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# samba-tool commands to manager Key Credential Links on a computer
#
# 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 Computer
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_computer_keycredentiallink_add(Command):
"""Add a key-credential-link."""
synopsis = "%prog <computername> [options] <pubkey>"
takes_args = ["computername", "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 computer'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, computername, pubkey,
hostopts=None, sambaopts=None, credopts=None,
link_target=None, encoding='auto', force=False):
samdb = self.ldb_connect(hostopts, sambaopts, credopts)
computer = Computer.find(samdb, computername)
if link_target is None:
link_target = computer.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 computer.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, computer.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, computer.save() below will raise an
# ERR_ATTRIBUTE_OR_VALUE_EXISTS LdbError.
raise CommandError(f"Computer {computername} "
"already has this key credential link")
computer.key_credential_link.append(link)
computer.save(samdb)
class cmd_computer_keycredentiallink_delete(Command):
"""Delete a key-credential-link."""
synopsis = "%prog <computername> [options]"
takes_args = ["computername"]
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, computername, hostopts=None, sambaopts=None, credopts=None,
link_target=None, fingerprint=None, all=False, dry_run=False):
samdb = self.ldb_connect(hostopts, sambaopts, credopts)
computer = Computer.find(samdb, computername)
keycredlinks = computer.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"{computername} 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")
computer.key_credential_link = keepers
computer.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"{computername} now has {nk} key credential link"
f"{'' if nk == 1 else 's'}")
class cmd_computer_keycredentiallink_view(Command):
"""View a computer's key credential links."""
synopsis = "%prog <computername> [options]"
takes_args = ["computername"]
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, computername, hostopts=None, sambaopts=None, credopts=None,
verbose=False):
samdb = self.ldb_connect(hostopts, sambaopts, credopts)
computer = Computer.find(samdb, computername)
if verbose:
verbosity = 3
else:
verbosity = 2
n = len(computer.key_credential_link)
self.message(f"{computername} has {n} key credential link"
f"{'' if n == 1 else 's'}\n")
for kcl in computer.key_credential_link:
self.message(kcl.description(verbosity), '')
class cmd_computer_keytrust(SuperCommand):
"""Manage key-credential links on a computer."""
subcommands = {
"add": cmd_computer_keycredentiallink_add(),
"delete": cmd_computer_keycredentiallink_delete(),
"view": cmd_computer_keycredentiallink_view(),
}
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