Restore original Security/DAST.gitlab-ci.yml

Reverts https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/26520
for Security/DAST.gitlab-ci.yml.

lib/gitlab/ci/templates/Security/DAST.gitlab-ci.yml

@@ -4,9 +4,6 @@
 # List of the variables: https://gitlab.com/gitlab-org/security-products/dast#settings
 # How to set: https://docs.gitlab.com/ee/ci/yaml/#variables
-include:
-  - template: Jobs/DAST.gitlab-ci.yml
-
 variables:
   DAST_WEBSITE: http://example.com # Please edit to be your website to scan for vulnerabilities
@@ -17,10 +14,46 @@ stages:
   - dast
 dast:
+  stage: dast
+  image: docker:stable
+  variables:
+    DOCKER_DRIVER: overlay2
+  allow_failure: true
+  services:
+    - docker:stable-dind
+  script:
+    - export DAST_VERSION=${SP_VERSION:-$(echo "$CI_SERVER_VERSION" | sed 's/^\([0-9]*\)\.\([0-9]*\).*/\1-\2-stable/')}
+    - |
+      function dast_run() {
+        docker run \
+        --env DAST_TARGET_AVAILABILITY_TIMEOUT \
+        --volume "$PWD:/output" \
+        --volume /var/run/docker.sock:/var/run/docker.sock \
+        -w /output \
+        "registry.gitlab.com/gitlab-org/security-products/dast:$DAST_VERSION" \
+        /analyze -t $DAST_WEBSITE \
+        "$@"
+      }
+    - |
+      if [ -n "$DAST_AUTH_URL" ]
+      then
+        dast_run \
+          --auth-url $DAST_AUTH_URL \
+          --auth-username $DAST_USERNAME \
+          --auth-password $DAST_PASSWORD \
+          --auth-username-field $DAST_USERNAME_FIELD \
+          --auth-password-field $DAST_PASSWORD_FIELD
+      else
+        dast_run
+      fi
+  artifacts:
+    reports:
+      dast: gl-dast-report.json
   only:
     refs:
       - branches
+    variables:
+      - $GITLAB_FEATURES =~ /\bdast\b/
   except:
-    refs: [] # Override default from template
     variables:
       - $DAST_DISABLED