91 lines
2.5 KiB
C++
91 lines
2.5 KiB
C++
#include <vector>
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#include <initializer_list>
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#include <string.h>
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#include <sched.h>
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#include <unistd.h>
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#include <fstream>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <filesystem>
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#include <sys/mount.h>
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#include <sys/capability.h>
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#define HAVE_LANDLOCK 0
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#include <exile.h>
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#include "../logger.h"
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#include "../utils.h"
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#include "../random.h"
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#include "sandbox-linux.h"
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/* TODO: make a whitelist approach. So far we simply blacklist
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* obvious systemcalls. To whitelist, we need to analyse our
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* dependencies (http library, sqlite wrapper, sqlite lib etc.) */
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bool SandboxLinux::supported()
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{
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std::fstream stream;
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stream.open("/proc/sys/kernel/unprivileged_userns_clone");
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if(stream.is_open())
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{
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std::string str;
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stream >> str;
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if(str[0] == '0')
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{
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Logger::error() << "Please write '1' to /proc/sys/kernel/unprivileged_userns_clone in order to enable "
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"sandboxing support on this system";
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return false;
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}
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}
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return true;
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}
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bool SandboxLinux::enable(std::vector<std::string> fsPaths)
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{
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std::sort(fsPaths.begin(), fsPaths.end(),
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[](const std::string &a, const std::string &b) { return a.length() < b.length(); });
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struct exile_policy *policy = exile_init_policy();
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if(policy == NULL)
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{
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Logger::error() << "Failed to init sandboxing policy (worker) ";
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return false;
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}
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for(unsigned int i = 0; i < fsPaths.size(); i++)
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{
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exile_append_path_policy(policy, EXILE_FS_ALLOW_READ | EXILE_FS_ALLOW_WRITE, fsPaths[i].c_str());
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}
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policy->drop_caps = 1;
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policy->not_dumpable = 1;
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policy->no_new_privs = 1;
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policy->mount_path_policies_to_chroot = 1;
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if(exile_append_group_syscall_policy(policy, EXILE_SYSCALL_ALLOW, EXILE_SYSCGROUP_DEFAULT_ALLOW) != 0)
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{
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Logger::error() << "Sandbox: Failed to add whitelist!";
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exile_free_policy(policy);
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return false;
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}
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if(exile_append_group_syscall_policy(policy, EXILE_SYSCALL_ALLOW, EXILE_SYSCGROUP_SOCKET | EXILE_SYSCGROUP_FUTEX | EXILE_SYSCGROUP_PATH | EXILE_SYSCGROUP_SCHED | EXILE_SYSCGROUP_TIME) != 0)
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{
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Logger::error() << "Sandbox: Failed to add socket group!";
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exile_free_policy(policy);
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return false;
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}
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if(exile_append_syscall_default_policy(policy, EXILE_SYSCALL_DENY_KILL_PROCESS) != 0)
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{
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Logger::error() << "Sandbox: Default policy";
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exile_free_policy(policy);
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return false;
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}
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if(exile_enable_policy(policy) != 0)
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{
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Logger::error() << "Sandbox: Activation of seccomp blacklist failed!";
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exile_free_policy(policy);
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return false;
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}
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exile_free_policy(policy);
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return true;
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}
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