/usr/share/system-config-audit/audit_rules.py is in system-config-audit 1.7.18-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (C) 2007, 2008, 2009 Red Hat, Inc. All rights reserved.
# This copyrighted material is made available to anyone wishing to use, modify,
# copy, or redistribute it subject to the terms and conditions of the GNU
# General Public License v.2. This program is distributed in the hope that it
# will be useful, but WITHOUT ANY WARRANTY expressed or implied, including the
# implied warranties 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, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
# Floor, Boston, MA 02110-1301, USA. Any Red Hat trademarks that are
# incorporated in the source code or documentation are not subject to the GNU
# General Public License and may only be used or replicated with the express
# permission of Red Hat, Inc.
#
# Red Hat Author: Miloslav Trmac <mitr@redhat.com>
import getopt
from gettext import gettext as _
import grp
import os.path
import pwd
import re
import sys
import audit
import lists
import server
import util
__all__ = ('AuditRules',
'Field', 'FieldType',
'Rule')
# A shorthand
ParsingError = util.ParsingError
class FieldType(object):
'''A rule field type.'''
@staticmethod
def parse_value(string, op, rule):
'''Return a field value parsed from string.
Raise ParsingError on error. The op and rule are parsed to allow more
checking; rule is expected to be used only in _ArchFieldType.
'''
raise NotImplementedError
@staticmethod
def value_text(value):
'''Return a string representing value.'''
raise NotImplementedError
@staticmethod
def hints():
'''Return a list of strings to offer to the user as possible values.'''
return []
@staticmethod
def usual_operators(_):
'''Return a list of operators to offer to the user as most useful.'''
return Field.all_operators
class _UIDFieldType(FieldType):
@staticmethod
def parse_value(string, *unused):
try:
return int(string)
except ValueError:
try:
pw = pwd.getpwnam(string)
except KeyError:
raise ParsingError(_('Unknown user "%s"') % string)
return pw.pw_uid
@staticmethod
def value_text(value):
try:
return pwd.getpwuid(value).pw_name
except KeyError:
return str(value)
@staticmethod
def hints():
return sorted((pw.pw_name for pw in pwd.getpwall()))
@staticmethod
def usual_operators(_):
return (Field.OP_EQ, Field.OP_NE, Field.OP_LT, Field.OP_LE, Field.OP_GE,
Field.OP_GT)
class _GIDFieldType(FieldType):
@staticmethod
def parse_value(string, *unused):
try:
return int(string)
except ValueError:
try:
gr = grp.getgrnam(string)
except KeyError:
raise ParsingError(_('Unknown group "%s"') % string)
return gr.gr_gid
@staticmethod
def value_text(value):
try:
return grp.getgrgid(value).gr_name
except KeyError:
return str(value)
@staticmethod
def hints():
return sorted((gr.gr_name for gr in grp.getgrall()))
@staticmethod
def usual_operators(_):
return (Field.OP_EQ, Field.OP_NE, Field.OP_LT, Field.OP_LE, Field.OP_GE,
Field.OP_GT)
class _MsgTypeFieldType(FieldType):
@staticmethod
def parse_value(string, *_):
return util.parse_msgtype(string)
@staticmethod
def value_text(value):
return util.msgtype_string(value)
@staticmethod
def hints():
return lists.sorted_event_type_names
class _FileTypeFieldType(FieldType):
@staticmethod
def parse_value(string, *_):
return util.parse_filetype(string)
@staticmethod
def value_text(value):
return util.filetype_string(value)
@staticmethod
def hints():
return lists.sorted_file_type_names
@staticmethod
def usual_operators(_):
return (Field.OP_EQ, Field.OP_NE)
class _StringFieldType(FieldType):
@staticmethod
def parse_value(string, *_):
return string
@staticmethod
def value_text(value):
return value
class _FilterKeyFieldType(_StringFieldType):
@staticmethod
def parse_value(string, *unused):
if len(string) > audit.AUDIT_MAX_KEY_LEN:
raise ParsingError(_('Key value "%s" too long') % string)
if util.is_ids_key(string) and util.parse_ids_key(string) is None:
