Imported Upstream version 2.3_rc1

1 files changed, 252 insertions, 0 deletions

diff --git a/src/openvpn/ssl_verify.h b/src/openvpn/ssl_verify.h
new file mode 100644
index 0000000..1d20152
--- /dev/null
+++ b/src/openvpn/ssl_verify.h
@@ -0,0 +1,252 @@
+/*
+ *  OpenVPN -- An application to securely tunnel IP networks
+ *             over a single TCP/UDP port, with support for SSL/TLS-based
+ *             session authentication and key exchange,
+ *             packet encryption, packet authentication, and
+ *             packet compression.
+ *
+ *  Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
+ *  Copyright (C) 2010 Fox Crypto B.V. <openvpn@fox-it.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program (see the file COPYING included with this
+ *  distribution); if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/**
+ * @file Control Channel Verification Module
+ */
+
+#ifndef SSL_VERIFY_H_
+#define SSL_VERIFY_H_
+
+#include "syshead.h"
+#include "misc.h"
+#include "manage.h"
+#include "ssl_common.h"
+
+/* Include OpenSSL-specific code */
+#ifdef ENABLE_CRYPTO_OPENSSL
+#include "ssl_verify_openssl.h"
+#endif
+#ifdef ENABLE_CRYPTO_POLARSSL
+#include "ssl_verify_polarssl.h"
+#endif
+
+#include "ssl_verify_backend.h"
+
+/*
+ * Keep track of certificate hashes at various depths
+ */
+
+/** Maximum certificate depth we will allow */
+#define MAX_CERT_DEPTH 16
+
+/** Structure containing the hash for a single certificate */
+struct cert_hash {
+  unsigned char sha1_hash[SHA_DIGEST_LENGTH]; /**< The SHA1 hash for a certificate */
+};
+
+/** Structure containing the hashes for a full certificate chain */
+struct cert_hash_set {
+  struct cert_hash *ch[MAX_CERT_DEPTH]; /**< Array of certificate hashes */
+};
+
+
+#define TLS_AUTHENTICATION_SUCCEEDED  0
+#define TLS_AUTHENTICATION_FAILED     1
+#define TLS_AUTHENTICATION_DEFERRED   2
+#define TLS_AUTHENTICATION_UNDEFINED  3
+
+/*
+ * Return current session authentication state.  Return
+ * value is TLS_AUTHENTICATION_x.
+ *
+ * TODO: document this function
+ */
+int tls_authentication_status (struct tls_multi *multi, const int latency);
+
+/** Check whether the \a ks \c key_state is ready to receive data channel
+ *   packets.
+ *   @ingroup data_crypto
+ *
+ *   If true, it is safe to assume that this session has been authenticated
+ *   by TLS.
+ *
+ *   @note This macro only works if S_SENT_KEY + 1 == S_GOT_KEY. */
+#define DECRYPT_KEY_ENABLED(multi, ks) ((ks)->state >= (S_GOT_KEY - (multi)->opt.server))
+
+/**
+ * Remove the given key state's auth control file, if it exists.
+ *
+ * @param ks	The key state the remove the file for
+ */
+void key_state_rm_auth_control_file (struct key_state *ks);
+
+/**
+ * Frees the given set of certificate hashes.
+ *
+ * @param chs	The certificate hash set to free.
+ */
+void cert_hash_free (struct cert_hash_set *chs);
+
+/**
+ * Locks the certificate hash set used in the given tunnel
+ *
+ * @param multi	The tunnel to lock
+ */
+void tls_lock_cert_hash_set (struct tls_multi *multi);
+
+/**
+ * Locks the common name field for the given tunnel
+ *
+ * @param multi	The tunnel to lock
+ */
+void tls_lock_common_name (struct tls_multi *multi);
+
+/**
+ * Returns the common name field for the given tunnel
+ *
+ * @param multi	The tunnel to return the common name for
+ * @param null	Whether null may be returned. If not, "UNDEF" will be returned.
