On Sun, Jun 01, 2014 at 02:12:37PM +0100, Mike Cardwell wrote:

> Is this a bug:
> 
> root@flan:/etc/exim4# exim4 -be 
> '${certextract{signature}{${readfile{/etc/ssl/grepular.com/ssl.crt}}}{$value}}'
> Failed: no variable named "{readfile{/etc/ssl/grepular.com/ssl.crt"

IIRC the code for working with certificates uses the in-memory peer
or local certificate from the SSL connection.  Thus it cannot
process ad-hoc certificate files, especially read into memory as
untyped strings (recall that certificates can be in PEM or DER
format, ...).

> I'm not sure if it is, because the spec.txt says:
> 
> "The <certificate> must be a variable of type certificate."

An in-memory object representing the peer certificate.  One of:

        New expansion variables tls_(in,out)_(our,peer)cert, and
        expansion item certextract with support for various fields

> Is the certificate field not expandable for security reasons? If not,
> could it be made expandable and allowed to take PEM encoded
> certificates as input too?

No, not security.  Rather, certificate objects are not just some string
in memory.

-- 
        Viktor.

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