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