mirror of
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78a89597fe
MFC after: 1 month Sponsored by: The FreeBSD Foundation
337 lines
10 KiB
C
337 lines
10 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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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <assert.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 <netdb.h>
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#include <sys/socket.h>
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#include "ctld.h"
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#include "iscsi_proto.h"
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static struct pdu *
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text_receive(struct connection *conn)
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{
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struct pdu *request;
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struct iscsi_bhs_text_request *bhstr;
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request = pdu_new(conn);
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pdu_receive(request);
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if ((request->pdu_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) !=
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ISCSI_BHS_OPCODE_TEXT_REQUEST)
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log_errx(1, "protocol error: received invalid opcode 0x%x",
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request->pdu_bhs->bhs_opcode);
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bhstr = (struct iscsi_bhs_text_request *)request->pdu_bhs;
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#if 0
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if ((bhstr->bhstr_flags & ISCSI_BHSTR_FLAGS_FINAL) == 0)
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log_errx(1, "received Text PDU without the \"F\" flag");
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#endif
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/*
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* XXX: Implement the C flag some day.
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*/
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if ((bhstr->bhstr_flags & BHSTR_FLAGS_CONTINUE) != 0)
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log_errx(1, "received Text PDU with unsupported \"C\" flag");
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if (ISCSI_SNLT(ntohl(bhstr->bhstr_cmdsn), conn->conn_cmdsn)) {
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log_errx(1, "received Text PDU with decreasing CmdSN: "
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"was %u, is %u", conn->conn_cmdsn, ntohl(bhstr->bhstr_cmdsn));
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}
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if (ntohl(bhstr->bhstr_expstatsn) != conn->conn_statsn) {
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log_errx(1, "received Text PDU with wrong ExpStatSN: "
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"is %u, should be %u", ntohl(bhstr->bhstr_expstatsn),
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conn->conn_statsn);
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}
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conn->conn_cmdsn = ntohl(bhstr->bhstr_cmdsn);
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if ((bhstr->bhstr_opcode & ISCSI_BHS_OPCODE_IMMEDIATE) == 0)
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conn->conn_cmdsn++;
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return (request);
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}
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static struct pdu *
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text_new_response(struct pdu *request)
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{
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struct pdu *response;
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struct connection *conn;
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struct iscsi_bhs_text_request *bhstr;
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struct iscsi_bhs_text_response *bhstr2;
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bhstr = (struct iscsi_bhs_text_request *)request->pdu_bhs;
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conn = request->pdu_connection;
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response = pdu_new_response(request);
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bhstr2 = (struct iscsi_bhs_text_response *)response->pdu_bhs;
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bhstr2->bhstr_opcode = ISCSI_BHS_OPCODE_TEXT_RESPONSE;
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bhstr2->bhstr_flags = BHSTR_FLAGS_FINAL;
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bhstr2->bhstr_lun = bhstr->bhstr_lun;
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bhstr2->bhstr_initiator_task_tag = bhstr->bhstr_initiator_task_tag;
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bhstr2->bhstr_target_transfer_tag = bhstr->bhstr_target_transfer_tag;
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bhstr2->bhstr_statsn = htonl(conn->conn_statsn++);
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bhstr2->bhstr_expcmdsn = htonl(conn->conn_cmdsn);
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bhstr2->bhstr_maxcmdsn = htonl(conn->conn_cmdsn);
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return (response);
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}
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static struct pdu *
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logout_receive(struct connection *conn)
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{
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struct pdu *request;
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struct iscsi_bhs_logout_request *bhslr;
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request = pdu_new(conn);
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pdu_receive(request);
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if ((request->pdu_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) !=
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ISCSI_BHS_OPCODE_LOGOUT_REQUEST)
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log_errx(1, "protocol error: received invalid opcode 0x%x",
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request->pdu_bhs->bhs_opcode);
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bhslr = (struct iscsi_bhs_logout_request *)request->pdu_bhs;
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if ((bhslr->bhslr_reason & 0x7f) != BHSLR_REASON_CLOSE_SESSION)
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log_debugx("received Logout PDU with invalid reason 0x%x; "
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"continuing anyway", bhslr->bhslr_reason & 0x7f);
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if (ISCSI_SNLT(ntohl(bhslr->bhslr_cmdsn), conn->conn_cmdsn)) {
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log_errx(1, "received Logout PDU with decreasing CmdSN: "
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"was %u, is %u", conn->conn_cmdsn,
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ntohl(bhslr->bhslr_cmdsn));
