/*
* Decide whether it is okay to remove within a sticky directory.
*
* In sticky directories, write access is not sufficient;
* you can remove entries from a directory only if:
*
* you own the directory,
* you own the entry,
* the entry is a plain file and you have write access,
* or you are privileged (checked in secpolicy...).
*
* The function returns 0 if remove access is granted.
*/
int
zfs_sticky_remove_access(znode_t *zdp, znode_t *zp, cred_t *cr)
{
uid_t uid;
uid_t downer;
uid_t fowner;
zfsvfs_t *zfsvfs = ZTOZSB(zdp);
if (zfsvfs->z_replay)
return (0);
if ((zdp->z_mode & S_ISVTX) == 0)
return (0);
downer = zfs_fuid_map_id(zfsvfs, KUID_TO_SUID(ZTOI(zdp)->i_uid),
cr, ZFS_OWNER);
fowner = zfs_fuid_map_id(zfsvfs, KUID_TO_SUID(ZTOI(zp)->i_uid),
cr, ZFS_OWNER);
if ((uid = crgetuid(cr)) == downer || uid == fowner ||
(S_ISDIR(ZTOI(zp)->i_mode) &&
zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr) == 0))
return (0);
else
return (secpolicy_vnode_remove(cr));
}
/*
* 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);
}
}
/*
* Validate that user is allowed to unallow specified permissions. They
* must have the 'allow' permission, and even then can only unallow
* perms for their uid.
*/
int
dsl_deleg_can_unallow(char *ddname, nvlist_t *nvp, cred_t *cr)
{
nvpair_t *whopair = NULL;
int error;
char idstr[32];
if ((error = dsl_deleg_access(ddname, ZFS_DELEG_PERM_ALLOW, cr)) != 0)
return (error);
(void) snprintf(idstr, sizeof (idstr), "%lld",
(longlong_t)crgetuid(cr));
while (whopair = nvlist_next_nvpair(nvp, whopair)) {
zfs_deleg_who_type_t type = nvpair_name(whopair)[0];
if (type != ZFS_DELEG_USER &&
type != ZFS_DELEG_USER_SETS)
return (EPERM);
if (strcmp(idstr, &nvpair_name(whopair)[3]) != 0)
return (EPERM);
}
return (0);
}
uid_t
zfs_fuid_map_id(zfsvfs_t *zfsvfs, uint64_t fuid,
cred_t *cr, zfs_fuid_type_t type)
{
#ifdef HAVE_ZPL
uint32_t index = FUID_INDEX(fuid);
const char *domain;
uid_t id;
if (index == 0)
return (fuid);
domain = zfs_fuid_find_by_idx(zfsvfs, index);
ASSERT(domain != NULL);
if (type == ZFS_OWNER || type == ZFS_ACE_USER) {
(void) kidmap_getuidbysid(crgetzone(cr), domain,
FUID_RID(fuid), &id);
} else {
(void) kidmap_getgidbysid(crgetzone(cr), domain,
FUID_RID(fuid), &id);
}
return (id);
#endif
if(type == ZFS_OWNER || type == ZFS_ACE_USER)
return (crgetuid(cr));
else
return (crgetgid(cr));
}
/*
* Decide whether it is okay to remove within a sticky directory.
*
* In sticky directories, write access is not sufficient;
* you can remove entries from a directory only if:
*
* you own the directory,
* you own the entry,
* the entry is a plain file and you have write access,
* or you are privileged (checked in secpolicy...).
*
* The function returns 0 if remove access is granted.
*/
int
zfs_sticky_remove_access(znode_t *zdp, znode_t *zp, cred_t *cr)
{
#ifdef HAVE_ZPL
uid_t uid;
uid_t downer;
uid_t fowner;
zfsvfs_t *zfsvfs = zdp->z_zfsvfs;
if (zdp->z_zfsvfs->z_replay)
return (0);
if ((zdp->z_mode & S_ISVTX) == 0)
return (0);
downer = zfs_fuid_map_id(zfsvfs, zdp->z_uid, cr, ZFS_OWNER);
fowner = zfs_fuid_map_id(zfsvfs, zp->z_uid, cr, ZFS_OWNER);
if ((uid = crgetuid(cr)) == downer || uid == fowner ||
(ZTOV(zp)->v_type == VREG &&
zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr) == 0))
return (0);
else
return (secpolicy_vnode_remove(cr));
#endif
return 0;
}
/*
* 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);
}
/*
* Write out a history event.
