ACRONIS Backup & Recovery 10 Advanced Server User's Guide download pdf (Page 80)

2.13.7.4. Privileges for remote connection in Linux

Remote connections to a machine running Linux—including those performed by the root user—are

established according to authentication policies, which are set up by using Pluggable Authentication

Modules for Linux, known as Linux-PAM.

For the authentication policies to work, we recommend installing the latest version of Linux-PAM for

your Linux distribution. The latest stable source code of Linux-PAM is available at Linux-PAM source

code Web page.

Remote connection as the root user

Remote connections by the root user are established according to the Acronisagent authentication

policy, which is automatically set up during the installation of Acronis Backup & Recovery 10 Agent

for Linux, by creating the file /etc/pam.d/Acronisagent with the following content:

#%PAM-1.0

auth required pam_unix.so

auth required pam_rootok.so

account required pam_unix.so

Remote connection as a non-root user

Since accessing the system as the root user should be restricted, the root user can create an

authentication policy to enable remote management under non-root credentials.

The following are two examples of such policies.

Note: As a result, the specified non-root users will be able to connect to the machine remotely as if they were

root users. A security best practice is to make sure that the user accounts are hard to compromise—for example,

by requiring that they have strong passwords.

Example 1

This authentication policy uses the pam_succeed_if module and works with Linux distributions with

kernel version 2.6 or later. For an authentication policy which works with kernel version 2.4, see the

next example.

Perform the following steps as the root user:

1. Create the Acronis_Trusted group account, by running the following command:

groupadd Acronis_Trusted

2. Add the names of the non-root users, whom you want to allow to connect to the machine

remotely, to the Acronis_Trusted group. For example, to add the existing user user_a to the

group, run the following command:

usermod -G Acronis_Trusted user_a

3. Create the file /etc/pam.d/Acronisagent-trusted with the following content:

#%PAM-1.0

auth required pam_unix.so

auth required pam_succeed_if.so user ingroup Acronis_Trusted

account required pam_unix.so

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ACRONIS Backup & Recovery 10 Advanced Server User's Guide Page 80