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+// Copyright (C) 2021 Scott Lamb <slamb@slamb.org>
+// SPDX-License-Identifier: MIT OR Apache-2.0
+
+//! `Digest` authentication scheme, as in
+//! [RFC 7616](https://datatracker.ietf.org/doc/html/rfc7616).
+
+use std::{convert::TryFrom, fmt::Write as _, io::Write as _};
+
+use digest::Digest;
+
+use crate::{
+ char_classes, ChallengeRef, ParamValue, PasswordParams, C_ATTR, C_ESCAPABLE, C_QDTEXT,
+};
+
+/// "Quality of protection" value.
+///
+/// The values here can be used in a bitmask as in [`DigestClient::qop`].
+#[derive(Copy, Clone, Debug)]
+#[repr(u8)]
+#[non_exhaustive]
+pub enum Qop {
+ /// Authentication.
+ Auth = 1,
+
+ /// Authentication with integrity protection.
+ ///
+ /// "Integrity protection" means protection of the request entity body.
+ AuthInt = 2,
+}
+
+impl Qop {
+ /// Returns a string form as expected over the wire.
+ fn as_str(self) -> &'static str {
+ match self {
+ Qop::Auth => "auth",
+ Qop::AuthInt => "auth-int",
+ }
+ }
+}
+
+/// A set of zero or more [`Qop`]s.
+#[derive(Copy, Clone, PartialEq, Eq)]
+pub struct QopSet(u8);
+
+impl std::fmt::Debug for QopSet {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+ let mut l = f.debug_set();
+ if (self.0 & Qop::Auth as u8) != 0 {
+ l.entry(&"auth");
+ }
+ if (self.0 & Qop::AuthInt as u8) != 0 {
+ l.entry(&"auth-int");
+ }
+ l.finish()
+ }
+}
+
+impl std::ops::BitAnd<Qop> for QopSet {
+ type Output = bool;
+
+ fn bitand(self, rhs: Qop) -> Self::Output {
+ (self.0 & (rhs as u8)) != 0
+ }
+}
+
+/// Client for a `Digest` challenge, as in [RFC 7616](https://datatracker.ietf.org/doc/html/rfc7616).
+///
+/// Most of the information here is taken from the `WWW-Authenticate` or
+/// `Proxy-Authenticate` header. This also internally maintains a nonce counter.
+///
+/// ## Implementation notes
+///
+/// * Recalculates `H(A1)` on each [`DigestClient::respond`] call. It'd be
+/// more CPU-efficient to calculate `H(A1)` only once by supplying the
+/// username and password at construction time or by caching (username,
+/// password) -> `H(A1)` mappings internally. `DigestClient` prioritizes
+/// simplicity instead.
+/// * There's no support yet for parsing the `Authentication-Info` and
+/// `Proxy-Authentication-Info` header fields described by [RFC 7616 section
+/// 3.5](https://datatracker.ietf.org/doc/html/rfc7616#section-3.5).
+/// PRs welcome!
+/// * Always responds using `UTF-8`, and thus doesn't use or keep around the `charset`
+/// parameter. The RFC only allows that parameter to be set to `UTF-8` anyway.
+/// * Supports [RFC 2069](https://datatracker.ietf.org/doc/html/rfc2069) compatibility as in
+/// [RFC 2617 section 3.2.2.1](https://datatracker.ietf.org/doc/html/rfc2617#section-3.2.2.1),
+/// even though RFC 7616 drops it. There are still RTSP cameras being sold
+/// in 2021 that use the RFC 2069-style calculations.
+/// * Supports RFC 7616 `userhash`, even though it seems impractical and only
+/// marginally useful. The server must index the userhash for each supported
+/// algorithm or calculate it on-the-fly for all users in the database.
+/// * The `-sess` algorithm variants haven't been tested; there's no example
+/// in the RFCs.
+///
+/// ## Security considerations
+///
+/// We strongly advise *servers* against implementing `Digest`:
+///
+/// * It's actively harmful in that it prevents the server from securing their
+/// password storage via salted password hashes. See [RFC 7616 Section
+/// 5.2](https://datatracker.ietf.org/doc/html/rfc7616#section-5.2).
+/// When your server offers `Digest` authentication, it is advertising that
+/// it stores plaintext passwords!
+/// * It's no replacement for TLS in terms of protecting confidentiality of
+/// the password, much less confidentiality of any other information.
+///
+/// For *clients*, when a server supports both `Digest` and `Basic`, we advise
+/// using `Digest`. It provides (slightly) more confidentiality of passwords
+/// over the wire.
+///
+/// Some servers *only* support `Digest`. E.g.,
+/// [ONVIF](https://www.onvif.org/profiles/specifications/) mandates the
+/// `Digest` scheme. It doesn't prohibit implementing other schemes, but some
+/// cameras meet the specification's requirement and do no more.
