Luke Granger-Brown
57725ef3ec
git-subtree-dir: third_party/nixpkgs git-subtree-split: 76612b17c0ce71689921ca12d9ffdc9c23ce40b2
708 lines
20 KiB
Python
708 lines
20 KiB
Python
import grp
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import json
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import pwd
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import os
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import re
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import string
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import subprocess
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import sys
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from contextlib import contextmanager
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from shutil import rmtree
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from tempfile import NamedTemporaryFile
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import click
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IS_AUTO_CONFIG = @isAutoConfig@ # NOQA
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CERTTOOL_COMMAND = "@certtool@"
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CERT_BITS = "@certBits@"
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CLIENT_EXPIRATION = "@clientExpiration@"
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CRL_EXPIRATION = "@crlExpiration@"
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TASKD_COMMAND = "@taskd@"
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TASKD_DATA_DIR = "@dataDir@"
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TASKD_USER = "@user@"
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TASKD_GROUP = "@group@"
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FQDN = "@fqdn@"
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CA_KEY = os.path.join(TASKD_DATA_DIR, "keys", "ca.key")
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CA_CERT = os.path.join(TASKD_DATA_DIR, "keys", "ca.cert")
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CRL_FILE = os.path.join(TASKD_DATA_DIR, "keys", "server.crl")
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RE_CONFIGUSER = re.compile(r'^\s*user\s*=(.*)$')
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RE_USERKEY = re.compile(r'New user key: (.+)$', re.MULTILINE)
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def lazyprop(fun):
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"""
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Decorator which only evaluates the specified function when accessed.
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"""
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name = '_lazy_' + fun.__name__
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@property
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def _lazy(self):
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val = getattr(self, name, None)
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if val is None:
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val = fun(self)
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setattr(self, name, val)
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return val
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return _lazy
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class TaskdError(OSError):
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pass
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def run_as_taskd_user():
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uid = pwd.getpwnam(TASKD_USER).pw_uid
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gid = grp.getgrnam(TASKD_GROUP).gr_gid
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os.setgid(gid)
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os.setuid(uid)
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def run_as_taskd_group():
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gid = grp.getgrnam(TASKD_GROUP).gr_gid
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os.setgid(gid)
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def taskd_cmd(cmd, *args, **kwargs):
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"""
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Invoke taskd with the specified command with the privileges of the 'taskd'
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user and 'taskd' group.
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If 'capture_stdout' is passed as a keyword argument with the value True,
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the return value are the contents the command printed to stdout.
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"""
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capture_stdout = kwargs.pop("capture_stdout", False)
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fun = subprocess.check_output if capture_stdout else subprocess.check_call
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return fun(
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[TASKD_COMMAND, cmd, "--data", TASKD_DATA_DIR] + list(args),
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preexec_fn=run_as_taskd_user,
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**kwargs
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)
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def certtool_cmd(*args, **kwargs):
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"""
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Invoke certtool from GNUTLS and return the output of the command.
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The provided arguments are added to the certtool command and keyword
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arguments are added to subprocess.check_output().
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Note that this will suppress all output of certtool and it will only be
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printed whenever there is an unsuccessful return code.
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"""
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return subprocess.check_output(
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[CERTTOOL_COMMAND] + list(args),
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preexec_fn=run_as_taskd_group,
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stderr=subprocess.STDOUT,
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**kwargs
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)
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def label(msg):
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if sys.stdout.isatty() or sys.stderr.isatty():
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sys.stderr.write(msg + "\n")
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def mkpath(*args):
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return os.path.join(TASKD_DATA_DIR, "orgs", *args)
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def mark_imperative(*path):
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"""
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Mark the specified path as being imperatively managed by creating an empty
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file called ".imperative", so that it doesn't interfere with the
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declarative configuration.
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"""
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open(os.path.join(mkpath(*path), ".imperative"), 'a').close()
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def is_imperative(*path):
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"""
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Check whether the given path is marked as imperative, see mark_imperative()
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for more information.
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"""
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full_path = []
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for component in path:
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full_path.append(component)
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if os.path.exists(os.path.join(mkpath(*full_path), ".imperative")):
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return True
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return False
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def fetch_username(org, key):
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for line in open(mkpath(org, "users", key, "config"), "r"):
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match = RE_CONFIGUSER.match(line)
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if match is None:
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continue
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return match.group(1).strip()
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return None
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@contextmanager
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def create_template(contents):
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"""
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Generate a temporary file with the specified contents as a list of strings
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and yield its path as the context.
