{"id":92114,"date":"2020-08-23T19:41:56","date_gmt":"2020-08-23T17:41:56","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/realizacziya-rolevoj-modeli-dostupa-s-ispolzovaniem-row-level-security-v-postgresql"},"modified":"2020-08-23T19:41:56","modified_gmt":"2020-08-23T17:41:56","slug":"realizacziya-rolevoj-modeli-dostupa-s-ispolzovaniem-row-level-security-v-postgresql","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/administrirovanie\/realizacziya-rolevoj-modeli-dostupa-s-ispolzovaniem-row-level-security-v-postgresql","title":{"rendered":"A hozz\u00e1f\u00e9r\u00e9si szerepmodelek megval\u00f3s\u00edt\u00e1sa Row Level Security haszn\u00e1lat\u00e1val a PostgreSQL-ben","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A t\u00e9ma fejleszt\u00e9se Et\u00fcd a Row Level Security megval\u00f3s\u00edt\u00e1s\u00e1r\u00f3l a PostgreSQL-ben<\/a><\/noindex> \u00e9s kiterjedt v\u00e1laszhoz<\/b> Gyorsan eml\u00e9kezz\u00fcnk vissza, hogyan m\u0171k\u00f6dik a modul\u00e1ris aritmetika. Az \u00f3ra m\u00e1r egy ismert koncepci\u00f3. Az \u00f3r\u00e1k haszn\u00e1lata megjegyz\u00e9s.<\/a><\/noindex><\/p>\n

A haszn\u00e1lt strat\u00e9gia mag\u00e1ban foglalja a \"\u00dczleti logika az adatb\u00e1zisban\" koncepci\u00f3 alkalmaz\u00e1s\u00e1t, amelyet itt kiss\u00e9 r\u00e9szletesebben ismertet\u00fcnk \u2014 \u00dczleti logika megval\u00f3s\u00edt\u00e1sa PostgreSQL t\u00e1rolt f\u00fcggv\u00e9nyek szintj\u00e9n<\/a><\/noindex><\/p>\n

A teoretikus r\u00e9sz kiv\u00e1l\u00f3an van le\u00edrva a dokument\u00e1ci\u00f3ban Postgres Pro<\/a><\/noindex> \u2014 Sorv\u00e9delmi ir\u00e1nyelvek<\/a><\/noindex>. Az al\u00e1bbiakban egy gyakorlati megval\u00f3s\u00edt\u00e1st mutatunk be egy konkr\u00e9t \u00fczleti feladathoz \u2014 adatel\u00e9r\u00e9si szerepk\u00f6r modell.<\/b><\/p>\n

\"A<\/p>\n

A cikkben nincs semmi \u00faj, nincs rejtett jelent\u00e9s \u00e9s titkos tud\u00e1s. Csak egy v\u00e1zlat a teoretikus \u00f6tlet gyakorlati megval\u00f3s\u00edt\u00e1s\u00e1r\u00f3l. Ha \u00e9rdekes \u2014 olvasd el. Ha nem \u00e9rdekes \u2014 ne pazarold az id\u0151det.<\/p><\/blockquote>\n

<\/a><\/noindex><\/p>\n

L\u00e9pj\u00fcnk \u00e1t a kit\u0171z\u00f6tt feladatra: \u00edrjunk egy XDP mechanizmust SYN cookie-kkal.<\/h2>\n

