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"""A re-implementation of the MS DirectoryService samples related to services.

* Adds and removes an ActiveDirectory "Service Connection Point",
  including managing the security on the object.
* Creates and registers Service Principal Names.
* Changes the username for a domain user.

Some of these functions are likely to become move to a module - but there
is also a little command-line-interface to try these functions out.

For example:

scp.py --account-name=domain\\user --service-class=PythonScpTest \\
       --keyword=foo --keyword=bar --binding-string=bind_info \\
       ScpCreate SpnCreate SpnRegister

would:
* Attempt to delete a Service Connection Point for the service class
  'PythonScpTest'
* Attempt to create a Service Connection Point for that class, with 2
  keywords and a binding string of 'bind_info'
* Create a Service Principal Name for the service and register it

to undo those changes, you could execute:

scp.py --account-name=domain\\user --service-class=PythonScpTest \\
       SpnCreate SpnUnregister ScpDelete

which will:
* Create a SPN
* Unregister that SPN from the Active Directory.
* Delete the Service Connection Point

Executing with --test will create and remove one of everything.
"""

from win32com.adsi.adsicon import *
from win32com.adsi import adsi
import win32api, win32con, winerror
from win32com.client import Dispatch
import ntsecuritycon as dscon
import win32security
import optparse, textwrap
import traceback

verbose = 1
g_createdSCP = None
g_createdSPNs = []
g_createdSPNLast = None

import logging

logger = logging  # use logging module global methods for now.

# still a bit confused about log(n, ...) vs logger.info/debug()

# Returns distinguished name of SCP.
def ScpCreate(
    service_binding_info,
    service_class_name,  # Service class string to store in SCP.
    account_name=None,  # Logon account that needs access to SCP.
    container_name=None,
    keywords=None,
    object_class="serviceConnectionPoint",
    dns_name_type="A",
    dn=None,
    dns_name=None,
):
    container_name = container_name or service_class_name
    if not dns_name:
        # Get the DNS name of the local computer
        dns_name = win32api.GetComputerNameEx(win32con.ComputerNameDnsFullyQualified)
    # Get the distinguished name of the computer object for the local computer
    if dn is None:
        dn = win32api.GetComputerObjectName(win32con.NameFullyQualifiedDN)

    # Compose the ADSpath and bind to the computer object for the local computer
    comp = adsi.ADsGetObject("LDAP://" + dn, adsi.IID_IDirectoryObject)

    # Publish the SCP as a child of the computer object
    keywords = keywords or []
    # Fill in the attribute values to be stored in the SCP.
    attrs = [
        ("cn", ADS_ATTR_UPDATE, ADSTYPE_CASE_IGNORE_STRING, (container_name,)),
        ("objectClass", ADS_ATTR_UPDATE, ADSTYPE_CASE_IGNORE_STRING, (object_class,)),
        ("keywords", ADS_ATTR_UPDATE, ADSTYPE_CASE_IGNORE_STRING, keywords),
        ("serviceDnsName", ADS_ATTR_UPDATE, ADSTYPE_CASE_IGNORE_STRING, (dns_name,)),
        (
            "serviceDnsNameType",
            ADS_ATTR_UPDATE,
            ADSTYPE_CASE_IGNORE_STRING,
            (dns_name_type,),
        ),
        (
            "serviceClassName",
            ADS_ATTR_UPDATE,
            ADSTYPE_CASE_IGNORE_STRING,
            (service_class_name,),
        ),
        (
            "serviceBindingInformation",
            ADS_ATTR_UPDATE,
            ADSTYPE_CASE_IGNORE_STRING,
            (service_binding_info,),
        ),
    ]
    new = comp.CreateDSObject("cn=" + container_name, attrs)
    logger.info("New connection point is at %s", container_name)
    # Wrap in a usable IDispatch object.
    new = Dispatch(new)
    # And allow access to the SCP for the specified account name
    AllowAccessToScpProperties(account_name, new)
    return new


def ScpDelete(container_name, dn=None):
    if dn is None:
        dn = win32api.GetComputerObjectName(win32con.NameFullyQualifiedDN)
    logger.debug("Removing connection point '%s' from %s", container_name, dn)

    # Compose the ADSpath and bind to the computer object for the local computer
    comp = adsi.ADsGetObject("LDAP://" + dn, adsi.IID_IDirectoryObject)
    comp.DeleteDSObject("cn=" + container_name)
    logger.info("Deleted service connection point '%s'", container_name)


