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How to use admin passwords with "C"
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Join Date: Apr 2007
Posts: 53
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Junior Poster in Training
Hello All:
I have a question: How can you perform Password Administration using "C-Programming" functions.
Basically, we had UNIX Shell script that performed the following:
1. Got the current users password.
2. Did a time computation on it - had it expired yet, and when it will
3. Queried if the user wanted to change their password.
Well, after the time calculations and other UNIX issues, managment decided that it would be better just to use "C" to do these same functions. Start a C-process, pass the appropriate parameters, and perform the appropriate password processing, if necessary.
Can anyone direct me to where I can get more information on this? I am currently utilizing the AIX 4.3 version of UNIX.
Thanks again, for your help in advance....
I have a question: How can you perform Password Administration using "C-Programming" functions.
Basically, we had UNIX Shell script that performed the following:
1. Got the current users password.
2. Did a time computation on it - had it expired yet, and when it will
3. Queried if the user wanted to change their password.
Well, after the time calculations and other UNIX issues, managment decided that it would be better just to use "C" to do these same functions. Start a C-process, pass the appropriate parameters, and perform the appropriate password processing, if necessary.
Can anyone direct me to where I can get more information on this? I am currently utilizing the AIX 4.3 version of UNIX.
Thanks again, for your help in advance....
"....We will add your Biological and Technological distinctiveness to our Own....Resistance is Futile....You will be Assimilated...."
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Join Date: Aug 2005
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can't you just translate that shell program into c? That is, write a c program that makes the same system calls ?
Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.
As much as i know, there are no system calls for doing all that in POSIX http://opengroup.org/onlinepubs/007908799 nothing about password expiry. All that can be done though with commands, again i'm not entirely sure whether all of these are POSIX. The shell script likely used commands, and it is not always possible to replace all commands with UNIX functions, there are no equivalent ones for every command. Some of the necessary data is likely in the file etc/shadow
Last edited by TkTkorrovi; Jul 16th, 2007 at 7:26 pm.
Knowledge is regarded by the fool as ignorance, and the things that are profitable are to him hurtful. He liveth in death. -- Thoth the Atlantean
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Join Date: Apr 2007
Posts: 53
Reputation:
Solved Threads: 1
Junior Poster in Training
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Originally Posted by TkTkorrovi 
As much as i know, there are no system calls for doing all that in POSIX http://opengroup.org/onlinepubs/007908799 nothing about password expiry. All that can be done though with commands, again i'm not entirely sure whether all of these are POSIX. The shell script likely used commands, and it is not always possible to replace all commands with UNIX functions, there are no equivalent ones for every command. Some of the necessary data is likely in the file etc/shadow
I did happen to find the getuserattr and putuserattr calls in "C". Now I just got to figure out how these gizmo's really work.....
Thanks!
"....We will add your Biological and Technological distinctiveness to our Own....Resistance is Futile....You will be Assimilated...."
getuserattr and putuserattr are some solaris functions or such, i found them nowhere in debian. The command usermod can be used to change these attributes. But to read these attributes, the only way seems to be to read the file /etc/shadow, which is not difficult, the format of this file is there: http://www.cyberciti.biz/faq/underst...etcshadow-file
Knowledge is regarded by the fool as ignorance, and the things that are profitable are to him hurtful. He liveth in death. -- Thoth the Atlantean
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