[yocto] problem adding a user

[Greg Wilson-Lindberg]

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>
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

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