certificate.cpp - openbmc/phosphor-certificate-manager - Gitiles

 #include "certificate.hpp"

 #include <openssl/bio.h>
 #include <openssl/crypto.h>
 #include <openssl/err.h>
 #include <openssl/evp.h>
 #include <openssl/pem.h>
 #include <openssl/x509v3.h>

 #include <fstream>
 #include <phosphor-logging/elog-errors.hpp>
 #include <xyz/openbmc_project/Certs/error.hpp>
 #include <xyz/openbmc_project/Common/error.hpp>

 namespace phosphor
 {
 namespace certs
 {
 // RAII support for openSSL functions.
 using BIO_MEM_Ptr = std::unique_ptr<BIO, decltype(&::BIO_free)>;
 using X509_STORE_CTX_Ptr =
     std::unique_ptr<X509_STORE_CTX, decltype(&::X509_STORE_CTX_free)>;
 using X509_LOOKUP_Ptr =
     std::unique_ptr<X509_LOOKUP, decltype(&::X509_LOOKUP_free)>;
 using ASN1_TIME_ptr = std::unique_ptr<ASN1_TIME, decltype(&ASN1_STRING_free)>;
 using EVP_PKEY_Ptr = std::unique_ptr<EVP_PKEY, decltype(&::EVP_PKEY_free)>;
 using BUF_MEM_Ptr = std::unique_ptr<BUF_MEM, decltype(&::BUF_MEM_free)>;
 using InternalFailure =
     sdbusplus::xyz::openbmc_project::Common::Error::InternalFailure;
 using InvalidCertificate =
     sdbusplus::xyz::openbmc_project::Certs::Error::InvalidCertificate;
 using Reason = xyz::openbmc_project::Certs::InvalidCertificate::REASON;

 // Trust chain related errors.`
 #define TRUST_CHAIN_ERR(errnum)                                                \
     ((errnum == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT) ||                     \
      (errnum == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN) ||                       \
      (errnum == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY) ||               \
      (errnum == X509_V_ERR_CERT_UNTRUSTED) ||                                  \
      (errnum == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE))

 // Refer to schema 2018.3
 // http://redfish.dmtf.org/schemas/v1/Certificate.json#/definitions/KeyUsage for
 // supported KeyUsage types in redfish
 // Refer to
 // https://github.com/openssl/openssl/blob/master/include/openssl/x509v3.h for
 // key usage bit fields
 std::map<uint8_t, std::string> keyUsageToRfStr = {
     {KU_DIGITAL_SIGNATURE, "DigitalSignature"},
     {KU_NON_REPUDIATION, "NonRepudiation"},
     {KU_KEY_ENCIPHERMENT, "KeyEncipherment"},
     {KU_DATA_ENCIPHERMENT, "DataEncipherment"},
     {KU_KEY_AGREEMENT, "KeyAgreement"},
     {KU_KEY_CERT_SIGN, "KeyCertSign"},
     {KU_CRL_SIGN, "CRLSigning"},
     {KU_ENCIPHER_ONLY, "EncipherOnly"},
     {KU_DECIPHER_ONLY, "DecipherOnly"}};

 // Refer to schema 2018.3
 // http://redfish.dmtf.org/schemas/v1/Certificate.json#/definitions/KeyUsage for
 // supported Extended KeyUsage types in redfish
 std::map<uint8_t, std::string> extendedKeyUsageToRfStr = {
     {NID_server_auth, "ServerAuthentication"},
     {NID_client_auth, "ClientAuthentication"},
     {NID_email_protect, "EmailProtection"},
     {NID_OCSP_sign, "OCSPSigning"},
     {NID_ad_timeStamping, "Timestamping"},
     {NID_code_sign, "CodeSigning"}};

 Certificate::Certificate(sdbusplus::bus::bus& bus, const std::string& objPath,
                          const CertificateType& type,
                          const UnitsToRestart& unit,
                          const CertInstallPath& installPath,
                          const CertUploadPath& uploadPath) :
     CertIfaces(bus, objPath.c_str(), true),
     bus(bus), objectPath(objPath), certType(type), unitToRestart(unit),
     certInstallPath(installPath)
 {
     auto installHelper = [this](const auto& filePath) {
         if (!compareKeys(filePath))
         {
             elog<InvalidCertificate>(
                 Reason("Private key does not match the Certificate"));
         };
     };
     typeFuncMap[SERVER] = installHelper;
     typeFuncMap[CLIENT] = installHelper;
     typeFuncMap[AUTHORITY] = [](auto filePath) {};
     install(uploadPath);
     this->emit_object_added();
 }

