+++ /dev/null
-#if defined(NO_BUFFER) || defined(NO_IP) || defined(NO_OPENSSL)
-#error "Badness, NO_BUFFER, NO_IP or NO_OPENSSL is defined, turn them *off*"
-#endif
-
-/* Include our bits'n'pieces */
-#include "tunala.h"
-
-
-/********************************************/
-/* Our local types that specify our "world" */
-/********************************************/
-
-/* These represent running "tunnels". Eg. if you wanted to do SSL in a
- * "message-passing" scanario, the "int" file-descriptors might be replaced by
- * thread or process IDs, and the "select" code might be replaced by message
- * handling code. Whatever. */
-typedef struct _tunala_item_t {
- /* The underlying SSL state machine. This is a data-only processing unit
- * and we communicate with it by talking to its four "buffers". */
- state_machine_t sm;
- /* The file-descriptors for the "dirty" (encrypted) side of the SSL
- * setup. In actuality, this is typically a socket and both values are
- * identical. */
- int dirty_read, dirty_send;
- /* The file-descriptors for the "clean" (unencrypted) side of the SSL
- * setup. These could be stdin/stdout, a socket (both values the same),
- * or whatever you like. */
- int clean_read, clean_send;
-} tunala_item_t;
-
-/* This structure is used as the data for running the main loop. Namely, in a
- * network format such as this, it is stuff for select() - but as pointed out,
- * when moving the real-world to somewhere else, this might be replaced by
- * something entirely different. It's basically the stuff that controls when
- * it's time to do some "work". */
-typedef struct _select_sets_t {
- int max; /* As required as the first argument to select() */
- fd_set reads, sends, excepts; /* As passed to select() */
-} select_sets_t;
-typedef struct _tunala_selector_t {
- select_sets_t last_selected; /* Results of the last select() */
- select_sets_t next_select; /* What we'll next select on */
-} tunala_selector_t;
-
-/* This structure is *everything*. We do it to avoid the use of globals so that,
- * for example, it would be easier to shift things around between async-IO,
- * thread-based, or multi-fork()ed (or combinations thereof). */
-typedef struct _tunala_world_t {
- /* The file-descriptor we "listen" on for new connections */
- int listen_fd;
- /* The array of tunnels */
- tunala_item_t *tunnels;
- /* the number of tunnels in use and allocated, respectively */
- unsigned int tunnels_used, tunnels_size;
- /* Our outside "loop" context stuff */
- tunala_selector_t selector;
- /* Our SSL_CTX, which is configured as the SSL client or server and has
- * the various cert-settings and callbacks configured. */
- SSL_CTX *ssl_ctx;
- /* Simple flag with complex logic :-) Indicates whether we're an SSL
- * server or an SSL client. */
- int server_mode;
-} tunala_world_t;
-
-/*****************************/
-/* Internal static functions */
-/*****************************/
-
-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);
-static void selector_init(tunala_selector_t *selector);
-static void selector_add_listener(tunala_selector_t *selector, int fd);
-static void selector_add_tunala(tunala_selector_t *selector, tunala_item_t *t);
-static int selector_select(tunala_selector_t *selector);
-/* 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);
-static int tunala_world_new_item(tunala_world_t *world, int fd,
- const char *ip, unsigned short port, int flipped);
