1184 lines
43 KiB
C
1184 lines
43 KiB
C
#if defined(NO_BUFFER) || defined(NO_IP) || defined(NO_OPENSSL)
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# error "Badness, NO_BUFFER, NO_IP or NO_OPENSSL is defined, turn them *off*"
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#endif
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/* Include our bits'n'pieces */
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#include "tunala.h"
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/********************************************/
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/* Our local types that specify our "world" */
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/********************************************/
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/*
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* These represent running "tunnels". Eg. if you wanted to do SSL in a
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* "message-passing" scanario, the "int" file-descriptors might be replaced
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* by thread or process IDs, and the "select" code might be replaced by
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* message handling code. Whatever.
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*/
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typedef struct _tunala_item_t {
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/*
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* The underlying SSL state machine. This is a data-only processing unit
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* and we communicate with it by talking to its four "buffers".
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*/
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state_machine_t sm;
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/*
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* The file-descriptors for the "dirty" (encrypted) side of the SSL
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* setup. In actuality, this is typically a socket and both values are
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* identical.
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*/
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int dirty_read, dirty_send;
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/*
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* The file-descriptors for the "clean" (unencrypted) side of the SSL
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* setup. These could be stdin/stdout, a socket (both values the same),
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* or whatever you like.
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*/
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int clean_read, clean_send;
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} tunala_item_t;
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/*
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* This structure is used as the data for running the main loop. Namely, in a
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* network format such as this, it is stuff for select() - but as pointed out,
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* when moving the real-world to somewhere else, this might be replaced by
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* something entirely different. It's basically the stuff that controls when
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* it's time to do some "work".
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*/
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typedef struct _select_sets_t {
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int max; /* As required as the first argument to
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* select() */
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fd_set reads, sends, excepts; /* As passed to select() */
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} select_sets_t;
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typedef struct _tunala_selector_t {
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select_sets_t last_selected; /* Results of the last select() */
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select_sets_t next_select; /* What we'll next select on */
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} tunala_selector_t;
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/*
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* This structure is *everything*. We do it to avoid the use of globals so
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* that, for example, it would be easier to shift things around between
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* async-IO, thread-based, or multi-fork()ed (or combinations thereof).
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*/
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typedef struct _tunala_world_t {
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/* The file-descriptor we "listen" on for new connections */
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int listen_fd;
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/* The array of tunnels */
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tunala_item_t *tunnels;
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/* the number of tunnels in use and allocated, respectively */
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unsigned int tunnels_used, tunnels_size;
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/* Our outside "loop" context stuff */
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tunala_selector_t selector;
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/*
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* Our SSL_CTX, which is configured as the SSL client or server and has
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* the various cert-settings and callbacks configured.
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*/
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SSL_CTX *ssl_ctx;
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/*
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* Simple flag with complex logic :-) Indicates whether we're an SSL
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* server or an SSL client.
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*/
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int server_mode;
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} tunala_world_t;
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/*****************************/
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/* Internal static functions */
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/*****************************/
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static SSL_CTX *initialise_ssl_ctx(int server_mode, const char *engine_id,
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const char *CAfile, const char *cert,
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const char *key, const char *dcert,
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const char *dkey, const char *cipher_list,
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const char *dh_file,
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const char *dh_special, int tmp_rsa,
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int ctx_options, int out_state,
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int out_verify, int verify_mode,
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unsigned int verify_depth);
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static void selector_init(tunala_selector_t * selector);
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static void selector_add_listener(tunala_selector_t * selector, int fd);
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static void selector_add_tunala(tunala_selector_t * selector,
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tunala_item_t * t);
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static int selector_select(tunala_selector_t * selector);
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/*
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* This returns -1 for error, 0 for no new connections, or 1 for success, in
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* which case *newfd is populated.
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*/
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static int selector_get_listener(tunala_selector_t * selector, int fd,
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int *newfd);
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static int tunala_world_new_item(tunala_world_t * world, int fd,
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const char *ip, unsigned short port,
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int flipped);
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static void tunala_world_del_item(tunala_world_t * world, unsigned int idx);
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static int tunala_item_io(tunala_selector_t * selector, tunala_item_t * item);
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/*********************************************/
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/* MAIN FUNCTION (and its utility functions) */
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/*********************************************/
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static const char *def_proxyhost = "127.0.0.1:443";
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static const char *def_listenhost = "127.0.0.1:8080";
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static int def_max_tunnels = 50;
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static const char *def_cacert = NULL;
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static const char *def_cert = NULL;
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static const char *def_key = NULL;