# This function is described in detail in the MSDN article titled
# "Enabling Service Account to Access SCP Properties"
# From that article:
# The following sample code sets a pair of ACEs on a service connection point
# (SCP) object. The ACEs grant read/write access to the user or computer account
# under which the service instance will be running. Your service installation
# program calls this code to ensure that the service will be allowed to update
# its properties at run time. If you don't set ACEs like these, your service
# will get access-denied errors if it tries to modify the SCP's properties.
#
# The code uses the IADsSecurityDescriptor, IADsAccessControlList, and
# IADsAccessControlEntry interfaces to do the following:
# * Get the SCP object's security descriptor.
# * Set ACEs in the DACL of the security descriptor.
# * Set the security descriptor back on the SCP object.


def AllowAccessToScpProperties(
    accountSAM,  # Service account to allow access.
    scpObject,  # The IADs SCP object.
    schemaIDGUIDs=(  # Attributes to allow write-access to.
        "{28630eb8-41d5-11d1-a9c1-0000f80367c1}",  # serviceDNSName
        "{b7b1311c-b82e-11d0-afee-0000f80367c1}",  # serviceBindingInformation
    ),
):

    # If no service account is specified, service runs under LocalSystem.
    # So allow access to the computer account of the service's host.
    if accountSAM:
        trustee = accountSAM
    else:
        # Get the SAM account name of the computer object for the server.
        trustee = win32api.GetComputerObjectName(win32con.NameSamCompatible)

    # Get the nTSecurityDescriptor attribute
    attribute = "nTSecurityDescriptor"
    sd = getattr(scpObject, attribute)
    acl = sd.DiscretionaryAcl

    for sguid in schemaIDGUIDs:
        ace = Dispatch(adsi.CLSID_AccessControlEntry)

        # Set the properties of the ACE.
        # Allow read and write access to the property.
        ace.AccessMask = ADS_RIGHT_DS_READ_PROP | ADS_RIGHT_DS_WRITE_PROP

        # Set the trustee, which is either the service account or the
        # host computer account.
        ace.Trustee = trustee

        # Set the ACE type.
        ace.AceType = ADS_ACETYPE_ACCESS_ALLOWED_OBJECT

        # Set AceFlags to zero because ACE is not inheritable.
        ace.AceFlags = 0

        # Set Flags to indicate an ACE that protects a specified object.
        ace.Flags = ADS_FLAG_OBJECT_TYPE_PRESENT

        # Set ObjectType to the schemaIDGUID of the attribute.
        ace.ObjectType = sguid

        # Add the ACEs to the DACL.
        acl.AddAce(ace)

    # Write the modified DACL back to the security descriptor.
    sd.DiscretionaryAcl = acl
    # Write the ntSecurityDescriptor property to the property cache.
    setattr(scpObject, attribute, sd)
    # SetInfo updates the SCP object in the directory.
    scpObject.SetInfo()
    logger.info("Set security on object for account '%s'" % (trustee,))


# Service Principal Names functions from the same sample.
# The example calls the DsWriteAccountSpn function, which stores the SPNs in
# Microsoft Active Directory under the servicePrincipalName attribute of the
# account object specified by the serviceAcctDN parameter. The account object
# corresponds to the logon account specified in the CreateService call for this
# service instance. If the logon account is a domain user account,
# serviceAcctDN must be the distinguished name of the account object in
# Active Directory for that user account. If the service's logon account is the
# LocalSystem account, serviceAcctDN must be the distinguished name of the
# computer account object for the host computer on which the service is
# installed. win32api.TranslateNames and win32security.DsCrackNames can
# be used to convert a domain\account format name to a distinguished name.
def SpnRegister(
    serviceAcctDN,  # DN of the service's logon account
    spns,  # List of SPNs to register
    operation,  # Add, replace, or delete SPNs
):
    assert type(spns) not in [str, str] and hasattr(spns, "__iter__"), (
        "spns must be a sequence of strings (got %r)" % spns
    )
    # Bind to a domain controller.
    # Get the domain for the current user.
    samName = win32api.GetUserNameEx(win32api.NameSamCompatible)
    samName = samName.split("\\", 1)[0]

    if not serviceAcctDN:
        # Get the SAM account name of the computer object for the server.
        serviceAcctDN = win32api.GetComputerObjectName(win32con.NameFullyQualifiedDN)
    logger.debug("SpnRegister using DN '%s'", serviceAcctDN)

    # Get the name of a domain controller in that domain.
    info = win32security.DsGetDcName(
        domainName=samName,
        flags=dscon.DS_IS_FLAT_NAME
        | dscon.DS_RETURN_DNS_NAME
        | dscon.DS_DIRECTORY_SERVICE_REQUIRED,
    )
    # Bind to the domain controller.
    handle = win32security.DsBind(info["DomainControllerName"])

