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server_hs.rs
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server_hs.rs
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use msgs::enums::{ContentType, HandshakeType, ProtocolVersion};
use msgs::enums::{Compression, NamedCurve, ECPointFormat, CipherSuite};
use msgs::enums::{ExtensionType, AlertDescription};
use msgs::enums::ClientCertificateType;
use msgs::message::{Message, MessagePayload};
use msgs::base::Payload;
use msgs::handshake::{HandshakePayload, SupportedSignatureAlgorithms};
use msgs::handshake::{HandshakeMessagePayload, ServerHelloPayload, Random};
use msgs::handshake::{ClientHelloPayload, ServerExtension, SessionID};
use msgs::handshake::ConvertProtocolNameList;
use msgs::handshake::SignatureAndHashAlgorithm;
use msgs::handshake::{EllipticCurveList, SupportedCurves, ClientExtension};
use msgs::handshake::{ECPointFormatList, SupportedPointFormats};
use msgs::handshake::{ServerECDHParams, DigitallySignedStruct};
use msgs::handshake::{ServerKeyExchangePayload, ECDHEServerKeyExchange};
use msgs::handshake::{CertificateRequestPayload, NewSessionTicketPayload};
use msgs::handshake::SupportedMandatedSignatureAlgorithms;
use msgs::ccs::ChangeCipherSpecPayload;
use msgs::codec::Codec;
use msgs::persist;
use session::SessionSecrets;
use server::{ServerSessionImpl, ConnState};
use suites;
use sign;
use verify;
use util;
use error::TLSError;
use handshake::Expectation;
use std::sync::Arc;
use std::mem;
macro_rules! extract_handshake(
( $m:expr, $t:path ) => (
match $m.payload {
MessagePayload::Handshake(ref hsp) => match hsp.payload {
$t(ref hm) => Some(hm),
_ => None
},
_ => None
}
)
);
pub type HandleFunction = fn(&mut ServerSessionImpl, m: Message) -> Result<ConnState, TLSError>;
/* These are effectively operations on the ServerSessionImpl, variant on the
* connection state. They must not have state of their own -- so they're
* functions rather than a trait. */
pub struct Handler {
pub expect: Expectation,
pub handle: HandleFunction
}
fn process_extensions(sess: &mut ServerSessionImpl, hello: &ClientHelloPayload)
-> Result<Vec<ServerExtension>, TLSError> {
let mut ret = Vec::new();
/* ALPN */
let our_protocols = &sess.config.alpn_protocols;
let maybe_their_protocols = hello.get_alpn_extension();
if let Some(their_protocols) = maybe_their_protocols {
let their_proto_strings = their_protocols.to_strings();
if their_proto_strings.contains(&"".to_string()) {
return Err(TLSError::PeerMisbehavedError("client offered empty ALPN protocol".to_string()));
}
sess.alpn_protocol = util::first_in_both(&our_protocols, &their_proto_strings);
match sess.alpn_protocol {
Some(ref selected_protocol) => {
info!("Chosen ALPN protocol {:?}", selected_protocol);
ret.push(ServerExtension::make_alpn(selected_protocol.clone()))
},
_ => {}
};
}
/* Renegotiation.
