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web_server.go
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package main
import "github.com/digininja/vuLnDAP/config"
import "gopkg.in/russross/blackfriday.v2"
import "io/ioutil"
import (
"bytes"
"fmt"
"gopkg.in/ldap.v2"
"net/http"
"reflect"
"strings"
)
type WebServer struct {
verbose bool
listenIP string
listenPort int
}
func NewWebServer(config config.Config) WebServer {
webserver := WebServer{}
webserver.listenIP = config.WebServer.ListenIP
webserver.listenPort = config.WebServer.ListenPort
return webserver
}
func (w *WebServer) getHTMLHeader(title string) string {
header := `<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">`
header = header + `<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">`
header = header + "<head>"
header = header + "<title>*TITLE*</title>"
header = header + "<link rel=\"shortcut icon\" type=\"image/x-icon\" href=\"/favicon.ico\" />"
header = header + "<link rel=\"apple-touch-icon\" href=\"/apple-touch-icon.png\" />"
header = header + "</head><body>"
header = strings.Replace(header, "*TITLE*", title, -1)
return header
}
func (w *WebServer) getHTMLFooter() string {
footer := `<hr /><p>Lab created by <a href='https://twitter.com/digininja'>Digininja</a>, for more information see <a href='https://digi.ninja/projects/vulndap.php'>the vuLnDAP project</a>.</p>
<!-- Global site tag (gtag.js) - Google Analytics -->
<script type="text/javascript" src="https://www.googletagmanager.com/gtag/js?id=UA-7503551-6"></script>
</body></html>`
return footer
}
func (w *WebServer) handleRequestStock(writer http.ResponseWriter, r *http.Request) {
form := w.getHTMLHeader("Stock Control")
form = form + `
<h1>Stock Control</h1>
<p>
<a href="/">Main Menu</a>
</p>
<p>Please select a category:</p>
<ul>
<li><a href="/fruit_or_veg?objectClass=fruits">Fruit</a></li>
<li><a href="/fruit_or_veg?objectClass=vegetables">Veg</a></li>
</ul>
`
form = form + w.getHTMLFooter()
fmt.Fprintf(writer, form)
}
func (w *WebServer) handleRequestItem(writer http.ResponseWriter, r *http.Request) {
var filter string
var attributes []string
var disp string
var cn string
r.ParseForm() // parse arguments, you have to call this by yourself
if val, ok := r.Form["cn"]; ok {
cn = val[0]
clientLogger.Debug(fmt.Sprintf("cn: %s", cn))
} else {
clientLogger.Debug("No choice")
http.Redirect(writer, r, "/stock", http.StatusFound)
return
}
if val, ok := r.Form["disp"]; ok {
disp = val[0]
clientLogger.Debug(fmt.Sprintf("attributes: %s", disp))
} else {
disp = "stock,cn,description"
}
filter = fmt.Sprintf("(cn=%s)", cn)
disp = disp + ",objectClass"
attributes = strings.Split(disp, ",")
fmt.Fprintf(writer, w.getHTMLHeader(cn))
if filter != "" && len(attributes) > 0 {
clientLogger.Debug("Params passed")
fmt.Fprintf(writer, "<!-- Search filter: %s -->", filter)
sr, err := VulndapConnection.search(writer, filter, attributes, 0)
if err != nil {
fmt.Fprintf(writer, "<p>Search failed:<br />")
fmt.Fprintf(writer, "%s</p>", err)
clientLogger.Info("Search failed, possibly invalid search filter")
if w.verbose {
clientLogger.Debug(err)
}
return
}
clientLogger.Info(fmt.Sprintf("Returned %d result(s)", len(sr.Entries)))
if len(sr.Entries) == 0 {
fmt.Fprintf(writer, "<p>No results found</p>")
return
}
entry := sr.Entries[0]
// fmt.Fprintf(writer, "entry type: %s<br />", reflect.TypeOf(entry))
clientLogger.Debug(fmt.Sprintf("DN: %s", entry.DN))
cn := ""
var buffer bytes.Buffer
// Default to fruits so back goes back to something
objectClass := "fruits"
for _, attr := range entry.Attributes {
// clientLogger.Info("attr type: %s<br />", reflect.TypeOf(attr))
switch attr.Name {
case "cn":
cn = attr.Values[0]
clientLogger.Debug(fmt.Sprintf("cn: %s", cn))
case "objectClass":
objectClass = attr.Values[0]
