Added at/atrm/atq/batch from Linux as hacked by Chris Demetriou.

1 files changed, 92 insertions, 0 deletions

diff --git a/usr.bin/at/privs.h b/usr.bin/at/privs.h
new file mode 100644
index 0000000..e1ad1b4
--- /dev/null
+++ b/usr.bin/at/privs.h
@@ -0,0 +1,92 @@
+/*
+ * privs.h - header for privileged operations
+ * Copyright (c) 1993 by Thomas Koenig
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. The name of the author(s) may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *	$Id: privs.h,v 1.1 1993/12/05 11:37:29 cgd Exp $
+ */
+
+#ifndef _PRIVS_H
+#define _PRIVS_H
+
+#include <unistd.h>
+
+/* Relinquish privileges temporarily for a setuid program
+ * with the option of getting them back later.  This is done by swapping
+ * the real and effective userid BSD style.  Call RELINQUISH_PRIVS once
+ * at the beginning of the main program.  This will cause all operatons
+ * to be executed with the real userid.  When you need the privileges
+ * of the setuid invocation, call PRIV_START; when you no longer
+ * need it, call PRIV_END.  Note that it is an error to call PRIV_START
+ * and not PRIV_END within the same function.
+ *
+ * Use RELINQUISH_PRIVS_ROOT(a) if your program started out running
+ * as root, and you want to drop back the effective userid to a
+ * and the effective group id to b, with the option to get them back
+ * later.
+ *
+ * If you no longer need root privileges, but those of some other
+ * userid/groupid, you can call REDUCE_PRIV(a) when your effective
+ * is the user's.
+ *
+ * Problems: Do not use return between PRIV_START and PRIV_END; this
+ * will cause the program to continue running in an unprivileged
+ * state.
+ *
+ * It is NOT safe to call exec(), system() or popen() with a user-
+ * supplied program (i.e. without carefully checking PATH and any
+ * library load paths) with relinquished privileges; the called program
+ * can aquire them just as easily.  Set both effective and real userid
+ * to the real userid before calling any of them.
+ */
+
+#ifndef MAIN
+extern
+#endif
+uid_t real_uid, effective_uid;
+
+#define RELINQUISH_PRIVS { \
+	real_uid = getuid(); \
+	effective_uid = geteuid(); \
+	setreuid(effective_uid,real_uid); \
+}
+
+#define RELINQUISH_PRIVS_ROOT(a) { \
+	real_uid = (a); \
+	effective_uid = geteuid(); \
+	setreuid(effective_uid,real_uid); \
+}
+
+#define PRIV_START { \
+	setreuid(real_uid,effective_uid);
+
+#define PRIV_END \
+	setreuid(effective_uid,real_uid); \
+}
+
+#define REDUCE_PRIV(a) { \
+	setreuid(real_uid,effective_uid); \
+	effective_uid = (a); \
+	setreuid(effective_uid,real_uid); \
+}
+#endif