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wolfssl-examples/tls/server-tls-verifycallback.c

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/* server-tls-verifycallback.c
*
* Copyright (C) 2006-2020 wolfSSL Inc.
*
* This file is part of wolfSSL. (formerly known as CyaSSL)
*
* 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 02110-1301, USA
*/
/* This example requires the client to send "client-cert.pem" */
/* Test using wolfSSL example client:
./examples/client/client */
/* the usual suspects */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
/* socket includes */
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <unistd.h>
/* wolfSSL */
#include <wolfssl/options.h>
#include <wolfssl/ssl.h>
#define DEFAULT_PORT 11111
#define CERT_FILE "../certs/server-cert.pem"
#define KEY_FILE "../certs/server-key.pem"
#define CLIENT_CERT_FILE "../certs/client-cert.pem"
/* The verify callback is called for every certificate only when
* --enable-opensslextra is defined because it sets WOLFSSL_ALWAYS_VERIFY_CB and
* WOLFSSL_VERIFY_CB_ALL_CERTS.
* Normal cases of the verify callback only occur on certificate failures when the
* wolfSSL_set_verify(ssl, SSL_VERIFY_PEER, myVerifyCb); is called
*/
static int myVerifyCb(int preverify, WOLFSSL_X509_STORE_CTX* store)
{
char buffer[WOLFSSL_MAX_ERROR_SZ];
#if defined(OPENSSL_EXTRA) || defined(OPENSSL_EXTRA_X509_SMALL)
WOLFSSL_X509* peer;
#if defined(SHOW_CERTS) && !defined(NO_FILESYSTEM)
WOLFSSL_BIO* bio = NULL;
WOLFSSL_STACK* sk = NULL;
X509* x509 = NULL;
int i = 0;
#endif
#endif
(void)preverify;
/* Verify Callback Arguments:
* preverify: 1=Verify Okay, 0=Failure
* store->error: Failure error code (0 indicates no failure)
* store->current_cert: Current WOLFSSL_X509 object (only with OPENSSL_EXTRA)
* store->error_depth: Current Index
* store->domain: Subject CN as string (null term)
* store->totalCerts: Number of certs presented by peer
* store->certs[i]: A `WOLFSSL_BUFFER_INFO` with plain DER for each cert
* store->store: WOLFSSL_X509_STORE with CA cert chain
* store->store->cm: WOLFSSL_CERT_MANAGER
* store->ex_data: The WOLFSSL object pointer
* store->discardSessionCerts: When set to non-zero value session certs
will be discarded (only with SESSION_CERTS)
*/
printf("In verification callback, error = %d, %s\n", store->error,
wolfSSL_ERR_error_string(store->error, buffer));
#if defined(OPENSSL_EXTRA) || defined(OPENSSL_EXTRA_X509_SMALL)
peer = store->current_cert;
if (peer) {
char* issuer = wolfSSL_X509_NAME_oneline(
wolfSSL_X509_get_issuer_name(peer), 0, 0);
char* subject = wolfSSL_X509_NAME_oneline(
wolfSSL_X509_get_subject_name(peer), 0, 0);
printf("\tPeer's cert info:\n issuer : %s\n subject: %s\n", issuer,
subject);
XFREE(subject, 0, DYNAMIC_TYPE_OPENSSL);
XFREE(issuer, 0, DYNAMIC_TYPE_OPENSSL);
#if defined(SHOW_CERTS) && !defined(NO_FILESYSTEM)
/* avoid printing duplicate certs */
if (store->depth == 1) {
/* retrieve x509 certs and display them on stdout */
sk = wolfSSL_X509_STORE_GetCerts(store);
for (i = 0; i < wolfSSL_sk_X509_num(sk); i++) {
x509 = wolfSSL_sk_X509_value(sk, i);
bio = wolfSSL_BIO_new(wolfSSL_BIO_s_file());
if (bio != NULL) {
wolfSSL_BIO_set_fp(bio, stdout, BIO_NOCLOSE);
wolfSSL_X509_print(bio, x509);
wolfSSL_BIO_free(bio);
}
}
wolfSSL_sk_X509_free(sk);
}
#endif
}
else
printf("\tPeer has no cert!\n");
#else
printf("\tPeer certs: %d\n", store->totalCerts);
#ifdef SHOW_CERTS
{ int i;
for (i=0; i<store->totalCerts; i++) {
WOLFSSL_BUFFER_INFO* cert = &store->certs[i];
printf("\t\tCert %d: Ptr %p, Len %u\n", i, cert->buffer, cert->length);
}
}
#endif /* SHOW_CERTS */
#endif /* OPENSSL_EXTRA || OPENSSL_EXTRA_X509_SMALL */
printf("\tSubject's domain name at %d is %s\n", store->error_depth, store->domain);
/* If error indicate we are overriding it for testing purposes */
if (store->error != 0) {
printf("\tAllowing failed certificate check, testing only "
"(shouldn't do this in production)\n");
}
/* A non-zero return code indicates failure override */
return preverify;
}
int main()
{
int sockfd = SOCKET_INVALID;
int connd = SOCKET_INVALID;
struct sockaddr_in servAddr;
struct sockaddr_in clientAddr;
socklen_t size = sizeof(clientAddr);
char buff[256];
size_t len;
int shutdown = 0;
int ret;
const char* reply = "I hear ya fa shizzle!\n";