raise ParsingError(_('Invalid IDS key "%s"') % string)
return string
class _ArchFieldType(FieldType):
@staticmethod
def parse_value(string, op, rule):
if rule.syscalls:
raise ParsingError(_('Architecture can not be changed after system '
'calls are selected'))
if op not in (Field.OP_EQ, Field.OP_NE):
raise ParsingError(_('The only valid operators for "%s" are "=" '
'and "!="') %
audit.audit_field_to_name(audit.AUDIT_ARCH))
rule.machine = util.parse_elf(string)
return string
@staticmethod
def value_text(value):
return value
@staticmethod
def hints():
return lists.sorted_machine_names
@staticmethod
def usual_operators(_):
return (Field.OP_EQ, Field.OP_NE)
class _PermFieldType(FieldType):
@staticmethod
def parse_value(string, op, *unused):
if op != Field.OP_EQ:
raise ParsingError(_('The only valid operator for "%s" is "="') %
audit.audit_field_to_name(audit.AUDIT_PERM))
val = 0
for c in string:
if c == 'r':
val |= audit.AUDIT_PERM_READ
elif c == 'w':
val |= audit.AUDIT_PERM_WRITE
elif c == 'x':
val |= audit.AUDIT_PERM_EXEC
elif c == 'a':
val |= audit.AUDIT_PERM_ATTR
else:
raise ParsingError(_('Unknown permission "%(char)c" in '
'"%(perms)s"') %
{'char': c, 'perms': string})
return val
@staticmethod
def value_text(value):
s = []
if (value & audit.AUDIT_PERM_READ) != 0:
s.append('r')
if (value & audit.AUDIT_PERM_WRITE) != 0:
s.append('w')
if (value & audit.AUDIT_PERM_EXEC) != 0:
s.append('x')
if (value & audit.AUDIT_PERM_ATTR) != 0:
s.append('a')
return ''.join(s)
@staticmethod
def usual_operators(_):
return (Field.OP_EQ)
class _IntFieldType(FieldType):
@staticmethod
def parse_value(string, *unused):
try:
return int(string)
except ValueError:
raise ParsingError(_('Invalid integer value "%s"') % string)
@staticmethod
def value_text(value):
return str(value)
@staticmethod
def usual_operators(var):
if var in (audit.AUDIT_ARG0, audit.AUDIT_ARG1, audit.AUDIT_ARG2,
audit.AUDIT_ARG3):
return Field.all_operators
else:
return (Field.OP_EQ, Field.OP_NE, Field.OP_LT, Field.OP_LE,
Field.OP_GE, Field.OP_GT)
class _InodeFieldType(_IntFieldType):
@staticmethod
def parse_value(string, op, *unused):
if op not in (Field.OP_EQ, Field.OP_NE):
raise ParsingError(_('The only valid operators for "%s" are "=" '
'and "!="') %
audit.audit_field_to_name(audit.AUDIT_INODE))
return _IntFieldType.parse_value(string)
@staticmethod
def usual_operators(_):
return (Field.OP_EQ, Field.OP_NE)
class Field(object):
'''A single rule field.'''
OP_EQ = '='
OP_GE = '>='
OP_GT = '>'
OP_LE = '<='
OP_LT = '<'
OP_MASK = '&'
OP_NE = '!='
OP_TEST = '&='
# Uses an user-friendly order
all_operators = (OP_EQ, OP_NE, OP_LT, OP_LE, OP_GE, OP_GT, OP_MASK, OP_TEST)
def __init__(self):
self.var = None # audit.AUDIT_*
self.op = None # Usable as an user-readable representation
self.value = None
__field_type_map = {
audit.AUDIT_ARCH: _ArchFieldType,
audit.AUDIT_DIR: _StringFieldType,
audit.AUDIT_EGID: _GIDFieldType, audit.AUDIT_EUID: _UIDFieldType,
audit.AUDIT_FILETYPE: _FileTypeFieldType,
audit.AUDIT_FILTERKEY: _FilterKeyFieldType,
audit.AUDIT_FSGID: _GIDFieldType, audit.AUDIT_FSUID: _UIDFieldType,
audit.AUDIT_GID: _GIDFieldType,
audit.AUDIT_INODE: _InodeFieldType,
audit.AUDIT_LOGINUID: _UIDFieldType,
audit.AUDIT_MSGTYPE: _MsgTypeFieldType,
audit.AUDIT_OBJ_LEV_HIGH: _StringFieldType,
audit.AUDIT_OBJ_LEV_LOW: _StringFieldType,
audit.AUDIT_OBJ_ROLE: _StringFieldType,
audit.AUDIT_OBJ_TYPE: _StringFieldType,
audit.AUDIT_OBJ_USER: _StringFieldType,
audit.AUDIT_PERM: _PermFieldType,
audit.AUDIT_SGID: _GIDFieldType,
audit.AUDIT_SUBJ_ROLE: _StringFieldType,
audit.AUDIT_SUBJ_SEN: _StringFieldType,
audit.AUDIT_SUBJ_TYPE: _StringFieldType,
audit.AUDIT_SUBJ_USER: _StringFieldType,
audit.AUDIT_SUID: _UIDFieldType,
audit.AUDIT_UID: _UIDFieldType,
audit.AUDIT_WATCH: _StringFieldType,
}
@classmethod
def get_field_type(cls, field):
'''Return a FieldType for the specified field.'''
