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+/*
+ * 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) 2002-2005 OpenVPN Solutions LLC <info@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 OPENVPN_SSL_H
+#define OPENVPN_SSL_H
+
+#if defined(USE_CRYPTO) && defined(USE_SSL)
+
+#include <openssl/ssl.h>
+#include <openssl/bio.h>
+#include <openssl/rand.h>
+#include <openssl/err.h>
+#include <openssl/pkcs12.h>
+#include <openssl/x509v3.h>
+
+#include "basic.h"
+#include "common.h"
+#include "crypto.h"
+#include "packet_id.h"
+#include "session_id.h"
+#include "reliable.h"
+#include "socket.h"
+#include "mtu.h"
+#include "thread.h"
+#include "options.h"
+#include "plugin.h"
+
+/*
+ * OpenVPN Protocol, taken from ssl.h in OpenVPN source code.
+ *
+ * TCP/UDP Packet: This represents the top-level encapsulation.
+ *
+ * TCP/UDP packet format:
+ *
+ * Packet length (16 bits, unsigned) -- TCP only, always sent as
+ * plaintext. Since TCP is a stream protocol, the packet
+ * length words define the packetization of the stream.
+ *
+ * Packet opcode/key_id (8 bits) -- TLS only, not used in
+ * pre-shared secret mode.
+ * packet message type, a P_* constant (high 5 bits)
+ * key_id (low 3 bits, see key_id in struct tls_session
+ * below for comment). The key_id refers to an
+ * already negotiated TLS session. OpenVPN seamlessly
+ * renegotiates the TLS session by using a new key_id
+ * for the new session. Overlap (controlled by
+ * user definable parameters) between old and new TLS
+ * sessions is allowed, providing a seamless transition
+ * during tunnel operation.
+ *
+ * Payload (n bytes), which may be a P_CONTROL, P_ACK, or P_DATA
+ * message.
+ *
+ * Message types:
+ *
+ * P_CONTROL_HARD_RESET_CLIENT_V1 -- Key method 1, initial key from
+ * client, forget previous state.
+ *
+ * P_CONTROL_HARD_RESET_SERVER_V1 -- Key method 2, initial key
+ * from server, forget previous state.
+ *
+ * P_CONTROL_SOFT_RESET_V1 -- New key, with a graceful transition
+ * from old to new key in the sense that a transition window
+ * exists where both the old or new key_id can be used. OpenVPN
+ * uses two different forms of key_id. The first form is 64 bits
+ * and is used for all P_CONTROL messages. P_DATA messages on the
+ * other hand use a shortened key_id of 3 bits for efficiency
+ * reasons since the vast majority of OpenVPN packets in an
+ * active tunnel will be P_DATA messages. The 64 bit form
+ * is referred to as a session_id, while the 3 bit form is
+ * referred to as a key_id.
+ *
+ * P_CONTROL_V1 -- Control channel packet (usually TLS ciphertext).
+ *
+ * P_ACK_V1 -- Acknowledgement for P_CONTROL packets received.
+ *
+ * P_DATA_V1 -- Data channel packet containing actual tunnel data
+ * ciphertext.
+ *
+ * P_CONTROL_HARD_RESET_CLIENT_V2 -- Key method 2, initial key from
+ * client, forget previous state.
+ *
+ * P_CONTROL_HARD_RESET_SERVER_V2 -- Key method 2, initial key from
+ * server, forget previous state.
+ *
+ * P_CONTROL* and P_ACK Payload: The P_CONTROL message type
+ * indicates a TLS ciphertext packet which has been encapsulated
+ * inside of a reliability layer. The reliability layer is
+ * implemented as a straightforward ACK and retransmit model.
+ *
+ * P_CONTROL message format:
+ *
+ * local session_id (random 64 bit value to identify TLS session).
+ * HMAC signature of entire encapsulation header for integrity
+ * check if --tls-auth is specified (usually 16 or 20 bytes).
+ * packet-id for replay protection (4 or 8 bytes, includes
+ * sequence number and optional time_t timestamp).
+ * P_ACK packet_id array length (1 byte).
+ * P_ACK packet-id array (if length > 0).
+ * P_ACK remote session_id (if length > 0).
