--- /dev/null
+/*
+ * Copyright (c) 2007, Cameron Rich
+ *
+ * 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 the axTLS project 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.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <stdio.h>
+
+#include "ssl.h"
+
+#ifdef CONFIG_SSL_ENABLE_CLIENT /* all commented out if no client */
+
+static int send_client_hello(SSL *ssl);
+static int process_server_hello(SSL *ssl);
+static int process_server_hello_done(SSL *ssl);
+static int send_client_key_xchg(SSL *ssl);
+static int process_cert_req(SSL *ssl);
+static int send_cert_verify(SSL *ssl);
+
+/*
+ * Establish a new SSL connection to an SSL server.
+ */
+EXP_FUNC SSL * STDCALL ssl_client_new(SSL_CTX *ssl_ctx, int client_fd, const
+ uint8_t *session_id, uint8_t sess_id_size)
+{
+ SSL *ssl;
+ int ret;
+
+ SOCKET_BLOCK(client_fd); /* ensure blocking mode */
+ ssl = ssl_new(ssl_ctx, client_fd);
+
+ if (session_id && ssl_ctx->num_sessions)
+ {
+ if (sess_id_size > SSL_SESSION_ID_SIZE) /* validity check */
+ {
+ ssl_free(ssl);
+ return NULL;
+ }
+
+ memcpy(ssl->session_id, session_id, sess_id_size);
+ ssl->sess_id_size = sess_id_size;
+ SET_SSL_FLAG(SSL_SESSION_RESUME); /* just flag for later */
+ }
+
+ SET_SSL_FLAG(SSL_IS_CLIENT);
+ ret = do_client_connect(ssl);
+ return ssl;
+}
+
+/*
+ * Process the handshake record.
+ */
+int do_clnt_handshake(SSL *ssl, int handshake_type, uint8_t *buf, int hs_len)
+{
+ int ret = SSL_OK;
+
+ /* To get here the state must be valid */
+ switch (handshake_type)
+ {
+ case HS_SERVER_HELLO:
+ ret = process_server_hello(ssl);
+ break;
+
+ case HS_CERTIFICATE:
+ ret = process_certificate(ssl, &ssl->x509_ctx);
+ break;
+
+ case HS_SERVER_HELLO_DONE:
+ if ((ret = process_server_hello_done(ssl)) == SSL_OK)
+ {
+ if (IS_SET_SSL_FLAG(SSL_HAS_CERT_REQ))
+ {
+ if ((ret = send_certificate(ssl)) == SSL_OK &&
+ (ret = send_client_key_xchg(ssl)) == SSL_OK)
+ {
+ send_cert_verify(ssl);
+ }
+ }
+ else
+ {
+ ret = send_client_key_xchg(ssl);
+ }
+
+ if (ret == SSL_OK &&
+ (ret = send_change_cipher_spec(ssl)) == SSL_OK)
+ {
+ ret = send_finished(ssl);
+ }
+ }
+ break;
+
+ case HS_CERT_REQ:
+ ret = process_cert_req(ssl);
+ break;
+
+ case HS_FINISHED:
+ ret = process_finished(ssl, hs_len);
+ disposable_free(ssl); /* free up some memory */
+ break;
+
+ case HS_HELLO_REQUEST:
+ disposable_new(ssl);
+ ret = do_client_connect(ssl);
+ break;
+ }
+
+ return ret;
+}
+
+/*
+ * Do the handshaking from the beginning.
+ */
+int do_client_connect(SSL *ssl)
+{
+ int ret = SSL_OK;
+
+ send_client_hello(ssl); /* send the client hello */
+ ssl->bm_read_index = 0;
+ ssl->next_state = HS_SERVER_HELLO;
+ ssl->hs_status = SSL_NOT_OK; /* not connected */
+ x509_free(ssl->x509_ctx);
+
+ /* sit in a loop until it all looks good */
+ while (ssl->hs_status != SSL_OK)
+ {
+ ret = basic_read(ssl, NULL);
+
+ if (ret < SSL_OK)
+ {
+ if (ret != SSL_ERROR_CONN_LOST)
+ {
+ /* let the server know we are dying and why */
+ if (send_alert(ssl, ret))
+ {
+ /* something nasty happened, so get rid of it */
+ kill_ssl_session(ssl->ssl_ctx->ssl_sessions, ssl);
+ }
+ }
+
+ break;
+ }
+ }
+
+ ssl->hs_status = ret; /* connected? */
+ return ret;
+}
+
+/*
+ * Send the initial client hello.
