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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "private_key.h"
#include <vespa/vespalib/stllike/string.h>
#include <chrono>
#include <memory>
#include <vector>
namespace vespalib::crypto {
/**
* Represents an X509 certificate instance and provides utility methods
* for generating new certificates on the fly. Certificates can be created
* for both Certificate Authorities and regular hosts (leaves).
*
* This implementation aims to ensure that best cryptographic practices are
* followed automatically. In particular:
* - The certificate digest is always SHA-256, never SHA-1 or MD5
* - The certificate serial number is a 160-bit secure random sequence
* (technically 159 bits since the MSB is always zero) rather than a
* collision-prone or predictable sequence number.
*
*/
class X509Certificate {
public:
virtual ~X509Certificate() = default;
virtual vespalib::string to_pem() const = 0;
struct DistinguishedName {
vespalib::string _country; // "C"
vespalib::string _state; // "ST"
vespalib::string _locality; // "L"
vespalib::string _organization; // "O"
vespalib::string _organizational_unit; // "OU"
// Should only be 1 entry in normal certs, but X509 supports more and
// we want to be able to test this edge case.
std::vector<vespalib::string> _common_names; // "CN"
DistinguishedName() noexcept;
DistinguishedName(const DistinguishedName&);
DistinguishedName& operator=(const DistinguishedName&) = delete;
DistinguishedName(DistinguishedName&&) noexcept;
DistinguishedName& operator=(DistinguishedName&&) noexcept;
~DistinguishedName();
// TODO could add rvalue overloads as well...
DistinguishedName& country(vespalib::stringref c) { _country = c; return *this; }
DistinguishedName& state(vespalib::stringref st) { _state = st; return *this; }
DistinguishedName& locality(vespalib::stringref l) { _locality = l; return *this; }
DistinguishedName& organization(vespalib::stringref o) { _organization = o; return *this; }
DistinguishedName& organizational_unit(vespalib::stringref ou) {
_organizational_unit = ou;
return *this;
}
DistinguishedName& add_common_name(vespalib::stringref cn) {
_common_names.emplace_back(cn);
return *this;
}
};
struct SubjectInfo {
DistinguishedName dn;
std::vector<vespalib::string> subject_alt_names;
SubjectInfo() noexcept;
explicit SubjectInfo(DistinguishedName dn_) noexcept;
SubjectInfo(const SubjectInfo &);
SubjectInfo & operator=(const SubjectInfo &) = delete;
SubjectInfo(SubjectInfo &&) noexcept;
SubjectInfo & operator=(SubjectInfo &&) noexcept;
~SubjectInfo();
SubjectInfo& add_subject_alt_name(vespalib::string san) {
subject_alt_names.emplace_back(std::move(san));
return *this;
}
};
struct Params {
Params() noexcept;
~Params();
Params(const Params&);
Params& operator=(const Params&) = delete;
Params(Params&&) noexcept;
Params& operator=(Params&&) noexcept;
SubjectInfo subject_info;
// TODO make public key, but private key has both.
std::shared_ptr<PrivateKey> subject_key;
std::shared_ptr<X509Certificate> issuer; // May be nullptr for self-signed certs
std::shared_ptr<PrivateKey> issuer_key;
std::chrono::seconds valid_for = std::chrono::hours(24);
bool is_ca = false;
static Params self_signed(SubjectInfo subject, std::shared_ptr<PrivateKey> key);
// TODO only need _public_ key from subject, but this is simplified
static Params issued_by(SubjectInfo subject,
std::shared_ptr<PrivateKey> subject_key,
std::shared_ptr<X509Certificate> issuer,
std::shared_ptr<PrivateKey> issuer_key);
};
// Generates an X509 certificate using a SHA-256 digest
static std::shared_ptr<X509Certificate> generate_from(Params params);
protected:
X509Certificate() = default;
};
/*
* Simple wrapper for storing both a X509 certificate and the private key
* that signed it. Useful for testing.
*/
struct CertKeyWrapper {
std::shared_ptr<X509Certificate> cert;
std::shared_ptr<PrivateKey> key;
CertKeyWrapper(std::shared_ptr<X509Certificate> cert_,
std::shared_ptr<PrivateKey> key_);
CertKeyWrapper(CertKeyWrapper &&) noexcept;
CertKeyWrapper & operator=(CertKeyWrapper &&) noexcept;
~CertKeyWrapper();
};
}
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