/*
* Load all permissions user based on cred belongs to.
*/
static void
dsl_load_user_sets(objset_t *mos, uint64_t zapobj, avl_tree_t *avl,
char checkflag, cred_t *cr)
{
const gid_t *gids;
int ngids, i;
uint64_t id;
id = crgetuid(cr);
(void) dsl_load_sets(mos, zapobj,
ZFS_DELEG_USER_SETS, checkflag, &id, avl);
id = crgetgid(cr);
(void) dsl_load_sets(mos, zapobj,
ZFS_DELEG_GROUP_SETS, checkflag, &id, avl);
(void) dsl_load_sets(mos, zapobj,
ZFS_DELEG_EVERYONE_SETS, checkflag, NULL, avl);
ngids = crgetngroups(cr);
gids = crgetgroups(cr);
for (i = 0; i != ngids; i++) {
id = gids[i];
(void) dsl_load_sets(mos, zapobj,
ZFS_DELEG_GROUP_SETS, checkflag, &id, avl);
}
}
/*
* XDR loopback unix auth parameters.
* NOTE: this is an XDR_ENCODE only routine.
*/
bool_t
xdr_authloopback(XDR *xdrs)
{
uid_t uid;
gid_t gid;
int len;
caddr_t groups;
char *name = uts_nodename();
struct cred *cr;
time_t now;
if (xdrs->x_op != XDR_ENCODE)
return (FALSE);
cr = CRED();
uid = crgetuid(cr);
gid = crgetgid(cr);
len = crgetngroups(cr);
groups = (caddr_t)crgetgroups(cr);
now = gethrestime_sec();
if (xdr_uint32(xdrs, (uint32_t *)&now) &&
xdr_string(xdrs, &name, MAX_MACHINE_NAME) &&
xdr_uid_t(xdrs, &uid) &&
xdr_gid_t(xdrs, &gid) &&
xdr_array(xdrs, &groups, (uint_t *)&len, NGRPS_LOOPBACK,
sizeof (int), (xdrproc_t)xdr_int))
return (TRUE);
return (FALSE);
}
static int
splat_cred_test1(struct file *file, void *arg)
{
char str[GROUP_STR_SIZE];
uid_t uid, ruid, suid;
gid_t gid, rgid, sgid, *groups;
int ngroups, i, count = 0;
uid = crgetuid(CRED());
ruid = crgetruid(CRED());
suid = crgetsuid(CRED());
gid = crgetgid(CRED());
rgid = crgetrgid(CRED());
sgid = crgetsgid(CRED());
crhold(CRED());
ngroups = crgetngroups(CRED());
groups = crgetgroups(CRED());
memset(str, 0, GROUP_STR_SIZE);
for (i = 0; i < ngroups; i++) {
count += sprintf(str + count, "%d ", groups[i]);
if (count > (GROUP_STR_SIZE - GROUP_STR_REDZONE)) {
splat_vprint(file, SPLAT_CRED_TEST1_NAME,
"Failed too many group entries for temp "
"buffer: %d, %s\n", ngroups, str);
return -ENOSPC;
}
}
crfree(CRED());
splat_vprint(file, SPLAT_CRED_TEST1_NAME,
"uid: %d ruid: %d suid: %d "
"gid: %d rgid: %d sgid: %d\n",
uid, ruid, suid, gid, rgid, sgid);
splat_vprint(file, SPLAT_CRED_TEST1_NAME,
"ngroups: %d groups: %s\n", ngroups, str);
if (uid || ruid || suid || gid || rgid || sgid) {
splat_vprint(file, SPLAT_CRED_TEST1_NAME,
"Failed expected all uids+gids to be %d\n", 0);
return -EIDRM;
}
if (ngroups > NGROUPS_MAX) {
splat_vprint(file, SPLAT_CRED_TEST1_NAME,
"Failed ngroups must not exceed NGROUPS_MAX: "
"%d > %d\n", ngroups, NGROUPS_MAX);
return -EIDRM;
}
splat_vprint(file, SPLAT_CRED_TEST1_NAME,
"Success sane CRED(): %d\n", 0);
return 0;
} /* splat_cred_test1() */
int
getgroups(int gidsetsize, gid_t *gidset)
{
struct cred *cr;
int n;
cr = curthread->t_cred;
n = crgetngroups(cr);
if (gidsetsize != 0) {
if (gidsetsize < n)
return (set_errno(EINVAL));
if (copyout(crgetgroups(cr), gidset, n * sizeof (gid_t)))
return (set_errno(EFAULT));
}
return (n);
}
/*
* check a specified user/group for a requested permission
*/