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static const char *def_dcert = NULL;
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static const char *def_dkey = NULL;
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static const char *def_engine_id = NULL;
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static int def_server_mode = 0;
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static int def_flipped = 0;
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static const char *def_cipher_list = NULL;
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static const char *def_dh_file = NULL;
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static const char *def_dh_special = NULL;
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static int def_tmp_rsa = 1;
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static int def_ctx_options = 0;
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static int def_verify_mode = 0;
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static unsigned int def_verify_depth = 10;
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static int def_out_state = 0;
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static unsigned int def_out_verify = 0;
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static int def_out_totals = 0;
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static int def_out_conns = 0;
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static const char *helpstring =
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"\n'Tunala' (A tunneler with a New Zealand accent)\n"
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"Usage: tunala [options], where options are from;\n"
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" -listen [host:]<port> (default = 127.0.0.1:8080)\n"
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" -proxy <host>:<port> (default = 127.0.0.1:443)\n"
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" -maxtunnels <num> (default = 50)\n"
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" -cacert <path|NULL> (default = NULL)\n"
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" -cert <path|NULL> (default = NULL)\n"
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" -key <path|NULL> (default = whatever '-cert' is)\n"
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" -dcert <path|NULL> (usually for DSA, default = NULL)\n"
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" -dkey <path|NULL> (usually for DSA, default = whatever '-dcert' is)\n"
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" -engine <id|NULL> (default = NULL)\n"
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" -server <0|1> (default = 0, ie. an SSL client)\n"
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" -flipped <0|1> (makes SSL servers be network clients, and vice versa)\n"
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" -cipher <list> (specifies cipher list to use)\n"
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" -dh_file <path> (a PEM file containing DH parameters to use)\n"
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" -dh_special <NULL|generate|standard> (see below: def=NULL)\n"
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" -no_tmp_rsa (don't generate temporary RSA keys)\n"
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" -no_ssl2 (disable SSLv2)\n"
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" -no_ssl3 (disable SSLv3)\n"
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" -no_tls1 (disable TLSv1)\n"
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" -v_peer (verify the peer certificate)\n"
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" -v_strict (do not continue if peer doesn't authenticate)\n"
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" -v_once (no verification in renegotiates)\n"
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" -v_depth <num> (limit certificate chain depth, default = 10)\n"
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" -out_conns (prints client connections and disconnections)\n"
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" -out_state (prints SSL handshake states)\n"
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" -out_verify <0|1|2|3> (prints certificate verification states: def=1)\n"
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" -out_totals (prints out byte-totals when a tunnel closes)\n"
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" -<h|help|?> (displays this help screen)\n"
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"Notes:\n"
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"(1) It is recommended to specify a cert+key when operating as an SSL server.\n"
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" If you only specify '-cert', the same file must contain a matching\n"
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" private key.\n"
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"(2) Either dh_file or dh_special can be used to specify where DH parameters\n"
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" will be obtained from (or '-dh_special NULL' for the default choice) but\n"
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" you cannot specify both. For dh_special, 'generate' will create new DH\n"
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" parameters on startup, and 'standard' will use embedded parameters\n"
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" instead.\n"
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"(3) Normally an ssl client connects to an ssl server - so that an 'ssl client\n"
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" tunala' listens for 'clean' client connections and proxies ssl, and an\n"
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" 'ssl server tunala' listens for ssl connections and proxies 'clean'. With\n"
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" '-flipped 1', this behaviour is reversed so that an 'ssl server tunala'\n"
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" listens for clean client connections and proxies ssl (but participating\n"
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" as an ssl *server* in the SSL/TLS protocol), and an 'ssl client tunala'\n"
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" listens for ssl connections (participating as an ssl *client* in the\n"
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" SSL/TLS protocol) and proxies 'clean' to the end destination. This can\n"
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" be useful for allowing network access to 'servers' where only the server\n"
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" needs to authenticate the client (ie. the other way is not required).\n"
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" Even with client and server authentication, this 'technique' mitigates\n"
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" some DoS (denial-of-service) potential as it will be the network client\n"
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" having to perform the first private key operation rather than the other\n"
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" way round.\n"
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"(4) The 'technique' used by setting '-flipped 1' is probably compatible with\n"
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" absolutely nothing except another complimentary instance of 'tunala'\n"
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" running with '-flipped 1'. :-)\n";
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/*
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* Default DH parameters for use with "-dh_special standard" ... stolen
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* striaght from s_server.
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*/
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static unsigned char dh512_p[] = {
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0xDA, 0x58, 0x3C, 0x16, 0xD9, 0x85, 0x22, 0x89, 0xD0, 0xE4, 0xAF, 0x75,
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0x6F, 0x4C, 0xCA, 0x92, 0xDD, 0x4B, 0xE5, 0x33, 0xB8, 0x04, 0xFB, 0x0F,
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0xED, 0x94, 0xEF, 0x9C, 0x8A, 0x44, 0x03, 0xED, 0x57, 0x46, 0x50, 0xD3,
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0x69, 0x99, 0xDB, 0x29, 0xD7, 0x76, 0x27, 0x6B, 0xA2, 0xD3, 0xD4, 0x12,
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0xE2, 0x18, 0xF4, 0xDD, 0x1E, 0x08, 0x4C, 0xF6, 0xD8, 0x00, 0x3E, 0x7C,
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0x47, 0x74, 0xE8, 0x33,
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};
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static unsigned char dh512_g[] = {
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0x02,
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};
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/*
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* And the function that parses the above "standard" parameters, again,
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* straight out of s_server.
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*/
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static DH *get_dh512(void)
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{
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DH *dh = NULL;
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if ((dh = DH_new()) == NULL)
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return (NULL);
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dh->p = BN_bin2bn(dh512_p, sizeof(dh512_p), NULL);
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dh->g = BN_bin2bn(dh512_g, sizeof(dh512_g), NULL);
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if ((dh->p == NULL) || (dh->g == NULL))
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return (NULL);
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return (dh);
