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fingerprints.go
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package wappalyzer
import (
"fmt"
"regexp"
"strconv"
"strings"
)
// Fingerprints contains a map of fingerprints for tech detection
type Fingerprints struct {
// Apps is organized as <name, fingerprint>
Apps map[string]*Fingerprint `json:"apps"`
}
// Fingerprint is a single piece of information about a tech validated and normalized
type Fingerprint struct {
Cats []int `json:"cats"`
CSS []string `json:"css"`
Cookies map[string]string `json:"cookies"`
JS []string `json:"js"`
Headers map[string]string `json:"headers"`
HTML []string `json:"html"`
Script []string `json:"scripts"`
ScriptSrc []string `json:"scriptSrcs"`
Meta map[string][]string `json:"meta"`
Implies []string `json:"implies"`
Description string `json:"description"`
Website string `json:"website"`
}
// CompiledFingerprints contains a map of fingerprints for tech detection
type CompiledFingerprints struct {
// Apps is organized as <name, fingerprint>
Apps map[string]*CompiledFingerprint
}
// CompiledFingerprint contains the compiled fingerprints from the tech json
type CompiledFingerprint struct {
// cats contain categories that are implicit with this tech
cats []int
// implies contains technologies that are implicit with this tech
implies []string
// description contains fingerprint description
description string
// website contains a URL associated with the fingerprint
website string
// cookies contains fingerprints for target cookies
cookies map[string]*versionRegex
// js contains fingerprints for the js file
js []*versionRegex
// headers contains fingerprints for target headers
headers map[string]*versionRegex
// html contains fingerprints for the target HTML
html []*versionRegex
// script contains fingerprints for scripts
script []*versionRegex
// scriptSrc contains fingerprints for script srcs
scriptSrc []*versionRegex
// meta contains fingerprints for meta tags
meta map[string][]*versionRegex
}
// AppInfo contains basic information about an App.
type AppInfo struct {
Description string
Website string
}
// CatsInfo contains basic information about an App.
type CatsInfo struct {
Cats []int
}
type versionRegex struct {
regex *regexp.Regexp
skipRegex bool
group int
}
const versionPrefix = "version:\\"
// newVersionRegex creates a new version matching regex
// TODO: handles simple group cases only as of now (no ternary)
func newVersionRegex(value string) (*versionRegex, error) {
splitted := strings.Split(value, "\\;")
if len(splitted) == 0 {
return nil, nil
}
compiled, err := regexp.Compile(splitted[0])
if err != nil {
return nil, err
}
skipRegex := splitted[0] == ""
regex := &versionRegex{regex: compiled, skipRegex: skipRegex}
for _, part := range splitted {
if strings.HasPrefix(part, versionPrefix) {
group := strings.TrimPrefix(part, versionPrefix)
if parsed, err := strconv.Atoi(group); err == nil {
regex.group = parsed
}
}
}
return regex, nil
}
// MatchString returns true if a version regex matched.
// The found version is also returned if any.
func (v *versionRegex) MatchString(value string) (bool, string) {
if v.skipRegex {
return true, ""
}
matches := v.regex.FindAllStringSubmatch(value, -1)
if len(matches) == 0 {
return false, ""
}
var version string
if v.group > 0 {
for _, match := range matches {
version = match[v.group]
}
}
return true, version
}
// part is the part of the fingerprint to match
type part int
// parts that can be matched
const (
cookiesPart part = iota + 1
jsPart
headersPart
htmlPart
scriptPart
metaPart
)
// loadPatterns loads the fingerprint patterns and compiles regexes
func compileFingerprint(fingerprint *Fingerprint) *CompiledFingerprint {
compiled := &CompiledFingerprint{
cats: fingerprint.Cats,
implies: fingerprint.Implies,
description: fingerprint.Description,
website: fingerprint.Website,
cookies: make(map[string]*versionRegex),
js: make([]*versionRegex, 0, len(fingerprint.JS)),
headers: make(map[string]*versionRegex),
html: make([]*versionRegex, 0, len(fingerprint.HTML)),
script: make([]*versionRegex, 0, len(fingerprint.Script)),
scriptSrc: make([]*versionRegex, 0, len(fingerprint.ScriptSrc)),
meta: make(map[string][]*versionRegex),
}
for header, pattern := range fingerprint.Cookies {
fingerprint, err := newVersionRegex(pattern)
if err != nil {
continue
}
compiled.cookies[header] = fingerprint
}
for _, pattern := range fingerprint.JS {
fingerprint, err := newVersionRegex(pattern)
if err != nil {
continue
}
compiled.js = append(compiled.js, fingerprint)
}
for header, pattern := range fingerprint.Headers {
fingerprint, err := newVersionRegex(pattern)
if err != nil {
continue
}
compiled.headers[header] = fingerprint
}
for _, pattern := range fingerprint.HTML {