 Certificate::~Certificate()
 {
     if (!fs::remove(certInstallPath))
     {
         log<level::INFO>("Certificate file not found!",
                          entry("PATH=%s", certInstallPath.c_str()));
     }
     else if (!unitToRestart.empty())
     {
         reloadOrReset(unitToRestart);
     }
 }

 void Certificate::replace(const std::string filePath)
 {
     install(filePath);
 }

 void Certificate::install(const std::string& filePath)
 {
     log<level::INFO>("Certificate install ",
                      entry("FILEPATH=%s", filePath.c_str()));
     auto errCode = X509_V_OK;

     // Verify the certificate file
     fs::path file(filePath);
     if (!fs::exists(file))
     {
         log<level::ERR>("File is Missing", entry("FILE=%s", filePath.c_str()));
         elog<InternalFailure>();
     }

     try
     {
         if (fs::file_size(filePath) == 0)
         {
             // file is empty
             log<level::ERR>("File is empty",
                             entry("FILE=%s", filePath.c_str()));
             elog<InvalidCertificate>(Reason("File is empty"));
         }
     }
     catch (const fs::filesystem_error& e)
     {
         // Log Error message
         log<level::ERR>(e.what(), entry("FILE=%s", filePath.c_str()));
         elog<InternalFailure>();
     }

     // Defining store object as RAW to avoid double free.
     // X509_LOOKUP_free free up store object.
     // Create an empty X509_STORE structure for certificate validation.
     auto x509Store = X509_STORE_new();
     if (!x509Store)
     {
         log<level::ERR>("Error occured during X509_STORE_new call");
         elog<InternalFailure>();
     }

     OpenSSL_add_all_algorithms();

     // ADD Certificate Lookup method.
     X509_LOOKUP_Ptr lookup(X509_STORE_add_lookup(x509Store, X509_LOOKUP_file()),
                            ::X509_LOOKUP_free);
     if (!lookup)
     {
         // Normally lookup cleanup function interanlly does X509Store cleanup
         // Free up the X509Store.
         X509_STORE_free(x509Store);
         log<level::ERR>("Error occured during X509_STORE_add_lookup call");
         elog<InternalFailure>();
     }
     // Load Certificate file.
     errCode = X509_LOOKUP_load_file(lookup.get(), filePath.c_str(),
                                     X509_FILETYPE_PEM);
     if (errCode != 1)
     {
         log<level::ERR>("Error occured during X509_LOOKUP_load_file call",
                         entry("FILE=%s", filePath.c_str()));
         elog<InvalidCertificate>(Reason("Invalid certificate file format"));
     }

     // Load Certificate file into the X509 structre.
     X509_Ptr cert = std::move(loadCert(filePath));
     X509_STORE_CTX_Ptr storeCtx(X509_STORE_CTX_new(), ::X509_STORE_CTX_free);
     if (!storeCtx)
     {
         log<level::ERR>("Error occured during X509_STORE_CTX_new call",
                         entry("FILE=%s", filePath.c_str()));
         elog<InternalFailure>();
     }

     errCode = X509_STORE_CTX_init(storeCtx.get(), x509Store, cert.get(), NULL);
     if (errCode != 1)
     {
         log<level::ERR>("Error occured during X509_STORE_CTX_init call",
                         entry("FILE=%s", filePath.c_str()));
         elog<InternalFailure>();
     }

     // Set time to current time.
     auto locTime = time(nullptr);

     X509_STORE_CTX_set_time(storeCtx.get(), X509_V_FLAG_USE_CHECK_TIME,
                             locTime);

     errCode = X509_verify_cert(storeCtx.get());
     if (errCode == 1)
     {
         errCode = X509_V_OK;
     }
     else if (errCode == 0)
     {
         errCode = X509_STORE_CTX_get_error(storeCtx.get());
         log<level::ERR>("Certificate verification failed",
                         entry("FILE=%s", filePath.c_str()),
                         entry("ERRCODE=%d", errCode));
     }
     else
     {
         log<level::ERR>("Error occured during X509_verify_cert call",
                         entry("FILE=%s", filePath.c_str()));
         elog<InternalFailure>();
     }

     // Allow certificate upload, for "certificate is not yet valid" and
     // trust chain related errors.
     if (!((errCode == X509_V_OK) ||
           (errCode == X509_V_ERR_CERT_NOT_YET_VALID) ||
           TRUST_CHAIN_ERR(errCode)))
     {
         if (errCode == X509_V_ERR_CERT_HAS_EXPIRED)
         {
             elog<InvalidCertificate>(Reason("Expired Certificate"));
         }
         // Loging general error here.
         elog<InvalidCertificate>(Reason("Certificate validation failed"));
     }

