1use cfg_if::cfg_if;
2use std::io::{Read, Write};
3use std::ops::{Deref, DerefMut};
4
5use crate::dh::Dh;
6use crate::error::ErrorStack;
7#[cfg(any(ossl111, libressl340))]
8use crate::ssl::SslVersion;
9use crate::ssl::{
10 HandshakeError, Ssl, SslContext, SslContextBuilder, SslContextRef, SslMethod, SslMode,
11 SslOptions, SslRef, SslStream, SslVerifyMode,
12};
13use crate::version;
14use std::net::IpAddr;
15
16const FFDHE_2048: &str = "
17-----BEGIN DH PARAMETERS-----
18MIIBCAKCAQEA//////////+t+FRYortKmq/cViAnPTzx2LnFg84tNpWp4TZBFGQz
19+8yTnc4kmz75fS/jY2MMddj2gbICrsRhetPfHtXV/WVhJDP1H18GbtCFY2VVPe0a
2087VXE15/V8k1mE8McODmi3fipona8+/och3xWKE2rec1MKzKT0g6eXq8CrGCsyT7
21YdEIqUuyyOP7uWrat2DX9GgdT0Kj3jlN9K5W7edjcrsZCwenyO4KbXCeAvzhzffi
227MA0BM0oNC9hkXL+nOmFg/+OTxIy7vKBg8P+OxtMb61zO7X8vC7CIAXFjvGDfRaD
23ssbzSibBsu/6iGtCOGEoXJf//////////wIBAg==
24-----END DH PARAMETERS-----
25";
26
27#[allow(clippy::inconsistent_digit_grouping, clippy::unusual_byte_groupings)]
28fn ctx(method: SslMethod) -> Result<SslContextBuilder, ErrorStack> {
29 let mut ctx = SslContextBuilder::new(method)?;
30
31 cfg_if! {
32 if #[cfg(not(any(boringssl, awslc)))] {
33 let mut opts = SslOptions::ALL
34 | SslOptions::NO_COMPRESSION
35 | SslOptions::NO_SSLV2
36 | SslOptions::NO_SSLV3
37 | SslOptions::SINGLE_DH_USE
38 | SslOptions::SINGLE_ECDH_USE;
39 opts &= !SslOptions::DONT_INSERT_EMPTY_FRAGMENTS;
40
41 ctx.set_options(opts);
42 }
43 }
44
45 let mut mode =
46 SslMode::AUTO_RETRY | SslMode::ACCEPT_MOVING_WRITE_BUFFER | SslMode::ENABLE_PARTIAL_WRITE;
47
48 // This is quite a useful optimization for saving memory, but historically
49 // caused CVEs in OpenSSL pre-1.0.1h, according to
50 // https://bugs.python.org/issue25672
51 if version::number() >= 0x1_00_01_08_0 {
52 mode |= SslMode::RELEASE_BUFFERS;
53 }
54
55 ctx.set_mode(mode);
56
57 Ok(ctx)
58}
59
60/// A type which wraps client-side streams in a TLS session.
61///
62/// OpenSSL's default configuration is highly insecure. This connector manages the OpenSSL
63/// structures, configuring cipher suites, session options, hostname verification, and more.
64///
65/// OpenSSL's built-in hostname verification is used when linking against OpenSSL 1.0.2 or 1.1.0,
66/// and a custom implementation is used when linking against OpenSSL 1.0.1.
67#[derive(Clone, Debug)]
68pub struct SslConnector(SslContext);
69
70impl SslConnector {
71 /// Creates a new builder for TLS connections.
72 ///
73 /// The default configuration is subject to change, and is currently derived from Python.
74 pub fn builder(method: SslMethod) -> Result<SslConnectorBuilder, ErrorStack> {
75 let mut ctx = ctx(method)?;
76 ctx.set_default_verify_paths()?;
77 ctx.set_cipher_list(
78 "DEFAULT:!aNULL:!eNULL:!MD5:!3DES:!DES:!RC4:!IDEA:!SEED:!aDSS:!SRP:!PSK",
79 )?;
80 setup_verify(&mut ctx);
81
82 Ok(SslConnectorBuilder(ctx))
83 }
84
85 /// Initiates a client-side TLS session on a stream.
