mirror of
https://github.com/chatmail/core.git
synced 2026-04-17 21:46:35 +03:00
bfa641cea8
- Replace .ok_or_else() and .map_err() with anyhow::Context where possible. - Use .context() to check Option for None when it's an error - Resultify Chatlist.get_chat_id() - Add useful .context() to some errors - IMAP error handling cleanup
590 lines
19 KiB
Rust
590 lines
19 KiB
Rust
//! OpenPGP helper module using [rPGP facilities](https://github.com/rpgp/rpgp).
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use std::collections::{BTreeMap, HashSet};
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use std::io;
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use std::io::Cursor;
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use anyhow::{bail, ensure, format_err, Context as _, Result};
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use pgp::armor::BlockType;
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use pgp::composed::{
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Deserializable, KeyType as PgpKeyType, Message, SecretKeyParamsBuilder, SignedPublicKey,
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SignedPublicSubKey, SignedSecretKey, StandaloneSignature, SubkeyParamsBuilder,
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};
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use pgp::crypto::{HashAlgorithm, SymmetricKeyAlgorithm};
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use pgp::types::{
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CompressionAlgorithm, KeyTrait, Mpi, PublicKeyTrait, SecretKeyTrait, StringToKey,
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};
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use rand::{thread_rng, CryptoRng, Rng};
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use crate::constants::KeyGenType;
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use crate::dc_tools::EmailAddress;
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use crate::key::{DcKey, Fingerprint};
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use crate::keyring::Keyring;
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pub const HEADER_AUTOCRYPT: &str = "autocrypt-prefer-encrypt";
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pub const HEADER_SETUPCODE: &str = "passphrase-begin";
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/// A wrapper for rPGP public key types
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#[derive(Debug)]
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enum SignedPublicKeyOrSubkey<'a> {
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Key(&'a SignedPublicKey),
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Subkey(&'a SignedPublicSubKey),
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}
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impl<'a> KeyTrait for SignedPublicKeyOrSubkey<'a> {
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fn fingerprint(&self) -> Vec<u8> {
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match self {
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Self::Key(k) => k.fingerprint(),
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Self::Subkey(k) => k.fingerprint(),
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}
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}
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fn key_id(&self) -> pgp::types::KeyId {
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match self {
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Self::Key(k) => k.key_id(),
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Self::Subkey(k) => k.key_id(),
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}
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}
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fn algorithm(&self) -> pgp::crypto::PublicKeyAlgorithm {
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match self {
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Self::Key(k) => k.algorithm(),
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Self::Subkey(k) => k.algorithm(),
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}
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}
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}
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impl<'a> PublicKeyTrait for SignedPublicKeyOrSubkey<'a> {
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fn verify_signature(
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&self,
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hash: HashAlgorithm,
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data: &[u8],
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sig: &[Mpi],
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) -> pgp::errors::Result<()> {
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match self {
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Self::Key(k) => k.verify_signature(hash, data, sig),
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Self::Subkey(k) => k.verify_signature(hash, data, sig),
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}
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}
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fn encrypt<R: Rng + CryptoRng>(
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&self,
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rng: &mut R,
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plain: &[u8],
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) -> pgp::errors::Result<Vec<Mpi>> {
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match self {
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Self::Key(k) => k.encrypt(rng, plain),
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Self::Subkey(k) => k.encrypt(rng, plain),
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}
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}
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fn to_writer_old(&self, writer: &mut impl io::Write) -> pgp::errors::Result<()> {
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match self {
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Self::Key(k) => k.to_writer_old(writer),
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Self::Subkey(k) => k.to_writer_old(writer),
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}
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}
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}
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/// Split data from PGP Armored Data as defined in <https://tools.ietf.org/html/rfc4880#section-6.2>.
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///
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/// Returns (type, headers, base64 encoded body).
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pub fn split_armored_data(buf: &[u8]) -> Result<(BlockType, BTreeMap<String, String>, Vec<u8>)> {
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use std::io::Read;
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let cursor = Cursor::new(buf);
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let mut dearmor = pgp::armor::Dearmor::new(cursor);
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let mut bytes = Vec::with_capacity(buf.len());
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dearmor.read_to_end(&mut bytes)?;
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ensure!(dearmor.typ.is_some(), "Failed to parse type");
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let typ = dearmor.typ.unwrap();
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// normalize headers
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let headers = dearmor
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.headers
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.into_iter()
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.map(|(key, value)| (key.trim().to_lowercase(), value.trim().to_string()))
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.collect();
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Ok((typ, headers, bytes))
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}
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/// Error with generating a PGP keypair.
