Put ssh back into the repository
Change-Id: I23324372188fa6ed3f93a32b84365f5df6367590
diff --git a/auth-chall.c b/auth-chall.c
new file mode 100644
index 0000000..919b1ea
--- /dev/null
+++ b/auth-chall.c
@@ -0,0 +1,123 @@
+/* $OpenBSD: auth-chall.c,v 1.12 2006/08/03 03:34:41 deraadt Exp $ */
+/*
+ * 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"
+
+#include <sys/types.h>
+
+#include <stdarg.h>
+
+#include "xmalloc.h"
+#include "key.h"
+#include "hostfile.h"
+#include "auth.h"
+#include "log.h"
+#include "servconf.h"
+
+/* limited protocol v1 interface to kbd-interactive authentication */
+
+extern KbdintDevice *devices[];
+static KbdintDevice *device;
+extern ServerOptions options;
+
+char *
+get_challenge(Authctxt *authctxt)
+{
+ char *challenge, *name, *info, **prompts;
+ u_int i, numprompts;
+ u_int *echo_on;
+
+#ifdef USE_PAM
+ if (!options.use_pam)
+ remove_kbdint_device("pam");
+#endif
+
+ device = devices[0]; /* we always use the 1st device for protocol 1 */
+ if (device == NULL)
+ return NULL;
+ if ((authctxt->kbdintctxt = device->init_ctx(authctxt)) == NULL)
+ return NULL;
+ if (device->query(authctxt->kbdintctxt, &name, &info,
+ &numprompts, &prompts, &echo_on)) {
+ device->free_ctx(authctxt->kbdintctxt);
+ authctxt->kbdintctxt = NULL;
+ return NULL;
+ }
+ if (numprompts < 1)
+ fatal("get_challenge: numprompts < 1");
+ challenge = xstrdup(prompts[0]);
+ for (i = 0; i < numprompts; i++)
+ xfree(prompts[i]);
+ xfree(prompts);
+ xfree(name);
+ xfree(echo_on);
+ xfree(info);
+
+ return (challenge);
+}
+int
+verify_response(Authctxt *authctxt, const char *response)
+{
+ char *resp[1], *name, *info, **prompts;
+ u_int i, numprompts, *echo_on;
+ int authenticated = 0;
+
+ if (device == NULL)
+ return 0;
+ if (authctxt->kbdintctxt == NULL)
+ return 0;
+ resp[0] = (char *)response;
+ switch (device->respond(authctxt->kbdintctxt, 1, resp)) {
+ case 0: /* Success */
+ authenticated = 1;
+ break;
+ case 1: /* Postponed - retry with empty query for PAM */
+ if ((device->query(authctxt->kbdintctxt, &name, &info,
+ &numprompts, &prompts, &echo_on)) != 0)
+ break;
+ if (numprompts == 0 &&
+ device->respond(authctxt->kbdintctxt, 0, resp) == 0)
+ authenticated = 1;
+
+ for (i = 0; i < numprompts; i++)
+ xfree(prompts[i]);
+ xfree(prompts);
+ xfree(name);
+ xfree(echo_on);
+ xfree(info);
+ break;
+ }
+ device->free_ctx(authctxt->kbdintctxt);
+ authctxt->kbdintctxt = NULL;
+ return authenticated;
+}
+void
+abandon_challenge_response(Authctxt *authctxt)
+{
+ if (authctxt->kbdintctxt != NULL) {
+ device->free_ctx(authctxt->kbdintctxt);
+ authctxt->kbdintctxt = NULL;
+ }
+}