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[[Configuration#Certificate|Back to Configuration]]<br>
[[Rocky,_Alma,_Springdale_9_QT_Install|Back to Install]]<br>
= Security Certificate =
= Security Certificate =


== Self-Signed ==
== Self-Signed ==


  # SUBJ="/C=US/ST=Montana/L=Corvallis/O=WHTC/OU=IT/CN=mail.whitehorsetc.com/emailAddress=ebroch@whitehorsetc.com"
# cd /tmp
  # SUBJ="/C=US/ST=Indiana/L=Gary/O=COMPANY/OU=IT/CN=mail.domain.tld/emailAddress=user@domain.tld"
  # openssl req -x509 -newkey rsa:2048 -keyout key.pem -out cert.pem -sha256 -days 3650 -nodes -subj $SUBJ
  # openssl req -x509 -newkey rsa:2048 -keyout key.pem -out cert.pem -sha256 -days 3650 -nodes -subj $SUBJ
# cat cert.pem key.pem > servercert.pem
# cp servercert.pem /var/qmail/control/servercert.pem
# remove *.pem


<u>'''Security Certificate'''</u>
== Let's Encrypt ==
(assumes a functioning Apache web server for domain.tld)
# dnf -y install certbot python3-certbot-apache
# certbot --apache -d domain.tld -d mail.domain.tld <span style="color:red">--rsa-key-size 2048 --key-type rsa</span>


# Abstract: Create Certificate
A 2048 bit key should have been created (qmail won't run with anything less), if not, force it with RSA options <span style="color:red">(in red)</span> above.<br>
#: Generate key
Check the size of the private key with the following command
#: Generate signing request
#: Sign the key
#: Create server certificate
#: Set permission
#: Set owner
#: Copy into place
#: Restart services
#: Implementation
## Self-Signed Certificate
##: <nowiki>#</nowiki> openssl genrsa -out x.key 2048
##: <nowiki>#</nowiki> openssl req -new -key x.key -out x.csr
##: <nowiki>#</nowiki> openssl x509 -req -days 3650 -in x.csr -signkey x.key -out x.crt
##: <nowiki>#</nowiki> cat x.crt x.key > servercert.pem
##: <nowiki>#</nowiki> chmod 644 servercert.pem
##: <nowiki>#</nowiki> chown root<nowiki>:</nowiki>qmail servercert.pem
##: <nowiki>#</nowiki> cp -p servercert.pem /var/qmail/control
## Let's Encrypt (Assumes working web server)
##: <nowiki>#</nowiki> dnf -y install certbot python3-certbot-apache
##: <nowiki>#</nowiki> certbot -apache -d mydomain.com -d mail.mydomain.com
##; Apache
##: SSLCertificateFile /etc/letsencrypt/live/mydomain.com/cert.pem
##: SSLCertificateKeyFile /etc/letsencrypt/live/mydomain.com/privkey.pem
##: SSLCertificateChainFile /etc/letsencrypt/live/mydomain.com/fullchain.pem
##; Dovecot
##: ssl_cert = </etc/letsencrypt/live/mail.mydomain.com/fullchain.pem
##: ssl_key = </etc/letsencrypt/live/mail.mydomain.com/privkey.pem
##; Qmail
##: <nowiki>#</nowiki> cp -p /var/qmail/control/servercert.pem /var/qmail/control/servercert.pem.bak
##: <nowiki>#</nowiki> cat /etc/letsencrypt/live/mail.mydomain.com/privkey.pem /etc/letsencrypt/live/mail.mydomain.com/fullchain.pem > ./servercert.pem
##: <nowiki>#</nowiki> cp ./servercert.pem /var/qmail/control/servercert.pem
##; Cron auto renew (script below)
##: 0 0 * * * /opt/certbot/certbot renew
## Application: Godaddy Signed Certificate
##:<nowiki>#</nowiki> openssl genrsa -out x.key 2048
##:<nowiki>#</nowiki> openssl req -new -key x.key -out x.csr
##; Submit signing request (x.csr) to Godaddy; Later download signed key (crt and crt bundle)
##:<nowiki>#</nowiki> cat x.key 7531fdb8504afe19.crt gd_bundle-g2-g1.crt > servercert.pem
##:<nowiki>#</nowiki> chmod 644 servercert.pem
##:<nowiki>#</nowiki> chown root<nowiki>:</nowiki>qmail servercert.pem
##:<nowiki>#</nowiki> cp -p servercert.pem /var/qmail/control
# Restart Qmail and Dovecot
#:<nowiki>#</nowiki> qmailctl stop && sleep 2 && qmailctl start
#:<nowiki>#</nowiki> systemctl restart dovecot
#:<nowiki>#</nowiki> systemctl restart httpd


