Author: jamie
Date: Fri May 4 20:54:27 2018
New Revision: 333263
URL: https://svnweb.freebsd.org/changeset/base/333263
Log:
Make it easier for filesystems to count themselves as jail-enabled,
by doing most of the work in a new function prison_add_vfs in kern_jail.c
Now a jail-enabled filesystem need only mark itself with VFCF_JAIL, and
the rest is taken care of. This includes adding a jail parameter like
allow.mount.foofs, and a sysctl like security.jail.mount_foofs_allowed.
Both of these used to be a static list of known filesystems, with
predefined permission bits.
Reviewed by: kib
Differential Revision: D14681
Modified:
head/lib/libjail/jail.c
head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c
head/sys/compat/linprocfs/linprocfs.c
head/sys/compat/linsysfs/linsysfs.c
head/sys/fs/devfs/devfs_vfsops.c
head/sys/fs/fdescfs/fdesc_vfsops.c
head/sys/fs/nullfs/null_vfsops.c
head/sys/fs/procfs/procfs.c
head/sys/fs/pseudofs/pseudofs.h
head/sys/fs/tmpfs/tmpfs_vfsops.c
head/sys/kern/kern_jail.c
head/sys/kern/vfs_init.c
head/sys/kern/vfs_mount.c
head/sys/kern/vfs_subr.c
head/sys/sys/jail.h
head/sys/sys/mount.h
head/usr.sbin/jail/jail.8
Modified: head/lib/libjail/jail.c
==============================================================================
--- head/lib/libjail/jail.c Fri May 4 20:38:26 2018 (r333262)
+++ head/lib/libjail/jail.c Fri May 4 20:54:27 2018 (r333263)
@@ -1048,7 +1048,13 @@ kldload_param(const char *name)
else if (strcmp(name, "sysvmsg") == 0 || strcmp(name, "sysvsem") == 0 ||
strcmp(name, "sysvshm") == 0)
kl = kldload(name);
- else {
+ else if (strncmp(name, "allow.mount.", 12) == 0) {
+ /* Load the matching filesystem */
+ kl = kldload(name + 12);
+ if (kl < 0 && errno == ENOENT &&
+ strncmp(name + 12, "no", 2) == 0)
+ kl = kldload(name + 14);
+ } else {
errno = ENOENT;
return (-1);
}
Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c Fri May
4 20:38:26 2018 (r333262)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c Fri May
4 20:54:27 2018 (r333263)
@@ -1640,9 +1640,6 @@ zfs_mount(vfs_t *vfsp)
osname = spn.pn_path;
#else /* !illumos */
- if (!prison_allow(td->td_ucred, PR_ALLOW_MOUNT_ZFS))
- return (SET_ERROR(EPERM));
-
if (vfs_getopt(vfsp->mnt_optnew, "from", (void **)&osname, NULL))
return (SET_ERROR(EINVAL));
Modified: head/sys/compat/linprocfs/linprocfs.c
==============================================================================
--- head/sys/compat/linprocfs/linprocfs.c Fri May 4 20:38:26 2018
(r333262)
+++ head/sys/compat/linprocfs/linprocfs.c Fri May 4 20:54:27 2018
(r333263)
@@ -1652,7 +1652,7 @@ linprocfs_uninit(PFS_INIT_ARGS)
return (0);
}
-PSEUDOFS(linprocfs, 1, PR_ALLOW_MOUNT_LINPROCFS);
+PSEUDOFS(linprocfs, 1, VFCF_JAIL);
#if defined(__amd64__)
MODULE_DEPEND(linprocfs, linux_common, 1, 1, 1);
#else
Modified: head/sys/compat/linsysfs/linsysfs.c
