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SLM: Slice Login Manager

Ritun Patney, Fred Kuhns. SLM: Slice Login Manager. SLM Design. drn01 ‘slice pl_techx01’. Host based. host. SLM (sshd) ‏. User ‘xyz’. ssh –l pl_techx01. Slice login mappings. ~pl_techx01/.ssh/authorized_keys2. xyz – pub key. pl_techx01 = drn01. Host based authentication.

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SLM: Slice Login Manager

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  1. Ritun Patney, Fred Kuhns SLM: Slice Login Manager

  2. SLM Design drn01 ‘slice pl_techx01’ Host based host SLM (sshd)‏ User ‘xyz’ ssh –l pl_techx01 Slice login mappings ~pl_techx01/.ssh/authorized_keys2 xyz – pub key pl_techx01 = drn01

  3. Host based authentication • Client Side (SRM)‏ • Copy server key from server::/etc/ssh/ssh_host_key_rsa.pub to /etc/ssh/ssh_known_hosts in the foll. format • drn01.arl.wustl.edu,128.2.3.4 ssh-rsa AAxxxxx • Enable host based authentication by editing /etc/ssh/ssh_config file to include • Host * • EnableSSHKeysign yes • HostbasedAuthentication yes

  4. Host Based Authentication • Server Side (GPEs)‏ • Enable it in /etc/ssh/sshd_config file • HostbasedAuthentication yes • Add public key of client to /etc/ssh/ssh_known_hosts as • slm.arl.wustl.edu,128.22.13.4 ssh-rsa AAxxxxx • Add the following line to /etc/ssh/shosts.equiv • +ebony.arl.wustl.edu • Any user logged in at ebony will be able to login with the same login name

  5. Slice Information • SRM writes slice info • /etc/planetlab/db • Contains information on current active slices • File Format [ slice_name ] PlabID= gpeIP= key0= . . keyn= [ slice_name ] PlabID= gpeIP= key0= . . keyn=

  6. Example File [ pl_techx04 ] PlabID=12 gpeIP=172.16.1.5 key0=ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA4ko5aNtvfSJwzilBrzmsqPf4S1BttcxgO9sJp key1=ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAztellgkIwPoS+p0Dqj9nkcuVcj7qK0GsSjbC3 key2=ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAvszPitee7pHIwC8+47RmPa0pdcBkkz5Gl8v4i [ pl_techx01 ] PlabID=11 gpeIP=172.16.1.1 key0=ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAztellgkIwPoS+p0Dqj9nkcuVcj7qK0GsSjbC3 key1=ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA4ko5aNtvfSJwzilBrzmsqPf4S1BttcxgO9sJp key2=ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAvszPitee7pHIwC8+47RmPa0pdcBkkz5Gl8v4i

  7. Processing slice information • Open /etc/planetlab/db • Find file size, allocate and read into buffer, close file • Maintain 2 lists • new_slice_list • old_slice_list • Do a qsort on new_slice_list

  8. Compare ordered linked lists “new_slice_list” and “old_slice_list” • Remove login for any slice in old_slice_list but not in new_slice_list • Call “userdel” to remove the user, entry from passwd file • Delete the home directory • Set old_slice_list = new_slice_list

  9. Processing slice information • For every active slice: • Call “useradd” to create user with the slicename • Set login to /sbin/nologin • Read the GPE IP and store in mappings_buffer • slicename=gpeip • Read keys into keys_buffer • Overwrite ~slicename/.ssh/authorized_keys2 file with keys_buffer • Overwrite mappings file (/etc/planetlab/gpe_mappings) used by sshd with contents of mappings_buffer

  10. Misc • To avoid opening files for long, every file read is first copied as a .tmp file. • SLM reads /etc/passwd file at start, removes any user starting with “pl_”. • Runs every 30s.

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