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}
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/* Various help/error messages used by main() */
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static int usage(const char *errstr, int isunknownarg)
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{
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if (isunknownarg)
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fprintf(stderr, "Error: unknown argument '%s'\n", errstr);
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else
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fprintf(stderr, "Error: %s\n", errstr);
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fprintf(stderr, "%s\n", helpstring);
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return 1;
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}
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static int err_str0(const char *str0)
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{
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fprintf(stderr, "%s\n", str0);
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return 1;
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}
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static int err_str1(const char *fmt, const char *str1)
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{
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fprintf(stderr, fmt, str1);
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fprintf(stderr, "\n");
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return 1;
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}
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static int parse_max_tunnels(const char *s, unsigned int *maxtunnels)
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{
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unsigned long l;
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if (!int_strtoul(s, &l) || (l < 1) || (l > 1024)) {
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fprintf(stderr, "Error, '%s' is an invalid value for "
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"maxtunnels\n", s);
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return 0;
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}
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*maxtunnels = (unsigned int)l;
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return 1;
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}
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static int parse_server_mode(const char *s, int *servermode)
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{
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unsigned long l;
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if (!int_strtoul(s, &l) || (l > 1)) {
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fprintf(stderr, "Error, '%s' is an invalid value for the "
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"server mode\n", s);
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return 0;
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}
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*servermode = (int)l;
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return 1;
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}
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static int parse_dh_special(const char *s, const char **dh_special)
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{
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if ((strcmp(s, "NULL") == 0) || (strcmp(s, "generate") == 0) ||
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(strcmp(s, "standard") == 0)) {
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*dh_special = s;
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return 1;
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}
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fprintf(stderr, "Error, '%s' is an invalid value for 'dh_special'\n", s);
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return 0;
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}
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static int parse_verify_level(const char *s, unsigned int *verify_level)
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{
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unsigned long l;
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if (!int_strtoul(s, &l) || (l > 3)) {
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fprintf(stderr, "Error, '%s' is an invalid value for "
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"out_verify\n", s);
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return 0;
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}
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*verify_level = (unsigned int)l;
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return 1;
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}
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static int parse_verify_depth(const char *s, unsigned int *verify_depth)
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{
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unsigned long l;
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if (!int_strtoul(s, &l) || (l < 1) || (l > 50)) {
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fprintf(stderr, "Error, '%s' is an invalid value for "
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"verify_depth\n", s);
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return 0;
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}
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*verify_depth = (unsigned int)l;
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return 1;
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}
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/* Some fprintf format strings used when tunnels close */
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static const char *io_stats_dirty =
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" SSL traffic; %8lu bytes in, %8lu bytes out\n";
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static const char *io_stats_clean =
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" clear traffic; %8lu bytes in, %8lu bytes out\n";
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int main(int argc, char *argv[])
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{
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unsigned int loop;
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int newfd;
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tunala_world_t world;
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tunala_item_t *t_item;
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const char *proxy_ip;
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unsigned short proxy_port;
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/* Overridables */
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const char *proxyhost = def_proxyhost;
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const char *listenhost = def_listenhost;
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unsigned int max_tunnels = def_max_tunnels;
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const char *cacert = def_cacert;
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const char *cert = def_cert;
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const char *key = def_key;
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const char *dcert = def_dcert;
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const char *dkey = def_dkey;
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const char *engine_id = def_engine_id;
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int server_mode = def_server_mode;
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int flipped = def_flipped;
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const char *cipher_list = def_cipher_list;
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const char *dh_file = def_dh_file;
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const char *dh_special = def_dh_special;
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int tmp_rsa = def_tmp_rsa;
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int ctx_options = def_ctx_options;
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int verify_mode = def_verify_mode;
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unsigned int verify_depth = def_verify_depth;
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int out_state = def_out_state;
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unsigned int out_verify = def_out_verify;
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int out_totals = def_out_totals;
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int out_conns = def_out_conns;
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/* Parse command-line arguments */
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next_arg:
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argc--;
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argv++;
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if (argc > 0) {
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if (strcmp(*argv, "-listen") == 0) {
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if (argc < 2)
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return usage("-listen requires an argument", 0);
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argc--;
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argv++;
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listenhost = *argv;
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goto next_arg;
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} else if (strcmp(*argv, "-proxy") == 0) {
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if (argc < 2)
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return usage("-proxy requires an argument", 0);
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argc--;
