/usr/lib/python2.7/dist-packages/ufw/parser.py is in python-ufw 0.35-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 | #
# parser.py: parser class for ufw
#
# Copyright 2009-2016 Canonical Ltd.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3,
# as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
#
# Adding New Commands
#
# 1. Create a new UFWCommandFoo object that implements UFWCommand
# 2. Create UFWCommandFoo.parse() to return a UFWParserResponse object
# 3. Create UFWCommandFoo.help() to display help for this command
# 4. Register this command with the parser using:
# parser.register_command(UFWCommandFoo('foo'))
#
#
# Extending Existing Commands
#
# 1. Register the new command with an existing UFWCommand via
# register_command(). Eg
# parser.register_command(UFWCommandNewcommand('new_command'))
# 2. Update UFWCommandExisting.parse() for new_command
# 3. Update UFWCommandExisting.help() for new_command
#
import re
import ufw.util
import ufw.applications
from ufw.common import UFWError
from ufw.util import debug
class UFWCommand:
'''Generic class for parser commands.'''
def __init__(self, type, command):
self.command = command
self.types = []
if type not in self.types:
self.types.append(type)
self.type = type
def parse(self, argv):
if len(argv) < 1:
raise ValueError()
r = UFWParserResponse(argv[0].lower())
return r
def help(self, args):
raise UFWError("UFWCommand.help: need to override")
class UFWCommandRule(UFWCommand):
'''Class for parsing ufw rule commands'''
def __init__(self, command):
type = 'rule'
UFWCommand.__init__(self, type, command)
def parse(self, argv):
action = ""
rule = ""
type = ""
from_type = "any"
to_type = "any"
from_service = ""
to_service = ""
insert_pos = ""
logtype = ""
remove = False
if len(argv) > 0 and argv[0].lower() == "rule":
argv.remove(argv[0])
# TODO: break this out
if len(argv) > 0:
if argv[0].lower() == "delete" and len(argv) > 1:
remove = True
argv.remove(argv[0])
rule_num = None
try:
rule_num = int(argv[0])
except Exception:
action = argv[0]
# return quickly if deleting by rule number
if rule_num != None:
r = UFWParserResponse('delete-%d' % rule_num)
return r
elif argv[0].lower() == "insert":
if len(argv) < 4:
raise ValueError()
insert_pos = argv[1]
# Using position '0' adds rule at end, which is potentially
# confusing for the end user
if insert_pos == "0":
err_msg = _("Cannot insert rule at position '%s'") % \
(insert_pos)
raise UFWError(err_msg)
# strip out 'insert NUM' and parse as normal
del argv[1]
del argv[0]
action = argv[0]
if action != "allow" and action != "deny" and action != "reject" and \
action != "limit":
raise ValueError()
nargs = len(argv)
if nargs < 2:
raise ValueError()
# set/strip
rule_direction = "in"
if nargs > 1 and (argv[1].lower() == "in" or \
argv[1].lower() == "out"):
rule_direction = argv[1].lower()
# strip out direction if not an interface rule
if nargs > 2 and argv[2] != "on" and (argv[1].lower() == "in" or \
argv[1].lower() == "out"):
rule_direction = argv[1].lower()
del argv[1]
nargs = len(argv)
