{"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\/cs\/blog\/administrirovanie\/etyud-po-realizaczii-row-level-secutity-v-postgresql","title":{"rendered":"Studie implementace Row Level Security v PostgreSQL","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Jako dopln\u011bk k Studie o implementaci obchodn\u00ed logiky na \u00farovni ulo\u017een\u00fdch funkc\u00ed PostgreSQL<\/a><\/noindex> a p\u0159edev\u0161\u00edm pro podrobnou odpov\u011b\u010f<\/b> na koment\u00e1\u0159<\/a><\/noindex>.<\/p>\n

Teoretick\u00e1 \u010d\u00e1st je v\u00fdborn\u011b pops\u00e1na v dokumentaci Postgres Pro<\/a><\/noindex> \u2014 Politiky ochrany \u0159\u00e1dk\u016f<\/a><\/noindex>. N\u00ed\u017ee je uvedena praktick\u00e1 realizace mal\u00e9 konkr\u00e9tn\u00ed obchodn\u00ed \u00falohy \u2014 skryt\u00ed smazan\u00fdch dat.<\/b> Esej se v\u011bnuje implementaci rolov\u00e9ho modelu s vyu\u017eit\u00edm RLS<\/a><\/noindex><\/b> je prezentov\u00e1na samostatn\u011b.<\/p>\n

\"Studie<\/p>\n

V \u010dl\u00e1nku nen\u00ed nic nov\u00e9ho, \u017e\u00e1dn\u00fd skryt\u00fd smysl ani tajn\u00e9 znalosti. Jen skica o praktick\u00e9 realizaci teoretick\u00e9 my\u0161lenky. Pokud m\u00e1 n\u011bkdo z\u00e1jem \u2014 \u010dtete. Kdo nem\u00e1 z\u00e1jem \u2014 neztr\u00e1cejte zbyte\u010dn\u011b \u010das.<\/p><\/blockquote>\n

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

Formulace \u00fakolu<\/h3>\n

\nP\u0159i nezab\u00edh\u00e1n\u00ed do hloubky dan\u00e9 problematiky lze \u00fakol stru\u010dn\u011b formulovat n\u00e1sleduj\u00edc\u00edm zp\u016fsobem: existuje tabulka implementuj\u00edc\u00ed ur\u010dit\u00fd obchodn\u00ed objekt. \u0158\u00e1dky v tabulce mohou b\u00fdt odstra\u0148ov\u00e1ny, ale fyzicky je nelze mazat, je t\u0159eba je skr\u00fdt. <\/p>\n

Nebo\u0165 je \u0159e\u010deno \u2014 \u201eNic nemazat, jen p\u0159ejmenov\u00e1vat. Internet uchov\u00e1v\u00e1 V\u0160E\u201c <\/b><\/p>\n

<\/i> Sou\u010dasn\u011b je \u017e\u00e1douc\u00ed nep\u0159episovat ji\u017e existuj\u00edc\u00ed ulo\u017een\u00e9 funkce pracuj\u00edc\u00ed s t\u00edmto objektem.<\/p>\n

Pro implementaci tohoto konceptu m\u00e1 tabulka atribut is_deleted<\/i>. D\u00e1le je v\u0161e jednoduch\u00e9 \u2014 je t\u0159eba zajistit, aby klient mohl vid\u011bt pouze \u0159\u00e1dky, ve kter\u00fdch je atribut is_deleted<\/i> nepravdiv\u00fd. Pro co se pou\u017e\u00edv\u00e1 mechanismus Row Level Security.<\/b><\/p>\n

Implementace<\/h3>\n

\nVytv\u00e1\u0159\u00edme samostatnou roli a sch\u00e9ma<\/p>\n

CREATE ROLE repos;\nCREATE SCHEMA repos;<\/code><\/pre>\n
\nVytv\u00e1\u0159\u00edme c\u00edlovou tabulku<\/p>\n
CREATE TABLE repos.file\n(\n...\nis_del BOOLEAN DEFAULT FALSE\n);\nCREATE SCHEMA repos<\/code><\/pre>\n
\nAktivujeme 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
\nSlu\u017eebn\u00ed funkce<\/b> \u2014 odstran\u011bn\u00ed \u0159\u00e1dku v tabulce<\/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
\nObchodn\u00ed funkce<\/b> \u2014 odstran\u011bn\u00ed dokumentu<\/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
V\u00fdsledky<\/h3>\n
\nKlient odstranuje dokument<\/p>\n
SELECT business_functions.delCFile( (SELECT json_build_object( 'CId', 3 )) );<\/code><\/pre>\n
\nPo odstran\u011bn\u00ed klient dokument nevid\u00ed<\/p>\n
SELECT business_functions.getCFile( (SELECT json_build_object( 'CId', 3 )) ) ;\n-----------------\n(0 \u0159\u00e1dk\u016f)<\/code><\/pre>\n
\nAle v datab\u00e1zi dokument nebyl odstran\u011bn, pouze byl zm\u011bn\u011bn atribut 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
\nCo\u017e bylo po\u017eadov\u00e1no v zad\u00e1n\u00ed \u00fakolu. <\/p>\n
V\u00fdsledek<\/h2>\n
\nPokud bude t\u00e9ma zaj\u00edmav\u00e9, v dal\u0161\u00edm etudu m\u016f\u017eeme uk\u00e1zat p\u0159\u00edklad implementace rolov\u00e9ho modelu d\u011blen\u00ed p\u0159\u00edstupu k dat\u016fm za pou\u017eit\u00ed Row Level Security.
\n
Zdroj: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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\u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c RLS \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":92108,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-92107","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Etuda o implementaci Row Level Security v PostgreSQL | ProHoster","description":"Jako dopln\u011bn\u00ed k etudu o implementaci obchodn\u00ed logiky na \u00farovni ulo\u017een\u00fdch funkc\u00ed PostgreSQL a zejm\u00e9na pro 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