mirror of
https://github.com/irssi/irssi.git
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Added support for SCRAM-SHA-1, SCRAM-SHA-256 and SCRAM-SHA-512
This commit is contained in:
Patrick Okraku
Ailin Nemui
parent
91dac0e5a1
commit
f2b97631e1
@ -36,8 +36,8 @@
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-cmdmax: Specifies the maximum number of commands to perform before
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starting the internal flood protection.
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-sasl_mechanism Specifies the mechanism to use for the SASL authentication.
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At the moment irssi only supports the 'plain' and the
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'external' mechanisms.
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Irssi supports: PLAIN, EXTERNAL, SCRAM-SHA-1, SCRAM-SHA-256
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and SCRAM-SHA-512
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Use '' to disable the authentication.
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-sasl_username Specifies the username to use during the SASL authentication.
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-sasl_password Specifies the password to use during the SASL authentication.
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@ -77,6 +77,10 @@ static void destroy_server_connect(SERVER_CONNECT_REC *conn)
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g_free_not_null(ircconn->alternate_nick);
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g_free_not_null(ircconn->sasl_username);
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g_free_not_null(ircconn->sasl_password);
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if (ircconn->scram_session != NULL) {
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scram_session_free(ircconn->scram_session);
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}
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}
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void irc_core_init(void)
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@ -128,11 +128,27 @@ static void sig_server_setup_fill_chatnet(IRC_SERVER_CONNECT_REC *conn,
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conn->sasl_password = g_strdup(ircnet->sasl_password);
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} else
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g_warning("The fields sasl_username and sasl_password are either missing or empty");
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}
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else if (!g_ascii_strcasecmp(ircnet->sasl_mechanism, "external")) {
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} else if (!g_ascii_strcasecmp(ircnet->sasl_mechanism, "SCRAM-SHA-1") ||
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!g_ascii_strcasecmp(ircnet->sasl_mechanism, "SCRAM-SHA-256") ||
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!g_ascii_strcasecmp(ircnet->sasl_mechanism, "SCRAM-SHA-512")) {
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/* The SCRAM-SHA-* methods need both the username and the password */
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if (ircnet->sasl_username != NULL && *ircnet->sasl_username &&
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ircnet->sasl_password != NULL && *ircnet->sasl_password) {
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if (!g_ascii_strcasecmp(ircnet->sasl_mechanism, "SCRAM-SHA-1"))
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conn->sasl_mechanism = SASL_MECHANISM_SCRAM_SHA_1;
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if (!g_ascii_strcasecmp(ircnet->sasl_mechanism, "SCRAM-SHA-256"))
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conn->sasl_mechanism = SASL_MECHANISM_SCRAM_SHA_256;
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if (!g_ascii_strcasecmp(ircnet->sasl_mechanism, "SCRAM-SHA-512"))
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conn->sasl_mechanism = SASL_MECHANISM_SCRAM_SHA_512;
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conn->sasl_username = g_strdup(ircnet->sasl_username);
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conn->sasl_password = g_strdup(ircnet->sasl_password);
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} else
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g_warning("The fields sasl_username and sasl_password are either "
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"missing or empty");
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} else if (!g_ascii_strcasecmp(ircnet->sasl_mechanism, "external")) {
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conn->sasl_mechanism = SASL_MECHANISM_EXTERNAL;
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}
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else
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} else
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g_warning("Unsupported SASL mechanism \"%s\" selected", ircnet->sasl_mechanism);
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}
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}
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@ -4,6 +4,7 @@
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#include <irssi/src/core/chat-protocols.h>
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#include <irssi/src/core/servers.h>
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#include <irssi/src/irc/core/modes.h>
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#include <irssi/src/irc/core/scram.h>
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/*
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* 63 is the maximum hostname length defined by the protocol. 10 is a common
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@ -54,6 +55,7 @@ struct _IRC_SERVER_CONNECT_REC {
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int sasl_mechanism;
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char *sasl_username;
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char *sasl_password;
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SCRAM_SESSION_REC *scram_session;
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int max_cmds_at_once;
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int cmd_queue_speed;
