900 lines
24 KiB
C
900 lines
24 KiB
C
/*-
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* Copyright (c) 2012 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Edward Tomasz Napierala under sponsorship
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* from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <assert.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <netinet/in.h>
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#include <openssl/err.h>
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#include <openssl/md5.h>
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#include <openssl/rand.h>
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#include "iscsid.h"
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#include "iscsi_proto.h"
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static int
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login_nsg(const struct pdu *response)
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{
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struct iscsi_bhs_login_response *bhslr;
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bhslr = (struct iscsi_bhs_login_response *)response->pdu_bhs;
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return (bhslr->bhslr_flags & 0x03);
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}
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static void
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login_set_nsg(struct pdu *request, int nsg)
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{
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struct iscsi_bhs_login_request *bhslr;
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assert(nsg == BHSLR_STAGE_SECURITY_NEGOTIATION ||
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nsg == BHSLR_STAGE_OPERATIONAL_NEGOTIATION ||
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nsg == BHSLR_STAGE_FULL_FEATURE_PHASE);
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bhslr = (struct iscsi_bhs_login_request *)request->pdu_bhs;
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bhslr->bhslr_flags &= 0xFC;
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bhslr->bhslr_flags |= nsg;
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}
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static void
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login_set_csg(struct pdu *request, int csg)
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{
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struct iscsi_bhs_login_request *bhslr;
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assert(csg == BHSLR_STAGE_SECURITY_NEGOTIATION ||
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csg == BHSLR_STAGE_OPERATIONAL_NEGOTIATION ||
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csg == BHSLR_STAGE_FULL_FEATURE_PHASE);
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bhslr = (struct iscsi_bhs_login_request *)request->pdu_bhs;
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bhslr->bhslr_flags &= 0xF3;
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bhslr->bhslr_flags |= csg << 2;
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}
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static const char *
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login_target_error_str(int class, int detail)
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{
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static char msg[128];
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/*
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* RFC 3270, 10.13.5. Status-Class and Status-Detail
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*/
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switch (class) {
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case 0x01:
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switch (detail) {
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case 0x01:
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return ("Target moved temporarily");
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case 0x02:
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return ("Target moved permanently");
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default:
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snprintf(msg, sizeof(msg), "unknown redirection; "
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"Status-Class 0x%x, Status-Detail 0x%x",
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class, detail);
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return (msg);
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}
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case 0x02:
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switch (detail) {
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case 0x00:
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return ("Initiator error");
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case 0x01:
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return ("Authentication failure");
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case 0x02:
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return ("Authorization failure");
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case 0x03:
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return ("Not found");
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case 0x04:
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return ("Target removed");
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case 0x05:
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return ("Unsupported version");
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case 0x06:
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return ("Too many connections");
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case 0x07:
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return ("Missing parameter");
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case 0x08:
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return ("Can't include in session");
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case 0x09:
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return ("Session type not supported");
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case 0x0a:
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return ("Session does not exist");
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case 0x0b:
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return ("Invalid during login");
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default:
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snprintf(msg, sizeof(msg), "unknown initiator error; "
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"Status-Class 0x%x, Status-Detail 0x%x",
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class, detail);
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return (msg);
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}
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case 0x03:
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switch (detail) {
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case 0x00:
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return ("Target error");
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case 0x01:
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return ("Service unavailable");
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case 0x02:
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return ("Out of resources");
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default:
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snprintf(msg, sizeof(msg), "unknown target error; "
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"Status-Class 0x%x, Status-Detail 0x%x",
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class, detail);
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return (msg);
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}
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default:
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snprintf(msg, sizeof(msg), "unknown error; "
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"Status-Class 0x%x, Status-Detail 0x%x",
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class, detail);
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return (msg);
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}
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}
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static struct pdu *
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login_receive(struct connection *conn, bool initial)
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{
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struct pdu *response;
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struct iscsi_bhs_login_response *bhslr;
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const char *errorstr;
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response = pdu_new(conn);
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pdu_receive(response);
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if (response->pdu_bhs->bhs_opcode != ISCSI_BHS_OPCODE_LOGIN_RESPONSE) {
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log_errx(1, "protocol error: received invalid opcode 0x%x",
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response->pdu_bhs->bhs_opcode);
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}
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bhslr = (struct iscsi_bhs_login_response *)response->pdu_bhs;
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/*
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* XXX: Implement the C flag some day.
