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authorDamien Miller <djm@mindrot.org>1999-10-27 13:42:43 +1000
committerDamien Miller <djm@mindrot.org>1999-10-27 13:42:43 +1000
commitd4a8b7e34dd619a4debf9a206c81db26d1402ea6 (patch)
treea47d770a2f790f40d18b0982d4e55fa7cfb1fa3b /auth-rh-rsa.c
Initial revision
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diff --git a/auth-rh-rsa.c b/auth-rh-rsa.c
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+/*
+
+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 1.1 1999/10/27 03:42:43 damien Exp $");
+
+#include "packet.h"
+#include "ssh.h"
+#include "xmalloc.h"
+#include "uidswap.h"
+
+/* Tries to authenticate the user using the .rhosts file and the host using
+ its host key. Returns true if authentication succeeds.
+ .rhosts and .shosts will be ignored if ignore_rhosts is non-zero. */
+
+int auth_rhosts_rsa(struct passwd *pw, const char *client_user,
+ unsigned int client_host_key_bits,
+ BIGNUM *client_host_key_e, BIGNUM *client_host_key_n,
+ int ignore_rhosts, int strict_modes)
+{
+ 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, ignore_rhosts, strict_modes))
+ 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. */
+ /* Check system-wide host file. */
+ ke = BN_new();
+ kn = BN_new();
+ host_status = check_host_in_hostfile(SSH_SYSTEM_HOSTFILE, canonical_hostname,
+ client_host_key_bits, client_host_key_e,
+ client_host_key_n, ke, kn);
+ BN_free(ke);
+ BN_free(kn);
+ if (host_status != HOST_OK) {
+ /* The host key was not found. */
+ 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_bits,
+ 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. */
+
+ log("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;
+}