*/
int
spa_history_log(spa_t *spa, const char *history_str, history_log_type_t what)
{
history_arg_t *ha;
int err = 0;
dmu_tx_t *tx;
ASSERT(what != LOG_INTERNAL);
tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir);
err = dmu_tx_assign(tx, TXG_WAIT);
if (err) {
dmu_tx_abort(tx);
return (err);
}
ha = kmem_alloc(sizeof (history_arg_t), KM_SLEEP);
ha->ha_history_str = strdup(history_str);
ha->ha_zone = strdup(spa_history_zone());
ha->ha_log_type = what;
ha->ha_uid = crgetuid(CRED());
/* Kick this off asynchronously; errors are ignored. */
dsl_sync_task_do_nowait(spa_get_dsl(spa), NULL,
spa_history_log_sync, spa, ha, 0, tx);
dmu_tx_commit(tx);
/* spa_history_log_sync will free ha and strings */
return (err);
}
static int
VMBlockOpen(struct vnode **vpp, // IN: Vnode for file to open
int flag, // IN: Open flags
struct cred *cr // IN: Credentials of caller
#if OS_VFS_VERSION >= 5
, caller_context_t *ctx // IN: Caller's context
#endif
)
{
VMBlockMountInfo *mip;
Bool isRoot = TRUE;
Debug(VMBLOCK_ENTRY_LOGLEVEL, "VMBlockOpen: entry\n");
/*
* The opened vnode is held for us, so we don't need to do anything here
* except make sure only root opens the mount point.
*/
mip = VPTOMIP(*vpp);
if (mip->root == *vpp) {
isRoot = crgetuid(cr) == 0;
}
return isRoot ? 0 : EACCES;
}
/*
* Create a file system FUID, based on information in the users cred
*/
uint64_t
zfs_fuid_create_cred(zfsvfs_t *zfsvfs, zfs_fuid_type_t type,
dmu_tx_t *tx, cred_t *cr, zfs_fuid_info_t **fuidp)
{
uint64_t idx;
ksid_t *ksid;
uint32_t rid;
char *kdomain;
const char *domain;
uid_t id;
VERIFY(type == ZFS_OWNER || type == ZFS_GROUP);
if (type == ZFS_OWNER)
id = crgetuid(cr);
else
id = crgetgid(cr);
if (!zfsvfs->z_use_fuids || !IS_EPHEMERAL(id))
return ((uint64_t)id);
ksid = crgetsid(cr, (type == ZFS_OWNER) ? KSID_OWNER : KSID_GROUP);
VERIFY(ksid != NULL);
rid = ksid_getrid(ksid);
domain = ksid_getdomain(ksid);
idx = zfs_fuid_find_by_domain(zfsvfs, domain, &kdomain, tx);
zfs_fuid_node_add(fuidp, kdomain, rid, idx, id, type);
return (FUID_ENCODE(idx, rid));
}
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
zfs_make_xattrdir(znode_t *zp, vattr_t *vap, vnode_t **xvpp, cred_t *cr)
{
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
znode_t *xzp;
dmu_tx_t *tx;
int error;
zfs_fuid_info_t *fuidp = NULL;
*xvpp = NULL;
/*
* In FreeBSD, access checking for creating an EA is being done
* in zfs_setextattr(),
*/
#ifndef __FreeBSD__
if (error = zfs_zaccess(zp, ACE_WRITE_NAMED_ATTRS, 0, B_FALSE, cr))
return (error);
#endif
tx = dmu_tx_create(zfsvfs->z_os);
dmu_tx_hold_bonus(tx, zp->z_id);
dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
if (IS_EPHEMERAL(crgetuid(cr)) || IS_EPHEMERAL(crgetgid(cr))) {
if (zfsvfs->z_fuid_obj == 0) {
dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT);
dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
FUID_SIZE_ESTIMATE(zfsvfs));
dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, FALSE, NULL);
} else {
dmu_tx_hold_bonus(tx, zfsvfs->z_fuid_obj);