+ */
+static int send_client_hello(SSL *ssl)
+{
+ uint8_t *buf = ssl->bm_data;
+ time_t tm = time(NULL);
+ uint8_t *tm_ptr = &buf[6]; /* time will go here */
+ int i, offset;
+
+ buf[0] = HS_CLIENT_HELLO;
+ buf[1] = 0;
+ buf[2] = 0;
+ /* byte 3 is calculated later */
+ buf[4] = 0x03;
+ buf[5] = 0x01;
+
+ /* client random value - spec says that 1st 4 bytes are big endian time */
+ *tm_ptr++ = (uint8_t)(((long)tm & 0xff000000) >> 24);
+ *tm_ptr++ = (uint8_t)(((long)tm & 0x00ff0000) >> 16);
+ *tm_ptr++ = (uint8_t)(((long)tm & 0x0000ff00) >> 8);
+ *tm_ptr++ = (uint8_t)(((long)tm & 0x000000ff));
+ get_random(SSL_RANDOM_SIZE-4, &buf[10]);
+ memcpy(ssl->dc->client_random, &buf[6], SSL_RANDOM_SIZE);
+ offset = 6 + SSL_RANDOM_SIZE;
+
+ /* give session resumption a go */
+ if (IS_SET_SSL_FLAG(SSL_SESSION_RESUME)) /* set initially by user */
+ {
+ buf[offset++] = ssl->sess_id_size;
+ memcpy(&buf[offset], ssl->session_id, ssl->sess_id_size);
+ offset += ssl->sess_id_size;
+ CLR_SSL_FLAG(SSL_SESSION_RESUME); /* clear so we can set later */
+ }
+ else
+ {
+ /* no session id - because no session resumption just yet */
+ buf[offset++] = 0;
+ }
+
+ buf[offset++] = 0; /* number of ciphers */
+ buf[offset++] = NUM_PROTOCOLS*2;/* number of ciphers */
+
+ /* put all our supported protocols in our request */
+ for (i = 0; i < NUM_PROTOCOLS; i++)
+ {
+ buf[offset++] = 0; /* cipher we are using */
+ buf[offset++] = ssl_prot_prefs[i];
+ }
+
+ buf[offset++] = 1; /* no compression */
+ buf[offset++] = 0;
+ buf[3] = offset - 4; /* handshake size */
+
+ return send_packet(ssl, PT_HANDSHAKE_PROTOCOL, NULL, offset);
+}
+
+/*
+ * Process the server hello.
+ */
+static int process_server_hello(SSL *ssl)
+{
+ uint8_t *buf = ssl->bm_data;
+ int pkt_size = ssl->bm_index;
+ int version = (buf[4] << 4) + buf[5];
+ int num_sessions = ssl->ssl_ctx->num_sessions;
+ uint8_t sess_id_size;
+ int offset, ret = SSL_OK;
+
+ /* check that we are talking to a TLSv1 server */
+ if (version != 0x31)
+ return SSL_ERROR_INVALID_VERSION;
+
+ /* get the server random value */
+ memcpy(ssl->dc->server_random, &buf[6], SSL_RANDOM_SIZE);
+ offset = 6 + SSL_RANDOM_SIZE; /* skip of session id size */
+ sess_id_size = buf[offset++];
+
+ if (num_sessions)
+ {
+ ssl->session = ssl_session_update(num_sessions,
+ ssl->ssl_ctx->ssl_sessions, ssl, &buf[offset]);
+ memcpy(ssl->session->session_id, &buf[offset], sess_id_size);
+
+ /* pad the rest with 0's */
+ if (sess_id_size < SSL_SESSION_ID_SIZE)
+ {
+ memset(&ssl->session->session_id[sess_id_size], 0,
+ SSL_SESSION_ID_SIZE-sess_id_size);
+ }
+ }
+
+ memcpy(ssl->session_id, &buf[offset], sess_id_size);
+ ssl->sess_id_size = sess_id_size;
+ offset += sess_id_size;
+
+ /* get the real cipher we are using */
+ ssl->cipher = buf[++offset];
+ ssl->next_state = IS_SET_SSL_FLAG(SSL_SESSION_RESUME) ?
