Add -s option to openssl ciphers

With this option, the command only shows the ciphers supported by the
SSL method.

ok beck jsing

1 files changed, 20 insertions, 4 deletions

diff --git a/src/usr.bin/openssl/ciphers.c b/src/usr.bin/openssl/ciphers.c
index a20f19c3af..6a96dfcc92 100644
--- a/src/usr.bin/openssl/ciphers.c
+++ b/src/usr.bin/openssl/ciphers.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ciphers.c,v 1.10 2019/07/14 03:30:45 guenther Exp $ */
+/* $OpenBSD: ciphers.c,v 1.11 2022/07/14 08:07:54 tb Exp $ */
 /*
  * Copyright (c) 2014 Joel Sing <jsing@openbsd.org>
  *
@@ -26,6 +26,7 @@
 
 struct {
         int usage;
+        int use_supported;
         int verbose;
 } ciphers_config;
 
@@ -41,6 +42,12 @@ static const struct option ciphers_options[] = {
                 .opt.flag = &ciphers_config.usage,
         },
         {
+                .name = "s",
+                .desc = "Only list ciphers that are supported by the TLS method",
+                .type = OPTION_FLAG,
+                .opt.flag = &ciphers_config.use_supported,
+        },
+        {
                 .name = "tls1",
                 .desc = "This option is deprecated since it is the default",
                 .type = OPTION_DISCARD,
@@ -65,7 +72,7 @@ static const struct option ciphers_options[] = {
 static void
 ciphers_usage(void)
 {
-        fprintf(stderr, "usage: ciphers [-hVv] [-tls1] [cipherlist]\n");
+        fprintf(stderr, "usage: ciphers [-hsVv] [-tls1] [cipherlist]\n");
         options_usage(ciphers_options);
 }
 
@@ -74,6 +81,7 @@ ciphers_main(int argc, char **argv)
 {
         char *cipherlist = NULL;
         STACK_OF(SSL_CIPHER) *ciphers;
+        STACK_OF(SSL_CIPHER) *supported_ciphers = NULL;
         const SSL_CIPHER *cipher;
         SSL_CTX *ssl_ctx = NULL;
         SSL *ssl = NULL;
@@ -112,8 +120,15 @@ ciphers_main(int argc, char **argv)
         if ((ssl = SSL_new(ssl_ctx)) == NULL)
                 goto err;
 
-        if ((ciphers = SSL_get_ciphers(ssl)) == NULL)
-                goto err;
+        if (ciphers_config.use_supported) {
+                if ((supported_ciphers =
+                    SSL_get1_supported_ciphers(ssl)) == NULL)
+                        goto err;
+                ciphers = supported_ciphers;
+        } else {
+                if ((ciphers = SSL_get_ciphers(ssl)) == NULL)
+                        goto err;
+        }
 
         for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
                 cipher = sk_SSL_CIPHER_value(ciphers, i);
@@ -145,6 +160,7 @@ ciphers_main(int argc, char **argv)
         rv = 1;
 
  done:
+        sk_SSL_CIPHER_free(supported_ciphers);
         SSL_CTX_free(ssl_ctx);
         SSL_free(ssl);