Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 73 insertions, 0 deletions

diff --git a/src/util/lstat_as.c b/src/util/lstat_as.c
new file mode 100644
index 0000000..18e0f9f
--- /dev/null
+++ b/src/util/lstat_as.c
@@ -0,0 +1,73 @@
+/*++
+/* 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);
+}