL_SIZE(old_acl));
new_acl = makeacl(num);
new_aip = ACL_DAT(new_acl);
memcpy((char *) new_acl, (char *) old_acl, ACL_SIZE(old_acl));
src = dst;
}
else
@ -420,24 +420,26 @@ aclinsert3(Acl *old_acl, AclItem *mod_aip, unsigned modechg)
}
else if (dst >= num)
{ /* end */
memmove((char *) new_aip,
(char *) old_aip,
num * sizeof(AclItem));
memcpy((char *) new_aip,
(char *) old_aip,
num * sizeof(AclItem));
}
else
{ /* middle */
memmove((char *) new_aip,
(char *) old_aip,
dst * sizeof(AclItem));
memmove((char *) (new_aip + dst + 1),
(char *) (old_aip + dst),
(num - dst) * sizeof(AclItem));
memcpy((char *) new_aip,
(char *) old_aip,
dst * sizeof(AclItem));
memcpy((char *) (new_aip + dst + 1),
(char *) (old_aip + dst),
(num - dst) * sizeof(AclItem));
}
new_aip[dst].ai_id = mod_aip->ai_id;
new_aip[dst].ai_idtype = mod_aip->ai_idtype;
num++; /* set num to the size of new_acl */
src = 0; /* world entry */
src = 0; /* if add or del, start from world entry */
}
/* apply the permissions mod */
switch (modechg)
{
case ACL_MODECHG_ADD:
@ -452,11 +454,11 @@ aclinsert3(Acl *old_acl, AclItem *mod_aip, unsigned modechg)
}
/*
* if the newly added entry has no permissions, delete it from the
* if the adjusted entry has no permissions, delete it from the
* list. For example, this helps in removing entries for users who no
* longer exist...
* longer exist. EXCEPTION: never remove the world entry.
*/
if (new_aip[dst].ai_mode == 0)
if (new_aip[dst].ai_mode == 0 && dst > 0)
{
int i;
@ -467,7 +469,7 @@ aclinsert3(Acl *old_acl, AclItem *mod_aip, unsigned modechg)
new_aip[i - 1].ai_mode = new_aip[i].ai_mode;
}
ARR_DIMS(new_acl)[0] = num - 1;
/* Adjust also the array size because it is used for memmove */
/* Adjust also the array size because it is used for memcpy */
ARR_SIZE(new_acl) -= sizeof(AclItem);
}
@ -500,7 +502,7 @@ aclremove(PG_FUNCTION_ARGS)
/* These checks for null input should be dead code, but... */
if (!old_acl || ACL_NUM(old_acl) < 1)
old_acl = makeacl(0);
old_acl = makeacl(1);
if (!mod_aip)
{
new_acl = makeacl(ACL_NUM(old_acl));
@ -511,11 +513,14 @@ aclremove(PG_FUNCTION_ARGS)
old_num = ACL_NUM(old_acl);
old_aip = ACL_DAT(old_acl);
/* Search for the matching entry */
for (dst = 0; dst < old_num && !aclitemeq(mod_aip, old_aip + dst); ++dst)
;
if (dst >= old_num)
{ /* not found or empty */
new_acl = makeacl(ACL_NUM(old_acl));
{
/* Not found, so return copy of source ACL */
new_acl = makeacl(old_num);
memcpy((char *) new_acl, (char *) old_acl, ACL_SIZE(old_acl));
}
else
@ -529,20 +534,21 @@ aclremove(PG_FUNCTION_ARGS)
}
else if (dst == old_num - 1)
{ /* end */
memmove((char *) new_aip,
(char *) old_aip,
new_num * sizeof(AclItem));
memcpy((char *) new_aip,
(char *) old_aip,
new_num * sizeof(AclItem));
}
else
{ /* middle */
memmove((char *) new_aip,
(char *) old_aip,
dst * sizeof(AclItem));
memmove((char *) (new_aip + dst),
(char *) (old_aip + dst + 1),
(new_num - dst) * sizeof(AclItem));
memcpy((char *) new_aip,
(char *) old_aip,
dst * sizeof(AclItem));
memcpy((char *) (new_aip + dst),
(char *) (old_aip + dst + 1),
(new_num - dst) * sizeof(AclItem));
}
}
PG_RETURN_ACL_P(new_acl);
}