SGX with WolfSSL error

Ben_D_1 · ‎04-01-2018

Hi,

In having trouble verifying a certificate chain with a CA certificate inside an SGX enclave.

When I build libwolfssl with default configuration and with following code with

g++ -g -c -o main.o main.cpp
g++ -o app main.o -Wall -g -fPIC -lwolfssl

The verification works perfectly.

When I build libwolfssl.sgx.static.lib.a for SGX (with default configuration, wolfssl/IDE/LINUX-SGX/sgx_t_static.mk) and an enclave which contains the same code behaves differently.

wolfSSL_CertManagerVerifyBuffer returns ASN_SIG_CONFIRM_E which means the signature could not be verified.

 #include <wolfssl/ssl.h>

//This is Intel's AttestationReportSigningCACert.pem
const char* caCertBuf = "-----BEGIN CERTIFICATE-----\n"
"MIIFSzCCA7OgAwIBAgIJANEHdl0yo7CUMA0GCSqGSIb3DQEBCwUAMH4xCzAJBgNV\n"
"BAYTAlVTMQswCQYDVQQIDAJDQTEUMBIGA1UEBwwLU2FudGEgQ2xhcmExGjAYBgNV\n"
"BAoMEUludGVsIENvcnBvcmF0aW9uMTAwLgYDVQQDDCdJbnRlbCBTR1ggQXR0ZXN0\n"
"YXRpb24gUmVwb3J0IFNpZ25pbmcgQ0EwIBcNMTYxMTE0MTUzNzMxWhgPMjA0OTEy\n"
"MzEyMzU5NTlaMH4xCzAJBgNVBAYTAlVTMQswCQYDVQQIDAJDQTEUMBIGA1UEBwwL\n"
"U2FudGEgQ2xhcmExGjAYBgNVBAoMEUludGVsIENvcnBvcmF0aW9uMTAwLgYDVQQD\n"
"DCdJbnRlbCBTR1ggQXR0ZXN0YXRpb24gUmVwb3J0IFNpZ25pbmcgQ0EwggGiMA0G\n"
"CSqGSIb3DQEBAQUAA4IBjwAwggGKAoIBgQCfPGR+tXc8u1EtJzLA10Feu1Wg+p7e\n"
"LmSRmeaCHbkQ1TF3Nwl3RmpqXkeGzNLd69QUnWovYyVSndEMyYc3sHecGgfinEeh\n"
"rgBJSEdsSJ9FpaFdesjsxqzGRa20PYdnnfWcCTvFoulpbFR4VBuXnnVLVzkUvlXT\n"
"L/TAnd8nIZk0zZkFJ7P5LtePvykkar7LcSQO85wtcQe0R1Raf/sQ6wYKaKmFgCGe\n"
"NpEJUmg4ktal4qgIAxk+QHUxQE42sxViN5mqglB0QJdUot/o9a/V/mMeH8KvOAiQ\n"
"byinkNndn+Bgk5sSV5DFgF0DffVqmVMblt5p3jPtImzBIH0QQrXJq39AT8cRwP5H\n"
"afuVeLHcDsRp6hol4P+ZFIhu8mmbI1u0hH3W/0C2BuYXB5PC+5izFFh/nP0lc2Lf\n"
"6rELO9LZdnOhpL1ExFOq9H/B8tPQ84T3Sgb4nAifDabNt/zu6MmCGo5U8lwEFtGM\n"
"RoOaX4AS+909x00lYnmtwsDVWv9vBiJCXRsCAwEAAaOByTCBxjBgBgNVHR8EWTBX\n"
"MFWgU6BRhk9odHRwOi8vdHJ1c3RlZHNlcnZpY2VzLmludGVsLmNvbS9jb250ZW50\n"
"L0NSTC9TR1gvQXR0ZXN0YXRpb25SZXBvcnRTaWduaW5nQ0EuY3JsMB0GA1UdDgQW\n"
"BBR4Q3t2pn680K9+QjfrNXw7hwFRPDAfBgNVHSMEGDAWgBR4Q3t2pn680K9+Qjfr\n"
"NXw7hwFRPDAOBgNVHQ8BAf8EBAMCAQYwEgYDVR0TAQH/BAgwBgEB/wIBADANBgkq\n"
"hkiG9w0BAQsFAAOCAYEAeF8tYMXICvQqeXYQITkV2oLJsp6J4JAqJabHWxYJHGir\n"
"IEqucRiJSSx+HjIJEUVaj8E0QjEud6Y5lNmXlcjqRXaCPOqK0eGRz6hi+ripMtPZ\n"
"sFNaBwLQVV905SDjAzDzNIDnrcnXyB4gcDFCvwDFKKgLRjOB/WAqgscDUoGq5ZVi\n"
"zLUzTqiQPmULAQaB9c6Oti6snEFJiCQ67JLyW/E83/frzCmO5Ru6WjU4tmsmy8Ra\n"
"Ud4APK0wZTGtfPXU7w+IBdG5Ez0kE1qzxGQaL4gINJ1zMyleDnbuS8UicjJijvqA\n"
"152Sq049ESDz+1rRGc2NVEqh1KaGXmtXvqxXcTB+Ljy5Bw2ke0v8iGngFBPqCTVB\n"
"3op5KBG3RjbF6RRSzwzuWfL7QErNC8WEy5yDVARzTA5+xmBc388v9Dm21HGfcC8O\n"
"DD+gT9sSpssq0ascmvH49MOgjt1yoysLtdCtJW/9FZpoOypaHx0R+mJTLwPXVMrv\n"
"DaVzWh5aiEx+idkSGMnX\n"
"-----END CERTIFICATE-----";

