Move in_handshake into STATEM

The SSL variable |in_handshake| seems misplaced. It would be better to have
it in the STATEM structure.
Reviewed-by: NTim Hudson <tjh@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>

ssl/d1_lib.c

@@ -1017,7 +1017,7 @@ int dtls1_heartbeat(SSL *s)
     }
 
     /* ...and no handshake in progress. */
-    if (SSL_in_init(s) || s->in_handshake) {
+    if (SSL_in_init(s) || ossl_statem_get_in_handshake(s)) {
         SSLerr(SSL_F_DTLS1_HEARTBEAT, SSL_R_UNEXPECTED_MESSAGE);
         return -1;
     }

ssl/d1_msg.c

@@ -125,11 +125,11 @@ int dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len)
      * Check if we have to continue an interrupted handshake for reading
      * belated app data with SCTP.
      */
-    if ((SSL_in_init(s) && !s->in_handshake) ||
+    if ((SSL_in_init(s) && !ossl_statem_get_in_handshake(s)) ||
         (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
          ossl_statem_in_sctp_read_sock(s)))
 #else
-    if (SSL_in_init(s) && !s->in_handshake)
+    if (SSL_in_init(s) && !ossl_statem_get_in_handshake(s))
 #endif
     {
         i = s->handshake_func(s);

ssl/record/rec_layer_d1.c

@@ -439,12 +439,12 @@ int dtls1_read_bytes(SSL *s, int type, int *recvd_type, unsigned char *buf,
      * Continue handshake if it had to be interrupted to read app data with
      * SCTP.
      */
-    if ((!s->in_handshake && SSL_in_init(s)) ||
+    if ((!ossl_statem_get_in_handshake(s) && SSL_in_init(s)) ||
         (BIO_dgram_is_sctp(SSL_get_rbio(s))
          && ossl_statem_in_sctp_read_sock(s)
          && s->s3->in_read_app_data != 2))
 #else
-    if (!s->in_handshake && SSL_in_init(s))
+    if (!ossl_statem_get_in_handshake(s) && SSL_in_init(s))
 #endif
     {
         /* type == SSL3_RT_APPLICATION_DATA */
@@ -878,7 +878,7 @@ int dtls1_read_bytes(SSL *s, int type, int *recvd_type, unsigned char *buf,
      * Unexpected handshake message (Client Hello, or protocol violation)
      */
     if ((s->rlayer.d->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
-        !s->in_handshake) {
+        !ossl_statem_get_in_handshake(s)) {
         struct hm_header_st msg_hdr;
 
         /* this may just be a stale retransmit */
@@ -950,8 +950,8 @@ int dtls1_read_bytes(SSL *s, int type, int *recvd_type, unsigned char *buf,
     case SSL3_RT_HANDSHAKE:
         /*
          * we already handled all of these, with the possible exception of
-         * SSL3_RT_HANDSHAKE when s->in_handshake is set, but that should not
-         * happen when type != rr->type
+         * SSL3_RT_HANDSHAKE when ossl_statem_get_in_handshake(s) is true, but
+         * that should not happen when type != rr->type
          */
         al = SSL_AD_UNEXPECTED_MESSAGE;
         SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);

ssl/record/rec_layer_s3.c

@@ -459,7 +459,7 @@ int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
     tot = s->rlayer.wnum;
     s->rlayer.wnum = 0;
 
-    if (SSL_in_init(s) && !s->in_handshake) {
+    if (SSL_in_init(s) && !ossl_statem_get_in_handshake(s)) {
         i = s->handshake_func(s);
         if (i < 0)
             return (i);
@@ -1025,7 +1025,7 @@ int ssl3_read_bytes(SSL *s, int type, int *recvd_type, unsigned char *buf,
      * Now s->rlayer.handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE.
      */
 
-    if (!s->in_handshake && SSL_in_init(s)) {
+    if (!ossl_statem_get_in_handshake(s) && SSL_in_init(s)) {
         /* type == SSL3_RT_APPLICATION_DATA */
         i = s->handshake_func(s);
         if (i < 0)
@@ -1383,7 +1383,8 @@ int ssl3_read_bytes(SSL *s, int type, int *recvd_type, unsigned char *buf,
     /*
      * Unexpected handshake message (Client Hello, or protocol violation)
      */
-    if ((s->rlayer.handshake_fragment_len >= 4) && !s->in_handshake) {
+    if ((s->rlayer.handshake_fragment_len >= 4)
+            && !ossl_statem_get_in_handshake(s)) {
         if (SSL_is_init_finished(s) &&
             !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) {
             ossl_statem_set_in_init(s, 1);
@@ -1436,8 +1437,8 @@ int ssl3_read_bytes(SSL *s, int type, int *recvd_type, unsigned char *buf,
     case SSL3_RT_HANDSHAKE:
         /*
          * we already handled all of these, with the possible exception of
-         * SSL3_RT_HANDSHAKE when s->in_handshake is set, but that should not
-         * happen when type != rr->type
+         * SSL3_RT_HANDSHAKE when ossl_statem_get_in_handshake(s) is true, but
+         * that should not happen when type != rr->type
          */
         al = SSL_AD_UNEXPECTED_MESSAGE;
         SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR);

ssl/record/ssl3_record.c

@@ -1528,7 +1528,7 @@ int dtls1_get_record(SSL *s)
      * processed at this time.
      */
     if (is_next_epoch) {
-        if ((SSL_in_init(s) || s->in_handshake)) {
+        if ((SSL_in_init(s) || ossl_statem_get_in_handshake(s))) {
             if (dtls1_buffer_record
                 (s, &(DTLS_RECORD_LAYER_get_unprocessed_rcds(&s->rlayer)),
                 rr->seq_num) < 0)

