tls_root_store.cpp

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/*
    Copyright (C) 2021 - 2024
    Part of the Battle for Wesnoth Project https://www.wesnoth.org/
 
    This program 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.
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY.
 
    See the COPYING file for more details.
*/
 
#include "tls_root_store.hpp"
 
#include "log.hpp"
 
#ifdef _WIN32
#include <wincrypt.h>
#elif defined(__APPLE__)
#include <Security/Security.h>
#endif
 
static lg::log_domain log_network("network");
#define DBG_NW LOG_STREAM(debug, log_network)
#define LOG_NW LOG_STREAM(info, log_network)
#define WRN_NW LOG_STREAM(warn, log_network)
#define ERR_NW LOG_STREAM(err, log_network)
 
namespace network_asio
{
 
void load_tls_root_certs(boost::asio::ssl::context &ctx)
{
#ifdef _WIN32
    HCERTSTORE hStore = CertOpenSystemStore(0, TEXT("ROOT"));
    assert(hStore != NULL);
 
    X509_STORE *store = X509_STORE_new();
    PCCERT_CONTEXT pContext = NULL;
    while ((pContext = CertEnumCertificatesInStore(hStore, pContext)) != NULL) {
        X509 *x509 = d2i_X509(NULL,
            const_cast<const unsigned char**>(&pContext->pbCertEncoded),
            pContext->cbCertEncoded);
        if(x509 != NULL) {
            X509_STORE_add_cert(store, x509);
            X509_free(x509);
        }
    }
 
    CertFreeCertificateContext(pContext);
    CertCloseStore(hStore, 0);
 
    SSL_CTX_set_cert_store(ctx.native_handle(), store);
#elif defined(__APPLE__)
    X509_STORE *store = X509_STORE_new();
    CFArrayRef certs = NULL;
    // copy all system certs
    OSStatus os_status = SecTrustCopyAnchorCertificates(&certs);
 
    // check for any problems copying the certs
    if(os_status != 0) {
        ERR_NW << "Error enumerating certificates.";
 
        if (certs != NULL) {
            CFRelease(certs);
        }
        return;
    }
 
    for(CFIndex i = 0; i < CFArrayGetCount(certs); i++) {
        SecCertificateRef cert = (SecCertificateRef)CFArrayGetValueAtIndex(certs, i);
 
        // convert the cert to DER format
        CFDataRef der_cert = SecCertificateCopyData(cert);
        if(!der_cert) {
            ERR_NW << "Error getting a DER representation of a certificate.";
            continue;
        }
 
        // decode each cert to an openssl X509 object
        const uint8_t* der_cert_ptr = CFDataGetBytePtr(der_cert);
        X509* x509_cert = d2i_X509(NULL, &der_cert_ptr, CFDataGetLength(der_cert));
        if(!x509_cert) {
            ERR_NW << "Error deciding the X509 certificate.";
            CFRelease(der_cert);
            continue;
        }
 
        // Add the X509 openssl object to the verification store
        if(X509_STORE_add_cert(store, x509_cert) != 1) {
            CFRelease(der_cert);
            X509_free(x509_cert);
            ERR_NW << "Error adding the X509 certificate to the store.";
            continue;
        }
    }
 
    CFRelease(certs);
    SSL_CTX_set_cert_store(ctx.native_handle(), store);
#else
    ctx.set_default_verify_paths();
#endif
}
 
}