aboutsummaryrefslogtreecommitdiff
path: root/usr.sbin/ctld/discovery.c
blob: 1f8c9c868d4c28455143cc8a8e5e848e12896283 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2012 The FreeBSD Foundation
 * All rights reserved.
 *
 * This software was developed by Edward Tomasz Napierala under sponsorship
 * from the FreeBSD Foundation.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/socket.h>

#include "ctld.h"
#include "iscsi_proto.h"

static struct pdu *
text_receive(struct connection *conn)
{
	struct pdu *request;
	struct iscsi_bhs_text_request *bhstr;

	request = pdu_new(conn);
	pdu_receive(request);
	if ((request->pdu_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) !=
	    ISCSI_BHS_OPCODE_TEXT_REQUEST)
		log_errx(1, "protocol error: received invalid opcode 0x%x",
		    request->pdu_bhs->bhs_opcode);
	bhstr = (struct iscsi_bhs_text_request *)request->pdu_bhs;
#if 0
	if ((bhstr->bhstr_flags & ISCSI_BHSTR_FLAGS_FINAL) == 0)
		log_errx(1, "received Text PDU without the \"F\" flag");
#endif
	/*
	 * XXX: Implement the C flag some day.
	 */
	if ((bhstr->bhstr_flags & BHSTR_FLAGS_CONTINUE) != 0)
		log_errx(1, "received Text PDU with unsupported \"C\" flag");
	if (ISCSI_SNLT(ntohl(bhstr->bhstr_cmdsn), conn->conn_cmdsn)) {
		log_errx(1, "received Text PDU with decreasing CmdSN: "
		    "was %u, is %u", conn->conn_cmdsn, ntohl(bhstr->bhstr_cmdsn));
	}
	if (ntohl(bhstr->bhstr_expstatsn) != conn->conn_statsn) {
		log_errx(1, "received Text PDU with wrong ExpStatSN: "
		    "is %u, should be %u", ntohl(bhstr->bhstr_expstatsn),
		    conn->conn_statsn);
	}
	conn->conn_cmdsn = ntohl(bhstr->bhstr_cmdsn);
	if ((bhstr->bhstr_opcode & ISCSI_BHS_OPCODE_IMMEDIATE) == 0)
		conn->conn_cmdsn++;

	return (request);
}

static struct pdu *
text_new_response(struct pdu *request)
{
	struct pdu *response;
	struct connection *conn;
	struct iscsi_bhs_text_request *bhstr;
	struct iscsi_bhs_text_response *bhstr2;

	bhstr = (struct iscsi_bhs_text_request *)request->pdu_bhs;
	conn = request->pdu_connection;

	response = pdu_new_response(request);
	bhstr2 = (struct iscsi_bhs_text_response *)response->pdu_bhs;
	bhstr2->bhstr_opcode = ISCSI_BHS_OPCODE_TEXT_RESPONSE;
	bhstr2->bhstr_flags = BHSTR_FLAGS_FINAL;
	bhstr2->bhstr_lun = bhstr->bhstr_lun;
	bhstr2->bhstr_initiator_task_tag = bhstr->bhstr_initiator_task_tag;
	bhstr2->bhstr_target_transfer_tag = bhstr->bhstr_target_transfer_tag;
	bhstr2->bhstr_statsn = htonl(conn->conn_statsn++);
	bhstr2->bhstr_expcmdsn = htonl(conn->conn_cmdsn);
	bhstr2->bhstr_maxcmdsn = htonl(conn->conn_cmdsn);

	return (response);
}

static struct pdu *
logout_receive(struct connection *conn)
{
	struct pdu *request;
	struct iscsi_bhs_logout_request *bhslr;

