fix(templates): segfault in workflow parsing with global-matchers templates

pkg/templates/compile_test.go

@@ -22,6 +22,7 @@ import (
 	"github.com/projectdiscovery/nuclei/v3/pkg/progress"
 	"github.com/projectdiscovery/nuclei/v3/pkg/protocols"
 	"github.com/projectdiscovery/nuclei/v3/pkg/protocols/common/generators"
+	"github.com/projectdiscovery/nuclei/v3/pkg/protocols/common/globalmatchers"
 	"github.com/projectdiscovery/nuclei/v3/pkg/protocols/common/variables"
 	"github.com/projectdiscovery/nuclei/v3/pkg/protocols/http"
 	"github.com/projectdiscovery/nuclei/v3/pkg/templates"
@@ -184,6 +185,26 @@ func Test_ParseWorkflow(t *testing.T) {
 	require.Equal(t, len(expectedTemplate.Workflows), len(got.Workflows))
 }
 
+func Test_ParseWorkflowWithGlobalMatchers(t *testing.T) {
+	setup()
+	previousGlobalMatchers := executerOpts.Options.EnableGlobalMatchersTemplates
+	executerOpts.Options.EnableGlobalMatchersTemplates = true
+	defer func() {
+		executerOpts.Options.EnableGlobalMatchersTemplates = previousGlobalMatchers
+		executerOpts.GlobalMatchers = nil
+	}()
+	executerOpts.GlobalMatchers = globalmatchers.New()
+
+	filePath := "tests/workflow-global-matchers.yaml"
+	got, err := templates.Parse(filePath, nil, executerOpts)
+	require.NoError(t, err, "could not parse workflow template")
+	require.NotNil(t, got, "workflow template should not be nil")
+	require.NotNil(t, got.CompiledWorkflow, "compiled workflow should not be nil")
+	require.Len(t, got.CompiledWorkflow.Workflows, 2)
+	require.Len(t, got.CompiledWorkflow.Workflows[0].Executers, 1)
+	require.Len(t, got.CompiledWorkflow.Workflows[1].Executers, 0)
+}
+
 func Test_WrongTemplate(t *testing.T) {
 	setup()
 

pkg/templates/tests/global-matcher.yaml

@@ -0,0 +1,17 @@
+id: global-matcher-test
+
+info:
+  name: Global Matcher Test Template
+  author: pdteam
+  severity: info
+
+http:
+  - method: GET
+    path:
+      - "{{BaseURL}}"
+    global-matchers: true
+    matchers:
+      - type: word
+        part: body
+        words:
+          - "test"

pkg/templates/tests/workflow-global-matchers.yaml

@@ -0,0 +1,10 @@
+id: workflow-global-matchers
+
+info:
+  name: Workflow With Global Matchers
+  author: pdteam
+  severity: info
+
+workflows:
+  - template: tests/match-1.yaml
+  - template: tests/global-matcher.yaml

pkg/templates/workflows.go

@@ -77,6 +77,9 @@ func parseWorkflowTemplate(workflow *workflows.WorkflowTemplate, preprocessor Pr
 			gologger.Warning().Msgf("Could not parse workflow template %s: %v\n", path, err)
 			continue
 		}
+		if template == nil {
+			continue
+		}
 		if template.Executer == nil {
 			gologger.Warning().Msgf("Could not parse workflow template %s: no executer found\n", path)
 			continue