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@ -28,6 +28,7 @@ libirc_core_a = static_library('irc_core',
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'modes.c',
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'netsplit.c',
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'sasl.c',
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'scram.c',
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'servers-idle.c',
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'servers-redirect.c',
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),
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@ -70,6 +71,7 @@ install_headers(
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'module.h',
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'netsplit.h',
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'sasl.h',
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'scram.h',
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'servers-idle.h',
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'servers-redirect.h',
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),
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@ -80,6 +80,18 @@ static void sasl_start(IRC_SERVER_REC *server, const char *data, const char *fro
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case SASL_MECHANISM_EXTERNAL:
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irc_send_cmd_now(server, "AUTHENTICATE EXTERNAL");
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break;
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case SASL_MECHANISM_SCRAM_SHA_1:
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irc_send_cmd_now(server, "AUTHENTICATE SCRAM-SHA-1");
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break;
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case SASL_MECHANISM_SCRAM_SHA_256:
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irc_send_cmd_now(server, "AUTHENTICATE SCRAM-SHA-256");
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break;
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case SASL_MECHANISM_SCRAM_SHA_512:
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irc_send_cmd_now(server, "AUTHENTICATE SCRAM-SHA-512");
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break;
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}
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server->sasl_timeout = g_timeout_add(SASL_TIMEOUT, (GSourceFunc) sasl_timeout, server);
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}
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@ -223,6 +235,54 @@ void sasl_send_response(IRC_SERVER_REC *server, GString *response)
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g_free(enc);
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}
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/*
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* Sends AUTHENTICATE messages to log in via SCRAM.
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*/
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static void scram_authenticate(IRC_SERVER_REC *server, const char *data, const char *digest)
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{
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char *output;
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int ret;
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size_t output_len;
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IRC_SERVER_CONNECT_REC *conn = server->connrec;
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if (conn->scram_session == NULL) {
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conn->scram_session =
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scram_session_create(digest, conn->sasl_username, conn->sasl_password);
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if (conn->scram_session == NULL) {
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g_error("Could not create SCRAM session with digest %s", digest);
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irc_send_cmd_now(server, "AUTHENTICATE *");
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return;
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}
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}
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ret = scram_process(conn->scram_session, data, &output, &output_len);
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if (ret == SCRAM_IN_PROGRESS) {
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// Authentication is still in progress
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GString *resp = g_string_new(output);
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sasl_send_response(server, resp);
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g_string_free(resp, TRUE);
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g_free(output);
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} else if (ret == SCRAM_SUCCESS) {
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// Authentication succeeded
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irc_send_cmd_now(server, "AUTHENTICATE +");
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scram_session_free(conn->scram_session);
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conn->scram_session = NULL;
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} else if (ret == SCRAM_ERROR) {
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// Authentication failed
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irc_send_cmd_now(server, "AUTHENTICATE *");
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if (conn->scram_session->error != NULL) {
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g_warning("SASL SCRAM authentication failed: %s",
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conn->scram_session->error);
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}
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scram_session_free(conn->scram_session);
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conn->scram_session = NULL;
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}
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}
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/*
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* Called when the incoming SASL request is completely received.
