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//! An implementation of RPM's OpenPGP interface.
//!
//! This library provides an implementation of [RPM's OpenPGP
//! interface](https://github.com/rpm-software-management/rpm/blob/master/include/rpm/rpmpgp.h).
//!
//! **You should not link to this library directly**.
//!
//! If you are looking for an OpenPGP interface, consider using
//! [Sequoia], which this library is based on. If you want to use
//! RPM's OpenPGP interface, which you should only do if you are
//! interacting with RPM, then you should link against [RPM], which
//! reexports this interface.
//!
//! [Sequoia]: https://gitlab.com/sequoia-pgp/sequoia
//! [RPM]: http://rpm.org
//!
//! If you are investigating a bug in this library, set the
//! `RPM_TRACE` environment variable to 1 to get a verbose trace of
//! the library's execution:
//!
//! ```sh
//! $ LD_LIBRARY_PATH=/tmp/rpm-sequoia/release RPM_TRACE=1 ./rpmkeys \
//! --import ../tests/data/keys/CVE-2021-3521-badbind.asc
//! _rpmInitCrypto: entered
//! _rpmInitCrypto: -> success
//! _pgpParsePkts: entered
//! ...
//! ```
//!
//! # Policy
//!
//! When Sequoia evaluates the validity of an object (e.g., a
//! cryptographic signature) it consults a policy. The policy is user
//! defined. This library uses [Sequoia's standard policy].
//!
//! [Sequoia's standard policy]: https://docs.sequoia-pgp.org/sequoia_openpgp/policy/struct.StandardPolicy.html
//!
//! Sequoia's standard policy allows self-signatures (i.e., the
//! signatures that bind a User ID or subkey to a certificate) made
//! with SHA-1 until February 2023. It completely disallows data
//! signatures made with SHA-1. The reason for this is that SHA-1
//! collision resistance is broken, but its second pre-image
//! resistance is still okay.
//!
//! As an added protection, Sequoia uses [SHA-1 collision detection],
//! which is a variant of SHA-1, which mitigates known attacks against
//! SHA-1. SHA-1 CD has a very low [false positive rate] (2^-90) so
//! it can be treated as a drop-in, fully compatible replacement for
//! SHA-1.
//!
//! [SHA-1 collision detection]: https://github.com/cr-marcstevens/sha1collisiondetection
//! [false positive rate]: https://github.com/cr-marcstevens/sha1collisiondetection#about
//!
//! # Configuration File
//!
//! This library reads the [crypto policy configuration] in
//! `/etc/crypto-policies/back-ends/sequoia.config`. This can be
//! overridden using the `SEQUOIA_CRYPTO_POLICY` environment variable.
//! If set to the empty string, then no crypto policy will be read and
//! instead [Sequoia's default policy] will be used.
//!
//! Refer to the [Fedora Crypto Policy] project for information about
//! the crypto policy.
//!
//! [crypto policy configuration]: https://docs.rs/sequoia-policy-config/latest/sequoia_policy_config/
//! [Sequoia's default policy]: https://docs.sequoia-pgp.org/sequoia_openpgp/policy/struct.StandardPolicy.html
//! [Fedora Crypto Policy]: https://gitlab.com/redhat-crypto/fedora-crypto-policies/
use std::env;
use std::ffi::{
CString,
};
use std::fmt::Debug;
use std::io::Read;
use std::io::Write;
use std::sync::RwLock;
use std::time::{
Duration,
SystemTime,
UNIX_EPOCH,
};
#[allow(unused_imports)]
use anyhow::Context;
use libc::{
c_char,
c_int,
c_uint,
c_void,
size_t,
};
use chrono::{
DateTime,
NaiveDateTime,
TimeZone,
Utc,
};
use sequoia_openpgp as openpgp;
use openpgp::armor;
use openpgp::Cert;
use openpgp::cert::prelude::*;
use openpgp::Fingerprint;
use openpgp::packet::key::{
PublicParts,
};
use openpgp::packet::{
Packet,
Signature,
Tag,
};
use openpgp::parse::{
PacketParser,
PacketParserResult,
PacketParserBuilder,
Dearmor,
};
use openpgp::parse::Parse;
use openpgp::policy::{
NullPolicy,
StandardPolicy,
Policy,
};
use openpgp::types::RevocationStatus;
#[macro_use] mod log;
#[macro_use] mod ffi;
#[macro_use] pub mod rpm;
use rpm::{
Error,
ErrorCode,
PgpArmor,
PgpArmorError,
Result,
};
pub mod digest;
lazy_static::lazy_static! {
static ref P: RwLock<StandardPolicy<'static>> = RwLock::new(StandardPolicy::new());
}
const NP: &NullPolicy = &NullPolicy::new();
// Set according to the RPM_TRACE environment variable (enabled if
// non-zero), or if we are built in debug mode.
lazy_static::lazy_static! {
static ref TRACE: bool = {
if let Ok(v) = env::var("RPM_TRACE") {
let v: isize = v.parse().unwrap_or(1);
v != 0
} else {
false
}
};
}
/// Prints the error and causes, if any.
pub fn print_error_chain(err: &anyhow::Error) {
eprintln!(" {}", err);
err.chain().skip(1).for_each(|cause| eprintln!(" because: {}", cause));
}
// Sometimes the same error cascades, e.g.:
//
// ```
// $ sq-wot --time 20230110T0406 --keyring sha1.pgp path B5FA089BA76FE3E17DC11660960E53286738F94C 231BC4AB9D8CAB86D1622CE02C0CE554998EECDB FABA8485B2D4D5BF1582AA963A8115E774FA9852 "<carol@example.org>"
// [ ] FABA8485B2D4D5BF1582AA963A8115E774FA9852 <carol@example.org>: not authenticated (0%)
// ◯ B5FA089BA76FE3E17DC11660960E53286738F94C ("<alice@example.org>")
// │ No adequate certification found.
// │ No binding signature at time 2023-01-10T04:06:00Z
// │ No binding signature at time 2023-01-10T04:06:00Z
// │ No binding signature at time 2023-01-10T04:06:00Z
// ...
// ```
//
// Although technically correct, it's just noise. Compress them.
fn error_chain(err: &anyhow::Error) -> Vec<String> {
let mut errs = std::iter::once(err.to_string())
.chain(err.chain().map(|source| source.to_string()))
.collect::<Vec<String>>();
errs.dedup();
errs
}
// Generate macros for working with lints.
//
// Note: $dollar is a hack, which we use because nested macros with
// repetitions don't currently work. See:
// https://github.com/rust-lang/rust/pull/95860
macro_rules! linter {
($dollar:tt, $lints:ident) => {
// A helper macro to add a lint.
//
// If `$err` is `None`, `$msg` is turned into an `anyhow::Error` and
// appended to `lints`.
//
// If `$err` is `Some`, `$msg` is added as context to `$err` and is
// then appended to `lints`.
macro_rules! add_lint {
($err:expr, $msg:expr $dollar(, $args:expr)*) => {{
let err: Option<anyhow::Error> = $err;
let msg = format!("{}", format_args!($msg $dollar(, $args)*));
let err = if let Some(err) = err {
err.context(msg)
} else {
anyhow::anyhow!(msg)
};
$lints.push(err);
}};
}
// A helper to return an error.
//
// This adds a lint using `lint!` and then returns
// `Error::Fail($msg)`.
macro_rules! return_err {
($err:expr, $msg:expr $dollar(, $args:expr)*) => {{
add_lint!($err, $msg $dollar(, $args)*);
return Err(Error::Fail(
format!("{}", format_args!($msg $dollar(, $args)*))));
}};
}
}
}
// By default we prefer this environment variable and this file, but
// if that is not present, we fallback to the default configuration.
const RPM_SEQUOIA_CONFIG_ENV: &'static str
= "RPM_SEQUOIA_CRYPTO_POLICY";
const RPM_SEQUOIA_CONFIG: &'static str
= "/etc/crypto-policies/back-ends/rpm-sequoia.config";
ffi!(
/// int rpmInitCrypto(void)
fn _rpmInitCrypto() -> Binary {
// XXX: Remove this once v4 signatures are ubiquitous.
//
// Unfortunately, much of the rpm ecosystem is still (2022)
// generating v3 signatures. As they aren't completely broken,
// accept them by default, but still let them be overridden by the
// system policy.
