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fix: Reduce postgres user grants #1159

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fix: Reduce postgres user grants #1159

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e40a729
fix: Reduce postgres user grants
filipecabaco Sep 19, 2024
d4e2aed
Update lib/realtime/tenants/repo/migrations/20240919140541_reduce_gra…
filipecabaco Sep 24, 2024
38c8ba1
Update lib/realtime/tenants/repo/migrations/20240919140541_reduce_gra…
filipecabaco Sep 24, 2024
3878e86
Update lib/realtime/tenants/repo/migrations/20240919140541_reduce_gra…
filipecabaco Sep 24, 2024
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6 changes: 4 additions & 2 deletions lib/realtime/tenants/migrations.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -59,7 +59,8 @@ defmodule Realtime.Tenants.Migrations do
FixWalrusRoleHandling,
UnloggedMessagesTable,
LoggedMessagesTable,
FilterDeletePostgresChanges
FilterDeletePostgresChanges,
ReduceGrantsPostgresUser
}

@migrations [
Expand Down Expand Up @@ -109,7 +110,8 @@ defmodule Realtime.Tenants.Migrations do
{20_240_618_124_746, FixWalrusRoleHandling},
{20_240_801_235_015, UnloggedMessagesTable},
{20_240_805_133_720, LoggedMessagesTable},
{20_240_827_160_934, FilterDeletePostgresChanges}
{20_240_827_160_934, FilterDeletePostgresChanges},
{20_240_919_140_541, ReduceGrantsPostgresUser}
]
defstruct [:tenant_external_id, :settings]
@spec run_migrations(map()) :: :ok | {:error, any()}
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20 changes: 20 additions & 0 deletions lib/realtime/tenants/repo/migrations/20240919140541_reduce_grants_postgres_user.ex
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@@ -0,0 +1,20 @@
defmodule Realtime.Tenants.Migrations.ReduceGrantsPostgresUser do
@moduledoc false
use Ecto.Migration

def change do
execute("revoke supabase_realtime_admin from postgres")
execute("alter default privileges for role supabase_admin in schema realtime revoke all on tables from postgres")
execute("alter default privileges for role supabase_admin in schema realtime revoke all on functions from postgres")
execute("alter default privileges for role supabase_admin in schema realtime revoke all on sequences from postgres")
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this actually breaks our tests and implementations as supabase_admin is the user we use to connect to tenant database and we still need them 😭

so I will need to remove this 3 execute @soedirgo

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Hmm how does it break? It shouldn't affect existing tables/functions

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@filipecabaco filipecabaco Sep 25, 2024 •
edited
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running required migrations fails:

     18:14:41.532 project=dev_tenant external_id=dev_tenant [error] MigrationsFailedToRun: %Postgrex.Error{
       message: nil,
       postgres: %{
         code: :undefined_object,
         line: "5101",
         message: "role \"supabase_admin\" does not exist",
         file: "acl.c",
         unknown: "ERROR",
         severity: "ERROR",
         pg_code: "42704",
         routine: "get_role_oid"
       },
       connection_id: 156,
       query: nil
     }

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Oh we granted the default privileges here 😭 then yeah we need to move these out of Realtime tenant migrations


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execute("revoke all on table realtime.schema_migrations from postgres, anon, authenticated, service_role")
execute("grant select on table realtime.schema_migrations to postgres with grant option")

execute("revoke all on table realtime.messages from postgres, anon, authenticated, service_role")
execute("grant select, insert on table realtime.messages to postgres with grant option")

execute("revoke all on table realtime.subscription from postgres")
execute("grant select on table realtime.subscription to postgres with grant option")
end
end
2 changes: 1 addition & 1 deletion mix.exs
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Expand Up @@ -4,7 +4,7 @@ defmodule Realtime.MixProject do
def project do
[
app: :realtime,
version: "2.32.11",
version: "2.32.12",
elixir: "~> 1.16.0",
elixirc_paths: elixirc_paths(Mix.env()),
start_permanent: Mix.env() == :prod,
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