smbspool without authentication no longer works?

[Andreas Hasenack]

Hi,

is smbspool supposed to work without authentication, in the case the
printer is shared like that?

I've been tracking some bug reports about printing no longer working
with samba 4.8 or higher. The last one where I got this command below
to work was 4.7.6:

ubuntu at bionic-smb-printer:~$ /usr/lib/cups/backend/smb
smb://10.10.1.6/ds216laser 34 root page 1 options .bashrc;echo
Kerberos auth with 'root at WORKGROUP' (WORKGROUP\root) to access
'10.10.1.6' not possible
ERROR: Session setup failed: NT_STATUS_ACCESS_DENIED
DEBUG: get_exit_code(cli=0x561bb8db7d70,
nt_status=NT_STATUS_ACCESS_DENIED [c0000022])
ATTR: auth-info-required=negotiate
DEBUG: Connected with NTLMSSP...

ubuntu at bionic-smb-printer:~$ echo $?
0

With, say, 4.10.7, I get:
root at nsnx:~# /usr/lib/cups/backend/smb smb://10.10.1.6/ds216laser 34
root page 1 options .bashrc; r=$?;echo;echo $r
kerberos_ccache_is_valid: Failed to get default principal from ccache:
FILE:/tmp/krb5cc_0
DEBUG: This backend requires credentials!
DEBUG: get_exit_code(nt_status=NT_STATUS_ACCESS_DENIED [c0000022])
ATTR: auth-info-required=none
DEBUG: Unable to connect to CIFS host: NT_STATUS_ACCESS_DENIED
2

If I pass "anonymous" as the username, or even a blank space (!), then it works:
root at nsnx:~# /usr/lib/cups/backend/smb smb://\ @10.10.1.6/ds216laser
34 root page 1 options .bashrc; r=$?;echo;echo $r
DEBUG: SMB connection established.

0


I found several bug reports, but none seems to address this issue
exactly. Some were about printing with kerberos.
https://bugzilla.samba.org/show_bug.cgi?id=13832
https://bugzilla.samba.org/show_bug.cgi?id=13939
https://bugzilla.samba.org/show_bug.cgi?id=13970
https://bugzilla.redhat.com/show_bug.cgi?id=1700791
https://bugzilla.redhat.com/show_bug.cgi?id=1706090