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http_proxy_base_filters.go
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/
http_proxy_base_filters.go
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package http_proxy
import (
"io/ioutil"
"net/http"
"strings"
"github.com/elazarl/goproxy"
"github.com/evilsocket/islazy/tui"
)
func (p *HTTPProxy) fixRequestHeaders(req *http.Request) {
req.Header.Del("Accept-Encoding")
req.Header.Del("If-None-Match")
req.Header.Del("If-Modified-Since")
req.Header.Del("Upgrade-Insecure-Requests")
req.Header.Set("Pragma", "no-cache")
}
func (p *HTTPProxy) onRequestFilter(req *http.Request, ctx *goproxy.ProxyCtx) (*http.Request, *http.Response) {
if p.shouldProxy(req) {
p.Debug("< %s %s %s%s", req.RemoteAddr, req.Method, req.Host, req.URL.Path)
p.fixRequestHeaders(req)
redir := p.stripper.Preprocess(req, ctx)
if redir != nil {
// we need to redirect the user in order to make
// some session cookie expire
return req, redir
}
// do we have a proxy script?
if p.Script == nil {
return req, nil
}
// run the module OnRequest callback if defined
jsreq, jsres := p.Script.OnRequest(req)
if jsreq != nil {
// the request has been changed by the script
p.logRequestAction(req, jsreq)
return jsreq.ToRequest(), nil
} else if jsres != nil {
// a fake response has been returned by the script
p.logResponseAction(req, jsres)
return req, jsres.ToResponse(req)
}
}
return req, nil
}
func (p *HTTPProxy) getHeader(res *http.Response, header string) string {
header = strings.ToLower(header)
for name, values := range res.Header {
for _, value := range values {
if strings.ToLower(name) == header {
return value
}
}
}
return ""
}
func (p *HTTPProxy) isScriptInjectable(res *http.Response) (bool, string) {
if p.jsHook == "" {
return false, ""
} else if contentType := p.getHeader(res, "Content-Type"); strings.Contains(contentType, "text/html") {
return true, contentType
}
return false, ""
}
func (p *HTTPProxy) doScriptInjection(res *http.Response, cType string) (error, *http.Response) {
defer res.Body.Close()
raw, err := ioutil.ReadAll(res.Body)
if err != nil {
return err, nil
} else if html := string(raw); strings.Contains(html, "</head>") {
p.Info("> injecting javascript (%d bytes) into %s (%d bytes) for %s",
len(p.jsHook),
tui.Yellow(res.Request.Host+res.Request.URL.Path),
len(raw),
tui.Bold(strings.Split(res.Request.RemoteAddr, ":")[0]))
html = strings.Replace(html, "</head>", p.jsHook, -1)
newResp := goproxy.NewResponse(res.Request, cType, res.StatusCode, html)
for k, vv := range res.Header {
for _, v := range vv {
newResp.Header.Add(k, v)
}
}
return nil, newResp
}
return nil, nil
}
func (p *HTTPProxy) onResponseFilter(res *http.Response, ctx *goproxy.ProxyCtx) *http.Response {
// sometimes it happens ¯\_(ツ)_/¯
if res == nil {
return nil
}
if p.shouldProxy(res.Request) {
p.Debug("> %s %s %s%s", res.Request.RemoteAddr, res.Request.Method, res.Request.Host, res.Request.URL.Path)
p.stripper.Process(res, ctx)
// do we have a proxy script?
if p.Script != nil {
_, jsres := p.Script.OnResponse(res)
if jsres != nil {
// the response has been changed by the script
p.logResponseAction(res.Request, jsres)
return jsres.ToResponse(res.Request)
}
}
// inject javascript code if specified and needed
if doInject, cType := p.isScriptInjectable(res); doInject {
if err, injectedResponse := p.doScriptInjection(res, cType); err != nil {
p.Error("error while injecting javascript: %s", err)
} else if injectedResponse != nil {
return injectedResponse
}
}
}
return res
}
func (p *HTTPProxy) logRequestAction(req *http.Request, jsreq *JSRequest) {
p.sess.Events.Add(p.Name+".spoofed-request", struct {
To string
Method string
Host string
Path string
Size int
}{
strings.Split(req.RemoteAddr, ":")[0],
jsreq.Method,
jsreq.Hostname,
jsreq.Path,
len(jsreq.Body),
})
}
func (p *HTTPProxy) logResponseAction(req *http.Request, jsres *JSResponse) {
p.sess.Events.Add(p.Name+".spoofed-response", struct {
To string
Method string
Host string
Path string
Size int
}{
strings.Split(req.RemoteAddr, ":")[0],
req.Method,
req.Host,
req.URL.Path,
len(jsres.Body),
})
}