This allows manipulation of key credential links for users.
See `man -l bin/default/docs-xml/manpages/samba-tool.8` for
documentation.
Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
from .edit import cmd_user_edit
from .enable import cmd_user_enable
from .getgroups import cmd_user_getgroups
+from .keytrust import cmd_user_keytrust
from .list import cmd_user_list
from .move import cmd_user_move
from .password import cmd_user_password
subcommands["delete"] = cmd_user_delete()
subcommands["disable"] = cmd_user_disable()
subcommands["enable"] = cmd_user_enable()
+ subcommands["keytrust"] = cmd_user_keytrust()
subcommands["list"] = cmd_user_list()
subcommands["setexpiry"] = cmd_user_setexpiry()
subcommands["password"] = cmd_user_password()
--- /dev/null
+# samba-tool commands to manager Key Credential Links on a user
+#
+# Copyright © Douglas Bagnall <dbagnall@samba.org> 2025
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# 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/>.
+
+import ldb
+import samba.getopt as options
+from samba.domain.models import User
+from samba.domain.models.exceptions import ModelError
+from samba.netcmd import Command, CommandError, Option, SuperCommand
+from samba.netcmd import exception_to_command_error
+from samba.key_credential_link import (create_key_credential_link,
+ kcl_in_list,
+ filter_kcl_list)
+
+
+class cmd_user_keycredentiallink_add(Command):
+ """Add a key-credential-link."""
+
+ synopsis = "%prog <username> [options] <pubkey>"
+
+ takes_args = ["username", "pubkey"]
+
+ takes_optiongroups = {
+ "sambaopts": options.SambaOptions,
+ "credopts": options.CredentialsOptions,
+ "hostopts": options.HostOptions,
+ }
+
+ takes_options = [
+ Option("--link-target", metavar="DN",
+ help="link to this DN (default: this user's DN)"),
+ Option("--encoding", default='auto', choices=('pem', 'der', 'auto'),
+ help="Key format (optional)"),
+ Option("--force", default=False, action='store_true',
+ help="proceed with operations that seems ill-fated"),
+ ]
+
+ @exception_to_command_error(ValueError, ModelError, FileNotFoundError)
+ def run(self, username, pubkey,
+ hostopts=None, sambaopts=None, credopts=None,
+ link_target=None, encoding='auto', force=False):
+
+ samdb = self.ldb_connect(hostopts, sambaopts, credopts)
+ user = User.find(samdb, username)
+
+ if link_target is None:
+ link_target = user.dn
+
+ with open(pubkey, 'rb') as f:
+ data = f.read()
+
+ try:
+ link = create_key_credential_link(samdb,
+ link_target,
+ data,
+ encoding=encoding,
+ force=force)
+ except ldb.LdbError as e:
+ # with --force, we will end up with CONSTRAINT_VIOLATION
+ # at user.save(), rather than NO_SUCH_OBJECT now.
+ if e.args[0] == ldb.ERR_NO_SUCH_OBJECT:
+ raise CommandError(f"Link target '{link_target}' does not exist")
+ raise
+
+ if not force and kcl_in_list(link, user.key_credential_link):
+ # It is not allowed to have duplicate linked attributes,
+ # which in the case of key credential links means having
+ # the same key blob and the same DN target.
+ #
+ # It is still possible to have the same key material and
+ # DN target if other fields (e.g. creation date) in the
+ # blob differ. The creation date is set with one second
+ # resolution in create_key_credential_link() just above,
+ # which puts us in the awkward position of creating a race
+ # if people are running samba-tool in a script.
+ #
+ # While the uniqueness invariant is a feature of AD/DSDB,
+ # not of key credential links, duplicates are not going to
+ # be useful, so we try to avoid this by checking first
+ # unless --force is used.
+ #
+ # if --force is used to add a key for the second time in
+ # the same second, user.save() below will raise an
+ # ERR_ATTRIBUTE_OR_VALUE_EXISTS LdbError.
