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// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012- OpenVPN Inc.
//
// SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
//
#pragma once
#include <openvpn/common/options.hpp>
namespace openvpn {
/**
* Parses the --verify-x509-name configuration option
* and provides the logic to validate an X.509 certificate subject
* against such an option.
*/
class VerifyX509Name
{
public:
enum Mode
{
VERIFY_X509_NONE = 0,
VERIFY_X509_SUBJECT_DN = 1,
VERIFY_X509_SUBJECT_RDN = 2,
VERIFY_X509_SUBJECT_RDN_PREFIX = 3
};
VerifyX509Name() = default;
VerifyX509Name(const OptionList &opt, const std::string &relay_prefix = "")
{
init(opt, relay_prefix);
}
~VerifyX509Name() = default;
void init(const OptionList &opt, const std::string &relay_prefix)
{
const Option *o = opt.get_ptr(relay_prefix + "verify-x509-name");
if (o)
{
o->min_args(1);
verify_value = o->get(1, 256);
// If the mode flag is not present, we default to subject.
// For details, see openvpn(8) man page.
mode = parse_x509_verify_mode(o->get_default(2, 256, "subject"));
}
}
std::string get_mode_str() const
{
switch (mode)
{
case VERIFY_X509_NONE:
return "VERIFY_X509_NONE";
case VERIFY_X509_SUBJECT_DN:
return "VERIFY_X509_SUBJECT_DN";
case VERIFY_X509_SUBJECT_RDN:
return "VERIFY_X509_SUBJECT_RDN";
case VERIFY_X509_SUBJECT_RDN_PREFIX:
return "VERIFY_X509_SUBJECT_RDN_PREFIX";
default:
return "VERIFY_X509_NONE";
}
}
Mode get_mode() const
{
return mode;
}
bool verify(const std::string &value) const
{
switch (mode)
{
case VERIFY_X509_NONE:
// If no verification is configured, it is always a pass
return true;
case VERIFY_X509_SUBJECT_DN:
// The input value is expected to be a full subject DN
// where a perfect match is expected
return verify_value == value;
case VERIFY_X509_SUBJECT_RDN:
// The input value is expected to be the certificate
// Common Name (CN), and a perfect patch is expected
return verify_value == value;
case VERIFY_X509_SUBJECT_RDN_PREFIX:
// The input value contains a prefix of the certificate
// Common Name (CN), where we only require a perfect match
// only on the matching prefix
return value.compare(0, verify_value.length(), verify_value) == 0;
}
return false;
}
private:
Mode mode = VERIFY_X509_NONE;
std::string verify_value;
static Mode parse_x509_verify_mode(const std::string &type)
{
if (type == "subject")
{
return VERIFY_X509_SUBJECT_DN;
}
else if (type == "name")
{
return VERIFY_X509_SUBJECT_RDN;
}
else if (type == "name-prefix")
{
return VERIFY_X509_SUBJECT_RDN_PREFIX;
}
throw option_error(ERR_INVALID_OPTION_CRYPTO, "Invalid verify-x509-name type: " + type);
}
}; // class VerifyX509Name
} // namespace openvpn
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