*/
#include "includes.h"
-RCSID("$OpenBSD: auth-rh-rsa.c,v 1.18 2000/11/12 19:50:37 markus Exp $");
+RCSID("$OpenBSD: auth-rh-rsa.c,v 1.37 2003/11/04 08:54:09 djm 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 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))
+ 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);
- debug("Rhosts RSA authentication: canonical host %.900s", canonical_hostname);
+ return (host_status == HOST_OK);
+}
- /* wrap the RSA key into a 'generic' key */
- client_key = key_new(KEY_RSA1);
- BN_copy(client_key->rsa->e, client_host_key->e);
- BN_copy(client_key->rsa->n, client_host_key->n);
- found = key_new(KEY_RSA1);
+/*
+ * 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(Authctxt *authctxt, char *cuser, Key *client_host_key)
+{
+ char *chost;
+ struct passwd *pw = authctxt->pw;
- /* Check if we know the host and its host key. */
- host_status = check_host_in_hostfile(SSH_SYSTEM_HOSTFILE, canonical_hostname,
- client_key, found);
+ debug("Trying rhosts with RSA host authentication for client user %.100s",
+ cuser);
- /* 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 (!authctxt->valid || client_host_key == NULL ||
+ client_host_key->rsa == NULL)
+ return 0;
+
+ 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;
/* 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;
}
/*
*/
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;
}