{"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\/sl\/blog\/administrirovanie\/realizacziya-rolevoj-modeli-dostupa-s-ispolzovaniem-row-level-security-v-postgresql","title":{"rendered":"Implementacija modela uloge pristupa kori\u0161\u0107enjem Row Level Security u PostgreSQL","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Razvoj teme Etid o implementaciji Row Level Security u PostgreSQL<\/a><\/noindex> in za obse\u017eno odgovornost<\/b> na komentar.<\/a><\/noindex><\/p>\n

Uporabljena strategija pomeni uporabo koncepta 'Poslovna logika v BDP', kar je bilo nekoliko podrobneje opisano tukaj \u2014 Etid o implementaciji poslovne logike na nivou sa\u010duvanih funkcija PostgreSQL<\/a><\/noindex><\/p>\n

Teorijski deo je odli\u010dno opisan u dokumentaciji Postgres Pro<\/a><\/noindex> \u2014 Politike za\u0161tite redova<\/a><\/noindex>. Spodaj je obravnavana prakti\u010dna izvedba konkretne poslovne naloge \u2014 rolni model dostopa do podatkov.<\/b><\/p>\n

\"Implementacija<\/p>\n

U \u010dlanku nema ni\u010deg novog, nema skrivenog smisla ili tajnih znanja. Samo skica o prakti\u010dnoj realizaciji teorijske ideje. Ako nekoga zanima \u2014 \u010ditajte. Onima kojima nije zanimljivo \u2014 nemojte tro\u0161iti vreme uzalud.<\/p><\/blockquote>\n

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

Definisanje zadatka<\/h2>\n

\nZaradi vloge uporabnika aplikacije je potrebno omejiti dostop do ogledovanja\/ulo\u017eitev\/spremembe\/brisanja dokumenta. Pod vlogo se razume zapis v tabeli roles<\/b> v zvezi z mnogimi na mnoge s tabelo users<\/b>. Podrobnosti izvedbe tabel so bile zaradi trivialnosti izpu\u0161\u010dene. Prav tako so izpu\u0161\u010dene konkretne podrobnosti izvedbe, povezane s predmetno podro\u010dje.<\/p>\n