return cls.__field_type_map.get(field, _IntFieldType)
__op_name_map = { '!=': OP_NE, '=': OP_EQ, '&': OP_MASK, '&=': OP_TEST,
'<': OP_LT, '<=': OP_LE, '>': OP_GT, '>=': OP_GE }
def parse_triple(self, var_name, op_name, value, rule = None):
'''Parse the rule from elements.
Raise ParsingError on error. The object state is undefined after an
error. rule may be omitted if var_name never specifies
audit.AUDIT_ARCH.
'''
try:
self.var = audit.audit_name_to_field(var_name)
except OSError:
raise ParsingError(_('Unknown field "%s"') % var_name)
try:
self.op = self.__op_name_map[op_name]
except KeyError:
raise ParsingError(_('Unknown operator "%s"') % op_name)
self.value = self.get_field_type(self.var).parse_value(value, self.op,
rule)
def parse(self, string, rule):
'''Parse the rule from a string representation.
Raise ParsingError on error. The object state is undefined after an
error.
'''
# To avoid ambiguities, check the longest operators first.
for op in sorted(self.__op_name_map.iterkeys(), key = len,
reverse = True):
i = string.find(op)
if i != -1:
(var, value) = (string[:i], string[(i + len(op)):])
break
else:
raise ParsingError(_('Operator missing in "%s"') % string)
self.parse_triple(var, op, value, rule)
def parse_special(self, var, string):
'''Parse a special-cased parameter for var = string.
Raise ParsingError on error. The object state is undefined after an
error.
'''
self.var = var
self.op = self.OP_EQ
self.value = self.get_field_type(self.var).parse_value(string, self.op)
def option_text(self, rule):
'''Return a string representing this field as an auditctl option.
Use rule to determine the correct syntax.
'''
val = self._value_text()
if self.var == audit.AUDIT_FILTERKEY:
assert self.op == self.OP_EQ
return '-k %s' % val
elif (self.var == audit.AUDIT_PERM and
len([f for f in rule.fields
if f.var in (audit.AUDIT_DIR, audit.AUDIT_WATCH)]) == 1):
assert self.op == self.OP_EQ
return '-p %s' % val
else:
return '-F %s%s%s' % (audit.audit_field_to_name(self.var), self.op,
val)
def user_text(self):
'''Return an user-readable string representing this field.'''
return '%s %s %s' % (audit.audit_field_to_name(self.var), self.op,
self._value_text())
def _value_text(self):
'''Return a string representing self.value.'''
return self.get_field_type(self.var).value_text(self.value)
def __eq__(self, field):
if type(field) is not Field:
return NotImplemented
return (self.var == field.var and self.op == field.op and
self.value == field.value)
def __ne__(self, field):
return not self.__eq__(field)
class Rule(object):
'''A single audit rule.'''
ACTION_ALWAYS = 'always'
ACTION_NEVER = 'never'
SYSCALLS_ALL = 'all'
def __init__(self):
self.action = None
self.fields = []
# The machine type used for system calls in this rule
self.machine = util.audit_machine_id
# System call numbers. May include the special value SYSCALLS_ALL.
self.syscalls = []
def validate(self, list, rules):
'''Validate the rule, for usage within list in rules.