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}
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if (ntohl(bhslr->bhslr_expstatsn) != conn->conn_statsn) {
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log_errx(1, "received Logout PDU with wrong ExpStatSN: "
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"is %u, should be %u", ntohl(bhslr->bhslr_expstatsn),
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conn->conn_statsn);
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}
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conn->conn_cmdsn = ntohl(bhslr->bhslr_cmdsn);
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if ((bhslr->bhslr_opcode & ISCSI_BHS_OPCODE_IMMEDIATE) == 0)
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conn->conn_cmdsn++;
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return (request);
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}
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static struct pdu *
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logout_new_response(struct pdu *request)
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{
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struct pdu *response;
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struct connection *conn;
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struct iscsi_bhs_logout_request *bhslr;
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struct iscsi_bhs_logout_response *bhslr2;
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bhslr = (struct iscsi_bhs_logout_request *)request->pdu_bhs;
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conn = request->pdu_connection;
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response = pdu_new_response(request);
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bhslr2 = (struct iscsi_bhs_logout_response *)response->pdu_bhs;
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bhslr2->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_RESPONSE;
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bhslr2->bhslr_flags = 0x80;
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bhslr2->bhslr_response = BHSLR_RESPONSE_CLOSED_SUCCESSFULLY;
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bhslr2->bhslr_initiator_task_tag = bhslr->bhslr_initiator_task_tag;
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bhslr2->bhslr_statsn = htonl(conn->conn_statsn++);
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bhslr2->bhslr_expcmdsn = htonl(conn->conn_cmdsn);
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bhslr2->bhslr_maxcmdsn = htonl(conn->conn_cmdsn);
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return (response);
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}
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static void
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discovery_add_target(struct keys *response_keys, const struct target *targ)
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{
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struct port *port;
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struct portal *portal;
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char *buf;
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char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
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struct addrinfo *ai;
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int ret;
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keys_add(response_keys, "TargetName", targ->t_name);
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TAILQ_FOREACH(port, &targ->t_ports, p_ts) {
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if (port->p_portal_group == NULL)
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continue;
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TAILQ_FOREACH(portal, &port->p_portal_group->pg_portals, p_next) {
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ai = portal->p_ai;
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ret = getnameinfo(ai->ai_addr, ai->ai_addrlen,
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hbuf, sizeof(hbuf), sbuf, sizeof(sbuf),
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NI_NUMERICHOST | NI_NUMERICSERV);
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if (ret != 0) {
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log_warnx("getnameinfo: %s", gai_strerror(ret));
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continue;
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}
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switch (ai->ai_addr->sa_family) {
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case AF_INET:
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if (strcmp(hbuf, "0.0.0.0") == 0)
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continue;
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ret = asprintf(&buf, "%s:%s,%d", hbuf, sbuf,
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port->p_portal_group->pg_tag);
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break;
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case AF_INET6:
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if (strcmp(hbuf, "::") == 0)
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continue;
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ret = asprintf(&buf, "[%s]:%s,%d", hbuf, sbuf,
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port->p_portal_group->pg_tag);
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break;
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default:
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continue;
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}
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if (ret <= 0)
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log_err(1, "asprintf");
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keys_add(response_keys, "TargetAddress", buf);
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free(buf);
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}
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}
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}
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static bool
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discovery_target_filtered_out(const struct connection *conn,
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const struct port *port)
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{
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const struct auth_group *ag;
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const struct portal_group *pg;
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const struct target *targ;
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const struct auth *auth;
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int error;
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targ = port->p_target;
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ag = port->p_auth_group;
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if (ag == NULL)
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ag = targ->t_auth_group;
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pg = conn->conn_portal->p_portal_group;
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assert(pg->pg_discovery_auth_group != PG_FILTER_UNKNOWN);
