From 36ca94365b5ccf4c5e540d1b531ba0915e7ed2c6 Mon Sep 17 00:00:00 2001 From: Adar Nimrod Date: Mon, 23 Nov 2020 10:38:26 +0200 Subject: [PATCH] Accumulation of work. Basically, just what I did since the last commit. Includes the Exim4 SMTP server. --- .pre-commit-config.yaml | 9 +- clamd/Dockerfile | 1 + docker-compose.yml | 69 ++- dovecot/Dockerfile | 3 +- dovecot/entrypoint | 4 +- dovecot/nimrod.sieve | 96 ++-- dovecot/patch.diff | 71 +-- exim4/.dockerignore | 4 + exim4/Dockerfile | 35 ++ exim4/README.md | 35 ++ exim4/aliases | 13 + exim4/entrypoint | 33 ++ exim4/exim4.conf | 1026 +++++++++++++++++++++++++++++++++++++++ 13 files changed, 1291 insertions(+), 108 deletions(-) create mode 100644 exim4/.dockerignore create mode 100644 exim4/Dockerfile create mode 100644 exim4/README.md create mode 100644 exim4/aliases create mode 100755 exim4/entrypoint create mode 100644 exim4/exim4.conf diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml index 9c6aa38..6e18404 100644 --- a/.pre-commit-config.yaml +++ b/.pre-commit-config.yaml @@ -5,7 +5,6 @@ repos: rev: v2.3.0 hooks: - id: check-added-large-files - - id: check-executables-have-shebangs - id: check-merge-conflict - id: detect-private-key - id: trailing-whitespace @@ -20,17 +19,13 @@ repos: - id: proselint types: [plain-text] exclude: LICENSE - - repo: https://www.shore.co.il/git/shell-pre-commit/ - rev: v0.6.0 - hooks: - - id: shell-lint - - id: shellcheck - repo: https://www.shore.co.il/git/docker-pre-commit rev: v0.3.0 hooks: - - id: hadolint - id: docker-compose + - id: hadolint - repo: https://github.com/Yelp/detect-secrets rev: v0.13.0 hooks: - id: detect-secrets + exclude: \.diff$ diff --git a/clamd/Dockerfile b/clamd/Dockerfile index 3b45d51..a589e1f 100644 --- a/clamd/Dockerfile +++ b/clamd/Dockerfile @@ -2,6 +2,7 @@ FROM debian:buster-slim # hadolint ignore=DL3008 RUN apt-get update && \ DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \ + ca-certificates \ clamav-daemon \ clamav-freshclam \ netcat-openbsd \ diff --git a/docker-compose.yml b/docker-compose.yml index ca3ee41..c851b0c 100644 --- a/docker-compose.yml +++ b/docker-compose.yml @@ -6,29 +6,43 @@ services: build: context: dovecot/ environment: - LDAP_BASEDN: &ldap_basedn 'dc=nowhere,dc=com' - LDAP_URIS: &ldap_uris ldap://slapd + LDAP_BASEDN: &ldap_basedn |- + ${LDAP_BASE_DN:-ou=People,dc=shore,dc=co,dc=il} + LDAP_URIS: &ldap_uris '${LDAP_URIS:-ldapi:///}' + TLS_CERT_FILE: &tls_cert_file /var/ssl/mail.crt + TLS_KEY_FILE: &tls_key_file /var/ssl/mail.key + hostname: &imap_hostname imap.shore.co.il + networks: + default: + aliases: + - *imap_hostname ports: - 993:993 + restart: always volumes: + - _run_slapd:/run/slapd - _run_dovecot:/run/dovecot - mail:/var/mail + - /var/ssl:/var/ssl:ro clamd: build: - cache_from: - - adarnimrod/clamd + # cache_from: + # - adarnimrod/clamd context: clamd/ - image: adarnimrod/clamd + # image: adarnimrod/clamd + restart: always volumes: - _run_clamav:/run/clamav + - spool:/var/spool/exim4 spamd: build: - cache_from: - - adarnimrod/spamd + # cache_from: + # - adarnimrod/spamd context: spamd/ - image: adarnimrod/spamd + # image: adarnimrod/spamd + restart: always volumes: - _run_spamd:/run/spamd - mail:/var/mail:ro @@ -37,19 +51,58 @@ services: crond: build: context: crond/ + restart: always volumes: - /run/docker.sock:/run/docker.sock + smtp: + build: + context: exim4/ + environment: + # CLAMD_ADDRESS: clamd 3310 + LDAP_URIS: *ldap_uris + LDAP_BASEDN: *ldap_basedn + # LMTP_ADDRESS: /run/dovecot/lmtp + DOMAIN: &domain "${DOMAIN:-shore.co.il}" + MAILNAME: &mailname "${MAILNAME:-smtp}.${DOMAIN:-shore.co.il}" + ROOT_ALIAS: "${ROOT_ALIAS:-nimrod}" + # SPAMD_ADDRESS: /run/spamd/spamd.sock + TLS_CERT_FILE: *tls_cert_file + TLS_KEY_FILE: *tls_key_file + DKIM_KEY_FILE: /var/ssl/dkim.key + DKIM_SELECTOR: host01 + hostname: *mailname + networks: + default: + aliases: + - *mailname + ports: + - '25:25' + - 587:587 + restart: always + volumes: + - _run_slapd:/run/slapd + - _run_clamav:/run/clamav + - _run_dovecot:/run/dovecot + - _run_spamd:/run/spamd + - spool:/var/spool/exim4 + - /var/ssl:/var/ssl:ro + volumes: _run_spamd: _run_clamav: + name: run_clamav _run_dovecot: mail: labels: snapshot: 'true' + spool: sa_learn: labels: snapshot: 'true' + _run_slapd: + external: true + name: run_slapd networks: default: diff --git a/dovecot/Dockerfile b/dovecot/Dockerfile index 2850089..f38a3d3 100644 --- a/dovecot/Dockerfile +++ b/dovecot/Dockerfile @@ -17,6 +17,7 @@ RUN apt-get update && \ ssl-cert \ time \ && \ + install -d -m 777 -o mail -g mail /var/lib/dovecot/sieve.d && \ rm -rf /tmp/* /var/tmp/* /var/lib/apt/lists/* /var/cache/apt/archives/* COPY --from=delete_to_trash /dovecot_deleted_to_trash/lib_deleted_to_trash_plugin.so /usr/lib/dovecot/modules/ COPY --from=delete_to_trash /dovecot_deleted_to_trash/95-deleted_to_trash_plugin.conf /etc/dovecot/conf.d/ @@ -32,4 +33,4 @@ VOLUME /run/dovecot EXPOSE 993 25 ENTRYPOINT [ "/entrypoint" ] CMD [ "dovecot", "-F" ] -HEALTHCHECK CMD doveadm service status || exit 1 +HEALTHCHECK --start-period=5m CMD doveadm service status || exit 1 diff --git a/dovecot/entrypoint b/dovecot/entrypoint index b3905bf..63fd14f 100755 --- a/dovecot/entrypoint +++ b/dovecot/entrypoint @@ -4,7 +4,7 @@ set -eux install -d -m 755 -o dovecot -g root /var/run/dovecot install -d -m 775 -o root -g dovecot /var/mail install -d -m 775 -o root -g dovecot /run/dovecot -time openssl dhparam -out /usr/share/dovecot/dh.pem 4096 +time openssl dhparam -out /usr/share/dovecot/dh.pem 2048 DEBIAN_FRONTEND=noninteractive time make-ssl-cert generate-default-snakeoil --force-overwrite # I don't know why environment variables aren't expanded and I'm too interested @@ -12,5 +12,7 @@ DEBIAN_FRONTEND=noninteractive time make-ssl-cert generate-default-snakeoil --fo sed -i "s@%{env:LDAP_URIS}@$LDAP_URIS@g" /etc/dovecot/dovecot-ldap.conf.ext sed -i "s@%{env:LDAP_BASEDN}@$LDAP_BASEDN@g" /etc/dovecot/dovecot-ldap.conf.ext +sed -i "s@/etc/ssl/private/ssl-cert-snakeoil.key@$TLS_KEY_FILE@g" /etc/dovecot/conf.d/10-ssl.conf +sed -i "s@/etc/ssl/certs/ssl-cert-snakeoil.pem@$TLS_CERT_FILE@g" /etc/dovecot/conf.d/10-ssl.conf eval exec "$@" diff --git a/dovecot/nimrod.sieve b/dovecot/nimrod.sieve index f1685ba..dadec51 100644 --- a/dovecot/nimrod.sieve +++ b/dovecot/nimrod.sieve @@ -8,92 +8,64 @@ if address :is :domain "from" [ "drushim.co.il", "indeed.com", "picaro.co.il", "niloosoft.com", "qhr.co.il", "dialog.co.il", "taldor.co.il", "linkedin.com", "*.linkedin.com", "hire.withgoogle.com" , "hunterhrms.com", "triplebyte.com", "gun.io", "lever.co", "*.lever.co", "logica-it.co.il", "lever.co", "*.lever.co", -"woo.io" ] +"woo.io", "myworkday.com", "*.myworkday.com", "experteer.com", +"*.experteer.com", "hunted.co.il", "remote.com", "itworks.org.il" ] { fileinto "Wanted"; } elsif anyof ( - address :is :domain "from" [ "puppetlabs.com", "drivehq.com", "bsdmag.org", "macecraft.com", "rol.co.il", "pointmail.co.za", "agora.co.il", "bsdmag.com", "check.me", "dvorak.org", "perlmaven.com", "itnewsletter.co.il", "aerofs.com", "lastpass.com", "openstack-israel.org", "sdjournal.org", "htisrael.co.il", "github.com", "marriott-email.com", "meetup.com", "8662244.co.il", "software.com.pl", "heroku.com", "eg-innovations.net", "email-marriott.com", "info.docker.com", "docker.com", "docker.io", "onedrive.microsoft.com", "aerofs.com", "m.aerofs.com", "airbnb.com", "circleci.com", "bugs.debian.org", "getcloudify.com", "mqg.org.il", "samerica.co.il", "gigaspaces.com", "getcloudify.org", "email.aol.com", "maccabi-news.co.il", "microfocus.com", "*.microfocus.com", "statscraft.org.il", "novell.com" ], - address :is "from" [ "ecomeshek@gmail.com", "ironethaifa@haifa.muni.il" ], + address :is :domain "from" [ "community.popcorncomputer.com", "puppet.com", +"devopsdays.org", "teleticket.co.il", "puppetlabs.com", "drivehq.com", +"bsdmag.org", "macecraft.com", "rol.co.il", "pointmail.co.za", "agora.co.il", +"bsdmag.com", "check.me", "dvorak.org", "perlmaven.com", "itnewsletter.co.il", +"aerofs.com", "lastpass.com", "openstack-israel.org", "sdjournal.org", +"htisrael.co.il", "github.com", "marriott-email.com", "meetup.com", +"8662244.co.il", "software.com.pl", "heroku.com", "eg-innovations.net", +"email-marriott.com", "info.docker.com", "docker.com", "docker.io", +"onedrive.microsoft.com", "aerofs.com", "m.aerofs.com", "airbnb.com", +"circleci.com", "bugs.debian.org", "getcloudify.com", "mqg.org.il", +"samerica.co.il", "gigaspaces.com", "getcloudify.org", "email.aol.com", +"microfocus.com", "*.microfocus.com", "statscraft.org.il", "novell.com", +"mozilla.org", "*.mozilla.org", "htmag.co.il" ], + address :is "from" [ "ecomeshek@gmail.com", "ironethaifa@haifa.muni.il", "cloudnativeisrael@gmail.com" ], address :is :domain "to" [ "openbsd.org", "meetup.com" ]) { - fileinto "Mailing lists"; + fileinto "Mailinglists"; } -elsif address :is :domain "from" [ "paypal.co.il", "paypal.com", "*.paypal.co.il", "*.paypal.com" ] -{ - fileinto "PayPal"; -} -elsif address :is :domain "from" [ "amazon.com", "*.amazon.com" ] -{ - fileinto "Amazon"; -} -elsif anyof (address :is :domain "from" [ "travelbird.be", "nitzan-hr.com", "ispc.co.il", "meckano.co.il", "kustonline.be", "freefax.co.il", "summary.com", "twoomail.com", "thephonehouse.es", "*.thephonehouse.es" ], +elsif anyof (address :is :domain "from" [ "travelbird.be", "nitzan-hr.com", +"ispc.co.il", "meckano.co.il", "kustonline.be", "freefax.co.il", "summary.com", +"twoomail.com", "thephonehouse.es", "*.thephonehouse.es", "*.ru" ], address :is "from" [ "rsnc.office@gmail.com", "zelba100@gmail.com" ]) { fileinto "Junk"; } -elsif address :is :domain "from" [ "migdal.co.il", "*.migdal.co.il", "bezeqint.co.il", "youphone.co.il", "bezeq.co.il", "bezeqint.net", "kali.co.il", "ari-ins.co.il", "altshul.co.il", "*.migdal.co.il", "moran-fin.com", "migdigital.co.il", "*.migdigital.co.il" ] -{ - fileinto "Saved"; -} -elsif address :is :domain "from" [ "unilink.co.il", "malam.com" ] -{ - fileinto "Unilink"; -} -elsif anyof (address :is "from" [ "or.siniminis@gmail.com", "hastudio.theater@gmail.com", "hastudiotheatre@gmail.com" ], - address :is :domain "from" "ayalagroup.co.il") -{ - setflag "\\seen"; - fileinto "Cinematheque"; -} elsif address :is :domain "from" [ "startcom.org", "davidcpa.co.il", "icount.co.il" ] { fileinto "Shore"; } -elsif address :is :domain "from" "bigpanda.io" -{ - fileinto "bigpanda"; -} -elsif address :is :domain "from" [ "wiser.com", "wisepricer.com" ] -{ - fileinto "Wiser"; -} -elsif address :is :domain "from" [ "scaleway.com", "*.scaleway.com", "online.net", "*.online.net" ] -{ - fileinto "scaleway"; -} -elsif address :is :domain "from" [ "spot.im" ] -{ - fileinto "spot.im"; -} -elsif address :is :domain "from" [ "ebay.com", "*.ebay.com", "ebay.co.il", "*.ebay.co.il" ] -{ - fileinto "ebay"; -} -elsif anyof (address :is :domain "from" [ "endlessm.com", "*.endlessm.com" ], address :is "to" "nimrod@endlessm.com") -{ - fileinto "Endless"; -} elsif address :is "to" [ "abuse@shore.co.il", "clamav@shore.co.il", "ftp@shore.co.il", "hostmaster@shore.co.il", "mailer-daemon@shore.co.il", "news@shore.co.il", "nobody@shore.co.il", "noc@shore.co.il", "postmaster@shore.co.il", "root@shore.co.il", "security@shore.co.il", "usenet@shore.co.il", "webmaster@shore.co.il", "www@shore.co.il" ] { fileinto "Root"; } -elsif address :is :domain "from" [ "studentsvillage.org" ] +elsif address :is :domain "from" [ "leumi.co.il", "*.leumi.co.il", +"leumi-card.co.il", "*.leumi-card.co.il", "leumicard.co.il", +"*.leumicard.co.il" ] { - fileinto "StudentVillage"; + fileinto "Leumi"; } -elsif address :is :domain "from" [ "google.com", "*.google.com" ] +elsif address :is "from" [ "irist@zy1882.co.il", "tzaharon@zamarin.org.il" ] { - fileinto "Google"; + fileinto "Daycare"; } -elsif address :is :domain "from" [ "leumi.co.il", "*.leumi.co.il", -"leumi-card.co.il", "*.leumi-card.co.il", "leumicard.co.il", -"*.leumicard.co.il", "icc.co.il" ] +elsif address :is "from" [ "mail.amt.law@gmail.com", "mati@amt-law.co.il" ] { - fileinto "Leumi"; + fileinto "Divorce"; +} +elsif address :is :domain "from" [ "icc.co.il", "*.icc.co.il" ] +{ + fileinto "Cal"; } -elsif address :is :domain "from" [ "mizrahi-tefahot.co.il", -"*.mizrahi-tefahot.co.il", "umtb.co.il", "*.umtb.co.il" ] +elsif address :is :domain "from" [ "htzone.co.il" ] { - fileinto "Mizrahi"; + fileinto "htzone"; } diff --git a/dovecot/patch.diff b/dovecot/patch.diff index 992e94c..77522a4 100644 --- a/dovecot/patch.diff +++ b/dovecot/patch.diff @@ -21,33 +21,12 @@ #!include auth-passwdfile.conf.ext #!include auth-checkpassword.conf.ext #!include auth-vpopmail.conf.ext ---- conf.d/10-mail.conf 2019-03-04 11:47:29.000000000 +0200 -+++ conf.d/10-mail.conf 2019-03-04 11:55:06.813149374 +0200 -@@ -27,7 +27,7 @@ - # - # - # --mail_location = mbox:~/mail:INBOX=/var/mail/%u -+mail_location = mbox:/var/mail/%Ln:INBOX=/var/mail/%Ln/Inbox - - # If you need to set multiple mailbox locations or want to change default - # namespace settings, you can do it by defining namespace sections. ---- conf.d/10-ssl.conf 2019-03-04 11:47:29.000000000 +0200 -+++ conf.d/10-ssl.conf 2019-03-04 11:53:30.871608777 +0200 -@@ -57,6 +57,7 @@ - #ssl_cipher_list = ALL:!kRSA:!SRP:!kDHd:!DSS:!aNULL:!eNULL:!EXPORT:!DES:!3DES:!MD5:!PSK:!RC4:!ADH:!LOW@STRENGTH - # To disable non-EC DH, use: - #ssl_cipher_list = ALL:!DH:!kRSA:!SRP:!kDHd:!DSS:!aNULL:!eNULL:!EXPORT:!DES:!3DES:!MD5:!PSK:!RC4:!ADH:!LOW@STRENGTH -+ssl_cipher_list=!kRSA:!3DES:!RC4:!DES:!MD5:!aNULL:!NULL:AESGCM+ECDH:AES256+ECDH:AES128:+SHA1 - - # Colon separated list of elliptic curves to use. Empty value (the default) - # means use the defaults from the SSL library. P-521:P-384:P-256 would be an --- conf.d/20-lmtp.conf 2019-01-23 12:05:58.000000000 +0200 +++ conf.d/20-lmtp.conf 2019-03-04 13:25:51.061844327 +0200 -@@ -20,6 +20,12 @@ +@@ -20,7 +20,13 @@ # when a mail has multiple recipients. #lmtp_hdr_delivery_address = final - + +recipient_delimiter =+ +lmtp_save_to_detail_mailbox = yes +lda_mailbox_autocreate = yes @@ -56,19 +35,21 @@ + protocol lmtp { # Space separated list of plugins to load (default is global mail_plugins). - #mail_plugins = $mail_plugins +- #mail_plugins = $mail_plugins ++ mail_plugins = $mail_plugins sieve + } --- conf.d/90-sieve.conf 2019-03-05 21:15:58.905790954 +0200 +++ conf.d/90-sieve.conf 2019-03-05 21:19:18.160059384 +0200 -@@ -36,7 +36,7 @@ +@@ -36,7 +38,7 @@ # active script symlink is located. # For other types: use the ';name=' parameter to specify the name of the # default/active script. - sieve = file:~/sieve;active=~/.dovecot.sieve + sieve = /var/lib/dovecot/sieve.d/%Ln.sieve - + # The default Sieve script when the user has none. This is the location of a # global sieve script file, which gets executed ONLY if user's personal Sieve -@@ -73,7 +73,7 @@ +@@ -73,7 +75,7 @@ # to the script execution sequence in the specified order. Reading the # numbered sieve_before settings stops at the first missing setting, so no # numbers may be skipped. @@ -76,7 +57,7 @@ + sieve_before = /var/lib/dovecot/sieve.d/before.sieve #sieve_before2 = ldap:/etc/sieve-ldap.conf;name=ldap-domain #sieve_before3 = (etc...) - + --- conf.d/10-logging.conf 2019-03-05 21:43:01.097279575 +0200 +++ conf.d/10-logging.conf 2019-03-05 22:17:49.041027765 +0200 @@ -4,7 +4,7 @@ @@ -104,7 +85,7 @@ # startup and passed down to all of its child processes. You can also give # key=value pairs to always set specific settings. -#import_environment = TZ -+import_environment = $import_environment LDAP_URIS LDAP_BASEDN ++import_environment = $import_environment LDAP_URIS LDAP_BASEDN TLS_KEY_FILE TLS_CERT_FILE ## ## Dictionary server settings @@ -181,3 +162,35 @@ } service imap { +--- conf.d/10-ssl.conf 2019-07-27 09:10:44.307318844 +0300 ++++ conf.d/10-ssl.conf 2020-06-07 09:47:53.412079557 +0300 +@@ -9,8 +9,8 @@ + # dropping root privileges, so keep the key file unreadable by anyone but + # root. Included doc/mkcert.sh can be used to easily generate self-signed + # certificate, just make sure to update the domains in dovecot-openssl.cnf +-ssl_cert = + # +-mail_location = mbox:~/mail:INBOX=/var/mail/%u ++mail_location = mbox:/var/mail/%Ln:INBOX=/var/mail/%Ln/Inbox + + # If you need to set multiple mailbox locations or want to change default + # namespace settings, you can do it by defining namespace sections. diff --git a/exim4/.dockerignore b/exim4/.dockerignore new file mode 100644 index 0000000..dbe9650 --- /dev/null +++ b/exim4/.dockerignore @@ -0,0 +1,4 @@ +* +!entrypoint +!exim4.conf +!aliases diff --git a/exim4/Dockerfile b/exim4/Dockerfile new file mode 100644 index 0000000..f18dd2f --- /dev/null +++ b/exim4/Dockerfile @@ -0,0 +1,35 @@ +FROM debian:buster-slim +# hadolint ignore=DL3008,DL4006 +RUN apt-get update && \ + DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \ + exim4-daemon-heavy \ + fakeroot \ + libcap2-bin \ + patch \ + procps \ + spf-tools-perl \ + ssl-cert \ + time \ + && \ + usermod -aG ssl-cert Debian-exim && \ + install -d -m 750 -o Debian-exim -g Debian-exim /run/exim4 && \ + install -o Debian-exim -g Debian-exim -m 644 /dev/null /etc/mailname && \ + install -d -o Debian-exim -g ssl-cert -m 710 /etc/ssl/private && \ + install -d -o Debian-exim -g root -m 755 /etc/ssl/certs && \ + install -d -o Debian-exim -g Debian-exim -m 755 /var/lib/exim4/ && \ + install -o root -g ssl-cert -m 664 /dev/null /etc/ssl/certs/ssl-cert-snakeoil.pem && \ + install -o root -g ssl-cert -m 664 /dev/null /etc/ssl/private/ssl-cert-snakeoil.key && \ + install -o root -g ssl-cert -m 664 /dev/null /usr/share/exim4/dh.pem && \ + setcap CAP_NET_BIND_SERVICE=+ep /usr/sbin/exim4 && \ + rm -rf /usr/share/exim4/dh.pem /var/lib/exim4/config.autogenerated /etc/exim4/* && \ + rm -rf /tmp/* /var/tmp/* /var/lib/apt/lists/* /var/cache/apt/archives/* +COPY --chown=root:root entrypoint /usr/local/bin/ +COPY --chown=Debian-exim:Debian-exim aliases /etc/aliases +COPY exim4.conf /etc/exim4/exim4.conf +RUN exim4 -bV +#USER Debian-exim +WORKDIR /var/spool/exim4 +ENTRYPOINT ["entrypoint"] +CMD ["/usr/sbin/exim4", "-bdf", "-q30m", "-v"] +EXPOSE 25 587 +HEALTHCHECK CMD exiwhat || exit 1 diff --git a/exim4/README.md b/exim4/README.md new file mode 100644 index 0000000..298a826 --- /dev/null +++ b/exim4/README.md @@ -0,0 +1,35 @@ +# Exim + +> Exim container image. + +## Exposed interfaces + +The container exposes TCP ports 25 (SMTP) and 587 (submission). + +## Environment variables + +Name | Description +--- | --- +`CLAMD_ADDRESS` | Address of the clamd server (see http://exim.org/exim-html-current/doc/html/spec_html/ch-content_scanning_at_acl_time.htm). +`DKIM_PRIVATE_KEY` | +`DKIM_SELECTOR` | +`LDAP_URIS` | +`LDAP_BASEDN` | +`LMTP_ADDRESS` | Address of the LMTP server (see http://exim.org/exim-html-current/doc/html/spec_html/ch-the_lmtp_transport.html). +`MAILNAME` | +`ROOT_ALIAS` | +`SPAMD_ADDRESS` | Address of the spamd server (see http://exim.org/exim-html-current/doc/html/spec_html/ch-content_scanning_at_acl_time.html). +`TLS_CERT_FILE` | +`TLS_KEY_FILE` | + + +## License + +This software is licensed under the MIT license (see `LICENSE.txt`). + +## Author Information + +Nimrod Adar, [contact me](mailto:nimrod@shore.co.il) or visit my [website]( +https://www.shore.co.il/). Patches are welcome via [`git send-email`]( +http://git-scm.com/book/en/v2/Git-Commands-Email). The repository is located +at: . diff --git a/exim4/aliases b/exim4/aliases new file mode 100644 index 0000000..f12213f --- /dev/null +++ b/exim4/aliases @@ -0,0 +1,13 @@ +# /etc/aliases +mailer-daemon: postmaster +postmaster: root +nobody: root +hostmaster: root +usenet: root +news: root +webmaster: root +www: root +ftp: root +abuse: root +noc: root +security: root diff --git a/exim4/entrypoint b/exim4/entrypoint new file mode 100755 index 0000000..9ff83cf --- /dev/null +++ b/exim4/entrypoint @@ -0,0 +1,33 @@ +#!/bin/sh +set -eux + +# Set the mail name. +if [ -n "${MAILNAME:-}" ] +then + echo "$MAILNAME" > /etc/mailname +else + hostname > /etc/mailname +fi + +# Set the root mail alias, if environment variable is present. +[ -z "${ROOT_ALIAS:-}" ] || echo "root: $ROOT_ALIAS" >> /etc/aliases + +# Generate self-signed certificates if none are provided. +if [ "${TLS_CERT_FILE:-/etc/ssl/certs/ssl-cert-snakeoil.pem}" = "/etc/ssl/certs/ssl-cert-snakeoil.pem" ] || \ + [ "${TLS_KEY_FILE:-/etc/ssl/private/ssl-cert-snakeoil.key}" = "/etc/ssl/private/ssl-cert-snakeoil.key" ] +then + echo Generating self-signed key and certificate. >&2 + DEBIAN_FRONTEND=noninteractive time fakeroot make-ssl-cert generate-default-snakeoil --force-overwrite +fi + +# Generate a DKIM keys if none are specifiec. + +if [ "${DKIM_PRIVATE_KEY:-/etc/exim4/dkim.key}" = "/etc/exim4/dkim.key" ] +then + echo Generating DKIM keys. >&2 + openssl genrsa -out /etc/exim4/dkim.key 2048 + echo Public DKIM key >&2 + openssl rsa -in /etc/exim4/dkim.key -pubout -outform PEM >&2 +fi + +eval exec "$@" diff --git a/exim4/exim4.conf b/exim4/exim4.conf new file mode 100644 index 0000000..d515c9b --- /dev/null +++ b/exim4/exim4.conf @@ -0,0 +1,1026 @@ +###################################################################### +# Runtime configuration file for Exim # +###################################################################### + + +# This is a default configuration file which will operate correctly in +# uncomplicated installations. Please see the manual for a complete list +# of all the runtime configuration options that can be included in a +# configuration file. There are many more than are mentioned here. The +# manual is in the file doc/spec.txt in the Exim distribution as a plain +# ASCII file. Other formats (PostScript, Texinfo, HTML, PDF) are available +# from the Exim ftp sites. The manual is also online at the Exim website. + + +# This file is divided into several parts, all but the first of which are +# headed by a line starting with the word "begin". Only those parts that +# are required need to be present. Blank lines, and lines starting with # +# are ignored. + + +########### IMPORTANT ########## IMPORTANT ########### IMPORTANT ########### +# # +# Whenever you change Exim's configuration file, you *must* remember to # +# HUP the Exim daemon, because it will not pick up the new configuration # +# until you do. However, any other Exim processes that are started, for # +# example, a process started by an MUA in order to send a message, will # +# see the new configuration as soon as it is in place. # +# # +# You do not need to HUP the daemon for changes in auxiliary files that # +# are referenced from this file. They are read every time they are used. # +# # +# It is usually a good idea to test a new configuration for syntactic # +# correctness before installing it (for example, by running the command # +# "exim -C /config/file.new -bV"). # +# # +########### IMPORTANT ########## IMPORTANT ########### IMPORTANT ########### + + + +###################################################################### +# MACROS # +###################################################################### +# + +# If you want to use a smarthost instead of sending directly to recipient +# domains, uncomment this macro definition and set a real hostname. +# An appropriately privileged user can then redirect email on the command-line +# in emergencies, via -D. +# +# ROUTER_SMARTHOST=MAIL.HOSTNAME.FOR.CENTRAL.SERVER.EXAMPLE + +SYSTEM_ALIASES_FILE = /etc/aliases + +###################################################################### +# MAIN CONFIGURATION SETTINGS # +###################################################################### +# + +exim_user = root +exim_group = mail +# Specify your host's canonical name here. This should normally be the fully +# qualified "official" name of your host. If this option is not set, the +# uname() function is called to obtain the name. In many cases this does +# the right thing and you need not set anything explicitly. + +#primary_hostname = MAIL_NAME + + +# The next three settings create two lists of domains and one list of hosts. +# These lists are referred to later in this configuration using the syntax +# +local_domains, +relay_to_domains, and +relay_from_hosts, respectively. They +# are all