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// Copyright 2015-2020 Brian Smith.
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#[cfg(feature = "alloc")]
use alloc::string::String;
/// A DNS Name suitable for use in the TLS Server Name Indication (SNI)
/// extension and/or for use as the reference hostname for which to verify a
/// certificate.
///
/// A `DnsName` is guaranteed to be syntactically valid. The validity rules are
/// specified in [RFC 5280 Section 7.2], except that underscores are also
/// allowed.
///
/// `DnsName` stores a copy of the input it was constructed from in a `String`
/// and so it is only available when the `std` default feature is enabled.
///
/// `Eq`, `PartialEq`, etc. are not implemented because name comparison
/// frequently should be done case-insensitively and/or with other caveats that
/// depend on the specific circumstances in which the comparison is done.
///
/// [RFC 5280 Section 7.2]: https://tools.ietf.org/html/rfc5280#section-7.2
///
/// Requires the `alloc` feature.
#[cfg(feature = "alloc")]
#[derive(Clone, Debug, Eq, PartialEq, Hash)]
pub struct DnsName(String);
/// Requires the `alloc` feature.
#[cfg(feature = "alloc")]
impl DnsName {
/// Returns a `DnsNameRef` that refers to this `DnsName`.
pub fn as_ref(&self) -> DnsNameRef {
DnsNameRef(self.0.as_bytes())
}
}
/// Requires the `alloc` feature.
#[cfg(feature = "alloc")]
impl AsRef<str> for DnsName {
fn as_ref(&self) -> &str {
self.0.as_ref()
}
}
/// Requires the `alloc` feature.
// Deprecated
#[cfg(feature = "alloc")]
impl From<DnsNameRef<'_>> for DnsName {
fn from(dns_name: DnsNameRef) -> Self {
dns_name.to_owned()
}
}
/// A reference to a DNS Name suitable for use in the TLS Server Name Indication
/// (SNI) extension and/or for use as the reference hostname for which to verify
/// a certificate.
///
/// A `DnsNameRef` is guaranteed to be syntactically valid. The validity rules
/// are specified in [RFC 5280 Section 7.2], except that underscores are also
/// allowed.
///
/// `Eq`, `PartialEq`, etc. are not implemented because name comparison
/// frequently should be done case-insensitively and/or with other caveats that
/// depend on the specific circumstances in which the comparison is done.
///
/// [RFC 5280 Section 7.2]: https://tools.ietf.org/html/rfc5280#section-7.2
#[derive(Clone, Copy)]
pub struct DnsNameRef<'a>(&'a [u8]);
impl AsRef<[u8]> for DnsNameRef<'_> {
#[inline]
fn as_ref(&self) -> &[u8] {
self.0
}
}
/// An error indicating that a `DnsNameRef` could not built because the input
/// is not a syntactically-valid DNS Name.
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub struct InvalidDnsNameError;
impl core::fmt::Display for InvalidDnsNameError {
fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
write!(f, "{:?}", self)
}
}
/// Requires the `std` feature.
#[cfg(feature = "std")]
impl ::std::error::Error for InvalidDnsNameError {}
impl<'a> DnsNameRef<'a> {
/// Constructs a `DnsNameRef` from the given input if the input is a
/// syntactically-valid DNS name.
pub fn try_from_ascii(dns_name: &'a [u8]) -> Result<Self, InvalidDnsNameError> {
if !is_valid_reference_dns_id(untrusted::Input::from(dns_name)) {
return Err(InvalidDnsNameError);
}
Ok(Self(dns_name))
}
/// Constructs a `DnsNameRef` from the given input if the input is a
/// syntactically-valid DNS name.
pub fn try_from_ascii_str(dns_name: &'a str) -> Result<Self, InvalidDnsNameError> {
Self::try_from_ascii(dns_name.as_bytes())
}
/// Constructs a `DnsName` from this `DnsNameRef`
///
/// Requires the `alloc` feature.
#[cfg(feature = "alloc")]
pub fn to_owned(&self) -> DnsName {
// DnsNameRef is already guaranteed to be valid ASCII, which is a
// subset of UTF-8.
let s: &str = self.clone().into();
DnsName(s.to_ascii_lowercase())
}
}
/// Requires the `alloc` feature.
