- s2n(0,d);
-
- if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
- ch_len=SSL2_CHALLENGE_LENGTH;
- else
- ch_len=SSL2_MAX_CHALLENGE_LENGTH;
-
- /* write out sslv2 challenge */
- if (SSL3_RANDOM_SIZE < ch_len)
- i=SSL3_RANDOM_SIZE;
- else
- i=ch_len;
- s2n(i,d);
- memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
- RAND_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
- memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
- p+=i;
-
- i= p- &(buf[2]);
- buf[0]=((i>>8)&0xff)|0x80;
- buf[1]=(i&0xff);
-
- s->state=SSL23_ST_CW_CLNT_HELLO_B;
- /* number of bytes to write */
- s->init_num=i+2;
- s->init_off=0;
-
- ssl3_finish_mac(s,&(buf[2]),i);
- }
-
- /* SSL3_ST_CW_CLNT_HELLO_B */
- return(ssl23_write_bytes(s));
- }
+ s2n(0, d);
+
+ 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
+ */
+ if (SSL3_RANDOM_SIZE < ch_len)
+ i = SSL3_RANDOM_SIZE;
+ else
+ i = ch_len;
+ s2n(i, d);
+ memset(&(s->s3->client_random[0]), 0, SSL3_RANDOM_SIZE);
+ if (RAND_pseudo_bytes
+ (&(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i) <= 0)
+ return -1;
+
+ memcpy(p, &(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i);
+ p += i;
+
+ i = p - &(buf[2]);
+ buf[0] = ((i >> 8) & 0xff) | 0x80;
+ buf[1] = (i & 0xff);
+
+ /* number of bytes to write */
+ s->init_num = i + 2;
+ s->init_off = 0;
+
+ ssl3_finish_mac(s, &(buf[2]), i);
+ } else {
+ /* create Client Hello in SSL 3.0/TLS 1.0 format */
+
+ /*
+ * do the record header (5 bytes) and handshake message header (4
+ * bytes) last
+ */
+ d = p = &(buf[9]);
+
+ *(p++) = version_major;
+ *(p++) = version_minor;
+
+ /* Random stuff */
+ memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
+ p += SSL3_RANDOM_SIZE;
+
+ /* Session ID (zero since there is no reuse) */
+ *(p++) = 0;
+
+ /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
+ i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]),
+ ssl3_put_cipher_by_char);
+ if (i == 0) {
+ SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
+ return -1;
+ }
+#ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
+ /*
+ * Some servers hang if client hello > 256 bytes as hack
+ * workaround chop number of supported ciphers to keep it well
+ * below this if we use TLS v1.2
+ */
+ if (TLS1_get_version(s) >= TLS1_2_VERSION
+ && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
+ i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
+#endif
+ s2n(i, p);
+ p += i;
+
+ /* 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;
+}