keyfork: add `bottoms-up` wizard
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142bea3b9f
commit
d5c3587343
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@ -83,7 +83,7 @@ fn validate(
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let index = DerivationIndex::new(u32::from_be_bytes(pgp_u32), true)?;
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let path = DerivationPath::from_str(path)?;
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assert_eq!(2, path.len(), "Expected path of m/{index}/account_id'");
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assert!(path.len() >= 2, "Expected path of at least m/{index}/account_id'");
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let given_index = path.iter().next().expect("checked .len() above");
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assert_eq!(
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@ -1,6 +1,11 @@
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use super::Keyfork;
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use clap::{Parser, Subcommand};
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use std::{collections::HashSet, fs::File, io::IsTerminal, path::PathBuf};
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use std::{
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collections::HashSet,
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fs::File,
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io::IsTerminal,
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path::{Path, PathBuf},
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};
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use card_backend_pcsc::PcscBackend;
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use openpgp_card_sequoia::{state::Open, types::KeyType, Card};
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@ -185,6 +190,35 @@ fn generate_shard_secret(
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Ok(())
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}
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fn bottoms_up(key_discovery: &Path, threshold: u8, output: &Option<PathBuf>) -> Result<()> {
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let seed = keyfork_entropy::generate_entropy_of_const_size::<{ 256 / 8 }>()?;
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let stdout = std::io::stdout();
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if output.is_none() {
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assert!(
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!stdout.is_terminal(),
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"not printing shard to terminal, redirect output"
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);
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}
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let opgp = OpenPGP::<DefaultTerminal>::new();
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let certs = OpenPGP::<DefaultTerminal>::discover_certs(key_discovery)?;
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if let Some(output_file) = output {
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let output = File::create(output_file)?;
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opgp.shard_and_encrypt(threshold, certs.len() as u8, &seed, &certs[..], output)?;
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} else {
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opgp.shard_and_encrypt(
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threshold,
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certs.len() as u8,
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&seed,
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&certs[..],
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std::io::stdout(),
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)?;
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}
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Ok(())
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}
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#[derive(Subcommand, Clone, Debug)]
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pub enum WizardSubcommands {
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/// Create a 256 bit secret and shard the secret to smart cards.
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@ -209,6 +243,24 @@ pub enum WizardSubcommands {
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#[arg(long)]
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output: Option<PathBuf>,
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},
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/// Create a 256 bit secret and shard the secret to previously known OpenPGP certificates,
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/// deriving the default OpenPGP certificate for the secret.
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///
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/// This command was purpose-built for DEFCON and is not intended to be used normally, as it
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/// implies keys used for sharding have been generated by a custom source.
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BottomsUp {
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/// The location of OpenPGP certificates to use when sharding.
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key_discovery: PathBuf,
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/// The minimum amount of keys required to decrypt the secret.
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#[arg(long)]
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threshold: u8,
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/// The file to write the generated shard file to.
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#[arg(long)]
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output: Option<PathBuf>,
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},
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}
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impl WizardSubcommands {
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@ -220,6 +272,11 @@ impl WizardSubcommands {
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keys_per_shard,
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output,
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} => generate_shard_secret(*threshold, *max, *keys_per_shard, output),
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WizardSubcommands::BottomsUp {
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key_discovery,
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threshold,
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output,
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} => bottoms_up(key_discovery, *threshold, output),
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}
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}
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}
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