#! /usr/bin/python2.6
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# Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
#
"""This module implements the "zfs allow" and "zfs unallow" subcommands.
The only public interface is the zfs.allow.do_allow() function."""
import zfs.util
import zfs.dataset
import sys
import pwd
import grp
import errno
_ = zfs.util._
class FSPerms(object):
"""This class represents all the permissions that are set on a
particular filesystem (not including those inherited)."""
__slots__ = "create", "sets", "local", "descend", "ld"
__repr__ = zfs.util.default_repr
def __init__(self, raw):
"""Create a FSPerms based on the dict of raw permissions
from zfs.ioctl.get_fsacl()."""
# set of perms
self.create = set()
# below are { "Ntype name": set(perms) }
# where N is a number that we just use for sorting,
# type is "user", "group", "everyone", or "" (for sets)
# name is a user, group, or set name, or "" (for everyone)
self.sets = dict()
self.local = dict()
self.descend = dict()
self.ld = dict()
# see the comment in dsl_deleg.c for the definition of whokey
for whokey in raw.keys():
perms = raw[whokey].keys()
whotypechr = whokey[0].lower()
ws = whokey[3:]
if whotypechr == "c":
self.create.update(perms)
elif whotypechr == "s":
nwho = "1" + ws
self.sets.setdefault(nwho, set()).update(perms)
else:
if whotypechr == "u":
try:
name = pwd.getpwuid(int(ws)).pw_name
except KeyError:
name = ws
nwho = "1user " + name
elif whotypechr == "g":
try:
name = grp.getgrgid(int(ws)).gr_name
except KeyError:
name = ws
nwho = "2group " + name
elif whotypechr == "e":
nwho = "3everyone"
else:
raise ValueError(whotypechr)
if whokey[1] == "l":
d = self.local
elif whokey[1] == "d":
d = self.descend
else:
raise ValueError(whokey[1])
d.setdefault(nwho, set()).update(perms)
# Find perms that are in both local and descend, and
# move them to ld.
for nwho in self.local:
if nwho not in self.descend:
continue
# note: these are set operations
self.ld[nwho] = self.local[nwho] & self.descend[nwho]
self.local[nwho] -= self.ld[nwho]
self.descend[nwho] -= self.ld[nwho]
@staticmethod
def __ldstr(d, header):
s = ""
for (nwho, perms) in sorted(d.items()):
# local and descend may have entries where perms
# is an empty set, due to consolidating all
# permissions into ld
if perms:
s += "\t%s %s\n" % \
(nwho[1:], ",".join(sorted(perms)))
if s:
s = header + s
return s
def __str__(self):
s = self.__ldstr(self.sets, _("Permission sets:\n"))
if self.create:
s += _("Create time permissions:\n")
s += "\t%s\n" % ",".join(sorted(self.create))
s += self.__ldstr(self.local, _("Local permissions:\n"))
s += self.__ldstr(self.descend, _("Descendent permissions:\n"))
s += self.__ldstr(self.ld, _("Local+Descendent permissions:\n"))
return s.rstrip()
def args_to_perms(parser, options, who, perms):
"""Return a dict of raw perms {"whostr" -> {"perm" -> None}}
based on the command-line input."""
# perms is not set if we are doing a "zfs unallow <who> <fs>" to
# remove all of someone's permissions
if perms:
setperms = dict(((p, None) for p in perms if p[0] == "@"))
baseperms = dict(((canonicalized_perm(p), None)
for p in perms if p[0] != "@"))
else:
setperms = None
baseperms = None
d = dict()
def storeperm(typechr, inheritchr, arg):
assert typechr in "ugecs"
assert inheritchr in "ld-"
def mkwhokey(t):
return "%c%c$%s" % (t, inheritchr, arg)
if baseperms or not perms:
d[mkwhokey(typechr)] = baseperms
if setperms or not perms:
d[mkwhokey(typechr.upper())] = setperms
def decodeid(w, toidfunc, fmt):
try:
return int(w)
except ValueError:
try:
return toidfunc(w)[2]
except KeyError:
parser.error(fmt % w)
if options.set:
storeperm("s", "-", who)
elif options.create:
storeperm("c", "-", "")
else:
for w in who:
if options.user:
id = decodeid(w, pwd.getpwnam,
_("invalid user %s"))
typechr = "u"
elif options.group:
id = decodeid(w, grp.getgrnam,
_("invalid group %s"))
typechr = "g"
elif w == "everyone":
id = ""
typechr = "e"
else:
try:
id = pwd.getpwnam(w)[2]
typechr = "u"
except KeyError:
try:
id = grp.getgrnam(w)[2]
typechr = "g"
except KeyError:
parser.error(_("invalid user/group %s") % w)
if options.local:
storeperm(typechr, "l", id)
if options.descend:
storeperm(typechr, "d", id)
return d
perms_subcmd = dict(
create=_("Must also have the 'mount' ability"),
destroy=_("Must also have the 'mount' ability"),
snapshot=_("Allows taking of snapshots"),
rollback=_("Allows rolling back datasets to previously-taken snapshots"),
clone=_("""Must also have the 'create' ability and 'mount'
\t\t\t\tability in the origin file system"""),
promote=_("""Must also have the 'mount'
\t\t\t\tand 'promote' ability in the origin file system"""),
rename=_("""Must also have the 'mount' and 'create'
\t\t\t\tability in the new parent"""),
receive=_("Must also have the 'mount' and 'create' ability"),
allow=_("Must also have the permission that is being\n\t\t\t\tallowed"),
mount=_("Allows mount/umount of ZFS datasets"),
share=_("Allows sharing file systems over NFS or SMB\n\t\t\t\tprotocols"),
send=_("Allows sending of snapshots"),
hold=_("Allows adding a user hold to a snapshot"),
release=_("Allows releasing a user hold which\n\t\t\t\tmight destroy the snapshot"),
diff=_("Allows lookup of paths within a dataset,\n\t\t\t\tgiven an object number. Ordinary users need this\n\t\t\t\tin order to use zfs diff"),
)
perms_other = dict(
userprop=_("Allows changing any user property"),
userquota=_("Allows accessing any userquota@... property"),
groupquota=_("Allows accessing any groupquota@... property"),
userused=_("Allows reading any userused@... property"),
groupused=_("Allows reading any groupused@... property"),
key=_("Allows load/unload of dataset key"),
keychange=_("Allows key change operations"),
)
def hasset(ds, setname):
"""Return True if the given setname (string) is defined for this
ds (Dataset)."""
# It would be nice to cache the result of get_fsacl().
for raw in ds.get_fsacl().values():
for whokey in raw.keys():
if whokey[0].lower() == "s" and whokey[3:] == setname:
return True
return False
def canonicalized_perm(permname):
"""Return the canonical name (string) for this permission (string).
Raises ZFSError if it is not a valid permission."""
if permname in perms_subcmd.keys() or permname in perms_other.keys():
return permname
try:
return zfs.dataset.getpropobj(permname).name
except KeyError:
raise zfs.util.ZFSError(errno.EINVAL, permname,
_("invalid permission"))
def print_perms():
"""Print the set of supported permissions."""
print(_("The following delegated permissions are supported:\n"))
fmt = "%-16s %-14s\t%s"
print(fmt % (_("NAME"), _("TYPE"), _("NOTES")))
for (name, note) in sorted(perms_subcmd.iteritems()):
print(fmt % (name, _("subcommand"), note))
for (name, note) in sorted(perms_other.iteritems()):
print(fmt % (name, _("other"), note))
# The list of properties is printed by zfs_do_help() in zfs_main.c
def do_allow():
"""Implements the "zfs allow" and "zfs unallow" subcommands."""
un = (sys.argv[1] == "unallow")
def usage(msg=None):
if msg:
print(msg)
if un:
parser.exit(_("For more info, run: zfs help unallow"))
else:
parser.exit(_("For more info, run: zfs help allow"))
else:
parser.print_help()
print(_("\nFor the delegated permission list, run: zfs help permission"))
parser.exit()
if un:
u = _("""unallow [-rldug] <"everyone"|user|group>[,...]
