Anubhav Gain

Anubhav Gain

Security Software Engineer · XDR/OXDR Architect · Rust & eBPF · 222+ Research Citations

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Granting a PostgreSQL user read-only access to some tables

Anubhav Gain

2024-03-21

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postgresql

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cli

Granting a PostgreSQL user read-only access to some tables#

I wanted to grant a PostgreSQL user (or role) read-only access to a specific list of tables.

I created the role using the Heroku PostgreSQL web console. Having done that, it had the name read-only-core-tables.

I attached it to my Heroku application using the web console, then I ran the following to get myself a default-permission terminal session:

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% heroku pg:psql postgresql-metric-59331 --app myapp

As the default user I ran the following:

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GRANT USAGE ON SCHEMA PUBLIC TO "read-only-core-tables";

This grants that user the ability to see what tables exist - after running this the \dt command for that user started showing a full list of tables.

But… select * from table returned permission denied for every table. To allow select access I ran this:

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GRANT SELECT ON TABLE
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    public.availability_tag,
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    public.county,
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    public.django_content_type,
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    public.django_migrations
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TO "read-only-core-tables";

That’s all it took - my read-only user was then able to run select * from county and see the results - but attempts to select against tables not in that allow-list were denied.

Granting a PostgreSQL user read-only access to some tables

https://mranv.pages.dev/posts/granting-a-postgresql-user-read-only-access-to-some-tables/

Author

Anubhav Gain

Published at

2024-03-21

License

CC BY-NC-SA 4.0

DevOps Best Practices Compilation

Using the undocumented Fly GraphQL API

Granting a PostgreSQL user read-only access to some tables