# strip out 'on' as in 'allow in on eth0 ...'
has_interface = False
if nargs > 1 and (argv.count('in') > 0 or argv.count('out') > 0):
err_msg = _("Invalid interface clause")
if argv[1].lower() != "in" and argv[1].lower() != "out":
raise UFWError(err_msg)
if nargs < 3 or argv[2].lower() != "on":
raise UFWError(err_msg)
del argv[2]
nargs = len(argv)
has_interface = True
log_idx = 0
if has_interface and nargs > 3 and (argv[3].lower() == "log" or \
argv[3].lower() == 'log-all'):
log_idx = 3
elif nargs > 2 and (argv[1].lower() == "log" or \
argv[1].lower() == 'log-all'):
log_idx = 1
if log_idx > 0:
logtype = argv[log_idx].lower()
# strip out 'log' or 'log-all' and parse as normal
del argv[log_idx]
nargs = len(argv)
if "log" in argv:
err_msg = _("Option 'log' not allowed here")
raise UFWError(err_msg)
if "log-all" in argv:
err_msg = _("Option 'log-all' not allowed here")
raise UFWError(err_msg)
comment = ""
if 'comment' in argv:
comment_idx = argv.index("comment")
if comment_idx == len(argv) - 1:
err_msg = _("Option 'comment' missing required argument")
raise UFWError(err_msg)
comment = argv[comment_idx+1]
del argv[comment_idx+1]
del argv[comment_idx]
nargs = len(argv)
if nargs < 2 or nargs > 13:
raise ValueError()
rule_action = action
if logtype != "":
rule_action += "_" + logtype
rule = ufw.common.UFWRule(rule_action, "any", "any", \
direction=rule_direction,
comment=ufw.util.hex_encode(comment))
if remove:
rule.remove = remove
elif insert_pos != "":
try:
rule.set_position(insert_pos)
except Exception:
raise
if nargs == 2:
# Short form where only app or port/proto is given
if ufw.applications.valid_profile_name(argv[1]):
# Check if name collision with /etc/services. If so, use
# /etc/services instead of application profile
try:
ufw.util.get_services_proto(argv[1])
except Exception:
type = "both"
rule.dapp = argv[1]
rule.set_port(argv[1], "dst")
if rule.dapp == "":
try:
(port, proto) = ufw.util.parse_port_proto(argv[1])
except ValueError as e:
raise UFWError(e)
if not re.match('^\d([0-9,:]*\d+)*$', port):
if ',' in port or ':' in port:
err_msg = _("Port ranges must be numeric")
raise UFWError(err_msg)
to_service = port
try:
rule.set_protocol(proto)
rule.set_port(port, "dst")
type = "both"
except UFWError:
err_msg = _("Bad port")
raise UFWError(err_msg)
elif (nargs + 1) % 2 != 0:
err_msg = _("Wrong number of arguments")
raise UFWError(err_msg)
elif not 'from' in argv and not 'to' in argv and not 'in' in argv and \
not 'out' in argv:
err_msg = _("Need 'to' or 'from' clause")
raise UFWError(err_msg)
else:
# Full form with PF-style syntax
keys = [ 'proto', 'from', 'to', 'port', 'app', 'in', 'out' ]
# quick check
if argv.count("to") > 1 or \
argv.count("from") > 1 or \
argv.count("proto") > 1 or \
argv.count("port") > 2 or \
argv.count("in") > 1 or \
argv.count("out") > 1 or \
argv.count("app") > 2 or \
argv.count("app") > 0 and argv.count("proto") > 0:
err_msg = _("Improper rule syntax")
raise UFWError(err_msg)
i = 0
loc = ""
for arg in argv:
if i % 2 != 0 and argv[i] not in keys:
err_msg = _("Invalid token '%s'") % (argv[i])
raise UFWError(err_msg)
if arg == "proto":
if i+1 < nargs:
try:
rule.set_protocol(argv[i+1])
except Exception:
raise
else: # pragma: no cover
# This can't normally be reached because of nargs
# checks above, but leave it here in case our parsing
# changes
err_msg = _("Invalid 'proto' clause")
raise UFWError(err_msg)
elif arg == "in" or arg == "out":
