Environment
- Server Ubuntu 16.* (x64)
- smbd version 4.7.1
- SMB Client, Explorer @ Windows 10
Use-case
Browse shared folder ( simple )
Problem at hand
A while after successfully browsing the folder the SMB client logs off and the SMB server exit(0) w/ errno = 104 ( connection reset )
Why does the SMB client LOGOFF ??? Is this the expected behavior? Is there any client side session timeout? and, if so, why does SMBD shuts down?
Diagnostic info bellow:
- smbd log
- smb.conf
- Microsoft Network Monitor dump
smbd log:
smbd version 4.7.1 started.
Copyright Andrew Tridgell and the Samba Team 1992-2017
Registered MSG_REQ_POOL_USAGE
Registered MSG_REQ_DMALLOC_MARK and LOG_CHANGED
lp_load_ex: refreshing parameters
Initialising global parameters
rlimit_max: increasing rlimit_max (1024) to minimum Windows limit (16384)
Processing section "[global]"
Processing section "[AWSVFS]"
adding IPC service
added interface docker0 ip=172.17.0.1 bcast=172.17.255.255 netmask=255.255.0.0
added interface eth0 ip=192.168.10.94 bcast=192.168.10.255 netmask=255.255.255.0
loaded services
INFO: Profiling support unavailable in this build.
Stopped due to shared library event (no libraries added or removed)
Stopped due to shared library event:
Inferior loaded /lib/x86_64-linux-gnu/libnss_compat.so.2
Loaded '/lib/x86_64-linux-gnu/libnss_compat.so.2'. Symbols loaded.
Stopped due to shared library event (no libraries added or removed)
Stopped due to shared library event:
Inferior loaded /lib/x86_64-linux-gnu/libnss_nis.so.2
/lib/x86_64-linux-gnu/libnss_files.so.2
Loaded '/lib/x86_64-linux-gnu/libnss_nis.so.2'. Symbols loaded.
Loaded '/lib/x86_64-linux-gnu/libnss_files.so.2'. Symbols loaded.
Failed to fetch domain sid for WORKGROUP
Failed to fetch domain sid for WORKGROUP
Initialise the svcctl registry keys if needed.
Initialise the eventlog registry keys if needed.
reloading printcap cache
reload status: ok
reloading printcap cache
reload status: ok
waiting for connections
Allowed connection from 192.168.10.71 (192.168.10.71)
init_oplocks: initializing messages.
Transaction 0 of length 159 (0 toread)
switch message SMBnegprot (pid 26793) conn 0x0
Stopped due to shared library event (no libraries added or removed)
Stopped due to shared library event:
Inferior loaded /usr/lib/x86_64-linux-gnu/gconv/IBM850.so
Loaded '/usr/lib/x86_64-linux-gnu/gconv/IBM850.so'. Symbols loaded.
Stopped due to shared library event (no libraries added or removed)
Stopped due to shared library event:
Inferior loaded /usr/lib/x86_64-linux-gnu/gconv/UTF-16.so
Loaded '/usr/lib/x86_64-linux-gnu/gconv/UTF-16.so'. Symbols loaded.
Requested protocol [PC NETWORK PROGRAM 1.0]
Requested protocol [LANMAN1.0]
Requested protocol [Windows for Workgroups 3.1a]
Requested protocol [LM1.2X002]
Requested protocol [LANMAN2.1]
Requested protocol [NT LM 0.12]
Requested protocol [SMB 2.002]
Requested protocol [SMB 2.???]
Selected protocol SMB2_FF
Stopped due to shared library event (no libraries added or removed)
Stopped due to shared library event:
Inferior loaded /usr/local/samba/lib/gensec/krb5.so
Loaded '/usr/local/samba/lib/gensec/krb5.so'. Symbols loaded.