* (We don't do reneg at all, but would support the secure version if we did.) */
let secure_reneg_offered =
hello.find_extension(ExtensionType::RenegotiationInfo).is_some() ||
hello.cipher_suites.contains(&CipherSuite::TLS_EMPTY_RENEGOTIATION_INFO_SCSV);
if secure_reneg_offered {
ret.push(ServerExtension::make_empty_renegotiation_info());
}
/* Tickets:
* If we get any SessionTicket extension and have tickets enabled,
* we send an ack. */
if hello.find_extension(ExtensionType::SessionTicket).is_some() &&
sess.config.ticketer.enabled() {
sess.handshake_data.send_ticket = true;
ret.push(ServerExtension::SessionTicketAcknowledgement);
}
Ok(ret)
}
fn emit_server_hello(sess: &mut ServerSessionImpl, hello: &ClientHelloPayload) -> Result<(), TLSError> {
let extensions = try!(process_extensions(sess, hello));
if sess.handshake_data.session_id.is_empty() {
let sessid = sess.config.session_storage.lock().unwrap()
.generate();
sess.handshake_data.session_id = sessid;
}
let sh = Message {
typ: ContentType::Handshake,
version: ProtocolVersion::TLSv1_2,
payload: MessagePayload::Handshake(
HandshakeMessagePayload {
typ: HandshakeType::ServerHello,
payload: HandshakePayload::ServerHello(
ServerHelloPayload {
server_version: ProtocolVersion::TLSv1_2,
random: Random::from_slice(&sess.handshake_data.randoms.server),
session_id: sess.handshake_data.session_id.clone(),
cipher_suite: sess.handshake_data.ciphersuite.unwrap().suite,
compression_method: Compression::Null,
extensions: extensions
}
)
}
)
};
debug!("sending server hello {:?}", sh);
sess.handshake_data.transcript.add_message(&sh);
sess.common.send_msg(sh, false);
Ok(())
}
fn emit_certificate(sess: &mut ServerSessionImpl) {
let cert_chain = sess.handshake_data.server_cert_chain.as_ref().unwrap().clone();
let c = Message {
typ: ContentType::Handshake,
version: ProtocolVersion::TLSv1_2,
payload: MessagePayload::Handshake(
HandshakeMessagePayload {
typ: HandshakeType::Certificate,
payload: HandshakePayload::Certificate(cert_chain)
}
)
};
sess.handshake_data.transcript.add_message(&c);
sess.common.send_msg(c, false);
}
fn emit_server_kx(sess: &mut ServerSessionImpl,
sigalg: &SignatureAndHashAlgorithm,
curve: &NamedCurve,
signer: Arc<Box<sign::Signer>>) -> Result<(), TLSError> {
let kx = try!({
let scs = sess.handshake_data.ciphersuite.as_ref().unwrap();
scs.start_server_kx(curve)
.ok_or_else(|| TLSError::PeerMisbehavedError("key exchange failed".to_string()))
});
let secdh = ServerECDHParams::new(curve, &kx.pubkey);
let mut msg = Vec::new();
msg.extend(&sess.handshake_data.randoms.client);
msg.extend(&sess.handshake_data.randoms.server);
secdh.encode(&mut msg);
let sig = try!(
signer.sign(&sigalg.hash, &msg)
.map_err(|_| TLSError::General("signing failed".to_string()))
);
let skx = ServerKeyExchangePayload::ECDHE(
ECDHEServerKeyExchange {
params: secdh,
dss: DigitallySignedStruct::new(sigalg, sig)
}
);
let m = Message {
typ: ContentType::Handshake,
version: ProtocolVersion::TLSv1_2,
payload: MessagePayload::Handshake(
HandshakeMessagePayload {
typ: HandshakeType::ServerKeyExchange,
payload: HandshakePayload::ServerKeyExchange(skx)
}
)
};
sess.handshake_data.kx_data = Some(kx);
sess.handshake_data.transcript.add_message(&m);
sess.common.send_msg(m, false);
Ok(())
}
fn emit_certificate_req(sess: &mut ServerSessionImpl) {
if !sess.config.client_auth_offer {
return;
}
let names = sess.config.client_auth_roots.get_subjects();
let cr = CertificateRequestPayload {
certtypes: vec![ ClientCertificateType::RSASign,
ClientCertificateType::ECDSASign ],
sigalgs: SupportedSignatureAlgorithms::supported_verify(),
canames: names
};
let m = Message {
typ: ContentType::Handshake,
version: ProtocolVersion::TLSv1_2,
