Merge pull request openwisp#42 from R9295/pass-feature

Added support for passphrase feature.

.travis.yml

@@ -43,6 +43,8 @@ install:
   # TODO: temporary, remove when django-netjsonconfig 0.9.0 is released
   - pip install https://github.com/openwisp/django-netjsonconfig/tarball/master
   - if [[ $TRAVIS_PYTHON_VERSION == "2.7" ]]; then pip install git+git://github.com/tinio/pysqlite.git@extension-enabled#egg=pysqlite; fi
+  # TODO: temporary, remove when django-x509 is released with the passphrase add-on
+  - pip install https://github.com/openwisp/django-x509/tarball/master
 
 script:
   # for some reason the migrations check is failing only on django 2.0

openwisp_controller/pki/migrations/0006_add_x509_passphrase_field.py

@@ -0,0 +1,23 @@
+# Generated by Django 2.0.8 on 2018-09-18 12:41
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pki', '0005_organizational_unit_name'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='ca',
+            name='passphrase',
+            field=models.CharField(blank=True, help_text='Passphrase for the private key, if present', max_length=64),
+        ),
+        migrations.AddField(
+            model_name='cert',
+            name='passphrase',
+            field=models.CharField(blank=True, help_text='Passphrase for the private key, if present', max_length=64),
+        ),
+    ]