==============================================================================
--- head/sys/compat/linsysfs/linsysfs.c Fri May 4 20:38:26 2018
(r333262)
+++ head/sys/compat/linsysfs/linsysfs.c Fri May 4 20:54:27 2018
(r333263)
@@ -556,7 +556,7 @@ linsysfs_uninit(PFS_INIT_ARGS)
return (0);
}
-PSEUDOFS(linsysfs, 1, PR_ALLOW_MOUNT_LINSYSFS);
+PSEUDOFS(linsysfs, 1, VFCF_JAIL);
#if defined(__amd64__)
MODULE_DEPEND(linsysfs, linux_common, 1, 1, 1);
#else
Modified: head/sys/fs/devfs/devfs_vfsops.c
==============================================================================
--- head/sys/fs/devfs/devfs_vfsops.c Fri May 4 20:38:26 2018
(r333262)
+++ head/sys/fs/devfs/devfs_vfsops.c Fri May 4 20:54:27 2018
(r333263)
@@ -83,9 +83,6 @@ devfs_mount(struct mount *mp)
if (mp->mnt_flag & MNT_ROOTFS)
return (EOPNOTSUPP);
- if (!prison_allow(td->td_ucred, PR_ALLOW_MOUNT_DEVFS))
- return (EPERM);
-
rsnum = 0;
injail = jailed(td->td_ucred);
Modified: head/sys/fs/fdescfs/fdesc_vfsops.c
==============================================================================
--- head/sys/fs/fdescfs/fdesc_vfsops.c Fri May 4 20:38:26 2018
(r333262)
+++ head/sys/fs/fdescfs/fdesc_vfsops.c Fri May 4 20:54:27 2018
(r333263)
@@ -81,12 +81,8 @@ static int
fdesc_mount(struct mount *mp)
{
struct fdescmount *fmp;
- struct thread *td = curthread;
struct vnode *rvp;
int error;
-
- if (!prison_allow(td->td_ucred, PR_ALLOW_MOUNT_FDESCFS))
- return (EPERM);
/*
* Update is a no-op
Modified: head/sys/fs/nullfs/null_vfsops.c
==============================================================================
--- head/sys/fs/nullfs/null_vfsops.c Fri May 4 20:38:26 2018
(r333262)
+++ head/sys/fs/nullfs/null_vfsops.c Fri May 4 20:54:27 2018
(r333263)
@@ -78,15 +78,12 @@ nullfs_mount(struct mount *mp)
struct vnode *lowerrootvp, *vp;
struct vnode *nullm_rootvp;
struct null_mount *xmp;
- struct thread *td = curthread;
char *target;
int isvnunlocked = 0, len;
struct nameidata nd, *ndp = &nd;
NULLFSDEBUG("nullfs_mount(mp = %p)\n", (void *)mp);
- if (!prison_allow(td->td_ucred, PR_ALLOW_MOUNT_NULLFS))
- return (EPERM);
if (mp->mnt_flag & MNT_ROOTFS)
return (EOPNOTSUPP);
Modified: head/sys/fs/procfs/procfs.c
==============================================================================
--- head/sys/fs/procfs/procfs.c Fri May 4 20:38:26 2018 (r333262)
+++ head/sys/fs/procfs/procfs.c Fri May 4 20:54:27 2018 (r333263)
@@ -215,4 +215,4 @@ procfs_uninit(PFS_INIT_ARGS)
return (0);
}
-PSEUDOFS(procfs, 1, PR_ALLOW_MOUNT_PROCFS);
+PSEUDOFS(procfs, 1, VFCF_JAIL);
Modified: head/sys/fs/pseudofs/pseudofs.h
==============================================================================
--- head/sys/fs/pseudofs/pseudofs.h Fri May 4 20:38:26 2018
(r333262)
+++ head/sys/fs/pseudofs/pseudofs.h Fri May 4 20:54:27 2018
(r333263)
@@ -272,7 +272,7 @@ int pfs_destroy (struct pfs_node *pn);
/*
* Now for some initialization magic...