+ * message packet-id (4 bytes).
+ * TLS payload ciphertext (n bytes) (only for P_CONTROL).
+ *
+ * Once the TLS session has been initialized and authenticated,
+ * the TLS channel is used to exchange random key material for
+ * bidirectional cipher and HMAC keys which will be
+ * used to secure actual tunnel packets. OpenVPN currently
+ * implements two key methods. Key method 1 directly
+ * derives keys using random bits obtained from the RAND_bytes
+ * OpenSSL function. Key method 2 mixes random key material
+ * from both sides of the connection using the TLS PRF mixing
+ * function. Key method 2 is the preferred method and is the default
+ * for OpenVPN 2.0.
+ *
+ * TLS plaintext content:
+ *
+ * TLS plaintext packet (if key_method == 1):
+ *
+ * Cipher key length in bytes (1 byte).
+ * Cipher key (n bytes).
+ * HMAC key length in bytes (1 byte).
+ * HMAC key (n bytes).
+ * Options string (n bytes, null terminated, client/server options
+ * string should match).
+ *
+ * TLS plaintext packet (if key_method == 2):
+ *
+ * Literal 0 (4 bytes).
+ * key_method type (1 byte).
+ * key_source structure (pre_master only defined for client ->
+ * server).
+ * options_string_length, including null (2 bytes).
+ * Options string (n bytes, null terminated, client/server options
+ * string must match).
+ * [The username/password data below is optional, record can end
+ * at this point.]
+ * username_string_length, including null (2 bytes).
+ * Username string (n bytes, null terminated).
+ * password_string_length, including null (2 bytes).
+ * Password string (n bytes, null terminated).
+ *
+ * The P_DATA payload represents encrypted, encapsulated tunnel
+ * packets which tend to be either IP packets or Ethernet frames.
+ * This is essentially the "payload" of the VPN.
+ *
+ * P_DATA message content:
+ * HMAC of ciphertext IV + ciphertext (if not disabled by
+ * --auth none).
+ * Ciphertext IV (size is cipher-dependent, if not disabled by
+ * --no-iv).
+ * Tunnel packet ciphertext.
+ *
+ * P_DATA plaintext
+ * packet_id (4 or 8 bytes, if not disabled by --no-replay).
+ * In SSL/TLS mode, 4 bytes are used because the implementation
+ * can force a TLS renegotation before 2^32 packets are sent.
+ * In pre-shared key mode, 8 bytes are used (sequence number
+ * and time_t value) to allow long-term key usage without
+ * packet_id collisions.
+ * User plaintext (n bytes).
+ *
+ * Notes:
+ * (1) ACK messages can be encoded in either the dedicated
+ * P_ACK record or they can be prepended to a P_CONTROL message.
+ * (2) P_DATA and P_CONTROL/P_ACK use independent packet-id
+ * sequences because P_DATA is an unreliable channel while
+ * P_CONTROL/P_ACK is a reliable channel. Each use their
+ * own independent HMAC keys.
+ * (3) Note that when --tls-auth is used, all message types are
+ * protected with an HMAC signature, even the initial packets
+ * of the TLS handshake. This makes it easy for OpenVPN to
+ * throw away bogus packets quickly, without wasting resources
+ * on attempting a TLS handshake which will ultimately fail.
