python/samba/getopt.py

   1 # Samba-specific bits for optparse
   2 # Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2007
   3 #
   4 # This program is free software; you can redistribute it and/or modify
   5 # it under the terms of the GNU General Public License as published by
   6 # the Free Software Foundation; either version 3 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 #
  17
  18 """Support for parsing Samba-related command-line options."""
  19
  20 __docformat__ = "restructuredText"
  21
  22 import optparse
  23 import os
  24 import sys
  25 from abc import ABCMeta, abstractmethod
  26 from copy import copy
  27
  28 from samba.credentials import (
  29     Credentials,
  30     AUTO_USE_KERBEROS,
  31     DONT_USE_KERBEROS,
  32     MUST_USE_KERBEROS,
  33 )
  34 from samba._glue import get_burnt_commandline
  35
  36
  37 def check_bytes(option, opt, value):
  38     """Custom option type to allow the input of sizes using byte, kb, mb ...
  39
  40     units, e.g. 2Gb, 4KiB ...
  41        e.g. Option("--size", type="bytes", metavar="SIZE")
  42     """
  43
  44     multipliers = {"B": 1,
  45                    "KB": 1024,
  46                    "MB": 1024 * 1024,
  47                    "GB": 1024 * 1024 * 1024}
  48
  49     # strip out any spaces
  50     v = value.replace(" ", "")
  51
  52     # extract the numeric prefix
  53     digits = ""
  54     while v and v[0:1].isdigit() or v[0:1] == '.':
  55         digits += v[0]
  56         v = v[1:]
  57
  58     try:
  59         m = float(digits)
  60     except ValueError:
  61         msg = ("{0} option requires a numeric value, "
  62                "with an optional unit suffix").format(opt)
  63         raise optparse.OptionValueError(msg)
  64
  65     # strip out the 'i' and convert to upper case so
  66     # kib Kib kb KB are all equivalent
  67     suffix = v.upper().replace("I", "")
  68     try:
  69         return m * multipliers[suffix]
  70     except KeyError as k:
  71         msg = ("{0} invalid suffix '{1}', "
  72                "should be B, Kb, Mb or Gb").format(opt, v)
  73         raise optparse.OptionValueError(msg)
  74
  75
  76 class OptionMissingError(optparse.OptionValueError):
  77     """One or more Options with required=True is missing."""
  78
  79     def __init__(self, options):
  80         """Raised when required Options are missing from the command line.
  81
  82         :param options: list of 1 or more option
  83         """
  84         self.options = options
  85
  86     def __str__(self):
  87         if len(self.options) == 1:
  88             missing = self.options[0]
  89             return f"Argument {missing} is required."
  90         else:
  91             options = sorted([str(option) for option in self.options])
  92             missing = ", ".join(options)
  93             return f"The arguments {missing} are required."
  94
  95
  96 class ValidationError(Exception):
  97     """ValidationError is the exception raised by validators.
  98
  99     Should be raised from the __call__ method of the Validator subclass.
 100     """
 101     pass
 102
 103
 104 class Validator(metaclass=ABCMeta):
 105     """Base class for Validators used by SambaOption.
 106
 107     Subclass this to make custom validators and implement __call__.
 108     """
 109
 110     @abstractmethod
 111     def __call__(self, field, value):
 112         pass
 113
 114
 115 class Option(optparse.Option):
 116     ATTRS = optparse.Option.ATTRS + ["required", "validators"]
 117     TYPES = optparse.Option.TYPES + ("bytes",)
 118     TYPE_CHECKER = copy(optparse.Option.TYPE_CHECKER)
 119     TYPE_CHECKER["bytes"] = check_bytes
 120
 121     def run_validators(self, opt, value):
 122         """Runs the list of validators on the current option."""
 123         validators = getattr(self, "validators") or []
 124         for validator in validators:
 125             validator(opt, value)
 126
 127     def convert_value(self, opt, value):
 128         """Override convert_value to run validators just after.
 129
 130         This can also be done in process() but there we would have to
 131         replace the entire method.
