Help Center/ Web Application Firewall/ Best Practices/ Using LTS to Analyze WAF Logs/ Using LTS to Configure Block Alarms for WAF Rules
Updated on 2024-11-05 GMT+08:00

Using LTS to Configure Block Alarms for WAF Rules

Application Scenarios

After you authorize WAF to access Log Tank Service (LTS), you can use the attack logs recorded by LTS for quick and efficient real-time analysis, device O&M management, and analysis of service trends.

This topic walks you through how to enable LTS quick analysis for WAF attack logs and configure alarm rules to analyze WAF attack logs and generate alarms. In this way, you can gain insight into the protection status of your workloads in WAF in real time and make informed decisions.

Resource and Cost Planning

Table 1 Resources and costs

Resource

Description

Monthly Fee

Log Tank Service (LTS)

  • Billing mode: Pay-per-use
  • New log volume: 10 GB/day
  • Log retention period: 7 days

For details about billing rules, see Billing Description.

Simple Message Notification (SMN)

SMN is billed based on downstream Internet traffic and notification messages.

The fee composition in different scenarios is as follows:

  • SMS: number of SMS notifications
  • Email: Email notifications + Downstream Internet traffic
  • HTTP or HTTPS: HTTP or HTTPS notifications + Downstream Internet traffic

For details about billing rules, see Billing Description.

Web Application Firewall (WAF)

Cloud - Standard edition

  • Billing mode: Yearly/Monthly
  • Domain name quota: 10, including a maximum of one top-level domain name
  • QPS quota: 2,000 QPS
  • Peak bandwidth: 100 Mbit/s inside the cloud and 30 Mbit/s outside the cloud

For details about pricing rules, see Billing Description.

Step 1: Buy the Standard Edition Cloud WAF

The following describes how to buy the standard edition cloud WAF.

  1. Log in to Huawei Cloud management console.
  2. On the management console page, choose Security & Compliance > Web Application Firewall.
  3. In the upper right corner of the page, click Buy WAF. On the purchase page displayed, select Cloud Mode for WAF Mode.

    • Region: Select the region nearest to your services WAF will protect.
    • Edition: Select Standard.
    • Expansion Package and Required Duration: Set them based on site requirements.

  4. Confirm the product details and click Buy Now in the lower right corner of the page.
  5. Check the order details and read the WAF Disclaimer. Then, select the box and click Pay Now.
  6. On the payment page, select a payment method and pay for your order.

Step 2: Add Website Information to WAF

The following example shows how to add a website information to WAF in cloud CNAME access mode.

  1. In the navigation pane on the left, choose Website Settings.
  2. In the upper left corner of the website list, click Add Website.
  3. Select Cloud - CNAME and click Configure Now.
  4. Configure website information as prompted.

    Figure 1 Configuring basic information
    Table 2 Key parameters

    Parameter

    Description

    Example Value

    Domain Name

    Domain name you want to add to WAF for protection.

    • The domain name has an ICP license.
    • You can enter a single domain name (for example, top-level domain name example.com or level-2 domain name www.example.com) or a wildcard domain name (*.example.com).

    www.example.com

    Protected Port

    The port over which the website traffic goes

    Standard ports

    Server Configuration

    Web server address settings. You need to configure the client protocol, server protocol, server weights, server address, and server port.

    • Client Protocol: protocol used by a client to access a server. The options are HTTP and HTTPS.
    • Server Protocol: protocol used by WAF to forward client requests. The options are HTTP and HTTPS.
    • Server Address: public IP address (generally corresponding to the A record of the domain name configured on the DNS) or domain name (generally corresponding to the CNAME record of the domain name configured on the DNS) of the web server that a client accesses.
    • Server Port: service port over which the WAF instance forwards client requests to the origin server.
    • Weight: Requests are distributed across backend origin servers based on the load balancing algorithm you select and the weight you assign to each server.

    Client Protocol: Select HTTP.

    Server Protocol: HTTP

    Server Address: IPv4 XXX.XXX.1.1

    Server Port: 80

    Use Layer-7 Proxy

    You need to configure whether you deploy layer-7 proxies in front of WAF.

    Set this parameter based on your website deployment.