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argv++;
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proxyhost = *argv;
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goto next_arg;
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} else if (strcmp(*argv, "-maxtunnels") == 0) {
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if (argc < 2)
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return usage("-maxtunnels requires an argument", 0);
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argc--;
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argv++;
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if (!parse_max_tunnels(*argv, &max_tunnels))
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return 1;
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goto next_arg;
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} else if (strcmp(*argv, "-cacert") == 0) {
|
|
if (argc < 2)
|
|
return usage("-cacert requires an argument", 0);
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argc--;
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argv++;
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if (strcmp(*argv, "NULL") == 0)
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cacert = NULL;
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else
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cacert = *argv;
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goto next_arg;
|
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} else if (strcmp(*argv, "-cert") == 0) {
|
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if (argc < 2)
|
|
return usage("-cert requires an argument", 0);
|
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argc--;
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argv++;
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if (strcmp(*argv, "NULL") == 0)
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cert = NULL;
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else
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cert = *argv;
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goto next_arg;
|
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} else if (strcmp(*argv, "-key") == 0) {
|
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if (argc < 2)
|
|
return usage("-key requires an argument", 0);
|
|
argc--;
|
|
argv++;
|
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if (strcmp(*argv, "NULL") == 0)
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|
key = NULL;
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else
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key = *argv;
|
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goto next_arg;
|
|
} else if (strcmp(*argv, "-dcert") == 0) {
|
|
if (argc < 2)
|
|
return usage("-dcert requires an argument", 0);
|
|
argc--;
|
|
argv++;
|
|
if (strcmp(*argv, "NULL") == 0)
|
|
dcert = NULL;
|
|
else
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|
dcert = *argv;
|
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goto next_arg;
|
|
} else if (strcmp(*argv, "-dkey") == 0) {
|
|
if (argc < 2)
|
|
return usage("-dkey requires an argument", 0);
|
|
argc--;
|
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argv++;
|
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if (strcmp(*argv, "NULL") == 0)
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dkey = NULL;
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else
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dkey = *argv;
|
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goto next_arg;
|
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} else if (strcmp(*argv, "-engine") == 0) {
|
|
if (argc < 2)
|
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return usage("-engine requires an argument", 0);
|
|
argc--;
|
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argv++;
|
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engine_id = *argv;
|
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goto next_arg;
|
|
} else if (strcmp(*argv, "-server") == 0) {
|
|
if (argc < 2)
|
|
return usage("-server requires an argument", 0);
|
|
argc--;
|
|
argv++;
|
|
if (!parse_server_mode(*argv, &server_mode))
|
|
return 1;
|
|
goto next_arg;
|
|
} else if (strcmp(*argv, "-flipped") == 0) {
|
|
if (argc < 2)
|
|
return usage("-flipped requires an argument", 0);
|
|
argc--;
|
|
argv++;
|
|
if (!parse_server_mode(*argv, &flipped))
|
|
return 1;
|
|
goto next_arg;
|
|
} else if (strcmp(*argv, "-cipher") == 0) {
|
|
if (argc < 2)
|
|
return usage("-cipher requires an argument", 0);
|
|
argc--;
|
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argv++;
|
|
cipher_list = *argv;
|
|
goto next_arg;
|
|
} else if (strcmp(*argv, "-dh_file") == 0) {
|
|
if (argc < 2)
|
|
return usage("-dh_file requires an argument", 0);
|
|
if (dh_special)
|
|
return usage("cannot mix -dh_file with " "-dh_special", 0);
|
|
argc--;
|
|
argv++;
|
|
dh_file = *argv;
|
|
goto next_arg;
|
|
} else if (strcmp(*argv, "-dh_special") == 0) {
|
|
if (argc < 2)
|
|
return usage("-dh_special requires an argument", 0);
|
|
if (dh_file)
|
|
return usage("cannot mix -dh_file with " "-dh_special", 0);
|
|
argc--;
|
|
argv++;
|
|
if (!parse_dh_special(*argv, &dh_special))
|
|
return 1;
|
|
goto next_arg;
|
|
} else if (strcmp(*argv, "-no_tmp_rsa") == 0) {
|
|
tmp_rsa = 0;
|
|
goto next_arg;
|
|
} else if (strcmp(*argv, "-no_ssl2") == 0) {
|
|
ctx_options |= SSL_OP_NO_SSLv2;
|
|
goto next_arg;
|
|
} else if (strcmp(*argv, "-no_ssl3") == 0) {
|
|
ctx_options |= SSL_OP_NO_SSLv3;
|
|
goto next_arg;
|
|
} else if (strcmp(*argv, "-no_tls1") == 0) {
|
|
ctx_options |= SSL_OP_NO_TLSv1;
|
|
goto next_arg;
|
|
} else if (strcmp(*argv, "-v_peer") == 0) {
|
|
verify_mode |= SSL_VERIFY_PEER;
|
|
goto next_arg;
|
|
} else if (strcmp(*argv, "-v_strict") == 0) {
|
|
verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
|
|
goto next_arg;
|
|
} else if (strcmp(*argv, "-v_once") == 0) {
|
|
verify_mode |= SSL_VERIFY_CLIENT_ONCE;
|
|
goto next_arg;
|
|
} else if (strcmp(*argv, "-v_depth") == 0) {
|
|
if (argc < 2)
|
|
return usage("-v_depth requires an argument", 0);
|
|
argc--;
|
|
argv++;
|
|
if (!parse_verify_depth(*argv, &verify_depth))
|
|
return 1;
|
|
goto next_arg;
|
|
} else if (strcmp(*argv, "-out_state") == 0) {
|
|
out_state = 1;
|
|
goto next_arg;
|
|
} else if (strcmp(*argv, "-out_verify") == 0) {
|
|
if (argc < 2)
|
|
return usage("-out_verify requires an argument", 0);
|
|
argc--;
|
|
argv++;
|
|
if (!parse_verify_level(*argv, &out_verify))
|
|
return 1;
|
|
goto next_arg;
|
|
} else if (strcmp(*argv, "-out_totals") == 0) {
|
|
out_totals = 1;
|
|
goto next_arg;
|
|
} else if (strcmp(*argv, "-out_conns") == 0) {
|
|
out_conns = 1;
|
|
goto next_arg;
|
|
} else if ((strcmp(*argv, "-h") == 0) ||
|
|
(strcmp(*argv, "-help") == 0) ||
|
|
(strcmp(*argv, "-?") == 0)) {
|
|
fprintf(stderr, "%s\n", helpstring);
|
|
return 0;
|
|
} else
|
|
return usage(*argv, 1);
|
|
}
|
|
/* Run any sanity checks we want here */
|
|
if (!cert && !dcert && server_mode)
|
|
fprintf(stderr, "WARNING: you are running an SSL server without "
|
|
"a certificate - this may not work!\n");
|
|
|
|
/* Initialise network stuff */
|
|
if (!ip_initialise())
|
|
return err_str0("ip_initialise failed");
|
|
/* Create the SSL_CTX */
|
|
if ((world.ssl_ctx = initialise_ssl_ctx(server_mode, engine_id,
|
|
cacert, cert, key, dcert, dkey,
|
|
cipher_list, dh_file, dh_special,
|
|
tmp_rsa, ctx_options, out_state,
|
|
out_verify, verify_mode,
|
|
verify_depth)) == NULL)
|
|
return err_str1("initialise_ssl_ctx(engine_id=%s) failed",
|
|
(engine_id == NULL) ? "NULL" : engine_id);
|
|
if (engine_id)
|
|
fprintf(stderr, "Info, engine '%s' initialised\n", engine_id);
|
|
/* Create the listener */
|
|
if ((world.listen_fd = ip_create_listener(listenhost)) == -1)
|
|
return err_str1("ip_create_listener(%s) failed", listenhost);
|
|
fprintf(stderr, "Info, listening on '%s'\n", listenhost);
|
|
if (!ip_parse_address(proxyhost, &proxy_ip, &proxy_port, 0))
|
|
return err_str1("ip_parse_address(%s) failed", proxyhost);
|
|
fprintf(stderr, "Info, proxying to '%s' (%d.%d.%d.%d:%d)\n", proxyhost,
|
|
(int)proxy_ip[0], (int)proxy_ip[1],
|
|
(int)proxy_ip[2], (int)proxy_ip[3], (int)proxy_port);
|
|
fprintf(stderr, "Info, set maxtunnels to %d\n", (int)max_tunnels);
|
|
fprintf(stderr, "Info, set to operate as an SSL %s\n",
|
|
(server_mode ? "server" : "client"));
|
|
/* Initialise the rest of the stuff */
|
|
world.tunnels_used = world.tunnels_size = 0;
|
|
world.tunnels = NULL;
|
|
world.server_mode = server_mode;
|
|
selector_init(&world.selector);
|
|
|
|
/* We're ready to loop */
|
|
main_loop:
|
|
/* Should we listen for *new* tunnels? */
|
|
if (world.tunnels_used < max_tunnels)
|
|
selector_add_listener(&world.selector, world.listen_fd);
|
|
/* We should add in our existing tunnels */
|
|
for (loop = 0; loop < world.tunnels_used; loop++)
|
|
selector_add_tunala(&world.selector, world.tunnels + loop);
|
|
/* Now do the select */
|
|
switch (selector_select(&world.selector)) {
|
|
case -1:
|
|
if (errno != EINTR) {
|
|
fprintf(stderr, "selector_select returned a " "badness error.\n");
|
|
goto shouldnt_happen;
|
|
}
|
|
fprintf(stderr, "Warn, selector interrupted by a signal\n");
|
|
goto main_loop;
|
|
case 0:
|
|
fprintf(stderr, "Warn, selector_select returned 0 - signal?" "?\n");
|
|
goto main_loop;
|
|
default:
|
|
break;
|
|
}
|
|
/* Accept new connection if we should and can */
|
|
if ((world.tunnels_used < max_tunnels)
|
|
&& (selector_get_listener(&world.selector, world.listen_fd, &newfd) ==
|
|
1)) {
|
|
/* We have a new connection */
|
|
if (!tunala_world_new_item(&world, newfd, proxy_ip,
|
|
proxy_port, flipped))
|
|
fprintf(stderr, "tunala_world_new_item failed\n");
|
|
else if (out_conns)
|
|
fprintf(stderr, "Info, new tunnel opened, now up to "
|
|
"%d\n", world.tunnels_used);
|
|
}
|
|
/*
|
|
* Give each tunnel its moment, note the while loop is because it makes
|
|
* the logic easier than with "for" to deal with an array that may shift
|
|
* because of deletes.
