Kaspersky Unified Monitoring and Analysis Platform

Diode type

The diode type is used to transmit events using a data diode.

Available settings:

Basic settings tab:

• Name (required)—a unique name for this type of resource. Must contain from 1 to 128 Unicode characters.
• Tenant (required)—name of the tenant that owns the resource.
• Disabled toggle switch—used if you do not need to send events to a destination. By default, sending events is enabled.
• Type (required) – destination type, diode.
• Data diode source directory (required)—the directory from which the data diode transfers events. The path can contain up to 255 Unicode characters.

  Limitations when using prefixes in paths on Windows servers

  On Windows servers, absolute paths to directories must be specified. Directories with names matching the following regular expressions cannot be used:

  • ^[a-zA-Z]:\\Program Files
  • ^[a-zA-Z]:\\Program Files \(x86\)
  • ^[a-zA-Z]:\\Windows
  • ^[a-zA-Z]:\\Program Files\\Kaspersky Lab\\KUMA

  Limitations when using prefixes in paths on Linux servers

  Prefixes that cannot be used when specifying paths to files:

  • /*
  • /bin
  • /boot
  • /dev
  • /etc
  • /home
  • /lib
  • /lib64
  • /proc
  • /root
  • /run
  • /sys
  • /tmp
  • /usr/*
  • /usr/bin/
  • /usr/local/*
  • /usr/local/sbin/
  • /usr/local/bin/
  • /usr/sbin/
  • /usr/lib/
  • /usr/lib64/
  • /var/*
  • /var/lib/
  • /var/run/
  • /opt/kaspersky/kuma/

  Files are available at the following paths:

  • /opt/kaspersky/kuma/clickhouse/logs/
  • /opt/kaspersky/kuma/mongodb/log/
  • /opt/kaspersky/kuma/victoria-metrics/log/

• Temporary directory—directory in which events are prepared for transmission to the data diode.

  Events are collected in a file when a timeout (10 seconds by default) or a buffer overflow occurs. The prepared file is moved to the directory specified in the Data diode source directory field. The checksum (SHA-256) of the file contents is used as the name of the file containing events.

  The temporary directory must be different from the data diode source directory.

• Description—up to 256 Unicode characters describing the resource.

Advanced settings tab:

• Compression—you can use Snappy compression. By default, compression is disabled.

  This setting must match for the connector and destination resources used to relay events from an isolated network segment via the data diode.

• Buffer size is used to set the size of the buffer. Default size is 64 MB. It cannot exceed 64 MB.
• Timeout—field in which you can specify the interval (in seconds) at which the data is moved from the temporary directory to the directory for the data diode. The default value is 10.
• Delimiter is used to specify the character delimiting the events. By default, \n is used.

  This setting must match for the connector and destination resources used to relay events from an isolated network segment via the data diode.

• Buffer flush interval—this field is used to set the time interval (in seconds) at which the data is sent to the destination. The default value is 100.
• Workers—this field is used to set the number of services processing the queue. By default, this value is equal to the number of vCPUs of the KUMA Core server.
• Debug—a drop-down list where you can specify whether resource logging should be enabled. By default it is Disabled.
• The Disk buffer disabled drop-down list is used to enable or disable the use of a disk buffer. By default, the disk buffer is disabled.
• In the Filter section, you can specify the conditions to define events that will be processed by this resource. You can select an existing filter resource from the drop-down list, or select Create new to create a new filter.

  Creating a filter in resources

  1. In the Filter drop-down list, select Create new.
  2. If you want to keep the filter as a separate resource, select the Save filter check box.

     In this case, you will be able to use the created filter in various services.

     This check box is cleared by default.

  3. If you selected the Save filter check box, enter a name for the created filter resource in the Name field. The name must contain from 1 to 128 Unicode characters.
  4. In the Conditions settings block, specify the conditions that the events must meet:
     1. Click the Add condition button.
     2. In the Left operand and Right operand drop-down lists, specify the search parameters.

        Depending on the data source selected in the Right operand field, you may see fields of additional parameters that you need to use to define the value that will be passed to the filter. For example, when choosing active list you will need to specify the name of the active list, the entry key, and the entry key field.

     3. In the operator drop-down list, select the relevant operator.

        Filter operators

        • =—the left operand equals the right operand.
        • <—the left operand is less than the right operand.
        • <=—the left operand is less than or equal to the right operand.
        • >—the left operand is greater than the right operand.
        • >=—the left operand is greater than or equal to the right operand.
        • inSubnet—the left operand (IP address) is in the subnet of the right operand (subnet).
        • contains—the left operand contains values of the right operand.
        • startsWith—the left operand starts with one of the values of the right operand.
        • endsWith—the left operand ends with one of the values of the right operand.
        • match—the left operand matches the regular expression of the right operand. The RE2 regular expressions are used.
        • hasBit—checks whether the left operand (string or number) contains bits whose positions are listed in the right operand (in a constant or in a list).
        • hasVulnerability—checks whether the left operand contains an asset with the vulnerability and vulnerability severity specified in the right operand.
        • inActiveList—this operator has only one operand. Its values are selected in the Key fields field and are compared with the entries in the active list selected from the Active List drop-down list.
        • inDictionary—checks whether the specified dictionary contains an entry defined by the key composed with the concatenated values of the selected event fields.
        • inCategory—the asset in the left operand is assigned at least one of the asset categories of the right operand.
        • inActiveDirectoryGroup—the Active Directory account in the left operand belongs to one of the Active Directory groups in the right operand.
        • TIDetect—this operator is used to find events using CyberTrace Threat Intelligence (TI) data. This operator can be used only on events that have completed enrichment with data from CyberTrace Threat Intelligence. In other words, it can only be used in collectors at the destination selection stage and in correlators.

     4. If necessary, select the do not match case check box. When this check box is selected, the operator ignores the case of the values.

        The selection of this check box does not apply to the InSubnet, InActiveList, InCategory or InActiveDirectoryGroup operators.

        This check box is cleared by default.

     5. If you want to add a negative condition, select If not from the If drop-down list.
     6. You can add multiple conditions or a group of conditions.
  5. If you have added multiple conditions or groups of conditions, choose a search condition (and, or, not) by clicking the AND button.
  6. If you want to add existing filters that are selected from the Select filter drop-down list, click the Add filter button.

     You can view the nested filter settings by clicking the button.