https://github.com/python/cpython/commit/5e260e0fde211829fcb67060cfd602f4b67... commit: 5e260e0fde211829fcb67060cfd602f4b679f802 branch: master author: Stephen Balousek <sbalousek@users.noreply.github.com> committer: GitHub <noreply@github.com> date: 2020-02-29T12:31:58-08:00 summary: bpo-39548: Fix handling of 'WWW-Authenticate' header for Digest Auth (GH-18338) * bpo-39548: Fix handling of 'WWW-Authenticate' header for Digest authentication - The 'qop' value in the 'WWW-Authenticate' header is optional. The presence of 'qop' in the header should be checked before its value is parsed with 'split'. Signed-off-by: Stephen Balousek <stephen@balousek.net> * bpo-39548: Fix handling of 'WWW-Authenticate' header for Digest authentication - Add NEWS item Signed-off-by: Stephen Balousek <stephen@balousek.net> * Update Misc/NEWS.d/next/Library/2020-02-06-05-33-52.bpo-39548.DF4FFe.rst Co-Authored-By: Brandt Bucher <brandtbucher@gmail.com> Co-authored-by: Brandt Bucher <brandtbucher@gmail.com> files: A Misc/NEWS.d/next/Library/2020-02-06-05-33-52.bpo-39548.DF4FFe.rst M Lib/urllib/request.py diff --git a/Lib/urllib/request.py b/Lib/urllib/request.py index a6d350a97a452..7fe50535da138 100644 --- a/Lib/urllib/request.py +++ b/Lib/urllib/request.py @@ -1138,7 +1138,9 @@ def get_authorization(self, req, chal): req.selector) # NOTE: As per RFC 2617, when server sends "auth,auth-int", the client could use either `auth` # or `auth-int` to the response back. we use `auth` to send the response back. - if 'auth' in qop.split(','): + if qop is None: + respdig = KD(H(A1), "%s:%s" % (nonce, H(A2))) + elif 'auth' in qop.split(','): if nonce == self.last_nonce: self.nonce_count += 1 else: @@ -1148,8 +1150,6 @@ def get_authorization(self, req, chal): cnonce = self.get_cnonce(nonce) noncebit = "%s:%s:%s:%s:%s" % (nonce, ncvalue, cnonce, 'auth', H(A2)) respdig = KD(H(A1), noncebit) - elif qop is None: - respdig = KD(H(A1), "%s:%s" % (nonce, H(A2))) else: # XXX handle auth-int. raise URLError("qop '%s' is not supported." % qop) diff --git a/Misc/NEWS.d/next/Library/2020-02-06-05-33-52.bpo-39548.DF4FFe.rst b/Misc/NEWS.d/next/Library/2020-02-06-05-33-52.bpo-39548.DF4FFe.rst new file mode 100644 index 0000000000000..4cf32487b1f7a --- /dev/null +++ b/Misc/NEWS.d/next/Library/2020-02-06-05-33-52.bpo-39548.DF4FFe.rst @@ -0,0 +1,2 @@ +Fix handling of header in :class:`urllib.request.AbstractDigestAuthHandler` when the optional ``qop`` parameter +is not present.