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|
use failure::{self, ResultExt};
use std::collections::HashMap;
use std::io;
use rpassword;
extern crate sequoia_openpgp as openpgp;
use sequoia_core::Context;
use openpgp::constants::SymmetricAlgorithm;
use openpgp::conversions::hex;
use openpgp::crypto::SessionKey;
use openpgp::{Fingerprint, TPK, KeyID, Result};
use openpgp::packet::{Key, key::SecretKey, Signature, PKESK, SKESK};
use openpgp::parse::PacketParser;
use openpgp::parse::stream::{
VerificationHelper, VerificationResult, DecryptionHelper, Decryptor,
};
extern crate sequoia_store as store;
use super::{dump::PacketDumper, VHelper};
struct Helper<'a> {
vhelper: VHelper<'a>,
secret_keys: HashMap<KeyID, Key>,
key_identities: HashMap<KeyID, Fingerprint>,
key_hints: HashMap<KeyID, String>,
dump_session_key: bool,
dumper: Option<PacketDumper>,
hex: bool,
}
impl<'a> Helper<'a> {
fn new(ctx: &'a Context, store: &'a mut store::Store,
signatures: usize, tpks: Vec<TPK>, secrets: Vec<TPK>,
dump_session_key: bool, dump: bool, hex: bool)
-> Self {
let mut keys: HashMap<KeyID, Key> = HashMap::new();
let mut identities: HashMap<KeyID, Fingerprint> = HashMap::new();
let mut hints: HashMap<KeyID, String> = HashMap::new();
for tsk in secrets {
let can_encrypt = |_: &Key, sig: Option<&Signature>| -> bool {
if let Some(sig) = sig {
sig.key_flags().can_encrypt_at_rest()
|| sig.key_flags().can_encrypt_for_transport()
} else {
false
}
};
let hint = match tsk.userids().nth(0) {
Some(uid) => format!("{} ({})", uid.userid(),
tsk.fingerprint().to_keyid()),
None => format!("{}", tsk.fingerprint().to_keyid()),
};
if can_encrypt(tsk.primary(), tsk.primary_key_signature()) {
let id = tsk.fingerprint().to_keyid();
keys.insert(id.clone(), tsk.primary().clone());
identities.insert(id.clone(), tsk.fingerprint());
hints.insert(id, hint.clone());
}
for skb in tsk.subkeys() {
let key = skb.subkey();
if can_encrypt(key, skb.binding_signature()) {
let id = key.fingerprint().to_keyid();
keys.insert(id.clone(), key.clone());
identities.insert(id.clone(), tsk.fingerprint());
hints.insert(id, hint.clone());
}
}
}
Helper {
vhelper: VHelper::new(ctx, store, signatures, tpks),
secret_keys: keys,
key_identities: identities,
key_hints: hints,
dump_session_key: dump_session_key,
dumper: if dump || hex {
Some(PacketDumper::new(false))
} else {
None
},
hex: hex,
}
}
}
impl<'a> VerificationHelper for Helper<'a> {
fn get_public_keys(&mut self, ids: &[KeyID]) -> Result<Vec<TPK>> {
self.vhelper.get_public_keys(ids)
}
fn check(&mut self, sigs: Vec<Vec<VerificationResult>>) -> Result<()> {
self.vhelper.check(sigs)
}
}
impl<'a> DecryptionHelper for Helper<'a> {
fn mapping(&self) -> bool {
self.hex
}
fn inspect(&mut self, pp: &PacketParser) -> Result<()> {
if let Some(dumper) = self.dumper.as_mut() {
dumper.packet(&mut io::stderr(),
pp.recursion_depth() as usize,
pp.header().clone(), pp.packet.clone(),
pp.map().map(|m| m.clone()), None)?;
}
Ok(())
}
fn decrypt<D>(&mut self, pkesks: &[PKESK], skesks: &[SKESK],
mut decrypt: D) -> openpgp::Result<Option<Fingerprint>>
where D: FnMut(SymmetricAlgorithm, &SessionKey) -> openpgp::Result<()>
{
// First, we try those keys that we can use without prompting
// for a password.
for pkesk in pkesks {
let keyid = pkesk.recipient();
if let Some(key) = self.secret_keys.get(&keyid) {
if let Some(SecretKey::Unencrypted { mpis }) = key.secret() {
if let Ok(sk) = pkesks[0].decrypt(key, mpis)
.and_then(|(algo, sk)| { decrypt(algo, &sk)?; Ok(sk) })
{
if self.dump_session_key {
eprintln!("Session key: {}", hex::encode(&sk));
}
return Ok(self.key_identities.get(keyid)
.map(|fp| fp.clone()));
}
}
}
}
// Second, we try those keys that are encrypted.
for pkesk in pkesks {
let keyid = pkesk.recipient();
if let Some(key) = self.secret_keys.get(&keyid) {
if key.secret().map(|s| ! s.is_encrypted())
.unwrap_or(true)
{
continue;
}
loop {
let p = rpassword::read_password_from_tty(Some(
&format!(
"Enter password to decrypt key {}: ",
self.key_hints.get(&keyid).unwrap())))
?.into();
if let Ok(mpis) =
key.secret().unwrap().decrypt(key.pk_algo(), &p)
{
if let Ok(sk) = pkesk.decrypt(key, &mpis)
.and_then(|(algo, sk)
|
