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epee: fail digest auth cleanly when MD5 is unavailable

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This commit is contained in:
selsta
2026-05-04 19:34:40 +02:00
parent 8b79bfc836
commit 46c857ef27
1 changed files with 71 additions and 25 deletions
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contrib/epee/src/http_auth.cpp
+71 -25
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@@ -42,6 +42,7 @@
#include <boost/range/algorithm/find_if.hpp>
#include <boost/range/iterator_range_core.hpp>
#include <boost/range/join.hpp>
#include <boost/optional/optional.hpp>
#include <boost/spirit/include/karma_generate.hpp>
#include <boost/spirit/include/karma_uint.hpp>
#include <boost/spirit/include/qi_alternative.hpp>
@@ -112,40 +113,52 @@ namespace
struct update
{
template<typename T>
void operator()(const T& arg) const
bool operator()(const T& arg) const
{
const boost::iterator_range<const char*> data(boost::as_literal(arg));
EVP_DigestUpdate(
return EVP_DigestUpdate(
ctx,
reinterpret_cast<const std::uint8_t*>(data.begin()),
data.size()
);
) == 1;
}
void operator()(const std::string& arg) const
bool operator()(const std::string& arg) const
{
(*this)(boost::string_ref(arg));
return (*this)(boost::string_ref(arg));
}
void operator()(const epee::wipeable_string& arg) const
bool operator()(const epee::wipeable_string& arg) const
{
EVP_DigestUpdate(
return EVP_DigestUpdate(
ctx,
reinterpret_cast<const std::uint8_t*>(arg.data()),
arg.size()
);
) == 1;
}
EVP_MD_CTX *ctx;
};
template<typename... T>
std::array<char, 32> operator()(const T&... args) const
{
boost::optional<std::array<char, 32>> operator()(const T&... args) const
{
std::unique_ptr<EVP_MD_CTX, decltype(&EVP_MD_CTX_free)> ctx(EVP_MD_CTX_new(), &EVP_MD_CTX_free);
EVP_DigestInit(ctx.get(), EVP_md5());
boost::fusion::for_each(std::tie(args...), update{ctx.get()});
if (!ctx)
return boost::none;
if (EVP_DigestInit_ex(ctx.get(), EVP_md5(), nullptr) != 1)
return boost::none;
bool ok = true;
boost::fusion::for_each(std::tie(args...), [&] (const auto& arg) {
ok = ok && update{ctx.get()}(arg);
});
if (!ok)
return boost::none;
std::array<std::uint8_t, 16> digest{{}};
EVP_DigestFinal(ctx.get(), digest.data(), NULL);
if (EVP_DigestFinal_ex(ctx.get(), digest.data(), nullptr) != 1)
return boost::none;
return epee::to_hex::array(digest);
}
};
@@ -254,12 +267,21 @@ namespace
std::string operator()(const http::http_client_auth::session& user,
const boost::string_ref method, const boost::string_ref uri) const
{
const auto response = digest(
generate_a1(digest, user), u8":", user.server.nonce, u8":", digest(method, u8":", uri)
);
const auto a1 = generate_a1(digest, user);
if (!a1)
return {};
const auto a2 = digest(method, u8":", uri);
if (!a2)
return {};
const auto response = digest(*a1, u8":", user.server.nonce, u8":", *a2);
if (!response)
return {};
std::string out{};
out.reserve(client_reserve_size);
init_client_value(out, Digest::name, user, uri, response);
init_client_value(out, Digest::name, user, uri, *response);
return out;
}
private:
@@ -301,12 +323,24 @@ namespace
return {};
const std::string cnonce = epee::string_encoding::base64_encode(rbuf.data(), rbuf.size());
const auto a1 = generate_a1(digest, user);
if (!a1)
return {};
const auto a2 = digest(method, u8":", uri);
if (!a2)
return {};
const auto response = digest(
generate_a1(digest, user), u8":", user.server.nonce, u8":", nc, u8":", cnonce, u8":auth:", digest(method, u8":", uri)
*a1, u8":", user.server.nonce, u8":", nc, u8":", cnonce, u8":auth:", *a2
);
if (!response)
return {};
out.clear();
init_client_value(out, Digest::name, user, uri, response);
init_client_value(out, Digest::name, user, uri, *response);
add_field(out, u8"qop", ceref(u8"auth"));
add_field(out, u8"nc", nc);
add_field(out, u8"cnonce", quoted_(cnonce));
@@ -517,13 +551,13 @@ namespace
struct has_valid_response
{
template<typename Digest, typename Result>
Result generate_old_response(Digest digest, const Result& key, const Result& auth) const
boost::optional<Result> generate_old_response(Digest digest, const Result& key, const Result& auth) const
{
return digest(key, u8":", request.nonce, u8":", auth);
}
template<typename Digest, typename Result>
Result generate_new_response(Digest digest, const Result& key, const Result& auth) const
boost::optional<Result> generate_new_response(Digest digest, const Result& key, const Result& auth) const
{
return digest(
key, u8":", request.nonce, u8":", request.nc, u8":", request.cnonce, u8":", request.qop, u8":", auth
@@ -543,19 +577,27 @@ namespace
(request.algorithm.empty() && std::is_same<md5_, Digest>::value))
{
auto key = generate_a1(digest, user.credentials, auth_realm);
if (!key)
return false;
if (boost::ends_with(request.algorithm, sess_algo, ascii_iequal))
{
key = digest(key, u8":", request.nonce, u8":", request.cnonce);
key = digest(*key, u8":", request.nonce, u8":", request.cnonce);
if (!key)
return false;
}
auto auth = digest(method, u8":", request.uri);
if (!auth)
return false;
if (request.qop.empty())
{
return check(generate_old_response(std::move(digest), std::move(key), std::move(auth)));
const auto response = generate_old_response(std::move(digest), std::move(*key), std::move(*auth));
return response && check(*response);
}
else if (boost::equals(ceref(u8"auth"), request.qop, ascii_iequal))
{
return check(generate_new_response(std::move(digest), std::move(key), std::move(auth)));
const auto response = generate_new_response(std::move(digest), std::move(*key), std::move(*auth));
return response && check(*response);
}
}
return false;
@@ -777,7 +819,11 @@ namespace epee
if (user->server.generator)
{
++(user->counter);
return std::make_pair(std::string(client_auth_field), user->server.generator(*user, method, uri));
std::string auth = user->server.generator(*user, method, uri);
if (auth.empty())
return boost::none;
return std::make_pair(std::string(client_auth_field), std::move(auth));
}
return boost::none;
}