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if (pg->pg_discovery_filter >= PG_FILTER_PORTAL &&
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auth_portal_check(ag, &conn->conn_initiator_sa) != 0) {
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log_debugx("initiator does not match initiator portals "
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"allowed for target \"%s\"; skipping", targ->t_name);
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return (true);
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}
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if (pg->pg_discovery_filter >= PG_FILTER_PORTAL_NAME &&
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auth_name_check(ag, conn->conn_initiator_name) != 0) {
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log_debugx("initiator does not match initiator names "
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"allowed for target \"%s\"; skipping", targ->t_name);
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return (true);
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}
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if (pg->pg_discovery_filter >= PG_FILTER_PORTAL_NAME_AUTH &&
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ag->ag_type != AG_TYPE_NO_AUTHENTICATION) {
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if (conn->conn_chap == NULL) {
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assert(pg->pg_discovery_auth_group->ag_type ==
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AG_TYPE_NO_AUTHENTICATION);
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log_debugx("initiator didn't authenticate, but target "
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"\"%s\" requires CHAP; skipping", targ->t_name);
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return (true);
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}
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assert(conn->conn_user != NULL);
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auth = auth_find(ag, conn->conn_user);
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if (auth == NULL) {
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log_debugx("CHAP user \"%s\" doesn't match target "
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"\"%s\"; skipping", conn->conn_user, targ->t_name);
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return (true);
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}
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error = chap_authenticate(conn->conn_chap, auth->a_secret);
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if (error != 0) {
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log_debugx("password for CHAP user \"%s\" doesn't "
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"match target \"%s\"; skipping",
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conn->conn_user, targ->t_name);
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return (true);
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}
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}
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return (false);
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}
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void
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discovery(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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const struct port *port;
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const struct portal_group *pg;
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const char *send_targets;
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pg = conn->conn_portal->p_portal_group;
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log_debugx("beginning discovery session; waiting for Text PDU");
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request = text_receive(conn);
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request_keys = keys_new();
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keys_load(request_keys, request);
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send_targets = keys_find(request_keys, "SendTargets");
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if (send_targets == NULL)
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log_errx(1, "received Text PDU without SendTargets");
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response = text_new_response(request);
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response_keys = keys_new();
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if (strcmp(send_targets, "All") == 0) {
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TAILQ_FOREACH(port, &pg->pg_ports, p_pgs) {
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if (discovery_target_filtered_out(conn, port)) {
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/* Ignore this target. */
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continue;
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}
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discovery_add_target(response_keys, port->p_target);
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}
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} else {
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port = port_find_in_pg(pg, send_targets);
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if (port == NULL) {
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log_debugx("initiator requested information on unknown "
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"target \"%s\"; returning nothing", send_targets);
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} else {
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if (discovery_target_filtered_out(conn, port)) {
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/* Ignore this target. */
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} else {
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discovery_add_target(response_keys, port->p_target);
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}
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}
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}
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keys_save(response_keys, response);
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pdu_send(response);
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pdu_delete(response);
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keys_delete(response_keys);
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pdu_delete(request);
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keys_delete(request_keys);
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log_debugx("done sending targets; waiting for Logout PDU");
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request = logout_receive(conn);
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response = logout_new_response(request);
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pdu_send(response);
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pdu_delete(response);
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pdu_delete(request);
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log_debugx("discovery session done");
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}
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