On Wed, Jun 16, 2021 at 05:23:20PM -0400, Wietse Venema wrote: > Jeremiah Rothschild: > > Hello, > > > > I have an alias that is supposed to write to a file but it is not. > > > > * OS: CentOS 8.4.2105 x64 (fully updated) > > * Kernel: 4.18.0-305.3.1.el8.x86_64 > > * Postfix: 3.5.8-1.el8.x86_64 (default config w/ verbose logging) > > > > Very basic /etc/aliases: > > [root@c8vm ~]# cat /etc/aliases > > somealias: /tmp/somefile > > > > I send a test which looks successful: > > Jun 16 13:21:23 c8vm postfix/local[57869]: 72F0380292: > > to=<somealias@localhost>, relay=local, delay=0.13, delays=0.09/0.01/0/0.02, > > dsn=2.0.0, status=sent (delivered to file: /tmp/somefile) > > > > but it was not: > > [root@c8vm ~]# ls -l /tmp/somefile > > ls: cannot access '/tmp/somefile': No such file or directory > > [root@c8vm ~]# ls -ld /tmp > > 4 drwxrwxrwt. 10 root root 4096 Jun 16 13:38 /tmp/ > > According to your logs, Postfix delivers the file as (uid 65534 > gid 65534). HOWEVER, you are looking at /tmp as a different user.
Thanks for the reply! Yes, postfix delivers as user nobody (id 65534). > Postfix assumes that /tmp is shared, that is, when Postfix writes > a file to /tmp, then some other user (you) can access that same > file by the same name. > > I suspect that your system may have per-user tmpfs. /tmp is a separate filesystem: [root@c8vm ~]# grep tmp /etc/fstab /dev/mapper/rootvg-tmp /tmp ext4 defaults 1 2 [root@c8vm ~]# df -h /tmp Filesystem Size Used Avail Use% Mounted on /dev/mapper/rootvg-tmp 2.0G 6.1M 1.8G 1% /tmp and it appears the same as a root and non-root user: [root@c8vm ~]# id uid=0(root) gid=0(root) groups=0(root) [root@c8vm ~]# touch /tmp/testfile [root@c8vm ~]# su jeremiah [jeremiah@c8vm /root]$ ls -l /tmp/testfile -rw-r--r-- 1 root root 0 Jun 16 14:30 /tmp/testfile Am I misunderstanding your idea? > Wietse > > > The full verbose maillog can be viewed @ https://pastebin.com/raw/hAi1gCBA. > > > > The `postconf -n` and `postconf -Mf` outputs can be viewed @ > > https://pastebin.com/raw/MDGB05CB. > > > > Thanks for any help! > > > > j > >