86 ///
87 /// The domain is used for SNI and hostname verification.
88 pub fn connect<S>(&self, domain: &str, stream: S) -> Result<SslStream<S>, HandshakeError<S>>
89 where
90 S: Read + Write,
91 {
92 self.configure()?.connect(domain, stream)
93 }
94
95 /// Returns a structure allowing for configuration of a single TLS session before connection.
96 pub fn configure(&self) -> Result<ConnectConfiguration, ErrorStack> {
97 Ssl::new(&self.0).map(|ssl| ConnectConfiguration {
98 ssl,
99 sni: true,
100 verify_hostname: true,
101 })
102 }
103
104 /// Consumes the `SslConnector`, returning the inner raw `SslContext`.
105 pub fn into_context(self) -> SslContext {
106 self.0
107 }
108
109 /// Returns a shared reference to the inner raw `SslContext`.
110 pub fn context(&self) -> &SslContextRef {
111 &self.0
112 }
113}
114
115/// A builder for `SslConnector`s.
116pub struct SslConnectorBuilder(SslContextBuilder);
117
118impl SslConnectorBuilder {
119 /// Consumes the builder, returning an `SslConnector`.
120 pub fn build(self) -> SslConnector {
121 SslConnector(self.0.build())
122 }
123}
124
125impl Deref for SslConnectorBuilder {
126 type Target = SslContextBuilder;
127
128 fn deref(&self) -> &SslContextBuilder {
129 &self.0
130 }
131}
132
133impl DerefMut for SslConnectorBuilder {
134 fn deref_mut(&mut self) -> &mut SslContextBuilder {
135 &mut self.0
136 }
137}
138
139/// A type which allows for configuration of a client-side TLS session before connection.
140pub struct ConnectConfiguration {
141 ssl: Ssl,
142 sni: bool,
143 verify_hostname: bool,
144}
145
146impl ConnectConfiguration {
147 /// A builder-style version of `set_use_server_name_indication`.
148 pub fn use_server_name_indication(mut self, use_sni: bool) -> ConnectConfiguration {
149 self.set_use_server_name_indication(use_sni);
150 self
151 }
152
153 /// Configures the use of Server Name Indication (SNI) when connecting.
154 ///
155 /// Defaults to `true`.
156 pub fn set_use_server_name_indication(&mut self, use_sni: bool) {
157 self.sni = use_sni;
158 }
159
160 /// A builder-style version of `set_verify_hostname`.
161 pub fn verify_hostname(mut self, verify_hostname: bool) -> ConnectConfiguration {
162 self.set_verify_hostname(verify_hostname);
163 self
164 }
165
166 /// Configures the use of hostname verification when connecting.
167 ///
168 /// Defaults to `true`.
169 ///
170 /// # Warning
171 ///
172 /// You should think very carefully before you use this method. If hostname verification is not
173 /// used, *any* valid certificate for *any* site will be trusted for use from any other. This
174 /// introduces a significant vulnerability to man-in-the-middle attacks.
175 pub fn set_verify_hostname(&mut self, verify_hostname: bool) {
176 self.verify_hostname = verify_hostname;
177 }
178
179 /// Returns an `Ssl` configured to connect to the provided domain.
180 ///
181 /// The domain is used for SNI (if it is not an IP address) and hostname verification if enabled.
182 pub fn into_ssl(mut self, domain: &str) -> Result<Ssl, ErrorStack> {
183 if self.sni && domain.parse::<IpAddr>().is_err() {
184 self.ssl.set_hostname(domain)?;
185 }
186
187 if self.verify_hostname {
188 setup_verify_hostname(&mut self.ssl, domain)?;
189 }
190
191 Ok(self.ssl)
192 }
193
194 /// Initiates a client-side TLS session on a stream.
195 ///
196 /// The domain is used for SNI and hostname verification if enabled.
