samplecode/tls/tlsserver/enclave/src/lib.rs - incubator-teaclave-sgx-sdk - Git at Google

 // Copyright (C) 2017-2019 Baidu, Inc. All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions
 // are met:
 //
 //  * Redistributions of source code must retain the above copyright
 //    notice, this list of conditions and the following disclaimer.
 //  * Redistributions in binary form must reproduce the above copyright
 //    notice, this list of conditions and the following disclaimer in
 //    the documentation and/or other materials provided with the
 //    distribution.
 //  * Neither the name of Baidu, Inc., nor the names of its
 //    contributors may be used to endorse or promote products derived
 //    from this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 #![crate_name = "tlsserver"]
 #![crate_type = "staticlib"]

 #![cfg_attr(not(target_env = "sgx"), no_std)]
 #![cfg_attr(target_env = "sgx", feature(rustc_private))]

 extern crate sgx_types;
 extern crate sgx_trts;
 #[cfg(not(target_env = "sgx"))]
 #[macro_use]
 extern crate sgx_tstd as std;

 #[macro_use]
 extern crate lazy_static;

 use sgx_types::*;
 use sgx_trts::trts::{rsgx_raw_is_outside_enclave, rsgx_lfence, rsgx_sfence};

 use std::untrusted::fs;
 use std::io::BufReader;

 use std::ffi::CStr;
 use std::os::raw::c_char;

 use std::vec::Vec;
 use std::boxed::Box;
 use std::io::{Read, Write};
 use std::slice;
 use std::sync::{Arc, SgxRwLock};
 use std::net::TcpStream;
 use std::collections::HashMap;
 use std::sync::atomic::{AtomicUsize, AtomicPtr, Ordering};

 extern crate webpki;
 extern crate rustls;
 use rustls::{Session, NoClientAuth};

 pub struct TlsServer {
     socket: TcpStream,
     tls_session: rustls::ServerSession,
 }

 static GLOBAL_CONTEXT_COUNT: AtomicUsize = AtomicUsize::new(0);

 lazy_static! {
     static ref GLOBAL_CONTEXTS: SgxRwLock<HashMap<usize, AtomicPtr<TlsServer>>> = {
         SgxRwLock::new(HashMap::new())
     };
 }

 impl TlsServer {
     fn new(fd: c_int, cfg: Arc<rustls::ServerConfig>) -> TlsServer {
         TlsServer {
             socket: TcpStream::new(fd).unwrap(),
             tls_session: rustls::ServerSession::new(&cfg)
         }
     }

     fn do_read(&mut self) -> c_int {
         // Read TLS data.  This fails if the underlying TCP connection
         // is broken.
         let rc = self.tls_session.read_tls(&mut self.socket);
         if rc.is_err() {
             println!("TLS read error: {:?}", rc);
             return -1;
         }

         // If we're ready but there's no data: EOF.
         if rc.unwrap() == 0 {
             println!("EOF");
             return -1;
         }

         // Reading some TLS data might have yielded new TLS
         // messages to process.  Errors from this indicate
         // TLS protocol problems and are fatal.
         let processed = self.tls_session.process_new_packets();
         if processed.is_err() {
             println!("TLS error: {:?}", processed.unwrap_err());
             return -1;
         }
         return 0;
     }

     fn read(&mut self, plaintext: &mut Vec<u8>) -> c_int {
         // Having read some TLS data, and processed any new messages,
         // we might have new plaintext as a result.
         //
         // Read it and then write it to stdout.
         let rc = self.tls_session.read_to_end(plaintext);

         // If that fails, the peer might have started a clean TLS-level
         // session closure.
         if rc.is_err() {
             let err = rc.unwrap_err();
             println!("Plaintext read error: {:?}", err);
             return -1;
         }
         plaintext.len() as c_int
     }