//
// See https://bugzilla.redhat.com/show_bug.cgi?id=2141686
let mut p = openpgp::policy::StandardPolicy::new();
p.accept_packet_tag_version(openpgp::packet::Tag::Signature, 3);
let mut p = sequoia_policy_config::ConfiguredStandardPolicy
::from_policy(p);
match p.parse_config(RPM_SEQUOIA_CONFIG_ENV,
RPM_SEQUOIA_CONFIG)
{
Ok(false) => {
// Fallback to the default configuration.
if let Err(err) = p.parse_default_config() {
print_error_chain(&err);
return Err(err.into());
}
}
Ok(true) => (),
Err(err) => {
print_error_chain(&err);
return Err(err.into());
}
}
*crate::P.write().unwrap() = p.build();
Ok(())
});
ffi!(
/// int rpmFreeCrypto(void)
fn _rpmFreeCrypto() -> Binary {
Ok(())
});
// These are still implemented in C due to internationalization, and
// to avoid translating the string tables, which is a fair amount of
// error prone work, and doesn't improve safety.
//
// stub!(pgpValString);
// stub!(pgpIdentItem);
// This is implemented in C: it is just a wrapper around pgpParsePkts,
// which uses some internal rpm functions.
//
// stub!(pgpReadPkts);
/// An OpenPGP object.
///
/// This data structure can hold either a signature, a certificate, or
/// a subkey.
enum PgpDigParamsObj {
Cert(Cert),
Subkey(Cert, Fingerprint),
Signature(Signature),
}
pub struct PgpDigParams {
obj: PgpDigParamsObj,
signid: [u8; 8],
userid: Option<CString>,
}
impl PgpDigParams {
fn cert(&self) -> Option<&Cert> {
match &self.obj {
PgpDigParamsObj::Cert(cert) => Some(cert),
PgpDigParamsObj::Subkey(cert, _) => Some(cert),
PgpDigParamsObj::Signature(_) => None,
}
}
fn key(&self) -> Option<ErasedKeyAmalgamation<PublicParts>> {
match &self.obj {
PgpDigParamsObj::Cert(cert) => {
Some(cert.primary_key().into())
}
PgpDigParamsObj::Subkey(cert, fpr) => {
Some(cert.keys().subkeys()
.key_handle(fpr)
.next()
.expect("subkey missing")
.into())
}
PgpDigParamsObj::Signature(_) => None,
}
}
fn signature(&self) -> Option<&Signature> {
match &self.obj {
PgpDigParamsObj::Cert(_) => None,
PgpDigParamsObj::Subkey(_, _) => None,
PgpDigParamsObj::Signature(sig) => Some(sig),
}
}
}
ffi!(
/// Returns the signature's type.
///
/// If `dig` is NULL or does not contain a signature, then this
/// function returns -1.
fn _pgpSignatureType(dig: *const PgpDigParams) -> c_int[-1] {
let dig = check_ptr!(dig);
dig.signature()
.ok_or_else(|| Error::Fail("Not a signature".into()))
.map(|sig| {
u8::from(sig.typ()).into()
})
});
ffi!(
/// Frees the parameters.
fn _pgpDigParamsFree(dig: Option<&mut PgpDigParams>) {
free!(dig);
});
ffi!(
/// "Compares" the two parameters and returns 1 if they differ and 0 if
/// they match.
///
/// Two signatures are considered the same if they have the same
/// parameters (version, signature type, public key and hash
/// algorithms, and the first issuer packet). Note: this function
/// explicitly does not check that the MPIs are the same, nor that the
/// signature creation time is the same! This is intended. The only
/// use of this function in the rpm code base is to check whether a key
/// has already made a signature (cf. sign/rpmgensig.c:haveSignature).
///
/// Two certificates are considered the same if they have the same
/// fingerprint. (rpm does not currently use this functionality.)
///
/// Two subkeys are considered the same if they have the same
/// fingerprint. (rpm does not currently use this functionality.)
fn _pgpDigParamsCmp(p1: *const PgpDigParams,
p2: *const PgpDigParams)
-> c_int[1]
{
let p1 = check_ptr!(p1);
let p2 = check_ptr!(p2);
let r = match (&p1.obj, &p2.obj) {
(PgpDigParamsObj::Cert(c1), PgpDigParamsObj::Cert(c2)) => {
c1.fingerprint() == c2.fingerprint()
}
(PgpDigParamsObj::Subkey(_, f1), PgpDigParamsObj::Subkey(_, f2)) => {
f1 == f2
}
(PgpDigParamsObj::Signature(s1), PgpDigParamsObj::Signature(s2)) => {
t!("s1: {:?}", s1);
t!("s2: {:?}", s2);
s1.hash_algo() == s2.hash_algo()
&& s1.pk_algo() == s2.pk_algo()
&& s1.version() == s2.version()
&& s1.typ() == s2.typ()
&& p1.signid == p2.signid
}
_ => {
false
}
};
Ok(if r { 0 } else { 1 })
});
const PGPVAL_PUBKEYALGO: c_uint = 6;
const PGPVAL_HASHALGO: c_uint = 9;
ffi!(
/// Returns the object's public key or algorithm algorithm.
///
/// `algotype` is either `PGPVAL_PUBKEYALGO` or `PGPVAL_HASHALGO`.
/// Other algo types are not support and cause this function to return
/// 0.
fn _pgpDigParamsAlgo(dig: *const PgpDigParams,
algotype: c_uint) -> c_uint[0]
{
let dig = check_ptr!(dig);
match (algotype, &dig.obj) {
// pubkey algo.
(PGPVAL_PUBKEYALGO, PgpDigParamsObj::Cert(cert)) => {
Ok(u8::from(cert.primary_key().pk_algo()).into())
}
(PGPVAL_PUBKEYALGO, PgpDigParamsObj::Subkey(_, _)) => {
Ok(u8::from(dig.key().expect("valid").pk_algo()).into())
}
(PGPVAL_PUBKEYALGO, PgpDigParamsObj::Signature(sig)) => {
Ok(u8::from(sig.pk_algo()).into())
}
// hash algo.
(PGPVAL_HASHALGO, PgpDigParamsObj::Cert(cert)) => {
match cert.with_policy(&*P.read().unwrap(), None) {
Ok(vc) => {
let algo = vc.primary_key().binding_signature().hash_algo();
Ok(u8::from(algo).into())
}
Err(err) => {
Err(Error::Fail(
format!("Using {}: {}", cert.fingerprint(), err)))
}
}
}
(PGPVAL_HASHALGO, PgpDigParamsObj::Subkey(_, fpr)) => {
let ka = dig.key().expect("valid");
match ka.with_policy(&*P.read().unwrap(), None) {
Ok(ka) => {
let algo = ka.binding_signature().hash_algo();
Ok(u8::from(algo).into())
}
Err(err) => {
Err(Error::Fail(
format!("Using {}: {}", fpr, err)))
}
}
}
(PGPVAL_HASHALGO, PgpDigParamsObj::Signature(sig)) => {
Ok(u8::from(sig.hash_algo()).into())
}
// Unknown algo.
(t, PgpDigParamsObj::Cert(_))
| (t, PgpDigParamsObj::Subkey(_, _))
| (t, PgpDigParamsObj::Signature(_)) => {
Err(Error::Fail(format!("Invalid algorithm type: {}", t)))
}
}
});
ffi!(
/// Returns the issuer or the Key ID.
///
/// If `dig` is a signature, then this returns the Key ID stored in the
/// first Issuer or Issuer Fingerprint subpacket as a hex string.
/// (This is not authenticated!)
///
/// If `dig` is a certificate or a subkey, then this returns the key's
/// Key ID.
///
/// The caller must *not* free the returned buffer.
fn _pgpDigParamsSignID(dig: *const PgpDigParams) -> *const u8 {
let dig = check_ptr!(dig);
t!("SignID: {}",
dig.signid.iter().map(|v| format!("{:02X}", v)).collect::<String>());
Ok(dig.signid.as_ptr())
});
ffi!(
/// Returns the primary User ID, if any.
///
/// If `dig` is a signature, then this returns `NULL`.
///
/// If `dig` is a certificate or a subkey, then this returns the
/// certificate's primary User ID, if any.
