Put ssh back into the repository
Change-Id: I23324372188fa6ed3f93a32b84365f5df6367590
diff --git a/auth-rh-rsa.c b/auth-rh-rsa.c
new file mode 100644
index 0000000..b21a0f4
--- /dev/null
+++ b/auth-rh-rsa.c
@@ -0,0 +1,103 @@
+/* $OpenBSD: auth-rh-rsa.c,v 1.43 2010/03/04 10:36:03 djm 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;
+
+ if (auth_key_is_revoked(client_host_key))
+ return 0;
+
+ /* 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;
+}