+#[derive(Eq, PartialEq)]
+pub struct DigestClient {
+ /// Holds unescaped versions of all string fields.
+ ///
+ /// Using a single `String` minimizes the size of the `DigestClient`
+ /// itself and/or any option/enum it may be wrapped in. It also minimizes
+ /// padding bytes after each allocation. The fields as stored as follows:
+ ///
+ /// 1. `realm`: `[0, domain_start)`
+ /// 2. `domain`: `[domain_start, opaque_start)`
+ /// 3. `opaque`: `[opaque_start, nonce_start)`
+ /// 4. `nonce`: `[nonce_start, buf.len())`
+ buf: Box<str>,
+
+ // Positions described in `buf` comment above. See respective methods' doc
+ // comments for more information. These are stored as `u16` to save space,
+ // and because it's unreasonable for them to be large.
+ domain_start: u16,
+ opaque_start: u16,
+ nonce_start: u16,
+
+ // Non-string fields. See respective methods' doc comments for more information.
+ algorithm: Algorithm,
+ session: bool,
+ stale: bool,
+ rfc2069_compat: bool,
+ userhash: bool,
+ qop: QopSet,
+ nc: u32,
+}
+
+impl DigestClient {
+ /// Returns a string to be displayed to users so they know which username
+ /// and password to use.
+ ///
+ /// This string should contain at least the name of
+ /// the host performing the authentication and might additionally
+ /// indicate the collection of users who might have access. An
+ /// example is `registered_users@example.com`. (See [Section 2.2 of
+ /// RFC 7235](https://datatracker.ietf.org/doc/html/rfc7235#section-2.2) for
+ /// more details.)
+ #[inline]
+ pub fn realm(&self) -> &str {
+ &self.buf[..self.domain_start as usize]
+ }
+
+ /// Returns the domain, a space-separated list of URIs, as specified in RFC
+ /// 3986, that define the protection space.
+ ///
+ /// If the domain parameter is absent, returns an empty string, which is semantically
+ /// identical according to the RFC.
+ #[inline]
+ pub fn domain(&self) -> &str {
+ &self.buf[self.domain_start as usize..self.opaque_start as usize]
+ }
+
+ /// Returns the nonce, a server-specified string which should be uniquely
+ /// generated each time a 401 response is made.
+ #[inline]
+ pub fn nonce(&self) -> &str {
+ &self.buf[self.nonce_start as usize..]
+ }
+
+ /// Returns string of data, specified by the server, that SHOULD be returned
+ /// by the client unchanged in the Authorization header field of subsequent
+ /// requests with URIs in the same protection space.
+ ///
+ /// Currently an empty `opaque` is treated as an absent one.
+ #[inline]
+ pub fn opaque(&self) -> Option<&str> {
+ if self.opaque_start == self.nonce_start {
+ None
+ } else {
+ Some(&self.buf[self.opaque_start as usize..self.nonce_start as usize])
+ }
+ }
+
+ /// Returns a flag indicating that the previous request from the client was
+ /// rejected because the nonce value was stale.
+ #[inline]
+ pub fn stale(&self) -> bool {
+ self.stale
+ }
+
+ /// Returns true if using [RFC 2069](https://datatracker.ietf.org/doc/html/rfc2069)
+ /// compatibility mode as in [RFC 2617 section
+ /// 3.2.2.1](https://datatracker.ietf.org/doc/html/rfc2617#section-3.2.2.1).
+ ///
+ /// If so, `request-digest` is calculated without the nonce count, conce, or qop.
+ #[inline]
+ pub fn rfc2069_compat(&self) -> bool {
+ self.rfc2069_compat
+ }
+
+ /// Returns the algorithm used to produce the digest and an unkeyed digest.
+ #[inline]
+ pub fn algorithm(&self) -> Algorithm {
+ self.algorithm
+ }
+
+ /// Returns if the session style `A1` will be used.
+ #[inline]
+ pub fn session(&self) -> bool {
+ self.session
+ }
+
+ /// Returns the acceptable `qop` (quality of protection) values.
+ #[inline]
+ pub fn qop(&self) -> QopSet {
+ self.qop
+ }
+
+ /// Returns the number of times the server-supplied nonce has been used by
+ /// [`DigestClient::respond`].
+ #[inline]
+ pub fn nonce_count(&self) -> u32 {
+ self.nc
+ }
+
+ /// Responds to the challenge with the supplied parameters.
+ ///
+ /// The caller should use the returned string as an `Authorization` or
+ /// `Proxy-Authorization` header value.
+ #[inline]
+ pub fn respond(&mut self, p: &PasswordParams) -> Result<String, String> {
+ self.respond_inner(p, &new_random_cnonce())
+ }
+
+ /// Responds using a fixed cnonce **for testing only**.
+ ///
+ /// In production code, use [`DigestClient::respond`] instead, which generates a new
+ /// random cnonce value.
