{"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\/es\/blog\/administrirovanie\/etyud-po-realizaczii-row-level-secutity-v-postgresql","title":{"rendered":"Estudio sobre la implementaci\u00f3n de Row Level Security en PostgreSQL","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Como complemento a Estudio sobre la implementaci\u00f3n de la l\u00f3gica de negocio en funciones almacenadas de PostgreSQL<\/a><\/noindex> y principalmente para una respuesta detallada<\/b> en comentario<\/a><\/noindex>.<\/p>\n

La parte te\u00f3rica est\u00e1 excelentemente descrita en la documentaci\u00f3n Postgres Pro<\/a><\/noindex> \u2014 Pol\u00edticas de protecci\u00f3n de filas<\/a><\/noindex>. A continuaci\u00f3n se presenta la implementaci\u00f3n pr\u00e1ctica de una peque\u00f1a tarea empresarial concreta: ocultar datos eliminados.<\/b> Este estudio se dedica a la implementaci\u00f3n del modelo de roles utilizando RLS<\/a><\/noindex><\/b> presentado por separado.<\/p>\n

\"Estudio<\/p>\n

El art\u00edculo no contiene nada nuevo, no hay significados ocultos ni conocimientos secretos. Simplemente es un bosquejo sobre la implementaci\u00f3n pr\u00e1ctica de una idea te\u00f3rica. Si a alguien le interesa, que lea. Si no le interesa, no pierda su tiempo en vano.<\/p><\/blockquote>\n

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

Planteamiento del problema<\/h3>\n

\nSin profundizar en el \u00e1rea tem\u00e1tica, brevemente, la tarea puede formularse de la siguiente manera: hay una tabla que implementa una cierta entidad de negocio. Las filas de la tabla pueden ser eliminadas, pero no se pueden eliminar f\u00edsicamente, deben ser ocultadas. <\/p>\n

Porque se dice: \"No elimines nada, solo renombra. Internet guarda TODO\" <\/b><\/p>\n

<\/i> Adem\u00e1s, es deseable no reescribir las funciones almacenadas existentes que operan con esta entidad.<\/p>\n

Para implementar este concepto, la tabla tiene un atributo is_deleted<\/i>. Luego, todo es simple: debe hacerse de manera que el cliente pueda ver solo las filas donde el atributo is_deleted<\/i> es falso. Para eso se utiliza el mecanismo Row Level Security.<\/b><\/p>\n

Implementaci\u00f3n<\/h3>\n

\nCreamos un rol y un esquema separados<\/p>\n

CREATE ROLE repos;\nCREATE SCHEMA repos;<\/code><\/pre>\n
\nCreamos la tabla objetivo<\/p>\n
CREATE TABLE repos.file\n(\n...\nis_del BOOLEAN DEFAULT FALSE\n);\nCREATE SCHEMA repos<\/code><\/pre>\n
\nActivamos 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
\nFunci\u00f3n de servicio<\/b> \u2014 eliminar una fila en la tabla<\/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
\nFunci\u00f3n de negocio<\/b> \u2014 eliminar un documento<\/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
Resultados<\/h3>\n
\nEl cliente elimina el documento<\/p>\n
SELECT business_functions.delCFile( (SELECT json_build_object( 'CId', 3 )) );<\/code><\/pre>\n
\nDespu\u00e9s de la eliminaci\u00f3n, el cliente del documento no ve<\/p>\n
SELECT business_functions.getCFile\"( (SELECT json_build_object( 'CId', 3 )) ) ;\n-----------------\n(0 filas)<\/code><\/pre>\n
\nPero en la base de datos el documento no se ha eliminado, solo se ha cambiado el atributo 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
\nLo que se requer\u00eda en la formulaci\u00f3n de la tarea. <\/p>\n
Summary<\/h2>\n
\nSi el tema es interesante, en el pr\u00f3ximo estudio se puede mostrar un ejemplo de implementaci\u00f3n de un modelo de roles para la separaci\u00f3n de acceso a los datos utilizando Row Level Security.
\n
Fuente: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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