1 files changed, 115 insertions, 0 deletions

diff --git a/other/openssh-2.1.1p4/auth-rh-rsa.c b/other/openssh-2.1.1p4/auth-rh-rsa.c
new file mode 100644
index 0000000..4386758
--- /dev/null
+++ b/other/openssh-2.1.1p4/auth-rh-rsa.c
@@ -0,0 +1,115 @@
+/*
+ *
+ * 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("$OpenBSD: auth-rh-rsa.c,v 1.14 2000/06/20 01:39:38 markus Exp $");
+
+#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 %.100s", client_user);
+
+        if (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;
+}