197 pub fn connect<S>(self, domain: &str, stream: S) -> Result<SslStream<S>, HandshakeError<S>>
198 where
199 S: Read + Write,
200 {
201 self.into_ssl(domain)?.connect(stream)
202 }
203}
204
205impl Deref for ConnectConfiguration {
206 type Target = SslRef;
207
208 fn deref(&self) -> &SslRef {
209 &self.ssl
210 }
211}
212
213impl DerefMut for ConnectConfiguration {
214 fn deref_mut(&mut self) -> &mut SslRef {
215 &mut self.ssl
216 }
217}
218
219/// A type which wraps server-side streams in a TLS session.
220///
221/// OpenSSL's default configuration is highly insecure. This connector manages the OpenSSL
222/// structures, configuring cipher suites, session options, and more.
223#[derive(Clone)]
224pub struct SslAcceptor(SslContext);
225
226impl SslAcceptor {
227 /// Creates a new builder configured to connect to non-legacy clients. This should generally be
228 /// considered a reasonable default choice.
229 ///
230 /// This corresponds to the intermediate configuration of version 5 of Mozilla's server side TLS
231 /// recommendations. See its [documentation][docs] for more details on specifics.
232 ///
233 /// [docs]: https://wiki.mozilla.org/Security/Server_Side_TLS
234 pub fn mozilla_intermediate_v5(method: SslMethod) -> Result<SslAcceptorBuilder, ErrorStack> {
235 let mut ctx = ctx(method)?;
236 ctx.set_options(SslOptions::NO_TLSV1 | SslOptions::NO_TLSV1_1);
237 let dh = Dh::params_from_pem(FFDHE_2048.as_bytes())?;
238 ctx.set_tmp_dh(&dh)?;
239 setup_curves(&mut ctx)?;
240 ctx.set_cipher_list(
241 "ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:\
242 ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:\
243 DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384"
244 )?;
245 #[cfg(any(ossl111, libressl340))]
246 ctx.set_ciphersuites(
247 "TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256",
248 )?;
249 Ok(SslAcceptorBuilder(ctx))
250 }
251
252 /// Creates a new builder configured to connect to modern clients.
253 ///
254 /// This corresponds to the modern configuration of version 5 of Mozilla's server side TLS recommendations.
255 /// See its [documentation][docs] for more details on specifics.
256 ///
257 /// Requires OpenSSL 1.1.1 or LibreSSL 3.4.0 or newer.
258 ///
259 /// [docs]: https://wiki.mozilla.org/Security/Server_Side_TLS
260 #[cfg(any(ossl111, libressl340))]
261 pub fn mozilla_modern_v5(method: SslMethod) -> Result<SslAcceptorBuilder, ErrorStack> {
262 let mut ctx = ctx(method)?;
263 ctx.set_min_proto_version(Some(SslVersion::TLS1_3))?;
264 ctx.set_ciphersuites(
265 "TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256",
266 )?;
267 Ok(SslAcceptorBuilder(ctx))
268 }
269
270 /// Creates a new builder configured to connect to non-legacy clients. This should generally be
271 /// considered a reasonable default choice.
272 ///
273 /// This corresponds to the intermediate configuration of version 4 of Mozilla's server side TLS
274 /// recommendations. See its [documentation][docs] for more details on specifics.
275 ///
276 /// [docs]: https://wiki.mozilla.org/Security/Server_Side_TLS
277 // FIXME remove in next major version
278 pub fn mozilla_intermediate(method: SslMethod) -> Result<SslAcceptorBuilder, ErrorStack> {
279 let mut ctx = ctx(method)?;
280 ctx.set_options(SslOptions::CIPHER_SERVER_PREFERENCE);
281 #[cfg(any(ossl111, libressl340))]
282 ctx.set_options(SslOptions::NO_TLSV1_3);
283 let dh = Dh::params_from_pem(FFDHE_2048.as_bytes())?;
284 ctx.set_tmp_dh(&dh)?;
285 setup_curves(&mut ctx)?;
286 ctx.set_cipher_list(
287 "ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:\
288 ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:\
289 DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:\
290 ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:\
291 ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:\
292 DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:\
293 EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:\
294 AES256-SHA:DES-CBC3-SHA:!DSS",
295 )?;
296 Ok(SslAcceptorBuilder(ctx))
297 }
298
299 /// Creates a new builder configured to connect to modern clients.
