+ /* COMPRESSION */
+#ifdef OPENSSL_NO_COMP
+ *(p++) = 1;
+#else
+ if ((s->options & SSL_OP_NO_COMPRESSION)
+ || !s->ctx->comp_methods)
+ j = 0;
+ else
+ j = sk_SSL_COMP_num(s->ctx->comp_methods);
+ *(p++) = 1 + j;
+ for (i = 0; i < j; i++) {
+ comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
+ *(p++) = comp->id;
+ }
+#endif
+ *(p++) = 0; /* Add the NULL method */
+
+#ifndef OPENSSL_NO_TLSEXT
+ /* TLS extensions */
+ if (ssl_prepare_clienthello_tlsext(s) <= 0) {
+ SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
+ return -1;
+ }
+ if ((p =
+ ssl_add_clienthello_tlsext(s, p,
+ buf + SSL3_RT_MAX_PLAIN_LENGTH,
+ &al)) == NULL) {
+ ssl3_send_alert(s, SSL3_AL_FATAL, al);
+ SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
+ return -1;
+ }
+#endif
+
+ l = p - d;
+
+ /* fill in 4-byte handshake header */
+ d = &(buf[5]);
+ *(d++) = SSL3_MT_CLIENT_HELLO;
+ l2n3(l, d);
+
+ l += 4;
+
+ if (l > SSL3_RT_MAX_PLAIN_LENGTH) {
+ SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
+ return -1;
+ }
+
+ /* fill in 5-byte record header */
+ d = buf;
+ *(d++) = SSL3_RT_HANDSHAKE;
+ *(d++) = version_major;
+ /*
+ * Some servers hang if we use long client hellos and a record
+ * number > TLS 1.0.
+ */
+ if (TLS1_get_client_version(s) > TLS1_VERSION)
+ *(d++) = 1;
+ else
+ *(d++) = version_minor;
+ s2n((int)l, d);
+
+ /* number of bytes to write */
+ s->init_num = p - buf;
+ s->init_off = 0;
+
+ ssl3_finish_mac(s, &(buf[5]), s->init_num - 5);
+ }
+
+ s->state = SSL23_ST_CW_CLNT_HELLO_B;
+ s->init_off = 0;
+ }
+
+ /* SSL3_ST_CW_CLNT_HELLO_B */
+ ret = ssl23_write_bytes(s);
+
+ if ((ret >= 2) && s->msg_callback) {
+ /* Client Hello has been sent; tell msg_callback */
+
+ if (ssl2_compat)
+ s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data + 2,
+ ret - 2, s, s->msg_callback_arg);
+ else {
+ s->msg_callback(1, version, SSL3_RT_HEADER, s->init_buf->data, 5,
+ s, s->msg_callback_arg);
+ s->msg_callback(1, version, SSL3_RT_HANDSHAKE,
+ s->init_buf->data + 5, ret - 5, s,
+ s->msg_callback_arg);
+ }
+ }
+
+ return ret;
+}
+
+static int ssl23_get_server_hello(SSL *s)
+{
+ char buf[8];
+ unsigned char *p;
+ int i;
+ int n;
+
+ n = ssl23_read_bytes(s, 7);
+
+ if (n != 7)
+ return (n);
+ p = s->packet;
+
+ memcpy(buf, p, n);
+
+ if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
+ (p[5] == 0x00) && (p[6] == 0x02)) {
+#ifdef OPENSSL_NO_SSL2
+ SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
+ goto err;
+#else
+ /* we are talking sslv2 */
+ /*
+ * we need to clean up the SSLv3 setup and put in the sslv2 stuff.
