493 lines
19 KiB
Python
493 lines
19 KiB
Python
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"""A re-implementation of the MS DirectoryService samples related to services.
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* Adds and removes an ActiveDirectory "Service Connection Point",
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including managing the security on the object.
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* Creates and registers Service Principal Names.
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* Changes the username for a domain user.
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Some of these functions are likely to become move to a module - but there
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is also a little command-line-interface to try these functions out.
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For example:
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scp.py --account-name=domain\\user --service-class=PythonScpTest \\
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--keyword=foo --keyword=bar --binding-string=bind_info \\
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ScpCreate SpnCreate SpnRegister
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would:
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* Attempt to delete a Service Connection Point for the service class
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'PythonScpTest'
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* Attempt to create a Service Connection Point for that class, with 2
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keywords and a binding string of 'bind_info'
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* Create a Service Principal Name for the service and register it
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to undo those changes, you could execute:
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scp.py --account-name=domain\\user --service-class=PythonScpTest \\
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SpnCreate SpnUnregister ScpDelete
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which will:
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* Create a SPN
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* Unregister that SPN from the Active Directory.
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* Delete the Service Connection Point
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Executing with --test will create and remove one of everything.
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"""
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from win32com.adsi.adsicon import *
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from win32com.adsi import adsi
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import win32api, win32con, winerror
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from win32com.client import Dispatch
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import ntsecuritycon as dscon
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import win32security
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import optparse, textwrap
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import traceback
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verbose = 1
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g_createdSCP = None
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g_createdSPNs = []
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g_createdSPNLast = None
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import logging
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logger = logging # use logging module global methods for now.
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# still a bit confused about log(n, ...) vs logger.info/debug()
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# Returns distinguished name of SCP.
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def ScpCreate(
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service_binding_info,
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service_class_name, # Service class string to store in SCP.
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account_name = None, # Logon account that needs access to SCP.
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container_name = None,
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keywords = None,
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object_class = "serviceConnectionPoint",
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dns_name_type = "A",
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dn = None,
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dns_name = None,
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):
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container_name = container_name or service_class_name
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if not dns_name:
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# Get the DNS name of the local computer
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dns_name = win32api.GetComputerNameEx(win32con.ComputerNameDnsFullyQualified)
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# Get the distinguished name of the computer object for the local computer
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if dn is None:
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dn = win32api.GetComputerObjectName(win32con.NameFullyQualifiedDN)
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# Compose the ADSpath and bind to the computer object for the local computer
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comp = adsi.ADsGetObject("LDAP://" + dn, adsi.IID_IDirectoryObject)
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# Publish the SCP as a child of the computer object
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keywords = keywords or []
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# Fill in the attribute values to be stored in the SCP.
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attrs = [
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("cn", ADS_ATTR_UPDATE, ADSTYPE_CASE_IGNORE_STRING, (container_name,)),
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("objectClass", ADS_ATTR_UPDATE, ADSTYPE_CASE_IGNORE_STRING, (object_class,)),
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("keywords", ADS_ATTR_UPDATE, ADSTYPE_CASE_IGNORE_STRING, keywords),
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("serviceDnsName", ADS_ATTR_UPDATE, ADSTYPE_CASE_IGNORE_STRING, (dns_name,)),
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("serviceDnsNameType", ADS_ATTR_UPDATE, ADSTYPE_CASE_IGNORE_STRING, (dns_name_type,)),
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("serviceClassName", ADS_ATTR_UPDATE, ADSTYPE_CASE_IGNORE_STRING, (service_class_name,)),
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("serviceBindingInformation", ADS_ATTR_UPDATE, ADSTYPE_CASE_IGNORE_STRING, (service_binding_info,)),
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]
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new = comp.CreateDSObject("cn=" + container_name, attrs)
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logger.info("New connection point is at %s", container_name)
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# Wrap in a usable IDispatch object.
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new = Dispatch(new)
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# And allow access to the SCP for the specified account name
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AllowAccessToScpProperties(account_name, new)
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return new
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def ScpDelete(container_name, dn = None):
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if dn is None:
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dn = win32api.GetComputerObjectName(win32con.NameFullyQualifiedDN)
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logger.debug("Removing connection point '%s' from %s", container_name, dn)
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# Compose the ADSpath and bind to the computer object for the local computer
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comp = adsi.ADsGetObject("LDAP://" + dn, adsi.IID_IDirectoryObject)
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comp.DeleteDSObject("cn=" + container_name)
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logger.info("Deleted service connection point '%s'", container_name)
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# This function is described in detail in the MSDN article titled
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# "Enabling Service Account to Access SCP Properties"
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# From that article:
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# The following sample code sets a pair of ACEs on a service connection point
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# (SCP) object. The ACEs grant read/write access to the user or computer account
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# under which the service instance will be running. Your service installation
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# program calls this code to ensure that the service will be allowed to update
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# its properties at run time. If you don't set ACEs like these, your service
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# will get access-denied errors if it tries to modify the SCP's properties.