\nSz\u00fcks\u00e9ges korl\u00e1tozni a dokumentum megtekint\u00e9s\u00e9re\/bek\u00fcld\u00e9s\u00e9re\/m\u00f3dos\u00edt\u00e1s\u00e1ra\/t\u00f6rl\u00e9s\u00e9re val\u00f3 hozz\u00e1f\u00e9r\u00e9st az alkalmaz\u00e1s felhaszn\u00e1l\u00f3j\u00e1nak szerepe szerint. A szerepk\u00f6r alatt az al\u00e1bbi t\u00e1bl\u00e1zat roles<\/b> t\u00f6bb-t\u00f6bbh\u00f6z kapcsol\u00f3d\u00f3 viszonyban van a t\u00e1bl\u00e1zattal Miut\u00e1n meg\u00e1llap\u00edtottuk, hogy ki k\u00fcldte a k\u00e9r\u00e9st, meg kell hat\u00e1roznunk, hogy az adott alanynak mit enged\u00e9lyeztek. Egyes szolg\u00e1ltat\u00e1sr\u00e1csok lehet\u0151v\u00e9 teszik alapvet\u0151 ir\u00e1nyelvek (arr\u00f3l, hogy ki mit tehet) megad\u00e1s\u00e1t YAML-f\u00e1jlok form\u00e1j\u00e1ban vagy parancssoron, m\u00edg m\u00e1sok integr\u00e1ci\u00f3t k\u00edn\u00e1lnak olyan keretrendszerekkel, mint az<\/b>. A t\u00e1bl\u00e1k megval\u00f3s\u00edt\u00e1s\u00e1nak r\u00e9szleteit a trivi\u00e1lis jelleg miatt kihagytuk. Tov\u00e1bb\u00e1 kihagytuk a konkr\u00e9t megval\u00f3s\u00edt\u00e1ssal kapcsolatos r\u00e9szleteket a t\u00e9ma ter\u00fclet\u00e9n.<\/p>\n

