thr3ads.net - dovecot - Need to authenticate Outlook and NTLM [Feb 2019]

If this information is useful, please help other people find it:
Share via:

Mark Foley

2019-Feb-08 05:19 UTC

Need to authenticate Outlook and NTLM

I've posted questions on this before, but now I really, really need a
solution.

Using Dovecot 2.2.33.2

We've been using Dovecot as IMAP server for several years on a Linux host
which is also the
Active Directory / Domain Controller.  We have both Thunderbird and Outlook
clients.  The
Thunderbird clients authenticate w/o problem with AD credentials using
Kerberos/GSSAPI.

I've never been able to get the Outlook clients to authenticate using domain
credentials, so
I've also hard-coded user and password into /etc/passwd and let the Dovecot
authenticate via
PLAIN LOGIN.  Now, however, I am mandated to switch all users to Outlook, so I
need an AD
credential solution. 

I found https://wiki2.dovecot.org/HowTo/ActiveDirectoryNtlm and followed those
instructions.
The first problem I ran into was in Step 3 where it said to put the following
line in the
config: 

auth_ntlm_use_winbind = yes

This gave me an error when I restarted Dovecot:

Restarting Dovecotdoveconf: Fatal: Error in configuration file
/usr/local/etc/dovecot/conf.d/10-auth.conf line 84: Unknown setting:
auth_ntlm_use_winbind

googling this error indicated that this was a version 1.x directive and 2.x used
only
auth_use_winbind.  I removed the auth_ntlm_use_winbind and Dovecot restart.  If
this is true,
the wiki should be updated since it purports to be a version 2.x wiki.  I
followed the rest of
the instructions on that wiki and my modified config is:

$ doveconf -n
# 2.2.33.2 (d6601f4ec): /usr/local/etc/dovecot/dovecot.conf
# OS: Linux 4.4.157 x86_64 Slackware 14.2 
auth_debug = yes
auth_debug_passwords = yes
auth_gssapi_hostname = $ALL
auth_krb5_keytab = /etc/dovecot/dovecot.keytab
auth_mechanisms = plain login gssapi ntlm
auth_use_winbind = yes
auth_username_format = %n
auth_verbose = yes
auth_verbose_passwords = plain
disable_plaintext_auth = no
info_log_path = /var/log/dovecot_info
mail_location = maildir:~/Maildir
passdb {
  driver = shadow
}
protocols = imap
ssl_cert =
</etc/ssl/certs/OHPRS/GoDaddy/Apache/2016-08-10/54e789087d419b6e.crt
ssl_key =  # hidden, use -P to show it
userdb {
  driver = passwd
}
verbose_ssl = yes

New additions to my pre-ntlm conf is only the 'ntlm' added the the
auth_mechanism and:

auth_winbind_helper_path = /usr/bin/ntlm_auth

which interestingly doesn't show into the 'doveconf -n' output,
above. Is it a default?

I then attempted to connect from Outlook and got the error:

auth: Info: ntlm(?,192.168.0.58,<qd9nulmB4sLAqAA6>): ntlm_auth reports
broken helper: NT_STATUS_UNSUCCESSFUL

After more searching I came across this post,
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=774263
which, in summary, said that ntlm_auth had to run as root. So, I added the
following to my
dovecot config per that post's suggestion:

service auth {
  user = root
}

After restarting and trying again to connect from Outlook I got the message:

auth: Info: ntlm(?,192.168.0.58,<SCINjFqBKcXAqAA6>): user not
authenticated: NT_STATUS_NO_MEMORY

At this point I've been unable to find a solution to this error. I've
listed the entire dovecot
log output for this last attempt to connect from Outlook below.

Has anyone in the Universe successfully connected from Outlook using active
domain credentials?
If so, what's the secret? What am I not doing correctly?

