| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/webpki-0.21.4/src/cert.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>cert.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../webpki/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../webpki/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="comment">// Copyright 2015 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. |
| |
| </span><span class="kw">use crate</span>::{der, signed_data, Error}; |
| |
| <span class="kw">pub enum </span>EndEntityOrCA<<span class="lifetime">'a</span>> { |
| EndEntity, |
| CA(<span class="kw-2">&</span><span class="lifetime">'a </span>Cert<<span class="lifetime">'a</span>>), |
| } |
| |
| <span class="kw">pub struct </span>Cert<<span class="lifetime">'a</span>> { |
| <span class="kw">pub </span>ee_or_ca: EndEntityOrCA<<span class="lifetime">'a</span>>, |
| |
| <span class="kw">pub </span>signed_data: signed_data::SignedData<<span class="lifetime">'a</span>>, |
| <span class="kw">pub </span>issuer: untrusted::Input<<span class="lifetime">'a</span>>, |
| <span class="kw">pub </span>validity: untrusted::Input<<span class="lifetime">'a</span>>, |
| <span class="kw">pub </span>subject: untrusted::Input<<span class="lifetime">'a</span>>, |
| <span class="kw">pub </span>spki: der::Value<<span class="lifetime">'a</span>>, |
| |
| <span class="kw">pub </span>basic_constraints: <span class="prelude-ty">Option</span><untrusted::Input<<span class="lifetime">'a</span>>>, |
| <span class="kw">pub </span>eku: <span class="prelude-ty">Option</span><untrusted::Input<<span class="lifetime">'a</span>>>, |
| <span class="kw">pub </span>name_constraints: <span class="prelude-ty">Option</span><untrusted::Input<<span class="lifetime">'a</span>>>, |
| <span class="kw">pub </span>subject_alt_name: <span class="prelude-ty">Option</span><untrusted::Input<<span class="lifetime">'a</span>>>, |
| } |
| |
| <span class="kw">pub fn </span>parse_cert<<span class="lifetime">'a</span>>( |
| cert_der: untrusted::Input<<span class="lifetime">'a</span>>, ee_or_ca: EndEntityOrCA<<span class="lifetime">'a</span>>, |
| ) -> <span class="prelude-ty">Result</span><Cert<<span class="lifetime">'a</span>>, Error> { |
| parse_cert_internal(cert_der, ee_or_ca, certificate_serial_number) |
| } |
| |
| <span class="doccomment">/// Used by `parse_cert` for regular certificates (end-entity and intermediate) |
| /// and by `cert_der_as_trust_anchor` for trust anchors encoded as |
| /// certificates. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>parse_cert_internal<<span class="lifetime">'a</span>>( |
| cert_der: untrusted::Input<<span class="lifetime">'a</span>>, ee_or_ca: EndEntityOrCA<<span class="lifetime">'a</span>>, |
| serial_number: <span class="kw">fn</span>(input: <span class="kw-2">&mut </span>untrusted::Reader<<span class="lifetime">'_</span>>) -> <span class="prelude-ty">Result</span><(), Error>, |
| ) -> <span class="prelude-ty">Result</span><Cert<<span class="lifetime">'a</span>>, Error> { |
| <span class="kw">let </span>(tbs, signed_data) = cert_der.read_all(Error::BadDER, |cert_der| { |
| der::nested( |
| cert_der, |
| der::Tag::Sequence, |
| Error::BadDER, |
| signed_data::parse_signed_data, |
| ) |
| })<span class="question-mark">?</span>; |
| |
| tbs.read_all(Error::BadDER, |tbs| { |
| version3(tbs)<span class="question-mark">?</span>; |
| serial_number(tbs)<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>signature = der::expect_tag_and_get_value(tbs, der::Tag::Sequence)<span class="question-mark">?</span>; |
| <span class="comment">// TODO: In mozilla::pkix, the comparison is done based on the |
| // normalized value (ignoring whether or not there is an optional NULL |
| // parameter for RSA-based algorithms), so this may be too strict. |
| </span><span class="kw">if </span>signature != signed_data.algorithm { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::SignatureAlgorithmMismatch); |