     // fn is_traffic(&self) -> bool {
     //     !self.tls_session.is_handshaking()
     // }

     fn write(&mut self, plaintext: &[u8]) -> c_int{
         self.tls_session.write(plaintext).unwrap() as c_int
     }

     fn do_write(&mut self) {
         self.tls_session.write_tls(&mut self.socket).unwrap();
     }
 }

 fn load_certs(filename: &str) -> Vec<rustls::Certificate> {
     let certfile = fs::File::open(filename).expect("cannot open certificate file");
     let mut reader = BufReader::new(certfile);
     rustls::internal::pemfile::certs(&mut reader).unwrap()
 }

 fn load_private_key(filename: &str) -> rustls::PrivateKey {
     let rsa_keys = {
         let keyfile = fs::File::open(filename)
             .expect("cannot open private key file");
         let mut reader = BufReader::new(keyfile);
         rustls::internal::pemfile::rsa_private_keys(&mut reader)
             .expect("file contains invalid rsa private key")
     };

     let pkcs8_keys = {
         let keyfile = fs::File::open(filename)
             .expect("cannot open private key file");
         let mut reader = BufReader::new(keyfile);
         rustls::internal::pemfile::pkcs8_private_keys(&mut reader)
             .expect("file contains invalid pkcs8 private key (encrypted keys not supported)")
     };

     // prefer to load pkcs8 keys
     if !pkcs8_keys.is_empty() {
         pkcs8_keys[0].clone()
     } else {
         assert!(!rsa_keys.is_empty());
         rsa_keys[0].clone()
     }
 }

 fn make_config(cert: &str, key: &str) -> Arc<rustls::ServerConfig> {

     let mut config = rustls::ServerConfig::new(NoClientAuth::new());

     let certs = load_certs(cert);
     let privkey = load_private_key(key);
     config.set_single_cert_with_ocsp_and_sct(certs, privkey, vec![], vec![]).unwrap();

     Arc::new(config)
 }

 struct Sessions;

 impl Sessions {
     fn new_session(svr_ptr : *mut TlsServer) -> Option<usize> {
         match GLOBAL_CONTEXTS.write() {
             Ok(mut gctxts) => {
                 let curr_id = GLOBAL_CONTEXT_COUNT.fetch_add(1, Ordering::SeqCst);
                 gctxts.insert(curr_id, AtomicPtr::new(svr_ptr));
                 Some(curr_id)
             },
             Err(x) => {
                 println!("Locking global context SgxRwLock failed! {:?}", x);
                 None
             },
         }
     }

     fn get_session(sess_id: size_t) -> Option<*mut TlsServer> {
         match GLOBAL_CONTEXTS.read() {
             Ok(gctxts) => {
                 match gctxts.get(&sess_id) {
                     Some(s) => {
                         Some(s.load(Ordering::SeqCst))
                     },
                     None => {
                         println!("Global contexts cannot find session id = {}", sess_id);
                         None
                     }
                 }
             },
             Err(x) => {
                 println!("Locking global context SgxRwLock failed on get_session! {:?}", x);
                 None
             },
         }
     }

     fn remove_session(sess_id: size_t) {
         if let Ok(mut gctxts) = GLOBAL_CONTEXTS.write() {
             if let Some(session_ptr) = gctxts.get(&sess_id) {
                 let session_ptr = session_ptr.load(Ordering::SeqCst);
                 let session = unsafe { &mut *session_ptr };
                 let _ = unsafe { Box::<TlsServer>::from_raw(session as *mut _) };
                 let _ = gctxts.remove(&sess_id);
             }
         }
     }
 }

 #[no_mangle]
 pub extern "C" fn tls_server_new(fd: c_int, cert: * const c_char, key: * const c_char) -> usize {
     let certfile = unsafe { CStr::from_ptr(cert).to_str() };
     if certfile.is_err() {
         return 0xFFFF_FFFF_FFFF_FFFF;
     }
     let keyfile = unsafe { CStr::from_ptr(key).to_str() };
     if keyfile.is_err() {
         return 0xFFFF_FFFF_FFFF_FFFF;
     }
     let config = make_config(certfile.unwrap(), keyfile.unwrap());

     let p: *mut TlsServer = Box::into_raw(Box::new(TlsServer::new(fd, config)));
     match Sessions::new_session(p) {
         Some(s) => s,
         None => 0xFFFF_FFFF_FFFF_FFFF,
     }
 }

 #[no_mangle]
 pub extern "C" fn tls_server_read(session_id: size_t, buf: * mut c_char, cnt: c_int) -> c_int {
     if let Some(session_ptr) = Sessions::get_session(session_id) {
         let session = unsafe { &mut *(session_ptr) };
         if buf.is_null() || cnt == 0 {
             // just read_tls
             session.do_read()
         } else {
             if !rsgx_raw_is_outside_enclave(buf as * const u8, cnt as usize) {
                 return -1;
             }
             // read plain buffer
             let mut plaintext = Vec::new();
             let mut result = session.read(&mut plaintext);
             if result == -1 {
                 return result;
             }
             if cnt < result {
                 result = cnt;
             }
             rsgx_sfence();
             let raw_buf = unsafe { slice::from_raw_parts_mut(buf as * mut u8, result as usize) };
             raw_buf.copy_from_slice(plaintext.as_slice());
             result
         }
     } else { -1 }
 }

