{"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\/ro\/blog\/administrirovanie\/realizacziya-rolevoj-modeli-dostupa-s-ispolzovaniem-row-level-security-v-postgresql","title":{"rendered":"Implementarea modelului de acces bazat pe roluri cu utilizarea Row Level Security \u00een PostgreSQL","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Dezvoltarea temei Studiu despre implementarea Seqven\u021bei de Securitate la Nivel de R\u00e2nd \u00een PostgreSQL<\/a><\/noindex> \u0219i pentru un r\u0103spuns detaliat<\/b> pe comentariu.<\/a><\/noindex><\/p>\n

Strategia utilizat\u0103 implic\u0103 utilizarea conceptului de \u201elogica de afaceri \u00een BD\u201d, care a fost descris\u0103 mai detaliat aici \u2014 Studiu despre implementarea logici de afaceri la nivelul func\u021biilor stocate \u00een PostgreSQL<\/a><\/noindex><\/p>\n

Partea teoretic\u0103 este bine descris\u0103 \u00een documenta\u021bie Postgres Pro<\/a><\/noindex> \u2014 Politicile de protec\u021bie a r\u00e2ndurilor<\/a><\/noindex>. Mai jos este analizat\u0103 implementarea practic\u0103 a unei sarcini de afaceri specifice \u2014 modelul de acces la date.<\/b><\/p>\n

\"Implementarea<\/p>\n

\u00cen articol nu este nimic nou, nu exist\u0103 sens ascuns \u0219i cuno\u0219tin\u021be secrete. Doar o schi\u021b\u0103 despre implementarea practic\u0103 a unei idei teoretice. Dac\u0103 este cineva interesat \u2014 citi\u021bi. Pentru cei care nu sunt interesa\u021bi \u2014 nu pierde\u021bi timpul \u00een zadar.<\/p><\/blockquote>\n

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

Formularea problemei<\/h2>\n

\nEste necesar\u0103 delimitarea accesului la vizualizarea\/inserarea\/modificarea\/\u0219tergerea documentului \u00een func\u021bie de rolul utilizatorului aplica\u021biei. Prin rol se \u00een\u021belege o \u00eenregistrare \u00een tabelul roles<\/b> asociat printr-o rela\u021bie de tip many-to-many cu tabelul aveau adrese de email pe domeniile<\/b>. Detalii despre implementarea tabelelor, din motive de trivialitate, sunt omise. De asemenea, sunt omise detaliile specifice implement\u0103rii legate de domeniul de interes.<\/p>\n

