From patchwork Sun Jul 19 07:34:33 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arne Schwabe X-Patchwork-Id: 1305 X-Patchwork-Delegate: gert@greenie.muc.de Return-Path: Delivered-To: patchwork@openvpn.net Delivered-To: patchwork@openvpn.net Received: from director8.mail.ord1d.rsapps.net ([172.30.191.6]) by backend30.mail.ord1d.rsapps.net with LMTP id 2KorAWSEFF8vCwAAIUCqbw for ; Sun, 19 Jul 2020 13:35:32 -0400 Received: from proxy2.mail.ord1d.rsapps.net ([172.30.191.6]) by director8.mail.ord1d.rsapps.net with LMTP id iLrzAGSEFF/YWgAAfY0hYg ; Sun, 19 Jul 2020 13:35:32 -0400 Received: from smtp19.gate.ord1c ([172.30.191.6]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) by proxy2.mail.ord1d.rsapps.net with LMTP id mPGdAGSEFF/9RwAAfawv4w ; Sun, 19 Jul 2020 13:35:32 -0400 X-Spam-Threshold: 95 X-Spam-Score: 0 X-Spam-Flag: NO X-Virus-Scanned: OK X-Orig-To: openvpnslackdevel@openvpn.net X-Originating-Ip: [216.105.38.7] Authentication-Results: smtp19.gate.ord1c.rsapps.net; iprev=pass policy.iprev="216.105.38.7"; spf=pass smtp.mailfrom="openvpn-devel-bounces@lists.sourceforge.net" smtp.helo="lists.sourceforge.net"; dkim=fail (signature verification failed) header.d=sourceforge.net; dkim=fail (signature verification failed) header.d=sf.net; dmarc=none (p=nil; dis=none) header.from=rfc2549.org X-Suspicious-Flag: YES X-Classification-ID: 3e16a762-c9e6-11ea-ae0f-bc305bf036e4-1-1 Received: from [216.105.38.7] ([216.105.38.7:48634] helo=lists.sourceforge.net) by smtp19.gate.ord1c.rsapps.net (envelope-from ) (ecelerity 4.2.38.62370 r(:)) with ESMTPS (cipher=DHE-RSA-AES256-GCM-SHA384) id D6/F5-09371-364841F5; Sun, 19 Jul 2020 13:35:31 -0400 Received: from [127.0.0.1] (helo=sfs-ml-4.v29.lw.sourceforge.com) by sfs-ml-4.v29.lw.sourceforge.com with esmtp (Exim 4.90_1) (envelope-from ) id 1jxDDA-0004Mm-Fh; Sun, 19 Jul 2020 17:34:52 +0000 Received: from [172.30.20.202] (helo=mx.sourceforge.net) by sfs-ml-4.v29.lw.sourceforge.com with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jxDD9-0004Mb-Jo for openvpn-devel@lists.sourceforge.net; Sun, 19 Jul 2020 17:34:51 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sourceforge.net; s=x; h=References:In-Reply-To:Message-Id:Date:Subject:Cc: To:From:Sender:Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=EDa/tEt/fHb95rVCYX7haSbND07zCn8X0vcqvtv5eUE=; b=h6YpLAyMZN6E8tam5ZyONKhonq IDU6GKjEOEJt5tE2R2eAtTRTx+IZR/fjqL2IH8kOtwTkg29ZuWTOD+8KdJ3URiRSgDReesuLkp1X9 gvouOay9Bi7nwJlCIsVw3E5dzeDNmDK44nfyQ/kd9V2cyE/P/kY1BOS3V+I0wwlxPZN8=; DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sf.net; s=x ; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To :MIME-Version:Content-Type:Content-Transfer-Encoding:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=EDa/tEt/fHb95rVCYX7haSbND07zCn8X0vcqvtv5eUE=; b=VWdS0Yb3WYwVKaWvpZfrqxSTIx v/AFu0yyUpfzDjMdo+tbhIlJsSMqHHkxEUz/Y9J5UyW3dTxA4zf7+rLKfrG6UiDiQmlgaW+9Zaug+ jj7UMJlHmgKSCPOAZwI3XisjdtERLlEjF3v86p1IHC/xKCewcmZAgrTZZ3q8vH9VcbVo=; Received: from mail.blinkt.de ([192.26.174.232]) by sfi-mx-3.v28.lw.sourceforge.com with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.92.2) id 1jxDD7-007yEi-JD for openvpn-devel@lists.sourceforge.net; Sun, 19 Jul 2020 17:34:51 +0000 Received: from kamera.blinkt.de ([2001:638:502:390:20c:29ff:fec8:535c]) by mail.blinkt.de with smtp (Exim 4.94 (FreeBSD)) (envelope-from ) id 1jxDCu-000BtC-Iy; Sun, 19 Jul 2020 19:34:36 +0200 Received: (nullmailer pid 16479 invoked by uid 10006); Sun, 19 Jul 2020 17:34:36 -0000 From: Arne Schwabe To: openvpn-devel@lists.sourceforge.net Date: Sun, 19 Jul 2020 19:34:33 +0200 Message-Id: <20200719173436.16431-2-arne@rfc2549.