+ raise CommandError(f"User {username} "
+ "already has this key credential link")
+
+ user.key_credential_link.append(link)
+ user.save(samdb)
+
+
+class cmd_user_keycredentiallink_delete(Command):
+ """Delete a key-credential-link."""
+
+ synopsis = "%prog <username> [options]"
+
+ takes_args = ["username"]
+
+ takes_options = [
+ Option("--link-target", metavar="DN",
+ help="Delete this key credential link (a DN)"),
+ Option("--fingerprint", metavar="HH:HH:..",
+ help="Delete the key credential link with this key fingerprint"),
+ Option("--all", action='store_true',
+ help="Delete all key credential links"),
+ Option("-n", "--dry-run", action='store_true',
+ help="Do nothing but print what would happen"),
+ ]
+
+ takes_optiongroups = {
+ "sambaopts": options.SambaOptions,
+ "credopts": options.CredentialsOptions,
+ "hostopts": options.HostOptions,
+ }
+
+ @exception_to_command_error(ValueError, ModelError)
+ def run(self, username, hostopts=None, sambaopts=None, credopts=None,
+ link_target=None, fingerprint=None, all=False, dry_run=False):
+
+ samdb = self.ldb_connect(hostopts, sambaopts, credopts)
+ user = User.find(samdb, username)
+
+ keycredlinks = user.key_credential_link
+
+ if all:
+ goners = keycredlinks
+ else:
+ goners = filter_kcl_list(samdb,
+ keycredlinks,
+ link_target=link_target,
+ fingerprint=fingerprint)
+
+ keepers = [x for x in keycredlinks if x not in goners]
+ nk = len(keepers)
+
+ if dry_run:
+ self.message("Without --dry-run, this would happen:")
+ if not goners:
+ self.message("NO key credential links are deleted")
+ for x in goners:
+ self.message(f"DELETE {x} (fingerprint {x.fingerprint()})")
+ self.message('')
+ for x in keepers:
+ self.message(f"KEEP {x} (fingerprint {x.fingerprint()})")
+
+ self.message(f"{username} would now have {nk} key credential link"
+ f"{'' if nk == 1 else 's'}")
+ return
+
+ if not goners:
+ # fail without traceback if the filter matches no links
+ raise CommandError("no key credential links deleted")
+
+ user.key_credential_link = keepers
+ user.save(samdb)
+
+ for x in goners:
+ self.message(f"Deleted {x} (fingerprint {x.fingerprint()})")
+ self.message('')
+ for x in keepers:
+ self.message(f"Keeping {x} (fingerprint {x.fingerprint()})")
+
+ self.message(f"{username} now has {nk} key credential link"
+ f"{'' if nk == 1 else 's'}")
+
+
+class cmd_user_keycredentiallink_view(Command):
+ """View a user's key credential links."""
+ synopsis = "%prog <username> [options]"
+
+ takes_args = ["username"]
+
+ takes_options = [
+ Option("-v", "--verbose", help="Be verbose", action="store_true"),
+ ]
+
+ takes_optiongroups = {
+ "sambaopts": options.SambaOptions,
+ "credopts": options.CredentialsOptions,
+ "hostopts": options.HostOptions,
+ }
+
+ @exception_to_command_error(ValueError, ModelError)
+ def run(self, username, hostopts=None, sambaopts=None, credopts=None,
+ verbose=False):
+
+ samdb = self.ldb_connect(hostopts, sambaopts, credopts)
+ user = User.find(samdb, username)
+
+ if verbose:
+ verbosity = 3
+ else:
+ verbosity = 2
+
+ n = len(user.key_credential_link)
+ self.message(f"{username} has {n} key credential link"
+ f"{'' if n == 1 else 's'}\n")
+
+ for kcl in user.key_credential_link:
+ self.message(kcl.description(verbosity), '')
+
+
+class cmd_user_keytrust(SuperCommand):
+ """Manage key-credential links on a user."""