clientLogger.Debug(fmt.Sprintf("objectClass: %s", objectClass))
default:
clientLogger.Debug(fmt.Sprintf("%s: %s", attr.Name, strings.Join(attr.Values, ", ")))
buffer.WriteString(fmt.Sprintf("<dt>%s</dt><dd>%s</dd>", attr.Name, strings.Join(attr.Values, ", ")))
}
}
fmt.Fprintf(writer, "<h1>%s</h1>", cn)
fmt.Fprintf(writer, "<p><a href='/'>Main Menu</a></p>")
fmt.Fprintf(writer, "<dl>%s</dl>", buffer.String())
fmt.Fprintf(writer, "<p><a href='/fruit_or_veg?objectClass=%s'>« Back</a></p>", objectClass)
fmt.Fprintf(writer, "<br />")
}
fmt.Fprintf(writer, w.getHTMLFooter())
}
func (w *WebServer) handleRequestFruitOrVeg(writer http.ResponseWriter, r *http.Request) {
r.ParseForm() // parse arguments, you have to call this by yourself
/*
fmt.Println(r.Form) // print form information in server side
fmt.Println("path", r.URL.Path)
fmt.Println("scheme", r.URL.Scheme)
fmt.Println(r.Form["url_long"])
*/
var filter string
var attributes []string
var fruit_or_veg string
fruit_or_veg = ""
if val, ok := r.Form["objectClass"]; ok {
fruit_or_veg = val[0]
clientLogger.Info(fmt.Sprintf("They chose: %s", fruit_or_veg))
} else {
clientLogger.Info("No choice, redirecting")
http.Redirect(writer, r, "/stock", http.StatusFound)
}
form := w.getHTMLHeader("XXX")
form = form + `
<h1>XXX</h1>
<p>
<a href="/">Main Menu</a>
</p>
`
fruit_or_veg = strings.Replace(fruit_or_veg, "(", "", -1)
fruit_or_veg = strings.Replace(fruit_or_veg, ")", "", -1)
if fruit_or_veg != "" {
form = strings.Replace(form, "XXX", fruit_or_veg, -1)
fmt.Fprintf(writer, form)
filter = fmt.Sprintf("(objectClass=%s)", ldap.EscapeFilter(fruit_or_veg))
attributes = []string{"cn", "description"}
if filter != "" && len(attributes) > 0 {
clientLogger.Debug("Params passed")
fmt.Fprintf(writer, "<!-- Search filter: %s -->", filter)
sr, err := VulndapConnection.search(writer, filter, attributes, 0)
if err != nil {
fmt.Fprintf(writer, "<p>Search failed:<br />")
fmt.Fprintf(writer, "%s</p>", err)
clientLogger.Info("Search failed, possibly invalid search filter")
if w.verbose {
clientLogger.Error(err)
}
return
}
message := (fmt.Sprintf("Returned %d result(s)", len(sr.Entries)))
clientLogger.Info(message)
fmt.Fprintf(writer, message+"<br />")
// sr type: ldap.SearchResult
// entry type: *ldap.Entry - https://godoc.org/gopkg.in/ldap.v2#Entry
// attr type: *ldap.EntryAttribute - https://godoc.org/gopkg.in/ldap.v2#EntryAttribute
// clientLogger.Info("sr type: %s<br />", reflect.TypeOf(sr))
for _, entry := range sr.Entries {
// fmt.Fprintf(writer, "entry type: %s<br />", reflect.TypeOf(entry))
clientLogger.Debug(fmt.Sprintf("DN: %s", entry.DN))
message = fmt.Sprintf("\n<!-- DN: %s-->\n", entry.DN)
fmt.Fprintf(writer, message)
cn := ""
description := ""
for _, attr := range entry.Attributes {
clientLogger.Debug(fmt.Sprintf("attr type: %s<br />", reflect.TypeOf(attr)))
clientLogger.Debug(fmt.Sprintf("%s: %s", attr.Name, strings.Join(attr.Values, ", ")))
if attr.Name == "cn" {
cn = attr.Values[0]
}
if attr.Name == "description" {
description = attr.Values[0]
}
}
fmt.Fprintf(writer, "<h2>%s</h2>", cn)
fmt.Fprintf(writer, "<p>%s</p>", description)
fmt.Fprintf(writer, "<p><a href='/item?cn=%s&disp=stock,description,cn'>More Info</a></p>", cn)
}
}
} else {
form = strings.Replace(form, "XXX", "No Results", -1)
fmt.Fprintf(writer, form)
}
fmt.Fprintf(writer, "<p><a href='/stock'>« Back</a></p>")
fmt.Fprintf(writer, w.getHTMLFooter())
}
func (w *WebServer) handleRequestRaw(writer http.ResponseWriter, r *http.Request) {
form := w.getHTMLHeader("Raw Queries")
form = form + `
<h1>Raw Queries</h1>
<p>
<a href="/">Main Menu</a>
</p>
<p>Enter a raw query.</p>
<form method="get">
Filter: <input type="text" name="filter" id="filter" value="**FILTER**" /><br />
Attributes: <input type="text" name="attributes" id="filter" value="**ATTRIBUTES**" /><br />