     // Invoke type specific compare keys function.
     auto iter = typeFuncMap.find(certType);
     if (iter == typeFuncMap.end())
     {
         log<level::ERR>("Unsupported Type", entry("TYPE=%s", certType.c_str()));
         elog<InternalFailure>();
     }
     iter->second(filePath);

     // Copy thecertificate to the installation path
     auto path = fs::path(certInstallPath).parent_path();
     try
     {
         fs::create_directories(path);
         // During bootup will be parsing existing file so no need to
         // copy it.
         if (filePath != certInstallPath)
         {
             fs::copy_file(filePath, certInstallPath,
                           fs::copy_options::overwrite_existing);
         }
     }
     catch (fs::filesystem_error& e)
     {
         log<level::ERR>("Failed to copy certificate", entry("ERR=%s", e.what()),
                         entry("SRC=%s", filePath.c_str()),
                         entry("DST=%s", certInstallPath.c_str()));
         elog<InternalFailure>();
     }
     // restart the units
     if (!unitToRestart.empty())
     {
         reloadOrReset(unitToRestart);
     }

     // Parse the certificate file and populate properties
     populateProperties();
 }

 void Certificate::populateProperties()
 {
     X509_Ptr cert = std::move(loadCert(certInstallPath));
     // Update properties if no error thrown
     BIO_MEM_Ptr certBio(BIO_new(BIO_s_mem()), BIO_free);
     PEM_write_bio_X509(certBio.get(), cert.get());
     BUF_MEM_Ptr certBuf(BUF_MEM_new(), BUF_MEM_free);
     BUF_MEM* buf = certBuf.get();
     BIO_get_mem_ptr(certBio.get(), &buf);
     std::string certStr(buf->data, buf->length);
     CertificateIface::certificateString(certStr);

     static const int maxKeySize = 4096;
     char subBuffer[maxKeySize] = {0};
     // This pointer cannot be freed independantly.
     X509_NAME* sub = X509_get_subject_name(cert.get());
     X509_NAME_print_ex(certBio.get(), sub, 0, 0);
     BIO_read(certBio.get(), subBuffer, maxKeySize);
     CertificateIface::subject(subBuffer);

     // This pointer cannot be freed independantly.
     char issuerBuffer[maxKeySize] = {0};
     X509_NAME* issuer_name = X509_get_issuer_name(cert.get());
     X509_NAME_print_ex(certBio.get(), issuer_name, 0, 0);
     BIO_read(certBio.get(), issuerBuffer, maxKeySize);
     CertificateIface::issuer(issuerBuffer);

     std::vector<std::string> keyUsageList;
     ASN1_BIT_STRING* usage;

     // Go through each usage in the bit string and convert to
     // corresponding string value
     if ((usage = static_cast<ASN1_BIT_STRING*>(
              X509_get_ext_d2i(cert.get(), NID_key_usage, NULL, NULL))))
     {
         for (auto i = 0; i < usage->length; ++i)
         {
             for (auto& x : keyUsageToRfStr)
             {
                 if (x.first & usage->data[i])
                 {
                     keyUsageList.push_back(x.second);
                     break;
                 }
             }
         }
     }

     EXTENDED_KEY_USAGE* extUsage;
     if ((extUsage = static_cast<EXTENDED_KEY_USAGE*>(
              X509_get_ext_d2i(cert.get(), NID_ext_key_usage, NULL, NULL))))
     {
         for (int i = 0; i < sk_ASN1_OBJECT_num(extUsage); i++)
         {
             keyUsageList.push_back(extendedKeyUsageToRfStr[OBJ_obj2nid(
                 sk_ASN1_OBJECT_value(extUsage, i))]);
         }
     }
     CertificateIface::keyUsage(keyUsageList);

     int days = 0;
     int secs = 0;

     ASN1_TIME_ptr epoch(ASN1_TIME_new(), ASN1_STRING_free);
     // Set time to 12:00am GMT, Jan 1 1970
     ASN1_TIME_set_string(epoch.get(), "700101120000Z");

     static const int dayToSeconds = 24 * 60 * 60;
     ASN1_TIME* notAfter = X509_get_notAfter(cert.get());
     ASN1_TIME_diff(&days, &secs, epoch.get(), notAfter);
     CertificateIface::validNotAfter((days * dayToSeconds) + secs);

     ASN1_TIME* notBefore = X509_get_notBefore(cert.get());
     ASN1_TIME_diff(&days, &secs, epoch.get(), notBefore);
     CertificateIface::validNotBefore((days * dayToSeconds) + secs);
 }