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///
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/// Most of these are likely coding errors rather than user errors
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/// since all variability is hardcoded.
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#[derive(Debug, thiserror::Error)]
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#[error("PgpKeygenError: {message}")]
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pub struct PgpKeygenError {
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message: String,
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#[source]
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cause: anyhow::Error,
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}
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impl PgpKeygenError {
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fn new(message: impl Into<String>, cause: impl Into<anyhow::Error>) -> Self {
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Self {
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message: message.into(),
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cause: cause.into(),
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}
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}
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}
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/// A PGP keypair.
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///
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/// This has it's own struct to be able to keep the public and secret
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/// keys together as they are one unit.
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#[derive(Debug, Clone, Eq, PartialEq)]
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pub struct KeyPair {
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pub addr: EmailAddress,
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pub public: SignedPublicKey,
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pub secret: SignedSecretKey,
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}
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/// Create a new key pair.
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pub(crate) fn create_keypair(
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addr: EmailAddress,
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keygen_type: KeyGenType,
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) -> std::result::Result<KeyPair, PgpKeygenError> {
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let (secret_key_type, public_key_type) = match keygen_type {
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KeyGenType::Rsa2048 => (PgpKeyType::Rsa(2048), PgpKeyType::Rsa(2048)),
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KeyGenType::Ed25519 | KeyGenType::Default => (PgpKeyType::EdDSA, PgpKeyType::ECDH),
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};
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let user_id = format!("<{}>", addr);
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let key_params = SecretKeyParamsBuilder::default()
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.key_type(secret_key_type)
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.can_create_certificates(true)
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.can_sign(true)
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.primary_user_id(user_id)
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.passphrase(None)
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.preferred_symmetric_algorithms(smallvec![
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SymmetricKeyAlgorithm::AES256,
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SymmetricKeyAlgorithm::AES192,
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SymmetricKeyAlgorithm::AES128,
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])
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.preferred_hash_algorithms(smallvec![
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HashAlgorithm::SHA2_256,
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HashAlgorithm::SHA2_384,
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HashAlgorithm::SHA2_512,
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HashAlgorithm::SHA2_224,
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HashAlgorithm::SHA1,
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])
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.preferred_compression_algorithms(smallvec![
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CompressionAlgorithm::ZLIB,
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CompressionAlgorithm::ZIP,
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])
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.subkey(
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SubkeyParamsBuilder::default()
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.key_type(public_key_type)
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.can_encrypt(true)
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.passphrase(None)
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.build()
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.unwrap(),
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)
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.build()
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.map_err(|err| PgpKeygenError::new("invalid key params", format_err!(err)))?;
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let key = key_params
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.generate()
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.map_err(|err| PgpKeygenError::new("invalid params", err))?;
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let private_key = key.sign(|| "".into()).expect("failed to sign secret key");
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let public_key = private_key.public_key();
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let public_key = public_key
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.sign(&private_key, || "".into())
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.map_err(|err| PgpKeygenError::new("failed to sign public key", err))?;
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private_key
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.verify()
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.map_err(|err| PgpKeygenError::new("invalid private key generated", err))?;
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public_key
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.verify()
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.map_err(|err| PgpKeygenError::new("invalid public key generated", err))?;
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Ok(KeyPair {
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addr,
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public: public_key,
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secret: private_key,
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})
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}
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/// Select public key or subkey to use for encryption.
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///
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/// First, tries to use subkeys. If none of the subkeys are suitable
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/// for encryption, tries to use primary key. Returns `None` if the public
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/// key cannot be used for encryption.
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///
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/// TODO: take key flags and expiration dates into account
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fn select_pk_for_encryption(key: &SignedPublicKey) -> Option<SignedPublicKeyOrSubkey> {
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key.public_subkeys
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.iter()
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.find(|subkey| subkey.is_encryption_key())
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.map_or_else(
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|| {
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// No usable subkey found, try primary key
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if key.is_encryption_key() {
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Some(SignedPublicKeyOrSubkey::Key(key))
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} else {
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None
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}
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},
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|subkey| Some(SignedPublicKeyOrSubkey::Subkey(subkey)),
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)
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}
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/// Encrypts `plain` text using `public_keys_for_encryption`
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/// and signs it using `private_key_for_signing`.