Raise ParsingError on error.
'''
for var in (field.var for field in self.fields):
if list is rules.exclude_rules and var != audit.AUDIT_MSGTYPE:
raise ParsingError('Field type "%s" is invalid in "exclude" '
'rules' % audit.audit_field_to_name(var))
if list is not rules.exclude_rules and var == audit.AUDIT_MSGTYPE:
raise ParsingError('Field type "%s" is valid only "exclude" '
'rules' % audit.audit_field_to_name(var))
if (list is not rules.exit_rules and
var in (audit.AUDIT_DIR, audit.AUDIT_OBJ_USER,
audit.AUDIT_OBJ_ROLE, audit.AUDIT_OBJ_TYPE,
audit.AUDIT_OBJ_LEV_LOW, audit.AUDIT_OBJ_LEV_HIGH,
audit.AUDIT_WATCH)):
raise ParsingError('Field type "%s" is valid only in system '
'call exit and watch rules' %
audit.audit_field_to_name(var))
if (list is rules.entry_rules and
var in (audit.AUDIT_DEVMAJOR, audit.AUDIT_DEVMINOR,
audit.AUDIT_INODE, audit.AUDIT_EXIT,
audit.AUDIT_SUCCESS)):
raise ParsingError('Field type "%s" is not valid in system '
'call entry rules' %
audit.audit_field_to_name(var))
if list is rules.exclude_rules and len(self.fields) > 1:
# FIXME: this is to avoid -F msgtype=1 -F msgtype=2 not doing the
# right thing, but it prevents range expressions from working
raise ParsingError('Only one field is allowed in "exclude" rules')
keys = (field.value for field in self.fields
if field.var == audit.AUDIT_FILTERKEY)
if len('\x01'.join(keys)) > audit.AUDIT_MAX_KEY_LEN:
raise ParsingError('Total key length is too long')
# FIXME: more checks?
def command_text(self, rules, list, list_name):
'''Represent self as a string within a list with list_name in rules.'''
o = []
used_fields = set(field.var for field in self.fields)
watches = [field for field in self.fields
if field.var in (audit.AUDIT_DIR, audit.AUDIT_WATCH)]
if (list is rules.exit_rules and
self.syscalls == [self.SYSCALLS_ALL] and
used_fields.issubset(set((audit.AUDIT_DIR, audit.AUDIT_FILTERKEY,
audit.AUDIT_PERM, audit.AUDIT_WATCH))) and
len(watches) == 1 and watches[0].op == Field.OP_EQ):
o.append('-w %s' % watches[0].value)
watch_used = True
else:
o.append('-a %s,%s' % (list_name, self.action))
watch_used = False
# Add fields before syscalls because -F arch=... may change the meaning
# of syscall names. But add AUDIT_FILTERKEY only after -S, auditctl
# stubbornly insists on that order.
for f in self.fields:
if (f.var != audit.AUDIT_FILTERKEY and
(f.var not in (audit.AUDIT_DIR, audit.AUDIT_WATCH) or
not watch_used)):
o.append(f.option_text(self))
# exclude_rules and user_rules are not syscall related. -w implies
# -S all.
if (list is not rules.exclude_rules and
list is not rules.user_rules and not watch_used):
for s in self.syscalls:
if s == self.SYSCALLS_ALL:
o.append('-S all')
else:
o.append('-S %s' % util.syscall_string(s, self.machine))
for f in self.fields:
if f.var == audit.AUDIT_FILTERKEY:
o.append(f.option_text(self))
return ' '.join(o)
def __eq__(self, rule):
if type(rule) is not Rule:
return NotImplemented
if (self.action != rule.action or
len(self.fields) != len(rule.fields) or
self.machine != rule.machine or
set(self.syscalls) != set(rule.syscalls)):
return False
for i in xrange(len(self.fields)):
if self.fields[i] != rule.fields[i]: # See Field.__eq__
return False
return True
def __ne__(self, rule):
return not self.__eq__(rule)
class AuditRules(object):
'''Audit rules and kernel config file.'''