if i+1 < nargs:
try:
if arg == "in":
rule.set_interface("in", argv[i+1])
elif arg == "out":
rule.set_interface("out", argv[i+1])
except Exception:
raise
else: # pragma: no cover
# This can't normally be reached because of nargs
# checks above, but leave it here in case our parsing
# changes
err_msg = _("Invalid '%s' clause") % (arg)
raise UFWError(err_msg)
elif arg == "from":
if i+1 < nargs:
try:
faddr = argv[i+1].lower()
if faddr == "any":
faddr = "0.0.0.0/0"
from_type = "any"
else:
if ufw.util.valid_address(faddr, "6"):
from_type = "v6"
else:
from_type = "v4"
rule.set_src(faddr)
except Exception:
raise
loc = "src"
else: # pragma: no cover
# This can't normally be reached because of nargs
# checks above, but leave it here in case our parsing
# changes
err_msg = _("Invalid 'from' clause")
raise UFWError(err_msg)
elif arg == "to":
if i+1 < nargs:
try:
saddr = argv[i+1].lower()
if saddr == "any":
saddr = "0.0.0.0/0"
to_type = "any"
else:
if ufw.util.valid_address(saddr, "6"):
to_type = "v6"
else:
to_type = "v4"
rule.set_dst(saddr)
except Exception:
raise
loc = "dst"
else: # pragma: no cover
# This can't normally be reached because of nargs
# checks above, but leave it here in case our parsing
# changes
err_msg = _("Invalid 'to' clause")
raise UFWError(err_msg)
elif arg == "port" or arg == "app":
if i+1 < nargs:
if loc == "":
err_msg = _("Need 'from' or 'to' with '%s'") % \
(arg)
raise UFWError(err_msg)
tmp = argv[i+1]
if arg == "app":
if loc == "src":
rule.sapp = tmp
else:
rule.dapp = tmp
elif not re.match('^\d([0-9,:]*\d+)*$', tmp):
if ',' in tmp or ':' in tmp:
err_msg = _("Port ranges must be numeric")
raise UFWError(err_msg)
if loc == "src":
from_service = tmp
else:
to_service = tmp
try:
rule.set_port(tmp, loc)
except Exception:
raise
else: # pragma: no cover
# This can't normally be reached because of nargs
# checks above, but leave it here in case our parsing
# changes
err_msg = _("Invalid 'port' clause")
raise UFWError(err_msg)
i += 1
# Figure out the type of rule (IPv4, IPv6, or both) this is
if from_type == "any" and to_type == "any":
type = "both"
elif from_type != "any" and to_type != "any" and \
from_type != to_type:
err_msg = _("Mixed IP versions for 'from' and 'to'")
raise UFWError(err_msg)
elif from_type != "any":
type = from_type
elif to_type != "any":
type = to_type
# Adjust protocol
if to_service != "" or from_service != "":
proto = ""
if to_service != "":
try:
proto = ufw.util.get_services_proto(to_service)
except Exception: # pragma: no cover
# This can't normally be reached because of set_port()
# checks above, but leave it here in case our parsing
# changes
err_msg = _("Could not find protocol")
raise UFWError(err_msg)
if from_service != "":
if proto == "any" or proto == "":
try:
proto = ufw.util.get_services_proto(from_service)
except Exception: # pragma: no cover
# This can't normally be reached because of set_port()
# checks above, but leave it here in case our parsing
# changes
err_msg = _("Could not find protocol")
raise UFWError(err_msg)
else:
try:
tmp = ufw.util.get_services_proto(from_service)
except Exception: # pragma: no cover
# This can't normally be reached because of set_port()
# checks above, but leave it here in case our parsing
# changes
err_msg = _("Could not find protocol")
raise UFWError(err_msg)
if proto == "any" or proto == tmp:
proto = tmp
elif tmp == "any":
pass
else:
err_msg = _("Protocol mismatch (from/to)")
raise UFWError(err_msg)
