Vendor import of OpenSSH.

1 files changed, 107 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..a9195f0
--- /dev/null
+++ b/crypto/openssh/auth-rh-rsa.c
@@ -0,0 +1,107 @@
+/*
+ * 
+ * auth-rh-rsa.c
+ * 
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * 
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ *                    All rights reserved
+ * 
+ * Created: Sun May  7 03:08:06 1995 ylo
+ * 
+ * Rhosts or /etc/hosts.equiv authentication combined with RSA host
+ * authentication.
+ *
+ */
+
+#include "includes.h"
+RCSID("$Id: auth-rh-rsa.c,v 1.10 1999/11/24 19:53:43 markus Exp $");
+
+#include "packet.h"
+#include "ssh.h"
+#include "xmalloc.h"
+#include "uidswap.h"
+#include "servconf.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,
+		BIGNUM *client_host_key_e, BIGNUM *client_host_key_n)
+{
+	extern ServerOptions options;
+	const char *canonical_hostname;
+	HostStatus host_status;
+	BIGNUM *ke, *kn;
+
+	debug("Trying rhosts with RSA host authentication for %.100s", client_user);
+
+	/* 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);
+
+	/* Check if we know the host and its host key. */
+	ke = BN_new();
+	kn = BN_new();
+	host_status = check_host_in_hostfile(SSH_SYSTEM_HOSTFILE, canonical_hostname,
+			   		     client_host_key_e, client_host_key_n,
+					     ke, kn);
+
+	/* 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_host_key_e, client_host_key_n,
+							     ke, kn);
+			restore_uid();
+		}
+		xfree(user_hostfile);
+	}
+	BN_free(ke);
+	BN_free(kn);
+
+	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_e, client_host_key_n)) {
+		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;
+}