How To Install Mod_auth_kerb
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And the authentication mechanism to mod_auth_kerb. I am running on Oracle Linux 6 with Tomcat 6.0.35 and Apache 2.2. I have performed the following steps to get to this point above these are: $ yum install krb5-devel $ yum install krb5-libs $ yum install krb5-workstation $ cd /etc $ vi krb5.conf. I add the following to the krb5.conf file [logging]. 31.4 Installing, Activating, and Configuring Modules. Mod_auth_kerb provides Kerberos authentication to the Apache Web server. Install and activate a module from source code with the following commands: cd /path/to/module/source; apxs2 -cia mod_foo.c. I'm currently trying to configure Kerberos authentication in Apache. All manuals I found say that I need to install modauthkerb but this package is not available in both Fedora 27 and Fedora28. I tried searching for the package with the following command but I'm unable to find the correct package: dnf provides */mod_auth_kerb.so. Jun 16, 2010 The first part, SSO authentication, is handled via mod_auth_kerb; the second part, authorization to use particular resources, is handled via mod_authnz_ldap. Mod_authnz_ldap is bundled with Apache 2.2. We will have to build a new version of mod_auth_kerb from source to get a feature that we need to make this work. Download and install the mod_auth_kerb Apache module. Add the following directives to the Apache configuration, either in httpd.conf or in the conf.d directory in its own file (my installation of mod_auth_kerb created an auth_kerb.conf in conf.d ).
The process of setting up HTTP SSO with Kerberos can be broken down to the below steps:
1.Generating a ‘keytab’ file for the Apache Host using the ktpass.exe tool.
The ktpass command should be run with a Domain admin
The password for the “-pass” argument needs to correspond to Win 2012 standards.
A example command would be:
Apache2-mod_auth_kerb from Apache:Modules project Select Your Operating System.
ktpass -princ HTTP/uriahl.com@URIAHL.COM -mapuser apache -crypto All -DesOnly -pass P@ssw0rd -ptype KRB5_NT_PRINCIPAL -out apache.keytab
uriahl.com – fqdn of the Apache server
URIAHL.COM – The Kerberos REALM for which this keytab is generated for
apache – the Active Directory user to map the keytab to
Apache.keytab – the keytab filename
2.Configuring the HTTPD VirtualHost to use the auth_kerb_module and it’s corresponding directives. HTTPD doesn’t usually come pre-installed with this module;
you can go ahead and install it with:
Debian-based installations:
apt-get install libapache2-mod-auth-kerb
Centos/RHEL:
yum install mod_auth_kerb
Burkert 1067 side control manual. The installation will prompt you for several configuration options. Enter your Kerberos Realm name, the KDC host (“Kerberos servers for your realm” – the hostname of the machine that hosts your KDC), and the administrative servers hostname (You may use the same value of the previous field, depending on your setup).
*A Kerberos Realm is by convention your AD domain, with capital letters. For example, if my AD domain is domain.uriahl.com, my realm should be named DOMAIN.URIAHL.COM
At this point be sure to copy over your keytab file generated in step #1 to the apache machine, and secure it so that only the OS user who’s running apache has access to it.