Thanks for any and all help! --Mark

dovecot log:

Feb 07 23:39:40 auth: Debug: Loading modules from directory:
/usr/local/lib/dovecot/auth
Feb 07 23:39:40 auth: Debug: Module loaded:
/usr/local/lib/dovecot/auth/lib20_auth_var_expand_crypt.so
Feb 07 23:39:40 auth: Debug: Read auth token secret from
/usr/local/var/run/dovecot/auth-token-secret.dat
Feb 07 23:39:40 auth: Debug: auth client connected (pid=16357)
Feb 07 23:39:40 auth: Debug: client in: AUTH    1       NTLM    service=imap   
session=SCINjFqBKcXAqAA6        lip=192.168.0.2 rip=192.168.0.58       lport=143
rport=50473
Feb 07 23:39:40 auth: Debug: client passdb out: CONT    1
Feb 07 23:39:40 auth: Debug: client in: CONT    1      
TlRMTVNTUAABAAAAB4IIogAAAAAAAAAAAAAAAAAAAAAGAbEdAAAADw== (previous base64 data
may contain sensitive data)
Feb 07 23:39:40 auth: Debug: client passdb out: CONT    1      
TlRMTVNTUAACAAAACAAIADgAAAAFgomifTyOI3AwfogAAAAAAAAAAGIAYgBAAAAABgEAAAAAAA9IAFAAUgBTAAIACABIAFAAUgBTAAEACABNAEEASQBMAAQAFABoAHAAcgBzAC4AbABvAGMAYQBsAAMAHgBtAGEAaQBsAC4AaABwAHIAcwAuAGwAbwBjAGEAbAAHAAgAVIrLTWi/1AEAAAAA
Feb 07 23:39:40 auth: Debug: client in: CONT    1      
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
(previous base64 data may contain sensitive data)
Feb 07 23:39:40 auth: Info: ntlm(?,192.168.0.58,<SCINjFqBKcXAqAA6>): user
not authenticated: NT_STATUS_NO_MEMORY
Feb 07 23:39:42 auth: Debug: client passdb out: FAIL    1

Mark Foley

2019-Feb-08 05:51 UTC

head link

Need to authenticate Outlook and NTLM

More on this ...

I short-sheeted ntlm_auth to see what was being passed to it. It is getting as
arg1:

--helper-protocol=squid-2.5-ntlmssp

I tried running ntlm_auth at the command line as:

ntlm_auth --username=user --password=password
--helper-protocol=squid-2.5-ntlmssp

It did nothing, just hung there. The ntlm_auth man page says:

--helper-protocol=PROTO
  Operate as a stdio-based helper. Valid helper protocols are:

  squid-2.5-ntlmssp
    Server-side helper for use with Squid 2.5's NTLMSSP authentication.

    Requires access to the directory winbindd_privileged in $LOCKDIR. The
protocol used is described here:
    http://devel.squid-cache.org/ntlm/squid_helper_protocol.html. This protocol
has been extended to allow the
    NTLMSSP Negotiate packet to be included as an argument to the YR command.
(Thus avoiding loss of information in
    the protocol exchange).

Squid NTLM authentication? As far as I know, I don't have Squid. If I leave
off the
--helper-protocol bit on the ntlm_auth command line, it returns an OK status.

Is there a way to NOT pass "--helper-protocol=squid-2.5-ntlmssp"?
Would this help?

--Mark

-----Original Message-----
Date: Fri, 08 Feb 2019 00:19:19 -0500
Organization: Ohio Highway Patrol Retirement System
To: dovecot at dovecot.org
Subject: Need to authenticate Outlook and NTLM

I've posted questions on this before, but now I really, really need a
solution.

Using Dovecot 2.2.33.2

We've been using Dovecot as IMAP server for several years on a Linux host
which is also the
Active Directory / Domain Controller.  We have both Thunderbird and Outlook
clients.  The
Thunderbird clients authenticate w/o problem with AD credentials using
Kerberos/GSSAPI.

I've never been able to get the Outlook clients to authenticate using domain
credentials, so
I've also hard-coded user and password into /etc/passwd and let the Dovecot
authenticate via
PLAIN LOGIN.  Now, however, I am mandated to switch all users to Outlook, so I
need an AD
credential solution. 