#[cfg(feature = "alloc")]
impl core::fmt::Debug for DnsNameRef<'_> {
fn fmt(&self, f: &mut core::fmt::Formatter) -> Result<(), core::fmt::Error> {
let lowercase = self.clone().to_owned();
f.debug_tuple("DnsNameRef").field(&lowercase.0).finish()
}
}
impl<'a> From<DnsNameRef<'a>> for &'a str {
fn from(DnsNameRef(d): DnsNameRef<'a>) -> Self {
// The unwrap won't fail because DnsNameRefs are guaranteed to be ASCII
// and ASCII is a subset of UTF-8.
core::str::from_utf8(d).unwrap()
}
}
pub(super) fn presented_id_matches_reference_id(
presented_dns_id: untrusted::Input,
reference_dns_id: untrusted::Input,
) -> Option<bool> {
presented_id_matches_reference_id_internal(
presented_dns_id,
IdRole::Reference,
reference_dns_id,
)
}
pub(super) fn presented_id_matches_constraint(
presented_dns_id: untrusted::Input,
reference_dns_id: untrusted::Input,
) -> Option<bool> {
presented_id_matches_reference_id_internal(
presented_dns_id,
IdRole::NameConstraint,
reference_dns_id,
)
}
// We do not distinguish between a syntactically-invalid presented_dns_id and
// one that is syntactically valid but does not match reference_dns_id; in both
// cases, the result is false.
//
// We assume that both presented_dns_id and reference_dns_id are encoded in
// such a way that US-ASCII (7-bit) characters are encoded in one byte and no
// encoding of a non-US-ASCII character contains a code point in the range
// 0-127. For example, UTF-8 is OK but UTF-16 is not.
//
// RFC6125 says that a wildcard label may be of the form <x>*<y>.<DNSID>, where
// <x> and/or <y> may be empty. However, NSS requires <y> to be empty, and we
// follow NSS's stricter policy by accepting wildcards only of the form
// <x>*.<DNSID>, where <x> may be empty.
//
// An relative presented DNS ID matches both an absolute reference ID and a
// relative reference ID. Absolute presented DNS IDs are not supported:
//
// Presented ID Reference ID Result
// -------------------------------------
// example.com example.com Match
// example.com. example.com Mismatch
// example.com example.com. Match
// example.com. example.com. Mismatch
//
// There are more subtleties documented inline in the code.
//
// Name constraints ///////////////////////////////////////////////////////////
//
// This is all RFC 5280 has to say about dNSName constraints:
//
// DNS name restrictions are expressed as host.example.com. Any DNS
// name that can be constructed by simply adding zero or more labels to
// the left-hand side of the name satisfies the name constraint. For
// example, www.host.example.com would satisfy the constraint but
// host1.example.com would not.
//
// This lack of specificity has lead to a lot of uncertainty regarding
// subdomain matching. In particular, the following questions have been
// raised and answered:
//
// Q: Does a presented identifier equal (case insensitive) to the name
// constraint match the constraint? For example, does the presented
// ID "host.example.com" match a "host.example.com" constraint?
// A: Yes. RFC5280 says "by simply adding zero or more labels" and this
// is the case of adding zero labels.
//
// Q: When the name constraint does not start with ".", do subdomain
// presented identifiers match it? For example, does the presented
// ID "www.host.example.com" match a "host.example.com" constraint?
// A: Yes. RFC5280 says "by simply adding zero or more labels" and this
// is the case of adding more than zero labels. The example is the
// one from RFC 5280.
//
// Q: When the name constraint does not start with ".", does a
// non-subdomain prefix match it? For example, does "bigfoo.bar.com"
// match "foo.bar.com"? [4]
// A: No. We interpret RFC 5280's language of "adding zero or more labels"
// to mean that whole labels must be prefixed.
//
// (Note that the above three scenarios are the same as the RFC 6265
// domain matching rules [0].)
//
// Q: Is a name constraint that starts with "." valid, and if so, what
// semantics does it have? For example, does a presented ID of
// "www.example.com" match a constraint of ".example.com"? Does a
// presented ID of "example.com" match a constraint of ".example.com"?