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*/
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if ((bhslr->bhslr_flags & BHSLR_FLAGS_CONTINUE) != 0)
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log_errx(1, "received Login PDU with unsupported \"C\" flag");
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if (bhslr->bhslr_version_max != 0x00)
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log_errx(1, "received Login PDU with unsupported "
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"Version-max 0x%x", bhslr->bhslr_version_max);
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if (bhslr->bhslr_version_active != 0x00)
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log_errx(1, "received Login PDU with unsupported "
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"Version-active 0x%x", bhslr->bhslr_version_active);
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if (bhslr->bhslr_status_class != 0) {
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errorstr = login_target_error_str(bhslr->bhslr_status_class,
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bhslr->bhslr_status_detail);
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fail(conn, errorstr);
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log_errx(1, "target returned error: %s", errorstr);
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}
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if (initial == false &&
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ntohl(bhslr->bhslr_statsn) != conn->conn_statsn + 1) {
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/*
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* It's a warning, not an error, to work around what seems
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* to be bug in NetBSD iSCSI target.
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*/
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log_warnx("received Login PDU with wrong StatSN: "
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"is %d, should be %d", ntohl(bhslr->bhslr_statsn),
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conn->conn_statsn + 1);
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}
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conn->conn_statsn = ntohl(bhslr->bhslr_statsn);
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return (response);
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}
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static struct pdu *
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login_new_request(struct connection *conn)
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{
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struct pdu *request;
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struct iscsi_bhs_login_request *bhslr;
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request = pdu_new(conn);
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bhslr = (struct iscsi_bhs_login_request *)request->pdu_bhs;
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bhslr->bhslr_opcode = ISCSI_BHS_OPCODE_LOGIN_REQUEST |
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ISCSI_BHS_OPCODE_IMMEDIATE;
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bhslr->bhslr_flags = BHSLR_FLAGS_TRANSIT;
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login_set_csg(request, BHSLR_STAGE_SECURITY_NEGOTIATION);
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login_set_nsg(request, BHSLR_STAGE_OPERATIONAL_NEGOTIATION);
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memcpy(bhslr->bhslr_isid, &conn->conn_isid, sizeof(bhslr->bhslr_isid));
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bhslr->bhslr_initiator_task_tag = 0;
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bhslr->bhslr_cmdsn = 0;
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bhslr->bhslr_expstatsn = htonl(conn->conn_statsn + 1);
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return (request);
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}
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static int
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login_list_prefers(const char *list,
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const char *choice1, const char *choice2)
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{
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char *tofree, *str, *token;
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tofree = str = checked_strdup(list);
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while ((token = strsep(&str, ",")) != NULL) {
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if (strcmp(token, choice1) == 0) {
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free(tofree);
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return (1);
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}
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if (strcmp(token, choice2) == 0) {
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free(tofree);
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return (2);
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}
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}
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free(tofree);
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return (-1);
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}
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static int
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login_hex2int(const char hex)
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{
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switch (hex) {
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case '0':
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return (0x00);
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case '1':
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return (0x01);
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case '2':
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return (0x02);
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case '3':
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return (0x03);
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case '4':
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return (0x04);
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case '5':
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return (0x05);
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case '6':
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return (0x06);
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case '7':
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return (0x07);
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case '8':
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return (0x08);
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case '9':
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return (0x09);
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case 'a':
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case 'A':
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return (0x0a);
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case 'b':
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case 'B':
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return (0x0b);
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case 'c':
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case 'C':
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return (0x0c);
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case 'd':
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case 'D':
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return (0x0d);
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case 'e':
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case 'E':
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return (0x0e);
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case 'f':
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case 'F':
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return (0x0f);
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default:
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return (-1);
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}
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}
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/*
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* XXX: Review this _carefully_.
