Public bug reported:
After an unattended upgrade to samba 2:4.7.6+dfsg~ubuntu-0ubuntu2.26 on
our fileserver, clients are not able to establish a connection to samba-
shares. The fileserver serves as a domain member server with an ldap on
a different machine (see output of testparm below).
Given the correct login credentials, the client responds with:
tree connect failed: NT_STATUS_ACCESS_DENIED
and the client specific samba-logfile on the fileserver will show:
[2021/12/09 15:04:29.783978, 0]
../source3/auth/auth_util.c:1259(check_account)
check_account: Failed to convert SID
S-1-2-34-5678910-11121314-15161718-192021 to a UID
(dom_user[MYDOMAIN\myusername])
A wrong password in a client throws:
session setup failed: NT_STATUS_LOGON_FAILURE
The config was working fine until the unattended upgrade from samba
2:4.7.6+dfsg~ubuntu-0ubuntu2.23 to 2:4.7.6+dfsg~ubuntu-0ubuntu2.26
I have tried to reproduce the behaviour on an Ubuntu 20.04.3 LTS with
samba 4.13.14 and ran into the same error.
This is the testparm output of the fileserver:
# Global parameters
[global]
client min protocol = default
dns proxy = No
log file = /var/log/samba/log.%m
map to guest = Bad User
max log size = 1000
pam password change = Yes
panic action = /usr/share/samba/panic-action %d
passwd chat = *Enter\snew\s*\spassword:* %n\n
*Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .
passwd program = /usr/bin/passwd %u
password server = 12.345.678.9
security = DOMAIN
server min protocol = SMB2
server role = member server
server string = MYDOMAIN Fileserver
syslog = 0
unix extensions = No
unix password sync = Yes
usershare allow guests = Yes
workgroup = WG_TECH
idmap config * : backend = tdb
veto files = /someVetoFile/moreVetoFiles/
wide links = Yes
** Affects: samba (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1954342
Title:
Client authentication error "Failed to convert SID ... to a PID"
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