+ #[inline]
+ pub fn respond_with_testing_cnonce(
+ &mut self,
+ p: &PasswordParams,
+ cnonce: &str,
+ ) -> Result<String, String> {
+ self.respond_inner(p, cnonce)
+ }
+
+ /// Helper for respond methods.
+ ///
+ /// We don't simply implement this as `respond_with_testing_cnonce` and have
+ /// `respond` delegate to that method because it'd be confusing/alarming if
+ /// that method name ever shows up in production stack traces.
+ /// and have `respond` delegate to the testing version. We don't do that because
+ fn respond_inner(&mut self, p: &PasswordParams, cnonce: &str) -> Result<String, String> {
+ let realm = self.realm();
+ let mut h_a1 = self.algorithm.h(&[
+ p.username.as_bytes(),
+ b":",
+ realm.as_bytes(),
+ b":",
+ p.password.as_bytes(),
+ ]);
+ if self.session {
+ h_a1 = self.algorithm.h(&[
+ h_a1.as_bytes(),
+ b":",
+ self.nonce().as_bytes(),
+ b":",
+ cnonce.as_bytes(),
+ ]);
+ }
+
+ // Select the best available qop and calculate H(A2) as in
+ // [https://datatracker.ietf.org/doc/html/rfc7616#section-3.4.3].
+ let (h_a2, qop);
+ if let (Some(body), true) = (p.body, self.qop & Qop::AuthInt) {
+ h_a2 = self
+ .algorithm
+ .h(&[p.method.as_bytes(), b":", p.uri.as_bytes(), b":", body]);
+ qop = Qop::AuthInt;
+ } else if self.qop & Qop::Auth {
+ h_a2 = self
+ .algorithm
+ .h(&[p.method.as_bytes(), b":", p.uri.as_bytes()]);
+ qop = Qop::Auth;
+ } else {
+ return Err("no supported/available qop".into());
+ }
+
+ let nc = self.nc.checked_add(1).ok_or("nonce count exhausted")?;
+ let mut hex_nc = [0u8; 8];
+ let _ = write!(&mut hex_nc[..], "{:08x}", nc);
+ let str_hex_nc = match std::str::from_utf8(&hex_nc[..]) {
+ Ok(h) => h,
+ Err(_) => unreachable!(),
+ };
+
+ // https://datatracker.ietf.org/doc/html/rfc2617#section-3.2.2.1
+ let response = if self.rfc2069_compat {
+ self.algorithm.h(&[
+ h_a1.as_bytes(),
+ b":",
+ self.nonce().as_bytes(),
+ b":",
+ h_a2.as_bytes(),
+ ])
+ } else {
+ self.algorithm.h(&[
+ h_a1.as_bytes(),
+ b":",
+ self.nonce().as_bytes(),
+ b":",
+ &hex_nc[..],
+ b":",
+ cnonce.as_bytes(),
+ b":",
+ qop.as_str().as_bytes(),
+ b":",
+ h_a2.as_bytes(),
+ ])
+ };
+
+ let mut out = String::with_capacity(128);
+ out.push_str("Digest ");
+ if self.userhash {
+ let hashed = self
+ .algorithm
+ .h(&[p.username.as_bytes(), b":", realm.as_bytes()]);
+ append_quoted_key_value(&mut out, "username", &hashed)?;
+ append_unquoted_key_value(&mut out, "userhash", "true");
+ } else if is_valid_quoted_value(p.username) {
+ append_quoted_key_value(&mut out, "username", p.username)?;
+ } else {
+ append_extended_key_value(&mut out, "username", p.username);
+ }
+ append_quoted_key_value(&mut out, "realm", self.realm())?;
+ append_quoted_key_value(&mut out, "uri", p.uri)?;
+ append_quoted_key_value(&mut out, "nonce", self.nonce())?;
+ if !self.rfc2069_compat {
+ append_unquoted_key_value(&mut out, "algorithm", self.algorithm.as_str(self.session));
+ append_unquoted_key_value(&mut out, "nc", str_hex_nc);
+ append_quoted_key_value(&mut out, "cnonce", cnonce)?;
+ append_unquoted_key_value(&mut out, "qop", qop.as_str());
+ }
+ append_quoted_key_value(&mut out, "response", &response)?;
+ if let Some(o) = self.opaque() {
+ append_quoted_key_value(&mut out, "opaque", o)?;
+ }
+ out.truncate(out.len() - 2); // remove final ", "
+ self.nc = nc;
+ Ok(out)
+ }
+}
+
+impl TryFrom<&ChallengeRef<'_>> for DigestClient {
+ type Error = String;
+
+ fn try_from(value: &ChallengeRef<'_>) -> Result<Self, Self::Error> {
+ if !value.scheme.eq_ignore_ascii_case("Digest") {
+ return Err(format!(
+ "DigestClientContext doesn't support challenge scheme {:?}",
+ value.scheme
+ ));
+ }
+ let mut buf_len = 0;
+ let mut unused_len = 0;
+ let mut realm = None;
+ let mut domain = None;
+ let mut nonce = None;
+ let mut opaque = None;
+ let mut stale = false;
+ let mut algorithm_and_session = None;
+ let mut qop_str = None;
+ let mut userhash_str = None;
+
+ // Parse response header field parameters as in
+ // [https://datatracker.ietf.org/doc/html/rfc7616#section-3.3].
