Drastic drop in concurrent connections-paloaltonetworks-panos

Drastic drop in concurrent connections-paloaltonetworks-panos

Vendor: paloaltonetworks

OS: panos

Alert when a drop was detected in the number of concurrent connections.

Remediation Steps:
Review why this may be happening.

How does this work?
This alert uses the Palo Alto Networks API to retrieve the current utilization of the number of sessions allowed in total.

Why is this important?
Tracking the number of concurrent connections is helpful in understanding traffic patterns and load.

Without Indeni how would you find this?
To know what is the current utilization of sessions on a Palo Alto Networks firewall, the user will normally use the CLI. A script could be written to track this data on an ongoing basis.


Failed to fetch the data: https://bitbucket.org/indeni/indeni-knowledge/src/master/parsers/src/panw/panos/show-session-info/show-session-info.ind.yaml


package com.indeni.server.rules.library

  * Rule is cancelled at the moment since we rewrote Change detection algorithm
  * Rule should be re written with the new algorithm

import com.indeni.apidata.data.conditions.True
import com.indeni.ruleengine._
import com.indeni.ruleengine.expressions.conditions.ResultsFound
import com.indeni.ruleengine.expressions.core.{StatusTreeExpression, _}
import com.indeni.ruleengine.expressions.data.{SelectTagsExpression, SelectTimeSeriesExpression, TimeSeriesExpression}
import com.indeni.ruleengine.expressions.scope.ScopableExpression
import com.indeni.ruleengine.expressions.Expression
import com.indeni.ruleengine.expressions.tools.changePointAnalysis.DropDetectionExpression
import com.indeni.server.params._
import com.indeni.server.rules._
import com.indeni.server.rules.library.ConcurrentConnectionsDrasticChangeDownRule._
import com.indeni.server.rules.library.core.PerDeviceRule
import com.indeni.server.sensor.models.managementprocess.alerts.dto.AlertSeverity
import com.indeni.apidata.time.TimeSpan
  * Rule is cancelled at the moment since we rewrote Change detection algorithm
  * Rule should be re written with the new algorithm

case class ConcurrentConnectionsDrasticChangeDownRule() extends PerDeviceRule with RuleHelper {

  private val reviewedTimeframeParameter = new ParameterDefinition(REVIEWED_TIMEFRAME_PARAMETER_NAME,
    "Reviewed Timeframe",
    "The window of time we review to detect changes.",

  override val metadata: RuleMetadata = RuleMetadata.builder(NAME, "All Devices: Drastic drop in concurrent connections", "Alert when a drop was detected in the number of concurrent connections.", AlertSeverity.ERROR).configParameter(reviewedTimeframeParameter).build()

  override def expressionTree: StatusTreeExpression = {
    val numOfConnectionsTimeSeries = TimeSeriesExpression[Double]("concurrent-connections")
    val actualValue = numOfConnectionsTimeSeries.last
    val lastChange = DropDetectionExpression(numOfConnectionsTimeSeries).withLazy

      // Which objects to pull (normally, devices)
      SelectTagsExpression(context.metaDao, Set(DeviceKey), True),

          // The time-series we check the test condition against:
          SelectTimeSeriesExpression[Double](context.tsDao, Set("concurrent-connections"), historyLength = getParameterTimeSpanForRule(reviewedTimeframeParameter)),

          // The condition which, if true, we have an issue. Checked against the time-series we've collected

          // The Alert Item to add for this specific item
            scopableStringFormatExpression("A drop has been detected in the number of concurrent connections. %s.", new ScopableExpression[Any] {

              override protected def evalWithScope(time: Long, scope: Scope): String = s"Changed from ${lastChange.eval(time).head.before} to ${lastChange.eval(time).head.after}"
              override def args: Set[Expression[_]] = Set(lastChange)
            ConstantExpression("Review why this may be happening.")

object ConcurrentConnectionsDrasticChangeDownRule {

  /* --- Constants --- */

  private[library] val NAME = "concurrent_connections_drastic_change_down"

  private[library] val REVIEWED_TIMEFRAME_PARAMETER_NAME: String = "reviewed_timeframe"