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https://github.com/OpenVPN/openvpn3.git
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e9a903fd9f
This option lets you specify the SHA256 fingerprint of a peer's self-signed certificate. The peer's certificate, presented during connection bring-up, is compared to the fingerprint. The connection fails if it doesn't match. So, this serves as an easy, yet secure, alternative to setting up a PKI, but can also be used in conjunction with one to add one more check during leaf certificate validation. The option can also be given as inline block, for easier management for multiple fingerprints: <peer-fingerprint> 00:11:22:33:...:BB:CC:DD:FF BB:CC:DD:FF:...:00:11:22:33 </peer-fingerprint> Signed-off-by: Heiko Hund <heiko@openvpn.net>
160 lines
5.4 KiB
C++
160 lines
5.4 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) 2012-2021 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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#include <string>
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#include "test_common.h"
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#include "openvpn/ssl/peer_fingerprint.hpp"
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using namespace openvpn;
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namespace unittests {
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std::vector<uint8_t> test_fingerprint = {
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0x44, 0xF5, 0xA6, 0x4D, 0x4A, 0xCB, 0x65, 0xE1, 0x8A, 0x9F, 0x55, 0x89, 0x7F, 0x77, 0xA0, 0x79,
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0xAA, 0xFB, 0xCC, 0xA1, 0x37, 0x2F, 0xD8, 0xB3, 0x47, 0xAA, 0x9D, 0xE3, 0xD0, 0x76, 0xB1, 0x44
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};
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TEST(PeerFingerprint, parse_config) {
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OptionList cfg;
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cfg.parse_from_config(
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"peer-fingerprint 01:F5:A6:4D:4A:CB:65:E1:8A:9F:55:89:7F:77:A0:79:AA:FB:CC:A1:37:2F:D8:B3:47:AA:9D:E3:D0:76:B1:44\n"
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"<peer-fingerprint>\n"
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"02:F5:A6:4D:4A:CB:65:E1:8A:9F:55:89:7F:77:A0:79:AA:FB:CC:A1:37:2F:D8:B3:47:AA:9D:E3:D0:76:B1:44\n"
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"03:F5:A6:4D:4A:CB:65:E1:8A:9F:55:89:7F:77:A0:79:AA:FB:CC:A1:37:2F:D8:B3:47:AA:9D:E3:D0:76:B1:44 \n"
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"</peer-fingerprint>\n"
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"peer-fingerprint 04:F5:A6:4D:4A:CB:65:E1:8A:9F:55:89:7F:77:A0:79:AA:FB:CC:A1:37:2F:D8:B3:47:AA:9D:E3:D0:76:B1:44 \n"
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, nullptr);
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cfg.update_map();
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struct TestPeerFingerprints : public PeerFingerprints
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{
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TestPeerFingerprints(const OptionList& opt, std::size_t fp_size)
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: PeerFingerprints(opt, fp_size) {}
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std::size_t size() { return fingerprints_.size(); }
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};
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TestPeerFingerprints fps(cfg, test_fingerprint.size());
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ASSERT_EQ(fps.size(), 4);
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for (std::size_t i = 1; i <= fps.size(); ++i)
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{
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auto fingerprint = test_fingerprint;
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fingerprint[0] = i;
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PeerFingerprint fp(fingerprint);
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ASSERT_EQ(fps.match(fp), true);
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}
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}
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TEST(PeerFingerprint, malformed) {
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OptionList cfg;
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cfg.parse_from_config(
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"peer-fingerprint 01:F5:A6:4D:4A:CB:65:E1:8A:9F:55:89:7F:77:A0:79:AA:FB:CC:A1:37:2F:D8:B3:47:AA:9D:E3:D0:76:B1\n"
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, nullptr);
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cfg.update_map();
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EXPECT_THROW(PeerFingerprints(cfg, test_fingerprint.size()), option_error);
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cfg.clear();
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cfg.parse_from_config(
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"peer-fingerprint 01:F5:A6:4D:4A:CB:65:E1:8A:9F:55:89:7F:77:A0:79:AA:FB:CC:A1:37:2F:D8:B3:47:AA:9D:E3:D0:76:B1:55:FF\n"
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, nullptr);
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cfg.update_map();
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EXPECT_THROW(PeerFingerprints(cfg, test_fingerprint.size()), option_error);
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cfg.clear();