	request = pdu_new(conn);
	pdu_receive(request);
	if ((request->pdu_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) !=
	    ISCSI_BHS_OPCODE_LOGOUT_REQUEST)
		log_errx(1, "protocol error: received invalid opcode 0x%x",
		    request->pdu_bhs->bhs_opcode);
	bhslr = (struct iscsi_bhs_logout_request *)request->pdu_bhs;
	if ((bhslr->bhslr_reason & 0x7f) != BHSLR_REASON_CLOSE_SESSION)
		log_debugx("received Logout PDU with invalid reason 0x%x; "
		    "continuing anyway", bhslr->bhslr_reason & 0x7f);
	if (ISCSI_SNLT(ntohl(bhslr->bhslr_cmdsn), conn->conn_cmdsn)) {
		log_errx(1, "received Logout PDU with decreasing CmdSN: "
		    "was %u, is %u", conn->conn_cmdsn,
		    ntohl(bhslr->bhslr_cmdsn));
	}
	if (ntohl(bhslr->bhslr_expstatsn) != conn->conn_statsn) {
		log_errx(1, "received Logout PDU with wrong ExpStatSN: "
		    "is %u, should be %u", ntohl(bhslr->bhslr_expstatsn),
		    conn->conn_statsn);
	}
	conn->conn_cmdsn = ntohl(bhslr->bhslr_cmdsn);
	if ((bhslr->bhslr_opcode & ISCSI_BHS_OPCODE_IMMEDIATE) == 0)
		conn->conn_cmdsn++;

	return (request);
}

static struct pdu *
logout_new_response(struct pdu *request)
{
	struct pdu *response;
	struct connection *conn;
	struct iscsi_bhs_logout_request *bhslr;
	struct iscsi_bhs_logout_response *bhslr2;

	bhslr = (struct iscsi_bhs_logout_request *)request->pdu_bhs;
	conn = request->pdu_connection;

	response = pdu_new_response(request);
	bhslr2 = (struct iscsi_bhs_logout_response *)response->pdu_bhs;
	bhslr2->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_RESPONSE;
	bhslr2->bhslr_flags = 0x80;
	bhslr2->bhslr_response = BHSLR_RESPONSE_CLOSED_SUCCESSFULLY;
	bhslr2->bhslr_initiator_task_tag = bhslr->bhslr_initiator_task_tag;
	bhslr2->bhslr_statsn = htonl(conn->conn_statsn++);
	bhslr2->bhslr_expcmdsn = htonl(conn->conn_cmdsn);
	bhslr2->bhslr_maxcmdsn = htonl(conn->conn_cmdsn);

	return (response);
}

static void
discovery_add_target(struct keys *response_keys, const struct target *targ)
{
	struct port *port;
	struct portal *portal;
	char *buf;
	char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
	struct addrinfo *ai;
	int ret;

	keys_add(response_keys, "TargetName", targ->t_name);
	TAILQ_FOREACH(port, &targ->t_ports, p_ts) {
	    if (port->p_portal_group == NULL)
		continue;
	    TAILQ_FOREACH(portal, &port->p_portal_group->pg_portals, p_next) {
		ai = portal->p_ai;
		ret = getnameinfo(ai->ai_addr, ai->ai_addrlen,
		    hbuf, sizeof(hbuf), sbuf, sizeof(sbuf),
		    NI_NUMERICHOST | NI_NUMERICSERV);
		if (ret != 0) {
			log_warnx("getnameinfo: %s", gai_strerror(ret));
			continue;
		}
		switch (ai->ai_addr->sa_family) {
		case AF_INET:
			if (strcmp(hbuf, "0.0.0.0") == 0)
				continue;
			ret = asprintf(&buf, "%s:%s,%d", hbuf, sbuf,
			    port->p_portal_group->pg_tag);
			break;
		case AF_INET6:
			if (strcmp(hbuf, "::") == 0)
				continue;
			ret = asprintf(&buf, "[%s]:%s,%d", hbuf, sbuf,
			    port->p_portal_group->pg_tag);
			break;
		default:
			continue;
		}
		if (ret <= 0)
		    log_err(1, "asprintf");
		keys_add(response_keys, "TargetAddress", buf);
		free(buf);
	    }
	}
}

