Imported Upstream version 2.3_rc1

1 files changed, 563 insertions, 0 deletions

diff --git a/src/openvpn/manage.h b/src/openvpn/manage.h
new file mode 100644
index 0000000..28da69f
--- /dev/null
+++ b/src/openvpn/manage.h
@@ -0,0 +1,563 @@
+/*
+ *  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>
+ *
+ *  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
+ */
+
+#ifndef MANAGE_H
+#define MANAGE_H
+
+#ifdef ENABLE_MANAGEMENT
+
+#include "misc.h"
+#include "event.h"
+#include "socket.h"
+#include "mroute.h"
+
+#define MANAGEMENT_VERSION                      1
+#define MANAGEMENT_N_PASSWORD_RETRIES           3
+#define MANAGEMENT_LOG_HISTORY_INITIAL_SIZE   100
+#define MANAGEMENT_ECHO_BUFFER_SIZE           100
+#define MANAGEMENT_STATE_BUFFER_SIZE          100
+
+/*
+ * Management-interface-based deferred authentication
+ */
+#ifdef MANAGEMENT_DEF_AUTH
+struct man_def_auth_context {
+  unsigned long cid;
+
+#define DAF_CONNECTION_ESTABLISHED (1<<0)
+#define DAF_CONNECTION_CLOSED      (1<<1)
+#define DAF_INITIAL_AUTH           (1<<2)
+  unsigned int flags;
+
+  unsigned int mda_key_id_counter;
+
+  time_t bytecount_last_update;
+};
+#endif
+
+/*
+ * Manage build-up of command line
+ */
+struct command_line
+{
+  struct buffer buf;
+  struct buffer residual;
+};
+
+struct command_line *command_line_new (const int buf_len);
+void command_line_free (struct command_line *cl);
+
+void command_line_add (struct command_line *cl, const unsigned char *buf, const int len);
+const unsigned char *command_line_get (struct command_line *cl);
+void command_line_reset (struct command_line *cl);
+void command_line_next (struct command_line *cl);
+
+/*
+ * Manage log file history
+ */
+
+union log_entry_union {
+  unsigned int msg_flags;
+  int state;
+  int intval;
+};
+
+struct log_entry
+{
+  time_t timestamp;
+  const char *string;
+  in_addr_t local_ip;
+  in_addr_t remote_ip;
+  union log_entry_union u;
+};
+
+#define LOG_PRINT_LOG_PREFIX   (1<<0)
+#define LOG_PRINT_ECHO_PREFIX  (1<<1)
+#define LOG_PRINT_STATE_PREFIX (1<<2)
+
+#define LOG_PRINT_INT_DATE     (1<<3)
+#define LOG_PRINT_MSG_FLAGS    (1<<4)
+#define LOG_PRINT_STATE        (1<<5)
+#define LOG_PRINT_LOCAL_IP     (1<<6)
+
+#define LOG_PRINT_CRLF         (1<<7)
+#define LOG_FATAL_NOTIFY       (1<<8)
+
+#define LOG_PRINT_INTVAL       (1<<9)
+
+#define LOG_PRINT_REMOTE_IP    (1<<10)
+
+#define LOG_ECHO_TO_LOG        (1<<11)
+
+const char *log_entry_print (const struct log_entry *e, unsigned int flags, struct gc_arena *gc);
+
+struct log_history
+{
+  int base;
+  int size;
+  int capacity;
+  struct log_entry *array;
+};
+
+struct log_history *log_history_init (const int capacity);
+void log_history_close (struct log_history *h);
+void log_history_add (struct log_history *h, const struct log_entry *le);
+void log_history_resize (struct log_history *h, const int capacity);
+const struct log_entry *log_history_ref (const struct log_history *h, const int index);
+
+static inline int
+log_history_size (const struct log_history *h)
+{
+  return h->size;
+}
+
+static inline int
+log_history_capacity (const struct log_history *h)
+{
+  return h->capacity;
+}
+
+/*
+ * Callbacks for 'status' and 'kill' commands.
+ * Also for management-based deferred authentication and packet filter.
