From patchwork Sat Nov 9 04:13:06 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arne Schwabe X-Patchwork-Id: 896 Return-Path: Delivered-To: patchwork@openvpn.net Delivered-To: patchwork@openvpn.net Received: from director8.mail.ord1d.rsapps.net ([172.28.255.1]) by backend30.mail.ord1d.rsapps.net with LMTP id wDyQHc3Xxl3JZgAAIUCqbw for ; Sat, 09 Nov 2019 10:14:21 -0500 Received: from proxy9.mail.ord1c.rsapps.net ([172.28.255.1]) by director8.mail.ord1d.rsapps.net with LMTP id mIxoHc3Xxl34NQAAfY0hYg ; Sat, 09 Nov 2019 10:14:21 -0500 Received: from smtp11.gate.ord1c ([172.28.255.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) by proxy9.mail.ord1c.rsapps.net with LMTP id OLA7Hc3Xxl2TagAAgxtkuw ; Sat, 09 Nov 2019 10:14:21 -0500 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: smtp11.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: 9a78f000-0303-11ea-95e1-bc305beffa54-1-1 Received: from [216.105.38.7] ([216.105.38.7:39870] helo=lists.sourceforge.net) by smtp11.gate.ord1c.rsapps.net (envelope-from ) (ecelerity 4.2.38.62370 r(:)) with ESMTPS (cipher=DHE-RSA-AES256-GCM-SHA384) id ED/D3-06596-CC7D6CD5; Sat, 09 Nov 2019 10:14:20 -0500 Received: from [127.0.0.1] (helo=sfs-ml-2.v29.lw.sourceforge.com) by sfs-ml-2.v29.lw.sourceforge.com with esmtp (Exim 4.90_1) (envelope-from ) id 1iTSQV-0001VW-W9; Sat, 09 Nov 2019 15:13:24 +0000 Received: from [172.30.20.202] (helo=mx.sourceforge.net) by sfs-ml-2.v29.lw.sourceforge.com with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1iTSQT-0001VD-LD for openvpn-devel@lists.sourceforge.net; Sat, 09 Nov 2019 15:13:21 +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:To: From:Sender:Reply-To:Cc: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=3iC7T4lROhlBnSRO+NP4fTZwNLcO6funZTQsCxE3Tn4=; b=CKuM+cM0N6rNTG5DghbOxGxa/Q 8t7KfG8jGgWF/7ULmBEwtILkl9zCP1TZBB1oVCBwObetNpoCjJixTJ90FW6XL+0kqr9KRq2SdyISK y1JWoC4cvdJIuMw9tcMgb1UiSY6aFSk65wHxUl4V/OFYRFzfyqTt4QsSsWFbJSwQnp7A=; 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:To:From:Sender:Reply-To:Cc :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=3iC7T4lROhlBnSRO+NP4fTZwNLcO6funZTQsCxE3Tn4=; b=HDJCLTf3bSUeh+Sev7W7VMglYO lAW+8Rv2EyLr4VBcUF5w++s0EvLTlgBGJAj0ZR805JSJ/Dq1usf0o12E7CGF7ZpDn+lVSrE4uo0hm XdYKnxav8GqauD/qvkx+4gwKj5X3u2kWbFSDhWmg1JPEGDFs6pjvOXpknmfehP494HV8=; Received: from mail.blinkt.de ([192.26.174.232]) by sfi-mx-1.v28.lw.sourceforge.com with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.92.2) id 1iTSQS-00Bfiy-Ch for openvpn-devel@lists.sourceforge.net; Sat, 09 Nov 2019 15:13:21 +0000 Received: from kamera.blinkt.de ([2001:638:502:390:20c:29ff:fec8:535c]) by mail.blinkt.de with smtp (Exim 4.92.3 (FreeBSD)) (envelope-from ) id 1iTSQF-000Q0I-38 for openvpn-devel@lists.sourceforge.net; Sat, 09 Nov 2019 16:13:07 +0100 Received: (nullmailer pid 18656 invoked by uid 10006); Sat, 09 Nov 2019 15:13:07 -0000 From: Arne Schwabe To: openvpn-devel@lists.sourceforge.net Date: Sat, 9 Nov 2019 16:13:06 +0100 Message-Id: <20191109151306.18597-5-arne@rfc2549.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20191109151306.18597-1-arne@rfc2549.org> References: <20191109151306.18597-1-arne@rfc2549.org> X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. 0.2 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 X-Headers-End: 1iTSQS-00Bfiy-Ch Subject: [Openvpn-devel] [PATCH v2 5/5] Implement forwarding client CR_RESPONSE messages to management 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 When signalling the client that it should do Challenge response without reconnecting (IV_SSO=crtext/INFOPRE=CR_TEXT), the server needs forward the response via the management console. Signed-off-by: Arne Schwabe --- doc/management-notes.txt | 26 +++++++++++++++++++++++++- src/openvpn/forward.c | 4 ++++ src/openvpn/manage.c | 28 +++++++++++++++++++++++++++- src/openvpn/manage.h | 4 ++++ src/openvpn/push.c | 21 +++++++++++++++++++++ src/openvpn/push.h | 2 ++ 6 files changed, 83 insertions(+), 2 deletions(-) diff --git a/doc/management-notes.txt b/doc/management-notes.txt index 4b405a9b..6d29b0d6 100644 --- a/doc/management-notes.txt +++ b/doc/management-notes.txt @@ -971,7 +971,7 @@ The ">CLIENT:" notification is enabled by the --management-client-auth OpenVPN configuration directive that gives the management interface client the responsibility to authenticate OpenVPN clients after their client certificate has been verified. CLIENT notifications may be multi-line, and -the sequentiality of a given CLIENT notification, its associated environmental +the sequentially of a given CLIENT notification, its associated environmental variables, and the terminating ">CLIENT:ENV,END" line are guaranteed to be atomic. @@ -1013,6 +1013,30 @@ CLIENT notification types: >CLIENT:ADDRESS,{CID},{ADDR},{PRI} +(5) Single Sign On Based