*/
-#define PSEUDOFS(name, version, jflag) \
+#define PSEUDOFS(name, version, flags) \
\
static struct pfs_info name##_info = { \
#name, \
@@ -282,8 +282,6 @@ static struct pfs_info name##_info = {
\
\
static int \
_##name##_mount(struct mount *mp) { \
- if (jflag && !prison_allow(curthread->td_ucred, jflag))
\
- return (EPERM);
\
return (pfs_mount(&name##_info, mp)); \
} \
\
@@ -306,7 +304,7 @@ static struct vfsops name##_vfsops = {
\
.vfs_uninit = _##name##_uninit, \
.vfs_unmount = pfs_unmount, \
}; \
-VFS_SET(name##_vfsops, name, VFCF_SYNTHETIC | (jflag ? VFCF_JAIL : 0));
\
+VFS_SET(name##_vfsops, name, VFCF_SYNTHETIC | flags); \
MODULE_VERSION(name, version); \
MODULE_DEPEND(name, pseudofs, 1, 1, 1);
Modified: head/sys/fs/tmpfs/tmpfs_vfsops.c
==============================================================================
--- head/sys/fs/tmpfs/tmpfs_vfsops.c Fri May 4 20:38:26 2018
(r333262)
+++ head/sys/fs/tmpfs/tmpfs_vfsops.c Fri May 4 20:54:27 2018
(r333263)
@@ -141,7 +141,6 @@ tmpfs_mount(struct mount *mp)
sizeof(struct tmpfs_dirent) + sizeof(struct tmpfs_node));
struct tmpfs_mount *tmp;
struct tmpfs_node *root;
- struct thread *td = curthread;
int error;
bool nonc;
/* Size counters. */
@@ -154,9 +153,6 @@ tmpfs_mount(struct mount *mp)
mode_t root_mode;
struct vattr va;
-
- if (!prison_allow(td->td_ucred, PR_ALLOW_MOUNT_TMPFS))
- return (EPERM);
if (vfs_filteropt(mp->mnt_optnew, tmpfs_opts))
return (EINVAL);
Modified: head/sys/kern/kern_jail.c
==============================================================================
--- head/sys/kern/kern_jail.c Fri May 4 20:38:26 2018 (r333262)
+++ head/sys/kern/kern_jail.c Fri May 4 20:54:27 2018 (r333263)
@@ -111,7 +111,7 @@ struct prison prison0 = {
#else
.pr_flags = PR_HOST|_PR_IP_SADDRSEL,
#endif
- .pr_allow = PR_ALLOW_ALL,
+ .pr_allow = PR_ALLOW_ALL_STATIC,
};
MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
@@ -181,7 +181,8 @@ static struct jailsys_flags pr_flag_jailsys[] = {
};
const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
-static struct bool_flags pr_flag_allow[] = {
+/* Make this array full-size so dynamic parameters can be added. */
+static struct bool_flags pr_flag_allow[NBBY * NBPW] = {
{"allow.set_hostname", "allow.noset_hostname", PR_ALLOW_SET_HOSTNAME},
{"allow.sysvipc", "allow.nosysvipc", PR_ALLOW_SYSVIPC},
{"allow.raw_sockets", "allow.noraw_sockets", PR_ALLOW_RAW_SOCKETS},
@@ -189,17 +190,6 @@ static struct bool_flags pr_flag_allow[] = {
{"allow.mount", "allow.nomount", PR_ALLOW_MOUNT},
{"allow.quotas", "allow.noquotas", PR_ALLOW_QUOTAS},
{"allow.socket_af", "allow.nosocket_af", PR_ALLOW_SOCKET_AF},
- {"allow.mount.devfs", "allow.mount.nodevfs", PR_ALLOW_MOUNT_DEVFS},
- {"allow.mount.nullfs", "allow.mount.nonullfs", PR_ALLOW_MOUNT_NULLFS},
- {"allow.mount.zfs", "allow.mount.nozfs", PR_ALLOW_MOUNT_ZFS},
- {"allow.mount.procfs", "allow.mount.noprocfs", PR_ALLOW_MOUNT_PROCFS},
- {"allow.mount.tmpfs", "allow.mount.notmpfs", PR_ALLOW_MOUNT_TMPFS},
- {"allow.mount.fdescfs", "allow.mount.nofdescfs",
- PR_ALLOW_MOUNT_FDESCFS},
- {"allow.mount.linprocfs", "allow.mount.nolinprocfs",
- PR_ALLOW_MOUNT_LINPROCFS},
- {"allow.mount.linsysfs", "allow.mount.nolinsysfs",