+ */
+struct management_callback
+{
+  void *arg;
+
+# define MCF_SERVER (1<<0) /* is OpenVPN being run as a server? */
+  unsigned int flags;
+
+  void (*status) (void *arg, const int version, struct status_output *so);
+  void (*show_net) (void *arg, const int msglevel);
+  int (*kill_by_cn) (void *arg, const char *common_name);
+  int (*kill_by_addr) (void *arg, const in_addr_t addr, const int port);
+  void (*delete_event) (void *arg, event_t event);
+  int (*n_clients) (void *arg);
+#ifdef MANAGEMENT_DEF_AUTH
+  bool (*kill_by_cid) (void *arg, const unsigned long cid, const char *kill_msg);
+  bool (*client_auth) (void *arg,
+		       const unsigned long cid,
+		       const unsigned int mda_key_id,
+		       const bool auth,
+		       const char *reason,
+		       const char *client_reason,
+		       struct buffer_list *cc_config); /* ownership transferred */
+  char *(*get_peer_info) (void *arg, const unsigned long cid);
+#endif
+#ifdef MANAGEMENT_PF
+  bool (*client_pf) (void *arg,
+		     const unsigned long cid,
+		     struct buffer_list *pf_config);   /* ownership transferred */
+#endif
+  bool (*proxy_cmd) (void *arg, const char **p);
+  bool (*remote_cmd) (void *arg, const char **p);
+};
+
+/*
+ * Management object, split into three components:
+ *
+ * struct man_persist : Data elements which are persistent across
+ *                      man_connection open and close.
+ *
+ * struct man_settings : management parameters.
+ *
+ * struct man_connection : created on socket binding and listen,
+ *                         deleted on socket unbind, may
+ *                         handle multiple sequential client
+ *                         connections.
+ */
+
+struct man_persist {
+  bool defined;
+
+  struct log_history *log;
+  struct virtual_output vout;
+
+  bool standalone_disabled;
+  struct management_callback callback;
+
+  struct log_history *echo; /* saved --echo strings */
+  struct log_history *state;
+
+  bool hold_release;
+
+  const char *special_state_msg;
+
+  counter_type bytes_in;
+  counter_type bytes_out;
+};
+
+struct man_settings {
+  bool defined;
+  unsigned int flags; /* MF_x flags */
+  struct openvpn_sockaddr local;
+#if UNIX_SOCK_SUPPORT
+  struct sockaddr_un local_unix;
+#endif
+  bool management_over_tunnel;
+  struct user_pass up;
+  int log_history_cache;
+  int echo_buffer_size;
+  int state_buffer_size;
+  char *write_peer_info_file;
+  int client_uid;
+  int client_gid;
+
+/* flags for handling the management interface "signal" command */
+# define MANSIG_IGNORE_USR1_HUP  (1<<0)
+# define MANSIG_MAP_USR1_TO_HUP  (1<<1)
+# define MANSIG_MAP_USR1_TO_TERM (1<<2)
+  unsigned int mansig;
+};
+
+/* up_query modes */
+#define UP_QUERY_DISABLED  0
+#define UP_QUERY_USER_PASS 1
+#define UP_QUERY_PASS      2
+#define UP_QUERY_NEED_OK   3
+#define UP_QUERY_NEED_STR  4
+
+/* states */
+#define MS_INITIAL          0  /* all sockets are closed */
+#define MS_LISTEN           1  /* no client is connected */
+#define MS_CC_WAIT_READ     2  /* client is connected, waiting for read on socket */
+#define MS_CC_WAIT_WRITE    3  /* client is connected, waiting for ability to write to socket */
+
+struct man_connection {
+  int state;
+
+  socket_descriptor_t sd_top;
+  socket_descriptor_t sd_cli;
+  struct openvpn_sockaddr remote;
+
+#ifdef WIN32
+  struct net_event_win32 ne32;
+#endif
+
+  bool halt;
+  bool password_verified;
+  int password_tries;
+
+  struct command_line *in;
+  struct buffer_list *out;
+
+#ifdef MANAGEMENT_IN_EXTRA
+# define IEC_UNDEF       0
+# define IEC_CLIENT_AUTH 1
+# define IEC_CLIENT_PF   2
+# define IEC_RSA_SIGN    3
+  int in_extra_cmd;
+  struct buffer_list *in_extra;
+#ifdef MANAGEMENT_DEF_AUTH
+  unsigned long in_extra_cid;
+  unsigned int in_extra_kid;
+#endif
+#ifdef MANAGMENT_EXTERNAL_KEY
+# define EKS_UNDEF   0
+# define EKS_SOLICIT 1
+# define EKS_INPUT   2
+# define EKS_READY   3
+  int ext_key_state;
+  struct buffer_list *ext_key_input;
+#endif
+#endif
+  struct event_set *es;
+  int env_filter_level;
+
+  bool state_realtime;
+  bool log_realtime;
+  bool echo_realtime;
+  int bytecount_update_seconds;