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*/
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@ -258,6 +318,18 @@ static void sasl_step_complete(IRC_SERVER_REC *server, GString *data)
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/* Empty response */
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sasl_send_response(server, NULL);
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break;
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case SASL_MECHANISM_SCRAM_SHA_1:
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scram_authenticate(server, data->str, "SHA1");
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break;
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case SASL_MECHANISM_SCRAM_SHA_256:
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scram_authenticate(server, data->str, "SHA256");
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break;
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case SASL_MECHANISM_SCRAM_SHA_512:
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scram_authenticate(server, data->str, "SHA512");
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break;
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}
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}
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@ -25,6 +25,9 @@ enum {
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SASL_MECHANISM_NONE = 0,
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SASL_MECHANISM_PLAIN,
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SASL_MECHANISM_EXTERNAL,
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SASL_MECHANISM_SCRAM_SHA_1,
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SASL_MECHANISM_SCRAM_SHA_256,
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SASL_MECHANISM_SCRAM_SHA_512,
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SASL_MECHANISM_MAX
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};
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303
src/irc/core/scram.c
Normal file
303
src/irc/core/scram.c
Normal file
@ -0,0 +1,303 @@
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/*
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scram.c : irssi
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Copyright (C) 2023 Patrick Okraku
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "module.h"
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#include <irssi/src/irc/core/scram.h>
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#include <openssl/hmac.h>
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#include <openssl/rand.h>
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#define NONCE_LENGTH 18
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#define CLIENT_KEY "Client Key"
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#define SERVER_KEY "Server Key"
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// EVP_MD_CTX_create() and EVP_MD_CTX_destroy() were renamed in OpenSSL 1.1.0
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#if (OPENSSL_VERSION_NUMBER < 0x10100000L)
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#define EVP_MD_CTX_new(ctx) EVP_MD_CTX_create(ctx)
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#define EVP_MD_CTX_free(ctx) EVP_MD_CTX_destroy(ctx)
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#endif
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SCRAM_SESSION_REC *scram_session_create(const char *digest, const char *username,
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const char *password)
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{
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SCRAM_SESSION_REC *session;
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const EVP_MD *md;
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#if (OPENSSL_VERSION_NUMBER < 0x10100000L)
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OpenSSL_add_all_algorithms();
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#endif
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md = EVP_get_digestbyname(digest);
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if (md == NULL) {
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// Unknown message digest
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return NULL;
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}
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session = g_new0(SCRAM_SESSION_REC, 1);
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session->digest = md;
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session->digest_size = EVP_MD_size(md);
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session->username = g_strdup(username);
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session->password = g_strdup(password);
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return session;
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}
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void scram_session_free(SCRAM_SESSION_REC *session)
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{
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if (session == NULL) {
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return;
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}
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g_free(session->username);
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g_free(session->password);
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g_free(session->client_nonce_b64);
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g_free(session->client_first_message_bare);
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g_free(session->salted_password);
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g_free(session->auth_message);
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g_free(session->error);
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g_free(session);
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}
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static int create_nonce(void *buffer, size_t length)
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{
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return RAND_bytes(buffer, length);
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}
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static int create_SHA(SCRAM_SESSION_REC *session, const unsigned char *input, size_t input_len,
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unsigned char *output, unsigned int *output_len)
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{
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EVP_MD_CTX *md_ctx = EVP_MD_CTX_new();
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if (!EVP_DigestInit_ex(md_ctx, session->digest, NULL)) {
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session->error = g_strdup("Message digest initialization failed");
