- {
- BUF_MEM *buf;
- unsigned long Time=(unsigned long)time(NULL);
- void (*cb)(const SSL *ssl,int type,int val)=NULL;
- long num1;
- unsigned long alg_k;
- int ret= -1;
- int new_state,state,skip=0;
-
- RAND_add(&Time,sizeof(Time),0);
- ERR_clear_error();
- clear_sys_error();
-
- if (s->info_callback != NULL)
- cb=s->info_callback;
- else if (s->ctx->info_callback != NULL)
- cb=s->ctx->info_callback;
-
- /* init things to blank */
- s->in_handshake++;
- if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
-
- if (s->cert == NULL)
- {
- SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
- return(-1);
- }
-
- for (;;)
- {
- state=s->state;
-
- switch (s->state)
- {
- case SSL_ST_RENEGOTIATE:
- s->new_session=1;
- /* s->state=SSL_ST_ACCEPT; */
-
- case SSL_ST_BEFORE:
- case SSL_ST_ACCEPT:
- case SSL_ST_BEFORE|SSL_ST_ACCEPT:
- case SSL_ST_OK|SSL_ST_ACCEPT:
-
- s->server=1;
- if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
-
- if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
- {
- SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
- return -1;
- }
- s->type=SSL_ST_ACCEPT;
-
- if (s->init_buf == NULL)
- {
- if ((buf=BUF_MEM_new()) == NULL)
- {
- ret= -1;
- goto end;
- }
- if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
- {
- ret= -1;
- goto end;
- }
- s->init_buf=buf;
- }
-
- if (!ssl3_setup_buffers(s))
- {
- ret= -1;
- goto end;
- }
-
- s->init_num=0;
-
- if (s->state != SSL_ST_RENEGOTIATE)
- {
- /* Ok, we now need to push on a buffering BIO so that
- * the output is sent in a way that TCP likes :-)
- */
- if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
-
- ssl3_init_finished_mac(s);
- s->state=SSL3_ST_SR_CLNT_HELLO_A;
- s->ctx->stats.sess_accept++;
- }
- else
- {
- /* s->state == SSL_ST_RENEGOTIATE,
- * we will just send a HelloRequest */
- s->ctx->stats.sess_accept_renegotiate++;
- s->state=SSL3_ST_SW_HELLO_REQ_A;
- }
-
- break;
-
- case SSL3_ST_SW_HELLO_REQ_A:
- case SSL3_ST_SW_HELLO_REQ_B:
-
- s->shutdown=0;
- dtls1_start_timer(s);
- ret=dtls1_send_hello_request(s);
- if (ret <= 0) goto end;
- s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
- s->state=SSL3_ST_SW_FLUSH;
- s->init_num=0;
-
- ssl3_init_finished_mac(s);
- break;
-
- case SSL3_ST_SW_HELLO_REQ_C:
- s->state=SSL_ST_OK;
- break;
-
- case SSL3_ST_SR_CLNT_HELLO_A:
- case SSL3_ST_SR_CLNT_HELLO_B:
- case SSL3_ST_SR_CLNT_HELLO_C:
-
- s->shutdown=0;
- ret=ssl3_get_client_hello(s);
- if (ret <= 0) goto end;
- dtls1_stop_timer(s);
-
- if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
- s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
- else
- s->state = SSL3_ST_SW_SRVR_HELLO_A;
-
- s->init_num=0;
-
- /* If we're just listening, stop here */
- if (s->d1->listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
- {
- ret = 2;
- s->d1->listen = 0;
- goto end;
- }
-
- break;
-
- case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