I found https://wiki2.dovecot.org/HowTo/ActiveDirectoryNtlm and followed those
instructions.
The first problem I ran into was in Step 3 where it said to put the following
line in the
config: 

auth_ntlm_use_winbind = yes

This gave me an error when I restarted Dovecot:

Restarting Dovecotdoveconf: Fatal: Error in configuration file
/usr/local/etc/dovecot/conf.d/10-auth.conf line 84: Unknown setting:
auth_ntlm_use_winbind

googling this error indicated that this was a version 1.x directive and 2.x used
only
auth_use_winbind.  I removed the auth_ntlm_use_winbind and Dovecot restart.  If
this is true,
the wiki should be updated since it purports to be a version 2.x wiki.  I
followed the rest of
the instructions on that wiki and my modified config is:

$ doveconf -n
# 2.2.33.2 (d6601f4ec): /usr/local/etc/dovecot/dovecot.conf
# OS: Linux 4.4.157 x86_64 Slackware 14.2 
auth_debug = yes
auth_debug_passwords = yes
auth_gssapi_hostname = $ALL
auth_krb5_keytab = /etc/dovecot/dovecot.keytab
auth_mechanisms = plain login gssapi ntlm
auth_use_winbind = yes
auth_username_format = %n
auth_verbose = yes
auth_verbose_passwords = plain
disable_plaintext_auth = no
info_log_path = /var/log/dovecot_info
mail_location = maildir:~/Maildir
passdb {
  driver = shadow
}
protocols = imap
ssl_cert =
</etc/ssl/certs/OHPRS/GoDaddy/Apache/2016-08-10/54e789087d419b6e.crt
ssl_key =  # hidden, use -P to show it
userdb {
  driver = passwd
}
verbose_ssl = yes

New additions to my pre-ntlm conf is only the 'ntlm' added the the
auth_mechanism and:

auth_winbind_helper_path = /usr/bin/ntlm_auth

which interestingly doesn't show into the 'doveconf -n' output,
above. Is it a default?

I then attempted to connect from Outlook and got the error:

auth: Info: ntlm(?,192.168.0.58,<qd9nulmB4sLAqAA6>): ntlm_auth reports
broken helper: NT_STATUS_UNSUCCESSFUL

After more searching I came across this post,
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=774263
which, in summary, said that ntlm_auth had to run as root. So, I added the
following to my
dovecot config per that post's suggestion:

service auth {
  user = root
}

After restarting and trying again to connect from Outlook I got the message:

auth: Info: ntlm(?,192.168.0.58,<SCINjFqBKcXAqAA6>): user not
authenticated: NT_STATUS_NO_MEMORY

At this point I've been unable to find a solution to this error. I've
listed the entire dovecot
log output for this last attempt to connect from Outlook below.

Has anyone in the Universe successfully connected from Outlook using active
domain credentials?
If so, what's the secret? What am I not doing correctly?

Thanks for any and all help! --Mark

dovecot log:

