Fix KTLS with BIO_new_connect

When a socket connection is done using BIO_new_connect,
the ktls_enable is done too early, and fails with ENOTCONN.
Therefore the KLTS ioctl will fail later with ENOPROTOOPT.
Fix that by doing the ktls_enable after the connection
succeeded, not when the socket is created as that will
always fail.

One example where this happens is doit_localhost in
test/ssl_old_test.c, and therefore, contrary to the expectation
the -client_ktls option did never enable the client KTLS
connection, but this was not noticed, because there was no
diagnostic output, and it was only visible with strace output.

Also enhanced the ssl_old_test -client_ktls/-server_ktls
options together with -v option to print a summary line
if and how KTLS was negotiated in server and client.

While I am already there adjusted the usage info of
the -s_cert, -s_key commands, and allow -time to print the
timings of ktls connections.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18318)

(cherry picked from commit 598bd7741568a1aae678e5472f18aae1ab991e8d)

4 files changed, 49 insertions, 21 deletions

diff --git a/crypto/bio/bio_sock.c b/crypto/bio/bio_sock.c
index b827c5b902..2a50ce55d1 100644
--- a/crypto/bio/bio_sock.c
+++ b/crypto/bio/bio_sock.c
@@ -400,7 +400,7 @@ int BIO_socket_wait(int fd, int for_read, time_t max_time)
         return 1;
 
     now = time(NULL);
-    if (max_time <= now)
+    if (max_time < now)
         return 0;
 
     FD_ZERO(&confds);
diff --git a/crypto/bio/bio_sock2.c b/crypto/bio/bio_sock2.c
index b6c95913ce..d1a44169bd 100644
--- a/crypto/bio/bio_sock2.c
+++ b/crypto/bio/bio_sock2.c
@@ -52,17 +52,6 @@ int BIO_socket(int domain, int socktype, int protocol, int options)
         ERR_raise(ERR_LIB_BIO, BIO_R_UNABLE_TO_CREATE_SOCKET);
         return INVALID_SOCKET;
     }
-# ifndef OPENSSL_NO_KTLS
-    {
-        /*
-         * The new socket is created successfully regardless of ktls_enable.
-         * ktls_enable doesn't change any functionality of the socket, except
-         * changing the setsockopt to enable the processing of ktls_start.
-         * Thus, it is not a problem to call it for non-TLS sockets.
-         */
-        ktls_enable(sock);
-    }
-# endif
 
     return sock;
 }
@@ -128,6 +117,15 @@ int BIO_connect(int sock, const BIO_ADDR *addr, int options)
         }
         return 0;
     }
+# ifndef OPENSSL_NO_KTLS
+    /*
+     * The new socket is created successfully regardless of ktls_enable.
+     * ktls_enable doesn't change any functionality of the socket, except
+     * changing the setsockopt to enable the processing of ktls_start.
+     * Thus, it is not a problem to call it for non-TLS sockets.
+     */
+    ktls_enable(sock);
+# endif
     return 1;
 }
 
diff --git a/crypto/bio/bss_conn.c b/crypto/bio/bss_conn.c
index d146c97b82..e71c05f96c 100644
--- a/crypto/bio/bss_conn.c
+++ b/crypto/bio/bss_conn.c
@@ -188,6 +188,9 @@ static int conn_state(BIO *b, BIO_CONNECT *c)
             break;
 
         case BIO_CONN_S_BLOCKED_CONNECT:
+            /* wait for socket being writable, before querying BIO_sock_error */
+            if (BIO_socket_wait(b->num, 0, time(NULL)) == 0)
+                break;
             i = BIO_sock_error(b->num);
             if (i != 0) {
                 BIO_clear_retry_flags(b);
@@ -205,8 +208,18 @@ static int conn_state(BIO *b, BIO_CONNECT *c)
                 ERR_raise(ERR_LIB_BIO, BIO_R_NBIO_CONNECT_ERROR);
                 ret = 0;
                 goto exit_loop;
-            } else
+            } else {
                 c->state = BIO_CONN_S_OK;
+# ifndef OPENSSL_NO_KTLS
+                /*
+                 * The new socket is created successfully regardless of ktls_enable.
+                 * ktls_enable doesn't change any functionality of the socket, except
+                 * changing the setsockopt to enable the processing of ktls_start.
+                 * Thus, it is not a problem to call it for non-TLS sockets.
+                 */
+                ktls_enable(b->num);
+# endif
+            }
             break;
 
