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

 #include "certs_manager.hpp"

 #include <openssl/pem.h>
 #include <unistd.h>

 #include <phosphor-logging/elog-errors.hpp>
 #include <xyz/openbmc_project/Certs/error.hpp>
 #include <xyz/openbmc_project/Common/error.hpp>
 namespace phosphor
 {
 namespace certs
 {
 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;

 using X509_REQ_Ptr = std::unique_ptr<X509_REQ, decltype(&::X509_REQ_free)>;
 using BIGNUM_Ptr = std::unique_ptr<BIGNUM, decltype(&::BN_free)>;
 using InvalidArgument =
     sdbusplus::xyz::openbmc_project::Common::Error::InvalidArgument;
 using Argument = xyz::openbmc_project::Common::InvalidArgument;

 constexpr auto SUPPORTED_KEYBITLENGTH = 2048;

 Manager::Manager(sdbusplus::bus::bus& bus, sdeventplus::Event& event,
                  const char* path, const CertificateType& type,
                  UnitsToRestart&& unit, CertInstallPath&& installPath) :
     Ifaces(bus, path),
     bus(bus), event(event), objectPath(path), certType(type),
     unitToRestart(std::move(unit)), certInstallPath(std::move(installPath)),
     certParentInstallPath(fs::path(certInstallPath).parent_path())
 {
     // create parent certificate path if not existing
     try
     {
         if (!fs::exists(certParentInstallPath))
         {
             fs::create_directories(certParentInstallPath);
         }
     }
     catch (fs::filesystem_error& e)
     {
         log<level::ERR>("Failed to create directory", entry("ERR=%s", e.what()),
                         entry("DIRECTORY=%s", certParentInstallPath.c_str()));
         report<InternalFailure>();
     }

     // Generating RSA private key file if certificate type is server/client
     if (certType != AUTHORITY)
     {
         createRSAPrivateKeyFile();
     }

     // restore any existing certificates
     if (fs::exists(certInstallPath))
     {
         createCertificate();
     }

     // watch is not required for authority certificates
     if (certType != AUTHORITY)
     {
         // watch for certificate file create/replace
         certWatchPtr = std::make_unique<
             Watch>(event, certInstallPath, [this]() {
             try
             {
                 // if certificate file existing update it
                 if (certificatePtr != nullptr)
                 {
                     log<level::INFO>(
                         "Inotify callback to update certificate properties");
                     certificatePtr->populateProperties();
                 }
                 else
                 {
                     log<level::INFO>(
                         "Inotify callback to create certificate object");
                     createCertificate();
                 }
             }
             catch (const InternalFailure& e)
             {
                 commit<InternalFailure>();
             }
             catch (const InvalidCertificate& e)
             {
                 commit<InvalidCertificate>();
             }
         });
     }
 }

 std::string Manager::install(const std::string filePath)
 {
     using NotAllowed =
         sdbusplus::xyz::openbmc_project::Common::Error::NotAllowed;
     using Reason = xyz::openbmc_project::Common::NotAllowed::REASON;
     // TODO: Issue#3 At present supporting only one certificate to be
     // uploaded this need to be revisited to support multiple
     // certificates
     if (certificatePtr != nullptr)
     {
         elog<NotAllowed>(Reason("Certificate already exist"));
     }

     auto certObjectPath = objectPath + '/' + '1';
     certificatePtr = std::make_unique<Certificate>(
         bus, certObjectPath, certType, unitToRestart, certInstallPath, filePath,
         false, certWatchPtr);
     return certObjectPath;
 }

 void Manager::delete_()
 {
     // TODO: #Issue 4 when a certificate is deleted system auto generates
     // certificate file. At present we are not supporting creation of
     // certificate object for the auto-generated certificate file as
     // deletion if only applicable for REST server and Bmcweb does not allow
     // deletion of certificates
     if (certificatePtr != nullptr)
     {
         certificatePtr.reset(nullptr);
     }
 }

 std::string Manager::generateCSR(
     std::vector<std::string> alternativeNames, std::string challengePassword,
     std::string city, std::string commonName, std::string contactPerson,
     std::string country, std::string email, std::string givenName,
     std::string initials, int64_t keyBitLength, std::string keyCurveId,
     std::string keyPairAlgorithm, std::vector<std::string> keyUsage,
     std::string organization, std::string organizationalUnit, std::string state,
     std::string surname, std::string unstructuredName)
 {
     // We support only one CSR.
     csrPtr.reset(nullptr);
     auto pid = fork();
     if (pid == -1)
     {
         log<level::ERR>("Error occurred during forking process");
         report<InternalFailure>();
     }
     else if (pid == 0)
     {
         try
         {
             generateCSRHelper(alternativeNames, challengePassword, city,
                               commonName, contactPerson, country, email,
                               givenName, initials, keyBitLength, keyCurveId,
                               keyPairAlgorithm, keyUsage, organization,
                               organizationalUnit, state, surname,
                               unstructuredName);
             exit(EXIT_SUCCESS);
         }
         catch (const InternalFailure& e)
         {
             // commit the error reported in child process and exit
             // Callback method from SDEvent Loop looks for exit status
             exit(EXIT_FAILURE);
             commit<InternalFailure>();
         }
     }
     else
     {
         using namespace sdeventplus::source;
         Child::Callback callback = [this](Child& eventSource,
                                           const siginfo_t* si) {
             eventSource.set_enabled(Enabled::On);
             if (si->si_status != 0)
             {
                 this->createCSRObject(Status::FAILURE);
             }
             else
             {
                 this->createCSRObject(Status::SUCCESS);
             }
         };
         try
         {
             sigset_t ss;
             if (sigemptyset(&ss) < 0)
             {
                 log<level::ERR>("Unable to initialize signal set");
                 elog<InternalFailure>();
             }
             if (sigaddset(&ss, SIGCHLD) < 0)
             {
                 log<level::ERR>("Unable to add signal to signal set");
                 elog<InternalFailure>();
             }

