Demo server using SSL_CTX_config

Reviewed-by: NRichard Levitte <levitte@openssl.org>

demos/bio/cmod.cnf

+# Example config module configuration
+
+# Name supplied by application to CONF_modules_load_file
+# and section containing configuration
+testapp = test_sect
+
+[test_sect]
+# list of confuration modules
+
+# SSL configuration module
+ssl_conf = ssl_sect
+
+[ssl_sect]
+# list of SSL configurations
+server = server_sect
+
+[server_sect]
+# Only support 3 curves
+Curves = P-521:P-384:P-256
+# Restricted signature algorithms
+SignatureAlgorithms = RSA+SHA512:ECDSA+SHA512
+# Certificates and keys
+RSA.Certificate=server.pem
+ECDSA.Certificate=server-ec.pem

demos/bio/server-cmod.c

+/* NOCW */
+/* demos/bio/server-cmod.c */
+
+/*
+ * A minimal TLS server it ses SSL_CTX_config and a configuration file to
+ * set most server parameters.
+ */
+
+#include <stdio.h>
+#include <signal.h>
+#include <openssl/err.h>
+#include <openssl/ssl.h>
+#include <openssl/conf.h>
+
+int main(int argc, char *argv[])
+{
+    unsigned char buf[512];
+    char *port = "*:4433";
+    BIO *in = NULL;
+    BIO *ssl_bio, *tmp;
+    SSL_CTX *ctx;
+    int ret = 1, i;
+
+    SSL_load_error_strings();
+
+    /* Add ciphers and message digests */
+    OpenSSL_add_ssl_algorithms();
+
+    if (CONF_modules_load_file("cmod.cnf", "testapp", 0) <= 0) {
+        fprintf(stderr, "Error processing config file\n");
+        goto err;
+    }
+
+    ctx = SSL_CTX_new(TLS_server_method());
+
+    if (SSL_CTX_config(ctx, "server") == 0) {
+        fprintf(stderr, "Error configuring server.\n");
+        goto err;
+    }
+
+    /* Setup server side SSL bio */
+    ssl_bio = BIO_new_ssl(ctx, 0);
+
+    if ((in = BIO_new_accept(port)) == NULL)
+        goto err;
+
+    /*
+     * This means that when a new connection is accepted on 'in', The ssl_bio
+     * will be 'duplicated' and have the new socket BIO push into it.
+     * Basically it means the SSL BIO will be automatically setup
+     */
+    BIO_set_accept_bios(in, ssl_bio);
+
+ again:
+    /*
+     * The first call will setup the accept socket, and the second will get a
+     * socket.  In this loop, the first actual accept will occur in the
+     * BIO_read() function.
+     */
+
+    if (BIO_do_accept(in) <= 0)
+        goto err;
+
+    for (;;) {
+        i = BIO_read(in, buf, sizeof(buf));
+        if (i == 0) {
+            /*
+             * If we have finished, remove the underlying BIO stack so the
+             * next time we call any function for this BIO, it will attempt
+             * to do an accept
+             */
+            printf("Done\n");
+            tmp = BIO_pop(in);
+            BIO_free_all(tmp);
+            goto again;
+        }
+        if (i < 0) {
+            if (BIO_should_retry(in))
+                continue;
+            goto err;
+        }
+        fwrite(buf, 1, i, stdout);
+        fflush(stdout);
+    }
+
+    ret = 0;
+ err:
+    if (ret) {
+        ERR_print_errors_fp(stderr);
+    }
+    BIO_free(in);
+    exit(ret);
+    return (!ret);
+}

demos/bio/server-ec.pem

+-----BEGIN PRIVATE KEY-----
+MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQg/5kYU3PUlHwfdjEN
+lC1xTZEx3o55RgtSOuOCTryDfomhRANCAARW/qUFg+qZzjcFWrST4bmkRCFu8/rn
+KTHjW2vpBXYGXKDn4AbAfYXYhM9J7v1HkkrZBPPGx53eVzs61/Pgr6Rc
+-----END PRIVATE KEY-----
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----