dmu_tx_hold_write(tx, zfsvfs->z_fuid_obj, 0,
FUID_SIZE_ESTIMATE(zfsvfs));
}
}
error = dmu_tx_assign(tx, zfsvfs->z_assign);
if (error) {
if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT)
dmu_tx_wait(tx);
dmu_tx_abort(tx);
return (error);
}
zfs_mknode(zp, vap, tx, cr, IS_XATTR, &xzp, 0, NULL, &fuidp);
ASSERT(xzp->z_phys->zp_parent == zp->z_id);
dmu_buf_will_dirty(zp->z_dbuf, tx);
zp->z_phys->zp_xattr = xzp->z_id;
(void) zfs_log_create(zfsvfs->z_log, tx, TX_MKXATTR, zp,
xzp, "", NULL, fuidp, vap);
if (fuidp)
zfs_fuid_info_free(fuidp);
dmu_tx_commit(tx);
*xvpp = ZTOV(xzp);
return (0);
}
static void
smb_tree_set_execsub_info(smb_tree_t *tree, smb_execsub_info_t *subs)
{
subs->e_winname = tree->t_user->u_name;
subs->e_userdom = tree->t_user->u_domain;
subs->e_srv_ipaddr = tree->t_session->local_ipaddr;
subs->e_cli_ipaddr = tree->t_session->ipaddr;
subs->e_cli_netbiosname = tree->t_session->workstation;
subs->e_uid = crgetuid(tree->t_user->u_cred);
}
int /* ERRNO if error, 0 if successful. */
sam_access_ino(
sam_node_t *ip, /* pointer to inode. */
int mode, /* mode of access to be verified */
boolean_t locked, /* is ip->inode_rwl held by caller? */
cred_t *credp) /* credentials pointer. */
{
int shift = 0;
ASSERT(!locked || RW_LOCK_HELD(&ip->inode_rwl));
/*
* If requesting write access, and read only filesystem or WORM file
* return error.
*/
if (mode & S_IWRITE) {
if (ip->mp->mt.fi_mflag & MS_RDONLY) {
return (EROFS);
}
if (ip->di.status.b.worm_rdonly && !S_ISDIR(ip->di.mode)) {
return (EROFS);
}
}
if (!locked) {
RW_LOCK_OS(&ip->inode_rwl, RW_READER);
}
/* Use ACL, if present, to check access. */
if (ip->di.status.b.acl) {
int error;
error = sam_acl_access(ip, mode, credp);
if (!locked) {
RW_UNLOCK_OS(&ip->inode_rwl, RW_READER);
}
return (error);
}
if (!locked) {
RW_UNLOCK_OS(&ip->inode_rwl, RW_READER);
}
if (crgetuid(credp) != ip->di.uid) {
shift += 3;
if (!groupmember((uid_t)ip->di.gid, credp)) {
shift += 3;
}
}
mode &= ~(ip->di.mode << shift);
if (mode == 0) {
return (0);
}
return (secpolicy_vnode_access(credp, SAM_ITOV(ip), ip->di.uid, mode));
}
int /* ERRNO if error, 0 if successful. */
sam_access_ino(
sam_node_t *ip, /* pointer to inode. */
int mode, /* mode of access to be verified, */
/* owner position. */
boolean_t locked, /* is ip->inode_rwl held by caller? */
cred_t *credp) /* credentials pointer. */
{
ASSERT(!locked);
/*
* If requesting write access, and read only filesystem or WORM file
* return error.
*/
if (mode & S_IWRITE) {
if (ip->mp->mt.fi_mflag & MS_RDONLY) {
return (EROFS);
}
if (ip->di.status.b.worm_rdonly && !S_ISDIR(ip->di.mode)) {
return (EROFS);
}
}
if (crgetuid(credp) == 0) {
return (0); /* all accesses allowed for root */
}
if (crgetuid(credp) != ip->di.uid) {
/*
* caller not owner, check group
*/
mode >>= 3;
if (!in_group_p(ip->di.gid)) {
/*
* caller not in group, check other
*/
mode >>= 3;
}
/*
* find_ids(packet, mp)
*
* attempt to discern the uid and projid of the originator of a packet by
* looking at the dblks making up the packet - yeuch!