Challenge/Response + + >CLIENT:CR_RESPONSE,{CID},{KID},{response_base64} + >CLIENT:ENV,name1=val1 + >CLIENT:ENV,name2=val2 + >CLIENT:ENV,... + >CLIENT:ENV,END + + CR_RESPONSE notification. The >CR_RESPONSE fulfils the same purpose as the + CRV1 response in the traditional challenge/response. See that section below for more + details. Since this still uses the same cid as the original response, we do + not use the username and opaque session data in this response. + + It is important to note that OpenVPN2 merely passes the authentication information and + does not do any further checks. (E.g. if a CR was issued before or if multiple CR responses + were sent from the client). + + This interface should be be sufficient for almost all challenge/response system that + can be implemented with a single round and base64 encoding the response. Mechanisms that + need multiple rounds or more complex answers should implement a different response type + than CR_RESPONSE. + + + Variables: CID -- Client ID, numerical ID for each connecting client, sequence = 0,1,2,... diff --git a/src/openvpn/forward.c b/src/openvpn/forward.c index 0f735384..48c316c9 100644 --- a/src/openvpn/forward.c +++ b/src/openvpn/forward.c @@ -403,6 +403,10 @@ check_incoming_control_channel_dowork(struct context *c) { server_pushed_info(c, &buf, 4); } + else if (buf_string_match_head_str(&buf, "CR_RESPONSE")) + { + receive_cr_response(c, &buf); + } else { msg(D_PUSH_ERRORS, "WARNING: Received unknown control message: %s", BSTR(&buf)); diff --git a/src/openvpn/manage.c b/src/openvpn/manage.c index c055f2ce..b3a4d5c8 100644 --- a/src/openvpn/manage.c +++ b/src/openvpn/manage.c @@ -2908,7 +2908,7 @@ management_notify_generic(struct management *man, const char *str) #ifdef MANAGEMENT_DEF_AUTH static void -man_output_peer_info_env(struct management *man, struct man_def_auth_context *mdac) +man_output_peer_info_env(struct management *man, const struct man_def_auth_context *mdac) { char line[256]; if (man->persist.callback.get_peer_info) @@ -2958,6 +2958,32 @@ management_notify_client_needing_auth(struct management *management, } } +void +management_notify_client_cr_response(unsigned mda_key_id, + const struct man_def_auth_context *mdac, + const struct env_set *es, + const char* response) +{ + struct gc_arena gc; + if (management) + { + gc = gc_new(); + + struct buffer out = alloc_buf_gc(256, &gc); + msg(M_CLIENT, ">CLIENT:CR_RESPONSE,%lu,%u,%s", + mdac->cid, mda_key_id, response); + man_output_extra_env(management, "CLIENT"); + if (management->connection.env_filter_level>0) + { + man_output_peer_info_env(management, mdac); + } + man_output_env(es, true, management->connection.env_filter_level, "CLIENT"); + management_notify_generic(management, BSTR(&out)); + + gc_free(&gc); + } +} + void management_connection_established(struct management *management, struct man_def_auth_context *mdac, diff --git a/src/openvpn/manage.h b/src/openvpn/manage.h index f570afc6..ff6b6737 100644 --- a/src/openvpn/manage.h +++ b/src/openvpn/manage.h @@ -432,6 +432,10 @@ void management_learn_addr(struct management *management, const struct mroute_addr *addr, const bool primary); +void management_notify_client_cr_response(unsigned mda_key_id, + const struct man_def_auth_context *mdac, + const struct env_set *es, + const char* response); #endif char *management_query_pk_sig(struct management *man, const char *b64_data); diff --git a/src/openvpn/push.c b/src/openvpn/push.c index 4b375ae3..c94076cb 100644 --- a/src/openvpn/push.c +++ b/src/openvpn/push.c @@ -210,6 +210,27 @@ server_pushed_info(struct context *c, const struct buffer *buffer, msg(D_PUSH, "Info command was pushed by server ('%s')", m); } +void +receive_cr_response(struct context *c, const struct buffer *buffer) +{ + struct buffer buf = *buffer; + const char *m = ""; + + if (buf_advance(&buf, 11) && buf_read_u8(&buf) == ',' && BLEN(&buf)) + { + m = BSTR(&buf); + } +#ifdef MANAGEMENT_DEF_AUTH + struct tls_session *session = &c->c2.tls_multi->session[TM_ACTIVE]; + struct man_def_auth_context *mda = session->opt->mda_context; + struct env_set *es = session->opt->es; + int key_id = session->key[KS_PRIMARY].key_id; + + + management_notify_client_cr_response(key_id, mda, es, m); +#endif + msg(D_PUSH, "CR response was sent by client ('%s')", m); +} #if P2MP_SERVER /** diff --git a/src/openvpn/push.h b/src/openvpn/push.h index f814f572..75ad330c 100644 --- a/src/openvpn/push.h +++ b/src/openvpn/push.h @@ -53,6 +53,8 @@ void server_pushed_signal(struct context *c, const struct buffer *buffer, const void server_pushed_info(struct context *c, const struct buffer *buffer, const int adv); +void receive_cr_response(struct context *c, const struct buffer *buffer); + void incoming_push_message(struct context *c, const struct buffer *buffer); #if P2MP_SERVER