+ */
+ int ch_len;
+
+ if (s->options & SSL_OP_NO_SSLv2) {
+ SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
+ goto err;
+ }
+ if (s->s2 == NULL) {
+ if (!ssl2_new(s))
+ goto err;
+ } else
+ ssl2_clear(s);
+
+ if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
+ ch_len = SSL2_CHALLENGE_LENGTH;
+ else
+ ch_len = SSL2_MAX_CHALLENGE_LENGTH;
+
+ /* write out sslv2 challenge */
+ /*
+ * Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because it is
+ * one of SSL2_MAX_CHALLENGE_LENGTH (32) or SSL2_MAX_CHALLENGE_LENGTH
+ * (16), but leave the check in for futurproofing
+ */
+ i = (SSL3_RANDOM_SIZE < ch_len)
+ ? SSL3_RANDOM_SIZE : ch_len;
+ s->s2->challenge_length = i;
+ memcpy(s->s2->challenge,
+ &(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i);
+
+ if (s->s3 != NULL)
+ ssl3_free(s);
+
+ if (!BUF_MEM_grow_clean(s->init_buf,
+ SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) {
+ SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, ERR_R_BUF_LIB);
+ goto err;
+ }
+
+ s->state = SSL2_ST_GET_SERVER_HELLO_A;
+ if (!(s->client_version == SSL2_VERSION))
+ /*
+ * use special padding (SSL 3.0 draft/RFC 2246, App. E.2)
+ */
+ s->s2->ssl2_rollback = 1;
+
+ /*
+ * setup the 7 bytes we have read so we get them from the sslv2
+ * buffer
+ */
+ s->rstate = SSL_ST_READ_HEADER;
+ s->packet_length = n;
+ s->packet = &(s->s2->rbuf[0]);
+ memcpy(s->packet, buf, n);
+ s->s2->rbuf_left = n;
+ s->s2->rbuf_offs = 0;
+
+ /* we have already written one */
+ s->s2->write_sequence = 1;
+
+ s->method = SSLv2_client_method();
+ s->handshake_func = s->method->ssl_connect;
+#endif
+ } else if (p[1] == SSL3_VERSION_MAJOR &&
+ p[2] <= TLS1_2_VERSION_MINOR &&
+ ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) ||
+ (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2))) {
+ /* we have sslv3 or tls1 (server hello or alert) */
+
+#ifndef OPENSSL_NO_SSL3
+ if ((p[2] == SSL3_VERSION_MINOR) && !(s->options & SSL_OP_NO_SSLv3)) {
+# ifdef OPENSSL_FIPS
+ if (FIPS_mode()) {
+ SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,
+ SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
+ goto err;
+ }
+# endif
+ s->version = SSL3_VERSION;
+ s->method = SSLv3_client_method();
+ } else
+#endif
+ if ((p[2] == TLS1_VERSION_MINOR) && !(s->options & SSL_OP_NO_TLSv1)) {
+ s->version = TLS1_VERSION;
+ s->method = TLSv1_client_method();
+ } else if ((p[2] == TLS1_1_VERSION_MINOR) &&
+ !(s->options & SSL_OP_NO_TLSv1_1)) {
+ s->version = TLS1_1_VERSION;
+ s->method = TLSv1_1_client_method();
+ } else if ((p[2] == TLS1_2_VERSION_MINOR) &&
+ !(s->options & SSL_OP_NO_TLSv1_2)) {
+ s->version = TLS1_2_VERSION;
+ s->method = TLSv1_2_client_method();
+ } else {
+ SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
+ goto err;
+ }
+
+ /* ensure that TLS_MAX_VERSION is up-to-date */
+ OPENSSL_assert(s->version <= TLS_MAX_VERSION);
+
+ if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING) {
+ /* fatal alert */
+
+ void (*cb) (const SSL *ssl, int type, int val) = NULL;
+ int j;
+
+ if (s->info_callback != NULL)
+ cb = s->info_callback;
+ else if (s->ctx->info_callback != NULL)
+ cb = s->ctx->info_callback;
+
+ i = p[5];
+ if (cb != NULL) {
+ j = (i << 8) | p[6];
+ cb(s, SSL_CB_READ_ALERT, j);
+ }
+
+ if (s->msg_callback) {
+ s->msg_callback(0, s->version, SSL3_RT_HEADER, p, 5, s,
+ s->msg_callback_arg);
+ s->msg_callback(0, s->version, SSL3_RT_ALERT, p + 5, 2, s,
+ s->msg_callback_arg);
+ }
+
+ s->rwstate = SSL_NOTHING;
+ SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_AD_REASON_OFFSET + p[6]);
+ goto err;
+ }
+
+ if (!ssl_init_wbio_buffer(s, 1))
+ goto err;
+
+ /* we are in this state */
+ s->state = SSL3_ST_CR_SRVR_HELLO_A;
+
+ /*
+ * put the 7 bytes we have read into the input buffer for SSLv3
+ */
+ s->rstate = SSL_ST_READ_HEADER;
+ s->packet_length = n;
+ if (s->s3->rbuf.buf == NULL)
+ if (!ssl3_setup_read_buffer(s))
+ goto err;
+ s->packet = &(s->s3->rbuf.buf[0]);
+ memcpy(s->packet, buf, n);
+ s->s3->rbuf.left = n;
+ s->s3->rbuf.offset = 0;
+
+ s->handshake_func = s->method->ssl_connect;
+ } else {
+ SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNKNOWN_PROTOCOL);
+ goto err;
+ }
+ s->init_num = 0;
+
+ return (SSL_connect(s));
+ err:
+ return (-1);
+}