- case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
-
- dtls1_start_timer(s);
- ret = dtls1_send_hello_verify_request(s);
- if ( ret <= 0) goto end;
- s->state=SSL3_ST_SW_FLUSH;
- s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
-
- /* HelloVerifyRequest resets Finished MAC */
- if (s->version != DTLS1_BAD_VER)
- ssl3_init_finished_mac(s);
- break;
-
- case SSL3_ST_SW_SRVR_HELLO_A:
- case SSL3_ST_SW_SRVR_HELLO_B:
- s->new_session = 2;
- dtls1_start_timer(s);
- ret=dtls1_send_server_hello(s);
- if (ret <= 0) goto end;
+{
+ BUF_MEM *buf;
+ unsigned long Time = (unsigned long)time(NULL);
+ void (*cb) (const SSL *ssl, int type, int val) = NULL;
+ unsigned long alg_k;
+ int ret = -1;
+ int new_state, state, skip = 0;
+ int listen;
+#ifndef OPENSSL_NO_SCTP
+ unsigned char sctpauthkey[64];
+ char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
+#endif
+
+ RAND_add(&Time, sizeof(Time), 0);
+ ERR_clear_error();
+ clear_sys_error();
+
+ if (s->info_callback != NULL)
+ cb = s->info_callback;
+ else if (s->ctx->info_callback != NULL)
+ cb = s->ctx->info_callback;
+
+ listen = s->d1->listen;
+
+ /* init things to blank */
+ s->in_handshake++;
+ if (!SSL_in_init(s) || SSL_in_before(s))
+ SSL_clear(s);
+
+ s->d1->listen = listen;
+#ifndef OPENSSL_NO_SCTP
+ /*
+ * Notify SCTP BIO socket to enter handshake mode and prevent stream
+ * identifier other than 0. Will be ignored if no SCTP is used.
+ */
+ BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
+ s->in_handshake, NULL);
+#endif
+
+ if (s->cert == NULL) {
+ SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_NO_CERTIFICATE_SET);
+ return (-1);
+ }
+#ifndef OPENSSL_NO_HEARTBEATS
+ /*
+ * If we're awaiting a HeartbeatResponse, pretend we already got and
+ * don't await it anymore, because Heartbeats don't make sense during
+ * handshakes anyway.
+ */
+ if (s->tlsext_hb_pending) {
+ dtls1_stop_timer(s);
+ s->tlsext_hb_pending = 0;
+ s->tlsext_hb_seq++;
+ }
+#endif
+
+ for (;;) {
+ state = s->state;
+
+ switch (s->state) {
+ case SSL_ST_RENEGOTIATE:
+ s->renegotiate = 1;
+ /* s->state=SSL_ST_ACCEPT; */
+
+ case SSL_ST_BEFORE:
+ case SSL_ST_ACCEPT:
+ case SSL_ST_BEFORE | SSL_ST_ACCEPT:
+ case SSL_ST_OK | SSL_ST_ACCEPT:
+
+ s->server = 1;
+ if (cb != NULL)
+ cb(s, SSL_CB_HANDSHAKE_START, 1);
+
+ if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) {
+ SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
+ return -1;
+ }
+ s->type = SSL_ST_ACCEPT;
+
+ if (s->init_buf == NULL) {
+ if ((buf = BUF_MEM_new()) == NULL) {
+ ret = -1;
+ goto end;
+ }
+ if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
+ BUF_MEM_free(buf);
+ ret = -1;
+ goto end;
+ }
+ s->init_buf = buf;
+ }
+
+ if (!ssl3_setup_buffers(s)) {
+ ret = -1;
+ goto end;
+ }
+
+ s->init_num = 0;
+ s->d1->change_cipher_spec_ok = 0;
+ /*
+ * Should have been reset by ssl3_get_finished, too.