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200719173436.16431-1-arne@rfc2549.org> References: <20200719173436.16431-1-arne@rfc2549.org> X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. 0.0 URIBL_BLOCKED ADMINISTRATOR NOTICE: The query to URIBL was blocked. See http://wiki.apache.org/spamassassin/DnsBlocklists#dnsbl-block for more information. [URIs: rfc2549.org] 0.0 HEADER_FROM_DIFFERENT_DOMAINS From and EnvelopeFrom 2nd level mail domains are different 0.0 SPF_NONE SPF: sender does not publish an SPF Record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 AWL AWL: Adjusted score from AWL reputation of From: address X-Headers-End: 1jxDD7-007yEi-JD Subject: [Openvpn-devel] [PATCH v8 2/5] client-connect: Add deferred support to the client-connect script handler X-BeenThere: openvpn-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: openvpn-devel-bounces@lists.sourceforge.net X-getmail-retrieved-from-mailbox: Inbox From: Fabian Knittel This patch introduces the concept of a return value file for the client-connect handlers. (This is very similar to the auth value file used during deferred authentication.) The file name is stored in the client_connect_state struct. In addition, the patch also allows the storage of the client config file name in struct client_connect_state. Both changes are used by the client-connect script handler to support deferred client-connection handling. The deferred return value file (deferred_ret_file) is passed to the actual script via the environment. If the script succeeds and writes the value for deferral into the deferred_ret_file, the handler knows to indicate deferral. Later on, the deferred handler checks whether the value of the deferred_ret_file has been updated to success or failure. Signed-off-by: Fabian Knittel Signed-off-by: Arne Schwabe Acked-by: Gert Doering --- src/openvpn/multi.c | 229 +++++++++++++++++++++++++++++++++++++++++--- src/openvpn/multi.h | 12 +++ 2 files changed, 228 insertions(+), 13 deletions(-) diff --git a/src/openvpn/multi.c b/src/openvpn/multi.c index aab15cf7..165a3209 100644 --- a/src/openvpn/multi.c +++ b/src/openvpn/multi.c @@ -1851,6 +1851,171 @@ multi_client_set_protocol_options(struct context *c) } } +/** + * Delete the temporary file for the return value of client connect + * It also removes it from it from client_connect_defer_state and + * environment + */ +static void +ccs_delete_deferred_ret_file(struct multi_instance *mi) +{ + struct client_connect_defer_state *ccs = &(mi->client_connect_defer_state); + if (!ccs->deferred_ret_file) + { + return; + } + + setenv_del(mi->context.c2.es, "client_connect_deferred_file"); + if (!platform_unlink(ccs->deferred_ret_file)) + { + msg(D_MULTI_ERRORS, "MULTI: problem deleting temporary file: %s", + ccs->deferred_ret_file); + } + free(ccs->deferred_ret_file); + ccs->deferred_ret_file = NULL; +} + +/** + * Create a temporary file for the return value of client connect + * and puts it into the client_connect_defer_state and