Installing sshd on W7 reveals errors in CSIH_SCRIPT

Installing sshd on W7 reveals errors in CSIH_SCRIPT

[Houder]

Hi,

Installing sshd on W7 reveals errors in CSIH_SCRIPT ...

CSIH_SCRIPT = /usr/share/csih/cygwin-service-installation-helper.sh

Just now I installed the sshd daemon on my W7 (64-bits Cygwin); I am 
still
using /etc/{passwd,group} as the "database" (i.e. NOT Windows SAM).

Invocation of /usr/bin/ssh-host-config (in an elevated shell) 
genenerated
the following TWO warnings:

   = 1st warning =
passwd: unknown user cyg_server
*** Warning: Setting password expiry for user 'cyg_server' failed!
*** Warning: Please check that password never expires or set it to your 
needs.
   = 2nd warning =
*** Warning: Expected privileged user 'cyg_server' does not exist.
*** Warning: Defaulting to 'SYSTEM' <===== no what I had in mind!

-----

ssh-host-config sources CSIH-SCRIPT

The function if interest in ssh-host-config is: install_service()

install_service() # skeleton of function as executed in my case
   csih_create_privileged_user
   csih_service_should_run_as

# ======================================================================
# Action!
# ======================================================================
... lot of statements
install_service || let warning_cnt+=$? # almost at bottom of file

-----

So the functions of interest in CSIH-SCRIPT are:

  - csih_create_privileged_user
  - csih_service_should_run_as

Near the bottom of csih_create_privileged_use(), "cyg_server" (the 
privileged
user) is ADDED to /etc/passwd ... too late and using the wrong 
statement.

Too late, because the privileged user ("cyg_server") should already have 
been
added near the beginning of this function ...

  - that is why the 1st warning is issued (from 
csih_create_privileged_user() )
  - and because of the wrong statement, "cyg_server" is NOT added to 
/etc/passwd

The 2nd warning is generated from csih_service_should_run_as() for the 
same
reason ("cyg_server" missing from /etc/passwd).
As a side-effect, the sshd service will be created using the "SYSTEM" 
account
i.s.o. "cyg_server" account -- not what was intended!

BTW, the comment at the top of csih_use_file_etc() is WRONG: it should 
read:

# ======================================================================
# Routine: csih_use_file_etc passwd|group
...
#   Returns 1 if files shall be used, 0 otherwise.
# ======================================================================

Regards,

Henri

=
= Skeleton of both functions as executed in my case
=

1.
csih_create_privileged_user() # in case user cyg_server must be created

  # privileged user ("cyg_server") already present?
   csih_privileged_account_exists "$csih_PRIVILEGED_USERNAME"

   # No, it is NOT! Create user ...
   csih_call_winsys32 net user "${csih_PRIVILEGED_USERWINNAME}"

   # make the passwd of the privileged user never expire ...
   if ! passwd -e "${csih_PRIVILEGED_USERNAME}"
   then
    ... WARNING: Setting password expiry for user "cyg_server" failed!
   fi

# Hold on, has user already been added to /etc/passwd (if files is 
preferred
# as the "database")? No, the user has NOT been added yet!
=====> This is why Henri gets his 1st warning ...
=====> ... and why he HAD to add user "cyg_server" to /etc/passwd
=====> ... and has to change the service
            (no, not the "SYSTEM" account, but the "cyg_server" account!)

... a lot more statements

# TOO LATE and using the WRONG variable name!
   # add cyg_server to /etc/passwd ... if and only if  files are used as 
database
   if csih_use_file_etc passwd # yes, Henri uses files as the "database"
   then
# HUH?
     /usr/bin/mkpasswd -l -u "${username}" >> "${SYSCONFDIR}/passwd"
# I believe the statement should have read: i.e. WRONG variable used
     /usr/bin/mkpasswd -l -u "${{csih_PRIVILEGED_USERNAME}" >> 
"${SYSCONFDIR}/passwd"
   fi

2.
csih_service_should_run_as()

