fix broken ssh public key handling

- make sure that AddSshPublicKeyForm does not try to parse the key if it is
  None
- split the key text into a maximum of 3 parts to allow whitespace in comments
- update changelog

docs/changelog.rst

@@ -1,6 +1,7 @@
 Changelog
 =========
 
+* :bug:`-` fix handling of OpenSSH formatted keys with whitespace in comments
 * :bug:`-` the ssh key list does not show SSH keys of other users anymore
 
 * :release:`0.11.2 <2015-02-06>`

gnuviechadmin/osusers/forms.py

@@ -85,14 +85,15 @@ class AddSshPublicKeyForm(forms.ModelForm):
 
     def clean(self):
         keytext = self.cleaned_data.get('publickeytext')
-        alg, data, comment = SshPublicKey.objects.parse_keytext(keytext)
-        if SshPublicKey.objects.filter(
-            user=self.osuser, algorithm=alg, data=data
-        ).exists():
-            self.add_error(
-                'publickeytext',
-                forms.ValidationError(DUPLICATE_SSH_PUBLIC_KEY_FOR_USER)
-            )
+        if keytext is not None:
+            alg, data, comment = SshPublicKey.objects.parse_keytext(keytext)
+            if SshPublicKey.objects.filter(
+                user=self.osuser, algorithm=alg, data=data
+            ).exists():
+                self.add_error(
+                    'publickeytext',
+                    forms.ValidationError(DUPLICATE_SSH_PUBLIC_KEY_FOR_USER)
+                )
 
     def save(self, commit=True):
         """

gnuviechadmin/osusers/models.py

@@ -528,9 +528,9 @@ class SshPublicKeyManager(models.Manager):
             if 'comment' in headers:
                 comment = headers['comment']
         else:
-            parts = keytext.split()
-            if len(parts) > 3:
-                raise ValueError("unsupported key format")
+            parts = keytext.split(None, 2)
+            if len(parts) < 2:
+                raise ValueError('invalid SSH public key')
             data = parts[1]
             comment = len(parts) == 3 and parts[2] or ""
         keybytes = base64.b64decode(data)