packetstorm sync

1 files changed, 112 insertions, 0 deletions

diff --git a/other/ssharp/auth2-chall.c b/other/ssharp/auth2-chall.c
new file mode 100644
index 0000000..5af60e4
--- /dev/null
+++ b/other/ssharp/auth2-chall.c
@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2001 Markus Friedl.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include "includes.h"
+RCSID("$OpenBSD: auth2-chall.c,v 1.4 2001/03/28 22:43:31 markus Exp $");
+
+#include "ssh2.h"
+#include "auth.h"
+#include "packet.h"
+#include "xmalloc.h"
+#include "dispatch.h"
+#include "log.h"
+
+void send_userauth_into_request(Authctxt *authctxt, char *challenge, int echo);
+void input_userauth_info_response(int type, int plen, void *ctxt);
+
+/*
+ * try challenge-reponse, return -1 (= postponed) if we have to
+ * wait for the response.
+ */
+int
+auth2_challenge(Authctxt *authctxt, char *devs)
+{
+        char *challenge;
+
+        if (!authctxt->valid || authctxt->user == NULL)
+                return 0;
+        if ((challenge = get_challenge(authctxt, devs)) == NULL)
+                return 0;
+        send_userauth_into_request(authctxt, challenge, 0);
+        dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE,
+            &input_userauth_info_response);
+        authctxt->postponed = 1;
+        return 0;
+}
+
+void
+send_userauth_into_request(Authctxt *authctxt, char *challenge, int echo)
+{
+        int nprompts = 1;
+
+        packet_start(SSH2_MSG_USERAUTH_INFO_REQUEST);
+        /* name, instruction and language are unused */
+        packet_put_cstring("");
+        packet_put_cstring("");
+        packet_put_cstring("");
+        packet_put_int(nprompts);
+        packet_put_cstring(challenge);
+        packet_put_char(echo);
+        packet_send();
+        packet_write_wait();
+}
+
+void
+input_userauth_info_response(int type, int plen, void *ctxt)
+{
+        Authctxt *authctxt = ctxt;
+        int authenticated = 0;
+        u_int nresp, rlen;
+        char *response, *method = "challenge-reponse";
+
+        if (authctxt == NULL)
+                fatal("input_userauth_info_response: no authctxt");
+
+        authctxt->postponed = 0;        /* reset */
+        nresp = packet_get_int();
+        if (nresp == 1) {
+                response = packet_get_string(&rlen);
+                packet_done();
+                if (strlen(response) == 0) {
+                        /*
+                         * if we received an empty response, resend challenge
+                         * with echo enabled
+                         */
+                        char *challenge = get_challenge(authctxt, NULL);
+                        if (challenge != NULL) {
+                                send_userauth_into_request(authctxt,
+                                    challenge, 1);
+                                authctxt->postponed = 1;
+                        }
+                } else if (authctxt->valid) {
+                        authenticated = verify_response(authctxt, response);
+                        memset(response, 'r', rlen);
+                }
+                xfree(response);
+        }
+        /* unregister callback */
+        if (!authctxt->postponed)
+                dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, NULL);
+
+        userauth_finish(authctxt, authenticated, method);
+}