4 files changed, 57 insertions, 3 deletions
diff --git a/src/leap/bitmask/bonafide/_protocol.py b/src/leap/bitmask/bonafide/_protocol.py
index ff357a1..7917f38 100644
--- a/src/leap/bitmask/bonafide/_protocol.py
+++ b/src/leap/bitmask/bonafide/_protocol.py
@@ -147,6 +147,18 @@ class BonafideProtocol(object):
         d.addCallback(lambda _: '%s logged out' % full_id)
         return d
 
+    def do_change_password(self, full_id, current_password, new_password):
+        log.msg('Change password for %s' % full_id)
+        if (full_id not in self._sessions or
+                not self._sessions[full_id].is_authenticated):
+            return fail(RuntimeError("There is no session for such user"))
+        session = self._sessions[full_id]
+
+        if current_password != session.password:
+            return fail(RuntimeError("The current password is not valid"))
+
+        return session.change_password(new_password)
+
     def do_get_provider(self, provider_id, autoconf=False):
         provider = config.Provider(provider_id, autoconf=autoconf)
         return provider.callWhenMainConfigReady(provider.config)
diff --git a/src/leap/bitmask/bonafide/_srp.py b/src/leap/bitmask/bonafide/_srp.py
index b0dd83f..34a75a5 100644
--- a/src/leap/bitmask/bonafide/_srp.py
+++ b/src/leap/bitmask/bonafide/_srp.py
@@ -101,9 +101,7 @@ class SRPSignupMechanism(object):
     """
 
     def get_signup_params(self, username, password):
-        salt, verifier = srp.create_salted_verification_key(
-            bytes(username), bytes(password),
-            srp.SHA256, srp.NG_1024)
+        salt, verifier = _get_salt_verifier(username, password)
         user_data = {
             'user[login]': username,
             'user[password_salt]': binascii.hexlify(salt),
@@ -121,6 +119,25 @@ class SRPSignupMechanism(object):
             return username
 
 
+class SRPPasswordChangeMechanism(object):
+
+    """
+    Implement a protocol-agnostic SRP passord change mechanism.
+    """
+
+    def get_password_params(self, username, password):
+        salt, verifier = _get_salt_verifier(username, password)
+        user_data = {
+            'user[password_salt]': binascii.hexlify(salt),
+            'user[password_verifier]': binascii.hexlify(verifier)}
+        return user_data
+
+
+def _get_salt_verifier(username, password):
+    return srp.create_salted_verification_key(bytes(username), bytes(password),
+                                              srp.SHA256, srp.NG_1024)
+
+
 def _safe_unhexlify(val):
     return binascii.unhexlify(val) \
         if (len(val) % 2 == 0) else binascii.unhexlify('0' + val)
diff --git a/src/leap/bitmask/bonafide/service.py b/src/leap/bitmask/bonafide/service.py
index 5e3b0f1..797e606 100644
--- a/src/leap/bitmask/bonafide/service.py
+++ b/src/leap/bitmask/bonafide/service.py
@@ -103,6 +103,17 @@ class BonafideService(HookableService):
         d.addCallback(lambda response: {'logout': 'ok'})
         return d
 
+    def do_change_password(self, username, current_password, new_password):
+        def notify_passphrase_change(_):
+            data = dict(username=username, password=new_password)
+            self.trigger_hook('on_passphrase_change', **data)
+
+        d = self._bonafide.do_change_password(username, current_password,
+                                              new_password)
+        d.addCallback(notify_passphrase_change)
+        d.addCallback(lambda _: {'update': 'ok'})
+        return d
+
     def do_provider_create(self, domain):
         return self._bonafide.do_get_provider(domain, autoconf=True)
 
diff --git a/src/leap/bitmask/bonafide/session.py b/src/leap/bitmask/bonafide/session.py
index f25fa05..abb697a 100644
--- a/src/leap/bitmask/bonafide/session.py
+++ b/src/leap/bitmask/bonafide/session.py
@@ -66,6 +66,7 @@ class Session(object):
         password = self.password or ''
         self._srp_auth = _srp.SRPAuthMechanism(username, password)
         self._srp_signup = _srp.SRPSignupMechanism()
+        self._srp_password = _srp.SRPPasswordChangeMechanism()
         self._token = None
         self._uuid = None
 
@@ -123,6 +124,19 @@ class Session(object):
         self._initialize_session()
         defer.returnValue(OK)
 
+    @_auth_required
+    @defer.inlineCallbacks
+    def change_password(self, password):
+        uri = self._api.get_update_user_uri(uid=self._uuid)
+        met = self._api.get_update_user_method()
+        params = self._srp_password.get_password_params(
+            self.username, password)
+        update = yield self._request(self._agent, uri, values=params,
+                                     method=met)
+        self.password = password
+        self._srp_auth = _srp.SRPAuthMechanism(self.username, password)
+        defer.returnValue(OK)
+
     # User certificates
 
     def get_vpn_cert(self):