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Clearsign authorisation via subkey.

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Replacement code which might work to enable advanced keys with signing
subkeys to be correctly handled by the bot by associating the subkey
with the relevant master key.

Signing format still only clearsigning, the key details are more
important and auth via encrypted token and decryption is likely to be
more reliable anyway as there is far less chance of some other protocol
messing with the signed content.  Effectively no chance, though the odd
corrupted packet here and there is still possible.  Whereas with
clearsigning it can be broken by all manner of rewriting in
transit (which happens often enough with signed email as it is).

See also Issue #1045 for greater detail of what needs to be fixed and
what is to be done about it.
This commit is contained in:
Ben McGinnes 2015-02-06 18:11:52 +11:00
parent b0db845604
commit 720b299e82
1 changed files with 46 additions and 10 deletions
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56
plugins/User/plugin.py
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@ -500,6 +500,7 @@ class User(callbacks.Plugin):
r'-----BEGIN PGP SIGNATURE-----\r?\n.*'
r'\r?\n-----END PGP SIGNATURE-----',
re.S)
@internationalizeDocstring
def auth(self, irc, msg, args, url):
"""<url>
@ -524,20 +525,55 @@ class User(callbacks.Plugin):
verified = gpg.keyring.verify(data)
if verified and verified.valid:
keyid = verified.key_id
fprint = verified.pubkey_fingerprint
kprint = fprint[-16:]
prefix, expiry = self._tokens.pop(token)
found = False
for (id, user) in ircdb.users.items():
if keyid in [x[-len(keyid):] for x in user.gpgkeys]:
try:
user.addAuth(msg.prefix)
except ValueError:
irc.error(_('Your secure flag is true and your '
'hostmask doesn\'t match any of your '
'known hostmasks.'), Raise=True)
pkeys = gpg.list_keys(False)
pnum = len(pkeys)
for x in range(pnum):
if keyid or kprint in pkeys[x]["keyid"] and keyid in user.gpgkeys and if keyid is kprint:
user.addAuth(msg.prefix)
ircdb.users.setUser(user, flush=False)
irc.reply(_('You are now authenticated as %s.') %
user.name)
irc.reply(_('You are now authenticated as %s with %s.')
% (user.name, keyid))
return
elif keyid or kprint in pkeys[x]["keyid"] and keyid not in user.gpgkeys and kprint is in user.gpgkeys and keyid is not kprint:
user.addAuth(msg.prefix)
ircdb.users.setUser(user, flush=False)
irc.reply(_('You are now authenticated as %s with %s using the %s subkey.')
% (user.name, keyid, kprint))
return
elif keyid or kprint in pkeys[x]["keyid"] and keyid is kprint and keyid not in user.gpgkeys:
irc.error(_('I have a record of key %s, but it is not associated with the %s account.') % (keyid, user.name))
return
elif keyid or kprint in pkeys[x]["keyid"] and keyid is not kprint and keyid not in user.gpgkeys and kprint not in user.gpgkeys:
irc.error(_('I have a record of key %s, but it is not associated with any account.') % (keyid))
return
elif keyid is kprint and keyid not in pkeys[x]["keyid"] and keyid in user.gpgkeys:
irc.error(_('The %s key is registered to the %s account, but not currently available to me. Please add the key again') % (keyid, user.name))
# Possibly replace this with key retrieval attempt.
# try:
# code to retrieve key from server
# except AnErrorOfSomeKind:
# the current error message.
return
elif keyid and kprint not in pkeys[x]["keyid"] and keyid is not kprint and keyid not in user.gpgkeys and kprint not in user.gpgkeys:
irc.error(_('Unknown GPG key.'), Raise=True)
return
#for (id, user) in ircdb.users.items():
# if keyid in [x[-len(keyid):] for x in user.gpgkeys]:
# user.addAuth(msg.prefix)
# try:
# user.addAuth(msg.prefix)
# except ValueError:
# irc.error(_('Your secure flag is true and your '
# 'hostmask doesn\'t match any of your '
# 'known hostmasks.'), Raise=True)
# ircdb.users.setUser(user, flush=False)
# irc.reply(_('You are now authenticated as %s.') %
# user.name)
# return
irc.error(_('Unknown GPG key.'), Raise=True)
else:
irc.error(_('Signature could not be verified. Make sure '