Hi Guilherme,
The client machine (xrootd 5.6.1) that I had the issue is a fully
credible OSG CE.
So, there should be no issue with the CA and X509_CERT_DIR.
I have used this python script to reproduce the issue on the client machine:
#############################################
import os
import sys
import errno
import subprocess
import zlib
import random
from XRootD import client
from XRootD.client.flags import OpenFlags
ENDPOINT='cmsio2.rc.ufl.edu:1094'
SAM_TEST_FILE='/store/mc/SAM/GenericTTbar/AODSIM/CMSSW_9_2_6_91X_mcRun1_realistic_v2-v1/00000/A64CCCF2-5C76-E711-B359-0CC47A78A3F8.root'
print ("XRootD Client Versin",client.__version__)
cmd = [ "xrdfs "+ENDPOINT+" query config version" ]
try:
result = subprocess.run(cmd, shell=True, capture_output=True, text=True)
print("XRootD Server Version", result.stdout)
except subprocess.TimeoutExpired:
print("connecting to endpoint timed out")
os.environ["X509_CERT_DIR"] =
"/cvmfs/cms.cern.ch/grid/etc/grid-security/certificates"
os.environ["X509_USER_PROXY"] = "/home/bockjoo/.cmsuser.proxy"
os.environ["X509_USER_PROXY_NONCMS"] = "/home/bockjoo/.griduser.proxy"
os.environ["XRD_NETWORKSTACK"] = "IPv4"
with client.File() as f:
status, response = f.open("root://" + ENDPOINT + "/" + \
SAM_TEST_FILE, flags=OpenFlags.READ, timeout=90)
if ( not status.ok ):
print (("\nopen(root://%s/%s, flags=OpenFlags.READ,
time" + \
"out=90)\nXRootDStatus.code=%d \"%s\"\n") % \
(ENDPOINT, SAM_TEST_FILE, status.code, \
status.message.replace("\n", "")))
pass
status, data = f.read(offset=0, size=65536, timeout=90)
if ( not status.ok ):
print(("\n%s\nread(offset=0, size=65536, timeout=90)\n" + \
"XRootDStatus.code=%d \"%s\"\n") %
(SAM_TEST_FILE, \
status.code, status.message.replace("\n", "")))
pass
print ("Open Status",status.ok)
#############################################
You can choose the endpoint and the file of your choosing with the 5.5.5
server
to test it.
Thanks,
Bockjoo
On 8/28/23 09:33, Guilherme Amadio wrote:
> Dear Bockjoo,
>
> On Sat, Aug 26, 2023 at 04:14:28PM -0400, Bockjoo Kim wrote:
>> Hi,
>>
>> I am seeing a python XRootD file open issue for the 5.6.1 client with a
>> 5.5.5 server :
>>
>> =============================================================
>>
>> XRootD Client Versin 5.6.1
>> XRootD Server Version v5.5.5
>>
>> open(root://cmsio2.rc.ufl.edu:1094//store/mc/SAM/GenericTTbar/AODSIM/CMSSW_9_2_6_91X_mcRun1_realistic_v2-v1/00000/A64CCCF2-5C76-E711-B359-0CC47A78A3F8.root,
>> flags=OpenFlags.READ, timeout=90)
>> XRootDStatus.code=110 "[FATAL] TLS error: resource temporarily
>> unavailable: Unable to connect to cmsio2.rc.ufl.edu; error_ssl"
>>
>> ---------------------------------------------------------------------------
>> ValueError Traceback (most recent call last)
>> /tmp/ipykernel_4179061/812350213.py in <module>
>> 40 status.message.replace("\n", "")))
>> 41 #pass
>> ---> 42 status, data = f.read(offset=0, size=65536, timeout=90)
>> 43 if ( not status.ok ):
>> 44 print(("\n%s\nread(offset=0, size=65536,
>> timeout=90)\n" + \
>>
>> /opt/cms/services/anaconda3/lib/python3.9/site-packages/XRootD/client/file.py
>> in read(self, offset, size, timeout, callback)
>> 124 return XRootDStatus(self.__file.read(offset, size,
>> timeout, callback))
>> 125
>> --> 126 status, response = self.__file.read(offset, size, timeout)
>> 127 return XRootDStatus(status), response
>> 128
>>
>> ValueError: I/O operation on closed file
>>
>> ===============================================================
>>
>> Here, XRootD Server is configured with TLS.
>>
>> If I remove TLS configuration of the 5.5.5 server, there is no issue.
>>
>> If I switch to 5.5.5 client, there is no issue.
>>
>> Is this expected?
> It may or may not be. When I wrote the patch, I tested several scenarios
> (see https://github.com/xrootd/xrootd/pull/2031#issuecomment-1589380486).
> The error message that you see is likely caused by a client that cannot
> validate the server with TLS (because it does not have the proper CA
> certificates installed locally). So I suggest you to try with xrdcp
> --notlsok option, or export X509_CERT_DIR=/dev/null to force the client
> into not being able to do TLS at all. If the directory /etc/grid-security
> exists on your machine, but the client cannot verify the server, and TLS
> is enforced, then this behavior is expected. Otherwise, please export
> XRD_LOGLEVEL=Dump, re-run the command and send us the output so I can
> investigate this issue further. You may also want to install the proper
> certificates to let the client validate the server to be able to use
> TLS.
>
> Best regards,
> -Guilherme
########################################################################
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