1/* Obtained from: https://github.com/iSECPartners/ssl-conservatory */
2
3/*
4Copyright (C) 2012, iSEC Partners.
5
6Permission is hereby granted, free of charge, to any person obtaining a copy of
7this software and associated documentation files (the "Software"), to deal in
8the Software without restriction, including without limitation the rights to
9use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
10of the Software, and to permit persons to whom the Software is furnished to do
11so, subject to the following conditions:
12
13The above copyright notice and this permission notice shall be included in all
14copies or substantial portions of the Software.
15
16THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22SOFTWARE.
23 */
24
25/*
26 * Helper functions to perform basic hostname validation using OpenSSL.
27 *
28 * Please read "everything-you-wanted-to-know-about-openssl.pdf" before
29 * attempting to use this code. This whitepaper describes how the code works,
30 * how it should be used, and what its limitations are.
31 *
32 * Author:  Alban Diquet
33 * License: See LICENSE
34 *
35 */
36
37typedef enum {
38        MatchFound,
39        MatchNotFound,
40        NoSANPresent,
41        MalformedCertificate,
42        Error
43} HostnameValidationResult;
44
45/**
46* Validates the server's identity by looking for the expected hostname in the
47* server's certificate. As described in RFC 6125, it first tries to find a match
48* in the Subject Alternative Name extension. If the extension is not present in
49* the certificate, it checks the Common Name instead.
50*
51* Returns MatchFound if a match was found.
52* Returns MatchNotFound if no matches were found.
53* Returns MalformedCertificate if any of the hostnames had a NUL character embedded in it.
54* Returns Error if there was an error.
55*/
56HostnameValidationResult validate_hostname(const char *hostname, const X509 *server_cert);
57