[Samba] Apparent conflict between shadow_copy and virusfilter modules

Wed Jun 12 14:24:51 UTC 2024

Hello

I'm having a problem using the virusfilter and shadow_copy2 modules which,
unless I'm mistaken, seems like a conflict between these modules. If I use
the virusfilter, acl_xattr, recycle, shadow_copy2 and full_audit modules
together, everything works perfectly, if I use the NOTHING, RENAME or
DELETE actions of the virusfilter module. If I choose to use the QUARANTINE
action for the virusfilter module, I lose access to my shares and the
following messages appear in the logs:

[2024/06/12 07:49:27.549438,  0]
source3/modules/vfs_shadow_copy2.c:1180(shadow_copy2_stat)
  shadow_copy2_stat() failed to get vfs_handle->data!
[2024/06/12 07:49:27.549795,  0]
source3/modules/vfs_shadow_copy2.c:1180(shadow_copy2_stat)
  shadow_copy2_stat() failed to get vfs_handle->data!
[2024/06/12 07:49:27.550885,  0]
source3/modules/vfs_shadow_copy2.c:1180(shadow_copy2_stat)
  shadow_copy2_stat() failed to get vfs_handle->data!
[2024/06/12 07:49:27.551026,  0]
source3/modules/vfs_shadow_copy2.c:1180(shadow_copy2_stat)
  shadow_copy2_stat() failed to get vfs_handle->data!
[2024/06/12 07:49:27.552212,  0]
source3/modules/vfs_shadow_copy2.c:1180(shadow_copy2_stat)
  shadow_copy2_stat() failed to get vfs_handle->data!
[2024/06/12 07:49:27.552344,  0]
source3/modules/vfs_shadow_copy2.c:1180(shadow_copy2_stat)
  shadow_copy2_stat() failed to get vfs_handle->data!
[2024/06/12 07:49:27.553955,  0]
source3/modules/vfs_shadow_copy2.c:1180(shadow_copy2_stat)
  shadow_copy2_stat() failed to get vfs_handle->data!
[2024/06/12 07:49:27.554074,  0]
source3/modules/vfs_shadow_copy2.c:1180(shadow_copy2_stat)
  shadow_copy2_stat() failed to get vfs_handle->data!

If I keep the virusfilter module using the QUARANTINE action, keep the
acl_xattr, recycle and full_audit modules and remove the shadow_copy2
module, everything works perfectly again.

If I keep the shadow_copy2, acl_xattr, recycle and full_audit modules and
remove the virusfilter module (QUARANTINE action), everything works
perfectly again.

If I keep all the virusfilter, acl_xattr, recycle, shadow_copy2 and
full_audit modules and change the virusfilter module action to NOTHING,
RENAME or DELETE everything works perfectly again.

As I was unable to solve the problem, nor did I find references on the
internet or in books, I read the source code of the virusfilter and
shadow_copy modules, but, as the log messages were very inconclusive for
me, even using logs at level 10, I just I managed to understand that the
log message comes from line 1180 of shadow_copy2.

I'm using Debian 12.5 with Samba 4.20.1 (backports), but I've already
tested the same settings in other versions of Samba and the problem repeats
itself.

Below are the settings I'm using for Samba.