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cfg.parse_from_config(
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"peer-fingerprint 101:F5:A6:4D:4A:CB:65:E1:8A:9F:55:89:7F:77:A0:79:AA:FB:CC:A1:37:2F:D8:B3:47:AA:9D:E3:D0:76:B1:55\n"
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, nullptr);
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cfg.update_map();
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EXPECT_THROW(PeerFingerprints(cfg, test_fingerprint.size()), option_error);
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cfg.clear();
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cfg.parse_from_config(
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"peer-fingerprint 11:F5:A6:4D:4A:1CB:65:E1:8A:9F:55:89:7F:77:A0:79:AA:FB:CC:A1:37:2F:D8:B3:47:AA:9D:E3:D0:76:B1:55\n"
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, nullptr);
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cfg.update_map();
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EXPECT_THROW(PeerFingerprints(cfg, test_fingerprint.size()), option_error);
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cfg.clear();
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cfg.parse_from_config(
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"peer-fingerprint 11/F5/A6/4D/4A/CB/65/E1/8A/9F/55/89/7F/77/A0/79/AA/FB/CC/A1/37/2F/D8/B3/47/AA/9D/E3/D0/76/B1/55\n"
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, nullptr);
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cfg.update_map();
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EXPECT_THROW(PeerFingerprints(cfg, test_fingerprint.size()), option_error);
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cfg.clear();
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cfg.parse_from_config(
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"<peer-fingerprint>\n"
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" 02:F5:A6:4D:4A:CB:65:E1:8A:9F:55:89:7F:77:A0:79:AA:FB:CC:A1:37:2F:D8:B3:47:AA:9D:E3:D0:76:B1:44\n"
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"</peer-fingerprint>\n"
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, nullptr);
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cfg.update_map();
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EXPECT_THROW(PeerFingerprints(cfg, test_fingerprint.size()), option_error);
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}
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TEST(PeerFingerprint, stringify) {
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std::string hex_fp("01:f5:a6:4d:4a:cb:65:e1:8a:9f:55:89:7f:77:a0:79:aa:fb:cc:a1:37:2f:d8:b3:47:aa:9d:e3:d0:76:b1:55");
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PeerFingerprint fp(hex_fp, test_fingerprint.size());
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ASSERT_EQ(fp.str(), hex_fp);
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}
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TEST(PeerFingerprint, match_empty) {
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PeerFingerprint fp(test_fingerprint);
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PeerFingerprints fps;
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ASSERT_FALSE(fps);
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ASSERT_EQ(fps.match(fp), false);
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}
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TEST(PeerFingerprint, match) {
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OptionList cfg;
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cfg.parse_from_config(
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"<peer-fingerprint>\n"
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"A4:E5:A7:1D:AA:E3:65:E1:3A:6E:45:89:80:66:A0:79:BB:E3:EC:41:34:2F:08:83:97:AA:91:33:DF:11:31:AA\n"
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"44:F5:A6:4D:4A:CB:65:E1:8A:9F:55:89:7F:77:A0:79:AA:FB:CC:A1:37:2F:D8:B3:47:AA:9D:E3:D0:76:B1:44\n"
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"</peer-fingerprint>\n"
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, nullptr);
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cfg.update_map();
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PeerFingerprint fp(test_fingerprint);
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PeerFingerprints fps(cfg, test_fingerprint.size());
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ASSERT_EQ(fps.match(fp), true);
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}
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TEST(PeerFingerprint, no_match) {
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OptionList cfg;
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cfg.parse_from_config(
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"peer-fingerprint A4:E5:A7:1D:AA:E3:65:E1:3A:6E:45:89:80:66:A0:79:BB:E3:EC:41:34:2F:08:83:97:AA:91:33:DF:11:31:AA\n"
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, nullptr);
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cfg.update_map();
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PeerFingerprint fp(test_fingerprint);
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PeerFingerprints fps(cfg, test_fingerprint.size());
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ASSERT_EQ(fps.match(fp), false);
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}
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} // namespace unittests
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