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*/
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static int
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login_hex2bin(const char *hex, char **binp, size_t *bin_lenp)
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{
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int i, hex_len, nibble;
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bool lo = true; /* As opposed to 'hi'. */
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char *bin;
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size_t bin_off, bin_len;
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if (strncasecmp(hex, "0x", strlen("0x")) != 0) {
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log_warnx("malformed variable, should start with \"0x\"");
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return (-1);
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}
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hex += strlen("0x");
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hex_len = strlen(hex);
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if (hex_len < 1) {
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log_warnx("malformed variable; doesn't contain anything "
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"but \"0x\"");
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return (-1);
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}
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bin_len = hex_len / 2 + hex_len % 2;
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bin = calloc(bin_len, 1);
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if (bin == NULL)
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log_err(1, "calloc");
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bin_off = bin_len - 1;
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for (i = hex_len - 1; i >= 0; i--) {
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nibble = login_hex2int(hex[i]);
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if (nibble < 0) {
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log_warnx("malformed variable, invalid char \"%c\"",
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hex[i]);
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return (-1);
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}
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assert(bin_off < bin_len);
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if (lo) {
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bin[bin_off] = nibble;
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lo = false;
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} else {
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bin[bin_off] |= nibble << 4;
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bin_off--;
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lo = true;
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}
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}
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*binp = bin;
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*bin_lenp = bin_len;
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return (0);
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}
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static char *
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login_bin2hex(const char *bin, size_t bin_len)
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{
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unsigned char *hex, *tmp, ch;
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size_t hex_len;
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size_t i;
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hex_len = bin_len * 2 + 3; /* +2 for "0x", +1 for '\0'. */
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hex = malloc(hex_len);
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if (hex == NULL)
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log_err(1, "malloc");
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tmp = hex;
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tmp += sprintf(tmp, "0x");
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for (i = 0; i < bin_len; i++) {
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ch = bin[i];
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tmp += sprintf(tmp, "%02x", ch);
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}
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return (hex);
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}
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static void
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login_compute_md5(const char id, const char *secret,
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const void *challenge, size_t challenge_len, void *response,
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size_t response_len)
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{
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MD5_CTX ctx;
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int rv;
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assert(response_len == MD5_DIGEST_LENGTH);
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MD5_Init(&ctx);
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MD5_Update(&ctx, &id, sizeof(id));
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MD5_Update(&ctx, secret, strlen(secret));
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MD5_Update(&ctx, challenge, challenge_len);
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rv = MD5_Final(response, &ctx);
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if (rv != 1)
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log_errx(1, "MD5_Final");
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}
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static void
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login_negotiate_key(struct connection *conn, const char *name,
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const char *value)
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{
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int which, tmp;
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if (strcmp(name, "TargetAlias") == 0) {
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strlcpy(conn->conn_target_alias, value,
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sizeof(conn->conn_target_alias));
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} else if (strcmp(value, "Irrelevant") == 0) {
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/* Ignore. */
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} else if (strcmp(name, "HeaderDigest") == 0) {
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which = login_list_prefers(value, "CRC32C", "None");
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switch (which) {
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case 1:
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log_debugx("target prefers CRC32C "
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"for header digest; we'll use it");
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conn->conn_header_digest = CONN_DIGEST_CRC32C;
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break;
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case 2:
