~mdw / exim-config / blame
| Commit | Line | Data |
|---|---|---|
| 185b5456 MW |
1 | ### -*-m4-*- |
| 2 | ### | |
| 3 | ### Transmission to remote hosts 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 | ### Listen for incoming connections. | |
| 26 | ||
| d411be33 MW |
27 | SECTION(global, daemon)m4_dnl |
| 28 | daemon_smtp_ports = CONF_smtp_port : CONF_submission_port | |
| 29 | ||
| 185b5456 MW |
30 | SECTION(global, tls)m4_dnl |
| 31 | tls_certificate = CONF_sysconf_dir/server.cert | |
| 32 | tls_privatekey = CONF_sysconf_dir/server.key | |
| 33 | tls_advertise_hosts = * | |
| b6d74252 | 34 | tls_dhparam = CONF_ca_dir/dh-param-2048.pem |
| 185b5456 MW |
35 | tls_require_ciphers = ${if or {{={$received_port}{CONF_submission_port}} \ |
| 36 | {match_ip {$sender_host_address}{+trusted}}} \ | |
| 37 | {CONF_good_ciphers} \ | |
| 38 | {CONF_acceptable_ciphers}} | |
| 39 | tls_verify_certificates = CONF_ca_dir/ca.cert | |
| 40 | tls_verify_hosts = ${if eq{$acl_c_mode}{submission} {} {+allnets}} | |
| 41 | ||
| 42 | DIVERT(null) | |
| 43 | ###-------------------------------------------------------------------------- | |
| 44 | ### Check source addresses for apparently local senders. | |
| 45 | ||
| 46 | SECTION(acl, mail-hooks)m4_dnl | |
| 47 | ## Check that a submitted message's sender address is allowable. | |
| 48 | require acl = mail_client_addr | |
| 49 | ||
| 50 | ## Insist that a local client connect through TLS. | |
| 51 | deny message = Hosts within CONF_master_domain must use TLS | |
| 52 | !condition = ${if eq{$acl_c_mode}{submission}} | |
| 53 | hosts = +allnets | |
| 54 | !encrypted = * | |
| 55 | ||
| 56 | SECTION(acl, misc)m4_dnl | |
| 57 | mail_client_addr: | |
| 58 | ||
| 59 | ## If this is a message submission then that's handled elsewhere. | |
| 60 | accept condition = ${if eq{$acl_c_mode}{submission}} | |
| 61 | ||
| fd37fad5 MW |
62 | ## Make sure that the sender matches the client address. I feel like |
| 63 | ## I want to reject these, but that will break stuff. For example, | |
| 64 | ## if I send mail to an externally hosted address which is really a | |
| 65 | ## distribution list containing some local address, then we'll | |
| 66 | ## (approximately legitimately) receive mail with an apparently-local | |
| 67 | ## sender from a remote host. | |
| 68 | warn !hosts = ${LOOKUP_DOMAIN($sender_address_domain, | |
| 185b5456 MW |
69 | {KV(hosts, {$value}{+allnets})}, |
| 70 | {${if match_domain {$sender_address_domain} \ | |
| 71 | {+public} \ | |
| 72 | {+allnets}{! +allnets}}})} | |
| fd37fad5 MW |
73 | add_header = :after_received:X-Distorted-Warning: \ |
| 74 | RCLNTLSNDR \ | |
| 75 | Apparently local sender, but received from remote \ | |
| c1709c7f MW |
76 | server.\n\t\ |
| 77 | sender=$sender_address, \ | |
| 78 | host=$sender_host_address | |
| 185b5456 MW |
79 | |
| 80 | ## OK. | |
| 81 | accept | |
| 82 | ||
| 83 | DIVERT(null) | |
| 84 | ###-------------------------------------------------------------------------- | |
| 85 | ### The obvious trivial router. | |
| 86 | ||
| 87 | SECTION(routers, remote)m4_dnl | |
| 88 | ## Send mail on to a host in our own network. We must apply extra security. | |
| 89 | local: | |
| 90 | driver = dnslookup | |
| 91 | domains = ! +known : *.CONF_master_domain | |
| 92 | self = fail | |
| 93 | transport = smtp_local | |
| 94 | no_more | |
| 95 | ||
| 96 | ## Send mail on to unknown hosts. | |
| 97 | remote: | |
| 98 | driver = dnslookup | |
| 99 | domains = ! +known | |
| 100 | self = fail | |
| 101 | transport = smtp | |
| 102 | no_more | |
| 103 | ||
| 104 | DIVERT(null) | |
| 105 | ###----- That's all, folks -------------------------------------------------- |