//This is what comes back in X-IASReport-Signing-Certificate header
const char* certChainBuf = "-----BEGIN CERTIFICATE-----\n"
"MIIEoTCCAwmgAwIBAgIJANEHdl0yo7CWMA0GCSqGSIb3DQEBCwUAMH4xCzAJBgNV\n"
"BAYTAlVTMQswCQYDVQQIDAJDQTEUMBIGA1UEBwwLU2FudGEgQ2xhcmExGjAYBgNV\n"
"BAoMEUludGVsIENvcnBvcmF0aW9uMTAwLgYDVQQDDCdJbnRlbCBTR1ggQXR0ZXN0\n"
"YXRpb24gUmVwb3J0IFNpZ25pbmcgQ0EwHhcNMTYxMTIyMDkzNjU4WhcNMjYxMTIw\n"
"MDkzNjU4WjB7MQswCQYDVQQGEwJVUzELMAkGA1UECAwCQ0ExFDASBgNVBAcMC1Nh\n"
"bnRhIENsYXJhMRowGAYDVQQKDBFJbnRlbCBDb3Jwb3JhdGlvbjEtMCsGA1UEAwwk\n"
"SW50ZWwgU0dYIEF0dGVzdGF0aW9uIFJlcG9ydCBTaWduaW5nMIIBIjANBgkqhkiG\n"
"9w0BAQEFAAOCAQ8AMIIBCgKCAQEAqXot4OZuphR8nudFrAFiaGxxkgma/Es/BA+t\n"
"beCTUR106AL1ENcWA4FX3K+E9BBL0/7X5rj5nIgX/R/1ubhkKWw9gfqPG3KeAtId\n"
"cv/uTO1yXv50vqaPvE1CRChvzdS/ZEBqQ5oVvLTPZ3VEicQjlytKgN9cLnxbwtuv\n"
"LUK7eyRPfJW/ksddOzP8VBBniolYnRCD2jrMRZ8nBM2ZWYwnXnwYeOAHV+W9tOhA\n"
"ImwRwKF/95yAsVwd21ryHMJBcGH70qLagZ7Ttyt++qO/6+KAXJuKwZqjRlEtSEz8\n"
"gZQeFfVYgcwSfo96oSMAzVr7V0L6HSDLRnpb6xxmbPdqNol4tQIDAQABo4GkMIGh\n"
"MB8GA1UdIwQYMBaAFHhDe3amfrzQr35CN+s1fDuHAVE8MA4GA1UdDwEB/wQEAwIG\n"
"wDAMBgNVHRMBAf8EAjAAMGAGA1UdHwRZMFcwVaBToFGGT2h0dHA6Ly90cnVzdGVk\n"
"c2VydmljZXMuaW50ZWwuY29tL2NvbnRlbnQvQ1JML1NHWC9BdHRlc3RhdGlvblJl\n"
"cG9ydFNpZ25pbmdDQS5jcmwwDQYJKoZIhvcNAQELBQADggGBAGcIthtcK9IVRz4r\n"
"Rq+ZKE+7k50/OxUsmW8aavOzKb0iCx07YQ9rzi5nU73tME2yGRLzhSViFs/LpFa9\n"
"lpQL6JL1aQwmDR74TxYGBAIi5f4I5TJoCCEqRHz91kpG6Uvyn2tLmnIdJbPE4vYv\n"
"WLrtXXfFBSSPD4Afn7+3/XUggAlc7oCTizOfbbtOFlYA4g5KcYgS1J2ZAeMQqbUd\n"
"ZseZCcaZZZn65tdqee8UXZlDvx0+NdO0LR+5pFy+juM0wWbu59MvzcmTXbjsi7HY\n"