+ for (k, v) in &value.params {
+ // Note that "stale" and "algorithm" can be directly compared
+ // without unescaping because RFC 7616 section 3.3 says "For
+ // historical reasons, a sender MUST NOT generate the quoted string
+ // syntax values for the following parameters: stale and algorithm."
+ if store_param(k, v, "realm", &mut realm, &mut buf_len)?
+ || store_param(k, v, "domain", &mut domain, &mut buf_len)?
+ || store_param(k, v, "nonce", &mut nonce, &mut buf_len)?
+ || store_param(k, v, "opaque", &mut opaque, &mut buf_len)?
+ || store_param(k, v, "qop", &mut qop_str, &mut unused_len)?
+ || store_param(k, v, "userhash", &mut userhash_str, &mut unused_len)?
+ {
+ // Do nothing here.
+ } else if k.eq_ignore_ascii_case("stale") {
+ stale = v.escaped.eq_ignore_ascii_case("true");
+ } else if k.eq_ignore_ascii_case("algorithm") {
+ algorithm_and_session = Some(Algorithm::parse(v.escaped)?);
+ }
+ }
+ let realm = realm.ok_or("missing required parameter realm")?;
+ let nonce = nonce.ok_or("missing required parameter nonce")?;
+ if buf_len > u16::MAX as usize {
+ // Incredibly unlikely, but just for completeness.
+ return Err(format!(
+ "Unescaped parameters' length {} exceeds u16::MAX!",
+ buf_len
+ ));
+ }
+
+ let algorithm_and_session = algorithm_and_session.unwrap_or((Algorithm::Md5, false));
+
+ let mut buf = String::with_capacity(buf_len);
+ let mut qop = QopSet(0);
+ let rfc2069_compat = if let Some(qop_str) = qop_str {
+ let qop_str = qop_str.unescaped_with_scratch(&mut buf);
+ for v in qop_str.split(',') {
+ let v = v.trim();
+ if v.eq_ignore_ascii_case("auth") {
+ qop.0 |= Qop::Auth as u8;
+ } else if v.eq_ignore_ascii_case("auth-int") {
+ qop.0 |= Qop::AuthInt as u8;
+ }
+ }
+ if qop.0 == 0 {
+ return Err(format!("no supported qop in {:?}", qop_str));
+ }
+ buf.clear();
+ false
+ } else {
+ // An absent qop is treated as "auth", according to
+ // https://datatracker.ietf.org/doc/html/rfc7616#section-3.4.3
+ qop.0 |= Qop::Auth as u8;
+ true
+ };
+ let userhash;
+ if let Some(userhash_str) = userhash_str {
+ let userhash_str = userhash_str.unescaped_with_scratch(&mut buf);
+ userhash = userhash_str.eq_ignore_ascii_case("true");
+ buf.clear();
+ } else {
+ userhash = false;
+ };
+ realm.append_unescaped(&mut buf);
+ let domain_start = buf.len();
+ if let Some(d) = domain {
+ d.append_unescaped(&mut buf);
+ }
+ let opaque_start = buf.len();
+ if let Some(o) = opaque {
+ o.append_unescaped(&mut buf);
+ }
+ let nonce_start = buf.len();
+ nonce.append_unescaped(&mut buf);
+ Ok(DigestClient {
+ buf: buf.into_boxed_str(),
+ domain_start: domain_start as u16,
+ opaque_start: opaque_start as u16,
+ nonce_start: nonce_start as u16,
+ algorithm: algorithm_and_session.0,
+ session: algorithm_and_session.1,
+ stale,
+ rfc2069_compat,
+ userhash,
+ qop,
+ nc: 0,
+ })
+ }
+}
+
+impl std::fmt::Debug for DigestClient {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+ f.debug_struct("DigestClient")
+ .field("realm", &self.realm())
+ .field("domain", &self.domain())
+ .field("opaque", &self.opaque())
+ .field("nonce", &self.nonce())
+ .field("algorithm", &self.algorithm.as_str(self.session))
+ .field("stale", &self.stale)
+ .field("qop", &self.qop)
+ .field("rfc2069_compat", &self.rfc2069_compat)
+ .field("userhash", &self.userhash)
+ .field("nc", &self.nc)
+ .finish()
+ }
+}
+
+/// Helper for `DigestClient::try_from` which stashes away a `&ParamValue`.
