mirror of
https://github.com/google/sandboxed-api.git
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119 lines
2.9 KiB
C++
119 lines
2.9 KiB
C++
// This file is an example of a network sandboxed binary inside a network
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// namespace. It can't connect with the server directly, but the executor can
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// establish a connection and pass the connected socket to the sandboxee.
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <syscall.h>
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#include <cstring>
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#include "absl/strings/str_format.h"
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#include "sandboxed_api/sandbox2/client.h"
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#include "sandboxed_api/sandbox2/comms.h"
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#include "sandboxed_api/sandbox2/network_proxy/client.h"
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#include "sandboxed_api/sandbox2/util/fileops.h"
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static ssize_t ReadFromFd(int fd, uint8_t* buf, size_t size) {
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ssize_t received = 0;
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while (received < size) {
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ssize_t read_status =
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TEMP_FAILURE_RETRY(read(fd, &buf[received], size - received));
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if (read_status == 0) {
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break;
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}
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if (read_status < 0) {
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return -1;
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}
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received += read_status;
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}
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return received;
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}
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static bool CommunicationTest(int sock) {
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char received[1025] = {0};
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if (ReadFromFd(sock, reinterpret_cast<uint8_t*>(received),
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sizeof(received) - 1) <= 0) {
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LOG(ERROR) << "Data receiving error";
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return false;
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}
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absl::PrintF("Sandboxee received data from the server:\n\n%s\n", received);
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if (strcmp(received, "Hello World\n")) {
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LOG(ERROR) << "Data receiving error";
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return false;
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}
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return true;
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}
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static int ConnectToServer(int port) {
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int s = socket(AF_INET6, SOCK_STREAM, 0);
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if (s < 0) {
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PLOG(ERROR) << "socket() failed";
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return -1;
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}
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struct sockaddr_in6 saddr {};
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saddr.sin6_family = AF_INET6;
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saddr.sin6_port = htons(port);
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int err = inet_pton(AF_INET6, "::1", &saddr.sin6_addr);
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if (err == 0) {
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LOG(ERROR) << "inet_pton() failed";
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close(s);
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return -1;
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} else if (err == -1) {
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PLOG(ERROR) << "inet_pton() failed";
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close(s);
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return -1;
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}
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err = connect(s, reinterpret_cast<const struct sockaddr*>(&saddr),
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sizeof(saddr));
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if (err != 0) {
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LOG(ERROR) << "connect() failed";
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close(s);
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return -1;
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}
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LOG(INFO) << "Connected to the server";
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return s;
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}
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int main(int argc, char** argv) {
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// Set-up the sandbox2::Client object, using a file descriptor (1023).
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sandbox2::Comms comms(sandbox2::Comms::kSandbox2ClientCommsFD);
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sandbox2::Client sandbox2_client(&comms);
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// Enable sandboxing from here.
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sandbox2_client.SandboxMeHere();
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sapi::Status status = sandbox2_client.InstallNetworkProxyHandler();
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if (!status.ok()) {
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LOG(ERROR) << "InstallNetworkProxyHandler() failed: " << status.message();
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return 1;
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}
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// Receive port number of the server
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int port;
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if (!comms.RecvInt32(&port)) {
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LOG(ERROR) << "sandboxee_comms->RecvUint32(&crc4) failed";
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return 2;
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}
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sandbox2::file_util::fileops::FDCloser client{ConnectToServer(port)};
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if (client.get() == -1) {
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return 3;
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}
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if (!CommunicationTest(client.get())) {
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return 4;
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}
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return 0;
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}
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