aif-ng/aif/utils/gpg_handler.py

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2019-12-11 04:32:07 -05:00
import copy
import io
import os
import shutil
import tempfile
##
import gpg
import gpg.errors
class GPG(object):
def __init__(self, homedir = None, primary_key = None):
self.homedir = homedir
self.primary_key = primary_key
self.temporary = None
self.gpg = None
self._imported_keys = []
def _initContext(self):
if not self.homedir:
self.homedir = tempfile.mkdtemp(suffix = '.gpg', prefix = '.aif.')
self.homedir = os.path.abspath(os.path.expanduser(self.homedir))
self.temporary = False
if not os.path.isdir(self.homedir):
self.temporary = True
os.makedirs(self.homedir, exist_ok = True)
os.chmod(self.homedir, 0o0700)
self.gpg = gpg.Context(home_dir = self.homedir)
if self.temporary:
self.primary_key = self.createKey('AIF-NG File Verification Key', sign = True, force = True)
else:
self.primary_key = self.getKey(self.primary_key, secret = True)
return(None)
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def clean(self):
# This is mostly just to cleanup the stuff we did before.
self.primary_key = self.primary_key.fpr
if self.temporary:
self.primary_key = None
shutil.rmtree(self.homedir)
self.gpg = None
return(None)
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def createKey(self, userid, *args, **kwargs):
# algorithm=None, expires_in=0, expires=True, sign=False, encrypt=False, certify=False,
# authenticate=False, passphrase=None, force=False
keyinfo = {'userid': userid,
'algorithm': kwargs.get('algorithm', 'rsa4096'),
'expires_in': kwargs.get('expires_in'),
'sign': kwargs.get('sign', True),
'encrypt': kwargs.get('encrypt', False),
'certify': kwargs.get('certify', False),
'authenticate': kwargs.get('authenticate', False),
'passphrase': kwargs.get('passphrase'),
'force': kwargs.get('force')}
if not keyinfo['expires_in']:
del(keyinfo['expires_in'])
keyinfo['expires'] = False
k = self.gpg.create_key(**keyinfo)
return(k.fpr)
def findKey(self, searchstr, secret = False, local = True, remote = True,
secret_only = False, keyring_import = False):
fltr = 0
if secret:
fltr = fltr | gpg.constants.KEYLIST_MODE_WITH_SECRET
if local:
fltr = fltr | gpg.constants.KEYLIST_MODE_LOCAL
if remote:
fltr = fltr | gpg.constants.KEYLIST_MODE_EXTERN
keys = [k for k in self.gpg.keylist(pattern = searchstr, secret = secret_only, mode = fltr)]
if keyring_import:
self.importKeys(keys, native = True)
return(keys)
def getKey(self, key_id, secret = False, strict = False):
try:
getattr(key_id, 'fpr')
return(key_id)
except AttributeError:
if not strict:
self.findKey(key_id, keyring_import = True)
try:
key = self.gpg.get_key(key_id, secret = secret)
except gpg.errors.KeyNotFound:
key = None
return(key)
return(None)
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def getKeyFile(self, keyfile, keyring_import = False):
keyfile = os.path.abspath(os.path.expanduser(keyfile))
with open(keyfile, 'rb') as fh:
rawkey_data = fh.read()
fh.seek(0, 0)
keys = [k for k in self.gpg.keylist(source = fh)]
if keyring_import:
self.importKeys(keys, native = True)
return((keys, rawkey_data))
def getKeyStr(self, keydata, keyring_import = False):
orig_keydata = keydata
if isinstance(keydata, str):
keydata = keydata.encode('utf-8')
buf = io.BytesIO(keydata)
keys = [k for k in self.gpg.keylist(source = buf)]
buf.close()
if keyring_import:
self.importKeys(keys, native = True)
return((keys, orig_keydata))
def importKeys(self, keydata, native = False):
if not native:
self.gpg.key_import(keydata)
else:
if not isinstance(keydata, list):
keydata = [keydata]
self.gpg.op_import_keys(keydata)
return(None)
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def verifyData(self, data, keys = None, strict = False, detached = None, *args, **kwargs):
results = {}
if keys:
if not isinstance(keys, list):
keys = [self.getKey(keys)]
else:
keys = [self.getKey(k) for k in keys]
if isinstance(data, str):
data = data.encode('utf-8')
args = {'signed_data': data}
if detached:
if isinstance(detached, str):
detached = detached.encode('utf-8')
args['signature'] = detached
if strict:
if keys:
if not isinstance(keys, list):
keys = [keys]
args['verify'] = keys
results[None] = self.gpg.verify(**args)
else:
if keys:
for k in keys:
_args = copy.deepcopy(args)
_args['verify'] = [k]
results[k.fpr] = self.gpg.verify(**_args)
else:
results[None] = self.gpg.verify(**args)
return(results)
def verifyFile(self, filepath, *args, **kwargs):
filepath = os.path.abspath(os.path.expanduser(filepath))
with open(filepath, 'rb') as fh:
results = self.verifyData(fh.read(), **kwargs)
return(results)