environment + * as "client_connect_deferred_file" + * + * @return boolean value if creation was successfull + */ +static bool +ccs_gen_deferred_ret_file(struct multi_instance *mi) +{ + struct client_connect_defer_state *ccs = &(mi->client_connect_defer_state); + struct gc_arena gc = gc_new(); + const char *fn; + + /* Delete file if it already exists */ + ccs_delete_deferred_ret_file(mi); + + fn = platform_create_temp_file(mi->context.options.tmp_dir, "ccr", &gc); + if (!fn) + { + gc_free(&gc); + return false; + } + ccs->deferred_ret_file = string_alloc(fn, NULL); + + setenv_str(mi->context.c2.es, "client_connect_deferred_file", + ccs->deferred_ret_file); + + gc_free(&gc); + return true; +} + +/** + * Tests whether the deferred return value file exists and returns the + * contained return value. + * + * @return CC_RET_SKIPPED if the file does not exist or is empty. + * CC_RET_DEFERRED, CC_RET_SUCCEEDED or CC_RET_FAILED depending on + * the value stored in the file. + */ +static enum client_connect_return +ccs_test_deferred_ret_file(struct multi_instance *mi) +{ + struct client_connect_defer_state *ccs = &(mi->client_connect_defer_state); + FILE *fp = fopen(ccs->deferred_ret_file, "r"); + if (!fp) + { + return CC_RET_SKIPPED; + } + + enum client_connect_return ret = CC_RET_SKIPPED; + const int c = fgetc(fp); + switch (c) + { + case '0': + ret = CC_RET_FAILED; + break; + + case '1': + ret = CC_RET_SUCCEEDED; + break; + + case '2': + ret = CC_RET_DEFERRED; + break; + + case EOF: + if (feof(fp)) + { + ret = CC_RET_SKIPPED; + break; + } + + /* Not EOF, but other error fall through to error state */ + default: + /* We received an unknown/unexpected value. Assume failure. */ + msg(M_WARN, "WARNING: Unknown/unexcepted value in deferred" + "client-connect resultfile"); + ret = CC_RET_FAILED; + } + fclose(fp); + + return ret; +} + +/** + * Deletes the temporary file for the config directives of the client connect + * script and removes it into the client_connect_defer_state and environment + * + */ +static void +ccs_delete_config_file(struct multi_instance *mi) +{ + struct client_connect_defer_state *ccs = &(mi->client_connect_defer_state); + if (ccs->config_file) + { + setenv_del(mi->context.c2.es, "client_connect_config_file"); + if (!platform_unlink(ccs->config_file)) + { + msg(D_MULTI_ERRORS, "MULTI: problem deleting temporary file: %s", + ccs->config_file); + } + free(ccs->config_file); + ccs->config_file = NULL; + } +} + +/** + * Create a temporary file for the config directives of the client connect + * script and puts it into the client_connect_defer_state and environment + * as "client_connect_config_file" + * + * @return boolean value if creation was successfull + */ +static bool +ccs_gen_config_file(struct multi_instance *mi) +{ + struct client_connect_defer_state *ccs = &(mi->client_connect_defer_state); + struct gc_arena gc = gc_new(); + const char *fn; + + if (ccs->config_file) + { + ccs_delete_config_file(mi); + } + + fn = platform_create_temp_file(mi->context.options.tmp_dir, "cc", &gc); + if (!fn) + { + gc_free(&gc); + return false; + } + ccs->config_file = string_alloc(fn, NULL); + + setenv_str(mi->context.c2.es, "client_connect_config_file", + ccs->config_file); + + gc_free(&gc); + return true; +} + static enum client_connect_return multi_client_connect_call_plugin_v1(struct