+fn store_param<'v, 'tmp>(
+ k: &'tmp str,
+ v: &'v ParamValue<'v>,
+ expected_k: &'tmp str,
+ set_v: &'tmp mut Option<&'v ParamValue<'v>>,
+ add_len: &'tmp mut usize,
+) -> Result<bool, String> {
+ if !k.eq_ignore_ascii_case(expected_k) {
+ return Ok(false);
+ }
+ if set_v.is_some() {
+ return Err(format!("duplicate parameter {:?}", k));
+ }
+ *add_len += v.unescaped_len();
+ *set_v = Some(v);
+ Ok(true)
+}
+
+fn is_valid_quoted_value(s: &str) -> bool {
+ for &b in s.as_bytes() {
+ if char_classes(b) & (C_QDTEXT | C_ESCAPABLE) == 0 {
+ return false;
+ }
+ }
+ true
+}
+
+fn append_extended_key_value(out: &mut String, key: &str, value: &str) {
+ out.push_str(key);
+ out.push_str("*=UTF-8''");
+ for &b in value.as_bytes() {
+ if (char_classes(b) & C_ATTR) != 0 {
+ out.push(char::from(b));
+ } else {
+ let _ = write!(out, "%{:02X}", b);
+ }
+ }
+ out.push_str(", ");
+}
+
+fn append_unquoted_key_value(out: &mut String, key: &str, value: &str) {
+ out.push_str(key);
+ out.push('=');
+ out.push_str(value);
+ out.push_str(", ");
+}
+
+fn append_quoted_key_value(out: &mut String, key: &str, value: &str) -> Result<(), String> {
+ out.push_str(key);
+ out.push_str("=\"");
+ let mut first_unwritten = 0;
+ let bytes = value.as_bytes();
+ for (i, &b) in bytes.iter().enumerate() {
+ // Note that bytes >= 128 are in neither C_QDTEXT nor C_ESCAPABLE, so every allowed byte
+ // is a full character.
+ let class = char_classes(b);
+ if (class & C_QDTEXT) != 0 {
+ // Just advance.
+ } else if (class & C_ESCAPABLE) != 0 {
+ out.push_str(&value[first_unwritten..i]);
+ out.push('\\');
+ out.push(char::from(b));
+ first_unwritten = i + 1;
+ } else {
+ return Err(format!("invalid {} value {:?}", key, value));
+ }
+ }
+ out.push_str(&value[first_unwritten..]);
+ out.push_str("\", ");
+ Ok(())
+}
+
+/// Supported algorithm from the [HTTP Digest Algorithm Values
+/// registry](https://www.iana.org/assignments/http-dig-alg/http-dig-alg.xhtml).
+///
+/// This doesn't store whether the session variant (`<Algorithm>-sess`) was
+/// requested; see [`DigestClient::session`] for that.
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[non_exhaustive]
+pub enum Algorithm {
+ Md5,
+ Sha256,
+ Sha512Trunc256,
+}
+
+impl Algorithm {
+ /// Parses a string into a tuple of `Algorithm` and a bool representing
+ /// whether the `-sess` suffix is present.
+ fn parse(s: &str) -> Result<(Self, bool), String> {
+ Ok(match s {
+ "MD5" => (Algorithm::Md5, false),
+ "MD5-sess" => (Algorithm::Md5, true),
+ "SHA-256" => (Algorithm::Sha256, false),
+ "SHA-256-sess" => (Algorithm::Sha256, true),
+ "SHA-512-256" => (Algorithm::Sha512Trunc256, false),
+ "SHA-512-256-sess" => (Algorithm::Sha512Trunc256, true),
+ _ => return Err(format!("unknown algorithm {:?}", s)),
+ })
+ }
+
+ fn as_str(&self, session: bool) -> &'static str {
+ match (self, session) {
+ (Algorithm::Md5, false) => "MD5",
+ (Algorithm::Md5, true) => "MD5-sess",
+ (Algorithm::Sha256, false) => "SHA-256",
+ (Algorithm::Sha256, true) => "SHA-256-sess",
+ (Algorithm::Sha512Trunc256, false) => "SHA-512-256",
+ (Algorithm::Sha512Trunc256, true) => "SHA-512-256-sess",
+ }
+ }
+
+ fn h(&self, items: &[&[u8]]) -> String {
+ match self {
+ Algorithm::Md5 => h(md5::Md5::new(), items),
+ Algorithm::Sha256 => h(sha2::Sha256::new(), items),
+ Algorithm::Sha512Trunc256 => h(sha2::Sha512_256::new(), items),
+ }
+ }
+}
+
+fn h<D: Digest>(mut d: D, items: &[&[u8]]) -> String {
+ for i in items {
+ d.update(i);
+ }
+ hex::encode(d.finalize())
+}
+
+fn new_random_cnonce() -> String {
+ let raw: [u8; 16] = rand::random();
+ hex::encode(&raw[..])
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use pretty_assertions::assert_eq;
+
+ /// Tests the example from [RFC 7616 section 3.9.1: SHA-256 and
+ /// MD5](https://datatracker.ietf.org/doc/html/rfc7616#section-3.9.1).