 132         """
 133         value = super().convert_value(opt, value)
 134         self.run_validators(opt, value)
 135         return value
 136
 137
 138 class OptionParser(optparse.OptionParser):
 139     """Samba OptionParser, adding support for required=True on Options."""
 140
 141     def __init__(self,
 142                  usage=None,
 143                  option_list=None,
 144                  option_class=Option,
 145                  version=None,
 146                  conflict_handler="error",
 147                  description=None,
 148                  formatter=None,
 149                  add_help_option=True,
 150                  prog=None,
 151                  epilog=None):
 152         """
 153         Ensure that option_class defaults to the Samba one.
 154         """
 155         super().__init__(usage, option_list, option_class, version,
 156                          conflict_handler, description, formatter,
 157                          add_help_option, prog, epilog)
 158
 159     def check_values(self, values, args):
 160         """Loop through required options if value is missing raise exception."""
 161         missing = []
 162         for option in self._get_all_options():
 163             if option.required:
 164                 value = getattr(values, option.dest)
 165                 if value is None:
 166                     missing.append(option)
 167
 168         if missing:
 169             raise OptionMissingError(missing)
 170
 171         return super().check_values(values, args)
 172
 173
 174 class OptionGroup(optparse.OptionGroup):
 175     """Samba OptionGroup base class.
 176
 177     Provides a generic set_option method to be used as Option callback,
 178     so that one doesn't need to be created for every available Option.
 179
 180     Also overrides the add_option method, so it correctly initialises
 181     the defaults on the OptionGroup.
 182     """
 183
 184     def add_option(self, *args, **kwargs):
 185         """Override add_option so it applies defaults during constructor."""
 186         opt = super().add_option(*args, **kwargs)
 187         default = None if opt.default == optparse.NO_DEFAULT else opt.default
 188         self.set_option(opt, opt.get_opt_string(), default, self.parser)
 189         return opt
 190
 191     def set_option(self, option, opt_str, arg, parser):
 192         """Callback to set the attribute based on the Option dest name."""
 193         dest = option.dest or option._long_opts[0][2:].replace("-", "_")
 194         setattr(self, dest, arg)
 195
 196
 197 class SambaOptions(OptionGroup):
 198     """General Samba-related command line options."""
 199
 200     def __init__(self, parser):
 201         from samba import fault_setup
 202         fault_setup()
 203
 204         # This removes passwords from the commandline via
 205         # setproctitle() but makes no change to python sys.argv so we
 206         # can continue to process as normal
 207         #
 208         # get_burnt_commandline returns None if no change is needed
 209         new_proctitle = get_burnt_commandline(sys.argv)
 210         if new_proctitle is not None:
 211             try:
 212                 import setproctitle
 213                 setproctitle.setproctitle(new_proctitle)
 214
 215             except ModuleNotFoundError:
 216                 msg = ("WARNING: Using passwords on command line is insecure. "
 217                        "Installing the setproctitle python module will hide "
 218                        "these from shortly after program start.\n")
 219                 sys.stderr.write(msg)
 220                 sys.stderr.flush()
 221
 222         from samba.param import LoadParm
 223         super().__init__(parser, "Samba Common Options")
 224         self.add_option("-s", "--configfile", action="callback",
 225                         type=str, metavar="FILE", help="Configuration file",
 226                         callback=self._load_configfile)
 227         self.add_option("-d", "--debuglevel", action="callback",
 228                         type=str, metavar="DEBUGLEVEL", help="debug level",
 229                         callback=self._set_debuglevel)
 230         self.add_option("--option", action="callback",
 231                         type=str, metavar="OPTION",
 232                         help="set smb.conf option from command line",
 233                         callback=self._set_option)
 234         self.add_option("--realm", action="callback",
 235                         type=str, metavar="REALM", help="set the realm name",
 236                         callback=self._set_realm)
 237         self._configfile = None
 238         self._lp = LoadParm()
 239         self.realm = None
 240
 241     def get_loadparm_path(self):
 242         """Return path to the smb.conf file specified on the command line."""