+
+ subcommands = {
+ "add": cmd_user_keycredentiallink_add(),
+ "delete": cmd_user_keycredentiallink_delete(),
+ "view": cmd_user_keycredentiallink_view(),
+ }
--- /dev/null
+# Unix SMB/CIFS implementation.
+#
+# Tests for `samba-tool user keytrust`
+#
+# Copyright © Douglas Bagnall <dbagnall@samba.org> 2025
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# 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/>.
+#
+
+import os
+from pathlib import Path
+
+from samba.domain.models import User
+from samba.tests.samba_tool.base import SambaToolCmdTest
+from samba import key_credential_link as kcl
+
+
+HOST = "ldap://{DC_SERVER}".format(**os.environ)
+CREDS = "-U{DC_USERNAME}%{DC_PASSWORD}".format(**os.environ)
+
+ROOT = (Path(__file__) / '../../../../../').resolve()
+TESTDATA = ROOT / 'testdata' / 'keytrust'
+
+GOOD_CERTS = [
+ str(TESTDATA / 'cert-rsa-2048.pem'),
+ str(TESTDATA / 'ca-cert-rsa-2048.pem'),
+]
+
+WRONG_SIZE_CERTS = [
+ str(TESTDATA / 'cert-rsa-1024.pem'),
+ str(TESTDATA / 'ca-cert-rsa-4096.pem'),
+]
+
+NON_RSA_CERTS = [
+ str(TESTDATA / 'ca-cert-ecdsa-p256.pem'),
+]
+
+GOOD_KEYS = [
+ str(TESTDATA / 'rsa2048-pkcs1.der'),
+ str(TESTDATA / 'rsa2048b-spki.pem'),
+]
+
+DUPLICATE_KEYS = [
+ str(TESTDATA / 'cert-rsa-2048.pem'),
+ str(TESTDATA / 'public-key-from-cert-rsa-2048-pkcs1.pem'),
+]
+
+
+class SambaToolUserKeyTrustTest(SambaToolCmdTest):
+ @classmethod
+ def setUpClass(cls):
+ super().setUpClass()
+ cls.samdb = cls.getSamDB("-H", HOST, CREDS)
+ cls.runcmd("user", "key-trust", "delete",
+ "-H", HOST, CREDS,
+ 'joe', '--all')
+ cls.runcmd("user", "key-trust", "delete",
+ "-H", HOST, CREDS,
+ 'alice', '--all')
+
+ def get_links(self, username):
+ result = self.samdb.search(expression=f'sAMAccountName={username}',
+ attrs=['msDS-KeyCredentialLink'])
+ self.assertEqual(len(result), 1)
+ links = result[0].get('msDS-KeyCredentialLink', [])
+ return [kcl.KeyCredentialLinkDn(self.samdb, v) for v in links]
+
+ def test_add_good_cert(self):
+ """These ones should just succeed."""
+ links = self.get_links('joe')
+ n = len(links)
+ for f in GOOD_CERTS:
+ result, out, err = self.runcmd("user", "key-trust", "add",
+ "-H", HOST, CREDS,
+ 'joe', f)
+ self.assertCmdSuccess(result, out, err)
+
+ n += 1
+ links = self.get_links('joe')
+ self.assertEqual(len(links), n)
+
+ result, out, err = self.runcmd("user", "key-trust", "delete",
+ "-H", HOST, CREDS,
+ 'joe', '--all')
+ self.assertCmdSuccess(result, out, err)
+
+ for link in links:
+ self.assertIn(f"Deleted {link}", out)
+
+ links = self.get_links('joe')
+ self.assertEqual(links, [])
+
+ def test_add_and_delete_good_keys(self):
+ """Add known good keys, and also check the view and delete commands."""
+ links = self.get_links('alice')
+ self.assertEqual(links, [])
+
+ result, out, err = self.runcmd("user", "key-trust", "add",
+ "-H", HOST, CREDS,
+ 'alice', GOOD_KEYS[0])
+ self.assertCmdSuccess(result, out, err)
+ links = self.get_links('alice')
+ self.assertEqual(len(links), 1)
+
+ result, out, err = self.runcmd("user", "key-trust", "view",
+ "-H", HOST, CREDS,
+ 'alice')
+ self.assertCmdSuccess(result, out, err)
+ self.assertIn('alice has 1 key credential link\n', out)
+ self.assertIn('Link target: CN=alice,CN=Users,DC=addom,DC=samba,DC=example,DC=com\n', out)
+ self.assertIn('Number of key entries: 5', out)
+
+ result, out, err = self.runcmd("user", "key-trust", "add",
+ "-H", HOST, CREDS,
+ 'alice', GOOD_KEYS[1])
+ self.assertCmdSuccess(result, out, err)
+ result, out, err = self.runcmd("user", "key-trust", "view",
+ "-H", HOST, CREDS,
+ 'alice', '--verbose')
+ self.assertCmdSuccess(result, out, err)
+ self.assertIn('alice has 2 key credential links\n', out)
+
+ links = self.get_links('alice')
+ fingerprints = [('16:CD:1B:C2:7A:0B:FC:C9:4B:95:11:9F:AD:97:EC:1B:'
+ 'ED:BD:64:91:42:2E:AF:CA:CB:1E:C3:EE:86:6D:F1:5A'),
+ ('86:61:6D:B2:6A:3A:04:BD:E0:59:10:13:21:9A:2B:2C:'
+ 'C4:FD:CE:50:05:16:3C:66:1B:38:63:79:8C:B1:DA:17')]
+
+ self.assertEqual(set(x.fingerprint() for x in links),
+ set(fingerprints))
+
+ # test delete --dry-run / -n
+ result, out, err = self.runcmd("user", "key-trust", "delete",
+ "-H", HOST, CREDS,
+ 'alice', '--all', '-n')
+ self.assertCmdSuccess(result, out, err)
+ self.assertIn('Without --dry-run, this would happen:\n', out)
+ self.assertIn(f'DELETE {links[0]} (fingerprint {links[0].fingerprint()})',
+ out)
+ self.assertIn(f'DELETE {links[1]} (fingerprint {links[1].fingerprint()})',
+ out)
+ self.assertNotIn('KEEP', out)
+ self.assertIn('alice would now have 0 key credential links\n', out)
+
+ result, out, err = self.runcmd("user", "key-trust", "delete",
+ "-H", HOST, CREDS,
+ 'alice', '--fingerprint=whatever',
+ '--dry-run')
+ self.assertCmdSuccess(result, out, err)
+ self.assertIn('NO key credential links are deleted\n', out)
+
+ self.assertIn(f'KEEP {links[0]} (fingerprint {links[0].fingerprint()})',
+ out)
+ self.assertIn(f'KEEP {links[1]} (fingerprint {links[1].fingerprint()})',
+ out)
+ self.assertIn('alice would now have 2 key credential links\n', out)
+
+ result, out, err = self.runcmd("user", "key-trust", "delete",
+ "-H", HOST, CREDS,
+ 'alice',
+ '--fingerprint',
+ fingerprints[1],
+ '--dry-run')
+ self.assertCmdSuccess(result, out, err)
+ self.assertIn(f'DELETE {links[1]} (fingerprint {links[1].fingerprint()})',
+ out)
+ self.assertIn(f'KEEP {links[0]} (fingerprint {links[0].fingerprint()})',
+ out)
+ self.assertIn('alice would now have 1 key credential link\n', out)
+
+ # this time deleting for real
+ result, out, err = self.runcmd("user", "key-trust", "delete",
+ "-H", HOST, CREDS,
+ 'alice', '--all')
+ self.assertCmdSuccess(result, out, err)
+ links = self.get_links('alice')
+ self.assertEqual(links, [])
+
+ result, out, err = self.runcmd("user", "key-trust", "view",
+ "-H", HOST, CREDS,
+ 'alice')
+ self.assertCmdSuccess(result, out, err)
+ self.assertIn('alice has 0 key credential links\n', out)
+
+ def test_add_duplicate_keys(self):
+ """You should not be able to add the same link twice."""
+
+ self.addCleanup(self.runcmd, "user", "key-trust", "delete",
+ "-H", HOST, CREDS,
+ 'alice', '--all')
+
+ result, out, err = self.runcmd("user", "key-trust", "add",
+ "-H", HOST, CREDS,
+ 'alice', DUPLICATE_KEYS[0])
+ self.assertCmdSuccess(result, out, err)
+
+ # This source file is different, but contains the same public
+ # key. samba-tool should notice this and fail *before* it
+ # fails in the dsdb layer with ERR_ATTRIBUTE_OR_VALUE_EXISTS
+ result, out, err = self.runcmd("user", "key-trust", "add",
+ "-H", HOST, CREDS,
+ 'alice', DUPLICATE_KEYS[1])
+ self.assertCmdFail(result)
+ self.assertNotIn('ATTRIBUTE_OR_VALUE_EXISTS', err)
+
+ # adding the first file again should also fail.
+ result, out, err = self.runcmd("user", "key-trust", "add",
+ "-H", HOST, CREDS,
+ 'alice', DUPLICATE_KEYS[0])
+ self.assertCmdFail(result)
+
+ # adding to a different DN is OK
+ base_dn = self.samdb.domain_dn()
+ result, out, err = self.runcmd("user", "key-trust", "add",
+ "-H", HOST, CREDS,
+ "--link-target", base_dn,
+ 'alice', DUPLICATE_KEYS[1])
+ self.assertCmdSuccess(result, out, err)
+
+ self.assertEqual(len(self.get_links('alice')), 2)
+
+ def test_add_wrong_size_keys(self):
+ """You should not be able to add the same link twice."""
+
+ self.addCleanup(self.runcmd, "user", "key-trust", "delete",
+ "-H", HOST, CREDS,
+ 'joe', '--all')
+
+ for fn in WRONG_SIZE_CERTS:
+ result, out, err = self.runcmd("user", "key-trust", "add",
+ "-H", HOST, CREDS,
+ 'joe', fn)
+ self.assertCmdFail(result)
+ self.assertIn('ERROR: 2048 bit RSA key expected, not', err)
+
+ self.assertEqual(self.get_links('joe'), [])
+
+ for fn in WRONG_SIZE_CERTS:
+ # it will work with --force
+ result, out, err = self.runcmd("user", "key-trust", "add",
+ "-H", HOST, CREDS,
+ '--force',
+ 'joe', fn)
+
+ self.assertCmdSuccess(result, out, err)
+
+ self.assertEqual(len(self.get_links('joe')), 2)
+
+ def test_add_non_rsa_keys(self):
+ """You should not be able to add the same link twice."""
+
+ self.addCleanup(self.runcmd, "user", "key-trust", "delete",
+ "-H", HOST, CREDS,
+ 'joe', '--all')
+
+ for fn in NON_RSA_CERTS:
+ result, out, err = self.runcmd("user", "key-trust", "add",
+ "-H", HOST, CREDS,
+ 'joe', fn)
+ self.assertCmdFail(result)
+ self.assertIn('only RSA Public Keys are supported', err)
+
+ self.assertEqual(self.get_links('joe'), [])
+
+ for fn in NON_RSA_CERTS:
+ # it will NOT work with --force
+ result, out, err = self.runcmd("user", "key-trust", "add",
+ "-H", HOST, CREDS,
+ '--force',
+ 'joe', fn)
+
+ self.assertCmdFail(result)
+ self.assertIn('only RSA Public Keys are supported', err)
+
+ self.assertEqual(self.get_links('joe'), [])
+
+ def test_add_good_cert_bad_dn(self):
+ """Fails differently with --force"""
+ links = self.get_links('joe')
+ n = len(links)
+ target = f"CN=an RDN that is not there,{self.samdb.domain_dn()}"
+ result, out, err = self.runcmd("user", "key-trust", "add",
+ "-H", HOST, CREDS,
+ '--link-target', target,
+ 'joe', GOOD_CERTS[0])
+ self.assertCmdFail(result)
+ self.assertIn(f"ERROR: Link target '{target}' does not exist", err)
+ self.assertEqual(len(links), 0)
+
+ result, out, err = self.runcmd("user", "key-trust", "add",
+ "-H", HOST, CREDS,
+ '--link-target', target,
+ '--force',
+ 'joe', GOOD_CERTS[1])
+ self.assertCmdFail(result)
+ self.assertIn("ERROR(ldb): uncaught exception", err)
+ self.assertIn("LDAP_CONSTRAINT_VIOLATION", err)
+ self.assertEqual(len(links), 0)
+
+ def test_add_good_cert_bad_encoding(self):
+ """If we use --encoding=pem with a DER file or vice versa, it
+ should fail."""