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log_debugx("target prefers not to do "
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"header digest; we'll comply");
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break;
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default:
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log_warnx("target sent unrecognized "
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"HeaderDigest value \"%s\"; will use None", value);
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break;
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}
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} else if (strcmp(name, "DataDigest") == 0) {
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which = login_list_prefers(value, "CRC32C", "None");
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switch (which) {
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case 1:
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log_debugx("target prefers CRC32C "
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"for data digest; we'll use it");
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conn->conn_data_digest = CONN_DIGEST_CRC32C;
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break;
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case 2:
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log_debugx("target prefers not to do "
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"data digest; we'll comply");
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break;
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default:
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log_warnx("target sent unrecognized "
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"DataDigest value \"%s\"; will use None", value);
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break;
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}
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} else if (strcmp(name, "MaxConnections") == 0) {
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/* Ignore. */
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} else if (strcmp(name, "InitialR2T") == 0) {
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if (strcmp(value, "Yes") == 0)
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conn->conn_initial_r2t = true;
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else
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conn->conn_initial_r2t = false;
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} else if (strcmp(name, "ImmediateData") == 0) {
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if (strcmp(value, "Yes") == 0)
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conn->conn_immediate_data = true;
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else
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conn->conn_immediate_data = false;
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} else if (strcmp(name, "MaxRecvDataSegmentLength") == 0) {
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tmp = strtoul(value, NULL, 10);
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if (tmp <= 0)
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log_errx(1, "received invalid "
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"MaxRecvDataSegmentLength");
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conn->conn_max_data_segment_length = tmp;
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} else if (strcmp(name, "MaxBurstLength") == 0) {
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if (conn->conn_immediate_data) {
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tmp = strtoul(value, NULL, 10);
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if (tmp <= 0)
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log_errx(1, "received invalid MaxBurstLength");
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conn->conn_max_burst_length = tmp;
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}
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} else if (strcmp(name, "FirstBurstLength") == 0) {
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tmp = strtoul(value, NULL, 10);
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if (tmp <= 0)
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log_errx(1, "received invalid FirstBurstLength");
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conn->conn_first_burst_length = tmp;
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} else if (strcmp(name, "DefaultTime2Wait") == 0) {
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/* Ignore */
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} else if (strcmp(name, "DefaultTime2Retain") == 0) {
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/* Ignore */
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} else if (strcmp(name, "MaxOutstandingR2T") == 0) {
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/* Ignore */
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} else if (strcmp(name, "DataPDUInOrder") == 0) {
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/* Ignore */
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} else if (strcmp(name, "DataSequenceInOrder") == 0) {
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/* Ignore */
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} else if (strcmp(name, "ErrorRecoveryLevel") == 0) {
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/* Ignore */
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} else if (strcmp(name, "OFMarker") == 0) {
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/* Ignore */
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} else if (strcmp(name, "IFMarker") == 0) {
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/* Ignore */
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} else if (strcmp(name, "TargetPortalGroupTag") == 0) {
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/* Ignore */
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} else {
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log_debugx("unknown key \"%s\"; ignoring", name);
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}
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}
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static void
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login_negotiate(struct connection *conn)
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{
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struct pdu *request, *response;
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struct keys *request_keys, *response_keys;
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struct iscsi_bhs_login_response *bhslr;
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int i;
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log_debugx("beginning operational parameter negotiation");
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request = login_new_request(conn);
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login_set_csg(request, BHSLR_STAGE_OPERATIONAL_NEGOTIATION);
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login_set_nsg(request, BHSLR_STAGE_FULL_FEATURE_PHASE);
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request_keys = keys_new();
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/*
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* The following keys are irrelevant for discovery sessions.
