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Code cleanup of user name and user id handling in the backend. The current

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user is now defined in terms of the user id, the user name is only computed
upon request (for display purposes). This is kind of the opposite of the
previous state, which would maintain the user name and compute the user id
for permission checks.

Besides perhaps saving a few cycles (integer vs string), this now creates a
single point of attack for changing the user id during a connection, for
purposes of "setuid" functions, etc.
This commit is contained in:
Peter Eisentraut
2000-09-06 14:15:31 +00:00
parent daf1e3a702
commit 6dc249610a
28 changed files with 220 additions and 281 deletions
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76
src/backend/utils/init/miscinit.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/init/miscinit.c,v 1.53 2000/08/03 16:34:24 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/init/miscinit.c,v 1.54 2000/09/06 14:15:22 petere Exp $
*
*-------------------------------------------------------------------------
*/
@ -273,44 +273,24 @@ convertstr(unsigned char *buff, int len, int dest)
#endif
/* ----------------
* GetPgUserName and SetPgUserName
*
* SetPgUserName must be called before InitPostgres, since the setuid()
* is done there.
* GetPgUserName
* ----------------
*/
char *
GetPgUserName(void)
{
return UserName;
HeapTuple tuple;
Oid userid;
userid = GetUserId();
tuple = SearchSysCacheTuple(SHADOWSYSID, ObjectIdGetDatum(userid), 0, 0, 0);
if (!HeapTupleIsValid(tuple))
elog(ERROR, "invalid user id %u", (unsigned) userid);
return pstrdup( NameStr(((Form_pg_shadow) GETSTRUCT(tuple))->usename) );
}
void
SetPgUserName(void)
{
#ifndef NO_SECURITY
char *p;
struct passwd *pw;
if (IsUnderPostmaster)
{
/* use the (possibly) authenticated name that's provided */
if (!(p = getenv("PG_USER")))
elog(FATAL, "SetPgUserName: PG_USER environment variable is unset");
}
else
{
/* setuid() has not yet been done, see above comment */
if (!(pw = getpwuid(geteuid())))
elog(FATAL, "SetPgUserName: no entry in host passwd file");
p = pw->pw_name;
}
if (UserName)
free(UserName);
UserName = malloc(strlen(p) + 1);
strcpy(UserName, p);
#endif /* NO_SECURITY */
}
/* ----------------------------------------------------------------
* GetUserId and SetUserId
@ -318,42 +298,42 @@ SetPgUserName(void)
*/
static Oid UserId = InvalidOid;
int
Oid
GetUserId()
{
AssertState(OidIsValid(UserId));
return UserId;
}
void
SetUserId()
SetUserId(Oid newid)
{
UserId = newid;
}
void
SetUserIdFromUserName(const char *username)
{
HeapTuple userTup;
char *userName;
AssertState(!OidIsValid(UserId)); /* only once */
/*
* Don't do scans if we're bootstrapping, none of the system catalogs
* exist yet, and they should be owned by postgres anyway.
*/
if (IsBootstrapProcessingMode())
{
UserId = geteuid();
return;
}
AssertState(!IsBootstrapProcessingMode());
userName = GetPgUserName();
userTup = SearchSysCacheTuple(SHADOWNAME,
PointerGetDatum(userName),
PointerGetDatum(username),
0, 0, 0);
if (!HeapTupleIsValid(userTup))
elog(FATAL, "SetUserId: user '%s' is not in '%s'",
userName,
ShadowRelationName);
UserId = (Oid) ((Form_pg_shadow) GETSTRUCT(userTup))->usesysid;
elog(FATAL, "user \"%s\" does not exist", username);
SetUserId( ((Form_pg_shadow) GETSTRUCT(userTup))->usesysid );
}
/*-------------------------------------------------------------------------
*
* posmaster pid file stuffs. $DATADIR/postmaster.pid is created when: