cddl/contrib/opensolaris/lib/pyzfs/common/allow.py

   1 #! /usr/bin/python2.4
   2 #
   3 # CDDL HEADER START
   4 #
   5 # The contents of this file are subject to the terms of the
   6 # Common Development and Distribution License (the "License").
   7 # You may not use this file except in compliance with the License.
   8 #
   9 # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10 # or http://www.opensolaris.org/os/licensing.
  11 # See the License for the specific language governing permissions
  12 # and limitations under the License.
  13 #
  14 # When distributing Covered Code, include this CDDL HEADER in each
  15 # file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16 # If applicable, add the following below this CDDL HEADER, with the
  17 # fields enclosed by brackets "[]" replaced with your own identifying
  18 # information: Portions Copyright [yyyy] [name of copyright owner]
  19 #
  20 # CDDL HEADER END
  21 #
  22 # Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  23 # Use is subject to license terms.
  24 #
  25
  26 """This module implements the "zfs allow" and "zfs unallow" subcommands.
  27 The only public interface is the zfs.allow.do_allow() function."""
  28
  29 import zfs.util
  30 import zfs.dataset
  31 import optparse
  32 import sys
  33 import pwd
  34 import grp
  35 import errno
  36
  37 _ = zfs.util._
  38
  39 class FSPerms(object):
  40         """This class represents all the permissions that are set on a
  41         particular filesystem (not including those inherited)."""
  42
  43         __slots__ = "create", "sets", "local", "descend", "ld"
  44         __repr__ = zfs.util.default_repr
  45
  46         def __init__(self, raw):
  47                 """Create a FSPerms based on the dict of raw permissions
  48                 from zfs.ioctl.get_fsacl()."""
  49                 # set of perms
  50                 self.create = set()
  51
  52                 # below are { "Ntype name": set(perms) }
  53                 # where N is a number that we just use for sorting,
  54                 # type is "user", "group", "everyone", or "" (for sets)
  55                 # name is a user, group, or set name, or "" (for everyone)
  56                 self.sets = dict()
  57                 self.local = dict()
  58                 self.descend = dict()
  59                 self.ld = dict()
  60
  61                 # see the comment in dsl_deleg.c for the definition of whokey
  62                 for whokey in raw.keys():
  63                         perms = raw[whokey].keys()
  64                         whotypechr = whokey[0].lower()
  65                         ws = whokey[3:]
  66                         if whotypechr == "c":
  67                                 self.create.update(perms)
  68                         elif whotypechr == "s":
  69                                 nwho = "1" + ws
  70                                 self.sets.setdefault(nwho, set()).update(perms)
  71                         else:
  72                                 if whotypechr == "u":
  73                                         try:
  74                                                 name = pwd.getpwuid(int(ws)).pw_name
  75                                         except KeyError:
  76                                                 name = ws
  77                                         nwho = "1user " + name
  78                                 elif whotypechr == "g":
  79                                         try:
  80                                                 name = grp.getgrgid(int(ws)).gr_name
  81                                         except KeyError:
  82                                                 name = ws
  83                                         nwho = "2group " + name
  84                                 elif whotypechr == "e":
  85                                         nwho = "3everyone"
  86                                 else:
  87                                         raise ValueError(whotypechr)
  88
  89                                 if whokey[1] == "l":
  90                                         d = self.local
  91                                 elif whokey[1] == "d":
  92                                         d = self.descend
  93                                 else:
  94                                         raise ValueError(whokey[1])
  95
  96                                 d.setdefault(nwho, set()).update(perms)
  97
  98                 # Find perms that are in both local and descend, and
  99                 # move them to ld.
 100                 for nwho in self.local:
 101                         if nwho not in self.descend:
 102                                 continue
 103                         # note: these are set operations
 104                         self.ld[nwho] = self.local[nwho] & self.descend[nwho]
 105                         self.local[nwho] -= self.ld[nwho]
 106                         self.descend[nwho] -= self.ld[nwho]
 107
 108         @staticmethod
 109         def __ldstr(d, header):
 110                 s = ""
 111                 for (nwho, perms) in sorted(d.items()):
 112                         # local and descend may have entries where perms
 113                         # is an empty set, due to consolidating all
 114                         # permissions into ld
 115                         if perms:
 116                                 s += "\t%s %s\n" % \
 117                                     (nwho[1:], ",".join(sorted(perms)))
 118                 if s:
 119                         s = header + s
 120                 return s
 121
 122         def __str__(self):
 123                 s = self.__ldstr(self.sets, _("Permission sets:\n"))
 124
 125                 if self.create:
 126                         s += _("Create time permissions:\n")
 127                         s += "\t%s\n" % ",".join(sorted(self.create))
 128
 129                 s += self.__ldstr(self.local, _("Local permissions:\n"))
 130                 s += self.__ldstr(self.descend, _("Descendent permissions:\n"))
 131                 s += self.__ldstr(self.ld, _("Local+Descendent permissions:\n"))
 132                 return s.rstrip()
 133
 134 def args_to_perms(parser, options, who, perms):
 135         """Return a dict of raw perms {"whostr" -> {"perm" -> None}}
 136         based on the command-line input."""
 137
 138         # perms is not set if we are doing a "zfs unallow <who> <fs>" to
 139         # remove all of someone's permissions
 140         if perms:
 141                 setperms = dict(((p, None) for p in perms if p[0] == "@"))
 142                 baseperms = dict(((canonicalized_perm(p), None)
 143                     for p in perms if p[0] != "@"))
 144         else:
 145                 setperms = None
 146                 baseperms = None
 147
 148         d = dict()
 149
 150         def storeperm(typechr, inheritchr, arg):
 151                 assert typechr in "ugecs"
 152                 assert inheritchr in "ld-"
 153
 154                 def mkwhokey(t):
 155                         return "%c%c$%s" % (t, inheritchr, arg)
 156
 157                 if baseperms or not perms:
 158                         d[mkwhokey(typechr)] = baseperms
 159                 if setperms or not perms:
 160                         d[mkwhokey(typechr.upper())] = setperms
 161
 162         def decodeid(w, toidfunc, fmt):
 163                 try:
 164                         return int(w)
 165                 except ValueError:
 166                         try:
 167                                 return toidfunc(w)[2]
 168                         except KeyError:
 169                                 parser.error(fmt % w)
 170
 171         if options.set:
 172                 storeperm("s", "-", who)
 173         elif options.create:
 174                 storeperm("c", "-", "")
 175         else:
 176                 for w in who:
 177                         if options.user:
 178                                 id = decodeid(w, pwd.getpwnam,
 179                                     _("invalid user %s"))
 180                                 typechr = "u"
 181                         elif options.group:
 182                                 id = decodeid(w, grp.getgrnam,
 183                                     _("invalid group %s"))
 184                                 typechr = "g"
 185                         elif w == "everyone":
 186                                 id = ""
 187                                 typechr = "e"
 188                         else:
 189                                 try:
 190                                         id = pwd.getpwnam(w)[2]
 191                                         typechr = "u"
 192                                 except KeyError:
 193                                         try:
 194                                                 id = grp.getgrnam(w)[2]
 195                                                 typechr = "g"
 196                                         except KeyError:
 197                                                 parser.error(_("invalid user/group %s") % w)
 198                         if options.local:
 199                                 storeperm(typechr, "l", id)
 200                         if options.descend:
 201                                 storeperm(typechr, "d", id)
 202         return d
 203
 204 perms_subcmd = dict(
 205     create=_("Must also have the 'mount' ability"),
 206     destroy=_("Must also have the 'mount' ability"),
 207     snapshot=_("Must also have the 'mount' ability"),
 208     rollback=_("Must also have the 'mount' ability"),
 209     clone=_("""Must also have the 'create' ability and 'mount'
 210 \t\t\t\tability in the origin file system"""),
 211     promote=_("""Must also have the 'mount'
 212 \t\t\t\tand 'promote' ability in the origin file system"""),
 213     rename=_("""Must also have the 'mount' and 'create'
 214 \t\t\t\tability in the new parent"""),
 215     receive=_("Must also have the 'mount' and 'create' ability"),
 216     allow=_("Must also have the permission that is being\n\t\t\t\tallowed"),
 217     mount=_("Allows mount/umount of ZFS datasets"),
 218     share=_("Allows sharing file systems over NFS or SMB\n\t\t\t\tprotocols"),
 219     send="",
 220 )
 221
 222 perms_other = dict(
 223     userprop=_("Allows changing any user property"),
 224     userquota=_("Allows accessing any userquota@... property"),
 225     groupquota=_("Allows accessing any groupquota@... property"),
 226     userused=_("Allows reading any userused@... property"),
 227     groupused=_("Allows reading any groupused@... property"),
 228 )
 229
 230 def hasset(ds, setname):
 231         """Return True if the given setname (string) is defined for this
 232         ds (Dataset)."""
