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dnscrypt_certs.rs
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dnscrypt_certs.rs
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use crate::anonymized_dns::*;
use crate::config::*;
use crate::crypto::*;
use crate::dnscrypt::*;
use crate::globals::*;
use byteorder::{BigEndian, ByteOrder};
use clockpro_cache::ClockProCache;
use parking_lot::Mutex;
use std::mem;
use std::slice;
use std::sync::Arc;
use std::time::SystemTime;
pub const DNSCRYPT_CERTS_TTL: u32 = 86400;
pub const DNSCRYPT_CERTS_RENEWAL: u32 = 28800;
fn now() -> u32 {
SystemTime::now()
.duration_since(SystemTime::UNIX_EPOCH)
.expect("The clock is completely off")
.as_secs() as _
}
#[derive(Debug, Default, Clone, Serialize, Deserialize)]
#[repr(C, packed)]
pub struct DNSCryptCertInner {
resolver_pk: [u8; 32],
client_magic: [u8; 8],
serial: [u8; 4],
ts_start: [u8; 4],
ts_end: [u8; 4],
}
impl DNSCryptCertInner {
pub fn as_bytes(&self) -> &[u8] {
unsafe { slice::from_raw_parts(self as *const _ as *const u8, mem::size_of_val(self)) }
}
}
big_array! { BigArray; }
#[derive(Derivative, Serialize, Deserialize)]
#[derivative(Debug, Default, Clone)]
#[repr(C, packed)]
pub struct DNSCryptCert {
cert_magic: [u8; 4],
es_version: [u8; 2],
minor_version: [u8; 2],
#[derivative(Debug = "ignore", Default(value = "[0u8; 64]"))]
#[serde(with = "BigArray")]
signature: [u8; 64],
inner: DNSCryptCertInner,
}
impl DNSCryptCert {
pub fn new(provider_kp: &SignKeyPair, resolver_kp: &CryptKeyPair) -> Self {
let ts_start = now();
let ts_end = ts_start + DNSCRYPT_CERTS_TTL;
let mut dnscrypt_cert = DNSCryptCert::default();
let dnscrypt_cert_inner = &mut dnscrypt_cert.inner;
dnscrypt_cert_inner
.resolver_pk
.copy_from_slice(resolver_kp.pk.as_bytes());
dnscrypt_cert_inner
.client_magic
.copy_from_slice(&dnscrypt_cert_inner.resolver_pk[..8]);
BigEndian::write_u32(&mut dnscrypt_cert_inner.serial, 1);
BigEndian::write_u32(&mut dnscrypt_cert_inner.ts_start, ts_start);
BigEndian::write_u32(&mut dnscrypt_cert_inner.ts_end, ts_end);
BigEndian::write_u32(&mut dnscrypt_cert.cert_magic, 0x44_4e_53_43);
BigEndian::write_u16(&mut dnscrypt_cert.es_version, 2);
BigEndian::write_u16(&mut dnscrypt_cert.minor_version, 0);
dnscrypt_cert.signature.copy_from_slice(
provider_kp
.sk
.sign(dnscrypt_cert_inner.as_bytes())
.as_bytes(),
);
dnscrypt_cert
}
pub fn as_bytes(&self) -> &[u8] {
unsafe { slice::from_raw_parts(self as *const _ as *const u8, mem::size_of_val(self)) }
}
pub fn client_magic(&self) -> &[u8] {
&self.inner.client_magic
}
pub fn ts_end(&self) -> u32 {
BigEndian::read_u32(&self.inner.ts_end)
}
}
#[derive(Serialize, Deserialize, Clone, Derivative)]
#[derivative(Debug)]
pub struct DNSCryptEncryptionParams {
dnscrypt_cert: DNSCryptCert,
resolver_kp: CryptKeyPair,
#[serde(skip)]
#[derivative(Debug = "ignore")]
pub cache: Option<Arc<Mutex<ClockProCache<[u8; DNSCRYPT_QUERY_PK_SIZE], SharedKey>>>>,
}
impl DNSCryptEncryptionParams {
pub fn new(provider_kp: &SignKeyPair, cache_capacity: usize) -> Self {
let mut resolver_kp;
while {
resolver_kp = CryptKeyPair::new();
resolver_kp.pk.as_bytes()
== &ANONYMIZED_DNSCRYPT_QUERY_MAGIC[..DNSCRYPT_QUERY_MAGIC_SIZE]
} {}
let dnscrypt_cert = DNSCryptCert::new(&provider_kp, &resolver_kp);
let cache = ClockProCache::new(cache_capacity).unwrap();
DNSCryptEncryptionParams {
dnscrypt_cert,
resolver_kp,
cache: Some(Arc::new(Mutex::new(cache))),
}
}
pub fn add_key_cache(&mut self, cache_capacity: usize) {
let cache = ClockProCache::new(cache_capacity).unwrap();
self.cache = Some(Arc::new(Mutex::new(cache)));
}
pub fn client_magic(&self) -> &[u8] {
self.dnscrypt_cert.client_magic()
}
pub fn dnscrypt_cert(&self) -> &DNSCryptCert {
&self.dnscrypt_cert
}
pub fn resolver_kp(&self) -> &CryptKeyPair {
&self.resolver_kp
}
}
pub struct DNSCryptEncryptionParamsUpdater {
globals: Arc<Globals>,
}
impl DNSCryptEncryptionParamsUpdater {
pub fn new(globals: Arc<Globals>) -> Self {
DNSCryptEncryptionParamsUpdater { globals }
}
pub fn update(&self) {
let now = now();
let mut new_params_set = vec![];
{
let params_set = self.globals.dnscrypt_encryption_params_set.read();
for params in &**params_set {
if params.dnscrypt_cert().ts_end() >= now {
new_params_set.push(params.clone());
}
}
}
let new_params = DNSCryptEncryptionParams::new(
&self.globals.provider_kp,
self.globals.key_cache_capacity,
);
new_params_set.push(Arc::new(new_params));
let state = State {
provider_kp: self.globals.provider_kp.clone(),
dnscrypt_encryption_params_set: new_params_set.iter().map(|x| (**x).clone()).collect(),
};
let state_file = self.globals.state_file.to_path_buf();
self.globals.runtime_handle.spawn(async move {
let _ = state.async_save(state_file).await;
});
*self.globals.dnscrypt_encryption_params_set.write() = Arc::new(new_params_set);
debug!("New certificate issued");
}
pub async fn run(self) {
let mut fut_interval = tokio::time::interval(std::time::Duration::from_secs(u64::from(
DNSCRYPT_CERTS_RENEWAL,
)));
let fut = async move {
loop {
fut_interval.tick().await;
self.update();
debug!("New cert issued");
}
};
fut.await
}
}