<pre>
# openssl rsa -in /etc/letsencrypt/live/mydomain.tld/privkey.pem  -text | grep Key
#!/bin/bash
 
Move key & certificate in place
 
# cp -p /var/qmail/control/servercert.pem /var/qmail/control/servercert.pem.bak
# cat /etc/letsencrypt/live/domain.tld/privkey.pem /etc/letsencrypt/live/mydomain.tld/fullchain.pem <nowiki>></nowiki> servercert.pem
# cp ./servercert.pem /var/qmail/control/servercert.pem
 
== GoDaddy ==
# cd /tmp
# SUBJ="/C=US/ST=Indiana/L=Gary/O=COMPANY/OU=IT/CN=mail.domain.tld/emailAddress=user@domain.tld"
# openssl req -new -newkey rsa:2048 -nodes -keyout key.pem -out csr.pem -subj $SUBJ
# openssl req -in csr.pem -noout -text <span style="color:red">(Examine your signing request)<span>
Submit signing request (csr.pem) to GoDaddy, download crt and crt bundle, pack, and move in place.
# cat key.pem 7531fdb8504afe19.crt gd_bundle-g2-g1.crt > servercert.pem
# cp servercert.pem /var/qmail/control
 
= Implementation =
 
== Restart Services ==
# qmailctl stop && sleep 2 && qmailctl start
# systemctl reload dovecot httpd


LOG=/usr/command/certs/certs.log
== Renew (Let's Encrypt) *with script ==
days=3
# crontab -e
0 0 * * * /opt/certbot/renewcerts renew


today=`date`
today=`date --date="$today" --utc +%s`
CD=/etc/letsencrypt/live
FC=fullchain.pem
PK=privkey.pem


mailcert () {
#!/bin/bash<br>
#  Script: renewcerts
# Function: renew certificates<br>
LOG=/usr/command/certs/certs.log
days=3<br>
today=`date`
today=`date --date="$today" --utc +%s`
CD=/etc/letsencrypt/live
FC=fullchain.pem
PK=privkey.pem<br>
mailcert () {
   cat $CD/$1/$PK $CD/$1/$FC > ./servercert.pem
   cat $CD/$1/$PK $CD/$1/$FC > ./servercert.pem
   cp -p /var/qmail/control/servercert.pem /var/qmail/control/servercert.pem.bak
   cp -p /var/qmail/control/servercert.pem /var/qmail/control/servercert.pem.bak
   cp ./servercert.pem  /var/qmail/control/servercert.pem
   cp servercert.pem  /var/qmail/control/servercert.pem
   systemctl reload dovecot   
   systemctl reload dovecot   
   qmailctl stop && sleep 2 && qmailctl start
   qmailctl stop && sleep 2 && qmailctl start
}
}<br>
 
for CDOM in `ls $CD`
for CDOM in `ls $CD`
do
do
   [ "$CDOM" = "README" ] && continue
   [ "$CDOM" = "README" ] && continue
   exp=`openssl x509 -dates -noout < $CD/$CDOM/$FC | grep notAfter | sed 's/notAfter=//'`
   exp=`openssl x509 -dates -noout < $CD/$CDOM/$FC | grep notAfter | sed 's/notAfter=//'`
Line 85: Line 76:
   if [ $diff -le $days ]
   if [ $diff -le $days ]
   then
   then
       certbot renew --cert-name $CDOM
       certbot renew --cert-name $CDOM --apache <span style="color:red">--rsa-key-size 2048 --key-type rsa</span>
       systemctl reload httpd
       systemctl reload httpd
       mailcert $CDOM
       mailcert $CDOM
   fi
   fi
done
done<br>
exit 0


exit 0
== Mail server settings ==


</pre>
=== Dovecot ===
ssl_cert = </var/qmail/control/servercert.pem
ssl_key = </var/qmail/control/servercert.pem


=Implementation (qmail run scripts)=  
===Submission===
==Submission==
<pre>
<pre>
#!/bin/sh
#!/bin/sh
Line 115: Line 108:
</pre>
</pre>


==SMTPS==
===SMTPS===
<pre>
<pre>
#!/bin/sh
#!/bin/sh

Latest revision as of 09:26, 19 October 2024

Back to Configuration
Back to Install

Security Certificate

Self-Signed

# cd /tmp
# SUBJ="/C=US/ST=Indiana/L=Gary/O=COMPANY/OU=IT/CN=mail.domain.tld/emailAddress=user@domain.tld"
# openssl req -x509 -newkey rsa:2048 -keyout key.pem -out cert.pem -sha256 -days 3650 -nodes -subj $SUBJ
# cat cert.pem key.pem > servercert.pem
# cp servercert.pem /var/qmail/control/servercert.pem
# remove *.pem

Let's Encrypt

(assumes a functioning Apache web server for domain.tld) 