+ */
+ s->s3->change_cipher_spec = 0;
+
+ if (s->state != SSL_ST_RENEGOTIATE) {
+ /*
+ * Ok, we now need to push on a buffering BIO so that the
+ * output is sent in a way that TCP likes :-) ...but not with
+ * SCTP :-)
+ */
+#ifndef OPENSSL_NO_SCTP
+ if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
+#endif
+ if (!ssl_init_wbio_buffer(s, 1)) {
+ ret = -1;
+ goto end;
+ }
+
+ ssl3_init_finished_mac(s);
+ s->state = SSL3_ST_SR_CLNT_HELLO_A;
+ s->ctx->stats.sess_accept++;
+ } else {
+ /*
+ * s->state == SSL_ST_RENEGOTIATE, we will just send a
+ * HelloRequest
+ */
+ s->ctx->stats.sess_accept_renegotiate++;
+ s->state = SSL3_ST_SW_HELLO_REQ_A;
+ }
+
+ break;
+
+ case SSL3_ST_SW_HELLO_REQ_A:
+ case SSL3_ST_SW_HELLO_REQ_B:
+
+ s->shutdown = 0;
+ dtls1_clear_record_buffer(s);
+ dtls1_start_timer(s);
+ ret = dtls1_send_hello_request(s);
+ if (ret <= 0)
+ goto end;
+ s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
+ s->state = SSL3_ST_SW_FLUSH;
+ s->init_num = 0;
+
+ ssl3_init_finished_mac(s);
+ break;
+
+ case SSL3_ST_SW_HELLO_REQ_C:
+ s->state = SSL_ST_OK;
+ break;
+
+ case SSL3_ST_SR_CLNT_HELLO_A:
+ case SSL3_ST_SR_CLNT_HELLO_B:
+ case SSL3_ST_SR_CLNT_HELLO_C:
+
+ s->shutdown = 0;
+ ret = ssl3_get_client_hello(s);
+ if (ret <= 0)
+ goto end;
+ dtls1_stop_timer(s);
+
+ if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
+ s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
+ else
+ s->state = SSL3_ST_SW_SRVR_HELLO_A;
+
+ s->init_num = 0;
+
+ /*
+ * Reflect ClientHello sequence to remain stateless while
+ * listening
+ */
+ if (listen) {
+ memcpy(s->s3->write_sequence, s->s3->read_sequence,
+ sizeof(s->s3->write_sequence));
+ }
+
+ /* If we're just listening, stop here */
+ if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) {
+ ret = 2;
+ s->d1->listen = 0;
+ /*
+ * Set expected sequence numbers to continue the handshake.
+ */
+ s->d1->handshake_read_seq = 2;
+ s->d1->handshake_write_seq = 1;
+ s->d1->next_handshake_write_seq = 1;
+ goto end;
+ }
+
+ break;
+
+ case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
+ case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
+
+ ret = dtls1_send_hello_verify_request(s);
+ if (ret <= 0)
+ goto end;
+ s->state = SSL3_ST_SW_FLUSH;
+ s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
+
+ /* HelloVerifyRequest resets Finished MAC */
+ if (s->version != DTLS1_BAD_VER)
+ ssl3_init_finished_mac(s);
+ break;
+
+#ifndef OPENSSL_NO_SCTP
+ case DTLS1_SCTP_ST_SR_READ_SOCK:
+
+ if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
+ s->s3->in_read_app_data = 2;
+ s->rwstate = SSL_READING;
+ BIO_clear_retry_flags(SSL_get_rbio(s));
+ BIO_set_retry_read(SSL_get_rbio(s));
+ ret = -1;
+ goto end;
+ }
+
+ s->state = SSL3_ST_SR_FINISHED_A;
+ break;
+
+ case DTLS1_SCTP_ST_SW_WRITE_SOCK:
+ ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
+ if (ret < 0)
+ goto end;
+
+ if (ret == 0) {
+ if (s->d1->next_state != SSL_ST_OK) {
+ s->s3->in_read_app_data = 2;
+ s->rwstate = SSL_READING;
+ BIO_clear_retry_flags(SSL_get_rbio(s));
+ BIO_set_retry_read(SSL_get_rbio(s));
+ ret = -1;
+ goto end;
+ }
+ }
+
+ s->state = s->d1->next_state;
+ break;
+#endif