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EVP_MD_CTX_free(md_ctx);
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return SCRAM_ERROR;
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}
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if (!EVP_DigestUpdate(md_ctx, input, input_len)) {
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session->error = g_strdup("Message digest update failed");
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EVP_MD_CTX_free(md_ctx);
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return SCRAM_ERROR;
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}
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if (!EVP_DigestFinal_ex(md_ctx, output, output_len)) {
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session->error = g_strdup("Message digest finalization failed");
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EVP_MD_CTX_free(md_ctx);
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return SCRAM_ERROR;
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}
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EVP_MD_CTX_free(md_ctx);
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return SCRAM_IN_PROGRESS;
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}
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static scram_status process_client_first(SCRAM_SESSION_REC *session, char **output,
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size_t *output_len)
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{
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char nonce[NONCE_LENGTH];
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if (!create_nonce(nonce, NONCE_LENGTH)) {
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session->error = g_strdup("Could not create client nonce");
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return SCRAM_ERROR;
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}
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session->client_nonce_b64 = g_base64_encode((guchar *) nonce, NONCE_LENGTH);
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*output = g_strdup_printf("n,,n=%s,r=%s", session->username, session->client_nonce_b64);
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*output_len = strlen(*output);
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session->client_first_message_bare = g_strdup(*output + 3);
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session->step++;
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return SCRAM_IN_PROGRESS;
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}
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static scram_status process_server_first(SCRAM_SESSION_REC *session, const char *data,
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char **output, size_t *output_len)
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{
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char **params, *client_final_message_without_proof, *salt, *server_nonce_b64,
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*client_proof_b64;
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unsigned char *client_key, stored_key[EVP_MAX_MD_SIZE], *client_signature, *client_proof;
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unsigned int i, param_count, iteration_count, client_key_len, stored_key_len;
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gsize salt_len = 0;
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size_t client_nonce_len;
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params = g_strsplit(data, ",", -1);
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param_count = g_strv_length(params);
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if (param_count < 3) {
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session->error = g_strdup_printf("Invalid server-first-message: %s", data);
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g_strfreev(params);
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return SCRAM_ERROR;
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}
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server_nonce_b64 = NULL;
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salt = NULL;
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iteration_count = 0;
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for (i = 0; i < param_count; i++) {
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if (!strncmp(params[i], "r=", 2)) {
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g_free(server_nonce_b64);
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server_nonce_b64 = g_strdup(params[i] + 2);
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} else if (!strncmp(params[i], "s=", 2)) {
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g_free(salt);
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salt = g_strdup(params[i] + 2);
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} else if (!strncmp(params[i], "i=", 2)) {
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iteration_count = strtoul(params[i] + 2, NULL, 10);
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}
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}
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g_strfreev(params);
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if (server_nonce_b64 == NULL || *server_nonce_b64 == '\0' || salt == NULL ||
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*salt == '\0' || iteration_count == 0) {
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session->error = g_strdup_printf("Invalid server-first-message: %s", data);
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g_free(server_nonce_b64);
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g_free(salt);
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return SCRAM_ERROR;
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}
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client_nonce_len = strlen(session->client_nonce_b64);
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// The server can append his nonce to the client's nonce
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if (strlen(server_nonce_b64) < client_nonce_len ||
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strncmp(server_nonce_b64, session->client_nonce_b64, client_nonce_len)) {
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session->error = g_strdup_printf("Invalid server nonce: %s", server_nonce_b64);
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return SCRAM_ERROR;
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}
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g_base64_decode_inplace((gchar *) salt, &salt_len);
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// SaltedPassword := Hi(Normalize(password), salt, i)
