add x509 store verify example

certstore/Makefile

@@ -0,0 +1,14 @@
+CC=gcc
+WOLFSSL_INSTALL_DIR=/usr/local
+CFLAGS=-Wall
+LIBS=-L$(WOLFSSL_INSTALL_DIR)/lib -lwolfssl
+
+all: certverify
+
+certverify: certverify.o
+	$(CC) -o $@ $^ $(CFLAGS) $(LIBS)
+
+.PHONY: clean
+
+clean:
+	rm -f *.o certverify

certstore/README.md

@@ -0,0 +1,23 @@
+# wolfSSL X509 Store Example
+
+This directory contains:
+
+A simple example of using the X509_STORE compatibility layer API with wolfSSL.
+
+## Compiling and Running the Example
+
+```
+$ cd wolfssl
+$ ./autogen.sh                # If downloaded from github
+$ ./configure --enable-opensslall--enable-crl    # CRL is optional.
+$ make
+$ sudo make install
+```
+
+```
+$ cd wolfssl-examples
+$ cd certstore
+$ make
+$ ./certverify
+```
+

certstore/certverify.c

@@ -0,0 +1,113 @@
+/* certverify.c
+ *
+ * Copyright (C) 2006-2018 wolfSSL Inc.
+ *
+ * This file is part of wolfSSL.
+ *
+ * wolfSSL is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * wolfSSL is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
+ */
+
+#include <stdio.h>
+#include <wolfssl/options.h>
+#include <wolfssl/ssl.h>
+#include <wolfssl/wolfcrypt/error-crypt.h>
+#include <wolfssl/test.h>
+
+int main(int argc, char** argv)
+{
+    FILE* file;
+    int ret;
+    X509_STORE* store = NULL;
+    X509_STORE_CTX* ctx = NULL;
+    X509 *ca = NULL, *cert = NULL;
+
+    const char* caCert     = "../certs/ca-cert.pem";
+    const char* verifyCert = "../certs/server-cert.pem";
+
+    /* check if CA and x509 were passed in */
+    if (argc > 1 && strcmp(argv[1], "-h") == 0) {
+        printf("%s <ca pem file> <cert pem file>\n", argv[0]);
+        return 1;
+    }
+
+    if (argc == 3) {
+        caCert = argv[1];
+        verifyCert = argv[2];
+    }
+
+    wolfSSL_Init();
+#ifdef DEBUG_WOLFSSL
+    wolfSSL_Debugging_ON();
+#endif
+
+    /* read in CA cert */
+    file = fopen(caCert, "rb");
+    if (file == NULL) {
+        printf("Failed to open %s\n", caCert);
+        ret = -1; goto exit;
+    }
+    ca = PEM_read_X509(file, NULL, NULL, NULL);
+    fclose(file);
+    if (ca == NULL) {
+        printf("Failed to convert %s to X509\n", caCert);
+        ret = -1; goto exit;
+    }
+
+    /* read in cert to verify */
+    file = fopen(verifyCert, "rb");
+    if (file == NULL) {
+        printf("Failed to open %s\n", verifyCert);
+        ret = -1; goto exit;
+    }
+    cert = PEM_read_X509(file, NULL, NULL, NULL);
+    fclose(file);
+    if (cert == NULL) {
+        printf("Failed to convert %s to X509\n", verifyCert);
+        ret = -1; goto exit;
+    }
+
+    /* setup the x509 cert store */
+    store = X509_STORE_new();
+    if (X509_STORE_add_cert(store, ca) != WOLFSSL_SUCCESS) {
+        printf("Failed to add CA to X509 STORE\n");
+        ret = -1; goto exit;
+    }
+
+    /* setup the x509 cert store contex */
+    ctx = X509_STORE_CTX_new();
+    if (X509_STORE_CTX_init(ctx, store, cert, NULL) != WOLFSSL_SUCCESS) {
+        printf("Failed to initialize X509 STORE CTX\n");
+        ret = -1; goto exit;
+    }
+
+    /* attempt verify */
+    if (X509_verify_cert(ctx) == WOLFSSL_SUCCESS) {
+        printf("Verified certificate %s\n", verifyCert);
+    }
+    else {
+        int err = X509_STORE_CTX_get_error(ctx);
+        printf("Failed to verified certificate %s\n", verifyCert);
+        printf("Error [%d] reason [%s]\n", err, ERR_reason_error_string(err));
+    }
+
+exit:
+    X509_STORE_free(store);
+    X509_STORE_CTX_free(ctx);
+    X509_free(ca);
+    X509_free(cert);
+    wolfSSL_Cleanup();
+
+    return ret;
+}