[stunnel-users] stunnel-users Digest, Vol 135, Issue 19

[Reese Wilson]

Unfortunately that's not an option for our use case

On Thu, Oct 29, 2015 at 4:00 AM <stunnel-users-request at stunnel.org> wrote:

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> Today's Topics:
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>    1. hex key support for psk (Reese Wilson)
>    2. Re: hex key support for psk (Michal Trojnara)
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 28 Oct 2015 23:12:01 +0000
> From: Reese Wilson <reesew at tzmedical.com>
> To: stunnel-users at stunnel.org
> Subject: [stunnel-users] hex key support for psk
> Message-ID:
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> CAJU_q421ksnS8mCtkc6tApdTwUXJrNBZ+69Zt_HxJMpJLGBoiA at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> I ran into an issue with PSK reading the key as ascii instead of hex. I had
> a gnutls-serv and gnutls-cli set up with a hex key, and I switched the
> server for one wrapped using stunnel, but using the same key in psk.txt was
> failing. I eventually got it working by converting the hex characters to
> binary and placing that in the contents of the file specified by PSKsecrets
> (psk.txt), but this won't work for certain scenarios. For example, what if
> the key contains ascii newline characters?
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> Message: 2
> Date: Thu, 29 Oct 2015 09:55:48 +0100
> From: Michal Trojnara <Michal.Trojnara at mirt.net>
> To: stunnel-users at stunnel.org
> Subject: Re: [stunnel-users] hex key support for psk
> Message-ID: <5631DF14.90003 at mirt.net>
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> On 29.10.2015 00:12, Reese Wilson wrote:
> > I ran into an issue with PSK reading the key as ascii instead of
> > hex. I had a gnutls-serv and gnutls-cli set up with a hex key, and
> > I switched the server for one wrapped using stunnel, but using the
> > same key in psk.txt was failing. I eventually got it working by
> > converting the hex characters to binary and placing that in the
> > contents of the file specified by PSKsecrets (psk.txt), but this
> > won't work for certain scenarios. For example, what if the key
> > contains ascii newline characters?
>
> Do it the other way around: generate sufficiently long printable ASCII
> pre-shared keys, and then hex-encode them for applications that
> require hex-encoded pre-shared keys.  The same applies to any other
> encoding (base64, rot13, etc.).
>
> Yes, the interface of stunnel restricts the subset of bytes that may
> be used for pre-shared keys (but not the length of those keys).  Yes,
> this may require generating new pre-shared keys when you migrate to
> stunnel from another product.  Yes, I consider this to be a feature.
> You can use passphrases or your favourite password generator to
> generate pre-shared keys for stunnel.  Changing the pre-shared key
> when you migrate to stunnel is also *good* for your security.
>
> Mike
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> End of stunnel-users Digest, Vol 135, Issue 19
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