 X509_Ptr Certificate::loadCert(const std::string& filePath)
 {
     log<level::INFO>("Certificate loadCert",
                      entry("FILEPATH=%s", filePath.c_str()));
     // Read Certificate file
     X509_Ptr cert(X509_new(), ::X509_free);
     if (!cert)
     {
         log<level::ERR>("Error occured during X509_new call",
                         entry("FILE=%s", filePath.c_str()),
                         entry("ERRCODE=%lu", ERR_get_error()));
         elog<InternalFailure>();
     }

     BIO_MEM_Ptr bioCert(BIO_new_file(filePath.c_str(), "rb"), ::BIO_free);
     if (!bioCert)
     {
         log<level::ERR>("Error occured during BIO_new_file call",
                         entry("FILE=%s", filePath.c_str()));
         elog<InternalFailure>();
     }

     X509* x509 = cert.get();
     if (!PEM_read_bio_X509(bioCert.get(), &x509, nullptr, nullptr))
     {
         log<level::ERR>("Error occured during PEM_read_bio_X509 call",
                         entry("FILE=%s", filePath.c_str()));
         elog<InternalFailure>();
     }
     return cert;
 }
 bool Certificate::compareKeys(const std::string& filePath)
 {
     log<level::INFO>("Certificate compareKeys",
                      entry("FILEPATH=%s", filePath.c_str()));
     X509_Ptr cert(X509_new(), ::X509_free);
     if (!cert)
     {
         log<level::ERR>("Error occured during X509_new call",
                         entry("FILE=%s", filePath.c_str()),
                         entry("ERRCODE=%lu", ERR_get_error()));
         elog<InternalFailure>();
     }

     BIO_MEM_Ptr bioCert(BIO_new_file(filePath.c_str(), "rb"), ::BIO_free);
     if (!bioCert)
     {
         log<level::ERR>("Error occured during BIO_new_file call",
                         entry("FILE=%s", filePath.c_str()));
         elog<InternalFailure>();
     }

     X509* x509 = cert.get();
     PEM_read_bio_X509(bioCert.get(), &x509, nullptr, nullptr);

     EVP_PKEY_Ptr pubKey(X509_get_pubkey(cert.get()), ::EVP_PKEY_free);
     if (!pubKey)
     {
         log<level::ERR>("Error occurred during X509_get_pubkey",
                         entry("FILE=%s", filePath.c_str()),
                         entry("ERRCODE=%lu", ERR_get_error()));
         elog<InvalidCertificate>(Reason("Failed to get public key info"));
     }

     BIO_MEM_Ptr keyBio(BIO_new(BIO_s_file()), ::BIO_free);
     if (!keyBio)
     {
         log<level::ERR>("Error occured during BIO_s_file call",
                         entry("FILE=%s", filePath.c_str()));
         elog<InternalFailure>();
     }
     BIO_read_filename(keyBio.get(), filePath.c_str());

     EVP_PKEY_Ptr priKey(
         PEM_read_bio_PrivateKey(keyBio.get(), nullptr, nullptr, nullptr),
         ::EVP_PKEY_free);
     if (!priKey)
     {
         log<level::ERR>("Error occurred during PEM_read_bio_PrivateKey",
                         entry("FILE=%s", filePath.c_str()),
                         entry("ERRCODE=%lu", ERR_get_error()));
         elog<InvalidCertificate>(Reason("Failed to get private key info"));
     }

     int32_t rc = EVP_PKEY_cmp(priKey.get(), pubKey.get());
     if (rc != 1)
     {
         log<level::ERR>("Private key is not matching with Certificate",
                         entry("FILE=%s", filePath.c_str()),
                         entry("ERRCODE=%d", rc));
         return false;
     }
     return true;
 }

 void Certificate::reloadOrReset(const UnitsToRestart& unit)
 {
     constexpr auto SYSTEMD_SERVICE = "org.freedesktop.systemd1";
     constexpr auto SYSTEMD_OBJ_PATH = "/org/freedesktop/systemd1";
     constexpr auto SYSTEMD_INTERFACE = "org.freedesktop.systemd1.Manager";
     try
     {
         auto method =
             bus.new_method_call(SYSTEMD_SERVICE, SYSTEMD_OBJ_PATH,
                                 SYSTEMD_INTERFACE, "ReloadOrRestartUnit");
         method.append(unit, "replace");
         bus.call_noreply(method);
     }
     catch (const sdbusplus::exception::SdBusError& e)
     {
         log<level::ERR>("Failed to reload or restart service",
                         entry("ERR=%s", e.what()),
                         entry("UNIT=%s", unit.c_str()));
         elog<InternalFailure>();
     }
 }
 } // namespace certs
 } // namespace phosphor
	#include "certificate.hpp"

	#include <openssl/bio.h>
	#include <openssl/crypto.h>
	#include <openssl/err.h>
	#include <openssl/evp.h>
	#include <openssl/pem.h>
	#include <openssl/x509v3.h>

	#include <fstream>
	#include <phosphor-logging/elog-errors.hpp>
	#include <xyz/openbmc_project/Certs/error.hpp>
	#include <xyz/openbmc_project/Common/error.hpp>

	namespace phosphor
	{
	namespace certs
	{
	// RAII support for openSSL functions.
	using BIO_MEM_Ptr = std::unique_ptr<BIO, decltype(&::BIO_free)>;
	using X509_STORE_CTX_Ptr =
	std::unique_ptr<X509_STORE_CTX, decltype(&::X509_STORE_CTX_free)>;
	using X509_LOOKUP_Ptr =
	std::unique_ptr<X509_LOOKUP, decltype(&::X509_LOOKUP_free)>;
	using ASN1_TIME_ptr = std::unique_ptr<ASN1_TIME, decltype(&ASN1_STRING_free)>;
	using EVP_PKEY_Ptr = std::unique_ptr<EVP_PKEY, decltype(&::EVP_PKEY_free)>;
	using BUF_MEM_Ptr = std::unique_ptr<BUF_MEM, decltype(&::BUF_MEM_free)>;
	using InternalFailure =
	sdbusplus::xyz::openbmc_project::Common::Error::InternalFailure;
	using InvalidCertificate =
	sdbusplus::xyz::openbmc_project::Certs::Error::InvalidCertificate;
	using Reason = xyz::openbmc_project::Certs::InvalidCertificate::REASON;

	// Trust chain related errors.`
	#define TRUST_CHAIN_ERR(errnum) \
	((errnum == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT) \|\| \
	(errnum == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN) \|\| \
	(errnum == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY) \|\| \
	(errnum == X509_V_ERR_CERT_UNTRUSTED) \|\| \
	(errnum == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE))

	// Refer to schema 2018.3
	// http://redfish.dmtf.org/schemas/v1/Certificate.json#/definitions/KeyUsage for
	// supported KeyUsage types in redfish
	// Refer to
	// https://github.com/openssl/openssl/blob/master/include/openssl/x509v3.h for
	// key usage bit fields
	std::map<uint8_t, std::string> keyUsageToRfStr = {
	{KU_DIGITAL_SIGNATURE, "DigitalSignature"},
	{KU_NON_REPUDIATION, "NonRepudiation"},
	{KU_KEY_ENCIPHERMENT, "KeyEncipherment"},
	{KU_DATA_ENCIPHERMENT, "DataEncipherment"},
	{KU_KEY_AGREEMENT, "KeyAgreement"},
	{KU_KEY_CERT_SIGN, "KeyCertSign"},
	{KU_CRL_SIGN, "CRLSigning"},
	{KU_ENCIPHER_ONLY, "EncipherOnly"},
	{KU_DECIPHER_ONLY, "DecipherOnly"}};

	// Refer to schema 2018.3
	// http://redfish.dmtf.org/schemas/v1/Certificate.json#/definitions/KeyUsage for
	// supported Extended KeyUsage types in redfish
	std::map<uint8_t, std::string> extendedKeyUsageToRfStr = {
	{NID_server_auth, "ServerAuthentication"},
	{NID_client_auth, "ClientAuthentication"},
	{NID_email_protect, "EmailProtection"},
	{NID_OCSP_sign, "OCSPSigning"},
	{NID_ad_timeStamping, "Timestamping"},
	{NID_code_sign, "CodeSigning"}};

	Certificate::Certificate(sdbusplus::bus::bus& bus, const std::string& objPath,
	const CertificateType& type,
	const UnitsToRestart& unit,
	const CertInstallPath& installPath,
	const CertUploadPath& uploadPath) :
	CertIfaces(bus, objPath.c_str(), true),
	bus(bus), objectPath(objPath), certType(type), unitToRestart(unit),
	certInstallPath(installPath)
	{
	auto installHelper = [this](const auto& filePath) {
	if (!compareKeys(filePath))
	{
	elog<InvalidCertificate>(
	Reason("Private key does not match the Certificate"));
	};
	};
	typeFuncMap[SERVER] = installHelper;
	typeFuncMap[CLIENT] = installHelper;
	typeFuncMap[AUTHORITY] = [](auto filePath) {};
	install(uploadPath);
	this->emit_object_added();
	}