             // Block SIGCHLD first, so that the event loop can handle it
             if (sigprocmask(SIG_BLOCK, &ss, NULL) < 0)
             {
                 log<level::ERR>("Unable to block signal");
                 elog<InternalFailure>();
             }
             if (childPtr)
             {
                 childPtr.reset();
             }
             childPtr = std::make_unique<Child>(event, pid, WEXITED | WSTOPPED,
                                                std::move(callback));
         }
         catch (const InternalFailure& e)
         {
             commit<InternalFailure>();
         }
     }
     auto csrObjectPath = objectPath + '/' + "csr";
     return csrObjectPath;
 }

 CertificatePtr& Manager::getCertificate()
 {
     return certificatePtr;
 }

 void Manager::generateCSRHelper(
     std::vector<std::string> alternativeNames, std::string challengePassword,
     std::string city, std::string commonName, std::string contactPerson,
     std::string country, std::string email, std::string givenName,
     std::string initials, int64_t keyBitLength, std::string keyCurveId,
     std::string keyPairAlgorithm, std::vector<std::string> keyUsage,
     std::string organization, std::string organizationalUnit, std::string state,
     std::string surname, std::string unstructuredName)
 {
     int ret = 0;

     // set version of x509 req
     int nVersion = 1;
     // TODO: Issue#6 need to make version number configurable
     X509_REQ_Ptr x509Req(X509_REQ_new(), ::X509_REQ_free);
     ret = X509_REQ_set_version(x509Req.get(), nVersion);
     if (ret == 0)
     {
         log<level::ERR>("Error occured during X509_REQ_set_version call");
         elog<InternalFailure>();
     }

     // set subject of x509 req
     X509_NAME* x509Name = X509_REQ_get_subject_name(x509Req.get());

     if (!alternativeNames.empty())
     {
         for (auto& name : alternativeNames)
         {
             addEntry(x509Name, "subjectAltName", name);
         }
     }
     addEntry(x509Name, "challengePassword", challengePassword);
     addEntry(x509Name, "L", city);
     addEntry(x509Name, "CN", commonName);
     addEntry(x509Name, "name", contactPerson);
     addEntry(x509Name, "C", country);
     addEntry(x509Name, "emailAddress", email);
     addEntry(x509Name, "GN", givenName);
     addEntry(x509Name, "initials", initials);
     addEntry(x509Name, "algorithm", keyPairAlgorithm);
     if (!keyUsage.empty())
     {
         for (auto& usage : keyUsage)
         {
             if (isExtendedKeyUsage(usage))
             {
                 addEntry(x509Name, "extendedKeyUsage", usage);
             }
             else
             {
                 addEntry(x509Name, "keyUsage", usage);
             }
         }
     }
     addEntry(x509Name, "O", organization);
     addEntry(x509Name, "ST", state);
     addEntry(x509Name, "SN", surname);
     addEntry(x509Name, "unstructuredName", unstructuredName);

     EVP_PKEY_Ptr pKey(nullptr, ::EVP_PKEY_free);

     log<level::INFO>("Given Key pair algorithm",
                      entry("KEYPAIRALGORITHM=%s", keyPairAlgorithm.c_str()));

     // Used EC algorithm as default if user did not give algorithm type.
     if (keyPairAlgorithm == "RSA")
         pKey = getRSAKeyPair(keyBitLength);
     else if ((keyPairAlgorithm == "EC") || (keyPairAlgorithm.empty()))
         pKey = generateECKeyPair(keyCurveId);
     else
     {
         log<level::ERR>("Given Key pair algorithm is not supported. Supporting "
                         "RSA and EC only");
         elog<InvalidArgument>(
             Argument::ARGUMENT_NAME("KEYPAIRALGORITHM"),
             Argument::ARGUMENT_VALUE(keyPairAlgorithm.c_str()));
     }

     ret = X509_REQ_set_pubkey(x509Req.get(), pKey.get());
     if (ret == 0)
     {
         log<level::ERR>("Error occured while setting Public key");
         elog<InternalFailure>();
     }

     // Write private key to file
     writePrivateKey(pKey, PRIV_KEY_FILE_NAME);

