X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/3548428432d86d072333b369df2f3622b653b4c4..59f552b7e5a01420c77880d207ff06686165e4db:/auth-rh-rsa.c

diff --git a/auth-rh-rsa.c b/auth-rh-rsa.c
index 52ce688c..2eb7e6e2 100644
--- a/auth-rh-rsa.c
+++ b/auth-rh-rsa.c
@@ -1,96 +1,72 @@
 /*
- *
- * 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.
  *
+ * 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("$Id$");
+RCSID("$OpenBSD: auth-rh-rsa.c,v 1.36 2003/06/02 09:17:34 markus Exp $");
 
 #include "packet.h"
-#include "ssh.h"
-#include "xmalloc.h"
 #include "uidswap.h"
+#include "log.h"
 #include "servconf.h"
-
-#include <openssl/rsa.h>
-#include <openssl/dsa.h>
 #include "key.h"
 #include "hostfile.h"
+#include "pathnames.h"
+#include "auth.h"
+#include "canohost.h"
 
-/*
- * Tries to authenticate the user using the .rhosts file and the host using
- * its host key.  Returns true if authentication succeeds.
- */
+#include "monitor_wrap.h"
+
+/* import */
+extern ServerOptions options;
 
 int
-auth_rhosts_rsa(struct passwd *pw, const char *client_user, RSA *client_host_key)
+auth_rhosts_rsa_key_allowed(struct passwd *pw, char *cuser, char *chost,
+    Key *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))
+	if (!auth_rhosts(pw, cuser))
 		return 0;
 
-	canonical_hostname = get_canonical_hostname();
+	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);
+}
 
-	debug("Rhosts RSA authentication: canonical host %.900s", canonical_hostname);
+/*
+ * 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, char *cuser, Key *client_host_key)
+{
+	char *chost;
 
-	/* 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);
+	debug("Trying rhosts with RSA host authentication for client user %.100s",
+	    cuser);
 
-	/* Check if we know the host and its host key. */
-	host_status = check_host_in_hostfile(SSH_SYSTEM_HOSTFILE, canonical_hostname,
-	    client_key, found);
+	if (pw == NULL || client_host_key == NULL ||
+	    client_host_key->rsa == NULL)
+		return 0;
 
-	/* 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);
+	chost = (char *)get_canonical_hostname(options.use_dns);
+	debug("Rhosts RSA authentication: canonical host %.900s", chost);
 
-	if (host_status != HOST_OK) {
+	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;
@@ -99,8 +75,8 @@ auth_rhosts_rsa(struct passwd *pw, const char *client_user, RSA *client_host_key
 
 	/* 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);
+		logit("Client on %.800s failed to respond correctly to host authentication.",
+		    chost);
 		return 0;
 	}
 	/*
@@ -109,7 +85,7 @@ auth_rhosts_rsa(struct passwd *pw, const char *client_user, RSA *client_host_key
 	 */
 
 	verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
-	   pw->pw_name, client_user, canonical_hostname);
+	   pw->pw_name, cuser, chost);
 	packet_send_debug("Rhosts with RSA host authentication accepted.");
 	return 1;
 }