// A: This implementation, NSS[1], and SChannel[2] all support a
// leading ".", but OpenSSL[3] does not yet. Amongst the
// implementations that support it, a leading "." is legal and means
// the same thing as when the "." is omitted, EXCEPT that a
// presented identifier equal (case insensitive) to the name
// constraint is not matched; i.e. presented dNSName identifiers
// must be subdomains. Some CAs in Mozilla's CA program (e.g. HARICA)
// have name constraints with the leading "." in their root
// certificates. The name constraints imposed on DCISS by Mozilla also
// have the it, so supporting this is a requirement for backward
// compatibility, even if it is not yet standardized. So, for example, a
// presented ID of "www.example.com" matches a constraint of
// ".example.com" but a presented ID of "example.com" does not.
//
// Q: Is there a way to prevent subdomain matches?
// A: Yes.
//
// Some people have proposed that dNSName constraints that do not
// start with a "." should be restricted to exact (case insensitive)
// matches. However, such a change of semantics from what RFC5280
// specifies would be a non-backward-compatible change in the case of
// permittedSubtrees constraints, and it would be a security issue for
// excludedSubtrees constraints.
//
// However, it can be done with a combination of permittedSubtrees and
// excludedSubtrees, e.g. "example.com" in permittedSubtrees and
// ".example.com" in excludedSubtrees.
//
// Q: Are name constraints allowed to be specified as absolute names?
// For example, does a presented ID of "example.com" match a name
// constraint of "example.com." and vice versa.
// A: Absolute names are not supported as presented IDs or name
// constraints. Only reference IDs may be absolute.
//
// Q: Is "" a valid dNSName constraint? If so, what does it mean?
// A: Yes. Any valid presented dNSName can be formed "by simply adding zero
// or more labels to the left-hand side" of "". In particular, an
// excludedSubtrees dNSName constraint of "" forbids all dNSNames.
//
// Q: Is "." a valid dNSName constraint? If so, what does it mean?
// A: No, because absolute names are not allowed (see above).
//
// [0] RFC 6265 (Cookies) Domain Matching rules:
// http://tools.ietf.org/html/rfc6265#section-5.1.3
// [1] NSS source code:
// https://mxr.mozilla.org/nss/source/lib/certdb/genname.c?rev=2a7348f013cb#1209
// [2] Description of SChannel's behavior from Microsoft:
// http://www.imc.org/ietf-pkix/mail-archive/msg04668.html
// [3] Proposal to add such support to OpenSSL:
// http://www.mail-archive.com/openssl-dev%40openssl.org/msg36204.html
// https://rt.openssl.org/Ticket/Display.html?id=3562
// [4] Feedback on the lack of clarify in the definition that never got
// incorporated into the spec:
// https://www.ietf.org/mail-archive/web/pkix/current/msg21192.html
fn presented_id_matches_reference_id_internal(
presented_dns_id: untrusted::Input,
reference_dns_id_role: IdRole,
reference_dns_id: untrusted::Input,
) -> Option<bool> {
if !is_valid_dns_id(presented_dns_id, IdRole::Presented, AllowWildcards::Yes) {
return None;
}
if !is_valid_dns_id(reference_dns_id, reference_dns_id_role, AllowWildcards::No) {
return None;
}
let mut presented = untrusted::Reader::new(presented_dns_id);
let mut reference = untrusted::Reader::new(reference_dns_id);
match reference_dns_id_role {
IdRole::Reference => (),
IdRole::NameConstraint if presented_dns_id.len() > reference_dns_id.len() => {
if reference_dns_id.is_empty() {
// An empty constraint matches everything.
