add rds_pg feature

README.md

@@ -168,6 +168,46 @@ For bash based builds we support often used script-parts as predefined functions
 
 A full working example: [doc/example/50_docker_module](doc/example/50_docker_module)
 
+## Feature AwsRdsPgMixin
+
+The AwsRdsPgMixin provides 
+* execute_pg_rds_sql - function will optionally resolve dns-c-names for trusted ssl-handshakes
+* alter_db_user_password
+* add_new_user
+* deactivate_user
+
+the build.py file content:
+```
+class MyBuild(..., AwsRdsPgMixin):
+    pass
+
+
+@init
+def initialize(project):
+    project.build_depends_on('ddadevops>=0.8.0')
+
+    ...
+    config = add_aws_rds_pg_mixin_config(config,
+                                         stage + "-db.bcsimport.kauf." + account_name + ".breuni.de",
+                                         "kauf_bcsimport",
+                                         rds_resolve_dns=True,)
+    build = MyBuild(project, config)
+    build.initialize_build_dir()
+
+@task
+def rotate_credentials_in(project):
+    build = get_devops_build(project)
+    build.alter_db_user_password('/postgres/support')
+    build.alter_db_user_password('/postgres/superuser')
+    build.add_new_user('/postgres/superuser', '/postgres/app', 'pg_group_role')
+
+
+@task
+def rotate_credentials_out(project):
+    build = get_devops_build(project)
+    build.deactivate_user('/postgres/superuser', 'old_user_name')
+```
+
 # Releasing and updating
 ## Publish snapshot
 

build.py

@@ -28,7 +28,7 @@ use_plugin("python.distutils")
 default_task = "publish"
 
 name = "ddadevops"
-version = "0.7.2.dev"
+version = "0.8.0"
 summary = "tools to support builds combining gopass, terraform, dda-pallet, aws & hetzner-cloud"
 description = __doc__
 authors = [Author("meissa GmbH", "buero@meissa-gmbh.de")]

src/main/python/ddadevops/__init__.py

@@ -11,6 +11,7 @@ from .devops_docker_build import DevopsDockerBuild, create_devops_docker_build_c
 from .hetzner_mixin import HetznerMixin, add_hetzner_mixin_config
 from .aws_backend_properties_mixin import AwsBackendPropertiesMixin, add_aws_backend_properties_mixin_config
 from .aws_mfa_mixin import AwsMfaMixin, add_aws_mfa_mixin_config
+from .aws_rds_pg_mixin import AwsRdsPgMixin, add_aws_rds_pg_mixin_config
 from .dda_tenant_mixin import DdaTenantMixin, add_dda_tenant_mixin_config
 from .dda_simple_mixin import DdaSimpleMixin, add_dda_simple_mixin_config
 

src/main/python/ddadevops/aws_mfa_mixin.py

@@ -1,12 +1,12 @@
 from python_terraform import *
 from boto3 import *
-from .credential import gopass_credential_from_env_path
 from .python_util import execute
 from .aws_backend_properties_mixin import AwsBackendPropertiesMixin
 
 
 def add_aws_mfa_mixin_config(config, account_id, region,
-mfa_role='developer', mfa_account_prefix='', mfa_login_account_suffix='main'):
+                             mfa_role='developer', mfa_account_prefix='', 
+                             mfa_login_account_suffix='main'):
     config.update({'AwsMfaMixin':
                    {'account_id': account_id,
                     'region': region,

