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emailwiz.sh
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334
emailwiz.sh
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#!/bin/sh
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# THE SETUP
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# Mail will be stored in non-retarded Maildirs because it's $currentyear. This
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# makes it easier for use with isync, which is what I care about so I can have
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# an offline repo of mail.
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# The mailbox names are: Inbox, Sent, Drafts, Archive, Junk, Trash
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# Use the typical unix login system for mail users. Users will log into their
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# email with their passnames on the server. No usage of a redundant mySQL
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# database to do this.
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# DEPENDENCIES BEFORE RUNNING
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# 1. Have a Arch system with a static IP and all that. Pretty much any
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# default VPS offered by a company will have all the basic stuff you need. This
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# script might run on Artix as well. Haven't tried it. If you have, tell me
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# what happens.
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# 2. Have a Let's Encrypt SSL certificate for $maildomain. You might need one
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# for $domain as well, but they're free with Let's Encypt so you should have
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# them anyway.
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# 3. If you've been toying around with your server settings trying to get
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# postfix/dovecot/etc. working before running this, I recommend you `pacman -Rn`
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# everything first because this script is build on top of only the defaults.
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# Clear out /etc/postfix and /etc/dovecot yourself if needbe.
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echo 'Installing programs...'
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pacman -Syu --needed postfix dovecot opendkim spamassassin pigeonhole
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# Put your domain.tld here (not your subdomain)
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domain='domain.tld'
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subdom=${MAIL_SUBDOM:-mail}
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maildomain="$subdom.$domain"
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certdir="/etc/letsencrypt/live/$maildomain"
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[ ! -d "$certdir" ] && certdir="$(dirname "$(certbot certificates 2>/dev/null | grep "$maildomain\|*.$domain" -A 2 | awk '/Certificate Path/ {print $3}' | head -n1)")"
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[ ! -d "$certdir" ] && echo "Note! You must first have a Let's Encrypt Certbot HTTPS/SSL Certificate for $maildomain.
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Use Let's Encrypt's Certbot to get that and then rerun this script.
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You may need to set up a dummy $maildomain site in nginx or Apache for that to work." && exit 1
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# NOTE ON POSTCONF COMMANDS
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# The `postconf` command literally just adds the line in question to
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# /etc/postfix/main.cf so if you need to debug something, go there. It replaces
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# any other line that sets the same setting, otherwise it is appended to the
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# end of the file.
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echo "Configuring Postfix's main.cf..."
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# Necessary to later start Postfix
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postalias /etc/postfix/aliases
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# Change the cert/key files to the default locations of the Let's Encrypt cert/key
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postconf -e "smtpd_tls_key_file=$certdir/privkey.pem"
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postconf -e "smtpd_tls_cert_file=$certdir/fullchain.pem"
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postconf -e "smtp_tls_CAfile=$certdir/cert.pem"
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# Enable, but do not require TLS. Requiring it with other server would cause
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# mail delivery problems and requiring it locally would cause many other
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# issues.
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postconf -e 'smtpd_tls_security_level = may'
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postconf -e 'smtp_tls_security_level = may'
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# TLS required for authentication.
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postconf -e 'smtpd_tls_auth_only = yes'
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# Exclude obsolete, insecure and obsolete encryption protocols.
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postconf -e 'smtpd_tls_mandatory_protocols = >=TLSv1.2, <=TLSv1.3'
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postconf -e 'smtp_tls_mandatory_protocols = >=TLSv1.2, <=TLSv1.3'
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postconf -e 'smtpd_tls_protocols = >=TLSv1.2, <=TLSv1.3'
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postconf -e 'smtp_tls_protocols = >=TLSv1.2, <=TLSv1.3'
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# Exclude suboptimal ciphers.
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postconf -e 'tls_preempt_cipherlist = yes'
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postconf -e 'smtpd_tls_ciphers = high'
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postconf -e 'smtpd_tls_exclude_ciphers = aNULL, eNULL, EXPORT, LOW, EXP, MEDIUM, ADH, AECDH, DSS, ECDSA, CAMELLIA128, 3DES, CAMELLIA256, RSA+AES, DES, RC4, MD5, PSK, aECDH, EDH-DSS-DES-CBC3-SHA, EDH-RSA-DES-CBC3-SHA, KRB5-DES, CBC3-SHA'
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# Here we tell Postfix to look to Dovecot for authenticating users/passwords.
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# Dovecot will be putting an authentication socket in /var/spool/postfix/private/auth
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postconf -e 'smtpd_sasl_auth_enable = yes'
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postconf -e 'smtpd_sasl_type = dovecot'
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postconf -e 'smtpd_sasl_path = private/auth'
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# Sender and recipient restrictions
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postconf -e 'smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination'
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# Prevent IP address leaks (also removes ip from incoming email)
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postconf -e 'header_checks = regexp:/etc/postfix/header_checks'
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echo '/^Received: .*/ IGNORE
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/^User-Agent: .*/ IGNORE
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/^X-Originating-IP:/ IGNORE' >> /etc/postfix/header_checks
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# NOTE: the trailing slash here, or for any directory name in the home_mailbox
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# command, is necessary as it distinguishes a maildir (which is the actual
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# directories that what we want) from a spoolfile (which is what old unix
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# boomers want and no one else).