 243         return self._configfile
 244
 245     def _load_configfile(self, option, opt_str, arg, parser):
 246         self._configfile = arg
 247
 248     def _set_debuglevel(self, option, opt_str, arg, parser):
 249         try:
 250             self._lp.set('debug level', arg)
 251         except RuntimeError:
 252             raise optparse.OptionValueError(
 253                 f"invalid -d/--debug value: '{arg}'")
 254         parser.values.debuglevel = arg
 255
 256     def _set_realm(self, option, opt_str, arg, parser):
 257         try:
 258             self._lp.set('realm', arg)
 259         except RuntimeError:
 260             raise optparse.OptionValueError(
 261                 f"invalid --realm value: '{arg}'")
 262         self.realm = arg
 263
 264     def _set_option(self, option, opt_str, arg, parser):
 265         if arg.find('=') == -1:
 266             raise optparse.OptionValueError(
 267                 "--option option takes a 'a=b' argument")
 268         a = arg.split('=', 1)
 269         try:
 270             self._lp.set(a[0], a[1])
 271         except Exception as e:
 272             raise optparse.OptionValueError(
 273                 "invalid --option option value %r: %s" % (arg, e))
 274
 275     def get_loadparm(self):
 276         """Return loadparm object with data specified on the command line."""
 277         if self._configfile is not None:
 278             self._lp.load(self._configfile)
 279         elif os.getenv("SMB_CONF_PATH") is not None:
 280             self._lp.load(os.getenv("SMB_CONF_PATH"))
 281         else:
 282             self._lp.load_default()
 283         return self._lp
 284
 285
 286 class Samba3Options(SambaOptions):
 287     """General Samba-related command line options with an s3 param."""
 288
 289     def __init__(self, parser):
 290         super().__init__(parser)
 291         from samba.samba3 import param as s3param
 292         self._lp = s3param.get_context()
 293
 294
 295 class HostOptions(OptionGroup):
 296     """Command line options for connecting to target host or database."""
 297
 298     def __init__(self, parser):
 299         super().__init__(parser, "Host Options")
 300
 301         self.add_option("-H", "--URL",
 302                         help="LDB URL for database or target server",
 303                         type=str, metavar="URL", action="callback",
 304                         callback=self.set_option, dest="H")
 305
 306
 307 class VersionOptions(OptionGroup):
 308     """Command line option for printing Samba version."""
 309     def __init__(self, parser):
 310         super().__init__(parser, "Version Options")
 311         self.add_option("-V", "--version", action="callback",
 312                         callback=self._display_version,
 313                         help="Display version number")
 314
 315     def _display_version(self, option, opt_str, arg, parser):
 316         import samba
 317         print(samba.version)
 318         sys.exit(0)
 319
 320
 321 def parse_kerberos_arg_legacy(arg, opt_str):
 322     if arg.lower() in ["yes", 'true', '1']:
 323         return MUST_USE_KERBEROS
 324     elif arg.lower() in ["no", 'false', '0']:
 325         return DONT_USE_KERBEROS
 326     elif arg.lower() in ["auto"]:
 327         return AUTO_USE_KERBEROS
 328     else:
 329         raise optparse.OptionValueError("invalid %s option value: %s" %
 330                                         (opt_str, arg))
 331
 332
 333 def parse_kerberos_arg(arg, opt_str):
 334     if arg.lower() == 'required':
 335         return MUST_USE_KERBEROS
 336     elif arg.lower() == 'desired':
 337         return AUTO_USE_KERBEROS
 338     elif arg.lower() == 'off':
 339         return DONT_USE_KERBEROS
 340     else:
 341         raise optparse.OptionValueError("invalid %s option value: %s" %
 342                                         (opt_str, arg))
 343
 344
 345 class CredentialsOptions(OptionGroup):
 346     """Command line options for specifying credentials."""