... a lot of statements

   if csih_privileged_account_exists "$csih_PRIVILEGED_USERNAME" 1>&2
   then
     # it already existed before this script was launched (comment by 
Corinna)
     echo "$csih_PRIVILEGED_USERNAME"
     return
   elif /usr/bin/getent passwd "${csih_PRIVILEGED_USERNAME}"
   then
     ... ok
   else
     ... Warning: Expected privileged user "cyg_server" does not exist
     echo "SYSTEM" # meaning service will use the SYSTEM account (and not 
the
                   # cyg_server account) -- which is NOT was intended!
   fi

=====

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Re: Installing sshd on W7 reveals errors in CSIH_SCRIPT

[Houder]

On 2017-05-26 21:35, Houder wrote:
> Hi,
> 
> Installing sshd on W7 reveals errors in CSIH_SCRIPT ...
> 
> CSIH_SCRIPT = /usr/share/csih/cygwin-service-installation-helper.sh
> 
> Just now I installed the sshd daemon on my W7 (64-bits Cygwin); I am 
> still
> using /etc/{passwd,group} as the "database" (i.e. NOT Windows SAM).
> 
> Invocation of /usr/bin/ssh-host-config (in an elevated shell) 
> genenerated
> the following TWO warnings:

The error in csih_create_privileged_user() appears to have been 
corrected
already om March 11 2016 (Achim Gratz) ...

commit: 128ed704ed13cda2f3b2e336dba4aeb27a70bdd6

     
https://cygwin.com/git/?p=cygwin-apps/csih.git;a=commit;f=cygwin-service-installation-helper.sh;h=128ed704ed13cda2f3b2e336dba4aeb27a70bdd6

HOWEVER the whole statement (mkpasswd -l ...)must be moved UPWARDS in
the function, as I described in my first post.

The error was originally reported by Nick Batlle in

     https://cygwin.com/ml/cygwin/2016-03/msg00154.html

Regards,

Henri

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Re: Installing sshd on W7 reveals errors in CSIH_SCRIPT -- patch file against master

[Houder]

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On 2017-05-26 21:35, Houder wrote:
> Hi,
> 
> Installing sshd on W7 reveals errors in CSIH_SCRIPT ...
> 
> CSIH_SCRIPT = /usr/share/csih/cygwin-service-installation-helper.sh

Retrieved CSIH_SCRIPT from the master (January 19 2017) here:

     https://cygwin.com/git/?p=cygwin-apps/csih.git;a=summary

Attached patch file against master ...

Regards,
Henri

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: csih.patch --]
[-- Type: text/x-diff; name=csih.patch, Size: 1477 bytes --]

diff --git a/master/cygwin-service-installation-helper.sh b/henri/cygwin-service-installation-helper.sh
index a0b6216..14a40c1 100644
--- a/master/cygwin-service-installation-helper.sh
+++ b/henri/cygwin-service-installation-helper.sh
@@ -2566,7 +2566,7 @@ readonly -f csih_old_cygwin
 #
 #     Otherwise, we need the files.
 #
-#   Returns 0 if files shall be used, 1 otherwise.
+#   Returns 1 if files shall be used, 0 otherwise.
 # ======================================================================
 csih_use_file_etc()
 {
@@ -3003,6 +3003,12 @@ csih_create_privileged_user()
 	  csih_inform "the '${csih_PRIVILEGED_USERNAME}' account."
 	  echo ""
 
+          # If we use /etc account DB only, write new account to /etc/passwd
+          if csih_use_file_etc passwd
+          then
+            /usr/bin/mkpasswd -l -u "${csih_PRIVILEGED_USERNAME}" >> "${SYSCONFDIR}/passwd"
+          fi
+
 	  if ! passwd -e "${csih_PRIVILEGED_USERNAME}" >/dev/null
 	  then
 	    csih_warning "Setting password expiry for user '${csih_PRIVILEGED_USERNAME}' failed!"
@@ -3063,12 +3069,6 @@ csih_create_privileged_user()
         fi
       fi
 
