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--55de8f7fd7by Demi Marie Obenour <demi@invisiblethingslab.com>: Simple libidn2 wrapper This adds a simple libidn2 wrapper, including unit tests via GTest. COPYBARA_INTEGRATE_REVIEW=https://github.com/google/sandboxed-api/pull/96 from DemiMarie:libidn255de8f7fd7PiperOrigin-RevId: 426121420 Change-Id: I79b23560ba23c0c2f1da063bfaa85eac13b2f517
91 lines
3.3 KiB
C++
91 lines
3.3 KiB
C++
// Copyright 2022 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "libidn2_sapi.h" // NOLINT(build/include)
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#include <gflags/gflags.h>
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#include <cstdlib>
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#include <fstream>
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#include <iostream>
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#include <glog/logging.h>
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#include "sandboxed_api/util/fileops.h"
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static constexpr std::size_t kMaxDomainNameLength = 256;
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static constexpr int kMinPossibleKnownError = -10000;
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absl::StatusOr<std::string> IDN2Lib::ProcessErrors(
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const absl::StatusOr<int>& untrusted_res, sapi::v::GenericPtr& ptr) {
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SAPI_RETURN_IF_ERROR(untrusted_res.status());
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int res = untrusted_res.value();
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if (res < 0) {
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if (res == IDN2_MALLOC) {
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return absl::ResourceExhaustedError("malloc() failed in libidn2");
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}
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if (res > kMinPossibleKnownError) {
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return absl::InvalidArgumentError(idn2_strerror(res));
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}
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return absl::InvalidArgumentError("Unexpected error");
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}
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::sapi::v::RemotePtr p(reinterpret_cast<void*>(ptr.GetValue()));
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auto maybe_untrusted_name = sandbox_->GetCString(p, kMaxDomainNameLength);
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SAPI_RETURN_IF_ERROR(sandbox_->Free(&p));
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if (!maybe_untrusted_name.ok()) {
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return maybe_untrusted_name.status();
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}
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// FIXME: sanitize the result by checking that the return value is
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// valid ASCII (for a-labels) or UTF-8 (for u-labels) and doesn't
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// contain potentially malicious characters.
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return *maybe_untrusted_name;
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}
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absl::StatusOr<std::string> IDN2Lib::idn2_register_u8(const char* ulabel,
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const char* alabel) {
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::std::optional<::sapi::v::ConstCStr> alabel_ptr, ulabel_ptr;
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if (ulabel) ulabel_ptr.emplace(ulabel);
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if (alabel) alabel_ptr.emplace(alabel);
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::sapi::v::GenericPtr ptr;
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::sapi::v::NullPtr null_ptr;
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const auto untrusted_res = api_.idn2_register_u8(
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ulabel ? ulabel_ptr->PtrBefore() : &null_ptr,
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alabel ? alabel_ptr->PtrBefore() : &null_ptr, ptr.PtrAfter(),
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IDN2_NFC_INPUT | IDN2_NONTRANSITIONAL);
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return this->ProcessErrors(untrusted_res, ptr);
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}
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absl::StatusOr<std::string> IDN2Lib::SapiGeneric(
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const char* data,
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absl::StatusOr<int> (IDN2Api::*cb)(sapi::v::Ptr* input,
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sapi::v::Ptr* output, int flags)) {
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::sapi::v::ConstCStr src(data);
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::sapi::v::GenericPtr ptr;
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absl::StatusOr<int> untrusted_res = ((api_).*(cb))(
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src.PtrBefore(), ptr.PtrAfter(), IDN2_NFC_INPUT | IDN2_NONTRANSITIONAL);
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return this->ProcessErrors(untrusted_res, ptr);
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}
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absl::StatusOr<std::string> IDN2Lib::idn2_to_unicode_8z8z(const char* data) {
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return IDN2Lib::SapiGeneric(data, &IDN2Api::idn2_to_unicode_8z8z);
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}
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absl::StatusOr<std::string> IDN2Lib::idn2_to_ascii_8z(const char* data) {
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return IDN2Lib::SapiGeneric(data, &IDN2Api::idn2_to_ascii_8z);
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}
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absl::StatusOr<std::string> IDN2Lib::idn2_lookup_u8(const char* data) {
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return IDN2Lib::SapiGeneric(data, &IDN2Api::idn2_lookup_u8);
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}
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