1 files changed, 13 insertions, 0 deletions
diff --git a/src/openvpn/console.c b/src/openvpn/console.c
index d66d408..e1d46c4 100644
--- a/src/openvpn/console.c
+++ b/src/openvpn/console.c
@@ -208,6 +208,19 @@ get_console_input (const char *prompt, const bool echo, char *input, const int c
 #if defined(WIN32)
   return get_console_input_win32 (prompt, echo, input, capacity);
 #elif defined(HAVE_GETPASS)
+
+  /* did we --daemon'ize before asking for passwords?
+   * (in which case neither stdin or stderr are connected to a tty and
+   * /dev/tty can not be open()ed anymore)
+   */
+  if ( !isatty(0) && !isatty(2) )
+    {
+      int fd = open( "/dev/tty", O_RDWR );
+      if ( fd < 0 )
+	{ msg(M_FATAL, "neither stdin nor stderr are a tty device and you have neither a controlling tty nor systemd - can't ask for '%s'.  If you used --daemon, you need to use --askpass to make passphrase-protected keys work, and you can not use --auth-nocache.", prompt ); }
+      close(fd);
+    }
+
   if (echo)
     {
       FILE *fp;