static int
dsl_check_user_access(objset_t *mos, uint64_t zapobj, const char *perm,
int checkflag, cred_t *cr)
{
//const gid_t *gids;
// int ngids;
//int i;
uint64_t id;
/* check for user */
id = crgetuid(cr);
if (dsl_check_access(mos, zapobj,
ZFS_DELEG_USER, checkflag, &id, perm) == 0)
return (0);
/* check for users primary group */
id = crgetgid(cr);
if (dsl_check_access(mos, zapobj,
ZFS_DELEG_GROUP, checkflag, &id, perm) == 0)
return (0);
/* check for everyone entry */
id = -1;
if (dsl_check_access(mos, zapobj,
ZFS_DELEG_EVERYONE, checkflag, &id, perm) == 0)
return (0);
/* check each supplemental group user is a member of */
/*XXX NOEL: get kauth equivs for the below, crgetngroups, crgetgroups*/
#ifndef __APPLE__
ngids = crgetngroups(cr);
gids = crgetgroups(cr);
for (i = 0; i != ngids; i++) {
id = gids[i];
if (dsl_check_access(mos, zapobj,
ZFS_DELEG_GROUP, checkflag, &id, perm) == 0)
return (0);
}
return (EPERM);
#endif
return 0;
}
/*
*
* Cachefs used to know too much about how creds looked; since it's
* committed to persistent storage, we can't change the layout so
* it now has a "dl_cred_t" which (unsurprisingly) looks exactly like
* an old credential.
*
* The dst argument needs to point to:
* struct dl_cred_t;
* <buffer space> buffer for groups
*
* The source is a proper kernel cred_t.
*
*/
static size_t
copy_cred(cred_t *src, dl_cred_t *dst)
{
int n;
const gid_t *sgrp = crgetgroups(src);
n = MIN(NGROUPS_MAX_DEFAULT, crgetngroups(src));
/* copy the fixed fields */
dst->cr_uid = crgetuid(src);
dst->cr_ruid = crgetruid(src);
dst->cr_suid = crgetsuid(src);
dst->cr_gid = crgetgid(src);
dst->cr_rgid = crgetrgid(src);
dst->cr_sgid = crgetsgid(src);
dst->cr_groups[0] = sgrp[0];
dst->cr_ngroups = n;
bcopy(sgrp, (void *)(dst + 1), (n - 1) * sizeof (gid_t));
return (sizeof (dl_cred_t) + (n - 1) * sizeof (gid_t));
}
/*
* check a specified user/group for a requested permission
*/
static int
dsl_check_user_access(objset_t *mos, uint64_t zapobj, const char *perm,
int checkflag, cred_t *cr)
{
const gid_t *gids;
int ngids;
int i;
uint64_t id;
/* check for user */
id = crgetuid(cr);
if (dsl_check_access(mos, zapobj,
ZFS_DELEG_USER, checkflag, &id, perm) == 0)
return (0);
/* check for users primary group */
id = crgetgid(cr);
if (dsl_check_access(mos, zapobj,
ZFS_DELEG_GROUP, checkflag, &id, perm) == 0)
return (0);
/* check for everyone entry */
id = -1;
if (dsl_check_access(mos, zapobj,
ZFS_DELEG_EVERYONE, checkflag, &id, perm) == 0)
return (0);
/* check each supplemental group user is a member of */
ngids = crgetngroups(cr);
gids = crgetgroups(cr);
for (i = 0; i != ngids; i++) {
id = gids[i];
if (dsl_check_access(mos, zapobj,
ZFS_DELEG_GROUP, checkflag, &id, perm) == 0)
return (0);
}
return (EPERM);
}
static bool_t
authkern_marshal(AUTH *auth, XDR *xdrs, struct cred *cr)
{
char *sercred;
XDR xdrm;
struct opaque_auth *cred;
bool_t ret = FALSE;
const gid_t *gp, *gpend;
int gidlen, credsize, namelen, rounded_namelen;
int32_t *ptr;
char *nodename = uts_nodename();
/*
* First we try a fast path to get through
* this very common operation.
