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exile.h
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policy: Add disable_syscall_filter policy. Add defaults only on enable. 

Only add default syscall policy when disable_syscall_filter is 0 (default)
and no user-custom policy has been added.
This commit is contained in:
Albert S. 2021-08-15 18:31:13 +02:00
parent 9192ec3aa4
commit f6af1bb78f
1 changed files with 30 additions and 9 deletions
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39
qssb.h
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@ -227,6 +227,7 @@ struct qssb_policy
int no_fs;
int no_new_fds;
int namespace_options;
int disable_syscall_filter;
/* Bind mounts all paths in path_policies into the chroot and applies
non-landlock policies */
int mount_path_policies_to_chroot;
@ -320,6 +321,7 @@ int qssb_append_syscalls_policy(struct qssb_policy *qssb_policy, unsigned int sy
*(qssb_policy->syscall_policies_tail) = newpolicy;
qssb_policy->syscall_policies_tail = &(newpolicy->next);
qssb_policy->disable_syscall_filter = 0;
return 0;
}
@ -345,6 +347,7 @@ struct qssb_policy *qssb_init_policy()
result->no_fs = 0;
result->no_new_fds = 0;
result->namespace_options = QSSB_UNSHARE_MOUNT | QSSB_UNSHARE_USER;
result->disable_syscall_filter = 0;
result->chdir_path = NULL;
result->mount_path_policies_to_chroot = 0;
result->chroot_target_path[0] = '\0';
@ -354,15 +357,6 @@ struct qssb_policy *qssb_init_policy()
result->syscall_policies = NULL;
result->syscall_policies_tail = &(result->syscall_policies);
size_t blacklisted_syscalls_count = sizeof(default_blacklisted_syscalls)/sizeof(default_blacklisted_syscalls[0]);
int appendresult = qssb_append_syscalls_policy(result, QSSB_SYSCALL_DENY_KILL_PROCESS, default_blacklisted_syscalls, blacklisted_syscalls_count);
if(appendresult != 0)
{
return NULL;
}
return result;
}
@ -989,6 +983,23 @@ static int enable_no_fs(struct qssb_policy *policy)
return 0;
}
static int qssb_append_default_syscall_policy(struct qssb_policy *policy)
{
size_t blacklisted_syscalls_count = sizeof(default_blacklisted_syscalls)/sizeof(default_blacklisted_syscalls[0]);
int appendresult = qssb_append_syscalls_policy(policy, QSSB_SYSCALL_DENY_KILL_PROCESS, default_blacklisted_syscalls, blacklisted_syscalls_count);
if(appendresult != 0)
{
return 1;
}
appendresult = qssb_append_syscall_default_policy(policy, QSSB_SYSCALL_ALLOW);
if(appendresult != 0)
{
return 1;
}
return 0;
}
/* Enables the specified qssb_policy.
*
* This function is not atomic (and can't be). This means some
@ -1136,10 +1147,20 @@ int qssb_enable_policy(struct qssb_policy *policy)
close(landlock_ruleset_fd);
#endif
if(policy->syscall_policies == NULL && policy->disable_syscall_filter == 0)
{
if(qssb_append_default_syscall_policy(policy) != 0)
{
QSSB_LOG_ERROR("Failed to add default syscall policy\n");
return -1;
}
}
if(policy->syscall_policies != NULL)
{
return qssb_enable_syscall_policy(policy);
}
return 0;
}
#endif