cert.cc

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/*
BSD 3-Clause License
 
Copyright (c) 2022, Stable Cloud Computing, Inc.
 
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
 
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*/
#include <crypto/cert.h>
#include <gtest/gtest.h>
#include <iostream>
#include <cstdlib>
#include <sstream>
#include <vector>
 
using std::cout;
using std::endl;
using std::string;
using std::stringstream;
using std::ifstream;
using std::vector;
using scc::crypto::DerDocument;
using scc::crypto::PemDocument;
using scc::crypto::RsaPrivateKey;
using scc::crypto::RsaPublicKey;
using scc::crypto::BasePtr;
 
struct CertTest : public testing::Test
{
    PemDocument doc;
    PemDocument param;
    PemDocument priv;
 
    string reldir;
 
    CertTest()
    {
        // ensure the system detects bazel and finds files in the correct location
        // see https://bazel.build/reference/test-encyclopedia for a description of bazel environment
        auto sd = getenv("TEST_SRCDIR");
        if (sd)
        {
            cout << "TEST_SRCDIR=" << sd << endl;
        }
 
        stringstream dir;
 
        if (sd)
        {
            dir << sd << "/com_stablecc_scclib/crypto/unittest/openssl/";
        }
        else
        {
            dir << "openssl/";
        }
 
        reldir = dir.str();
    }
    virtual ~CertTest() {}
 
    void load(const std::string& fn, PemDocument& doc)
    {
        cout << "loading pem from " << reldir+fn << endl;
        ifstream f(reldir+fn);
        ASSERT_NO_THROW(doc.parse(f));
    }
    void load(const std::string& fn)
    {
        load(fn, doc);
    }
    void load_ecc(const std::string& fn)        // ecc private key
    {
        cout << "loading ecc pem from " << reldir+fn << endl;
        ifstream f(reldir+fn);
        // the openssl ecc file is parameters followed by private key
        ASSERT_NO_THROW(param.parse(f));
        ASSERT_NO_THROW(priv.parse(f));
    }
 
    void compare(const BasePtr& a, const BasePtr& b)
    {
        vector<uint8_t> av, bv;
        ASSERT_NO_THROW(DerDocument::dump_element(a, av));
        ASSERT_NO_THROW(DerDocument::dump_element(b, bv));
        ASSERT_EQ(av, bv);
    }
};
 
TEST_F(CertTest, rsa_certs)
{
    using scc::crypto::PublicKeyCert;
    using scc::crypto::RsaPublicKeyCert;
    using scc::crypto::RsaPrivateKeyCert;
    using scc::crypto::KeyAlgoType;
 
    load("osslpub.pem");                        // load the openssl public key info file
    ASSERT_EQ(doc.label(), "PUBLIC KEY");
 
    PublicKeyCert cert;
    cert.parse(doc);
 
    cout << cert.str() << endl;
 
    ASSERT_EQ(cert.type(), KeyAlgoType::rsa);
 
    RsaPublicKey key;
    cert.get(key);                              // get the key from the cert
 
    cout << key.str() << endl;
 
    load("rsapub.pem");                         // load the openssl public key
    ASSERT_EQ(doc.label(), "RSA PUBLIC KEY");
 
    RsaPublicKey key2;
    RsaPublicKeyCert::parse(doc, key2);         // get the key from the cert
 
    cout << key2.str() << endl;
 
    ASSERT_EQ(key, key2);                       // stored and embedded keys must be the same
 
    PublicKeyCert cert2;
    cert2.set(key);
 
    auto d1 = cert.dump();
    auto d2 = cert2.dump();
 
    compare(d1, d2);
 
    auto k2 = RsaPublicKeyCert::dump(key);
 
    compare(k2, doc.root_ptr());
 
    load("rsapriv.pem");                        // load the openssl private key file
    ASSERT_EQ(doc.label(), "RSA PRIVATE KEY");
 
    RsaPrivateKey priv;
    RsaPrivateKeyCert::parse(doc, priv);        // pull out the private key
 
    cout << priv.str() << endl;
 
