postgresql

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Bruce Momjian ac5852fb30 gss: add missing references to hostgssenc and hostnogssenc These were missed when these were added to pg_hba.conf in PG 12; updates docs and pg_hba.conf.sample. Reported-by: Arthur Nascimento Bug: 16380 Discussion: https://postgr.es/m/20200421182736.GG19613@momjian.us Backpatch-through: 12		2020-05-25 20:19:28 -04:00
..
Makefile	Split all OBJS style lines in makefiles into one-line-per-entry style.	2019-11-05 14:41:07 -08:00
README.SSL	Move EDH support to common files	2018-01-23 07:11:38 -05:00
auth-scram.c	Initial pgindent and pgperltidy run for v13.	2020-05-14 13:06:50 -04:00
auth.c	Dial back -Wimplicit-fallthrough to level 3	2020-05-13 15:31:14 -04:00
be-fsstubs.c	Update copyrights for 2020	2020-01-01 12:21:45 -05:00
be-gssapi-common.c	Update copyrights for 2020	2020-01-01 12:21:45 -05:00
be-secure-common.c	Update copyrights for 2020	2020-01-01 12:21:45 -05:00
be-secure-gssapi.c	Fix severe memory leaks in GSSAPI encryption support.	2020-05-05 13:10:17 -04:00
be-secure-openssl.c	Run pgindent with new pg_bsd_indent version 2.1.1.	2020-05-16 11:54:51 -04:00
be-secure.c	Update copyrights for 2020	2020-01-01 12:21:45 -05:00
crypt.c	Initial pgindent and pgperltidy run for v13.	2020-05-14 13:06:50 -04:00
hba.c	Introduce macros for typalign and typstorage constants.	2020-03-04 10:34:25 -05:00
ifaddr.c	Update copyrights for 2020	2020-01-01 12:21:45 -05:00
pg_hba.conf.sample	gss: add missing references to hostgssenc and hostnogssenc	2020-05-25 20:19:28 -04:00
pg_ident.conf.sample	Reformat the comments in pg_hba.conf and pg_ident.conf	2010-01-26 06:58:39 +00:00
pqcomm.c	Assume that we have utime() and <utime.h>.	2020-02-21 14:30:47 -05:00
pqformat.c	Update copyrights for 2020	2020-01-01 12:21:45 -05:00
pqmq.c	Update copyrights for 2020	2020-01-01 12:21:45 -05:00
pqsignal.c	Update copyrights for 2020	2020-01-01 12:21:45 -05:00

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()).