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/*
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** Copyright 1998 - 2000 Double Precision, Inc. See COPYING for
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** distribution information.
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*/
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/types.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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2
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#include <string.h>
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#include <grp.h>
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#include <pwd.h>
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#include <errno.h>
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#include "auth.h"
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2
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static const char rcsid[]="$Id: changeuidgid.c,v 1.2 2000/12/18 20:20:10 bruce Exp $";
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0
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void authchangegroup(gid_t gid)
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{
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if ( setgid(gid))
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{
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perror("setgid");
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authexit(1);
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}
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#if HAVE_SETGROUPS
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if ( getuid() == 0 && setgroups(1, &gid) )
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{
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perror("setgroups");
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authexit(1);
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}
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#endif
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}
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void authchangeuidgid(uid_t uid, gid_t gid)
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{
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authchangegroup(gid);
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if ( setuid(uid))
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{
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perror("setuid");
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authexit(1);
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}
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}
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void authchangeusername(const char *uname, const gid_t *forcegrp)
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{
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struct passwd *pw;
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uid_t changeuid;
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gid_t changegid;
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/* uname might be a pointer returned from a previous called to getpw(),
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** and libc has a problem getting it back.
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*/
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char *p=malloc(strlen(uname)+1);
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if (!p)
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{
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perror("malloc");
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authexit(1);
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}
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strcpy(p, uname);
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errno=ENOENT;
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if ((pw=getpwnam(p)) == 0)
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{
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free(p);
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perror("getpwnam");
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authexit(1);
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}
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free(p);
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changeuid=pw->pw_uid;
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if ( !forcegrp ) forcegrp= &pw->pw_gid;
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changegid= *forcegrp;
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if ( setgid( changegid ))
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{
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perror("setgid");
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authexit(1);
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}
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#if HAVE_INITGROUPS
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if ( getuid() == 0 && initgroups(pw->pw_name, changegid) )
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{
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perror("initgroups");
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authexit(1);
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}
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#else
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#if HAVE_SETGROUPS
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if ( getuid() == 0 && setgroups(1, &changegid) )
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{
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perror("setgroups");
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authexit(1);
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}
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#endif
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#endif
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if (setuid(changeuid))
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{
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perror("setuid");
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authexit(1);
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}
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}
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