 233         # It would be nice to cache the result of get_fsacl().
 234         for raw in ds.get_fsacl().values():
 235                 for whokey in raw.keys():
 236                         if whokey[0].lower() == "s" and whokey[3:] == setname:
 237                                 return True
 238         return False
 239
 240 def canonicalized_perm(permname):
 241         """Return the canonical name (string) for this permission (string).
 242         Raises ZFSError if it is not a valid permission."""
 243         if permname in perms_subcmd.keys() or permname in perms_other.keys():
 244                 return permname
 245         try:
 246                 return zfs.dataset.getpropobj(permname).name
 247         except KeyError:
 248                 raise zfs.util.ZFSError(errno.EINVAL, permname,
 249                     _("invalid permission"))
 250
 251 def print_perms():
 252         """Print the set of supported permissions."""
 253         print(_("\nThe following permissions are supported:\n"))
 254         fmt = "%-16s %-14s\t%s"
 255         print(fmt % (_("NAME"), _("TYPE"), _("NOTES")))
 256
 257         for (name, note) in sorted(perms_subcmd.iteritems()):
 258                 print(fmt % (name, _("subcommand"), note))
 259
 260         for (name, note) in sorted(perms_other.iteritems()):
 261                 print(fmt % (name, _("other"), note))
 262
 263         for (name, prop) in sorted(zfs.dataset.proptable.iteritems()):
 264                 if prop.visible and prop.delegatable():
 265                         print(fmt % (name, _("property"), ""))
 266
 267 def do_allow():
 268         """Implementes the "zfs allow" and "zfs unallow" subcommands."""
 269         un = (sys.argv[1] == "unallow")
 270
 271         def usage(msg=None):
 272                 parser.print_help()
 273                 print_perms()
 274                 if msg:
 275                         print
 276                         parser.exit("zfs: error: " + msg)
 277                 else:
 278                         parser.exit()
 279
 280         if un:
 281                 u = _("""unallow [-rldug] <"everyone"|user|group>[,...]
 282             [<perm|@setname>[,...]] <filesystem|volume>
 283         unallow [-rld] -e [<perm|@setname>[,...]] <filesystem|volume>
 284         unallow [-r] -c [<perm|@setname>[,...]] <filesystem|volume>
 285         unallow [-r] -s @setname [<perm|@setname>[,...]] <filesystem|volume>""")
 286                 verb = _("remove")
 287                 sstr = _("undefine permission set")
 288         else:
 289                 u = _("""allow <filesystem|volume>
 290         allow [-ldug] <"everyone"|user|group>[,...] <perm|@setname>[,...]