payload: MessagePayload::Handshake(
HandshakeMessagePayload {
typ: HandshakeType::CertificateRequest,
payload: HandshakePayload::CertificateRequest(cr)
}
)
};
debug!("Sending CertificateRequest {:?}", m);
sess.handshake_data.transcript.add_message(&m);
sess.common.send_msg(m, false);
sess.handshake_data.doing_client_auth = true;
}
fn emit_server_hello_done(sess: &mut ServerSessionImpl) {
let m = Message {
typ: ContentType::Handshake,
version: ProtocolVersion::TLSv1_2,
payload: MessagePayload::Handshake(
HandshakeMessagePayload {
typ: HandshakeType::ServerHelloDone,
payload: HandshakePayload::ServerHelloDone
}
)
};
sess.handshake_data.transcript.add_message(&m);
sess.common.send_msg(m, false);
}
fn incompatible(sess: &mut ServerSessionImpl, why: &str) -> TLSError {
sess.common.send_fatal_alert(AlertDescription::HandshakeFailure);
TLSError::PeerIncompatibleError(why.to_string())
}
fn start_resumption(sess: &mut ServerSessionImpl,
client_hello: &ClientHelloPayload,
id: &SessionID,
resumedata: persist::ServerSessionValue) -> Result<ConnState, TLSError> {
info!("Resuming session");
/* The RFC underspecifies this case. Reject it, because someone's going to be
* disappointed. */
if sess.handshake_data.ciphersuite.as_ref().unwrap().suite != resumedata.cipher_suite {
return Err(TLSError::PeerMisbehavedError("client varied ciphersuite over resumption".to_string()));
}
sess.handshake_data.session_id = id.clone();
try!(emit_server_hello(sess, client_hello));
let hashalg = sess.handshake_data.ciphersuite.as_ref().unwrap().get_hash();
sess.secrets = Some(SessionSecrets::new_resume(&sess.handshake_data.randoms,
hashalg,
&resumedata.master_secret.0));
sess.start_encryption();
sess.handshake_data.valid_client_cert_chain = resumedata.client_cert_chain;
sess.handshake_data.doing_resume = true;
emit_ticket(sess);
emit_ccs(sess);
emit_finished(sess);
return Ok(ConnState::ExpectCCS);
}
fn handle_client_hello(sess: &mut ServerSessionImpl, m: Message) -> Result<ConnState, TLSError> {
let client_hello = extract_handshake!(m, HandshakePayload::ClientHello).unwrap();
if client_hello.client_version.get_u16() < ProtocolVersion::TLSv1_2.get_u16() {
sess.common.send_fatal_alert(AlertDescription::ProtocolVersion);
return Err(TLSError::PeerIncompatibleError("client does not support TLSv1_2".to_string()));
}
if !client_hello.compression_methods.contains(&Compression::Null) {
sess.common.send_fatal_alert(AlertDescription::IllegalParameter);
return Err(TLSError::PeerIncompatibleError("client did not offer Null compression".to_string()));
}
if client_hello.has_duplicate_extension() {
sess.common.send_fatal_alert(AlertDescription::DecodeError);
return Err(TLSError::PeerMisbehavedError("client sent duplicate extensions".to_string()));
}
/* Save their Random. */
client_hello.random.write_slice(&mut sess.handshake_data.randoms.client);
let default_sigalgs_ext = SupportedSignatureAlgorithms::default();
let sni_ext = client_hello.get_sni_extension();
let sigalgs_ext = client_hello.get_sigalgs_extension()
.unwrap_or(&default_sigalgs_ext);
let eccurves_ext = try!(client_hello.get_eccurves_extension()
.ok_or_else(|| incompatible(sess, "client didn't describe ec curves")));
let ecpoints_ext = try!(client_hello.get_ecpoints_extension()
.ok_or_else(|| incompatible(sess, "client didn't describe ec points")));
debug!("we got a clienthello {:?}", client_hello);
debug!("sni {:?}", sni_ext);
debug!("sigalgs {:?}", sigalgs_ext);
debug!("eccurves {:?}", eccurves_ext);
debug!("ecpoints {:?}", ecpoints_ext);
if !ecpoints_ext.contains(&ECPointFormat::Uncompressed) {
sess.common.send_fatal_alert(AlertDescription::IllegalParameter);