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*/
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if (conn->conn_conf.isc_discovery == 0) {
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if (conn->conn_conf.isc_header_digest != 0)
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keys_add(request_keys, "HeaderDigest", "CRC32C");
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else
|
|
keys_add(request_keys, "HeaderDigest", "None");
|
|
if (conn->conn_conf.isc_data_digest != 0)
|
|
keys_add(request_keys, "DataDigest", "CRC32C");
|
|
else
|
|
keys_add(request_keys, "DataDigest", "None");
|
|
|
|
keys_add(request_keys, "ImmediateData", "Yes");
|
|
keys_add_int(request_keys, "MaxBurstLength",
|
|
ISCSI_MAX_DATA_SEGMENT_LENGTH);
|
|
keys_add_int(request_keys, "FirstBurstLength",
|
|
ISCSI_MAX_DATA_SEGMENT_LENGTH);
|
|
keys_add(request_keys, "InitialR2T", "Yes");
|
|
} else {
|
|
keys_add(request_keys, "HeaderDigest", "None");
|
|
keys_add(request_keys, "DataDigest", "None");
|
|
}
|
|
|
|
keys_add_int(request_keys, "MaxRecvDataSegmentLength",
|
|
ISCSI_MAX_DATA_SEGMENT_LENGTH);
|
|
keys_add(request_keys, "DefaultTime2Wait", "0");
|
|
keys_add(request_keys, "DefaultTime2Retain", "0");
|
|
keys_add(request_keys, "ErrorRecoveryLevel", "0");
|
|
keys_add(request_keys, "MaxOutstandingR2T", "1");
|
|
keys_save(request_keys, request);
|
|
keys_delete(request_keys);
|
|
request_keys = NULL;
|
|
pdu_send(request);
|
|
pdu_delete(request);
|
|
request = NULL;
|
|
|
|
response = login_receive(conn, false);
|
|
response_keys = keys_new();
|
|
keys_load(response_keys, response);
|
|
for (i = 0; i < KEYS_MAX; i++) {
|
|
if (response_keys->keys_names[i] == NULL)
|
|
break;
|
|
|
|
login_negotiate_key(conn,
|
|
response_keys->keys_names[i], response_keys->keys_values[i]);
|
|
}
|
|
|
|
bhslr = (struct iscsi_bhs_login_response *)response->pdu_bhs;
|
|
if ((bhslr->bhslr_flags & BHSLR_FLAGS_TRANSIT) == 0)
|
|
log_warnx("received final login response "
|
|
"without the \"T\" flag");
|
|
else if (login_nsg(response) != BHSLR_STAGE_FULL_FEATURE_PHASE)
|
|
log_warnx("received final login response with wrong NSG 0x%x",
|
|
login_nsg(response));
|
|
|
|
log_debugx("operational parameter negotiation done; "
|
|
"transitioning to Full Feature phase");
|
|
|
|
keys_delete(response_keys);
|
|
pdu_delete(response);
|
|
}
|
|
|
|
static void
|
|
login_send_chap_a(struct connection *conn)
|
|
{
|
|
struct pdu *request;
|
|
struct keys *request_keys;
|
|
|
|
request = login_new_request(conn);
|
|
request_keys = keys_new();
|
|
keys_add(request_keys, "CHAP_A", "5");
|
|
keys_save(request_keys, request);
|
|
keys_delete(request_keys);
|
|
pdu_send(request);
|
|
pdu_delete(request);
|
|
}
|
|
|
|
static void
|
|
login_send_chap_r(struct pdu *response)
|
|
{
|
|
struct connection *conn;
|
|
struct pdu *request;
|
|
struct keys *request_keys, *response_keys;
|
|
const char *chap_a, *chap_c, *chap_i;
|
|
char *chap_r, *challenge, response_bin[MD5_DIGEST_LENGTH];
|
|
size_t challenge_len;
|
|
int error, rv;
|
|
unsigned char id;
|
|
char *mutual_chap_c, mutual_chap_i[4];
|
|
|
|
/*
|
|
* As in the rest of the initiator, 'request' means
|
|
* 'initiator -> target', and 'response' means 'target -> initiator',
|
|
*
|
|
* So, here the 'response' from the target is the packet that contains
|
|
* CHAP challenge; our CHAP response goes into 'request'.
|
|
*/
|
|
|
|
conn = response->pdu_connection;
|
|
|
|
response_keys = keys_new();
|
|
keys_load(response_keys, response);
|
|
|
|
/*
|
|
* First, compute the response.