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postconf -e 'home_mailbox = Mail/Inbox/'
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# master.cf
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echo "Configuring Postfix's master.cf..."
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sed -i '/^\s*-o/d;/^\s*submission/d;/^\s*smtp/d' /etc/postfix/master.cf
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echo 'smtp unix - - n - - smtp
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smtp inet n - n - - smtpd
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-o content_filter=spamassassin
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submission inet n - n - - smtpd
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-o syslog_name=postfix/submission
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-o smtpd_tls_security_level=encrypt
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-o smtpd_sasl_auth_enable=yes
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-o smtpd_tls_auth_only=yes
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smtps inet n - n - - smtpd
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-o syslog_name=postfix/smtps
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-o smtpd_tls_wrappermode=yes
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-o smtpd_sasl_auth_enable=yes
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spamassassin unix - n n - - pipe
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flags=R user=spamd argv=/usr/bin/vendor_perl/spamc -e /usr/bin/sendmail -oi -f ${sender} ${recipient}' >> /etc/postfix/master.cf
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# By default, Dovecot has a bunch of example configs in `/usr/share/doc/dovecot/example-config/` These
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# files have nice documentation if you want to read it, but it's a huge pain to go through them to organize.
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# Instead, we simply use /etc/dovecot/dovecot.conf because it's easier to manage.
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echo 'Generating a DH parameters file for Dovecot...'
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mkdir -p /etc/dovecot
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openssl dhparam -out /etc/dovecot/dh.pem 4096
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echo 'Creating Dovecot config...'
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echo "# Note that in the Dovecot conf, you can use:
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# %u for username
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# %n for the name in name@domain.tld
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# %d for the domain
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# %h the user's home directory
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# If you're not a brainlet, SSL must be set to required.
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ssl = required
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ssl_cert = <$certdir/fullchain.pem
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ssl_key = <$certdir/privkey.pem
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ssl_min_protocol = TLSv1.2
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ssl_cipher_list=ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!LOW:!MEDIUM:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA
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ssl_prefer_server_ciphers = yes
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ssl_dh = </etc/dovecot/dh.pem
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# Plaintext login. This is safe and easy thanks to SSL.
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auth_mechanisms = plain login
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auth_username_format = %n
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protocols = \$protocols imap
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# Search for valid users in /etc/passwd
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userdb {
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driver = passwd
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}
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#Fallback: Use plain old PAM to find user passwords
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passdb {
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driver = pam
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}
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# Our mail for each user will be in ~/Mail, and the inbox will be ~/Mail/Inbox
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# The LAYOUT option is also important because otherwise, the boxes will be \`.Sent\` instead of \`Sent\`.
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mail_location = maildir:~/Mail:INBOX=~/Mail/Inbox:LAYOUT=fs
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namespace inbox {
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inbox = yes
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mailbox Drafts {
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special_use = \\Drafts
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auto = subscribe
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}
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mailbox Junk {
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special_use = \\Junk
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auto = subscribe
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autoexpunge = 30d
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}
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mailbox Sent {
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special_use = \\Sent
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auto = subscribe
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}
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mailbox Trash {
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special_use = \\Trash
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}
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mailbox Archive {
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special_use = \\Archive
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}
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}
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# Here we let Postfix use Dovecot's authetication system.
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service auth {
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unix_listener /var/spool/postfix/private/auth {
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mode = 0660
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user = postfix
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group = postfix
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}
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}
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protocol lda {
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mail_plugins = \$mail_plugins sieve
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}
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protocol lmtp {
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mail_plugins = \$mail_plugins sieve
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}
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plugin {
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sieve = ~/.dovecot.sieve
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sieve_default = /var/lib/dovecot/sieve/default.sieve
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sieve_dir = ~/.sieve
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sieve_global = /var/lib/dovecot/sieve/
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}
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" > /etc/dovecot/dovecot.conf
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mkdir -p /var/lib/dovecot/
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mkdir -p /var/lib/dovecot/sieve/
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echo "require [\"fileinto\", \"mailbox\"];
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if header :contains \"X-Spam-Flag\" \"YES\"
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{
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fileinto \"Junk\";
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}" > /var/lib/dovecot/sieve/default.sieve
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grep -q '^vmail:' /etc/passwd || useradd vmail
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chown -R vmail:vmail /var/lib/dovecot
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sievec /var/lib/dovecot/sieve/default.sieve
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echo 'Preparing user authentication...'
