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|
/// A simple signature verification program.
///
/// See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=872271 for
/// the motivation.
extern crate clap;
extern crate failure;
use failure::ResultExt;
extern crate time;
extern crate sequoia_openpgp as openpgp;
use std::process::exit;
use std::fs::File;
use std::collections::{HashMap, HashSet};
use crate::openpgp::{TPK, Packet, packet::Signature, KeyID, RevocationStatus};
use crate::openpgp::constants::HashAlgorithm;
use crate::openpgp::crypto::hash::Hash;
use crate::openpgp::parse::{Parse, PacketParserResult, PacketParser};
use crate::openpgp::tpk::TPKParser;
mod sqv_cli;
fn real_main() -> Result<(), failure::Error> {
let matches = sqv_cli::build().get_matches();
let trace = matches.is_present("trace");
let good_threshold
= if let Some(good_threshold) = matches.value_of("signatures") {
match good_threshold.parse::<usize>() {
Ok(good_threshold) => good_threshold,
Err(err) => {
eprintln!("Value passed to --signatures must be numeric: \
{} (got: {:?}).",
err, good_threshold);
exit(2);
},
}
} else {
1
};
if good_threshold < 1 {
eprintln!("Value passed to --signatures must be >= 1 (got: {:?}).",
good_threshold);
exit(2);
}
let not_before = if let Some(t) = matches.value_of("not-before") {
Some(time::strptime(t, "%Y-%m-%d")
.context(format!("Bad value passed to --not-before: {:?}", t))?)
} else {
None
};
let not_after = if let Some(t) = matches.value_of("not-after") {
Some(time::strptime(t, "%Y-%m-%d")
.context(format!("Bad value passed to --not-after: {:?}", t))?)
} else {
None
}.unwrap_or_else(|| time::now_utc());
// First, we collect the signatures and the alleged issuers.
// Then, we scan the keyrings exactly once to find the associated
// TPKs.
// .unwrap() is safe, because "sig-file" is required.
let sig_file = matches.value_of_os("sig-file").unwrap();
let mut ppr = PacketParser::from_file(sig_file)?;
let mut sigs_seen = HashSet::new();
let mut sigs : Vec<(Signature, KeyID, Option<TPK>)> = Vec::new();
// sig_i is count of all Signature packets that we've seen. This
// may be more than sigs.len() if we can't handle some of the
// sigs.
let mut sig_i = 0;
while let PacketParserResult::Some(pp) = ppr {
let (packet, ppr_tmp) = pp.recurse().unwrap();
ppr = ppr_tmp;
match packet {
Packet::Signature(sig) => {
// To check for duplicates, we normalize the
// signature, and put it into the hashset of seen
// signatures.
let mut sig_normalized = sig.clone();
sig_normalized.unhashed_area_mut().clear();
if sigs_seen.replace(sig_normalized).is_some() {
eprintln!("Ignoring duplicate signature.");
continue;
}
sig_i += 1;
if let Some(fp) = sig.issuer_fingerprint() {
if trace {
eprintln!("Will check signature allegedly issued by {}.",
fp);
}
// XXX: We use a KeyID even though we have a
// fingerprint!
sigs.push((sig, fp.to_keyid(), None));
} else if let Some(keyid) = sig.issuer() {
if trace {
eprintln!("Will check signature allegedly issued by {}.",
keyid);
}
sigs.push((sig, keyid, None));
} else {
eprintln!("Signature #{} does not contain information \
about the issuer. Unable to validate.",
sig_i);
}
},
Packet::CompressedData(_) => {
// Skip it.
},
packet => {
eprintln!("OpenPGP message is not a detached signature. \
Encountered unexpected packet: {:?} packet.",
packet.tag());
exit(2);
}
}
}
if sigs.len() == 0 {
eprintln!("{:?} does not contain an OpenPGP signature.", sig_file);
exit(2);
}
// Hash the content.
// .unwrap() is safe, because "file" is required.
let file = matches.value_of_os("file").unwrap();
let hash_algos : Vec<HashAlgorithm>
= sigs.iter().map(|&(ref sig, _, _)| sig.hash_algo()).collect();
let hashes: HashMap<_, _> =
openpgp::crypto::hash_file(File::open(file)?, &hash_algos[..])?
.into_iter().collect();
fn tpk_has_key(tpk: &TPK, keyid: &KeyID) -> bool {
// Even if a key is revoked or expired, we can still use it to
// verify a message.
tpk.keys_all().any(|(_, _, k)| *keyid == k.keyid())
}
// Find the keys.
for filename in matches.values_of_os("keyring")
.expect("No keyring specified.")
{
// Load the keyring.
let tpks : Vec<TPK> = TPKParser::from_file(filename)?
.unvalidated_tpk_filter(|tpk, _| {
for &(_, ref issuer, _) in &sigs {
if tpk_has_key(tpk, issuer) {
return true;
}
}
false
})
.map(|tpkr| {
match tpkr {
Ok(tpk) => tpk,
Err(err) => {
eprintln!("Error reading keyring {:?}: {}",
filename, err);
exit(2);
}
}
})
.collect();
for tpk in tpks {
for &mut (_, ref issuer, ref mut issuer_tpko) in sigs.iter_mut() {
if
|