|
|
*/
|
|
chap_a = keys_find(response_keys, "CHAP_A");
|
|
if (chap_a == NULL)
|
|
log_errx(1, "received CHAP packet without CHAP_A");
|
|
chap_c = keys_find(response_keys, "CHAP_C");
|
|
if (chap_c == NULL)
|
|
log_errx(1, "received CHAP packet without CHAP_C");
|
|
chap_i = keys_find(response_keys, "CHAP_I");
|
|
if (chap_i == NULL)
|
|
log_errx(1, "received CHAP packet without CHAP_I");
|
|
|
|
if (strcmp(chap_a, "5") != 0)
|
|
log_errx(1, "received CHAP packet "
|
|
"with unsupported CHAP_A \"%s\"", chap_a);
|
|
id = strtoul(chap_i, NULL, 10);
|
|
error = login_hex2bin(chap_c, &challenge, &challenge_len);
|
|
if (error != 0)
|
|
log_errx(1, "received CHAP packet with malformed CHAP_C");
|
|
login_compute_md5(id, conn->conn_conf.isc_secret,
|
|
challenge, challenge_len, response_bin, sizeof(response_bin));
|
|
free(challenge);
|
|
chap_r = login_bin2hex(response_bin, sizeof(response_bin));
|
|
|
|
keys_delete(response_keys);
|
|
|
|
request = login_new_request(conn);
|
|
request_keys = keys_new();
|
|
keys_add(request_keys, "CHAP_N", conn->conn_conf.isc_user);
|
|
keys_add(request_keys, "CHAP_R", chap_r);
|
|
free(chap_r);
|
|
|
|
/*
|
|
* If we want mutual authentication, we're expected to send
|
|
* our CHAP_I/CHAP_C now.
|
|
*/
|
|
if (conn->conn_conf.isc_mutual_user[0] != '\0') {
|
|
log_debugx("requesting mutual authentication; "
|
|
"binary challenge size is %zd bytes",
|
|
sizeof(conn->conn_mutual_challenge));
|
|
|
|
rv = RAND_bytes(conn->conn_mutual_challenge,
|
|
sizeof(conn->conn_mutual_challenge));
|
|
if (rv != 1) {
|
|
log_errx(1, "RAND_bytes failed: %s",
|
|
ERR_error_string(ERR_get_error(), NULL));
|
|
}
|
|
rv = RAND_bytes(&conn->conn_mutual_id,
|
|
sizeof(conn->conn_mutual_id));
|
|
if (rv != 1) {
|
|
log_errx(1, "RAND_bytes failed: %s",
|
|
ERR_error_string(ERR_get_error(), NULL));
|
|
}
|
|
mutual_chap_c = login_bin2hex(conn->conn_mutual_challenge,
|
|
sizeof(conn->conn_mutual_challenge));
|
|
snprintf(mutual_chap_i, sizeof(mutual_chap_i),
|
|
"%d", conn->conn_mutual_id);
|
|
keys_add(request_keys, "CHAP_I", mutual_chap_i);
|
|
keys_add(request_keys, "CHAP_C", mutual_chap_c);
|
|
free(mutual_chap_c);
|
|
}
|
|
|
|
keys_save(request_keys, request);
|
|
keys_delete(request_keys);
|
|
pdu_send(request);
|
|
pdu_delete(request);
|
|
}
|
|
|
|
static void
|
|
login_verify_mutual(const struct pdu *response)
|
|
{
|
|
struct connection *conn;
|
|
struct keys *response_keys;
|
|
const char *chap_n, *chap_r;
|
|
char *response_bin, expected_response_bin[MD5_DIGEST_LENGTH];
|
|
size_t response_bin_len;
|
|
int error;
|
|
|
|
conn = response->pdu_connection;
|
|
|
|
response_keys = keys_new();
|
|
keys_load(response_keys, response);
|
|
|
|
chap_n = keys_find(response_keys, "CHAP_N");
|
|
if (chap_n == NULL)
|
|
log_errx(1, "received CHAP Response PDU without CHAP_N");
|
|
chap_r = keys_find(response_keys, "CHAP_R");
|
|
if (chap_r == NULL)
|
|
log_errx(1, "received CHAP Response PDU without CHAP_R");
|
|
error = login_hex2bin(chap_r, &response_bin, &response_bin_len);