+ */
+
+/* Used in the TLS PRF function */
+#define KEY_EXPANSION_ID "OpenVPN"
+
+/* passwords */
+#define UP_TYPE_AUTH "Auth"
+#define UP_TYPE_PRIVATE_KEY "Private Key"
+
+/* packet opcode (high 5 bits) and key-id (low 3 bits) are combined in one byte */
+#define P_KEY_ID_MASK 0x07
+#define P_OPCODE_SHIFT 3
+
+/* packet opcodes -- the V1 is intended to allow protocol changes in the future */
+#define P_CONTROL_HARD_RESET_CLIENT_V1 1 /* initial key from client, forget previous state */
+#define P_CONTROL_HARD_RESET_SERVER_V1 2 /* initial key from server, forget previous state */
+#define P_CONTROL_SOFT_RESET_V1 3 /* new key, graceful transition from old to new key */
+#define P_CONTROL_V1 4 /* control channel packet (usually TLS ciphertext) */
+#define P_ACK_V1 5 /* acknowledgement for packets received */
+#define P_DATA_V1 6 /* data channel packet */
+
+/* indicates key_method >= 2 */
+#define P_CONTROL_HARD_RESET_CLIENT_V2 7 /* initial key from client, forget previous state */
+#define P_CONTROL_HARD_RESET_SERVER_V2 8 /* initial key from server, forget previous state */
+
+/* define the range of legal opcodes */
+#define P_FIRST_OPCODE 1
+#define P_LAST_OPCODE 8
+
+/* key negotiation states */
+#define S_ERROR -1
+#define S_UNDEF 0
+#define S_INITIAL 1 /* tls_init() was called */
+#define S_PRE_START 2 /* waiting for initial reset & acknowledgement */
+#define S_START 3 /* ready to exchange keys */
+#define S_SENT_KEY 4 /* client does S_SENT_KEY -> S_GOT_KEY */
+#define S_GOT_KEY 5 /* server does S_GOT_KEY -> S_SENT_KEY */
+#define S_ACTIVE 6 /* ready to exchange data channel packets */
+#define S_NORMAL 7 /* normal operations */
+
+/*
+ * Are we ready to receive data channel packets?
+ *
+ * Also, if true, we can safely assume session has been
+ * authenticated by TLS.
+ *
+ * NOTE: Assumes S_SENT_KEY + 1 == S_GOT_KEY.
+ */
+#define DECRYPT_KEY_ENABLED(multi, ks) ((ks)->state >= (S_GOT_KEY - (multi)->opt.server))
+
+/* Should we aggregate TLS acknowledgements, and tack them onto control packets? */
+#define TLS_AGGREGATE_ACK
+
+/*
+ * If TLS_AGGREGATE_ACK, set the
+ * max number of acknowledgments that
+ * can "hitch a ride" on an outgoing
+ * non-P_ACK_V1 control packet.
+ */
+#define CONTROL_SEND_ACK_MAX 4
+
+/*
+ * Define number of buffers for send and receive in the reliability layer.
+ */
+#define TLS_RELIABLE_N_SEND_BUFFERS 4 /* also window size for reliablity layer */
+#define TLS_RELIABLE_N_REC_BUFFERS 8
+
+/*
+ * Various timeouts
+ */
+
+#define TLS_MULTI_REFRESH 15 /* call tls_multi_process once every n seconds */
+#define TLS_MULTI_HORIZON 2 /* call tls_multi_process frequently for n seconds after
+ every packet sent/received action */
+
+/* The SSL/TLS worker thread will wait at most this many seconds for the interprocess
+ communication pipe to the main thread to be ready to accept writes. */
+#define TLS_MULTI_THREAD_SEND_TIMEOUT 5
+
+/*
+ * Buffer sizes (also see mtu.h).
+ */
+
+#define PLAINTEXT_BUFFER_SIZE TLS_CHANNEL_BUF_SIZE
+
+/* Maximum length of common name */
+#define TLS_CN_LEN 64
+
+/* Legal characters in an X509 or common name */
+#define X509_NAME_CHAR_CLASS (CC_ALNUM|CC_UNDERBAR|CC_DASH|CC_DOT|CC_AT|CC_COLON|CC_SLASH|CC_EQUAL)
+#define COMMON_NAME_CHAR_CLASS (CC_ALNUM|CC_UNDERBAR|CC_DASH|CC_DOT|CC_AT)
+
+/* Maximum length of OCC options string passed as part of auth handshake */
+#define TLS_OPTIONS_LEN 512
+
+/*
+ * Range of key exchange methods
+ */
+#define KEY_METHOD_MIN 1
+#define KEY_METHOD_MAX 2
+
+/* key method taken from lower 4 bits */
+#define KEY_METHOD_MASK 0x0F
+
+/*
+ * Measure success rate of TLS handshakes, for debugging only
+ */
+/* #define MEASURE_TLS_HANDSHAKE_STATS */
+
+/*
+ * Key material, used as source for PRF-based
+ * key expansion.