|
|
*/
|
|
loop = 0;
|
|
t_item = world.tunnels;
|
|
while (loop < world.tunnels_used) {
|
|
if (!tunala_item_io(&world.selector, t_item)) {
|
|
/*
|
|
* We're closing whether for reasons of an error or a natural
|
|
* close. Don't increment loop or t_item because the next item is
|
|
* moving to us!
|
|
*/
|
|
if (!out_totals)
|
|
goto skip_totals;
|
|
fprintf(stderr, "Tunnel closing, traffic stats follow\n");
|
|
/* Display the encrypted (over the network) stats */
|
|
fprintf(stderr, io_stats_dirty,
|
|
buffer_total_in(state_machine_get_buffer
|
|
(&t_item->sm, SM_DIRTY_IN)),
|
|
buffer_total_out(state_machine_get_buffer
|
|
(&t_item->sm, SM_DIRTY_OUT)));
|
|
/*
|
|
* Display the local (tunnelled) stats. NB: Data we *receive* is
|
|
* data sent *out* of the state_machine on its 'clean' side.
|
|
* Hence the apparent back-to-front OUT/IN mixup here :-)
|
|
*/
|
|
fprintf(stderr, io_stats_clean,
|
|
buffer_total_out(state_machine_get_buffer
|
|
(&t_item->sm, SM_CLEAN_OUT)),
|
|
buffer_total_in(state_machine_get_buffer
|
|
(&t_item->sm, SM_CLEAN_IN)));
|
|
skip_totals:
|
|
tunala_world_del_item(&world, loop);
|
|
if (out_conns)
|
|
fprintf(stderr, "Info, tunnel closed, down to %d\n",
|
|
world.tunnels_used);
|
|
} else {
|
|
/* Move to the next item */
|
|
loop++;
|
|
t_item++;
|
|
}
|
|
}
|
|
goto main_loop;
|
|
/* Should never get here */
|
|
shouldnt_happen:
|
|
abort();
|
|
return 1;
|
|
}
|
|
|
|
/****************/
|
|
/* OpenSSL bits */
|
|
/****************/
|
|
|
|
static int ctx_set_cert(SSL_CTX *ctx, const char *cert, const char *key)
|
|
{
|
|
FILE *fp = NULL;
|
|
X509 *x509 = NULL;
|
|
EVP_PKEY *pkey = NULL;
|
|
int toret = 0; /* Assume an error */
|
|
|
|
/* cert */
|
|
if (cert) {
|
|
if ((fp = fopen(cert, "r")) == NULL) {
|
|
fprintf(stderr, "Error opening cert file '%s'\n", cert);
|
|
goto err;
|
|
}
|
|
if (!PEM_read_X509(fp, &x509, NULL, NULL)) {
|
|
fprintf(stderr, "Error reading PEM cert from '%s'\n", cert);
|
|
goto err;
|
|
}
|
|
if (!SSL_CTX_use_certificate(ctx, x509)) {
|
|
fprintf(stderr, "Error, cert in '%s' can not be used\n", cert);
|
|
goto err;
|
|
}
|
|
/* Clear the FILE* for reuse in the "key" code */
|
|
fclose(fp);
|
|
fp = NULL;
|
|
fprintf(stderr, "Info, operating with cert in '%s'\n", cert);
|
|
/*
|
|
* If a cert was given without matching key, we assume the same file
|
|
* contains the required key.
|
|
*/
|
|
if (!key)
|
|
key = cert;
|
|
} else {
|
|
if (key)
|
|
fprintf(stderr, "Error, can't specify a key without a "
|
|
"corresponding certificate\n");
|
|
else
|
|
fprintf(stderr, "Error, ctx_set_cert called with " "NULLs!\n");
|
|
goto err;
|
|
}
|
|
/* key */
|
|
if (key) {
|
|
if ((fp = fopen(key, "r")) == NULL) {
|
|
fprintf(stderr, "Error opening key file '%s'\n", key);
|
|
goto err;
|
|
}
|
|
if (!PEM_read_PrivateKey(fp, &pkey, NULL, NULL)) {
|
|
fprintf(stderr, "Error reading PEM key from '%s'\n", key);
|
|
goto err;
|
|
}
|
|
if (!SSL_CTX_use_PrivateKey(ctx, pkey)) {
|
|
fprintf(stderr, "Error, key in '%s' can not be used\n", key);
|
|
goto err;
|
|
}
|
|
fprintf(stderr, "Info, operating with key in '%s'\n", key);
|
|
} else
|
|
fprintf(stderr, "Info, operating without a cert or key\n");
|
|
/* Success */
|
|
toret = 1;
|
|
err:
|
|
if (x509)
|
|
X509_free(x509);
|
|
if (pkey)
|
|
EVP_PKEY_free(pkey);
|
|
if (fp)
|
|
fclose(fp);
|
|
return toret;
|
|
}
|
|
|
|
static int ctx_set_dh(SSL_CTX *ctx, const char *dh_file,
|
|
const char *dh_special)
|
|
{
|
|
DH *dh = NULL;
|
|
FILE *fp = NULL;
|
|
|
|
if (dh_special) {
|
|
if (strcmp(dh_special, "NULL") == 0)
|
|
return 1;
|
|
if (strcmp(dh_special, "standard") == 0) {
|
|
if ((dh = get_dh512()) == NULL) {
|
|
fprintf(stderr, "Error, can't parse 'standard'"
|
|
" DH parameters\n");
|
|
return 0;
|
|
}
|
|
fprintf(stderr, "Info, using 'standard' DH parameters\n");
|
|
goto do_it;
|
|
}
|
|
if (strcmp(dh_special, "generate") != 0)
|
|
/*
|
|
* This shouldn't happen - screening values is handled in main().