- PR_ALLOW_MOUNT_LINSYSFS},
{"allow.reserved_ports", "allow.noreserved_ports",
PR_ALLOW_RESERVED_PORTS},
};
@@ -318,7 +308,8 @@ kern_jail(struct thread *td, struct jail *j)
/* Set permissions for top-level jails from sysctls. */
if (!jailed(td->td_ucred)) {
for (bf = pr_flag_allow;
- bf < pr_flag_allow + nitems(pr_flag_allow);
+ bf < pr_flag_allow + nitems(pr_flag_allow) &&
+ bf->flag != 0;
bf++) {
optiov[opt.uio_iovcnt].iov_base = __DECONST(char *,
(jail_default_allow & bf->flag)
@@ -654,7 +645,7 @@ kern_jail_set(struct thread *td, struct uio *optuio, i
pr_allow = ch_allow = 0;
for (bf = pr_flag_allow;
- bf < pr_flag_allow + nitems(pr_flag_allow);
+ bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0;
bf++) {
vfs_flagopt(opts, bf->name, &pr_allow, bf->flag);
vfs_flagopt(opts, bf->noname, &ch_allow, bf->flag);
@@ -2115,7 +2106,7 @@ kern_jail_get(struct thread *td, struct uio *optuio, i
goto done_deref;
}
for (bf = pr_flag_allow;
- bf < pr_flag_allow + nitems(pr_flag_allow);
+ bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0;
bf++) {
i = (pr->pr_allow & bf->flag) ? 1 : 0;
error = vfs_setopt(opts, bf->name, &i, sizeof(i));
@@ -3615,38 +3606,6 @@ SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
"Processes in jail can mount/unmount jail-friendly file systems
(deprecated)");
-SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed,
- CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
- NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I",
- "Processes in jail can mount the devfs file system (deprecated)");
-SYSCTL_PROC(_security_jail, OID_AUTO, mount_fdescfs_allowed,
- CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
- NULL, PR_ALLOW_MOUNT_FDESCFS, sysctl_jail_default_allow, "I",
- "Processes in jail can mount the fdescfs file system (deprecated)");
-SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed,
- CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
- NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I",
- "Processes in jail can mount the nullfs file system (deprecated)");
-SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed,
- CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
- NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I",
- "Processes in jail can mount the procfs file system (deprecated)");
-SYSCTL_PROC(_security_jail, OID_AUTO, mount_linprocfs_allowed,
- CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
- NULL, PR_ALLOW_MOUNT_LINPROCFS, sysctl_jail_default_allow, "I",
- "Processes in jail can mount the linprocfs file system (deprecated)");
-SYSCTL_PROC(_security_jail, OID_AUTO, mount_linsysfs_allowed,
- CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
- NULL, PR_ALLOW_MOUNT_LINSYSFS, sysctl_jail_default_allow, "I",
- "Processes in jail can mount the linsysfs file system (deprecated)");
-SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed,
- CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
- NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I",
- "Processes in jail can mount the tmpfs file system (deprecated)");
-SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed,
- CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
- NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I",
- "Processes in jail can mount the zfs file system (deprecated)");
static int
sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
@@ -3799,23 +3758,111 @@ SYSCTL_JAIL_PARAM(_allow, reserved_ports, CTLTYPE_INT
SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
"B", "Jail may mount/unmount jail-friendly file systems in general");
-SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW,
- "B", "Jail may mount the devfs file system");
-SYSCTL_JAIL_PARAM(_allow_mount, fdescfs, CTLTYPE_INT | CTLFLAG_RW,
- "B", "Jail may mount the fdescfs file system");
-SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW,
- "B", "Jail may mount the nullfs file system");
-SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW,
- "B", "Jail may mount the procfs file system");
-SYSCTL_JAIL_PARAM(_allow_mount, linprocfs, CTLTYPE_INT | CTLFLAG_RW,
- "B", "Jail may mount the linprocfs file system");
-SYSCTL_JAIL_PARAM(_allow_mount, linsysfs, CTLTYPE_INT | CTLFLAG_RW,
- "B", "Jail may mount the linsysfs file system");
-SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW,
- "B", "Jail may mount the tmpfs file system");
-SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW,
- "B", "Jail may mount the zfs file system");
+/*
+ * The VFS system will register jail-aware filesystems here. They each get
+ * a parameter allow.mount.xxxfs and a flag to check when a jailed user
+ * attempts to mount.
+ */
+void
+prison_add_vfs(struct vfsconf *vfsp)
+{
+ char *allow_name, *allow_noname, *mount_allowed;
+ struct bool_flags *bf;
+#ifndef NO_SYSCTL_DESCR
+ char *descr;
+#endif
+ unsigned allow_flag;
+
+ if (asprintf(&allow_name, M_PRISON, "allow.mount.%s", vfsp->vfc_name) <
+ 0 || asprintf(&allow_noname, M_PRISON, "allow.mount.no%s",
+ vfsp->vfc_name) < 0) {
+ free(allow_name, M_PRISON);
+ return;
+ }
+
+ /*
+ * See if this parameter has already beed added, i.e. if the filesystem
+ * was previously loaded/unloaded.
+ */
+ mtx_lock(&prison0.pr_mtx);
+ for (bf = pr_flag_allow;
+ bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0;
+ bf++) {
+ if (strcmp(bf->name, allow_name) == 0) {
+ vfsp->vfc_prison_flag = bf->flag;
+ goto no_add;
+ }
+ }
+
+ /*
+ * Find a free bit in prison0's pr_allow, failing if there are none
+ * (which shouldn't happen as long as we keep track of how many
+ * filesystems are jail-aware).
+ */
+ for (allow_flag = 1;; allow_flag <<= 1) {
+ if (allow_flag == 0)
+ goto no_add;
+ if ((prison0.pr_allow & allow_flag) == 0)
+ break;
+ }
+
+ /*
+ * Note the parameter in the next open slot in pr_flag_allow.
+ * Set the flag last so code that checks pr_flag_allow can do so
+ * without locking.
+ */
+ for (bf = pr_flag_allow; bf->flag != 0; bf++)
+ if (bf == pr_flag_allow + nitems(pr_flag_allow)) {
+ /* This should never happen, but is not fatal. */
+ goto no_add;
+ }
+ prison0.pr_allow |= allow_flag;
+ bf->name = allow_name;
+ bf->noname = allow_noname;
+ bf->flag = allow_flag;
+ vfsp->vfc_prison_flag = allow_flag;
+ mtx_unlock(&prison0.pr_mtx);
+
+ /*
+ * Create sysctls for the paramter, and the back-compat global
+ * permission.
