openssh/openssh-5.1p1-skip-initial.patch

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Skip the initial empty-password check if permit_empty_passwd is disabled. This
doesn't change the timing profiles of the host because the additional condition
check which can short-circuit the call to pam_authenticate() has no dependency
on the identity of the user who is being authenticated.
diff -up openssh-5.1p1/auth1.c.skip-initial openssh-5.1p1/auth1.c
--- openssh-5.1p1/auth1.c.skip-initial 2008-07-09 12:54:05.000000000 +0200
+++ openssh-5.1p1/auth1.c 2008-07-23 18:26:01.000000000 +0200
@@ -244,7 +244,7 @@ do_authloop(Authctxt *authctxt)
authctxt->valid ? "" : "invalid user ", authctxt->user);
/* If the user has no password, accept authentication immediately. */
- if (options.password_authentication &&
+ if (options.permit_empty_passwd && options.password_authentication &&
#ifdef KRB5
(!options.kerberos_authentication || options.kerberos_or_local_passwd) &&
#endif
diff -up openssh-5.1p1/auth2-none.c.skip-initial openssh-5.1p1/auth2-none.c
--- openssh-5.1p1/auth2-none.c.skip-initial 2008-07-02 14:56:09.000000000 +0200
+++ openssh-5.1p1/auth2-none.c 2008-07-23 18:26:01.000000000 +0200
@@ -65,7 +65,7 @@ userauth_none(Authctxt *authctxt)
if (check_nt_auth(1, authctxt->pw) == 0)
return (0);
#endif
- if (options.password_authentication)
+ if (options.permit_empty_passwd && options.password_authentication)
return (PRIVSEP(auth_password(authctxt, "")));
return (0);
}