     // set sign key of x509 req
     ret = X509_REQ_sign(x509Req.get(), pKey.get(), EVP_sha256());
     if (ret == 0)
     {
         log<level::ERR>("Error occured while signing key of x509");
         elog<InternalFailure>();
     }

     log<level::INFO>("Writing CSR to file");
     fs::path csrFilePath = certParentInstallPath / CSR_FILE_NAME;
     writeCSR(csrFilePath.string(), x509Req);
 }

 bool Manager::isExtendedKeyUsage(const std::string& usage)
 {
     const static std::array<const char*, 6> usageList = {
         "ServerAuthentication", "ClientAuthentication", "OCSPSigning",
         "Timestamping",         "CodeSigning",          "EmailProtection"};
     auto it = std::find_if(
         usageList.begin(), usageList.end(),
         [&usage](const char* s) { return (strcmp(s, usage.c_str()) == 0); });
     return it != usageList.end();
 }
 EVP_PKEY_Ptr Manager::generateRSAKeyPair(const int64_t keyBitLength)
 {
     int ret = 0;
     // generate rsa key
     BIGNUM_Ptr bne(BN_new(), ::BN_free);
     ret = BN_set_word(bne.get(), RSA_F4);
     if (ret == 0)
     {
         log<level::ERR>("Error occured during BN_set_word call");
         elog<InternalFailure>();
     }

     int64_t keyBitLen = keyBitLength;
     // set keybit length to default value if not set
     if (keyBitLen <= 0)
     {
         constexpr auto DEFAULT_KEYBITLENGTH = 2048;
         log<level::INFO>(
             "KeyBitLength is not given.Hence, using default KeyBitLength",
             entry("DEFAULTKEYBITLENGTH=%d", DEFAULT_KEYBITLENGTH));
         keyBitLen = DEFAULT_KEYBITLENGTH;
     }
     RSA* rsa = RSA_new();
     ret = RSA_generate_key_ex(rsa, keyBitLen, bne.get(), NULL);
     if (ret != 1)
     {
         free(rsa);
         log<level::ERR>("Error occured during RSA_generate_key_ex call",
                         entry("KEYBITLENGTH=%PRIu64", keyBitLen));
         elog<InternalFailure>();
     }

     // set public key of x509 req
     EVP_PKEY_Ptr pKey(EVP_PKEY_new(), ::EVP_PKEY_free);
     ret = EVP_PKEY_assign_RSA(pKey.get(), rsa);
     if (ret == 0)
     {
         free(rsa);
         log<level::ERR>("Error occured during assign rsa key into EVP");
         elog<InternalFailure>();
     }

     return pKey;
 }

 EVP_PKEY_Ptr Manager::generateECKeyPair(const std::string& curveId)
 {
     std::string curId(curveId);

     if (curId.empty())
     {
         // secp224r1 is equal to RSA 2048 KeyBitLength. Refer RFC 5349
         constexpr auto DEFAULT_KEYCURVEID = "secp224r1";
         log<level::INFO>(
             "KeyCurveId is not given. Hence using default curve id",
             entry("DEFAULTKEYCURVEID=%s", DEFAULT_KEYCURVEID));
         curId = DEFAULT_KEYCURVEID;
     }

     int ecGrp = OBJ_txt2nid(curId.c_str());

     if (ecGrp == NID_undef)
     {
         log<level::ERR>(
             "Error occured during convert the curve id string format into NID",
             entry("KEYCURVEID=%s", curId.c_str()));
         elog<InternalFailure>();
     }

     EC_KEY* ecKey = EC_KEY_new_by_curve_name(ecGrp);

     if (ecKey == NULL)
     {
         log<level::ERR>(
             "Error occured during create the EC_Key object from NID",
             entry("ECGROUP=%d", ecGrp));
         elog<InternalFailure>();
     }

     // If you want to save a key and later load it with
     // SSL_CTX_use_PrivateKey_file, then you must set the OPENSSL_EC_NAMED_CURVE
     // flag on the key.
     EC_KEY_set_asn1_flag(ecKey, OPENSSL_EC_NAMED_CURVE);

     int ret = EC_KEY_generate_key(ecKey);

     if (ret == 0)
     {
         EC_KEY_free(ecKey);
         log<level::ERR>("Error occured during generate EC key");
         elog<InternalFailure>();
     }

     EVP_PKEY_Ptr pKey(EVP_PKEY_new(), ::EVP_PKEY_free);
     ret = EVP_PKEY_assign_EC_KEY(pKey.get(), ecKey);
     if (ret == 0)
     {
         EC_KEY_free(ecKey);
         log<level::ERR>("Error occured during assign EC Key into EVP");
         elog<InternalFailure>();
     }

     return pKey;
 }

 void Manager::writePrivateKey(const EVP_PKEY_Ptr& pKey,
                               const std::string& privKeyFileName)
 {
     log<level::INFO>("Writing private key to file");
     // write private key to file
     fs::path privKeyPath = certParentInstallPath / privKeyFileName;