fingerprint, err := newVersionRegex(pattern)
if err != nil {
continue
}
compiled.html = append(compiled.html, fingerprint)
}
for _, pattern := range fingerprint.Script {
fingerprint, err := newVersionRegex(pattern)
if err != nil {
continue
}
compiled.script = append(compiled.script, fingerprint)
}
for _, pattern := range fingerprint.ScriptSrc {
fingerprint, err := newVersionRegex(pattern)
if err != nil {
continue
}
compiled.scriptSrc = append(compiled.scriptSrc, fingerprint)
}
for meta, patterns := range fingerprint.Meta {
var compiledList []*versionRegex
for _, pattern := range patterns {
fingerprint, err := newVersionRegex(pattern)
if err != nil {
continue
}
compiledList = append(compiledList, fingerprint)
}
compiled.meta[meta] = compiledList
}
return compiled
}
// matchString matches a string for the fingerprints
func (f *CompiledFingerprints) matchString(data string, part part) []string {
var matched bool
var technologies []string
for app, fingerprint := range f.Apps {
var version string
switch part {
case jsPart:
for _, pattern := range fingerprint.js {
if valid, versionString := pattern.MatchString(data); valid {
matched = true
version = versionString
}
}
case scriptPart:
for _, pattern := range fingerprint.scriptSrc {
if valid, versionString := pattern.MatchString(data); valid {
matched = true
version = versionString
}
}
case htmlPart:
for _, pattern := range fingerprint.html {
if valid, versionString := pattern.MatchString(data); valid {
matched = true
version = versionString
}
}
}
// If no match, continue with the next fingerprint
if !matched {
continue
}
if version != "" {
app = formatAppVersion(app, version)
}
// Append the technologies as well as implied ones
technologies = append(technologies, app)
if len(fingerprint.implies) > 0 {
technologies = append(technologies, fingerprint.implies...)
}
matched = false
}
return technologies
}
// matchKeyValue matches a key-value store map for the fingerprints
func (f *CompiledFingerprints) matchKeyValueString(key, value string, part part) []string {
var matched bool
var technologies []string
for app, fingerprint := range f.Apps {
var version string
switch part {
case cookiesPart:
for data, pattern := range fingerprint.cookies {
if data != key {
continue
}
if valid, versionString := pattern.MatchString(value); valid {
matched = true
version = versionString
break
}
}
case headersPart:
for data, pattern := range fingerprint.headers {
if data != key {
continue
}
if valid, versionString := pattern.MatchString(value); valid {
matched = true
version = versionString
break
}
}
case metaPart:
for data, patterns := range fingerprint.meta {
if data != key {
continue
}
for _, pattern := range patterns {
if valid, versionString := pattern.MatchString(value); valid {
matched = true
version = versionString
break
}
}
}
}
// If no match, continue with the next fingerprint
if !matched {
continue
}
// Append the technologies as well as implied ones
if version != "" {
app = formatAppVersion(app, version)
}
technologies = append(technologies, app)
if len(fingerprint.implies) > 0 {
technologies = append(technologies, fingerprint.implies...)
}
matched = false
}
return technologies
}
// matchMapString matches a key-value store map for the fingerprints
func (f *CompiledFingerprints) matchMapString(keyValue map[string]string, part part) []string {
var matched bool
var technologies []string
for app, fingerprint := range f.Apps {
var version string
switch part {
case cookiesPart:
for data, pattern := range fingerprint.cookies {
value, ok := keyValue[data]
if !ok {
continue
}
if pattern == nil {
matched = true
}
if valid, versionString := pattern.MatchString(value); valid {
matched = true
version = versionString
break
}
}
case headersPart:
for data, pattern := range fingerprint.headers {
value, ok := keyValue[data]
if !ok {
continue
}
if valid, versionString := pattern.MatchString(value); valid {
matched = true
version = versionString
break
}
}
case metaPart:
for data, patterns := range fingerprint.meta {
value, ok := keyValue[data]
if !ok {
continue
}
for _, pattern := range patterns {
if valid, versionString := pattern.MatchString(value); valid {
matched = true
version = versionString
break
}
}
}
}
// If no match, continue with the next fingerprint
if !matched {
continue
}
// Append the technologies as well as implied ones
if version != "" {
app = formatAppVersion(app, version)
}
technologies = append(technologies, app)
if len(fingerprint.implies) > 0 {
technologies = append(technologies, fingerprint.implies...)
}
matched = false
}
return technologies
}
func formatAppVersion(app, version string) string {
return fmt.Sprintf("%s:%s", app, version)
}
// GetFingerprints returns the fingerprint string from wappalyzer
func GetFingerprints() string {
return fingerprints
}