300 ///
301 /// This corresponds to the modern configuration of version 4 of Mozilla's server side TLS recommendations.
302 /// See its [documentation][docs] for more details on specifics.
303 ///
304 /// [docs]: https://wiki.mozilla.org/Security/Server_Side_TLS
305 // FIXME remove in next major version
306 pub fn mozilla_modern(method: SslMethod) -> Result<SslAcceptorBuilder, ErrorStack> {
307 let mut ctx = ctx(method)?;
308 ctx.set_options(
309 SslOptions::CIPHER_SERVER_PREFERENCE | SslOptions::NO_TLSV1 | SslOptions::NO_TLSV1_1,
310 );
311 #[cfg(any(ossl111, libressl340))]
312 ctx.set_options(SslOptions::NO_TLSV1_3);
313 setup_curves(&mut ctx)?;
314 ctx.set_cipher_list(
315 "ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:\
316 ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:\
317 ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256",
318 )?;
319 Ok(SslAcceptorBuilder(ctx))
320 }
321
322 /// Initiates a server-side TLS session on a stream.
323 pub fn accept<S>(&self, stream: S) -> Result<SslStream<S>, HandshakeError<S>>
324 where
325 S: Read + Write,
326 {
327 let ssl = Ssl::new(&self.0)?;
328 ssl.accept(stream)
329 }
330
331 /// Consumes the `SslAcceptor`, returning the inner raw `SslContext`.
332 pub fn into_context(self) -> SslContext {
333 self.0
334 }
335
336 /// Returns a shared reference to the inner raw `SslContext`.
337 pub fn context(&self) -> &SslContextRef {
338 &self.0
339 }
340}
341
342/// A builder for `SslAcceptor`s.
343pub struct SslAcceptorBuilder(SslContextBuilder);
344
345impl SslAcceptorBuilder {
346 /// Consumes the builder, returning a `SslAcceptor`.
347 pub fn build(self) -> SslAcceptor {
348 SslAcceptor(self.0.build())
349 }
350}
351
352impl Deref for SslAcceptorBuilder {
353 type Target = SslContextBuilder;
354
355 fn deref(&self) -> &SslContextBuilder {
356 &self.0
357 }
358}
359
360impl DerefMut for SslAcceptorBuilder {
361 fn deref_mut(&mut self) -> &mut SslContextBuilder {
362 &mut self.0
363 }
364}
365
366cfg_if! {
367 if #[cfg(ossl110)] {
368 #[allow(clippy::unnecessary_wraps)]
369 fn setup_curves(_: &mut SslContextBuilder) -> Result<(), ErrorStack> {
370 Ok(())
371 }
372 } else if #[cfg(any(ossl102, libressl))] {
373 fn setup_curves(ctx: &mut SslContextBuilder) -> Result<(), ErrorStack> {
374 ctx.set_ecdh_auto(true)
375 }
376 } else {
377 fn setup_curves(ctx: &mut SslContextBuilder) -> Result<(), ErrorStack> {
378 use crate::ec::EcKey;
379 use crate::nid::Nid;
380
381 let curve = EcKey::from_curve_name(Nid::X9_62_PRIME256V1)?;
382 ctx.set_tmp_ecdh(&curve)
383 }
384 }
385}
386
387cfg_if! {
388 if #[cfg(any(ossl102, libressl261))] {
389 fn setup_verify(ctx: &mut SslContextBuilder) {
390 ctx.set_verify(SslVerifyMode::PEER);
391 }
392
393 fn setup_verify_hostname(ssl: &mut SslRef, domain: &str) -> Result<(), ErrorStack> {
394 use crate::x509::verify::X509CheckFlags;
395
396 let param = ssl.param_mut();
397 param.set_hostflags(X509CheckFlags::NO_PARTIAL_WILDCARDS);
398 match domain.parse() {
399 Ok(ip) => param.set_ip(ip),
400 Err(_) => param.set_host(domain),
401 }
402 }
403 } else {
404 fn setup_verify(ctx: &mut SslContextBuilder) {
405 ctx.set_verify_callback(SslVerifyMode::PEER, verify::verify_callback);
406 }
407
408 fn setup_verify_hostname(ssl: &mut Ssl, domain: &str) -> Result<(), ErrorStack> {
409 let domain = domain.to_string();
410 let hostname_idx = verify::try_get_hostname_idx()?;
411 ssl.set_ex_data(*hostname_idx, domain);
412 Ok(())
413 }
414
415 mod verify {