    ASSERT_EQ(key, priv.pub_key());
    ASSERT_TRUE(priv.validate(key));            // validate the key pair
 
    auto p2 = RsaPrivateKeyCert::dump(priv);
    compare(p2, doc.root_ptr());
}
 
TEST_F(CertTest, ecc_certs)
{
    using scc::crypto::PublicKeyCert;
    using scc::crypto::EcParametersCert;
    using scc::crypto::KeyAlgoType;
    using scc::crypto::EcPrivateKeyCert;
    using scc::crypto::EccGfp;
    using scc::crypto::EccGfpPoint;
    using scc::crypto::Bignum;
 
    load("ecpub.pem");                                  // load the openssl public key info file
    ASSERT_EQ(doc.label(), "PUBLIC KEY");
 
    PublicKeyCert cert;
    cert.parse(doc);
 
    cout << cert.str() << endl;
 
    ASSERT_EQ(cert.type(), KeyAlgoType::ec_p521r1);
 
    load_ecc("ecpriv.pem");
    ASSERT_EQ(param.label(), "EC PARAMETERS");          // load the parameters from the first part of openssl private key file
    ASSERT_EQ(priv.label(), "EC PRIVATE KEY");          // load the private key from second part
    cout << "** params" << endl;
    cout << param << endl;
    cout << "** priv" << endl;
    cout << priv << endl;
 
    KeyAlgoType algo;
    EcParametersCert::parse(param.root_ptr(), algo);    // get the algo from the parameters cert
    ASSERT_EQ(algo, KeyAlgoType::ec_p521r1);
 
    Bignum key;
    EccGfpPoint pub;
    EcPrivateKeyCert::parse(priv.root_ptr(), key, algo, pub);       // get private, public keys and algo from private cert
    ASSERT_EQ(algo, KeyAlgoType::ec_p521r1);
 
    cout << "*** private cert" << endl;
    cout << "key: " << key << endl;
    cout << "algo: " << algo << endl;
    Bignum x, y;
    pub.get(x, y);
    cout << "pub: width=( " << x.width() << " , " << y.width() << " ) val=( " << x << " , " << y << " )" << endl;
 
    ASSERT_TRUE(EccGfp::validate_key_pair(key, pub));       // validate the private and public key pair
 
    EccGfpPoint pub2;
    cert.get(pub2);             // pull out the public key from the public key certificate
    ASSERT_EQ(pub, pub2);
 
    // dump and compare
 
    BasePtr d = EcParametersCert::dump(algo);
    compare(d, param.root_ptr());
 
    BasePtr d2 = EcPrivateKeyCert::dump(key, algo, pub);
    compare(d2, priv.root_ptr());
}
 
struct CaBundleTest : public testing::Test
{
    std::vector<BasePtr> cacerts;
 
    CaBundleTest()
    {
        ifstream f("/etc/ssl/certs/ca-certificates.crt");
        while (1)
        {
            try
            {
                // ca bundle is a bunch of root x.509 certificates added together
                PemDocument doc;
                doc.parse(f);
                cacerts.push_back(doc.root_ptr());
            }
            catch (std::exception& ex)
            {
                cout << "loaded ca certs bundle, exception: " << ex.what() << endl;
                break;
            }
        }
    }
 
    virtual ~CaBundleTest() {}
};
 
TEST_F(CaBundleTest, sanity_test)
{
    using scc::crypto::PublicKeyCert;
    using scc::crypto::KeyAlgoType;
    using scc::crypto::EccGfpPoint;
 
    cout << "Loaded ca certs, size=" << cacerts.size() << endl;
 
    int n = 0;
    for (auto& c : cacerts)
    {
        cout << "*******CA CERT " << ++n << endl;
 
        // find the subjectpublickeyinfo element in the x.509 certificate
        ASSERT_TRUE(c->is_seq());
        ASSERT_GT(c->contain().size(), 0);
        ASSERT_TRUE(c->contain()[0]->is_seq());
        ASSERT_GE(c->contain()[0]->contain().size(), 7);
 
        PublicKeyCert cert;
        cert.parse(c->contain()[0]->contain()[6]);
        cout << cert.str() << endl;
 
        ASSERT_NE(cert.type(), KeyAlgoType::unknown);       // we must be able to understand the root keys
 
        if (cert.type() == KeyAlgoType::rsa)
        {
            RsaPublicKey key;
            cert.get(key);
            ASSERT_GT(key.width(), 0);
            cout << "rsa key width: " << key.width() << endl;
        }
        else                    // this is ecdsa type
        {
            EccGfpPoint key;
            cert.get(key);
            ASSERT_TRUE(key.valid());
            cout << "ecdsa point is valid" << endl;
        }
    }
}