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Date: Fri, 27 Oct 2023 08:40:31 +0200
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To: Proxmox VE development discussion <pve-devel@lists.proxmox.com>,
=?UTF-8?Q?Fabian_Gr=C3=BCnbichler?= <f.gruenbichler@proxmox.com>
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From: Thomas Lamprecht <t.lamprecht@proxmox.com>
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Subject: Re: [pve-devel] [PATCH acme 1/5] fix #4497: add support for
external account bindings
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Am 24/10/2023 um 10:32 schrieb Fabian Gr=C3=BCnbichler:
>> # Optionally pass $tos_url to agree to the given Terms of Service
>> # POST to newAccount endpoint
>> # Expects a '201 Created' reply
>> # Saves and returns the account data
>> sub new_account {
>> - my ($self, $tos_url, %info) =3D @_;
>> + my ($self, $tos_url, $info) =3D @_;
>> my $url =3D $self->_method('newAccount');
>> =20
>> + if ($info->{'eab'}) {
>> + my $eab_hmac_key =3D decode_base64($info->{'eab'}->{hmac_key});
>> + $info->{externalAccountBinding} =3D $self->eab($info->{'eab'}->{kid}=
, $eab_hmac_key, $url);
>=20
> this means that `info` now contains both the binding, but also the inpu=
t
> including the KID (okay, this is contained in the binding as well, so
> just duplicate info) and the HMAC key, which is supposed to be secret.
> granted, it is a secret given to the user by the CA over some channel,
> and we only send it back to the CA, but some ACME implementations might=
> still reject the request because of the unexpected contents. and if the=
> user ever mixes up the CAs they are talking to, they might accidentally=
> leak the secret to the wrong entitiy.
passing %info direct around seems like a bad ABI anyway, so why not
stop doing that and construct a new hash here that only takes the
properties from info out that we actually care about?
>=20
> since `info` is directly translated to the new_account request contents=
,
> it might be better to pass in the EAB parameters on their own, and make=
> this sub take
>=20
> my ($self, $tos_url, $eab, %info) =3D @_;
>=20
> if $eab is undef -> no EAB. if it is set, generate the binding and put
> it into %info for further passing to the ACME provider.
IMO this is not really a better general API (the unconstrained passing
around of %info, while requiring further ABI breakage on any future
parameter addition, is still there).
>=20
> alternatively, it would also work to combine $tos_url and $eab into a
> new $account_params or $params hash, if we think that more parameters
> might be added in the future, or if we plan on merging new_account and
> init, like we do in PMG/PBS.
>=20
> or, as third option, we could switch the public sub new_account to take=
>=20
> my ($self, $tos_url, $contact, $eab) =3D @_;
>=20
> or
>=20
> my ($self, $tos_url, $contact, $eab, $rsa_bits) =3D @_;
>=20
> which would be more aligned with how PMG and PBS look like.
Aligning more towards PBS/PMG has it's merits, FWIW, we could also do
so with a new method, and then transform the existing one to just transfo=
rm
the parameters as needed and call into that.
>=20
> almost all of the variants are a breaking change (except if we keep the=
> signature as is, and properly extract the eab member if it is set) that=
> require a double check for any reverse dependencies. there's at least
> one internal tool that uses this as well that would need to be updated,=
> for example.
>=20
Yeah, that or adding a new method would be preferred from my side.