"6zd53Yq5K244fwFHRQ8eOB0IWB+4PfM7FeAApZvlfqlKOlLcZL2uyVmzRkyR5yW7\n"
"2uo9mehX44CiPJ2fse9Y6eQtcfEhMPkmHXI01sN+KwPbpA39+xOsStjhP9N1Y1a2\n"
"tQAVo+yVgLgV2Hws73Fc0o3wC78qPEA+v2aRs/Be3ZFDgDyghc/1fgU+7C+P6kbq\n"
"d4poyb6IW8KCJbxfMJvkordNOgOUUxndPHEi/tb/U7uLjLOgPA==\n"
"-----END CERTIFICATE-----\n"
"-----BEGIN CERTIFICATE-----\n"
"MIIFSzCCA7OgAwIBAgIJANEHdl0yo7CUMA0GCSqGSIb3DQEBCwUAMH4xCzAJBgNV\n"
"BAYTAlVTMQswCQYDVQQIDAJDQTEUMBIGA1UEBwwLU2FudGEgQ2xhcmExGjAYBgNV\n"
"BAoMEUludGVsIENvcnBvcmF0aW9uMTAwLgYDVQQDDCdJbnRlbCBTR1ggQXR0ZXN0\n"
"YXRpb24gUmVwb3J0IFNpZ25pbmcgQ0EwIBcNMTYxMTE0MTUzNzMxWhgPMjA0OTEy\n"
"MzEyMzU5NTlaMH4xCzAJBgNVBAYTAlVTMQswCQYDVQQIDAJDQTEUMBIGA1UEBwwL\n"
"U2FudGEgQ2xhcmExGjAYBgNVBAoMEUludGVsIENvcnBvcmF0aW9uMTAwLgYDVQQD\n"
"DCdJbnRlbCBTR1ggQXR0ZXN0YXRpb24gUmVwb3J0IFNpZ25pbmcgQ0EwggGiMA0G\n"
"CSqGSIb3DQEBAQUAA4IBjwAwggGKAoIBgQCfPGR+tXc8u1EtJzLA10Feu1Wg+p7e\n"
"LmSRmeaCHbkQ1TF3Nwl3RmpqXkeGzNLd69QUnWovYyVSndEMyYc3sHecGgfinEeh\n"
"rgBJSEdsSJ9FpaFdesjsxqzGRa20PYdnnfWcCTvFoulpbFR4VBuXnnVLVzkUvlXT\n"
"L/TAnd8nIZk0zZkFJ7P5LtePvykkar7LcSQO85wtcQe0R1Raf/sQ6wYKaKmFgCGe\n"
"NpEJUmg4ktal4qgIAxk+QHUxQE42sxViN5mqglB0QJdUot/o9a/V/mMeH8KvOAiQ\n"
"byinkNndn+Bgk5sSV5DFgF0DffVqmVMblt5p3jPtImzBIH0QQrXJq39AT8cRwP5H\n"
"afuVeLHcDsRp6hol4P+ZFIhu8mmbI1u0hH3W/0C2BuYXB5PC+5izFFh/nP0lc2Lf\n"
"6rELO9LZdnOhpL1ExFOq9H/B8tPQ84T3Sgb4nAifDabNt/zu6MmCGo5U8lwEFtGM\n"
"RoOaX4AS+909x00lYnmtwsDVWv9vBiJCXRsCAwEAAaOByTCBxjBgBgNVHR8EWTBX\n"
"MFWgU6BRhk9odHRwOi8vdHJ1c3RlZHNlcnZpY2VzLmludGVsLmNvbS9jb250ZW50\n"
"L0NSTC9TR1gvQXR0ZXN0YXRpb25SZXBvcnRTaWduaW5nQ0EuY3JsMB0GA1UdDgQW\n"