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#
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# The code uses the IADsSecurityDescriptor, IADsAccessControlList, and
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# IADsAccessControlEntry interfaces to do the following:
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# * Get the SCP object's security descriptor.
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# * Set ACEs in the DACL of the security descriptor.
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# * Set the security descriptor back on the SCP object.
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def AllowAccessToScpProperties(
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accountSAM, #Service account to allow access.
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scpObject, # The IADs SCP object.
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schemaIDGUIDs = # Attributes to allow write-access to.
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("{28630eb8-41d5-11d1-a9c1-0000f80367c1}", # serviceDNSName
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"{b7b1311c-b82e-11d0-afee-0000f80367c1}", # serviceBindingInformation
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)
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):
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# If no service account is specified, service runs under LocalSystem.
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# So allow access to the computer account of the service's host.
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if accountSAM:
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trustee = accountSAM
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else:
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# Get the SAM account name of the computer object for the server.
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trustee = win32api.GetComputerObjectName(win32con.NameSamCompatible)
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# Get the nTSecurityDescriptor attribute
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attribute = "nTSecurityDescriptor"
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sd = getattr(scpObject, attribute)
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acl = sd.DiscretionaryAcl
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for sguid in schemaIDGUIDs:
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ace = Dispatch(adsi.CLSID_AccessControlEntry)
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# Set the properties of the ACE.
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# Allow read and write access to the property.
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ace.AccessMask = ADS_RIGHT_DS_READ_PROP | ADS_RIGHT_DS_WRITE_PROP
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# Set the trustee, which is either the service account or the
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# host computer account.
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ace.Trustee = trustee
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# Set the ACE type.
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ace.AceType = ADS_ACETYPE_ACCESS_ALLOWED_OBJECT
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# Set AceFlags to zero because ACE is not inheritable.
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ace.AceFlags = 0
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# Set Flags to indicate an ACE that protects a specified object.
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ace.Flags = ADS_FLAG_OBJECT_TYPE_PRESENT
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# Set ObjectType to the schemaIDGUID of the attribute.
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ace.ObjectType = sguid
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# Add the ACEs to the DACL.
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acl.AddAce(ace)
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# Write the modified DACL back to the security descriptor.
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sd.DiscretionaryAcl = acl
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# Write the ntSecurityDescriptor property to the property cache.
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setattr(scpObject, attribute, sd)
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# SetInfo updates the SCP object in the directory.
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scpObject.SetInfo()
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logger.info("Set security on object for account '%s'" % (trustee,))
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# Service Principal Names functions from the same sample.
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# The example calls the DsWriteAccountSpn function, which stores the SPNs in
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# Microsoft Active Directory under the servicePrincipalName attribute of the
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# account object specified by the serviceAcctDN parameter. The account object
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# corresponds to the logon account specified in the CreateService call for this
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# service instance. If the logon account is a domain user account,
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# serviceAcctDN must be the distinguished name of the account object in
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# Active Directory for that user account. If the service's logon account is the
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# LocalSystem account, serviceAcctDN must be the distinguished name of the
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# computer account object for the host computer on which the service is
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# installed. win32api.TranslateNames and win32security.DsCrackNames can
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# be used to convert a domain\account format name to a distinguished name.
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def SpnRegister(
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serviceAcctDN, # DN of the service's logon account
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spns, # List of SPNs to register
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operation, # Add, replace, or delete SPNs
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):
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assert type(spns) not in [str, str] and hasattr(spns, "__iter__"), \
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"spns must be a sequence of strings (got %r)" % spns
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# Bind to a domain controller.
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# Get the domain for the current user.
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samName = win32api.GetUserNameEx(win32api.NameSamCompatible)
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samName = samName.split('\\', 1)[0]
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if not serviceAcctDN:
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# Get the SAM account name of the computer object for the server.
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serviceAcctDN = win32api.GetComputerObjectName(win32con.NameFullyQualifiedDN)
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logger.debug("SpnRegister using DN '%s'", serviceAcctDN)
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# Get the name of a domain controller in that domain.
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info = win32security.DsGetDcName(
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domainName=samName,
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flags=dscon.DS_IS_FLAT_NAME |
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dscon.DS_RETURN_DNS_NAME |
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dscon.DS_DIRECTORY_SERVICE_REQUIRED)
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# Bind to the domain controller.