///
/// This interface does not provide a way for the caller to recognize
/// any embedded `NUL` characters.
///
/// The caller must *not* free the returned buffer.
fn _pgpDigParamsUserID(dig: *const PgpDigParams) -> *const c_char {
let dig = check_ptr!(dig);
if let Some(ref userid) = dig.userid {
Ok(userid.as_ptr())
} else {
Ok(std::ptr::null())
}
});
ffi!(
/// Returns the object's version.
///
/// If `dig` is a signature, then this returns the version of the
/// signature packet.
///
/// If `dig` is a certificate, then this returns the version of the
/// primary key packet.
///
/// If `dig` is a subkey, then this returns the version of the subkey's
/// key packet.
fn _pgpDigParamsVersion(dig: *const PgpDigParams) -> c_int[0] {
let dig = check_ptr!(dig);
let version = match &dig.obj {
PgpDigParamsObj::Cert(cert) => {
cert.primary_key().version()
}
PgpDigParamsObj::Subkey(_, _) => {
dig.key().unwrap().version()
}
PgpDigParamsObj::Signature(sig) => {
sig.version()
}
};
Ok(version as c_int)
});
ffi!(
/// Returns the object's time.
///
/// If `dig` is a signature, then this returns the signature's creation
/// time.
///
/// If `dig` is a certificate, then this returns the primary key's key
/// creation time.
///
/// If `dig` is a subkey, then this returns the subkey's key creation
/// time.
fn _pgpDigParamsCreationTime(dig: *const PgpDigParams) -> u32[0] {
let dig = check_ptr!(dig);
let t = match &dig.obj {
PgpDigParamsObj::Cert(cert) => {
cert.primary_key().creation_time()
}
PgpDigParamsObj::Subkey(cert, fpr) => {
cert.keys().subkeys()
.key_handle(fpr)
.next()
.expect("subkey missing")
.creation_time()
}
PgpDigParamsObj::Signature(sig) => {
sig.signature_creation_time().unwrap_or(UNIX_EPOCH)
}
};
Ok(t.duration_since(UNIX_EPOCH)
.map_err(|_| Error::Fail("time".into()))?
.as_secs() as u32)
});
ffi!(
/// Verifies the signature.
///
/// If `key` is `NULL`, then this computes the hash and checks it
/// against the hash prefix.
///
/// If `key` is not `NULL`, then this checks that the signature is
/// correct.
///
/// This function does not modify `ctx`. Instead, it first duplicates
/// `ctx` and then hashes the the meta-data into that context.
///
/// This function fails if the signature is not valid, or a supplied
/// key is not valid.
///
/// A signature is valid if:
///
/// - The signature is alive now (not created in the future, and not
/// yet expired)
///
/// - It is accepted by the [policy].
///
/// A key is valid if as of the *signature's* creation time if:
///
/// - The certificate is valid according to the [policy].
///
/// - The certificate is alive
///
/// - The certificate is not revoke
///
/// - The key is alive
///
/// - The key is not revoke
///
/// - The key has the signing capability set.
///
/// [policy]: index.html#policy
fn _pgpVerifySignature(key: *const PgpDigParams,
sig: *const PgpDigParams,
ctx: *const digest::DigestContext) -> ErrorCode {
match _pgpVerifySignature2(key, sig, ctx, std::ptr::null_mut()) {
0 => Ok(()),
ec => Err(Error::from(ec)),
}
});
ffi!(
/// Like _pgpVerifySignature, but returns error messages and lints in
/// `lint_str`.
fn _pgpVerifySignature2(key: *const PgpDigParams,
sig: *const PgpDigParams,
ctx: *const digest::DigestContext,
lint_str: *mut *mut c_char) -> ErrorCode {
let key: Option<&PgpDigParams> = check_optional_ptr!(key);
let sig: &PgpDigParams = check_ptr!(sig);
// This function MUST NOT free or even change ctx.
let mut ctx = check_ptr!(ctx).clone();
let mut lint_str: Option<&mut _> = check_optional_mut!(lint_str);
if let Some(lint_str) = lint_str.as_mut() {
**lint_str = std::ptr::null_mut();
}
let mut lints = Vec::new();
let r = pgp_verify_signature(key, sig, ctx, &mut lints);
// Return any lint / error messages.
if lints.len() > 0 {
let mut s: String = if let Some(key) = key {
format!(
"Verifying a signature using certificate {} ({}):",
key.cert()
.map(|cert| cert.fingerprint().to_string())
.unwrap_or_else(|| "<invalid certificate>".to_string()),
key.cert()
.and_then(|cert| {
cert.userids().next()
.map(|userid| {
String::from_utf8_lossy(userid.value()).into_owned()
})
})
.unwrap_or_else(|| {
"<unknown>".into()
}))
} else {
format!(
"Verifying a signature, but no certificate was \
provided:")
};
// Indent the lints.
let sep = "\n ";
let lints_count = lints.len();
for (err_i, err) in lints.into_iter().enumerate() {
for (cause_i, cause) in error_chain(&err).into_iter().enumerate() {
if cause_i == 0 {
s.push_str(sep);
if lints_count > 1 {
s.push_str(&format!("{}. ", err_i + 1));
}
} else {
s.push_str(sep);
s.push_str(" because: ");
}
s.push_str(&cause);
}
}
t!("Lints: {}", s);
if let Some(lint_str) = lint_str.as_mut() {
// Add a trailing NUL.
s.push('\0');
**lint_str = s.as_mut_ptr() as *mut c_char;
// Pass ownership to the caller.
std::mem::forget(s);
}
}
r
});
// Verifies the signature.
//
// Lints are appended to `lints`. Note: multiple lints may be added.
fn pgp_verify_signature(key: Option<&PgpDigParams>,
sig: &PgpDigParams,
mut ctx: digest::DigestContext,
lints: &mut Vec<anyhow::Error>)
-> Result<()>
{
tracer!(*crate::TRACE, "pgp_verify_signature");
linter!($, lints);
// Whether the verification relies on legacy cryptography.
let mut legacy = false;
let sig = sig.signature().ok_or_else(|| {
Error::Fail("sig parameter does not designate a signature".into())
})?;
let sig_id = || {
let digest_prefix = sig.digest_prefix();
format!("{:02x}{:02x} created at {}",
digest_prefix[0],
digest_prefix[1],
if let Some(t) = sig.signature_creation_time() {
DateTime::<Utc>::from(t)
.format("%c").to_string()
} else {
"<unknown>".to_string()
})
};
let sig_time = if let Some(t) = sig.signature_creation_time() {
t
} else {
return_err!(
None,
"Signature {} invalid: signature missing a creation time",
sig_id());
};
// Allow some clock skew.
if let Err(err) = sig.signature_alive(None, Duration::new(5 * 60, 0)) {
return_err!(
Some(err),
"Signature {} invalid: signature is not alive",
sig_id());
}
{
let policy = P.read().unwrap();
if let Err(err) = policy.signature(sig, Default::default()) {
if NP.signature(sig, Default::default()).is_ok() {
legacy = true;
add_lint!(
Some(err),
"Signature {} invalid: signature relies on legacy cryptography",
sig_id());
} else {
return_err!(
Some(err),
"Signature {} invalid: policy violation", sig_id());
}
}
// XXX: As of sequoia-openpgp v1.11.0, this check is not done
// by `policy.signature` (see issue #953). We do it manually,
// but once rpm-sequoia depends on a newer version of
// sequoia-openpgp that does this, remove this code.
if let Err(err) = policy.packet(&Packet::from(sig.clone())) {
if NP.packet(&Packet::from(sig.clone())).is_ok() {
legacy = true;
add_lint!(
Some(err),
"Signature {} invalid: signature relies on legacy cryptography",
sig_id());
} else {
return_err!(
Some(err),
"Signature {} invalid: policy violation", sig_id());
}
}
}
// XXX: rpm only cares about the first issuer
// subpacket.
let issuer = match sig.get_issuers().into_iter().next() {
Some(issuer) => issuer,
None => return_err!(
None,
"Signature {} invalid: signature has no issuer subpacket",
sig_id()),
};
if let Some(key) = key {
// Actually verify the signature.
let cert = key.cert().ok_or_else(|| {
Error::Fail("key parameter is not a cert".into())
})?;
let subkey = key.key().expect("is a certificate").fingerprint();
t!("Checking signature {} using {} with {} / {}",
sig_id(), sig.hash_algo(),
cert.fingerprint(), subkey);
// We evaluate the certificate as of the signature creation
// time.
let p = &*P.read().unwrap();
let vc = cert.with_policy(p, sig_time)
.or_else(|err| {
// Try again, but use the current time as a reference
// time. It is quite common for old self-signatures
// to be stripped.
match cert.with_policy(p, None) {
Ok(vc) => {
// We'd really like to emit the following
// lint, but for most users it is not
// actionable. When the ecosystem changes so
// that certificates include older self
// signatures, enable it again.