    # Write the SPNs to the service account or computer account.
    logger.debug("DsWriteAccountSpn with spns %s")
    win32security.DsWriteAccountSpn(
        handle,  # handle to the directory
        operation,  # Add or remove SPN from account's existing SPNs
        serviceAcctDN,  # DN of service account or computer account
        spns,
    )  # names

    # Unbind the DS in any case (but Python would do it anyway)
    handle.Close()


def UserChangePassword(username_dn, new_password):
    # set the password on the account.
    # Use the distinguished name to bind to the account object.
    accountPath = "LDAP://" + username_dn
    user = adsi.ADsGetObject(accountPath, adsi.IID_IADsUser)

    # Set the password on the account.
    user.SetPassword(new_password)


# functions related to the command-line interface
def log(level, msg, *args):
    if verbose >= level:
        print(msg % args)


class _NoDefault:
    pass


def _get_option(po, opt_name, default=_NoDefault):
    parser, options = po
    ret = getattr(options, opt_name, default)
    if not ret and default is _NoDefault:
        parser.error("The '%s' option must be specified for this operation" % opt_name)
    if not ret:
        ret = default
    return ret


def _option_error(po, why):
    parser = po[0]
    parser.error(why)


def do_ScpCreate(po):
    """Create a Service Connection Point"""
    global g_createdSCP
    scp = ScpCreate(
        _get_option(po, "binding_string"),
        _get_option(po, "service_class"),
        _get_option(po, "account_name_sam", None),
        keywords=_get_option(po, "keywords", None),
    )
    g_createdSCP = scp
    return scp.distinguishedName


def do_ScpDelete(po):
    """Delete a Service Connection Point"""
    sc = _get_option(po, "service_class")
    try:
        ScpDelete(sc)
    except adsi.error as details:
        if details[0] != winerror.ERROR_DS_OBJ_NOT_FOUND:
            raise
        log(2, "ScpDelete ignoring ERROR_DS_OBJ_NOT_FOUND for service-class '%s'", sc)
    return sc


def do_SpnCreate(po):
    """Create a Service Principal Name"""
    # The 'service name' is the dn of our scp.
    if g_createdSCP is None:
        # Could accept an arg to avoid this?
        _option_error(po, "ScpCreate must have been specified before SpnCreate")
    # Create a Service Principal Name"
    spns = win32security.DsGetSpn(
        dscon.DS_SPN_SERVICE,
        _get_option(po, "service_class"),
        g_createdSCP.distinguishedName,
        _get_option(po, "port", 0),
        None,
        None,
    )
    spn = spns[0]
    log(2, "Created SPN: %s", spn)
    global g_createdSPNLast
    g_createdSPNLast = spn
    g_createdSPNs.append(spn)
    return spn


def do_SpnRegister(po):
    """Register a previously created Service Principal Name"""
    if not g_createdSPNLast:
        _option_error(po, "SpnCreate must appear before SpnRegister")

    SpnRegister(
        _get_option(po, "account_name_dn", None),
        (g_createdSPNLast,),
        dscon.DS_SPN_ADD_SPN_OP,
    )
    return g_createdSPNLast


def do_SpnUnregister(po):
    """Unregister a previously created Service Principal Name"""
    if not g_createdSPNLast:
        _option_error(po, "SpnCreate must appear before SpnUnregister")
    SpnRegister(
        _get_option(po, "account_name_dn", None),
        (g_createdSPNLast,),
        dscon.DS_SPN_DELETE_SPN_OP,
    )
    return g_createdSPNLast


def do_UserChangePassword(po):
    """Change the password for a specified user"""
    UserChangePassword(_get_option(po, "account_name_dn"), _get_option(po, "password"))
    return "Password changed OK"


handlers = (
    ("ScpCreate", do_ScpCreate),
    ("ScpDelete", do_ScpDelete),
    ("SpnCreate", do_SpnCreate),
    ("SpnRegister", do_SpnRegister),
    ("SpnUnregister", do_SpnUnregister),
    ("UserChangePassword", do_UserChangePassword),
)


class HelpFormatter(optparse.IndentedHelpFormatter):
    def format_description(self, description):
        return description


def main():
    global verbose
    _handlers_dict = {}

    arg_descs = []
    for arg, func in handlers:
        this_desc = "\n".join(textwrap.wrap(func.__doc__, subsequent_indent=" " * 8))
        arg_descs.append("  %s: %s" % (arg, this_desc))
        _handlers_dict[arg.lower()] = func

    description = __doc__ + "\ncommands:\n" + "\n".join(arg_descs) + "\n"

    parser = optparse.OptionParser(
        usage="%prog [options] command ...",
        description=description,
        formatter=HelpFormatter(),
    )

