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GSSAPI encryption support

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On both the frontend and backend, prepare for GSSAPI encryption
support by moving common code for error handling into a separate file.
Fix a TODO for handling multiple status messages in the process.
Eliminate the OIDs, which have not been needed for some time.

Add frontend and backend encryption support functions.  Keep the
context initiation for authentication-only separate on both the
frontend and backend in order to avoid concerns about changing the
requested flags to include encryption support.

In postmaster, pull GSSAPI authorization checking into a shared
function.  Also share the initiator name between the encryption and
non-encryption codepaths.

For HBA, add "hostgssenc" and "hostnogssenc" entries that behave
similarly to their SSL counterparts.  "hostgssenc" requires either
"gss", "trust", or "reject" for its authentication.

Similarly, add a "gssencmode" parameter to libpq.  Supported values are
"disable", "require", and "prefer".  Notably, negotiation will only be
attempted if credentials can be acquired.  Move credential acquisition
into its own function to support this behavior.

Add a simple pg_stat_gssapi view similar to pg_stat_ssl, for monitoring
if GSSAPI authentication was used, what principal was used, and if
encryption is being used on the connection.

Finally, add documentation for everything new, and update existing
documentation on connection security.

Thanks to Michael Paquier for the Windows fixes.

Author: Robbie Harwood, with changes to the read/write functions by me.
Reviewed in various forms and at different times by: Michael Paquier,
   Andres Freund, David Steele.
Discussion: https://www.postgresql.org/message-id/flat/jlg1tgq1ktm.fsf@thriss.redhat.com
This commit is contained in:
Stephen Frost
2019-04-03 15:02:33 -04:00
parent 5f6fc34af5
commit b0b39f72b9
35 changed files with 2575 additions and 197 deletions
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40
src/backend/postmaster/postmaster.c
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@@ -1889,9 +1889,12 @@ initMasks(fd_set *rmask)
* if that's what you want. Return STATUS_ERROR if you don't want to
* send anything to the client, which would typically be appropriate
* if we detect a communications failure.)
*
* Set secure_done when negotiation of an encrypted layer (currently, TLS or
* GSSAPI) is already completed.
*/
static int
ProcessStartupPacket(Port *port, bool SSLdone)
ProcessStartupPacket(Port *port, bool secure_done)
{
int32 len;
void *buf;
@@ -1924,9 +1927,10 @@ ProcessStartupPacket(Port *port, bool SSLdone)
if (pq_getbytes(((char *) &len) + 1, 3) == EOF)
{
/* Got a partial length word, so bleat about that */
ereport(COMMERROR,
(errcode(ERRCODE_PROTOCOL_VIOLATION),
errmsg("incomplete startup packet")));
if (!secure_done)
ereport(COMMERROR,
(errcode(ERRCODE_PROTOCOL_VIOLATION),
errmsg("incomplete startup packet")));
return STATUS_ERROR;
}
@@ -1975,7 +1979,7 @@ ProcessStartupPacket(Port *port, bool SSLdone)
return STATUS_ERROR;
}
if (proto == NEGOTIATE_SSL_CODE && !SSLdone)
if (proto == NEGOTIATE_SSL_CODE && !secure_done)
{
char SSLok;
@@ -2008,6 +2012,32 @@ retry1:
/* but not another SSL negotiation request */
return ProcessStartupPacket(port, true);
}
else if (proto == NEGOTIATE_GSS_CODE && !secure_done)
{
char GSSok = 'N';
#ifdef ENABLE_GSS
/* No GSSAPI encryption when on Unix socket */
if (!IS_AF_UNIX(port->laddr.addr.ss_family))
GSSok = 'G';
#endif
while (send(port->sock, &GSSok, 1, 0) != 1)
{
if (errno == EINTR)
continue;
ereport(COMMERROR,
(errcode_for_socket_access(),
errmsg("failed to send GSSAPI negotiation response: %m)")));
return STATUS_ERROR; /* close the connection */
}
#ifdef ENABLE_GSS
if (GSSok == 'G' && secure_open_gssapi(port) == -1)
return STATUS_ERROR;
#endif
/* Won't ever see more than one negotiation request */
return ProcessStartupPacket(port, true);
}
/* Could add additional special packet types here */