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  1. #!/bin/sh
  2. # BEFORE INSTALLING
  3. # Have a Debian or Ubuntu server with a static IP and DNS records (usually
  4. # A/AAAA) that point your domain name to it.
  5. # NOTE WHILE INSTALLING
  6. # On installation of Postfix, select "Internet Site" and put in TLD (without
  7. # `mail.` before it).
  8. # AFTER INSTALLING
  9. # More DNS records will be given to you to install. One of them will be
  10. # different for every installation and is uniquely generated on your machine.
  11. umask 0022
  12. apt-get install -y postfix postfix-pcre dovecot-imapd dovecot-sieve opendkim opendkim-tools spamassassin spamc net-tools fail2ban
  13. domain="$(cat /etc/mailname)"
  14. subdom=${MAIL_SUBDOM:-mail}
  15. maildomain="$subdom.$domain"
  16. certdir="/etc/letsencrypt/live/$maildomain"
  17. # Open required mail ports, and 80, for Certbot.
  18. for port in 80 993 465 25 587; do
  19. ufw allow "$port" 2>/dev/null
  20. done
  21. [ ! -d "$certdir" ] &&
  22. possiblecert="$(certbot certificates 2>/dev/null | grep "Domains:\.* \(\*\.$domain\|$maildomain\)\(\s\|$\)" -A 2 | awk '/Certificate Path/ {print $3}' | head -n1)" &&
  23. certdir="${possiblecert%/*}"
  24. [ ! -d "$certdir" ] &&
  25. certdir="/etc/letsencrypt/live/$maildomain" &&
  26. case "$(netstat -tulpn | grep ":80\s")" in
  27. *nginx*)
  28. apt install -y python3-certbot-nginx
  29. certbot -d "$maildomain" certonly --nginx --register-unsafely-without-email --agree-tos
  30. ;;
  31. *apache*)
  32. apt install -y python3-certbot-apache
  33. certbot -d "$maildomain" certonly --apache --register-unsafely-without-email --agree-tos
  34. ;;
  35. *)
  36. apt install -y python3-certbot
  37. certbot -d "$maildomain" certonly --standalone --register-unsafely-without-email --agree-tos
  38. ;;
  39. esac
  40. [ ! -d "$certdir" ] && echo "Error locating or installing SSL certificate." && exit 1
  41. echo "Configuring Postfix's main.cf..."
  42. # Change the cert/key files to the default locations of the Let's Encrypt cert/key
  43. postconf -e "smtpd_tls_key_file=$certdir/privkey.pem"
  44. postconf -e "smtpd_tls_cert_file=$certdir/fullchain.pem"
  45. postconf -e "smtp_tls_CAfile=$certdir/cert.pem"
  46. # Enable, but do not require TLS. Requiring it with other server would cause
  47. # mail delivery problems and requiring it locally would cause many other
  48. # issues.
  49. postconf -e 'smtpd_tls_security_level = may'
  50. postconf -e 'smtp_tls_security_level = may'
  51. # TLS required for authentication.
  52. postconf -e 'smtpd_tls_auth_only = yes'
  53. # Exclude obsolete, insecure and obsolete encryption protocols.
  54. postconf -e 'smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1'
  55. postconf -e 'smtp_tls_mandatory_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1'
  56. postconf -e 'smtpd_tls_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1'
  57. postconf -e 'smtp_tls_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1'
  58. # Exclude suboptimal ciphers.
  59. postconf -e 'tls_preempt_cipherlist = yes'
  60. postconf -e 'smtpd_tls_exclude_ciphers = aNULL, LOW, EXP, MEDIUM, ADH, AECDH, MD5, DSS, ECDSA, CAMELLIA128, 3DES, CAMELLIA256, RSA+AES, eNULL'
  61. # Here we tell Postfix to look to Dovecot for authenticating users/passwords.
  62. # Dovecot will be putting an authentication socket in /var/spool/postfix/private/auth
  63. postconf -e 'smtpd_sasl_auth_enable = yes'
  64. postconf -e 'smtpd_sasl_type = dovecot'
  65. postconf -e 'smtpd_sasl_path = private/auth'
  66. # helo, sender, relay and recipient restrictions
  67. postconf -e "smtpd_sender_login_maps = pcre:/etc/postfix/login_maps.pcre"
  68. postconf -e 'smtpd_sender_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_sender_login_mismatch, reject_unknown_reverse_client_hostname, reject_unknown_sender_domain'
  69. postconf -e 'smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination, reject_unknown_recipient_domain'
  70. postconf -e 'smtpd_relay_restrictions = permit_sasl_authenticated, reject_unauth_destination'
  71. postconf -e 'smtpd_helo_required = yes'
  72. postconf -e 'smtpd_helo_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname, reject_unknown_helo_hostname'
  73. # NOTE: the trailing slash here, or for any directory name in the home_mailbox
  74. # command, is necessary as it distinguishes a maildir (which is the actual
  75. # directories that what we want) from a spoolfile (which is what old unix
  76. # boomers want and no one else).
