Public bug reported:
I'm trying to set up a CIFS mount with 'cruid' and 'multiuser' so I can
use autofs, and 'vers=1.0' so I can use unix extensions. The samba
server uses kerberos tickets for authentication.
When I try to run the mount, it appears to ignore the cruid flag and
instead check root's kerberos ticket cache. If I use 'vers=2.0' instead
of 1.0, the mount works as expected, but I lose the unix extensions.
Nothing that I can find in the documentation indicates that I shouldn't
be able to use these flags together.
Failed session example: Note that the upcall is checking creduid=0, when I'm
asking it to use 1000
root@syllepsis:~# mount //hostname/users /mnt/test -v
-omultiuser,cruid=1000,vers=1.0,sec=krb5
mount.cifs kernel mount options:
ip=192.168.0.10,unc=\\hostname\users,multiuser,vers=1.0,sec=krb5,cruid=1000,user=root,pass=********
mount error(13): Permission denied
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs
Oct 22 13:59:00 syllepsis cifs.upcall: key description:
cifs.spnego;0;0;39010000;ver=0x2;host=hostname;ip4=192.168.0.10;sec=krb5;uid=0x0;creduid=0x0;pid=0xdcb
Oct 22 13:59:00 syllepsis cifs.upcall: ver=2
Oct 22 13:59:00 syllepsis cifs.upcall: host=hostname
Oct 22 13:59:00 syllepsis cifs.upcall: ip=192.168.0.10
Oct 22 13:59:00 syllepsis cifs.upcall: sec=1
Oct 22 13:59:00 syllepsis cifs.upcall: uid=0
Oct 22 13:59:00 syllepsis cifs.upcall: creduid=0
Oct 22 13:59:00 syllepsis cifs.upcall: pid=3531
Oct 22 13:59:00 syllepsis cifs.upcall: get_cachename_from_process_env: pid == 0
Oct 22 13:59:00 syllepsis cifs.upcall: get_existing_cc: default ccache is
FILE:/tmp/krb5cc_0
Oct 22 13:59:00 syllepsis cifs.upcall: get_tgt_time: unable to get principal
Oct 22 13:59:00 syllepsis cifs.upcall: Exit status 1
Oct 22 13:59:00 syllepsis kernel: [61476.071633] CIFS VFS: Send error in
SessSetup = -126
Oct 22 13:59:00 syllepsis kernel: [61476.071648] CIFS VFS: cifs_read_super: get
root inode failed
Successful Session with smb version 2.0:
root@syllepsis:~# mount //hostname/users /mnt/test -v
-omultiuser,cruid=1000,vers=2.0,sec=krb5
mount.cifs kernel mount options:
ip=192.168.0.10,unc=\\hostname\users,multiuser,vers=2.0,sec=krb5,cruid=1000,user=root,pass=********
Oct 22 14:00:44 syllepsis cifs.upcall: key description:
cifs.spnego;0;0;39010000;ver=0x2;host=hostname;ip4=192.168.0.10;sec=krb5;uid=0x0;creduid=0x3e8;user=root;pid=0xf20
Oct 22 14:00:44 syllepsis cifs.upcall: ver=2
Oct 22 14:00:44 syllepsis cifs.upcall: host=hostname
Oct 22 14:00:44 syllepsis cifs.upcall: ip=192.168.0.10
Oct 22 14:00:44 syllepsis cifs.upcall: sec=1
Oct 22 14:00:44 syllepsis cifs.upcall: uid=0
Oct 22 14:00:44 syllepsis cifs.upcall: creduid=1000
Oct 22 14:00:44 syllepsis cifs.upcall: user=root
Oct 22 14:00:44 syllepsis cifs.upcall: pid=3872
Oct 22 14:00:44 syllepsis cifs.upcall: get_cachename_from_process_env:
pathname=/proc/3872/environ
Oct 22 14:00:44 syllepsis cifs.upcall: get_existing_cc: default ccache is
FILE:/tmp/krb5cc_1000
Oct 22 14:00:44 syllepsis cifs.upcall: handle_krb5_mech: getting service ticket
for hostname
Oct 22 14:00:44 syllepsis cifs.upcall: handle_krb5_mech: obtained service ticket
Oct 22 14:00:44 syllepsis cifs.upcall: Exit status 0
System information:
lsb_release -rd
Description: Ubuntu 18.04.1 LTS
Release: 18.04
uname -a
Linux syllepsis 4.15.0-36-generic #39-Ubuntu SMP Mon Sep 24 16:19:09 UTC 2018
x86_64 x86_64 x86_64 GNU/Linux
mount.cifs -V
mount.cifs version: 6.8
apt-cache policy cifs-utils
cifs-utils:
Installed: 2:6.8-1
Candidate: 2:6.8-1
Version table:
*** 2:6.8-1 500
500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
100 /var/lib/dpkg/status
** Affects: cifs-utils (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1799268
Title:
CIFS option 'cruid' does not appear to work properly with 'multiuser'
and 'vers=1.0'
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