| } |
| |
| <span class="kw">let </span>issuer = der::expect_tag_and_get_value(tbs, der::Tag::Sequence)<span class="question-mark">?</span>; |
| <span class="kw">let </span>validity = der::expect_tag_and_get_value(tbs, der::Tag::Sequence)<span class="question-mark">?</span>; |
| <span class="kw">let </span>subject = der::expect_tag_and_get_value(tbs, der::Tag::Sequence)<span class="question-mark">?</span>; |
| <span class="kw">let </span>spki = der::expect_tag(tbs, der::Tag::Sequence)<span class="question-mark">?</span>; |
| |
| <span class="comment">// In theory there could be fields [1] issuerUniqueID and [2] |
| // subjectUniqueID, but in practice there never are, and to keep the |
| // code small and simple we don't accept any certificates that do |
| // contain them. |
| |
| </span><span class="kw">let </span><span class="kw-2">mut </span>cert = Cert { |
| ee_or_ca, |
| |
| signed_data, |
| issuer, |
| validity, |
| subject, |
| spki, |
| |
| basic_constraints: <span class="prelude-val">None</span>, |
| eku: <span class="prelude-val">None</span>, |
| name_constraints: <span class="prelude-val">None</span>, |
| subject_alt_name: <span class="prelude-val">None</span>, |
| }; |
| |
| <span class="comment">// mozilla::pkix allows the extensions to be omitted. However, since |
| // the subjectAltName extension is mandatory, the extensions are |
| // mandatory too, and we enforce that. Also, mozilla::pkix includes |
| // special logic for handling critical Netscape Cert Type extensions. |
| // That has been intentionally omitted. |
| |
| </span>der::nested_mut( |
| tbs, |
| der::Tag::ContextSpecificConstructed3, |
| Error::BadDER, |
| |tagged| { |
| der::nested_of_mut( |
| tagged, |
| der::Tag::Sequence, |
| der::Tag::Sequence, |
| Error::BadDER, |
| |extension| { |
| <span class="kw">let </span>extn_id = der::expect_tag_and_get_value(extension, der::Tag::OID)<span class="question-mark">?</span>; |
| <span class="kw">let </span>critical = der::optional_boolean(extension)<span class="question-mark">?</span>; |
| <span class="kw">let </span>extn_value = |
| der::expect_tag_and_get_value(extension, der::Tag::OctetString)<span class="question-mark">?</span>; |
| <span class="kw">match </span>remember_extension(<span class="kw-2">&mut </span>cert, extn_id, extn_value)<span class="question-mark">? </span>{ |
| Understood::No <span class="kw">if </span>critical => <span class="prelude-val">Err</span>(Error::UnsupportedCriticalExtension), |
| <span class="kw">_ </span>=> <span class="prelude-val">Ok</span>(()), |
| } |
| }, |
| ) |
| }, |
| )<span class="question-mark">?</span>; |
| |
| <span class="prelude-val">Ok</span>(cert) |
| }) |
| } |
| |
| <span class="comment">// mozilla::pkix supports v1, v2, v3, and v4, including both the implicit |
| // (correct) and explicit (incorrect) encoding of v1. We allow only v3. |
| </span><span class="kw">fn </span>version3(input: <span class="kw-2">&mut </span>untrusted::Reader) -> <span class="prelude-ty">Result</span><(), Error> { |
| der::nested( |
| input, |
| der::Tag::ContextSpecificConstructed0, |
| Error::BadDER, |
| |input| { |
| <span class="kw">let </span>version = der::small_nonnegative_integer(input)<span class="question-mark">?</span>; |
| <span class="kw">if </span>version != <span class="number">2 </span>{ |
| <span class="comment">// v3 |
| </span><span class="kw">return </span><span class="prelude-val">Err</span>(Error::UnsupportedCertVersion); |
| } |
| <span class="prelude-val">Ok</span>(()) |
| }, |
| ) |
| } |
| |
| <span class="kw">pub fn </span>certificate_serial_number(input: <span class="kw-2">&mut </span>untrusted::Reader) -> <span class="prelude-ty">Result</span><(), Error> { |
| <span class="comment">// https://tools.ietf.org/html/rfc5280#section-4.1.2.2: |
| // * Conforming CAs MUST NOT use serialNumber values longer than 20 octets." |