	Certificate::~Certificate()
	{
	if (!fs::remove(certInstallPath))
	{
	log<level::INFO>("Certificate file not found!",
	entry("PATH=%s", certInstallPath.c_str()));
	}
	else if (!unitToRestart.empty())
	{
	reloadOrReset(unitToRestart);
	}
	}

	void Certificate::replace(const std::string filePath)
	{
	install(filePath);
	}

	void Certificate::install(const std::string& filePath)
	{
	log<level::INFO>("Certificate install ",
	entry("FILEPATH=%s", filePath.c_str()));
	auto errCode = X509_V_OK;

	// Verify the certificate file
	fs::path file(filePath);
	if (!fs::exists(file))
	{
	log<level::ERR>("File is Missing", entry("FILE=%s", filePath.c_str()));
	elog<InternalFailure>();
	}

	try
	{
	if (fs::file_size(filePath) == 0)
	{
	// file is empty
	log<level::ERR>("File is empty",
	entry("FILE=%s", filePath.c_str()));
	elog<InvalidCertificate>(Reason("File is empty"));
	}
	}
	catch (const fs::filesystem_error& e)
	{
	// Log Error message
	log<level::ERR>(e.what(), entry("FILE=%s", filePath.c_str()));
	elog<InternalFailure>();
	}

	// Defining store object as RAW to avoid double free.
	// X509_LOOKUP_free free up store object.
	// Create an empty X509_STORE structure for certificate validation.
	auto x509Store = X509_STORE_new();
	if (!x509Store)
	{
	log<level::ERR>("Error occured during X509_STORE_new call");
	elog<InternalFailure>();
	}

	OpenSSL_add_all_algorithms();

	// ADD Certificate Lookup method.
	X509_LOOKUP_Ptr lookup(X509_STORE_add_lookup(x509Store, X509_LOOKUP_file()),
	::X509_LOOKUP_free);
	if (!lookup)
	{
	// Normally lookup cleanup function interanlly does X509Store cleanup
	// Free up the X509Store.
	X509_STORE_free(x509Store);
	log<level::ERR>("Error occured during X509_STORE_add_lookup call");
	elog<InternalFailure>();
	}
	// Load Certificate file.
	errCode = X509_LOOKUP_load_file(lookup.get(), filePath.c_str(),
	X509_FILETYPE_PEM);
	if (errCode != 1)
	{
	log<level::ERR>("Error occured during X509_LOOKUP_load_file call",
	entry("FILE=%s", filePath.c_str()));
	elog<InvalidCertificate>(Reason("Invalid certificate file format"));
	}

	// Load Certificate file into the X509 structre.
	X509_Ptr cert = std::move(loadCert(filePath));
	X509_STORE_CTX_Ptr storeCtx(X509_STORE_CTX_new(), ::X509_STORE_CTX_free);
	if (!storeCtx)
	{
	log<level::ERR>("Error occured during X509_STORE_CTX_new call",
	entry("FILE=%s", filePath.c_str()));
	elog<InternalFailure>();
	}

	errCode = X509_STORE_CTX_init(storeCtx.get(), x509Store, cert.get(), NULL);
	if (errCode != 1)
	{
	log<level::ERR>("Error occured during X509_STORE_CTX_init call",
	entry("FILE=%s", filePath.c_str()));
	elog<InternalFailure>();
	}

	// Set time to current time.
	auto locTime = time(nullptr);

	X509_STORE_CTX_set_time(storeCtx.get(), X509_V_FLAG_USE_CHECK_TIME,
	locTime);

	errCode = X509_verify_cert(storeCtx.get());
	if (errCode == 1)
	{
	errCode = X509_V_OK;
	}
	else if (errCode == 0)
	{
	errCode = X509_STORE_CTX_get_error(storeCtx.get());
	log<level::ERR>("Certificate verification failed",
	entry("FILE=%s", filePath.c_str()),
	entry("ERRCODE=%d", errCode));
	}
	else
	{
	log<level::ERR>("Error occured during X509_verify_cert call",
	entry("FILE=%s", filePath.c_str()));
	elog<InternalFailure>();
	}

	// Allow certificate upload, for "certificate is not yet valid" and
	// trust chain related errors.
	if (!((errCode == X509_V_OK) \|\|
	(errCode == X509_V_ERR_CERT_NOT_YET_VALID) \|\|
	TRUST_CHAIN_ERR(errCode)))
	{
	if (errCode == X509_V_ERR_CERT_HAS_EXPIRED)
	{
	elog<InvalidCertificate>(Reason("Expired Certificate"));
	}
	// Loging general error here.
	elog<InvalidCertificate>(Reason("Certificate validation failed"));
	}

