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This patch adds new default roles named 'pg_read_server_files', 'pg_write_server_files', 'pg_execute_server_program' which allow an administrator to GRANT to a non-superuser role the ability to access server-side files or run programs through PostgreSQL (as the user the database is running as). Having one of these roles allows a non-superuser to use server-side COPY to read, write, or with a program, and to use file_fdw (if installed by a superuser and GRANT'd USAGE on it) to read from files or run a program. The existing misc file functions are also changed to allow a user with the 'pg_read_server_files' default role to read any files on the filesystem, matching the privileges given to that role through COPY and file_fdw from above. Reviewed-By: Michael Paquier Discussion: https://postgr.es/m/20171231191939.GR2416%40tamriel.snowman.net |
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