Merge pull request #527 from YunoHost/migrate-pwd

Synchronize root and admin password

data/actionsmap/yunohost.yml

@@ -1446,7 +1446,7 @@ tools:
 
         ### tools_adminpw()
         adminpw:
-            action_help: Change admin password
+            action_help: Change password of admin and root users
             api: PUT /adminpw
             configuration:
                 authenticate: all

locales/en.json

@@ -273,6 +273,7 @@
     "migration_description_0003_migrate_to_stretch": "Upgrade the system to Debian Stretch and YunoHost 3.0",
     "migration_description_0004_php5_to_php7_pools": "Reconfigure the PHP pools to use PHP 7 instead of 5",
     "migration_description_0005_postgresql_9p4_to_9p6": "Migrate databases from postgresql 9.4 to 9.6",
+    "migration_description_0006_sync_admin_and_root_passwords": "Synchronize admin and root passwords",
     "migration_0003_backward_impossible": "The stretch migration cannot be reverted.",
     "migration_0003_start": "Starting migration to Stretch. The logs will be available in {logfile}.",
     "migration_0003_patching_sources_list": "Patching the sources.lists ...",
@@ -289,6 +290,8 @@
     "migration_0005_postgresql_94_not_installed": "Postgresql was not installed on your system. Nothing to do!",
     "migration_0005_postgresql_96_not_installed": "Postgresql 9.4 has been found to be installed, but not postgresql 9.6 !? Something weird might have happened on your system :( ...",
     "migration_0005_not_enough_space": "Not enough space is available in {path} to run the migration right now :(.",
+    "migration_0006_disclaimer": "Yunohost now expects admin and root passwords to be synchronized. By running this migration, your root password is going to be replaced by the admin password.",
+    "migration_0006_done": "Your root password have been replaced by your admin password.",
     "migrations_backward": "Migrating backward.",
     "migrations_bad_value_for_target": "Invalid number for target argument, available migrations numbers are 0 or {}",
     "migrations_cant_reach_migration_file": "Can't access migrations files at path %s",
@@ -371,6 +374,7 @@
     "restore_running_app_script": "Running restore script of app '{app:s}'...",
     "restore_running_hooks": "Running restoration hooks...",
     "restore_system_part_failed": "Unable to restore the '{part:s}' system part",
+    "root_password_desynchronized": "The admin password has been changed, but YunoHost was unable to propagate this on the root password !",
     "server_shutdown": "The server will shutdown",
     "server_shutdown_confirm": "The server will shutdown immediatly, are you sure? [{answers:s}]",
     "server_reboot": "The server will reboot",

src/yunohost/data_migrations/0006_sync_admin_and_root_passwords.py

@@ -0,0 +1,79 @@
+import spwd
+import crypt
+import random
+import string
+import subprocess
+
+from moulinette import m18n
+from moulinette.core import MoulinetteError
+from moulinette.utils.log import getActionLogger
+from moulinette.utils.process import run_commands, check_output
+from moulinette.utils.filesystem import append_to_file
+from moulinette.authenticators.ldap import Authenticator
+from yunohost.tools import Migration
+
+logger = getActionLogger('yunohost.migration')
+SMALL_PWD_LIST = ["yunohost", "olinuxino", "olinux", "raspberry", "admin", "root", "test", "rpi"]
+
+class MyMigration(Migration):
+    "Synchronize admin and root passwords"
+
+    def migrate(self):
+
+        new_hash = self._get_admin_hash()
+        self._replace_root_hash(new_hash)
+
+        logger.info(m18n.n("migration_0006_done"))
+
+    def backward(self):
+        pass
+
+    @property
+    def mode(self):
+
+        # If the root password is still a "default" value,
+        # then this is an emergency and migration shall
+        # be applied automatically
+        #
+        # Otherwise, as playing with root password is touchy,
+        # we set this as a manual migration.
+        return "auto" if self._is_root_pwd_listed(SMALL_PWD_LIST) else "manual"
+
+    @property
+    def disclaimer(self):
+        if self._is_root_pwd_listed(SMALL_PWD_LIST):
+            return None
+
+        return m18n.n("migration_0006_disclaimer")
+
+    def _get_admin_hash(self):
+        """
+        Fetch the admin hash from the LDAP db using slapcat
+        """
+        admin_hash = check_output("slapcat \
+            | grep 'dn: cn=admin,dc=yunohost,dc=org' -A20 \
+            | grep userPassword -A2 \
+            | tr -d '\n ' \
+            | tr ':' ' ' \
+            | awk '{print $2}' \
+            | base64 -d \
+            | sed 's/{CRYPT}//g'")
+        return admin_hash
+
+    def _replace_root_hash(self, new_hash):
+        hash_root = spwd.getspnam("root").sp_pwd
+
+        with open('/etc/shadow', 'r') as before_file:
+            before = before_file.read()
+
+        with open('/etc/shadow', 'w') as after_file:
+            after_file.write(before.replace("root:" + hash_root,
+                                            "root:" + new_hash))
+
+    def _is_root_pwd_listed(self, pwd_list):
+        hash_root = spwd.getspnam("root").sp_pwd
+
+        for password in pwd_list:
+            if hash_root == crypt.crypt(password, hash_root):
+                return True
+        return False

src/yunohost/tools.py

@@ -129,18 +129,32 @@ def tools_adminpw(auth, new_password):
     """
     from yunohost.user import _hash_user_password
     from yunohost.utils.password import assert_password_is_strong_enough
+    import spwd
     
     assert_password_is_strong_enough("admin", new_password)
     
+    new_hash = _hash_user_password(new_password)
+
     try:
-        auth.update("cn=admin", {
-            "userPassword": _hash_user_password(new_password),
-        })
+        auth.update("cn=admin", { "userPassword": new_hash, })
     except:
         logger.exception('unable to change admin password')
         raise MoulinetteError(errno.EPERM,
                               m18n.n('admin_password_change_failed'))
     else:
+        # Write as root password
+        try:
+            hash_root = spwd.getspnam("root").sp_pwd
+
+            with open('/etc/shadow', 'r') as before_file:
+                before = before_file.read()
+
+            with open('/etc/shadow', 'w') as after_file:
+                after_file.write(before.replace("root:" + hash_root,
+                                                "root:" + new_hash.replace('{CRYPT}', '')))
+        except IOError as e:
+            logger.warning(m18n.n('root_password_desynchronized'))
+            return
         logger.success(m18n.n('admin_password_changed'))