+ self.addCleanup(self.runcmd, "user", "key-trust", "delete",
+ "-H", HOST, CREDS,
+ 'joe', '--all')
+
+ result, out, err = self.runcmd("user", "key-trust", "add",
+ "-H", HOST, CREDS,
+ '--encoding', 'der',
+ 'joe', GOOD_CERTS[0])
+ self.assertCmdFail(result)
+ self.assertIn("ERROR: could not decode public key", err)
+ self.assertEqual(self.get_links('joe'), [])
+
+ # try to --force this one, to no avail
+ result, out, err = self.runcmd("user", "key-trust", "add",
+ "-H", HOST, CREDS,
+ '--force',
+ '--encoding', 'pem',
+ 'joe', GOOD_KEYS[0])
+ self.assertCmdFail(result)
+ self.assertIn("ERROR: could not decode public key", err)
+ self.assertEqual(self.get_links('joe'), [])
+
+ with self.assertRaises(SystemExit):
+ # we can't catch result and output here because it fails
+ # in optparse which prints straight to stderr.
+ self.runcmd("user", "key-trust", "add",
+ "-H", HOST, CREDS,
+ '--encoding', 'pineapple',
+ 'joe', GOOD_CERTS[1])
+ self.assertCmdFail(result)
+ self.assertEqual(self.get_links('joe'), [])
+
+ # right encoding
+ result, out, err = self.runcmd("user", "key-trust", "add",
+ "-H", HOST, CREDS,
+ '--encoding', 'pem',
+ 'joe', GOOD_CERTS[1])
+ self.assertCmdSuccess(result, out, err)
+ self.assertEqual(len(self.get_links('joe')), 1)
+
+ # 'auto' encoding
+ result, out, err = self.runcmd("user", "key-trust", "add",
+ "-H", HOST, CREDS,
+ '--encoding', 'auto',
+ 'joe', GOOD_CERTS[0])
+ self.assertCmdSuccess(result, out, err)
+ self.assertEqual(len(self.get_links('joe')), 2)
planpythontestsuite("ad_dc_ntvfs:local", "samba.tests.samba_tool.user")
planpythontestsuite("ad_dc_default", "samba.tests.samba_tool.user_auth_policy")
planpythontestsuite("ad_dc_default", "samba.tests.samba_tool.user_auth_silo")
+planpythontestsuite("ad_dc_default", "samba.tests.samba_tool.user_keytrust")
for env in ["ad_dc_default:local", "ad_dc_no_ntlm:local"]:
planpythontestsuite(env, "samba.tests.samba_tool.user_wdigest")
for env, nt_hash in [("ad_dc:local", True),
--- /dev/null
+-----BEGIN CERTIFICATE-----
+MIIBuTCCAWCgAwIBAgIBATAKBggqhkjOPQQDAjA2MQswCQYDVQQGEwJTRTEQMA4G
+A1UECgwHSGVpbWRhbDEVMBMGA1UEAwwMQ0Egc2VjcDI1NnIxMCAXDTE5MDMyMjIy
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--- /dev/null
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--- /dev/null
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--- /dev/null
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--- /dev/null
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--- /dev/null
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--- /dev/null
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--- /dev/null
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