 347
 348     def __init__(self, parser, special_name=None):
 349         self.special_name = special_name
 350         if special_name is not None:
 351             self.section = "Credentials Options (%s)" % special_name
 352         else:
 353             self.section = "Credentials Options"
 354
 355         self.ask_for_password = True
 356         self.ipaddress = None
 357         self.machine_pass = False
 358         super().__init__(parser, self.section)
 359         self._add_option("--simple-bind-dn", metavar="DN", action="callback",
 360                          callback=self._set_simple_bind_dn, type=str,
 361                          help="DN to use for a simple bind")
 362         self._add_option("--password", metavar="PASSWORD", action="callback",
 363                          help="Password", type=str, callback=self._set_password)
 364         self._add_option("-U", "--username", metavar="USERNAME",
 365                          action="callback", type=str,
 366                          help="Username", callback=self._parse_username)
 367         self._add_option("-W", "--workgroup", metavar="WORKGROUP",
 368                          action="callback", type=str,
 369                          help="Workgroup", callback=self._parse_workgroup)
 370         self._add_option("-N", "--no-pass", action="callback",
 371                          help="Don't ask for a password",
 372                          callback=self._set_no_password)
 373         self._add_option("", "--ipaddress", metavar="IPADDRESS",
 374                          action="callback", type=str,
 375                          help="IP address of server",
 376                          callback=self._set_ipaddress)
 377         self._add_option("-P", "--machine-pass",
 378                          action="callback",
 379                          help="Use stored machine account password",
 380                          callback=self._set_machine_pass)
 381         self._add_option("--use-kerberos", metavar="desired|required|off",
 382                          action="callback", type=str,
 383                          help="Use Kerberos authentication", callback=self._set_kerberos)
 384         self._add_option("--use-krb5-ccache", metavar="KRB5CCNAME",
 385                          action="callback", type=str,
 386                          help="Kerberos Credentials cache",
 387                          callback=self._set_krb5_ccache)
 388         self._add_option("-A", "--authentication-file", metavar="AUTHFILE",
 389                          action="callback", type=str,
 390                          help="Authentication file",
 391                          callback=self._set_auth_file)
 392
 393         # LEGACY
 394         self._add_option("-k", "--kerberos", metavar="KERBEROS",
 395                          action="callback", type=str,
 396                          help="DEPRECATED: Migrate to --use-kerberos", callback=self._set_kerberos_legacy)
 397         self.creds = Credentials()
 398
 399     def _add_option(self, *args1, **kwargs):
 400         if self.special_name is None:
 401             return self.add_option(*args1, **kwargs)
 402
 403         args2 = ()
 404         for a in args1:
 405             if not a.startswith("--"):
 406                 continue
 407             args2 += (a.replace("--", "--%s-" % self.special_name),)
 408         self.add_option(*args2, **kwargs)
 409
 410     def _parse_username(self, option, opt_str, arg, parser):
 411         self.creds.parse_string(arg)
 412         self.machine_pass = False
 413
 414     def _parse_workgroup(self, option, opt_str, arg, parser):
 415         self.creds.set_domain(arg)
 416
 417     def _set_password(self, option, opt_str, arg, parser):
 418         self.creds.set_password(arg)
 419         self.ask_for_password = False
 420         self.machine_pass = False
 421
 422     def _set_no_password(self, option, opt_str, arg, parser):
 423         self.ask_for_password = False
 424
 425     def _set_machine_pass(self, option, opt_str, arg, parser):
 426         self.machine_pass = True
 427
 428     def _set_ipaddress(self, option, opt_str, arg, parser):
 429         self.ipaddress = arg
 430
 431     def _set_kerberos_legacy(self, option, opt_str, arg, parser):
 432         print('WARNING: The option -k|--kerberos is deprecated!')
 433         self.creds.set_kerberos_state(parse_kerberos_arg_legacy(arg, opt_str))
 434
 435     def _set_kerberos(self, option, opt_str, arg, parser):
 436         self.creds.set_kerberos_state(parse_kerberos_arg(arg, opt_str))
 437
 438     def _set_simple_bind_dn(self, option, opt_str, arg, parser):
 439         self.creds.set_bind_dn(arg)
 440
 441     def _set_krb5_ccache(self, option, opt_str, arg, parser):
 442         self.ask_for_password = False
 443         self.creds.set_kerberos_state(MUST_USE_KERBEROS)
 444         self.creds.set_named_ccache(arg)
 445
 446     def _set_auth_file(self, option, opt_str, arg, parser):
 447         if os.path.exists(arg):
 448             self.creds.parse_file(arg)
 449             self.ask_for_password = False
 450             self.machine_pass = False
 451
 452     def get_credentials(self, lp, fallback_machine=False):
 453         """Obtain the credentials set on the command-line.
