Is 'zfs send' a safe read only command?

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I would allow server A to be backed up by server B, without allowing any server to modify the other server.



non-root user zfsbackup @ server A is allowed to use only zfs send:



# serverA: /etc/sudoers.d/zfsbackup 

zfsbackup ALL = (root) NOPASSWD: /sbin/zfs send *


Which makes it possible for server B to perform a backup of server A like this:



root@serverB~:# ssh zfsbackup@serverA sudo zfs send -i tank/vol@yesterday tank/vol@today | zfs receive tank/vol


Question is:




Can a malicious user do any damage using the zfs send * command? Or is this command completely read only?





security sudo zfs




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  • I understand that zfs delegation with zfs allow command is the preferred way to do this, but it is not available in ZoL 0.6.5.
    – John
    Dec 14 '17 at 16:30














up vote
1
down vote

favorite












I would allow server A to be backed up by server B, without allowing any server to modify the other server.



non-root user zfsbackup @ server A is allowed to use only zfs send:



# serverA: /etc/sudoers.d/zfsbackup 

zfsbackup ALL = (root) NOPASSWD: /sbin/zfs send *


Which makes it possible for server B to perform a backup of server A like this:



root@serverB~:# ssh zfsbackup@serverA sudo zfs send -i tank/vol@yesterday tank/vol@today | zfs receive tank/vol


Question is:




Can a malicious user do any damage using the zfs send * command? Or is this command completely read only?





security sudo zfs




share|improve this question




















  • I understand that zfs delegation with zfs allow command is the preferred way to do this, but it is not available in ZoL 0.6.5.
    – John
    Dec 14 '17 at 16:30












up vote
1
down vote

favorite









up vote
1
down vote

favorite











I would allow server A to be backed up by server B, without allowing any server to modify the other server.



non-root user zfsbackup @ server A is allowed to use only zfs send:



# serverA: /etc/sudoers.d/zfsbackup 

zfsbackup ALL = (root) NOPASSWD: /sbin/zfs send *


Which makes it possible for server B to perform a backup of server A like this:



root@serverB~:# ssh zfsbackup@serverA sudo zfs send -i tank/vol@yesterday tank/vol@today | zfs receive tank/vol


Question is:




Can a malicious user do any damage using the zfs send * command? Or is this command completely read only?





security sudo zfs




share|improve this question












I would allow server A to be backed up by server B, without allowing any server to modify the other server.



non-root user zfsbackup @ server A is allowed to use only zfs send:



# serverA: /etc/sudoers.d/zfsbackup 

zfsbackup ALL = (root) NOPASSWD: /sbin/zfs send *


Which makes it possible for server B to perform a backup of server A like this:



root@serverB~:# ssh zfsbackup@serverA sudo zfs send -i tank/vol@yesterday tank/vol@today | zfs receive tank/vol


Question is:




Can a malicious user do any damage using the zfs send * command? Or is this command completely read only?






security sudo zfs





share|improve this question











share|improve this question




share|improve this question










asked Dec 14 '17 at 16:26









John

83




83











  • I understand that zfs delegation with zfs allow command is the preferred way to do this, but it is not available in ZoL 0.6.5.
    – John
    Dec 14 '17 at 16:30
















  • I understand that zfs delegation with zfs allow command is the preferred way to do this, but it is not available in ZoL 0.6.5.
    – John
    Dec 14 '17 at 16:30















I understand that zfs delegation with zfs allow command is the preferred way to do this, but it is not available in ZoL 0.6.5.
– John
Dec 14 '17 at 16:30




I understand that zfs delegation with zfs allow command is the preferred way to do this, but it is not available in ZoL 0.6.5.
– John
Dec 14 '17 at 16:30










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Can a malicious user do any damage using the zfs send * command? Or is this command completely read only?




While the zfs send command doesn't modify the contents of the file-system, it's still possible for a malicious user to use it to DoS your system by saturating the file-system and sometimes the network, depending on how evil they choose to be.






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    up vote
    0
    down vote



    accepted











    Can a malicious user do any damage using the zfs send * command? Or is this command completely read only?




    While the zfs send command doesn't modify the contents of the file-system, it's still possible for a malicious user to use it to DoS your system by saturating the file-system and sometimes the network, depending on how evil they choose to be.






    share|improve this answer
























      up vote
      0
      down vote



      accepted











      Can a malicious user do any damage using the zfs send * command? Or is this command completely read only?




      While the zfs send command doesn't modify the contents of the file-system, it's still possible for a malicious user to use it to DoS your system by saturating the file-system and sometimes the network, depending on how evil they choose to be.






      share|improve this answer






















        up vote
        0
        down vote



        accepted







        up vote
        0
        down vote



        accepted







        Can a malicious user do any damage using the zfs send * command? Or is this command completely read only?




        While the zfs send command doesn't modify the contents of the file-system, it's still possible for a malicious user to use it to DoS your system by saturating the file-system and sometimes the network, depending on how evil they choose to be.






        share|improve this answer













        Can a malicious user do any damage using the zfs send * command? Or is this command completely read only?




        While the zfs send command doesn't modify the contents of the file-system, it's still possible for a malicious user to use it to DoS your system by saturating the file-system and sometimes the network, depending on how evil they choose to be.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Dec 16 '17 at 18:33









        Peter

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