cifs, smb - Can't mount (permission denied) or navigate shared folder

Question

I've recently bumped into this problem. I usually navigate through a local network shared folder from a Linux machine via smb (i.e. from file manger using smb: ). Now whenever I try to access the shortcut or typing credential again I keep getting the dialog window asking for user, domain and password.

So I tried mounting the location manually using cisf-utils doing:

sudo mount -t cifs //fileshare1/docs1/user/My\ Documents/shared/Francesco/ /home/frank/used_shared/ -o username=my_user,password=my_pass,domain=my_domain,gid=1000,uid=1000

I get mount error(13): Permission denied.

I'm definitely sure my user has permission on that folder cause I can access it from a windows machine.

Also if I try to mount my personal folder on that location through:

sudo mount -t cifs //fileshare1/docs5/francesco.azzarello/ /home/frank/mnt_folder -o username=my_user,password=my_pass,domain=my_domain,gid=1000,uid=1000

I can access it with no problem.

For reference I'm using 4.2.0-36-generic kernel and my mount.cifs version is 6.4

Any idea on how to make one of both methods work?

---

Update Rgarding ponsfrilus answer

number 1: verbose option returns:

_mount.cifs kernel mount options: ip=xxx.xxx.xxx.xxx,unc=\\fileshare1\docs1,uid=1000,gid=1000,user=my_user,,domain=my_domain,prefixpath=user/My Documents/shared/Francesco/,pass=********
mount error(13): Permission denied
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)_

Number 2 is basically the same thing:

_ mount.cifs kernel mount options: ip=xxx.xxx.xxx.xxx,unc=\\fileshare1\docs1,iocharset=utf8,file_mode=0777,dir_mode=0777,user=my_user,,domain=my_domain,prefixpath=user/My Documents/shared/Francesco/,pass=********
mount error(13): Permission denied
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)_

And nothing changed with vers=2.1:

_mount.cifs kernel mount options: ip=xxx.xxx.xxx.xxx,unc=\\fileshare1\docs1,vers=2.1,iocharset=utf8,file_mode=0777,dir_mode=0777,user=my_user,,domain=my_domain,prefixpath=user/My Documents/shared/Francesco/,pass=********
mount error(13): Permission denied
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)_

As for number 4 I can mount docs1 no problem but I can navigate tho get to the shared folder in user.

Solution 1

I'm pretty sure I ran into this exact same problem today on Ubuntu 16.10 I tried all the suggestions in this thread several times, I could mount the exact same share using Windows Server 2016 and I could browse it using smbclient (smbclient -U brainstrust //WINBOX01/shared). I even tried an external credentials file.

I ended up stumbling on a fix - although I'd created a local user for the share on the Windows box, it was also joined to a domain. Basically setting the domain to be the local machine -o domain=WINBOX01 fixed my problem instantly, so leaving a comment here in the hope that its useful to someone out there.

The complete minimal command I used was:

sudo mount.cifs -v //WINBOX01/shared /home/geoff/winbox01  --verbose -o user=brainstrust,password=topsecret,domain=WINBOX01

Solution 2

I think you have the wrong security type for the server , error 13 means the server isn't letting you in.

You will need to select the right security mode in your mount command add a sec option via -o as follows [reference]:

sec=
   Security mode. Allowed values are:
   ·   none - attempt to connection as a null user (no name)
   ·   krb5 - Use Kerberos version 5 authentication
   ·   krb5i - Use Kerberos authentication and forcibly enable packet 
       signing
   ·   ntlm - Use NTLM password hashing
   ·   ntlmi - Use NTLM password hashing and force packet signing
   ·   ntlmv2 - Use NTLMv2 password hashing
   ·   ntlmv2i - Use NTLMv2 password hashing and force packet signing
   ·   ntlmssp - Use NTLMv2 password hashing encapsulated in Raw NTLMSSP message
   ·   ntlmsspi - Use NTLMv2 password hashing encapsulated in Raw NTLMSSP message, and force packet signing

Solution 3

1. Try to add the "-v" option to get verbose output:

   sudo mount -v -t cifs //fileshare1/docs1/user/My\ 
      Documents/shared/Francesco/ /home/frank/mnt_folder -o \
      username=my_user,password=my_pass,domain=my_domain,gid=1000,uid=1000
   

2. Test with these options to the mount command

   iocharset=utf8,rw,file_mode=0777,dir_mode=0777:

   sudo mount -v -t cifs //fileshare1/docs1/user/My\ 
      Documents/shared/Francesco/ /home/frank/mnt_folder -o 
      username=my_user,password=my_pass,domain=my_domain,\
      iocharset=utf8,rw,file_mode=0777,dir_mode=0777
   

3. Test specifying the SMB version option (vers=2.1), see the samba wiki. From the mount.cifs man page:

   vers=
   SMB protocol version. Allowed values are:

   • 1.0 - The classic CIFS/SMBv1 protocol. This is the default.