416 use std::net::IpAddr;
417 use std::str;
418 use once_cell::sync::OnceCell;
419
420 use crate::error::ErrorStack;
421 use crate::ex_data::Index;
422 use crate::nid::Nid;
423 use crate::ssl::Ssl;
424 use crate::stack::Stack;
425 use crate::x509::{
426 GeneralName, X509NameRef, X509Ref, X509StoreContext, X509StoreContextRef,
427 X509VerifyResult,
428 };
429
430 static HOSTNAME_IDX: OnceCell<Index<Ssl, String>> = OnceCell::new();
431
432 pub fn try_get_hostname_idx() -> Result<&'static Index<Ssl, String>, ErrorStack> {
433 HOSTNAME_IDX.get_or_try_init(Ssl::new_ex_index)
434 }
435
436 pub fn verify_callback(preverify_ok: bool, x509_ctx: &mut X509StoreContextRef) -> bool {
437 if !preverify_ok || x509_ctx.error_depth() != 0 {
438 return preverify_ok;
439 }
440
441 let hostname_idx =
442 try_get_hostname_idx().expect("failed to initialize hostname index");
443 let ok = match (
444 x509_ctx.current_cert(),
445 X509StoreContext::ssl_idx()
446 .ok()
447 .and_then(|idx| x509_ctx.ex_data(idx))
448 .and_then(|ssl| ssl.ex_data(*hostname_idx)),
449 ) {
450 (Some(x509), Some(domain)) => verify_hostname(domain, &x509),
451 _ => true,
452 };
453
454 if !ok {
455 x509_ctx.set_error(X509VerifyResult::APPLICATION_VERIFICATION);
456 }
457
458 ok
459 }
460
461 fn verify_hostname(domain: &str, cert: &X509Ref) -> bool {
462 match cert.subject_alt_names() {
463 Some(names) => verify_subject_alt_names(domain, names),
464 None => verify_subject_name(domain, &cert.subject_name()),
465 }
466 }
467
468 fn verify_subject_alt_names(domain: &str, names: Stack<GeneralName>) -> bool {
469 let ip = domain.parse();
470
471 for name in &names {
472 match ip {
473 Ok(ip) => {
474 if let Some(actual) = name.ipaddress() {
475 if matches_ip(&ip, actual) {
476 return true;
477 }
478 }
479 }
480 Err(_) => {
481 if let Some(pattern) = name.dnsname() {
482 if matches_dns(pattern, domain) {
483 return true;
484 }
485 }
486 }
487 }
488 }
489
490 false
491 }
492
493 fn verify_subject_name(domain: &str, subject_name: &X509NameRef) -> bool {
494 match subject_name.entries_by_nid(Nid::COMMONNAME).next() {
495 Some(pattern) => {
496 let pattern = match str::from_utf8(pattern.data().as_slice()) {
497 Ok(pattern) => pattern,
498 Err(_) => return false,
499 };
500
501 // Unlike SANs, IP addresses in the subject name don't have a
502 // different encoding.
503 match domain.parse::<IpAddr>() {
504 Ok(ip) => pattern
505 .parse::<IpAddr>()
506 .ok()
507 .map_or(false, |pattern| pattern == ip),
508 Err(_) => matches_dns(pattern, domain),
509 }
510 }
511 None => false,
512 }
513 }
514
515 fn matches_dns(mut pattern: &str, mut hostname: &str) -> bool {
516 // first strip trailing . off of pattern and hostname to normalize
517 if pattern.ends_with('.') {
518 pattern = &pattern[..pattern.len() - 1];
519 }
520 if hostname.ends_with('.') {
521 hostname = &hostname[..hostname.len() - 1];
522 }
523
524 matches_wildcard(pattern, hostname).unwrap_or_else(|| pattern.eq_ignore_ascii_case(hostname))
525 }
526
527 fn matches_wildcard(pattern: &str, hostname: &str) -> Option<bool> {
528 let wildcard_location = match pattern.find('*') {
529 Some(l) => l,
530 None => return None,
531 };
532
533 let mut dot_idxs = pattern.match_indices('.').map(|(l, _)| l);
534 let wildcard_end = match dot_idxs.next() {
535 Some(l) => l,
536 None => return None,
537 };
538
539 // Never match wildcards if the pattern has less than 2 '.'s (no *.com)
540 //
541 // This is a bit dubious, as it doesn't disallow other TLDs like *.co.uk.