+  time_t bytecount_last_update;
+
+  const char *up_query_type;
+  int up_query_mode;
+  struct user_pass up_query;
+
+#ifdef MANAGMENT_EXTERNAL_KEY
+  struct buffer_list *rsa_sig;
+#endif
+};
+
+struct management
+{
+  struct man_persist persist;
+  struct man_settings settings;
+  struct man_connection connection;
+};
+
+extern struct management *management;
+
+struct user_pass;
+
+struct management *management_init (void);
+
+/* management_open flags */
+# define MF_SERVER            (1<<0)
+# define MF_QUERY_PASSWORDS   (1<<1)
+# define MF_HOLD              (1<<2)
+# define MF_SIGNAL            (1<<3)
+# define MF_FORGET_DISCONNECT (1<<4)
+# define MF_CONNECT_AS_CLIENT (1<<5)
+#ifdef MANAGEMENT_DEF_AUTH
+# define MF_CLIENT_AUTH       (1<<6)
+#endif
+#ifdef MANAGEMENT_PF
+# define MF_CLIENT_PF         (1<<7)
+#endif
+# define MF_UNIX_SOCK       (1<<8)
+#ifdef MANAGMENT_EXTERNAL_KEY
+# define MF_EXTERNAL_KEY    (1<<9)
+#endif
+#define MF_UP_DOWN          (1<<10)
+#define MF_QUERY_REMOTE     (1<<11)
+#define MF_QUERY_PROXY      (1<<12)
+
+bool management_open (struct management *man,
+		      const char *addr,
+		      const int port,
+		      const char *pass_file,
+		      const char *client_user,
+		      const char *client_group,
+		      const int log_history_cache,
+		      const int echo_buffer_size,
+		      const int state_buffer_size,
+		      const char *write_peer_info_file,
+		      const int remap_sigusr1,
+		      const unsigned int flags);
+
+void management_close (struct management *man);
+
+void management_post_tunnel_open (struct management *man, const in_addr_t tun_local_ip);
+
+void management_pre_tunnel_close (struct management *man);
+
+void management_socket_set (struct management *man,
+			    struct event_set *es,
+			    void *arg,
+			    unsigned int *persistent);
+
+void management_io (struct management *man);
+
+void management_set_callback (struct management *man,
+			      const struct management_callback *cb);
+
+void management_clear_callback (struct management *man);
+
+bool management_query_user_pass (struct management *man,
+				 struct user_pass *up,
+				 const char *type,
+				 const unsigned int flags,
+				 const char *static_challenge);
+
+bool management_should_daemonize (struct management *man);
+bool management_would_hold (struct management *man);
+bool management_hold (struct management *man);
+
+void management_event_loop_n_seconds (struct management *man, int sec);
+
+void management_up_down(struct management *man, const char *updown, const struct env_set *es);
+
+void management_notify(struct management *man, const char *severity, const char *type, const char *text);
+
+void management_notify_generic (struct management *man, const char *str);
+
+#ifdef MANAGEMENT_DEF_AUTH
+void management_notify_client_needing_auth (struct management *management,
+					    const unsigned int auth_id,
+					    struct man_def_auth_context *mdac,
+					    const struct env_set *es);
+
+void management_connection_established (struct management *management,
+					struct man_def_auth_context *mdac,
+					const struct env_set *es);
+
+void management_notify_client_close (struct management *management,
+				     struct man_def_auth_context *mdac,
+				     const struct env_set *es);
+
+void management_learn_addr (struct management *management,
+			    struct man_def_auth_context *mdac,
+			    const struct mroute_addr *addr,
+			    const bool primary);
+#endif
+
+#ifdef MANAGMENT_EXTERNAL_KEY
+
+char *management_query_rsa_sig (struct management *man, const char *b64_data);
+
+#endif
+
+static inline bool
+management_connected (const struct management *man)
+{
+  return man->connection.state == MS_CC_WAIT_READ || man->connection.state == MS_CC_WAIT_WRITE;
+}
+
+static inline bool
+management_query_user_pass_enabled (const struct management *man)
+{
+  return BOOL_CAST(man->settings.flags & MF_QUERY_PASSWORDS);
+}
+
+static inline bool
+management_query_remote_enabled (const struct management *man)
+{
+  return BOOL_CAST(man->settings.flags & MF_QUERY_REMOTE);
+}
+
+static inline bool
+management_query_proxy_enabled (const struct management *man)
