Re: User with BYPASSRLS privilege can't change password - Mailing list pgsql-bugs

From David G. Johnston
Subject Re: User with BYPASSRLS privilege can't change password
Date
Msg-id CAKFQuwavcOMqc3GqiR9GtHRxVVtUC_9_Eo-mZpwBqPxDiShD5Q@mail.gmail.com
Whole thread Raw
In response to User with BYPASSRLS privilege can't change password  (Wolfgang Walther <walther@technowledgy.de>)
Responses Re: User with BYPASSRLS privilege can't change password
List pgsql-bugs
On Tue, Nov 3, 2020 at 11:06 AM Stephen Frost <sfrost@snowman.net> wrote:

> diff --git a/src/backend/commands/user.c b/src/backend/commands/user.c
> index 9ce9a66921..5cd479a649 100644
> --- a/src/backend/commands/user.c
> +++ b/src/backend/commands/user.c
> @@ -709,8 +709,10 @@ AlterRole(AlterRoleStmt *stmt)
>       roleid = authform->oid;

>       /*
> -      * To mess with a superuser you gotta be superuser; else you need
> -      * createrole, or just want to change your own password
> +      * To mess with a superuser or replication role in any way you gotta be
> +      * superuser.  We also insist on superuser to change the BYPASSRLS
> +      * property.  Otherwise, if you don't have createrole, you're only allowed
> +      * to change your own password.
>        */
>       if (authform->rolsuper || issuper >= 0)
>       {
> @@ -726,7 +728,7 @@ AlterRole(AlterRoleStmt *stmt)
>                                       (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
>                                        errmsg("must be superuser to alter replication users")));
>       }
> -     else if (authform->rolbypassrls || bypassrls >= 0)
> +     else if (bypassrls >= 0)
>       {
>               if (!superuser())
>                       ereport(ERROR,

This change looks correct, we shouldn't be worrying about what's already
been set on the role.


Is the nuance that in reality a non-superuser cannot specify BypassRLS even if the effective value is unchanged unimportant here?

David J.

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