fc5d29ef7d
credential selection, rather than reference via a thread or process pointer. This is part of a gradual migration to suser() accepting a struct ucred instead of a struct proc, simplifying the reference and locking semantics of suser(). Obtained from: TrustedBSD Project
222 lines
4.4 KiB
C
222 lines
4.4 KiB
C
/*
|
|
* ----------------------------------------------------------------------------
|
|
* "THE BEER-WARE LICENSE" (Revision 42):
|
|
* <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
|
|
* can do whatever you want with this stuff. If we meet some day, and you think
|
|
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
|
|
* ----------------------------------------------------------------------------
|
|
*
|
|
* $FreeBSD$
|
|
*
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/types.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/sysproto.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/jail.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/sysctl.h>
|
|
#include <net/if.h>
|
|
#include <netinet/in.h>
|
|
|
|
MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
|
|
|
|
SYSCTL_NODE(, OID_AUTO, jail, CTLFLAG_RW, 0,
|
|
"Jail rules");
|
|
|
|
mp_fixme("these variables need a lock")
|
|
|
|
int jail_set_hostname_allowed = 1;
|
|
SYSCTL_INT(_jail, OID_AUTO, set_hostname_allowed, CTLFLAG_RW,
|
|
&jail_set_hostname_allowed, 0,
|
|
"Processes in jail can set their hostnames");
|
|
|
|
int jail_socket_unixiproute_only = 1;
|
|
SYSCTL_INT(_jail, OID_AUTO, socket_unixiproute_only, CTLFLAG_RW,
|
|
&jail_socket_unixiproute_only, 0,
|
|
"Processes in jail are limited to creating UNIX/IPv4/route sockets only");
|
|
|
|
int jail_sysvipc_allowed = 0;
|
|
SYSCTL_INT(_jail, OID_AUTO, sysvipc_allowed, CTLFLAG_RW,
|
|
&jail_sysvipc_allowed, 0,
|
|
"Processes in jail can use System V IPC primitives");
|
|
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
jail(td, uap)
|
|
struct thread *td;
|
|
struct jail_args /* {
|
|
syscallarg(struct jail *) jail;
|
|
} */ *uap;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
int error;
|
|
struct prison *pr;
|
|
struct jail j;
|
|
struct chroot_args ca;
|
|
struct ucred *newcred = NULL, *oldcred;
|
|
|
|
error = copyin(uap->jail, &j, sizeof j);
|
|
if (error)
|
|
return (error);
|
|
if (j.version != 0)
|
|
return (EINVAL);
|
|
|
|
mtx_lock(&Giant);
|
|
MALLOC(pr, struct prison *, sizeof *pr , M_PRISON, M_WAITOK | M_ZERO);
|
|
pr->pr_securelevel = securelevel;
|
|
error = copyinstr(j.hostname, &pr->pr_host, sizeof pr->pr_host, 0);
|
|
if (error)
|
|
goto bail;
|
|
ca.path = j.path;
|
|
error = chroot(td, &ca);
|
|
if (error)
|
|
goto bail;
|
|
newcred = crget();
|
|
pr->pr_ip = j.ip_number;
|
|
PROC_LOCK(p);
|
|
/* Implicitly fail if already in jail. */
|
|
error = suser_xxx(p->p_ucred, NULL, 0);
|
|
if (error)
|
|
goto badcred;
|
|
oldcred = p->p_ucred;
|
|
crcopy(newcred, oldcred);
|
|
p->p_ucred = newcred;
|
|
p->p_ucred->cr_prison = pr;
|
|
pr->pr_ref = 1;
|
|
PROC_UNLOCK(p);
|
|
crfree(oldcred);
|
|
mtx_unlock(&Giant);
|
|
return (0);
|
|
badcred:
|
|
PROC_UNLOCK(p);
|
|
crfree(newcred);
|
|
bail:
|
|
FREE(pr, M_PRISON);
|
|
mtx_unlock(&Giant);
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
prison_free(struct prison *pr)
|
|
{
|
|
|
|
pr->pr_ref--;
|
|
if (pr->pr_ref == 0) {
|
|
if (pr->pr_linux != NULL)
|
|
FREE(pr->pr_linux, M_PRISON);
|
|
FREE(pr, M_PRISON);
|
|
}
|
|
}
|
|
|
|
void
|
|
prison_hold(struct prison *pr)
|
|
{
|
|
|
|
pr->pr_ref++;
|
|
}
|
|
|
|
int
|
|
prison_ip(struct ucred *cred, int flag, u_int32_t *ip)
|
|
{
|
|
u_int32_t tmp;
|
|
|
|
if (!jailed(cred))
|
|
return (0);
|
|
if (flag)
|
|
tmp = *ip;
|
|
else
|
|
tmp = ntohl(*ip);
|
|
if (tmp == INADDR_ANY) {
|
|
if (flag)
|
|
*ip = cred->cr_prison->pr_ip;
|
|
else
|
|
*ip = htonl(cred->cr_prison->pr_ip);
|
|
return (0);
|
|
}
|
|
if (tmp == INADDR_LOOPBACK) {
|
|
if (flag)
|
|
*ip = cred->cr_prison->pr_ip;
|
|
else
|
|
*ip = htonl(cred->cr_prison->pr_ip);
|
|
return (0);
|
|
}
|
|
if (cred->cr_prison->pr_ip != tmp)
|
|
return (1);
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
prison_remote_ip(struct ucred *cred, int flag, u_int32_t *ip)
|
|
{
|
|
u_int32_t tmp;
|
|
|
|
if (!jailed(cred))
|
|
return;
|
|
if (flag)
|
|
tmp = *ip;
|
|
else
|
|
tmp = ntohl(*ip);
|
|
if (tmp == INADDR_LOOPBACK) {
|
|
if (flag)
|
|
*ip = cred->cr_prison->pr_ip;
|
|
else
|
|
*ip = htonl(cred->cr_prison->pr_ip);
|
|
return;
|
|
}
|
|
return;
|
|
}
|
|
|
|
int
|
|
prison_if(struct ucred *cred, struct sockaddr *sa)
|
|
{
|
|
struct sockaddr_in *sai = (struct sockaddr_in*) sa;
|
|
int ok;
|
|
|
|
if ((sai->sin_family != AF_INET) && jail_socket_unixiproute_only)
|
|
ok = 1;
|
|
else if (sai->sin_family != AF_INET)
|
|
ok = 0;
|
|
else if (cred->cr_prison->pr_ip != ntohl(sai->sin_addr.s_addr))
|
|
ok = 1;
|
|
else
|
|
ok = 0;
|
|
return (ok);
|
|
}
|
|
|
|
/*
|
|
* Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
|
|
*/
|
|
int
|
|
prison_check(cred1, cred2)
|
|
struct ucred *cred1, *cred2;
|
|
{
|
|
|
|
if (jailed(cred1)) {
|
|
if (!jailed(cred2))
|
|
return (ESRCH);
|
|
if (cred2->cr_prison != cred1->cr_prison)
|
|
return (ESRCH);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return 1 if the passed credential is in a jail, otherwise 0.
|
|
*/
|
|
int
|
|
jailed(cred)
|
|
struct ucred *cred;
|
|
{
|
|
|
|
return (cred->cr_prison != NULL);
|
|
}
|