<input type="submit" value="Search" name="search" />
</form>
`
r.ParseForm() // parse arguments, you have to call this by yourself
/*
fmt.Println(r.Form) // print form information in server side
fmt.Println("path", r.URL.Path)
fmt.Println("scheme", r.URL.Scheme)
fmt.Println(r.Form["url_long"])
*/
var filter string
var attributes []string
var attr_string string
if val, ok := r.Form["attributes"]; ok {
attr_string = val[0]
clientLogger.Info(fmt.Sprintf("Attributes: %s", attr_string))
} else {
clientLogger.Info("Missing attributes")
}
if val, ok := r.Form["filter"]; ok {
filter = val[0]
clientLogger.Info(fmt.Sprintf("Filter: %s", filter))
} else {
clientLogger.Info("Missing Filter")
}
form = strings.Replace(form, "**FILTER**", filter, -1)
form = strings.Replace(form, "**ATTRIBUTES**", attr_string, -1)
fmt.Fprintf(writer, form)
attributes = strings.Split(attr_string, ",")
if filter != "" && len(attributes) > 0 {
clientLogger.Debug("Params passed")
sr, err := VulndapConnection.search(writer, filter, attributes, 0)
if err != nil {
fmt.Fprintf(writer, "<p>Search failed:<br />")
fmt.Fprintf(writer, "%s</p>", err)
clientLogger.Info("Search failed, possibly invalid search filter")
if w.verbose {
clientLogger.Error(err)
}
return
}
message := (fmt.Sprintf("Returned %d result(s)", len(sr.Entries)))
clientLogger.Info(message)
fmt.Fprintf(writer, "<p>%s</p>", message)
// sr type: ldap.SearchResult
// entry type: *ldap.Entry - https://godoc.org/gopkg.in/ldap.v2#Entry
// attr type: *ldap.EntryAttribute - https://godoc.org/gopkg.in/ldap.v2#EntryAttribute
// clientLogger.Info("sr type: %s<br />", reflect.TypeOf(sr))
for _, entry := range sr.Entries {
// fmt.Fprintf(writer, "entry type: %s<br />", reflect.TypeOf(entry))
clientLogger.Debug(fmt.Sprintf("DN: %s", entry.DN))
message = fmt.Sprintf("<h2>DN: %s</h2>\n", entry.DN)
fmt.Fprintf(writer, message)
for _, attr := range entry.Attributes {
clientLogger.Debug(fmt.Sprintf("attr type: %s", reflect.TypeOf(attr)))
clientLogger.Debug(fmt.Sprintf("%s: %s", attr.Name, strings.Join(attr.Values, ", ")))
fmt.Fprintf(writer, "<p>%s:%s</p>", attr.Name, strings.Join(attr.Values, ", "))
}
}
}
fmt.Fprintf(writer, w.getHTMLFooter())
}
/*
func (w *WebServer) handleRequestLogin(writer http.ResponseWriter, r *http.Request) {
form := `
<h1>Welcome to vuLnDAP!</h1>
<p>
<a href="/">Main Menu</a>
</p>
<p>The UID tesla will get you a search result</p>
<form method="get">
UID: <input type="text" name="uid" id="uid" value="**UID**" /><br />
Given: <input type="text" name="given" id="given" value="**GIVEN**" /><br />
<input type="submit" value="Search" name="search" />
</form>
`
r.ParseForm() // parse arguments, you have to call this by yourself
/*
fmt.Println(r.Form) // print form information in server side
fmt.Println("path", r.URL.Path)
fmt.Println("scheme", r.URL.Scheme)
fmt.Println(r.Form["url_long"])
* /
var filter string
var uid string
var given string
attributes := []string{"*"}
if val, ok := r.Form["given"]; ok {
given = val[0]
clientLogger.Info(fmt.Sprintf("Given: %s", given))
} else {
clientLogger.Println("Missing Given")
}
form = strings.Replace(form, "**GIVEN**", given, -1)
if val, ok := r.Form["uid"]; ok {
uid = val[0]
clientLogger.Info(fmt.Sprintf("UID: %s", uid))
} else {
clientLogger.Println("Missing UID")
}
form = strings.Replace(form, "**UID**", uid, -1)
fmt.Fprintf(writer, form)
if uid != "" && len(attributes) > 0 {
clientLogger.Println("Params passed")
filter = fmt.Sprintf("(&(uid=%s)()", uid)
filter = fmt.Sprintf("(&(uid=%s)(givenName=%s))", uid, given)
VulndapConnection.search(writer, filter, attributes, 1)
}
}
func (w *WebServer) handleRequestHarder(writer http.ResponseWriter, r *http.Request) {
form := `
<h1>Welcome to vuLnDAP!</h1>
<p>
