[feat] add key expiry date extension in keymanager

- extends key pair (unlocked from soledad)
- extension period is counted from key creation date

4 files changed, 133 insertions, 2 deletions

diff --git a/src/leap/bitmask/keymanager/__init__.py b/src/leap/bitmask/keymanager/__init__.py
index e3ff3b87..03ade634 100644
--- a/src/leap/bitmask/keymanager/__init__.py
+++ b/src/leap/bitmask/keymanager/__init__.py
@@ -38,7 +38,6 @@ from leap.bitmask.keymanager.openpgp import OpenPGPScheme
 
 
 class KeyManager(object):
-
     #
     # server's key storage constants
     #
@@ -110,7 +109,7 @@ class KeyManager(object):
         leap_ca_bundle = ca_bundle.where()
 
         if self._ca_cert_path == leap_ca_bundle:
-            return self._ca_cert_path   # don't merge file with itself
+            return self._ca_cert_path  # don't merge file with itself
         elif not self._ca_cert_path:
             return leap_ca_bundle
 
@@ -711,6 +710,26 @@ class KeyManager(object):
         pubkey.validation = validation
         yield self.put_key(pubkey)
 
+    @defer.inlineCallbacks
+    def extend_key(self, validity='1y', passphrase=None):
+        """
+        extend the expiration date of the key pair bound to the user's address
+        by the validity period, from the key's creation date.
+
+        :param validity: new validity from creation date 'n','nw','nm' or 'ny'
+                        where n is a number
+        :type validity: str
+
+        :return: The updated secret key, with new expiry date
+        :rtype: OpenPGPKey
+
+        :raise KeyExpiryExtensionError: if invalid validity period
+        """
+        my_secret_key = yield self.get_key(self._address, private=True)
+        renewed_key = yield self._openpgp.extend_key(my_secret_key, validity,
+                                                     passphrase)
+        defer.returnValue(renewed_key)
+
 
 def _split_email(address):
     """
diff --git a/src/leap/bitmask/keymanager/errors.py b/src/leap/bitmask/keymanager/errors.py
index dfff3936..1ca234de 100644
--- a/src/leap/bitmask/keymanager/errors.py
+++ b/src/leap/bitmask/keymanager/errors.py
@@ -88,6 +88,12 @@ class GPGError(Exception):
     pass
 
 
+class KeyExpiryExtensionError(Exception):
+    """
+    Error during key expiry date extension
+    """
+
+
 class SignFailed(Exception):
     """
     Raised when failed to sign.
diff --git a/src/leap/bitmask/keymanager/openpgp.py b/src/leap/bitmask/keymanager/openpgp.py
index a27eb3de..99e5bc72 100644
--- a/src/leap/bitmask/keymanager/openpgp.py
+++ b/src/leap/bitmask/keymanager/openpgp.py
@@ -617,6 +617,47 @@ class OpenPGPScheme(object):
                 raise errors.EncryptError()
 
     @defer.inlineCallbacks
+    def extend_key(self, seckey, validity='1y', passphrase=None):
+        """
+        Extend C{key} key pair, expiration date for C{validity} period,
+        from its creation date.
+
+        :param seckey: The secret key of the key pair to be extended.
+        :type seckey: OpenPGPKey
+        :param validity: new validity from creation date 'n','nw','nm' or 'ny'
+                         where n is a number
+        :type validity: str
+
+        :return: The updated secret key, with new expiry date
+        :rtype: OpenPGPKey
+
+        :raise KeyExpiryExtensionError: Raised if failed to extend key
+                                        for some reason.
+        """
+        leap_assert_type(seckey, OpenPGPKey)
+        leap_assert(seckey.private is True, 'Key is not private.')
+        keys = [seckey]
+        try:
+            with TempGPGWrapper(keys, self._gpgbinary) as gpg:
+                result = yield from_thread(gpg.extend_key, seckey.address,
+                                           validity=validity,
+                                           passphrase=passphrase)
+                if result.status == 'ok':
+                    for secret in [False, True]:
+                        fetched_key = gpg.list_keys(secret=secret).pop()
+                        key_data = gpg.export_keys(seckey.fingerprint,
+                                                   secret=secret)
+                        renewed_key = self._build_key_from_gpg(
+                            fetched_key,
+                            key_data,
+                            seckey.address)
+                        yield self.put_key(renewed_key)
+                    defer.returnValue(renewed_key)
+        except Exception as e:
+            logger.warn('Failed to Extend Key: %s expiration date.' % str(e))
+            raise errors.KeyExpiryExtensionError(str(e))
+
+    @defer.inlineCallbacks
     def decrypt(self, data, privkey, passphrase=None, verify=None):
         """
         Decrypt C{data} using private @{privkey} and verify with C{verify} key.
diff --git a/src/leap/bitmask/keymanager/testing/__init__.py b/src/leap/bitmask/keymanager/testing/__init__.py
index 63ccf50a..192c7d9b 100644
--- a/src/leap/bitmask/keymanager/testing/__init__.py
+++ b/src/leap/bitmask/keymanager/testing/__init__.py
@@ -237,6 +237,71 @@ THx7N776fcYHGumbqUMYrxrcZSbNveE6SaK8fphRam1dewM0
 -----END PGP PRIVATE KEY BLOCK-----
 """
 
+# key with expiry date, change if key below is changed
+ADDRESS_EXPIRING = 'leap.expiring@leap.se'
+KEY_EXPIRING_CREATION_DATE = '2016-11-06'
+
+PRIVATE_EXPIRING_KEY = """
+-----BEGIN PGP PRIVATE KEY BLOCK-----
+Version: GnuPG v1
+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+QoUpBADIAcP+oAllPbsuFMsPOMQVzC6oqSf/HlsbRn3oQMKrP/Pa4ZsbW7i2FkKB
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+JfWPBQqMwc5KLqFlXB0XQajdf0vxnnbbgK/Sbssntg==
+=2Zjl
+-----END PGP PRIVATE KEY BLOCK-----
+"""
+
 
 class KeyManagerWithSoledadTestCase(unittest.TestCase, BaseLeapTest):