From ba933dff2c342ed0095f28da2e6f90a0d12bcd3d Mon Sep 17 00:00:00 2001
From: yonder <kzxiao.hy@gmail.com>
Date: Tue, 15 Mar 2016 14:33:20 +0800
Subject: [PATCH] Add 'UsernamePasswordAuth' 'UsernamePasswordAuthResponse' to
 SOCKS

---
 netlib/socks.py           | 58 ++++++++++++++++++++++++++++++++++++++-
 test/netlib/test_socks.py | 39 ++++++++++++++++++++++++++
 2 files changed, 96 insertions(+), 1 deletion(-)

diff --git a/netlib/socks.py b/netlib/socks.py
index 51ad1c636..57ccd1be1 100644
--- a/netlib/socks.py
+++ b/netlib/socks.py
@@ -10,7 +10,6 @@ class SocksError(Exception):
         super(SocksError, self).__init__(message)
         self.code = code
 
-
 VERSION = utils.BiDi(
     SOCKS4=0x04,
     SOCKS5=0x05
@@ -47,6 +46,10 @@ METHOD = utils.BiDi(
     NO_ACCEPTABLE_METHODS=0xFF
 )
 
+USERNAME_PASSWORD_VERSION = utils.BiDi(
+    DEFAULT=0x01
+)
+
 
 class ClientGreeting(object):
     __slots__ = ("ver", "methods")
@@ -113,6 +116,59 @@ class ServerGreeting(object):
         f.write(struct.pack("!BB", self.ver, self.method))
 
 
+class UsernamePasswordAuth(object):
+    __slots__ = ("ver", "username", "password")
+
+    def __init__(self, ver, username, password):
+        self.ver = ver
+        self.username = username
+        self.password = password
+
+    def assert_authver1(self):
+        if self.ver != USERNAME_PASSWORD_VERSION.DEFAULT:
+            raise SocksError(
+                0,
+                "Invalid auth version. Expected 0x01, got 0x%x" % self.ver
+            )
+
+    @classmethod
+    def from_file(cls, f):
+        ver, ulen = struct.unpack("!BB", f.safe_read(2))
+        username = f.safe_read(ulen)
+        plen, = struct.unpack("!B", f.safe_read(1))
+        password = f.safe_read(plen)
+        return cls(ver, username.decode(), password.decode())
+
+    def to_file(self, f):
+        f.write(struct.pack("!BB", self.ver, len(self.username)))
+        f.write(self.username.encode())
+        f.write(struct.pack("!B", len(self.password)))
+        f.write(self.password.encode())
+
+
+class UsernamePasswordAuthResponse(object):
+    __slots__  = ("ver", "status")
+
+    def __init__(self, ver, status):
+        self.ver = ver
+        self.status = status
+
+    def assert_authver1(self):
+        if self.ver != USERNAME_PASSWORD_VERSION.DEFAULT:
+            raise SocksError(
+                0,
+                "Invalid auth version. Expected 0x01, got 0x%x" % self.ver
+            )
+
+    @classmethod
+    def from_file(cls, f):
+        ver, status = struct.unpack("!BB", f.safe_read(2))
+        return cls(ver, status)
+
+    def to_file(self, f):
+        f.write(struct.pack("!BB", self.ver, self.status))
+
+
 class Message(object):
     __slots__ = ("ver", "msg", "atyp", "addr")
 
diff --git a/test/netlib/test_socks.py b/test/netlib/test_socks.py
index d95dee410..486b975b0 100644
--- a/test/netlib/test_socks.py
+++ b/test/netlib/test_socks.py
@@ -85,6 +85,45 @@ def test_server_greeting_assert_socks5():
         assert False
 
 
+def test_username_password_auth():
+    raw = tutils.treader(b"\x01\x03usr\x03psd\xBE\xEF")
+    out = BytesIO()
+    auth = socks.UsernamePasswordAuth.from_file(raw)
+    auth.assert_authver1()
+    assert raw.read(2) == b"\xBE\xEF"
+    auth.to_file(out)
+
+    assert out.getvalue() == raw.getvalue()[:-2]
+    assert auth.ver == socks.USERNAME_PASSWORD_VERSION.DEFAULT
+    assert auth.username == "usr"
+    assert auth.password == "psd"
+
+
+def test_username_password_auth_assert_ver1():
+    raw = tutils.treader(b"\x02\x03usr\x03psd\xBE\xEF")
+    auth = socks.UsernamePasswordAuth.from_file(raw)
+    tutils.raises(socks.SocksError, auth.assert_authver1)
+
+
+def test_username_password_auth_response():
+    raw = tutils.treader(b"\x01\x00\xBE\xEF")
+    out = BytesIO()
+    auth = socks.UsernamePasswordAuthResponse.from_file(raw)
+    auth.assert_authver1()
+    assert raw.read(2) == b"\xBE\xEF"
+    auth.to_file(out)
+
+    assert out.getvalue() == raw.getvalue()[:-2]
+    assert auth.ver == socks.USERNAME_PASSWORD_VERSION.DEFAULT
+    assert auth.status == 0
+
+
+def test_username_password_auth_response_auth_assert_ver1():
+    raw = tutils.treader(b"\x02\x00\xBE\xEF")
+    auth = socks.UsernamePasswordAuthResponse.from_file(raw)
+    tutils.raises(socks.SocksError, auth.assert_authver1)
+
+
 def test_message():
     raw = tutils.treader(b"\x05\x01\x00\x03\x0bexample.com\xDE\xAD\xBE\xEF")
     out = BytesIO()