  77. postconf -e 'home_mailbox = Mail/Inbox/'
  78. # Prevent "Received From:" header in sent emails in order to prevent leakage of public ip addresses
  79. postconf -e "header_checks = regexp:/etc/postfix/header_checks"
  80. # strips "Received From:" in sent emails
  81. echo "/^Received:.*/ IGNORE
  82. /^X-Originating-IP:/ IGNORE" >> /etc/postfix/header_checks
  83. # Create a login map file that ensures that if a sender wants to send a mail from a user at our local
  84. # domain, they must be authenticated as that user
  85. echo "/^(.*)@$(sh -c "echo $domain | sed 's/\./\\\./'")$/ \${1}" > /etc/postfix/login_maps.pcre
  86. # master.cf
  87. echo "Configuring Postfix's master.cf..."
  88. sed -i '/^\s*-o/d;/^\s*submission/d;/^\s*smtp/d' /etc/postfix/master.cf
  89. echo "smtp unix - - n - - smtp
  90. smtp inet n - y - - smtpd
  91. -o content_filter=spamassassin
  92. submission inet n - y - - smtpd
  93. -o syslog_name=postfix/submission
  94. -o smtpd_tls_security_level=encrypt
  95. -o smtpd_sasl_auth_enable=yes
  96. -o smtpd_tls_auth_only=yes
  97. smtps inet n - y - - smtpd
  98. -o syslog_name=postfix/smtps
  99. -o smtpd_tls_wrappermode=yes
  100. -o smtpd_sasl_auth_enable=yes
  101. spamassassin unix - n n - - pipe
  102. user=debian-spamd argv=/usr/bin/spamc -f -e /usr/sbin/sendmail -oi -f \${sender} \${recipient}" >> /etc/postfix/master.cf
  103. # By default, dovecot has a bunch of configs in /etc/dovecot/conf.d/ These
  104. # files have nice documentation if you want to read it, but it's a huge pain to
  105. # go through them to organize. Instead, we simply overwrite
  106. # /etc/dovecot/dovecot.conf because it's easier to manage. You can get a backup
  107. # of the original in /usr/share/dovecot if you want.
  108. mv /etc/dovecot/dovecot.conf /etc/dovecot/dovecot.backup.conf
  109. echo "Creating Dovecot config..."
  110. echo "# Dovecot config
  111. # Note that in the dovecot conf, you can use:
  112. # %u for username
  113. # %n for the name in name@domain.tld
  114. # %d for the domain
  115. # %h the user's home directory
  116. ssl = required
  117. ssl_cert = <$certdir/fullchain.pem
  118. ssl_key = <$certdir/privkey.pem
  119. ssl_min_protocol = TLSv1.2
  120. ssl_cipher_list = "'EECDH+ECDSA+AESGCM:EECDH+aRSA+AESGCM:EECDH+ECDSA+SHA256:EECDH+aRSA+SHA256:EECDH+ECDSA+SHA384:EECDH+ECDSA+SHA256:EECDH+aRSA+SHA384:EDH+aRSA+AESGCM:EDH+aRSA+SHA256:EDH+aRSA:EECDH:!aNULL:!eNULL:!MEDIUM:!LOW:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS:!RC4:!SEED'"
  121. ssl_prefer_server_ciphers = yes
  122. ssl_dh = </usr/share/dovecot/dh.pem
  123. auth_mechanisms = plain login
  124. auth_username_format = %n
  125. protocols = \$protocols imap
  126. # Search for valid users in /etc/passwd
  127. userdb {
  128. driver = passwd
  129. }
  130. #Fallback: Use plain old PAM to find user passwords
  131. passdb {
  132. driver = pam
  133. }
  134. # Our mail for each user will be in ~/Mail, and the inbox will be ~/Mail/Inbox
  135. # The LAYOUT option is also important because otherwise, the boxes will be \`.Sent\` instead of \`Sent\`.