-      # If we use /etc account DB only, write new account to /etc/passwd
-      if csih_use_file_etc passwd
-      then
-	/usr/bin/mkpasswd -l -u "${csih_PRIVILEGED_USERNAME}" >> "${SYSCONFDIR}/passwd"
-      fi
-
       return "${ret}"
     fi # ! username_in_sam
     return 1 # failed to create user (or prevented by auto-answer veto)

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Re: Installing sshd on W7 reveals errors in CSIH_SCRIPT -- patch file against master

[Houder]

On Sat, 27 May 2017 14:01:09, Houder wrote:
> --=_f8e475c11eb2497bb7b3a74fbbff7888
> Content-Transfer-Encoding: 7bit
> Content-Type: text/plain; charset=US-ASCII;
>  format=flowed
> 
> On 2017-05-26 21:35, Houder wrote:
> > Hi,
> > 
> > Installing sshd on W7 reveals errors in CSIH_SCRIPT ...
> > 
> > CSIH_SCRIPT = /usr/share/csih/cygwin-service-installation-helper.sh
> 
> Retrieved CSIH_SCRIPT from the master (January 19 2017) here:
> 
>      https://cygwin.com/git/?p=cygwin-apps/csih.git;a=summary
> 
> Attached patch file against master ...

Oh, by the way ...

My sshd daemon works flawlessly on W7 ... despite the fact the I am still
using /etc/passwd and /etc/group as the "database" (i.s.o. Windows' SAM).

(despite F-Secure SAFE, being a mandatory requirement for my machine).

(and, of course, despite the consequences of the errors in CSIH_SCRIPT; I
 took care of them).

Regards,

Henri

-----
/etc/nsswitch.conf:

# 31 10 2014

# "db" = any 'place' where Windows keeps account info (my case: local SAM?)

# as far as I can tell, the next two lines forces the Cygwin1.dll to retrieve the account
# info solely from /etc/passwd and /etc/group, i.e. Windows' "db" is ignored ...
#
passwd: files
group: files

# as far as I can tell, this line applies to getent (i.e. getpwent() and getgrent())
db_enum: files

/etc/passwd:

SYSTEM:*:18:18:U-NT AUTHORITY\SYSTEM,S-1-5-18:/home/SYSTEM:/bin/bash
LOCAL SERVICE:*:19:19:,S-1-5-19:/:/sbin/nologin
NETWORK SERVICE:*:20:20:,S-1-5-20:/:/sbin/nologin
Administrators:*:544:544:,S-1-5-32-544:/:/sbin/nologin
..
cyg_server:*:1014:513:Privileged server,U-Seven\cyg_server,S-1-5-21-91509220-1575020443-2714799223-1014:/var/empty:/bin/bash
Henri:*:1000:513:U-Seven\Henri,S-1-5-21-91509220-1575020443-2714799223-1000:/home/Henri:/bin/bash
..
sshd:*:1013:513:U-Seven\sshd,S-1-5-21-91509220-1575020443-2714799223-1013:/var/empty:/bin/bash

/etc/group:

SYSTEM:S-1-5-18:18:
..
Administrators:S-1-5-32-544:544:
..
None:S-1-5-21-91509220-1575020443-2714799223-513:513:
..

@@ ls -ld ~ ~/.ssh
drwxr-xr-x+ 1 Henri None 0 May 27 08:16 /home/Henri
# modified by me? (744 => 700) ... not really required ...
drwx------+ 1 Henri None 0 May 26 13:22 /home/Henri/.ssh

@@ ls -l /etc/ssh*
-rw-r--r-- 1 cyg_server Administrators 1680 May 26 13:15 /etc/ssh_config
-rw------- 1 cyg_server Administrators  668 Jul 25  2016 /etc/ssh_host_<X-key>
-rw-r--r-- 1 cyg_server Administrators  601 Jul 25  2016 /etc/ssh_host_<X-key>.pub
-rw-r--r-- 1 cyg_server Administrators 3225 May 26 16:44 /etc/sshd_config

