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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 07:27:27 +00:00
parent 3d70b5d01a
commit bd62a211b5
1 changed files with 18 additions and 3 deletions
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21
src/backend/libpq/auth.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/libpq/auth.c,v 1.183 2009/06/25 11:30:08 mha Exp $
* $PostgreSQL: pgsql/src/backend/libpq/auth.c,v 1.183.2.1 2009/10/14 07:27:27 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@ -181,6 +181,21 @@ static int pg_SSPI_recvauth(Port *port);
#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
/*----------------------------------------------------------------
* Global authentication functions
@ -937,7 +952,7 @@ pg_GSS_recvauth(Port *port)
/* Get the actual GSS token */
initStringInfo(&buf);
if (pq_getmessage(&buf, 2000))
if (pq_getmessage(&buf, MAX_AUTH_TOKEN_LENGTH))
{
/* EOF - pq_getmessage already logged error */
pfree(buf.data);
@ -1175,7 +1190,7 @@ pg_SSPI_recvauth(Port *port)
/* Get the actual SSPI token */
initStringInfo(&buf);
if (pq_getmessage(&buf, 2000))
if (pq_getmessage(&buf, MAX_AUTH_TOKEN_LENGTH))
{
/* EOF - pq_getmessage already logged error */
pfree(buf.data);