[3.3] bpo-30119: fix ftplib.FTP.putline() to throw an error for a ill…

…egal command (#1214) (#2885)

Lib/ftplib.py

@@ -185,6 +185,8 @@ def sanitize(self, s):
 
     # Internal: send one line to the server, appending CRLF
     def putline(self, line):
+        if '\r' in line or '\n' in line:
+            raise ValueError('an illegal newline character should not be contained')
         line = line + CRLF
         if self.debugging > 1: print('*put*', self.sanitize(line))
         self.sock.sendall(line.encode(self.encoding))

Lib/test/test_ftplib.py

@@ -480,6 +480,9 @@ def test_sanitize(self):
         self.assertEqual(self.client.sanitize('PASS 12345'), repr('PASS *****'))
 
     def test_exceptions(self):
+        self.assertRaises(ValueError, self.client.sendcmd, 'echo 40\r\n0')
+        self.assertRaises(ValueError, self.client.sendcmd, 'echo 40\n0')
+        self.assertRaises(ValueError, self.client.sendcmd, 'echo 40\r0')
         self.assertRaises(ftplib.error_temp, self.client.sendcmd, 'echo 400')
         self.assertRaises(ftplib.error_temp, self.client.sendcmd, 'echo 499')
         self.assertRaises(ftplib.error_perm, self.client.sendcmd, 'echo 500')
@@ -488,7 +491,8 @@ def test_exceptions(self):
 
     def test_all_errors(self):
         exceptions = (ftplib.error_reply, ftplib.error_temp, ftplib.error_perm,
-                      ftplib.error_proto, ftplib.Error, IOError, EOFError)
+                      ftplib.error_proto, ftplib.Error, OSError,
+                      EOFError)
         for x in exceptions:
             try:
                 raise x('exception not included in all_errors set')

Misc/NEWS

@@ -39,6 +39,9 @@ Core and Builtins
 Library
 -------
 
+- bpo-30119: ftplib.FTP.putline() now throws ValueError on commands that contains
+  CR or LF. Patch by Dong-hee Na
+
 - [Security] bpo-30730: Prevent environment variables injection in subprocess on
   Windows.  Prevent passing other invalid environment variables and command arguments.