WIP: TLS support

3 files changed, 139 insertions, 8 deletions

diff --git a/include/salticidae/conn.h b/include/salticidae/conn.h
index 48902d4..076d64a 100644
--- a/include/salticidae/conn.h
+++ b/include/salticidae/conn.h
@@ -88,9 +88,20 @@ class ConnPool {
         TimerEvent ev_send_wait;
         /** does not need to wait if true */
         bool ready_send;
+
+        typedef void (socket_io_func)(const conn_t &, int, int);
+        socket_io_func *send_data_func;
+        socket_io_func *recv_data_func;
+        BoxObj<TLS> tls;
     
-        void recv_data(int, int);
-        void send_data(int, int);
+        static socket_io_func _recv_data;
+        static socket_io_func _send_data;
+
+        static socket_io_func _recv_data_tls;
+        static socket_io_func _send_data_tls;
+        static socket_io_func _recv_data_tls_handshake;
+        static socket_io_func _send_data_tls_handshake;
+
         void conn_server(int, int);
 
         /** Terminate the connection (from the worker thread). */
@@ -99,7 +110,7 @@ class ConnPool {
         void disp_terminate();
 
         public:
-        Conn(): ready_send(false) {}
+        Conn(): ready_send(false), send_data_func(nullptr), recv_data_func(nullptr) {}
         Conn(const Conn &) = delete;
         Conn(Conn &&other) = delete;
     
@@ -158,6 +169,8 @@ class ConnPool {
     const double conn_server_timeout;
     const size_t seg_buff_size;
     const size_t queue_capacity;
+    const bool enable_tls;
+    tls_context_t tls_ctx;
 
     /* owned by user loop */
     protected:
@@ -212,6 +225,21 @@ class ConnPool {
                             std::this_thread::get_id());
                         return;
                     }
+                    auto cpool = conn->cpool;
+                    if (cpool->enable_tls)
+                    {
+                        conn->tls = new TLS(
+                                cpool->tls_ctx, client_fd,
+                                conn->mode == Conn::ConnMode::PASSIVE);
+                        conn->send_data_func = Conn::_send_data_tls_handshake;
+                        conn->recv_data_func = Conn::_recv_data_tls_handshake;
+                    }
+                    else
+                    {
+                        conn->send_data_func = Conn::_send_data;
+                        conn->recv_data_func = Conn::_recv_data;
+                        cpool->update_conn(conn, true);
+                    }
                     assert(conn->fd != -1);
                     SALTICIDAE_LOG_INFO("worker %x got %s",
                             std::this_thread::get_id(),
@@ -224,16 +252,16 @@ class ConnPool {
                         {
                             conn->ev_socket.del();
                             conn->ev_socket.add(FdEvent::READ | FdEvent::WRITE);
-                            conn->send_data(client_fd, FdEvent::WRITE);
+                            conn->send_data_func(conn, client_fd, FdEvent::WRITE);
                         }
                         return false;
                     });
                     conn->ev_socket = FdEvent(ec, client_fd, [this, conn=conn](int fd, int what) {
                         try {
                             if (what & FdEvent::READ)
-                                conn->recv_data(fd, what);
+                                conn->recv_data_func(conn, fd, what);
                             else
-                                conn->send_data(fd, what);
+                                conn->send_data_func(conn, fd, what);
                         } catch (...) { on_fatal_error(std::current_exception()); }
                     });
                     conn->ev_socket.add(FdEvent::READ | FdEvent::WRITE);
@@ -301,6 +329,9 @@ class ConnPool {
         size_t _seg_buff_size;
         size_t _nworker;
         size_t _queue_capacity;
+        bool _enable_tls;
+        std::string _tls_cert_file;
+        std::string _tls_key_file;
 
         public:
         Config():
@@ -308,7 +339,10 @@ class ConnPool {
             _conn_server_timeout(2),
             _seg_buff_size(4096),
             _nworker(1),
-            _queue_capacity(0) {}
+            _queue_capacity(0),
+            _enable_tls(true),
+            _tls_cert_file("./server.pem"),
+            _tls_key_file("./server.pem") {}
 
         Config &max_listen_backlog(int x) {
             _max_listen_backlog = x;
@@ -334,6 +368,11 @@ class ConnPool {
             _queue_capacity = x;
             return *this;
         }
+
+        Config &enable_tls(bool x) {
+            _enable_tls = x;
+            return *this;
+        }
     };
 