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"""
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template = NamedTemporaryFile(mode="w", prefix="certtool-template")
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template.writelines(map(lambda l: l + "\n", contents))
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template.flush()
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yield template.name
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template.close()
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def generate_key(org, user):
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if not IS_AUTO_CONFIG:
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msg = "Automatic PKI handling is disabled, you need to " \
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"manually issue a client certificate for user {}.\n"
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sys.stderr.write(msg.format(user))
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return
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keysdir = os.path.join(TASKD_DATA_DIR, "keys" )
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orgdir = os.path.join(keysdir , org )
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userdir = os.path.join(orgdir , user )
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if os.path.exists(userdir):
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raise OSError("Keyfile directory for {} already exists.".format(user))
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privkey = os.path.join(userdir, "private.key")
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pubcert = os.path.join(userdir, "public.cert")
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try:
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# We change the permissions and the owner ship of the base directories
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# so that cfg.group and cfg.user could read the directories' contents.
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# See also: https://bugs.python.org/issue42367
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for bd in [keysdir, orgdir, userdir]:
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# Allow cfg.group, but not others to read the contents of this group
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os.makedirs(bd, exist_ok=True)
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# not using mode= argument to makedirs intentionally - forcing the
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# permissions we want
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os.chmod(bd, mode=0o750)
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os.chown(
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bd,
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uid=pwd.getpwnam(TASKD_USER).pw_uid,
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gid=grp.getgrnam(TASKD_GROUP).gr_gid,
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)
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certtool_cmd("-p", "--bits", CERT_BITS, "--outfile", privkey)
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os.chmod(privkey, 0o640)
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template_data = [
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"organization = {0}".format(org),
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"cn = {}".format(FQDN),
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"expiration_days = {}".format(CLIENT_EXPIRATION),
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"tls_www_client",
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"encryption_key",
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"signing_key"
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]
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with create_template(template_data) as template:
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certtool_cmd(
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"-c",
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"--load-privkey", privkey,
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"--load-ca-privkey", CA_KEY,
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"--load-ca-certificate", CA_CERT,
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"--template", template,
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"--outfile", pubcert
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)
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except:
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rmtree(userdir)
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raise
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def revoke_key(org, user):
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basedir = os.path.join(TASKD_DATA_DIR, "keys", org, user)
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if not os.path.exists(basedir):
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raise OSError("Keyfile directory for {} doesn't exist.".format(user))
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pubcert = os.path.join(basedir, "public.cert")
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expiration = "expiration_days = {}".format(CRL_EXPIRATION)
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with create_template([expiration]) as template:
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oldcrl = NamedTemporaryFile(mode="wb", prefix="old-crl")
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oldcrl.write(open(CRL_FILE, "rb").read())
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oldcrl.flush()
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certtool_cmd(
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"--generate-crl",
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"--load-crl", oldcrl.name,
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"--load-ca-privkey", CA_KEY,
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"--load-ca-certificate", CA_CERT,
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"--load-certificate", pubcert,
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"--template", template,
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"--outfile", CRL_FILE
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)
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oldcrl.close()
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rmtree(basedir)
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def is_key_line(line, match):
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return line.startswith("---") and line.lstrip("- ").startswith(match)
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def getkey(*args):
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path = os.path.join(TASKD_DATA_DIR, "keys", *args)
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buf = []
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for line in open(path, "r"):
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if len(buf) == 0:
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if is_key_line(line, "BEGIN"):
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buf.append(line)
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continue
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buf.append(line)
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if is_key_line(line, "END"):
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return ''.join(buf)
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raise IOError("Unable to get key from {}.".format(path))
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def mktaskkey(cfg, path, keydata):
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heredoc = 'cat > "{}" <<EOF\n{}EOF'.format(path, keydata)
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cmd = 'task config taskd.{} -- "{}"'.format(cfg, path)
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return heredoc + "\n" + cmd
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class User(object):
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def __init__(self, org, name, key):
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self.__org = org
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self.name = name
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self.key = key
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def export(self):
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credentials = '/'.join([self.__org, self.name, self.key])
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allow_unquoted = string.ascii_letters + string.digits + "/-_."