+ */
+const char *tls_common_name (const struct tls_multi* multi, const bool null);
+
+/**
+ * Returns the username field for the given tunnel
+ *
+ * @param multi	The tunnel to return the username for
+ * @param null	Whether null may be returned. If not, "UNDEF" will be returned.
+ */
+const char *tls_username (const struct tls_multi *multi, const bool null);
+
+#ifdef ENABLE_PF
+
+/**
+ * Retrieve the given tunnel's common name and its hash value.
+ *
+ * @param multi		The tunnel to use
+ * @param cn		Common name's string
+ * @param cn_hash	Common name's hash value
+ *
+ * @return true if the common name was set, false otherwise.
+ */
+static inline bool
+tls_common_name_hash (const struct tls_multi *multi, const char **cn, uint32_t *cn_hash)
+{
+  if (multi)
+    {
+      const struct tls_session *s = &multi->session[TM_ACTIVE];
+      if (s->common_name && s->common_name[0] != '\0')
+	{
+	  *cn = s->common_name;
+	  *cn_hash = s->common_name_hashval;
+	  return true;
+	}
+    }
+  return false;
+}
+
+#endif
+
+/**
+ * Returns whether or not the server should check for username/password
+ *
+ * @param session	The current TLS session
+ *
+ * @return 		true if username and password verification is enabled,
+ * 			false if not.
+ *
+ */
+static inline bool verify_user_pass_enabled(struct tls_session *session)
+{
+  return (session->opt->auth_user_pass_verify_script
+        || plugin_defined (session->opt->plugins, OPENVPN_PLUGIN_AUTH_USER_PASS_VERIFY)
+#ifdef MANAGEMENT_DEF_AUTH
+        || management_enable_def_auth (management)
+#endif
+        );
+}
+
+/**
+ * Verify the given username and password, using either an external script, a
+ * plugin, or the management interface.
+ *
+ * If authentication succeeds, the appropriate state is filled into the
+ * session's primary key state's authenticated field. Authentication may also
+ * be deferred, in which case the key state's auth_deferred field is filled in.
+ *
+ * @param up		The username and password to verify.
+ * @param multi		The TLS multi structure to verify usernames against.
+ * @param session	The current TLS session
+ *
+ */
+void verify_user_pass(struct user_pass *up, struct tls_multi *multi,
+    struct tls_session *session);
+
+/**
+ * Perform final authentication checks, including locking of the cn, the allowed
+ * certificate hashes, and whether a client config entry exists in the
+ * client config directory.
+ *
+ * @param multi		The TLS multi structure to verify locked structures.
+ * @param session	The current TLS session
+ *
+ */
+void verify_final_auth_checks(struct tls_multi *multi, struct tls_session *session);
+
+#ifdef ENABLE_X509_TRACK
+
+struct x509_track
+{
+  const struct x509_track *next;
+  const char *name;
+# define XT_FULL_CHAIN (1<<0)
+  unsigned int flags;
+  int nid;
+};
+
+void x509_track_add (const struct x509_track **ll_head, const char *name, int msglevel, struct gc_arena *gc);
+
+#endif
+
+/*
+ * Certificate checking for verify_nsCertType
+ */
+/** Do not perform Netscape certificate type verification */
+#define NS_CERT_CHECK_NONE (0)
+/** Do not perform Netscape certificate type verification */
+#define NS_CERT_CHECK_SERVER (1<<0)
+/** Do not perform Netscape certificate type verification */
+#define NS_CERT_CHECK_CLIENT (1<<1)
+
+/*
+ * TODO: document
+ */
+#ifdef MANAGEMENT_DEF_AUTH
+bool tls_authenticate_key (struct tls_multi *multi, const unsigned int mda_key_id, const bool auth, const char *client_reason);
+void man_def_auth_set_client_reason (struct tls_multi *multi, const char *client_reason);
+#endif
+
+static inline const char *
+tls_client_reason (struct tls_multi *multi)
+{
+#ifdef ENABLE_DEF_AUTH
+  return multi->client_reason;
+#else
+  return NULL;
+#endif
+}
+
+#endif /* SSL_VERIFY_H_ */
+