"BBR4Q3t2pn680K9+QjfrNXw7hwFRPDAfBgNVHSMEGDAWgBR4Q3t2pn680K9+Qjfr\n"
"NXw7hwFRPDAOBgNVHQ8BAf8EBAMCAQYwEgYDVR0TAQH/BAgwBgEB/wIBADANBgkq\n"
"hkiG9w0BAQsFAAOCAYEAeF8tYMXICvQqeXYQITkV2oLJsp6J4JAqJabHWxYJHGir\n"
"IEqucRiJSSx+HjIJEUVaj8E0QjEud6Y5lNmXlcjqRXaCPOqK0eGRz6hi+ripMtPZ\n"
"sFNaBwLQVV905SDjAzDzNIDnrcnXyB4gcDFCvwDFKKgLRjOB/WAqgscDUoGq5ZVi\n"
"zLUzTqiQPmULAQaB9c6Oti6snEFJiCQ67JLyW/E83/frzCmO5Ru6WjU4tmsmy8Ra\n"
"Ud4APK0wZTGtfPXU7w+IBdG5Ez0kE1qzxGQaL4gINJ1zMyleDnbuS8UicjJijvqA\n"
"152Sq049ESDz+1rRGc2NVEqh1KaGXmtXvqxXcTB+Ljy5Bw2ke0v8iGngFBPqCTVB\n"
"3op5KBG3RjbF6RRSzwzuWfL7QErNC8WEy5yDVARzTA5+xmBc388v9Dm21HGfcC8O\n"
"DD+gT9sSpssq0ascmvH49MOgjt1yoysLtdCtJW/9FZpoOypaHx0R+mJTLwPXVMrv\n"
"DaVzWh5aiEx+idkSGMnX\n"
"-----END CERTIFICATE-----";

int verifyCertChain()
{
    int   ret;
    WOLFSSL_CERT_MANAGER* cm = 0;

    cm = wolfSSL_CertManagerNew();
    if (cm == NULL) {
        printf("wolfSSL_CertManagerNew() failed\n");
        return -1;
    }

    ret = wolfSSL_CertManagerLoadCABuffer(cm, (unsigned char*)caCertBuf, strlen(caCertBuf) ,WOLFSSL_FILETYPE_PEM);
    if (ret != SSL_SUCCESS) {
        printf("wolfSSL_CertManagerLoadCA() failed (%d): %s\n",
                ret, wolfSSL_ERR_reason_error_string(ret));
        return -1;
    }

    ret = wolfSSL_CertManagerVerifyBuffer(cm, (unsigned char*)certChainBuf, strlen(certChainBuf), WOLFSSL_FILETYPE_PEM);
    if (ret != SSL_SUCCESS) {
        printf("wolfSSL_CertManagerVerify() failed (%d): %s\n",
                ret, wolfSSL_ERR_reason_error_string(ret));
        return -1;
    }

    return 0;
}

Help?

Thanks,

Ben