// add_lint!(
// None,
// "Certificate has no valid binding signature \
// as of the signature's creation time, but \
// is valid now. The certificate has probably \
// been stripped or minimized.");
Ok(vc)
}
Err(err2) => {
add_lint!(
Some(err),
"Certificate {} invalid: policy violation",
cert.keyid());
Err(err2)
}
}
})
.or_else(|err| {
legacy = true;
add_lint!(
Some(err),
"Certificate {} invalid: policy violation",
cert.keyid());
cert.with_policy(NP, sig_time)
})?;
if let Err(err) = vc.alive() {
legacy = true;
add_lint!(
Some(err),
"Certificiate {} invalid: certificate is not alive",
vc.keyid());
}
if let RevocationStatus::Revoked(_) = vc.revocation_status() {
legacy = true;
add_lint!(
None,
"Certificate {} invalid: certificate is revoked",
vc.keyid());
}
// Find the key.
match vc.keys().key_handle(issuer.clone()).next() {
Some(ka) => {
if ka.fingerprint() != subkey {
return_err!(None,
"Key {} invalid: wrong subkey ({})",
ka.keyid(), subkey);
}
if ! ka.for_signing() {
return_err!(None,
"Key {} invalid: not signing capable",
ka.keyid());
}
if let Err(err) = ka.alive() {
legacy = true;
add_lint!(Some(err),
"Key {} invalid: key is not alive",
ka.keyid());
}
if let RevocationStatus::Revoked(_) = ka.revocation_status() {
legacy = true;
add_lint!(None,
"Key {} is invalid: key is revoked",
ka.keyid());
}
// Finally we can verify the signature.
sig.clone().verify_hash(&ka, ctx.ctx.clone())?;
if legacy {
return Err(Error::NotTrusted(
"Verification relies on legacy crypto".into())
.into());
} else {
return Ok(());
}
}
None => {
return_err!(None,
"Certificate {} does not contain key {} \
or it is not valid",
vc.keyid(), issuer);
}
}
} else {
// We don't have a key, but we still check that the prefix is
// correct.
// These traits should be imported only where needed to avoid
// bugs.
use openpgp::serialize::Marshal;
use openpgp::serialize::MarshalInto;
// See https://datatracker.ietf.org/doc/html/rfc4880#section-5.2.4
let mut sig_data = Vec::with_capacity(128);
// Hash the signature into the context.
match sig.version() {
4 => {
sig_data.push(sig.version());
sig_data.push(sig.typ().into());
sig_data.push(sig.pk_algo().into());
sig_data.push(sig.hash_algo().into());
let l = sig.hashed_area().serialized_len() as u16;
sig_data.push((l >> 8) as u8);
sig_data.push((l >> 0) as u8);
sig.hashed_area().serialize(&mut sig_data).expect("vec");
let sig_len = sig_data.len();
// Trailer.
sig_data.push(sig.version());
sig_data.push(0xFF);
sig_data.push((sig_len >> 24) as u8);
sig_data.push((sig_len >> 16) as u8);
sig_data.push((sig_len >> 8) as u8);
sig_data.push((sig_len >> 0) as u8);
}
3 => {
sig_data.push(sig.typ().into());
let ct = sig.signature_creation_time().unwrap_or(UNIX_EPOCH);
let ct = ct.duration_since(UNIX_EPOCH)
.map_err(|_| Error::Fail("time".into()))?
.as_secs() as u32;
sig_data.push((ct >> 24) as u8);
sig_data.push((ct >> 16) as u8);
sig_data.push((ct >> 8) as u8);
sig_data.push((ct >> 0) as u8);
}
v => {
return Err(Error::Fail(
format!("Unsupported signature version: {}", v)));
}
}
ctx.update(&sig_data);
let digest_size = ctx.digest_size();
let mut digest: Vec<u8> = Vec::with_capacity(digest_size);
for _ in 0..digest_size {
digest.push(0);
}
ctx.digest(&mut digest[..])?;
let p = sig.digest_prefix();
if p[0] != digest[0] || p[1] != digest[1] {
return Err(Error::Fail("digest prefix mismatch".into()));
} else {
t!("digest prefix matches");
}
return Err(Error::NoKey(
format!("Not provided (issuer: {})", issuer).into()));
}
}
ffi!(
/// Returns the Key ID of the public key or the secret key stored in
/// `pkt`.
///
/// Returns -1 if `pkt` is not a public key or secret key.
///
/// Note: this function does not handle public subkeys or secret
/// subkeys!
///
/// `keyid` must be allocated by the caller and points to at least 8
/// bytes of memory.
///
/// Returns 0 on success and -1 on failure.
fn _pgpPubkeyKeyID(pkt: *const u8, pktlen: size_t, keyid: *mut u8)
-> Binary
{
let pkt = check_slice!(pkt, pktlen);
let ppr = PacketParser::from_bytes(pkt)?;
let k = if let PacketParserResult::Some(ref pp) = ppr {
match &pp.packet {
Packet::PublicKey(key) => Some(key.keyid()),
Packet::SecretKey(key) => Some(key.keyid()),
_ => None,
}
} else {
None
};
t!("Key ID: {}",
k.as_ref()
.map(|k| k.to_string())
.unwrap_or_else(|| String::from("none")));
if let Some(k) = k {
let buffer = check_mut_slice!(keyid, 8);
buffer.copy_from_slice(k.as_bytes());
Ok(())
} else {
Err(Error::Fail("Not a key".into()))
}
});
ffi!(
/// Calculate OpenPGP public key fingerprint.
///
/// Returns -1 if `pkt` is not a public key or secret key.
///
/// Note: this function does not handle public subkeys or secret
/// subkeys!
///
/// `*fprout` is allocated using `malloc` and must be allocated by the
/// caller.
///
/// Returns 0 on success and -1 on failure.
fn _pgpPubkeyFingerprint(pkt: *const u8, pktlen: size_t,
fprout: *mut *mut u8, fprlen: *mut size_t)
-> Binary
{
let pkt = check_slice!(pkt, pktlen);
let ppr = PacketParserBuilder::from_bytes(pkt)?
.dearmor(Dearmor::Disabled) // Disable dearmoring.
.build()?;
let fpr = if let PacketParserResult::Some(ref pp) = ppr {
match &pp.packet {
Packet::PublicKey(key) => Some(key.fingerprint()),
Packet::SecretKey(key) => Some(key.fingerprint()),
_ => None,
}
} else {
None
};
t!("Fingerprint: {}",
fpr.as_ref()
.map(|fpr| fpr.to_string())
.unwrap_or_else(|| String::from("none")));
if let Some(fpr) = fpr {
let fpr = fpr.as_bytes();
unsafe {
let buffer = libc::malloc(fpr.len());
libc::memcpy(buffer, fpr.as_ptr() as *const c_void, fpr.len());
*fprout = buffer as *mut u8;
*fprlen = fpr.len();
}
Ok(())
} else {
Err(Error::Fail("Not a key".into()))
}
});
ffi!(
/// Wraps the data in ASCII armor.
///
/// `atype` is the armor type.
///
/// The caller must free the returned buffer.
///
/// Returns `NULL` on failure.
fn _pgpArmorWrap(atype: c_int, s: *const c_char, ns: size_t)
-> *mut c_char
{
let atype = armor::Kind::try_from(PgpArmor::from(atype))?;
let s = check_slice!(s, ns);
let mut writer = armor::Writer::new(Vec::new(), atype)
.map_err(|err| Error::Fail(format!("creating armor writer: {}", err)))?;
writer.write(s)
.map_err(|err| Error::Fail(format!("writing armor body: {}", err)))?;
let mut buffer = writer.finalize()
.map_err(|err| Error::Fail(format!("finalizing armor: {}", err)))?;
// Add a trailing NUL.
buffer.push(0);
let ptr = buffer.as_mut_ptr() as *mut c_char;
std::mem::forget(buffer);
Ok(ptr)
});
ffi!(
/// Returns the length of the certificate in bytes.
