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keyfork-shard: Be less strict about keys 

Rationale: Keyfork Shard runs on Airgap systems. The biggest impact of
using StandardPolicy and checking whether keys are "alive" is the drift
between different Airgap systems where the keys may not be valid at the
same time. Because of this, it is impossible to shard a secret to all
keys at once using a StandardPolicy.

However, we consider these keys to be a trusted input, whether created
by a previous system or generated directly by Keyfork. Because of this,
we can use a NullPolicy to blanketly permit all keys, the same way we
blanketly permit all keys when reconstituting the sharded secret, and
disable the check for whether keys are alive (though, we are still
denying revoked keys).
This commit is contained in:
Ryan Heywood 2024-08-08 00:35:41 -04:00
parent bac762f5be
commit fa84a2ae5f
Signed by: ryan
GPG Key ID: 8E401478A3FBEF72
1 changed files with 5 additions and 4 deletions
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9
crates/keyfork-shard/src/openpgp.rs
View File

@ -25,7 +25,7 @@ use openpgp::{
stream::{DecryptionHelper, DecryptorBuilder, VerificationHelper},
Parse,
},
policy::{NullPolicy, Policy, StandardPolicy},
policy::{NullPolicy, Policy},
serialize::{
stream::{ArbitraryWriter, Encryptor2, LiteralWriter, Message, Recipient, Signer},
Marshal,
@ -276,7 +276,7 @@ impl<P: PromptHandler> Format for OpenPGP<P> {
key_data: &[Self::PublicKey],
threshold: u8,
) -> Result<Self::EncryptedData, Self::Error> {
let policy = StandardPolicy::new();
let policy = NullPolicy::new();
let mut pp = vec![SHARD_METADATA_VERSION, threshold];
// Note: Sequoia does not export private keys on a Cert, only on a TSK
signing_key
@ -362,7 +362,7 @@ impl<P: PromptHandler> Format for OpenPGP<P> {
public_key: &Cert,
signing_key: &mut Self::SigningKey,
) -> Result<EncryptedMessage> {
let policy = StandardPolicy::new();
let policy = NullPolicy::new();
let valid_cert = public_key
.with_policy(&policy, None)
.map_err(Error::Sequoia)?;
@ -577,7 +577,8 @@ fn get_encryption_keys<'a>(
openpgp::packet::key::UnspecifiedRole,
> {
cert.keys()
.alive()
// NOTE: this causes complications on Airgap systems
// .alive()
.revoked(false)
.supported()
.for_storage_encryption()