-static void tunala_world_del_item(tunala_world_t *world, unsigned int idx);
-static int tunala_item_io(tunala_selector_t *selector, tunala_item_t *item);
-
-/*********************************************/
-/* MAIN FUNCTION (and its utility functions) */
-/*********************************************/
-
-static const char *def_proxyhost = "127.0.0.1:443";
-static const char *def_listenhost = "127.0.0.1:8080";
-static int def_max_tunnels = 50;
-static const char *def_cacert = NULL;
-static const char *def_cert = NULL;
-static const char *def_key = NULL;
-static const char *def_dcert = NULL;
-static const char *def_dkey = NULL;
-static const char *def_engine_id = NULL;
-static int def_server_mode = 0;
-static int def_flipped = 0;
-static const char *def_cipher_list = NULL;
-static const char *def_dh_file = NULL;
-static const char *def_dh_special = NULL;
-static int def_tmp_rsa = 1;
-static int def_ctx_options = 0;
-static int def_verify_mode = 0;
-static unsigned int def_verify_depth = 10;
-static int def_out_state = 0;
-static unsigned int def_out_verify = 0;
-static int def_out_totals = 0;
-static int def_out_conns = 0;
-
-static const char *helpstring =
-"\n'Tunala' (A tunneler with a New Zealand accent)\n"
-"Usage: tunala [options], where options are from;\n"
-" -listen [host:]<port> (default = 127.0.0.1:8080)\n"
-" -proxy <host>:<port> (default = 127.0.0.1:443)\n"
-" -maxtunnels <num> (default = 50)\n"
-" -cacert <path|NULL> (default = NULL)\n"
-" -cert <path|NULL> (default = NULL)\n"
-" -key <path|NULL> (default = whatever '-cert' is)\n"
-" -dcert <path|NULL> (usually for DSA, default = NULL)\n"
-" -dkey <path|NULL> (usually for DSA, default = whatever '-dcert' is)\n"
-" -engine <id|NULL> (default = NULL)\n"
-" -server <0|1> (default = 0, ie. an SSL client)\n"
-" -flipped <0|1> (makes SSL servers be network clients, and vice versa)\n"
-" -cipher <list> (specifies cipher list to use)\n"
-" -dh_file <path> (a PEM file containing DH parameters to use)\n"
-" -dh_special <NULL|generate|standard> (see below: def=NULL)\n"
-" -no_tmp_rsa (don't generate temporary RSA keys)\n"
-" -no_ssl2 (disable SSLv2)\n"
-" -no_ssl3 (disable SSLv3)\n"
-" -no_tls1 (disable TLSv1)\n"
-" -v_peer (verify the peer certificate)\n"
-" -v_strict (do not continue if peer doesn't authenticate)\n"
-" -v_once (no verification in renegotiates)\n"
-" -v_depth <num> (limit certificate chain depth, default = 10)\n"
-" -out_conns (prints client connections and disconnections)\n"
-" -out_state (prints SSL handshake states)\n"
-" -out_verify <0|1|2|3> (prints certificate verification states: def=1)\n"
-" -out_totals (prints out byte-totals when a tunnel closes)\n"
-" -<h|help|?> (displays this help screen)\n"
-"Notes:\n"
-"(1) It is recommended to specify a cert+key when operating as an SSL server.\n"
-" If you only specify '-cert', the same file must contain a matching\n"
-" private key.\n"
-"(2) Either dh_file or dh_special can be used to specify where DH parameters\n"
-" will be obtained from (or '-dh_special NULL' for the default choice) but\n"
-" you cannot specify both. For dh_special, 'generate' will create new DH\n"
-" parameters on startup, and 'standard' will use embedded parameters\n"
-" instead.\n"
-"(3) Normally an ssl client connects to an ssl server - so that an 'ssl client\n"
-" tunala' listens for 'clean' client connections and proxies ssl, and an\n"
-" 'ssl server tunala' listens for ssl connections and proxies 'clean'. With\n"