return Some(true);
}
// If the reference ID starts with a dot then skip the prefix of
// the presented ID and start the comparison at the position of
// that dot. Examples:
//
// Matches Doesn't Match
// -----------------------------------------------------------
// original presented ID: www.example.com badexample.com
// skipped: www ba
// presented ID w/o prefix: .example.com dexample.com
// reference ID: .example.com .example.com
//
// If the reference ID does not start with a dot then we skip
// the prefix of the presented ID but also verify that the
// prefix ends with a dot. Examples:
//
// Matches Doesn't Match
// -----------------------------------------------------------
// original presented ID: www.example.com badexample.com
// skipped: www ba
// must be '.': . d
// presented ID w/o prefix: example.com example.com
// reference ID: example.com example.com
//
if reference.peek(b'.') {
if presented
.skip(presented_dns_id.len() - reference_dns_id.len())
.is_err()
{
unreachable!();
}
} else {
if presented
.skip(presented_dns_id.len() - reference_dns_id.len() - 1)
.is_err()
{
unreachable!();
}
if presented.read_byte() != Ok(b'.') {
return Some(false);
}
}
}
IdRole::NameConstraint => (),
IdRole::Presented => unreachable!(),
}
// Only allow wildcard labels that consist only of '*'.
if presented.peek(b'*') {
if presented.skip(1).is_err() {
unreachable!();
}
loop {
if reference.read_byte().is_err() {
return Some(false);
}
if reference.peek(b'.') {
break;
}
}
}
loop {
let presented_byte = match (presented.read_byte(), reference.read_byte()) {
(Ok(p), Ok(r)) if ascii_lower(p) == ascii_lower(r) => p,
_ => {
return Some(false);
}
};
if presented.at_end() {
// Don't allow presented IDs to be absolute.
if presented_byte == b'.' {
return None;
}
break;
}
}
// Allow a relative presented DNS ID to match an absolute reference DNS ID,
// unless we're matching a name constraint.
if !reference.at_end() {
if reference_dns_id_role != IdRole::NameConstraint {
match reference.read_byte() {
Ok(b'.') => (),
_ => {
return Some(false);
}
};
}
if !reference.at_end() {
return Some(false);
}
}
assert!(presented.at_end());
assert!(reference.at_end());
Some(true)
}
#[inline]
fn ascii_lower(b: u8) -> u8 {
match b {
b'A'..=b'Z' => b + b'a' - b'A',
_ => b,
}
}
#[derive(Clone, Copy, PartialEq)]
enum AllowWildcards {
No,
Yes,
}
#[derive(Clone, Copy, PartialEq)]
enum IdRole {
Reference,
Presented,
NameConstraint,
}
fn is_valid_reference_dns_id(hostname: untrusted::Input) -> bool {
is_valid_dns_id(hostname, IdRole::Reference, AllowWildcards::No)
}
// https://tools.ietf.org/html/rfc5280#section-4.2.1.6:
//
// When the subjectAltName extension contains a domain name system
// label, the domain name MUST be stored in the dNSName (an IA5String).
// The name MUST be in the "preferred name syntax", as specified by
// Section 3.5 of [RFC1034] and as modified by Section 2.1 of
// [RFC1123].
//
// https://bugzilla.mozilla.org/show_bug.cgi?id=1136616: As an exception to the
// requirement above, underscores are also allowed in names for compatibility.
fn is_valid_dns_id(
hostname: untrusted::Input,
id_role: IdRole,
allow_wildcards: AllowWildcards,
) -> bool {
// https://blogs.msdn.microsoft.com/oldnewthing/20120412-00/?p=7873/
if hostname.len() > 253 {
return false;
}
let mut input = untrusted::Reader::new(hostname);
if id_role == IdRole::NameConstraint && input.at_end() {
return true;
}
let mut dot_count = 0;
let mut label_length = 0;
let mut label_is_all_numeric = false;
let mut label_ends_with_hyphen = false;
// Only presented IDs are allowed to have wildcard labels. And, like
// Chromium, be stricter than RFC 6125 requires by insisting that a
// wildcard label consist only of '*'.
let is_wildcard = allow_wildcards == AllowWildcards::Yes && input.peek(b'*');
let mut is_first_byte = !is_wildcard;
if is_wildcard {
if input.read_byte() != Ok(b'*') || input.read_byte() != Ok(b'.') {
return false;
}
dot_count += 1;
}
loop {
const MAX_LABEL_LENGTH: usize = 63;
match input.read_byte() {
Ok(b'-') => {
if label_length == 0 {
return false; // Labels must not start with a hyphen.