|
|
if (error != 0)
|
|
log_errx(1, "received CHAP Response PDU with malformed CHAP_R");
|
|
|
|
if (strcmp(chap_n, conn->conn_conf.isc_mutual_user) != 0) {
|
|
fail(conn, "Mutual CHAP failed");
|
|
log_errx(1, "mutual CHAP authentication failed: wrong user");
|
|
}
|
|
|
|
login_compute_md5(conn->conn_mutual_id,
|
|
conn->conn_conf.isc_mutual_secret, conn->conn_mutual_challenge,
|
|
sizeof(conn->conn_mutual_challenge), expected_response_bin,
|
|
sizeof(expected_response_bin));
|
|
|
|
if (memcmp(response_bin, expected_response_bin,
|
|
sizeof(expected_response_bin)) != 0) {
|
|
fail(conn, "Mutual CHAP failed");
|
|
log_errx(1, "mutual CHAP authentication failed: wrong secret");
|
|
}
|
|
|
|
keys_delete(response_keys);
|
|
free(response_bin);
|
|
|
|
log_debugx("mutual CHAP authentication succeeded");
|
|
}
|
|
|
|
static void
|
|
login_chap(struct connection *conn)
|
|
{
|
|
struct pdu *response;
|
|
|
|
log_debugx("beginning CHAP authentication; sending CHAP_A");
|
|
login_send_chap_a(conn);
|
|
|
|
log_debugx("waiting for CHAP_A/CHAP_C/CHAP_I");
|
|
response = login_receive(conn, false);
|
|
|
|
log_debugx("sending CHAP_N/CHAP_R");
|
|
login_send_chap_r(response);
|
|
pdu_delete(response);
|
|
|
|
/*
|
|
* XXX: Make sure this is not susceptible to MITM.
|
|
*/
|
|
|
|
log_debugx("waiting for CHAP result");
|
|
response = login_receive(conn, false);
|
|
if (conn->conn_conf.isc_mutual_user[0] != '\0')
|
|
login_verify_mutual(response);
|
|
pdu_delete(response);
|
|
|
|
log_debugx("CHAP authentication done");
|
|
}
|
|
|
|
static void
|
|
login_create_isid(struct connection *conn)
|
|
{
|
|
int rv;
|
|
|
|
/*
|
|
* RFC 3720, 10.12.5: 10b, "Random" ISID.
|
|
*
|
|
*/
|
|
conn->conn_isid[0] = 0x80;
|
|
|
|
rv = RAND_bytes(&conn->conn_isid[1], 3);
|
|
if (rv != 1) {
|
|
log_errx(1, "RAND_bytes failed: %s",
|
|
ERR_error_string(ERR_get_error(), NULL));
|
|
}
|
|
}
|
|
|
|
void
|
|
login(struct connection *conn)
|
|
{
|
|
struct pdu *request, *response;
|
|
struct keys *request_keys, *response_keys;
|
|
struct iscsi_bhs_login_response *bhslr2;
|
|
const char *auth_method;
|
|
int i;
|
|
|
|
login_create_isid(conn);
|
|
|
|
log_debugx("beginning Login phase; sending Login PDU");
|
|
request = login_new_request(conn);
|
|
request_keys = keys_new();
|
|
if (conn->conn_conf.isc_mutual_user[0] != '\0') {
|
|
keys_add(request_keys, "AuthMethod", "CHAP");
|
|
} else if (conn->conn_conf.isc_user[0] != '\0') {
|
|
/*
|
|
* Give target a chance to skip authentication if it
|
|
* doesn't feel like it.
|
|
*
|
|
* None is first, CHAP second; this is to work around
|
|
* what seems to be LIO (Linux target) bug: otherwise,
|
|
* if target is configured with no authentication,
|
|
* and we are configured to authenticate, the target
|
|
* will erroneously respond with AuthMethod=CHAP
|
|
* instead of AuthMethod=None, and will subsequently
|
|
* fail the connection. This usually happens with
|
|
* Discovery sessions, which default to no authentication.