Megval\u00f3s\u00edt\u00e1s<\/h2>\n

<\/p>\n

Szerepek, s\u00e9ma, t\u00e1bl\u00e1zat l\u00e9trehoz\u00e1sa<\/h4>\n

<\/p>\n

Adatb\u00e1zis objektumok l\u00e9trehoz\u00e1sa<\/b><\/p>\n

CREATE ROLE store;\nCREATE SCHEMA store AUTHORIZATION store;\nCREATE TABLE store.docs\n(\n  id integer ,         --dokumentum id\n  man_id integer , --dokumentum kezel\u0151j\u00e9nek id-je\n  stat_id integer ,  --dokumentum st\u00e1tusz\u00e1nak id-je\n  ...\n  is_del BOOLEAN DEFAULT FALSE \n);\nALTER TABLE store.docs ADD CONSTRAINT doc_pk PRIMARY KEY (id);\nALTER TABLE store.docs OWNER TO store ;\n<\/code><\/pre>\n
<\/p>\n
Funkci\u00f3k l\u00e9trehoz\u00e1sa az RLS megval\u00f3s\u00edt\u00e1s\u00e1hoz<\/h4>\n
\nAz egyes sorok SELECT-el\u00e9si lehet\u0151s\u00e9g\u00e9nek ellen\u0151rz\u00e9se<\/p>\n
                        check_select<\/b><\/p>\n
CREATE OR REPLACE FUNCTION store.check_select ( current_id store.docs.id%TYPE ) RETURNS boolean AS $$\nDECLARE\n  result boolean ;\n  curr_pid integer ;\n  curr_stat_id integer ;\n  doc_man_id integer ;\nBEGIN \n  -- A DBA hozz\u00e1f\u00e9r\u00e9ssel b\u00edr minden dokumentumhoz\n  IF SESSION_USER = 'curr_dba'\n  THEN\n    RETURN TRUE ;\n  END IF ;\n  --------------------------------\n\n  --Ha a dokumentumnak van 't\u00f6r\u00f6lt' c\u00edmk\u00e9je - ne jelenjen meg a lek\u00e9rdez\u00e9s sor\u00e1n\n  SELECT\n    is_del\n  INTO\n    result\n  FROM\n    store.docs\n  WHERE\n    id = current_id ;\n IF result = TRUE\n THEN\n   RETURN FALSE ;\n END IF ;\n --------------------------------\n\n --Jelenlegi felhaszn\u00e1l\u00f3 ID-j\u00e1nak lek\u00e9r\u00e9se\n SELECT\n   service_function.get_curr_pid ()\n INTO\n   curr_pid ;\n --------------------------------\n\n --A dokumentum kezel\u0151j\u00e9nek ID-j\u00e1nak lek\u00e9r\u00e9se\n SELECT\n   man_id\n INTO\n   doc_man_id\n FROM\n   store.docs\n WHERE\n   id = current_id ;\n --------------------------------\n\n --Ha a dokumentum kezel\u0151je nem a jelenlegi felhaszn\u00e1l\u00f3, vagy a kezel\u0151 nincs megadva\n --helyezze a dokumentumot a lek\u00e9rdez\u00e9sbe\n IF doc_man_id != curr_pid OR doc_man_id IS NULL\n THEN\n   RETURN TRUE  ;\n ELSE\n   --Jelenlegi dokumentum st\u00e1tusz\u00e1nak lek\u00e9r\u00e9se\n   SELECT\n     stat_id                                         \n   INTO\n     curr_statid\n   FROM\n     store.docs\n   WHERE\n     id = current_id ;\n    \n   --Ha a st\u00e1tusz lehet\u0151v\u00e9 teszi a dokumentum megtekint\u00e9s\u00e9t - helyezze a dokumentumot a lek\u00e9rdez\u00e9sbe                     \n   IF curr_statid = 4 OR curr_statid = 9\n   THEN\n     RETURN TRUE ;\n   ELSE\n   --Ellenkez\u0151 esetben - z\u00e1rja ki a dokumentumot a lek\u00e9rdez\u00e9sb\u0151l\n     RETURN FALSE ;\n    END IF ;\n  END IF ;\n  --------------------------------\n\n RETURN FALSE ;\nEND\n$$ LANGUAGE plpgsql SECURITY DEFINER;\nALTER FUNCTION store.check_select( store.docs.id%TYPE  ) OWNER TO store ;\nREVOKE EXECUTE ON FUNCTION store.check_select( store.docs.id%TYPE  ) FROM public; \nGRANT EXECUTE ON FUNCTION store.check_select( store.docs.id%TYPE  ) TO service_functions; \n<\/code><\/pre>\n
\nA sor INSERT v\u00e9grehajt\u00e1s\u00e1nak ellen\u0151rz\u00e9se<\/p>\n
                        check_insert<\/b><\/p>\n
