branchcache: do not accept "empty update"
This currently does not happens and it will be simpler that is remains that way.
If all update do something, we will be able to simply declare, in a later
changesets, that all update to result in a dirty branchcache.
import base64
import hashlib
from mercurial.hgweb import common
from mercurial import node
def parse_keqv_list(req, l):
"""Parse list of key=value strings where keys are not duplicated."""
parsed = {}
for elt in l:
k, v = elt.split(b'=', 1)
if v[0:1] == b'"' and v[-1:] == b'"':
v = v[1:-1]
parsed[k] = v
return parsed
class digestauthserver:
def __init__(self):
self._user_hashes = {}
def gethashers(self):
def _md5sum(x):
m = hashlib.md5()
m.update(x)
return node.hex(m.digest())
h = _md5sum
kd = lambda s, d, h=h: h(b"%s:%s" % (s, d))
return h, kd
def adduser(self, user, password, realm):
h, kd = self.gethashers()
a1 = h(b'%s:%s:%s' % (user, realm, password))
self._user_hashes[(user, realm)] = a1
def makechallenge(self, realm):
# We aren't testing the protocol here, just that the bytes make the
# proper round trip. So hardcoded seems fine.
nonce = b'064af982c5b571cea6450d8eda91c20d'
return b'realm="%s", nonce="%s", algorithm=MD5, qop="auth"' % (
realm,
nonce,
)
def checkauth(self, req, header):
log = req.rawenv[b'wsgi.errors']
h, kd = self.gethashers()
resp = parse_keqv_list(req, header.split(b', '))
if resp.get(b'algorithm', b'MD5').upper() != b'MD5':
log.write(b'Unsupported algorithm: %s' % resp.get(b'algorithm'))
raise common.ErrorResponse(
common.HTTP_FORBIDDEN, b"unknown algorithm"
)
user = resp[b'username']
realm = resp[b'realm']
nonce = resp[b'nonce']
ha1 = self._user_hashes.get((user, realm))
if not ha1:
log.write(b'No hash found for user/realm "%s/%s"' % (user, realm))
raise common.ErrorResponse(common.HTTP_FORBIDDEN, b"bad user")
qop = resp.get(b'qop', b'auth')
if qop != b'auth':
log.write(b"Unsupported qop: %s" % qop)
raise common.ErrorResponse(common.HTTP_FORBIDDEN, b"bad qop")
cnonce, ncvalue = resp.get(b'cnonce'), resp.get(b'nc')
if not cnonce or not ncvalue:
log.write(b'No cnonce (%s) or ncvalue (%s)' % (cnonce, ncvalue))
raise common.ErrorResponse(common.HTTP_FORBIDDEN, b"no cnonce")
a2 = b'%s:%s' % (req.method, resp[b'uri'])
noncebit = b"%s:%s:%s:%s:%s" % (nonce, ncvalue, cnonce, qop, h(a2))
respdig = kd(ha1, noncebit)
if respdig != resp[b'response']:
log.write(
b'User/realm "%s/%s" gave %s, but expected %s'
% (user, realm, resp[b'response'], respdig)
)
return False
return True
digest = digestauthserver()
def perform_authentication(hgweb, req, op):
auth = req.headers.get(b'Authorization')
if req.headers.get(b'X-HgTest-AuthType') == b'Digest':
if not auth:
challenge = digest.makechallenge(b'mercurial')
raise common.ErrorResponse(
common.HTTP_UNAUTHORIZED,
b'who',
[(b'WWW-Authenticate', b'Digest %s' % challenge)],
)
if not digest.checkauth(req, auth[7:]):
raise common.ErrorResponse(common.HTTP_FORBIDDEN, b'no')
return
if not auth:
raise common.ErrorResponse(
common.HTTP_UNAUTHORIZED,
b'who',
[(b'WWW-Authenticate', b'Basic Realm="mercurial"')],
)
if base64.b64decode(auth.split()[1]).split(b':', 1) != [b'user', b'pass']:
raise common.ErrorResponse(common.HTTP_FORBIDDEN, b'no')
def extsetup(ui):
common.permhooks.insert(0, perform_authentication)
digest.adduser(b'user', b'pass', b'mercurial')