450 lines
9.3 KiB
C
450 lines
9.3 KiB
C
/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*
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* $FreeBSD$
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*
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*/
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/errno.h>
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#include <sys/sysproto.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/jail.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/namei.h>
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#include <sys/queue.h>
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#include <sys/socket.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysctl.h>
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#include <sys/vnode.h>
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#include <net/if.h>
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#include <netinet/in.h>
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MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
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SYSCTL_DECL(_security);
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SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0,
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"Jail rules");
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mp_fixme("these variables need a lock")
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int jail_set_hostname_allowed = 1;
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SYSCTL_INT(_security_jail, OID_AUTO, set_hostname_allowed, CTLFLAG_RW,
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&jail_set_hostname_allowed, 0,
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"Processes in jail can set their hostnames");
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int jail_socket_unixiproute_only = 1;
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SYSCTL_INT(_security_jail, OID_AUTO, socket_unixiproute_only, CTLFLAG_RW,
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&jail_socket_unixiproute_only, 0,
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"Processes in jail are limited to creating UNIX/IPv4/route sockets only");
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int jail_sysvipc_allowed = 0;
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SYSCTL_INT(_security_jail, OID_AUTO, sysvipc_allowed, CTLFLAG_RW,
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&jail_sysvipc_allowed, 0,
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"Processes in jail can use System V IPC primitives");
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/* allprison, lastprid, and prisoncount are protected by allprison_mtx. */
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struct prisonlist allprison;
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struct mtx allprison_mtx;
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int lastprid = 0;
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int prisoncount = 0;
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static void init_prison(void *);
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static struct prison *prison_find(int);
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static int sysctl_jail_list(SYSCTL_HANDLER_ARGS);
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static void
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init_prison(void *data __unused)
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{
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mtx_init(&allprison_mtx, "allprison", NULL, MTX_DEF);
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LIST_INIT(&allprison);
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}
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SYSINIT(prison, SI_SUB_INTRINSIC, SI_ORDER_ANY, init_prison, NULL);
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/*
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* MPSAFE
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*
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* struct jail_args {
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* struct jail *jail;
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* };
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*/
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int
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jail(struct thread *td, struct jail_args *uap)
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{
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struct nameidata nd;
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struct prison *pr, *tpr;
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struct jail j;
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struct jail_attach_args jaa;
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int error, tryprid;
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error = copyin(uap->jail, &j, sizeof(j));
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if (error)
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return (error);
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if (j.version != 0)
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return (EINVAL);
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MALLOC(pr, struct prison *, sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
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mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF);
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pr->pr_ref = 1;
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error = copyinstr(j.path, &pr->pr_path, sizeof(pr->pr_path), 0);
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if (error)
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goto e_killmtx;
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mtx_lock(&Giant);
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NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, pr->pr_path, td);
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error = namei(&nd);
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if (error) {
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mtx_unlock(&Giant);
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goto e_killmtx;
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}
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pr->pr_root = nd.ni_vp;
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VOP_UNLOCK(nd.ni_vp, 0, td);
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NDFREE(&nd, NDF_ONLY_PNBUF);
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mtx_unlock(&Giant);
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error = copyinstr(j.hostname, &pr->pr_host, sizeof(pr->pr_host), 0);
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if (error)
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goto e_dropvnref;
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pr->pr_ip = j.ip_number;
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pr->pr_linux = NULL;
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pr->pr_securelevel = securelevel;
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/* Determine next pr_id and add prison to allprison list. */
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mtx_lock(&allprison_mtx);
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tryprid = lastprid + 1;
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if (tryprid == JAIL_MAX)
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tryprid = 1;
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next:
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LIST_FOREACH(tpr, &allprison, pr_list) {
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if (tpr->pr_id == tryprid) {
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tryprid++;
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if (tryprid == JAIL_MAX) {
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mtx_unlock(&allprison_mtx);
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error = EAGAIN;
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goto e_dropvnref;
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}
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goto next;
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}
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}
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pr->pr_id = jaa.jid = lastprid = tryprid;
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LIST_INSERT_HEAD(&allprison, pr, pr_list);
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prisoncount++;
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mtx_unlock(&allprison_mtx);
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error = jail_attach(td, &jaa);
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if (error)
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goto e_dropprref;
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mtx_lock(&pr->pr_mtx);
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pr->pr_ref--;
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mtx_unlock(&pr->pr_mtx);
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td->td_retval[0] = jaa.jid;
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return (0);
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e_dropprref:
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mtx_lock(&allprison_mtx);