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pub async fn pk_encrypt(
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plain: &[u8],
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public_keys_for_encryption: Keyring<SignedPublicKey>,
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private_key_for_signing: Option<SignedSecretKey>,
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) -> Result<String> {
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let lit_msg = Message::new_literal_bytes("", plain);
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async_std::task::spawn_blocking(move || {
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let pkeys: Vec<SignedPublicKeyOrSubkey> = public_keys_for_encryption
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.keys()
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.iter()
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.filter_map(select_pk_for_encryption)
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.collect();
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let pkeys_refs: Vec<&SignedPublicKeyOrSubkey> = pkeys.iter().collect();
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let mut rng = thread_rng();
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// TODO: measure time
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let encrypted_msg = if let Some(ref skey) = private_key_for_signing {
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lit_msg
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.sign(skey, || "".into(), Default::default())
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.and_then(|msg| msg.compress(CompressionAlgorithm::ZLIB))
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.and_then(|msg| msg.encrypt_to_keys(&mut rng, Default::default(), &pkeys_refs))
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} else {
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lit_msg.encrypt_to_keys(&mut rng, Default::default(), &pkeys_refs)
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};
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let msg = encrypted_msg?;
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let encoded_msg = msg.to_armored_string(None)?;
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Ok(encoded_msg)
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})
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.await
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}
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/// Decrypts the message with keys from the private key keyring.
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///
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/// Receiver private keys are provided in
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/// `private_keys_for_decryption`.
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///
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/// Returns decrypted message and fingerprints
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/// of all keys from the `public_keys_for_validation` keyring that
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/// have valid signatures there.
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#[allow(clippy::implicit_hasher)]
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pub async fn pk_decrypt(
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ctext: Vec<u8>,
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private_keys_for_decryption: Keyring<SignedSecretKey>,
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public_keys_for_validation: &Keyring<SignedPublicKey>,
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) -> Result<(Vec<u8>, HashSet<Fingerprint>)> {
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let mut ret_signature_fingerprints: HashSet<Fingerprint> = Default::default();
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let msgs = async_std::task::spawn_blocking(move || {
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let cursor = Cursor::new(ctext);
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let (msg, _) = Message::from_armor_single(cursor)?;
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let skeys: Vec<&SignedSecretKey> = private_keys_for_decryption.keys().iter().collect();
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let (decryptor, _) = msg.decrypt(|| "".into(), || "".into(), &skeys[..])?;
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decryptor.collect::<pgp::errors::Result<Vec<_>>>()
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})
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.await?;
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if let Some(msg) = msgs.into_iter().next() {
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// get_content() will decompress the message if needed,
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// but this avoids decompressing it again to check signatures
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let msg = msg.decompress()?;
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let content = match msg.get_content()? {
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Some(content) => content,
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None => bail!("The decrypted message is empty"),
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};
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if !public_keys_for_validation.is_empty() {
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let pkeys = public_keys_for_validation.keys();
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let mut fingerprints: Vec<Fingerprint> = Vec::new();
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if let signed_msg @ pgp::composed::Message::Signed { .. } = msg {
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for pkey in pkeys {
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if signed_msg.verify(&pkey.primary_key).is_ok() {
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let fp = DcKey::fingerprint(pkey);
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fingerprints.push(fp);
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}
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}
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}
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ret_signature_fingerprints.extend(fingerprints);
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}
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Ok((content, ret_signature_fingerprints))
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} else {
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bail!("No valid messages found");
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}
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}
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/// Validates detached signature.
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pub async fn pk_validate(
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content: &[u8],
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signature: &[u8],
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public_keys_for_validation: &Keyring<SignedPublicKey>,
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) -> Result<HashSet<Fingerprint>> {
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let mut ret: HashSet<Fingerprint> = Default::default();
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let standalone_signature = StandaloneSignature::from_armor_single(Cursor::new(signature))?.0;
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let pkeys = public_keys_for_validation.keys();
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// Remove trailing CRLF before the delimiter.
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// According to RFC 3156 it is considered to be part of the MIME delimiter for the purpose of
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// OpenPGP signature calculation.
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let content = content
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.get(..content.len().saturating_sub(2))
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.context("index is out of range")?;
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for pkey in pkeys {
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if standalone_signature.verify(pkey, content).is_ok() {
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let fp = DcKey::fingerprint(pkey);
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ret.insert(fp);
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}
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}
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Ok(ret)
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}
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/// Symmetric encryption.
