diff options
Diffstat (limited to 'Lib/urllib.py')
| -rw-r--r-- | Lib/urllib.py | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Lib/urllib.py b/Lib/urllib.py index 84e9dbc347..62c08c99d5 100644 --- a/Lib/urllib.py +++ b/Lib/urllib.py @@ -644,6 +644,18 @@ class FancyURLopener(URLopener): fp.close() # In case the server sent a relative URL, join with original: newurl = basejoin(self.type + ":" + url, newurl) + + # For security reasons we do not allow redirects to protocols + # other than HTTP, HTTPS or FTP. + newurl_lower = newurl.lower() + if not (newurl_lower.startswith('http://') or + newurl_lower.startswith('https://') or + newurl_lower.startswith('ftp://')): + raise IOError('redirect error', errcode, + errmsg + " - Redirection to url '%s' is not allowed" % + newurl, + headers) + return self.open(newurl) def http_error_301(self, url, fp, errcode, errmsg, headers, data=None): |