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Data Management AUZN (mostly about SRM though)

Data Management AUZN (mostly about SRM though). GGF 16, Athens J Jensen <j.jensen@rl.ac.uk>. GIN!. “Gimme Interoperability Now!!”. SRB ISLAND. SRM ISLAND. SRB - IANASRBE. SRB is not SRM Different aims, different users SRB provides its own Data Grid AUCN: Username/password

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Data Management AUZN (mostly about SRM though)

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  1. Data Management AUZN(mostly about SRM though) GGF 16, Athens J Jensen <j.jensen@rl.ac.uk>

  2. GIN! “Gimme Interoperability Now!!” SRB ISLAND SRM ISLAND

  3. SRB - IANASRBE • SRB is not SRM • Different aims, different users • SRB provides its own Data Grid • AUCN: • Username/password • GSI for S commands (if compiled in) • Define id mapping… • Access control replicated with data • Group permissions

  4. SRM Overview • SRM is a file control protocol • GGF standard – GSM-WG • SOAP/HTTP over GSI sockets • Something else does the transfer • WAN: Usually GridFTP • LAN: “local” protocol (RFIO, DCAP,…)

  5. Implementations • “Special” ones – for specific tape MSS • JLAB, LBNL, CERN/RAL • General purpose (usually to disk) • DPM from CERN/LCG, • dCache from DESY/FNAL, • StoRM from INFN

  6. Designers: “ACL not a major priority” Implementers: Listen to users (often) Users: “ACL not a major priority” (HEP) Version 1.1 Secure (GSI), but… No functions for ACL Version 2.1 Unixy +rwxrwxrwx …POSIX SRM Versions

  7. Implementations

  8. File Transfer

  9. “Local” Protocols • Traditional insecure versions… • Use Unix UID for authentication • No data confidentiality (encryption) • Both RFIO and DCAP have GSI versions • Not always used by default • Need hostcerts for pool nodes • Don’t necessarily encrypt • GSI/SSL negotiations slow

  10. GridFTP Implementations • Use GSI authentication • Authorise by DN, using gridmap files • Don’t encrypt data by default • Or large transfers would be slow

  11. DPM 1.5 Improved Security • Integrated access control in nameserver • GridFTP, SRM, RFIO: consistent ACL • RFIO • GSI only • No Encryption • Performance vs confidentiality • POSIX ACLs • VOMS

  12. StoRM Security • Requires ACL capable filesystem • GPFS (, ext3, ReiserFS,…) • Being tested by INFN CNAF

  13. CASTOR 2 SRM • Access control not implemented yet • Will rely on CASTOR for ACL

  14. SRM Data Movers: Gaps • Data movers must update ACLs when moving data • Support SRM 2.1 • Some copy as user (delegated) • Some as a service • Not quite trivial • Data movers don’t have special privileges

  15. Back Doors? • File written via Grid can sometimes be read with local protocol • Or via SRM 1.1? • Privileged (root/admin) access • Storage Filename is often “random” • Rarely a concern

  16. Conclusions • GIN: Two Islands – SRM and SRB • WAN protocols secure (sort of) • But no data encryption by default • Increasingly, LAN protocols are secured • Implementations are available (sort of) • SRM 1.1 is still widely used

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