nuclei/v2/pkg/templates/compile.go

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package templates
import (
"fmt"
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"os"
"github.com/pkg/errors"
"github.com/projectdiscovery/nuclei/v2/pkg/protocols"
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"github.com/projectdiscovery/nuclei/v2/pkg/protocols/dns"
"github.com/projectdiscovery/nuclei/v2/pkg/protocols/http"
"github.com/projectdiscovery/nuclei/v2/pkg/workflows"
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"gopkg.in/yaml.v2"
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)
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// Parse parses a yaml request template file
func Parse(file string, options *protocols.ExecuterOptions) (*Template, error) {
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template := &Template{}
f, err := os.Open(file)
if err != nil {
return nil, err
}
err = yaml.NewDecoder(f).Decode(template)
if err != nil {
return nil, err
}
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defer f.Close()
// Setting up variables regarding template metadata
options.TemplateID = template.ID
options.TemplateInfo = template.Info
options.TemplatePath = file
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// We don't support both http and dns in a single template
if len(template.RequestsDNS) > 0 && len(template.RequestsHTTP) > 0 {
return nil, fmt.Errorf("both http and dns requests for %s", template.ID)
}
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// If no requests, and it is also not a workflow, return error.
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if len(template.RequestsDNS)+len(template.RequestsHTTP)+len(template.Workflows) == 0 {
return nil, fmt.Errorf("no requests defined for %s", template.ID)
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}
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// Compile the workflow request
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if len(template.Workflows) > 0 {
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compiled := &template.Workflow
if err := template.compileWorkflow(options, compiled); err != nil {
return nil, errors.Wrap(err, "could not compile workflow")
}
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template.Workflow.Compile(options)
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template.CompiledWorkflow = compiled
}
// Compile the requests found
for _, request := range template.RequestsDNS {
template.TotalRequests += request.Requests()
}
for _, request := range template.RequestsHTTP {
template.TotalRequests += request.Requests()
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}
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if len(template.RequestsDNS) > 0 {
template.Executer = dns.NewExecuter(template.RequestsDNS, options)
err = template.Executer.Compile()
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}
if len(template.RequestsHTTP) > 0 {
template.Executer = http.NewExecuter(template.RequestsHTTP, options)
err = template.Executer.Compile()
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}
if err != nil {
return nil, errors.Wrap(err, "could not compile request")
}
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if template.Executer != nil {
if err := template.Executer.Compile(); err != nil {
return nil, errors.Wrap(err, "could not compile template executer")
}
}
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return template, nil
}
// compileWorkflow compiles the workflow for execution
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func (t *Template) compileWorkflow(options *protocols.ExecuterOptions, workflows *workflows.Workflow) error {
for _, workflow := range workflows.Workflows {
if err := t.parseWorkflow(workflow, options); err != nil {
return err
}
}
return nil
}
// parseWorkflow parses and compiles all templates in a workflow recursively
func (t *Template) parseWorkflow(workflow *workflows.WorkflowTemplate, options *protocols.ExecuterOptions) error {
if err := t.parseWorkflowTemplate(workflow, options); err != nil {
return err
}
for _, subtemplates := range workflow.Subtemplates {
if err := t.parseWorkflow(subtemplates, options); err != nil {
return err
}
}
for _, matcher := range workflow.Matchers {
for _, subtemplates := range matcher.Subtemplates {
if err := t.parseWorkflow(subtemplates, options); err != nil {
return err
}
}
}
return nil
}
// parseWorkflowTemplate parses a workflow template creating an executer
func (t *Template) parseWorkflowTemplate(workflow *workflows.WorkflowTemplate, options *protocols.ExecuterOptions) error {
opts := protocols.ExecuterOptions{
Output: options.Output,
Options: options.Options,
Progress: options.Progress,
Catalogue: options.Catalogue,
RateLimiter: options.RateLimiter,
ProjectFile: options.ProjectFile,
}
paths, err := options.Catalogue.GetTemplatePath(workflow.Template)
if err != nil {
return errors.Wrap(err, "could not get workflow template")
}
if len(paths) != 1 {
return errors.Wrap(err, "invalid number of templates matched")
}
template, err := Parse(paths[0], &opts)
if err != nil {
return errors.Wrap(err, "could not parse workflow template")
}
workflow.Executer = template.Executer
return nil
}