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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "peer_policies.h"
#include <vespa/vespalib/regex/regex.h>
#include <iostream>
namespace vespalib::net::tls {
namespace {
bool
is_regex_special_char(char c) noexcept {
switch (c) {
case '^':
case '$':
case '|':
case '{':
case '}':
case '(':
case ')':
case '[':
case ']':
case '\\':
case '+':
case '.':
case '?':
case '*':
return true;
default:
return false;
}
}
// Important: `delimiter` MUST NOT be a character that needs escaping within a regex [charset]
template <bool SupportSingleCharMatch>
std::string
char_delimited_glob_to_regex(vespalib::stringref glob, char delimiter) {
std::string ret = "^";
ret.reserve(glob.size() + 2);
// Note: we explicitly stop matching at a delimiter boundary.
// This is to make path fragment matching less vulnerable to dirty tricks.
const std::string wildcard_pattern = std::string("[^") + delimiter + "]*";
// Same applies for single chars; they should only match _within_ a delimited boundary.
const std::string single_char_pattern = std::string("[^") + delimiter + "]";
for (auto c : glob) {
if (c == '*') {
ret += wildcard_pattern;
} else if (c == '?' && SupportSingleCharMatch) {
ret += single_char_pattern;
} else {
if (is_regex_special_char(c)) {
ret += '\\';
}
ret += c;
}
}
ret += '$';
return ret;
}
class RegexHostMatchPattern : public CredentialMatchPattern {
Regex _pattern_as_regex;
explicit RegexHostMatchPattern(std::string_view glob_pattern)
: _pattern_as_regex(Regex::from_pattern(glob_pattern))
{
}
public:
RegexHostMatchPattern(RegexHostMatchPattern&&) noexcept = default;
~RegexHostMatchPattern() override = default;
RegexHostMatchPattern& operator=(RegexHostMatchPattern&&) noexcept = default;
[[nodiscard]] static RegexHostMatchPattern from_dns_glob_pattern(vespalib::stringref glob_pattern) {
return RegexHostMatchPattern(char_delimited_glob_to_regex<true>(glob_pattern, '.'));
}
[[nodiscard]] static RegexHostMatchPattern from_uri_glob_pattern(vespalib::stringref glob_pattern) {
return RegexHostMatchPattern(char_delimited_glob_to_regex<false>(glob_pattern, '/'));
}
[[nodiscard]] bool matches(vespalib::stringref str) const noexcept override {
return _pattern_as_regex.full_match(std::string_view(str.data(), str.size()));
}
};
class ExactMatchPattern : public CredentialMatchPattern {
vespalib::string _must_match_exactly;
public:
explicit ExactMatchPattern(vespalib::stringref str_to_match) noexcept // vespalib::string ctors marked noexcept
: _must_match_exactly(str_to_match)
{
}
~ExactMatchPattern() override = default;
[[nodiscard]] bool matches(vespalib::stringref str) const noexcept override {
return (str == _must_match_exactly);
}
};
} // anon ns
std::shared_ptr<const CredentialMatchPattern>
CredentialMatchPattern::create_from_dns_glob(vespalib::stringref glob_pattern) {
return std::make_shared<const RegexHostMatchPattern>(RegexHostMatchPattern::from_dns_glob_pattern(glob_pattern));
}
std::shared_ptr<const CredentialMatchPattern>
CredentialMatchPattern::create_from_uri_glob(vespalib::stringref glob_pattern) {
return std::make_shared<const RegexHostMatchPattern>(RegexHostMatchPattern::from_uri_glob_pattern(glob_pattern));
}
std::shared_ptr<const CredentialMatchPattern>
CredentialMatchPattern::create_exact_match(vespalib::stringref str) {
return std::make_shared<const ExactMatchPattern>(str);
}
RequiredPeerCredential::RequiredPeerCredential(Field field, vespalib::string must_match_pattern)
: _field(field),
_original_pattern(std::move(must_match_pattern)),
_match_pattern(field == Field::SAN_URI ? CredentialMatchPattern::create_from_uri_glob(_original_pattern)
: CredentialMatchPattern::create_from_dns_glob(_original_pattern))
{
}
RequiredPeerCredential::RequiredPeerCredential(const RequiredPeerCredential &) noexcept = default;
RequiredPeerCredential::RequiredPeerCredential(RequiredPeerCredential &&) noexcept = default;
RequiredPeerCredential & RequiredPeerCredential::operator=(RequiredPeerCredential &&) noexcept = default;
RequiredPeerCredential::~RequiredPeerCredential() = default;
PeerPolicy::PeerPolicy() = default;
PeerPolicy::PeerPolicy(std::vector<RequiredPeerCredential> required_peer_credentials)
: _required_peer_credentials(std::move(required_peer_credentials)),
_granted_capabilities(CapabilitySet::make_with_all_capabilities())
{
}
PeerPolicy::PeerPolicy(std::vector<RequiredPeerCredential> required_peer_credentials,
CapabilitySet granted_capabilities)
: _required_peer_credentials(std::move(required_peer_credentials)),
_granted_capabilities(granted_capabilities)
{}
PeerPolicy::~PeerPolicy() = default;
AuthorizedPeers::AuthorizedPeers(const AuthorizedPeers&) = default;
AuthorizedPeers::AuthorizedPeers(AuthorizedPeers&&) noexcept = default;
AuthorizedPeers& AuthorizedPeers::operator=(AuthorizedPeers&&) noexcept = default;
AuthorizedPeers::~AuthorizedPeers() = default;
namespace {
template <typename Collection>
void
print_joined(std::ostream& os, const Collection& coll, const char* sep) {
bool first = true;
for (const auto& e : coll) {
if (!first) {
os << sep;
}
first = false;
os << e;
}
}
constexpr const char*
to_string(RequiredPeerCredential::Field field) noexcept {
switch (field) {
case RequiredPeerCredential::Field::CN: return "CN";
case RequiredPeerCredential::Field::SAN_DNS: return "SAN_DNS";
case RequiredPeerCredential::Field::SAN_URI: return "SAN_URI";
}
abort();
}
}
std::ostream&
operator<<(std::ostream& os, const RequiredPeerCredential& cred) {
os << "RequiredPeerCredential("
<< to_string(cred.field())
<< " matches '"
<< cred.original_pattern()
<< "')";
return os;
}
std::ostream&
operator<<(std::ostream& os, const PeerPolicy& policy) {
os << "PeerPolicy(";
print_joined(os, policy.required_peer_credentials(), ", ");
os << ", " << policy.granted_capabilities().to_string() << ")";
return os;
}
std::ostream&
operator<<(std::ostream& os, const AuthorizedPeers& authorized){
os << "AuthorizedPeers(";
print_joined(os, authorized.peer_policies(), ", ");
os << ")";
return os;
}
} // vespalib::net::tls
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