restrict monitor auth calls to be allowed only when their

respective authentication methods are enabled in the configuration.

prompted by Solar Designer; ok markus dtucker

diff --git a/usr.bin/ssh/monitor.c b/usr.bin/ssh/monitor.c
index f253d0a..0701b4c 100644 (file)
--- a/usr.bin/ssh/monitor.c
+++ b/usr.bin/ssh/monitor.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: monitor.c,v 1.163 2016/08/19 03:18:06 djm Exp $ */
+/* $OpenBSD: monitor.c,v 1.164 2016/08/30 07:50:21 djm Exp $ */
 /*
  * Copyright 2002 Niels Provos <provos@citi.umich.edu>
  * Copyright 2002 Markus Friedl <markus@openbsd.org>
@@ -759,6 +759,8 @@ mm_answer_authpassword(int sock, Buffer *m)
        int authenticated;
        u_int plen;
 
+       if (!options.password_authentication)
+               fatal("%s: password authentication not enabled", __func__);
        passwd = buffer_get_string(m, &plen);
        /* Only authenticate if the context is valid */
        authenticated = options.password_authentication &&
@@ -791,6 +793,8 @@ mm_answer_bsdauthquery(int sock, Buffer *m)
        char **prompts;
        u_int success;
 
+       if (!options.kbd_interactive_authentication)
+               fatal("%s: kbd-int authentication not enabled", __func__);
        success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
            &prompts, &echo_on) < 0 ? 0 : 1;
 
@@ -818,6 +822,8 @@ mm_answer_bsdauthrespond(int sock, Buffer *m)
        char *response;
        int authok;
 
+       if (!options.kbd_interactive_authentication)
+               fatal("%s: kbd-int authentication not enabled", __func__);
        if (authctxt->as == NULL)
                fatal("%s: no bsd auth session", __func__);
 
@@ -1380,6 +1386,9 @@ mm_answer_gss_setup_ctx(int sock, Buffer *m)
        OM_uint32 major;
        u_int len;
 
+       if (!options.gss_authentication)
+               fatal("%s: GSSAPI authentication not enabled", __func__);
+
        goid.elements = buffer_get_string(m, &len);
        goid.length = len;
 
@@ -1407,6 +1416,9 @@ mm_answer_gss_accept_ctx(int sock, Buffer *m)
        OM_uint32 flags = 0; /* GSI needs this */
        u_int len;
 
+       if (!options.gss_authentication)
+               fatal("%s: GSSAPI authentication not enabled", __func__);
+
        in.value = buffer_get_string(m, &len);
        in.length = len;
        major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
@@ -1435,6 +1447,9 @@ mm_answer_gss_checkmic(int sock, Buffer *m)
        OM_uint32 ret;
        u_int len;
 
+       if (!options.gss_authentication)
+               fatal("%s: GSSAPI authentication not enabled", __func__);
+
        gssbuf.value = buffer_get_string(m, &len);
        gssbuf.length = len;
        mic.value = buffer_get_string(m, &len);
@@ -1461,6 +1476,9 @@ mm_answer_gss_userok(int sock, Buffer *m)
 {
        int authenticated;
 
+       if (!options.gss_authentication)
+               fatal("%s: GSSAPI authentication not enabled", __func__);
+
        authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
 
        buffer_clear(m);