*/
gp = crgetgroups(cr);
gidlen = crgetngroups(cr);
if (gidlen > NGRPS)
gidlen = NGRPS;
gpend = &gp[gidlen-1];
namelen = (int)strlen(nodename);
rounded_namelen = RNDUP(namelen);
credsize = 4 + 4 + rounded_namelen + 4 + 4 + 4 + gidlen * 4;
ptr = XDR_INLINE(xdrs, 4 + 4 + credsize + 4 + 4);
if (ptr) {
/*
* We can do the fast path.
*/
IXDR_PUT_INT32(ptr, AUTH_UNIX); /* cred flavor */
IXDR_PUT_INT32(ptr, credsize); /* cred len */
IXDR_PUT_INT32(ptr, gethrestime_sec());
IXDR_PUT_INT32(ptr, namelen);
bcopy(nodename, (caddr_t)ptr, namelen);
if (rounded_namelen - namelen)
bzero(((caddr_t)ptr) + namelen,
rounded_namelen - namelen);
ptr += rounded_namelen / BYTES_PER_XDR_UNIT;
IXDR_PUT_INT32(ptr, crgetuid(cr));
IXDR_PUT_INT32(ptr, crgetgid(cr));
IXDR_PUT_INT32(ptr, gidlen);
while (gp <= gpend) {
IXDR_PUT_INT32(ptr, *gp++);
}
IXDR_PUT_INT32(ptr, AUTH_NULL); /* verf flavor */
IXDR_PUT_INT32(ptr, 0); /* verf len */
return (TRUE);
}
sercred = kmem_alloc(MAX_AUTH_BYTES, KM_SLEEP);
/*
* serialize u struct stuff into sercred
*/
xdrmem_create(&xdrm, sercred, MAX_AUTH_BYTES, XDR_ENCODE);
if (!xdr_authkern(&xdrm)) {
printf("authkern_marshal: xdr_authkern failed\n");
ret = FALSE;
goto done;
}
/*
* Make opaque auth credentials that point at serialized u struct
*/
cred = &(auth->ah_cred);
cred->oa_length = XDR_GETPOS(&xdrm);
cred->oa_base = sercred;
/*
* serialize credentials and verifiers (null)
*/
if ((xdr_opaque_auth(xdrs, &(auth->ah_cred))) &&
(xdr_opaque_auth(xdrs, &(auth->ah_verf))))
ret = TRUE;
else
ret = FALSE;
done:
kmem_free(sercred, MAX_AUTH_BYTES);
return (ret);
}
/*
* Callup to the mountd to get access information in the kernel.
*/
static bool_t
nfsauth_retrieve(struct exportinfo *exi, char *req_netid, int flavor,
struct netbuf *addr, int *access, cred_t *clnt_cred, uid_t *srv_uid,
gid_t *srv_gid, uint_t *srv_gids_cnt, gid_t **srv_gids)
{
varg_t varg = {0};
nfsauth_res_t res = {0};
XDR xdrs;
size_t absz;
caddr_t abuf;
int last = 0;
door_arg_t da;
door_info_t di;
door_handle_t dh;
uint_t ntries = 0;
/*
* No entry in the cache for this client/flavor
* so we need to call the nfsauth service in the
* mount daemon.
*/
varg.vers = V_PROTO;
varg.arg_u.arg.cmd = NFSAUTH_ACCESS;
varg.arg_u.arg.areq.req_client.n_len = addr->len;
varg.arg_u.arg.areq.req_client.n_bytes = addr->buf;
varg.arg_u.arg.areq.req_netid = req_netid;
varg.arg_u.arg.areq.req_path = exi->exi_export.ex_path;
varg.arg_u.arg.areq.req_flavor = flavor;
varg.arg_u.arg.areq.req_clnt_uid = crgetuid(clnt_cred);
varg.arg_u.arg.areq.req_clnt_gid = crgetgid(clnt_cred);
varg.arg_u.arg.areq.req_clnt_gids.len = crgetngroups(clnt_cred);
varg.arg_u.arg.areq.req_clnt_gids.val = (gid_t *)crgetgroups(clnt_cred);
DTRACE_PROBE1(nfsserv__func__nfsauth__varg, varg_t *, &varg);
/*
* Setup the XDR stream for encoding the arguments. Notice that
* in addition to the args having variable fields (req_netid and
* req_path), the argument data structure is itself versioned,
* so we need to make sure we can size the arguments buffer
* appropriately to encode all the args. If we can't get sizing
* info _or_ properly encode the arguments, there's really no
* point in continuting, so we fail the request.