return Err(TLSError::PeerIncompatibleError("client didn't support uncompressed ec points".to_string()));
}
/* Choose a certificate. */
let maybe_cert_key = sess.config.cert_resolver.resolve(sni_ext, sigalgs_ext, eccurves_ext, ecpoints_ext);
if maybe_cert_key.is_err() {
sess.common.send_fatal_alert(AlertDescription::AccessDenied);
return Err(TLSError::General("no server certificate chain resolved".to_string()));
}
let (cert_chain, private_key) = maybe_cert_key.unwrap();
/* Reduce our supported ciphersuites by the certificate. */
let ciphersuites_suitable_for_cert = suites::reduce_given_sigalg(&sess.config.ciphersuites,
&private_key.algorithm());
sess.handshake_data.server_cert_chain = Some(cert_chain);
let maybe_ciphersuite = if sess.config.ignore_client_order {
suites::choose_ciphersuite_preferring_server(&client_hello.cipher_suites,
&ciphersuites_suitable_for_cert)
} else {
suites::choose_ciphersuite_preferring_client(&client_hello.cipher_suites,
&ciphersuites_suitable_for_cert)
};
if maybe_ciphersuite.is_none() {
return Err(incompatible(sess, "no ciphersuites in common"));
}
sess.handshake_data.ciphersuite = maybe_ciphersuite;
info!("decided upon suite {:?}", maybe_ciphersuite.as_ref().unwrap());
/* Start handshake hash. */
sess.handshake_data.start_handshake_hash();
sess.handshake_data.transcript.add_message(&m);
/* -- Check for resumption --
* We can do this either by (in order of preference):
* 1. receiving a ticket that decrypts
* 2. receiving a sessionid that is in our cache
*
* If we receive a ticket, the sessionid won't be in our
* cache, so don't check.
*
* If either works, we end up with a ServerSessionValue
* which is passed to start_resumption and concludes
* our handling of the ClientHello.
*/
let mut ticket_received = false;
if let Some(ticket_ext) = client_hello.get_ticket_extension() {
match ticket_ext {
&ClientExtension::SessionTicketOffer(ref ticket) => {
ticket_received = true;
info!("Ticket received");
let maybe_resume = sess.config.ticketer.decrypt(&ticket.0)
.and_then(|plain| persist::ServerSessionValue::read_bytes(&plain));
if maybe_resume.is_some() {
return start_resumption(sess,
client_hello,
&client_hello.session_id,
maybe_resume.unwrap());
} else {
info!("Ticket didn't decrypt");
}
}
// eg ClientExtension::SessionTicketRequest
_ => (),
}
}
/* Perhaps resume? If we received a ticket, the sessionid
* does not correspond to a real session. */
if !client_hello.session_id.is_empty() && !ticket_received {
let maybe_resume = {
let persist = sess.config.session_storage.lock().unwrap();
persist.get(&client_hello.session_id)
}.and_then(|x| persist::ServerSessionValue::read_bytes(&x));
if maybe_resume.is_some() {
return start_resumption(sess,
client_hello,
&client_hello.session_id,
maybe_resume.unwrap());
}
}
/* Now we have chosen a ciphersuite, we can make kx decisions. */
let sigalg = try!(
sess.handshake_data.ciphersuite.as_ref().unwrap()
.resolve_sig_alg(sigalgs_ext)
.ok_or_else(|| incompatible(sess, "no supported sigalg"))
);
let eccurve = try!(
util::first_in_both(EllipticCurveList::supported().as_slice(),
eccurves_ext.as_slice())
.ok_or_else(|| incompatible(sess, "no supported curve"))
);
let ecpoint = try!(
util::first_in_both(ECPointFormatList::supported().as_slice(),
ecpoints_ext.as_slice())
.ok_or_else(|| incompatible(sess, "no supported point format"))
);
debug_assert_eq!(ecpoint, ECPointFormat::Uncompressed);
try!(emit_server_hello(sess, client_hello));
emit_certificate(sess);
try!(emit_server_kx(sess, &sigalg, &eccurve, private_key));
emit_certificate_req(sess);
emit_server_hello_done(sess);
if sess.handshake_data.doing_client_auth {
Ok(ConnState::ExpectCertificate)
} else {
Ok(ConnState::ExpectClientKX)
}
}
