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passwd and usermod
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 passwd and usermod - Nov. 20, '04, 4:35:52 PM
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cortez_
Posts: 330
Joined: Mar. 27, '04,
From: Poland
Status: offline
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Can you tell me the difference between the passwd command and usermod script? I've been trying to change password for one of the users on my system and thought I can as well do it via interix passwd. But when I type passwd username it asks me for password even though I'm the admin and when I type the old password for him and the new password then the error message appeares: password not changed. Bas address.
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RE: passwd and usermod - Nov. 20, '04, 10:57:31 PM
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markfunk
Posts: 673
Joined: Mar. 31, '03,
Status: offline
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usermod does work differently than /bin/passwd and is sometimes more forgiving.
But you cannot use the scripts in /usr/examples/admin that are distributed
with SFU 3.0 and 3.5. These scripts were written for Interix 2.2 and do not work very well on 3.x.
You need to get the updated versions I wrote and are on the Microsoft web site. They are referenece via one of the Interix white papers. The one that talks about System Administration with Interix.
Try:
http://www.microsoft.com/downloads/details.aspx?FamilyID=9e189a1b-6b9c-45f2-8a46-58393b12ce32&displaylang=en
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RE: passwd and usermod - Nov. 21, '04, 2:54:50 AM
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cortez_
Posts: 330
Joined: Mar. 27, '04,
From: Poland
Status: offline
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And what about the error message that passwd produces?
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RE: passwd and usermod - Nov. 21, '04, 10:47:26 PM
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markfunk
Posts: 673
Joined: Mar. 31, '03,
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re: error message that says "Bad address".
You get this when a system call/library routine returns EFAULT.
This could mean that /bin/passwd or the chpass(2) system call has a bug.
Try "truss /bin/passwd ...." and see if chpass() is being called and
It might help if you could provide the cut/paste of the following:
$ /bin/id
$ /bin/pdomain
$ /bin/passwd .....
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RE: passwd and usermod - Nov. 22, '04, 2:48:59 AM
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cortez_
Posts: 330
Joined: Mar. 27, '04,
From: Poland
Status: offline
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root ~#>id
uid=197611(root) gid=197121(Brak) groups=197121(Brak), 65792(+Wszyscy), 131616(+Administratorzy), 4095(CurrentSession), 66048(+LOKALNY), 66820(+INTERAKTYWNA), 66827(+Użytkownicy uwierzytelnieni)
root ~#>pdomain
CORTEZ
when I run truss passwd user I got the chpass executed and exited with an error:
chpass() chpass failed: errno 14, Bad address
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RE: passwd and usermod - Nov. 23, '04, 8:58:42 AM
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markfunk
Posts: 673
Joined: Mar. 31, '03,
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You didn't give us the /bin/passwd command line you used.
All evidence so far indicate it's a bug in chpass() or in /bin/passwd.
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RE: passwd and usermod - Nov. 23, '04, 9:30:05 AM
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cortez_
Posts: 330
Joined: Mar. 27, '04,
From: Poland
Status: offline
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/bin/passwd megi
megi is the name of an user other than the root that has been executing the command
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RE: passwd and usermod - Nov. 23, '04, 10:00:57 AM
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markfunk
Posts: 673
Joined: Mar. 31, '03,
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thanks. So megi is really "cortez+megi", right ?
Just making sure this was a straight forward request.
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RE: passwd and usermod - Nov. 23, '04, 10:40:02 AM
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cortez_
Posts: 330
Joined: Mar. 27, '04,
From: Poland
Status: offline
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megi is a local user and if I'm correct in my nightmare assumptions it might in fact be the CORTEZ+megi where CORTEZ is the name of the computer in win32 world.
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RE: passwd and usermod - Feb. 8, '05, 7:25:21 PM
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prj32
Posts: 29
Joined: Oct. 16, '04,
Status: offline
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Any resolution with the bad address problem when using passwd? I get the same problem on SFU 3.5.
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RE: passwd and usermod - Feb. 8, '05, 10:47:21 PM
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markfunk
Posts: 673
Joined: Mar. 31, '03,
Status: offline
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The message "bad address" is caused by an EFAULT in the code.
This usually means there was a bug in the user application
(in this case, /bin/passwd).