Feb 07 23:39:40 auth: Debug: Loading modules from directory:
/usr/local/lib/dovecot/auth
Feb 07 23:39:40 auth: Debug: Module loaded:
/usr/local/lib/dovecot/auth/lib20_auth_var_expand_crypt.so
Feb 07 23:39:40 auth: Debug: Read auth token secret from
/usr/local/var/run/dovecot/auth-token-secret.dat
Feb 07 23:39:40 auth: Debug: auth client connected (pid=16357)
Feb 07 23:39:40 auth: Debug: client in: AUTH    1       NTLM    service=imap   
session=SCINjFqBKcXAqAA6        lip=192.168.0.2 rip=192.168.0.58       lport=143
rport=50473
Feb 07 23:39:40 auth: Debug: client passdb out: CONT    1
Feb 07 23:39:40 auth: Debug: client in: CONT    1      
TlRMTVNTUAABAAAAB4IIogAAAAAAAAAAAAAAAAAAAAAGAbEdAAAADw== (previous base64 data
may contain sensitive data)
Feb 07 23:39:40 auth: Debug: client passdb out: CONT    1      
TlRMTVNTUAACAAAACAAIADgAAAAFgomifTyOI3AwfogAAAAAAAAAAGIAYgBAAAAABgEAAAAAAA9IAFAAUgBTAAIACABIAFAAUgBTAAEACABNAEEASQBMAAQAFABoAHAAcgBzAC4AbABvAGMAYQBsAAMAHgBtAGEAaQBsAC4AaABwAHIAcwAuAGwAbwBjAGEAbAAHAAgAVIrLTWi/1AEAAAAA
Feb 07 23:39:40 auth: Debug: client in: CONT    1      
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
(previous base64 data may contain sensitive data)
Feb 07 23:39:40 auth: Info: ntlm(?,192.168.0.58,<SCINjFqBKcXAqAA6>): user
not authenticated: NT_STATUS_NO_MEMORY
Feb 07 23:39:42 auth: Debug: client passdb out: FAIL    1

Mark Foley

2019-Feb-13 19:41 UTC

head link

Need to authenticate Outlook and NTLM

Is it possible that no one on this list is authenticating Outlook with Dovecot
and NTLM?

--Mark

-----Original Message-----
Date: Fri, 08 Feb 2019 00:51:01 -0500
To: dovecot at dovecot.org
Subject: Re: Need to authenticate Outlook and NTLM
From: Mark Foley via dovecot <dovecot at dovecot.org>

More on this ...

I short-sheeted ntlm_auth to see what was being passed to it. It is getting as
arg1:

--helper-protocol=squid-2.5-ntlmssp

I tried running ntlm_auth at the command line as:

ntlm_auth --username=user --password=password
--helper-protocol=squid-2.5-ntlmssp

It did nothing, just hung there. The ntlm_auth man page says:

--helper-protocol=PROTO
  Operate as a stdio-based helper. Valid helper protocols are:

  squid-2.5-ntlmssp
    Server-side helper for use with Squid 2.5's NTLMSSP authentication.

    Requires access to the directory winbindd_privileged in $LOCKDIR. The
protocol used is described here:
    http://devel.squid-cache.org/ntlm/squid_helper_protocol.html. This protocol
has been extended to allow the
    NTLMSSP Negotiate packet to be included as an argument to the YR command.
(Thus avoiding loss of information in
    the protocol exchange).

Squid NTLM authentication? As far as I know, I don't have Squid. If I leave
off the
--helper-protocol bit on the ntlm_auth command line, it returns an OK status.

Is there a way to NOT pass "--helper-protocol=squid-2.5-ntlmssp"?
Would this help?

--Mark

-----Original Message-----
Date: Fri, 08 Feb 2019 00:19:19 -0500
Organization: Ohio Highway Patrol Retirement System
To: dovecot at dovecot.org
Subject: Need to authenticate Outlook and NTLM

I've posted questions on this before, but now I really, really need a
solution.

Using Dovecot 2.2.33.2

We've been using Dovecot as IMAP server for several years on a Linux host
which is also the
Active Directory / Domain Controller.  We have both Thunderbird and Outlook
clients.  The
Thunderbird clients authenticate w/o problem with AD credentials using
Kerberos/GSSAPI.

I've never been able to get the Outlook clients to authenticate using domain
credentials, so
I've also hard-coded user and password into /etc/passwd and let the Dovecot
authenticate via
PLAIN LOGIN.  Now, however, I am mandated to switch all users to Outlook, so I
need an AD
credential solution. 

