[yocto] problem adding a user

Wed May 15 13:53:16 PDT 2019

Thank you very much, that got me back on the right path.
Maybe I'll see you at the Yocto day at the Embedded Linux Conference.
Regards,

Greg Wilson-Lindberg

Principal Firmware Engineer | Sakura Finetek USA, Inc.

1750 W 214th Street | Torrance, CA 90501 | U.S.A.

T: +1 310 783 5075

F: +1 310 618 6902 | E: gwilson at sakuraus.com<mailto:gwilson at sakuraus.com>

www.sakuraus.com<http://www.sakuraus.com>

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From: Rudolf J Streif [mailto:rudolf.streif at ibeeto.com]
Sent: Wednesday, May 15, 2019 01:30 PM
To: Greg Wilson-Lindberg <GWilson at sakuraus.com>; Yocto list discussion <yocto at yoctoproject.org>
Subject: Re: [yocto] problem adding a user

Instead of

useradd -p `openssl passwd test` sakura

which attempts to add the user and set the password which fails if the user already exists, use

usermod -p `openssl passwd test` sakura

which sets the user's password.

:rjs

On 5/15/19 1:18 PM, Greg Wilson-Lindberg wrote:

Ok, I had been using the useradd class in a couple of other recipes to allow me to copy files to the sakura user directory and another location, but owned by sakura. That seems to have been what was causing the problem.

I had been using the extrausers class in my top level image recipe.

So now how do I get all of this to work together? Do I need to put everything that touches the sakura user in the same recipe? It seems that I need to use only one of the useradd or extrausers classes?

Greg
________________________________
From: Rudolf J Streif <rudolf.streif at ibeeto.com><mailto:rudolf.streif at ibeeto.com>
Sent: Wednesday, May 15, 2019 12:31 PM
To: Greg Wilson-Lindberg; Yocto list discussion
Subject: Re: [yocto] problem adding a user

The ! for the password in /etc/shadow indicates that the account is disabled:

sakura:!:18031:0:99999:7:::

Either there is something wrong with the password generation or it gets disabled by something else. Maybe it's worth trying with a plain image without Boot2Qt or anything else.

:rjs

On 5/15/19 11:46 AM, Greg Wilson-Lindberg wrote:

Hi Rudolf,

1st, yes I inherit extrausers. Attached are the passwd & shadow files.

It shouldn't make any difference, but I'm building this for an RPi3 using the Qt Boot2Qt version of the Yocto environment, distro 2.5.3.

Greg
________________________________
From: Rudolf J Streif <rudolf.streif at ibeeto.com><mailto:rudolf.streif at ibeeto.com>
Sent: Wednesday, May 15, 2019 11:26 AM
To: Greg Wilson-Lindberg; Yocto list discussion
Subject: Re: [yocto] problem adding a user

Hi Greg,

> I've also tried both the back-quote and the single-quote, no difference.

Help me to understand this. the back-quotes are the right ones. If you use the single ones your password in the /etc/shadow ends up being 'openssl passwd test' (without the quotes), unless the build fails because of a parsing error (I have not tried it). Silly question, you did inherit extrausers class?

Can you post your /etc/passwd and /etc/shadow

I am surprised that this does not work with your setup. I have been doing this a gazillion times always with success.

:rjs

On 5/15/19 11:03 AM, Greg Wilson-Lindberg wrote:

Hi Rudolf,

Thanks for the reply, and the information on how openssl works.

I'm trying to create a user with the same group name so the code that I'm using reduces to:

EXTRA_USERS_PARAMS = "\

    useradd -p `openssl passwd test` sakura; \

    usermod -a -G sudo ${SAKURA_USER}; \

    "
I also, as you can see, removed the macros to eliminate as much confusion as possible.

I still can't login in using the password 'test'.

I've also tried both the back-quote and the single-quote, no difference.

Regards,

Greg

________________________________
From: Rudolf J Streif <rudolf.streif at ibeeto.com><mailto:rudolf.streif at ibeeto.com>
Sent: Wednesday, May 15, 2019 10:07:47 AM
To: Greg Wilson-Lindberg; Yocto list discussion
Subject: Re: [yocto] problem adding a user

Hi Greg,

Well, I suppose I wrote the book you are referring to...

Using

useradd -p PASSWORD USER

takes the password hash for PASSWORD hence the use of openssl in:

useadd -p `openssl passwd PASSWORD` USER

openssl password creates the password hash using the original crypt hash
algorithm if no other options are specified. e.g.

$ openssl passwd hello
6hEsTksgRkeiI

With this the first two characters of the output is the salt and the
rest is the password hash. If you want openssl to create the same result
again:

$ openssl passwd -salt "6h" hello
6hEsTksgRkeiI

You can use newer algorithms like MD5 based BSD password algorithm 1:

$ openssl passwd -1 hello
$1$4Mu8Fcs.$eIKgPP7RCYrb3lFZjhADA1

$1 : password algorithm 1
$4Mu8Fcs. : salt
$eIKgPP7RCYrb3lFZjhADA1 : password hash

If you log into the system you have to use the clear password. The
system reads the salt, creates the password hash and compares the results.

:rjs

On 5/14/19 5:34 PM, Greg Wilson-Lindberg wrote:
> I'm trying to use the example in "Embedded Linux Systems with the Yocto Project" to add a user to my Yocto build. In the book the sample code:
>
>     useradd -p `openssl passwd ${DEV_PASSWORD}` developer; \
>
> uses openssl to generate the encrypted password string to pass to useradd. I have never been able to get this to work. When I run the openssl
> command on the cmd line I get a different value every time, this seems wrong, How can the password code compare against it if every encode
> produces a different value?
>
> I am getting the user added to the system, the home directory shows up and the user is in the passwd and group files. I just can't login to the
> account.
>
> I've obviously got something confused, any help would be appreciated.
>
> Greg Wilson-Lindberg
>

--
-----
Rudolf J Streif
CEO/CTO ibeeto
+1.855.442.3396 x700

--

-----

Rudolf J Streif

CEO/CTO ibeeto

+1.855.442.3396 x700

--

-----

Rudolf J Streif

CEO/CTO ibeeto

+1.855.442.3396 x700

--

-----

Rudolf J Streif

CEO/CTO ibeeto

+1.855.442.3396 x700
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