An example for a full SSL-equipped Apache VirtualHost config that proxies Artifactory and uses Kerberos authentication with the “/artifactory” location can look like this (the “Krb5KeyTab” directive points to the location of the keytab file):
Listen 443
<VirtualHost *:443>
ServerAdmin uriahl@uriahl.com
ServerName apache.server.com
SSLEngine on
SSLCertificateFile /etc/ssl/certs/cert.crt
SSLCertificateKeyFile /etc/ssl/certs/cert.key
SSLProxyEngine on
ErrorLog '/private/var/log/apache2/uriahl.com-error_log'
CustomLog '/private/var/log/apache2/uriahl.com-access_log' common
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<Location /artifactory>
AuthType Kerberos
AuthName 'Kerberos Login'
KrbMethodNegotiate On
KrbMethodK5Passwd On
KrbAuthRealms DOMAIN.URIAHL.COM
KrbLocalUserMapping On
Krb5KeyTab /usr/local/apache2/keytab/apache.keytab
require valid-user
RewriteEngine On
RewriteCond %{REMOTE_USER} (.+)
RewriteRule . – [E=RU:%1]
RequestHeader set REMOTE_USER %{RU}e
</Location>
RewriteEngine on

RewriteCond %{SERVER_PORT} (.*)
RewriteRule (.*) – [E=my_server_port:%1]
## NOTE: The 'REQUEST_SCHEME' Header is supported only from apache version 2.4 and above
RewriteCond %{REQUEST_SCHEME} (.*)
RewriteRule (.*) – [E=my_scheme:%1]
RewriteCond %{HTTP_HOST} (.*)
RewriteRule (.*) – [E=my_custom_host:%1]
RewriteRule ^/$ /artifactory/webapp/ [R,L]
Autocad 2015 crack product key and serial number. RewriteRule ^/artifactory(/)?$ /artifactory/webapp/ [R,L]
RewriteRule ^/artifactory/webapp$ /artifactory/webapp/ [R,L]
RequestHeader set Host %{my_custom_host}e
RequestHeader set X-Forwarded-Port %{my_server_port}e
## NOTE: {my_scheme} requires a module which is supported only from apache version 2.4 and above
RequestHeader set X-Forwarded-Proto %{my_scheme}e
RequestHeader set X-Artifactory-Override-Base-Url %{my_scheme}e://artifactory_host:8081/artifactory
# RequestHeader set REMOTE_USER %{REMOTE_USER}e
ProxyPassReverseCookiePath /artifactory /artifactory
ProxyRequests off
ProxyPreserveHost on
ProxyPass /artifactory/ http://artifactory_host:8081/artifactory/
ProxyPassReverse /artifactory/ http://artifactory_host:8081/artifactory/
</VirtualHost>
*In this example I have a root httpd.conf file which loads the mod_auth_kerb module by specifying:
LoadModule auth_kerb_module /usr/lib/apache2/modules/mod_auth_kerb.so
*In addition to the mod_auth_kerb module, the below modules are required for the above configuration to work:
mod_headers
mod_proxy
mod_ssl
mod_rewrite
mod_prox_http
3. Configuring Artifactory to accept HTTP SSO authentication based on the REMOTE_USER header.

That's it!
Appendix with useful links:
mod_auth_kerb documentation – The official site of the mod_auth_kerb module
Apache and mod_auth_kerb
Debugging common failures:
Error #1
[Mon Jun 27 13:54:42.271303 2016] [auth_kerb:error] [pid 2301:tid 140157256722176] [client 192.168.99.1:54417] krb5_get_init_creds_password() failed: KDC has no support for encryption type
It might mean that Active Directory is not configured to support the encryption algorithm you used when generating the keytab file. On our example, we used the “-All” value which means that the generated keytab will support all algorithms, but you may want to tweak this to use just the strongest encryption types. You can refer to this link which has step-by-step instructions on enabling the various encryption types supported by your AD domain. Also see this link.