///
/// `pkts` points to a buffer. Fails if `pkts` does not point to
/// exactly one valid OpenPGP certificate.
///
/// Returns 0 on failure.
fn _pgpPubKeyCertLen(pkts: *const u8, pktslen: size_t,
certlen: *mut size_t) -> Binary
{
use openpgp::packet::Header;
use openpgp::packet::header::PacketLengthType;
use openpgp::packet::header::BodyLength;
use openpgp::packet::header::CTB;
use buffered_reader::BufferedReader;
let pkts = check_slice!(pkts, pktslen);
let certlen = check_mut!(certlen);
// XXX: These functions are more or less copied from
// sequoia/openpgp/src/parse.rs. When sequoia-openpgp makes them
// public, we drop this copy.
fn body_length_parse_new_format<T, C>(bio: &mut T)
-> openpgp::Result<BodyLength>
where T: BufferedReader<C>, C: Debug + Send + Sync
{
let octet1 : u8 = bio.data_consume_hard(1)?[0];
match octet1 {
0..=191 => // One octet.
Ok(BodyLength::Full(octet1 as u32)),
192..=223 => { // Two octets length.
let octet2 = bio.data_consume_hard(1)?[0];
Ok(BodyLength::Full(((octet1 as u32 - 192) << 8)
+ octet2 as u32 + 192))
},
224..=254 => // Partial body length.
Ok(BodyLength::Partial(1 << (octet1 & 0x1F))),
255 => // Five octets.
Ok(BodyLength::Full(bio.read_be_u32()?)),
}
}
/// Decodes an old format body length as described in [Section
/// 4.2.1 of RFC 4880].
///
/// [Section 4.2.1 of RFC 4880]: https://tools.ietf.org/html/rfc4880#section-4.2.1
fn body_length_parse_old_format<T, C>(bio: &mut T,
length_type: PacketLengthType)
-> openpgp::Result<BodyLength>
where T: BufferedReader<C>, C: Debug + Send + Sync
{
match length_type {
PacketLengthType::OneOctet =>
Ok(BodyLength::Full(bio.data_consume_hard(1)?[0] as u32)),
PacketLengthType::TwoOctets =>
Ok(BodyLength::Full(bio.read_be_u16()? as u32)),
PacketLengthType::FourOctets =>
Ok(BodyLength::Full(bio.read_be_u32()? as u32)),
PacketLengthType::Indeterminate =>
Ok(BodyLength::Indeterminate),
}
}
fn parse_header<T, C>(bio: &mut T)
-> openpgp::Result<Header>
where T: BufferedReader<C>, C: Debug + Send + Sync
{
let ctb = CTB::try_from(bio.data_consume_hard(1)?[0])?;
let length = match ctb {
CTB::New(_) => body_length_parse_new_format(bio)?,
CTB::Old(ref ctb) =>
body_length_parse_old_format(bio, ctb.length_type())?,
};
return Ok(Header::new(ctb, length));
}
let mut br = buffered_reader::Memory::new(pkts);
let mut found_cert = false;
let len: Option<usize> = loop {
// The start of this packet as a byte offset into buffer.
let start_of_packet = br.total_out();
if start_of_packet == pkts.len() {
// We're done.
break Some(start_of_packet);
}
let header = match parse_header(&mut br) {
Ok(header) => header,
Err(err) => {
t!("Error reading certificate at offset {}: {}",
start_of_packet, err);
break None;
}
};
use Tag::*;
let t = header.ctb().tag();
t!("Found a {:?} at offset {}, length: {:?}",
t, start_of_packet, header.length());
match t {
// Start of a new certificate.
PublicKey | SecretKey => {
if found_cert {
break Some(start_of_packet);
} else {
found_cert = true;
}
}
// The body of a certificate.
PublicSubkey
| SecretSubkey
| UserID
| UserAttribute
| Signature
| Marker
| Trust
| Unknown(_)
| Private(_) => {
if start_of_packet == 0 {
t!("Encountered a ({:?}) at offset {}, \
which is not a valid start of a certificate",
t, start_of_packet);
break None;
}
}
Reserved
| PKESK
| SKESK
| OnePassSig
| CompressedData
| SED
| Literal
| SEIP
| MDC
| AED =>
{
t!("Encountered a ({:?}) at offset {}, \
which does not belong in a certificate",
t, start_of_packet);
break None;
}
}
// Advance to the next packet.
match header.length() {
BodyLength::Full(l) => {
let l = *l as usize;
if let Err(err) = br.data_consume_hard(l) {
t!("Error while reading packet: {}", err);
break None;
}
}
BodyLength::Partial(_) => {
t!("Packet {} has partial body length, \
which is unsupported by keyring splitter",
t);
break None;
}
BodyLength::Indeterminate => {
t!("Packet {} has intedeterminite length, \
which is unsupported by keyring splitter",
t);
break None;
}
}
};
if let Some(len) = len {
*certlen = len;
Ok(())
} else {
Err(Error::Fail("No certificate found".into()))
}
});
ffi!(
/// Parses OpenPGP data.
///
/// If `pkts` contains a signature and `pkttype` is 0 or
/// `Tag::Signature`, this returns a `PgpDigParams` containing a
/// signature.
///
/// If `pkts` contains a certificate and `pkttype` is 0,
/// `Tag::PublicKey`, or `Tag::SecretKey`, this returns a
/// `PgpDigParams` containing a certificate. The certificate is
/// checked for validity in the sense that it only contains packets
/// that belong to a certificate; this function does **not** check the
/// binding signatures, etc. That check is done when the key is used
/// in [_pgpVerifySignature].
///
/// Returns 0 on success, -1 on failure.
fn _pgpPrtParams(pkts: *const u8, pktlen: size_t,
pkttype: c_uint, paramsp: *mut *mut PgpDigParams)
-> Binary
{
match _pgpPrtParams2(pkts, pktlen, pkttype, paramsp, std::ptr::null_mut()) {
0 => Ok(()),
ec => Err(Error::from(ec)),
}
});
ffi!(
/// Like _pgpPrtParams, but returns error messages and lints in
/// `lint_str`.
fn _pgpPrtParams2(pkts: *const u8, pktlen: size_t,
pkttype: c_uint, paramsp: *mut *mut PgpDigParams,
lint_str: *mut *mut c_char)
-> Binary
{
let mut lint_str: Option<&mut _> = check_optional_mut!(lint_str);
if let Some(lint_str) = lint_str.as_mut() {
**lint_str = std::ptr::null_mut();
}
let mut lints = Vec::new();
let r = pgp_prt_params(pkts, pktlen, pkttype, paramsp, &mut lints);
// Return any lint / error messages.
if lints.len() > 0 {
let mut s: String = format!("Parsing an OpenPGP packet:");
// Indent the lints.
let sep = "\n ";
let lints_count = lints.len();
for (err_i, err) in lints.into_iter().enumerate() {
for (cause_i, cause) in error_chain(&err).into_iter().enumerate() {
if cause_i == 0 {
s.push_str(sep);
if lints_count > 1 {
s.push_str(&format!("{}. ", err_i + 1));
}
} else {
s.push_str(sep);
s.push_str(" because: ");
}
s.push_str(&cause);
}
}
t!("Lints: {}", s);
if let Some(lint_str) = lint_str.as_mut() {
// Add a trailing NUL.
s.push('\0');
**lint_str = s.as_mut_ptr() as *mut c_char;
// Pass ownership to the caller.
std::mem::forget(s);
}
}
r
});
fn pgp_prt_params(pkts: *const u8, pktlen: size_t,
pkttype: c_uint, paramsp: *mut *mut PgpDigParams,
lints: &mut Vec<anyhow::Error>)
-> Result<()>
{
tracer!(*crate::TRACE, "pgp_prt_params");
linter!($, lints);
let pkttype: Option<Tag> = if pkttype == 0 {
None
} else {
Some(Tag::from(pkttype as u8))
};
let pkts = check_slice!(pkts, pktlen);
let paramsp = check_mut!(paramsp);
*paramsp = std::ptr::null_mut();
let ppr = PacketParser::from_bytes(pkts)?;
let (obj, issuer, userid) = if let PacketParserResult::Some(pp) = ppr {
// Process the packet.
match pp.packet {
Packet::Signature(_)
if pkttype.is_none() || pkttype == Some(Tag::Signature) =>
{
let (packet, next_ppr) = pp.next()?;
if let PacketParserResult::Some(p) = next_ppr {
return_err!(None,
"Expected a bare OpenPGP signature, \
but it's followed by a {}",
p.packet.tag());
}
let sig = if let Packet::Signature(sig) = packet {
sig
} else {
panic!("it's a sig");
};
(PgpDigParamsObj::Signature(sig.clone()),
// XXX: Although there is normally only one issuer
// subpacket, there may be multiple such subpackets.
