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CLI-based Configuration Guide - Security

AR500, AR510, and AR530 V200R007

This document describes the configurations of Security, including AAA, DAA,NAC, BRAS Access, ACL, Firewall, Deep Security Defense, Local Attack Defense;Attack Defense, Traffic Suppression, ARP Security, Port Security, DHCP Snooping, IPSG, URPF, PKI, SSL, HTTPS, Keychain, separating the management plane from the service plane, security risks.
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Configuring a Client SSL Policy

Configuring a Client SSL Policy

When the device functions as an SSL client, you need to configure a client SSL policy.

Prerequisites

The PKI domain has been configured.

Context

The SSL protocol uses data encryption, identity authentication, and message integrity check to ensure security of TCP-based application layer protocols. A client SSL policy can be applied to application layer protocols to provide secure connections.

Figure 16-3  Router functions as an SSL client

As shown in Figure 16-3, the Figure 16-3 functions as an SSL client and has a client SSL policy configured. During an SSL handshake, the Router uses the SSL parameters in the client SSL policy to negotiate session parameters with the SSL server. After the handshake is complete, the Router establishes a session with the server.

When functioning as an SSL client, the Router does not allow SSL servers to authenticate it, but it can authenticate SSL servers. When the Router functions as an SSL client, enable it to authenticate servers to ensure secure communication.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    ssl policy policy-name type client

    A client SSL policy is created, and the client SSL policy view is displayed.

  3. Run:

    server-verify enable

    SSL server authentication is enabled.

    By default, SSL server authentication is enabled in a client SSL policy.

  4. Run:

    pki-realm realm-name

    A PKI domain is specified for the client SSL policy.

    By default, no PKI domain is specified for a client SSL policy on the Router.

    NOTE:

    The Router obtains a CA certificate chain from CAs in the specified PKI domain. The Router authenticates an SSL server by checking the server certificate and CA certificates against the CA certificate chain.

  5. (Optional) Run:

    version { ssl3.0 | tls1.0 | tls1.1 } *

    The SSL protocol version is specified.

    By default, a client SSL policy uses Transport Layer Security (TLS) version 1.0.

    NOTE:

    Ensure that the specified SSL protocol version is supported by the SSL server. Before performing this step, check the SSL protocol versions that the SSL server supports.

    SSL3.0 has potential security risks, and will be interdicted to use soon. TLS1.1 or a TLS higher version is recommended.

  6. (Optional) Run:

    prefer-ciphersuite { rsa_3des_cbc_sha | rsa_aes_128_cbc_sha | rsa_des_cbc_sha } *

    A cipher suite is specified.

    By default, a client SSL policy supports all the cipher suites: rsa_aes_128_cbc_sha.

    NOTE:

    Ensure that the specified cipher suite is supported by the SSL server. Before performing this step, check the cipher suites that the SSL server supports.

  7. (Optional) Configure the SSL renegotiation function.

    Disabling the renegotiation function on the device can protect the device against renegotiation attacks, but will interrupt services. Therefore, you can keep the renegotiation function enabled, and set the SSL renegotiation rate to minimize the impact of renegotiation attacks on services. Choose either of the following tasks:

    • Disable renegotiation.

      Run the undo renegotiation enable command to disable SSL renegotiation.

      By default, SSL renegotiation is enabled.

    • Set the renegotiation rate.
      1. Run the quit command to return to the system view.
      2. Run the ssl renegotiation-rate rate command to set the SSL renegotiation rate.

        By default, the SSL renegotiation is performed once per second. You can set the rate according to the CPU capability of the device.

        This configuration applies to all SSL policies.

Checking the Configuration

Run the display ssl policy [ policy-name ] command to view the configuration of the SSL policy.

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Updated: 2019-05-25

Document ID: EDOC1000097287

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