pub static EXPECT_CLIENT_HELLO: Handler = Handler {
expect: Expectation {
content_types: &[ContentType::Handshake],
handshake_types: &[HandshakeType::ClientHello]
},
handle: handle_client_hello
};
/* --- Process client's Certificate for client auth --- */
fn handle_certificate(sess: &mut ServerSessionImpl, m: Message) -> Result<ConnState, TLSError> {
sess.handshake_data.transcript.add_message(&m);
let cert_chain = extract_handshake!(m, HandshakePayload::Certificate).unwrap();
if cert_chain.is_empty() && !sess.config.client_auth_mandatory {
info!("client auth requested but no certificate supplied");
sess.handshake_data.doing_client_auth = false;
sess.handshake_data.transcript.abandon_client_auth();
return Ok(ConnState::ExpectClientKX);
}
debug!("certs {:?}", cert_chain);
try!(
verify::verify_client_cert(&sess.config.client_auth_roots,
&cert_chain)
);
sess.handshake_data.valid_client_cert_chain = Some(cert_chain.clone());
Ok(ConnState::ExpectClientKX)
}
pub static EXPECT_CERTIFICATE: Handler = Handler {
expect: Expectation {
content_types: &[ContentType::Handshake],
handshake_types: &[HandshakeType::Certificate]
},
handle: handle_certificate
};
/* --- Process client's KeyExchange --- */
fn handle_client_kx(sess: &mut ServerSessionImpl, m: Message) -> Result<ConnState, TLSError> {
let client_kx = extract_handshake!(m, HandshakePayload::ClientKeyExchange).unwrap();
sess.handshake_data.transcript.add_message(&m);
/* Complete key agreement, and set up encryption with the
* resulting premaster secret. */
let kx = sess.handshake_data.kx_data.take().unwrap();
let kxd = try!(
kx.server_complete(&client_kx.0)
.ok_or_else(|| TLSError::PeerMisbehavedError("key exchange completion failed".to_string()))
);
let hashalg = sess.handshake_data.ciphersuite.as_ref().unwrap().get_hash();
sess.secrets = Some(SessionSecrets::new(&sess.handshake_data.randoms,
hashalg,
&kxd.premaster_secret));
sess.start_encryption();
if sess.handshake_data.doing_client_auth {
Ok(ConnState::ExpectCertificateVerify)
} else {
Ok(ConnState::ExpectCCS)
}
}
pub static EXPECT_CLIENT_KX: Handler = Handler {
expect: Expectation {
content_types: &[ContentType::Handshake],
handshake_types: &[HandshakeType::ClientKeyExchange]
},
handle: handle_client_kx
};
/* --- Process client's certificate proof --- */
fn handle_certificate_verify(sess: &mut ServerSessionImpl, m: Message) -> Result<ConnState, TLSError> {
let rc = {
let sig = extract_handshake!(m, HandshakePayload::CertificateVerify).unwrap();
let certs = sess.handshake_data.valid_client_cert_chain.as_ref().unwrap();
let handshake_msgs = sess.handshake_data.transcript.take_handshake_buf();
verify::verify_signed_struct(&handshake_msgs, &certs[0], &sig)
};
if rc.is_err() {
sess.common.send_fatal_alert(AlertDescription::AccessDenied);
return Err(rc.unwrap_err());
} else {
debug!("client CertificateVerify OK");
}
sess.handshake_data.transcript.add_message(&m);
Ok(ConnState::ExpectCCS)
}
pub static EXPECT_CERTIFICATE_VERIFY: Handler = Handler {
expect: Expectation {
content_types: &[ContentType::Handshake],
handshake_types: &[HandshakeType::CertificateVerify]
},
handle: handle_certificate_verify
};
/* --- Process client's ChangeCipherSpec --- */
fn handle_ccs(sess: &mut ServerSessionImpl, _m: Message) -> Result<ConnState, TLSError> {
/* CCS should not be received interleaved with fragmented handshake-level
* message. */
if !sess.common.handshake_joiner.empty() {
warn!("CCS received interleaved with fragmented handshake");
return Err(TLSError::InappropriateMessage {
expect_types: vec![ ContentType::Handshake ],
got_type: ContentType::ChangeCipherSpec
});
}
sess.common.peer_now_encrypting();
Ok(ConnState::ExpectFinished)
}
pub static EXPECT_CCS: Handler = Handler {