*## Global parameters#[global]security = ADSserver role = member
servernetbios name = fileservernetbios aliases = fileserverworkgroup =
EXAMPLErealm = EXAMPLE.ADLAN## Recommended Kerberos Setup#dedicated keytab
file = /etc/krb5.keytabkerberos method = secrets and keytab## Logs#log file
= /var/log/samba/%h.logmax log size = 2048log level = 2## To BUILTIN groups
and users#idmap config *:backend = tdbidmap config *:range = 3000-7999  ##
To other domain groups and users#idmap config EXAMPLE:backend = rididmap
config EXAMPLE:range = 1000000-1999999idmap config EXAMPLE:base_rid =
0idmap config EXAMPLE:unix_primary_group = yesidmap config
EXAMPLE:unix_nss_info = no## Automatic kerberos ticket renovation#winbind
refresh tickets = yes## Remove domain prefix#winbind use default domain =
yes## Define shell#template shell = /bin/bashtemplate homedir =
/home/%D/%U## Disabling printer share#load printers = noprinting =
bsdprintcap name = /dev/nulldisable spoolss = yes## Load Samba modules#vfs
objects = virusfilter acl_xattr recycle shadow_copy2 full_audit## acl_xattr
module settings#map acl inherit = yes## Take care#sync always = yesstrict
sync = yes## File Enumeration#access based share enum = yeshide unreadable
= yeshide dot files = yeshide special files = yeshide files =
/*.ntx/*.tmp/*.log/## Take care#veto files =
/*.exe/*.run/*.bin/*.msi/*.php/*.asp/*.aspx/*.js/*.java/*.c/*.cpp/*.sh/*.bat/*.dll/*.{*}/delete
veto files = no## recycle module settings#recycle:keeptree =
yesrecycle:versions = yesrecycle:repository =
/srv/data/shares/lixeira/%Urecycle:directory_mode = 0770recycle:exclude =
*.dll, *.tmp, *.log, *.bak, *.obj, *.old, ~*.*, *.~*recycle:exclude_dir =
cache, temp, tmp, TEMP, TMP## virusfilter module settings - Action NOTHING
- WORKS PERFECTLY##virusfilter:scanner = clamav#virusfilter:socket path =
/run/clamav/clamd.ctl##virusfilter:socket path =
/run/clamd.scan/clamd.sock#virusfilter:scan on open = yes#virusfilter:scan
on close = yes#virusfilter:max file size = 100000000#virusfilter:min file
size = 1#virusfilter:infected file action = nothing#virusfilter:infected
file command = /usr/sbin/createWarningFile.sh %U NOTHING #virusfilter:scan
error command = /usr/bin/python3 /usr/sbin/alert.pyc ERROR %h## virusfilter
module settings - Action QUARANTINE - CONFLICT WITH SHADOW_COPY2
MODULE#virusfilter:scanner = clamavvirusfilter:socket path =
/run/clamav/clamd.ctl#virusfilter:socket path =
/run/clamd.scan/clamd.sockvirusfilter:scan on open = yesvirusfilter:scan on
close = yesvirusfilter:max file size = 100000000virusfilter:min file size =
1virusfilter:infected file action = quarantinevirusfilter:quarantine
directory = /srv/data/shares/quarantine/virusfilter:quarantine prefix =
virusfilter:quarantine suffix = virusfilter:quarantine keep tree =
novirusfilter:quarantine keep name = yesvirusfilter:infected file errno on
open = EACCESvirusfilter:infected file errno on close =
EACCESvirusfilter:infected file command = /usr/sbin/createWarningFile.sh %U
QUARANTINEvirusfilter:scan error command = /usr/bin/python3
/usr/sbin/alert.pyc ERROR %h## virusfilter module settings - Action RENAME
- WORKS PERFECTLY##virusfilter:scanner = clamav#virusfilter:socket path =
/run/clamav/clamd.ctl#virusfilter:scan on open = yes#virusfilter:scan on
close = yes#virusfilter:max file size = 100000000#virusfilter:min file size
= 1#virusfilter:infected file action = rename#virusfilter:infected file
command = /usr/sbin/createWarningFile.sh %U RENAME #virusfilter:scan error
command = /usr/bin/python3 /usr/sbin/alert.pyc ERROR %h## virusfilter
module settings - Action DELETE - WORKS PERFECTLY##virusfilter:scanner =
clamav#virusfilter:socket path = /run/clamav/clamd.ctl#virusfilter:scan on
open = yes#virusfilter:scan on close = yes#virusfilter:max file size =
100000000#virusfilter:min file size = 1#virusfilter:infected file action =
delete#virusfilter:infected file errno on open =
EACCES#virusfilter:infected file errno on close =
EACCES#virusfilter:infected file command = /usr/sbin/createWarningFile.sh
%U DELETE#virusfilter:scan error command = /usr/bin/python3
/usr/sbin/alert.pyc ERROR %h## shadow_copy2 module settings#shadow:basedir
= /srv/data/sharesshadow:snapdir = .zfs/snapshotshadow:sort =
descshadow:format = UTC-3-%Y.%m.%d-%H.%M.%Sshadow:localtime = yes##
full_audit module settings#full_audit:prefix = %U|%I|%Sfull_audit:success =
fchmod fchown lchown mkdirat open read renameat writefull_audit:failure =
all !openfull_audit:facility = LOCAL7full_audit:priority =
ALERT[public_share]   path = /srv/data/shares/public_share   read only =
no   acl_xattr:ignore system acl = yes[trash]   path =
/srv/data/shares/trash/%U   read only = no   browseable = no   root preexec
= /usr/sbin/create_user_dir.sh /srv/data/shares/trash %U   vfs objects =
virusfilter acl_xattr full_audit[quarantine]   path =
/srv/data/shares/quarantine   read only = no   vfs objects = acl_xattr
full_audit*

I appreciate the help. Thanks.