sandbox: adjust to latest qssb.h

Este commit está contenido en:
Albert S. 2021-09-23 12:44:35 +02:00
padre f26fd19fb4
commit 67eb8b6428

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@ -26,16 +26,26 @@
bool SandboxLinux::enableForInit()
{
umask(0027);
struct qssb_policy policy = {0};
int blacklisted_syscalls[] = {QSSB_SYS(execveat), QSSB_SYS(execve), -1};
policy.blacklisted_syscalls = blacklisted_syscalls;
policy.no_new_privs = 1;
int result = qssb_enable_policy(&policy);
if(result != 0)
struct qssb_policy *policy = qssb_init_policy();
if(policy == NULL)
{
Logger::error() << "Failed to install sandboxing policy (init): " << result;
Logger::error() << "Failed to init sandboxing policy (init)";
return false;
}
policy->namespace_options = QSSB_UNSHARE_USER;
policy->drop_caps = 0;
qssb_append_syscall_policy(policy, QSSB_SYSCALL_DENY_KILL_PROCESS, QSSB_SYS(execveat));
qssb_append_syscall_policy(policy, QSSB_SYSCALL_DENY_KILL_PROCESS, QSSB_SYS(execve));
qssb_append_syscall_default_policy(policy, QSSB_SYSCALL_ALLOW);
int result = qssb_enable_policy(policy);
if(result != 0)
{
Logger::error() << "Failed to enable sandboxing policy (init): " << result;
qssb_free_policy(policy);
return false;
}
qssb_free_policy(policy);
return true;
}
@ -44,28 +54,34 @@ bool SandboxLinux::enablePreWorker(std::vector<std::string> fsPaths)
std::sort(fsPaths.begin(), fsPaths.end(),
[](const std::string &a, const std::string &b) { return a.length() < b.length(); });
struct qssb_path_policy *policies = new qssb_path_policy[fsPaths.size()];
struct qssb_policy *policy = qssb_init_policy();
if(policy == NULL)
{
Logger::error() << "Failed to init sandboxing policy (pre)";
return false;
}
for(unsigned int i = 0; i < fsPaths.size(); i++)
{
policies[i].next = policies + (i + 1);
policies[i].mountpoint = fsPaths[i].c_str();
policies[i].policy = QSSB_MOUNT_ALLOW_READ | QSSB_MOUNT_ALLOW_WRITE;
qssb_append_path_policy(policy, QSSB_FS_ALLOW_READ | QSSB_FS_ALLOW_WRITE, fsPaths[i].c_str());
}
policies[fsPaths.size() - 1].next = NULL;
struct qssb_policy policy = {0};
policy.path_policies = policies;
policy.namespace_options |= QSSB_UNSHARE_MOUNT;
policy.namespace_options |= QSSB_UNSHARE_USER;
int blacklisted_syscalls[] = {QSSB_SYS(execveat), QSSB_SYS(execve), -1};
policy.blacklisted_syscalls = blacklisted_syscalls;
int result = qssb_enable_policy(&policy);
policy->namespace_options = QSSB_UNSHARE_MOUNT;
policy->drop_caps = 0;
policy->mount_path_policies_to_chroot = 1;
qssb_append_syscall_policy(policy, QSSB_SYSCALL_DENY_KILL_PROCESS, QSSB_SYS(execveat));
qssb_append_syscall_policy(policy, QSSB_SYSCALL_DENY_KILL_PROCESS, QSSB_SYS(execve));
qssb_append_syscall_default_policy(policy, QSSB_SYSCALL_ALLOW);
int result = qssb_enable_policy(policy);
if(result != 0)
{
Logger::error() << "Failed to install sandboxing policy (preworker): %i" << result;
qssb_free_policy(policy);
return false;
}
delete[] policies;
qssb_free_policy(policy);
return true;
}
@ -88,30 +104,35 @@ bool SandboxLinux::supported()
}
bool SandboxLinux::enableForWorker()
{
struct qssb_policy policy = {0};
policy.drop_caps = 1;
policy.not_dumpable = 1;
policy.no_new_privs = 1;
struct qssb_policy *policy = qssb_init_policy();
if(policy == NULL)
{
Logger::error() << "Failed to init sandboxing policy (worker) ";
return false;
}
policy->drop_caps = 1;
policy->not_dumpable = 1;
policy->no_new_privs = 1;
policy->namespace_options = 0;
/* TODO: as said, a whitelist approach is better. As such, this list is bound to be incomplete in the
* sense that more could be listed here and some critical ones are probably missing */
int blacklisted_syscalls[] = {QSSB_SYS(setuid),
QSSB_SYS(connect),
QSSB_SYS(chroot),
QSSB_SYS(pivot_root),
QSSB_SYS(mount),
QSSB_SYS(setns),
QSSB_SYS(unshare),
QSSB_SYS(ptrace),
QSSB_SYS(personality),
QSSB_SYS(prctl),
-1};
policy.blacklisted_syscalls = blacklisted_syscalls;
if(qssb_enable_policy(&policy) != 0)
/* TODO: use qssb groups */
long blacklisted_syscalls[] = {QSSB_SYS(setuid), QSSB_SYS(connect), QSSB_SYS(chroot), QSSB_SYS(pivot_root),
QSSB_SYS(mount), QSSB_SYS(setns), QSSB_SYS(unshare), QSSB_SYS(ptrace),
QSSB_SYS(personality), QSSB_SYS(prctl)};
qssb_append_syscalls_policy(policy, QSSB_SYSCALL_DENY_KILL_PROCESS, blacklisted_syscalls,
sizeof(blacklisted_syscalls) / sizeof(blacklisted_syscalls[0]));
qssb_append_syscall_default_policy(policy, QSSB_SYSCALL_ALLOW);
if(qssb_enable_policy(policy) != 0)
{
Logger::error() << "Sandbox: Activation of seccomp blacklist failed!";
qssb_free_policy(policy);
return false;
}
qssb_free_policy(policy);
return true;
}