-" '-flipped 1', this behaviour is reversed so that an 'ssl server tunala'\n"
-" listens for clean client connections and proxies ssl (but participating\n"
-" as an ssl *server* in the SSL/TLS protocol), and an 'ssl client tunala'\n"
-" listens for ssl connections (participating as an ssl *client* in the\n"
-" SSL/TLS protocol) and proxies 'clean' to the end destination. This can\n"
-" be useful for allowing network access to 'servers' where only the server\n"
-" needs to authenticate the client (ie. the other way is not required).\n"
-" Even with client and server authentication, this 'technique' mitigates\n"
-" some DoS (denial-of-service) potential as it will be the network client\n"
-" having to perform the first private key operation rather than the other\n"
-" way round.\n"
-"(4) The 'technique' used by setting '-flipped 1' is probably compatible with\n"
-" absolutely nothing except another complimentary instance of 'tunala'\n"
-" running with '-flipped 1'. :-)\n";
-
-/* Default DH parameters for use with "-dh_special standard" ... stolen striaght
- * from s_server. */
-static unsigned char dh512_p[]={
- 0xDA,0x58,0x3C,0x16,0xD9,0x85,0x22,0x89,0xD0,0xE4,0xAF,0x75,
- 0x6F,0x4C,0xCA,0x92,0xDD,0x4B,0xE5,0x33,0xB8,0x04,0xFB,0x0F,
- 0xED,0x94,0xEF,0x9C,0x8A,0x44,0x03,0xED,0x57,0x46,0x50,0xD3,
- 0x69,0x99,0xDB,0x29,0xD7,0x76,0x27,0x6B,0xA2,0xD3,0xD4,0x12,
- 0xE2,0x18,0xF4,0xDD,0x1E,0x08,0x4C,0xF6,0xD8,0x00,0x3E,0x7C,
- 0x47,0x74,0xE8,0x33,
- };
-static unsigned char dh512_g[]={
- 0x02,
- };
-
-/* And the function that parses the above "standard" parameters, again, straight
- * out of s_server. */
-static DH *get_dh512(void)
- {
- DH *dh=NULL;
-
- if ((dh=DH_new()) == NULL) return(NULL);
- dh->p=BN_bin2bn(dh512_p,sizeof(dh512_p),NULL);
- dh->g=BN_bin2bn(dh512_g,sizeof(dh512_g),NULL);
- if ((dh->p == NULL) || (dh->g == NULL))
- return(NULL);
- return(dh);
- }
-
-/* Various help/error messages used by main() */
-static int usage(const char *errstr, int isunknownarg)
-{
- if(isunknownarg)
- fprintf(stderr, "Error: unknown argument '%s'\n", errstr);
- else
- fprintf(stderr, "Error: %s\n", errstr);
- fprintf(stderr, "%s\n", helpstring);
- return 1;
-}
-
-static int err_str0(const char *str0)
-{
- fprintf(stderr, "%s\n", str0);
- return 1;
-}
-
-static int err_str1(const char *fmt, const char *str1)
-{
- fprintf(stderr, fmt, str1);
- fprintf(stderr, "\n");
- return 1;
-}
-
-static int parse_max_tunnels(const char *s, unsigned int *maxtunnels)
-{
- unsigned long l;
- if(!int_strtoul(s, &l) || (l < 1) || (l > 1024)) {
- fprintf(stderr, "Error, '%s' is an invalid value for "
- "maxtunnels\n", s);
- return 0;
- }
- *maxtunnels = (unsigned int)l;
- return 1;
-}
-
-static int parse_server_mode(const char *s, int *servermode)
-{
- unsigned long l;
- if(!int_strtoul(s, &l) || (l > 1)) {
- fprintf(stderr, "Error, '%s' is an invalid value for the "
- "server mode\n", s);
- return 0;
- }
- *servermode = (int)l;
- return 1;
-}
-
-static int parse_dh_special(const char *s, const char **dh_special)
-{
- if((strcmp(s, "NULL") == 0) || (strcmp(s, "generate") == 0) ||
- (strcmp(s, "standard") == 0)) {
- *dh_special = s;
- return 1;
- }
- fprintf(stderr, "Error, '%s' is an invalid value for 'dh_special'\n", s);
- return 0;
-}
-
-static int parse_verify_level(const char *s, unsigned int *verify_level)
-{
- unsigned long l;
- if(!int_strtoul(s, &l) || (l > 3)) {
- fprintf(stderr, "Error, '%s' is an invalid value for "
- "out_verify\n", s);