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if not all((c in allow_unquoted) for c in credentials):
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credentials = "'" + credentials.replace("'", r"'\''") + "'"
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script = []
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if IS_AUTO_CONFIG:
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pubcert = getkey(self.__org, self.name, "public.cert")
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privkey = getkey(self.__org, self.name, "private.key")
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cacert = getkey("ca.cert")
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keydir = "${TASKDATA:-$HOME/.task}/keys"
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script += [
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"umask 0077",
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'mkdir -p "{}"'.format(keydir),
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mktaskkey("certificate", os.path.join(keydir, "public.cert"),
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pubcert),
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mktaskkey("key", os.path.join(keydir, "private.key"), privkey),
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mktaskkey("ca", os.path.join(keydir, "ca.cert"), cacert)
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]
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script.append(
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"task config taskd.credentials -- {}".format(credentials)
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)
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return "\n".join(script) + "\n"
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class Group(object):
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def __init__(self, org, name):
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self.__org = org
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self.name = name
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class Organisation(object):
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def __init__(self, name, ignore_imperative):
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self.name = name
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self.ignore_imperative = ignore_imperative
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def add_user(self, name):
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"""
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Create a new user along with a certificate and key.
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Returns a 'User' object or None if the user already exists.
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"""
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if self.ignore_imperative and is_imperative(self.name):
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return None
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if name not in self.users.keys():
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output = taskd_cmd("add", "user", self.name, name,
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capture_stdout=True, encoding='utf-8')
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key = RE_USERKEY.search(output)
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if key is None:
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msg = "Unable to find key while creating user {}."
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raise TaskdError(msg.format(name))
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generate_key(self.name, name)
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newuser = User(self.name, name, key.group(1))
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self._lazy_users[name] = newuser
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return newuser
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return None
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def del_user(self, name):
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"""
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Delete a user and revoke its keys.
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"""
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if name in self.users.keys():
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user = self.get_user(name)
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if self.ignore_imperative and \
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is_imperative(self.name, "users", user.key):
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return
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# Work around https://bug.tasktools.org/browse/TD-40:
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rmtree(mkpath(self.name, "users", user.key))
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revoke_key(self.name, name)
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del self._lazy_users[name]
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def add_group(self, name):
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"""
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Create a new group.
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Returns a 'Group' object or None if the group already exists.
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"""
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if self.ignore_imperative and is_imperative(self.name):
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return None
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if name not in self.groups.keys():
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taskd_cmd("add", "group", self.name, name)
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newgroup = Group(self.name, name)
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self._lazy_groups[name] = newgroup
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return newgroup
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return None
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def del_group(self, name):
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"""
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Delete a group.
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"""
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if name in self.users.keys():
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if self.ignore_imperative and \
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is_imperative(self.name, "groups", name):
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return
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taskd_cmd("remove", "group", self.name, name)
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del self._lazy_groups[name]
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def get_user(self, name):
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return self.users.get(name)
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@lazyprop
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def users(self):
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result = {}
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for key in os.listdir(mkpath(self.name, "users")):
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user = fetch_username(self.name, key)
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if user is not None:
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result[user] = User(self.name, user, key)
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return result
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def get_group(self, name):
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return self.groups.get(name)
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@lazyprop
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def groups(self):
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result = {}
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for group in os.listdir(mkpath(self.name, "groups")):
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result[group] = Group(self.name, group)
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return result
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class Manager(object):
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def __init__(self, ignore_imperative=False):
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"""
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Instantiates an organisations manager.
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If ignore_imperative is True, all actions that modify data are checked
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whether they're created imperatively and if so, they will result in no
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operation.
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"""
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self.ignore_imperative = ignore_imperative
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def add_org(self, name):
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"""
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Create a new organisation.
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Returns an 'Organisation' object or None if the organisation already
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exists.
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"""
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if name not in self.orgs.keys():
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taskd_cmd("add", "org", name)
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neworg = Organisation(name, self.ignore_imperative)
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self._lazy_orgs[name] = neworg
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return neworg
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return None
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def del_org(self, name):
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"""
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Delete and revoke keys of an organisation with all its users and
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groups.