  136. mail_location = maildir:~/Mail:INBOX=~/Mail/Inbox:LAYOUT=fs
  137. namespace inbox {
  138. inbox = yes
  139. mailbox Drafts {
  140. special_use = \\Drafts
  141. auto = subscribe
  142. }
  143. mailbox Junk {
  144. special_use = \\Junk
  145. auto = subscribe
  146. autoexpunge = 30d
  147. }
  148. mailbox Sent {
  149. special_use = \\Sent
  150. auto = subscribe
  151. }
  152. mailbox Trash {
  153. special_use = \\Trash
  154. }
  155. mailbox Archive {
  156. special_use = \\Archive
  157. }
  158. }
  159. # Here we let Postfix use Dovecot's authetication system.
  160. service auth {
  161. unix_listener /var/spool/postfix/private/auth {
  162. mode = 0660
  163. user = postfix
  164. group = postfix
  165. }
  166. }
  167. protocol lda {
  168. mail_plugins = \$mail_plugins sieve
  169. }
  170. protocol lmtp {
  171. mail_plugins = \$mail_plugins sieve
  172. }
  173. plugin {
  174. sieve = ~/.dovecot.sieve
  175. sieve_default = /var/lib/dovecot/sieve/default.sieve
  176. #sieve_global_path = /var/lib/dovecot/sieve/default.sieve
  177. sieve_dir = ~/.sieve
  178. sieve_global_dir = /var/lib/dovecot/sieve/
  179. }
  180. " > /etc/dovecot/dovecot.conf
  181. # If using an old version of Dovecot, remove the ssl_dl line.
  182. case "$(dovecot --version)" in
  183. 1|2.1*|2.2*) sed -i '/^ssl_dh/d' /etc/dovecot/dovecot.conf ;;
  184. esac
  185. mkdir /var/lib/dovecot/sieve/
  186. echo "require [\"fileinto\", \"mailbox\"];
  187. if header :contains \"X-Spam-Flag\" \"YES\"
  188. {
  189. fileinto \"Junk\";
  190. }" > /var/lib/dovecot/sieve/default.sieve
  191. grep -q '^vmail:' /etc/passwd || useradd vmail
  192. chown -R vmail:vmail /var/lib/dovecot
  193. sievec /var/lib/dovecot/sieve/default.sieve
  194. echo 'Preparing user authentication...'
  195. grep -q nullok /etc/pam.d/dovecot ||
  196. echo 'auth required pam_unix.so nullok
  197. account required pam_unix.so' >> /etc/pam.d/dovecot
  198. # OpenDKIM
  199. # A lot of the big name email services, like Google, will automatically reject
  200. # as spam unfamiliar and unauthenticated email addresses. As in, the server
  201. # will flatly reject the email, not even delivering it to someone's Spam
  202. # folder.
  203. # OpenDKIM is a way to authenticate your email so you can send to such services
  204. # without a problem.
  205. # Create an OpenDKIM key in the proper place with proper permissions.
  206. echo 'Generating OpenDKIM keys...'
  207. mkdir -p "/etc/postfix/dkim/$domain"
  208. opendkim-genkey -D "/etc/postfix/dkim/$domain" -d "$domain" -s "$subdom"
  209. chgrp -R opendkim /etc/postfix/dkim/*
  210. chmod -R g+r /etc/postfix/dkim/*
  211. # Generate the OpenDKIM info:
  212. echo 'Configuring OpenDKIM...'
  213. grep -q "$domain" /etc/postfix/dkim/keytable 2>/dev/null ||
  214. echo "$subdom._domainkey.$domain $domain:$subdom:/etc/postfix/dkim/$domain/$subdom.private" >> /etc/postfix/dkim/keytable
  215. grep -q "$domain" /etc/postfix/dkim/signingtable 2>/dev/null ||
  216. echo "*@$domain $subdom._domainkey.$domain" >> /etc/postfix/dkim/signingtable
  217. grep -q '127.0.0.1' /etc/postfix/dkim/trustedhosts 2>/dev/null ||
  218. echo '127.0.0.1
  219. 10.1.0.0/16' >> /etc/postfix/dkim/trustedhosts
  220. # ...and source it from opendkim.conf
  221. grep -q '^KeyTable' /etc/opendkim.conf 2>/dev/null || echo 'KeyTable file:/etc/postfix/dkim/keytable
  222. SigningTable refile:/etc/postfix/dkim/signingtable
  223. InternalHosts refile:/etc/postfix/dkim/trustedhosts' >> /etc/opendkim.conf
  224. sed -i '/^#Canonicalization/s/simple/relaxed\/simple/' /etc/opendkim.conf
  225. sed -i '/^#Canonicalization/s/^#//' /etc/opendkim.conf
  226. sed -i '/Socket/s/^#*/#/' /etc/opendkim.conf
  227. grep -q '^Socket\s*inet:12301@localhost' /etc/opendkim.conf || echo 'Socket inet:12301@localhost' >> /etc/opendkim.conf
  228. # OpenDKIM daemon settings, removing previously activated socket.