Implementarea<\/h2>\n

<\/p>\n

Cre\u0103m roluri, scheme, tabelul<\/h4>\n

<\/p>\n

Crearea obiectelor BD<\/b><\/p>\n

CREATE ROLE store;\nCREATE SCHEMA store AUTHORIZATION store;\nCREATE TABLE store.docs\n(\n  id integer ,         --id document\n  man_id integer , --id manager document\n  stat_id integer ,  --id statut document\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
Cre\u0103m func\u021bii pentru implementarea RLS<\/h4>\n
\nVerificarea posibilit\u0103\u021bii de a efectua SELECT pe linie<\/p>\n
                        check_select<\/b><\/p>\n
CREA\u021aI SAU \u00ceNLOCUI\u021aI FUNC\u021aIA store.check_select ( current_id store.docs.id%TYPE ) RETURNEAZ\u0102 boolean AS $$\nDECLARE\n  result boolean ;\n  curr_pid integer ;\n  curr_stat_id integer ;\n  doc_man_id integer ;\nBEGIN \n  -- DBA are acces la toate documentele\n  IF SESSION_USER = 'curr_dba'\n  THEN\n    RETURN TRUE ;\n  END IF ;\n  --------------------------------\n\n  --Dac\u0103 documentul are eticheta '\u0219ters' - nu se va ar\u0103ta \u00een selec\u021bie\n  SELECT\n    is_del\n  INTO\n    result\n  FROM\n    store.docs\n  WHERE\n    id = current_id ;\n IF result = TRUE\n THEN\n   RETURN FALSE ;\n END IF ;\n --------------------------------\n\n --Ob\u021bine id-ul utilizatorului curent\n SELECT\n   service_function.get_curr_pid ()\n INTO\n   curr_pid ;\n --------------------------------\n\n --Ob\u021bine id-ul managerului documentului\n SELECT\n   man_id\n INTO\n   doc_man_id\n FROM\n   store.docs\n WHERE\n   id = current_id ;\n --------------------------------\n\n --Dac\u0103 managerul documentului nu este utilizatorul curent sau managerul nu este desemnat\n --adaug\u0103 documentul \u00een selec\u021bie\n IF doc_man_id != curr_pid OR doc_man_id IS NULL\n THEN\n   RETURN TRUE  ;\n ELSE\n   --Ob\u021bine statutul curent al documentului\n   SELECT\n     stat_id                                         \n   INTO\n     curr_statid\n   FROM\n     store.docs\n   WHERE\n     id = current_id ;\n    \n   --Dac\u0103 statutul permite vizualizarea documentului - adaug\u0103 documentul \u00een selec\u021bie                     \n   IF curr_statid = 4 OR curr_statid = 9\n   THEN\n     RETURN TRUE ;\n   ELSE\n   --\u00cen caz contrar - exclude documentul din selec\u021bie\n     RETURN FALSE ;\n    END IF ;\n  END IF ;\n  --------------------------------\n\n RETURN FALSE ;\nEND\n$$ LIMBA plpgsql SECURITY DEFINER;\nALTER FUNCTION store.check_select( store.docs.id%TYPE  ) OWNER TO store ;\nREVOCA\u021aI EXECUTAREA PE FUNC\u021aIA store.check_select( store.docs.id%TYPE  ) DE LA public; \nACORD\u0102 EXECUTAREA PE FUNC\u021aIA store.check_select( store.docs.id%TYPE  ) C\u0102TRE service_functions; \n<\/code><\/pre>\n
\nVerificarea posibilit\u0103\u021bii de a efectua INSERT pe o linie<\/p>\n
                        check_insert<\/b><\/p>\n
CREA\u021aI SAU \u00ceNLOCUI\u021aI FUNC\u021aIA store.check_insert ( current_id store.docs.id%TYPE ) RETURNEAZ\u0102 boolean AS $$\nDECLARE\n  curr_role_id integer ;\nBEGIN\n  --DBA poate ad\u0103uga o linie \u00een orice caz\n  IF SESSION_USER = 'curr_dba'\n  THEN\n    RETURN TRUE ;\n  END IF ;\n  --------------------------------\n\n --Ob\u021bine id-ul rolului utilizatorului curent \n SELECT\n   service_functions.current_rid()\n  INTO\n    curr_role_id ;\n --------------------------------\n\n--Dac\u0103 rolul permite crearea unui nou document\n--permite\nIF curr_role_id = 3 OR curr_role_id = 5     \nTHEN\n  RETURN TRUE ;\nEND IF ;\n--------------------------------\nRETURN FALSE  ;\nEND\n$$ LIMBA plpgsql SECURITY DEFINER;\nALTER FUNCTION store.check_insert( store.docs.id%TYPE  ) OWNER TO store ;\nREVOCA\u021aI EXECUTAREA PE FUNC\u021aIA store.check_insert( store.docs.id%TYPE  ) DE LA public;\nACORD\u0102 EXECUTAREA PE FUNC\u021aIA store.check_insert( store.docs.id%TYPE  ) C\u0102TRE service_functions; \n<\/code><\/pre>\n
\nVerificarea posibilit\u0103\u021bii de a efectua DELETE pe o linie<\/p>\n
                        check_delete<\/b><\/p>\n
