1 files changed, 142 insertions, 0 deletions
diff --git a/foreign/client_handling/lazagne/config/DPAPI/credhist.py b/foreign/client_handling/lazagne/config/DPAPI/credhist.py
new file mode 100644
index 0000000..2a1d8d7
--- /dev/null
+++ b/foreign/client_handling/lazagne/config/DPAPI/credhist.py
@@ -0,0 +1,142 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Code based from these two awesome projects: 
+- DPAPICK 	: https://bitbucket.org/jmichel/dpapick
+- DPAPILAB 	: https://github.com/dfirfpi/dpapilab
+"""
+
+import struct
+import hashlib
+
+from . import crypto
+from .eater import DataStruct
+
+
+class RPC_SID(DataStruct):
+    """
+    Represents a RPC_SID structure. See MSDN for documentation
+    """
+    def __init__(self, raw=None):
+        self.version = None
+        self.idAuth = None
+        self.subAuth = None
+        DataStruct.__init__(self, raw)
+
+    def parse(self, data):
+        self.version = data.eat("B")
+        n = data.eat("B")
+        self.idAuth = struct.unpack(">Q", "\0\0" + data.eat("6s"))[0]
+        self.subAuth = data.eat("%dL" % n)
+
+    def __str__(self):
+        s = ["S-%d-%d" % (self.version, self.idAuth)]
+        s += ["%d" % x for x in self.subAuth]
+        return "-".join(s)
+
+
+class CredhistEntry(DataStruct):
+
+    def __init__(self, raw=None):
+        self.pwdhash = None
+        self.hmac = None
+        self.revision = None
+        self.hashAlgo = None
+        self.rounds = None
+        self.cipherAlgo = None
+        self.shaHashLen = None
+        self.ntHashLen = None
+        self.iv = None
+        self.userSID = None
+        self.encrypted = None
+        self.revision2 = None
+        self.guid = None
+        self.ntlm = None
+        DataStruct.__init__(self, raw)
+
+    def parse(self, data):
+        self.revision = data.eat("L")
+        self.hashAlgo = crypto.CryptoAlgo(data.eat("L"))
+        self.rounds = data.eat("L")
+        data.eat("L")
+        self.cipherAlgo = crypto.CryptoAlgo(data.eat("L"))
+        self.shaHashLen = data.eat("L")
+        self.ntHashLen = data.eat("L")
+        self.iv = data.eat("16s")
+
+        self.userSID = RPC_SID()
+        self.userSID.parse(data)
+
+        n = self.shaHashLen + self.ntHashLen
+        n += -n % self.cipherAlgo.blockSize
+        self.encrypted = data.eat_string(n)
+
+        self.revision2 = data.eat("L")
+        self.guid = "%0x-%0x-%0x-%0x%0x-%0x%0x%0x%0x%0x%0x" % data.eat("L2H8B")
+
+    def decrypt_with_hash(self, pwdhash):
+        """
+        Decrypts this credhist entry with the given user's password hash.
+        Simply computes the encryption key with the given hash
+        then calls self.decrypt_with_key() to finish the decryption.
+        """
+        self.decrypt_with_key(crypto.derivePwdHash(pwdhash, str(self.userSID)))
+
+    def decrypt_with_key(self, enckey):
+        """
+        Decrypts this credhist entry using the given encryption key.
+        """
+        cleartxt = crypto.dataDecrypt(self.cipherAlgo, self.hashAlgo, self.encrypted, enckey,
+                                      self.iv, self.rounds)
+        self.pwdhash = cleartxt[:self.shaHashLen]
+        self.ntlm = cleartxt[self.shaHashLen:self.shaHashLen + self.ntHashLen].rstrip("\x00")
+        if len(self.ntlm) != 16:
+            self.ntlm = None
+
+
+class CredHistFile(DataStruct):
+
+    def __init__(self, raw=None):
+        self.entries_list = []
+        self.entries = {}
+        self.valid = False
+        self.footmagic = None
+        self.curr_guid = None
+        DataStruct.__init__(self, raw)
+
+    def parse(self, data):
+        while True:
+            l = data.pop("L")
+            if l == 0:
+                break
+            self.addEntry(data.pop_string(l - 4))
+
+        self.footmagic = data.eat("L")
+        self.curr_guid = "%0x-%0x-%0x-%0x%0x-%0x%0x%0x%0x%0x%0x" % data.eat("L2H8B")
+
+    def addEntry(self, blob):
+        """
+        Creates a CredhistEntry object with blob then adds it to the store
+        """
+        x = CredhistEntry(blob)
+        self.entries[x.guid] = x
+        self.entries_list.append(x)
+
+    def decrypt_with_hash(self, pwdhash):
+        """
+        Try to decrypt each entry with the given hash
+        """
+
+        if self.valid:
+            return
+
+        for entry in self.entries_list:
+            entry.decrypt_with_hash(pwdhash)
+
+    def decrypt_with_password(self, password):
+        """
+        Decrypts this credhist entry with the given user's password.
+        Simply computes the password hash then calls self.decrypt_with_hash()
+        """
+        self.decrypt_with_hash(hashlib.sha1(password.encode("UTF-16LE")).digest())