     FILE* fp = std::fopen(privKeyPath.c_str(), "w");
     if (fp == NULL)
     {
         log<level::ERR>("Error occured creating private key file");
         elog<InternalFailure>();
     }
     int ret = PEM_write_PrivateKey(fp, pKey.get(), NULL, NULL, 0, 0, NULL);
     std::fclose(fp);
     if (ret == 0)
     {
         log<level::ERR>("Error occured while writing private key to file");
         elog<InternalFailure>();
     }
 }

 void Manager::addEntry(X509_NAME* x509Name, const char* field,
                        const std::string& bytes)
 {
     if (bytes.empty())
     {
         return;
     }
     int ret = X509_NAME_add_entry_by_txt(
         x509Name, field, MBSTRING_ASC,
         reinterpret_cast<const unsigned char*>(bytes.c_str()), -1, -1, 0);
     if (ret != 1)
     {
         log<level::ERR>("Unable to set entry", entry("FIELD=%s", field),
                         entry("VALUE=%s", bytes.c_str()));
         elog<InternalFailure>();
     }
 }

 void Manager::createCSRObject(const Status& status)
 {
     if (csrPtr)
     {
         csrPtr.reset(nullptr);
     }
     auto csrObjectPath = objectPath + '/' + "csr";
     csrPtr = std::make_unique<CSR>(bus, csrObjectPath.c_str(),
                                    certInstallPath.c_str(), status);
 }

 void Manager::writeCSR(const std::string& filePath, const X509_REQ_Ptr& x509Req)
 {
     if (fs::exists(filePath))
     {
         log<level::INFO>("Removing the existing file",
                          entry("FILENAME=%s", filePath.c_str()));
         if (!fs::remove(filePath.c_str()))
         {
             log<level::ERR>("Unable to remove the file",
                             entry("FILENAME=%s", filePath.c_str()));
             elog<InternalFailure>();
         }
     }

     FILE* fp = NULL;

     if ((fp = std::fopen(filePath.c_str(), "w")) == NULL)
     {
         log<level::ERR>("Error opening the file to write the CSR",
                         entry("FILENAME=%s", filePath.c_str()));
         elog<InternalFailure>();
     }

     int rc = PEM_write_X509_REQ(fp, x509Req.get());
     if (!rc)
     {
         log<level::ERR>("PEM write routine failed",
                         entry("FILENAME=%s", filePath.c_str()));
         std::fclose(fp);
         elog<InternalFailure>();
     }
     std::fclose(fp);
 }

 void Manager::createCertificate()
 {
     try
     {
         // TODO: Issue#3 At present supporting only one certificate to be
         // uploaded this need to be revisited to support multiple
         // certificates
         auto certObjectPath = objectPath + '/' + '1';
         certificatePtr = std::make_unique<Certificate>(
             bus, certObjectPath, certType, unitToRestart, certInstallPath,
             certInstallPath, true, certWatchPtr);
     }
     catch (const InternalFailure& e)
     {
         report<InternalFailure>();
     }
     catch (const InvalidCertificate& e)
     {
         report<InvalidCertificate>(
             Reason("Existing certificate file is corrupted"));
     }
 }

 void Manager::createRSAPrivateKeyFile()
 {
     fs::path rsaPrivateKeyFileName =
         certParentInstallPath / RSA_PRIV_KEY_FILE_NAME;

     try
     {
         if (!fs::exists(rsaPrivateKeyFileName))
         {
             writePrivateKey(generateRSAKeyPair(SUPPORTED_KEYBITLENGTH),
                             RSA_PRIV_KEY_FILE_NAME);
         }
     }
     catch (const InternalFailure& e)
     {
         report<InternalFailure>();
     }
 }

 EVP_PKEY_Ptr Manager::getRSAKeyPair(const int64_t keyBitLength)
 {
     if (keyBitLength != SUPPORTED_KEYBITLENGTH)
     {
         log<level::ERR>(
             "Given Key bit length is not supported",
             entry("GIVENKEYBITLENGTH=%d", keyBitLength),
             entry("SUPPORTEDKEYBITLENGTH=%d", SUPPORTED_KEYBITLENGTH));
         elog<InvalidArgument>(
             Argument::ARGUMENT_NAME("KEYBITLENGTH"),
             Argument::ARGUMENT_VALUE(std::to_string(keyBitLength).c_str()));
     }
     fs::path rsaPrivateKeyFileName =
         certParentInstallPath / RSA_PRIV_KEY_FILE_NAME;

     FILE* privateKeyFile = std::fopen(rsaPrivateKeyFileName.c_str(), "r");
     if (!privateKeyFile)
     {
         log<level::ERR>("Unable to open RSA private key file to read",
                         entry("RSAKEYFILE=%s", rsaPrivateKeyFileName.c_str()),
                         entry("ERRORREASON=%s", strerror(errno)));
         elog<InternalFailure>();
     }

     EVP_PKEY_Ptr privateKey(
         PEM_read_PrivateKey(privateKeyFile, nullptr, nullptr, nullptr),
         ::EVP_PKEY_free);
     std::fclose(privateKeyFile);

     if (!privateKey)
     {
         log<level::ERR>("Error occured during PEM_read_PrivateKey call");
         elog<InternalFailure>();
     }
     return privateKey;
 }
 } // namespace certs
 } // namespace phosphor
	#include "certs_manager.hpp"