 #[no_mangle]
 pub extern "C" fn tls_server_write(session_id: usize, buf: * const c_char, cnt: c_int)  -> c_int {
     if let Some(session_ptr) = Sessions::get_session(session_id) {
         let session = unsafe { &mut *(session_ptr) };

         // no buffer, just write_tls.
         if buf.is_null() || cnt == 0 {
             session.do_write();
             return 0;
         }

         rsgx_lfence();
         // cache buffer, waitting for next write_tls
         let cnt = cnt as usize;
         let plaintext = unsafe { slice::from_raw_parts(buf as * mut u8, cnt) };
         let result = session.write(plaintext);

         result
     } else { -1 }
 }

 #[no_mangle]
 pub extern "C" fn tls_server_wants_read(session_id: usize) -> c_int {
     if let Some(session_ptr) = Sessions::get_session(session_id) {
         let session = unsafe { &mut *(session_ptr) };
         let result = session.tls_session.wants_read() as c_int;
         result
     } else { -1 }
 }

 #[no_mangle]
 pub extern "C" fn tls_server_wants_write(session_id: usize)  -> c_int {
     if let Some(session_ptr) = Sessions::get_session(session_id) {
         let session = unsafe { &mut *(session_ptr) };
         let result = session.tls_session.wants_write() as c_int;
         result
     } else { -1 }
 }

 #[no_mangle]
 pub extern "C" fn tls_server_close(session_id: usize) {
     Sessions::remove_session(session_id)
 }

 #[no_mangle]
 pub extern "C" fn tls_server_send_close(session_id: usize) {
     if let Some(session_ptr) = Sessions::get_session(session_id) {
         let session = unsafe { &mut *session_ptr };
         session.tls_session.send_close_notify();
     }
 }
	// Copyright (C) 2017-2019 Baidu, Inc. All Rights Reserved.
	//
	// Redistribution and use in source and binary forms, with or without
	// modification, are permitted provided that the following conditions
	// are met:
	//
	// * Redistributions of source code must retain the above copyright
	// notice, this list of conditions and the following disclaimer.
	// * Redistributions in binary form must reproduce the above copyright
	// notice, this list of conditions and the following disclaimer in
	// the documentation and/or other materials provided with the
	// distribution.
	// * Neither the name of Baidu, Inc., nor the names of its
	// contributors may be used to endorse or promote products derived
	// from this software without specific prior written permission.
	//
	// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

	#![crate_name = "tlsserver"]
	#![crate_type = "staticlib"]

	#![cfg_attr(not(target_env = "sgx"), no_std)]
	#![cfg_attr(target_env = "sgx", feature(rustc_private))]

	extern crate sgx_types;
	extern crate sgx_trts;
	#[cfg(not(target_env = "sgx"))]
	#[macro_use]
	extern crate sgx_tstd as std;

	#[macro_use]
	extern crate lazy_static;

	use sgx_types::*;
	use sgx_trts::trts::{rsgx_raw_is_outside_enclave, rsgx_lfence, rsgx_sfence};

	use std::untrusted::fs;
	use std::io::BufReader;

	use std::ffi::CStr;
	use std::os::raw::c_char;

	use std::vec::Vec;
	use std::boxed::Box;
	use std::io::{Read, Write};
	use std::slice;
	use std::sync::{Arc, SgxRwLock};
	use std::net::TcpStream;
	use std::collections::HashMap;
	use std::sync::atomic::{AtomicUsize, AtomicPtr, Ordering};

	extern crate webpki;
	extern crate rustls;
	use rustls::{Session, NoClientAuth};

	pub struct TlsServer {
	socket: TcpStream,
	tls_session: rustls::ServerSession,
	}

	static GLOBAL_CONTEXT_COUNT: AtomicUsize = AtomicUsize::new(0);

	lazy_static! {
	static ref GLOBAL_CONTEXTS: SgxRwLock<HashMap<usize, AtomicPtr<TlsServer>>> = {
	SgxRwLock::new(HashMap::new())
	};
	}

