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-rw-r--r--src/util/lstat_as.c73
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diff --git a/src/util/lstat_as.c b/src/util/lstat_as.c
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+/*++
+/* NAME
+/* lstat_as 3
+/* SUMMARY
+/* lstat file as user
+/* SYNOPSIS
+/* #include <sys/stat.h>
+/* #include <lstat_as.h>
+/*
+/* int lstat_as(path, st, euid, egid)
+/* const char *path;
+/* struct stat *st;
+/* uid_t euid;
+/* gid_t egid;
+/* DESCRIPTION
+/* lstat_as() looks up the file status of the named \fIpath\fR,
+/* using the effective rights specified by \fIeuid\fR
+/* and \fIegid\fR, and stores the result into the structure pointed
+/* to by \fIst\fR. A -1 result means the lookup failed.
+/* This call does not follow symbolic links.
+/* DIAGNOSTICS
+/* Fatal error: no permission to change privilege level.
+/* SEE ALSO
+/* 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 <sys/stat.h>
+#include <unistd.h>
+
+/* Utility library. */
+
+#include "msg.h"
+#include "set_eugid.h"
+#include "lstat_as.h"
+#include "warn_stat.h"
+
+/* lstat_as - lstat file as user */
+
+int lstat_as(const char *path, struct stat * st, uid_t euid, gid_t egid)
+{
+ uid_t saved_euid = geteuid();
+ gid_t saved_egid = getegid();
+ int status;
+
+ /*
+ * Switch to the target user privileges.
+ */
+ set_eugid(euid, egid);
+
+ /*
+ * Lstat that file.
+ */
+ status = lstat(path, st);
+
+ /*
+ * Restore saved privileges.
+ */
+ set_eugid(saved_euid, saved_egid);
+
+ return (status);
+}