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pub async fn symm_encrypt(passphrase: &str, plain: &[u8]) -> Result<String> {
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let lit_msg = Message::new_literal_bytes("", plain);
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let passphrase = passphrase.to_string();
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async_std::task::spawn_blocking(move || {
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let mut rng = thread_rng();
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let s2k = StringToKey::new_default(&mut rng);
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let msg =
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lit_msg.encrypt_with_password(&mut rng, s2k, Default::default(), || passphrase)?;
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let encoded_msg = msg.to_armored_string(None)?;
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Ok(encoded_msg)
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})
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.await
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}
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/// Symmetric decryption.
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pub async fn symm_decrypt<T: std::io::Read + std::io::Seek>(
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passphrase: &str,
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ctext: T,
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) -> Result<Vec<u8>> {
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let (enc_msg, _) = Message::from_armor_single(ctext)?;
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let passphrase = passphrase.to_string();
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async_std::task::spawn_blocking(move || {
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let decryptor = enc_msg.decrypt_with_password(|| passphrase)?;
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let msgs = decryptor.collect::<pgp::errors::Result<Vec<_>>>()?;
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if let Some(msg) = msgs.first() {
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match msg.get_content()? {
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Some(content) => Ok(content),
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None => bail!("Decrypted message is empty"),
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}
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} else {
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bail!("No valid messages found")
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}
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})
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.await
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::test_utils::{alice_keypair, bob_keypair};
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use once_cell::sync::Lazy;
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#[test]
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fn test_split_armored_data_1() {
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let (typ, _headers, base64) = split_armored_data(
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b"-----BEGIN PGP MESSAGE-----\nNoVal:\n\naGVsbG8gd29ybGQ=\n-----END PGP MESSAGE----",
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)
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.unwrap();
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assert_eq!(typ, BlockType::Message);
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assert!(!base64.is_empty());
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assert_eq!(
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std::string::String::from_utf8(base64).unwrap(),
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"hello world"
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);
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}
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#[test]
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fn test_split_armored_data_2() {
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let (typ, headers, base64) = split_armored_data(
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b"-----BEGIN PGP PRIVATE KEY BLOCK-----\nAutocrypt-Prefer-Encrypt: mutual \n\naGVsbG8gd29ybGQ=\n-----END PGP PRIVATE KEY BLOCK-----"
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)
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.unwrap();
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assert_eq!(typ, BlockType::PrivateKey);
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assert!(!base64.is_empty());
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assert_eq!(headers.get(HEADER_AUTOCRYPT), Some(&"mutual".to_string()));
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}
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#[test]
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fn test_create_keypair() {
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let keypair0 = create_keypair(
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EmailAddress::new("foo@bar.de").unwrap(),
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KeyGenType::Default,
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)
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.unwrap();
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let keypair1 = create_keypair(
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EmailAddress::new("two@zwo.de").unwrap(),
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KeyGenType::Default,
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)
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.unwrap();
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assert_ne!(keypair0.public, keypair1.public);
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}
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/// [Key] objects to use in tests.
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struct TestKeys {
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alice_secret: SignedSecretKey,
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alice_public: SignedPublicKey,
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bob_secret: SignedSecretKey,
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bob_public: SignedPublicKey,
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}
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impl TestKeys {
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fn new() -> TestKeys {
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let alice = alice_keypair();
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let bob = bob_keypair();
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TestKeys {
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alice_secret: alice.secret.clone(),
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alice_public: alice.public,
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bob_secret: bob.secret.clone(),
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bob_public: bob.public,
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}
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}
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}
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/// The original text of [CTEXT_SIGNED]
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static CLEARTEXT: &[u8] = b"This is a test";
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/// Initialised [TestKeys] for tests.
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static KEYS: Lazy<TestKeys> = Lazy::new(TestKeys::new);
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/// A cyphertext encrypted to Alice & Bob, signed by Alice.
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static CTEXT_SIGNED: Lazy<String> = Lazy::new(|| {
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let mut keyring = Keyring::new();
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keyring.add(KEYS.alice_public.clone());
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keyring.add(KEYS.bob_public.clone());
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futures_lite::future::block_on(pk_encrypt(
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CLEARTEXT,
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keyring,
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Some(KEYS.alice_secret.clone()),
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))
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.unwrap()
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});
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/// A cyphertext encrypted to Alice & Bob, not signed.
