{"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\/hu\/blog\/administrirovanie\/etyud-po-realizaczii-row-level-secutity-v-postgresql","title":{"rendered":"Et\u00fcd a Row Level Security megval\u00f3s\u00edt\u00e1s\u00e1r\u00f3l a PostgreSQL-ben","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Kieg\u00e9sz\u00edt\u00e9sk\u00e9nt \u00dczleti logika megval\u00f3s\u00edt\u00e1sa PostgreSQL t\u00e1rolt f\u00fcggv\u00e9nyek szintj\u00e9n<\/a><\/noindex> \u00e9s f\u0151k\u00e9nt a r\u00e9szletes 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 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 kis gyakorlati megval\u00f3s\u00edt\u00e1st t\u00e1rgyalunk konkr\u00e9t \u00fczleti feladat \u2014 a t\u00f6r\u00f6lt adatok elrejt\u00e9se.<\/b> Az et\u00fcd a megval\u00f3s\u00edt\u00e1sra vonatkozik Szerepk\u00f6rmodell RLS haszn\u00e1lat\u00e1val<\/a><\/noindex><\/b> k\u00fcl\u00f6n bevezet\u00e9sre ker\u00fcl.<\/p>\n

\"Et\u00fcd<\/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.<\/h3>\n

\nAn\u00e9lk\u00fcl, hogy m\u00e9lyen belemer\u00fcln\u00e9nk a t\u00e9m\u00e1ba, az al\u00e1bbi m\u00f3don k\u00f6rvonalazhat\u00f3 a feladat: van egy t\u00e1bl\u00e1zat, amely egy \u00fczleti entit\u00e1st val\u00f3s\u00edt meg. A t\u00e1bl\u00e1zat sorai t\u00f6r\u00f6lhet\u0151ek, de fizikailag nem szabad \u0151ket t\u00f6r\u00f6lni, el kell rejteni \u0151ket. <\/p>\n

Mert mondt\u00e1k \u2014 \u201eSemmit ne t\u00f6r\u00f6lj, csak nevezd \u00e1t. Az internet mindent meg\u0151riz.\u201d <\/b><\/p>\n

<\/i> Mell\u00e9kesen, lehet\u0151leg ne \u00edrjuk \u00e1t a m\u00e1r megl\u00e9v\u0151 t\u00e1rolt funkci\u00f3kat, amelyek ezzel az entit\u00e1ssal m\u0171k\u00f6dnek.<\/p>\n

A koncepci\u00f3 megval\u00f3s\u00edt\u00e1s\u00e1hoz a t\u00e1bl\u00e1zatnak van egy attrib\u00fatuma is_deleted<\/i>. Ezut\u00e1n minden egyszer\u0171 \u2014 \u00fagy kell megval\u00f3s\u00edtani, hogy az \u00fcgyf\u00e9l csak azokat a sorokat l\u00e1thassa, amelyek eset\u00e9ben az attrib\u00fatum is_deleted<\/i> hamis. Ehhez haszn\u00e1ljuk a mechanizmust Row Level Security.<\/b><\/p>\n

Megval\u00f3s\u00edt\u00e1s<\/h3>\n

\nL\u00e9trehozunk egy k\u00fcl\u00f6n szerepk\u00f6rt \u00e9s s\u00e9m\u00e1t<\/p>\n

CREATE ROLE repos;\nCREATE SCHEMA repos;<\/code><\/pre>\n
\nL\u00e9trehozzuk a c\u00e9l t\u00e1bl\u00e1zatot<\/p>\n
CREATE TABLE repos.file\n(\n...\nis_del BOOLEAN DEFAULT FALSE\n);\nCREATE SCHEMA repos<\/code><\/pre>\n
\nEnged\u00e9lyezz\u00fck 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
\nSzolg\u00e1ltat\u00f3 funkci\u00f3<\/b> \u2014 egy sor t\u00f6rl\u00e9se a t\u00e1bl\u00e1zatban<\/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
\n\u00dczleti funkci\u00f3<\/b> \u2014 dokumentum t\u00f6rl\u00e9se<\/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
Eredm\u00e9nyek<\/h3>\n
\nAz \u00fcgyf\u00e9l t\u00f6rli a dokumentumot<\/p>\n
SELECT business_functions.delCFile( (SELECT json_build_object( 'CId', 3 )) );<\/code><\/pre>\n
\nA t\u00f6rl\u00e9s ut\u00e1n az \u00fcgyf\u00e9l nem l\u00e1tja a dokumentumot<\/p>\n
SELECT business_functions.getCFile( (SELECT json_build_object( 'CId', 3 )) ) ;\n-----------------\n(0 rows)<\/code><\/pre>\n
\nDe az adatb\u00e1zisban a dokumentum nem t\u00f6rl\u0151dik, csak az attrib\u00fatum v\u00e1ltozik 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
\nAmit a feladat ki\u00edr\u00e1sa megk\u00f6vetelt. <\/p>\n
Result<\/h2>\n
\nHa a t\u00e9ma \u00e9rdekes, a k\u00f6vetkez\u0151 tanulm\u00e1nyban bemutathatjuk a szerepmodelek megval\u00f3s\u00edt\u00e1s\u00e1t az adatokhoz val\u00f3 hozz\u00e1f\u00e9r\u00e9s eloszt\u00e1s\u00e1ra a Row Level Security, azaz a sor szint\u0171 biztons\u00e1g alkalmaz\u00e1s\u00e1val.
\n
Forr\u00e1s: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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