It looks like the program /bin/passwd is not passing a
fully qualified name to the chpass() system call.
This is one case in which I can repro the behaviour.
(the other case is if the account is "disabled")
So, the workaround is to use a fully qualified user name
(ie /bin/passwd cortez+megi )
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RE: passwd and usermod - Feb. 9, '05, 12:20:33 AM
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prj32
Posts: 29
Joined: Oct. 16, '04,
Status: offline
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You guys working on a fix? because even the fq /bin/passwd doesn't work for me.
< Message edited by prj32 -- Feb. 9, '05, 12:27:18 AM >
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RE: passwd and usermod - Feb. 9, '05, 3:11:33 AM
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cortez_
Posts: 330
Joined: Mar. 27, '04,
From: Poland
Status: offline
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I gave up, in case I have the sources of the interix passwd I could do some digging, but I doubt if the bsd or gnu sources will do...
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RE: passwd and usermod - Feb. 9, '05, 12:30:18 PM
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Rodney
Posts: 3729
Joined: Jul. 9, '02,
From: /Tools lab
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There is not much code to passwd.
The key API call is chpass() for which there is a man page.
Around the call to chpass() is the code that asks for a new password
(repeat to make sure) and then some (optional) code to check for a "good"
password. It's pretty easy to do.
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RE: passwd and usermod - Feb. 10, '05, 3:24:43 AM
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cortez_
Posts: 330
Joined: Mar. 27, '04,
From: Poland
Status: offline
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Where can I find the source of passwd to look deeper inside? Would the gnu passwd be OK (I doubt)? Or somewhere else?
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RE: passwd and usermod - Feb. 10, '05, 11:35:18 AM
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Rodney
Posts: 3729
Joined: Jul. 9, '02,
From: /Tools lab
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The password for Interix was written from scratch as I recall.
You can write, compile and link it in about 20 minutes for a first draft.
In pseudo-code it goes like this:
p = getpass();
p1 = strdup(p);
p = getpass(); /* double check the entry */
if (p1 != p)
error
else
ret = chpass(user, p)
if (ret == error)
write error
else
write success
You can get the user name with a getpwuid(getuid()).
You can add good password cheecking if you want.
The above is the core of it.
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RE: passwd and usermod - Feb. 10, '05, 10:54:33 PM
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markfunk
Posts: 673
Joined: Mar. 31, '03,
Status: offline
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1) chpass() takes 3 args: fqusername, oldpasswd, newpasswd
2) use getpwuid_ex() so that you get back the fully qualifed username.
This is the problem that is currently in /bin/passwd.
3) If you're getting the EFAULT problem with a fully qualified
username using /bin/passwd, then it is possible the bug is in chpass().
You can test this by using my program:
quote:
#include <errno.h>
main(int argc, char **argv)
{
char *user = argv[1];
char *oldpass = argv[2];
char *newpass = argv[3];
int x;
printf("user = '%s', oldpass = '%s', newpass = '%s'\n",
user, oldpass, newpass);
x = chpass(user, oldpass, newpass);
if (x == 0) {
printf("success\n");
} else {
printf("error: (%d) %s\n", errno, strerror(errno));
}
}
Usage: ./chpass domain+username oldpass newpass
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RE: passwd and usermod - Feb. 11, '05, 2:16:34 AM
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Rodney
Posts: 3729
Joined: Jul. 9, '02,
From: /Tools lab
Status: offline
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I'm just posting up a /Tools version of passwd.
This is a from scratch version. I mention this since I wrote passwd
back in the Softway (pre-MS) days (yeah, that's my user account on the man page).
This version does use getpwuid_ex(). (Though this API didn't exist when passwd was originally written).
Install it and see how it goes for you. Let us know.
pkg_add ftp://ftp.interopsystems.com/pkgs/3.5/passwd-current-bin.tgz
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RE: passwd and usermod - Feb. 14, '05, 3:06:43 AM
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cortez_
Posts: 330
Joined: Mar. 27, '04,
From: Poland
Status: offline
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Now it seems to be working fine (identifies user).
Thanks a lot ;)
Now only the ssh issue keeps me upset :(
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RE: passwd and usermod - Feb. 14, '05, 6:08:23 PM
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prj32
Posts: 29
Joined: Oct. 16, '04,
Status: offline
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works a treat!
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