|
|
*/
|
|
abort();
|
|
fprintf(stderr, "Info, generating DH parameters ... ");
|
|
fflush(stderr);
|
|
if (!(dh = DH_new()) || !DH_generate_parameters_ex(dh, 512,
|
|
DH_GENERATOR_5,
|
|
NULL)) {
|
|
fprintf(stderr, "error!\n");
|
|
if (dh)
|
|
DH_free(dh);
|
|
return 0;
|
|
}
|
|
fprintf(stderr, "complete\n");
|
|
goto do_it;
|
|
}
|
|
/* So, we're loading dh_file */
|
|
if ((fp = fopen(dh_file, "r")) == NULL) {
|
|
fprintf(stderr, "Error, couldn't open '%s' for DH parameters\n",
|
|
dh_file);
|
|
return 0;
|
|
}
|
|
dh = PEM_read_DHparams(fp, NULL, NULL, NULL);
|
|
fclose(fp);
|
|
if (dh == NULL) {
|
|
fprintf(stderr, "Error, could not parse DH parameters from '%s'\n",
|
|
dh_file);
|
|
return 0;
|
|
}
|
|
fprintf(stderr, "Info, using DH parameters from file '%s'\n", dh_file);
|
|
do_it:
|
|
SSL_CTX_set_tmp_dh(ctx, dh);
|
|
DH_free(dh);
|
|
return 1;
|
|
}
|
|
|
|
static SSL_CTX *initialise_ssl_ctx(int server_mode, const char *engine_id,
|
|
const char *CAfile, const char *cert,
|
|
const char *key, const char *dcert,
|
|
const char *dkey, const char *cipher_list,
|
|
const char *dh_file,
|
|
const char *dh_special, int tmp_rsa,
|
|
int ctx_options, int out_state,
|
|
int out_verify, int verify_mode,
|
|
unsigned int verify_depth)
|
|
{
|
|
SSL_CTX *ctx = NULL, *ret = NULL;
|
|
const SSL_METHOD *meth;
|
|
ENGINE *e = NULL;
|
|
|
|
OpenSSL_add_ssl_algorithms();
|
|
SSL_load_error_strings();
|
|
|
|
meth = (server_mode ? SSLv23_server_method() : SSLv23_client_method());
|
|
if (meth == NULL)
|
|
goto err;
|
|
if (engine_id) {
|
|
ENGINE_load_builtin_engines();
|
|
if ((e = ENGINE_by_id(engine_id)) == NULL) {
|
|
fprintf(stderr, "Error obtaining '%s' engine, openssl "
|
|
"errors follow\n", engine_id);
|
|
goto err;
|
|
}
|
|
if (!ENGINE_set_default(e, ENGINE_METHOD_ALL)) {
|
|
fprintf(stderr, "Error assigning '%s' engine, openssl "
|
|
"errors follow\n", engine_id);
|
|
goto err;
|
|
}
|
|
ENGINE_free(e);
|
|
}
|
|
if ((ctx = SSL_CTX_new(meth)) == NULL)
|
|
goto err;
|
|
/* cacert */
|
|
if (CAfile) {
|
|
if (!X509_STORE_load_locations(SSL_CTX_get_cert_store(ctx),
|
|
CAfile, NULL)) {
|
|
fprintf(stderr, "Error loading CA cert(s) in '%s'\n", CAfile);
|
|
goto err;
|
|
}
|
|
fprintf(stderr, "Info, operating with CA cert(s) in '%s'\n", CAfile);
|
|
} else
|
|
fprintf(stderr, "Info, operating without a CA cert(-list)\n");
|
|
if (!SSL_CTX_set_default_verify_paths(ctx)) {
|
|
fprintf(stderr, "Error setting default verify paths\n");
|
|
goto err;
|
|
}
|
|
|
|
/* cert and key */
|
|
if ((cert || key) && !ctx_set_cert(ctx, cert, key))
|
|
goto err;
|
|
/* dcert and dkey */
|
|
if ((dcert || dkey) && !ctx_set_cert(ctx, dcert, dkey))
|
|
goto err;
|
|
/* temporary RSA key generation */
|
|
if (tmp_rsa)
|
|
SSL_CTX_set_tmp_rsa_callback(ctx, cb_generate_tmp_rsa);
|
|
|
|
/* cipher_list */
|
|
if (cipher_list) {
|
|
if (!SSL_CTX_set_cipher_list(ctx, cipher_list)) {
|
|
fprintf(stderr, "Error setting cipher list '%s'\n", cipher_list);
|
|
goto err;
|
|
}
|
|
fprintf(stderr, "Info, set cipher list '%s'\n", cipher_list);
|
|
} else
|
|
fprintf(stderr, "Info, operating with default cipher list\n");
|
|
|
|
/* dh_file & dh_special */
|
|
if ((dh_file || dh_special) && !ctx_set_dh(ctx, dh_file, dh_special))
|
|
goto err;
|
|
|
|
/* ctx_options */
|
|
SSL_CTX_set_options(ctx, ctx_options);
|
|
|
|
/* out_state (output of SSL handshake states to screen). */
|
|
if (out_state)
|
|
cb_ssl_info_set_output(stderr);
|
|
|
|
/* out_verify */
|
|
if (out_verify > 0) {
|
|
cb_ssl_verify_set_output(stderr);
|
|
cb_ssl_verify_set_level(out_verify);
|
|
}
|
|
|
|
/* verify_depth */
|
|
cb_ssl_verify_set_depth(verify_depth);
|
|
|
|
/* Success! (includes setting verify_mode) */
|
|
SSL_CTX_set_info_callback(ctx, cb_ssl_info);
|
|
SSL_CTX_set_verify(ctx, verify_mode, cb_ssl_verify);
|
|
ret = ctx;
|
|
err:
|
|
if (!ret) {
|
|
ERR_print_errors_fp(stderr);
|
|
if (ctx)
|
|
SSL_CTX_free(ctx);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*****************/
|
|
/* Selector bits */
|
|
/*****************/
|
|
|
|
static void selector_sets_init(select_sets_t * s)
|
|
{
|
|
s->max = 0;
|
|
FD_ZERO(&s->reads);
|
|
FD_ZERO(&s->sends);
|
|
FD_ZERO(&s->excepts);
|
|
}
|
|
|
|
static void selector_init(tunala_selector_t * selector)
|
|
{
|
|
selector_sets_init(&selector->last_selected);
|
|
selector_sets_init(&selector->next_select);
|
|
}
|
|
|
|
#define SEL_EXCEPTS 0x00
|
|
#define SEL_READS 0x01
|
|
#define SEL_SENDS 0x02
|
|
static void selector_add_raw_fd(tunala_selector_t * s, int fd, int flags)