# Verify found proto with specified proto
if rule.protocol == "any":
rule.set_protocol(proto)
elif proto != "any" and rule.protocol != proto:
err_msg = _("Protocol mismatch with specified protocol %s") % \
(rule.protocol)
raise UFWError(err_msg)
# adjust type as needed
if rule:
if rule.protocol in ufw.util.ipv4_only_protocols and \
type == "both":
debug("Adjusting iptype to 'v4' for protocol '%s'" % \
(rule.protocol))
type = "v4"
# Now verify the rule
rule.verify(type)
r = UFWParserResponse(action)
r.data['type'] = self.type
r.data['rule'] = rule
r.data['iptype'] = type
return r
def get_command(r):
'''Get command string for rule'''
res = r.action
if (r.dst == "0.0.0.0/0" or r.dst == "::/0") and \
(r.src == "0.0.0.0/0" or r.src == "::/0") and \
r.sport == "any" and \
r.sapp == "" and \
r.interface_in == "" and \
r.interface_out == "" and \
r.dport != "any":
# Short syntax
if r.direction == "out":
res += " %s" % r.direction
if r.logtype != "":
res += " %s" % r.logtype
if r.dapp != "":
if " " in r.dapp:
res += " '%s'" % r.dapp
else:
res += " %s" % r.dapp
else:
res += " %s" % r.dport
if r.protocol != "any":
res += "/%s" % r.protocol
if r.comment != "":
res += " comment '%s'" % r.get_comment()
else:
# Full syntax
if r.interface_in != "":
res += " in on %s" % r.interface_in
if r.interface_out != "":
res += " out on %s" % r.interface_out
elif r.direction == "out":
res += " %s" % r.direction
if r.logtype != "":
res += " %s" % r.logtype
for i in ['src', 'dst']:
if i == 'src':
loc = r.src
port = r.sport
app = r.sapp
dir = "from"
else:
loc = r.dst
port = r.dport
app = r.dapp
dir = "to"
if loc == "0.0.0.0/0" or loc == "::/0":
loc = "any"
if loc != "any" or port != "any" or app != "":
res += " %s %s" % (dir, loc)
if app != "":
if " " in app:
res += " app '%s'" % app
else:
res += " app %s" % app
elif port != "any":
res += " port %s" % port
# If still haven't added more than action, direction and/or
# logtype, then we have a very generic rule, so add 'to any' to
# mark it as extended form.
if ' to ' not in res and ' from ' not in res and \
r.interface_in == "" and r.interface_out == "":
res += " to any"
if r.protocol != "any" and r.dapp == "" and r.sapp == "":
res += " proto %s" % r.protocol
if r.comment != "":
res += " comment '%s'" % r.get_comment()
return res
get_command = staticmethod(get_command)
class UFWCommandRouteRule(UFWCommandRule):
'''Class for parsing ufw route rule commands'''
def __init__(self, command):
UFWCommandRule.__init__(self, command)
self.type = 'route'
def parse(self, argv):
assert(argv[0] == "route")
# 'ufw delete NUM' is the correct usage, not 'ufw route delete NUM'
if 'delete' in argv:
idx = argv.index('delete')
err_msg = ""
if len(argv) > idx:
try:
int(argv[idx + 1])
err_msg = _("'route delete NUM' unsupported. Use 'delete NUM' instead.")
raise UFWError(err_msg)
except ValueError:
pass
# Let's use as much as UFWCommandRule.parse() as possible. The only
# difference with our rules is that argv[0] is 'route' and we support
# both 'in on <interface>' and 'out on <interface>' in our rules.
# Because UFWCommandRule.parse() expects that the interface clause is
# specified first, strip out the second clause and add it later
rule_argv = None
interface = None
strip = None
# eg: ['route', 'allow', 'in', 'on', 'eth0', 'out', 'on', 'eth1']
s = " ".join(argv)
if " in on " in s and " out on " in s:
strip = "out"
if argv.index("in") > argv.index("out"):
strip = "in"