CREATE OR REPLACE FUNCTION store.check_insert ( current_id store.docs.id%TYPE ) RETURNS boolean AS $$\nDECLARE\n  curr_role_id integer ;\nBEGIN\n  --A DBA b\u00e1rhol tud \u00faj sort hozz\u00e1adni\n  IF SESSION_USER = 'curr_dba'\n  THEN\n    RETURN TRUE ;\n  END IF ;\n  --------------------------------\n\n --A jelenlegi felhaszn\u00e1l\u00f3 szerepk\u00f6r\u00e9nek ID-j\u00e9nek lek\u00e9r\u00e9se \n SELECT\n   service_functions.current_rid()\n  INTO\n    curr_role_id ;\n --------------------------------\n\n--Ha a szerepk\u00f6r lehet\u0151v\u00e9 teszi \u00faj dokumentum l\u00e9trehoz\u00e1s\u00e1t\n--engedni kell\nIF curr_role_id = 3 OR curr_role_id = 5     \nTHEN\n  RETURN TRUE ;\nEND IF ;\n--------------------------------\nRETURN FALSE  ;\nEND\n$$ LANGUAGE plpgsql SECURITY DEFINER;\nALTER FUNCTION store.check_insert( store.docs.id%TYPE  ) OWNER TO store ;\nREVOKE EXECUTE ON FUNCTION store.check_insert( store.docs.id%TYPE  ) FROM public;\nGRANT EXECUTE ON FUNCTION store.check_insert( store.docs.id%TYPE  ) TO service_functions; \n<\/code><\/pre>\n
\nA sor DELETE v\u00e9grehajt\u00e1s\u00e1nak ellen\u0151rz\u00e9se<\/p>\n
                        check_delete<\/b><\/p>\n
CREATE OR REPLACE FUNCTION store.check_delete ( current_id store.docs.id%TYPE )\nRETURNS boolean AS $$\nBEGIN  \n  --Csak a DBA tud sort t\u00f6r\u00f6lni \n  IF SESSION_USER = 'curr_dba'\n  THEN\n    RETURN TRUE ;\n  END IF ;\n  --------------------------------\n\n  RETURN FALSE ;\nEND\n$$ LANGUAGE plpgsql\nSECURITY DEFINER;\nALTER FUNCTION store.check_delete( store.docs.id%TYPE  ) OWNER TO store ;\nREVOKE EXECUTE ON FUNCTION store.check_delete( store.docs.id%TYPE  ) FROM public;<\/code><\/pre>\n
\nA sor UPDATE v\u00e9grehajt\u00e1s\u00e1nak ellen\u0151rz\u00e9se.<\/p>\n
                        update_using<\/b><\/p>\n
CREATE OR REPLACE FUNCTION store.update_using ( current_id store.docs.id%TYPE , is_del boolean  )\nRETURNS boolean AS $$\nBEGIN  \n   --Az elt\u00e1vol\u00edtott st\u00e1tusszal rendelkez\u0151 dokumentumok nem m\u00f3dos\u00edthat\u00f3k\n   IF is_del \n   THEN\n     RETURN FALSE ;\n ELSE\n    RETURN TRUE ;\n  END IF ;\n\nEND\n$$ LANGUAGE plpgsql SECURITY DEFINER;\nALTER FUNCTION store.update_using(  store.docs.id%TYPE ,  boolean  ) OWNER TO store ;\nREVOKE EXECUTE ON FUNCTION store.update_using(  store.docs.id%TYPE ,  boolean  ) FROM public;\nGRANT EXECUTE ON FUNCTION store.update_using( store.docs.id%TYPE  ) TO service_functions;<\/code><\/pre>\n
<\/p>\n
                        update_check<\/b><\/p>\n
CREATE OR REPLACE FUNCTION store.update_with_check ( current_id store.docs.id%TYPE , is_del boolean )\nRETURNS boolean AS $$\nDECLARE\n  current_rid integer ;\n  current_statid integer ;\nBEGIN                \n\n  --DBA megtekintheti a sort \n  IF SESSION_USER = 'curr_dba'\n  THEN\n    RETURN TRUE ;\n  END IF ;\n  --------------------------------\n\n --A jelenlegi felhaszn\u00e1l\u00f3 szerepk\u00f6razonos\u00edt\u00f3j\u00e1nak megszerz\u00e9se \n SELECT\n   service_functions.current_rid()\n  INTO\n    curr_role_id ;\n --------------------------------                            \n\n --Dokumentum elt\u00e1vol\u00edt\u00e1sa - tulajdons\u00e1g m\u00f3dos\u00edt\u00e1sa \n IF is_deleted\n THEN\n   --Ha a felhaszn\u00e1l\u00f3 szerepe ***\n   IF current_role_id = 3        \n   THEN\n      SELECT\n        stat_id                                          \n      INTO\n        curr_statid\n      FROM\n        store.docs\n      WHERE\n        id = current_id ;\n\n      --A dokumentum *** st\u00e1tusza nem t\u00f6r\u00f6lhet\u0151 \n      IF current_status_id = 11\n      THEN\n         RETURN FALSE ;\n      