+ */
+
+struct key_source {
+ uint8_t pre_master[48]; /* client generated */
+ uint8_t random1[32]; /* generated by both client and server */
+ uint8_t random2[32]; /* generated by both client and server */
+};
+
+struct key_source2 {
+ struct key_source client;
+ struct key_source server;
+};
+
+/*
+ * Represents a single instantiation of a TLS negotiation and
+ * data channel key exchange. 4 keys are kept: encrypt hmac,
+ * decrypt hmac, encrypt cipher, and decrypt cipher. The TLS
+ * control channel is used to exchange these keys.
+ * Each hard or soft reset will build
+ * a fresh key_state. Normally an openvpn session will contain two
+ * key_state objects, one for the current TLS connection, and other
+ * for the retiring or "lame duck" key. The lame duck key_state is
+ * used to maintain transmission continuity on the data-channel while
+ * a key renegotiation is taking place.
+ */
+struct key_state
+{
+ int state;
+ int key_id; /* inherited from struct tls_session below */
+
+ SSL *ssl; /* SSL object -- new obj created for each new key */
+ BIO *ssl_bio; /* read/write plaintext from here */
+ BIO *ct_in; /* write ciphertext to here */
+ BIO *ct_out; /* read ciphertext from here */
+
+ time_t established; /* when our state went S_ACTIVE */
+ time_t must_negotiate; /* key negotiation times out if not finished before this time */
+ time_t must_die; /* this object is destroyed at this time */
+
+ int initial_opcode; /* our initial P_ opcode */
+ struct session_id session_id_remote; /* peer's random session ID */
+ struct sockaddr_in remote_addr; /* peer's IP addr */
+ struct packet_id packet_id; /* for data channel, to prevent replay attacks */
+
+ struct key_ctx_bi key; /* data channel keys for encrypt/decrypt/hmac */
+
+ struct key_source2 *key_src; /* source entropy for key expansion */
+
+ struct buffer plaintext_read_buf;
+ struct buffer plaintext_write_buf;
+ struct buffer ack_write_buf;
+
+ struct reliable *send_reliable; /* holds a copy of outgoing packets until ACK received */
+ struct reliable *rec_reliable; /* order incoming ciphertext packets before we pass to TLS */
+ struct reliable_ack *rec_ack; /* buffers all packet IDs we want to ACK back to sender */
+
+ int n_bytes; /* how many bytes sent/recvd since last key exchange */
+ int n_packets; /* how many packets sent/recvd since last key exchange */
+
+ /*
+ * If bad username/password, TLS connection will come up but 'authenticated' will be false.
+ */
+ bool authenticated;
+};
+
+/*
+ * Our const options, obtained directly or derived from
+ * command line options.
+ */
+struct tls_options
+{
+ /* our master SSL_CTX from which all SSL objects derived */
+ SSL_CTX *ssl_ctx;
+
+ /* data channel cipher, hmac, and key lengths */
+ struct key_type key_type;
+
+ /* true if we are a TLS server, client otherwise */
+ bool server;
+
+#ifdef ENABLE_OCC
+ /* local and remote options strings
+ that must match between client and server */
+ const char *local_options;
+ const char *remote_options;
+#endif
+
+ /* from command line */
+ int key_method;
+ bool replay;
+ bool single_session;
+#ifdef ENABLE_OCC
+ bool disable_occ;
+#endif
+ int transition_window;
+ int handshake_window;
+ interval_t packet_timeout;
+ int renegotiate_bytes;
+ int renegotiate_packets;
+ interval_t renegotiate_seconds;
+
+ /* cert verification parms */
+ const char *verify_command;
+ const char *verify_x509name;
+ const char *crl_file;
+ int ns_cert_type;
+
+ /* allow openvpn config info to be
+ passed over control channel */
+ bool pass_config_info;
+
+ /* struct crypto_option flags */
+ unsigned int crypto_flags_and;
+ unsigned int crypto_flags_or;
+
+ int replay_window; /* --replay-window parm */
+ int replay_time; /* --replay-window parm */
+
+ /* packet authentication for TLS handshake */
+ struct crypto_options tls_auth;
+ struct key_ctx_bi tls_auth_key;
+
+ /* frame parameters for TLS control channel */
+ struct frame frame;
+
+ /* used for username/password authentication */
+ const char *auth_user_pass_verify_script;