I found https://wiki2.dovecot.org/HowTo/ActiveDirectoryNtlm and followed those
instructions.
The first problem I ran into was in Step 3 where it said to put the following
line in the
config: 

auth_ntlm_use_winbind = yes

This gave me an error when I restarted Dovecot:

Restarting Dovecotdoveconf: Fatal: Error in configuration file
/usr/local/etc/dovecot/conf.d/10-auth.conf line 84: Unknown setting:
auth_ntlm_use_winbind

googling this error indicated that this was a version 1.x directive and 2.x used
only
auth_use_winbind.  I removed the auth_ntlm_use_winbind and Dovecot restart.  If
this is true,
the wiki should be updated since it purports to be a version 2.x wiki.  I
followed the rest of
the instructions on that wiki and my modified config is:

$ doveconf -n
# 2.2.33.2 (d6601f4ec): /usr/local/etc/dovecot/dovecot.conf
# OS: Linux 4.4.157 x86_64 Slackware 14.2 
auth_debug = yes
auth_debug_passwords = yes
auth_gssapi_hostname = $ALL
auth_krb5_keytab = /etc/dovecot/dovecot.keytab
auth_mechanisms = plain login gssapi ntlm
auth_use_winbind = yes
auth_username_format = %n
auth_verbose = yes
auth_verbose_passwords = plain
disable_plaintext_auth = no
info_log_path = /var/log/dovecot_info
mail_location = maildir:~/Maildir
passdb {
  driver = shadow
}
protocols = imap
ssl_cert =
</etc/ssl/certs/OHPRS/GoDaddy/Apache/2016-08-10/54e789087d419b6e.crt
ssl_key =  # hidden, use -P to show it
userdb {
  driver = passwd
}
verbose_ssl = yes

New additions to my pre-ntlm conf is only the 'ntlm' added the the
auth_mechanism and:

auth_winbind_helper_path = /usr/bin/ntlm_auth

which interestingly doesn't show into the 'doveconf -n' output,
above. Is it a default?

I then attempted to connect from Outlook and got the error:

auth: Info: ntlm(?,192.168.0.58,<qd9nulmB4sLAqAA6>): ntlm_auth reports
broken helper: NT_STATUS_UNSUCCESSFUL

After more searching I came across this post,
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=774263
which, in summary, said that ntlm_auth had to run as root. So, I added the
following to my
dovecot config per that post's suggestion:

service auth {
  user = root
}

After restarting and trying again to connect from Outlook I got the message:

auth: Info: ntlm(?,192.168.0.58,<SCINjFqBKcXAqAA6>): user not
authenticated: NT_STATUS_NO_MEMORY

At this point I've been unable to find a solution to this error. I've
listed the entire dovecot
log output for this last attempt to connect from Outlook below.

Has anyone in the Universe successfully connected from Outlook using active
domain credentials?
If so, what's the secret? What am I not doing correctly?

Thanks for any and all help! --Mark

dovecot log:

Feb 07 23:39:40 auth: Debug: Loading modules from directory:
/usr/local/lib/dovecot/auth
Feb 07 23:39:40 auth: Debug: Module loaded:
/usr/local/lib/dovecot/auth/lib20_auth_var_expand_crypt.so
Feb 07 23:39:40 auth: Debug: Read auth token secret from
/usr/local/var/run/dovecot/auth-token-secret.dat
Feb 07 23:39:40 auth: Debug: auth client connected (pid=16357)
Feb 07 23:39:40 auth: Debug: client in: AUTH    1       NTLM    service=imap   
session=SCINjFqBKcXAqAA6        lip=192.168.0.2 rip=192.168.0.58       lport=143
rport=50473
Feb 07 23:39:40 auth: Debug: client passdb out: CONT    1
Feb 07 23:39:40 auth: Debug: client in: CONT    1      
TlRMTVNTUAABAAAAB4IIogAAAAAAAAAAAAAAAAAAAAAGAbEdAAAADw== (previous base64 data
may contain sensitive data)
Feb 07 23:39:40 auth: Debug: client passdb out: CONT    1      
TlRMTVNTUAACAAAACAAIADgAAAAFgomifTyOI3AwfogAAAAAAAAAAGIAYgBAAAAABgEAAAAAAA9IAFAAUgBTAAIACABIAFAAUgBTAAEACABNAEEASQBMAAQAFABoAHAAcgBzAC4AbABvAGMAYQBsAAMAHgBtAGEAaQBsAC4AaABwAHIAcwAuAGwAbwBjAGEAbAAHAAgAVIrLTWi/1AEAAAAA
Feb 07 23:39:40 auth: Debug: client in: CONT    1      
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
(previous base64 data may contain sensitive data)
Feb 07 23:39:40 auth: Info: ntlm(?,192.168.0.58,<SCINjFqBKcXAqAA6>): user
not authenticated: NT_STATUS_NO_MEMORY
Feb 07 23:39:42 auth: Debug: client passdb out: FAIL    1