# dnf -y install certbot python3-certbot-apache
# certbot --apache -d domain.tld -d mail.domain.tld --rsa-key-size 2048 --key-type rsa

A 2048 bit key should have been created (qmail won't run with anything less), if not, force it with RSA options (in red) above.
Check the size of the private key with the following command 

# openssl rsa -in /etc/letsencrypt/live/mydomain.tld/privkey.pem  -text | grep Key

Move key & certificate in place 

# cp -p /var/qmail/control/servercert.pem /var/qmail/control/servercert.pem.bak
# cat /etc/letsencrypt/live/domain.tld/privkey.pem /etc/letsencrypt/live/mydomain.tld/fullchain.pem > servercert.pem
# cp ./servercert.pem /var/qmail/control/servercert.pem

GoDaddy

# cd /tmp
# SUBJ="/C=US/ST=Indiana/L=Gary/O=COMPANY/OU=IT/CN=mail.domain.tld/emailAddress=user@domain.tld"
# openssl req -new -newkey rsa:2048 -nodes -keyout key.pem -out csr.pem -subj $SUBJ
# openssl req -in csr.pem -noout -text (Examine your signing request)

Submit signing request (csr.pem) to GoDaddy, download crt and crt bundle, pack, and move in place. 

# cat key.pem 7531fdb8504afe19.crt gd_bundle-g2-g1.crt > servercert.pem
# cp servercert.pem /var/qmail/control

Implementation

Restart Services

# qmailctl stop && sleep 2 && qmailctl start
# systemctl reload dovecot httpd

Renew (Let's Encrypt) *with script

# crontab -e
0 0 * * * /opt/certbot/renewcerts renew



#!/bin/bash

#   Script: renewcerts
# Function: renew certificates

LOG=/usr/command/certs/certs.log
days=3

today=`date`
today=`date --date="$today" --utc +%s`
CD=/etc/letsencrypt/live
FC=fullchain.pem
PK=privkey.pem

mailcert () {
  cat $CD/$1/$PK $CD/$1/$FC > ./servercert.pem
  cp -p /var/qmail/control/servercert.pem /var/qmail/control/servercert.pem.bak
  cp servercert.pem  /var/qmail/control/servercert.pem
  systemctl reload dovecot  
  qmailctl stop && sleep 2 && qmailctl start
}

for CDOM in `ls $CD`
do
  [ "$CDOM" = "README" ] && continue
  exp=`openssl x509 -dates -noout < $CD/$CDOM/$FC | grep notAfter | sed 's/notAfter=//'`
  off=`date --date="$exp" --utc +%s`
  diff=$(( (off - today)/86400 ))
  echo "Certificate Domain: $CDOM, Days to expire: $diff"
  echo ""
  if [ $diff -le $days ]
  then
     certbot renew --cert-name $CDOM --apache --rsa-key-size 2048 --key-type rsa
     systemctl reload httpd
     mailcert $CDOM
  fi
done

exit 0

Mail server settings

Dovecot

ssl_cert = </var/qmail/control/servercert.pem
ssl_key = </var/qmail/control/servercert.pem

Submission

#!/bin/sh
QMAILDUID=`id -u vpopmail`
NOFILESGID=`id -g vpopmail`
MAXSMTPD=`cat /var/qmail/control/concurrencyincoming`
SMTPD="/var/qmail/bin/qmail-smtpd"
TCP_CDB="/etc/tcprules.d/tcp.smtp.cdb"
HOSTNAME=`hostname`
VCHKPW="/home/vpopmail/bin/vchkpw"
export FORCETLS="1"
export SMTPAUTH="!"

exec /usr/bin/softlimit -m 128000000 \
    /usr/bin/tcpserver -v -R -H -l $HOSTNAME -x $TCP_CDB -c "$MAXSMTPD" \
    -u "$QMAILDUID" -g "$NOFILESGID" 0 587 \
    $SMTPD $VCHKPW /bin/true 2>&1

SMTPS

#!/bin/sh
QMAILDUID=`id -u vpopmail`
NOFILESGID=`id -g vpopmail`
MAXSMTPD=`cat /var/qmail/control/concurrencyincoming`
SMTPD="/var/qmail/bin/qmail-smtpd"
TCP_CDB="/etc/tcprules.d/tcp.smtp.cdb"
HOSTNAME=`hostname`
VCHKPW="/home/vpopmail/bin/vchkpw"
export SMTPS="1"
export FORCETLS="0"
export SMTPAUTH="!+cram"

exec /usr/bin/softlimit -m 128000000 \
    /usr/bin/tcpserver -v -R -H -l $HOSTNAME -x $TCP_CDB -c "$MAXSMTPD" \
    -u "$QMAILDUID" -g "$NOFILESGID" 0 465 \
    $SMTPD $VCHKPW /bin/true 2>&1
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