@@ ls -ld /var/empty /var/run
drwxr-xr-x+ 1 cyg_server Administrators 0 May 26 12:45 /var/empty
drwxrwxrwt+ 1 Henri      None           0 May 26 21:28 /var/run

 - "/var/empty must be owned by root and not group or world-writable."
 - that is, owned by "cyg_server" (the privileged account, acting as the root user here)

@@ ls -l /var/run
-rw-r--r-- 1 cyg_server None   5 May 27 07:54 sshd.pid
# modified permissions to 660 for aestetic reason only
-rw-rw---- 1 Henri      None 640 May 26 18:50 utmp

@@ ls -l /var/log/sshd.log # file exists if one has redirected the output of sshd.exe ...
-rw-r--r-- 1 cyg_server None 1767 May 26 21:28 /var/log/sshd.log

@@ getfacl /var/tmp # relevant here is ownership by cyg_server ...
# file: /var/empty
# owner: cyg_server
# group: Administrators
user::rwx
group::r-x
group:SYSTEM:r-x
group:Administrators:r-x
mask:r-x
other:r-x
default:user::rwx
default:group::r-x
default:other:r-x

@@ getfacl /var/run
# file: /var/run
# owner: Henri
# group: None
# flags: --t
user::rwx
group::rwx
group:SYSTEM:rwx
group:Administrators:rwx
mask:rwx
other:rwx
default:user::rwx
default:group::r-x
default:other:r-x

=====


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Re: Installing sshd on W7 reveals errors in CSIH_SCRIPT -- patch file against master

[Corinna Vinschen]

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Hi Houder,

On May 27 14:01, Houder wrote:
> On 2017-05-26 21:35, Houder wrote:
> > Hi,
> > 
> > Installing sshd on W7 reveals errors in CSIH_SCRIPT ...
> > 
> > CSIH_SCRIPT = /usr/share/csih/cygwin-service-installation-helper.sh
> 
> Retrieved CSIH_SCRIPT from the master (January 19 2017) here:
> 
>     https://cygwin.com/git/?p=cygwin-apps/csih.git;a=summary
> 
> Attached patch file against master ...

Can you please recreate the patch with `git format-patch' and attach
it to your reply?  That would be most helpful.


Thanks,
Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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Re: Installing sshd on W7 reveals errors in CSIH_SCRIPT -- patch file against master

[Houder]

On Wed, 7 Jun 2017 11:15:01, Corinna Vinschen wrote:
> --24zk1gE8NUlDmwG9
> Content-Type: text/plain; charset=utf-8
> Content-Disposition: inline
> Content-Transfer-Encoding: quoted-printable
> 
> Hi Houder,
> 
> On May 27 14:01, Houder wrote:
> > On 2017-05-26 21:35, Houder wrote:
> > > Hi,
> > >=20
> > > Installing sshd on W7 reveals errors in CSIH_SCRIPT ...
> > >=20
> > > CSIH_SCRIPT =3D /usr/share/csih/cygwin-service-installation-helper.sh
> >=20
> > Retrieved CSIH_SCRIPT from the master (January 19 2017) here:
> >=20
> >     https://cygwin.com/git/?p=3Dcygwin-apps/csih.git;a=3Dsummary
> >=20
> > Attached patch file against master ...
> 
> Can you please recreate the patch with `git format-patch' and attach
> it to your reply?  That would be most helpful.

Sigh! ... it has been years and YEARS! since I exercised git. So I attempted
to do what you are asking for ...

 - cloned csih
 - branched
 - created TWO fixes in that branch
 - invoked 'git format-patch -n HEAD^^' # which is completely new to

Two files were created ... I included them here. Sufficient?