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static CTEXT_UNSIGNED: Lazy<String> = Lazy::new(|| {
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let mut keyring = Keyring::new();
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keyring.add(KEYS.alice_public.clone());
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keyring.add(KEYS.bob_public.clone());
|
||
futures_lite::future::block_on(pk_encrypt(CLEARTEXT, keyring, None)).unwrap()
|
||
});
|
||
|
||
#[test]
|
||
fn test_encrypt_signed() {
|
||
assert!(!CTEXT_SIGNED.is_empty());
|
||
assert!(CTEXT_SIGNED.starts_with("-----BEGIN PGP MESSAGE-----"));
|
||
}
|
||
|
||
#[test]
|
||
fn test_encrypt_unsigned() {
|
||
assert!(!CTEXT_UNSIGNED.is_empty());
|
||
assert!(CTEXT_UNSIGNED.starts_with("-----BEGIN PGP MESSAGE-----"));
|
||
}
|
||
|
||
#[async_std::test]
|
||
async fn test_decrypt_singed() {
|
||
// Check decrypting as Alice
|
||
let mut decrypt_keyring: Keyring<SignedSecretKey> = Keyring::new();
|
||
decrypt_keyring.add(KEYS.alice_secret.clone());
|
||
let mut sig_check_keyring: Keyring<SignedPublicKey> = Keyring::new();
|
||
sig_check_keyring.add(KEYS.alice_public.clone());
|
||
let (plain, valid_signatures) = pk_decrypt(
|
||
CTEXT_SIGNED.as_bytes().to_vec(),
|
||
decrypt_keyring,
|
||
&sig_check_keyring,
|
||
)
|
||
.await
|
||
.unwrap();
|
||
assert_eq!(plain, CLEARTEXT);
|
||
assert_eq!(valid_signatures.len(), 1);
|
||
|
||
// Check decrypting as Bob
|
||
let mut decrypt_keyring = Keyring::new();
|
||
decrypt_keyring.add(KEYS.bob_secret.clone());
|
||
let mut sig_check_keyring = Keyring::new();
|
||
sig_check_keyring.add(KEYS.alice_public.clone());
|
||
let (plain, valid_signatures) = pk_decrypt(
|
||
CTEXT_SIGNED.as_bytes().to_vec(),
|
||
decrypt_keyring,
|
||
&sig_check_keyring,
|
||
)
|
||
.await
|
||
.unwrap();
|
||
assert_eq!(plain, CLEARTEXT);
|
||
assert_eq!(valid_signatures.len(), 1);
|
||
}
|
||
|
||
#[async_std::test]
|
||
async fn test_decrypt_no_sig_check() {
|
||
let mut keyring = Keyring::new();
|
||
keyring.add(KEYS.alice_secret.clone());
|
||
let empty_keyring = Keyring::new();
|
||
let (plain, valid_signatures) =
|
||
pk_decrypt(CTEXT_SIGNED.as_bytes().to_vec(), keyring, &empty_keyring)
|
||
.await
|
||
.unwrap();
|
||
assert_eq!(plain, CLEARTEXT);
|
||
assert_eq!(valid_signatures.len(), 0);
|
||
}
|
||
|
||
#[async_std::test]
|
||
async fn test_decrypt_signed_no_key() {
|
||
// The validation does not have the public key of the signer.
|
||
let mut decrypt_keyring = Keyring::new();
|
||
decrypt_keyring.add(KEYS.bob_secret.clone());
|
||
let mut sig_check_keyring = Keyring::new();
|
||
sig_check_keyring.add(KEYS.bob_public.clone());
|
||
let (plain, valid_signatures) = pk_decrypt(
|
||
CTEXT_SIGNED.as_bytes().to_vec(),
|
||
decrypt_keyring,
|
||
&sig_check_keyring,
|
||
)
|
||
.await
|
||
.unwrap();
|
||
assert_eq!(plain, CLEARTEXT);
|
||
assert_eq!(valid_signatures.len(), 0);
|
||
}
|
||
|
||
#[async_std::test]
|
||
async fn test_decrypt_unsigned() {
|
||
let mut decrypt_keyring = Keyring::new();
|
||
decrypt_keyring.add(KEYS.bob_secret.clone());
|
||
let sig_check_keyring = Keyring::new();
|
||
let (plain, valid_signatures) = pk_decrypt(
|
||
CTEXT_UNSIGNED.as_bytes().to_vec(),
|
||
decrypt_keyring,
|
||
&sig_check_keyring,
|
||
)
|
||
.await
|
||
.unwrap();
|
||
assert_eq!(plain, CLEARTEXT);
|
||
assert_eq!(valid_signatures.len(), 0);
|
||
}
|
||
}
|