ELSE\n      --Dokumentum t\u00f6rl\u00e9se m\u00e1s st\u00e1tuszokban lehets\u00e9ges\n        RETURN TRUE ;\n      END IF ;\n\n    --Egy\u00e9bk\u00e9nt, ha a felhaszn\u00e1l\u00f3 szerepe ***\n    ELSIF current_role_id = 5            \n    THEN\n      --A dokumentumok \u00f6sszes st\u00e1tusza \n      RETURN TRUE ;\n    ELSE\n      --A t\u00f6bbi felhaszn\u00e1l\u00f3nak nem lehet dokumentumokat t\u00f6r\u00f6lni\n      RETURN FALSE ;\n    END IF ;\n ELSE      \n   --A dokumentum friss\u00edt\u00e9se enged\u00e9lyezett\n    RETURN TRUE ;\nEND IF ;\n\nRETURN FALSE ;\nEND\n$$ LANGUAGE plpgsql SECURITY DEFINER;\nALTER FUNCTION store.update_with_check( storg.docs.id%TYPE ,  boolean   ) OWNER TO store ;\nREVOKE EXECUTE ON FUNCTION store.update_with_check( storg.docs.id%TYPE ,  boolean   )  FROM public;\nGRANT EXECUTE ON FUNCTION store.update_with_check( store.docs.id%TYPE  ) TO service_functions;<\/code><\/pre>\n
\nA sor szint\u0171 biztons\u00e1gi politika aktiv\u00e1l\u00e1sa a t\u00e1bl\u00e1zat sz\u00e1m\u00e1ra.<\/p>\n
                        ROW LEVEL SECURITY ENGED\u00c9LYEZ\u00c9SE<\/b><\/p>\n
ALTER TABLE store.docs ENABLE ROW LEVEL SECURITY ;\n\nCREATE POLICY doc_select ON store.docs FOR SELECT TO service_functions USING ( (SELECT store.check_select(id)) );\nCREATE POLICY doc_insert ON store.docs FOR INSERT TO service_functions WITH CHECK ( (SELECT store.check_insert(id)) );\nCREATE POLICY docs_delete ON store.docs FOR DELETE TO service_functions USING ( (SELECT store.check_delete(id)) );\n\nCREATE POLICY doc_update_using ON store.docs FOR UPDATE TO service_functions USING ( (SELECT store.update_using(id , is_del )) );\nCREATE POLICY doc_update_check ON store.docs FOR UPDATE TO service_functions  WITH CHECK ( (SELECT store.update_with_check(id , is_del )) );<\/code><\/pre>\n
<\/p>\n
Result<\/h2>\n
\nEz m\u0171k\u00f6dik.<\/p>\n
A javasolt strat\u00e9gia lehet\u0151v\u00e9 tette a szerepk\u00f6rmodell megval\u00f3s\u00edt\u00e1s\u00e1nak \u00e1thelyez\u00e9s\u00e9t a bizniszfukci\u00f3k szintj\u00e9r\u0151l az adatkezel\u00e9s szintj\u00e9re. <\/p>\n
A funkci\u00f3k felhaszn\u00e1lhat\u00f3k mint\u00e1kk\u00e9nt \u00f6sszetettebb adatrejt\u00e9si modellek megval\u00f3s\u00edt\u00e1s\u00e1ra is, ha az \u00fczleti k\u00f6vetelm\u00e9nyek megk\u00f6vetelik.
\n
Forr\u00e1s: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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\u043f\u043e\u0434\u0440\u043e\u0431\u043d\u0435\u0435 \u043e\u043f\u0438\u0441\u0430\u043d\u043e \u0437\u0434\u0435\u0441\u044c \u2014 \u042d\u0442\u044e\u0434 \u043f\u043e \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f \u0431\u0438\u0437\u043d\u0435\u0441-\u043b\u043e\u0433\u0438\u043a\u0438 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u0445\u0440\u0430\u043d\u0438\u043c\u044b\u0445 \u0444\u0443\u043d\u043a\u0446\u0438\u0439 PostgreSQL \u0422\u0435\u043e\u0440\u0435\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0447\u0430\u0441\u0442\u044c \u043e\u0442\u043b\u0438\u0447\u043d\u043e \u043e\u043f\u0438\u0441\u0430\u043d\u0430 \u0432 \u0434\u043e\u043a\u0443\u043c\u0435\u043d\u0442\u0430\u0446\u0438\u0438 Postgres Pro \u2014 \u041f\u043e\u043b\u0438\u0442\u0438\u043a\u0438 \u0437\u0430\u0449\u0438\u0442\u044b \u0441\u0442\u0440\u043e\u043a. \u041d\u0438\u0436\u0435 \u0440\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0435\u043d\u0430 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