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CRIPTOGRAFIE ȘI SECURITATE CIBERNETICĂ

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6. Securitatea comunicațiilor web

Apache httpd : Basic Auth + LDAP

Configure [mod_ldap] to use LDAP directory users on httpd Basic authentication.
On this example, it uses Active Directory like following environment for it.

Domain Server	: Windows Server 2019
Domain Name	: srv.world
Hostname	: fd3s.srv.world
NetBIOS Name	: FD3S01
Realm	: SRV.WORLD

[1]

Username and password are sent with plain text on Basic Authentication,
so Use secure connection with SSL/TLS setting, refer to here.

[2]

Create a user on Active Directory for binding Active Directory from httpd.
On this example, it creates [ldapuser], it's OK to grant [Domain Users] rights only for it.

[3]

Install [mod_ldap].

[root@www ~]#

dnf -y install mod_ldap

[4]	Configure Basic authentication + LDAP. For example, set Basic Authentication to the directory [/var/www/html/auth-ldap].

[root@www ~]#

vi /etc/httpd/conf.d/authnz_ldap.conf

# create new
# on example below, it limits the range to search the directory only [LDAPUsers] OU
# so only users under the [LDAPUsers] OU can authenticate with this setting
# for [AuthLDAPBindDN] and [AuthLDAPBindPassword], specify the AD user for binding

<Directory "/var/www/html/auth-ldap">
    SSLRequireSSL
    AuthType Basic
    AuthName "LDAP Authentication"
    AuthBasicProvider ldap
    AuthLDAPURL "ldap://fd3s.srv.world:389/ou=LDAPUsers,dc=srv,dc=world?sAMAccountName?sub?(objectClass=*)"
    AuthLDAPBindDN ldapuser@srv.world
    AuthLDAPBindPassword Password
    Require valid-user
</Directory>

[root@www ~]#

chgrp apache /etc/httpd/conf.d/authnz_ldap.conf

[root@www ~]#

chmod 640 /etc/httpd/conf.d/authnz_ldap.conf

[root@www ~]#

systemctl restart httpd

# create a test page

[root@www ~]#

mkdir /var/www/html/auth-ldap

[root@www ~]#

vi /var/www/html/auth-ldap/index.html

<html>
<body>
<div style="width: 100%; font-size: 40px; font-weight: bold; text-align: center;">
Test Page for LDAP Authentication
</div>
</body>
</html>

[5]	If SELinux is enabled, change policy like follows.

[root@www ~]#

setsebool -P httpd_can_network_connect on

[root@www ~]#

setsebool -P httpd_can_connect_ldap on

[6]	Access to the test page from any client computer with web browser. Then authentication is required as settings, answer with any AD user.

[7]	That's OK if authentication is successfully passed and test page is displayed normally.

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