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"registry+https://github.com/rust-lang/crates.io-index" +checksum = "735a71d46c4d68d71d4b24d03fdc2b98e38cea81730595801db779c04fe80d70" diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 00000000000..a58d4141969 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,5 @@ +[workspace] + +members = [ + "redwood", +] diff --git a/redwood/Cargo.toml b/redwood/Cargo.toml new file mode 100644 index 00000000000..8bf469cd8fe --- /dev/null +++ b/redwood/Cargo.toml @@ -0,0 +1,18 @@ +[package] +name = "redwood" +version = "0.1.0" +edition = "2021" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html +[lib] +name = "redwood" +crate-type = ["cdylib"] + +[dependencies] +anyhow = "1.0" +pyo3 = { version = "0.18.0", features = ["extension-module"] } +sequoia-openpgp = { version = "1.13.0", default-features = false, features = ["crypto-openssl", "compression"]} +thiserror = "1.0.31" + +[dev-dependencies] +tempfile = "3.3.0" diff --git a/redwood/pyproject.toml b/redwood/pyproject.toml new file mode 100644 index 00000000000..294fea852a1 --- /dev/null +++ b/redwood/pyproject.toml @@ -0,0 +1,13 @@ +[build-system] +requires = ["maturin>=1.0,<2.0"] +build-backend = "maturin" + +[project] +name = "redwood" +requires-python = ">=3.8" +classifiers = [ + "Programming Language :: Rust", +] + +[tool.maturin] +compatibility = "linux" diff --git a/redwood/redwood.pyi b/redwood/redwood.pyi new file mode 100644 index 00000000000..108073f57fb --- /dev/null +++ b/redwood/redwood.pyi @@ -0,0 +1,16 @@ +# type stub for redwood module +# see https://pyo3.rs/v0.16.4/python_typing_hints.html +from pathlib import Path +from typing import List + +def generate_source_key_pair(passphrase: str, email: str) -> (str, str, str): + pass + +def encrypt_message(recipients: List[str], plaintext: str, destination: Path) -> None: + pass + +def encrypt_file(recipients: List[str], plaintext: Path, destination: Path) -> None: + pass + +def decrypt(ciphertext: bytes, secret_key: str, passphrase: str) -> str: + pass diff --git a/redwood/src/decryption.rs b/redwood/src/decryption.rs new file mode 100644 index 00000000000..5b5891ba3ec --- /dev/null +++ b/redwood/src/decryption.rs @@ -0,0 +1,67 @@ +//! Decryption is much more complicated than encryption, +//! This code is mostly lifted from https://docs.sequoia-pgp.org/sequoia_guide/chapter_02/index.html + +use sequoia_openpgp::crypto::{Password, SessionKey}; +use sequoia_openpgp::parse::stream::*; +use sequoia_openpgp::policy::Policy; +use sequoia_openpgp::types::SymmetricAlgorithm; + +pub(crate) struct Helper<'a> { + pub(crate) policy: &'a dyn Policy, + pub(crate) secret: &'a sequoia_openpgp::Cert, + pub(crate) passphrase: &'a Password, +} + +impl<'a> VerificationHelper for Helper<'a> { + fn get_certs( + &mut self, + _ids: &[sequoia_openpgp::KeyHandle], + ) -> sequoia_openpgp::Result> { + // Return public keys for signature verification here. + Ok(Vec::new()) + } + + fn check( + &mut self, + _structure: MessageStructure, + ) -> sequoia_openpgp::Result<()> { + // Implement your signature verification policy here. + Ok(()) + } +} + +impl<'a> DecryptionHelper for Helper<'a> { + fn decrypt( + &mut self, + pkesks: &[sequoia_openpgp::packet::PKESK], + _skesks: &[sequoia_openpgp::packet::SKESK], + sym_algo: Option, + mut decrypt: D, + ) -> sequoia_openpgp::Result> + where + D: FnMut(SymmetricAlgorithm, &SessionKey) -> bool, + { + // The encryption key is the first and only subkey. + let key = self + .secret + .keys() + .secret() + .with_policy(self.policy, None) + .next() + // FIXME: unwrap() + .unwrap() + .key() + .clone(); + + // Decrypt the secret key with the specified passphrase. + let mut pair = key.decrypt_secret(self.passphrase)?.into_keypair()?; + + pkesks[0] + .decrypt(&mut