static bool
discovery_target_filtered_out(const struct connection *conn,
    const struct port *port)
{
	const struct auth_group *ag;
	const struct portal_group *pg;
	const struct target *targ;
	const struct auth *auth;
	int error;

	targ = port->p_target;
	ag = port->p_auth_group;
	if (ag == NULL)
		ag = targ->t_auth_group;
	pg = conn->conn_portal->p_portal_group;

	assert(pg->pg_discovery_auth_group != PG_FILTER_UNKNOWN);

	if (pg->pg_discovery_filter >= PG_FILTER_PORTAL &&
	    auth_portal_check(ag, &conn->conn_initiator_sa) != 0) {
		log_debugx("initiator does not match initiator portals "
		    "allowed for target \"%s\"; skipping", targ->t_name);
		return (true);
	}

	if (pg->pg_discovery_filter >= PG_FILTER_PORTAL_NAME &&
	    auth_name_check(ag, conn->conn_initiator_name) != 0) {
		log_debugx("initiator does not match initiator names "
		    "allowed for target \"%s\"; skipping", targ->t_name);
		return (true);
	}

	if (pg->pg_discovery_filter >= PG_FILTER_PORTAL_NAME_AUTH &&
	    ag->ag_type != AG_TYPE_NO_AUTHENTICATION) {
		if (conn->conn_chap == NULL) {
			assert(pg->pg_discovery_auth_group->ag_type ==
			    AG_TYPE_NO_AUTHENTICATION);

			log_debugx("initiator didn't authenticate, but target "
			    "\"%s\" requires CHAP; skipping", targ->t_name);
			return (true);
		}

		assert(conn->conn_user != NULL);
		auth = auth_find(ag, conn->conn_user);
		if (auth == NULL) {
			log_debugx("CHAP user \"%s\" doesn't match target "
			    "\"%s\"; skipping", conn->conn_user, targ->t_name);
			return (true);
		}

		error = chap_authenticate(conn->conn_chap, auth->a_secret);
		if (error != 0) {
			log_debugx("password for CHAP user \"%s\" doesn't "
			    "match target \"%s\"; skipping",
			    conn->conn_user, targ->t_name);
			return (true);
		}
	}

	return (false);
}

void
discovery(struct connection *conn)
{
	struct pdu *request, *response;
	struct keys *request_keys, *response_keys;
	const struct port *port;
	const struct portal_group *pg;
	const char *send_targets;

	pg = conn->conn_portal->p_portal_group;

	log_debugx("beginning discovery session; waiting for Text PDU");
	request = text_receive(conn);
	request_keys = keys_new();
	keys_load(request_keys, request);

	send_targets = keys_find(request_keys, "SendTargets");
	if (send_targets == NULL)
		log_errx(1, "received Text PDU without SendTargets");

	response = text_new_response(request);
	response_keys = keys_new();

	if (strcmp(send_targets, "All") == 0) {
		TAILQ_FOREACH(port, &pg->pg_ports, p_pgs) {
			if (discovery_target_filtered_out(conn, port)) {
				/* Ignore this target. */
				continue;
			}
			discovery_add_target(response_keys, port->p_target);
		}
	} else {
		port = port_find_in_pg(pg, send_targets);
		if (port == NULL) {
			log_debugx("initiator requested information on unknown "
			    "target \"%s\"; returning nothing", send_targets);
		} else {
			if (discovery_target_filtered_out(conn, port)) {
				/* Ignore this target. */
			} else {
				discovery_add_target(response_keys, port->p_target);
			}
		}
	}
	keys_save(response_keys, response);

	pdu_send(response);
	pdu_delete(response);
	keys_delete(response_keys);
	pdu_delete(request);
	keys_delete(request_keys);

	log_debugx("done sending targets; waiting for Logout PDU");
	request = logout_receive(conn);
	response = logout_new_response(request);

	pdu_send(response);
	pdu_delete(response);
	pdu_delete(request);

	log_debugx("discovery session done");
}