+ */
+#ifndef NO_SYSCTL_DESCR
+ (void)asprintf(&descr, M_TEMP, "Jail may mount the %s file system",
+ vfsp->vfc_name);
+#endif
+ (void)SYSCTL_ADD_PROC(NULL,
+ SYSCTL_CHILDREN(&sysctl___security_jail_param_allow_mount),
+ OID_AUTO, vfsp->vfc_name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
+ NULL, 0, sysctl_jail_param, "B", descr);
+#ifndef NO_SYSCTL_DESCR
+ free(descr, M_TEMP);
+#endif
+ if (asprintf(&mount_allowed, M_TEMP, "mount_%s_allowed",
+ vfsp->vfc_name) >= 0) {
+#ifndef NO_SYSCTL_DESCR
+ (void)asprintf(&descr, M_TEMP,
+ "Processes in jail can mount the %s file system (deprecated)",
+ vfsp->vfc_name);
+#endif
+ (void)SYSCTL_ADD_PROC(NULL,
+ SYSCTL_CHILDREN(&sysctl___security_jail), OID_AUTO,
+ mount_allowed, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
+ NULL, allow_flag, sysctl_jail_default_allow, "I", descr);
+#ifndef NO_SYSCTL_DESCR
+ free(descr, M_TEMP);
+#endif
+ free(mount_allowed, M_TEMP);
+ }
+ return;
+
+ no_add:
+ mtx_unlock(&prison0.pr_mtx);
+ free(allow_name, M_PRISON);
+ free(allow_noname, M_PRISON);
+}
+
#ifdef RACCT
void
prison_racct_foreach(void (*callback)(struct racct *racct,
@@ -4050,7 +4097,7 @@ db_show_prison(struct prison *pr)
}
db_printf(" allow = 0x%x", pr->pr_allow);
for (bf = pr_flag_allow;
- bf < pr_flag_allow + nitems(pr_flag_allow);
+ bf < pr_flag_allow + nitems(pr_flag_allow) && bf->flag != 0;
bf++)
if (pr->pr_allow & bf->flag)
db_printf(" %s", bf->name);
Modified: head/sys/kern/vfs_init.c
==============================================================================
--- head/sys/kern/vfs_init.c Fri May 4 20:38:26 2018 (r333262)
+++ head/sys/kern/vfs_init.c Fri May 4 20:54:27 2018 (r333263)
@@ -42,6 +42,7 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/fnv_hash.h>
+#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/linker.h>
#include <sys/mount.h>
@@ -276,7 +277,10 @@ vfs_register(struct vfsconf *vfc)
vfsops->vfs_extattrctl = vfs_stdextattrctl;
if (vfsops->vfs_sysctl == NULL)
vfsops->vfs_sysctl = vfs_stdsysctl;
-
+
+ if (vfc->vfc_flags & VFCF_JAIL)
+ prison_add_vfs(vfc);
+
/*
* Call init function for this VFS...
*/
Modified: head/sys/kern/vfs_mount.c
==============================================================================
--- head/sys/kern/vfs_mount.c Fri May 4 20:38:26 2018 (r333262)
+++ head/sys/kern/vfs_mount.c Fri May 4 20:54:27 2018 (r333263)
@@ -843,6 +843,16 @@ vfs_domount_first(
KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here"));
/*
+ * If the jail of the calling thread lacks permission for this type of
+ * file system, deny immediately.
+ */
+ if (jailed(td->td_ucred) && !prison_allow(td->td_ucred,
+ vfsp->vfc_prison_flag)) {
+ vput(vp);
+ return (EPERM);
+ }
+
+ /*
* If the user is not root, ensure that they own the directory
* onto which we are attempting to mount.
*/
@@ -1149,8 +1159,6 @@ vfs_domount(
vfsp = vfs_byname_kld(fstype, td, &error);
if (vfsp == NULL)
return (ENODEV);
- if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL))
- return (EPERM);
}
/*
Modified: head/sys/kern/vfs_subr.c
==============================================================================
--- head/sys/kern/vfs_subr.c Fri May 4 20:38:26 2018 (r333262)
+++ head/sys/kern/vfs_subr.c Fri May 4 20:54:27 2018 (r333263)
@@ -683,19 +683,21 @@ vfs_suser(struct mount *mp, struct thread *td)
{
int error;
- /*
- * If the thread is jailed, but this is not a jail-friendly file
- * system, deny immediately.