/* declare wolfSSL objects */
WOLFSSL_CTX* ctx = NULL;
WOLFSSL* ssl = NULL;
/* Initialize wolfSSL */
wolfSSL_Init();
/* Create a socket that uses an internet IPv4 address,
* Sets the socket to be stream based (TCP),
* 0 means choose the default protocol. */
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
fprintf(stderr, "ERROR: failed to create the socket\n");
ret = -1;
goto exit;
}
/* Create and initialize WOLFSSL_CTX */
if ((ctx = wolfSSL_CTX_new(wolfTLSv1_2_server_method())) == NULL) {
fprintf(stderr, "ERROR: failed to create WOLFSSL_CTX\n");
ret = -1;
goto exit;
}
/* Load server certificates into WOLFSSL_CTX */
if ((ret = wolfSSL_CTX_use_certificate_file(ctx, CERT_FILE, WOLFSSL_FILETYPE_PEM))
!= WOLFSSL_SUCCESS) {
fprintf(stderr, "ERROR: failed to load %s, please check the file.\n",
CERT_FILE);
goto exit;
}
/* Load server key into WOLFSSL_CTX */
if ((ret = wolfSSL_CTX_use_PrivateKey_file(ctx, KEY_FILE, WOLFSSL_FILETYPE_PEM))
!= WOLFSSL_SUCCESS) {
fprintf(stderr, "ERROR: failed to load %s, please check the file.\n",
KEY_FILE);
goto exit;
}
/* Load the trusted certificates */
/* May be called multiple times to continue loading trusted certs into the
wolfSSL Certificate Manager */
if ((ret = wolfSSL_CTX_load_verify_locations(ctx, CLIENT_CERT_FILE, NULL))
!= WOLFSSL_SUCCESS) {
fprintf(stderr, "ERROR: failed to load %s, please check the file.\n",
CLIENT_CERT_FILE);
goto exit;
}
/* require client certificate and verify all peers */
wolfSSL_CTX_set_verify(ctx,
(WOLFSSL_VERIFY_PEER | WOLFSSL_VERIFY_FAIL_IF_NO_PEER_CERT),
myVerifyCb);
/* Initialize the server address struct with zeros */
memset(&servAddr, 0, sizeof(servAddr));
/* Fill in the server address */
servAddr.sin_family = AF_INET; /* using IPv4 */
servAddr.sin_port = htons(DEFAULT_PORT); /* on DEFAULT_PORT */
servAddr.sin_addr.s_addr = INADDR_ANY; /* from anywhere */
/* Bind the server socket to our port */
if (bind(sockfd, (struct sockaddr*)&servAddr, sizeof(servAddr)) == -1) {
fprintf(stderr, "ERROR: failed to bind\n");
ret = -1;
goto exit;
}
/* Listen for a new connection, allow 5 pending connections */
if (listen(sockfd, 5) == -1) {
fprintf(stderr, "ERROR: failed to listen\n");
ret = -1;
goto exit;
}
/* Continue to accept clients until shutdown is issued */
while (!shutdown) {
printf("Waiting for a connection...\n");
/* Accept client connections */
if ((connd = accept(sockfd, (struct sockaddr*)&clientAddr, &size))
== -1) {
fprintf(stderr, "ERROR: failed to accept the connection\n\n");
ret = -1;
goto exit;
}
/* Create a WOLFSSL object */
if ((ssl = wolfSSL_new(ctx)) == NULL) {
fprintf(stderr, "ERROR: failed to create WOLFSSL object\n");
ret = -1;
goto exit;
}
/* Attach wolfSSL to the socket */
wolfSSL_set_fd(ssl, connd);
/* Establish TLS connection */
ret = wolfSSL_accept(ssl);
if (ret != WOLFSSL_SUCCESS) {
fprintf(stderr, "wolfSSL_accept error = %d\n",
wolfSSL_get_error(ssl, ret));
goto exit;
}
printf("Client connected successfully\n");
/* Read the client data into our buff array */
memset(buff, 0, sizeof(buff));
if ((ret = wolfSSL_read(ssl, buff, sizeof(buff)-1)) == -1) {
fprintf(stderr, "ERROR: failed to read\n");
goto exit;
}
/* Print to stdout any data the client sends */
printf("Client: %s\n", buff);
/* Check for server shutdown command */
if (strncmp(buff, "shutdown", 8) == 0) {
printf("Shutdown command issued!\n");
shutdown = 1;
}
/* Write our reply into buff */
memset(buff, 0, sizeof(buff));
memcpy(buff, reply, strlen(reply));
len = strnlen(buff, sizeof(buff));
/* Reply back to the client */
if ((ret = wolfSSL_write(ssl, buff, len)) != len) {
fprintf(stderr, "ERROR: failed to write\n");
goto exit;
}
/* Cleanup after this connection */
wolfSSL_free(ssl); /* Free the wolfSSL object */
close(connd); /* Close the connection to the client */
}
printf("Shutdown complete\n");
ret = 0;
exit:
/* Cleanup and return */
if (ssl)
wolfSSL_free(ssl); /* Free the wolfSSL object */
if (connd != SOCKET_INVALID)
close(connd); /* Close the connection to the client */
if (sockfd != SOCKET_INVALID)
close(sockfd); /* Close the socket listening for clients */
if (ctx)
wolfSSL_CTX_free(ctx); /* Free the wolfSSL context object */
wolfSSL_Cleanup(); /* Cleanup the wolfSSL environment */
return ret; /* Return reporting a success */
}
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