Regards,
Henri

-----

File 0001-Amend-prologue-of-csih_use_file_etc.patch:

From 2d96db1b32df33b142aa23afaa90ad21db74cc3d Mon Sep 17 00:00:00 2001
From: "J.H. van de Water" <houder@xs4all.nl>
Date: Wed, 7 Jun 2017 13:28:21 +0200
Subject: [PATCH 1/2] Amend prologue of csih_use_file_etc

Prologue (bottom) of csih_use_file_etc should state:

    Returns 1 if files shall be used, 0 otherwise.

Currently it states the reverse.
---
 cygwin-service-installation-helper.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cygwin-service-installation-helper.sh b/cygwin-service-installation-helper.sh
index a0b6216..f291edc 100755
--- a/cygwin-service-installation-helper.sh
+++ b/cygwin-service-installation-helper.sh
@@ -2566,7 +2566,7 @@ readonly -f csih_old_cygwin
 #
 #     Otherwise, we need the files.
 #
-#   Returns 0 if files shall be used, 1 otherwise.
+#   Returns 1 if files shall be used, 0 otherwise.
 # ======================================================================
 csih_use_file_etc()
 {
-- 
2.7.5

-----

File 0002-Move-call-of-mkpasswd-UPwards-in-csih_create_privile.patch:

From d07d3a567f063d22c9eba381cbcc987b63a8eabb Mon Sep 17 00:00:00 2001
From: "J.H. van de Water" <houder@xs4all.nl>
Date: Wed, 7 Jun 2017 13:36:27 +0200
Subject: [PATCH 2/2] Move call of mkpasswd UPwards in
 csih_create_privileged_user

Move call of mkpasswd UPwards in csih_create_privileged_user, and place it
before the 1st call of passwd.
---
 cygwin-service-installation-helper.sh | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/cygwin-service-installation-helper.sh b/cygwin-service-installation-helper.sh
index f291edc..14a40c1 100755
--- a/cygwin-service-installation-helper.sh
+++ b/cygwin-service-installation-helper.sh
@@ -3003,6 +3003,12 @@ csih_create_privileged_user()
 	  csih_inform "the '${csih_PRIVILEGED_USERNAME}' account."
 	  echo ""
 
+          # If we use /etc account DB only, write new account to /etc/passwd
+          if csih_use_file_etc passwd
+          then
+            /usr/bin/mkpasswd -l -u "${csih_PRIVILEGED_USERNAME}" >> "${SYSCONFDIR}/passwd"
+          fi
+
 	  if ! passwd -e "${csih_PRIVILEGED_USERNAME}" >/dev/null
 	  then
 	    csih_warning "Setting password expiry for user '${csih_PRIVILEGED_USERNAME}' failed!"
@@ -3063,12 +3069,6 @@ csih_create_privileged_user()
         fi
       fi
 
-      # If we use /etc account DB only, write new account to /etc/passwd
-      if csih_use_file_etc passwd
-      then
-	/usr/bin/mkpasswd -l -u "${csih_PRIVILEGED_USERNAME}" >> "${SYSCONFDIR}/passwd"
-      fi
-
       return "${ret}"
     fi # ! username_in_sam
     return 1 # failed to create user (or prevented by auto-answer veto)
-- 
2.7.5

=====


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Re: Installing sshd on W7 reveals errors in CSIH_SCRIPT -- patch file against master

[Corinna Vinschen]

[-- Attachment #1: Type: text/plain, Size: 1704 bytes --]

