Hello Friends,
I am currently working on SELinux and as a part of it, I need to make some changes to it. Basically, I would like to allow all access requests, but not by enabling permissive mode. I checked the code from SELinux/ss/services.c. The 2 main functions that can be helpful are security_compute_av() and context_struct_compute_av(). The 1st call has the parameters that I need to make other things work like the ssid, tsid, etc. But how to allow all access request. I am posting some code for handy reference. Thank you for your time. /**
* security_compute_av - Compute access vector decisions.
* @ssid: source security identifier
* @tsid: target security identifier
* @tclass: target security class
* @requested: requested permissions
* @avd: access vector decisions
*
* Compute a set of access vector decisions based on the
* SID pair (@ssid, @tsid) for the permissions in @tclass.
* Return -%EINVAL if any of the parameters are invalid or %0
* if the access vector decisions were computed successfully.
*/
int security_compute_av(u32 ssid,
u32 tsid,
u16 tclass,
u32 requested,
struct av_decision *avd)
{
struct context *scontext = NULL, *tcontext = NULL;
int rc = 0;
if (!ss_initialized) {
avd->allowed = 0xffffffff;
avd->auditallow = 0;
avd->auditdeny = 0xffffffff;
avd->seqno = latest_granting;
return 0;
}
read_lock(&policy_rwlock);
scontext = sidtab_search(&sidtab, ssid);
if (!scontext) {
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
__func__, ssid);
rc = -EINVAL;
goto out;
}
tcontext = sidtab_search(&sidtab, tsid);
if (!tcontext) {
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
__func__, tsid);
rc = -EINVAL;
goto out;
}
rc = context_struct_compute_av(scontext, tcontext, tclass,
requested, avd);
/* permissive domain? */
if (ebitmap_get_bit(&policydb.permissive_map, scontext->type))
avd->flags |= AVD_FLAGS_PERMISSIVE;
out:
read_unlock(&policy_rwlock);
return rc;
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