// Unfortunately, the API only allows us to return
// one.
sig.get_issuers().into_iter().next()
.map(|i| i.as_bytes().to_vec()),
None)
}
Packet::PublicKey(_) | Packet::SecretKey(_)
if pkttype.is_none()
|| pkttype == Some(Tag::PublicKey)
|| pkttype == Some(Tag::SecretKey) =>
{
let cert = match CertParser::from(PacketParserResult::Some(pp)).next()
{
Some(Ok(cert)) => cert,
Some(Err(err)) => return_err!(
Some(err),
"Failed to read an OpenPGP certificate"),
None => return_err!(
None,
"Failed to read an OpenPGP certificate"),
};
let keyid = cert.keyid().as_bytes().to_vec();
let userid = if let Ok(vc)
= cert.with_policy(&*P.read().unwrap(), None)
{
vc.primary_userid()
.ok()
.and_then(|u| {
CString::new(u.value()).ok()
})
} else {
None
};
(PgpDigParamsObj::Cert(cert),
Some(keyid),
userid)
}
Packet::Unknown(mut u) => {
let mut err = u.set_error(anyhow::anyhow!("Error"));
if let Some(openpgp::Error::MalformedMPI(_))
= err.downcast_ref::<openpgp::Error>()
{
err = err.context("\
Signature appears to be created by a \
non-conformant OpenPGP implementation, see \
<https://github.com/rpm-software-management/rpm/issues/2351>.");
}
return_err!(Some(err), "Failed to parse {}", u.tag());
}
ref p => {
return_err!(
None,
"Unexpected OpenPGP packet in this context {}",
p.tag());
}
}
} else {
return_err!(
None,
"Expected an OpenPGP packet, encountered the end of the file");
};
let mut buffer: [u8; 8] = [0; 8];
if let Some(issuer) = issuer {
let issuer = if issuer.len() > buffer.len() {
// We've got a fingerprint. For v4 keys, the last 16
// bytes is the key id.
&issuer[issuer.len() - buffer.len()..]
} else {
&issuer[..]
};
for (i, c) in issuer.into_iter().enumerate() {
buffer[i] = *c as u8;
}
}
*paramsp = move_to_c!(PgpDigParams {
obj,
signid: buffer,
userid: userid,
});
Ok(())
}
ffi!(
/// Returns a `PgpDigParams` data structure for each subkey.
///
/// This does not return a `PgpDigParams` for the primary (just use
/// this one). The subkeys are **not** checked for validity. That
/// check is done when the key is used in [_pgpVerifySignature].
fn _pgpPrtParamsSubkeys(pkts: *const u8, pktlen: size_t,
_mainkey: *const PgpDigParams,
subkeys: *mut *mut PgpDigParams,
subkeys_count: *mut c_int) -> Binary {
let pkts = check_slice!(pkts, pktlen);
let subkeys = check_mut!(subkeys);
*subkeys = std::ptr::null_mut();
let subkeys_count = check_mut!(subkeys_count);
let ppr = PacketParser::from_bytes(pkts)?;
let cert = match ppr {
PacketParserResult::Some(ref pp) => {
match pp.packet {
Packet::PublicKey(_) | Packet::SecretKey(_) => {
let cert = CertParser::from(ppr)
.next()
.ok_or(Error::Fail("Not an OpenPGP certificate".into()))??;
cert
}
ref p => {
return Err(Error::Fail(format!("{}", p.tag())));
}
}
}
_ => return Err(Error::Fail("Not an OpenPGP message".into())),
};
let userid = if let Ok(vc) = cert.with_policy(&*P.read().unwrap(), None) {
vc.primary_userid()
.ok()
.and_then(|u| {
CString::new(u.value()).ok()
})
} else {
None
};
// We return all subkeys here. Subkeys are checked for validity
// on demand.
let mut keys: Vec<*mut PgpDigParams> = cert
.keys().subkeys()
.map(|ka| {
t!("Subkey: {}", ka.keyid());
let zeros = [0; 8];
let mut dig = PgpDigParams {
obj: PgpDigParamsObj::Subkey(cert.clone(), ka.fingerprint()),
signid: zeros,
userid: userid.clone(),
};
dig.signid.copy_from_slice(ka.keyid().as_bytes());
move_to_c!(dig)
})
.collect();
t!("Got {} subkeys", keys.len());
*subkeys_count = keys.len() as c_int;
if keys.len() == 0 {
*subkeys = std::ptr::null_mut();
} else {
*subkeys = keys.as_mut_ptr() as *mut PgpDigParams;
// Pass ownership to the caller.
std::mem::forget(keys);
}
Ok(())
});
ffi!(
/// Strips the ASCII armor and returns the decoded data in `pkt`.
///
/// Despite its name, this function does not actually parse any OpenPGP
/// packets; it just strips the ASCII armor encoding.
///
/// Returns the type of armor on success (>0) or an error code
/// indicating the type of failure (<0).
fn _pgpParsePkts(armor: *const c_char,
pkt: *mut *mut c_char, pktlen: *mut size_t)
-> PgpArmor
{
let armor = check_cstr!(armor);
let pkt = check_mut!(pkt);
*pkt = std::ptr::null_mut();
let pktlen = check_mut!(pktlen);
let mut reader = armor::Reader::from_reader(
std::io::BufReader::new(
armor.to_str().map_err(|_| PgpArmorError::BodyDecode)?.as_bytes()),
armor::ReaderMode::Tolerant(None));
let mut buf = Vec::new();
reader.read_to_end(&mut buf).map_err(|_| PgpArmorError::BodyDecode)?;
let kind = reader.kind();
*pktlen = buf.len() as size_t;
*pkt = buf.as_mut_ptr() as *mut c_char;
// Pass ownership to the caller.
std::mem::forget(buf);
Ok(kind.into())
});
ffi!(
/// Lints the first certificate in pkts.
///
/// This function links the certificate according to the current
/// [policy]. It warns about things like unusable subkeys, because they
/// do not have a valid binding signature. It will also generate a
/// warning if there are no valid, signing-capable keys.
///
/// There are four cases:
///
/// - The packets do not describe a certificate: returns an error and
/// sets `*explanation` to `NULL`.
///
/// - The packets describe a certificate and the certificate is
/// completely unusable: returns an error and sets `*explanation` to
/// a human readable explanation.
///
/// - The packets describe a certificate and some components are not
/// usable: returns success, and sets `*explanation` to a human
/// readable explanation.
///
/// - The packets describe a certificate and there are no lints:
/// returns success, and sets `*explanation` to `NULL`.
///
/// [policy]: index.html#policy
fn _pgpPubKeyLint(pkts: *const c_char,
pktslen: size_t,
explanation: *mut *mut c_char) -> ErrorCode
{
let pkts = check_slice!(pkts, pktslen);
let explanation = check_mut!(explanation);
// Make sure we always set explanation to something.