- */
- if (!(mp->mnt_vfc->vfc_flags & VFCF_JAIL) && jailed(td->td_ucred))
- return (EPERM);
+ if (jailed(td->td_ucred)) {
+ /*
+ * If the jail of the calling thread lacks permission for
+ * this type of file system, deny immediately.
+ */
+ if (!prison_allow(td->td_ucred, mp->mnt_vfc->vfc_prison_flag))
+ return (EPERM);
- /*
- * If the file system was mounted outside the jail of the calling
- * thread, deny immediately.
- */
- if (prison_check(td->td_ucred, mp->mnt_cred) != 0)
- return (EPERM);
+ /*
+ * If the file system was mounted outside the jail of the
+ * calling thread, deny immediately.
+ */
+ if (prison_check(td->td_ucred, mp->mnt_cred) != 0)
+ return (EPERM);
+ }
/*
* If file system supports delegated administration, we don't check
Modified: head/sys/sys/jail.h
==============================================================================
--- head/sys/sys/jail.h Fri May 4 20:38:26 2018 (r333262)
+++ head/sys/sys/jail.h Fri May 4 20:54:27 2018 (r333263)
@@ -216,7 +216,10 @@ struct prison_racct {
#define PR_IP6 0x04000000 /* IPv6 restricted or disabled
*/
/* by this jail or an ancestor */
-/* Flags for pr_allow */
+/*
+ * Flags for pr_allow
+ * Bits not noted here may be used for dynamic allow.mount.xxxfs.
+ */
#define PR_ALLOW_SET_HOSTNAME 0x00000001
#define PR_ALLOW_SYSVIPC 0x00000002
#define PR_ALLOW_RAW_SOCKETS 0x00000004
@@ -224,17 +227,9 @@ struct prison_racct {
#define PR_ALLOW_MOUNT 0x00000010
#define PR_ALLOW_QUOTAS 0x00000020
#define PR_ALLOW_SOCKET_AF 0x00000040
-#define PR_ALLOW_MOUNT_DEVFS 0x00000080
-#define PR_ALLOW_MOUNT_NULLFS 0x00000100
-#define PR_ALLOW_MOUNT_ZFS 0x00000200
-#define PR_ALLOW_MOUNT_PROCFS 0x00000400
-#define PR_ALLOW_MOUNT_TMPFS 0x00000800
-#define PR_ALLOW_MOUNT_FDESCFS 0x00001000
-#define PR_ALLOW_MOUNT_LINPROCFS 0x00002000
-#define PR_ALLOW_MOUNT_LINSYSFS 0x00004000
#define PR_ALLOW_RESERVED_PORTS 0x00008000
#define PR_ALLOW_KMEM_ACCESS 0x00010000 /* reserved,
not used yet */
-#define PR_ALLOW_ALL 0x0001ffff
+#define PR_ALLOW_ALL_STATIC 0x0001807f
/*
* OSD methods
@@ -364,6 +359,7 @@ struct ucred;
struct mount;
struct sockaddr;
struct statfs;
+struct vfsconf;
int jailed(struct ucred *cred);
int jailed_without_vnet(struct ucred *);
void getcredhostname(struct ucred *, char *, size_t);
@@ -413,6 +409,7 @@ int prison_if(struct ucred *cred, struct sockaddr *sa)
char *prison_name(struct prison *, struct prison *);
int prison_priv_check(struct ucred *cred, int priv);
int sysctl_jail_param(SYSCTL_HANDLER_ARGS);
+void prison_add_vfs(struct vfsconf *vfsp);
void prison_racct_foreach(void (*callback)(struct racct *racct,
void *arg2, void *arg3), void (*pre)(void), void (*post)(void),
void *arg2, void *arg3);
Modified: head/sys/sys/mount.h
==============================================================================
--- head/sys/sys/mount.h Fri May 4 20:38:26 2018 (r333262)
+++ head/sys/sys/mount.h Fri May 4 20:54:27 2018 (r333263)
@@ -516,6 +516,7 @@ struct vfsconf {
int vfc_typenum; /* historic filesystem type number */
int vfc_refcount; /* number mounted of this type */
int vfc_flags; /* permanent flags */
+ int vfc_prison_flag; /* prison allow.mount.* flag */
struct vfsoptdecl *vfc_opts; /* mount options */