  229. sed -i '/^SOCKET/d' /etc/default/opendkim && echo "SOCKET=\"inet:12301@localhost\"" >> /etc/default/opendkim
  230. # Here we add to postconf the needed settings for working with OpenDKIM
  231. echo 'Configuring Postfix with OpenDKIM settings...'
  232. postconf -e 'smtpd_sasl_security_options = noanonymous, noplaintext'
  233. postconf -e 'smtpd_sasl_tls_security_options = noanonymous'
  234. postconf -e "myhostname = $domain"
  235. postconf -e 'milter_default_action = accept'
  236. postconf -e 'milter_protocol = 6'
  237. postconf -e 'smtpd_milters = inet:localhost:12301'
  238. postconf -e 'non_smtpd_milters = inet:localhost:12301'
  239. postconf -e 'mailbox_command = /usr/lib/dovecot/deliver'
  240. # A fix for "Opendkim won't start: can't open PID file?", as specified here: https://serverfault.com/a/847442
  241. /lib/opendkim/opendkim.service.generate
  242. systemctl daemon-reload
  243. # Enable fail2ban security for dovecot and postfix.
  244. [ ! -f /etc/fail2ban/jail.d/emailwiz.local ] && echo "[postfix]
  245. enabled = true
  246. [postfix-sasl]
  247. enabled = true
  248. [sieve]
  249. enabled = true
  250. [dovecot]
  251. enabled = true" > /etc/fail2ban/jail.d/emailwiz.local
  252. for x in spamassassin opendkim dovecot postfix fail2ban; do
  253. printf "Restarting %s..." "$x"
  254. service "$x" restart && printf " ...done\\n"
  255. systemctl enable "$x"
  256. done
  257. pval="$(tr -d '\n' <"/etc/postfix/dkim/$domain/$subdom.txt" | sed "s/k=rsa.* \"p=/k=rsa; p=/;s/\"\s*\"//;s/\"\s*).*//" | grep -o 'p=.*')"
  258. dkimentry="$subdom._domainkey.$domain TXT v=DKIM1; k=rsa; $pval"
  259. dmarcentry="_dmarc.$domain TXT v=DMARC1; p=reject; rua=mailto:dmarc@$domain; fo=1"
  260. spfentry="$domain TXT v=spf1 mx a:$maildomain -all"
  261. mxentry="$domain MX 10 $maildomain 300"
  262. useradd -m -G mail dmarc
  263. # Create a cronjob that deletes month-old dmarc feedback:
  264. cat <<EOF > /etc/cron.weekly/dmarc-clean
  265. #!/bin/sh
  266. find /home/dmarc/Mail -type f -mtime +30 -name '*.mail*' -delete
  267. EOF
  268. chmod 755 /etc/cron.weekly/dmarc-clean
  269. grep -q '^deploy-hook = echo "$RENEWED_DOMAINS" | grep -q' /etc/letsencrypt/cli.ini ||
  270. echo "
  271. deploy-hook = echo \"\$RENEWED_DOMAINS\" | grep -q '$maildomain' && service postfix reload && service dovecot reload" >> /etc/letsencrypt/cli.ini
  272. echo "NOTE: Elements in the entries might appear in a different order in your registrar's DNS settings.
  273. $dkimentry
  274. $dmarcentry
  275. $spfentry
  276. $mxentry" > "$HOME/dns_emailwizard"
  277. printf "\033[31m
  278. _ _
  279. | \ | | _____ ___
  280. | \| |/ _ \ \ /\ / (_)
  281. | |\ | (_) \ V V / _
  282. |_| \_|\___/ \_/\_/ (_)\033[0m
  283. Add these three records to your DNS TXT records on either your registrar's site
  284. or your DNS server:
  285. \033[32m
  286. $dkimentry
  287. $dmarcentry
  288. $spfentry
  289. $mxentry
  290. \033[0m
  291. NOTE: You may need to omit the \`.$domain\` portion at the beginning if
  292. inputting them in a registrar's web interface.
  293. Also, these are now saved to \033[34m~/dns_emailwizard\033[0m in case you want them in a file.
  294. Once you do that, you're done! Check the README for how to add users/accounts
  295. and how to log in.\n"