294 lines
9.1 KiB
C
294 lines
9.1 KiB
C
/* ocsp-server.c
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*
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* Standalone OCSP stapling server example.
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*
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* Copyright (C) 2006-2025 wolfSSL Inc.
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*
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* This file is part of wolfSSL. (formerly known as CyaSSL)
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*
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* wolfSSL is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* wolfSSL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <wolfssl/options.h>
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#include <wolfssl/ssl.h>
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#include <wolfssl/ocsp.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#define SERVER_CERT "server-certs/server1-cert.pem"
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#define SERVER_KEY "server-certs/server1-key.pem"
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#define SERVER_ISSUER_CERT "client-certs/intermediate1-ca-cert.pem"
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#define SERVER_PORT 11111
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#define HTTP_TMP_BUFFER_SIZE 512
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#define URL_SIZE 128
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static unsigned char* ocsp_resp = NULL;
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static int ocsp_resp_sz = 0;
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/* This callback can be used to choose between multiple certs/keys. It can
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* be used to select certs based on SNI, ciphersuites, etc. Here we just
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* load a single cert/key. */
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static int cert_cb(WOLFSSL* ssl, void* arg)
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{
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(void)arg;
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if (wolfSSL_use_certificate_chain_file(ssl, SERVER_CERT) != WOLFSSL_SUCCESS) {
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fprintf(stderr, "Error loading server certificate: %s\n", wolfSSL_ERR_reason_error_string(wolfSSL_get_error(ssl, 0)));
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return 0;
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}
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if (wolfSSL_use_PrivateKey_file(ssl, SERVER_KEY, WOLFSSL_FILETYPE_PEM) != WOLFSSL_SUCCESS) {
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fprintf(stderr, "Error loading server private key: %s\n", wolfSSL_ERR_reason_error_string(wolfSSL_get_error(ssl, 0)));
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return 0;
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}
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return 1;
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}
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int ocsp_cb(void* ctx, const char* url, int urlSz,
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byte* ocspReqBuf, int ocspReqSz, byte** ocspRespBuf)
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{
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int httpBufSz = 0;
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byte httpBuf[HTTP_TMP_BUFFER_SIZE];
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char path[URL_SIZE];
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char domainName[URL_SIZE];
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word16 port = 0;
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SOCKET_T sfd = SOCKET_INVALID;
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int ret = -1;
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int respSz = 0;
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if (wolfIO_DecodeUrl(url, urlSz, domainName, path, &port) != 0) {
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WOLFSSL_MSG("Unable to decode OCSP URL");
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goto cleanup;
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}
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httpBufSz = wolfIO_HttpBuildRequestOcsp(domainName, path, ocspReqSz,
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httpBuf, HTTP_TMP_BUFFER_SIZE);
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if (wolfIO_TcpConnect(&sfd, domainName, port, 0) != 0) {
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WOLFSSL_MSG("OCSP Responder connection failed");
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goto cleanup;
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}
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if (wolfIO_Send(sfd, (char*)httpBuf, httpBufSz, 0) != httpBufSz) {
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WOLFSSL_MSG("OCSP http request failed");
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goto cleanup;
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}
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if (wolfIO_Send(sfd, (char*)ocspReqBuf, ocspReqSz, 0) != ocspReqSz) {
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WOLFSSL_MSG("OCSP ocsp request failed");
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goto cleanup;
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}
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if ((respSz = wolfIO_HttpProcessResponseOcsp((int)sfd, ocspRespBuf, httpBuf,
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HTTP_TMP_BUFFER_SIZE, ctx)) <= 0) {
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WOLFSSL_MSG("OCSP http response failed");
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goto cleanup;
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}
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ocsp_resp = *ocspRespBuf;
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ocsp_resp_sz = ret = respSz;
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cleanup:
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if (sfd != SOCKET_INVALID)
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CloseSocket(sfd);
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return ret;
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}
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static int fetch_ocsp_response(unsigned char** resp, int* respSz)
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{
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int ret = -1;
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WOLFSSL_CERT_MANAGER* cm = NULL;
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unsigned char* certPem = NULL;
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unsigned char* certDer = NULL;
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long certPemSz = 0;
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int certDerSz = 0;
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FILE* f = NULL;
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*resp = NULL;
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*respSz = 0;
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f = fopen(SERVER_CERT, "rb");
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if (!f) {
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fprintf(stderr, "Failed to open server cert: %s\n", SERVER_CERT);
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goto cleanup;
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}
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fseek(f, 0, SEEK_END);
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certPemSz = ftell(f);
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fseek(f, 0, SEEK_SET);
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certPem = (unsigned char*)malloc(certPemSz);
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if (!certPem) {
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fprintf(stderr, "malloc failed\n");
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goto cleanup;
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}
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if (fread(certPem, 1, certPemSz, f) != (size_t)certPemSz) {
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fprintf(stderr, "fread failed\n");
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goto cleanup;
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}
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certDer = (unsigned char*)malloc(certPemSz);
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if (!certDer) {
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fprintf(stderr, "malloc failed\n");
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goto cleanup;
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}
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certDerSz = wolfSSL_CertPemToDer(certPem, (int)certPemSz, certDer, (int)certPemSz, CERT_TYPE);
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if (certDerSz <= 0) {
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fprintf(stderr, "wolfSSL_CertPemToDer failed\n");
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goto cleanup;
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}
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cm = wolfSSL_CertManagerNew();
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if (!cm) {
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fprintf(stderr, "wolfSSL_CertManagerNew failed\n");
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goto cleanup;
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}
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if (wolfSSL_CertManagerEnableOCSP(cm, WOLFSSL_OCSP_NO_NONCE) != WOLFSSL_SUCCESS) {
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fprintf(stderr, "wolfSSL_CertManagerEnableOCSP failed\n");