src/main/python/ddadevops/aws_rds_pg_mixin.py

@@ -0,0 +1,90 @@
+from .python_util import execute
+from .credential import gopass_password_from_path, gopass_field_from_path
+from .devops_build import DevopsBuild
+
+
+def add_aws_rds_pg_mixin_config(config, rds_host_name, db_name,
+                                rds_resolve_dns=False,
+                                db_port='5432'):
+    config.update({'AwsRdsPgMixin':
+                   {'rds_host_name': rds_host_name,
+                    'db_name': db_name,
+                    'rds_resolve_dns': rds_resolve_dns,
+                    'db_port': db_port,
+                    }})
+    return config
+
+
+class AwsRdsPgMixin(DevopsBuild):
+
+    def __init__(self, project, config):
+        super().__init__(project, config)
+        aws_rds_pg_mixin_config = config['AwsRdsPgMixin']
+        self.rds_host_name = aws_rds_pg_mixin_config['rds_host_name']
+        self.rds_resolve_dns = aws_rds_pg_mixin_config['rds_resolve_dns']
+        self.db_name = aws_rds_pg_mixin_config['db_name']
+        self.db_port = aws_rds_pg_mixin_config['db_port']
+
+    def execute_pg_rds_sql(self, user, password, sql):
+        if self.rds_resolve_dns:
+            host_cmd = "dig " + self.rds_host_name + " +short | head -n1"
+            host = execute(host_cmd, shell=True)
+        else:
+            host = self.rds_host_name
+
+        cmd = "PGUSER=" + user + " PGPASSWORD=" + password + \
+            " psql --dbname=" + self.db_name + " --host=" + host + " --port=" + self.db_port + \
+            " --set=sslmode=require -Atc \"" + sql + "\""
+        result = execute(cmd, shell=True)
+        print("PSQL: ", host, result.rstrip())
+        return result
+
+    def alter_db_user_password(self, gopass_path):
+        user_name = gopass_field_from_path(
+            self.gopass_stage() + gopass_path, 'user')
+        user_old_password = gopass_field_from_path(
+            self.gopass_stage() + gopass_path, 'old-password')
+        user_new_password = gopass_password_from_path(
+            self.gopass_stage() + gopass_path)
+
+        self.execute_pg_rds_sql(user_name, user_old_password,
+                                "ALTER ROLE " + user_name + " WITH PASSWORD '" + user_new_password + "';")
+        print("changed password:", self.gopass_stage(), ',', user_name)
+
+    def add_new_user(self, gopass_path_superuser, gopass_path_new_user, group_role):
+        superuser_name = gopass_field_from_path(
+            self.gopass_stage() + gopass_path_superuser, 'user')
+        superuser_password = gopass_password_from_path(
+            self.gopass_stage() + gopass_path_superuser)
+        new_user_name = gopass_field_from_path(
+            self.gopass_stage() + gopass_path_new_user, 'user')
+        new_user_password = gopass_password_from_path(
+            self.gopass_stage() + gopass_path_new_user)
+
+        self.execute_pg_rds_sql(superuser_name, superuser_password,
+                                "CREATE ROLE " + new_user_name + " WITH LOGIN INHERIT PASSWORD '" + new_user_password + "';" +
+                                "GRANT " + group_role + " TO " + new_user_name + ";")
+        print("created user:", self.gopass_stage(), ',', new_user_name)
+
+    def deactivate_user(self, gopass_path_superuser, to_remove_user_name):
+        superuser_name = gopass_field_from_path(
+            self.gopass_stage() + gopass_path_superuser, 'user')
+        superuser_password = gopass_password_from_path(
+            self.gopass_stage() + gopass_path_superuser)
+
+        owned_by_wrong_user = self.execute_pg_rds_sql(superuser_name, superuser_password,
+                                                      "SELECT count(*) FROM pg_class c, pg_user u WHERE c.relowner = u.usesysid " +
+                                                      "and u.usename='" + to_remove_user_name + "';")
+        if int(owned_by_wrong_user) > 0:
+            raise AssertionError(
+                "There are still objects owned by the user to be deleted.")
+
+        connections = self.execute_pg_rds_sql(superuser_name, superuser_password,
+                                              "SELECT count(*) FROM pg_stat_activity WHERE application_name = " +
+                                              "'PostgreSQL JDBC Driver' AND usename = '" + to_remove_user_name + "';")
+        if int(connections) > 0:
+            raise AssertionError("User is still connected.")
+
+        self.execute_pg_rds_sql(superuser_name, superuser_password,
+                                "ALTER ROLE " + to_remove_user_name + " WITH NOLOGIN NOCREATEROLE;")
+        print('deactivated user:', to_remove_user_name)