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/*++
/* NAME
/* dot_lockfile_as 3
/* SUMMARY
/* dotlock file as user
/* SYNOPSIS
/* #include <dot_lockfile_as.h>
/*
/* int dot_lockfile_as(path, why, euid, egid)
/* const char *path;
/* VSTRING *why;
/* uid_t euid;
/* gid_t egid;
/*
/* void dot_unlockfile_as(path, euid, egid)
/* const char *path;
/* uid_t euid;
/* gid_t egid;
/* DESCRIPTION
/* dot_lockfile_as() and dot_unlockfile_as() are wrappers around
/* the dot_lockfile() and dot_unlockfile() routines. The routines
/* change privilege to the designated privilege, perform the
/* requested operation, and restore privileges.
/* DIAGNOSTICS
/* Fatal error: no permission to change privilege level.
/* SEE ALSO
/* dot_lockfile(3) dotlock file management
/* set_eugid(3) switch effective rights
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/* System library. */
#include <sys_defs.h>
#include <unistd.h>
/* Utility library. */
#include "msg.h"
#include "set_eugid.h"
#include "dot_lockfile.h"
#include "dot_lockfile_as.h"
/* dot_lockfile_as - dotlock file as user */
int dot_lockfile_as(const char *path, VSTRING *why, uid_t euid, gid_t egid)
{
uid_t saved_euid = geteuid();
gid_t saved_egid = getegid();
int result;
/*
* Switch to the target user privileges.
*/
set_eugid(euid, egid);
/*
* Lock that file.
*/
result = dot_lockfile(path, why);
/*
* Restore saved privileges.
*/
set_eugid(saved_euid, saved_egid);
return (result);
}
/* dot_unlockfile_as - dotlock file as user */
void dot_unlockfile_as(const char *path, uid_t euid, gid_t egid)
{
uid_t saved_euid = geteuid();
gid_t saved_egid = getegid();
/*
* Switch to the target user privileges.
*/
set_eugid(euid, egid);
/*
* Lock that file.
*/
dot_unlockfile(path);
/*
* Restore saved privileges.
*/
set_eugid(saved_euid, saved_egid);
}
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