	impl TlsServer {
	fn new(fd: c_int, cfg: Arc<rustls::ServerConfig>) -> TlsServer {
	TlsServer {
	socket: TcpStream::new(fd).unwrap(),
	tls_session: rustls::ServerSession::new(&cfg)
	}
	}

	fn do_read(&mut self) -> c_int {
	// Read TLS data. This fails if the underlying TCP connection
	// is broken.
	let rc = self.tls_session.read_tls(&mut self.socket);
	if rc.is_err() {
	println!("TLS read error: {:?}", rc);
	return -1;
	}

	// If we're ready but there's no data: EOF.
	if rc.unwrap() == 0 {
	println!("EOF");
	return -1;
	}

	// Reading some TLS data might have yielded new TLS
	// messages to process. Errors from this indicate
	// TLS protocol problems and are fatal.
	let processed = self.tls_session.process_new_packets();
	if processed.is_err() {
	println!("TLS error: {:?}", processed.unwrap_err());
	return -1;
	}
	return 0;
	}

	fn read(&mut self, plaintext: &mut Vec<u8>) -> c_int {
	// Having read some TLS data, and processed any new messages,
	// we might have new plaintext as a result.
	//
	// Read it and then write it to stdout.
	let rc = self.tls_session.read_to_end(plaintext);

	// If that fails, the peer might have started a clean TLS-level
	// session closure.
	if rc.is_err() {
	let err = rc.unwrap_err();
	println!("Plaintext read error: {:?}", err);
	return -1;
	}
	plaintext.len() as c_int
	}

	// fn is_traffic(&self) -> bool {
	// !self.tls_session.is_handshaking()
	// }

	fn write(&mut self, plaintext: &[u8]) -> c_int{
	self.tls_session.write(plaintext).unwrap() as c_int
	}

	fn do_write(&mut self) {
	self.tls_session.write_tls(&mut self.socket).unwrap();
	}
	}

	fn load_certs(filename: &str) -> Vec<rustls::Certificate> {
	let certfile = fs::File::open(filename).expect("cannot open certificate file");
	let mut reader = BufReader::new(certfile);
	rustls::internal::pemfile::certs(&mut reader).unwrap()
	}

	fn load_private_key(filename: &str) -> rustls::PrivateKey {
	let rsa_keys = {
	let keyfile = fs::File::open(filename)
	.expect("cannot open private key file");
	let mut reader = BufReader::new(keyfile);
	rustls::internal::pemfile::rsa_private_keys(&mut reader)
	.expect("file contains invalid rsa private key")
	};

	let pkcs8_keys = {
	let keyfile = fs::File::open(filename)
	.expect("cannot open private key file");
	let mut reader = BufReader::new(keyfile);
	rustls::internal::pemfile::pkcs8_private_keys(&mut reader)
	.expect("file contains invalid pkcs8 private key (encrypted keys not supported)")
	};

	// prefer to load pkcs8 keys
	if !pkcs8_keys.is_empty() {
	pkcs8_keys[0].clone()
	} else {
	assert!(!rsa_keys.is_empty());
	rsa_keys[0].clone()
	}
	}

	fn make_config(cert: &str, key: &str) -> Arc<rustls::ServerConfig> {

	let mut config = rustls::ServerConfig::new(NoClientAuth::new());

	let certs = load_certs(cert);
	let privkey = load_private_key(key);
	config.set_single_cert_with_ocsp_and_sct(certs, privkey, vec![], vec![]).unwrap();

	Arc::new(config)
	}

	struct Sessions;

	impl Sessions {
	fn new_session(svr_ptr : *mut TlsServer) -> Option<usize> {
	match GLOBAL_CONTEXTS.write() {
	Ok(mut gctxts) => {
	let curr_id = GLOBAL_CONTEXT_COUNT.fetch_add(1, Ordering::SeqCst);
	gctxts.insert(curr_id, AtomicPtr::new(svr_ptr));
	Some(curr_id)
	},
	Err(x) => {
	println!("Locking global context SgxRwLock failed! {:?}", x);
	None
	},
	}
	}