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LIST_REMOVE(pr, pr_list);
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prisoncount--;
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mtx_unlock(&allprison_mtx);
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e_dropvnref:
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mtx_lock(&Giant);
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vrele(pr->pr_root);
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mtx_unlock(&Giant);
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e_killmtx:
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mtx_destroy(&pr->pr_mtx);
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FREE(pr, M_PRISON);
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return (error);
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}
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/*
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* MPSAFE
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*
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* struct jail_attach_args {
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* int jid;
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* };
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*/
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int
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jail_attach(struct thread *td, struct jail_attach_args *uap)
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{
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struct proc *p;
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struct ucred *newcred, *oldcred;
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struct prison *pr;
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int error;
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p = td->td_proc;
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mtx_lock(&allprison_mtx);
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pr = prison_find(uap->jid);
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if (pr == NULL) {
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mtx_unlock(&allprison_mtx);
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return (EINVAL);
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}
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pr->pr_ref++;
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mtx_unlock(&pr->pr_mtx);
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mtx_unlock(&allprison_mtx);
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error = suser_cred(td->td_ucred, PRISON_ROOT);
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if (error)
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goto e_dropref;
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mtx_lock(&Giant);
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vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY, td);
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if ((error = change_dir(pr->pr_root, td)) != 0)
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goto e_unlock;
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#ifdef MAC
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if ((error = mac_check_vnode_chroot(td->td_ucred, pr->pr_root)))
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goto e_unlock;
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#endif
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VOP_UNLOCK(pr->pr_root, 0, td);
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change_root(pr->pr_root, td);
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mtx_unlock(&Giant);
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newcred = crget();
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PROC_LOCK(p);
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/* Implicitly fail if already in jail. */
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error = suser_cred(p->p_ucred, 0);
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if (error) {
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PROC_UNLOCK(p);
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crfree(newcred);
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goto e_dropref;
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}
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oldcred = p->p_ucred;
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setsugid(p);
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crcopy(newcred, oldcred);
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newcred->cr_prison = pr;
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p->p_ucred = newcred;
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PROC_UNLOCK(p);
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crfree(oldcred);
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return (0);
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e_unlock:
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VOP_UNLOCK(pr->pr_root, 0, td);
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mtx_unlock(&Giant);
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e_dropref:
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mtx_lock(&pr->pr_mtx);
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pr->pr_ref--;
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mtx_unlock(&pr->pr_mtx);
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return (error);
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}
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/*
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* Returns a locked prison instance, or NULL on failure.
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*/
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static struct prison *
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prison_find(int prid)
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{
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struct prison *pr;
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mtx_assert(&allprison_mtx, MA_OWNED);
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LIST_FOREACH(pr, &allprison, pr_list) {
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if (pr->pr_id == prid) {
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mtx_lock(&pr->pr_mtx);
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return (pr);
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}
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}
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return (NULL);
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}
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void
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prison_free(struct prison *pr)
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{
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mtx_assert(&Giant, MA_OWNED);
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mtx_lock(&allprison_mtx);
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mtx_lock(&pr->pr_mtx);
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pr->pr_ref--;
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if (pr->pr_ref == 0) {
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LIST_REMOVE(pr, pr_list);
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mtx_unlock(&pr->pr_mtx);
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prisoncount--;
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mtx_unlock(&allprison_mtx);
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vrele(pr->pr_root);
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mtx_destroy(&pr->pr_mtx);
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if (pr->pr_linux != NULL)
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FREE(pr->pr_linux, M_PRISON);
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FREE(pr, M_PRISON);
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return;
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}
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mtx_unlock(&pr->pr_mtx);
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mtx_unlock(&allprison_mtx);
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}
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void
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prison_hold(struct prison *pr)
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{
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mtx_lock(&pr->pr_mtx);
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pr->pr_ref++;
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mtx_unlock(&pr->pr_mtx);
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}
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u_int32_t
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prison_getip(struct ucred *cred)
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{
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return (cred->cr_prison->pr_ip);
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}
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int
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prison_ip(struct ucred *cred, int flag, u_int32_t *ip)
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{
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u_int32_t tmp;
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if (!jailed(cred))
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return (0);
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if (flag)
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tmp = *ip;