multi_context *m, struct multi_instance *mi, @@ -1951,7 +2116,39 @@ multi_client_connect_call_plugin_v2(struct multi_context *m, return ret; } +static enum client_connect_return +multi_client_connect_script_deferred(struct multi_context *m, + struct multi_instance *mi, + unsigned int *option_types_found) +{ + ASSERT(mi); + ASSERT(option_types_found); + struct client_connect_defer_state *ccs = &(mi->client_connect_defer_state); + enum client_connect_return ret = CC_RET_SKIPPED; + + ret = ccs_test_deferred_ret_file(mi); + if (ret == CC_RET_SKIPPED) + { + /* + * Skipped and deferred are equivalent in this context. + * skipped means that the called program has not yet + * written a return status implicitly needing more time + * while deferred is the explicit notification that it + * needs more time + */ + ret = CC_RET_DEFERRED; + } + + if (ret != CC_RET_DEFERRED) + { + ccs_delete_deferred_ret_file(mi); + multi_client_connect_post(m, mi, ccs->config_file, + option_types_found); + ccs_delete_config_file(mi); + } + return ret; +} /** * Runs the --client-connect script if one is defined. @@ -1964,48 +2161,54 @@ multi_client_connect_call_script(struct multi_context *m, { if (deferred) { - return CC_RET_FAILED; + return multi_client_connect_script_deferred(m, mi, option_types_found); } ASSERT(m); ASSERT(mi); enum client_connect_return ret = CC_RET_SKIPPED; + struct client_connect_defer_state *ccs = &(mi->client_connect_defer_state); if (mi->context.options.client_connect_script) { struct argv argv = argv_new(); struct gc_arena gc = gc_new(); - const char *dc_file = NULL; setenv_str(mi->context.c2.es, "script_type", "client-connect"); - dc_file = platform_create_temp_file(mi->context.options.tmp_dir, - "cc", &gc); - if (!dc_file) + if (!ccs_gen_config_file(mi) + || !ccs_gen_deferred_ret_file(mi)) { ret = CC_RET_FAILED; goto cleanup; } argv_parse_cmd(&argv, mi->context.options.client_connect_script); - argv_printf_cat(&argv, "%s", dc_file); + argv_printf_cat(&argv, "%s", ccs->config_file); if (openvpn_run_script(&argv, mi->context.c2.es, 0, "--client-connect")) { - multi_client_connect_post(m, mi, dc_file, option_types_found); - ret = CC_RET_SUCCEEDED; + if (ccs_test_deferred_ret_file(mi) == CC_RET_DEFERRED) + { + ret = CC_RET_DEFERRED; + } + else + { + multi_client_connect_post(m, mi, ccs->config_file, + option_types_found); + ret = CC_RET_SUCCEEDED; + } } else { ret = CC_RET_FAILED; } - - if (!platform_unlink(dc_file)) +cleanup: + if (ret != CC_RET_DEFERRED) { - msg(D_MULTI_ERRORS, "MULTI: problem deleting temporary file: %s", - dc_file); + ccs_delete_config_file(mi); + ccs_delete_deferred_ret_file(mi); } -cleanup: argv_free(&argv); gc_free(&gc); } diff --git a/src/openvpn/multi.h b/src/openvpn/multi.h index 11da0209..3ebf6b9f 100644 --- a/src/openvpn/multi.h +++ b/src/openvpn/multi.h @@ -73,6 +73,18 @@ struct client_connect_defer_state /* Remember which option classes where processed for delayed option * handling. */ unsigned int option_types_found; + + /** + * The temporrary file name that contains the return status of the + * client-connect script if it exits with defer as status + */ + char *deferred_ret_file; + + /** + * The temporary file name that contains the config directives + * returned by the client-connect script + */ + char *config_file; }; /**