*
* We do it by skipping any fragments with a credp of NULL (originated in
* kernel), taking the first value that isn't NULL to be the credp for the
* whole packet. We also suck the projid from the same fragment.
*/
static void
find_ids(ipgpc_packet_t *packet, mblk_t *mp)
{
cred_t *cr;
cr = msg_getcred(mp, NULL);
if (cr != NULL) {
packet->uid = crgetuid(cr);
packet->projid = crgetprojid(cr);
} else {
packet->uid = (uid_t)-1;
packet->projid = -1;
}
}
int
tmp_sticky_remove_access(struct tmpnode *dir, struct tmpnode *entry,
struct cred *cr)
{
uid_t uid = crgetuid(cr);
if ((dir->tn_mode & S_ISVTX) &&
uid != dir->tn_uid &&
uid != entry->tn_uid &&
(entry->tn_type != VREG ||
tmp_taccess(entry, VWRITE, cr) != 0))
return (secpolicy_vnode_remove(cr));
return (0);
}
/*ARGSUSED*/
static int
bootfs_access(vnode_t *vp, int mode, int flags, cred_t *cr,
caller_context_t *ct)
{
int shift = 0;
bootfs_node_t *bpn = (bootfs_node_t *)vp->v_data;
if (crgetuid(cr) != bpn->bvn_attr.va_uid) {
shift += 3;
if (groupmember(bpn->bvn_attr.va_gid, cr) == 0)
shift += 3;
}
return (secpolicy_vnode_access2(cr, vp, bpn->bvn_attr.va_uid,
bpn->bvn_attr.va_mode << shift, mode));
}
/*
* Standard access() like check. Figure out which mode bits apply
* to the caller then pass the missing mode bits to the secpolicy function.
*/
static int
nm_access_unlocked(void *vnp, int mode, cred_t *crp)
{
struct namenode *nodep = vnp;
int shift = 0;
if (crgetuid(crp) != nodep->nm_vattr.va_uid) {
shift += 3;
if (!groupmember(nodep->nm_vattr.va_gid, crp))
shift += 3;
}
return (secpolicy_vnode_access2(crp, NMTOV(nodep),
nodep->nm_vattr.va_uid, nodep->nm_vattr.va_mode << shift,
mode));
}
int
zfs_create_share_dir(zfs_sb_t *zsb, dmu_tx_t *tx)
{
#ifdef HAVE_SMB_SHARE
zfs_acl_ids_t acl_ids;
vattr_t vattr;
znode_t *sharezp;
vnode_t *vp;
znode_t *zp;
int error;
vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE;
vattr.va_mode = S_IFDIR | 0555;
vattr.va_uid = crgetuid(kcred);
vattr.va_gid = crgetgid(kcred);
sharezp = kmem_cache_alloc(znode_cache, KM_SLEEP);
sharezp->z_moved = 0;
sharezp->z_unlinked = 0;
sharezp->z_atime_dirty = 0;
sharezp->z_zfsvfs = zfsvfs;
sharezp->z_is_sa = zfsvfs->z_use_sa;
vp = ZTOV(sharezp);
vn_reinit(vp);
vp->v_type = VDIR;
VERIFY(0 == zfs_acl_ids_create(sharezp, IS_ROOT_NODE, &vattr,
kcred, NULL, &acl_ids));
zfs_mknode(sharezp, &vattr, tx, kcred, IS_ROOT_NODE, &zp, &acl_ids);
ASSERT3P(zp, ==, sharezp);
ASSERT(!vn_in_dnlc(ZTOV(sharezp))); /* not valid to move */
POINTER_INVALIDATE(&sharezp->z_zfsvfs);
error = zap_add(zfsvfs->z_os, MASTER_NODE_OBJ,
ZFS_SHARES_DIR, 8, 1, &sharezp->z_id, tx);
zfsvfs->z_shares_dir = sharezp->z_id;
zfs_acl_ids_free(&acl_ids);
// ZTOV(sharezp)->v_count = 0;
sa_handle_destroy(sharezp->z_sa_hdl);
kmem_cache_free(znode_cache, sharezp);
return (error);
#else
return (0);
#endif /* HAVE_SMB_SHARE */
}
/*
* Decide whether it is okay to remove within a sticky directory.
