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branko

MAR-28: Implemented additional tests for mail_server role:

- Deploy a number of tools on clients in order to test SMTP, IMAP, and Sieve
services.
- Added one more user to LDAP directory for testing group restrictions.
- Deploy CA certificate on all testing machines for TLS validation purposes.
- Use different custom-configured cipher for mail server ciphers.
- Fixed invalid postmaster address for parameters-optional host.
- Deploy configuration files for use with Imap-CLI on client test machines.
- Updated testing of SMTP server to include checks for users that do not belong
to mail group.
- Extended some SMTP-related tests to cover both test servers.
- Some small fixes in SMTP-related tests for expected output from commands.
- Implemented tests covering Dovecot (IMAP + Sieve) functionality.
- Implemented tests for running/enabled services.
- Implemented tests for ClamAV.
- Implemented tests for firewall and connectivity.
- Implemented tests for Postfix TLS configuration.
- TODO: Tests for Sieve TLS configuration have not been written yet due to
limitation of available tools.

# IPv4
domain ip {
    table filter {
        chain INPUT {
            policy DROP;
            interface lo ACCEPT;
            # Make sure not to allow flooding via ICMP ping packages by sending them
            # to flood chain before state module kicks in.
            proto icmp icmp-type echo-request jump flood;
            mod state state (ESTABLISHED RELATED) ACCEPT;
            # For TCP packages we perform floods checks after state module took care
            # of established and related connections.
            proto tcp tcp-flags (FIN SYN RST ACK) SYN jump flood;
            # Accept some common incoming connections.
            proto icmp icmp-type echo-request ACCEPT;
            proto tcp dport 22 ACCEPT;
        }

        # The flood chain is used for controlling the rate of the incoming connections.
        chain flood {
            # Rate-limit the ping requests.
            proto icmp icmp-type echo-request {
                mod hashlimit hashlimit {{ incoming_connection_limit }} hashlimit-burst {{ incoming_connection_limit_burst }}
                    hashlimit-mode srcip hashlimit-name icmp RETURN;
                DROP;
            }
            # Rate-limit the TCP connections.
            proto tcp tcp-flags (FIN SYN RST ACK) SYN {
                mod hashlimit hashlimit {{ incoming_connection_limit }} hashlimit-burst {{ incoming_connection_limit_burst }}
                    hashlimit-mode srcip hashlimit-name icmp RETURN;
                LOG;
                DROP;
            }
        }
    }
}

# IPv6, same as IPv4 config, with addition of a couple of ICMP packets.
domain ip6 {
    table filter {
        chain INPUT {
            policy DROP;
            interface lo ACCEPT;
            # Make sure not to allow flooding via ICMP ping packages by sending them
            # to flood chain before state module kicks in.
            proto icmp icmp-type echo-request jump flood;
            mod state state (ESTABLISHED RELATED) ACCEPT;
            # For TCP packages we perform floods checks after state module took care
            # of established and related connections.
            proto tcp tcp-flags (FIN SYN RST ACK) SYN jump flood;
            # ICMPv6 packets required for proper functioning of IPv6.
            proto icmp icmp-type router-advertisement ACCEPT;
            proto icmp icmp-type neighbor-solicitation ACCEPT;
            proto icmp icmp-type neighbor-advertisement ACCEPT;
            # Accept some common incoming connections.
            proto icmp icmp-type echo-request ACCEPT;
            proto tcp dport 22 ACCEPT;
        }

        # The flood chain is used for controlling the rate of the incoming connections.
        chain flood {
            # Rate-limit the ping requests.
            proto icmp icmp-type echo-request {
                mod hashlimit hashlimit {{ incoming_connection_limit }} hashlimit-burst {{ incoming_connection_limit_burst }}
                    hashlimit-mode srcip hashlimit-name icmp RETURN;
                DROP;
            }
            # Rate-limit the TCP connections.
            proto tcp tcp-flags (FIN SYN RST ACK) SYN {
                mod hashlimit hashlimit {{ incoming_connection_limit }} hashlimit-burst {{ incoming_connection_limit_burst }}
                    hashlimit-mode srcip hashlimit-name icmp RETURN;
                LOG;
                DROP;
            }
        }
    }
}