{"id":92107,"date":"2020-08-23T07:42:16","date_gmt":"2020-08-23T05:42:16","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/etyud-po-realizaczii-row-level-secutity-v-postgresql"},"modified":"2020-08-23T07:42:16","modified_gmt":"2020-08-23T05:42:16","slug":"etyud-po-realizaczii-row-level-secutity-v-postgresql","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/administrirovanie\/etyud-po-realizaczii-row-level-secutity-v-postgresql","title":{"rendered":"Studie af implementering af Row Level Security i PostgreSQL","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Som et supplement til Studie af implementering af forretningslogik p\u00e5 niveau med gemte funktioner i PostgreSQL<\/a><\/noindex> og prim\u00e6rt til en udvidet besvarelse<\/b> og f\u00e5 en fungerende kommando. kommentar<\/a><\/noindex>.<\/p>\n

Den teoretiske del er fremragende beskrevet i dokumentationen Postgres Pro<\/a><\/noindex> \u2014 R\u00e6kkebeskyttelsespolitikker<\/a><\/noindex>. Nedenfor gennemg\u00e5s den praktiske implementering af en lille konkret forretningsopgave \u2014 skjulning af fjernede data.<\/b> Studiet dedikeret til implementeringen af en rollemodel ved brug af RLS<\/a><\/noindex><\/b> pr\u00e6senteres separat.<\/p>\n

\"Studie<\/p>\n

I artiklen er der ikke noget nyt, ingen skjult mening eller hemmelig viden. Bare en skitse af praktisk implementering af en teoretisk id\u00e9. Hvis nogen er interesseret - l\u00e6s. Hvis ikke - spild ikke din tid.<\/p><\/blockquote>\n

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

Problemformulering<\/h3>\n

\nUden at dykke dybt ned i emnet kan opgaven kort beskrives som f\u00f8lger: der er en tabel, der implementerer en forretningsenhed. R\u00e6kker i tabellen kan slettes, men fysiske sletninger er ikke mulige; de skal skjules. <\/p>\n

For det er sagt \u2014 \"Slet ikke noget, omd\u00f8b blot. Internettet gemmer ALT\" <\/b><\/p>\n

<\/i> Samtidig er det \u00f8nskeligt ikke at omskrive allerede eksisterende gemte funktioner, der arbejder med denne enhed.<\/p>\n

For at implementere dette koncept har tabellen en attribut is_deleted<\/i>. Herefter er det simpelt \u2014 det er n\u00f8dvendigt at sikre, at kunden kun kan se de r\u00e6kker, hvor attributten is_deleted<\/i> er falsk. Til dette bruges mekanismen Row Level Security.<\/b><\/p>\n

Implementering<\/h3>\n

\nVi opretter en separat rolle og et skema<\/p>\n

CREATE ROLE repos;\nCREATE SCHEMA repos;<\/code><\/pre>\n
\nOpretter m\u00e5ltavlen<\/p>\n
CREATE TABLE repos.file\n(\n...\nis_del BOOLEAN DEFAULT FALSE\n);\nCREATE SCHEMA repos<\/code><\/pre>\n
\nAktiverer Row Level Security<\/i><\/p>\n
ALTER TABLE repos.file  ENABLE ROW LEVEL SECURITY ;\nCREATE POLICY file_invisible_deleted  ON repos.file FOR ALL TO dba_role USING ( NOT is_deleted );\nGRANT ALL ON TABLE repos.file to dba_role ;\nGRANT USAGE ON SCHEMA repos TO dba_role ;<\/code><\/pre>\n
\nServicefunktion<\/b> \u2014 sletning af en r\u00e6kke i tabellen<\/p>\n
CREATE OR REPLACE repos.delete( curr_id repos.file.id%TYPE)\nRETURNS integer AS $$\nBEGIN\n...\nUPDATE repos.file\nSET is_del = TRUE \nWHERE id = curr_id ; \n...\nEND\n$$ LANGUAGE plpgsql SECURITY DEFINER;<\/code><\/pre>\n
\nForretningsfunktion<\/b> \u2014 sletning af dokument<\/p>\n
CREATE OR REPLACE business_functions.deleteDoc( doc_for_delete JSON )\nRETURNS JSON AS $$\nBEGIN\n...\nPERFORM  repos.delete( doc_id ) ;\n...\nEND\n$$ LANGUAGE plpgsql SECURITY DEFINER;<\/code><\/pre>\n
<\/p>\n
Resultater<\/h3>\n
\nKunden sletter dokumentet<\/p>\n
SELECT business_functions.delCFile( (SELECT json_build_object( 'CId', 3 )) );<\/code><\/pre>\n
\nEfter sletningen kan kunden ikke se dokumentet<\/p>\n
SELECT business_functions.getCFile(\"(SELECT json_build_object( 'CId', 3 ))\") ;\n-----------------\n(0 rows)<\/code><\/pre>\n
\nMen i databasen er dokumentet ikke slettet, kun attributten is_del<\/i><\/p>\n
psql -d my_db\nSELECT  id, name , is_del FROM repos.file ;\nid |  name  | is_del\n--+---------+------------\n 1 |  test_1 | t\n(1 row)<\/code><\/pre>\n
\nSom kr\u00e6vet i opgaveformuleringen. <\/p>\n
Resultat<\/h2>\n
\nHvis emnet er interessant, kan n\u00e6ste studie vise et eksempel p\u00e5 implementeringen af en rollemodel for adskillelse af dataadgang ved brug af Row Level Security.
\n
Kilde: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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