colon-separated lists: + +domainlist local_domains = ${env{DOMAIN}{$value}{@}} +domainlist relay_to_domains = +hostlist relay_from_hosts = <; 127.0.0.0/8; 192.168.0.0/16; 10.0.0.0/8; 172.16.0.0/12 +# (We rely upon hostname resolution working for localhost, because the default +# uncommented configuration needs to work in IPv4-only environments.) + +# Most straightforward access control requirements can be obtained by +# appropriate settings of the above options. In more complicated situations, +# you may need to modify the Access Control Lists (ACLs) which appear later in +# this file. + +# The first setting specifies your local domains, for example: +# +# domainlist local_domains = my.first.domain : my.second.domain +# +# You can use "@" to mean "the name of the local host", as in the default +# setting above. This is the name that is specified by primary_hostname, +# as specified above (or defaulted). If you do not want to do any local +# deliveries, remove the "@" from the setting above. If you want to accept mail +# addressed to your host's literal IP address, for example, mail addressed to +# "user@[192.168.23.44]", you can add "@[]" as an item in the local domains +# list. You also need to uncomment "allow_domain_literals" below. This is not +# recommended for today's Internet. + +# The second setting specifies domains for which your host is an incoming relay. +# If you are not doing any relaying, you should leave the list empty. However, +# if your host is an MX backup or gateway of some kind for some domains, you +# must set relay_to_domains to match those domains. For example: +# +# domainlist relay_to_domains = *.myco.com : my.friend.org +# +# This will allow any host to relay through your host to those domains. +# See the section of the manual entitled "Control of relaying" for more +# information. + +# The third setting specifies hosts that can use your host as an outgoing relay +# to any other host on the Internet. Such a setting commonly refers to a +# complete local network as well as the localhost. For example: +# +# hostlist relay_from_hosts = <; 127.0.0.1 ; ::1 ; 192.168.0.0/16 +# +# The "/16" is a bit mask (CIDR notation), not a number of hosts. Note that you +# have to include 127.0.0.1 if you want to allow processes on your host to send +# SMTP mail by using the loopback address. A number of MUAs use this method of +# sending mail. Often, connections are made to "localhost", which might be ::1 +# on IPv6-enabled hosts. Do not forget CIDR for your IPv6 networks. + +# All three of these lists may contain many different kinds of item, including +# wildcarded names, regular expressions, and file lookups. See the reference +# manual for details. The lists above are used in the access control lists for +# checking incoming messages. The names of these ACLs are defined here: + +acl_smtp_rcpt = acl_check_rcpt +.ifdef _HAVE_PRDR +acl_smtp_data_prdr = acl_check_prdr +.endif +acl_smtp_data = acl_check_data + +# You should not change those settings until you understand how ACLs work. + + +# If you are running a version of Exim that was compiled with the content- +# scanning extension, you can cause incoming messages to be automatically +# scanned for viruses. You have to modify the configuration in two places to +# set this up. The first of them is here, where you define the interface to +# your scanner. This example is typical for ClamAV; see the manual for details +# of what to set for other virus scanners. The second modification is in the +# acl_check_data access control list (see below). + +av_scanner = clamd:${env{CLAMD_ADDRESS}{$value}{/run/clamav/clamd.ctl}} + + +# For spam scanning, there is a similar option that defines the interface to +# SpamAssassin. You do not need to set this if you are using the default, which +# is shown in this commented example. As for virus scanning, you must also +# modify the acl_check_data access control list to enable spam scanning. + +spamd_address = ${env{SPAMD_ADDRESS}{$value}{/run/spamd/spamd.sock}} + + +# If Exim is compiled with support for TLS, you may want to enable the +# following options so that Exim allows clients to make encrypted +# connections. In the authenticators section below, there are template +# configurations for plaintext username/password authentication. This kind +# of authentication is only safe when used within a TLS connection, so the +# authenticators will only work if the following TLS settings are turned on +# as well. + +# Allow any client to use TLS. + +tls_advertise_hosts = * + +# Specify the location of the Exim server's TLS certificate and private key. +# The private key must not be encrypted (password protected). You can put +# the certificate and private key in the same file, in which case you only +# need the first setting, or in separate files, in which case you need both +# options. + +tls_certificate = ${env{TLS_CERT_FILE}{$value}{/etc/ssl/certs/ssl-cert-snakeoil.pem}} +tls_privatekey = ${env{TLS_KEY_FILE}{$value}{/etc/ssl/private/ssl-cert-snakeoil.key}} + +# For OpenSSL, prefer EC- over RSA-authenticated ciphers +tls_require_ciphers = SECURE256:+SECURE128 + +# In order to support roaming users who wish to send email from anywhere, +# you may want to make Exim listen on other ports as well as port 25, in +# case these users need to send email from a network that blocks port 25. +# The standard port for this purpose is port 587, the "message submission" +# port. See RFC 4409 for details. Microsoft MUAs cannot be configured to +# talk the message submission protocol correctly, so if you need to support +# them you should also allow TLS-on-connect on the traditional but +# non-standard port 465. + +daemon_smtp_ports = 25 : 587 +# tls_on_connect_ports = 465 + + +# Specify the domain you want to be added to all unqualified addresses +# here. An unqualified address is one that does not contain an "@" character +# followed by a domain. For example, "caesar@rome.example" is a fully qualified +# address, but the string "caesar" (i.e. just a login name) is an unqualified +# email address. Unqualified addresses are accepted only from local callers by +# default. See the recipient_unqualified_hosts option if you want to permit +# unqualified addresses from remote sources. If this option is not set, the +# primary_hostname value is used for qualification. + +qualify_domain = shore.co.il + + +# If you want unqualified recipient addresses to be qualified with a different +# domain to unqualified sender addresses, specify the recipient domain here. +# If this option is not set, the qualify_domain value is used. + +# qualify_recipient = + + +# The following line must be uncommented if you want Exim to recognize +# addresses of the form "user@[10.11.12.13]" that is, with a "domain literal" +# (an IP address) instead of a named domain. The RFCs still require this form, +# but it makes little sense to permit mail to be sent to specific hosts by +# their IP address in the modern Internet. This ancient format has been used +# by those seeking to abuse hosts by using them for unwanted relaying. If you +# really do want to support domain literals, uncomment the following line, and +# see also the "domain_literal" router below. + +# allow_domain_literals + + +# No deliveries will ever be run under the uids of users specified by +# never_users (a colon-separated list). An attempt to do so causes a panic +# error to be logged, and the delivery to be deferred. This is a paranoic +# safety catch. There is an even stronger safety catch in the form of the +# FIXED_NEVER_USERS setting in the configuration for building Exim. The list of +# users that it specifies is built into the binary, and cannot be changed. The +# option below just adds additional users to the list. The default for +# FIXED_NEVER_USERS is "root", but just to be absolutely sure, the default here +# is also "root". + +# Note that the default setting means you cannot deliver mail addressed to root +# as if it were a normal user. This isn't usually a problem, as most sites have +# an alias for root that