	fn get_session(sess_id: size_t) -> Option<*mut TlsServer> {
	match GLOBAL_CONTEXTS.read() {
	Ok(gctxts) => {
	match gctxts.get(&sess_id) {
	Some(s) => {
	Some(s.load(Ordering::SeqCst))
	},
	None => {
	println!("Global contexts cannot find session id = {}", sess_id);
	None
	}
	}
	},
	Err(x) => {
	println!("Locking global context SgxRwLock failed on get_session! {:?}", x);
	None
	},
	}
	}

	fn remove_session(sess_id: size_t) {
	if let Ok(mut gctxts) = GLOBAL_CONTEXTS.write() {
	if let Some(session_ptr) = gctxts.get(&sess_id) {
	let session_ptr = session_ptr.load(Ordering::SeqCst);
	let session = unsafe { &mut *session_ptr };
	let _ = unsafe { Box::<TlsServer>::from_raw(session as *mut _) };
	let _ = gctxts.remove(&sess_id);
	}
	}
	}
	}

	#[no_mangle]
	pub extern "C" fn tls_server_new(fd: c_int, cert: * const c_char, key: * const c_char) -> usize {
	let certfile = unsafe { CStr::from_ptr(cert).to_str() };
	if certfile.is_err() {
	return 0xFFFF_FFFF_FFFF_FFFF;
	}
	let keyfile = unsafe { CStr::from_ptr(key).to_str() };
	if keyfile.is_err() {
	return 0xFFFF_FFFF_FFFF_FFFF;
	}
	let config = make_config(certfile.unwrap(), keyfile.unwrap());

	let p: *mut TlsServer = Box::into_raw(Box::new(TlsServer::new(fd, config)));
	match Sessions::new_session(p) {
	Some(s) => s,
	None => 0xFFFF_FFFF_FFFF_FFFF,
	}
	}

	#[no_mangle]
	pub extern "C" fn tls_server_read(session_id: size_t, buf: * mut c_char, cnt: c_int) -> c_int {
	if let Some(session_ptr) = Sessions::get_session(session_id) {
	let session = unsafe { &mut *(session_ptr) };
	if buf.is_null() \|\| cnt == 0 {
	// just read_tls
	session.do_read()
	} else {
	if !rsgx_raw_is_outside_enclave(buf as * const u8, cnt as usize) {
	return -1;
	}
	// read plain buffer
	let mut plaintext = Vec::new();
	let mut result = session.read(&mut plaintext);
	if result == -1 {
	return result;
	}
	if cnt < result {
	result = cnt;
	}
	rsgx_sfence();
	let raw_buf = unsafe { slice::from_raw_parts_mut(buf as * mut u8, result as usize) };
	raw_buf.copy_from_slice(plaintext.as_slice());
	result
	}
	} else { -1 }
	}

	#[no_mangle]
	pub extern "C" fn tls_server_write(session_id: usize, buf: * const c_char, cnt: c_int) -> c_int {
	if let Some(session_ptr) = Sessions::get_session(session_id) {
	let session = unsafe { &mut *(session_ptr) };

	// no buffer, just write_tls.
	if buf.is_null() \|\| cnt == 0 {
	session.do_write();
	return 0;
	}

	rsgx_lfence();
	// cache buffer, waitting for next write_tls
	let cnt = cnt as usize;
	let plaintext = unsafe { slice::from_raw_parts(buf as * mut u8, cnt) };
	let result = session.write(plaintext);

	result
	} else { -1 }
	}

	#[no_mangle]
	pub extern "C" fn tls_server_wants_read(session_id: usize) -> c_int {
	if let Some(session_ptr) = Sessions::get_session(session_id) {
	let session = unsafe { &mut *(session_ptr) };
	let result = session.tls_session.wants_read() as c_int;
	result
	} else { -1 }
	}

	#[no_mangle]
	pub extern "C" fn tls_server_wants_write(session_id: usize) -> c_int {
	if let Some(session_ptr) = Sessions::get_session(session_id) {
	let session = unsafe { &mut *(session_ptr) };
	let result = session.tls_session.wants_write() as c_int;
	result
	} else { -1 }
	}

	#[no_mangle]
	pub extern "C" fn tls_server_close(session_id: usize) {
	Sessions::remove_session(session_id)
	}

	#[no_mangle]
	pub extern "C" fn tls_server_send_close(session_id: usize) {
	if let Some(session_ptr) = Sessions::get_session(session_id) {
	let session = unsafe { &mut *session_ptr };
	session.tls_session.send_close_notify();
	}
	}