	// Invoke type specific compare keys function.
	auto iter = typeFuncMap.find(certType);
	if (iter == typeFuncMap.end())
	{
	log<level::ERR>("Unsupported Type", entry("TYPE=%s", certType.c_str()));
	elog<InternalFailure>();
	}
	iter->second(filePath);

	// Copy thecertificate to the installation path
	auto path = fs::path(certInstallPath).parent_path();
	try
	{
	fs::create_directories(path);
	// During bootup will be parsing existing file so no need to
	// copy it.
	if (filePath != certInstallPath)
	{
	fs::copy_file(filePath, certInstallPath,
	fs::copy_options::overwrite_existing);
	}
	}
	catch (fs::filesystem_error& e)
	{
	log<level::ERR>("Failed to copy certificate", entry("ERR=%s", e.what()),
	entry("SRC=%s", filePath.c_str()),
	entry("DST=%s", certInstallPath.c_str()));
	elog<InternalFailure>();
	}
	// restart the units
	if (!unitToRestart.empty())
	{
	reloadOrReset(unitToRestart);
	}

	// Parse the certificate file and populate properties
	populateProperties();
	}

	void Certificate::populateProperties()
	{
	X509_Ptr cert = std::move(loadCert(certInstallPath));
	// Update properties if no error thrown
	BIO_MEM_Ptr certBio(BIO_new(BIO_s_mem()), BIO_free);
	PEM_write_bio_X509(certBio.get(), cert.get());
	BUF_MEM_Ptr certBuf(BUF_MEM_new(), BUF_MEM_free);
	BUF_MEM* buf = certBuf.get();
	BIO_get_mem_ptr(certBio.get(), &buf);
	std::string certStr(buf->data, buf->length);
	CertificateIface::certificateString(certStr);

	static const int maxKeySize = 4096;
	char subBuffer[maxKeySize] = {0};
	// This pointer cannot be freed independantly.
	X509_NAME* sub = X509_get_subject_name(cert.get());
	X509_NAME_print_ex(certBio.get(), sub, 0, 0);
	BIO_read(certBio.get(), subBuffer, maxKeySize);
	CertificateIface::subject(subBuffer);

	// This pointer cannot be freed independantly.
	char issuerBuffer[maxKeySize] = {0};
	X509_NAME* issuer_name = X509_get_issuer_name(cert.get());
	X509_NAME_print_ex(certBio.get(), issuer_name, 0, 0);
	BIO_read(certBio.get(), issuerBuffer, maxKeySize);
	CertificateIface::issuer(issuerBuffer);

	std::vector<std::string> keyUsageList;
	ASN1_BIT_STRING* usage;

	// Go through each usage in the bit string and convert to
	// corresponding string value
	if ((usage = static_cast<ASN1_BIT_STRING*>(
	X509_get_ext_d2i(cert.get(), NID_key_usage, NULL, NULL))))
	{
	for (auto i = 0; i < usage->length; ++i)
	{
	for (auto& x : keyUsageToRfStr)
	{
	if (x.first & usage->data[i])
	{
	keyUsageList.push_back(x.second);
	break;
	}
	}
	}
	}

	EXTENDED_KEY_USAGE* extUsage;
	if ((extUsage = static_cast<EXTENDED_KEY_USAGE*>(
	X509_get_ext_d2i(cert.get(), NID_ext_key_usage, NULL, NULL))))
	{
	for (int i = 0; i < sk_ASN1_OBJECT_num(extUsage); i++)
	{
	keyUsageList.push_back(extendedKeyUsageToRfStr[OBJ_obj2nid(
	sk_ASN1_OBJECT_value(extUsage, i))]);
	}
	}
	CertificateIface::keyUsage(keyUsageList);

	int days = 0;
	int secs = 0;

	ASN1_TIME_ptr epoch(ASN1_TIME_new(), ASN1_STRING_free);
	// Set time to 12:00am GMT, Jan 1 1970
	ASN1_TIME_set_string(epoch.get(), "700101120000Z");

	static const int dayToSeconds = 24 * 60 * 60;
	ASN1_TIME* notAfter = X509_get_notAfter(cert.get());
	ASN1_TIME_diff(&days, &secs, epoch.get(), notAfter);
	CertificateIface::validNotAfter((days * dayToSeconds) + secs);

	ASN1_TIME* notBefore = X509_get_notBefore(cert.get());
	ASN1_TIME_diff(&days, &secs, epoch.get(), notBefore);
	CertificateIface::validNotBefore((days * dayToSeconds) + secs);
	}

