ZyklonB: better SSL configuration
Allow specifying a custom certificate bundle (can be handy for connecting to servers with a self-signed certificate). Enabled certificate verification by default. Renamed the "ssl_use" to just "ssl".
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parent
7951dc4d85
commit
efcb9d17e5
115
zyklonb.c
115
zyklonb.c
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@ -33,8 +33,11 @@ static struct config_item g_config_table[] =
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{ "irc_host", NULL, "Address of the IRC server" },
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{ "irc_port", "6667", "Port of the IRC server" },
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{ "ssl_use", "off", "Whether to use SSL" },
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{ "ssl", "off", "Whether to use SSL" },
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{ "ssl_cert", NULL, "Client SSL certificate (PEM)" },
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{ "ssl_verify", "on", "Whether to verify certificates" },
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{ "ssl_ca_file", NULL, "OpenSSL CA bundle file" },
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{ "ssl_ca_path", NULL, "OpenSSL CA bundle path" },
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{ "autojoin", NULL, "Channels to join on start" },
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{ "reconnect", "on", "Whether to reconnect on error" },
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{ "reconnect_delay", "5", "Time between reconnecting" },
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@ -294,16 +297,67 @@ irc_send (struct bot_context *ctx, const char *format, ...)
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return result;
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}
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static int
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irc_ssl_verify_callback (int preverify_ok, X509_STORE_CTX *x509_ctx)
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static bool
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irc_get_boolean_from_config
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(struct bot_context *ctx, const char *name, bool *value, struct error **e)
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{
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(void) x509_ctx;
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const char *str = str_map_find (&ctx->config, name);
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hard_assert (str != NULL);
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if (!preverify_ok)
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print_warning ("TLS certificate verification failed");
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if (set_boolean_if_valid (value, str))
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return true;
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// We don't care; some encryption is always better than no encryption
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return 1;
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error_set (e, "invalid configuration value for `%s'", name);
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return false;
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}
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static bool
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irc_initialize_ssl_ctx (struct bot_context *ctx, struct error **e)
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{
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// XXX: maybe we should call SSL_CTX_set_options() for some workarounds
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bool verify;
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if (!irc_get_boolean_from_config (ctx, "ssl_verify", &verify, e))
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return false;
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if (!verify)
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SSL_CTX_set_verify (ctx->ssl_ctx, SSL_VERIFY_NONE, NULL);
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const char *ca_file = str_map_find (&ctx->config, "ca_file");
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const char *ca_path = str_map_find (&ctx->config, "ca_path");
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struct error *error = NULL;
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if (ca_file || ca_path)
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{
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if (SSL_CTX_load_verify_locations (ctx->ssl_ctx, ca_file, ca_path))
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return true;
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error_set (&error, "%s: %s",
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"failed to set locations for the CA certificate bundle",
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ERR_reason_error_string (ERR_get_error ()));
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goto ca_error;
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}
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if (!SSL_CTX_set_default_verify_paths (ctx->ssl_ctx))
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{
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error_set (&error, "%s: %s",
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"couldn't load the default CA certificate bundle",
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ERR_reason_error_string (ERR_get_error ()));
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goto ca_error;
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}
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return true;
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ca_error:
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if (verify)
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{
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error_propagate (e, error);
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return false;
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}
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// Only inform the user if we're not actually verifying
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print_warning ("%s", error->message);
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error_free (error);
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return true;
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}
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static bool
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@ -313,10 +367,8 @@ irc_initialize_ssl (struct bot_context *ctx, struct error **e)
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ctx->ssl_ctx = SSL_CTX_new (SSLv23_client_method ());
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if (!ctx->ssl_ctx)
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goto error_ssl_1;
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if (!SSL_CTX_set_default_verify_paths (ctx->ssl_ctx))
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print_warning ("couldn't load TLS CA certificates");
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SSL_CTX_set_verify (ctx->ssl_ctx, SSL_VERIFY_PEER, irc_ssl_verify_callback);
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// XXX: maybe we should call SSL_CTX_set_options() for some workarounds
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if (!irc_initialize_ssl_ctx (ctx, e))
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goto error_ssl_2;
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ctx->ssl = SSL_new (ctx->ssl_ctx);
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if (!ctx->ssl)
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@ -630,20 +682,14 @@ prepare_recovery_environment (void)
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}
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}
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static void
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setup_recovery_handler (struct bot_context *ctx)
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static bool
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setup_recovery_handler (struct bot_context *ctx, struct error **e)
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{
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const char *recover_str = str_map_find (&ctx->config, "recover");
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hard_assert (recover_str != NULL); // We have a default value for this
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bool recover;
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if (!set_boolean_if_valid (&recover, recover_str))
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{
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print_error ("invalid configuration value for `%s'", "recover");
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exit (EXIT_FAILURE);
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}
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if (!irc_get_boolean_from_config (ctx, "recover", &recover, e))
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return false;
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if (!recover)
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return;
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return true;
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// Make sure these signals aren't blocked, otherwise we would be unable
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// to handle them, making the critical conditions fatal.