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else
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tmp = ntohl(*ip);
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if (tmp == INADDR_ANY) {
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if (flag)
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*ip = cred->cr_prison->pr_ip;
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else
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*ip = htonl(cred->cr_prison->pr_ip);
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return (0);
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}
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if (tmp == INADDR_LOOPBACK) {
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if (flag)
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*ip = cred->cr_prison->pr_ip;
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else
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*ip = htonl(cred->cr_prison->pr_ip);
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return (0);
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}
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if (cred->cr_prison->pr_ip != tmp)
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return (1);
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return (0);
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}
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void
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prison_remote_ip(struct ucred *cred, int flag, u_int32_t *ip)
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{
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u_int32_t tmp;
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if (!jailed(cred))
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return;
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if (flag)
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tmp = *ip;
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else
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tmp = ntohl(*ip);
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if (tmp == INADDR_LOOPBACK) {
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if (flag)
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*ip = cred->cr_prison->pr_ip;
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else
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*ip = htonl(cred->cr_prison->pr_ip);
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return;
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}
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return;
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}
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int
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prison_if(struct ucred *cred, struct sockaddr *sa)
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{
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struct sockaddr_in *sai;
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int ok;
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sai = (struct sockaddr_in *)sa;
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if ((sai->sin_family != AF_INET) && jail_socket_unixiproute_only)
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ok = 1;
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else if (sai->sin_family != AF_INET)
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ok = 0;
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else if (cred->cr_prison->pr_ip != ntohl(sai->sin_addr.s_addr))
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ok = 1;
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else
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ok = 0;
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return (ok);
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}
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/*
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* Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
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*/
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int
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prison_check(struct ucred *cred1, struct ucred *cred2)
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{
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if (jailed(cred1)) {
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if (!jailed(cred2))
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return (ESRCH);
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if (cred2->cr_prison != cred1->cr_prison)
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return (ESRCH);
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}
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return (0);
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}
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/*
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* Return 1 if the passed credential is in a jail, otherwise 0.
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*/
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int
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jailed(struct ucred *cred)
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{
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return (cred->cr_prison != NULL);
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}
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/*
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* Return the correct hostname for the passed credential.
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*/
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void
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getcredhostname(struct ucred *cred, char *buf, size_t size)
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{
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if (jailed(cred)) {
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mtx_lock(&cred->cr_prison->pr_mtx);
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strlcpy(buf, cred->cr_prison->pr_host, size);
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mtx_unlock(&cred->cr_prison->pr_mtx);
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} else
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strlcpy(buf, hostname, size);
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}
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static int
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sysctl_jail_list(SYSCTL_HANDLER_ARGS)
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{
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struct xprison *xp, *sxp;
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struct prison *pr;
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int count, error;
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mtx_assert(&Giant, MA_OWNED);
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retry:
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mtx_lock(&allprison_mtx);
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count = prisoncount;
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mtx_unlock(&allprison_mtx);
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if (count == 0)
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return (0);
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sxp = xp = malloc(sizeof(*xp) * count, M_TEMP, M_WAITOK | M_ZERO);
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mtx_lock(&allprison_mtx);
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if (count != prisoncount) {
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mtx_unlock(&allprison_mtx);
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free(sxp, M_TEMP);
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goto retry;
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}
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LIST_FOREACH(pr, &allprison, pr_list) {
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mtx_lock(&pr->pr_mtx);
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xp->pr_version = XPRISON_VERSION;
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xp->pr_id = pr->pr_id;
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strlcpy(xp->pr_path, pr->pr_path, sizeof(xp->pr_path));
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strlcpy(xp->pr_host, pr->pr_host, sizeof(xp->pr_host));
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xp->pr_ip = pr->pr_ip;
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mtx_unlock(&pr->pr_mtx);
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xp++;
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}
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mtx_unlock(&allprison_mtx);
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error = SYSCTL_OUT(req, sxp, sizeof(*sxp) * count);
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free(sxp, M_TEMP);
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if (error)
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return (error);
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return (0);
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}
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SYSCTL_OID(_security_jail, OID_AUTO, list, CTLTYPE_STRUCT | CTLFLAG_RD,
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NULL, 0, sysctl_jail_list, "S", "List of active jails");
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