ssl/s3_lib.c

@@ -5085,11 +5085,11 @@ static int ssl3_read_internal(SSL *s, void *buf, int len, int peek)
          * makes sense here; so disable handshake processing and try to read
          * application data again.
          */
-        s->in_handshake++;
+        ossl_statem_set_in_handshake(s, 1);
         ret =
             s->method->ssl_read_bytes(s, SSL3_RT_APPLICATION_DATA, NULL, buf,
                                       len, peek);
-        s->in_handshake--;
+        ossl_statem_set_in_handshake(s, 0);
     } else
         s->s3->in_read_app_data = 0;
 

ssl/ssl_lib.c

@@ -230,7 +230,7 @@ int SSL_clear(SSL *s)
      * Check to see if we were changed into a different method, if so, revert
      * back if we are not doing session-id reuse.
      */
-    if (!s->in_handshake && (s->session == NULL)
+    if (!ossl_statem_get_in_handshake(s) && (s->session == NULL)
         && (s->method != s->ctx->method)) {
         s->method->ssl_free(s);
         s->method = s->ctx->method;
@@ -1080,7 +1080,7 @@ long SSL_ctrl(SSL *s, int cmd, long larg, void *parg)
             return TLS_CIPHER_LEN;
         }
     case SSL_CTRL_GET_EXTMS_SUPPORT:
-        if (!s->session || SSL_in_init(s) || s->in_handshake)
+        if (!s->session || SSL_in_init(s) || ossl_statem_get_in_handshake(s))
 		return -1;
 	if (s->session->flags & SSL_SESS_FLAG_EXTMS)
             return 1;
@@ -2526,7 +2526,6 @@ SSL *SSL_dup(SSL *s)
             ret->wbio = ret->rbio;
     }
     ret->rwstate = s->rwstate;
-    ret->in_handshake = s->in_handshake;
     ret->handshake_func = s->handshake_func;
     ret->server = s->server;
     ret->renegotiate = s->renegotiate;

ssl/ssl_locl.h

@@ -986,8 +986,7 @@ struct ssl_st {
      * request needs re-doing when in SSL_accept or SSL_connect
      */
     int rwstate;
-    /* true when we are actually in SSL_accept() or SSL_connect() */
-    int in_handshake;
+
     int (*handshake_func) (SSL *);
     /*
      * Imagine that here's a boolean member "init" that is switched as soon

ssl/statem/statem.c

@@ -187,6 +187,19 @@ void ossl_statem_set_in_init(SSL *s, int init)
     s->statem.in_init = init;
 }
 
+int ossl_statem_get_in_handshake(SSL *s)
+{
+    return s->statem.in_handshake;
+}
+
+void ossl_statem_set_in_handshake(SSL *s, int inhand)
+{
+    if (inhand)
+        s->statem.in_handshake++;
+    else
+        s->statem.in_handshake--;
+}
+
 void ossl_statem_set_hello_verify_done(SSL *s)
 {
     s->statem.state = MSG_FLOW_UNINITED;
@@ -267,7 +280,7 @@ static int state_machine(SSL *s, int server) {
 
     cb = get_callback(s);
 
-    s->in_handshake++;
+    st->in_handshake++;
     if (!SSL_in_init(s) || SSL_in_before(s)) {
         if (!SSL_clear(s))
             return -1;
@@ -280,7 +293,7 @@ static int state_machine(SSL *s, int server) {
          * 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);
+                 st->in_handshake, NULL);
     }
 #endif
 
@@ -447,7 +460,7 @@ static int state_machine(SSL *s, int server) {
     ret = 1;
 
  end:
-    s->in_handshake--;
+    st->in_handshake--;
 
 #ifndef OPENSSL_NO_SCTP
     if (SSL_IS_DTLS(s)) {
@@ -456,7 +469,7 @@ static int state_machine(SSL *s, int server) {
          * 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);
+                 st->in_handshake, NULL);
     }
 #endif
 

ssl/statem/statem.h

@@ -136,6 +136,9 @@ struct ossl_statem_st {
     int in_init;
     int read_state_first_init;
 
+    /* true when we are actually in SSL_accept() or SSL_connect() */
+    int in_handshake;
+
     /* Should we skip the CertificateVerify message? */
     unsigned int no_cert_verify;
 
@@ -161,6 +164,8 @@ void ossl_statem_set_renegotiate(SSL *s);
 void ossl_statem_set_error(SSL *s);
 int ossl_statem_in_error(const SSL *s);
 void ossl_statem_set_in_init(SSL *s, int init);
+int ossl_statem_get_in_handshake(SSL *s);
+void ossl_statem_set_in_handshake(SSL *s, int inhand);
 void ossl_statem_set_hello_verify_done(SSL *s);
 __owur int ossl_statem_app_data_allowed(SSL *s);
 #ifndef OPENSSL_NO_SCTP

ssl/t1_lib.c

@@ -3680,7 +3680,7 @@ int tls1_heartbeat(SSL *s)
     }
 
     /* ...and no handshake in progress. */
-    if (SSL_in_init(s) || s->in_handshake) {
+    if (SSL_in_init(s) || ossl_statem_get_in_handshake(s)) {
         SSLerr(SSL_F_TLS1_HEARTBEAT, SSL_R_UNEXPECTED_MESSAGE);
         return -1;
     }