*
* In sticky directories, write access is not sufficient;
* you can remove entries from a directory only if:
*
* you own the directory,
* you own the entry,
* the entry is a plain file and you have write access,
* or you are privileged (checked in secpolicy...).
*
* The function returns 0 if remove access is granted.
*/
int
zfs_sticky_remove_access(znode_t *zdp, znode_t *zp, cred_t *cr)
{
uid_t uid;
if (zdp->z_zfsvfs->z_assign >= TXG_INITIAL) /* ZIL replay */
return (0);
if ((zdp->z_phys->zp_mode & S_ISVTX) == 0 ||
(uid = crgetuid(cr)) == zdp->z_phys->zp_uid ||
uid == zp->z_phys->zp_uid ||
(ZTOV(zp)->v_type == VREG &&
zfs_zaccess(zp, ACE_WRITE_DATA, cr) == 0))
return (0);
else
return (secpolicy_vnode_remove(cr));
}
/*
* Create a file system FUID, based on information in the users cred
*
* If cred contains KSID_OWNER then it should be used to determine
* the uid otherwise cred's uid will be used. By default cred's gid
* is used unless it's an ephemeral ID in which case KSID_GROUP will
* be used if it exists.
*/
uint64_t
zfs_fuid_create_cred(zfsvfs_t *zfsvfs, zfs_fuid_type_t type,
cred_t *cr, zfs_fuid_info_t **fuidp)
{
uint64_t idx;
ksid_t *ksid;
uint32_t rid;
char *kdomain;
const char *domain;
uid_t id;
VERIFY(type == ZFS_OWNER || type == ZFS_GROUP);
ksid = crgetsid(cr, (type == ZFS_OWNER) ? KSID_OWNER : KSID_GROUP);
if (!zfsvfs->z_use_fuids || (ksid == NULL)) {
id = (type == ZFS_OWNER) ? crgetuid(cr) : crgetgid(cr);
if (IS_EPHEMERAL(id))
return ((type == ZFS_OWNER) ? UID_NOBODY : GID_NOBODY);
return ((uint64_t)id);
}
/*
* ksid is present and FUID is supported
*/
id = (type == ZFS_OWNER) ? ksid_getid(ksid) : crgetgid(cr);
if (!IS_EPHEMERAL(id))
return ((uint64_t)id);
if (type == ZFS_GROUP)
id = ksid_getid(ksid);
rid = ksid_getrid(ksid);
domain = ksid_getdomain(ksid);
idx = zfs_fuid_find_by_domain(zfsvfs, domain, &kdomain, B_TRUE);
zfs_fuid_node_add(fuidp, kdomain, rid, idx, id, type);
return (FUID_ENCODE(idx, rid));
}
/*
* 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;
}
/* ARGSUSED */
static int
auto_access(
vnode_t *vp,
int mode,
int flags,
cred_t *cred,
caller_context_t *ct)
{
fnnode_t *fnp = vntofn(vp);
vnode_t *newvp;
int error;
AUTOFS_DPRINT((4, "auto_access: vp=%p\n", (void *)vp));
if (error = auto_trigger_mount(vp, cred, &newvp))
goto done;
if (newvp != NULL) {
/*
* Node is mounted on.
*/
error = VOP_ACCESS(newvp, mode, 0, cred, ct);
VN_RELE(newvp);
} else {
int shift = 0;
/*
* really interested in the autofs node, check the
* access on it
*/
ASSERT(error == 0);
if (crgetuid(cred) != fnp->fn_uid) {
shift += 3;
if (groupmember(fnp->fn_gid, cred) == 0)
shift += 3;
}
error = secpolicy_vnode_access2(cred, vp, fnp->fn_uid,
fnp->fn_mode << shift, mode);
}
done:
AUTOFS_DPRINT((5, "auto_access: error=%d\n", error));
return (error);
}
/*
* set all create time permission on new dataset.