}
label_is_all_numeric = false;
label_ends_with_hyphen = true;
label_length += 1;
if label_length > MAX_LABEL_LENGTH {
return false;
}
}
Ok(b'0'..=b'9') => {
if label_length == 0 {
label_is_all_numeric = true;
}
label_ends_with_hyphen = false;
label_length += 1;
if label_length > MAX_LABEL_LENGTH {
return false;
}
}
Ok(b'a'..=b'z') | Ok(b'A'..=b'Z') | Ok(b'_') => {
label_is_all_numeric = false;
label_ends_with_hyphen = false;
label_length += 1;
if label_length > MAX_LABEL_LENGTH {
return false;
}
}
Ok(b'.') => {
dot_count += 1;
if label_length == 0 && (id_role != IdRole::NameConstraint || !is_first_byte) {
return false;
}
if label_ends_with_hyphen {
return false; // Labels must not end with a hyphen.
}
label_length = 0;
}
_ => {
return false;
}
}
is_first_byte = false;
if input.at_end() {
break;
}
}
// Only reference IDs, not presented IDs or name constraints, may be
// absolute.
if label_length == 0 && id_role != IdRole::Reference {
return false;
}
if label_ends_with_hyphen {
return false; // Labels must not end with a hyphen.
}
if label_is_all_numeric {
return false; // Last label must not be all numeric.
}
if is_wildcard {
// If the DNS ID ends with a dot, the last dot signifies an absolute ID.
let label_count = if label_length == 0 {
dot_count
} else {
dot_count + 1
};
// Like NSS, require at least two labels to follow the wildcard label.
// TODO: Allow the TrustDomain to control this on a per-eTLD+1 basis,
// similar to Chromium. Even then, it might be better to still enforce
// that there are at least two labels after the wildcard.
if label_count < 3 {
return false;
}
}
true
}
#[cfg(test)]
mod tests {
use super::*;
const PRESENTED_MATCHES_REFERENCE: &[(&[u8], &[u8], Option<bool>)] = &[
(b"", b"a", None),
(b"a", b"a", Some(true)),
(b"b", b"a", Some(false)),
(b"*.b.a", b"c.b.a", Some(true)),
(b"*.b.a", b"b.a", Some(false)),
(b"*.b.a", b"b.a.", Some(false)),
// Wildcard not in leftmost label
(b"d.c.b.a", b"d.c.b.a", Some(true)),
(b"d.*.b.a", b"d.c.b.a", None),
(b"d.c*.b.a", b"d.c.b.a", None),
(b"d.c*.b.a", b"d.cc.b.a", None),
// case sensitivity
(
b"abcdefghijklmnopqrstuvwxyz",
b"ABCDEFGHIJKLMNOPQRSTUVWXYZ",
Some(true),
),
(
b"ABCDEFGHIJKLMNOPQRSTUVWXYZ",
b"abcdefghijklmnopqrstuvwxyz",
Some(true),
),
(b"aBc", b"Abc", Some(true)),
// digits
(b"a1", b"a1", Some(true)),
// A trailing dot indicates an absolute name, and absolute names can match
// relative names, and vice-versa.
(b"example", b"example", Some(true)),
(b"example.", b"example.", None),
(b"example", b"example.", Some(true)),
(b"example.", b"example", None),
(b"example.com", b"example.com", Some(true)),
(b"example.com.", b"example.com.", None),
(b"example.com", b"example.com.", Some(true)),
(b"example.com.", b"example.com", None),
(b"example.com..", b"example.com.", None),
(b"example.com..", b"example.com", None),
(b"example.com...", b"example.com.", None),
// xn-- IDN prefix
(b"x*.b.a", b"xa.b.a", None),
(b"x*.b.a", b"xna.b.a", None),
(b"x*.b.a", b"xn-a.b.a", None),
(b"x*.b.a", b"xn--a.b.a", None),
(b"xn*.b.a", b"xn--a.b.a", None),
(b"xn-*.b.a", b"xn--a.b.a", None),
(b"xn--*.b.a", b"xn--a.b.a", None),
(b"xn*.b.a", b"xn--a.b.a", None),
(b"xn-*.b.a", b"xn--a.b.a", None),
(b"xn--*.b.a", b"xn--a.b.a", None),
(b"xn---*.b.a", b"xn--a.b.a", None),
// "*" cannot expand to nothing.