<a href="/">« Menu</a>
</p>
<p>The UID tesla will get you a search result</p>
<form method="get">
UID: <input type="text" name="uid" id="uid" value="**UID**" /><br />
sn: <input checked="checked" type="checkbox" value="sn" name="attributes[]" /><br />
givenName: <input checked="checked" type="checkbox" value="givenName" name="attributes[]" /><br />
cn: <input checked="checked" type="checkbox" value="cn" name="attributes[]" /><br />
displayName: <input checked="checked" type="checkbox" value="displayName" name="attributes[]" /><br />
uidNumber: <input checked="checked" type="checkbox" value="uidNumber" name="attributes[]" /><br />
gidNumber: <input checked="checked" type="checkbox" value="gidNumber" name="attributes[]" /><br />
gecos: <input checked="checked" type="checkbox" value="gecos" name="attributes[]" /><br />
loginShell: <input checked="checked" type="checkbox" value="loginShell" name="attributes[]" /><br />
homeDirectory: <input checked="checked" type="checkbox" value="homeDirectory" name="attributes[]" /><br />
<input type="submit" value="Search" name="search" />
</form>
`
r.ParseForm() // parse arguments, you have to call this by yourself
/*
fmt.Println(r.Form) // print form information in server side
fmt.Println("path", r.URL.Path)
fmt.Println("scheme", r.URL.Scheme)
fmt.Println(r.Form["url_long"])
* /
var filter string
var attributes []string
var uid string
if val, ok := r.Form["attributes[]"]; ok {
attributes = val
clientLogger.Info(fmt.Sprintf("Attributes: %s", strings.Join(attributes, ",")))
} else {
clientLogger.Println("Missing attributes")
}
if val, ok := r.Form["uid"]; ok {
uid = val[0]
clientLogger.Info(fmt.Sprintf("UID: %s", uid))
} else {
clientLogger.Println("Missing UID")
}
form = strings.Replace(form, "**UID**", uid, -1)
fmt.Fprintf(writer, form)
if uid != "" && len(attributes) > 0 {
clientLogger.Println("Params passed")
filter = fmt.Sprintf("(&(uid=%s)(objectClass=inetOrgPerson))", uid)
VulndapConnection.search(writer, filter, attributes, 0)
}
}
func (w *WebServer) handleRequestBasic(writer http.ResponseWriter, r *http.Request) {
form := `
<h1>Welcome to vuLnDAP!</h1>
<script>
function do_search() {
var uid_val = document.getElementById("uid").value;
var filter_ele = document.getElementById("filter")
filter_ele.value = "(&(objectClass=inetOrgPerson)(uid=" + uid_val + "))";
return true;
}
</script>
<p>
<a href="/">« Menu</a>
</p>
<p>The UID tesla will get you a search result</p>
<form method="get">
<input type="hidden" value="" id="filter" name="filter" />
UID: <input type="text" name="uid" id="uid" value="**UID**" /><br />
sn: <input checked="checked" type="checkbox" value="sn" name="attributes[]" /><br />
givenName: <input checked="checked" type="checkbox" value="givenName" name="attributes[]" /><br />
cn: <input checked="checked" type="checkbox" value="cn" name="attributes[]" /><br />
displayName: <input checked="checked" type="checkbox" value="displayName" name="attributes[]" /><br />
uidNumber: <input checked="checked" type="checkbox" value="uidNumber" name="attributes[]" /><br />
gidNumber: <input checked="checked" type="checkbox" value="gidNumber" name="attributes[]" /><br />
gecos: <input checked="checked" type="checkbox" value="gecos" name="attributes[]" /><br />
loginShell: <input checked="checked" type="checkbox" value="loginShell" name="attributes[]" /><br />
homeDirectory: <input checked="checked" type="checkbox" value="homeDirectory" name="attributes[]" /><br />
<input onclick="return do_search()" type="submit" value="Search" name="search" />
</form>
`
r.ParseForm() // parse arguments, you have to call this by yourself
/*
fmt.Println(r.Form) // print form information in server side
fmt.Println("path", r.URL.Path)
fmt.Println("scheme", r.URL.Scheme)
fmt.Println(r.Form["url_long"])