         case BIO_CONN_S_CONNECT_ERROR:
diff --git a/test/ssl_old_test.c b/test/ssl_old_test.c
index 5fb54a3a2e..94f0aa7c67 100644
--- a/test/ssl_old_test.c
+++ b/test/ssl_old_test.c
@@ -666,9 +666,9 @@ static void sv_usage(void)
 #endif
     fprintf(stderr, " -CApath arg   - PEM format directory of CA's\n");
     fprintf(stderr, " -CAfile arg   - PEM format file of CA's\n");
-    fprintf(stderr, " -cert arg     - Server certificate file\n");
+    fprintf(stderr, " -s_cert arg   - Server certificate file\n");
     fprintf(stderr,
-            " -key arg      - Server key file (default: same as -cert)\n");
+            " -s_key arg    - Server key file (default: same as -cert)\n");
     fprintf(stderr, " -c_cert arg   - Client certificate file\n");
     fprintf(stderr,
             " -c_key arg    - Client key file (default: same as -c_cert)\n");
@@ -1296,7 +1296,7 @@ int main(int argc, char *argv[])
     }
 
     if (print_time) {
-        if (bio_type != BIO_PAIR) {
+        if (bio_type == BIO_MEM) {
             fprintf(stderr, "Using BIO pair (-bio_pair)\n");
             bio_type = BIO_PAIR;
         }
@@ -2024,7 +2024,7 @@ int doit_localhost(SSL *s_ssl, SSL *c_ssl, int family, long count,
                 r = BIO_write(c_ssl_bio, cbuf, i);
                 if (r < 0) {
                     if (!BIO_should_retry(c_ssl_bio)) {
-                        fprintf(stderr, "ERROR in CLIENT\n");
+                        fprintf(stderr, "ERROR in CLIENT (write)\n");
                         err_in_client = 1;
                         goto err;
                     }
@@ -2050,7 +2050,7 @@ int doit_localhost(SSL *s_ssl, SSL *c_ssl, int family, long count,
                 r = BIO_read(c_ssl_bio, cbuf, sizeof(cbuf));
                 if (r < 0) {
                     if (!BIO_should_retry(c_ssl_bio)) {
-                        fprintf(stderr, "ERROR in CLIENT\n");
+                        fprintf(stderr, "ERROR in CLIENT (read)\n");
                         err_in_client = 1;
                         goto err;
                     }
@@ -2103,7 +2103,7 @@ int doit_localhost(SSL *s_ssl, SSL *c_ssl, int family, long count,
                 r = BIO_write(s_ssl_bio, sbuf, i);
                 if (r < 0) {
                     if (!BIO_should_retry(s_ssl_bio)) {
-                        fprintf(stderr, "ERROR in SERVER\n");
+                        fprintf(stderr, "ERROR in SERVER (write)\n");
                         err_in_server = 1;
                         goto err;
                     }
@@ -2124,7 +2124,7 @@ int doit_localhost(SSL *s_ssl, SSL *c_ssl, int family, long count,
                 r = BIO_read(s_ssl_bio, sbuf, sizeof(sbuf));
                 if (r < 0) {
                     if (!BIO_should_retry(s_ssl_bio)) {
-                        fprintf(stderr, "ERROR in SERVER\n");
+                        fprintf(stderr, "ERROR in SERVER (read)\n");
                         err_in_server = 1;
                         goto err;
                     }
@@ -2144,8 +2144,25 @@ int doit_localhost(SSL *s_ssl, SSL *c_ssl, int family, long count,
     }
     while (cw_num > 0 || cr_num > 0 || sw_num > 0 || sr_num > 0);
 
-    if (verbose)
+    if (verbose) {
         print_details(c_ssl, "DONE via TCP connect: ");
+
+        if (BIO_get_ktls_send(SSL_get_wbio(s_ssl))
+                && BIO_get_ktls_recv(SSL_get_rbio(s_ssl)))
+            BIO_printf(bio_stdout, "Server using Kernel TLS in both directions\n");
+        else if (BIO_get_ktls_send(SSL_get_wbio(s_ssl)))
+            BIO_printf(bio_stdout, "Server using Kernel TLS for sending\n");
+        else if (BIO_get_ktls_recv(SSL_get_rbio(s_ssl)))
+            BIO_printf(bio_stdout, "Server using Kernel TLS for receiving\n");
+
+        if (BIO_get_ktls_send(SSL_get_wbio(c_ssl))
+                && BIO_get_ktls_recv(SSL_get_rbio(c_ssl)))
+            BIO_printf(bio_stdout, "Client using Kernel TLS in both directions\n");
+        else if (BIO_get_ktls_send(SSL_get_wbio(c_ssl)))
+            BIO_printf(bio_stdout, "Client using Kernel TLS for sending\n");
+        else if (BIO_get_ktls_recv(SSL_get_rbio(c_ssl)))
+            BIO_printf(bio_stdout, "Client using Kernel TLS for receiving\n");
+    }
 # ifndef OPENSSL_NO_NEXTPROTONEG
     if (verify_npn(c_ssl, s_ssl) < 0)
         goto end;