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handle = win32security.DsBind( info['DomainControllerName'] )
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# Write the SPNs to the service account or computer account.
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logger.debug("DsWriteAccountSpn with spns %s")
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win32security.DsWriteAccountSpn(
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handle, # handle to the directory
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operation, # Add or remove SPN from account's existing SPNs
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serviceAcctDN, # DN of service account or computer account
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spns) # names
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# Unbind the DS in any case (but Python would do it anyway)
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handle.Close()
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def UserChangePassword(username_dn, new_password):
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# set the password on the account.
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# Use the distinguished name to bind to the account object.
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accountPath = "LDAP://" + username_dn
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user = adsi.ADsGetObject(accountPath, adsi.IID_IADsUser)
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# Set the password on the account.
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user.SetPassword(new_password)
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# functions related to the command-line interface
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def log(level, msg, *args):
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if verbose >= level:
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print(msg % args)
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class _NoDefault: pass
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def _get_option(po, opt_name, default = _NoDefault):
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parser, options = po
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ret = getattr(options, opt_name, default)
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if not ret and default is _NoDefault:
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parser.error("The '%s' option must be specified for this operation" % opt_name)
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if not ret:
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ret = default
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return ret
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def _option_error(po, why):
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parser = po[0]
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parser.error(why)
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def do_ScpCreate(po):
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"""Create a Service Connection Point"""
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global g_createdSCP
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scp = ScpCreate(_get_option(po, "binding_string"),
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_get_option(po, "service_class"),
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_get_option(po, "account_name_sam", None),
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keywords=_get_option(po, "keywords", None))
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g_createdSCP = scp
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return scp.distinguishedName
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def do_ScpDelete(po):
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"""Delete a Service Connection Point"""
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sc = _get_option(po, "service_class")
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try:
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ScpDelete(sc)
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except adsi.error as details:
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if details[0] != winerror.ERROR_DS_OBJ_NOT_FOUND:
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raise
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log(2, "ScpDelete ignoring ERROR_DS_OBJ_NOT_FOUND for service-class '%s'",
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sc)
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return sc
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def do_SpnCreate(po):
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"""Create a Service Principal Name"""
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# The 'service name' is the dn of our scp.
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if g_createdSCP is None:
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# Could accept an arg to avoid this?
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_option_error(po, "ScpCreate must have been specified before SpnCreate")
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# Create a Service Principal Name"
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spns = win32security.DsGetSpn(dscon.DS_SPN_SERVICE,
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_get_option(po, "service_class"),
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g_createdSCP.distinguishedName,
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_get_option(po, "port", 0),
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None, None)
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spn = spns[0]
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log(2, "Created SPN: %s", spn)
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global g_createdSPNLast
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g_createdSPNLast = spn
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g_createdSPNs.append(spn)
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return spn
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def do_SpnRegister(po):
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"""Register a previously created Service Principal Name"""
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if not g_createdSPNLast:
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_option_error(po, "SpnCreate must appear before SpnRegister")
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SpnRegister(_get_option(po, "account_name_dn", None),
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(g_createdSPNLast,),
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dscon.DS_SPN_ADD_SPN_OP)
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return g_createdSPNLast
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def do_SpnUnregister(po):
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"""Unregister a previously created Service Principal Name"""
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if not g_createdSPNLast:
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_option_error(po, "SpnCreate must appear before SpnUnregister")
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SpnRegister(_get_option(po, "account_name_dn", None),
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(g_createdSPNLast,),
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dscon.DS_SPN_DELETE_SPN_OP)
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return g_createdSPNLast
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def do_UserChangePassword(po):
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"""Change the password for a specified user"""
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UserChangePassword(_get_option(po, "account_name_dn"),
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_get_option(po, "password"))
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return "Password changed OK"
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handlers = (
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('ScpCreate', do_ScpCreate),
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('ScpDelete', do_ScpDelete),
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('SpnCreate', do_SpnCreate),
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('SpnRegister', do_SpnRegister),
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('SpnUnregister', do_SpnUnregister),
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('UserChangePassword', do_UserChangePassword),
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)
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class HelpFormatter(optparse.IndentedHelpFormatter):
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def format_description(self, description):
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return description
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def main():
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global verbose
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_handlers_dict = {}
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arg_descs = []
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for arg, func in handlers:
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this_desc = "\n".join(textwrap.wrap(func.__doc__,
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subsequent_indent = " " * 8))
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arg_descs.append(" %s: %s" % (arg, this_desc))
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_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")
|