    parser.add_option(
        "-v",
        action="count",
        dest="verbose",
        default=1,
        help="increase the verbosity of status messages",
    )

    parser.add_option(
        "-q", "--quiet", action="store_true", help="Don't print any status messages"
    )

    parser.add_option(
        "-t",
        "--test",
        action="store_true",
        help="Execute a mini-test suite, providing defaults for most options and args",
    ),

    parser.add_option(
        "",
        "--show-tracebacks",
        action="store_true",
        help="Show the tracebacks for any exceptions",
    )

    parser.add_option("", "--service-class", help="The service class name to use")

    parser.add_option(
        "", "--port", default=0, help="The port number to associate with the SPN"
    )

    parser.add_option(
        "", "--binding-string", help="The binding string to use for SCP creation"
    )

    parser.add_option(
        "", "--account-name", help="The account name to use (default is LocalSystem)"
    )

    parser.add_option("", "--password", help="The password to set.")

    parser.add_option(
        "",
        "--keyword",
        action="append",
        dest="keywords",
        help="""A keyword to add to the SCP.  May be specified
                              multiple times""",
    )

    parser.add_option(
        "",
        "--log-level",
        help="""The log-level to use - may be a number or a logging
                             module constant""",
        default=str(logging.WARNING),
    )

    options, args = parser.parse_args()
    po = (parser, options)
    # fixup misc
    try:
        options.port = int(options.port)
    except (TypeError, ValueError):
        parser.error("--port must be numeric")
    # fixup log-level
    try:
        log_level = int(options.log_level)
    except (TypeError, ValueError):
        try:
            log_level = int(getattr(logging, options.log_level.upper()))
        except (ValueError, TypeError, AttributeError):
            parser.error("Invalid --log-level value")
    try:
        sl = logger.setLevel
        # logger is a real logger
    except AttributeError:
        # logger is logging module
        sl = logging.getLogger().setLevel
    sl(log_level)
    # Check -q/-v
    if options.quiet and options.verbose:
        parser.error("Can't specify --quiet and --verbose")
    if options.quiet:
        options.verbose -= 1
    verbose = options.verbose
    # --test
    if options.test:
        if args:
            parser.error("Can't specify args with --test")

        args = "ScpDelete ScpCreate SpnCreate SpnRegister SpnUnregister ScpDelete"
        log(1, "--test - pretending args are:\n %s", args)
        args = args.split()
        if not options.service_class:
            options.service_class = "PythonScpTest"
            log(2, "--test: --service-class=%s", options.service_class)
        if not options.keywords:
            options.keywords = "Python Powered".split()
            log(2, "--test: --keyword=%s", options.keywords)
        if not options.binding_string:
            options.binding_string = "test binding string"
            log(2, "--test: --binding-string=%s", options.binding_string)

    # check args
    if not args:
        parser.error("No command specified (use --help for valid commands)")
    for arg in args:
        if arg.lower() not in _handlers_dict:
            parser.error("Invalid command '%s' (use --help for valid commands)" % arg)

    # Patch up account-name.
    if options.account_name:
        log(2, "Translating account name '%s'", options.account_name)
        options.account_name_sam = win32security.TranslateName(
            options.account_name, win32api.NameUnknown, win32api.NameSamCompatible
        )
        log(2, "NameSamCompatible is '%s'", options.account_name_sam)
        options.account_name_dn = win32security.TranslateName(
            options.account_name, win32api.NameUnknown, win32api.NameFullyQualifiedDN
        )
        log(2, "NameFullyQualifiedDNis '%s'", options.account_name_dn)

    # do it.
    for arg in args:
        handler = _handlers_dict[arg.lower()]  # already been validated
        if handler is None:
            parser.error("Invalid command '%s'" % arg)
        err_msg = None
        try:
            try:
                log(2, "Executing '%s'...", arg)
                result = handler(po)
                log(1, "%s: %s", arg, result)
            except:
                if options.show_tracebacks:
                    print("--show-tracebacks specified - dumping exception")
                    traceback.print_exc()
                raise
        except adsi.error as xxx_todo_changeme:
            (hr, desc, exc, argerr) = xxx_todo_changeme.args
            if exc:
                extra_desc = exc[2]
            else:
                extra_desc = ""
            err_msg = desc
            if extra_desc:
                err_msg += "\n\t" + extra_desc
        except win32api.error as xxx_todo_changeme1:
            (hr, func, msg) = xxx_todo_changeme1.args
            err_msg = msg
        if err_msg:
            log(1, "Command '%s' failed: %s", arg, err_msg)


if __name__ == "__main__":
    try:
        main()
    except KeyboardInterrupt:
        print("*** Interrupted")

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