From 88e486d58fd7f8086bf6b7a9b3cf0127671edb33 Mon Sep 17 00:00:00 2001
From: mdw <mdw>
Date: Thu, 7 Aug 1997 16:28:59 +0000
Subject: [PATCH] Do something useful when users attempt to become themselves.

---
 src/become.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/src/become.c b/src/become.c
index 627eda5..a690072 100644
--- a/src/become.c
+++ b/src/become.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: become.c,v 1.2 1997/08/04 10:24:20 mdw Exp $
+ * $Id: become.c,v 1.3 1997/08/07 16:28:59 mdw Exp $
  *
  * Main code for `become'
  *
@@ -29,6 +29,9 @@
 /*----- Revision history --------------------------------------------------*
  *
  * $Log: become.c,v $
+ * Revision 1.3  1997/08/07 16:28:59  mdw
+ * Do something useful when users attempt to become themselves.
+ *
  * Revision 1.2  1997/08/04 10:24:20  mdw
  * Sources placed under CVS control.
  *
@@ -708,9 +711,20 @@ int main(int argc, char *argv[])
   }
   T( trace(TRACE_SETUP, "setup: canonify binary to `%s'", rq.cmd); )
 
-  /* --- Run the check --- */
+  /* --- Run the check --- *
+   *
+   * If the user is already what she wants to be, then print a warning.
+   * Then, if I was just going to spawn a shell, quit, to reduce user
+   * confusion.  Otherwise, do what was wanted anyway.
+   */
 
-  {
+  if (rq.from == rq.to) {
+    moan("you already are `%s'!", to_pw->pw_name);
+    if (!cmd && todo == shell) {
+      moan("(to prevent confusion, I'm not spawning a shell)");
+      exit(0);
+    }
+  } else {
     int a = check(&rq);
 
     syslog(LOG_INFO,
@@ -730,7 +744,7 @@ int main(int argc, char *argv[])
     puts("permission granted");
     return (0);
   } else {
-    if (setuid(rq.to) == -1 || seteuid(rq.to) == -1)
+    if (setuid(rq.to) == -1)
       die("couldn't set uid: %s", strerror(errno));
     execve(rq.cmd, todo, env);
     die("couldn't exec `%s': %s", rq.cmd, strerror(errno));
-- 
2.11.0