1 files changed, 26 insertions, 0 deletions

diff --git a/libbb/securetty.c b/libbb/securetty.c
new file mode 100644
index 000000000..21354e2fa
--- /dev/null
+++ b/libbb/securetty.c
@@ -0,0 +1,26 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * /etc/securetty checking.
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+#include "libbb.h"
+
+#if ENABLE_FEATURE_SECURETTY && !ENABLE_PAM
+int FAST_FUNC is_tty_secure(const char *short_tty)
+{
+        char *buf = (char*)"/etc/securetty"; /* any non-NULL is ok */
+        parser_t *parser = config_open2("/etc/securetty", fopen_for_read);
+        while (config_read(parser, &buf, 1, 1, "# \t", PARSE_NORMAL)) {
+                if (strcmp(buf, short_tty) == 0)
+                        break;
+                buf = NULL;
+        }
+        config_close(parser);
+        /* buf != NULL here if config file was not found, empty
+         * or line was found which equals short_tty.
+         * In all these cases, we report "this tty is secure".
+         */
+        return buf != NULL;
+}
+#endif