AUDIT_DISABLED = '0'
AUDIT_ENABLED = '1'
AUDIT_LOCKED = '2'
FAILURE_SILENT = '0'
FAILURE_PRINTK = '1'
FAILURE_PANIC = '2'
RATE_LIMIT_DISABLED = 0
# __slots__ is used to make sure __eq__ doesn't miss anything. The space
# savings, if any, are not really important.
__rule_list_slots = ('entry_rules', 'exclude_rules', 'exit_rules',
'task_rules',
'user_rules')
__primitive_slots = ('audit_enabled',
'backlog_limit',
'failure_handling',
'rate_limit')
__slots__ = __primitive_slots + __rule_list_slots
def __init__(self):
# The kernel default may be changed using a command line option. It is
# not actually relevant, because auditd is started before audit.rules
# are loaded and auditd always enables auditing.
self.audit_enabled = self.AUDIT_ENABLED
self.backlog_limit = 64
self.failure_handling = self.FAILURE_PRINTK
self.rate_limit = self.RATE_LIMIT_DISABLED
self.__empty_rule_lists()
def __empty_rule_lists(self):
for attr in self.__rule_list_slots:
setattr(self, attr, [])
def __interpret_line(self, args):
'''Handle a single configuration file command.
Raise ParsingError on error.
'''
try:
(opts, arguments) = \
getopt.getopt(args, 'A:DF:S:W:a:b:d:e:f:ihlk:m:p:r:sw:')
except getopt.error, e:
raise ParsingError(e.msg)
if arguments:
raise ParsingError('Unexpected non-option arguments "%s"' %
' '.join(arguments))
rule = Rule()
rule_operation = None
rule_list = None
for (opt, arg) in opts:
if opt in ('-A', '-a', '-d'):
if rule.action is not None:
raise ParsingError('Action already specified for a rule')
i = arg.find(',')
if i == -1:
raise ParsingError('Missing comma in "%s"' % arg)
(dest, action) = (arg[:i], arg[i + 1:])
if dest == 'task':
rule_list = self.task_rules
elif dest == 'entry':
rule_list = self.entry_rules
elif dest == 'exit':
rule_list = self.exit_rules
elif dest == 'user':
rule_list = self.user_rules
elif dest == 'exclude':
rule_list = self.exclude_rules
else:
raise ParsingError('Unknown rule list "%s"' % dest)
if action == 'never':
rule.action = Rule.ACTION_NEVER
elif action == 'always':
rule.action = Rule.ACTION_ALWAYS
elif action == 'possible':
raise ParsingError('Rule action "possible" is deprecated')
else:
raise ParsingError('Unknown rule action "%s"' % action)
rule_operation = opt
elif opt == '-D':
self.__empty_rule_lists()
elif opt == '-F':
field = Field()
# This may have the nasty side effect of changing rule.machine
field.parse(arg, rule)
rule.fields.append(field)
elif opt == '-S':
if arg == 'all':
sc = Rule.SYSCALLS_ALL
else:
sc = util.parse_syscall(arg, rule.machine)
if sc not in rule.syscalls:
rule.syscalls.append(sc)
elif opt == '-W' or opt == '-w':
if rule.action is not None:
raise ParsingError('Action already specified for a rule')
if (set(field.var for field in rule.fields).
intersection((audit.AUDIT_DIR, audit.AUDIT_WATCH))):
raise ParsingError('Two paths specified for a rule')
rule.action = Rule.ACTION_ALWAYS
field = Field()
if os.path.isdir(arg):
field.parse_special(audit.AUDIT_DIR, arg)
else:
field.parse_special(audit.AUDIT_WATCH, arg)
rule.fields.append(field)
if opt == '-W':
rule_operation = '-d'
else:
rule_operation = '-a'
rule_list = self.exit_rules
elif opt == '-b':
self.backlog_limit = util.parse_unsigned(arg)
elif opt == '-e':
if arg == '0':
self.audit_enabled = self.AUDIT_DISABLED
elif arg == '1':
self.audit_enabled = self.AUDIT_ENABLED
elif arg == '2':
self.audit_enabled = self.AUDIT_LOCKED
else:
raise ParsingError('Invalid value "%s" of option -e' % arg)
elif opt == '-f':
if arg == '0':
self.failure_handling = self.FAILURE_SILENT
elif arg == '1':
self.failure_handling = self.FAILURE_PRINTK
elif arg == '2':
self.failure_handling = self.FAILURE_PANIC
else:
raise ParsingError('Invalid value "%s" of option -f' % arg)
elif opt == '-h' or opt == '-i' or opt == '-l':
pass # Ignore
elif opt == '-k':
