postgresql

History

Tom Lane 0245f8db36 Pre-beta mechanical code beautification. Run pgindent, pgperltidy, and reformat-dat-files. This set of diffs is a bit larger than typical. We've updated to pg_bsd_indent 2.1.2, which properly indents variable declarations that have multi-line initialization expressions (the continuation lines are now indented one tab stop). We've also updated to perltidy version 20230309 and changed some of its settings, which reduces its desire to add whitespace to lines to make assignments etc. line up. Going forward, that should make for fewer random-seeming changes to existing code. Discussion: https://postgr.es/m/20230428092545.qfb3y5wcu4cm75ur@alvherre.pgsql		2023-05-19 17:24:48 -04:00
..
Makefile	Refactor SASL code with a generic interface for its mechanisms	2021-07-07 10:55:15 +09:00
README.SSL	Move EDH support to common files	2018-01-23 07:11:38 -05:00
auth-sasl.c	Update copyright for 2023	2023-01-02 15:00:37 -05:00
auth-scram.c	Make SCRAM iteration count configurable	2023-03-27 09:46:29 +02:00
auth.c	Explicitly require MIT Kerberos for GSSAPI	2023-04-13 08:55:13 -04:00
be-fsstubs.c	New header varatt.h split off from postgres.h	2023-01-10 05:54:36 +01:00
be-gssapi-common.c	De-Revert "Add support for Kerberos credential delegation"	2023-04-13 08:55:07 -04:00
be-secure-common.c	Common function for percent placeholder replacement	2023-01-11 10:42:35 +01:00
be-secure-gssapi.c	Pre-beta mechanical code beautification.	2023-05-19 17:24:48 -04:00
be-secure-openssl.c	Pre-beta mechanical code beautification.	2023-05-19 17:24:48 -04:00
be-secure.c	Update copyright for 2023	2023-01-02 15:00:37 -05:00
crypt.c	Update copyright for 2023	2023-01-02 15:00:37 -05:00
hba.c	Pre-beta mechanical code beautification.	2023-05-19 17:24:48 -04:00
ifaddr.c	Update copyright for 2023	2023-01-02 15:00:37 -05:00
meson.build	Update copyright for 2023	2023-01-02 15:00:37 -05:00
pg_hba.conf.sample	Add description for new patterns supported in HBA and ident sample files	2023-02-16 07:38:52 +09:00
pg_ident.conf.sample	Add description for new patterns supported in HBA and ident sample files	2023-02-16 07:38:52 +09:00
pqcomm.c	Don't leak descriptors into subprograms.	2023-03-03 10:43:33 +13:00
pqformat.c	Change argument type of pq_sendbytes from char * to void *	2023-02-14 13:32:19 +01:00
pqmq.c	Perform apply of large transactions by parallel workers.	2023-01-09 07:52:45 +05:30
pqsignal.c	Use WaitEventSet API for postmaster's event loop.	2023-01-12 16:32:20 +13:00

README.SSL

src/backend/libpq/README.SSL

SSL
===

>From the servers perspective:


  Receives StartupPacket
           |
           |
 (Is SSL_NEGOTIATE_CODE?) -----------  Normal startup
           |                  No
           |
           | Yes
           |
           |
 (Server compiled with USE_SSL?) ------- Send 'N'
           |                       No        |
           |                                 |
           | Yes                         Normal startup
           |
           |
        Send 'S'
           |
           |
      Establish SSL
           |
           |
      Normal startup





>From the clients perspective (v6.6 client _with_ SSL):


      Connect
         |
         |
  Send packet with SSL_NEGOTIATE_CODE
         |
         |
  Receive single char  ------- 'S' -------- Establish SSL
         |                                       |
         | '<else>'                              |
         |                                  Normal startup
         |
         |
   Is it 'E' for error  ------------------- Retry connection
         |                  Yes             without SSL
         | No
         |
   Is it 'N' for normal ------------------- Normal startup
         |                  Yes
         |
   Fail with unknown

---------------------------------------------------------------------------

Ephemeral DH
============

Since the server static private key ($DataDir/server.key) will
normally be stored unencrypted so that the database backend can
restart automatically, it is important that we select an algorithm
that continues to provide confidentiality even if the attacker has the
server's private key.  Ephemeral DH (EDH) keys provide this and more
(Perfect Forward Secrecy aka PFS).

N.B., the static private key should still be protected to the largest
extent possible, to minimize the risk of impersonations.

Another benefit of EDH is that it allows the backend and clients to
use DSA keys.  DSA keys can only provide digital signatures, not
encryption, and are often acceptable in jurisdictions where RSA keys
are unacceptable.

The downside to EDH is that it makes it impossible to use ssldump(1)
if there's a problem establishing an SSL session.  In this case you'll
need to temporarily disable EDH (see initialize_dh()).