Mail Archives: cygwin/2003/03/20/16:48:13
You are right. seteuid is failing.
I have given vishalj the following rights as mentioned in user doc
An important restriction is that the application using LogonUser must have
special permissions:
"Act as part of the operating system"
"Replace process level token"
"Increase quotas"
Also user vishalj belongs to Administrators group.
/etc/passwd has that information.
Are there any more priveleges I need to give?
thanks,
Vishal
-----Original Message-----
From: Andrew DeFaria [mailto:ADeFaria AT Salira DOT com]
Sent: Thursday, March 20, 2003 1:17 PM
To: cygwin AT cygwin DOT com
Subject: Re: seteuid and file ownership
You might start by checking the status after the setuid call. Perhaps it
failed.
Vishal Jain wrote:
>Hi,
>I am making a seteuid() call to impersonate user "shweta".
>Then I create a file. When I do ls -l on the file, it shows the owner as
>"vishalj" which was the user before doing impersonation.
>-rw-rw-rw- 1 vishalj mkgroup 0 Mar 20 12:50 shweta
>Is this expected behaviour in cygwin?
>I am attaching the code snippet-
>
>#include <windows.h>
>#include <sys/cygwin.h>
>#include <stdio.h>
>#include <pwd.h>
>
>int main(int argc, char *argv[]){
> HANDLE token = INVALID_HANDLE_VALUE;
> struct passwd *pw = NULL;
> FILE *fp = NULL;
> pw = getpwnam("shweta");
> token = cygwin_logon_user(pw, "shweta");
> if(token == INVALID_HANDLE_VALUE){
> printf("Login failed\n");
> }
> cygwin_set_impersonation_token(token);
> seteuid(pw->pw_uid);
> fp = fopen("shweta", "w");
> if(fp == NULL){
> printf("could not open file for writing\n");
> }
> fclose(fp);
>}
>
>Thanks,
>Vishal
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