expect: Expectation {
content_types: &[ContentType::ChangeCipherSpec],
handshake_types: &[]
},
handle: handle_ccs
};
/* --- Process client's Finished --- */
fn emit_ticket(sess: &mut ServerSessionImpl) {
if !sess.handshake_data.send_ticket {
return;
}
/* If we can't produce a ticket for some reason, we can't
* report an error. Send an empty one. */
let plain = get_server_session_value(sess).get_encoding();
let ticket = sess.config.ticketer.encrypt(&plain)
.unwrap_or_else(|| Vec::new());
let ticket_lifetime = sess.config.ticketer.get_lifetime();
let m = Message {
typ: ContentType::Handshake,
version: ProtocolVersion::TLSv1_2,
payload: MessagePayload::Handshake(
HandshakeMessagePayload {
typ: HandshakeType::NewSessionTicket,
payload: HandshakePayload::NewSessionTicket(NewSessionTicketPayload::new(ticket_lifetime, ticket))
}
)
};
sess.handshake_data.transcript.add_message(&m);
sess.common.send_msg(m, false);
}
fn emit_ccs(sess: &mut ServerSessionImpl) {
let m = Message {
typ: ContentType::ChangeCipherSpec,
version: ProtocolVersion::TLSv1_2,
payload: MessagePayload::ChangeCipherSpec(ChangeCipherSpecPayload {})
};
sess.common.send_msg(m, false);
sess.common.we_now_encrypting();
}
fn emit_finished(sess: &mut ServerSessionImpl) {
let vh = sess.handshake_data.transcript.get_current_hash();
let verify_data = sess.secrets.as_ref().unwrap().server_verify_data(&vh);
let verify_data_payload = Payload::new(verify_data);
let f = Message {
typ: ContentType::Handshake,
version: ProtocolVersion::TLSv1_2,
payload: MessagePayload::Handshake(
HandshakeMessagePayload {
typ: HandshakeType::Finished,
payload: HandshakePayload::Finished(verify_data_payload)
}
)
};
sess.handshake_data.transcript.add_message(&f);
sess.common.send_msg(f, true);
}
fn get_server_session_value(sess: &ServerSessionImpl) -> persist::ServerSessionValue {
let scs = sess.handshake_data.ciphersuite.as_ref().unwrap();
let client_certs = &sess.handshake_data.valid_client_cert_chain;
persist::ServerSessionValue::new(&scs.suite,
sess.secrets.as_ref().unwrap().get_master_secret(),
client_certs)
}
fn handle_finished(sess: &mut ServerSessionImpl, m: Message) -> Result<ConnState, TLSError> {
let finished = extract_handshake!(m, HandshakePayload::Finished).unwrap();
let vh = sess.handshake_data.transcript.get_current_hash();
let expect_verify_data = sess.secrets.as_ref().unwrap().client_verify_data(&vh);
use ring;
try!(
ring::constant_time::verify_slices_are_equal(&expect_verify_data, &finished.0)
.map_err(|_| { error!("Finished wrong"); TLSError::DecryptError })
);
/* Save session, perhaps */
if !sess.handshake_data.doing_resume && !sess.handshake_data.session_id.is_empty() {
let value = get_server_session_value(sess);
let mut persist = sess.config.session_storage.lock().unwrap();
if persist.put(&sess.handshake_data.session_id, value.get_encoding()) {
info!("Session saved");
} else {
info!("Session not saved");
}
}
/* Send our CCS and Finished. */
sess.handshake_data.transcript.add_message(&m);
if !sess.handshake_data.doing_resume {
emit_ticket(sess);
emit_ccs(sess);
emit_finished(sess);
}
Ok(ConnState::Traffic)
}
pub static EXPECT_FINISHED: Handler = Handler {
expect: Expectation {
content_types: &[ContentType::Handshake],
handshake_types: &[HandshakeType::Finished]
},
handle: handle_finished
};
/* --- Process traffic --- */
fn handle_traffic(sess: &mut ServerSessionImpl, mut m: Message) -> Result<ConnState, TLSError> {
sess.common.take_received_plaintext(m.take_opaque_payload().unwrap());
Ok(ConnState::Traffic)
}
pub static TRAFFIC: Handler = Handler {
expect: Expectation {
content_types: &[ContentType::ApplicationData],
handshake_types: &[]
},
handle: handle_traffic
};