+ bool auth_user_pass_verify_script_via_file;
+ const char *tmp_dir;
+ bool username_as_common_name;
+
+ /* use the client-config-dir as a positive authenticator */
+ const char *client_config_dir_exclusive;
+
+ /* instance-wide environment variable set */
+ struct env_set *es;
+ const struct plugin_list *plugins;
+
+ /* --gremlin bits */
+ int gremlin;
+};
+
+/* index into tls_session.key */
+#define KS_PRIMARY 0 /* the primary key */
+#define KS_LAME_DUCK 1 /* the key that's going to retire soon */
+#define KS_SIZE 2
+
+/*
+ * A tls_session lives through multiple key_state life-cycles. Soft resets
+ * will reuse a tls_session object, but hard resets or errors will require
+ * that a fresh object be built. Normally three tls_session objects are maintained
+ * by an active openvpn session. The first is the current, TLS authenticated
+ * session, the second is used to process connection requests from a new
+ * client that would usurp the current session if successfully authenticated,
+ * and the third is used as a repository for a "lame-duck" key in the event
+ * that the primary session resets due to error while the lame-duck key still
+ * has time left before its expiration. Lame duck keys are used to maintain
+ * the continuity of the data channel connection while a new key is being
+ * negotiated.
+ */
+struct tls_session
+{
+ /* const options and config info */
+ const struct tls_options *opt;
+
+ /* during hard reset used to control burst retransmit */
+ bool burst;
+
+ /* authenticate control packets */
+ struct crypto_options tls_auth;
+ struct packet_id tls_auth_pid;
+
+ int initial_opcode; /* our initial P_ opcode */
+ struct session_id session_id; /* our random session ID */
+ int key_id; /* increments with each soft reset (for key renegotiation) */
+
+ int limit_next; /* used for traffic shaping on the control channel */
+
+ int verify_maxlevel;
+
+ char *common_name;
+ bool verified; /* true if peer certificate was verified against CA */
+
+ /* not-yet-authenticated incoming client */
+ struct sockaddr_in untrusted_sockaddr;
+
+ struct key_state key[KS_SIZE];
+};
+
+/* index into tls_multi.session */
+#define TM_ACTIVE 0
+#define TM_UNTRUSTED 1
+#define TM_LAME_DUCK 2
+#define TM_SIZE 3
+
+/*
+ * The number of keys we will scan on encrypt or decrypt. The first
+ * is the "active" key. The second is the lame_duck or retiring key
+ * associated with the active key's session ID. The third is a detached
+ * lame duck session that only occurs in situations where a key renegotiate
+ * failed on the active key, but a lame duck key was still valid. By
+ * preserving the lame duck session, we can be assured of having a data
+ * channel key available even when network conditions are so bad that
+ * we can't negotiate a new key within the time allotted.
+ */
+#define KEY_SCAN_SIZE 3
+
+/*
+ * An openvpn session running with TLS enabled has one tls_multi object.
+ */
+struct tls_multi
+{
+ /* used to coordinate access between main thread and TLS thread */
+ /*MUTEX_PTR_DEFINE (mutex);*/
+
+ /* const options and config info */
+ struct tls_options opt;
+
+ /*
+ * A list of key_state objects in the order they should be
+ * scanned by data channel encrypt and decrypt routines.
+ */
+ struct key_state* key_scan[KEY_SCAN_SIZE];
+
+ /*
+ * used by tls_pre_encrypt to communicate the encrypt key
+ * to tls_post_encrypt()
+ */
+ struct key_state *save_ks; /* temporary pointer used between pre/post routines */
+
+ /*
+ * Number of sessions negotiated thus far.
+ */
+ int n_sessions;
+
+ /*
+ * Number of errors.
+ */
+ int n_hard_errors; /* errors due to TLS negotiation failure */
+ int n_soft_errors; /* errors due to unrecognized or failed-to-authenticate incoming packets */
+
+ /*
+ * Our locked common name (cannot change during the life of this tls_multi object)
+ */
+ char *locked_cn;
+
+ /*
+ * Our session objects.
+ */
+ struct tls_session session[TM_SIZE];
+};
+
+/*
+ * Used in --mode server mode to check tls-auth signature on initial
+ * packets received from new clients.