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"""
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org = self.get_org(name)
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if org is not None:
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if self.ignore_imperative and is_imperative(name):
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return
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for user in list(org.users.keys()):
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org.del_user(user)
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for group in list(org.groups.keys()):
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org.del_group(group)
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taskd_cmd("remove", "org", name)
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del self._lazy_orgs[name]
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def get_org(self, name):
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return self.orgs.get(name)
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@lazyprop
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def orgs(self):
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result = {}
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for org in os.listdir(mkpath()):
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result[org] = Organisation(org, self.ignore_imperative)
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return result
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class OrganisationType(click.ParamType):
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name = 'organisation'
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def convert(self, value, param, ctx):
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org = Manager().get_org(value)
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if org is None:
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self.fail("Organisation {} does not exist.".format(value))
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return org
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ORGANISATION = OrganisationType()
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@click.group()
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@click.pass_context
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def cli(ctx):
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"""
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Manage Taskserver users and certificates
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"""
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if not IS_AUTO_CONFIG:
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return
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for path in (CA_KEY, CA_CERT, CRL_FILE):
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if not os.path.exists(path):
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msg = "CA setup not done or incomplete, missing file {}."
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ctx.fail(msg.format(path))
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@cli.group("org")
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def org_cli():
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"""
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Manage organisations
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"""
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pass
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@cli.group("user")
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def user_cli():
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"""
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Manage users
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"""
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pass
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@cli.group("group")
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def group_cli():
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"""
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Manage groups
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"""
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pass
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@user_cli.command("list")
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@click.argument("organisation", type=ORGANISATION)
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def list_users(organisation):
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"""
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List all users belonging to the specified organisation.
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"""
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label("The following users exists for {}:".format(organisation.name))
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for user in organisation.users.values():
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sys.stdout.write(user.name + "\n")
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@group_cli.command("list")
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@click.argument("organisation", type=ORGANISATION)
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def list_groups(organisation):
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"""
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List all users belonging to the specified organisation.
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"""
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label("The following users exists for {}:".format(organisation.name))
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for group in organisation.groups.values():
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sys.stdout.write(group.name + "\n")
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@org_cli.command("list")
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def list_orgs():
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"""
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List available organisations
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"""
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label("The following organisations exist:")
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for org in Manager().orgs:
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sys.stdout.write(org.name + "\n")
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@user_cli.command("getkey")
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@click.argument("organisation", type=ORGANISATION)
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@click.argument("user")
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def get_uuid(organisation, user):
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"""
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Get the UUID of the specified user belonging to the specified organisation.
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"""
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userobj = organisation.get_user(user)
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if userobj is None:
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msg = "User {} doesn't exist in organisation {}."
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sys.exit(msg.format(userobj.name, organisation.name))
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label("User {} has the following UUID:".format(userobj.name))
|
|
sys.stdout.write(user.key + "\n")
|
|
|
|
|
|
@user_cli.command("export")
|
|
@click.argument("organisation", type=ORGANISATION)
|
|
@click.argument("user")
|
|
def export_user(organisation, user):
|
|
"""
|
|
Export user of the specified organisation as a series of shell commands
|
|
that can be used on the client side to easily import the certificates.
|
|
|
|
Note that the private key will be exported as well, so use this with care!
|
|
"""
|
|
userobj = organisation.get_user(user)
|
|
if userobj is None:
|
|
msg = "User {} doesn't exist in organisation {}."
|
|
sys.exit(msg.format(user, organisation.name))
|
|
|
|
sys.stdout.write(userobj.export())
|
|
|
|
|
|
@org_cli.command("add")
|
|
@click.argument("name")
|
|
def add_org(name):
|
|
"""
|
|
Create an organisation with the specified name.
|
|
"""
|
|
if os.path.exists(mkpath(name)):
|
|
msg = "Organisation with name {} already exists."
|
|
sys.exit(msg.format(name))
|
|
|
|
taskd_cmd("add", "org", name)
|
|
mark_imperative(name)
|
|
|
|
|
|
@org_cli.command("remove")
|
|
@click.argument("name")
|
|
def del_org(name):
|
|
"""
|
|
Delete the organisation with the specified name.
|
|
|
|
All of the users and groups will be deleted as well and client certificates
|
|
will be revoked.
|
|
"""
|
|
Manager().del_org(name)
|
|
msg = ("Organisation {} deleted. Be sure to restart the Taskserver"
|
|
" using 'systemctl restart taskserver.service' in order for"
|
|
" the certificate revocation to apply.")