	#include <openssl/pem.h>
	#include <unistd.h>

	#include <phosphor-logging/elog-errors.hpp>
	#include <xyz/openbmc_project/Certs/error.hpp>
	#include <xyz/openbmc_project/Common/error.hpp>
	namespace phosphor
	{
	namespace certs
	{
	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;

	using X509_REQ_Ptr = std::unique_ptr<X509_REQ, decltype(&::X509_REQ_free)>;
	using BIGNUM_Ptr = std::unique_ptr<BIGNUM, decltype(&::BN_free)>;
	using InvalidArgument =
	sdbusplus::xyz::openbmc_project::Common::Error::InvalidArgument;
	using Argument = xyz::openbmc_project::Common::InvalidArgument;

	constexpr auto SUPPORTED_KEYBITLENGTH = 2048;

	Manager::Manager(sdbusplus::bus::bus& bus, sdeventplus::Event& event,
	const char* path, const CertificateType& type,
	UnitsToRestart&& unit, CertInstallPath&& installPath) :
	Ifaces(bus, path),
	bus(bus), event(event), objectPath(path), certType(type),
	unitToRestart(std::move(unit)), certInstallPath(std::move(installPath)),
	certParentInstallPath(fs::path(certInstallPath).parent_path())
	{
	// create parent certificate path if not existing
	try
	{
	if (!fs::exists(certParentInstallPath))
	{
	fs::create_directories(certParentInstallPath);
	}
	}
	catch (fs::filesystem_error& e)
	{
	log<level::ERR>("Failed to create directory", entry("ERR=%s", e.what()),
	entry("DIRECTORY=%s", certParentInstallPath.c_str()));
	report<InternalFailure>();
	}

	// Generating RSA private key file if certificate type is server/client
	if (certType != AUTHORITY)
	{
	createRSAPrivateKeyFile();
	}

	// restore any existing certificates
	if (fs::exists(certInstallPath))
	{
	createCertificate();
	}

	// watch is not required for authority certificates
	if (certType != AUTHORITY)
	{
	// watch for certificate file create/replace
	certWatchPtr = std::make_unique<
	Watch>(event, certInstallPath, [this]() {
	try
	{
	// if certificate file existing update it
	if (certificatePtr != nullptr)
	{
	log<level::INFO>(
	"Inotify callback to update certificate properties");
	certificatePtr->populateProperties();
	}
	else
	{
	log<level::INFO>(
	"Inotify callback to create certificate object");
	createCertificate();
	}
	}
	catch (const InternalFailure& e)
	{
	commit<InternalFailure>();
	}
	catch (const InvalidCertificate& e)
	{
	commit<InvalidCertificate>();
	}
	});
	}
	}

	std::string Manager::install(const std::string filePath)
	{
	using NotAllowed =
	sdbusplus::xyz::openbmc_project::Common::Error::NotAllowed;
	using Reason = xyz::openbmc_project::Common::NotAllowed::REASON;
	// TODO: Issue#3 At present supporting only one certificate to be
	// uploaded this need to be revisited to support multiple
	// certificates
	if (certificatePtr != nullptr)
	{
	elog<NotAllowed>(Reason("Certificate already exist"));
	}

	auto certObjectPath = objectPath + '/' + '1';
	certificatePtr = std::make_unique<Certificate>(
	bus, certObjectPath, certType, unitToRestart, certInstallPath, filePath,
	false, certWatchPtr);
	return certObjectPath;
	}

	void Manager::delete_()
	{
	// TODO: #Issue 4 when a certificate is deleted system auto generates
	// certificate file. At present we are not supporting creation of
	// certificate object for the auto-generated certificate file as
	// deletion if only applicable for REST server and Bmcweb does not allow
	// deletion of certificates
	if (certificatePtr != nullptr)
	{
	certificatePtr.reset(nullptr);
	}
	}

	std::string Manager::generateCSR(
	std::vector<std::string> alternativeNames, std::string challengePassword,
	std::string city, std::string commonName, std::string contactPerson,
	std::string country, std::string email, std::string givenName,
	std::string initials, int64_t keyBitLength, std::string keyCurveId,
	std::string keyPairAlgorithm, std::vector<std::string> keyUsage,
	std::string organization, std::string organizationalUnit, std::string state,
	std::string surname, std::string unstructuredName)
	{
	// We support only one CSR.
	csrPtr.reset(nullptr);
	auto pid = fork();
	if (pid == -1)
	{
	log<level::ERR>("Error occurred during forking process");
	report<InternalFailure>();
	}
	else if (pid == 0)
	{
	try
	{
	generateCSRHelper(alternativeNames, challengePassword, city,
	commonName, contactPerson, country, email,
	givenName, initials, keyBitLength, keyCurveId,
	keyPairAlgorithm, keyUsage, organization,
	organizationalUnit, state, surname,
	unstructuredName);
	exit(EXIT_SUCCESS);
	}
	catch (const InternalFailure& e)
	{
	// commit the error reported in child process and exit
	// Callback method from SDEvent Loop looks for exit status
	exit(EXIT_FAILURE);
	commit<InternalFailure>();
	}
	}
	else
	{
	using namespace sdeventplus::source;
	Child::Callback callback = [this](Child& eventSource,
	const siginfo_t* si) {
	eventSource.set_enabled(Enabled::On);
	if (si->si_status != 0)
	{
	this->createCSRObject(Status::FAILURE);
	}
	else
	{
	this->createCSRObject(Status::SUCCESS);
	}
	};
	try
	{
	sigset_t ss;
	if (sigemptyset(&ss) < 0)
	{
	log<level::ERR>("Unable to initialize signal set");
	elog<InternalFailure>();
	}
	if (sigaddset(&ss, SIGCHLD) < 0)
	{
	log<level::ERR>("Unable to add signal to signal set");
	elog<InternalFailure>();
	}

