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authorIgor Pashev <pashev.igor@gmail.com>2012-12-31 05:04:42 +0400
committerIgor Pashev <pashev.igor@gmail.com>2012-12-31 05:04:42 +0400
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+The Remote-SCSI protocol gives you SCSI-Anywhere features.
+
+The protocol used by netscsid is based on rscsi from the cdrtools, developed by
+Joerg Schilling. However, no guarantee for the compatibility or reliability can
+be made. This documentation is based on rscsi documentation from Joerg
+Schilling, but is not identical to the original.
+
+There are three possible ways to control access to the remote users:
+
+ - Let the remote scsi lib log in as a standard user.
+ In this case netscsid will be called via sh -c netscsid /usr/sbin/netscsid
+ NOTE: In this case, netscsid must be installed suid root.
+ --- This would need to allow any valid local user to access SCSI ----
+ It could be a security problem.
+
+ - Log in as root and call netscsid via sh -c netscsid
+ NOTE that this will fore you to allow remote logins as root
+ which is considered to be a security hole.
+
+ - Create one or more special user(s) that have netscsid
+ as login shell with their own home directory.
+ You then may create special .rhosts files for each user.
+ NOTE: In this case, netscsid must be installed suid root.
+ **** This is the preferred method ****
+
+To enable remote SCSI via the login shell method you should do the following:
+
+ - Install netscsid into /usr/sbin. It can be set suid-root if neccessary, see
+ security section below.
+
+ - Install a file /etc/netscsid.conf and define access rights.
+ Without this file, netscsid will not work at all.
+ The template for this file is: netscsid/netscsid.dfl
+
+ - For the special user method, create a user account. This can be done with a
+ frontend like adduser or useradd, if available. The user should have /usr/sbin/netscsid as the login shell.
+ If there is no frontend tool, try this:
+
+ + Add an entry to /etc/passwd in the form:
+
+ netscsid:x:1999:1000:Tape:/home/netscsid:/usr/sbin/netscsid
+
+ (modify this according to your OS). And don't forget to
+ modify /etc/shadow the way it needs to be on your OS.
+
+ + Create the home directory for this user, adapt the user/group ownership
+ on this directory.
+
+ - if you use SSH as the login shell (via appropriate RSH environment variable
+ or a symlink to "rsh" which is the case for many Linux distribution),
+ consult the ssh documentation for details.
+ Note that SSH requires sufficiently powered client/server systems to
+ encrypt/decrypt data in realtime.
+
+ - if you use traditional rsh, add a .rhosts file to this directory to allow
+ access to all users you like (see rsh documentation)
+
+NETSCSID Security:
+
+- When netscsid starts, it checks if /etc/netscsid.conf exists.
+ If not, it dies.
+
+- If netscsid is not called by a user listed in /etc/netscsid.conf
+ it dies.
+
+- To access a SCSI target there must be an entry that lists the user
+ rcsi hast been started from, the hostname and the SCSI target.
+
+ netscsid compares the hostname field in /etc/netscsid.conf
+ to the peername retrived from STDIN:
+
+ - legal host name IP connection
+ - "ILLEGAL_SOCKET" Not an IP socket
+ - "NOT_IP" Not a socket
+
+NETSCSID Security hints:
+
+- Do not generally allow other users to see your boot disk via NETSCSID.
+ All people who see this disk may edit your passwd file. This especially
+ applies to suid-root usage. For non-suid-root, check the access permissions.
+
+- If you are in doubt, only export CD-ROM drives, scanners and similar
+ devices that are not directly security sensitive.
+
+If anybody sees a security hole in my security precautions, please send me a mail!
+
+NETSCSID usage:
+
+- To use remote SCSI devices you need to know how to access a specific remote
+ SCSI target.
+
+ - dev=REMOTE:host: or dev=REMOTE:host
+ will allow you to do SCSI bus scanning while you log in as yourself
+
+ - dev=REMOTE:user@host: or dev=REMOTE:user@host
+ will allow you to do SCSI bus scanning while you log in as "user"
+
+ If you use the setup described above, you should use:
+
+ dev=REMOTE:netscsid@babbel:
+
+ to do SCSI Bus scanning on host babbel
+
+ - To access a specific SCSI device, you must specify
+ dev=REMOTE:host:<target spec> or dev=REMOTE:user@host:<target spec>
+ <target spec> is the SCSI target specification as it is needed
+ on the remote host
+
+ dev=REMOTE:netscsid@babbel:1,3,0
+
+ Will let you log in as netscsid on host babbel and open Target 3 lun 0
+ on SCSI bus #1
+
+ - If you use wodim -vv ...., wodim will on startup print some
+ information about the remote libscg version used for the connection.
+
+- To be able to use the remote SCSI client code from win32 you need to create
+ a file /etc/passwd with a correct entry for the user you are on win32.
+ Call 'id' to get the right user id.
+ Note that remote SCSI has not yet been tested on Win32.
+
+NETSCSID speed:
+
+- On a Ultra-10 running Solaris 8, the command overhead time is 400 usec.
+ You may achieve up to 9900 kB/s via a 100MB/s ethernet connection
+ between two of such machines.
+
+- With 100 MB/s, 12x recording should be no problem.
+
+- With 10 MB/s, 4x recording is the maximum. Do tests before!
+
+- Logging into a remote machine and running wodim on the remote machine
+ causes the buffer cache on that machine to be trashed. The main user
+ is disturbed.
+
+- Doing cdrecording via Remote SCSI causes only the netscsid command with less
+ than 200kB to be needed on the remote machine hosting the CD recorder.
+ The main user on that machine is not disturbed.
+ The buffer cache of the machine running wodim is trashed.
+
+- It is desirable to use a Burn-Proof recorder to make sure that network
+ load will not cause buffer underruns.
+
+
+- USER= test and test for hostname are using a pattern matcher.