1 files changed, 101 insertions, 0 deletions
diff --git a/contrib/sendmail/test/t_setuid.c b/contrib/sendmail/test/t_setuid.c
new file mode 100644
index 0000000..7487579
--- /dev/null
+++ b/contrib/sendmail/test/t_setuid.c
@@ -0,0 +1,101 @@
+/*
+**  This program checks to see if your version of setuid works.
+**  Compile it, make it setuid root, and run it as yourself (NOT as
+**  root).
+**
+**	NOTE:  This should work everywhere, but Linux has the ability
+**	to use the undocumented setcap() call to make this break.
+**
+**  Compilation is trivial -- just "cc t_setuid.c".  Make it setuid,
+**  root and then execute it as a non-root user.
+*/
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+
+#ifndef lint
+static char id[] = "@(#)$Id: t_setuid.c,v 8.2.2.1 2000/05/31 00:29:47 gshapiro Exp $";
+#endif /* ! lint */
+
+static void
+printuids(str, r, e)
+	char *str;
+	int r, e;
+{
+	printf("%s (should be %d/%d): r/euid=%d/%d\n", str, r, e,
+		getuid(), geteuid());
+}
+
+int
+main(argc, argv)
+	int argc;
+	char **argv;
+{
+	int fail = 0;
+	uid_t realuid = getuid();
+
+	printuids("initial uids", realuid, 0);
+
+	if (geteuid() != 0)
+	{
+		printf("SETUP ERROR: re-run setuid root\n");
+		exit(1);
+	}
+
+	if (getuid() == 0)
+	{
+		printf("SETUP ERROR: must be run by a non-root user\n");
+		exit(1);
+	}
+
+	if (setuid(1) < 0)
+		printf("setuid(1) failure\n");
+	printuids("after setuid(1)", 1, 1);
+
+	if (geteuid() != 1)
+	{
+		fail++;
+		printf("MAYDAY!  Wrong effective uid\n");
+	}
+
+	if (getuid() != 1)
+	{
+		fail++;
+		printf("MAYDAY!  Wrong real uid\n");
+	}
+
+
+	/* do activity here */
+	if (setuid(0) == 0)
+	{
+		fail++;
+		printf("MAYDAY!  setuid(0) succeeded (should have failed)\n");
+	}
+	else
+	{
+		printf("setuid(0) failed (this is correct)\n");
+	}
+	printuids("after setuid(0)", 1, 1);
+
+	if (geteuid() != 1)
+	{
+		fail++;
+		printf("MAYDAY!  Wrong effective uid\n");
+	}
+	if (getuid() != 1)
+	{
+		fail++;
+		printf("MAYDAY!  Wrong real uid\n");
+	}
+	printf("\n");
+
+	if (fail)
+	{
+		printf("\nThis system cannot use setuid (maybe use setreuid)\n");
+		exit(1);
+	}
+
+	printf("\nIt is safe to use setuid on this system\n");
+	exit(0);
+}