pair, sym_algo) + .map(|(algo, session_key)| decrypt(algo, &session_key)); + + // XXX: In production code, return the Fingerprint of the + // recipient's Cert here + Ok(None) + } +} diff --git a/redwood/src/lib.rs b/redwood/src/lib.rs new file mode 100644 index 00000000000..28b5d1fd683 --- /dev/null +++ b/redwood/src/lib.rs @@ -0,0 +1,233 @@ +#![deny(clippy::all)] + +use pyo3::create_exception; +use pyo3::exceptions::PyException; +use pyo3::prelude::*; +use sequoia_openpgp::cert::{CertBuilder, CipherSuite}; +use sequoia_openpgp::crypto::Password; +use sequoia_openpgp::parse::{stream::DecryptorBuilder, Parse}; +use sequoia_openpgp::policy::StandardPolicy; +use sequoia_openpgp::serialize::{ + stream::{Armorer, Encryptor, LiteralWriter, Message}, + SerializeInto, +}; +use sequoia_openpgp::Cert; +use std::fs::File; +use std::io::{self, Read}; +use std::path::{Path, PathBuf}; +use std::str::FromStr; +use std::string::FromUtf8Error; +use std::time::{Duration, SystemTime}; + +/// Alias to make it easier for Python readers +type Bytes = Vec; + +mod decryption; + +#[derive(thiserror::Error, Debug)] +pub enum Error { + #[error("OpenPGP error: {0}")] + OpenPgp(#[from] anyhow::Error), + #[error("IO error: {0}")] + Io(#[from] io::Error), + #[error("Unexpected non-UTF-8 text: {0}")] + NotUnicode(#[from] FromUtf8Error), +} + +create_exception!(redwood, RedwoodError, PyException); + +impl From for PyErr { + fn from(original: Error) -> Self { + // TODO: make sure we're not losing the stacktrace here + RedwoodError::new_err(original.to_string()) + } +} + +type Result = std::result::Result; + +/// A Python module implemented in Rust. +#[pymodule] +fn redwood(py: Python, m: &PyModule) -> PyResult<()> { + m.add_function(wrap_pyfunction!(generate_source_key_pair, m)?)?; + m.add_function(wrap_pyfunction!(encrypt_message, m)?)?; + m.add_function(wrap_pyfunction!(encrypt_file, m)?)?; + m.add_function(wrap_pyfunction!(decrypt, m)?)?; + m.add("RedwoodError", py.get_type::())?; + Ok(()) +} + +/// Generate a new PGP key pair using the given email (user ID) and protected +/// with the specified passphrase. +/// Returns the public key, private key, and 40-character fingerprint +#[pyfunction] +pub fn generate_source_key_pair( + passphrase: &str, + email: &str, +) -> Result<(String, String, String)> { + let (cert, _revocation) = CertBuilder::new() + .set_cipher_suite(CipherSuite::RSA4k) + .add_userid(format!("Source Key <{}>", email)) + .set_creation_time( + // All reply keypairs will be "created" on the same day SecureDrop (then + // Strongbox) was publicly released for the first time. + // https://www.newyorker.com/news/news-desk/strongbox-and-aaron-swartz + SystemTime::UNIX_EPOCH + // Equivalent to 2013-05-14 + .checked_add(Duration::from_secs(1368507600)) + // unwrap: Safe because the value is fixed and we know it won't overflow + .unwrap(), + ) + .add_storage_encryption_subkey() + .set_password(Some(passphrase.into())) + .generate()?; + let public_key = String::from_utf8(cert.armored().to_vec()?)?; + let secret_key = String::from_utf8(cert.as_tsk().armored().to_vec()?)?; + Ok((public_key, secret_key, format!("{}", cert.fingerprint()))) +} + +/// Encrypt a message (text) for the specified recipients. The list of +/// recipients is a set of PGP public keys. The encrypted message will +/// be written to `destination`. +#[pyfunction] +pub fn encrypt_message( + recipients: Vec, + plaintext: String, + destination: PathBuf, +) -> Result<()> { + let plaintext = plaintext.as_bytes(); + encrypt(&recipients, plaintext, &destination) +} + +/// Encrypt a file that's already on disk for the specified recipients. +/// The list of recipients is a set of PGP public keys. The encrypted file +/// will be written to `destination`. +#[pyfunction] +pub fn encrypt_file( + recipients: Vec, + plaintext: PathBuf, + destination: PathBuf, +) -> Result<()> { + let