How do files transferred via ftp or sftp gets thier permissions at destination?


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# 1  
Wrench How do files transferred via ftp or sftp gets thier permissions at destination?

We have umask defined under /etc/.login as 022.
I have my user specific umask defined in /userhome/.login as 002.
I understand ftp will not execute anything at destination, it simply transfers files.
But it seem to be using 022 as umask for the files transferred. How does ftp knows what umask to use, where does it get from on Solaris?

Code:
-rw-r--r-- 1 user group 2012 Jan 9 09:59 file.dat

# 2  
Check this :
Synopsis - man pages section 4: File Formats

You will need to define a class of user(s) and defumask, or just defumask.
This User Gave Thanks to Peasant For This Post:
# 3  
peasant thanks for point me in the right direction. I read that page, its not clear to me what the syntax is to create a class and define defumask.
I see that we have "/wh/etc/ftpd/ftpaccess".
If I have to allow group "allusers" to have 775 on folders and 664 on files transferred by uses that belong to "allusers" group, how would that look like?

Last edited by kchinnam; 01-09-2013 at 03:16 PM.. Reason: carification
# 4  
I have tried this with default solaris 11 install, but it doesn't work.

Seems like the default service proftpd with it's configuration file /etc/proftpd.conf
So you will need to modify that configuration file and add this or similar directive :
Code:
<Directory> /export/home/test>
Umask 007 007
AllowOverwrite on
</Directory

Now if user writes to /export/home/test it will create rw-rw---- (664).

Per user configuration is done with IFuser directive, but that requires mod_ifsession.c module loaded.

I'm still trying to figure out which ftp server solution actually uses /etc/ftpd/ftpaccess, will get back to you.

Update : Seems like in older versions of Solaris (before 11), ftpd is based on wu-ftpd which uses ftpaccess ftpusers files for configuration.

Hope this helped.
Regards
Peasant.

Last edited by Peasant; 01-10-2013 at 06:04 AM..
# 5  
Peasant,
I came across two possible solutions to this,, but could not try it yet as it requires root access and better understanding of how this works on solaris 8.

1.
use of defumask to control file permissions discussed here,,
NexentaStor Project - ftpd defumask - NexentaStor Project
it would be nice to get more explanation of how this works and how to do this for a specific user group or folder structure.

2.
Code:
# second one is possibly adding '-u 002'(default umask to ftpd to have 002 !?) to following entry to /etc/inetd.conf.
# But this may have unintended results as it may apply this to all ftp related uploaded files/folders on to the server.
# Since a server has multiple applications running and owned by different groups. how can we control this for a specific application user or group?
ftp stream tcp nowait <user/group?> /usr/sbin/tcpd /wh/sbin/in.ftpd -l -a -u 002


Last edited by kchinnam; 01-10-2013 at 11:52 AM.. Reason: formatting
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