     ConnPool(const EventContext &ec, const Config &config):
@@ -342,9 +381,19 @@ class ConnPool {
             conn_server_timeout(config._conn_server_timeout),
             seg_buff_size(config._seg_buff_size),
             queue_capacity(config._queue_capacity),
+            enable_tls(config._enable_tls),
+            tls_ctx(nullptr),
             listen_fd(-1),
             nworker(config._nworker),
             system_state(0) {
+        if (enable_tls)
+        {
+            tls_ctx = new TLSContext();
+            tls_ctx->use_cert_file(config._tls_cert_file);
+            tls_ctx->use_priv_key_file(config._tls_key_file);
+            if (!tls_ctx->check_priv_key())
+                throw SalticidaeError(SALTI_ERROR_TLS_GENERIC_ERROR);
+        }
         workers = new Worker[nworker];
         user_tcall = new ThreadCall(ec);
         disp_ec = workers[0].get_ec();
@@ -353,7 +402,8 @@ class ConnPool {
         disp_error_cb = [this](const std::exception_ptr err) {
             user_tcall->async_call([this, err](ThreadCall::Handle &) {
                 stop_workers();
-                if (error_cb) error_cb(err, true);
+                std::rethrow_exception(err);
+                //if (error_cb) error_cb(err, true);
             });
             disp_ec.stop();
             workers[0].stop_tcall();
diff --git a/include/salticidae/crypto.h b/include/salticidae/crypto.h
index 772cce1..1e6daa1 100644
--- a/include/salticidae/crypto.h
+++ b/include/salticidae/crypto.h
@@ -26,7 +26,9 @@
 #define _SALTICIDAE_CRYPTO_H
 
 #include "salticidae/type.h"
+#include "salticidae/util.h"
 #include <openssl/sha.h>
+#include <openssl/ssl.h>
 
 namespace salticidae {
 
@@ -114,6 +116,82 @@ class SHA1 {
     }
 };
 
+class TLSContext {
+    SSL_CTX *ctx;
+    friend class TLS;
+    public:
+    static void init_tls() { SSL_library_init(); }
+    TLSContext(): ctx(SSL_CTX_new(TLS_method())) {
+        if (ctx == nullptr)
+            throw std::runtime_error("TLSContext init error");
+    }
+
+    void use_cert_file(const std::string &fname) {
+        auto ret = SSL_CTX_use_certificate_file(ctx, fname.c_str(), SSL_FILETYPE_PEM);
+        if (ret <= 0)
+            throw SalticidaeError(SALTI_ERROR_TLS_CERT_ERROR);
+    }
+
+    void use_priv_key_file(const std::string &fname) {
+        auto ret = SSL_CTX_use_PrivateKey_file(ctx, fname.c_str(), SSL_FILETYPE_PEM);
+        if (ret <= 0)
+            throw SalticidaeError(SALTI_ERROR_TLS_KEY_ERROR);
+    }
+
+    bool check_priv_key() {
+        return SSL_CTX_check_private_key(ctx) > 0;
+    }
+
+    ~TLSContext() { SSL_CTX_free(ctx); }
+};
+
+using tls_context_t = ArcObj<TLSContext>;
+
+class TLS {
+    SSL *ssl;
+    public:
+    TLS(const tls_context_t &ctx, int fd, bool accept): ssl(SSL_new(ctx->ctx)) {
+        if (ssl == nullptr)
+            throw std::runtime_error("TLS init error");
+        if (!SSL_set_fd(ssl, fd))
+            throw SalticidaeError(SALTI_ERROR_TLS_GENERIC_ERROR);
+        if (accept)
+            SSL_set_accept_state(ssl);
+        else
+            SSL_set_connect_state(ssl);
+    }
+
+    bool do_handshake(int &want_io_type) { /* 0 for read, 1 for write */
+        auto ret = SSL_do_handshake(ssl);
+        if (ret == 1) return true;
+        auto err = SSL_get_error(ssl, ret);
+        if (err == SSL_ERROR_WANT_WRITE)
+            want_io_type = 1;
+        else if (err == SSL_ERROR_WANT_READ)
+            want_io_type = 0;
+        else
+            throw SalticidaeError(SALTI_ERROR_TLS_GENERIC_ERROR);
+        return false;
+    }
+
+    inline int send(const void *buff, size_t size) {
+        return SSL_write(ssl, buff, size);
+    }
+
+    inline int recv(void *buff, size_t size) {
+        return SSL_read(ssl, buff, size);
+    }
+
+    int get_error(int ret) {
+        return SSL_get_error(ssl, ret);
+    }
+
+    ~TLS() {
+        SSL_shutdown(ssl);
+        SSL_free(ssl);
+    }
+};
+
 }
 
 #endif
diff --git a/include/salticidae/util.h b/include/salticidae/util.h
index 007fcc4..320c78f 100644
--- a/include/salticidae/util.h
+++ b/include/salticidae/util.h
@@ -83,6 +83,9 @@ enum SalticidaeErrorCode {
     SALTI_ERROR_OPT_UNKNOWN_ACTION,
     SALTI_ERROR_CONFIG_LINE_TOO_LONG,
     SALTI_ERROR_OPT_INVALID,
+    SALTI_ERROR_TLS_CERT_ERROR,
+    SALTI_ERROR_TLS_KEY_ERROR,
+    SALTI_ERROR_TLS_GENERIC_ERROR,
     SALTI_ERROR_UNKNOWN
 };