feat(HTCondorCE): add option to submit with SSL

set UseSSLSubmission = True to a computing element and provide the local userkey and usercert files in coordination with participating Sites
as they have to configure DN of the submitting user

src/DIRAC/Resources/Computing/HTCondorCEComputingElement.py

@@ -27,6 +27,10 @@
    then one does not need to run condor daemons on the submit machine.
    If True requires the condor grid middleware (condor_submit, condor_history, condor_q, condor_rm)
 
+UseSSLSubmission:
+   If 'True', use SSL via a DN configured at the given computing element to submit jobs.
+   This is a bridge feature until everyone is capable to use Tokens to submit to computing elements.
+
 WorkingDirectory:
    Location to store the pilot and condor log files locally. It should exist on the server and be accessible (both
    readable and writeable).  Also temporary files like condor submit files are kept here. This option is only read
@@ -62,7 +66,7 @@
 from DIRAC.WorkloadManagementSystem.Client import PilotStatus
 from DIRAC.WorkloadManagementSystem.Client.PilotManagerClient import PilotManagerClient
 from DIRAC.FrameworkSystem.private.authorization.utils.Tokens import writeToTokenFile
-from DIRAC.Core.Security.Locations import getCAsLocation
+from DIRAC.Core.Security.Locations import getCAsLocation, getCertificateAndKeyLocation
 from DIRAC.Resources.Computing.BatchSystems.Condor import HOLD_REASON_SUBCODE, subTemplate, parseCondorStatus
 
 MANDATORY_PARAMETERS = ["Queue"]
@@ -104,6 +108,7 @@ def __init__(self, ceUniqueID):
             gConfig.getValue("Resources/Computing/HTCondorCE/WorkingDirectory", DEFAULT_WORKINGDIRECTORY),
         )
         self.useLocalSchedd = True
+        self.useSSLSubmission = False
         self.remoteScheddOptions = ""
         self.tokenFile = None
 
@@ -217,6 +222,11 @@ def _reset(self):
             "" if self.useLocalSchedd else f"-pool {self.ceName}:{self.port} -name {self.ceName} "
         )
 
+        self.useSSLSubmission = self.ceParameters.get("UseSSLSubmission", self.useSSLSubmission)
+        if isinstance(self.useSSLSubmission, str):
+            if self.useSSLSubmission == "True":
+                self.useSSLSubmission = True
+
         self.log.debug("Using local schedd:", self.useLocalSchedd)
         self.log.debug("Remote scheduler option:", self.remoteScheddOptions)
         return S_OK()
@@ -239,6 +249,23 @@ def _executeCondorCommand(self, cmd, keepTokenFile=False):
         htcEnv = {
             "_CONDOR_SEC_CLIENT_AUTHENTICATION_METHODS": "GSI",
         }
+
+        if self.useSSLSubmission:
+            if not certAndKey := getCertificateAndKeyLocation():
+                return S_ERROR("You want to use SSL Submission, but no certificate and key are present")
+            if not caFiles := getCASLocation():
+                return S_ERROR("You want to use SSL Submission, but no CA files are present")
+            htcEnv = {
+                "_condor_SEC_CLIENT_AUTHENTICATION_METHODS": "SSL",
+                "_condor_AUTH_SSL_CLIENT_CERTFILE": certAndKey[0],
+                "_condor_AUTH_SSL_CLIENT_KEYFILE": certAndKey[1],
+                "_condor_AUTH_SSL_CLIENT_CADIR": caFiles,
+                "_condor_AUTH_SSL_SERVER_CADIR": caFiles,
+                "_condor_AUTH_SSL_USE_CLIENT_PROXY_ENV_VAR": "false",
+                "_condor_AUTH_SSL_SERVER_CAFILE": "",
+                "_condor_AUTH_SSL_CLIENT_CAFILE": "",
+            }
+
         # If a token is present, then we use it (overriding htcEnv)
         if self.token:
             # Create a new token file if we do not keep it across several calls