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XROOTD-L  May 2021

XROOTD-L May 2021

Subject:

Re: Error message "no delegated credentials for tpc"

From:

"Yang, Wei" <[log in to unmask]>

Reply-To:

Support use of xrootd by HEP experiments <[log in to unmask]>

Date:

Fri, 14 May 2021 19:00:54 +0000

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (1 lines)

HI Yvan,

There are several reasons: 

1. The server or client is pretty old (4.8 and older if I remember correctly). In that case, one side (or both) does not sign the Diffie-Hellman parameters (which is used to estiblish symmetric encryption keys). 
2. The server host name used by the client is a DNS alias that is not in the server host certificate's SAN entries. I forgot whether this will result in a message like "no delegated credentials for tpc", but it is one of the common reasons that fails the credential delegation.

regards,
--
Wei Yang  |  [log in to unmask]  |  650-926-3338(O)

-----Original Message-----
From: <[log in to unmask]> on behalf of <[log in to unmask]>
Date: Friday, May 14, 2021 at 5:05 AM
To: <[log in to unmask]>
Subject: Error message "no delegated credentials for tpc"

    Dear XRootD developers, 
    
    TPC transfers using Dirac replication actually fail with the error message "no delegated credentials for tpc". I therefore checked the log files on the redirector and the server: 
    
    * From the redirector myredirec:
    
    210514 12:24:56 27573 secgsi_ServerDoCert: no signed DH parameters from client:kdf77245.17467:[log in to unmask] : will not delegate x509 proxy to it
    210514 12:24:56 27573 secgsiVOMS_Fun: proxy: /C=UK/O=eScience/OU=Oxford/L=OeSC/CN=john doe/CN=zzzzzz/CN=tttttt
    210514 12:24:56 27573 secgsiVOMS_Fun: adding cert: /C=UK/O=eScience/OU=Oxford/L=OeSC/CN=john doe/CN
    =zzzzzz
    210514 12:24:56 27573 secgsiVOMS_Fun: adding cert: /C=UK/O=eScience/OU=Oxford/L=OeSC/CN=john doe
    210514 12:24:56 27573 secgsiVOMS_Fun: retrieval successful
    210514 12:24:56 27573 secgsiVOMS_Fun: found VO: t2k.org
    210514 12:24:56 27573 secgsiVOMS_Fun:  ---> group: '/t2k.org', role: 'NULL', cap: 'NULL'
    210514 12:24:56 27573 secgsiVOMS_Fun:  ---> fqan: '/t2k.org/Role=NULL/Capability=NULL'
    210514 12:24:56 27573 XrootdXeq: kdf77245.17467:[log in to unmask] pub IP64 login as 19478b73.0
    210514 12:24:56 8601 Receive myredirec 24 bytes on 85128180
    210514 12:24:56 8601 Decode myredirec redirects kdf77245.17467:[log in to unmask] to myserv.in2p3.fr:1094 /xrootd/in2p3.fr/disk/t2k.org/t2k.org/test/t2kdm
    210514 12:24:56 8602 Receive [2001:660:5009:84:134:158:239:108] 24 bytes on 85129204
    210514 12:24:56 8602 Decode myredirec redirects kdf77245.17467:[log in to unmask] to myserv.in2p3.fr:1094 /xrootd/in2p3.fr/disk/t2k.org/t2k.org/test/t2kdm/test1.txt
    210514 12:24:57 27573 XrootdXeq: kdf77245.17467:[log in to unmask] disc 0:00:01
    
    * From the server myserv: 
    
    210514 12:24:56 223744 secgsi_ServerDoCert: no signed DH parameters from client:kdf77245.17467:[log in to unmask] : will not delegate x509 proxy to it
    210514 12:24:56 223744 secgsiVOMS_Fun: proxy: /C=UK/O=eScience/OU=Oxford/L=OeSC/CN=john doe/CN=zzzzzz/CN=tttttt
    210514 12:24:56 223744 secgsiVOMS_Fun: adding cert: /C=UK/O=eScience/OU=Oxford/L=OeSC/CN=john doe/CN=zzzzzz
    210514 12:24:56 223744 secgsiVOMS_Fun: adding cert: /C=UK/O=eScience/OU=Oxford/L=OeSC/CN=john doe
    210514 12:24:56 223744 secgsiVOMS_Fun: retrieval successful
    210514 12:24:56 223744 secgsiVOMS_Fun: found VO: t2k.org
    210514 12:24:56 223744 secgsiVOMS_Fun:  ---> group: '/t2k.org', role: 'NULL', cap: 'NULL'
    210514 12:24:56 223744 secgsiVOMS_Fun:  ---> fqan: '/t2k.org/Role=NULL/Capability=NULL'
    210514 12:24:56 223744 XrootdXeq: kdf77245.17467:[log in to unmask] pub IP64 login as 19478b73.0
    210514 12:24:56 223744 ofs_TPC: kdf77245.17467:[log in to unmask] Unable to open /xrootd/in2p3.fr/disk/t2k.org/t2k.org/test/t2kdm/test1.txt; no delegated credentials for tpc
    210514 12:24:57 223744 XrootdXeq: kdf77245.17467:[log in to unmask] disc 0:00:01
    
    
    I am not sure what the error message "no signed DH parameters from client:kdf77245.17467:[log in to unmask] : will not delegate x509 proxy to it" means. Is it something wrong on the client side at UK ("kdf77245.17467:[log in to unmask]") and how to solve this problem? 
    
    Note that from my side, the redirectors and servers have the following TPC settings: 
    
    ofs.tpc fcreds gsi =X509_USER_PROXY ttl 60 70 xfr 20 autorm pgm /usr/share/xrootd/utils/xrdcp-tpc.sh
    sec.protocol /usr/lib64 gsi -dlgpxy:1 -exppxy:=creds -ca:1 -crl:3 -gridmap:/dev/null
    
    with: 
    
    $ cat /usr/share/xrootd/utils/xrdcp-tpc.sh
    #!/bin/sh
    /usr/bin/xrdcp --server -f $1 $2
    
    Last but not least, direct uploads from UK to CC-IN2P3 are working fine for VO T2K.
    
    Thanks for your help,
    
    Yvan
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