	// Block SIGCHLD first, so that the event loop can handle it
	if (sigprocmask(SIG_BLOCK, &ss, NULL) < 0)
	{
	log<level::ERR>("Unable to block signal");
	elog<InternalFailure>();
	}
	if (childPtr)
	{
	childPtr.reset();
	}
	childPtr = std::make_unique<Child>(event, pid, WEXITED \| WSTOPPED,
	std::move(callback));
	}
	catch (const InternalFailure& e)
	{
	commit<InternalFailure>();
	}
	}
	auto csrObjectPath = objectPath + '/' + "csr";
	return csrObjectPath;
	}

	CertificatePtr& Manager::getCertificate()
	{
	return certificatePtr;
	}

	void Manager::generateCSRHelper(
	std::vector<std::string> alternativeNames, std::string challengePassword,
	std::string city, std::string commonName, std::string contactPerson,
	std::string country, std::string email, std::string givenName,
	std::string initials, int64_t keyBitLength, std::string keyCurveId,
	std::string keyPairAlgorithm, std::vector<std::string> keyUsage,
	std::string organization, std::string organizationalUnit, std::string state,
	std::string surname, std::string unstructuredName)
	{
	int ret = 0;

	// set version of x509 req
	int nVersion = 1;
	// TODO: Issue#6 need to make version number configurable
	X509_REQ_Ptr x509Req(X509_REQ_new(), ::X509_REQ_free);
	ret = X509_REQ_set_version(x509Req.get(), nVersion);
	if (ret == 0)
	{
	log<level::ERR>("Error occured during X509_REQ_set_version call");
	elog<InternalFailure>();
	}

	// set subject of x509 req
	X509_NAME* x509Name = X509_REQ_get_subject_name(x509Req.get());

	if (!alternativeNames.empty())
	{
	for (auto& name : alternativeNames)
	{
	addEntry(x509Name, "subjectAltName", name);
	}
	}
	addEntry(x509Name, "challengePassword", challengePassword);
	addEntry(x509Name, "L", city);
	addEntry(x509Name, "CN", commonName);
	addEntry(x509Name, "name", contactPerson);
	addEntry(x509Name, "C", country);
	addEntry(x509Name, "emailAddress", email);
	addEntry(x509Name, "GN", givenName);
	addEntry(x509Name, "initials", initials);
	addEntry(x509Name, "algorithm", keyPairAlgorithm);
	if (!keyUsage.empty())
	{
	for (auto& usage : keyUsage)
	{
	if (isExtendedKeyUsage(usage))
	{
	addEntry(x509Name, "extendedKeyUsage", usage);
	}
	else
	{
	addEntry(x509Name, "keyUsage", usage);
	}
	}
	}
	addEntry(x509Name, "O", organization);
	addEntry(x509Name, "ST", state);
	addEntry(x509Name, "SN", surname);
	addEntry(x509Name, "unstructuredName", unstructuredName);

	EVP_PKEY_Ptr pKey(nullptr, ::EVP_PKEY_free);

	log<level::INFO>("Given Key pair algorithm",
	entry("KEYPAIRALGORITHM=%s", keyPairAlgorithm.c_str()));

	// Used EC algorithm as default if user did not give algorithm type.
	if (keyPairAlgorithm == "RSA")
	pKey = getRSAKeyPair(keyBitLength);
	else if ((keyPairAlgorithm == "EC") \|\| (keyPairAlgorithm.empty()))
	pKey = generateECKeyPair(keyCurveId);
	else
	{
	log<level::ERR>("Given Key pair algorithm is not supported. Supporting "
	"RSA and EC only");
	elog<InvalidArgument>(
	Argument::ARGUMENT_NAME("KEYPAIRALGORITHM"),
	Argument::ARGUMENT_VALUE(keyPairAlgorithm.c_str()));
	}

	ret = X509_REQ_set_pubkey(x509Req.get(), pKey.get());
	if (ret == 0)
	{
	log<level::ERR>("Error occured while setting Public key");
	elog<InternalFailure>();
	}

	// Write private key to file
	writePrivateKey(pKey, PRIV_KEY_FILE_NAME);