 291             <filesystem|volume>
 292         allow [-ld] -e <perm|@setname>[,...] <filesystem|volume>
 293         allow -c <perm|@setname>[,...] <filesystem|volume>
 294         allow -s @setname <perm|@setname>[,...] <filesystem|volume>""")
 295                 verb = _("set")
 296                 sstr = _("define permission set")
 297
 298         parser = optparse.OptionParser(usage=u, prog="zfs")
 299
 300         parser.add_option("-l", action="store_true", dest="local",
 301             help=_("%s permission locally") % verb)
 302         parser.add_option("-d", action="store_true", dest="descend",
 303             help=_("%s permission for descendents") % verb)
 304         parser.add_option("-u", action="store_true", dest="user",
 305             help=_("%s permission for user") % verb)
 306         parser.add_option("-g", action="store_true", dest="group",
 307             help=_("%s permission for group") % verb)
 308         parser.add_option("-e", action="store_true", dest="everyone",
 309             help=_("%s permission for everyone") % verb)
 310         parser.add_option("-c", action="store_true", dest="create",
 311             help=_("%s create time permissions") % verb)
 312         parser.add_option("-s", action="store_true", dest="set", help=sstr)
 313         if un:
 314                 parser.add_option("-r", action="store_true", dest="recursive",
 315                     help=_("remove permissions recursively"))
 316
 317         if len(sys.argv) == 3 and not un:
 318                 # just print the permissions on this fs
 319
 320                 if sys.argv[2] == "-h":
 321                         # hack to make "zfs allow -h" work
 322                         usage()
 323                 ds = zfs.dataset.Dataset(sys.argv[2])
 324
 325                 p = dict()
 326                 for (fs, raw) in ds.get_fsacl().items():
 327                         p[fs] = FSPerms(raw)
 328
 329                 for fs in sorted(p.keys(), reverse=True):
 330                         s = _("---- Permissions on %s ") % fs
 331                         print(s + "-" * (70-len(s)))
 332                         print(p[fs])
 333                 return
 334
 335
 336         (options, args) = parser.parse_args(sys.argv[2:])
 337
 338         if sum((bool(options.everyone), bool(options.user),
 339             bool(options.group))) > 1:
 340                 parser.error(_("-u, -g, and -e are mutually exclusive"))
 341
 342         def mungeargs(expected_len):
 343                 if un and len(args) == expected_len-1:
 344                         return (None, args[expected_len-2])
 345                 elif len(args) == expected_len:
 346                         return (args[expected_len-2].split(","),
 347                             args[expected_len-1])
 348                 else:
 349                         usage(_("wrong number of parameters"))
 350
 351         if options.set:
 352                 if options.local or options.descend or options.user or \
 353                     options.group or options.everyone or options.create:
 354                         parser.error(_("invalid option combined with -s"))
 355                 if args[0][0] != "@":
 356                         parser.error(_("invalid set name: missing '@' prefix"))
 357
 358                 (perms, fsname) = mungeargs(3)
 359                 who = args[0]
 360         elif options.create:
 361                 if options.local or options.descend or options.user or \
 362                     options.group or options.everyone or options.set:
 363                         parser.error(_("invalid option combined with -c"))
 364
 365                 (perms, fsname) = mungeargs(2)
 366                 who = None
 367         elif options.everyone:
 368                 if options.user or options.group or \
 369                     options.create or options.set:
 370                         parser.error(_("invalid option combined with -e"))
 371
 372                 (perms, fsname) = mungeargs(2)
 373                 who = ["everyone"]
 374         else:
 375                 (perms, fsname) = mungeargs(3)
 376                 who = args[0].split(",")
 377
 378         if not options.local and not options.descend:
 379                 options.local = True
 380                 options.descend = True
 381
 382         d = args_to_perms(parser, options, who, perms)
 383
 384         ds = zfs.dataset.Dataset(fsname, snaps=False)
 385
 386         if not un and perms:
 387                 for p in perms:
 388                         if p[0] == "@" and not hasset(ds, p):
 389                                 parser.error(_("set %s is not defined") % p)
 390
 391         ds.set_fsacl(un, d)
 392         if un and options.recursive:
 393                 for child in ds.descendents():
 394                         child.set_fsacl(un, d)