mdw@git.distorted.org.uk Git - exim-config/blob - auth.m4

   1 ### -*-m4-*-
   2 ###
   3 ### Client authentication for distorted.org.uk Exim configuration
   4 ###
   5 ### (c) 2012 Mark Wooding
   6 ###
   7
   8 ###----- Licensing notice ---------------------------------------------------
   9 ###
  10 ### This program is free software; you can redistribute it and/or modify
  11 ### it under the terms of the GNU General Public License as published by
  12 ### the Free Software Foundation; either version 2 of the License, or
  13 ### (at your option) any later version.
  14 ###
  15 ### This program is distributed in the hope that it will be useful,
  16 ### but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ### GNU General Public License for more details.
  19 ###
  20 ### You should have received a copy of the GNU General Public License
  21 ### along with this program; if not, write to the Free Software Foundation,
  22 ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23
  24 ###--------------------------------------------------------------------------
  25 ### Authenticators.
  26
  27 m4_define(<:CHECK_PASSWD:>,
  28 <:${lookup {$1} lsearch {CONF_sysconf_dir/passwd} \
  29            {${if crypteq {$2} {$value}}} \
  30            {false}}:>)
  31
  32 m4_define(<:ALLOW_PLAINTEXT_AUTH_P:>,
  33 <:or {{match_ip {$sender_host_address}{+localnet}} \
  34       {and {{def:tls_cipher} {eq{$acl_c_mode}{submission}}}}}:>)
  35
  36 SECTION(auth)m4_dnl
  37 plain:
  38         driver = plaintext
  39         public_name = PLAIN
  40         server_advertise_condition = ${if ALLOW_PLAINTEXT_AUTH_P}
  41         server_prompts = :
  42         server_condition = CHECK_PASSWD($auth2, $auth3)
  43         server_set_id = $auth2
  44
  45 login:
  46         driver = plaintext
  47         public_name = LOGIN
  48         server_advertise_condition = ${if ALLOW_PLAINTEXT_AUTH_P}
  49         server_prompts = <; Username: ; Password:
  50         server_condition = CHECK_PASSWD($auth1, $auth2)
  51         server_set_id = $auth1
  52
  53 DIVERT(null)
  54 ###--------------------------------------------------------------------------
  55 ### Dealing with `AUTH' parameters and relaying.
  56
  57 SECTION(global, acl)m4_dnl
  58 acl_smtp_mailauth = mailauth
  59 SECTION(acl, misc)m4_dnl
  60 ## Check the `AUTH=...' parameter to a `MAIL' command.
  61 mailauth:
  62         ## If the client has authenticated using TLS then we're OK.  The
  63         ## sender was presumably checked upstream, and we can believe that
  64         ## the name has been transmitted honestly.
  65         accept    condition = ${if def:tls_peerdn}
  66
  67         ## If this is submission, and the client has authenticated, then we
  68         ## check that the name matches the user.
  69         accept    condition = ${if eq {$authenticated_sender} \
  70                                       {$authenticated_id@CONF_master_domain}}
  71
  72         ## Otherwise we can't tell who really sent it.
  73         deny      message = Authenticated user not authoritative for claimed sender.
  74
  75 DIVERT(null)
  76 ###----- That's all, folks --------------------------------------------------