	// set sign key of x509 req
	ret = X509_REQ_sign(x509Req.get(), pKey.get(), EVP_sha256());
	if (ret == 0)
	{
	log<level::ERR>("Error occured while signing key of x509");
	elog<InternalFailure>();
	}

	log<level::INFO>("Writing CSR to file");
	fs::path csrFilePath = certParentInstallPath / CSR_FILE_NAME;
	writeCSR(csrFilePath.string(), x509Req);
	}

	bool Manager::isExtendedKeyUsage(const std::string& usage)
	{
	const static std::array<const char*, 6> usageList = {
	"ServerAuthentication", "ClientAuthentication", "OCSPSigning",
	"Timestamping", "CodeSigning", "EmailProtection"};
	auto it = std::find_if(
	usageList.begin(), usageList.end(),
	[&usage](const char* s) { return (strcmp(s, usage.c_str()) == 0); });
	return it != usageList.end();
	}
	EVP_PKEY_Ptr Manager::generateRSAKeyPair(const int64_t keyBitLength)
	{
	int ret = 0;
	// generate rsa key
	BIGNUM_Ptr bne(BN_new(), ::BN_free);
	ret = BN_set_word(bne.get(), RSA_F4);
	if (ret == 0)
	{
	log<level::ERR>("Error occured during BN_set_word call");
	elog<InternalFailure>();
	}

	int64_t keyBitLen = keyBitLength;
	// set keybit length to default value if not set
	if (keyBitLen <= 0)
	{
	constexpr auto DEFAULT_KEYBITLENGTH = 2048;
	log<level::INFO>(
	"KeyBitLength is not given.Hence, using default KeyBitLength",
	entry("DEFAULTKEYBITLENGTH=%d", DEFAULT_KEYBITLENGTH));
	keyBitLen = DEFAULT_KEYBITLENGTH;
	}
	RSA* rsa = RSA_new();
	ret = RSA_generate_key_ex(rsa, keyBitLen, bne.get(), NULL);
	if (ret != 1)
	{
	free(rsa);
	log<level::ERR>("Error occured during RSA_generate_key_ex call",
	entry("KEYBITLENGTH=%PRIu64", keyBitLen));
	elog<InternalFailure>();
	}

	// set public key of x509 req
	EVP_PKEY_Ptr pKey(EVP_PKEY_new(), ::EVP_PKEY_free);
	ret = EVP_PKEY_assign_RSA(pKey.get(), rsa);
	if (ret == 0)
	{
	free(rsa);
	log<level::ERR>("Error occured during assign rsa key into EVP");
	elog<InternalFailure>();
	}

	return pKey;
	}

	EVP_PKEY_Ptr Manager::generateECKeyPair(const std::string& curveId)
	{
	std::string curId(curveId);

	if (curId.empty())
	{
	// secp224r1 is equal to RSA 2048 KeyBitLength. Refer RFC 5349
	constexpr auto DEFAULT_KEYCURVEID = "secp224r1";
	log<level::INFO>(
	"KeyCurveId is not given. Hence using default curve id",
	entry("DEFAULTKEYCURVEID=%s", DEFAULT_KEYCURVEID));
	curId = DEFAULT_KEYCURVEID;
	}

	int ecGrp = OBJ_txt2nid(curId.c_str());

	if (ecGrp == NID_undef)
	{
	log<level::ERR>(
	"Error occured during convert the curve id string format into NID",
	entry("KEYCURVEID=%s", curId.c_str()));
	elog<InternalFailure>();
	}

	EC_KEY* ecKey = EC_KEY_new_by_curve_name(ecGrp);

	if (ecKey == NULL)
	{
	log<level::ERR>(
	"Error occured during create the EC_Key object from NID",
	entry("ECGROUP=%d", ecGrp));
	elog<InternalFailure>();
	}

	// If you want to save a key and later load it with
	// SSL_CTX_use_PrivateKey_file, then you must set the OPENSSL_EC_NAMED_CURVE
	// flag on the key.
	EC_KEY_set_asn1_flag(ecKey, OPENSSL_EC_NAMED_CURVE);

	int ret = EC_KEY_generate_key(ecKey);

	if (ret == 0)
	{
	EC_KEY_free(ecKey);
	log<level::ERR>("Error occured during generate EC key");
	elog<InternalFailure>();
	}

	EVP_PKEY_Ptr pKey(EVP_PKEY_new(), ::EVP_PKEY_free);
	ret = EVP_PKEY_assign_EC_KEY(pKey.get(), ecKey);
	if (ret == 0)
	{
	EC_KEY_free(ecKey);
	log<level::ERR>("Error occured during assign EC Key into EVP");
	elog<InternalFailure>();
	}

	return pKey;
	}

	void Manager::writePrivateKey(const EVP_PKEY_Ptr& pKey,
	const std::string& privKeyFileName)
	{
	log<level::INFO>("Writing private key to file");
	// write private key to file
	fs::path privKeyPath = certParentInstallPath / privKeyFileName;