*/
if ((absz = xdr_sizeof(xdr_varg, &varg)) == 0) {
*access = NFSAUTH_DENIED;
return (FALSE);
}
abuf = (caddr_t)kmem_alloc(absz, KM_SLEEP);
xdrmem_create(&xdrs, abuf, absz, XDR_ENCODE);
if (!xdr_varg(&xdrs, &varg)) {
XDR_DESTROY(&xdrs);
goto fail;
}
XDR_DESTROY(&xdrs);
/*
* Prepare the door arguments
*
* We don't know the size of the message the daemon
* will pass back to us. By setting rbuf to NULL,
* we force the door code to allocate a buf of the
* appropriate size. We must set rsize > 0, however,
* else the door code acts as if no response was
* expected and doesn't pass the data to us.
*/
da.data_ptr = (char *)abuf;
da.data_size = absz;
da.desc_ptr = NULL;
da.desc_num = 0;
da.rbuf = NULL;
da.rsize = 1;
retry:
mutex_enter(&mountd_lock);
dh = mountd_dh;
if (dh != NULL)
door_ki_hold(dh);
mutex_exit(&mountd_lock);
if (dh == NULL) {
/*
* The rendezvous point has not been established yet!
* This could mean that either mountd(1m) has not yet
* been started or that _this_ routine nuked the door
* handle after receiving an EINTR for a REVOKED door.
*
* Returning NFSAUTH_DROP will cause the NFS client
* to retransmit the request, so let's try to be more
* rescillient and attempt for ntries before we bail.
*/
if (++ntries % NFSAUTH_DR_TRYCNT) {
delay(hz);
goto retry;
}
kmem_free(abuf, absz);
sys_log("nfsauth: mountd has not established door");
*access = NFSAUTH_DROP;
return (FALSE);
}
ntries = 0;
/*
* Now that we've got what we need, place the call.
*/
switch (door_ki_upcall_limited(dh, &da, NULL, SIZE_MAX, 0)) {
case 0: /* Success */
door_ki_rele(dh);
if (da.data_ptr == NULL && da.data_size == 0) {
/*
* The door_return that contained the data
* failed! We're here because of the 2nd
* door_return (w/o data) such that we can
* get control of the thread (and exit
* gracefully).
*/
DTRACE_PROBE1(nfsserv__func__nfsauth__door__nil,
door_arg_t *, &da);
goto fail;
}
break;
case EAGAIN:
/*
* Server out of resources; back off for a bit
*/
door_ki_rele(dh);
delay(hz);
goto retry;
/* NOTREACHED */
case EINTR:
if (!door_ki_info(dh, &di)) {
door_ki_rele(dh);
if (di.di_attributes & DOOR_REVOKED) {
/*
* The server barfed and revoked
* the (existing) door on us; we
* want to wait to give smf(5) a
* chance to restart mountd(1m)
* and establish a new door handle.
*/
mutex_enter(&mountd_lock);
if (dh == mountd_dh) {
door_ki_rele(mountd_dh);
mountd_dh = NULL;
}
mutex_exit(&mountd_lock);
delay(hz);
goto retry;
}
/*
* If the door was _not_ revoked on us,
* then more than likely we took an INTR,
* so we need to fail the operation.
*/
goto fail;
}
/*
* The only failure that can occur from getting
* the door info is EINVAL, so we let the code
* below handle it.
*/
/* FALLTHROUGH */
case EBADF:
case EINVAL:
default:
/*
* If we have a stale door handle, give smf a last
* chance to start it by sleeping for a little bit.
* If we're still hosed, we'll fail the call.
*
* Since we're going to reacquire the door handle
* upon the retry, we opt to sleep for a bit and
* _not_ to clear mountd_dh. If mountd restarted
* and was able to set mountd_dh, we should see
* the new instance; if not, we won't get caught
* up in the retry/DELAY loop.
*/
door_ki_rele(dh);
if (!last) {
delay(hz);
last++;
goto retry;
}
sys_log("nfsauth: stale mountd door handle");
goto fail;
}