# This will be ignored if -k is used with -l or -D.
field = Field()
field.parse_special(audit.AUDIT_FILTERKEY, arg)
rule.fields.append(field)
elif opt == '-m':
pass # Ignore
elif opt == '-p':
field = Field()
field.parse_special(audit.AUDIT_PERM, arg)
for i in xrange(len(rule.fields)):
if rule.fields[i].var == audit.AUDIT_PERM:
rule.fields[i] = field
break
else:
rule.fields.append(field)
elif opt == '-r':
self.rate_limit = util.parse_unsigned(arg)
elif opt == '-s':
pass # Ignore
if rule_list is not None:
if rule.syscalls:
if rule_list is self.task_rules:
raise ParsingError('System calls cannot be used in task '
'rules')
if rule_list is self.user_rules:
raise ParsingError('System calls cannot be used in user '
'rules')
if rule_list is self.exclude_rules:
raise ParsingError('System calls cannot be used in '
'exclude rules')
if rule_list is not self.task_rules and not rule.syscalls:
rule.syscalls.append(Rule.SYSCALLS_ALL)
rule.validate(rule_list, self)
for i in xrange(len(rule_list)):
if rule_list[i] == rule: # See Rule.__eq__
same = i
break
else:
same = None
if rule_operation in ('-a', '-A'):
if same is not None:
raise ParsingError('The same rule already exists in this '
'list')
if rule_operation == '-a':
rule_list.append(rule)
else:
rule_list.insert(0, rule)
elif rule_operation == '-d':
if same is None:
raise ParsingError('The rule does not exist in the list')
del rule_list[same]
__whitespace_re = re.compile(' +')
def read(self, client):
'''Read the auditd configuration file using client.
Raise IOError on error. Invalid lines are reported on stderr (in
English), but otherwise ignored.
'''
contents = client.read_file(server.FILE_AUDIT_RULES)
line_no = 0
for line in contents.splitlines():
line_no += 1
line = line.strip(' ')
if not line:
continue
if line.startswith('#'):
continue
try:
self.__interpret_line(self.__whitespace_re.split(line))
except ParsingError, e:
print >> sys.stderr, "audit.rules:%d: %s" % (line_no, str(e))
def write(self, client):
'''Write current state to the auditd configuration file using client.
Raise IOError on error.
'''
# Unlike AuditdConfig, we don't try to preserve the original structure
# and comments in audit.rules. The structure less simple, and rule
# order matters, so the heuristic would have to be rather complex and
# fragile. Maybe sometime later.
lines = []
if self.audit_enabled != self.AUDIT_LOCKED:
lines.append('-e %s' % self.audit_enabled)
else:
lines.append('-e %s' % self.AUDIT_ENABLED)
lines += ['-f %s' % self.failure_handling,
'-b %d' % self.backlog_limit,
'-r %d' % self.rate_limit,
'',
'-D']
for (rules, list_name) in ((self.entry_rules, 'entry'),
(self.exclude_rules, 'exclude'),
(self.exit_rules, 'exit'),
(self.task_rules, 'task'),
(self.user_rules, 'user')):
for r in rules:
lines.append(r.command_text(self, rules, list_name))
if self.audit_enabled == self.AUDIT_LOCKED:
lines.append('-e %s' % self.audit_enabled)
contents = '\n'.join(lines) + '\n'
client.write_file(server.FILE_AUDIT_RULES, contents)
def __eq__(self, rules):
if type(rules) is not AuditRules:
return NotImplemented
for attr in self.__primitive_slots:
if getattr(self, attr) != getattr(rules, attr):
return False
for attr in self.__rule_list_slots:
l0 = getattr(self, attr)
l1 = getattr(rules, attr)
if len(l0) != len(l1):
return False
for i in xrange(len(l0)):
if l0[i] != l1[i]: # See Rule.__ne__
return False
return True
def __ne__(self, rules):
return not self.__eq__(rules)
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