Mark Foley

2019-Feb-19 02:48 UTC

head link

Need to authenticate Outlook and NTLM

On Mon, 18 Feb 2019 10:17:16 -0000 Stuart Henderson
wrote:>
> On 2019-02-13, Mark Foley via dovecot <dovecot at dovecot.org> wrote:
> > Is it possible that no one on this list is authenticating Outlook with
Dovecot and NTLM?
>
> Yes, it's possible, the outdated instructions you found on the wiki
> suggests it's an uncommon configiration.
Hmmm, really? And yet Windows/Outlook is still the predominant email client out
there
(unfortunately). Maybe everyone is going to outlook.com?
> No actual answers from me, but it might give you some clues:
>
> > More on this ...
> >
> > I short-sheeted ntlm_auth to see what was being passed to it. It is
getting as arg1:
> >
> > --helper-protocol=squid-2.5-ntlmssp
> >
> > I tried running ntlm_auth at the command line as:
> >
> > ntlm_auth --username=user --password=password
--helper-protocol=squid-2.5-ntlmssp
> >
> > It did nothing, just hung there. The ntlm_auth man page says:
> >
> > --helper-protocol=PROTO
> >   Operate as a stdio-based helper. Valid helper protocols are:
>
> The squid auth helpers are stdio-based, they run in a loop, reading from
> stdin, checking authentication, and return results on stdout. This avoids
both
> passing sensitive data on the command line (visible to ps, at least
briefly)
> and the need to keep forking and initialising a new process.
>
> So it's normal that it would just sit waiting for input.
>
> Dovecot is just reusing the same protocol that squid uses.
If --username and --password are passed on the command line, what is it waiting
for on stdin?
Normally, ntlm_auth, with id and pw passed on the command line prints,
"NT_STATUS_OK: The
operation completed successfully. (0x0)" to stdout. There is no further
stdin input needed.

Is there a way to disable the --helper-protocol in Dovecot? 
>
> > After more searching I came across this post,
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=774263
> > which, in summary, said that ntlm_auth had to run as root. So, I added
the following to my
> > dovecot config per that post's suggestion:
> >
> > service auth {
> >   user = root
> > }
> >
> > After restarting and trying again to connect from Outlook I got the
message:
> >
> > auth: Info: ntlm(?,192.168.0.58,<SCINjFqBKcXAqAA6>): user not
authenticated: NT_STATUS_NO_MEMORY
>
> I don't know the full details of how samba/ntlm works, but this seems
like
> an error coming from the server you're attempting to authenticate
against.
> I think you should start debugging on the samba side - make sure tools
> like wbinfo are working, if not then debug those with samba, then move
> on to Dovecot after you have that working.
Samba has been running for years (with updates) and everything like wbinfo
works.  Dovecot can
authenticate with kerberos/GSSAPI, and other applications can authenticate with
ntlm_auth.  My
suspicion here is that the "user not authenticated" problem is perhaps
because dovecot cannot
run the auth service as root? The dovecot user is dovenull, so why would it be
permitted to run
as root in any case?

I think the problem is in invoking ntlm_auth. I tried simply returning zero from
my "fake"
ntlm_auth, but that didn't work. Not sure what Dovecot is expecting from
ntlm_auth_helper.