# Remove 2nd interface clause from argv and add it to the rule
# later. Because we searched for " <strip> on " in our joined
# string we are guaranteed to have argv[argv.index(<strip>) + 2]
# exist.
interface = argv[argv.index(strip) + 2]
rule_argv = argv[0:argv.index(strip)] + argv[argv.index(strip)+3:]
elif not re.search(r' (in|out) on ', s) and \
not re.search(r' app (in|out) ', s) and \
(" in " in s or " out " in s):
# Specifying a direction without an interface doesn't make any
# sense with route rules. application names could be 'in' or 'out'
# so don't artificially limit those names.
err_msg = _("Invalid interface clause for route rule")
raise UFWError(err_msg)
else:
rule_argv = argv
rule_argv[0] = "rule"
r = UFWCommandRule.parse(self, rule_argv)
if 'rule' in r.data:
r.data['rule'].forward = True
if strip and interface:
r.data['rule'].set_interface(strip, interface)
return r
class UFWCommandApp(UFWCommand):
'''Class for parsing ufw application commands'''
def __init__(self, command):
type = 'app'
UFWCommand.__init__(self, type, command)
def parse(self, argv):
'''Parse applications command.'''
name = ""
action = ""
addnew = False
if argv[0] != "app":
raise ValueError()
del argv[0]
nargs = len(argv)
action = argv[0].lower()
if action == "info" or action == "update":
if nargs >= 3 and argv[1] == "--add-new":
addnew = True
argv.remove("--add-new")
nargs = len(argv)
if nargs < 2:
raise ValueError()
# Handle quoted name with spaces in it by stripping Python's ['...']
# list as string text.
name = str(argv[1]).strip("[']")
if addnew:
action += "-with-new"
if action == "list" and nargs != 1:
raise ValueError()
if action == "default":
if nargs < 2:
raise ValueError()
if argv[1].lower() == "allow":
action = "default-allow"
elif argv[1].lower() == "deny":
action = "default-deny"
elif argv[1].lower() == "reject":
action = "default-reject"
elif argv[1].lower() == "skip":
action = "default-skip"
else:
raise ValueError()
r = UFWParserResponse(action)
r.data['type'] = self.type
r.data['name'] = name
return r
class UFWCommandBasic(UFWCommand):
'''Class for parsing ufw basic commands'''
def __init__(self, command):
type = 'basic'
UFWCommand.__init__(self, type, command)
def parse(self, argv):
if len(argv) != 1:
raise ValueError()
return UFWCommand.parse(self, argv)
class UFWCommandDefault(UFWCommand):
'''Class for parsing ufw default commands'''
def __init__(self, command):
type = 'default'
UFWCommand.__init__(self, type, command)
def parse(self, argv):
# Basic sanity check
if len(argv) < 2:
raise ValueError()
# Set the direction
action = ""
direction = "incoming"
if len(argv) > 2:
if argv[2].lower() != "incoming" and \
argv[2].lower() != "input" and \
argv[2].lower() != "routed" and \
argv[2].lower() != "forward" and \
argv[2].lower() != "output" and \
argv[2].lower() != "outgoing":
raise ValueError()
if argv[2].lower().startswith("in"):
direction = "incoming"
elif argv[2].lower().startswith("out"):
direction = "outgoing"
elif argv[2].lower() == "routed" or argv[2].lower() == "forward":
direction = "routed"
else: # pragma: no cover
direction = argv[2].lower()
# Set the policy
if argv[1].lower() == "deny":
action = "default-deny"
elif argv[1].lower() == "allow":
action = "default-allow"
elif argv[1].lower() == "reject":
action = "default-reject"
else:
raise ValueError()
action += "-%s" % (direction)
return UFWParserResponse(action)
class UFWCommandLogging(UFWCommand):
'''Class for parsing ufw logging commands'''
def __init__(self, command):
type = 'logging'
UFWCommand.__init__(self, type, command)
def parse(self, argv):
action = ""
if len(argv) < 2:
raise ValueError()
elif argv[1].lower() == "off":
action = "logging-off"