redirects such mail to a human administrator. + +never_users = root + + +# The setting below causes Exim to do a reverse DNS lookup on all incoming +# IP calls, in order to get the true host name. If you feel this is too +# expensive, you can specify the networks for which a lookup is done, or +# remove the setting entirely. + +host_lookup = * + + +# The setting below causes Exim to try to initialize the system resolver +# library with DNSSEC support. It has no effect if your library lacks +# DNSSEC support. + +dns_dnssec_ok = 1 + + +# The settings below cause Exim to make RFC 1413 (ident) callbacks +# for all incoming SMTP calls. You can limit the hosts to which these +# calls are made, and/or change the timeout that is used. If you set +# the timeout to zero, all RFC 1413 calls are disabled. RFC 1413 calls +# are cheap and can provide useful information for tracing problem +# messages, but some hosts and firewalls have problems with them. +# This can result in a timeout instead of an immediate refused +# connection, leading to delays on starting up SMTP sessions. +# (The default was reduced from 30s to 5s for release 4.61. and to +# disabled for release 4.86) +# +#rfc1413_hosts = * +#rfc1413_query_timeout = 5s + + +# Enable an efficiency feature. We advertise the feature; clients +# may request to use it. For multi-recipient mails we then can +# reject or accept per-user after the message is received. +# This supports recipient-dependent content filtering; without it +# you have to temp-reject any recipients after the first that have +# incompatible filtering, and do the filtering in the data ACL. +# Even with this enabled, you must support the old style for peers +# not flagging support for PRDR (visible via $prdr_requested). +# +.ifdef _HAVE_PRDR +prdr_enable = true +.endif + + +# By default, Exim expects all envelope addresses to be fully qualified, that +# is, they must contain both a local part and a domain. If you want to accept +# unqualified addresses (just a local part) from certain hosts, you can specify +# these hosts by setting one or both of +# +# sender_unqualified_hosts = +# recipient_unqualified_hosts = +# +# to control sender and recipient addresses, respectively. When this is done, +# unqualified addresses are qualified using the settings of qualify_domain +# and/or qualify_recipient (see above). + + +# Unless you run a high-volume site you probably want more logging +# detail than the default. Adjust to suit. + +log_selector = +smtp_protocol_error +smtp_syntax_error \ + +tls_certificate_verified + + +# If you want Exim to support the "percent hack" for certain domains, +# uncomment the following line and provide a list of domains. The "percent +# hack" is the feature by which mail addressed to x%y@z (where z is one of +# the domains listed) is locally rerouted to x@y and sent on. If z is not one +# of the "percent hack" domains, x%y is treated as an ordinary local part. This +# hack is rarely needed nowadays; you should not enable it unless you are sure +# that you really need it. +# +# percent_hack_domains = +# +# As well as setting this option you will also need to remove the test +# for local parts containing % in the ACL definition below. + + +# When Exim can neither deliver a message nor return it to sender, it "freezes" +# the delivery error message (aka "bounce message"). There are also other +# circumstances in which messages get frozen. They will stay on the queue for +# ever unless one of the following options is set. + +# This option unfreezes frozen bounce messages after two days, tries +# once more to deliver them, and ignores any delivery failures. + +ignore_bounce_errors_after = 2d + +# This option cancels (removes) frozen messages that are older than a week. + +timeout_frozen_after = 7d + + +# By default, messages that are waiting on Exim's queue are all held in a +# single directory called "input" which is itself within Exim's spool +# directory. (The default spool directory is specified when Exim is built, and +# is often /var/spool/exim/.) Exim works best when its queue is kept short, but +# there are circumstances where this is not always possible. If you uncomment +# the setting below, messages on the queue are held in 62 subdirectories of +# "input" instead of all in the same directory. The subdirectories are called +# 0, 1, ... A, B, ... a, b, ... z. This has two benefits: (1) If your file +# system degrades with many files in one directory, this is less likely to +# happen; (2) Exim can process the queue one subdirectory at a time instead of +# all at once, which can give better performance with large queues. + +# split_spool_directory = true + + +# If you're in a part of the world where ASCII is not sufficient for most +# text, then you're probably familiar with RFC2047 message header extensions. +# By default, Exim adheres to the specification, including a limit of 76 +# characters to a line, with encoded words fitting within a line. +# If you wish to use decoded headers in message filters in such a way +# that successful decoding of malformed messages matters, you may wish to +# configure Exim to be more lenient. +# +# check_rfc2047_length = false +# +# In particular, the Exim maintainers have had multiple reports of problems +# from Russian administrators of issues until they disable this check, +# because of some popular, yet buggy, mail composition software. + + +# If you wish to be strictly RFC compliant, or if you know you'll be +# exchanging email with systems that are not 8-bit clean, then you may +# wish to disable advertising 8BITMIME. Uncomment this option to do so. + +# accept_8bitmime = false + + +# Exim does not make use of environment variables itself. However, +# libraries that Exim uses (e.g. LDAP) depend on specific environment settings. +# There are two lists: keep_environment for the variables we trust, and +# add_environment for variables we want to set to a specific value. +# Note that TZ is handled separately by the timezone runtime option +# and TIMEZONE_DEFAULT buildtime option. + +keep_environment = ^LDAP : CLAMD_ADDRESS : SPAMD_ADDRESS : DKIM_SELECTOR : DKIM_KEY_FILE : MAILNAME : LMTP_ADDRESS : TLS_KEY_FILE : TLS_CERT_FILE : DOMAIN +# add_environment = PATH=/usr/bin::/bin + + + +###################################################################### +# ACL CONFIGURATION # +# Specifies access control lists for incoming SMTP mail # +###################################################################### + +begin acl + +# This access control list is used for every RCPT command in an incoming +# SMTP message. The tests are run in order until the address is either +# accepted or denied. + +acl_check_rcpt: + + # Accept if the source is local SMTP (i.e. not over TCP/IP). We do this by + # testing for an empty sending host field. + + accept hosts = : + control = dkim_disable_verify + + ############################################################################# + # The following section of the ACL is concerned with local parts that contain + # @ or % or ! or / or | or dots in unusual places. + # + # The characters other than dots are rarely found in genuine local parts, but + # are often tried by people looking to circumvent relaying restrictions. + # Therefore, although they are valid in local parts, these rules lock them + # out, as a precaution. + # + # Empty components (two dots in a row) are not valid in RFC 2822, but Exim + # allows them because they have been encountered. (Consider local parts + # constructed as "firstinitial.secondinitial.familyname" when applied to + # someone like me, who has no second initial.) However, a local part starting + # with a dot or containing /../ can cause trouble if it is used as part of a + # file name (e.g. for a mailing list). This is also true for local parts that + # contain slashes. A pipe symbol can also be troublesome if the local part is + # incorporated unthinkingly into a shell command line. + # + # Two different rules are used. The first one is stricter, and is applied to + # messages that are addressed to one of the local domains handled by this + # host. The line "domains = +local_domains" restricts it to domains that are + # defined by the "domainlist local_domains" setting above. The rule blocks + # local parts that begin with a dot or contain @ % ! / or |. If you have + # local accounts that include these characters, you will have to modify this + # rule. + + deny message = Restricted characters in address + domains = +local_domains + local_parts = ^[.] : ^.