Fixes #5676 disable v2 onion addresses on restore on Focal

We filter out any v2 onion address related line from /etc/tor/torrc
and also the directories from /var/lib/tor/services. This will
happen only on Focal. On Xenial, everything stays the same.

install_files/ansible-base/roles/restore/files/disable_v2.py

@@ -0,0 +1,68 @@
+#!/usr/bin/env python3
+# To execute on prod:
+# python3 disable_v2.py /etc/tor/torrc /etc/tor/torrc
+# To execute for testing locally:
+# python3 disable_v2.py /etc/tor/torrc /tmp/dumytorrc
+import sys
+
+
+def filter_v2(filename):
+    # Read the file
+    with open(filename) as f:
+        data = f.readlines()
+    # We will store the filtered lines to result
+    result = []
+
+    i = 0
+    while i < len(data):
+        line = data[i]
+        if line == "HiddenServiceDir /var/lib/tor/services/source\n":
+            i += 1
+            while data[i].strip() == "":
+                i += 1
+            line = data[i]
+            if line == "HiddenServiceVersion 2\n":
+                i += 1
+                line = data[i]
+                while data[i].strip() == "":
+                    i += 1
+                line = data[i]
+                if line == "HiddenServicePort 80 127.0.0.1:80\n":
+                    i += 1
+                    continue
+        # Now check for journalist
+        if line == "HiddenServiceDir /var/lib/tor/services/journalist\n":
+            i += 1
+            while data[i].strip() == "":
+                i += 1
+            line = data[i]
+            if line == "HiddenServiceVersion 2\n":
+                i += 1
+                line = data[i]
+                while data[i].strip() == "":
+                    i += 1
+                line = data[i]
+                if line == "HiddenServicePort 80 127.0.0.1:8080\n":
+                    i += 1
+                    line = data[i]
+                    while data[i].strip() == "":
+                        i += 1
+                    line = data[i]
+                    if line == "HiddenServiceAuthorizeClient stealth journalist\n":
+                        i += 1
+                        continue
+
+        result.append(line)
+        i += 1
+
+    # Now return the result
+    return result
+
+
+if __name__ == "__main__":
+    filename = sys.argv[1]
+    outputfilename = sys.argv[2]
+    result = filter_v2(filename)
+    with open(outputfilename, "w") as fobj:
+        for line in result:
+            fobj.write(line)

install_files/ansible-base/roles/restore/tasks/main.yml

@@ -73,6 +73,34 @@
     name: apache2
     state: reloaded
 
+- name: Copy disable_v2.py script for Focal
+  copy:
+    src: "{{ role_path }}/files/disable_v2.py"
+    dest: /opt/disable_v2.py
+  when: ansible_distribution_release == 'focal'
+
+- name: Execute disable_v2 script on Focal
+  command: python3 /opt/disable_v2.py /etc/tor/torrc /etc/tor/torrc
+  when: ansible_distribution_release == 'focal'
+
+- name: Remove v2 tor source directory
+  file:
+    state: absent
+    path: /var/lib/tor/services/source
+  when: ansible_distribution_release == 'focal'
+
+- name: Remove v2 tor journalist directory
+  file:
+    state: absent
+    path: /var/lib/tor/services/journalist
+  when: ansible_distribution_release == 'focal'
+
+- name: Remove disable_v2.py script on Focal
+  file:
+    state: absent
+    path: /opt/disable_v2.py
+  when: ansible_distribution_release == 'focal'
+
 - name: Reload Tor service
   service:
     name: tor