/*
-
-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.
-
-*/
+ *
+ * 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("$Id$");
#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.
- .rhosts and .shosts will be ignored if ignore_rhosts is non-zero. */
+ its host key. Returns true if authentication succeeds. */
-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)
+int
+auth_rhosts_rsa(struct passwd *pw, const char *client_user,
+ BIGNUM *client_host_key_e, BIGNUM *client_host_key_n)
{
- 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);
- /* Check user host file. */
- if (host_status != HOST_OK) {
- 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 (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_bits, 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) {
- /* 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;
+ 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;
}
andersk / openssh.git / blobdiff