|
|
*/
|
|
keys_add(request_keys, "AuthMethod", "None,CHAP");
|
|
} else {
|
|
keys_add(request_keys, "AuthMethod", "None");
|
|
}
|
|
keys_add(request_keys, "InitiatorName",
|
|
conn->conn_conf.isc_initiator);
|
|
if (conn->conn_conf.isc_initiator_alias[0] != '\0') {
|
|
keys_add(request_keys, "InitiatorAlias",
|
|
conn->conn_conf.isc_initiator_alias);
|
|
}
|
|
if (conn->conn_conf.isc_discovery == 0) {
|
|
keys_add(request_keys, "SessionType", "Normal");
|
|
keys_add(request_keys,
|
|
"TargetName", conn->conn_conf.isc_target);
|
|
} else {
|
|
keys_add(request_keys, "SessionType", "Discovery");
|
|
}
|
|
keys_save(request_keys, request);
|
|
keys_delete(request_keys);
|
|
pdu_send(request);
|
|
pdu_delete(request);
|
|
|
|
response = login_receive(conn, true);
|
|
|
|
response_keys = keys_new();
|
|
keys_load(response_keys, response);
|
|
|
|
for (i = 0; i < KEYS_MAX; i++) {
|
|
if (response_keys->keys_names[i] == NULL)
|
|
break;
|
|
|
|
/*
|
|
* Not interested in AuthMethod at this point; we only need
|
|
* to parse things such as TargetAlias.
|
|
*
|
|
* XXX: This is somewhat ugly. We should have a way to apply
|
|
* all the keys to the session and use that by default
|
|
* instead of discarding them.
|
|
*/
|
|
if (strcmp(response_keys->keys_names[i], "AuthMethod") == 0)
|
|
continue;
|
|
|
|
login_negotiate_key(conn,
|
|
response_keys->keys_names[i], response_keys->keys_values[i]);
|
|
}
|
|
|
|
bhslr2 = (struct iscsi_bhs_login_response *)response->pdu_bhs;
|
|
if ((bhslr2->bhslr_flags & BHSLR_FLAGS_TRANSIT) != 0 &&
|
|
login_nsg(response) == BHSLR_STAGE_OPERATIONAL_NEGOTIATION) {
|
|
if (conn->conn_conf.isc_mutual_user[0] != '\0') {
|
|
log_errx(1, "target requested transition "
|
|
"to operational parameter negotiation, "
|
|
"but we require mutual CHAP");
|
|
}
|
|
|
|
log_debugx("target requested transition "
|
|
"to operational parameter negotiation");
|
|
keys_delete(response_keys);
|
|
pdu_delete(response);
|
|
login_negotiate(conn);
|
|
return;
|
|
}
|
|
|
|
auth_method = keys_find(response_keys, "AuthMethod");
|
|
if (auth_method == NULL)
|
|
log_errx(1, "received response without AuthMethod");
|
|
if (strcmp(auth_method, "None") == 0) {
|
|
if (conn->conn_conf.isc_mutual_user[0] != '\0') {
|
|
log_errx(1, "target does not require authantication, "
|
|
"but we require mutual CHAP");
|
|
}
|
|
|
|
log_debugx("target does not require authentication");
|
|
keys_delete(response_keys);
|
|
pdu_delete(response);
|
|
login_negotiate(conn);
|
|
return;
|
|
}
|
|
|
|
if (strcmp(auth_method, "CHAP") != 0) {
|
|
fail(conn, "Unsupported AuthMethod");
|
|
log_errx(1, "received response "
|
|
"with unsupported AuthMethod \"%s\"", auth_method);
|
|
}
|
|
|
|
if (conn->conn_conf.isc_user[0] == '\0' ||
|
|
conn->conn_conf.isc_secret[0] == '\0') {
|
|
fail(conn, "Authentication required");
|
|
log_errx(1, "target requests CHAP authentication, but we don't "
|
|
"have user and secret");
|
|
}
|
|
|
|
keys_delete(response_keys);
|
|
response_keys = NULL;
|
|
pdu_delete(response);
|
|
response = NULL;
|
|
|
|
login_chap(conn);
|
|
login_negotiate(conn);
|
|
}
|