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Ottre
n00b
n00b


Joined: 23 Dec 2012
Posts: 33

PostPosted: Thu Jan 17, 2013 11:01 am    Post subject: Customising the pre-login prompt Reply with quote

I wasn't happy with the "<hostname> login: " pre-login prompt.

I wanted "Username: " instead so I patched the packages that provide the prompt:

1) sys-apps/shadow. /bin/login belongs to this package and provides the secondary prompt, and an error message, if you enter your password wrong.

Code:

--- shadow-4.1.4.3/src/login.c
+++ shadow-4.1.4.3/src/login.c
@@ -742,17 +742,17 @@
       char hostn[256];
       char loginprompt[256];   /* That's one hell of a prompt :) */
 
-      /* Make the login prompt look like we want it */
-      if (gethostname (hostn, sizeof (hostn)) == 0) {
-         snprintf (loginprompt,
-                   sizeof (loginprompt),
-                   _("%s login: "), hostn);
-      } else {
-         strncpy (loginprompt, _("login: "),
-                  sizeof (loginprompt));
-      }
-
-      retcode = pam_set_item (pamh, PAM_USER_PROMPT, loginprompt);
+      /* Make the login prompt look like we want it
+       * if (gethostname (hostn, sizeof (hostn)) == 0) {
+       *    snprintf (loginprompt,
+       *              sizeof (loginprompt),
+       *              _("%s login: "), hostn);
+       * } else {
+       *    strncpy (loginprompt, _("login: "),
+       *             sizeof (loginprompt));
+       * }
+                 */
+      retcode = pam_set_item (pamh, PAM_USER_PROMPT, "Try again. Username: ");
       PAM_FAIL_CHECK;
 
       /* if we didn't get a user on the command line,
@@ -829,8 +829,9 @@
          close (audit_fd);
 #endif            /* WITH_AUDIT */
 
-         (void) puts ("");
-         (void) puts (_("Login incorrect"));
+         /* (void) puts ("");
+          * (void) puts (_("Login incorrect"));
+          */
 
          if (failcount >= retries) {
             SYSLOG ((LOG_NOTICE,


2) sys-apps/util-linux. /sbin/agetty belongs to this package and provides the main prompt.
Code:

--- util-linux-2.21.2/term-utils/agetty.c
+++ util-linux-2.21.2/term-utils/agetty.c
@@ -99,7 +99,7 @@
 #endif
 
 /* Login prompt. */
-#define LOGIN      "login: "
+#define LOGIN      "Username: "
 #define LOGIN_ARGV_MAX   16      /* Numbers of args for login */
 
 /* Some shorthands for control characters. */


I copied the packages to my local overlay, re-emerged them, and everything works fine.

However, I was wondering if there is an easier way of customising the pre-login prompt, without patching anything?

After googling a bit for answers, these are possible solutions:

1) I use PAM. Is it possible to have the pam_issue module override the /bin/login secondary prompt?

2) Is there an alternative to agetty that lets me set the main prompt in the /etc/inittab file?

Any help would be much appreciated.
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