(b"c*.b.a", b"c.b.a", None),
// --------------------------------------------------------------------------
// The rest of these are test cases adapted from Chromium's
// x509_certificate_unittest.cc. The parameter order is the opposite in
// Chromium's tests. Also, they some tests were modified to fit into this
// framework or due to intentional differences between mozilla::pkix and
// Chromium.
(b"foo.com", b"foo.com", Some(true)),
(b"f", b"f", Some(true)),
(b"i", b"h", Some(false)),
(b"*.foo.com", b"bar.foo.com", Some(true)),
(b"*.test.fr", b"www.test.fr", Some(true)),
(b"*.test.FR", b"wwW.tESt.fr", Some(true)),
(b".uk", b"f.uk", None),
(b"?.bar.foo.com", b"w.bar.foo.com", None),
(b"(www|ftp).foo.com", b"www.foo.com", None), // regex!
(b"www.foo.com\0", b"www.foo.com", None),
(b"www.foo.com\0*.foo.com", b"www.foo.com", None),
(b"ww.house.example", b"www.house.example", Some(false)),
(b"www.test.org", b"test.org", Some(false)),
(b"*.test.org", b"test.org", Some(false)),
(b"*.org", b"test.org", None),
// '*' must be the only character in the wildcard label
(b"w*.bar.foo.com", b"w.bar.foo.com", None),
(b"ww*ww.bar.foo.com", b"www.bar.foo.com", None),
(b"ww*ww.bar.foo.com", b"wwww.bar.foo.com", None),
(b"w*w.bar.foo.com", b"wwww.bar.foo.com", None),
(b"w*w.bar.foo.c0m", b"wwww.bar.foo.com", None),
(b"wa*.bar.foo.com", b"WALLY.bar.foo.com", None),
(b"*Ly.bar.foo.com", b"wally.bar.foo.com", None),
// Chromium does URL decoding of the reference ID, but we don't, and we also
// require that the reference ID is valid, so we can't test these two.
// (b"www.foo.com", b"ww%57.foo.com", Some(true)),
// (b"www&.foo.com", b"www%26.foo.com", Some(true)),
(b"*.test.de", b"www.test.co.jp", Some(false)),
(b"*.jp", b"www.test.co.jp", None),
(b"www.test.co.uk", b"www.test.co.jp", Some(false)),
(b"www.*.co.jp", b"www.test.co.jp", None),
(b"www.bar.foo.com", b"www.bar.foo.com", Some(true)),
(b"*.foo.com", b"www.bar.foo.com", Some(false)),
(b"*.*.foo.com", b"www.bar.foo.com", None),
// Our matcher requires the reference ID to be a valid DNS name, so we cannot
// test this case.
// (b"*.*.bar.foo.com", b"*..bar.foo.com", Some(false)),
(b"www.bath.org", b"www.bath.org", Some(true)),
// Our matcher requires the reference ID to be a valid DNS name, so we cannot
// test these cases.
// DNS_ID_MISMATCH("www.bath.org", ""),
// (b"www.bath.org", b"20.30.40.50", Some(false)),
// (b"www.bath.org", b"66.77.88.99", Some(false)),
// IDN tests
(
b"xn--poema-9qae5a.com.br",
b"xn--poema-9qae5a.com.br",
Some(true),
),
(
b"*.xn--poema-9qae5a.com.br",
b"www.xn--poema-9qae5a.com.br",
Some(true),
),
(
b"*.xn--poema-9qae5a.com.br",
b"xn--poema-9qae5a.com.br",
Some(false),
),
(b"xn--poema-*.com.br", b"xn--poema-9qae5a.com.br", None),
(b"xn--*-9qae5a.com.br", b"xn--poema-9qae5a.com.br", None),
(b"*--poema-9qae5a.com.br", b"xn--poema-9qae5a.com.br", None),
// The following are adapted from the examples quoted from
// http://tools.ietf.org/html/rfc6125#section-6.4.3
// (e.g., *.example.com would match foo.example.com but
// not bar.foo.example.com or example.com).