- return 0;
- }
- *verify_level = (unsigned int)l;
- return 1;
-}
-
-static int parse_verify_depth(const char *s, unsigned int *verify_depth)
-{
- unsigned long l;
- if(!int_strtoul(s, &l) || (l < 1) || (l > 50)) {
- fprintf(stderr, "Error, '%s' is an invalid value for "
- "verify_depth\n", s);
- return 0;
- }
- *verify_depth = (unsigned int)l;
- return 1;
-}
-
-/* Some fprintf format strings used when tunnels close */
-static const char *io_stats_dirty =
-" SSL traffic; %8lu bytes in, %8lu bytes out\n";
-static const char *io_stats_clean =
-" clear traffic; %8lu bytes in, %8lu bytes out\n";
-
-int main(int argc, char *argv[])
-{
- unsigned int loop;
- int newfd;
- tunala_world_t world;
- tunala_item_t *t_item;
- const char *proxy_ip;
- unsigned short proxy_port;
- /* Overridables */
- const char *proxyhost = def_proxyhost;
- const char *listenhost = def_listenhost;
- unsigned int max_tunnels = def_max_tunnels;
- const char *cacert = def_cacert;
- const char *cert = def_cert;
- const char *key = def_key;
- const char *dcert = def_dcert;
- const char *dkey = def_dkey;
- const char *engine_id = def_engine_id;
- int server_mode = def_server_mode;
- int flipped = def_flipped;
- const char *cipher_list = def_cipher_list;
- const char *dh_file = def_dh_file;
- const char *dh_special = def_dh_special;
- int tmp_rsa = def_tmp_rsa;
- int ctx_options = def_ctx_options;
- int verify_mode = def_verify_mode;
- unsigned int verify_depth = def_verify_depth;
- int out_state = def_out_state;
- unsigned int out_verify = def_out_verify;
- int out_totals = def_out_totals;
- int out_conns = def_out_conns;
-
-/* Parse command-line arguments */
-next_arg:
- argc--; argv++;
- if(argc > 0) {
- if(strcmp(*argv, "-listen") == 0) {
- if(argc < 2)
- return usage("-listen requires an argument", 0);
- argc--; argv++;
- listenhost = *argv;
- goto next_arg;
- } else if(strcmp(*argv, "-proxy") == 0) {
- if(argc < 2)
- return usage("-proxy requires an argument", 0);
- argc--; argv++;
- proxyhost = *argv;
- goto next_arg;
- } else if(strcmp(*argv, "-maxtunnels") == 0) {
- if(argc < 2)
- return usage("-maxtunnels requires an argument", 0);
- argc--; argv++;
- if(!parse_max_tunnels(*argv, &max_tunnels))
- return 1;
- goto next_arg;
- } else if(strcmp(*argv, "-cacert") == 0) {
- if(argc < 2)
- return usage("-cacert requires an argument", 0);
- argc--; argv++;
- if(strcmp(*argv, "NULL") == 0)
- cacert = NULL;
- else
- cacert = *argv;
- goto next_arg;
- } else if(strcmp(*argv, "-cert") == 0) {
- if(argc < 2)
- return usage("-cert requires an argument", 0);
- argc--; argv++;
- if(strcmp(*argv, "NULL") == 0)
- cert = NULL;
- else
- cert = *argv;
- goto next_arg;
- } else if(strcmp(*argv, "-key") == 0) {
- if(argc < 2)
- return usage("-key requires an argument", 0);
- argc--; argv++;
- if(strcmp(*argv, "NULL") == 0)
- key = NULL;
- else
- key = *argv;
- 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
- dcert = *argv;
- goto next_arg;
- } else if(strcmp(*argv, "-dkey") == 0) {
- if(argc < 2)
- return usage("-dkey requires an argument", 0);
- argc--; argv++;
- if(strcmp(*argv, "NULL") == 0)
- dkey = NULL;
- else
- dkey = *argv;
- goto next_arg;
- } else if(strcmp(*argv, "-engine") == 0) {
- if(argc < 2)
- return usage("-engine requires an argument", 0);
- argc--; argv++;
- engine_id = *argv;
- 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--; 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;
-}
-
projects / cassiopeia.git / blobdiff