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grep -q nullok /etc/pam.d/dovecot ||
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echo 'auth required pam_unix.so nullok
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account required pam_unix.so' >> /etc/pam.d/dovecot
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# OpenDKIM
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# A lot of the big name email services, like Google, will automatically reject
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# as spam unfamiliar and unauthenticated email addresses. As in, the server
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# will flatly reject the email, not even delivering it to someone's Spam
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# folder.
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# OpenDKIM is a way to authenticate your email so you can send to such services
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# without a problem.
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# Create an OpenDKIM key in the proper place with proper permissions.
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echo 'Generating OpenDKIM keys...'
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mkdir -p /etc/postfix/dkim
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opendkim-genkey -D /etc/postfix/dkim/ -d "$domain" -s "$subdom"
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# Generate the OpenDKIM info:
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echo 'Configuring OpenDKIM...'
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grep -q "$domain" /etc/postfix/dkim/keytable 2>/dev/null ||
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echo "$subdom._domainkey.$domain $domain:$subdom:/etc/postfix/dkim/$subdom.private" >> /etc/postfix/dkim/keytable
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grep -q "$domain" /etc/postfix/dkim/signingtable 2>/dev/null ||
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echo "*@$domain $subdom._domainkey.$domain" >> /etc/postfix/dkim/signingtable
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grep -q '127.0.0.1' /etc/postfix/dkim/trustedhosts 2>/dev/null ||
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echo '127.0.0.1' >> /etc/postfix/dkim/trustedhosts
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# ...and source it from opendkim.conf
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cp /usr/share/doc/opendkim/opendkim.conf.sample /etc/opendkim/opendkim.conf
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sed -i "s/^Domain/Domain $domain/" /etc/opendkim/opendkim.conf
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sed -i 's/example.com//g' /etc/opendkim/opendkim.conf
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grep -q '^KeyTable' /etc/opendkim/opendkim.conf 2>/dev/null || echo 'KeyTable file:/etc/postfix/dkim/keytable
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SigningTable refile:/etc/postfix/dkim/signingtable
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InternalHosts refile:/etc/postfix/dkim/trustedhosts' >> /etc/opendkim/opendkim.conf
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sed -i '/^#Canonicalization/s/simple/relaxed\/simple/' /etc/opendkim/opendkim.conf
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sed -i '/^#Canonicalization/s/^#//' /etc/opendkim/opendkim.conf
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sed -i '/Socket/s/^#*/#/' /etc/opendkim/opendkim.conf
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grep -q '^Socket\s*inet:12301@localhost' /etc/opendkim/opendkim.conf || echo 'Socket inet:12301@localhost' >> /etc/opendkim/opendkim.conf
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# Here we add to postconf the needed settings for working with OpenDKIM
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echo "Configuring Postfix with OpenDKIM settings..."
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postconf -e 'smtpd_sasl_security_options = noanonymous, noplaintext'
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postconf -e 'smtpd_sasl_tls_security_options = noanonymous'
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postconf -e "myhostname = $domain"
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postconf -e 'milter_default_action = accept'
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postconf -e 'milter_protocol = 6'
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postconf -e 'smtpd_milters = inet:localhost:12301'
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postconf -e 'non_smtpd_milters = inet:localhost:12301'
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postconf -e 'mailbox_command = /usr/lib/dovecot/deliver'
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for x in spamassassin opendkim dovecot postfix; do
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printf "Restarting %s..." "$x"
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systemctl enable restart "$x" && printf " ...done\\n"
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done
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pval="$(tr -d "\n" </etc/postfix/dkim/$subdom.txt | sed "s/k=rsa.* \"p=/k=rsa; p=/;s/\"\s*\"//;s/\"\s*).*//" | grep -o "p=.*")"
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dkimentry="$subdom._domainkey.$domain TXT v=DKIM1; k=rsa; $pval"
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dmarcentry="_dmarc.$domain TXT v=DMARC1; p=reject; rua=mailto:dmarc@$domain; fo=1"
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spfentry="$domain TXT v=spf1 mx a:$maildomain -all"
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useradd -m -G mail dmarc
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echo "$dkimentry
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$dmarcentry
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$spfentry" > "$HOME/dns_emailwizard"
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printf "\033[31m
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_ _
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| \ | | _____ ___
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| \| |/ _ \ \ /\ / (_)
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| |\ | (_) \ V V / _
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|_| \_|\___/ \_/\_/ (_)\033[0m
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Add these three records to your DNS TXT records on either your registrar's site
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or your DNS server:
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\033[32m
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$dkimentry
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$dmarcentry
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$spfentry
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\033[0m
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NOTE: You may need to omit the \`.$domain\` portion at the beginning if
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inputting them in a registrar's web interface.
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Also, these are now saved to \033[34m~/dns_emailwizard\033[0m in case you want them in a file.
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Once you do that, you're done! Check the README for how to add users/accounts
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and how to log in.
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"
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