|
|
{
|
|
FD_SET(fd, &s->next_select.excepts);
|
|
if (flags & SEL_READS)
|
|
FD_SET(fd, &s->next_select.reads);
|
|
if (flags & SEL_SENDS)
|
|
FD_SET(fd, &s->next_select.sends);
|
|
/* Adjust "max" */
|
|
if (s->next_select.max < (fd + 1))
|
|
s->next_select.max = fd + 1;
|
|
}
|
|
|
|
static void selector_add_listener(tunala_selector_t * selector, int fd)
|
|
{
|
|
selector_add_raw_fd(selector, fd, SEL_READS);
|
|
}
|
|
|
|
static void selector_add_tunala(tunala_selector_t * s, tunala_item_t * t)
|
|
{
|
|
/* Set clean read if sm.clean_in is not full */
|
|
if (t->clean_read != -1) {
|
|
selector_add_raw_fd(s, t->clean_read,
|
|
(buffer_full(state_machine_get_buffer(&t->sm,
|
|
SM_CLEAN_IN))
|
|
? SEL_EXCEPTS : SEL_READS));
|
|
}
|
|
/* Set clean send if sm.clean_out is not empty */
|
|
if (t->clean_send != -1) {
|
|
selector_add_raw_fd(s, t->clean_send,
|
|
(buffer_empty(state_machine_get_buffer(&t->sm,
|
|
SM_CLEAN_OUT))
|
|
? SEL_EXCEPTS : SEL_SENDS));
|
|
}
|
|
/* Set dirty read if sm.dirty_in is not full */
|
|
if (t->dirty_read != -1) {
|
|
selector_add_raw_fd(s, t->dirty_read,
|
|
(buffer_full(state_machine_get_buffer(&t->sm,
|
|
SM_DIRTY_IN))
|
|
? SEL_EXCEPTS : SEL_READS));
|
|
}
|
|
/* Set dirty send if sm.dirty_out is not empty */
|
|
if (t->dirty_send != -1) {
|
|
selector_add_raw_fd(s, t->dirty_send,
|
|
(buffer_empty(state_machine_get_buffer(&t->sm,
|
|
SM_DIRTY_OUT))
|
|
? SEL_EXCEPTS : SEL_SENDS));
|
|
}
|
|
}
|
|
|
|
static int selector_select(tunala_selector_t * selector)
|
|
{
|
|
memcpy(&selector->last_selected, &selector->next_select,
|
|
sizeof(select_sets_t));
|
|
selector_sets_init(&selector->next_select);
|
|
return select(selector->last_selected.max,
|
|
&selector->last_selected.reads,
|
|
&selector->last_selected.sends,
|
|
&selector->last_selected.excepts, NULL);
|
|
}
|
|
|
|
/*
|
|
* This returns -1 for error, 0 for no new connections, or 1 for success, in
|
|
* which case *newfd is populated.
|
|
*/
|
|
static int selector_get_listener(tunala_selector_t * selector, int fd,
|
|
int *newfd)
|
|
{
|
|
if (FD_ISSET(fd, &selector->last_selected.excepts))
|
|
return -1;
|
|
if (!FD_ISSET(fd, &selector->last_selected.reads))
|
|
return 0;
|
|
if ((*newfd = ip_accept_connection(fd)) == -1)
|
|
return -1;
|
|
return 1;
|
|
}
|
|
|
|
/************************/
|
|
/* "Tunala" world stuff */
|
|
/************************/
|
|
|
|
static int tunala_world_make_room(tunala_world_t * world)
|
|
{
|
|
unsigned int newsize;
|
|
tunala_item_t *newarray;
|
|
|
|
if (world->tunnels_used < world->tunnels_size)
|
|
return 1;
|
|
newsize = (world->tunnels_size == 0 ? 16 :
|
|
((world->tunnels_size * 3) / 2));
|
|
if ((newarray = malloc(newsize * sizeof(tunala_item_t))) == NULL)
|
|
return 0;
|
|
memset(newarray, 0, newsize * sizeof(tunala_item_t));
|
|
if (world->tunnels_used > 0)
|
|
memcpy(newarray, world->tunnels,
|
|
world->tunnels_used * sizeof(tunala_item_t));
|
|
if (world->tunnels_size > 0)
|
|
free(world->tunnels);
|
|
/* migrate */
|
|
world->tunnels = newarray;
|
|
world->tunnels_size = newsize;
|
|
return 1;
|
|
}
|
|
|
|
static int tunala_world_new_item(tunala_world_t * world, int fd,
|
|
const char *ip, unsigned short port,
|
|
int flipped)
|
|
{
|
|
tunala_item_t *item;
|
|
int newfd;
|
|
SSL *new_ssl = NULL;
|
|
|
|
if (!tunala_world_make_room(world))
|
|
return 0;
|
|
if ((new_ssl = SSL_new(world->ssl_ctx)) == NULL) {
|
|
fprintf(stderr, "Error creating new SSL\n");
|
|
ERR_print_errors_fp(stderr);
|
|
return 0;
|
|
}
|
|
item = world->tunnels + (world->tunnels_used++);
|
|
state_machine_init(&item->sm);
|
|
item->clean_read = item->clean_send =
|
|
item->dirty_read = item->dirty_send = -1;
|
|
if ((newfd = ip_create_connection_split(ip, port)) == -1)
|
|
goto err;
|
|
/*
|
|
* Which way round? If we're a server, "fd" is the dirty side and the
|
|
* connection we open is the clean one. For a client, it's the other way
|
|
* around. Unless, of course, we're "flipped" in which case everything
|
|
* gets reversed. :-)
|
|
*/
|
|
if ((world->server_mode && !flipped) || (!world->server_mode && flipped)) {
|
|
item->dirty_read = item->dirty_send = fd;
|
|
item->clean_read = item->clean_send = newfd;
|
|
} else {
|
|
item->clean_read = item->clean_send = fd;
|
|
item->dirty_read = item->dirty_send = newfd;
|
|
}
|
|
/*
|
|
* We use the SSL's "app_data" to indicate a call-back induced "kill"
|
|
*/
|
|
SSL_set_app_data(new_ssl, NULL);
|
|
if (!state_machine_set_SSL(&item->sm, new_ssl, world->server_mode))
