As much as I hate ASN.1 (also shared by people on the ASN.1 committee
back then), you got to love how easy it is to add things in ASN.1.
Perhaps one of the first "Object Oriented Data Model"?
On 10/30/24 10:04, Paul Kehrer via Cryptography-dev wrote:
Re-sending to list since I accidentally sent this solely to Oleg!
Sorry about that Oleg.
-Paul
On Oct 30, 2024, at 7:02 AM, Paul Kehrer <paul.l.keh...@gmail.com> wrote:
We would be willing to take support for this since it’s just some
asn.1 definitions and there’s a specification associated with it. If
the diff is larger than 400 lines then for ease of review we’ll
likely want to break this into multiple PRs, but otherwise feel free
to submit and we can discuss!
-Paul
On Oct 30, 2024, at 5:51 AM, Oleg Höfling <oleg.hoefl...@gmail.com>
wrote:
The spec I have at hand ist the
https://fachportal.gematik.de/fachportal-import/files/gemSpec_PKI_V2.10.2.pdf
which lists the Admission under section 4.8.3.2. Unfortunately, this
spec: 1. is written in german language and 2. is not complete, e.g.
it does not provide the ASN.1 syntax for the NamingAuthority. It is
however based on the Common PKI v2 specification which does provide
the complete ASN.1 spec (Table 29 and 29b). Link:
https://www.elektronische-vertrauensdienste.de/EVD/SharedDocuments/Downloads/QES/Common_PKI_v2.0_02.html
It is hosted by the Bundesnetzagentur as part of the eIDAS
regulation and not BSI, however I see that BSI mentions Common PKI
in its glossary here:
https://www.bsi.bund.de/DE/Themen/Oeffentliche-Verwaltung/Moderner-Staat/ElektronischeSignatur/Glossar/glossar_node.html
Don't shoot the messenger, but this is all I have at hand.
Kind regards,
Oleg
Am Mi., 30. Okt. 2024 um 03:29 Uhr schrieb Paul Kehrer
<paul.l.keh...@gmail.com>:
Is there a published spec that defines the ASN.1 syntax for
these extensions (maybe from BSI)? We generally like to have a
specification that we can use as a source of truth. For x509 I
don’t have any objection to adding this assuming a spec exists.
-Paul
On Oct 29, 2024, at 6:54 PM, Oleg Höfling via Cryptography-dev
<cryptography-dev@python.org> wrote:
Dear devs,
there is an X509 extension named `Admissions`, supported e.g.
by OpenSSL (https://docs.openssl.org/master/man3/ADMISSIONS/)
and BouncyCastle
(https://people.eecs.berkeley.edu/~jonah/bc/index.html?org/bouncycastle/asn1/isismtt/x509/AdmissionSyntax.html).
Would you be interested in `cryptography` supporting it as
well? This is an extension that is used in german public
healthcare and legal sectors, and I am working for one of them
:-) I really enjoy working with `cryptography` for reading out
and persisting X509 certificates, but dealing with the
`Admissions` extension requires me adding extra dependencies
and writing extra code using other libraries I do not enjoy
this much.
If you agree that it could be a viable addition to the project,
I would gladly contribute the necessary bits myself. I made a
proof-of-concept implementation for the Admissions extension in
my fork of `cryptography` to have something to discuss:
https://github.com/pyca/cryptography/compare/main...hoefling:cryptography:admission-extension?expand=1
Example script that creates a certificate with an admission
extension that has some dummy values:
https://gist.github.com/hoefling/fa290eb33b24a2e5405cf9cdeeda03bc
Of course, this is far from the state where it can be reviewed,
should be split into smaller patches, is missing tests and docs
etc etc.
If you reject the idea, I would try and put the code in a
separate library that depends on `cryptography` and connect
them together somehow. I would be grateful for any advices on
that matter - maybe you already had a case with a third party
extension for `cryptography` being built.
Last but not least - I really enjoyed hacking the working
prototype together and fiddling with the Rust backend, kudos
for having such a clear and concise API design!
Kind regards,
Oleg
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