| // * "The serial number MUST be a positive integer [...]" |
| |
| </span><span class="kw">let </span>value = der::positive_integer(input)<span class="question-mark">?</span>; |
| <span class="kw">if </span>value.big_endian_without_leading_zero().len() > <span class="number">20 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::BadDER); |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="kw">enum </span>Understood { |
| Yes, |
| No, |
| } |
| |
| <span class="kw">fn </span>remember_extension<<span class="lifetime">'a</span>>( |
| cert: <span class="kw-2">&mut </span>Cert<<span class="lifetime">'a</span>>, extn_id: untrusted::Input, value: untrusted::Input<<span class="lifetime">'a</span>>, |
| ) -> <span class="prelude-ty">Result</span><Understood, Error> { |
| <span class="comment">// We don't do anything with certificate policies so we can safely ignore |
| // all policy-related stuff. We assume that the policy-related extensions |
| // are not marked critical. |
| |
| // id-ce 2.5.29 |
| </span><span class="kw">static </span>ID_CE: [u8; <span class="number">2</span>] = <span class="macro">oid!</span>[<span class="number">2</span>, <span class="number">5</span>, <span class="number">29</span>]; |
| |
| <span class="kw">if </span>extn_id.len() != ID_CE.len() + <span class="number">1 </span>|| !extn_id.as_slice_less_safe().starts_with(<span class="kw-2">&</span>ID_CE) { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(Understood::No); |
| } |
| |
| <span class="kw">let </span>out = <span class="kw">match </span><span class="kw-2">*</span>extn_id.as_slice_less_safe().last().unwrap() { |
| <span class="comment">// id-ce-keyUsage 2.5.29.15. We ignore the KeyUsage extension. For CA |
| // certificates, BasicConstraints.cA makes KeyUsage redundant. Firefox |
| // and other common browsers do not check KeyUsage for end-entities, |
| // though it would be kind of nice to ensure that a KeyUsage without |
| // the keyEncipherment bit could not be used for RSA key exchange. |
| </span><span class="number">15 </span>=> { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(Understood::Yes); |
| }, |
| |
| <span class="comment">// id-ce-subjectAltName 2.5.29.17 |
| </span><span class="number">17 </span>=> <span class="kw-2">&mut </span>cert.subject_alt_name, |
| |
| <span class="comment">// id-ce-basicConstraints 2.5.29.19 |
| </span><span class="number">19 </span>=> <span class="kw-2">&mut </span>cert.basic_constraints, |
| |
| <span class="comment">// id-ce-nameConstraints 2.5.29.30 |
| </span><span class="number">30 </span>=> <span class="kw-2">&mut </span>cert.name_constraints, |
| |
| <span class="comment">// id-ce-extKeyUsage 2.5.29.37 |
| </span><span class="number">37 </span>=> <span class="kw-2">&mut </span>cert.eku, |
| |
| <span class="kw">_ </span>=> { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(Understood::No); |
| }, |
| }; |
| |
| <span class="kw">match </span><span class="kw-2">*</span>out { |
| <span class="prelude-val">Some</span>(..) => { |
| <span class="comment">// The certificate contains more than one instance of this |
| // extension. |
| </span><span class="kw">return </span><span class="prelude-val">Err</span>(Error::ExtensionValueInvalid); |
| }, |
| <span class="prelude-val">None </span>=> { |
| <span class="comment">// All the extensions that we care about are wrapped in a SEQUENCE. |
| </span><span class="kw">let </span>sequence_value = value.read_all(Error::BadDER, |value| { |
| der::expect_tag_and_get_value(value, der::Tag::Sequence) |
| })<span class="question-mark">?</span>; |
| <span class="kw-2">*</span>out = <span class="prelude-val">Some</span>(sequence_value); |
| }, |
| } |
| |
| <span class="prelude-val">Ok</span>(Understood::Yes) |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="webpki" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |