Re: [exim] safe handling of $tls_sni

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Autor: Mike Brudenell
Data:  
A: Exim Users
Assumpte: Re: [exim] safe handling of $tls_sni
Hah! That would be a good reason! :-)
And re-reading the *Specification* I now spot it saying "The string must
consist entirely of decimal digits." (Sigh!)

I was led astray because when I searched with Google I didn't find mention
of Base62 only converting numbers, and indeed I found a web page to convert
arbitrary text to Base 62.

Hmm… I wonder if it's only Exim's implementation of the base62 expansion
operator that imposes the numeric-only requirement, rather than the method
as a whole?

Cheers and apologies,
Mike B-)

On 19 October 2016 at 13:27, Felipe Gasper <felipe@???> wrote:

> base62 only encodes numerals, though.
>
> -FG
>
> > On Oct 19, 2016, at 4:16 AM, Mike Brudenell <mike.brudenell@???>
> wrote:
> >
> > Or perhaps just use Exim's existing base62 and base62d expansion
> operators?
> > :-)
> >
> > http://www.exim.org/exim-html-current/doc/html/spec_html/ch-
> string_expansions.html#SECTexpop
> >
> >
> > These:
> >
> > - use the character set [A-Za-z0-9] on case-sensitive systems;
> > - use base36 encoding using [A-Z0-9] instead on systems with
> > case-insensitive file names;
> > - are used by Exim to generate its message identifiers, and hence
> > (presumably safe!) file names to store message data in the file system.
> >
> > Cheers,
> > Mike B-)
> >
> >
> > On 18 October 2016 at 22:21, Phil Pennock <exim-users@???>
> wrote:
> >
> >> On 2016-10-18 at 08:28 +0200, Arkadiusz Miśkiewicz wrote:
> >>> On Monday 17 of October 2016, Phil Pennock wrote:
> >>>> Or base64-encode it.
> >>>
> >>> "/" is part of base64 alphabet, so would have to replace that with
> other
> >>> character, too.
> >>
> >> You're quite right. I was thinking of the `base64url` encoding from
> >> RFC4648; it's used so often that I forgot.
> >
> >
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