+ HS_FINISHED : HS_CERTIFICATE;
+
+ offset++; // skip the compr
+ PARANOIA_CHECK(pkt_size, offset);
+ ssl->dc->bm_proc_index = offset+1;
+
+error:
+ return ret;
+}
+
+/**
+ * Process the server hello done message.
+ */
+static int process_server_hello_done(SSL *ssl)
+{
+ ssl->next_state = HS_FINISHED;
+ return SSL_OK;
+}
+
+/*
+ * Send a client key exchange message.
+ */
+static int send_client_key_xchg(SSL *ssl)
+{
+ uint8_t *buf = ssl->bm_data;
+ uint8_t premaster_secret[SSL_SECRET_SIZE];
+ int enc_secret_size = -1;
+
+ buf[0] = HS_CLIENT_KEY_XCHG;
+ buf[1] = 0;
+
+ premaster_secret[0] = 0x03; /* encode the version number */
+ premaster_secret[1] = 0x01;
+ get_random(SSL_SECRET_SIZE-2, &premaster_secret[2]);
+ DISPLAY_RSA(ssl, ssl->x509_ctx->rsa_ctx);
+
+ /* rsa_ctx->bi_ctx is not thread-safe */
+ SSL_CTX_LOCK(ssl->ssl_ctx->mutex);
+ enc_secret_size = RSA_encrypt(ssl->x509_ctx->rsa_ctx, premaster_secret,
+ SSL_SECRET_SIZE, &buf[6], 0);
+ SSL_CTX_UNLOCK(ssl->ssl_ctx->mutex);
+
+ buf[2] = (enc_secret_size + 2) >> 8;
+ buf[3] = (enc_secret_size + 2) & 0xff;
+ buf[4] = enc_secret_size >> 8;
+ buf[5] = enc_secret_size & 0xff;
+
+ generate_master_secret(ssl, premaster_secret);
+ return send_packet(ssl, PT_HANDSHAKE_PROTOCOL, NULL, enc_secret_size+6);
+}
+
+/*
+ * Process the certificate request.
+ */
+static int process_cert_req(SSL *ssl)
+{
+ uint8_t *buf = &ssl->bm_data[ssl->dc->bm_proc_index];
+ int ret = SSL_OK;
+ int offset = (buf[2] << 4) + buf[3];
+ int pkt_size = ssl->bm_index;
+
+ /* don't do any processing - we will send back an RSA certificate anyway */
+ ssl->next_state = HS_SERVER_HELLO_DONE;
+ SET_SSL_FLAG(SSL_HAS_CERT_REQ);
+ ssl->dc->bm_proc_index += offset;
+ PARANOIA_CHECK(pkt_size, offset);
+error:
+ return ret;
+}
+
+/*
+ * Send a certificate verify message.
+ */
+static int send_cert_verify(SSL *ssl)
+{
+ uint8_t *buf = ssl->bm_data;
+ uint8_t dgst[MD5_SIZE+SHA1_SIZE];
+ RSA_CTX *rsa_ctx = ssl->ssl_ctx->rsa_ctx;
+ int n = 0, ret;
+
+ DISPLAY_RSA(ssl, rsa_ctx);
+
+ buf[0] = HS_CERT_VERIFY;
+ buf[1] = 0;
+
+ finished_digest(ssl, NULL, dgst); /* calculate the digest */
+
+ /* rsa_ctx->bi_ctx is not thread-safe */
+ if (rsa_ctx)
+ {
+ SSL_CTX_LOCK(ssl->ssl_ctx->mutex);
+ n = RSA_encrypt(rsa_ctx, dgst, sizeof(dgst), &buf[6], 1);
+ SSL_CTX_UNLOCK(ssl->ssl_ctx->mutex);
+
+ if (n == 0)
+ {
+ ret = SSL_ERROR_INVALID_KEY;
+ goto error;
+ }
+ }
+
+ buf[4] = n >> 8; /* add the RSA size (not officially documented) */
+ buf[5] = n & 0xff;
+ n += 2;
+ buf[2] = n >> 8;
+ buf[3] = n & 0xff;
+ ret = send_packet(ssl, PT_HANDSHAKE_PROTOCOL, NULL, n+4);
+
+error:
+ return ret;
+}
+
+#endif /* CONFIG_SSL_ENABLE_CLIENT */
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