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https://github.com/OpenVPN/openvpn3.git
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71a14a3553
This new VerifyX509Name class handles both extracting and parsing the appropriate --verify-x509-name option and is able to verify if a given subject or hostname is matching the expectation. Signed-off-by: David Sommerseth <davids@openvpn.net>
121 lines
3.7 KiB
C++
121 lines
3.7 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2019 OpenVPN Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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//
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#pragma once
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#include <openvpn/common/options.hpp>
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namespace openvpn {
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/**
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* Parses the --verify-x509-name configuration option
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* and provides the logic to validate an X.509 certificate subject
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* against such an option.
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*/
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class VerifyX509Name {
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public:
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enum Mode {
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VERIFY_X509_NONE = 0,
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VERIFY_X509_SUBJECT_DN = 1,
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VERIFY_X509_SUBJECT_RDN = 2,
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VERIFY_X509_SUBJECT_RDN_PREFIX = 3
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};
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VerifyX509Name() = default;
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VerifyX509Name(const OptionList& opt, const std::string& relay_prefix = "") {
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init(opt, relay_prefix);
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}
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~VerifyX509Name() = default;
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void init(const OptionList& opt, const std::string& relay_prefix) {
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const Option* o = opt.get_ptr(relay_prefix + "verify-x509-name");
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if (o) {
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o->min_args(1);
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verify_value = o->get(1, 256);
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// If the mode flag is not present, we default to subject.
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// For details, see openvpn(8) man page.
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mode = parse_x509_verify_mode(o->get_default(2, 256, "subject"));
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}
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}
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std::string get_mode_str() const {
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switch (mode) {
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case VERIFY_X509_NONE:
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return "VERIFY_X509_NONE";
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case VERIFY_X509_SUBJECT_DN:
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return "VERIFY_X509_SUBJECT_DN";
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case VERIFY_X509_SUBJECT_RDN:
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return "VERIFY_X509_SUBJECT_RDN";
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case VERIFY_X509_SUBJECT_RDN_PREFIX:
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return "VERIFY_X509_SUBJECT_RDN_PREFIX";
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default:
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return "VERIFY_X509_NONE";
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}
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}
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Mode get_mode() const { return mode; }
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bool verify(const std::string& value) const {
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switch (mode) {
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case VERIFY_X509_NONE:
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// If no verification is configured, it is always a pass
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return true;
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case VERIFY_X509_SUBJECT_DN:
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// The input value is expected to be a full subject DN
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// where a perfect match is expected
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return verify_value == value;
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case VERIFY_X509_SUBJECT_RDN:
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// The input value is expected to be the certificate
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// Common Name (CN), and a perfect patch is expected
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return verify_value == value;
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case VERIFY_X509_SUBJECT_RDN_PREFIX:
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// The input value contains a prefix of the certificate
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// Common Name (CN), where we only require a perfect match
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// only on the matching prefix
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return value.compare(0, verify_value.length(), verify_value) == 0;
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}
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return false;
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}
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private:
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Mode mode = VERIFY_X509_NONE;
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std::string verify_value;
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static Mode parse_x509_verify_mode(const std::string& type) {
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if (type == "subject") {
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return VERIFY_X509_SUBJECT_DN;
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} else if (type == "name") {
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return VERIFY_X509_SUBJECT_RDN;
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} else if (type == "name-prefix") {
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return VERIFY_X509_SUBJECT_RDN_PREFIX;
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}
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throw option_error("Invalid verify-x509-name type: " + type);
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}
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}; // class VerifyX509Name
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} // namespace openvpn
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