    Yes

  5. Click Next. Then, whitelist WAF back-to-source IP address, test WAF, and modify DNS records as prompted.

    Figure 2 Domain name added to WAF

Step 3: Enable LTS for Protection Logs

  1. Log in to the management console.
  2. Click in the upper left corner of the management console and select a region or project.
  3. Click in the upper left corner and choose Web Application Firewall under Security & Compliance.
  4. In the navigation pane on the left, choose Events.
  5. Click the Log Settings tab, enable LTS (), and select a log group and log stream. Table 3 describes the parameters.

    Figure 3 Log settings
    Table 3 Log configuration

    Parameter

    Description

    Example Value

    Log Group

    Select a log group or click View Log Group to go to the LTS console and create a log group.

    lts-group-waf

    Attack Log

    Select a log stream or click View Log Stream to go to the LTS console and create a log stream.

    An attack log includes information about event type, protective action, and attack source IP address of each attack.

    lts-topic-waf-attack

    Access Log

    Select a log stream or click View Log Stream to go to the LTS console and create a log stream.

    An access log includes key information about access time, client IP address, and resource URL of each HTTP access requests.

    lts-topic-waf-access

  6. Click OK.

    You can view WAF protection event logs on the LTS console.

Step 4: Quickly Analyze Block Logs Generated by Protection Rules

  1. Click in the upper left corner of the page and choose Management & Governance > Log Tank Service.
  2. In the log group list, expand the WAF log group and choose log stream attack.
  3. On the log stream details page, click in the upper right corner. On the page displayed, click the Cloud Structured Parsing tab.
  4. Select JSON for log structuring. Then, click Select from existing events and select a log in the dialog box displayed on the right.
  5. Click Intelligent Extraction to find the fields you want to analyze quickly. Enable these fields in the Quick Analysis column. After this, you can collect and analyze periodic logs.

    Figure 4 Log extraction field

  6. Find the category field, click in the Alias column, change the field name, and click to save the settings.

    There is already a built-in category field in the system so you need to change the alias name of the category field, or your settings cannot be saved.

  7. In the lower right corner of the list, click Save. LTS quickly analyzes and collects statistics on logs in the specified period.
  8. In the navigation pane, choose Visualization. On the right pane, select a log query time range, enter an SQL statement in the search box, and click Query.

    You can group logs by rule and URI. Enter the following SQL statement in the search box to query logs of a specified rule:

    select rule, uri, count(*) as cnt where action = 'block' group by rule, uri order by cnt desc

Step 5: Configure Alarm Rules

  1. Click in the upper left corner of the page and choose Management & Governance > Log Tank Service.
  2. In the navigation pane on the left, choose Alarms > Alarm Rules.
  3. Click Create. In the dialog box displayed on the right, specify related parameters. Table 4 describes the parameters.

    Figure 5 Create Alarm Rule
    Table 4 Parameter description

    Parameter

    Description

    Example Value

    Rule Name

    Name of the custom rule

    WAF alarms

    Statistics

    Select By SQL.

    By SQL

    Charts

    Click Configure from Scratch.

    • Specify Log Group Name and Log Stream Name.
    • Query Time Range: Time range for log statistics
    • Query Statement: Enter the SQL statement configured in Step 8, for example, select rule,uri,count(*) as cnt where action='block' group by rule,uri order by cnt desc.

    None

    Query Frequency

    Frequency which triggers alarms Generally, a fixed custom interval of 5 minutes is selected.

    Custom interval

    5

    minutes

    Conditional Expression

    Alarm threshold

    cnt>5

    Alarm Severity

    Select an alarm severity based on the blocking emergency of the rule. The options are critical, major, minor, and info.

    Major

    Send Notification

    Select Yes.

    Yes

    SMN Topic

    Select a topic from the drop-down list or create a topic.

    If there are no topics, click View Topic and perform the following steps to create a topic:
    1. Create a topic. For details, see Creating a Topic.
    2. Add one or more subscriptions to the topic. You will need to provide a phone number, email address, function, platform application endpoint, DMS endpoint, or HTTP/HTTPS endpoint for receiving alarm notifications. For details, see Adding a Subscription.
    3. Confirm the subscription. After the subscription is added, confirm the subscription.

    For details about topics and subscriptions, see the Simple Message Notification User Guide.

    None

    Time Zone/Language

    You can modify the language and time zone for receiving messages.

    None

    Message Templates

    Select an existing template from the drop-down list box or click Create Message Template and create a template.

    sql_template

  4. Confirm all parameters and click OK. The alarm rule is configured. When the alarm rule is triggered, you will receive an alarm email or SMS message.