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/*-
* Copyright (c) 2025 Kyle Evans <kevans@FreeBSD.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <sys/cdefs.h>
#include "opt_mac.h"
#include <sys/param.h>
#include <sys/condvar.h>
#include <sys/imgact.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/mac.h>
#include <sys/proc.h>
#include <sys/sbuf.h>
#include <sys/sdt.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/file.h>
#include <sys/namei.h>
#include <sys/sysctl.h>
#include <security/mac/mac_framework.h>
#include <security/mac/mac_internal.h>
#include <security/mac/mac_policy.h>
void
mac_prison_label_free(struct label *label)
{
if (label == NULL)
return;
MAC_POLICY_PERFORM_NOSLEEP(prison_destroy_label, label);
mac_labelzone_free(label);
}
struct label *
mac_prison_label_alloc(int flag)
{
struct label *label;
int error;
label = mac_labelzone_alloc(flag);
if (label == NULL)
return (NULL);
if (flag & M_WAITOK)
MAC_POLICY_CHECK(prison_init_label, label, flag);
else
MAC_POLICY_CHECK_NOSLEEP(prison_init_label, label, flag);
if (error) {
mac_prison_label_free(label);
return (NULL);
}
return (label);
}
/*
* The caller's expecting us to return with the prison locked if we were
* successful, since we're also setting pr->pr_label. On error, it remains
* unlocked.
*/
int
mac_prison_init(struct prison *pr, int flag)
{
struct label *prlabel;
mtx_assert(&pr->pr_mtx, MA_NOTOWNED);
if ((mac_labeled & MPC_OBJECT_PRISON) == 0) {
mtx_lock(&pr->pr_mtx);
pr->pr_label = NULL;
return (0);
}
prlabel = mac_prison_label_alloc(flag);
if (prlabel == NULL) {
KASSERT((flag & M_WAITOK) == 0,
("MAC policy prison_init_label failed under M_WAITOK"));
return (ENOMEM);
}
mtx_lock(&pr->pr_mtx);
pr->pr_label = prlabel;
return (0);
}
void
mac_prison_destroy(struct prison *pr)
{
mtx_assert(&pr->pr_mtx, MA_OWNED);
mac_prison_label_free(pr->pr_label);
pr->pr_label = NULL;
}
void
mac_prison_copy_label(struct label *src, struct label *dest)
{
MAC_POLICY_PERFORM_NOSLEEP(prison_copy_label, src, dest);
}
int
mac_prison_externalize_label(struct label *label, char *elements,
char *outbuf, size_t outbuflen)
{
int error;
MAC_POLICY_EXTERNALIZE(prison, label, elements, outbuf, outbuflen);
return (error);
}
int
mac_prison_internalize_label(struct label *label, char *string)
{
int error;
MAC_POLICY_INTERNALIZE(prison, label, string);
return (error);
}
void
mac_prison_relabel(struct ucred *cred, struct prison *pr,
struct label *newlabel)
{
mtx_assert(&pr->pr_mtx, MA_OWNED);
MAC_POLICY_PERFORM_NOSLEEP(prison_relabel, cred, pr, pr->pr_label,
newlabel);
}
int
mac_prison_label_set(struct ucred *cred, struct prison *pr,
struct label *label)
{
int error;
mtx_assert(&pr->pr_mtx, MA_OWNED);
error = mac_prison_check_relabel(cred, pr, label);
if (error)
return (error);
mac_prison_relabel(cred, pr, label);
return (0);
}
MAC_CHECK_PROBE_DEFINE4(prison_check_relabel, "struct ucred *",
"struct prison *", "struct label *", "struct label *");
int
mac_prison_check_relabel(struct ucred *cred, struct prison *pr,
struct label *newlabel)
{
int error;
mtx_assert(&pr->pr_mtx, MA_OWNED);
MAC_POLICY_CHECK_NOSLEEP(prison_check_relabel, cred, pr,
pr->pr_label, newlabel);
MAC_CHECK_PROBE4(prison_check_relabel, error, cred, pr,
pr->pr_label, newlabel);
return (error);
}
MAC_CHECK_PROBE_DEFINE3(prison_check_attach, "struct ucred *",
"struct prison *", "struct label *");
int
mac_prison_check_attach(struct ucred *cred, struct prison *pr)
{
int error;
MAC_POLICY_CHECK_NOSLEEP(prison_check_attach, cred, pr, pr->pr_label);
MAC_CHECK_PROBE3(prison_check_attach, error, cred, pr, pr->pr_label);
return (error);
}
MAC_CHECK_PROBE_DEFINE3(prison_check_create, "struct ucred *",
"struct vfsoptlist *", "int");
int
mac_prison_check_create(struct ucred *cred, struct vfsoptlist *opts,
int flags)
{
int error;
MAC_POLICY_CHECK_NOSLEEP(prison_check_create, cred, opts, flags);
MAC_CHECK_PROBE3(prison_check_create, error, cred, opts, flags);
return (error);
}
MAC_CHECK_PROBE_DEFINE5(prison_check_get, "struct ucred *",
"struct prison *", "struct label *", "struct vfsoptlist *", "int");
int
mac_prison_check_get(struct ucred *cred, struct prison *pr,
struct vfsoptlist *opts, int flags)
{
int error;
MAC_POLICY_CHECK_NOSLEEP(prison_check_get, cred, pr, pr->pr_label,
opts, flags);
MAC_CHECK_PROBE5(prison_check_get, error, cred, pr, pr->pr_label, opts,
flags);
return (error);
}
MAC_CHECK_PROBE_DEFINE5(prison_check_set, "struct ucred *",
"struct prison *", "struct label *", "struct vfsoptlist *", "int");
int
mac_prison_check_set(struct ucred *cred, struct prison *pr,
struct vfsoptlist *opts, int flags)
{
int error;
MAC_POLICY_CHECK_NOSLEEP(prison_check_set, cred, pr, pr->pr_label,
opts, flags);
MAC_CHECK_PROBE5(prison_check_set, error, cred, pr, pr->pr_label, opts,
flags);
return (error);
}
MAC_CHECK_PROBE_DEFINE3(prison_check_remove, "struct ucred *",
"struct prison *", "struct label *");
int
mac_prison_check_remove(struct ucred *cred, struct prison *pr)
{
int error;
MAC_POLICY_CHECK_NOSLEEP(prison_check_remove, cred, pr, pr->pr_label);
MAC_CHECK_PROBE3(prison_check_remove, error, cred, pr, pr->pr_label);
return (error);
}
void
mac_prison_created(struct ucred *cred, struct prison *pr)
{
MAC_POLICY_PERFORM(prison_created, cred, pr, pr->pr_label);
}
void
mac_prison_attached(struct ucred *cred, struct prison *pr, struct proc *p)
{
MAC_POLICY_PERFORM(prison_attached, cred, pr, pr->pr_label, p,
p->p_label);
}
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