[<perm|@setname>[,...]] <filesystem|volume>
unallow [-rld] -e [<perm|@setname>[,...]] <filesystem|volume>
unallow [-r] -c [<perm|@setname>[,...]] <filesystem|volume>
unallow [-r] -s @setname [<perm|@setname>[,...]] <filesystem|volume>""")
verb = _("remove")
sstr = _("undefine permission set")
else:
u = _("""allow <filesystem|volume>
allow [-ldug] <"everyone"|user|group>[,...] <perm|@setname>[,...]
<filesystem|volume>
allow [-ld] -e <perm|@setname>[,...] <filesystem|volume>
allow -c <perm|@setname>[,...] <filesystem|volume>
allow -s @setname <perm|@setname>[,...] <filesystem|volume>""")
verb = _("set")
sstr = _("define permission set")
parser = zfs.util.ZFSOptionParser(usage=u, prog="zfs")
parser.add_option("-l", action="store_true", dest="local",
help=_("%s permission locally") % verb)
parser.add_option("-d", action="store_true", dest="descend",
help=_("%s permission for descendents") % verb)
parser.add_option("-u", action="store_true", dest="user",
help=_("%s permission for user") % verb)
parser.add_option("-g", action="store_true", dest="group",
help=_("%s permission for group") % verb)
parser.add_option("-e", action="store_true", dest="everyone",
help=_("%s permission for everyone") % verb)
parser.add_option("-c", action="store_true", dest="create",
help=_("%s create time permissions") % verb)
parser.add_option("-s", action="store_true", dest="set", help=sstr)
if un:
parser.add_option("-r", action="store_true", dest="recursive",
help=_("remove permissions recursively"))
if len(sys.argv) == 3 and not un:
# just print the permissions on this fs
if sys.argv[2] == "-h":
# hack to make "zfs allow -h" work
usage()
ds = zfs.dataset.Dataset(sys.argv[2], snaps=False)
p = dict()
for (fs, raw) in ds.get_fsacl().items():
p[fs] = FSPerms(raw)
for fs in sorted(p.keys(), reverse=True):
s = _("---- Permissions on %s ") % fs
print(s + "-" * (70-len(s)))
print(p[fs])
return
(options, args) = parser.parse_args(sys.argv[2:])
if sum((bool(options.everyone), bool(options.user),
bool(options.group))) > 1:
parser.error(_("-u, -g, and -e are mutually exclusive"))
def mungeargs(expected_len):
if un and len(args) == expected_len-1:
return (None, args[expected_len-2])
elif len(args) == expected_len:
p = [e.strip() for e in args[expected_len-2].split(",")]
if '' in p:
usage(_("badly formed comma separated list"))
return (p, args[expected_len-1])
else:
usage(_("wrong number of parameters"))
if options.set:
if options.local or options.descend or options.user or \
options.group or options.everyone or options.create:
parser.error(_("invalid option combined with -s"))
if args[0][0] != "@":
parser.error(_("invalid set name: missing '@' prefix"))
(perms, fsname) = mungeargs(3)
who = args[0]
elif options.create:
if options.local or options.descend or options.user or \
options.group or options.everyone or options.set:
parser.error(_("invalid option combined with -c"))
(perms, fsname) = mungeargs(2)
who = None
elif options.everyone:
if options.user or options.group or \
options.create or options.set:
parser.error(_("invalid option combined with -e"))
(perms, fsname) = mungeargs(2)
who = ["everyone"]
else:
(perms, fsname) = mungeargs(3)
who = [w.strip() for w in args[0].split(",")]
if '' in who:
usage(_("badly formed list of users"))
if not options.local and not options.descend:
options.local = True
options.descend = True
d = args_to_perms(parser, options, who, perms)
ds = zfs.dataset.Dataset(fsname, snaps=False)
if not un and perms:
for p in perms:
if p[0] == "@" and not hasset(ds, p):
parser.error(_("set %s is not defined") % p)
ds.set_fsacl(un, d)
if un and options.recursive:
for child in ds.descendents():
child.set_fsacl(un, d)