* /
var filter string
var uid string
var attributes []string
if val, ok := r.Form["attributes[]"]; ok {
attributes = val
clientLogger.Info(fmt.Sprintf("Attributes: %s", strings.Join(attributes, ",")))
} else {
clientLogger.Println("Missing attributes")
}
if val, ok := r.Form["filter"]; ok {
filter = val[0]
clientLogger.Info(fmt.Sprintf("Filter: %s", filter))
} else {
clientLogger.Println("Missing filter")
}
// This is only needed to reset the input field when the form is redrawn
if val, ok := r.Form["uid"]; ok {
uid = val[0]
clientLogger.Info(fmt.Sprintf("UID: %s", uid))
} else {
clientLogger.Println("Missing uid")
}
form = strings.Replace(form, "**UID**", uid, -1)
fmt.Fprintf(writer, form)
if filter != "" && len(attributes) > 0 {
VulndapConnection.search(writer, filter, attributes, 0)
}
/*
for k, v := range r.Form {
fmt.Println("key:", k)
fmt.Println("val:", strings.Join(v, ""))
}
* /
}
*/
func (w *WebServer) handleRequestScript(writer http.ResponseWriter, r *http.Request) {
writer.Header().Set("Content-Type", "application/javascript")
form := `window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', 'UA-7503551-6');`
fmt.Fprintf(writer, form)
}
func (w *WebServer) handleRequestIndex(writer http.ResponseWriter, r *http.Request) {
form := w.getHTMLHeader("vuLnDAP")
form = form + `
<h1>vuLnDAP</h1>
<p>
The challenge... Useless Inc. is running its stock control system on the same LDAP server the network uses for authentication, abuse this relationship to find details of the system users. As a bonus, it is known that the admins store SSH keys in the database, see if you can find anything interesting in there.</p>
<ul>
<li><a href="/stock">Stock Control</a></li>
</ul>
<p>Here are some extra features which can help if you get stuck.</p>
<ul>
<li><a href="/raw">Enter raw commands</a></li>
<li><a href="/resources">Some useful resources</a></li>
</ul>
<p>If you get really stuck I've published a <a href="https://digi.ninja/blog/vulndap_walkthrough.php">full walkthrough</a>.</p>
`
fmt.Fprintf(writer, form)
fmt.Fprintf(writer, w.getHTMLFooter())
}
func (w *WebServer) handleRequestResources(writer http.ResponseWriter, r *http.Request) {
fmt.Fprintf(writer, w.getHTMLHeader("Resources"))
markdownResources, err := ioutil.ReadFile("resources.md")
if err != nil {
clientLogger.Println("Unable to open resources.md")
fmt.Fprintf(writer, "Unable to open resources.md")
return
}
htmlResources := blackfriday.Run(markdownResources)
menu := `
<p>
<a href="/">Main Menu</a>
</p>
`
fmt.Fprintf(writer, menu)
fmt.Fprintf(writer, string(htmlResources))
fmt.Fprintf(writer, w.getHTMLFooter())
}
func appleHandler(w http.ResponseWriter, r *http.Request) {
http.ServeFile(w, r, "resources/apple-touch-icon.png")
}
func faviconHandler(w http.ResponseWriter, r *http.Request) {
http.ServeFile(w, r, "resources/favicon.ico")
}
func (w *WebServer) startWebApp() {
http.HandleFunc("/", w.handleRequestIndex) // set route
http.HandleFunc("/raw", w.handleRequestRaw)
http.HandleFunc("/stock", w.handleRequestStock)
http.HandleFunc("/fruit_or_veg", w.handleRequestFruitOrVeg)
http.HandleFunc("/item", w.handleRequestItem)
http.HandleFunc("/resources", w.handleRequestResources)
http.HandleFunc("/script", w.handleRequestScript)
http.HandleFunc("/favicon.ico", faviconHandler)
http.HandleFunc("/apple-touch-icon.png", appleHandler)
/*
not currently used
http.HandleFunc("/basic", w.handleRequestBasic)
http.HandleFunc("/harder", w.handleRequestHarder)
http.HandleFunc("/login", w.handleRequestLogin)
*/
clientLogger.Info(fmt.Sprintf("Starting web server on %s:%d", w.listenIP, w.listenPort))
err := http.ListenAndServe(fmt.Sprintf("%s:%d", w.listenIP, w.listenPort), nil) // set listen IP and port
if err != nil {
clientLogger.Fatal(fmt.Sprintf("ListenAndServe: %s", err))
}
}