TAILQ_ENTRY(vfsconf) vfc_list; /* list of vfscons */
};
@@ -851,7 +852,8 @@ vfs_statfs_t __vfs_statfs;
*/
#define VFS_VERSION_00 0x19660120
#define VFS_VERSION_01 0x20121030
-#define VFS_VERSION VFS_VERSION_01
+#define VFS_VERSION_02 0x20180504
+#define VFS_VERSION VFS_VERSION_02
#define VFS_SET(vfsops, fsname, flags) \
static struct vfsconf fsname ## _vfsconf = { \
Modified: head/usr.sbin/jail/jail.8
==============================================================================
--- head/usr.sbin/jail/jail.8 Fri May 4 20:38:26 2018 (r333262)
+++ head/usr.sbin/jail/jail.8 Fri May 4 20:54:27 2018 (r333263)
@@ -25,7 +25,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd June 5, 2017
+.Dd May 4, 2018
.Dt JAIL 8
.Os
.Sh NAME
@@ -545,6 +545,33 @@ is set to a value lower than 2.
The devfs ruleset should be restricted from the default by using the
.Va devfs_ruleset
option.
+.It Va allow.quotas
+The jail root may administer quotas on the jail's filesystem(s).
+This includes filesystems that the jail may share with other jails or
+with non-jailed parts of the system.
+.It Va allow.socket_af
+Sockets within a jail are normally restricted to IPv4, IPv6, local
+(UNIX), and route. This allows access to other protocol stacks that
+have not had jail functionality added to them.
+.It Va allow.reserved_ports
+The jail root may bind to ports lower than 1024.
+.El
+.El
+.Pp
+Kernel modules may add their own parameters, which only exist when the
+module is loaded.
+These are typically headed under a parameter named after the module,
+with values of
+.Dq inherit
+to give the jail full use of the module,
+.Dq new
+to encapsulate the jail in some module-specific way,
+and
+.Dq disable
+to make the module unavailable to the jail.
+There also may be other parameters to define jail behavior within the module.
+Module-specific parameters include:
+.Bl -tag -width indent
.It Va allow.mount.fdescfs
privileged users inside the jail will be able to mount and unmount the
fdescfs file system.
@@ -605,33 +632,6 @@ See
.Xr zfs 8
for information on how to configure the ZFS filesystem to operate from
within a jail.
-.It Va allow.quotas
-The jail root may administer quotas on the jail's filesystem(s).
-This includes filesystems that the jail may share with other jails or
-with non-jailed parts of the system.
-.It Va allow.socket_af
-Sockets within a jail are normally restricted to IPv4, IPv6, local
-(UNIX), and route. This allows access to other protocol stacks that
-have not had jail functionality added to them.
-.It Va allow.reserved_ports
-The jail root may bind to ports lower than 1024.
-.El
-.El
-.Pp
-Kernel modules may add their own parameters, which only exist when the
-module is loaded.
-These are typically headed under a parameter named after the module,
-with values of
-.Dq inherit
-to give the jail full use of the module,
-.Dq new
-to encapsulate the jail in some module-specific way,
-and
-.Dq disable
-to make the module unavailable to the jail.
-There also may be other parameters to define jail behavior within the module.
-Module-specific parameters include:
-.Bl -tag -width indent
.It Va linux
Determine how a jail's Linux emulation environment appears.
A value of
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