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@ -668,6 +714,7 @@ setup_recovery_handler (struct bot_context *ctx)
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|| sigaction (SIGFPE, &sa, NULL) == -1
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|| sigaction (SIGILL, &sa, NULL) == -1)
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print_error ("sigaction: %s", strerror (errno));
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return true;
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}
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// --- SOCKS 5/4a (blocking implementation) ------------------------------------
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@ -2000,7 +2047,6 @@ irc_connect (struct bot_context *ctx, struct error **e)
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{
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const char *irc_host = str_map_find (&ctx->config, "irc_host");
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const char *irc_port = str_map_find (&ctx->config, "irc_port");
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const char *ssl_use_str = str_map_find (&ctx->config, "ssl_use");
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const char *socks_host = str_map_find (&ctx->config, "socks_host");
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const char *socks_port = str_map_find (&ctx->config, "socks_port");
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@ -2012,7 +2058,7 @@ irc_connect (struct bot_context *ctx, struct error **e)
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const char *realname = str_map_find (&ctx->config, "realname");
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// We have a default value for these
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hard_assert (irc_port && ssl_use_str && socks_port);
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hard_assert (irc_port && socks_port);
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hard_assert (nickname && username && realname);
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// TODO: again, get rid of `struct error' in here. The question is: how
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@ -2024,11 +2070,8 @@ irc_connect (struct bot_context *ctx, struct error **e)
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}
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bool use_ssl;
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if (!set_boolean_if_valid (&use_ssl, ssl_use_str))
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{
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error_set (e, "invalid configuration value for `%s'", "use_ssl");
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if (!irc_get_boolean_from_config (ctx, "ssl", &use_ssl, e))
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return false;
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}
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if (socks_host)
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{
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@ -2078,13 +2121,8 @@ irc_connect (struct bot_context *ctx, struct error **e)
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static bool
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parse_config (struct bot_context *ctx, struct error **e)
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{
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const char *reconnect_str = str_map_find (&ctx->config, "reconnect");
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hard_assert (reconnect_str != NULL); // We have a default value for this
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if (!set_boolean_if_valid (&ctx->reconnect, reconnect_str))
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{
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error_set (e, "invalid configuration value for `%s'", "reconnect");
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if (!irc_get_boolean_from_config (ctx, "reconnect", &ctx->reconnect, e))
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return false;
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}
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const char *delay_str = str_map_find (&ctx->config, "reconnect_delay");
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hard_assert (delay_str != NULL); // We have a default value for this
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@ -2248,15 +2286,14 @@ main (int argc, char *argv[])
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bot_context_init (&ctx);
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struct error *e = NULL;
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if (!read_config_file (&ctx.config, &e))
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if (!read_config_file (&ctx.config, &e)
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|| !setup_recovery_handler (&ctx, &e))
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{
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print_error ("error loading configuration: %s", e->message);
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print_error ("%s", e->message);
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error_free (e);
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exit (EXIT_FAILURE);
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}
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setup_recovery_handler (&ctx);
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poller_fd_init (&ctx.signal_event, &ctx.poller, g_signal_pipe[0]);
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ctx.signal_event.dispatcher = (poller_fd_fn) on_signal_pipe_readable;
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ctx.signal_event.user_data = &ctx;
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