GENSEC backend 'gssapi_spnego' registered
GENSEC backend 'gssapi_krb5' registered
GENSEC backend 'gssapi_krb5_sasl' registered
GENSEC backend 'spnego' registered
GENSEC backend 'schannel' registered
GENSEC backend 'naclrpc_as_system' registered
GENSEC backend 'sasl-EXTERNAL' registered
GENSEC backend 'ntlmssp' registered
GENSEC backend 'ntlmssp_resume_ccache' registered
GENSEC backend 'http_basic' registered
GENSEC backend 'http_ntlm' registered
GENSEC backend 'krb5' registered
GENSEC backend 'fake_gssapi_krb5' registered
Selected protocol SMB 2.???
Selected protocol SMB3_11
Got NTLMSSP neg_flags=0xe2088297
Got user=[noone] domain=[NRUBIN0470-CPC] workstation=[NRUBIN0470-CPC] len1=24 len2=260
lp_load_ex: refreshing parameters
Initialising global parameters
Processing section "[global]"
Processing section "[AWSVFS]"
adding IPC service
check_ntlm_password: Checking password for unmapped user [NRUBIN0470-CPC]\[noone]@[NRUBIN0470-CPC] with the new password interface
check_ntlm_password: mapped user is: [NRUBIN0470-CPC]\[noone]@[NRUBIN0470-CPC]
check_sam_security: Couldn't find user 'noone' in passdb.
check_ntlm_password: Authentication for user [noone] -> [noone] FAILED with error NT_STATUS_NO_SUCH_USER, authoritative=1
Auth: [SMB2,(null)] user [NRUBIN0470-CPC]\[noone] at [ב', 22 ×™× ×• 2018 08:10:03.076238 GMT] with [NTLMv2] status [NT_STATUS_NO_SUCH_USER] workstation [NRUBIN0470-CPC] remote host [ipv4:192.168.10.71:52554] mapped to [NRUBIN0470-CPC]\[noone]. local host [ipv4:192.168.10.94:445]
log_no_json: JSON auth logs not available unless compiled with jansson
No such user noone [NRUBIN0470-CPC] - using guest account
Allowed connection from 192.168.10.71 (192.168.10.71)
Connect path is '/tmp' for service [IPC$]
Initialising default vfs hooks
Initialising custom vfs hooks from [/[Default VFS]/]
nrubin0470-cpc (ipv4:192.168.10.71:52554) connect to service IPC$ initially as user nobody (uid=65534, gid=65534) (pid 26793)
api_pipe_bind_req: wkssvc -> wkssvc rpc service
check_bind_req for wkssvc context_id=0
check_bind_req: wkssvc -> wkssvc rpc service
api_rpcTNP: rpc command: WKSSVC_NETWKSTAGETINFO
api_pipe_bind_req: srvsvc -> srvsvc rpc service
check_bind_req for srvsvc context_id=0
check_bind_req: srvsvc -> srvsvc rpc service
api_rpcTNP: rpc command: SRVSVC_NETSRVGETINFO
api_pipe_bind_req: wkssvc -> wkssvc rpc service
check_bind_req for wkssvc context_id=0
check_bind_req: wkssvc -> wkssvc rpc service
api_rpcTNP: rpc command: WKSSVC_NETWKSTAGETINFO
api_pipe_bind_req: srvsvc -> srvsvc rpc service
check_bind_req for srvsvc context_id=0