+ #[test]
+ fn sha256_and_md5() {
+ let www_authenticate = "\
+ Digest \
+ realm=\"http-auth@example.org\", \
+ qop=\"auth, auth-int\", \
+ algorithm=SHA-256, \
+ nonce=\"7ypf/xlj9XXwfDPEoM4URrv/xwf94BcCAzFZH4GiTo0v\", \
+ opaque=\"FQhe/qaU925kfnzjCev0ciny7QMkPqMAFRtzCUYo5tdS\", \
+ Digest \
+ realm=\"http-auth@example.org\", \
+ qop=\"auth, auth-int\", \
+ algorithm=MD5, \
+ nonce=\"7ypf/xlj9XXwfDPEoM4URrv/xwf94BcCAzFZH4GiTo0v\", \
+ opaque=\"FQhe/qaU925kfnzjCev0ciny7QMkPqMAFRtzCUYo5tdS\"";
+ let challenges = dbg!(crate::parse_challenges(www_authenticate).unwrap());
+ assert_eq!(challenges.len(), 2);
+ let ctxs: Result<Vec<_>, _> = challenges.iter().map(DigestClient::try_from).collect();
+ let mut ctxs = dbg!(ctxs.unwrap());
+ assert_eq!(ctxs[1].realm(), "http-auth@example.org");
+ assert_eq!(ctxs[1].domain(), "");
+ assert_eq!(
+ ctxs[1].nonce(),
+ "7ypf/xlj9XXwfDPEoM4URrv/xwf94BcCAzFZH4GiTo0v"
+ );
+ assert_eq!(
+ ctxs[1].opaque(),
+ Some("FQhe/qaU925kfnzjCev0ciny7QMkPqMAFRtzCUYo5tdS")
+ );
+ assert_eq!(ctxs[1].stale(), false);
+ assert_eq!(ctxs[1].algorithm(), Algorithm::Md5);
+ assert_eq!(ctxs[1].qop().0, (Qop::Auth as u8) | (Qop::AuthInt as u8));
+ assert_eq!(ctxs[1].nonce_count(), 0);
+ let params = crate::PasswordParams {
+ username: "Mufasa",
+ password: "Circle of Life",
+ uri: "/dir/index.html",
+ body: None,
+ method: "GET",
+ };
+ assert_eq!(
+ &mut ctxs[0]
+ .respond_with_testing_cnonce(
+ &params,
+ "f2/wE4q74E6zIJEtWaHKaf5wv/H5QzzpXusqGemxURZJ"
+ )
+ .unwrap(),
+ "Digest username=\"Mufasa\", \
+ realm=\"http-auth@example.org\", \
+ uri=\"/dir/index.html\", \
+ nonce=\"7ypf/xlj9XXwfDPEoM4URrv/xwf94BcCAzFZH4GiTo0v\", \
+ algorithm=SHA-256, \
+ nc=00000001, \
+ cnonce=\"f2/wE4q74E6zIJEtWaHKaf5wv/H5QzzpXusqGemxURZJ\", \
+ qop=auth, \
+ response=\"753927fa0e85d155564e2e272a28d1802ca10daf4496794697cf8db5856cb6c1\", \
+ opaque=\"FQhe/qaU925kfnzjCev0ciny7QMkPqMAFRtzCUYo5tdS\""
+ );
+ assert_eq!(ctxs[0].nc, 1);
+ assert_eq!(
+ &mut ctxs[1]
+ .respond_with_testing_cnonce(
+ &params,
+ "f2/wE4q74E6zIJEtWaHKaf5wv/H5QzzpXusqGemxURZJ"
+ )
+ .unwrap(),
+ "Digest username=\"Mufasa\", \
+ realm=\"http-auth@example.org\", \
+ uri=\"/dir/index.html\", \
+ nonce=\"7ypf/xlj9XXwfDPEoM4URrv/xwf94BcCAzFZH4GiTo0v\", \
+ algorithm=MD5, \
+ nc=00000001, \
+ cnonce=\"f2/wE4q74E6zIJEtWaHKaf5wv/H5QzzpXusqGemxURZJ\", \
+ qop=auth, \
+ response=\"8ca523f5e9506fed4657c9700eebdbec\", \
+ opaque=\"FQhe/qaU925kfnzjCev0ciny7QMkPqMAFRtzCUYo5tdS\""
+ );
+ assert_eq!(ctxs[1].nc, 1);
+ }
+
+ /// Tests a made-up example with `MD5-sess`. There's no example in the RFC,
+ /// and these values haven't been tested against any other implementation.
+ /// But having the test here ensures we don't accidentally change the
+ /// algorithm.
