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Heikki Linnakangas eb61136dc7 Remove support for password_encryption='off' / 'plain'. 
Storing passwords in plaintext hasn't been a good idea for a very long
time, if ever. Now seems like a good time to finally forbid it, since we're
messing with this in PostgreSQL 10 anyway.

Remove the CREATE/ALTER USER UNENCRYPTED PASSSWORD 'foo' syntax, since
storing passwords unencrypted is no longer supported. ENCRYPTED PASSWORD
'foo' is still accepted, but ENCRYPTED is now just a noise-word, it does
the same as just PASSWORD 'foo'.

Likewise, remove the --unencrypted option from createuser, but accept
--encrypted as a no-op for backward compatibility. AFAICS, --encrypted was
a no-op even before this patch, because createuser encrypted the password
before sending it to the server even if --encrypted was not specified. It
added the ENCRYPTED keyword to the SQL command, but since the password was
already in encrypted form, it didn't make any difference. The documentation
was not clear on whether that was intended or not, but it's moot now.

Also, while password_encryption='on' is still accepted as an alias for
'md5', it is now marked as hidden, so that it is not listed as an accepted
value in error hints, for example. That's not directly related to removing
'plain', but it seems better this way.

Reviewed by Michael Paquier

Discussion: https://www.postgresql.org/message-id/16e9b768-fd78-0b12-cfc1-7b6b7f238fde@iki.fi
 		2017-05-08 11:26:07 +03:00
..
Makefile Support SCRAM-SHA-256 authentication (RFC 5802 and 7677). 2017-03-07 14:25:40 +02:00
README.SSL Remove useless whitespace at end of lines 2010-11-23 22:34:55 +02:00
auth-scram.c Remove support for password_encryption='off' / 'plain'. 2017-05-08 11:26:07 +03:00
auth.c Remove support for password_encryption='off' / 'plain'. 2017-05-08 11:26:07 +03:00
be-fsstubs.c Use wrappers of PG_DETOAST_DATUM_PACKED() more. 2017-03-12 19:35:34 -04:00
be-secure-openssl.c Re-allow SSL passphrase prompt at server start, but not thereafter. 2017-01-04 12:44:03 -05:00
be-secure.c Re-allow SSL passphrase prompt at server start, but not thereafter. 2017-01-04 12:44:03 -05:00
crypt.c Remove support for password_encryption='off' / 'plain'. 2017-05-08 11:26:07 +03:00
hba.c Rename "scram" to "scram-sha-256" in pg_hba.conf and password_encryption. 2017-04-18 14:50:50 +03:00
ifaddr.c Remove some configure header-file checks that we weren't really using. 2017-02-25 18:10:09 -05:00
pg_hba.conf.sample Rename "scram" to "scram-sha-256" in pg_hba.conf and password_encryption. 2017-04-18 14:50:50 +03:00
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 Remove symbol WIN32_ONLY_COMPILER 2017-04-11 15:22:21 +02:00
pqformat.c Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
pqmq.c Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
pqsignal.c Update copyright via script for 2017 2017-01-03 13:48:53 -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

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