cloud-armor-demo/infra/cloud_armor.tf

# Copyright 2023 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

resource "google_compute_security_policy" "policy" {
  provider    = google-beta
  name        = "${local.application_name}-policy"
  description = "WAF preconfigured fules"

  rule {
    action      = "deny(403)"
    priority    = "1000"
    description = "Deny SQL injection"
    match {
      expr {
        expression = "evaluatePreconfiguredWaf('sqli-stable', {'sensitivity': 1})"
      }
    }
  }

  rule {
    action      = "deny(403)"
    priority    = "1010"
    description = "Deny Cross-site scripting"
    match {
      expr {
        expression = "evaluatePreconfiguredExpr('xss-stable')"
      }
    }
  }

  rule {
    action      = "deny(403)"
    priority    = "1020"
    description = "Deny Local file inclusion"
    match {
      expr {
        expression = "evaluatePreconfiguredExpr('lfi-stable')"
      }
    }
  }

  rule {
    action      = "deny(403)"
    priority    = "1030"
    description = "Deny Remote file inclusion"
    match {
      expr {
        expression = "evaluatePreconfiguredExpr('rfi-stable')"
      }
    }
  }

  rule {
    action      = "deny(403)"
    priority    = "1040"
    description = "Deny Remote code execution"
    match {
      expr {
        expression = "evaluatePreconfiguredExpr('rce-stable')"
      }
    }
  }

  rule {
    action      = "deny(403)"
    priority    = "1050"
    description = "Deny Method enforcement (public preview)"
    match {
      expr {
        expression = "evaluatePreconfiguredExpr('methodenforcement-stable')"
      }
    }
  }

  rule {
    action      = "deny(403)"
    priority    = "1060"
    description = "Deny Scanner detection"
    match {
      expr {
        expression = "evaluatePreconfiguredExpr('scannerdetection-stable')"
      }
    }
  }

  rule {
    action      = "deny(403)"
    priority    = "1070"
    description = "Deny Protocol attack"
    match {
      expr {
        expression = "evaluatePreconfiguredExpr('protocolattack-stable')"
      }
    }
  }

  rule {
    action      = "deny(403)"
    priority    = "1080"
    description = "Deny PHP injection attack"
    match {
      expr {
        expression = "evaluatePreconfiguredExpr('php-stable')"
      }
    }
  }

  rule {
    action      = "deny(403)"
    priority    = "1090"
    description = "Deny Session fixation attack"
    match {
      expr {
        expression = "evaluatePreconfiguredExpr('sessionfixation-stable')"
      }
    }
  }

  rule {
    action      = "deny(403)"
    priority    = "1100"
    description = "Deny Newly discovered vulnerabilities"
    match {
      expr {
        expression = "evaluatePreconfiguredExpr('cve-canary')"
      }
    }
  }

  # Rate based ban
  rule {
    action      = "rate_based_ban"
    priority    = "100000"
    description = "Rate based ban - 1000 reqs in 120s"

    match {
      versioned_expr = "SRC_IPS_V1"
      config {
        src_ip_ranges = ["*"]
      }
    }

    rate_limit_options {
      rate_limit_threshold {
        count        = 1000
        interval_sec = 120
      }
      ban_duration_sec = 600
      conform_action   = "allow"
      exceed_action    = "deny(429)"
      enforce_on_key   = "ALL"
    }
  }

  # default rule
  rule {
    action      = "allow"
    priority    = "2147483647"
    description = "default rule"
    match {
      versioned_expr = "SRC_IPS_V1"
      config {
        src_ip_ranges = ["*"]
      }
    }
  }
}