check_bind_req: srvsvc -> srvsvc rpc service
api_rpcTNP: rpc command: SRVSVC_NETSRVGETINFO
api_pipe_bind_req: srvsvc -> srvsvc rpc service
check_bind_req for srvsvc context_id=0
check_bind_req: srvsvc -> srvsvc rpc service
api_rpcTNP: rpc command: SRVSVC_NETSHAREENUMALL
nrubin0470-cpc (ipv4:192.168.10.71:52554) closed connection to service IPC$
smb.conf:
[global]
map to guest = Bad User
guest account = nobody
guest only = yes
log file = /var/log/samba/%m
log level = 3
[AWSVFS]
comment = AWS VFS module
path = /home/noone/share
guest ok = yes
read only = no
Microsoft Network Monitor dump
3.8737777 192.168.10.94 192.168.10.71 WKST WKST:NetrWkstaGetInfo Response, ReturnValue=0 {MSRPC:21, SMB2:20, SMBOverTCP:16, TCP:15, IPv4:35}
3.8738624 192.168.10.71 192.168.10.94 SMB2 SMB2:C CLOSE (0x6), FID=0xA3ABB877(wkssvc@#669) {SMB2:20, SMBOverTCP:16, TCP:15, IPv4:35}
3.8740914 192.168.10.94 192.168.10.71 SMB2 SMB2:R CLOSE (0x6), File=wkssvc@#669 {SMB2:20, SMBOverTCP:16, TCP:15, IPv4:35}
3.8743103 192.168.10.71 192.168.10.94 SMB2 SMB2:C CREATE (0x5), Sh(RWD), File=srvsvc@#685 {SMB2:22, SMBOverTCP:16, TCP:15, IPv4:35}
3.8746416 192.168.10.94 192.168.10.71 SMB2 SMB2:R CREATE (0x5), FID=0xAF9A7796(srvsvc@#685) {SMB2:22, SMBOverTCP:16, TCP:15, IPv4:35}
3.8747049 192.168.10.71 192.168.10.94 SMB2 SMB2:C QUERY INFORMATION (0x10), Class=FileStandardInformation (5), FID=0xAF9A7796(srvsvc@#685) {SMB2:22, SMBOverTCP:16, TCP:15, IPv4:35}
3.8749316 192.168.10.94 192.168.10.71 SMB2 SMB2:R QUERY INFORMATION (0x10), File=srvsvc@#685 {SMB2:22, SMBOverTCP:16, TCP:15, IPv4:35}
3.8750026 192.168.10.71 192.168.10.94 MSRPC MSRPC:c/o Bind: srvs(SRVS) UUID{4B324FC8-1670-01D3-1278-5A47BF6EE188} Call=0x2 Assoc Grp=0x0 Xmit=0x10B8 Recv=0x10B8 {MSRPC:23, SMB2:22, SMBOverTCP:16, TCP:15, IPv4:35}
3.8752435 192.168.10.94 192.168.10.71 SMB2 SMB2:R WRITE (0x9), File=srvsvc@#685 {SMB2:22, SMBOverTCP:16, TCP:15, IPv4:35}
3.8752999 192.168.10.71 192.168.10.94 SMB2 SMB2:C READ (0x8), FID=0xAF9A7796 (srvsvc@#685) , 0x400 bytes from offset 0 (0x0) {SMB2:22, SMBOverTCP:16, TCP:15, IPv4:35}
3.8756303 192.168.10.94 192.168.10.71 MSRPC MSRPC:c/o Bind Ack: Call=0x2 Assoc Grp=0x53F0 Xmit=0x10B8 Recv=0x10B8 {MSRPC:23, SMB2:22, SMBOverTCP:16, TCP:15, IPv4:35}
3.8756988 192.168.10.71 192.168.10.94 SRVS SRVS:NetrServerGetInfo Request, ServerName=\\192.168.10.94 Level=101 {MSRPC:23, SMB2:22, SMBOverTCP:16, TCP:15, IPv4:35}
3.8760791 192.168.10.94 192.168.10.71 SRVS SRVS:NetrServerGetInfo Response, Status=ERROR_SUCCESS {MSRPC:23, SMB2:22, SMBOverTCP:16, TCP:15, IPv4:35}
