1 files changed, 100 insertions, 0 deletions
diff --git a/crypto/openssh/auth-rh-rsa.c b/crypto/openssh/auth-rh-rsa.c
new file mode 100644
index 0000000..eca7502
--- /dev/null
+++ b/crypto/openssh/auth-rh-rsa.c
@@ -0,0 +1,100 @@
+/* $OpenBSD: auth-rh-rsa.c,v 1.42 2006/08/03 03:34:41 deraadt Exp $ */
+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ *                    All rights reserved
+ * Rhosts or /etc/hosts.equiv authentication combined with RSA host
+ * authentication.
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose.  Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ */
+
+#include "includes.h"
+
+#include <sys/types.h>
+
+#include <pwd.h>
+#include <stdarg.h>
+
+#include "packet.h"
+#include "uidswap.h"
+#include "log.h"
+#include "buffer.h"
+#include "servconf.h"
+#include "key.h"
+#include "hostfile.h"
+#include "pathnames.h"
+#include "auth.h"
+#include "canohost.h"
+#ifdef GSSAPI
+#include "ssh-gss.h"
+#endif
+#include "monitor_wrap.h"
+
+/* import */
+extern ServerOptions options;
+
+int
+auth_rhosts_rsa_key_allowed(struct passwd *pw, char *cuser, char *chost,
+    Key *client_host_key)
+{
+	HostStatus host_status;
+
+	/* Check if we would accept it using rhosts authentication. */
+	if (!auth_rhosts(pw, cuser))
+		return 0;
+
+	host_status = check_key_in_hostfiles(pw, client_host_key,
+	    chost, _PATH_SSH_SYSTEM_HOSTFILE,
+	    options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE);
+
+	return (host_status == HOST_OK);
+}
+
+/*
+ * Tries to authenticate the user using the .rhosts file and the host using
+ * its host key.  Returns true if authentication succeeds.
+ */
+int
+auth_rhosts_rsa(Authctxt *authctxt, char *cuser, Key *client_host_key)
+{
+	char *chost;
+	struct passwd *pw = authctxt->pw;
+
+	debug("Trying rhosts with RSA host authentication for client user %.100s",
+	    cuser);
+
+	if (!authctxt->valid || client_host_key == NULL ||
+	    client_host_key->rsa == NULL)
+		return 0;
+
+	chost = (char *)get_canonical_hostname(options.use_dns);
+	debug("Rhosts RSA authentication: canonical host %.900s", chost);
+
+	if (!PRIVSEP(auth_rhosts_rsa_key_allowed(pw, cuser, chost, client_host_key))) {
+		debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
+		packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
+		return 0;
+	}
+	/* A matching host key was found and is known. */
+
+	/* Perform the challenge-response dialog with the client for the host key. */
+	if (!auth_rsa_challenge_dialog(client_host_key)) {
+		logit("Client on %.800s failed to respond correctly to host authentication.",
+		    chost);
+		return 0;
+	}
+	/*
+	 * We have authenticated the user using .rhosts or /etc/hosts.equiv,
+	 * and the host using RSA. We accept the authentication.
+	 */
+
+	verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
+	    pw->pw_name, cuser, chost);
+	packet_send_debug("Rhosts with RSA host authentication accepted.");
+	return 1;
+}