Integrate a RHEL 7.x Virtual Machine with Active Directory for Smart Card Redirection

To support smart card redirection on RHEL 7.x desktops, integrate the base virtual machine (VM) with your Active Directory (AD) domain using the Samba and Winbind solutions.

Use the following procedure to integrate a RHEL 7.x VM with your AD domain for smart card redirection.

Some examples in the procedure use placeholder values to represent entities in your network configuration, such as the DNS name of your AD domain. Replace the placeholder values with information specific to your configuration, as described in the following table.


Placeholder Value	Description
dns_IP_ADDRESS	IP address of your DNS name server
mydomain.com	DNS name of your AD domain
MYDOMAIN.COM	DNS name of your AD domain, in all capital letters
MYDOMAIN	DNS name of the workgroup or NT domain that includes your Samba server, in all capital letters
ads-hostname	Host name of your AD server

Note: Smart card redirection is supported on desktops running RHEL 7.2 or later.

Procedure

On the RHEL 7.x VM, install the required packages.

# yum install nscd samba-winbind krb5-workstation pam_krb5 samba-winbind-clients authconfig-gtk

Edit the network settings for your system connection. Open the NetworkManager control panel and navigate to the IPv4 Settings for your system connection. For IPv4 Method, select Automatic (DHCP) . In the DNS text box, enter the IP address of your DNS name server. Then click Apply.
Run the following command and verify that it returns the Fully Qualified Domain Name (FQDN) of the RHEL 7.x VM.
```
# hostname -f
```
Edit the /etc/resolv.conf configuration file, as shown in the following example.
```
search mydomain.com
nameserver dns_IP_ADDRESS
```
Disable Security-Enhanced Linux (SELinux) on the RHEL 7.x VM. Edit the /etc/selinux/config configuration file, as shown in the following example.
```
SELINUX=disabled
```

Edit the /etc/krb5.conf configuration file, as shown in the following example.

[libdefaults]
      dns_lookup_realm = false
      ticket_lifetime = 24h
      renew_lifetime = 7d
      forwardable = true
      rdns = false
      default_realm = MYDOMAIN.COM
      default_ccache_name = KEYRING:persistent:%{uid}

[realms]
      MYDOMAIN.COM = {
            kdc = ads-hostname
            admin_server = ads-hostname
            default_domain = ads-hostname
      }

[domain_realm]
      .mydomain.com = MYDOMAIN.COM
      mydomain.com = MYDOMAIN.COM

Edit the /etc/samba/smb.conf configuration file, as shown in the following example.

[global]
      workgroup = MYDOMAIN  
      password server = ads-hostname
      realm = MYDOMAIN.COM
      security = ads
      idmap config * : range = 16777216-33554431
      template homedir =/home/MYDOMAIN/%U
      template shell = /bin/bash 
      kerberos method = secrets and keytab
      winbind use default domain = true
      winbind offline logon = false 
      winbind refresh tickets = true
 
      passdb backend = tdbsam

Open the authconfig-gtk tool and configure settings as follows.
1. Select the Identity & Authentication tab. For User Account Database, select Winbind.
2. Select the Advanced Options tab, and select the Create home directories on the first login check box.
3. Select the Identity & Authentication tab and then click Join Domain. At the alert asking you to save changes, click Save.
4. When prompted, enter the user name and password of the domain administrator, and click OK.
The RHEL 7.x VM is joined to the AD domain.
Set up ticket caching on PAM Winbind. Edit the /etc/security/pam_winbind.conf configuration file so that it includes the lines shown in the following example.
```
[global]

# authenticate using kerberos
;krb5_auth = yes 

# create homedirectory on the fly
;mkhomedir = yes  
```
Restart the Winbind service.
```
# sudo service winbind restart
```
To verify the AD join, run the following commands and ensure that they return the correct output.
- net ads testjoin
- net ads info
Restart the RHEL 7.x VM and log back in.

What to do next

Set Up Smart Card Redirection on a RHEL 7.x Virtual Machine