(b"*.example.com", b"foo.example.com", Some(true)),
(b"*.example.com", b"bar.foo.example.com", Some(false)),
(b"*.example.com", b"example.com", Some(false)),
(b"baz*.example.net", b"baz1.example.net", None),
(b"*baz.example.net", b"foobaz.example.net", None),
(b"b*z.example.net", b"buzz.example.net", None),
// Wildcards should not be valid for public registry controlled domains,
// and unknown/unrecognized domains, at least three domain components must
// be present. For mozilla::pkix and NSS, there must always be at least two
// labels after the wildcard label.
(b"*.test.example", b"www.test.example", Some(true)),
(b"*.example.co.uk", b"test.example.co.uk", Some(true)),
(b"*.example", b"test.example", None),
// The result is different than Chromium, because Chromium takes into account
// the additional knowledge it has that "co.uk" is a TLD. mozilla::pkix does
// not know that.
(b"*.co.uk", b"example.co.uk", Some(true)),
(b"*.com", b"foo.com", None),
(b"*.us", b"foo.us", None),
(b"*", b"foo", None),
// IDN variants of wildcards and registry controlled domains.
(
b"*.xn--poema-9qae5a.com.br",
b"www.xn--poema-9qae5a.com.br",
Some(true),
),
(
b"*.example.xn--mgbaam7a8h",
b"test.example.xn--mgbaam7a8h",
Some(true),
),
// RFC6126 allows this, and NSS accepts it, but Chromium disallows it.
// TODO: File bug against Chromium.
(b"*.com.br", b"xn--poema-9qae5a.com.br", Some(true)),
(b"*.xn--mgbaam7a8h", b"example.xn--mgbaam7a8h", None),
// Wildcards should be permissible for 'private' registry-controlled
// domains. (In mozilla::pkix, we do not know if it is a private registry-
// controlled domain or not.)
(b"*.appspot.com", b"www.appspot.com", Some(true)),
(b"*.s3.amazonaws.com", b"foo.s3.amazonaws.com", Some(true)),
// Multiple wildcards are not valid.
(b"*.*.com", b"foo.example.com", None),
(b"*.bar.*.com", b"foo.bar.example.com", None),
// Absolute vs relative DNS name tests. Although not explicitly specified
// in RFC 6125, absolute reference names (those ending in a .) should
// match either absolute or relative presented names.
// TODO: File errata against RFC 6125 about this.
(b"foo.com.", b"foo.com", None),
(b"foo.com", b"foo.com.", Some(true)),
(b"foo.com.", b"foo.com.", None),
(b"f.", b"f", None),
(b"f", b"f.", Some(true)),
(b"f.", b"f.", None),
(b"*.bar.foo.com.", b"www-3.bar.foo.com", None),
(b"*.bar.foo.com", b"www-3.bar.foo.com.", Some(true)),
(b"*.bar.foo.com.", b"www-3.bar.foo.com.", None),
// We require the reference ID to be a valid DNS name, so we cannot test this
// case.
// (b".", b".", Some(false)),
(b"*.com.", b"example.com", None),
(b"*.com", b"example.com.", None),
(b"*.com.", b"example.com.", None),
(b"*.", b"foo.", None),
(b"*.", b"foo", None),
// The result is different than Chromium because we don't know that co.uk is
// a TLD.
(b"*.co.uk.", b"foo.co.uk", None),
(b"*.co.uk.", b"foo.co.uk.", None),
];
#[test]
fn presented_matches_reference_test() {
for &(presented, reference, expected_result) in PRESENTED_MATCHES_REFERENCE {
let actual_result = presented_id_matches_reference_id(
untrusted::Input::from(presented),
untrusted::Input::from(reference),
);
assert_eq!(
actual_result,
expected_result,
"presented_dns_id_matches_reference_dns_id(\"{:?}\", IDRole::ReferenceID, \"{:?}\")",
presented,
reference
);
}
}
}