|
|
click.echo(msg.format(name), err=True)
|
|
|
|
|
|
@user_cli.command("add")
|
|
@click.argument("organisation", type=ORGANISATION)
|
|
@click.argument("user")
|
|
def add_user(organisation, user):
|
|
"""
|
|
Create a user for the given organisation along with a client certificate
|
|
and print the key of the new user.
|
|
|
|
The client certificate along with it's public key can be shown via the
|
|
'user export' subcommand.
|
|
"""
|
|
userobj = organisation.add_user(user)
|
|
if userobj is None:
|
|
msg = "User {} already exists in organisation {}."
|
|
sys.exit(msg.format(user, organisation))
|
|
else:
|
|
mark_imperative(organisation.name, "users", userobj.key)
|
|
|
|
|
|
@user_cli.command("remove")
|
|
@click.argument("organisation", type=ORGANISATION)
|
|
@click.argument("user")
|
|
def del_user(organisation, user):
|
|
"""
|
|
Delete a user from the given organisation.
|
|
|
|
This will also revoke the client certificate of the given user.
|
|
"""
|
|
organisation.del_user(user)
|
|
msg = ("User {} deleted. Be sure to restart the Taskserver using"
|
|
" 'systemctl restart taskserver.service' in order for the"
|
|
" certificate revocation to apply.")
|
|
click.echo(msg.format(user), err=True)
|
|
|
|
|
|
@group_cli.command("add")
|
|
@click.argument("organisation", type=ORGANISATION)
|
|
@click.argument("group")
|
|
def add_group(organisation, group):
|
|
"""
|
|
Create a group for the given organisation.
|
|
"""
|
|
groupobj = organisation.add_group(group)
|
|
if groupobj is None:
|
|
msg = "Group {} already exists in organisation {}."
|
|
sys.exit(msg.format(group, organisation))
|
|
else:
|
|
mark_imperative(organisation.name, "groups", groupobj.name)
|
|
|
|
|
|
@group_cli.command("remove")
|
|
@click.argument("organisation", type=ORGANISATION)
|
|
@click.argument("group")
|
|
def del_group(organisation, group):
|
|
"""
|
|
Delete a group from the given organisation.
|
|
"""
|
|
organisation.del_group(group)
|
|
click("Group {} deleted.".format(group), err=True)
|
|
|
|
|
|
def add_or_delete(old, new, add_fun, del_fun):
|
|
"""
|
|
Given an 'old' and 'new' list, figure out the intersections and invoke
|
|
'add_fun' against every element that is not in the 'old' list and 'del_fun'
|
|
against every element that is not in the 'new' list.
|
|
|
|
Returns a tuple where the first element is the list of elements that were
|
|
added and the second element consisting of elements that were deleted.
|
|
"""
|
|
old_set = set(old)
|
|
new_set = set(new)
|
|
to_delete = old_set - new_set
|
|
to_add = new_set - old_set
|
|
for elem in to_delete:
|
|
del_fun(elem)
|
|
for elem in to_add:
|
|
add_fun(elem)
|
|
return to_add, to_delete
|
|
|
|
|
|
@cli.command("process-json")
|
|
@click.argument('json-file', type=click.File('rb'))
|
|
def process_json(json_file):
|
|
"""
|
|
Create and delete users, groups and organisations based on a JSON file.
|
|
|
|
The structure of this file is exactly the same as the
|
|
'services.taskserver.organisations' option of the NixOS module and is used
|
|
for declaratively adding and deleting users.
|
|
|
|
Hence this subcommand is not recommended outside of the scope of the NixOS
|
|
module.
|
|
"""
|
|
data = json.load(json_file)
|
|
|
|
mgr = Manager(ignore_imperative=True)
|
|
add_or_delete(mgr.orgs.keys(), data.keys(), mgr.add_org, mgr.del_org)
|
|
|
|
for org in mgr.orgs.values():
|
|
if is_imperative(org.name):
|
|
continue
|
|
add_or_delete(org.users.keys(), data[org.name]['users'],
|
|
org.add_user, org.del_user)
|
|
add_or_delete(org.groups.keys(), data[org.name]['groups'],
|
|
org.add_group, org.del_group)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
cli()
|