CREA\u021aI SAU \u00ceNLOCUI\u021aI FUNC\u021aIA store.check_delete ( current_id store.docs.id%TYPE )\nRETURNEAZ\u0102 boolean AS $$\nBEGIN  \n  --Numai DBA poate \u0219terge o linie \n  IF SESSION_USER = 'curr_dba'\n  THEN\n    RETURN TRUE ;\n  END IF ;\n  --------------------------------\n\n  RETURN FALSE ;\nEND\n$$ LIMBA plpgsql\nSECURITY DEFINER;\nALTER FUNCTION store.check_delete( store.docs.id%TYPE  ) OWNER TO store ;\nREVOCA\u021aI EXECUTAREA PE FUNC\u021aIA store.check_delete( store.docs.id%TYPE  ) DE LA public;<\/code><\/pre>\n
\nVerificarea posibilit\u0103\u021bii de a efectua UPDATE pe o linie.<\/p>\n
                        actualizare_utilizare<\/b><\/p>\n
CREATE OR REPLACE FUNCTION store.actualizare_utilizare ( current_id store.docs.id%TYPE , is_del boolean )\nRETURNS boolean AS $$\nBEGIN  \n   --Documentele cu statut '\u0219ters' nu pot fi editate\n   IF is_del \n   THEN\n     RETURN FALSE ;\n ELSE\n    RETURN TRUE ;\n  END IF ;\n\nEND\n$$ LANGUAGE plpgsql SECURITY DEFINER;\nALTER FUNCTION store.actualizare_utilizare(  store.docs.id%TYPE ,  boolean  ) OWNER TO store ;\nREVOKE EXECUTE ON FUNCTION store.actualizare_utilizare(  store.docs.id%TYPE ,  boolean  ) FROM public;\nGRANT EXECUTE ON FUNCTION store.actualizare_utilizare( store.docs.id%TYPE  ) TO service_functions;<\/code><\/pre>\n
<\/p>\n
                        verificare_actualizare<\/b><\/p>\n
CREATE OR REPLACE FUNCTION store.actualizare_cu_verificare ( current_id store.docs.id%TYPE , is_del boolean )\nRETURNS boolean AS $$\nDECLARE\n  current_rid integer ;\n  current_statid integer ;\nBEGIN                \n\n  --DBA poate vizualiza r\u00e2ndul \n  IF SESSION_USER = 'curr_dba'\n  THEN\n    RETURN TRUE ;\n  END IF ;\n  --------------------------------\n\n --Ob\u021bine id-ul rolului utilizatorului curent \n SELECT\n   service_functions.current_rid()\n  INTO\n    curr_role_id ;\n --------------------------------                            \n\n --\u0218tergerea documentului - modificarea semnului \n IF is_deleted\n THEN\n   --Dac\u0103 rolul utilizatorului ***\n   IF current_role_id = 3        \n   THEN\n      SELECT\n        stat_id                                          \n      INTO\n        curr_statid\n      FROM\n        store.docs\n      WHERE\n        id = current_id ;\n\n      --Documentul \u00een statutul *** nu poate fi \u0219ters \n      IF current_status_id = 11\n      THEN\n         RETURN FALSE ;\n      ELSE\n      --Se poate \u0219terge documentul \u00een alte staturi\n        RETURN TRUE ;\n      END IF ;\n\n    --Altfel, dac\u0103 rolul utilizatorului ***\n    ELSIF current_role_id = 5            \n    THEN\n      --Toate staturile documentului \n      RETURN TRUE ;\n    ELSE\n      --Al\u021bi utilizatori nu pot \u0219terge documente\n      RETURN FALSE ;\n    END IF ;\n ELSE      \n   --Actualizarea documentului este permis\u0103\n    RETURN TRUE ;\nEND IF ;\n\nRETURN FALSE ;\nEND\n$$ LANGUAGE plpgsql SECURITY DEFINER;\nALTER FUNCTION store.actualizare_cu_verificare( storg.docs.id%TYPE ,  boolean   ) OWNER TO store ;\nREVOKE EXECUTE ON FUNCTION store.actualizare_cu_verificare( storg.docs.id%TYPE ,  boolean   )  FROM public;\nGRANT EXECUTE ON FUNCTION store.actualizare_cu_verificare( store.docs.id%TYPE  ) TO service_functions;<\/code><\/pre>\n
\nActivarea politicii de Securitate pe Nivel de R\u00e2nd pentru tabel.<\/p>\n
                        ACTIVA\u021aI SECURITATEA PE NIVEL DE R\u00c2ND<\/b><\/p>\n
ALTER TABLE store.docs ACTIVA\u021aI SECURITATEA PE NIVEL DE R\u00c2ND ;\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.actualizare_utilizare(id , is_del )) );\nCREATE POLICY doc_update_check ON store.docs FOR UPDATE TO service_functions  WITH CHECK ( (SELECT store.actualizare_cu_verificare(id , is_del )) );<\/code><\/pre>\n
<\/p>\n
Rezultatul<\/h2>\n
\nFunc\u021bioneaz\u0103.<\/p>\n
Strategia propus\u0103 a permis transferarea implement\u0103rii modelului de roluri de la nivelul func\u021biilor de afaceri la nivelul stoc\u0103rii datelor. <\/p>\n
Func\u021biile pot fi utilizate ca \u0219ablon pentru implementarea unor modele mai sofisticate de ascundere a datelor, dac\u0103 cerin\u021bele de afaceri impun acest lucru.
\n
Sursa: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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