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|
use hex::FromHex;
use std::net::{IpAddr, SocketAddr};
use subtle::ConstantTimeEq;
use x25519_dalek::{PublicKey, StaticSecret};
use super::{ConfigError, Configuration};
enum ParserState {
Peer(ParsedPeer),
Interface,
}
struct ParsedPeer {
public_key: PublicKey,
update_only: bool,
allowed_ips: Vec<(IpAddr, u32)>,
remove: bool,
preshared_key: Option<[u8; 32]>,
replace_allowed_ips: bool,
persistent_keepalive_interval: Option<u64>,
protocol_version: Option<usize>,
endpoint: Option<SocketAddr>,
}
pub struct LineParser<'a, C: Configuration> {
config: &'a C,
state: ParserState,
}
impl<'a, C: Configuration> LineParser<'a, C> {
pub fn new(config: &'a C) -> LineParser<'a, C> {
LineParser {
config,
state: ParserState::Interface,
}
}
fn new_peer(value: &str) -> Result<ParserState, ConfigError> {
match <[u8; 32]>::from_hex(value) {
Ok(pk) => Ok(ParserState::Peer(ParsedPeer {
public_key: PublicKey::from(pk),
remove: false,
update_only: false,
allowed_ips: vec![],
preshared_key: None,
replace_allowed_ips: false,
persistent_keepalive_interval: None,
protocol_version: None,
endpoint: None,
})),
Err(_) => Err(ConfigError::InvalidHexValue),
}
}
pub fn parse_line(&mut self, key: &str, value: &str) -> Result<(), ConfigError> {
// flush peer updates to configuration
fn flush_peer<C: Configuration>(config: &C, peer: &ParsedPeer) -> Option<ConfigError> {
if peer.remove {
log::trace!("flush peer, remove peer");
config.remove_peer(&peer.public_key);
return None;
}
if !peer.update_only {
log::trace!("flush peer, add peer");
config.add_peer(&peer.public_key);
}
for (ip, cidr) in &peer.allowed_ips {
log::trace!("flush peer, add allowed_ips : {}/{}", ip.to_string(), cidr);
config.add_allowed_ip(&peer.public_key, *ip, *cidr);
}
if let Some(psk) = peer.preshared_key {
log::trace!("flush peer, set preshared_key {}", hex::encode(psk));
config.set_preshared_key(&peer.public_key, psk);
}
if let Some(secs) = peer.persistent_keepalive_interval {
log::trace!("flush peer, set persistent_keepalive_interval {}", secs);
config.set_persistent_keepalive_interval(&peer.public_key, secs);
}
if let Some(version) = peer.protocol_version {
log::trace!("flush peer, set protocol_version {}", version);
if version == 0 || version > config.get_protocol_version() {
return Some(ConfigError::UnsupportedProtocolVersion);
}
}
if let Some(endpoint) = peer.endpoint {
log::trace!("flush peer, set endpoint {}", endpoint.to_string());
config.set_endpoint(&peer.public_key, endpoint);
};
None
};
// parse line and update parser state
match self.state {
// configure the interface
ParserState::Interface => match key {
// opt: set private key
"private_key" => match <[u8; 32]>::from_hex(value) {
Ok(sk) => {
self.config.set_private_key(if sk.ct_eq(&[0u8; 32]).into() {
None
} else {
Some(StaticSecret::from(sk))
});
Ok(())
}
Err(_) => Err(ConfigError::InvalidHexValue),
},
// opt: set listen port
"listen_port" => match value.parse() {
Ok(port) => {
self.config.set_listen_port(Some(port))?;
Ok(())
}
Err(_) => Err(ConfigError::InvalidPortNumber),
},
// opt: set fwmark
"fwmark" => match value.parse() {
Ok(fwmark) => {
self.config
.set_fwmark(if fwmark == 0 { None } else { Some(fwmark) })?;
Ok(())
}
Err(_) => Err(ConfigError::InvalidFwmark),
},
// opt: remove all peers
"replace_peers" => match value {
"true" => {
for p in self.config.get_peers() {
self.config.remove_peer(&p.public_key)
}
Ok(())
}
_ => Err(ConfigError::UnsupportedValue),
},
// opt: transition to peer configuration
"public_key" => {
self.state = Self::new_peer(value)?;
Ok(())
}
// ignore (end of transcript)
"" => Ok(()),
// unknown key
_ => Err(ConfigError::InvalidKey),
},
// configure peers
ParserState::Peer(ref mut peer) => match key {
// opt: new peer
"public_key" => {
flush_peer(self.config, &peer);
self.state = Self::new_peer(value)?;
Ok(())
}
// opt: remove peer
"remove" => {
peer.remove = true;
Ok(())
}
// opt: update only
"update_only" => {
peer.update_only = true;
Ok(())
}
// opt: set preshared key
"preshared_key" => match <[u8; 32]>::from_hex(value) {
Ok(psk) => {
peer.preshared_key = Some(psk);
Ok(())
}
Err(_) => Err(ConfigError::InvalidHexValue),
},
// opt: set endpoint
"endpoint" => match value.parse() {
Ok(endpoint) => {
peer.endpoint = Some(endpoint);
Ok(())
}
Err(_) => Err(ConfigError::InvalidSocketAddr),
},
// opt: set persistent keepalive interval
"persistent_keepalive_interval" => match value.parse() {
Ok(secs) => {
peer.persistent_keepalive_interval = Some(secs);
Ok(())
}
Err(_) => Err(ConfigError::InvalidKeepaliveInterval),
},
// opt replace allowed ips
"replace_allowed_ips" => {
peer.replace_allowed_ips = true;
peer.allowed_ips.clear();
Ok(())
}
// opt add allowed ips
"allowed_ip" => {
let mut split = value.splitn(2, "/");
let addr = split.next().and_then(|x| x.parse().ok());
let cidr = split.next().and_then(|x| x.parse().ok());
match (addr, cidr) {
(Some(addr), Some(cidr)) => {
peer.allowed_ips.push((addr, cidr));
Ok(())
}
_ => Err(ConfigError::InvalidAllowedIp),
}
}
// set protocol version of peer
"protocol_version" => {
let parse_res: Result<usize, _> = value.parse();
match parse_res {
Ok(version) => {
peer.protocol_version = Some(version);
Ok(())
}
Err(_) => Err(ConfigError::UnsupportedProtocolVersion),
}
}
// flush (used at end of transcipt)
"" => {
log::trace!("UAPI, Set, processes end of transaction");
flush_peer(self.config, &peer);
Ok(())
}
// unknown key
_ => Err(ConfigError::InvalidKey),
},
}
}
}
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