|
|
goto err;
|
|
return 1;
|
|
err:
|
|
tunala_world_del_item(world, world->tunnels_used - 1);
|
|
return 0;
|
|
|
|
}
|
|
|
|
static void tunala_world_del_item(tunala_world_t * world, unsigned int idx)
|
|
{
|
|
tunala_item_t *item = world->tunnels + idx;
|
|
if (item->clean_read != -1)
|
|
close(item->clean_read);
|
|
if (item->clean_send != item->clean_read)
|
|
close(item->clean_send);
|
|
item->clean_read = item->clean_send = -1;
|
|
if (item->dirty_read != -1)
|
|
close(item->dirty_read);
|
|
if (item->dirty_send != item->dirty_read)
|
|
close(item->dirty_send);
|
|
item->dirty_read = item->dirty_send = -1;
|
|
state_machine_close(&item->sm);
|
|
/* OK, now we fix the item array */
|
|
if (idx + 1 < world->tunnels_used)
|
|
/* We need to scroll entries to the left */
|
|
memmove(world->tunnels + idx,
|
|
world->tunnels + (idx + 1),
|
|
(world->tunnels_used - (idx + 1)) * sizeof(tunala_item_t));
|
|
world->tunnels_used--;
|
|
}
|
|
|
|
static int tunala_item_io(tunala_selector_t * selector, tunala_item_t * item)
|
|
{
|
|
int c_r, c_s, d_r, d_s; /* Four boolean flags */
|
|
|
|
/* Take ourselves out of the gene-pool if there was an except */
|
|
if ((item->clean_read != -1) && FD_ISSET(item->clean_read,
|
|
&selector->
|
|
last_selected.excepts))
|
|
return 0;
|
|
if ((item->clean_send != -1) && FD_ISSET(item->clean_send,
|
|
&selector->
|
|
last_selected.excepts))
|
|
return 0;
|
|
if ((item->dirty_read != -1) && FD_ISSET(item->dirty_read,
|
|
&selector->
|
|
last_selected.excepts))
|
|
return 0;
|
|
if ((item->dirty_send != -1) && FD_ISSET(item->dirty_send,
|
|
&selector->
|
|
last_selected.excepts))
|
|
return 0;
|
|
/* Grab our 4 IO flags */
|
|
c_r = c_s = d_r = d_s = 0;
|
|
if (item->clean_read != -1)
|
|
c_r = FD_ISSET(item->clean_read, &selector->last_selected.reads);
|
|
if (item->clean_send != -1)
|
|
c_s = FD_ISSET(item->clean_send, &selector->last_selected.sends);
|
|
if (item->dirty_read != -1)
|
|
d_r = FD_ISSET(item->dirty_read, &selector->last_selected.reads);
|
|
if (item->dirty_send != -1)
|
|
d_s = FD_ISSET(item->dirty_send, &selector->last_selected.sends);
|
|
/* If no IO has happened for us, skip needless data looping */
|
|
if (!c_r && !c_s && !d_r && !d_s)
|
|
return 1;
|
|
if (c_r)
|
|
c_r = (buffer_from_fd(state_machine_get_buffer(&item->sm,
|
|
SM_CLEAN_IN),
|
|
item->clean_read) <= 0);
|
|
if (c_s)
|
|
c_s = (buffer_to_fd(state_machine_get_buffer(&item->sm,
|
|
SM_CLEAN_OUT),
|
|
item->clean_send) <= 0);
|
|
if (d_r)
|
|
d_r = (buffer_from_fd(state_machine_get_buffer(&item->sm,
|
|
SM_DIRTY_IN),
|
|
item->dirty_read) <= 0);
|
|
if (d_s)
|
|
d_s = (buffer_to_fd(state_machine_get_buffer(&item->sm,
|
|
SM_DIRTY_OUT),
|
|
item->dirty_send) <= 0);
|
|
/* If any of the flags is non-zero, that means they need closing */
|
|
if (c_r) {
|
|
close(item->clean_read);
|
|
if (item->clean_send == item->clean_read)
|
|
item->clean_send = -1;
|
|
item->clean_read = -1;
|
|
}
|
|
if (c_s && (item->clean_send != -1)) {
|
|
close(item->clean_send);
|
|
if (item->clean_send == item->clean_read)
|
|
item->clean_read = -1;
|
|
item->clean_send = -1;
|
|
}
|
|
if (d_r) {
|
|
close(item->dirty_read);
|
|
if (item->dirty_send == item->dirty_read)
|
|
item->dirty_send = -1;
|
|
item->dirty_read = -1;
|
|
}
|
|
if (d_s && (item->dirty_send != -1)) {
|
|
close(item->dirty_send);
|
|
if (item->dirty_send == item->dirty_read)
|
|
item->dirty_read = -1;
|
|
item->dirty_send = -1;
|
|
}
|
|
/*
|
|
* This function name is attributed to the term donated by David Schwartz
|
|
* on openssl-dev, message-ID:
|
|
* <NCBBLIEPOCNJOAEKBEAKEEDGLIAA.davids@webmaster.com>. :-)
|
|
*/
|
|
if (!state_machine_churn(&item->sm))
|
|
/*
|
|
* If the SSL closes, it will also zero-out the _in buffers and will
|
|
* in future process just outgoing data. As and when the outgoing
|
|
* data has gone, it will return zero here to tell us to bail out.
|
|
*/
|
|
return 0;
|
|
/* Otherwise, we return zero if both sides are dead. */
|
|
if (((item->clean_read == -1) || (item->clean_send == -1)) &&
|
|
((item->dirty_read == -1) || (item->dirty_send == -1)))
|
|
return 0;
|
|
/*
|
|
* If only one side closed, notify the SSL of this so it can take
|
|
* appropriate action.
|
|
*/
|
|
if ((item->clean_read == -1) || (item->clean_send == -1)) {
|
|
if (!state_machine_close_clean(&item->sm))
|
|
return 0;
|
|
}
|
|
if ((item->dirty_read == -1) || (item->dirty_send == -1)) {
|
|
if (!state_machine_close_dirty(&item->sm))
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|