elif argv[1].lower() == "on" or argv[1].lower() == "low" or \
argv[1].lower() == "medium" or argv[1].lower() == "high" or \
argv[1].lower() == "full":
action = "logging-on"
if argv[1].lower() != "on":
action += "_" + argv[1].lower()
else:
raise ValueError()
return UFWParserResponse(action)
class UFWCommandStatus(UFWCommand):
'''Class for parsing ufw status commands'''
def __init__(self, command):
type = 'status'
UFWCommand.__init__(self, type, command)
def parse(self, argv):
r = UFWCommand.parse(self, argv)
if len(argv) == 1:
r.action = "status"
elif len(argv) > 1:
if argv[1].lower() == "verbose":
r.action = "status-verbose"
elif argv[1].lower() == "numbered":
r.action = "status-numbered"
else:
raise ValueError()
return r
class UFWCommandShow(UFWCommand):
'''Class for parsing ufw show commands'''
def __init__(self, command):
type = 'show'
UFWCommand.__init__(self, type, command)
def parse(self, argv):
action = ""
if len(argv) == 1:
raise ValueError()
elif argv[1].lower() == "raw":
action = "show-raw"
elif argv[1].lower() == "before-rules":
action = "show-before"
elif argv[1].lower() == "user-rules":
action = "show-user"
elif argv[1].lower() == "after-rules":
action = "show-after"
elif argv[1].lower() == "logging-rules":
action = "show-logging"
elif argv[1].lower() == "builtins":
action = "show-builtins"
elif argv[1].lower() == "listening":
action = "show-listening"
elif argv[1].lower() == "added":
action = "show-added"
else:
raise ValueError()
return UFWParserResponse(action)
class UFWParserResponse:
'''Class for ufw parser response'''
def __init__(self, action):
self.action = action.lower()
self.dryrun = False
self.force = False
self.data = {}
def __str__(self):
s = "action='%s'" % (self.action)
keys = list(self.data.keys())
keys.sort()
for i in keys:
s += ",%s='%s'" % (i,self.data[i])
s += "\n"
return repr(s)
class UFWParser:
'''Class for ufw parser'''
def __init__(self):
self.commands = {}
def allowed_command(self, type, cmd):
'''Return command if it is allowed, otherwise raise an exception'''
if type.lower() not in list(self.commands.keys()):
raise ValueError()
if cmd.lower() not in list(self.commands[type].keys()):
raise ValueError()
return cmd.lower()
def parse_command(self, args):
'''Parse command. Returns a UFWParserAction'''
dryrun = False
if len(args) > 0 and args[0].lower() == "--dry-run":
dryrun = True
args.remove(args[0])
force = False
if len(args) > 0 and (args[0].lower() == "--force" or \
args[0].lower() == "-f"):
force = True
args.remove(args[0])
cmd = ""
type = ""
tmp = args[0].lower()
if len(args) > 1 and tmp in list(self.commands.keys()) and \
args[1].lower() in list(self.commands[tmp].keys()):
type = tmp
cmd = args[1].lower()
else:
# Discover the type
cmd = tmp
for i in list(self.commands.keys()):
if cmd in self.commands[i]:
# Skip any inherited commands that inherit from
# UFWCommandRule since they must have more than one
# argument to be valid and used
if isinstance(self.commands[i][cmd], UFWCommandRule) and \
getattr(self.commands[i][cmd], 'type') != 'rule':
continue
type = i
break
if type == "":
type = 'rule'
action = self.allowed_command(type, cmd)
cmd = self.commands[type][action]
response = cmd.parse(args)
response.dryrun = dryrun
response.force = force
return response
def register_command(self, c):
'''Register a command with the parser'''
if c.command == None or c.command == '':
# If the command is empty, then use 'type' as command
key = "%s" % (c.type)
else:
key = "%s" % (c.command)
if c.type not in self.commands:
self.commands[c.type] = {}
if key in self.commands[c.type]:
err_msg = _("Command '%s' already exists") % (key)
raise UFWError(err_msg)
self.commands[c.type][key] = c
|