plaintext = File::open(plaintext)?; + encrypt(&recipients, plaintext, &destination) +} + +/// Helper function to encrypt readable things. +fn encrypt( + recipients: &[String], + mut plaintext: impl Read, + destination: &Path, +) -> Result<()> { + let p = &StandardPolicy::new(); + let mut certs = vec![]; + let mut recipient_keys = vec![]; + for recipient in recipients { + certs.push(Cert::from_str(recipient)?); + } + for cert in certs.iter() { + for key in cert + .keys() + .with_policy(p, None) + .supported() + .alive() + .revoked(false) + { + recipient_keys.push(key); + } + } + + let mut sink = File::create(destination)?; + let message = Message::new(&mut sink); + let message = Armorer::new(message).build()?; + let message = Encryptor::for_recipients(message, recipient_keys).build()?; + let mut message = LiteralWriter::new(message).build()?; + + io::copy(&mut plaintext, &mut message)?; + + message.finalize()?; + + Ok(()) +} + +/// Decrypt the given ciphertext using the specified private key that is locked +/// using the provided passphrase. It is assumed that the plaintext is UTF-8. +#[pyfunction] +pub fn decrypt( + ciphertext: Bytes, + secret_key: String, + passphrase: String, +) -> Result { + let recipient = Cert::from_str(&secret_key)?; + let policy = &StandardPolicy::new(); + let passphrase: Password = passphrase.into(); + let helper = decryption::Helper { + policy, + secret: &recipient, + passphrase: &passphrase, + }; + + // Now, create a decryptor with a helper using the given Certs. + let mut decryptor = DecryptorBuilder::from_bytes(&ciphertext)? + .with_policy(policy, None, helper)?; + + // Decrypt the data. + let mut buffer: Bytes = vec![]; + io::copy(&mut decryptor, &mut buffer)?; + let plaintext = String::from_utf8(buffer)?; + Ok(plaintext) +} + +#[cfg(test)] +mod tests { + use super::*; + use tempfile::NamedTempFile; + + #[test] + fn test_generate_source_key_pair() { + let (public_key, secret_key, fingerprint) = generate_source_key_pair( + "correcthorsebatterystaple", + "foo@example.org", + ) + .unwrap(); + assert_eq!(fingerprint.len(), 40); + println!("{}", public_key); + assert!(public_key.starts_with("-----BEGIN PGP PUBLIC KEY BLOCK-----")); + assert!(public_key.contains("Comment: Source Key ")); + let cert = Cert::from_str(&public_key).unwrap(); + assert_eq!(format!("{}", cert.fingerprint()), fingerprint); + println!("{}", secret_key); + assert!(secret_key.starts_with("-----BEGIN PGP PRIVATE KEY BLOCK-----")); + assert!(secret_key.contains("Comment: Source Key ")); + let cert = Cert::from_str(&secret_key).unwrap(); + assert_eq!(format!("{}", cert.fingerprint()), fingerprint); + } + + #[test] + fn test_encryption_decryption() { + // Generate a new key + let (public_key, secret_key, _fingerprint) = generate_source_key_pair( + "correcthorsebatterystaple", + "foo@example.org", + ) + .unwrap(); + let tmp = NamedTempFile::new().unwrap(); + // Encrypt a message + encrypt_message( + vec![public_key], + "Rust is great 🦀".to_string(), + tmp.path().to_path_buf(), + ) + .unwrap(); + let ciphertext = std::fs::read_to_string(tmp.path()).unwrap(); + // Verify ciphertext looks like an encrypted message + assert!(ciphertext.starts_with("-----BEGIN PGP MESSAGE-----\n")); + // Try to decrypt the message + let plaintext = decrypt( + ciphertext.into_bytes(), + secret_key, + "correcthorsebatterystaple".to_string(), + ) + .unwrap(); + // Verify message is what we put in originally + assert_eq!("Rust is great 🦀", &plaintext); + } +} diff --git a/rust-toolchain.toml b/rust-toolchain.toml new file mode 100644 index 00000000000..f2415f8315c --- /dev/null +++ b/rust-toolchain.toml @@ -0,0 +1,2 @@ +[toolchain] +channel = "1.69.0" diff --git a/rustfmt.toml b/rustfmt.toml new file mode 100644 index 00000000000..df99c69198f --- /dev/null +++ b/rustfmt.toml @@ -0,0 +1 @@ +max_width = 80