1 files changed, 114 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..a9dd117
--- /dev/null
+++ b/crypto/openssh/auth-rh-rsa.c
@@ -0,0 +1,114 @@
+/*
+ * 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"
+RCSID("$OpenBSD: auth-rh-rsa.c,v 1.17 2000/10/03 18:03:03 markus Exp $");
+RCSID("$FreeBSD$");
+
+#include "packet.h"
+#include "ssh.h"
+#include "xmalloc.h"
+#include "uidswap.h"
+#include "servconf.h"
+
+#include <openssl/rsa.h>
+#include <openssl/dsa.h>
+#include "key.h"
+#include "hostfile.h"
+
+/*
+ * 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(struct passwd *pw, const char *client_user, RSA *client_host_key)
+{
+	extern ServerOptions options;
+	const char *canonical_hostname;
+	HostStatus host_status;
+	Key *client_key, *found;
+
+	debug("Trying rhosts with RSA host authentication for client user %.100s", client_user);
+
+	if (pw == NULL || client_host_key == NULL)
+		return 0;
+
+	/* Check if we would accept it using rhosts authentication. */
+	if (!auth_rhosts(pw, client_user))
+		return 0;
+
+	canonical_hostname = get_canonical_hostname();
+
+	debug("Rhosts RSA authentication: canonical host %.900s", canonical_hostname);
+
+	/* wrap the RSA key into a 'generic' key */
+	client_key = key_new(KEY_RSA);
+	BN_copy(client_key->rsa->e, client_host_key->e);
+	BN_copy(client_key->rsa->n, client_host_key->n);
+	found = key_new(KEY_RSA);
+
+	/* Check if we know the host and its host key. */
+	host_status = check_host_in_hostfile(SSH_SYSTEM_HOSTFILE, canonical_hostname,
+	    client_key, found);
+
+	/* Check user host file unless ignored. */
+	if (host_status != HOST_OK && !options.ignore_user_known_hosts) {
+		struct stat st;
+		char *user_hostfile = tilde_expand_filename(SSH_USER_HOSTFILE, pw->pw_uid);
+		/*
+		 * Check file permissions of SSH_USER_HOSTFILE, auth_rsa()
+		 * did already check pw->pw_dir, but there is a race XXX
+		 */
+		if (options.strict_modes &&
+		    (stat(user_hostfile, &st) == 0) &&
+		    ((st.st_uid != 0 && st.st_uid != pw->pw_uid) ||
+		     (st.st_mode & 022) != 0)) {
+			log("Rhosts RSA authentication refused for %.100s: bad owner or modes for %.200s",
+			    pw->pw_name, user_hostfile);
+		} else {
+			/* XXX race between stat and the following open() */
+			temporarily_use_uid(pw->pw_uid);
+			host_status = check_host_in_hostfile(user_hostfile, canonical_hostname,
+			    client_key, found);
+			restore_uid();
+		}
+		xfree(user_hostfile);
+	}
+	key_free(client_key);
+	key_free(found);
+
+	if (host_status != HOST_OK) {
+		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)) {
+		log("Client on %.800s failed to respond correctly to host authentication.",
+		    canonical_hostname);
+		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, client_user, canonical_hostname);
+	packet_send_debug("Rhosts with RSA host authentication accepted.");
+	return 1;
+}