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annotate schema/auth.sql @ 180:0423eab4ad45

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Improve RLS policies for template data The removed POLICY manage_templates missed a WITH CHECK (true), because the USING clause is applied to new rows, too, if no WITH CHECK is provided, thus implying a dead-lock situation with the FK constraint on user_templates (the POLICY requiring a row in user_templates while INSERTing such row requires a row in templates). New POLICY on user_templates prevents waterway_admin from relating templates to users from other countries and allows to write other policies more compact.
author Tom Gottfried <tom@intevation.de>
date Tue, 17 Jul 2018 19:08:18 +0200
parents 382f631d8dd8
children 4df4e4bf480e
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1 BEGIN;
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2
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3 --
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4 -- Roles, privileges and policies for the GEMMA database
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5 --
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6 SET search_path TO public, gemma, gemma_waterway, gemma_fairway;
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7
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8 -- We do not want any users to be able to create any objects
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9 REVOKE CREATE ON SCHEMA public FROM PUBLIC;
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10
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11 --
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12 -- Privileges for waterway_user
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13 --
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14 GRANT USAGE ON SCHEMA gemma, gemma_waterway, gemma_fairway TO waterway_user;
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15 GRANT SELECT ON ALL TABLES IN SCHEMA gemma_waterway, gemma_fairway
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16 TO waterway_user;
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17 GRANT SELECT ON templates, user_templates, user_profiles TO waterway_user;
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19 --
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20 -- Extended privileges for waterway_admin
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21 --
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22 GRANT INSERT, UPDATE ON ALL TABLES IN SCHEMA gemma_waterway, gemma_fairway
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23 TO waterway_admin;
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24 -- TODO: will there ever be UPDATEs or can we drop that due to historicisation?
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25 GRANT INSERT, UPDATE, DELETE ON templates, user_templates TO waterway_admin;
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26 GRANT SELECT ON responsibility_areas TO waterway_admin;
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27
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28 --
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29 -- Extended privileges for sys_admin
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30 --
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31 GRANT SELECT, INSERT, UPDATE, DELETE ON ALL TABLES IN SCHEMA gemma
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32 TO sys_admin;
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33
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34 --
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35 -- RLS policies for waterway_user
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36 --
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37 -- Sometimes using FOR ALL because we rely on GRANTed privileges for allowing
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38 -- data modifications generally.
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39 -- Sometimes using 'username IN(SELECT username FROM user_profiles)' instead
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40 -- of 'username = current_user', because waterway_admin is intentionally
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41 -- allowed more with these policies (note that the subselect implies different
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42 -- policies on user_profiles depending on current_user).
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43 --
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44
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45 -- Staging area
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46 CREATE FUNCTION create_hide_staging_policy() RETURNS void AS $$
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47 DECLARE the_table varchar;
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48 BEGIN
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49 FOREACH the_table IN ARRAY ARRAY[
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50 'bottlenecks', 'sounding_results']
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51 -- TODO: add all relevant tables here
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52 LOOP
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53 EXECUTE format('CREATE POLICY hide_staging ON %I '
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54 'FOR SELECT TO waterway_user USING (staging_done)', the_table);
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55 EXECUTE format('ALTER TABLE %I ENABLE ROW LEVEL SECURITY', the_table);
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56 END LOOP;
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57 END;
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58 $$ LANGUAGE plpgsql;
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59 SELECT create_hide_staging_policy();
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60 DROP FUNCTION create_hide_staging_policy;
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61
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62 CREATE POLICY see_yourself ON user_profiles FOR SELECT TO waterway_user
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63 USING (username = current_user);
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64 ALTER TABLE user_profiles ENABLE ROW LEVEL SECURITY;
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65
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66 CREATE POLICY user_templates ON user_templates FOR ALL TO waterway_user
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67 USING (username IN(SELECT username FROM user_profiles));
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68 ALTER TABLE user_templates ENABLE ROW LEVEL SECURITY;
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69
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70 CREATE POLICY user_templates ON templates FOR ALL TO waterway_user
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71 USING (template_name IN(SELECT template_name FROM user_templates))
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72 WITH CHECK (true);
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73 ALTER TABLE templates ENABLE ROW LEVEL SECURITY;
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75 --
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76 -- RLS policies for waterway_admin
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77 --
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78
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79 -- Security-definer function to get current users country, which allows to
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80 -- restrict the view on user_profiles by country without infinite recursion
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81 CREATE FUNCTION current_user_country()
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82 RETURNS gemma.user_profiles.country%TYPE
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83 AS $$ SELECT country FROM user_profiles WHERE username = session_user $$
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84 LANGUAGE SQL
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85 SECURITY DEFINER
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86 STABLE PARALLEL SAFE;
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87
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88 -- Staging area
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89 -- TODO: add all relevant tables here
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90 CREATE POLICY responsibility_area ON bottlenecks FOR ALL TO waterway_admin
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91 USING (ST_Within(area, (SELECT area FROM responsibility_areas
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92 WHERE country = current_user_country())));
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93 CREATE POLICY responsibility_area ON sounding_results FOR ALL TO waterway_admin
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94 USING (ST_Within(area, (SELECT area FROM responsibility_areas
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95 WHERE country = current_user_country())));
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96
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97 CREATE POLICY country_profiles ON user_profiles FOR SELECT TO waterway_admin
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98 USING (country = current_user_country());
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99
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100 COMMIT;