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rsync problems and security concerns

rated 0 times [ 0] [ 0] / answers: 1 / hits: 3032 / 1 Year ago, tue, january 10, 2023, 11:58:12

Hi I am attempting to use rsync to copy files between two linux servers. both on 10.04.4

I have set up the ssh and a script running under a cron job. this is the message i get back from the cron job.

To: mark@ubuntu Subject: Cron ~/rsync.sh Content-Type:
text/plain; charset=ANSI_X3.4-1968 X-Cron-Env:
X-Cron-Env: X-Cron-Env:
X-Cron-Env: Message-Id:
<20120708183802.E0D54FC2C0@ubuntu> Date: Sun, 8 Jul 2012 14:38:01
-0400 (EDT)

rsync: link_stat "/home/mark/#342#200#223rsh=ssh" failed: No such
file or directory (2) rsync: opendir
"/Library/WebServer/Documents/.cache" failed: Permission denied (13)
rsync: recv_generator: mkdir "/Library/Library" failed: Permission
denied (13)
* Skipping any contents from this failed directory * rsync error: some files/attrs were not transferred (see previous errors) (code 23)
at main.c(1060) [sender=3.0.7]

Q.1 can anyone tell me why I get this message -->

rsync: link_stat "/home/mark/#342#200#223rsh=ssh" failed: No such file or directory (2)

the script is:

    #!/bin/bash

SOURCEPATH='/Library'

DESTPATH='/Library'

DESTHOST='192.168.1.15'

DESTUSER='mark'

LOGFILE='rsync.log'

echo $'



' >> $LOGFILE

rsync -av –rsh=ssh $SOURCEPATH $DESTUSER@$DESTHOST:$DESTPATH 2>&1 >> $LOGFILE

echo “Completed at: `/bin/date`” >> $LOGFILE

Q2. I know I have several problems with the permissions all of the files I am copying usually require me to use sudo to manipulate them. My question is then is there a way i can run this job without giving my user root access or using root in the login ??

Thanks for the help .

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answered 1 Year ago teromato · Accepted Answer

As for Q1 I'm guessing that you have put the double dash before "rsh" in as an "en-dash", i.e. a single character: — so rsync is interpreting it as a filename rather than an option to the program.

For Q2 if you want to give a non-root user permission to do things with files it wouldn't otherwise be able to manipulate you're either going to have to change the permissions of the files or elevate the permissions of the user, e.g. through use of sudo.

sudo can be configured to allow certain users to execute certain commands as root with no password prompt, so the thing you need to do is separate out the things you need to do as root into a script which does them (and only them), and then allow that script to be called as root. Here is an example from one of my /etc/sudoers files:

Cmnd_Alias      F2B_CLIENT_PING = /usr/bin/fail2ban-client ping

nagios          ALL             = NOPASSWD: F2B_CLIENT_PING

What the above does is allows the "nagios" user to execute "/usr/bin/fail2ban-client ping" as root using sudo, without being prompted for a password. I use it in my monitoring.

You'd have something like:

Cmnd_Alias RSYNC_BACKUP = /usr/local/sbin/backup_my_stuff_with_rsync.sh

youruser   ALL          = NOPASSWD: RSYNC_BACKUP

and then in your cron you'd call sudo /usr/local/sbin/backup_my_stuff_with_rsync.sh

You can test it on the command line first to verify that it doesn't ask for password.

Note that running a script as root is a big deal and so you must ensure that your script is secure and correct. If you can find any way to do this as non-root, that would be better.