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From: Daniel Gustafsson <[email protected]>
To: Laurenz Albe <[email protected]>
Cc: xx Z <[email protected]>
Cc: [email protected]
Subject: Re: How to configure client-side TLS ciphers for streaming replication?
Date: Wed, 27 Aug 2025 21:59:18 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <CA+aQVjKMYngg0AVHVOcj8veB5yqoA=HCTKe-QQ3q-AovHTB0SQ@mail.gmail.com>
	<[email protected]>
	<CA+aQVj+bq9iz-zM+s3F9_bDFGA_oZ41T-dHX=f=mMXhAP87K6w@mail.gmail.com>
	<[email protected]>

> On 26 Aug 2025, at 22:16, Laurenz Albe <[email protected]> wrote:
> 
> On Tue, 2025-08-26 at 20:34 +0800, xx Z wrote:
>> Thanks for your suggestion.
>> But I still want to know why we can't set "ssl_ciphers" on the client side.
> 
> I'd say because nobody implemented it, perhaps because nobody felt the need.

I think the former is a highly likely suspect here.

>> This is still considered a security issue in some cases, and PostgreSQL has
>> mature capabilities on the master side to implement this functionality.
> 
> That sounds to me like some moderately clueful security auditor is looking
> for a nit to pick.  If you do streaming replication, and you control the
> ciphers on the primary server, what added security benefit do you get by
> controlling the ciphers on the standby server (the client) as well?

I would place this above nitpicking, but I also don't have a clear idea of an
attack (if I did I'd fix it..).  TLS is riddled with weird cases involving
network middleboxes (usually very enterprisy) so insisting on control isn't
necessarily a bad thing.

--
Daniel Gustafsson

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