   • 2.0 - The SMBv2.002 protocol. This was initially introduced in Windows Vista Service Pack 1, and Windows Server 2008. Note that the initial release version of Windows Vista spoke a slightly different dialect (2.000) that is not supported.

   • 2.1 - The SMBv2.1 protocol that was introduced in Microsoft Windows 7 and Windows Server 2008R2.

   • 3.0 - The SMBv3.0 protocol that was introduced in Microsoft Windows 8 and Windows Server 2012.

4. Finally, try to mount only the first share :

   sudo mount -v -t cifs //fileshare1/docs1/ /home/frank/mnt_folder \
      -o username=my_user,password=my_pass,domain=my_domain,\
      iocharset=utf8,rw,file_mode=0777,dir_mode=0777
   

Any verbose output you can share might help.

Solution 4

For this problem when using cifs higher than 6.0: new version of cifs use the domain variable instead, so creadentials file look like:

username=<your username>
password=<your password>
domain=<your domain>

Solution 5

Adding the option sec=ntlm to the mount command resolved my issue.

eg:

sudo mount -t cifs -o username=administrator,password=123456,sec=ntlm //ip/eeshare /mnt/eeshare/

View more solutions

Comments

[emk2203]

Try ponsfrilus' tip #3 with vers=3.0, maybe also vers=2.0 or vers=1.0. If this doesn't work, maybe you can allow the server a broader range of smb versions to connect. I had this issue myself because smb3 was set on the server as required. I couldn't connect with linux until the server lowered the required samba version to 2. What OS does the server run?

[Frankmtl]

I tried all of them. I still get "permission denied" with 3.0, 2.1 and 2.0. While I get "unknown error" with 1.0. I don't know how to check the windows server version as user since I don't have direct access to it.

[emk2203]

Can't help you on that, sorry. I had control over the server and my problem went away after relaxing the allowed SMB versions. You can connect to your own share - linux misconfiguration unlikely; you can connect via windows to share - server misconfiguration unlikely. This calls for a real samba guru.

[Frankmtl]

Thank you for you answer. I Didn't find any better way to replay other than update the question. you can find the outputs of those commands in the update

[Frankmtl]

I tried all of them and I receive "permission denied" or "unknown error" depending on the sec type

[ponsfrilus]

@Frankmtl can you compare the folders rights inside docs1 and docs5 fileshare1 ?

[Frankmtl]

Sorry for the late reply. If you mean the folder permissions after i mount them, they both have drwxr-xr-x

[Amias]

given all the recent security issues with SMB I would advice only using it where a lot of additional security measures are in place , such as very up to date virus checking.

[laugeo]

To access a Windows 2012 server share (smb2), you must add ,vers=2.1 after uid=1000 (aka end of line) . I installed also "cifs-utils" package.

[dleerob]

Thanks for leaving this comment here, it helped me out.

[Terminality]

Helped me too. Appears that mount -t cifs suffers from the same problem

[Charlie]

This is what turned out to be my problem. I already had a ~/.smbcredentials file. I'm horrified to find out my local NAS has let me mount the share with a bad password for a very long time.

[Humpity]

Try using sec=ntlmssp, and make sure your samba server config encrypts the password.

[bviktor]

Oddly enough, we needed to specify the domain NetBIOS name, not the fileserver's hostname. Nevertheless, it does work now, thanks a lot.

[chuckedw]

Saved my day. Actually what I did was just remove the sec=ntlm and then it worked.

[Amias]

You really should move away from SMB these days, it's a near constant source of attacks and privelege escalation.

[W.M.]

The solution for me was indeed no spaces before and after =.

[Elysiumplain]

Note that exclusion of the sec parameter is not the same as some default none or ntlm value.

[Kentgrav]

Thanks mate. Solved my problem. Was missing domain=.

[Admin]

adding sec=ntlm was the final step to get a centos 7 linux box to connect to an old rohde and schwarz SMU200A generator stil running windows xp. Another centos 7 box did not need this flag. weird.