bundle-spec: properly identify changegroup-less bundle
It is possible to produce a bundle without changegroup. For example if we want
to only send phases or obsolescence information. However that lead to crash for
command that identifies bundle content. So we fix that.
The test will come in the next changesets, when we fix another bug preventing to
generate such bundle by hand.
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')