+ #[test]
+ fn md5_sess() {
+ let www_authenticate = "\
+ Digest \
+ realm=\"http-auth@example.org\", \
+ qop=\"auth, auth-int\", \
+ algorithm=MD5-sess, \
+ nonce=\"7ypf/xlj9XXwfDPEoM4URrv/xwf94BcCAzFZH4GiTo0v\", \
+ opaque=\"FQhe/qaU925kfnzjCev0ciny7QMkPqMAFRtzCUYo5tdS\"";
+ let challenges = dbg!(crate::parse_challenges(www_authenticate).unwrap());
+ assert_eq!(challenges.len(), 1);
+ let ctxs: Result<Vec<_>, _> = challenges.iter().map(DigestClient::try_from).collect();
+ let mut ctxs = dbg!(ctxs.unwrap());
+ assert_eq!(ctxs[0].realm(), "http-auth@example.org");
+ assert_eq!(ctxs[0].domain(), "");
+ assert_eq!(
+ ctxs[0].nonce(),
+ "7ypf/xlj9XXwfDPEoM4URrv/xwf94BcCAzFZH4GiTo0v"
+ );
+ assert_eq!(
+ ctxs[0].opaque(),
+ Some("FQhe/qaU925kfnzjCev0ciny7QMkPqMAFRtzCUYo5tdS")
+ );
+ assert_eq!(ctxs[0].stale(), false);
+ assert_eq!(ctxs[0].algorithm(), Algorithm::Md5);
+ assert_eq!(ctxs[0].session(), true);
+ assert_eq!(ctxs[0].qop().0, (Qop::Auth as u8) | (Qop::AuthInt as u8));
+ assert_eq!(ctxs[0].nonce_count(), 0);
+ let params = crate::PasswordParams {
+ username: "Mufasa",
+ password: "Circle of Life",
+ uri: "/dir/index.html",
+ body: None,
+ method: "GET",
+ };
+ assert_eq!(
+ &mut ctxs[0]
+ .respond_with_testing_cnonce(
+ &params,
+ "f2/wE4q74E6zIJEtWaHKaf5wv/H5QzzpXusqGemxURZJ"
+ )
+ .unwrap(),
+ "Digest username=\"Mufasa\", \
+ realm=\"http-auth@example.org\", \
+ uri=\"/dir/index.html\", \
+ nonce=\"7ypf/xlj9XXwfDPEoM4URrv/xwf94BcCAzFZH4GiTo0v\", \
+ algorithm=MD5-sess, \
+ nc=00000001, \
+ cnonce=\"f2/wE4q74E6zIJEtWaHKaf5wv/H5QzzpXusqGemxURZJ\", \
+ qop=auth, \
+ response=\"e783283f46242139c486a698fec7211d\", \
+ opaque=\"FQhe/qaU925kfnzjCev0ciny7QMkPqMAFRtzCUYo5tdS\""
+ );
+ assert_eq!(ctxs[0].nc, 1);
+ }
+
+ /// Tests the example from [RFC 7616 section 3.9.2: SHA-512-256, Charset, and
+ /// Userhash](https://datatracker.ietf.org/doc/html/rfc7616#section-3.9.2).
+ #[test]
+ fn sha512_256_charset() {
+ let www_authenticate = "\
+ Digest \
+ realm=\"api@example.org\", \
+ qop=\"auth\", \
+ algorithm=SHA-512-256, \
+ nonce=\"5TsQWLVdgBdmrQ0XsxbDODV+57QdFR34I9HAbC/RVvkK\", \
+ opaque=\"HRPCssKJSGjCrkzDg8OhwpzCiGPChXYjwrI2QmXDnsOS\", \
+ charset=UTF-8, \
+ userhash=true";
+ let challenges = dbg!(crate::parse_challenges(www_authenticate).unwrap());
+ assert_eq!(challenges.len(), 1);
+ let ctxs: Result<Vec<_>, _> = challenges.iter().map(DigestClient::try_from).collect();
+ let mut ctxs = dbg!(ctxs.unwrap());
+ assert_eq!(ctxs.len(), 1);
+ assert_eq!(ctxs[0].realm(), "api@example.org");
+ assert_eq!(ctxs[0].domain(), "");
+ assert_eq!(
+ ctxs[0].nonce(),
+ "5TsQWLVdgBdmrQ0XsxbDODV+57QdFR34I9HAbC/RVvkK"
+ );
+ assert_eq!(
+ ctxs[0].opaque(),
+ Some("HRPCssKJSGjCrkzDg8OhwpzCiGPChXYjwrI2QmXDnsOS")
+ );
+ assert_eq!(ctxs[0].stale, false);
+ assert_eq!(ctxs[0].userhash, true);
+ assert_eq!(ctxs[0].algorithm, Algorithm::Sha512Trunc256);
+ assert_eq!(ctxs[0].qop.0, Qop::Auth as u8);
+ assert_eq!(ctxs[0].nc, 0);
+ let params = crate::PasswordParams {
+ username: "J\u{E4}s\u{F8}n Doe",
+ password: "Secret, or not?",
+ uri: "/doe.json",
+ body: None,
+ method: "GET",
+ };
+
+ // Note the username and response values in the RFC are *wrong*!