	FILE* fp = std::fopen(privKeyPath.c_str(), "w");
	if (fp == NULL)
	{
	log<level::ERR>("Error occured creating private key file");
	elog<InternalFailure>();
	}
	int ret = PEM_write_PrivateKey(fp, pKey.get(), NULL, NULL, 0, 0, NULL);
	std::fclose(fp);
	if (ret == 0)
	{
	log<level::ERR>("Error occured while writing private key to file");
	elog<InternalFailure>();
	}
	}

	void Manager::addEntry(X509_NAME* x509Name, const char* field,
	const std::string& bytes)
	{
	if (bytes.empty())
	{
	return;
	}
	int ret = X509_NAME_add_entry_by_txt(
	x509Name, field, MBSTRING_ASC,
	reinterpret_cast<const unsigned char*>(bytes.c_str()), -1, -1, 0);
	if (ret != 1)
	{
	log<level::ERR>("Unable to set entry", entry("FIELD=%s", field),
	entry("VALUE=%s", bytes.c_str()));
	elog<InternalFailure>();
	}
	}

	void Manager::createCSRObject(const Status& status)
	{
	if (csrPtr)
	{
	csrPtr.reset(nullptr);
	}
	auto csrObjectPath = objectPath + '/' + "csr";
	csrPtr = std::make_unique<CSR>(bus, csrObjectPath.c_str(),
	certInstallPath.c_str(), status);
	}

	void Manager::writeCSR(const std::string& filePath, const X509_REQ_Ptr& x509Req)
	{
	if (fs::exists(filePath))
	{
	log<level::INFO>("Removing the existing file",
	entry("FILENAME=%s", filePath.c_str()));
	if (!fs::remove(filePath.c_str()))
	{
	log<level::ERR>("Unable to remove the file",
	entry("FILENAME=%s", filePath.c_str()));
	elog<InternalFailure>();
	}
	}

	FILE* fp = NULL;

	if ((fp = std::fopen(filePath.c_str(), "w")) == NULL)
	{
	log<level::ERR>("Error opening the file to write the CSR",
	entry("FILENAME=%s", filePath.c_str()));
	elog<InternalFailure>();
	}

	int rc = PEM_write_X509_REQ(fp, x509Req.get());
	if (!rc)
	{
	log<level::ERR>("PEM write routine failed",
	entry("FILENAME=%s", filePath.c_str()));
	std::fclose(fp);
	elog<InternalFailure>();
	}
	std::fclose(fp);
	}

	void Manager::createCertificate()
	{
	try
	{
	// TODO: Issue#3 At present supporting only one certificate to be
	// uploaded this need to be revisited to support multiple
	// certificates
	auto certObjectPath = objectPath + '/' + '1';
	certificatePtr = std::make_unique<Certificate>(
	bus, certObjectPath, certType, unitToRestart, certInstallPath,
	certInstallPath, true, certWatchPtr);
	}
	catch (const InternalFailure& e)
	{
	report<InternalFailure>();
	}
	catch (const InvalidCertificate& e)
	{
	report<InvalidCertificate>(
	Reason("Existing certificate file is corrupted"));
	}
	}

	void Manager::createRSAPrivateKeyFile()
	{
	fs::path rsaPrivateKeyFileName =
	certParentInstallPath / RSA_PRIV_KEY_FILE_NAME;

	try
	{
	if (!fs::exists(rsaPrivateKeyFileName))
	{
	writePrivateKey(generateRSAKeyPair(SUPPORTED_KEYBITLENGTH),
	RSA_PRIV_KEY_FILE_NAME);
	}
	}
	catch (const InternalFailure& e)
	{
	report<InternalFailure>();
	}
	}

	EVP_PKEY_Ptr Manager::getRSAKeyPair(const int64_t keyBitLength)
	{
	if (keyBitLength != SUPPORTED_KEYBITLENGTH)
	{
	log<level::ERR>(
	"Given Key bit length is not supported",
	entry("GIVENKEYBITLENGTH=%d", keyBitLength),
	entry("SUPPORTEDKEYBITLENGTH=%d", SUPPORTED_KEYBITLENGTH));
	elog<InvalidArgument>(
	Argument::ARGUMENT_NAME("KEYBITLENGTH"),
	Argument::ARGUMENT_VALUE(std::to_string(keyBitLength).c_str()));
	}
	fs::path rsaPrivateKeyFileName =
	certParentInstallPath / RSA_PRIV_KEY_FILE_NAME;

	FILE* privateKeyFile = std::fopen(rsaPrivateKeyFileName.c_str(), "r");
	if (!privateKeyFile)
	{
	log<level::ERR>("Unable to open RSA private key file to read",
	entry("RSAKEYFILE=%s", rsaPrivateKeyFileName.c_str()),
	entry("ERRORREASON=%s", strerror(errno)));
	elog<InternalFailure>();
	}

	EVP_PKEY_Ptr privateKey(
	PEM_read_PrivateKey(privateKeyFile, nullptr, nullptr, nullptr),
	::EVP_PKEY_free);
	std::fclose(privateKeyFile);

	if (!privateKey)
	{
	log<level::ERR>("Error occured during PEM_read_PrivateKey call");
	elog<InternalFailure>();
	}
	return privateKey;
	}
	} // namespace certs
	} // namespace phosphor