	X509_Ptr Certificate::loadCert(const std::string& filePath)
	{
	log<level::INFO>("Certificate loadCert",
	entry("FILEPATH=%s", filePath.c_str()));
	// Read Certificate file
	X509_Ptr cert(X509_new(), ::X509_free);
	if (!cert)
	{
	log<level::ERR>("Error occured during X509_new call",
	entry("FILE=%s", filePath.c_str()),
	entry("ERRCODE=%lu", ERR_get_error()));
	elog<InternalFailure>();
	}

	BIO_MEM_Ptr bioCert(BIO_new_file(filePath.c_str(), "rb"), ::BIO_free);
	if (!bioCert)
	{
	log<level::ERR>("Error occured during BIO_new_file call",
	entry("FILE=%s", filePath.c_str()));
	elog<InternalFailure>();
	}

	X509* x509 = cert.get();
	if (!PEM_read_bio_X509(bioCert.get(), &x509, nullptr, nullptr))
	{
	log<level::ERR>("Error occured during PEM_read_bio_X509 call",
	entry("FILE=%s", filePath.c_str()));
	elog<InternalFailure>();
	}
	return cert;
	}
	bool Certificate::compareKeys(const std::string& filePath)
	{
	log<level::INFO>("Certificate compareKeys",
	entry("FILEPATH=%s", filePath.c_str()));
	X509_Ptr cert(X509_new(), ::X509_free);
	if (!cert)
	{
	log<level::ERR>("Error occured during X509_new call",
	entry("FILE=%s", filePath.c_str()),
	entry("ERRCODE=%lu", ERR_get_error()));
	elog<InternalFailure>();
	}

	BIO_MEM_Ptr bioCert(BIO_new_file(filePath.c_str(), "rb"), ::BIO_free);
	if (!bioCert)
	{
	log<level::ERR>("Error occured during BIO_new_file call",
	entry("FILE=%s", filePath.c_str()));
	elog<InternalFailure>();
	}

	X509* x509 = cert.get();
	PEM_read_bio_X509(bioCert.get(), &x509, nullptr, nullptr);

	EVP_PKEY_Ptr pubKey(X509_get_pubkey(cert.get()), ::EVP_PKEY_free);
	if (!pubKey)
	{
	log<level::ERR>("Error occurred during X509_get_pubkey",
	entry("FILE=%s", filePath.c_str()),
	entry("ERRCODE=%lu", ERR_get_error()));
	elog<InvalidCertificate>(Reason("Failed to get public key info"));
	}

	BIO_MEM_Ptr keyBio(BIO_new(BIO_s_file()), ::BIO_free);
	if (!keyBio)
	{
	log<level::ERR>("Error occured during BIO_s_file call",
	entry("FILE=%s", filePath.c_str()));
	elog<InternalFailure>();
	}
	BIO_read_filename(keyBio.get(), filePath.c_str());

	EVP_PKEY_Ptr priKey(
	PEM_read_bio_PrivateKey(keyBio.get(), nullptr, nullptr, nullptr),
	::EVP_PKEY_free);
	if (!priKey)
	{
	log<level::ERR>("Error occurred during PEM_read_bio_PrivateKey",
	entry("FILE=%s", filePath.c_str()),
	entry("ERRCODE=%lu", ERR_get_error()));
	elog<InvalidCertificate>(Reason("Failed to get private key info"));
	}

	int32_t rc = EVP_PKEY_cmp(priKey.get(), pubKey.get());
	if (rc != 1)
	{
	log<level::ERR>("Private key is not matching with Certificate",
	entry("FILE=%s", filePath.c_str()),
	entry("ERRCODE=%d", rc));
	return false;
	}
	return true;
	}

	void Certificate::reloadOrReset(const UnitsToRestart& unit)
	{
	constexpr auto SYSTEMD_SERVICE = "org.freedesktop.systemd1";
	constexpr auto SYSTEMD_OBJ_PATH = "/org/freedesktop/systemd1";
	constexpr auto SYSTEMD_INTERFACE = "org.freedesktop.systemd1.Manager";
	try
	{
	auto method =
	bus.new_method_call(SYSTEMD_SERVICE, SYSTEMD_OBJ_PATH,
	SYSTEMD_INTERFACE, "ReloadOrRestartUnit");
	method.append(unit, "replace");
	bus.call_noreply(method);
	}
	catch (const sdbusplus::exception::SdBusError& e)
	{
	log<level::ERR>("Failed to reload or restart service",
	entry("ERR=%s", e.what()),
	entry("UNIT=%s", unit.c_str()));
	elog<InternalFailure>();
	}
	}
	} // namespace certs
	} // namespace phosphor