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Raise the maximum authentication token (Kerberos ticket) size in GSSAPI

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and SSPI athentication methods. While the old 2000 byte limit was more than
enough for Unix Kerberos implementations, tickets issued by Windows Domain
Controllers can be much larger.

Ian Turner
This commit is contained in:
Heikki Linnakangas 2009-10-14 07:27:44 +00:00
parent c2c86e4881
commit c6b4d4fbc8
1 changed files with 17 additions and 3 deletions
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20
src/backend/libpq/auth.c
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@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/libpq/auth.c,v 1.164.2.2 2009/06/25 11:30:12 mha Exp $ * $PostgreSQL: pgsql/src/backend/libpq/auth.c,v 1.164.2.3 2009/10/14 07:27:44 heikki Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -90,6 +90,20 @@ ULONG(*__ldap_start_tls_sA) (
static int CheckLDAPAuth(Port *port); static int CheckLDAPAuth(Port *port);
#endif #endif
/*
* Maximum size of GSS and SSPI authentication tokens.
*
* Kerberos tickets are usually quite small, but the TGTs issued by Windows
* domain controllers include an authorization field known as the Privilege
* Attribute Certificate (PAC), which contains the user's Windows permissions
* (group memberships etc.). The PAC is copied into all tickets obtained on
* the basis of this TGT (even those issued by Unix realms which the Windows
* realm trusts), and can be several kB in size. The maximum token size
* accepted by Windows systems is determined by the MaxAuthToken Windows
* registry setting. Microsoft recommends that it is not set higher than
* 65535 bytes, so that seems like a reasonable limit for us as well.
*/
#define MAX_AUTH_TOKEN_LENGTH 65535
#ifdef KRB5 #ifdef KRB5
/*---------------------------------------------------------------- /*----------------------------------------------------------------
@ -463,7 +477,7 @@ pg_GSS_recvauth(Port *port)
/* Get the actual GSS token */ /* Get the actual GSS token */
initStringInfo(&buf); initStringInfo(&buf);
if (pq_getmessage(&buf, 2000)) if (pq_getmessage(&buf, MAX_AUTH_TOKEN_LENGTH))
{ {
/* EOF - pq_getmessage already logged error */ /* EOF - pq_getmessage already logged error */
pfree(buf.data); pfree(buf.data);
@ -725,7 +739,7 @@ pg_SSPI_recvauth(Port *port)
/* Get the actual SSPI token */ /* Get the actual SSPI token */
initStringInfo(&buf); initStringInfo(&buf);
if (pq_getmessage(&buf, 2000)) if (pq_getmessage(&buf, MAX_AUTH_TOKEN_LENGTH))
{ {
/* EOF - pq_getmessage already logged error */ /* EOF - pq_getmessage already logged error */
pfree(buf.data); pfree(buf.data);