Apache httpd : Configure mod_md2023/04/28

	Install and Configure [mod_md] to automate managing certificates from Let's Encrypt. It's possible to configure each VirtualHost. And it's not need to configure manual SSL/TLS setting like here for the Site with [mod_md]. Also it needs that it's possible to access from the Internet to the Site with [mod_md] because of verification from Let's Encrypt.
[1]	Install [mod_md].

[root@www ~]#

dnf -y install mod_md

[root@www ~]#

systemctl restart httpd

# after installing, [mod_md] is enabled

[root@www ~]#

cat /etc/httpd/conf.modules.d/01-md.conf

LoadModule md_module modules/mod_md.so

[2]	Configure [mod_md].

[root@www ~]#

vi /etc/httpd/conf.d/acme.conf

# create new

MDBaseServer              on
MDCertificateProtocol     ACME
MDCAChallenges            http-01
MDDriveMode               auto
MDPrivateKeys             RSA 2048
MDRenewWindow             33%
MDStoreDir                md
MDCertificateAuthority    https://acme-v02.api.letsencrypt.org/directory
MDCertificateAgreement    https://letsencrypt.org/documents/LE-SA-v1.2-November-15-2017.pdf

<Location "/md-status">
    SetHandler md-status
    Require ip 127.0.0.1 10.0.0.0/24
</Location>

# [MDRenewWindow]
# default is [33%] if not specified
# if validity of certificates falls specified duration,
# [mod_md] will get new certificates
# 90 days * 33% ≒ 30 days
# if you'd like to set with day, specify [d]
# 30 days ⇒ [30d]

# [MDStoreDir]
# the directory certificates or other data are stored
# if not specified, default is [md]
# it is relative path from [ServerRoot] in [httpd.conf]

# [md-status]
# monitor MD status

[3]	If SELinux is enabled, change policy.

[root@www ~]#

setsebool -P httpd_can_network_connect on

[root@www ~]#

vi mod-md.te

# create new

module mod-md 1.0;

require {
        type httpd_config_t;
        type httpd_t;
        class dir { add_name create remove_name rename reparent rmdir setattr write };
        class file { create rename setattr unlink write };
}

#============= httpd_t ==============
allow httpd_t httpd_config_t:dir { add_name create remove_name rename reparent rmdir setattr write };
allow httpd_t httpd_config_t:file { create rename setattr unlink write };

[root@www ~]#

checkmodule -m -M -o mod-md.mod mod-md.te

[root@www ~]#

semodule_package --outfile mod-md.pp --module mod-md.mod

[root@www ~]#

semodule -i mod-md.pp

[4]	Configure each VirtualHost you'd like to set [mod_md]. It needs to specify valid email address for each [ServerAdmin] directive because Let's Encrypt will send various notification.

# for example, set on the site [rx-9.srv.world] site

[root@www ~]#

vi /etc/httpd/conf.d/rx-9.srv.world.conf

MDomain rx-9.srv.world
MDCertificateAgreement accepted
DirectoryIndex index.html
ServerAdmin root@rx-9.srv.world

<VirtualHost *:80>
    DocumentRoot /var/www/rx-9.srv.world
    ServerName rx-9.srv.world
</VirtualHost>

<VirtualHost *:443>
    SSLEngine on
    DocumentRoot /var/www/rx-9.srv.world
    ServerName rx-9.srv.world
</VirtualHost>

[root@www ~]#

systemctl reload httpd

# on initial start, some validation checks run and
# dumy certificate is created under the directory you set for [MDStoreDir]

[root@www ~]#

ll /etc/httpd/md/domains/rx-9.srv.world

total 12
-rw-------. 1 root root 1704 Apr 28 09:07 fallback-privkey.pem
-rw-------. 1 root root 1168 Apr 28 09:07 fallback-pubcert.pem
-rw-------. 1 root root  596 Apr 28 09:07 md.json

# reload again

[root@www ~]#

systemctl reload httpd

# if all checks passed, valid certificate is gotten

[root@www ~]#

ll /etc/httpd/md/domains/rx-9.srv.world

total 24
-rw-------. 1 root root 4895 Apr 28 09:08 job.json
-rw-------. 1 root root  654 Apr 28 09:08 md.json
-rw-------. 1 root root 1704 Apr 28 09:08 privkey.pem
-rw-------. 1 root root 5587 Apr 28 09:08 pubcert.pem

[5]	It's possible to confirm expiration date and others of certificate with [openssl] command like follows. Or it's possible to see them to access to the URL of [md-status] you set on [2].

[root@www ~]#

openssl s_client -connect rx-9.srv.world:443 | openssl x509 -noout -startdate -enddate

depth=2 C = US, O = Internet Security Research Group, CN = ISRG Root X1
verify return:1
depth=1 C = US, O = Let's Encrypt, CN = R3
verify return:1
depth=0 CN = rx-9.srv.world
verify return:1
notBefore=Apr 27 23:07:46 2023 GMT
notAfter=Jul 26 23:07:45 2023 GMT

Matched Content