*explanation = std::ptr::null_mut();
let cert = CertParser::from_bytes(pkts)?.next()
.ok_or(Error::Fail("Not an OpenPGP certificate".into()))??;
let mut lints: Vec<String> = Vec::new();
let mut lint = |l: &str| {
lints.push(l.into());
};
let usable = 'done : loop {
match cert.with_policy(&*P.read().unwrap(), None) {
Err(err) => {
lint(&format!("Policy rejects {}: {}", cert.keyid(), err));
break 'done false;
}
Ok(vc) => {
if let RevocationStatus::Revoked(revs)
= vc.revocation_status()
{
for rev in revs {
if let Some((reason, msg))
= rev.reason_for_revocation()
{
let mut l = format!(
"The certificate was revoked: {}", reason);
if ! msg.is_empty() {
l.push_str(&format!(
", {}",
String::from_utf8_lossy(msg)));
}
lint(&l);
} else {
lint("The certificate was revoked: \
unspecified reason");
}
}
}
if let Err(err) = vc.alive() {
if let Some(e) = vc.primary_key().key_expiration_time() {
if e <= SystemTime::now() {
lint(&format!("The certificate is expired: {}",
err));
} else {
lint(&format!("The certificate is not live: {}",
err));
}
}
}
}
};
let mut have_signing = false;
for ka in cert.keys() {
let keyid = ka.keyid();
match ka.with_policy(&*P.read().unwrap(), None) {
Err(err) => {
lint(&format!("Policy rejects subkey {}: {}",
keyid, err));
continue;
}
Ok(ka) => {
if ! ka.for_signing() {
// Silently ignore non-signing capable
// subkeys. We don't care about them.
continue;
}
if let RevocationStatus::Revoked(revs)
= ka.revocation_status()
{
for rev in revs {
if let Some((reason, msg))
= rev.reason_for_revocation()
{
let mut l = format!(
"Subkey {} was revoked: {}",
keyid, reason);
if ! msg.is_empty() {
l.push_str(&format!(
", {}",
String::from_utf8_lossy(msg)));
}
lint(&l);
} else {
lint(&format!(
"Subkey {} was revoked: \
unspecified reason",
keyid));
}
}
continue;
}
if let Err(err) = ka.alive() {
if let Some(e) = ka.key_expiration_time() {
if e <= SystemTime::now() {
lint(&format!("Subkey {} is expired: {}",
keyid, err));
} else {
lint(&format!("Subkey {} is not live: {}",
keyid, err));
}
}
continue;
}
if ! ka.pk_algo().is_supported() {
lint(&format!("Subkey {} is not supported \
(no support for {})",
keyid,
ka.pk_algo()));
continue;
}
have_signing = true;
}
}
}
if ! have_signing {
lint("Certificate does not have any usable signing keys");
}
break true;
};
if ! lints.is_empty() {
// Indent the lints.
let sep = "\n ";
let mut s: String = format!("Certificate {}:{}", cert.keyid(), sep);
s.push_str(&lints.join(sep));
s.push('\0');
*explanation = s.as_mut_ptr() as *mut c_char;
// Pass ownership to the caller.
std::mem::forget(s);
}
if usable {
Ok(())
} else {
Err(Error::Fail(format!("Certificate {} is unusable", cert.keyid())))
}
});
/// An optional OpenPGP certificate *and* an optional signature.
///
/// This data structure is deprecated and is scheduled for removal in
/// rpm 4.19.
pub struct PgpDig {
cert: Option<Box<PgpDigParams>>,
sig: Option<Box<PgpDigParams>>,
}
/// Dump the packets to stderr.
///
/// This is used by _pgpPrtPkts, which is deprecated and is scheduled
/// for removal in rpm 4.19. It is intended to be bug compatible with
/// rpm's internal implementation.
fn dump_packets(pkts: &[u8]) -> Result<()> {
use openpgp::types::CompressionAlgorithm;
use openpgp::types::KeyServerPreferences;
use openpgp::types::PublicKeyAlgorithm;
use openpgp::types::SignatureType;
use openpgp::types::SymmetricAlgorithm;
use openpgp::packet::signature::subpacket::Subpacket;
use openpgp::packet::signature::subpacket::SubpacketTag;
use openpgp::packet::signature::subpacket::SubpacketValue;
let mut ppr = PacketParser::from_bytes(pkts)?;
fn pk_algo(a: PublicKeyAlgorithm) -> &'static str {
use PublicKeyAlgorithm::*;
#[allow(deprecated)]
match a {
RSAEncryptSign => "RSA",
RSAEncrypt => "RSA(Encrypt-Only)",
RSASign => "RSA(Sign-Only)",
ElGamalEncrypt => "Elgamal(Encrypt-Only)",
DSA => "DSA",
ECDH => "Elliptic Curve",
ECDSA => "ECDSA",
ElGamalEncryptSign => "Elgamal",
EdDSA => "EdDSA",
_ => "Unknown public key algorithm",
}
}
fn sigtype(t: SignatureType) -> &'static str {
use SignatureType::*;
match t {
Binary => "Binary document signature",
Text => "Text document signature",
Standalone => "Standalone signature",
GenericCertification => "Generic certification of a User ID and Public Key",
PersonaCertification => "Persona certification of a User ID and Public Key",
CasualCertification => "Casual certification of a User ID and Public Key",
PositiveCertification => "Positive certification of a User ID and Public Key",
SubkeyBinding => "Subkey Binding Signature",
PrimaryKeyBinding => "Primary Key Binding Signature",
DirectKey => "Signature directly on a key",
KeyRevocation => "Key revocation signature",
SubkeyRevocation => "Subkey revocation signature",
CertificationRevocation => "Certification revocation signature",
Timestamp => "Timestamp signature",
_ => "Unknown signature type",
}
}
fn symalgo(a: SymmetricAlgorithm) -> &'static str {
use SymmetricAlgorithm::*;
match a {
Unencrypted => "Plaintext",
IDEA => "IDEA",
TripleDES => "3DES",
CAST5 => "CAST5",
Blowfish => "BLOWFISH",
AES128 => "AES(128-bit key)",
AES192 => "AES(192-bit key)",
AES256 => "AES(256-bit key)",
Twofish => "TWOFISH(256-bit key)",
_ => "Unknown symmetric key algorithm",
}
}
fn compalgo(a: CompressionAlgorithm) -> &'static str {
use CompressionAlgorithm::*;
match a {
Uncompressed => "Uncompressed",
Zip => "ZIP",
Zlib => "ZLIB",
BZip2 => "BZIP2",
_ => "Unknown compression algorithm",
}
}
fn ksprefs(prefs: KeyServerPreferences) -> &'static str {
// This is wrong, but this is what the internal implementation
// does.
if prefs.no_modify() {
"No-modify(128)"
} else if KeyServerPreferences::empty().normalized_eq(&prefs) {
""
} else {
"Unknown key server preference"
}
}
fn subpacket(sp: &Subpacket) -> String {
let mut output: Vec<String> = Vec::new();
let tag = sp.tag();
let s = {
use SubpacketTag::*;
match tag {
SignatureCreationTime => "signature creation time",
SignatureExpirationTime => "signature expiration time",
ExportableCertification => "exportable certification",
TrustSignature => "trust signature",
RegularExpression => "regular expression",
Revocable => "revocable",
KeyExpirationTime => "key expiration time",
PlaceholderForBackwardCompatibility => "additional recipient request",
PreferredSymmetricAlgorithms => "preferred symmetric algorithms",
RevocationKey => "revocation key",
Issuer => "issuer key ID",
NotationData => "notation data",
PreferredHashAlgorithms => "preferred hash algorithms",
PreferredCompressionAlgorithms => "preferred compression algorithms",
KeyServerPreferences => "key server preferences",
PreferredKeyServer => "preferred key server",
PrimaryUserID => "primary user id",
PolicyURI => "policy URL",
KeyFlags => "key flags",
SignersUserID => "signer's user id",
ReasonForRevocation => "reason for revocation",
Features => "features",
EmbeddedSignature => "embedded signature",
_ => "Unknown signature subkey type",
}
};
output.push(s.into());
output.push(format!("({})", Into::<u8>::into(tag)));
if sp.critical() {
output.push(" *CRITICAL*".into());
}
{
use SubpacketValue::*;
match sp.value() {
PreferredSymmetricAlgorithms(algos) => {
output.push(" ".into());
output.push(
algos.iter()
.map(|a| {
format!("{}({})",
symalgo(*a),
Into::<u8>::into(*a))
})
.collect::<Vec<String>>()
.join(" "))
}
PreferredHashAlgorithms(algos) => {
output.push(" ".into());
output.push(
algos.iter()
.map(|a| {
format!("{}({})",
a.to_string(),
Into::<u8>::into(*a))
})
.collect::<Vec<String>>()
.join(" "))
}
PreferredCompressionAlgorithms(algos) => {
output.push(" ".into());
output.push(
algos.iter()
.map(|a| {
format!("{}({})",
compalgo(*a),
Into::<u8>::into(*a))
})
.collect::<Vec<String>>()
.join(" "))
}
KeyServerPreferences(prefs) => {
output.push(format!(" {}", ksprefs(prefs.clone())))
}
SignatureExpirationTime(d)
| KeyExpirationTime(d) =>
{
// expiration time is an offset from the creation
// time, but rpm's internal OpenPGP implementation
// treats it as an absolute time. As we're going
// for bug-for-bug compatibility here, we do the
// same.
let t = NaiveDateTime::from_timestamp_opt(
d.as_secs() as i64, 0)
// This is just compatibility, debugging
// output. Fallback to the unix epoch.