On Jun  7 13:57, Houder wrote:
> On Wed, 7 Jun 2017 11:15:01, Corinna Vinschen wrote:
> > --24zk1gE8NUlDmwG9
> > Content-Type: text/plain; charset=utf-8
> > Content-Disposition: inline
> > Content-Transfer-Encoding: quoted-printable
> > 
> > Hi Houder,
> > 
> > On May 27 14:01, Houder wrote:
> > > On 2017-05-26 21:35, Houder wrote:
> > > > Hi,
> > > >=20
> > > > Installing sshd on W7 reveals errors in CSIH_SCRIPT ...
> > > >=20
> > > > CSIH_SCRIPT =3D /usr/share/csih/cygwin-service-installation-helper.sh
> > >=20
> > > Retrieved CSIH_SCRIPT from the master (January 19 2017) here:
> > >=20
> > >     https://cygwin.com/git/?p=3Dcygwin-apps/csih.git;a=3Dsummary
> > >=20
> > > Attached patch file against master ...
> > 
> > Can you please recreate the patch with `git format-patch' and attach
> > it to your reply?  That would be most helpful.
> 
> Sigh! ... it has been years and YEARS! since I exercised git. So I attempted
> to do what you are asking for ...
> 
>  - cloned csih
>  - branched
>  - created TWO fixes in that branch
>  - invoked 'git format-patch -n HEAD^^' # which is completely new to
> 
> Two files were created ... I included them here. Sufficient?

Well, this is pretty awkward.  I have to extract the patches from the
mail and apply them then.  It's easier to have them as *real* attachments,
or just sent as patch series by `git send-email'C, so they apply without
having to edit them.

But, either way, for now I just extracted them and pushed your patches.


Thanks,
Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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Re: Installing sshd on W7 reveals errors in CSIH_SCRIPT -- patch file against master

[Houder]

On Wed, 7 Jun 2017 16:35:57, Corinna Vinschen wrote:

[snip]
> > Sigh! ... it has been years and YEARS! since I exercised git. So I attemp=
> ted
> > to do what you are asking for ...
> >=20
> >  - cloned csih
> >  - branched
> >  - created TWO fixes in that branch
> >  - invoked 'git format-patch -n HEAD^^' # which is completely new to
> >=20
> > Two files were created ... I included them here. Sufficient?
> 
> Well, this is pretty awkward.  I have to extract the patches from the
> mail and apply them then.  It's easier to have them as *real* attachments,
> or just sent as patch series by `git send-email'C, so they apply without
> having to edit them.

Sorry ...

My regular MUA does not support 'In-Reply-to' ...

Therefore I cannot use my regular MUA, as I am NOT subcribed to the list; for
this reason, I make use of a kludge, which allows me to respond to the thread.

However this kludge does not support sending attachments.

Next time I will do both. Respond to the thread with a reply that will refer
to a message (sent by my regular MUA) which will have the attachements.

Would that fullfil all requirements?

Regards,

Henri


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Re: Installing sshd on W7 reveals errors in CSIH_SCRIPT -- patch file against master

[Corinna Vinschen]

[-- Attachment #1: Type: text/plain, Size: 1699 bytes --]

On Jun  7 20:17, Houder wrote:
> On Wed, 7 Jun 2017 16:35:57, Corinna Vinschen wrote:
> 
> [snip]
> > > Sigh! ... it has been years and YEARS! since I exercised git. So I attemp=
> > ted
> > > to do what you are asking for ...
> > >=20
> > >  - cloned csih
> > >  - branched
> > >  - created TWO fixes in that branch
> > >  - invoked 'git format-patch -n HEAD^^' # which is completely new to
> > >=20
> > > Two files were created ... I included them here. Sufficient?
> > 
> > Well, this is pretty awkward.  I have to extract the patches from the
> > mail and apply them then.  It's easier to have them as *real* attachments,
> > or just sent as patch series by `git send-email'C, so they apply without
> > having to edit them.
> 
> Sorry ...
> 
> My regular MUA does not support 'In-Reply-to' ...
> 
> Therefore I cannot use my regular MUA, as I am NOT subcribed to the list; for
> this reason, I make use of a kludge, which allows me to respond to the thread.

`git send-email' creates the correct information automatically and it
doesn't use your MUA at all, so that's the easiest way to send patches
to a list, usually.

> However this kludge does not support sending attachments.
> 
> Next time I will do both. Respond to the thread with a reply that will refer
> to a message (sent by my regular MUA) which will have the attachements.
> 
> Would that fullfil all requirements?

It's not about "requirements" per se, it's just about making the stuff
easy for the typical, lazy maintainer ;)


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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