3.8761586 192.168.10.71 192.168.10.94 SMB2 SMB2:C CLOSE (0x6), FID=0xAF9A7796(srvsvc@#685) {SMB2:22, SMBOverTCP:16, TCP:15, IPv4:35}
3.8764261 192.168.10.94 192.168.10.71 SMB2 SMB2:R CLOSE (0x6), File=srvsvc@#685 {SMB2:22, SMBOverTCP:16, TCP:15, IPv4:35}
3.9533802 192.168.10.71 192.168.10.94 SMB2 SMB2:C CREATE (0x5), Sh(RWD), File=srvsvc@#701 {SMB2:24, SMBOverTCP:16, TCP:15, IPv4:35}
3.9537679 192.168.10.94 192.168.10.71 SMB2 SMB2:R CREATE (0x5), FID=0x4FB4666E(srvsvc@#701) {SMB2:24, SMBOverTCP:16, TCP:15, IPv4:35}
3.9538780 192.168.10.71 192.168.10.94 SMB2 SMB2:C QUERY INFORMATION (0x10), Class=FileStandardInformation (5), FID=0x4FB4666E(srvsvc@#701) {SMB2:24, SMBOverTCP:16, TCP:15, IPv4:35}
3.9541882 192.168.10.94 192.168.10.71 SMB2 SMB2:R QUERY INFORMATION (0x10), File=srvsvc@#701 {SMB2:24, SMBOverTCP:16, TCP:15, IPv4:35}
3.9542911 192.168.10.71 192.168.10.94 MSRPC MSRPC:c/o Bind: srvs(SRVS) UUID{4B324FC8-1670-01D3-1278-5A47BF6EE188} Call=0x2 Assoc Grp=0x0 Xmit=0x10B8 Recv=0x10B8 {MSRPC:25, SMB2:24, SMBOverTCP:16, TCP:15, IPv4:35}
3.9546555 192.168.10.94 192.168.10.71 SMB2 SMB2:R WRITE (0x9), File=srvsvc@#701 {SMB2:24, SMBOverTCP:16, TCP:15, IPv4:35}
3.9547453 192.168.10.71 192.168.10.94 SMB2 SMB2:C READ (0x8), FID=0x4FB4666E (srvsvc@#701) , 0x400 bytes from offset 0 (0x0) {SMB2:24, SMBOverTCP:16, TCP:15, IPv4:35}
3.9551359 192.168.10.94 192.168.10.71 MSRPC MSRPC:c/o Bind Ack: Call=0x2 Assoc Grp=0x53F0 Xmit=0x10B8 Recv=0x10B8 {MSRPC:25, SMB2:24, SMBOverTCP:16, TCP:15, IPv4:35}
3.9552194 192.168.10.71 192.168.10.94 SRVS SRVS:NetrShareEnum Request, ServerName=\\192.168.10.94 PreferedMaximumLength=4294967295 ResumeHandle=NULL {MSRPC:25, SMB2:24, SMBOverTCP:16, TCP:15, IPv4:35}
3.9557021 192.168.10.94 192.168.10.71 SRVS SRVS:NetrShareEnum Response, TotalEntries=3 ResumeHandle=NULL Status=ERROR_SUCCESS {MSRPC:25, SMB2:24, SMBOverTCP:16, TCP:15, IPv4:35}
3.9558167 192.168.10.71 192.168.10.94 SMB2 SMB2:C CLOSE (0x6), FID=0x4FB4666E(srvsvc@#701) {SMB2:24, SMBOverTCP:16, TCP:15, IPv4:35}
3.9561380 192.168.10.94 192.168.10.71 SMB2 SMB2:R CLOSE (0x6), File=srvsvc@#701 {SMB2:24, SMBOverTCP:16, TCP:15, IPv4:35}
14.5760160 192.168.10.71 192.168.10.94 SMB2 SMB2:C TREE DISCONNECT (0x4), TID=0xe5211280 {SMBOverTCP:16, TCP:15, IPv4:35}
14.5765348 192.168.10.94 192.168.10.71 SMB2 SMB2:R TREE DISCONNECT (0x4) {SMBOverTCP:16, TCP:15, IPv4:35}
14.5766266 192.168.10.71 192.168.10.94 SMB2 SMB2:C LOGOFF (0x2) {SMBOverTCP:16, TCP:15, IPv4:35}
14.5771544 192.168.10.94 192.168.10.71 SMB2 SMB2:R LOGOFF (0x2) {SMBOverTCP:16, TCP:15, IPv4:35}