+ */
+struct tls_auth_standalone
+{
+ struct key_ctx_bi tls_auth_key;
+ struct crypto_options tls_auth_options;
+ struct frame frame;
+};
+
+void init_ssl_lib (void);
+void free_ssl_lib (void);
+
+/* Build master SSL_CTX object that serves for the whole of openvpn instantiation */
+SSL_CTX *init_ssl (const struct options *options);
+
+struct tls_multi *tls_multi_init (struct tls_options *tls_options);
+
+struct tls_auth_standalone *tls_auth_standalone_init (struct tls_options *tls_options,
+ struct gc_arena *gc);
+
+void tls_auth_standalone_finalize (struct tls_auth_standalone *tas,
+ const struct frame *frame);
+
+void tls_multi_init_finalize(struct tls_multi *multi,
+ const struct frame *frame);
+
+void tls_multi_init_set_options(struct tls_multi* multi,
+ const char *local,
+ const char *remote);
+
+bool tls_multi_process (struct tls_multi *multi,
+ struct buffer *to_link,
+ struct sockaddr_in *to_link_addr,
+ struct link_socket_info *to_link_socket_info,
+ interval_t *wakeup);
+
+void tls_multi_free (struct tls_multi *multi, bool clear);
+
+bool tls_pre_decrypt (struct tls_multi *multi,
+ struct sockaddr_in *from,
+ struct buffer *buf,
+ struct crypto_options *opt);
+
+bool tls_pre_decrypt_lite (const struct tls_auth_standalone *tas,
+ const struct sockaddr_in *from,
+ const struct buffer *buf);
+
+void tls_pre_encrypt (struct tls_multi *multi,
+ struct buffer *buf, struct crypto_options *opt);
+
+void tls_post_encrypt (struct tls_multi *multi, struct buffer *buf);
+
+void show_available_tls_ciphers (void);
+void get_highest_preference_tls_cipher (char *buf, int size);
+
+void pem_password_setup (const char *auth_file);
+int pem_password_callback (char *buf, int size, int rwflag, void *u);
+void auth_user_pass_setup (const char *auth_file);
+void ssl_set_auth_nocache (void);
+void ssl_purge_auth (void);
+
+void tls_set_verify_command (const char *cmd);
+void tls_set_crl_verify (const char *crl);
+void tls_set_verify_x509name (const char *x509name);
+
+void tls_adjust_frame_parameters(struct frame *frame);
+
+bool tls_send_payload (struct tls_multi *multi,
+ const uint8_t *data,
+ int size);
+
+bool tls_rec_payload (struct tls_multi *multi,
+ struct buffer *buf);
+
+const char *tls_common_name (struct tls_multi* multi, bool null);
+void tls_set_common_name (struct tls_multi *multi, const char *common_name);
+void tls_lock_common_name (struct tls_multi *multi);
+
+bool tls_authenticated (struct tls_multi *multi);
+void tls_deauthenticate (struct tls_multi *multi);
+
+/*
+ * inline functions
+ */
+
+static inline int
+tls_test_payload_len (const struct tls_multi *multi)
+{
+ if (multi)
+ {
+ const struct key_state *ks = &multi->session[TM_ACTIVE].key[KS_PRIMARY];
+ if (ks->state >= S_ACTIVE)
+ return BLEN (&ks->plaintext_read_buf);
+ }
+ return 0;
+}
+
+/*
+ * protocol_dump() flags
+ */
+#define PD_TLS_AUTH_HMAC_SIZE_MASK 0xFF
+#define PD_SHOW_DATA (1<<8)
+#define PD_TLS (1<<9)
+#define PD_VERBOSE (1<<10)
+
+const char *protocol_dump (struct buffer *buffer,
+ unsigned int flags,
+ struct gc_arena *gc);
+
+/*
+ * debugging code
+ */
+
+#ifdef MEASURE_TLS_HANDSHAKE_STATS
+void show_tls_performance_stats(void);
+#endif
+
+/*#define EXTRACT_X509_FIELD_TEST*/
+void extract_x509_field_test (void);
+
+#endif /* USE_CRYPTO && USE_SSL */
+
+#endif