Implementacija<\/h2>\n

<\/p>\n

Ustvarjanje vlog, shem, tabelo<\/h4>\n

<\/p>\n

Ustvarjanje objektov BDP<\/b><\/p>\n

CREATE ROLE store;\nCREATE SCHEMA store AUTHORIZATION store;\nCREATE TABLE store.docs\n(\n  id integer ,         --id dokumenta\n  man_id integer , --id upravitelja dokumenta\n  stat_id integer ,  --id statusa dokumenta\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
Ustvarjanje funkcij za izvajanje RLS<\/h4>\n
\nPreverjanje mo\u017enosti izvedbe SELECT vrstice<\/p>\n
                        check_select<\/b><\/p>\n
ZCREATE OR REPLACE FUNCTION store.check_select (current_id store.docs.id%TYPE) RETURNS boolean AS $$\nDECLARE\n  result boolean;\n  curr_pid integer;\n  curr_stat_id integer;\n  doc_man_id integer;\nBEGIN\n  -- DBA ima pristup svim dokumentima\n  IF SESSION_USER = 'curr_dba'\n  THEN\n    RETURN TRUE;\n  END IF;\n  --------------------------------\n\n  --Ako dokument ima oznaku 'izbrisan' - ne prikazivati u selekciji\n  SELECT\n    is_del\n  INTO\n    result\n  FROM\n    store.docs\n  WHERE\n    id = current_id;\n IF result = TRUE\n THEN\n   RETURN FALSE;\n END IF;\n --------------------------------\n\n --Dobiti id trenutnog korisnika\n SELECT\n   service_function.get_curr_pid()\n INTO\n   curr_pid;\n --------------------------------\n\n --Dobiti id menad\u017eera dokumenta\n SELECT\n   man_id\n INTO\n   doc_man_id\n FROM\n   store.docs\n WHERE\n   id = current_id;\n --------------------------------\n\n --Ako menad\u017eer dokumenta nije trenutni korisnik ili menad\u017eer nije dodeljen\n --dodati dokument u selekciju\n IF doc_man_id != curr_pid OR doc_man_id IS NULL\n THEN\n   RETURN TRUE;\n ELSE\n   --Dobiti trenutni status dokumenta\n   SELECT\n     stat_id\n   INTO\n     curr_statid\n   FROM\n     store.docs\n   WHERE\n     id = current_id;\n    \n   --Ako status dozvoljava pregled dokumenta - dodati dokument u selekciju\n   IF curr_statid = 4 OR curr_statid = 9\n   THEN\n     RETURN TRUE;\n   ELSE\n   --Ina\u010de - isklju\u010diti dokument iz selekcije\n     RETURN FALSE;\n    END IF;\n  END IF;\n  --------------------------------\n\n RETURN FALSE;\nEND\n$$ 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
\nProvera mogu\u0107nosti izvr\u0161enja INSERT reda<\/p>\n
                        check_insert<\/b><\/p>\n
CREATE OR REPLACE FUNCTION store.check_insert (current_id store.docs.id%TYPE) RETURNS boolean AS $$\nDECLARE\n  curr_role_id integer;\nBEGIN\n  --DBA mo\u017ee dodavati red u svakom slu\u010daju\n  IF SESSION_USER = 'curr_dba'\n  THEN\n    RETURN TRUE;\n  END IF;\n  --------------------------------\n\n --Dobiti id uloge trenutnog korisnika\n SELECT\n   service_functions.current_rid()\n  INTO\n    curr_role_id;\n --------------------------------\n\n--Ako uloga dozvoljava mogu\u0107nost kreiranja novog dokumenta\n--dozvoliti\nIF curr_role_id = 3 OR curr_role_id = 5\nTHEN\n  RETURN TRUE;\nEND IF;\n--------------------------------\nRETURN FALSE;\nEND\n$$ 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
\nProvera mogu\u0107nosti izvr\u0161enja DELETE reda<\/p>\n
                        check_delete<\/b><\/p>\n
CREATE OR REPLACE FUNCTION store.check_delete (current_id store.docs.id%TYPE)\nRETURNS boolean AS $$\nBEGIN\n  --Samo DBA mo\u017ee brisati red\n  IF SESSION_USER = 'curr_dba'\n  THEN\n    RETURN TRUE;\n  END IF;\n  --------------------------------\n\n  RETURN FALSE;\nEND\n$$ 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
\nProvera mogu\u0107nosti izvr\u0161enja UPDATE reda.<\/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 $$\nBEGIN  \n   --Dokumenti s statusom 'izbrisan' - ne ure\u0111uju se\n   IF is_del \n   THEN\n     RETURN FALSE ;\n ELSE\n    RETURN TRUE ;\n  END IF ;\n\nEND\n$$ 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 $$\nDECLARE\n  current_rid integer ;\n  current_statid integer ;\nBEGIN                \n\n  --DBA mo\u017ee pregledati red\n  IF SESSION_USER = 'curr_dba'\n  THEN\n    RETURN TRUE ;\n  END IF ;\n  --------------------------------\n\n --Dobijanje id uloge trenutnog korisnika \n SELECT\n   service_functions.current_rid()\n  INTO\n    curr_role_id ;\n --------------------------------                            \n\n --Brisanje dokumenta - promjena stanja \n IF is_deleted\n THEN\n   --Ako je uloga korisnika ***\n   IF current_role_id = 3        \n   THEN\n      SELECT\n        stat_id                                          \n      INTO\n        curr_statid\n      FROM\n        store.docs\n      WHERE\n        id = current_id ;\n\n      --Dokument u statusu *** ne mo\u017ee se obrisati \n      IF current_status_id = 11\n      THEN\n         RETURN FALSE ;\n      ELSE\n      --Mo\u017ee se obrisati dokument u drugim statusima\n        RETURN TRUE ;\n      END IF ;\n\n    --Ina\u010de, ako je uloga korisnika ***\n    ELSIF current_role_id = 5            \n    THEN\n      --Svi statusi dokumenta \n      RETURN TRUE ;\n    ELSE\n      --Drugi korisnici ne mogu brisati dokumente\n      RETURN FALSE ;\n    END IF ;\n ELSE      \n   --A\u017euriranje dokumenta je dozvoljeno\n    RETURN TRUE ;\nEND IF ;\n\nRETURN FALSE ;\nEND\n$$ LANGUAGE plpgsql SECURITY DEFINER;\nALTER FUNCTION store.update_with_check( store.docs.id%TYPE ,  boolean   ) OWNER TO store ;\nREVOKE EXECUTE ON FUNCTION store.update_with_check( store.docs.id%TYPE ,  boolean   )  FROM public;\nGRANT EXECUTE ON FUNCTION store.update_with_check( store.docs.id%TYPE ) TO service_functions;<\/code><\/pre>\n
\nUklju\u010divanje politike Row Level Security za tabelu.<\/p>\n
                        ENABLE ROW LEVEL SECURITY<\/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
Zaklju\u010dek<\/h2>\n
\nTo funkcioni\u0161e.<\/p>\n
Predlo\u017eena strategija omogu\u0107ila je prenos implementacije modelske uloge sa nivoa poslovnih funkcija na nivo skladi\u0161tenja podataka. <\/p>\n
Funkcije se mogu koristiti kao \u0161ablon za implementaciju sofisticiranijih modela sakrivanja podataka, ako to poslovne potrebe zahtevaju.
\n
Izvor: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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