+{
+  return BOOL_CAST(man->settings.flags & MF_QUERY_PROXY);
+}
+
+#ifdef MANAGEMENT_PF
+static inline bool
+management_enable_pf (const struct management *man)
+{
+  return man && BOOL_CAST(man->settings.flags & MF_CLIENT_PF);
+}
+#endif
+
+#ifdef MANAGEMENT_DEF_AUTH
+static inline bool
+management_enable_def_auth (const struct management *man)
+{
+  return man && BOOL_CAST(man->settings.flags & MF_CLIENT_AUTH);
+}
+#endif
+
+/*
+ * OpenVPN tells the management layer what state it's in
+ */
+
+/* client/server states */
+#define OPENVPN_STATE_INITIAL       0  /* Initial, undefined state */
+#define OPENVPN_STATE_CONNECTING    1  /* Management interface has been initialized */
+#define OPENVPN_STATE_ASSIGN_IP     2  /* Assigning IP address to virtual network interface */
+#define OPENVPN_STATE_ADD_ROUTES    3  /* Adding routes to system */
+#define OPENVPN_STATE_CONNECTED     4  /* Initialization sequence completed */
+#define OPENVPN_STATE_RECONNECTING  5  /* Restart */
+#define OPENVPN_STATE_EXITING       6  /* Exit */
+
+/* client-only states */
+#define OPENVPN_STATE_WAIT          7  /* Waiting for initial response from server */
+#define OPENVPN_STATE_AUTH          8  /* Authenticating with server */
+#define OPENVPN_STATE_GET_CONFIG    9  /* Downloading configuration from server */
+#define OPENVPN_STATE_RESOLVE       10 /* DNS lookup */
+#define OPENVPN_STATE_TCP_CONNECT   11 /* Connecting to TCP server */
+
+#define OPENVPN_STATE_CLIENT_BASE   7  /* Base index of client-only states */
+
+void management_set_state (struct management *man,
+			   const int state,
+			   const char *detail,
+			   const in_addr_t tun_local_ip,
+			   const in_addr_t tun_remote_ip);
+
+/*
+ * The management object keeps track of OpenVPN --echo
+ * parameters.
+ */
+void management_echo (struct management *man, const char *string, const bool pull);
+
+/*
+ * OpenVPN calls here to indicate a password failure
+ */
+
+void management_auth_failure (struct management *man, const char *type, const char *reason);
+
+/*
+ * Echo an authentication token to management interface
+ */
+void management_auth_token (struct management *man, const char *token);
+
+/*
+ * These functions drive the bytecount in/out counters.
+ */
+
+void man_bytecount_output_client (struct management *man);
+
+static inline void
+man_bytecount_possible_output_client (struct management *man)
+{
+  if (man->connection.bytecount_update_seconds > 0
+      && now >= man->connection.bytecount_last_update
+      + man->connection.bytecount_update_seconds)
+    man_bytecount_output_client (man);
+}
+
+static inline void
+management_bytes_out_client (struct management *man, const int size)
+{
+  man->persist.bytes_out += size;
+  man_bytecount_possible_output_client (man);
+}
+
+static inline void
+management_bytes_in_client (struct management *man, const int size)
+{
+  man->persist.bytes_in += size;
+  man_bytecount_possible_output_client (man);
+}
+
+static inline void
+management_bytes_out (struct management *man, const int size)
+{
+  if (!(man->persist.callback.flags & MCF_SERVER))
+    management_bytes_out_client (man, size);
+}
+
+static inline void
+management_bytes_in (struct management *man, const int size)
+{
+  if (!(man->persist.callback.flags & MCF_SERVER))
+    management_bytes_in_client (man, size);
+}
+
+#ifdef MANAGEMENT_DEF_AUTH
+
+static inline void
+management_bytes_server (struct management *man,
+			 const counter_type *bytes_in_total,
+			 const counter_type *bytes_out_total,
+			 struct man_def_auth_context *mdac)
+{
+  void man_bytecount_output_server (struct management *man,
+				    const counter_type *bytes_in_total,
+				    const counter_type *bytes_out_total,
+				    struct man_def_auth_context *mdac);
+
+  if (man->connection.bytecount_update_seconds > 0
+      && now >= mdac->bytecount_last_update + man->connection.bytecount_update_seconds
+      && (mdac->flags & (DAF_CONNECTION_ESTABLISHED|DAF_CONNECTION_CLOSED)) == DAF_CONNECTION_ESTABLISHED)
+    man_bytecount_output_server (man, bytes_in_total, bytes_out_total, mdac);
+}
+
+#endif /* MANAGEMENT_DEF_AUTH */
+
+#endif
+#endif