542 // Chrome has a black- and white-list for this, but Firefox (via NSS) does
543 // the same thing we do here.
544 //
545 // The Public Suffix (https://www.publicsuffix.org/) list could
546 // potentially be used here, but it's both huge and updated frequently
547 // enough that management would be a PITA.
548 if dot_idxs.next().is_none() {
549 return None;
550 }
551
552 // Wildcards can only be in the first component, and must be the entire first label
553 if wildcard_location != 0 || wildcard_end != wildcard_location + 1 {
554 return None;
555 }
556
557 let hostname_label_end = match hostname.find('.') {
558 Some(l) => l,
559 None => return None,
560 };
561
562 let pattern_after_wildcard = &pattern[wildcard_end..];
563 let hostname_after_wildcard = &hostname[hostname_label_end..];
564
565 Some(pattern_after_wildcard.eq_ignore_ascii_case(hostname_after_wildcard))
566 }
567
568 fn matches_ip(expected: &IpAddr, actual: &[u8]) -> bool {
569 match *expected {
570 IpAddr::V4(ref addr) => actual == addr.octets(),
571 IpAddr::V6(ref addr) => actual == addr.octets(),
572 }
573 }
574
575 #[test]
576 fn test_dns_match() {
577 use crate::ssl::connector::verify::matches_dns;
578 assert!(matches_dns("website.tld", "website.tld")); // A name should match itself.
579 assert!(matches_dns("website.tld", "wEbSiTe.tLd")); // DNS name matching ignores case of hostname.
580 assert!(matches_dns("wEbSiTe.TlD", "website.tld")); // DNS name matching ignores case of subject.
581
582 assert!(matches_dns("xn--bcher-kva.tld", "xn--bcher-kva.tld")); // Likewise, nothing special to punycode names.
583 assert!(matches_dns("xn--bcher-kva.tld", "xn--BcHer-Kva.tLd")); // And punycode must be compared similarly case-insensitively.
584
585 assert!(matches_dns("*.example.com", "subdomain.example.com")); // Wildcard matching works.
586 assert!(matches_dns("*.eXaMpLe.cOm", "subdomain.example.com")); // Wildcard matching ignores case of subject.
587 assert!(matches_dns("*.example.com", "sUbDoMaIn.eXaMpLe.cOm")); // Wildcard matching ignores case of hostname.
588
589 assert!(!matches_dns("prefix*.example.com", "p.example.com")); // Prefix longer than the label works and does not match.
590 assert!(!matches_dns("*suffix.example.com", "s.example.com")); // Suffix longer than the label works and does not match.
591
592 assert!(!matches_dns("prefix*.example.com", "prefix.example.com")); // Partial wildcards do not work.
593 assert!(!matches_dns("*suffix.example.com", "suffix.example.com")); // Partial wildcards do not work.
594
595 assert!(!matches_dns("prefix*.example.com", "prefixdomain.example.com")); // Partial wildcards do not work.
596 assert!(!matches_dns("*suffix.example.com", "domainsuffix.example.com")); // Partial wildcards do not work.
597
598 assert!(!matches_dns("xn--*.example.com", "subdomain.example.com")); // Punycode domains with wildcard parts do not match.
599 assert!(!matches_dns("xN--*.example.com", "subdomain.example.com")); // And we can't bypass a punycode test with weird casing.
600 assert!(!matches_dns("Xn--*.example.com", "subdomain.example.com")); // And we can't bypass a punycode test with weird casing.
601 assert!(!matches_dns("XN--*.example.com", "subdomain.example.com")); // And we can't bypass a punycode test with weird casing.
602 }
603 }
604 }
605}
606