.unwrap_or_default();
let t = Utc::from_utc_datetime(&Utc, &t);
output.push(format!(" {}(0x{:08x})",
t.format("%c"),
d.as_secs()));
}
SignatureCreationTime(_)
| Issuer(_)
| KeyFlags(_) => (),
_ => {
use sequoia_openpgp::serialize::MarshalInto;
output.push(" ".into());
output.extend(
sp.value()
.to_vec()
.unwrap_or(Vec::new())
.into_iter()
.map(|b| format!("{:02x}", b)))
}
}
}
output.join("")
}
while let PacketParserResult::Some(pp) = ppr {
let (packet, next_ppr) = pp.recurse()?;
ppr = next_ppr;
// We only dump what rpm's internal OpenPGP implementation
// dumps. Other packets we silently ignore.
match packet {
Packet::Signature(sig) => {
// V4 Signature(2) DSA(17) SHA512(10) Generic certification of a User ID and Public Key(16)
// signature creation time(2)
// issuer key ID(16)
// signhash16 1418
eprintln!("V{} Signature(2) {}({}) {}({}) {}({})",
sig.version(),
pk_algo(sig.pk_algo()),
Into::<u8>::into(sig.pk_algo()),
sig.hash_algo().to_string(),
Into::<u8>::into(sig.hash_algo()),
sigtype(sig.typ()),
Into::<u8>::into(sig.typ()));
sig.hashed_area().iter().for_each(|sb| {
eprintln!(" {}", subpacket(sb));
});
sig.unhashed_area().iter().for_each(|sb| {
eprintln!(" {}", subpacket(sb));
});
eprintln!(" signhash16 {:02x}{:02x}",
sig.digest_prefix()[0],
sig.digest_prefix()[1]);
},
Packet::PublicKey(key) => {
// V4 Public Key(6) RSA(1) Tue Apr 7 08:52:57 2015(0x55239ae9)
let secs = key.creation_time()
.duration_since(SystemTime::UNIX_EPOCH)
.map(|d| d.as_secs())
.unwrap_or(0);
let t: DateTime::<Utc> = key.creation_time().into();
eprintln!("V{} Public Key(6) {}({}) {}(0x{:08x})",
key.version(),
pk_algo(key.pk_algo()),
Into::<u8>::into(key.pk_algo()),
t.format("%c"), secs);
}
Packet::PublicSubkey(key) => {
// Public Subkey(14) 045523a696010...
use sequoia_openpgp::serialize::MarshalInto;
let secs = key.creation_time()
.duration_since(SystemTime::UNIX_EPOCH)
.map(|d| d.as_secs())
.unwrap_or(0);
eprintln!("Public Subkey(14) {:02}{:08x}{:02x}{}",
key.version(), secs,
Into::<u8>::into(key.pk_algo()),
key.mpis().to_vec()
.unwrap_or_else(|_| Vec::new())
.into_iter()
.map(|b| format!("{:02x}", b))
.collect::<String>());
}
Packet::UserID(userid) => {
// User ID(13) "Neal H. Walfield <neal@walfield.org>"
eprintln!("User ID(13) {:?}",
String::from_utf8_lossy(userid.value()));
}
Packet::Unknown(_pkt) => (),
Packet::OnePassSig(_ops) => (),
Packet::SecretKey(_key) => (),
Packet::SecretSubkey(_key) => (),
Packet::Marker(_marker) => (),
Packet::Trust(_trust) => (),
Packet::UserAttribute(_ua) => (),
Packet::Literal(_lit) => (),
Packet::CompressedData(_cd) => (),
Packet::PKESK(_pkesk) => (),
Packet::SKESK(_skesk) => (),
Packet::SEIP(_seip) => (),
Packet::MDC(_mdc) => (),
Packet::AED(_aed) => (),
_ => (),
}
}
Ok(())
}
ffi!(
/// Parses and optionally prints to stdout a OpenPGP packet(s).
///
/// This function is deprecated and is scheduled for removal in rpm
/// 4.19.
///
/// @param pkts OpenPGP packet(s)
/// @param pktlen OpenPGP packet(s) length (no. of bytes)
/// @param(out) dig parsed output of signature/pubkey packet parameters
/// @param printing should packets be printed?
///
/// Returns 0 on success, -1 on failure.
fn _pgpPrtPkts(pkts: *const u8, pktslen: size_t,
dig: *mut PgpDig, printing: c_int)
-> Binary
{
let dig = check_mut!(dig);
let mut params: *mut PgpDigParams = std::ptr::null_mut();
if printing != 0 {
// We ignore any error here as this printing should not change
// the functions semantics.
let _ = dump_packets(check_slice!(pkts, pktslen));
}
let result = _pgpPrtParams(pkts, pktslen, 0, &mut params);
if result == -1 {
return Err(Error::Fail("Parse error".into()));
}
let params = claim_from_c!(params);
match params.obj {
PgpDigParamsObj::Cert(_) => dig.cert = Some(params),
PgpDigParamsObj::Subkey(_, _) => dig.cert = Some(params),
PgpDigParamsObj::Signature(_) => dig.sig = Some(params),
}
Ok(())
});
ffi!(
/// Create a container for parsed OpenPGP packet(s).
///
/// This function is deprecated and is scheduled for removal in rpm
/// 4.19.
///
/// @return container
fn _pgpNewDig() -> *mut PgpDig {
Ok(move_to_c!(PgpDig {
cert: None,
sig: None,
}))
});
ffi!(
/// Release (malloc'd) data from container.
///
/// This function is deprecated and is scheduled for removal in rpm
/// 4.19.
///
/// @param dig container
fn _pgpCleanDig(dig: *mut PgpDig) {
let dig = check_mut!(dig);
dig.cert = None;
dig.sig = None;
});
ffi!(
/// Destroy a container for parsed OpenPGP packet(s).
///
/// This function is deprecated and is scheduled for removal in rpm
/// 4.19.
///
/// @param dig container
/// @return NULL always
fn _pgpFreeDig(dig: Option<&mut PgpDig>) -> *mut PgpDig {
free!(dig);
Ok(std::ptr::null_mut())
});
ffi!(
/// Retrieve parameters for parsed OpenPGP packet(s).
///
/// This function is deprecated and is scheduled for removal in rpm
/// 4.19.
///
/// @param dig container
/// @param pkttype type of params to retrieve (signature / pubkey)
/// @return pointer to OpenPGP parameters, NULL on error/not found
fn _pgpDigGetParams(dig: *const PgpDig, pkttype: c_uint)
-> *const PgpDigParams
{
let dig = check_ptr!(dig);
let ptr = match Tag::from(pkttype as u8) {
Tag::PublicKey => {
if let Some(ref cert) = dig.cert {
cert.as_ref()
} else {
std::ptr::null()
}
}
Tag::Signature => {
if let Some(ref sig) = dig.sig {
sig.as_ref()
} else {
std::ptr::null()
}
}
_ => {
std::ptr::null()
}
};
Ok(ptr)
});
ffi!(
/// Verify a PGP signature.
///
/// This function is deprecated and is scheduled for removal in rpm
/// 4.19.
///
/// @param dig container
/// @param hashctx digest context
/// @return RPMRC_OK on success
fn _pgpVerifySig(dig: *const PgpDig,
ctx: *const digest::DigestContext) -> ErrorCode {
Err(
_pgpVerifySignature(
_pgpDigGetParams(dig, u8::from(Tag::PublicKey) as u32),
_pgpDigGetParams(dig, u8::from(Tag::Signature) as u32),
ctx).into())
});