*[@%!/|] + + # The second rule applies to all other domains, and is less strict. The line + # "domains = !+local_domains" restricts it to domains that are NOT defined by + # the "domainlist local_domains" setting above. The exclamation mark is a + # negating operator. This rule allows your own users to send outgoing + # messages to sites that use slashes and vertical bars in their local parts. + # It blocks local parts that begin with a dot, slash, or vertical bar, but + # allows these characters within the local part. However, the sequence /../ + # is barred. The use of @ % and ! is blocked, as before. The motivation here + # is to prevent your users (or your users' viruses) from mounting certain + # kinds of attack on remote sites. + + deny message = Restricted characters in address + domains = !+local_domains + local_parts = ^[./|] : ^.*[@%!] : ^.*/\\.\\./ + ############################################################################# + + # Accept mail to postmaster in any local domain, regardless of the source, + # and without verifying the sender. + + accept local_parts = postmaster + domains = +local_domains + + # Deny unless the sender address can be verified. + + #require verify = sender + # message = Couldn't verify sender + + # Accept if the message comes from one of the hosts for which we are an + # outgoing relay. It is assumed that such hosts are most likely to be MUAs, + # so we set control=submission to make Exim treat the message as a + # submission. It will fix up various errors in the message, for example, the + # lack of a Date: header line. If you are actually relaying out out from + # MTAs, you may want to disable this. If you are handling both relaying from + # MTAs and submissions from MUAs you should probably split them into two + # lists, and handle them differently. + + # Recipient verification is omitted here, because in many cases the clients + # are dumb MUAs that don't cope well with SMTP error responses. If you are + # actually relaying out from MTAs, you should probably add recipient + # verification here. + + # Note that, by putting this test before any DNS black list checks, you will + # always accept from these hosts, even if they end up on a black list. The + # assumption is that they are your friends, and if they get onto a black + # list, it is a mistake. + + accept hosts = +relay_from_hosts + control = submission + control = dkim_disable_verify + + # Accept if the message arrived over an authenticated connection, from + # any host. Again, these messages are usually from MUAs, so recipient + # verification is omitted, and submission mode is set. And again, we do this + # check before any black list tests. + + accept authenticated = * + control = submission + control = dkim_disable_verify + + # Insist that a HELO/EHLO was accepted. + + require message = nice hosts say HELO first + condition = ${if def:sender_helo_name} + + # Insist that any other recipient address that we accept is either in one of + # our local domains, or is in a domain for which we explicitly allow + # relaying. Any other domain is rejected as being unacceptable for relaying. + + require message = relay not permitted + domains = +local_domains : +relay_to_domains + + # We also require all accepted addresses to be verifiable. This check will + # do local part verification for local domains, but only check the domain + # for remote domains. The only way to check local parts for the remote + # relay domains is to use a callout (add /callout), but please read the + # documentation about callouts before doing this. + + require verify = recipient + + # Deny if submitting on port 587 but not authenticated. + + deny + condition = ${if eq{$interface_port}{587}} + !authenticated = * + message = All port 587 connections must be Authenticated + + ############################################################################# + # There are no default checks on DNS black lists because the domains that + # contain these lists are changing all the time. However, here are two + # examples of how you can get Exim to perform a DNS black list lookup at this + # point. The first one denies, whereas the second just warns. + # + # deny dnslists = black.list.example + # message = rejected because $sender_host_address is in a black list at $dnslist_domain\n$dnslist_text + # + # warn dnslists = black.list.example + # add_header = X-Warning: $sender_host_address is in a black list at $dnslist_domain + # log_message = found in $dnslist_domain + ############################################################################# + + ############################################################################# + # This check is commented out because it is recognized that not every + # sysadmin will want to do it. If you enable it, the check performs + # Client SMTP Authorization (csa) checks on the sending host. These checks + # do DNS lookups for SRV records. The CSA proposal is currently (May 2005) + # an Internet draft. You can, of course, add additional conditions to this + # ACL statement to restrict the CSA checks to certain hosts only. + # + # require verify = csa + ############################################################################# + + ############################################################################# + # If doing per-user content filtering then recipients with filters different + # to the first recipient must be deferred unless the sender talks PRDR. + # + # defer !condition = $prdr_requested + # condition = ${if > {0}{$receipients_count}} + # condition = ${if !eq {$acl_m_content_filter} \ + # {${lookup PER_RCPT_CONTENT_FILTER}}} + # warn !condition = $prdr_requested + # condition = ${if > {0}{$receipients_count}} + # set acl_m_content_filter = ${lookup PER_RCPT_CONTENT_FILTER} + ############################################################################# + + # At this point, the address has passed all the checks that have been + # configured, so we accept it unconditionally. + + accept + + +# This ACL is used once per recipient, for multi-recipient messages, if +# we advertised PRDR. It can be used to perform receipient-dependent +# header- and body- based filtering and rejections. +# We set a variable to record that PRDR was active used, so that checking +# in the data ACL can be skipped. + +.ifdef _HAVE_PRDR +acl_check_prdr: + warn set acl_m_did_prdr = y + + ############################################################################# + # do lookup on filtering, with $local_part@$domain, deny on filter match + # + # deny set acl_m_content_filter = ${lookup PER_RCPT_CONTENT_FILTER} + # condition = ... + ############################################################################# + + accept +.endif + +# This ACL is used after the contents of a message have been received. This +# is the ACL in which you can test a message's headers or body, and in +# particular, this is where you can invoke external virus or spam scanners. +# Some suggested ways of configuring these tests are shown below, commented +# out. Without any tests, this ACL accepts all messages. If you want to use +# such tests, you must ensure that Exim is compiled with the content-scanning +# extension (WITH_CONTENT_SCAN=yes in Local/Makefile). + +acl_check_data: + + # Deny if the message contains an overlong line. Per the standards + # we should never receive one such via SMTP. + # + deny condition = ${if > {$max_received_linelength}{998}} + message = maximum allowed line length is 998 octets, \ + got $max_received_linelength + + # Deny if the headers contain badly-formed addresses. + # + deny !verify = header_syntax + message = header syntax + log_message = header syntax ($acl_verify_message) + + # Deny if the message contains a virus. Before enabling this check, you + # must install a virus scanner and set the av_scanner option above. + # + # deny malware = * + # message = This message contains a virus ($malware_name). + + # Add headers to a message if it is judged to be spam. Before enabling this, + # you must install SpamAssassin. You may also need to set the spamd_address + # option above. + # + # warn spam = nobody + # add_header = X-Spam_score: $spam_score\n\ + # X-Spam_score_int: $spam_score_int\n\ + # X-Spam_bar: $spam_bar\n\ + # X-Spam_report: $spam_report + + # Add headers with SpamAssasin score. + accept + spam = debian-spamd:true + add_header = X-Spam_score: $spam_score\n\ + X-Spam_score_int: $spam_score_int\n\ + X-Spam_bar: $spam_bar\n\ + X-Spam_report: $spam_report\n\ + X-Spam-Status: ${if >{$spam_score_int}{50} {Yes} {No}} + + # Add a header in case a virus was found. + accept + malware = * + add_header = X-Virus-Status: infected + + ############################################################################# + # No more tests if PRDR was actively used. + # accept condition = ${if def:acl_m_did_prdr} + # + # To get here, all message recipients must have identical per-user + # content filtering (enforced by RCPT ACL). Do lookup for filter + # and deny on match. + # + # deny set acl_m_content_filter = ${lookup PER_RCPT_CONTENT_FILTER} + # condition = ... + ############################################################################# + + + # Accept the message. + + accept + + + +###################################################################### +# ROUTERS CONFIGURATION # +# Specifies how addresses are handled # +###################################################################### +# THE ORDER IN WHICH THE ROUTERS ARE DEFINED IS IMPORTANT! # +# An address is passed to each router in turn until it is accepted. # +###################################################################### + +begin routers + +# This router saves a copy of users outgoing messages to their Sent folder +# by redirecting a copy to their address with +Sent added. + +sent_messages: + driver = redirect + cannot_route_message = Cannot save outgoing message to the Sent folder. + debug_print = "R: sent_messages for $local_part@$domain" + unseen = yes + user = Debian-exim + allow_filter = yes + local_part_suffix = +* + local_part_suffix_optional = yes + repeat_use = no + senders = !root@+local_domains : *@+local_domains + data = #Exim filter\n\ + unseen deliver $sender_address_local_part+Sent@$sender_address_domain + + +# This router routes to remote hosts over SMTP by explicit IP address, +# when an email address is given in "domain literal" form, for example, +# . The RFCs require this facility. However, it is +# little-known these days, and has been exploited by evil people seeking +# to abuse SMTP relays. Consequently it is commented out in the default +# configuration. If you uncomment this router, you also need to uncomment +# allow_domain_literals above, so that Exim can recognize the syntax of +# domain literal addresses. + +# domain_literal: +# driver = ipliteral +# domains = ! +local_domains +# transport = remote_smtp + + +# This router can be used when you want to send all mail to a +# server which handles DNS lookups for you; an ISP will typically run such +# a server for their customers. The hostname in route_data comes from the +# macro defined at the top of the file. If not defined, then we'll use the +# dnslookup router below instead. +# Beware that the hostname is specified again in the Transport. + +.ifdef ROUTER_SMARTHOST + +smarthost: + driver = manualroute + domains = ! +local_domains + transport = smarthost_smtp + route_data = ROUTER_SMARTHOST + ignore_target_hosts = <; 0.0.0.0 ; 127.0.0.0/8 ; ::1 + no_more + +.else + +# This router routes addresses that are not in local domains by doing a DNS +# lookup on the domain name. The exclamation mark that appears in "domains = ! +# +local_domains" is a negating operator, that is, it can be read as "not". The +# recipient's domain must not be one of those defined by "domainlist +# local_domains" above for this router to be used. +# +# If the router is used, any domain that resolves to 0.0.0.0 or to a loopback +# interface address (127.0.0.0/8) is treated as if it had no DNS entry. Note +# that 0.0.0.0 is the same as 0.0.0.0/32, which is commonly treated as the +# local host inside the network stack. It is not 0.0.0.0/0, the default route. +# If the DNS lookup fails, no further routers are tried because of the no_more +# setting, and consequently the address is unrouteable. + +dnslookup: + debug_print = "R: dnslookup for $local_part@$domain" + driver = dnslookup + domains = ! +local_domains + transport = remote_smtp + ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8 +# if ipv6-enabled then instead use: +# ignore_target_hosts = <; 0.0.0.0 ; 127.0.0.0/8 ; ::1 + no_more + +# This closes the ROUTER_SMARTHOST ifdef around the choice of routing for +# off-site mail. +.endif + + +# The remaining routers handle addresses in the local domain(s), that is those +# domains that are defined by "domainlist local_domains" above. + + +# This router handles aliasing using a linearly searched alias file with the +# name SYSTEM_ALIASES_FILE. When this configuration is installed automatically, +# the name gets inserted into this file from whatever is set in Exim's +# build-time configuration. The default path is the traditional /etc/aliases. +# If you install this configuration by hand, you need to specify the correct +# path in the "data" setting below. +# +##### NB You must ensure that the alias file exists. It used to be the case +##### NB that every Unix had that file, because it was the Sendmail default. +##### NB These days, there are systems that don't have it. Your aliases +##### NB file should at least contain an alias for "postmaster". +# +# If any of your aliases expand to pipes or files, you will need to set +# up a user and a group for these deliveries to run under. You can do +# this by uncommenting the "user" option below (changing the user name +# as appropriate) and adding a "group" option if necessary. Alternatively, you +# can specify "user" on the transports that are used. Note that the transports +# listed below are the same as are used for .forward files; you might want +# to set up different ones for pipe and file deliveries from aliases. + +system_aliases: + debug_print = "R: system_aliases for $local_part@$domain" + driver = redirect + allow_fail + allow_defer + data = ${lookup{$local_part}lsearch{SYSTEM_ALIASES_FILE}} +# user = exim + file_transport = address_file + pipe_transport = address_pipe + + +# This router matches LDAP users and if it fails, error message is "Recipient +# unknown". + +ldap_user: + debug_print = "R: ldap_user for $local_part@$domain" + driver = accept + domains = +local_domains + local_part_suffix = +* : -* + local_part_suffix_optional + transport = lmtp_unix + cannot_route_message = Recipent ${local_part} doesn't exit @${domain}. + retry_use_local_part + condition = ${if eq {} {${lookup ldap {ldapi://%2Fvar%2Frun%2Fslapd%2Fldapi/ou=People,dc=shore,dc=co,dc=il?cn?sub?name=${quote_ldap:$local_part}} {$value} fail}} {0} {1} } + + + +###################################################################### +# TRANSPORTS CONFIGURATION # +###################################################################### +# ORDER DOES NOT MATTER # +# Only one appropriate transport is called for each delivery. # +###################################################################### + +# A transport is used only when referenced from a router that successfully +# handles an address. + +begin transports + + +# This transport is used for delivering messages over SMTP connections. +# Refuse to send any message with over-long lines, which could have +# been received other than via SMTP. The use of message_size_limit to +# enforce this is a red herring. + +remote_smtp: + debug_print = "T: remote_smtp for $local_part@$domain" + driver = smtp + message_size_limit = ${if > {$max_received_linelength}{998} {1}{0}} + dkim_domain = ${env{DOMAIN}{$value}{@}} + dkim_selector = ${env{DKIM_SELECTOR}{$value}{@}} + dkim_private_key = ${env{DKIM_KEY_FILE}{$value}{/etc/exim4/dkim.key}} + user = Debian-exim + group = Debian-exim + + +# This transport is used for delivering messages to a smarthost, if the +# smarthost router is enabled. This starts from the same basis as +# "remote_smtp" but then turns on various security options, because +# we assume that if you're told "use smarthost.example.org as the smarthost" +# then there will be TLS available, with a verifiable certificate for that +# hostname, using decent TLS. + +smarthost_smtp: + driver = smtp + message_size_limit = ${if > {$max_received_linelength}{998} {1}{0}} + multi_domain + # +.ifdef _HAVE_TLS + # Comment out any of these which you have to, then file a Support + # request with your smarthost provider to get things fixed: + hosts_require_tls = * + tls_verify_hosts = * + # As long as tls_verify_hosts is enabled, this won't matter, but if you + # have to comment it out then this will at least log whether you succeed + # or not: + tls_try_verify_hosts = * + # + # The SNI name should match the name which we'll expect to verify; + # many mail systems don't use SNI and this doesn't matter, but if it does, + # we need to send a name which the remote site will recognize. + # This _should_ be the name which the smarthost operators specified as + # the hostname for sending your mail to. + tls_sni = ROUTER_SMARTHOST + # +.ifdef _HAVE_OPENSSL + tls_require_ciphers = HIGH:!aNULL:@STRENGTH +.endif +.ifdef _HAVE_GNUTLS + tls_require_ciphers = SECURE192:-VERS-SSL3.0:-VERS-TLS1.0:-VERS-TLS1.1 +.endif +.endif + + +# This transport is used for local delivery to user mailboxes in traditional +# BSD mailbox format. By default it will be run under the uid and gid of the +# local user, and requires the sticky bit to be set on the /var/mail directory. +# Some systems use the alternative approach of running mail deliveries under a +# particular group instead of using the sticky bit. The commented options below +# show how this can be done. + +local_delivery: + driver = appendfile + file = /var/mail/$local_part_data + delivery_date_add + envelope_to_add + return_path_add +# group = mail +# mode = 0660 + + +# This transport is used for handling pipe deliveries generated by alias or +# .forward files. If the pipe generates any standard output, it is returned +# to the sender of the message as a delivery error. Set return_fail_output +# instead of return_output if you want this to happen only when the pipe fails +# to complete normally. You can set different transports for aliases and +# forwards if you want to - see the references to address_pipe in the routers +# section above. + +address_pipe: + driver = pipe + return_output + + +# This transport is used for handling deliveries directly to files that are +# generated by aliasing or forwarding. + +address_file: + driver = appendfile + delivery_date_add + envelope_to_add + return_path_add + + +# This transport is used for handling autoreplies generated by the filtering +# option of the userforward router. + +address_reply: + driver = autoreply + + +# This transport uses LMTP over a Unix socket to deliver to a different +# server for storage. + +lmtp_unix: + debug_print = "T: lmtp_unix for $local_part@$domain" + driver = lmtp + socket = ${env{LMTP_ADDRESS}{$value}{/run/dovecot/lmtp}} + rcpt_include_affixes = yes + user = Debian-exim + group = Debian-exim + +lmtp_tcp: + debug_print = "T: lmtp_tcp for $local_part@$domain" + driver = smtp + protocol = lmtp + hosts = ${env{LMTP_ADDRESS}{$value}{imap}} + rcpt_include_affixes = yes + user = $exim_uid + group = $exim_gid + + +###################################################################### +# RETRY CONFIGURATION # +###################################################################### + +begin retry + +# This single retry rule applies to all domains and all errors. It specifies +# retries every 15 minutes for 2 hours, then increasing retry intervals, +# starting at 1 hour and increasing each time by a factor of 1.5, up to 16 +# hours, then retries every 6 hours until 4 days have passed since the first +# failed delivery. + +# WARNING: If you do not have any retry rules at all (this section of the +# configuration is non-existent or empty), Exim will not do any retries of +# messages that fail to get delivered at the first attempt. The effect will +# be to treat temporary errors as permanent. Therefore, DO NOT remove this +# retry rule unless you really don't want any retries. + +# Address or Domain Error Retries +# ----------------- ----- ------- + +* * F,2h,15m; G,16h,1h,1.5; F,4d,6h + + + +###################################################################### +# REWRITE CONFIGURATION # +###################################################################### + +# There are no rewriting specifications in this default configuration file. + +begin rewrite + + + +###################################################################### +# AUTHENTICATION CONFIGURATION # +###################################################################### + +# The following authenticators support plaintext username/password +# authentication using the standard PLAIN mechanism and the traditional +# but non-standard LOGIN mechanism, with Exim acting as the server. +# PLAIN and LOGIN are enough to support most MUA software. +# +# These authenticators are not complete: you need to change the +# server_condition settings to specify how passwords are verified. +# They are set up to offer authentication to the client only if the +# connection is encrypted with TLS, so you also need to add support +# for TLS. See the global configuration options section at the start +# of this file for more about TLS. +# +# The default RCPT ACL checks for successful authentication, and will accept +# messages from authenticated users from anywhere on the Internet. + +begin authenticators + +# PLAIN authentication has no server prompts. The client sends its +# credentials in one lump, containing an authorization ID (which we do not +# use), an authentication ID, and a password. The latter two appear as +# $auth2 and $auth3 in the configuration and should be checked against a +# valid username and password. In a real configuration you would typically +# use $auth2 as a lookup key, and compare $auth3 against the result of the +# lookup, perhaps using the crypteq{}{} condition. + +PLAIN: + driver = plaintext + server_set_id = $auth2 + server_prompts = : + server_condition = ${if ldapauth{user="cn=${quote_ldap_dn:$auth2},ou=People,dc=shore,dc=co,dc=il" pass=${quote:$auth3} ldapi://${quote_ldap:/run/slapd/ldapi}}} + server_advertise_condition = ${if def:tls_in_cipher } + +# LOGIN authentication has traditional prompts and responses. There is no +# authorization ID in this mechanism, so unlike PLAIN the username and +# password are $auth1 and $auth2. Apart from that you can use the same +# server_condition setting for both authenticators. + +LOGIN: + driver = plaintext + server_set_id = $auth1 + server_prompts = <| Username: | Password: + server_condition = ${if ldapauth{user="cn=${quote_ldap_dn:$auth1},ou=People,dc=shore,dc=co,dc=il" pass=${quote:$auth2} ldapi://${quote_ldap:/run/slapd/ldapi}}} + server_advertise_condition = ${if def:tls_in_cipher } + + + +###################################################################### +# CONFIGURATION FOR local_scan() # +###################################################################### + +# If you have built Exim to include a local_scan() function that contains +# tables for private options, you can define those options here. Remember to +# uncomment the "begin" line. It is commented by default because it provokes +# an error with Exim binaries that are not built with LOCAL_SCAN_HAS_OPTIONS +# set in the Local/Makefile. + +# begin local_scan + + +# End of Exim configuration file -- GitLab