backend (currently json).
"""
+# pylint: disable=C0103
+
+# C0103: Invalid name, since pylint doesn't see that Dump points to a
+# function and not a constant
-import simplejson
import re
-import hmac
-from ganeti import errors
+# Python 2.6 and above contain a JSON module based on simplejson. Unfortunately
+# the standard library version is significantly slower than the external
+# module. While it should be better from at least Python 3.2 on (see Python
+# issue 7451), for now Ganeti needs to work well with older Python versions
+# too.
+import simplejson
-try:
- from hashlib import sha1
-except ImportError:
- import sha as sha1
+from ganeti import errors
+from ganeti import utils
-# Check whether the simplejson module supports indentation
-_JSON_INDENT = 2
-try:
- simplejson.dumps(1, indent=_JSON_INDENT)
-except TypeError:
- _JSON_INDENT = None
-_RE_EOLSP = re.compile('[ \t]+$', re.MULTILINE)
+_RE_EOLSP = re.compile("[ \t]+$", re.MULTILINE)
-def DumpJson(data, indent=True):
+def DumpJson(data):
"""Serialize a given object.
@param data: the data to serialize
- @param indent: whether to indent output (depends on simplejson version)
-
@return: the string representation of data
"""
- if not indent or _JSON_INDENT is None:
- txt = simplejson.dumps(data)
- else:
- txt = simplejson.dumps(data, indent=_JSON_INDENT)
+ encoded = simplejson.dumps(data)
+
+ txt = _RE_EOLSP.sub("", encoded)
+ if not txt.endswith("\n"):
+ txt += "\n"
- txt = _RE_EOLSP.sub("", txt)
- if not txt.endswith('\n'):
- txt += '\n'
return txt
return simplejson.loads(txt)
-def DumpSignedJson(data, key, salt=None):
+def DumpSignedJson(data, key, salt=None, key_selector=None):
"""Serialize a given object and authenticate it.
@param data: the data to serialize
@param key: shared hmac key
+ @param key_selector: name/id that identifies the key (in case there are
+ multiple keys in use, e.g. in a multi-cluster environment)
@return: the string representation of data signed by the hmac key
"""
- txt = DumpJson(data, indent=False)
+ txt = DumpJson(data)
if salt is None:
- salt = ''
+ salt = ""
signed_dict = {
- 'msg': txt,
- 'salt': salt,
- 'hmac': hmac.new(key, salt + txt, sha1).hexdigest(),
- }
- return DumpJson(signed_dict, indent=False)
+ "msg": txt,
+ "salt": salt,
+ }
+
+ if key_selector:
+ signed_dict["key_selector"] = key_selector
+ else:
+ key_selector = ""
+
+ signed_dict["hmac"] = utils.Sha1Hmac(key, txt, salt=salt + key_selector)
+
+ return DumpJson(signed_dict)
def LoadSignedJson(txt, key):
"""Verify that a given message was signed with the given key, and load it.
@param txt: json-encoded hmac-signed message
- @param key: shared hmac key
+ @param key: the shared hmac key or a callable taking one argument (the key
+ selector), which returns the hmac key belonging to the key selector.
+ Typical usage is to pass a reference to the get method of a dict.
@rtype: tuple of original data, string
@return: original data, salt
@raises errors.SignatureError: if the message signature doesn't verify
"""
signed_dict = LoadJson(txt)
if not isinstance(signed_dict, dict):
- raise errors.SignatureError('Invalid external message')
+ raise errors.SignatureError("Invalid external message")
try:
- msg = signed_dict['msg']
- salt = signed_dict['salt']
- hmac_sign = signed_dict['hmac']
+ msg = signed_dict["msg"]
+ salt = signed_dict["salt"]
+ hmac_sign = signed_dict["hmac"]
except KeyError:
- raise errors.SignatureError('Invalid external message')
+ raise errors.SignatureError("Invalid external message")
+
+ if callable(key):
+ # pylint: disable=E1103
+ key_selector = signed_dict.get("key_selector", None)
+ hmac_key = key(key_selector)
+ if not hmac_key:
+ raise errors.SignatureError("No key with key selector '%s' found" %
+ key_selector)
+ else:
+ key_selector = ""
+ hmac_key = key
- if hmac.new(key, salt + msg, sha1).hexdigest() != hmac_sign:
- raise errors.SignatureError('Invalid Signature')
+ if not utils.VerifySha1Hmac(hmac_key, msg, hmac_sign,
+ salt=salt + key_selector):
+ raise errors.SignatureError("Invalid Signature")
return LoadJson(msg), salt
+def LoadAndVerifyJson(raw, verify_fn):
+ """Parses and verifies JSON data.
+
+ @type raw: string
+ @param raw: Input data in JSON format
+ @type verify_fn: callable
+ @param verify_fn: Verification function, usually from L{ht}
+ @return: De-serialized data
+
+ """
+ try:
+ data = LoadJson(raw)
+ except Exception, err:
+ raise errors.ParseError("Can't parse input data: %s" % err)
+
+ if not verify_fn(data):
+ raise errors.ParseError("Data does not match expected format: %s" %
+ verify_fn)
+
+ return data
+
+
Dump = DumpJson
Load = LoadJson
DumpSigned = DumpSignedJson