+ // https://www.rfc-editor.org/errata/eid4897
+ assert_eq!(
+ &mut ctxs[0]
+ .respond_with_testing_cnonce(
+ &params,
+ "NTg6RKcb9boFIAS3KrFK9BGeh+iDa/sm6jUMp2wds69v"
+ )
+ .unwrap(),
+ "\
+ Digest \
+ username=\"793263caabb707a56211940d90411ea4a575adeccb7e360aeb624ed06ece9b0b\", \
+ userhash=true, \
+ realm=\"api@example.org\", \
+ uri=\"/doe.json\", \
+ nonce=\"5TsQWLVdgBdmrQ0XsxbDODV+57QdFR34I9HAbC/RVvkK\", \
+ algorithm=SHA-512-256, \
+ nc=00000001, \
+ cnonce=\"NTg6RKcb9boFIAS3KrFK9BGeh+iDa/sm6jUMp2wds69v\", \
+ qop=auth, \
+ response=\"3798d4131c277846293534c3edc11bd8a5e4cdcbff78b05db9d95eeb1cec68a5\", \
+ opaque=\"HRPCssKJSGjCrkzDg8OhwpzCiGPChXYjwrI2QmXDnsOS\""
+ );
+ assert_eq!(ctxs[0].nc, 1);
+ ctxs[0].userhash = false;
+ ctxs[0].nc = 0;
+ assert_eq!(
+ &mut ctxs[0]
+ .respond_with_testing_cnonce(
+ &params,
+ "NTg6RKcb9boFIAS3KrFK9BGeh+iDa/sm6jUMp2wds69v"
+ )
+ .unwrap(),
+ "\
+ Digest \
+ username*=UTF-8''J%C3%A4s%C3%B8n%20Doe, \
+ realm=\"api@example.org\", \
+ uri=\"/doe.json\", \
+ nonce=\"5TsQWLVdgBdmrQ0XsxbDODV+57QdFR34I9HAbC/RVvkK\", \
+ algorithm=SHA-512-256, \
+ nc=00000001, \
+ cnonce=\"NTg6RKcb9boFIAS3KrFK9BGeh+iDa/sm6jUMp2wds69v\", \
+ qop=auth, \
+ response=\"3798d4131c277846293534c3edc11bd8a5e4cdcbff78b05db9d95eeb1cec68a5\", \
+ opaque=\"HRPCssKJSGjCrkzDg8OhwpzCiGPChXYjwrI2QmXDnsOS\""
+ );
+ assert_eq!(ctxs[0].nc, 1);
+ }
+
+ #[test]
+ fn rfc2069() {
+ // https://datatracker.ietf.org/doc/html/rfc2069#section-2.4
+ // The response there is wrong! See https://www.rfc-editor.org/errata/eid749
+ let www_authenticate = "\
+ Digest \
+ realm=\"testrealm@host.com\", \
+ nonce=\"dcd98b7102dd2f0e8b11d0f600bfb0c093\", \
+ opaque=\"5ccc069c403ebaf9f0171e9517f40e41\"";
+ let challenges = dbg!(crate::parse_challenges(www_authenticate).unwrap());
+ assert_eq!(challenges.len(), 1);
+ let ctxs: Result<Vec<_>, _> = challenges.iter().map(DigestClient::try_from).collect();
+ let mut ctxs = dbg!(ctxs.unwrap());
+ assert_eq!(ctxs.len(), 1);
+ assert_eq!(ctxs[0].qop.0, Qop::Auth as u8);
+ assert_eq!(ctxs[0].rfc2069_compat, true);
+ let params = crate::PasswordParams {
+ username: "Mufasa",
+ password: "CircleOfLife",
+ uri: "/dir/index.html",
+ body: None,
+ method: "GET",
+ };
+ assert_eq!(
+ &mut ctxs[0]
+ .respond_with_testing_cnonce(&params, "unused")
+ .unwrap(),
+ "\
+ Digest \
+ username=\"Mufasa\", \
+ realm=\"testrealm@host.com\", \
+ uri=\"/dir/index.html\", \
+ nonce=\"dcd98b7102dd2f0e8b11d0f600bfb0c093\", \
+ response=\"1949323746fe6a43ef61f9606e7febea\", \
+ opaque=\"5ccc069c403ebaf9f0171e9517f40e41\"",
+ );
+ assert_eq!(ctxs[0].nc, 1);
+ }
+
+ // See sizes with: cargo test -- --nocapture digest::tests::size
+ #[test]
+ fn size() {
+ // This type should have a niche.
+ assert_eq!(
+ dbg!(std::mem::size_of::<DigestClient>()),
+ dbg!(std::mem::size_of::<Option<DigestClient>>()),
+ )
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2025-02-22 06:24:07 +0000