Problem with tftp server

[R C]

On 1/29/22 08:10, Jerry Geis wrote:
>
>
> On Fri, Jan 28, 2022 at 5:24 PM R C <cjvijf at gmail.com> wrote:
>
>
>     On 1/28/22 15:07, Tommy Trussell wrote:
>>     On Fri, Jan 28, 2022 at 12:26 PM Jerry Geis
>>     <jerry.geis at gmail.com> wrote:
>>
>>
>>
>>         On Thu, Jan 27, 2022 at 11:03 PM Tommy Trussell
>>         <tommy.trussell at gmail.com> wrote:
>>
>>
>>             I have not used tftp in awhile, but have you checked the
>>             permissions on the file "jerry" in /tftpboot ? The file
>>             may be invisible to the daemon due to the wrong group or
>>             file permissions.
>>
>>             You might also try to put a different file onto the
>>             server using tftp and see what permissions the resulting
>>             file has.
>>
>>             The man page for your version of tftpd will likely
>>             contain some useful information.
>>
>>
>>         HI Tommy,
>>
>>         The file has permission:
>>         -rw-r--r-- 1 root    root         8 Nov 21 20:11 jerry
>>
>>         The directory has:
>>         drwxrwxrwx   2 root root      12288 Nov 21 20:11 tftpboot
>>
>
>     How do you start the tftp service/server?   If not mistaken, by
>     default it expects the tftpboot directory in /var/lib
>     (/var/lib/tftpboot)  when you start the server/service  the -s
>     option tells it where to find it's root
>
>
>
>
>>
>>         Seems like that should be readble by all?
>>
>>         Thanks
>>         Jerry
>>
>>
>>     I was under the impression that most implementations of tftp are
>>     very picky about the permissions and I would think they would NOT
>>     share any files owned by root.
>>
>>     For example see if there's a tftp group already created and maybe
>>     chown the file (and maybe its directory) to tftp:tftp ?
>>
>>     Does the man page for your version of tftpd say anything about
>>     the default permissions?
>>
>>     Also I suggested you try using a client to put a file in the
>>     server's directory. What permissions does it give that file? I
>>     would think it might be the same permissions needed for reading a
>>     file.
>>
>>     If you can't tell I'm stabbing in the dark but suggesting how I
>>     would go about it. I ALWAYS start with the man page. The
>>     information might be inscrutable, but there's usually some nugget
>>     of information that gets me closer to understanding.
>>
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>
>
> hi All,
>
> I am starting the tftpd by xinetd.
>
>  more /etc/xinetd.d/tftp
> # default: off
> # description: The tftp server serves files using the trivial file 
> transfer \
> # protocol.  The tftp protocol is often used to boot diskless \
> # workstations, download configuration files to network-aware printers, \
> # and to start the installation process for some operating systems.
> service tftp
> {
> socket_type = dgram
> protocol = udp
> wait = yes
> user = root
> server = /usr/sbin/in.tftpd
> server_args = -s /tftpboot
> disable = no


I have disabled = yes    I never paid attentio to that

I use tftp for  configuring cisco switches and routers.  I recall having 
a permissions issue.  But I first set everything up, in separate 
subdirectories,  then restarted  the service and it 'just' started working.

this is what I have (it's a RHEL/Centos box though, it still (Centos 7 
and RHEL 8)


service tftp
{
     socket_type        = dgram
     protocol        = udp
     wait            = yes
     user            = root
     server            = /usr/sbin/in.tftpd
     server_args        = -s /var/lib/tftpboot
     disable            = yes
     per_source        = 11
     cps            = 100 2
     flags            = IPv4
}

# ls -al /var/lib/tftpboot/
total 4
drwxr-xr-x   4 root root   33 Oct  1  2020 .
drwxr-xr-x. 38 root root 4096 Feb 13  2021 ..
drwxr-xr-x   4 root root   30 Oct  1  2020 backups
drwxr-xr-x   2 root root  291 Jul  4  2021 dhcp

# ls -al /var/lib/tftpboot/dhcp/static-bindings-hw-1
-rw-r--r-- 1 root root 3017 Jul  4  2021 
/var/lib/tftpboot/dhcp/static-bindings-hw-1


that works on both machines.


Does it work with the firewall stopped?



> per_source = 11
> cps = 100 2
> flags = IPv4
> }
>
>
>
> I tried to "put" a file - and same thing happens that I get a 
> timeout... (good thought).
>
> I also tried to change the permsissions to be non-root - no 
> difference. Still Timeout.
>
> I looked at the man page for tftpd. nothing there about permissions 
> and not thing there other than option -n and -s .
>
> Thoughts?
>
> Jerry
>
>
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