Error #2
[Mon Jun 27 12:25:10.517382 2016] [auth_kerb:error] [pid 1375:tid 140157248329472] [client 192.168.99.1:52174] failed to verify krb5 credentials: Server not found in Kerberos database
Apache error log shows “Server not found in Kerberos database':
http://serverfault.com/questions/547110/kerberos-signle-sign-on-for-website
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Description
mod_auth_kerb - Kerberos authentication module for HTTP
Property | Value |
---|---|
Distribution | CentOS 7 |
Repository | CentOS x86_64 |
Package filename | mod_auth_kerb-5.4-28.el7.x86_64.rpm |
Package name | mod_auth_kerb |
Package version | 5.4 |
Package release | 28.el7 |
Package architecture | x86_64 |
Package type | rpm |
Category | System Environment/Daemons |
Homepage | http://modauthkerb.sourceforge.net/ |
License | BSD and MIT and ASL 2.0 |
Maintainer | - |
Download size | 32.49 KB |
Installed size | 65.82 KB |
Alternatives
Package | Version | Architecture | Repository |
---|---|---|---|
mod_auth_kerb | - | - | - |
Requires
Name | Value |
---|---|
httpd | - |
httpd-mmn | = 20120211x8664 |
libc.so.6(GLIBC_2.8)(64bit) | - |
libcom_err.so.2()(64bit) | - |
libgssapi_krb5.so.2()(64bit) | - |
libgssapi_krb5.so.2(gssapi_krb5_2_MIT)(64bit) | - |
libk5crypto.so.3()(64bit) | - |
libkrb5.so.3()(64bit) | - |
libkrb5.so.3(krb5_3_MIT)(64bit) | - |
libresolv.so.2()(64bit) | - |
rtld(GNU_HASH) | - |
Provides
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Name | Value |
---|---|
mod_auth_kerb | = 5.4-28.el7 |
mod_auth_kerb(x86-64) | = 5.4-28.el7 |
Download
Type | URL |
---|---|
Mirror | mirror.centos.org |
Binary Package | mod_auth_kerb-5.4-28.el7.x86_64.rpm |
Source Package | mod_auth_kerb-5.4-28.el7.src.rpm |
Install Howto
Install mod_auth_kerb rpm package:
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Files
Path |
---|
/etc/httpd/conf.modules.d/10-auth_kerb.conf |
/run/httpd/krbcache/ |
/usr/lib/tmpfiles.d/httpd-krbcache.conf |
/usr/lib64/httpd/modules/mod_auth_kerb.so |
/usr/share/doc/mod_auth_kerb-5.4/LICENSE |
/usr/share/doc/mod_auth_kerb-5.4/LICENSE.ASL |
/usr/share/doc/mod_auth_kerb-5.4/README |
/usr/share/doc/mod_auth_kerb-5.4/example.conf |
Changelog
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Package | Description |
---|---|
mod_auth_mellon-0.14.0-2.el7.x86_64.rpm | A SAML 2.0 authentication module for the Apache Httpd Server |
mod_auth_mellon-diagnostics-0.14.0-2.el7.x86_64.rpm | Build of mod_auth_mellon with diagnostic logging |
mod_auth_openidc-1.8.8-3.el7.x86_64.rpm | OpenID Connect auth module for Apache HTTP Server |
mod_authnz_pam-1.1.0-1.el7.x86_64.rpm | PAM authorization checker and PAM Basic Authentication provider |
mod_dav_svn-1.7.14-14.el7.x86_64.rpm | Apache httpd module for Subversion server |
mod_fcgid-2.3.9-4.el7_4.1.x86_64.rpm | FastCGI interface module for Apache 2 |
mod_intercept_form_submit-1.1.0-1.el7.x86_64.rpm | Apache module to intercept login form submission and run PAM authentication |
mod_ldap-2.4.6-88.el7.centos.x86_64.rpm | LDAP authentication modules for the Apache HTTP Server |
mod_lookup_identity-1.0.0-1.el7.x86_64.rpm | Apache module to retrieve additional information about the authenticated user |
mod_nss-1.0.14-12.el7.x86_64.rpm | SSL/TLS module for the Apache HTTP server |
mod_proxy_html-2.4.6-88.el7.centos.x86_64.rpm | HTML and XML content filters for the Apache HTTP Server |
mod_revocator-1.0.3-21.el7.x86_64.rpm | CRL retrieval module for the Apache HTTP server |
mod_security-2.9.2-1.el7.x86_64.rpm | Security module for the Apache HTTP Server |
mod_security-mlogc-2.9.2-1.el7.x86_64.rpm | ModSecurity Audit Log Collector |
mod_security_crs-2.2.9-1.el7.noarch.rpm | ModSecurity Rules |