 454
 455         :param lp: Loadparm object to use.
 456         :return: Credentials object
 457         """
 458         self.creds.guess(lp)
 459         if self.machine_pass:
 460             self.creds.set_machine_account(lp)
 461         elif self.ask_for_password:
 462             self.creds.set_cmdline_callbacks()
 463
 464         # possibly fallback to using the machine account, if we have
 465         # access to the secrets db
 466         if fallback_machine and not self.creds.authentication_requested():
 467             try:
 468                 self.creds.set_machine_account(lp)
 469             except Exception:
 470                 pass
 471
 472         return self.creds
 473
 474
 475 class CredentialsOptionsDouble(CredentialsOptions):
 476     """Command line options for specifying credentials of two servers."""
 477
 478     def __init__(self, parser):
 479         super().__init__(parser)
 480         self.no_pass2 = True
 481         self.add_option("--simple-bind-dn2", metavar="DN2", action="callback",
 482                         callback=self._set_simple_bind_dn2, type=str,
 483                         help="DN to use for a simple bind")
 484         self.add_option("--password2", metavar="PASSWORD2", action="callback",
 485                         help="Password", type=str,
 486                         callback=self._set_password2)
 487         self.add_option("--username2", metavar="USERNAME2",
 488                         action="callback", type=str,
 489                         help="Username for second server",
 490                         callback=self._parse_username2)
 491         self.add_option("--workgroup2", metavar="WORKGROUP2",
 492                         action="callback", type=str,
 493                         help="Workgroup for second server",
 494                         callback=self._parse_workgroup2)
 495         self.add_option("--no-pass2", action="store_true",
 496                         help="Don't ask for a password for the second server")
 497         self.add_option("--use-kerberos2", metavar="desired|required|off",
 498                         action="callback", type=str,
 499                         help="Use Kerberos authentication", callback=self._set_kerberos2)
 500
 501         # LEGACY
 502         self.add_option("--kerberos2", metavar="KERBEROS2",
 503                         action="callback", type=str,
 504                         help="Use Kerberos", callback=self._set_kerberos2_legacy)
 505         self.creds2 = Credentials()
 506
 507     def _parse_username2(self, option, opt_str, arg, parser):
 508         self.creds2.parse_string(arg)
 509
 510     def _parse_workgroup2(self, option, opt_str, arg, parser):
 511         self.creds2.set_domain(arg)
 512
 513     def _set_password2(self, option, opt_str, arg, parser):
 514         self.creds2.set_password(arg)
 515         self.no_pass2 = False
 516
 517     def _set_kerberos2_legacy(self, option, opt_str, arg, parser):
 518         self.creds2.set_kerberos_state(parse_kerberos_arg(arg, opt_str))
 519
 520     def _set_kerberos2(self, option, opt_str, arg, parser):
 521         self.creds2.set_kerberos_state(parse_kerberos_arg(arg, opt_str))
 522
 523     def _set_simple_bind_dn2(self, option, opt_str, arg, parser):
 524         self.creds2.set_bind_dn(arg)
 525
 526     def get_credentials2(self, lp, guess=True):
 527         """Obtain the credentials set on the command-line.
 528
 529         :param lp: Loadparm object to use.
 530         :param guess: Try guess Credentials from environment
 531         :return: Credentials object
 532         """
 533         if guess:
 534             self.creds2.guess(lp)
 535         elif not self.creds2.get_username():
 536             self.creds2.set_anonymous()
 537
 538         if self.no_pass2:
 539             self.creds2.set_cmdline_callbacks()
 540         return self.creds2