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session->salted_password = g_malloc(session->digest_size);
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PKCS5_PBKDF2_HMAC(session->password, strlen(session->password), (unsigned char *) salt,
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salt_len, iteration_count, session->digest, session->digest_size,
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session->salted_password);
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// AuthMessage := client-first-message-bare + "," +
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// server-first-message + "," +
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// client-final-message-without-proof
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client_final_message_without_proof = g_strdup_printf("c=biws,r=%s", server_nonce_b64);
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session->auth_message = g_strdup_printf("%s,%s,%s", session->client_first_message_bare,
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data, client_final_message_without_proof);
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// ClientKey := HMAC(SaltedPassword, "Client Key")
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client_key = g_malloc0(session->digest_size);
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HMAC(session->digest, session->salted_password, session->digest_size,
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(unsigned char *) CLIENT_KEY, strlen(CLIENT_KEY), client_key, &client_key_len);
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// StoredKey := H(ClientKey)
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if (!create_SHA(session, client_key, session->digest_size, stored_key, &stored_key_len)) {
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g_free(client_final_message_without_proof);
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g_free(server_nonce_b64);
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g_free(salt);
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g_free(client_key);
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return SCRAM_ERROR;
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}
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// ClientSignature := HMAC(StoredKey, AuthMessage)
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client_signature = g_malloc0(session->digest_size);
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HMAC(session->digest, stored_key, stored_key_len, (unsigned char *) session->auth_message,
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strlen((char *) session->auth_message), client_signature, NULL);
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// ClientProof := ClientKey XOR ClientSignature
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client_proof = g_malloc0(client_key_len);
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for (i = 0; i < client_key_len; i++) {
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client_proof[i] = client_key[i] ^ client_signature[i];
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}
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client_proof_b64 = g_base64_encode((guchar *) client_proof, client_key_len);
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|
||||
*output = g_strdup_printf("%s,p=%s", client_final_message_without_proof, client_proof_b64);
|
||||
*output_len = strlen(*output);
|
||||
|
||||
g_free(server_nonce_b64);
|
||||
g_free(salt);
|
||||
g_free(client_final_message_without_proof);
|
||||
g_free(client_key);
|
||||
g_free(client_signature);
|
||||
g_free(client_proof);
|
||||
g_free(client_proof_b64);
|
||||
|
||||
session->step++;
|
||||
return SCRAM_IN_PROGRESS;
|
||||
}
|
||||
|
||||
static scram_status process_server_final(SCRAM_SESSION_REC *session, const char *data)
|
||||
{
|
||||
char *verifier;
|
||||
unsigned char *server_key, *server_signature;
|
||||
unsigned int server_key_len = 0, server_signature_len = 0;
|
||||
gsize verifier_len = 0;
|
||||
|
||||
if (strlen(data) < 3 || (data[0] != 'v' && data[1] != '=')) {
|
||||
return SCRAM_ERROR;
|
||||
}
|
||||
|
||||
verifier = g_strdup(data + 2);
|
||||
g_base64_decode_inplace(verifier, &verifier_len);
|
||||
|
||||
// ServerKey := HMAC(SaltedPassword, "Server Key")
|
||||
server_key = g_malloc0(session->digest_size);
|
||||
HMAC(session->digest, session->salted_password, session->digest_size,
|
||||
(unsigned char *) SERVER_KEY, strlen(SERVER_KEY), server_key, &server_key_len);
|
||||
|
||||
// ServerSignature := HMAC(ServerKey, AuthMessage)
|
||||
server_signature = g_malloc0(session->digest_size);
|
||||
HMAC(session->digest, server_key, session->digest_size,
|
||||
(unsigned char *) session->auth_message, strlen((char *) session->auth_message),
|
||||
server_signature, &server_signature_len);
|
||||
|
||||
if (verifier_len == server_signature_len &&
|
||||
memcmp(verifier, server_signature, verifier_len) == 0) {
|
||||
g_free(verifier);
|
||||
g_free(server_key);
|
||||
g_free(server_signature);
|
||||
return SCRAM_SUCCESS;
|
||||
} else {
|
||||
g_free(verifier);
|
||||
g_free(server_key);
|
||||
g_free(server_signature);
|
||||
return SCRAM_ERROR;
|
||||
}
|
||||
}
|
||||
|
||||
scram_status scram_process(SCRAM_SESSION_REC *session, const char *input, char **output,
|
||||
size_t *output_len)
|
||||
{
|
||||
scram_status status;
|
||||
|
||||
switch (session->step) {
|
||||
case 0:
|
||||
status = process_client_first(session, output, output_len);
|
||||
break;
|
||||
case 1:
|
||||
status = process_server_first(session, input, output, output_len);
|
||||
break;
|
||||
case 2:
|
||||
status = process_server_final(session, input);
|
||||
break;
|
||||
default:
|
||||
*output = NULL;
|
||||
*output_len = 0;
|
||||
status = SCRAM_ERROR;
|
||||
break;
|
||||
}
|
||||
|
||||
return status;
|
||||
}
|
||||
27
src/irc/core/scram.h
Normal file
27
src/irc/core/scram.h
Normal file
@ -0,0 +1,27 @@
|
||||
#ifndef IRSSI_IRC_CORE_SCRAM_H
|
||||
#define IRSSI_IRC_CORE_SCRAM_H
|
||||
|
||||
#include <openssl/evp.h>
|
||||
|
||||
typedef struct {
|
||||
const EVP_MD *digest;
|
||||
size_t digest_size;
|
||||
char *username;
|
||||
char *password;
|
||||
char *client_nonce_b64;
|
||||
char *client_first_message_bare;
|
||||
unsigned char *salted_password;
|
||||
char *auth_message;
|
||||
char *error;
|
||||
int step;
|
||||
} SCRAM_SESSION_REC;
|
||||
|
||||
typedef enum { SCRAM_ERROR = 0, SCRAM_IN_PROGRESS, SCRAM_SUCCESS } scram_status;
|
||||
|
||||
SCRAM_SESSION_REC *scram_session_create(const char *digset, const char *username,
|
||||
const char *password);
|
||||
void scram_session_free(SCRAM_SESSION_REC *session);
|
||||
scram_status scram_process(SCRAM_SESSION_REC *session, const char *input, char **output,
|
||||
size_t *output_len);
|
||||
|
||||
#endif
|
||||
Loading…
x
Reference in New Issue
Block a user