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goto cleanup;
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}
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if (wolfSSL_CertManagerLoadCA(cm, SERVER_ISSUER_CERT, NULL) != WOLFSSL_SUCCESS) {
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fprintf(stderr, "wolfSSL_CertManagerLoadCA failed for issuer cert: %s\n", SERVER_ISSUER_CERT);
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goto cleanup;
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}
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wolfSSL_CertManagerSetOCSP_Cb(cm, ocsp_cb, NULL, NULL);
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/* This calls ocsp_cb to fetch the response and verifies it. ocsp_cb stores the response globally. */
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if (wolfSSL_CertManagerCheckOCSP(cm, certDer, certDerSz) == WOLFSSL_SUCCESS) {
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ret = 0;
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} else {
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fprintf(stderr, "wolfSSL_CertManagerCheckOCSP failed or OCSP not verified\n");
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}
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cleanup:
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if (f) fclose(f);
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if (certPem) free(certPem);
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if (certDer) free(certDer);
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if (cm) wolfSSL_CertManagerFree(cm);
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return ret;
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}
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static int status_cb(WOLFSSL* ssl, void* ctx)
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{
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unsigned char* resp_buf;
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(void)ctx;
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if (ocsp_resp == NULL || ocsp_resp_sz == 0)
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return WOLFSSL_OCSP_STATUS_CB_ALERT_FATAL;
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resp_buf = (unsigned char*)malloc(ocsp_resp_sz);
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if (resp_buf == NULL)
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return WOLFSSL_OCSP_STATUS_CB_ALERT_FATAL;
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memcpy(resp_buf, ocsp_resp, ocsp_resp_sz);
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if (wolfSSL_set_tlsext_status_ocsp_resp(ssl, resp_buf, ocsp_resp_sz) != WOLFSSL_SUCCESS) {
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free(resp_buf);
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return WOLFSSL_OCSP_STATUS_CB_ALERT_FATAL;
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}
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/* wolfSSL takes ownership of resp_buf, so do not free it here */
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return WOLFSSL_OCSP_STATUS_CB_OK;
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}
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int main()
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{
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int listenfd = -1, connfd = -1;
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struct sockaddr_in serv_addr;
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WOLFSSL_CTX* ctx = NULL;
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WOLFSSL* ssl = NULL;
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int ret = 1;
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if (fetch_ocsp_response(&ocsp_resp, &ocsp_resp_sz) != 0) {
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fprintf(stderr, "Failed to fetch OCSP response at startup\n");
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goto cleanup;
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}
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wolfSSL_Init();
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ctx = wolfSSL_CTX_new(wolfTLS_server_method());
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if (!ctx) {
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fprintf(stderr, "wolfSSL_CTX_new failed\n");
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goto cleanup;
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}
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wolfSSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, NULL);
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wolfSSL_CTX_set_cert_cb(ctx, cert_cb, NULL);
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if (wolfSSL_CTX_set_tlsext_status_cb(ctx, status_cb) != WOLFSSL_SUCCESS) {
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fprintf(stderr, "wolfSSL_CTX_set_tlsext_status_cb failed\n");
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goto cleanup;
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}
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if (wolfSSL_CTX_set_tlsext_status_arg(ctx, NULL) <= 0) {
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fprintf(stderr, "wolfSSL_CTX_set_tlsext_status_arg failed\n");
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goto cleanup;
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}
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if (wolfSSL_CTX_EnableOCSPStapling(ctx) != WOLFSSL_SUCCESS) {
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fprintf(stderr, "wolfSSL_CTX_EnableOCSPStapling failed\n");
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goto cleanup;
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}
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listenfd = socket(AF_INET, SOCK_STREAM, 0);
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if (listenfd < 0) {
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perror("socket");
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goto cleanup;
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}
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int optval = 1;
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if (setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)) < 0) {
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perror("setsockopt");
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goto cleanup;
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}
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memset(&serv_addr, 0, sizeof(serv_addr));
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serv_addr.sin_family = AF_INET;
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serv_addr.sin_addr.s_addr = INADDR_ANY;
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serv_addr.sin_port = htons(SERVER_PORT);
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if (bind(listenfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) < 0) {
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perror("bind");
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goto cleanup;
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}
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if (listen(listenfd, 1) < 0) {
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perror("listen");
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goto cleanup;
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}
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printf("Server: waiting for connection...\n");
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connfd = accept(listenfd, NULL, NULL);
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if (connfd < 0) {
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perror("accept");
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goto cleanup;
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}
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ssl = wolfSSL_new(ctx);
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if (!ssl) {
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fprintf(stderr, "wolfSSL_new failed\n");
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goto cleanup;
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}
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wolfSSL_set_fd(ssl, connfd);
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if (wolfSSL_accept(ssl) == WOLFSSL_SUCCESS) {
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printf("Server: TLS handshake success\n");
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printf("Negotiated TLS version: %s\n", wolfSSL_get_version(ssl));
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if (wolfSSL_write(ssl, "hello", 5) != 5) {
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fprintf(stderr, "Server: wolfSSL_write failed\n");
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goto cleanup;
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}
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} else {
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fprintf(stderr, "Server: TLS handshake failed: %s\n", wolfSSL_ERR_reason_error_string(wolfSSL_get_error(ssl, 0)));
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goto cleanup;
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}
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ret = 0;
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cleanup:
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if (ssl) wolfSSL_free(ssl);
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if (connfd >= 0) close(connfd);
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if (listenfd >= 0) close(listenfd);
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if (ctx) wolfSSL_CTX_free(ctx);
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wolfSSL_Cleanup();
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return ret;
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}
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