--Mark

Aki Tuomi

2019-Feb-19 06:53 UTC

head link

Need to authenticate Outlook and NTLM

On 19.2.2019 4.48, Mark Foley via dovecot wrote:> On Mon, 18 Feb 2019 10:17:16 -0000 Stuart Henderson wrote:
>> On 2019-02-13, Mark Foley via dovecot <dovecot at dovecot.org>
wrote:
>>> Is it possible that no one on this list is authenticating Outlook
with Dovecot and NTLM?
>> Yes, it's possible, the outdated instructions you found on the wiki
>> suggests it's an uncommon configiration.
> Hmmm, really? And yet Windows/Outlook is still the predominant email client
out there
> (unfortunately). Maybe everyone is going to outlook.com?
>
>> No actual answers from me, but it might give you some clues:
>>
>>> More on this ...
>>>
>>> I short-sheeted ntlm_auth to see what was being passed to it. It is
getting as arg1:
>>>
>>> --helper-protocol=squid-2.5-ntlmssp
>>>
>>> I tried running ntlm_auth at the command line as:
>>>
>>> ntlm_auth --username=user --password=password
--helper-protocol=squid-2.5-ntlmssp
>>>
>>> It did nothing, just hung there. The ntlm_auth man page says:
>>>
>>> --helper-protocol=PROTO
>>>   Operate as a stdio-based helper. Valid helper protocols are:
>> The squid auth helpers are stdio-based, they run in a loop, reading
from
>> stdin, checking authentication, and return results on stdout. This
avoids both
>> passing sensitive data on the command line (visible to ps, at least
briefly)
>> and the need to keep forking and initialising a new process.
>>
>> So it's normal that it would just sit waiting for input.
>>
>> Dovecot is just reusing the same protocol that squid uses.
> If --username and --password are passed on the command line, what is it
waiting for on stdin?
> Normally, ntlm_auth, with id and pw passed on the command line prints,
"NT_STATUS_OK: The
> operation completed successfully. (0x0)" to stdout. There is no
further stdin input needed.
>
> Is there a way to disable the --helper-protocol in Dovecot? 
>
>>> After more searching I came across this post,
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=774263
>>> which, in summary, said that ntlm_auth had to run as root. So, I
added the following to my
>>> dovecot config per that post's suggestion:
>>>
>>> service auth {
>>>   user = root
>>> }
>>>
>>> After restarting and trying again to connect from Outlook I got the
message:
>>>
>>> auth: Info: ntlm(?,192.168.0.58,<SCINjFqBKcXAqAA6>): user not
authenticated: NT_STATUS_NO_MEMORY
>> I don't know the full details of how samba/ntlm works, but this
seems like
>> an error coming from the server you're attempting to authenticate
against.
>> I think you should start debugging on the samba side - make sure tools
>> like wbinfo are working, if not then debug those with samba, then move
>> on to Dovecot after you have that working.
> Samba has been running for years (with updates) and everything like wbinfo
works.  Dovecot can
> authenticate with kerberos/GSSAPI, and other applications can authenticate
with ntlm_auth.  My
> suspicion here is that the "user not authenticated" problem is
perhaps because dovecot cannot
> run the auth service as root? The dovecot user is dovenull, so why would it
be permitted to run
> as root in any case?
>
> I think the problem is in invoking ntlm_auth. I tried simply returning zero
from my "fake"
> ntlm_auth, but that didn't work. Not sure what Dovecot is expecting
from ntlm_auth_helper.
>
> --Mark
Hi,

try


service auth {

? user = root

}


Aki

Seemingly Similar Threads

Search for more possibly parallel threads

dovecot - Feb 2019 - Need to authenticate Outlook and NTLM

Need to authenticate Outlook and NTLM

Need to authenticate Outlook and NTLM

Need to authenticate Outlook and NTLM

Need to authenticate Outlook and NTLM

Need to authenticate Outlook and NTLM

Seemingly Similar Threads