*/
void
dsl_deleg_set_create_perms(dsl_dir_t *sdd, dmu_tx_t *tx, cred_t *cr)
{
dsl_dir_t *dd;
uint64_t uid = crgetuid(cr);
if (spa_version(dmu_objset_spa(sdd->dd_pool->dp_meta_objset)) <
SPA_VERSION_DELEGATED_PERMS)
return;
for (dd = sdd->dd_parent; dd != NULL; dd = dd->dd_parent) {
uint64_t pzapobj = dd->dd_phys->dd_deleg_zapobj;
if (pzapobj == 0)
continue;
copy_create_perms(sdd, pzapobj, B_FALSE, uid, tx);
copy_create_perms(sdd, pzapobj, B_TRUE, uid, tx);
}
}
/*
*
* 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);
}
/*
* This function is used for secpolicy_setattr(). It must call an
* access() like function while it is already holding the
* dv_contents lock. We only care about this when dv_attr != NULL;
* so the unlocked access call only concerns itself with that
* particular branch of devfs_access().
*/
static int
devfs_unlocked_access(void *vdv, int mode, struct cred *cr)
{
struct dv_node *dv = vdv;
int shift = 0;
uid_t owner = dv->dv_attr->va_uid;
/* Check access based on owner, group and public permissions. */
if (crgetuid(cr) != owner) {
shift += 3;
if (groupmember(dv->dv_attr->va_gid, cr) == 0)
shift += 3;
}
/* compute missing mode bits */
mode &= ~(dv->dv_attr->va_mode << shift);
if (mode == 0)
return (0);
return (secpolicy_vnode_access(cr, DVTOV(dv), owner, mode));
}
int
tmp_taccess(void *vtp, int mode, struct cred *cred)
{
struct tmpnode *tp = vtp;
int shift = 0;
/*
* Check access based on owner, group and
* public permissions in tmpnode.
*/
if (crgetuid(cred) != tp->tn_uid) {
shift += MODESHIFT;
if (groupmember(tp->tn_gid, cred) == 0)
shift += MODESHIFT;
}
/* compute missing mode bits */
mode &= ~(tp->tn_mode << shift);
if (mode == 0)
return (0);
return (secpolicy_vnode_access(cred, TNTOV(tp), tp->tn_uid, mode));
}
/*
* Decide whether it is okay to remove within a sticky directory.
*
* In sticky directories, write access is not sufficient;
* you can remove entries from a directory only if:
*
* you own the directory,
* you own the entry,
* the entry is a plain file and you have write access,
* or you are privileged (checked in secpolicy...).
*
* The function returns 0 if remove access is granted.
*/
int
zfs_sticky_remove_access(znode_t *zdp, znode_t *zp, cred_t *cr)
{
uid_t uid;
if (zdp->z_zfsvfs->z_assign >= TXG_INITIAL) /* ZIL replay */
return (0);
if ((zdp->z_mode & S_ISVTX) == 0 ||
(uid = crgetuid(cr)) == zdp->z_uid ||
uid == zp->z_uid ||
(
#ifdef __APPLE__
vnode_isreg(ZTOV(zp)) &&
#else
ZTOV(zp)->v_type == VREG &&
#endif
zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr) == 0)
)
return (0);
else
return (secpolicy_vnode_remove(cr));
}
static int
xmem_link(struct vnode *dvp, struct vnode *srcvp, char *tnm, struct cred *cred)
{
struct xmemnode *parent;
struct xmemnode *from;
struct xmount *xm = (struct xmount *)VTOXM(dvp);
int error;
struct xmemnode *found = NULL;
struct vnode *realvp;
if (VOP_REALVP(srcvp, &realvp) == 0)
srcvp = realvp;
parent = (struct xmemnode *)VTOXN(dvp);
from = (struct xmemnode *)VTOXN(srcvp);
if ((srcvp->v_type == VDIR &&
secpolicy_fs_linkdir(cred, dvp->v_vfsp) != 0) ||
(from->xn_uid != crgetuid(cred) && secpolicy_basic_link(cred) != 0))
return (EPERM);
error = xdirlookup(parent, tnm, &found, cred);
if (error == 0) {
ASSERT(found);
xmemnode_rele(found);
return (EEXIST);
}
if (error != ENOENT)
return (error);
rw_enter(&parent->xn_rwlock, RW_WRITER);
error = xdirenter(xm, parent, tnm, DE_LINK, (struct xmemnode *)NULL,
from, NULL, (struct xmemnode **)NULL, cred);
rw_exit(&parent->xn_rwlock);
return (error);
}
