mirror of
https://github.com/google/sandboxed-api.git
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78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
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// Copyright 2020 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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// http://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 "sandboxed_api/sandbox2/fork_client.h"
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#include "sandboxed_api/sandbox2/comms.h"
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#include "sandboxed_api/sandbox2/forkserver.pb.h"
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#include "sandboxed_api/util/raw_logging.h"
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namespace sandbox2 {
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const char kForkServerDisableEnv[] = "SANDBOX2_NOFORKSERVER";
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pid_t ForkClient::SendRequest(const ForkRequest& request, int exec_fd,
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int comms_fd, int user_ns_fd, pid_t* init_pid) {
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// Acquire the channel ownership for this request (transaction).
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absl::MutexLock l(&comms_mutex_);
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if (!comms_->SendProtoBuf(request)) {
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SAPI_RAW_LOG(ERROR, "Sending PB to the ForkServer failed");
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return -1;
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}
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SAPI_RAW_CHECK(comms_fd != -1, "comms_fd was not properly set up");
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if (!comms_->SendFD(comms_fd)) {
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SAPI_RAW_LOG(ERROR, "Sending Comms FD (%d) to the ForkServer failed",
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comms_fd);
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return -1;
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}
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if (request.mode() == FORKSERVER_FORK_EXECVE ||
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request.mode() == FORKSERVER_FORK_EXECVE_SANDBOX) {
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SAPI_RAW_CHECK(exec_fd != -1, "exec_fd cannot be -1 in execve mode");
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if (!comms_->SendFD(exec_fd)) {
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SAPI_RAW_LOG(ERROR, "Sending Exec FD (%d) to the ForkServer failed",
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exec_fd);
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return -1;
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}
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}
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if (request.mode() == FORKSERVER_FORK_JOIN_SANDBOX_UNWIND) {
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SAPI_RAW_CHECK(user_ns_fd != -1, "user_ns_fd cannot be -1 in unwind mode");
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if (!comms_->SendFD(user_ns_fd)) {
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SAPI_RAW_LOG(ERROR, "Sending user ns FD (%d) to the ForkServer failed",
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user_ns_fd);
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return -1;
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}
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}
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int32_t pid;
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// Receive init process ID.
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if (!comms_->RecvInt32(&pid)) {
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SAPI_RAW_LOG(ERROR, "Receiving init PID from the ForkServer failed");
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return -1;
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}
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if (init_pid) {
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*init_pid = static_cast<pid_t>(pid);
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}
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// Receive sandboxee process ID.
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if (!comms_->RecvInt32(&pid)) {
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SAPI_RAW_LOG(ERROR, "Receiving sandboxee PID from the ForkServer failed");
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return -1;
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}
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return static_cast<pid_t>(pid);
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}
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} // namespace sandbox2
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