1 /*- 2 * Copyright (c) 2012 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Edward Tomasz Napierala under sponsorship 6 * from the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <assert.h> 35 #include <stdint.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 #include <netinet/in.h> 40 #include <netdb.h> 41 #include <sys/socket.h> 42 43 #include "ctld.h" 44 #include "iscsi_proto.h" 45 46 static struct pdu * 47 text_receive(struct connection *conn) 48 { 49 struct pdu *request; 50 struct iscsi_bhs_text_request *bhstr; 51 52 request = pdu_new(conn); 53 pdu_receive(request); 54 if ((request->pdu_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) != 55 ISCSI_BHS_OPCODE_TEXT_REQUEST) 56 log_errx(1, "protocol error: received invalid opcode 0x%x", 57 request->pdu_bhs->bhs_opcode); 58 bhstr = (struct iscsi_bhs_text_request *)request->pdu_bhs; 59 #if 0 60 if ((bhstr->bhstr_flags & ISCSI_BHSTR_FLAGS_FINAL) == 0) 61 log_errx(1, "received Text PDU without the \"F\" flag"); 62 #endif 63 /* 64 * XXX: Implement the C flag some day. 65 */ 66 if ((bhstr->bhstr_flags & BHSTR_FLAGS_CONTINUE) != 0) 67 log_errx(1, "received Text PDU with unsupported \"C\" flag"); 68 if (ISCSI_SNLT(ntohl(bhstr->bhstr_cmdsn), conn->conn_cmdsn)) { 69 log_errx(1, "received Text PDU with decreasing CmdSN: " 70 "was %u, is %u", conn->conn_cmdsn, ntohl(bhstr->bhstr_cmdsn)); 71 } 72 if (ntohl(bhstr->bhstr_expstatsn) != conn->conn_statsn) { 73 log_errx(1, "received Text PDU with wrong StatSN: " 74 "is %u, should be %u", ntohl(bhstr->bhstr_expstatsn), 75 conn->conn_statsn); 76 } 77 conn->conn_cmdsn = ntohl(bhstr->bhstr_cmdsn); 78 79 return (request); 80 } 81 82 static struct pdu * 83 text_new_response(struct pdu *request) 84 { 85 struct pdu *response; 86 struct connection *conn; 87 struct iscsi_bhs_text_request *bhstr; 88 struct iscsi_bhs_text_response *bhstr2; 89 90 bhstr = (struct iscsi_bhs_text_request *)request->pdu_bhs; 91 conn = request->pdu_connection; 92 93 response = pdu_new_response(request); 94 bhstr2 = (struct iscsi_bhs_text_response *)response->pdu_bhs; 95 bhstr2->bhstr_opcode = ISCSI_BHS_OPCODE_TEXT_RESPONSE; 96 bhstr2->bhstr_flags = BHSTR_FLAGS_FINAL; 97 bhstr2->bhstr_lun = bhstr->bhstr_lun; 98 bhstr2->bhstr_initiator_task_tag = bhstr->bhstr_initiator_task_tag; 99 bhstr2->bhstr_target_transfer_tag = bhstr->bhstr_target_transfer_tag; 100 bhstr2->bhstr_statsn = htonl(conn->conn_statsn++); 101 bhstr2->bhstr_expcmdsn = htonl(conn->conn_cmdsn); 102 bhstr2->bhstr_maxcmdsn = htonl(conn->conn_cmdsn); 103 104 return (response); 105 } 106 107 static struct pdu * 108 logout_receive(struct connection *conn) 109 { 110 struct pdu *request; 111 struct iscsi_bhs_logout_request *bhslr; 112 113 request = pdu_new(conn); 114 pdu_receive(request); 115 if ((request->pdu_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) != 116 ISCSI_BHS_OPCODE_LOGOUT_REQUEST) 117 log_errx(1, "protocol error: received invalid opcode 0x%x", 118 request->pdu_bhs->bhs_opcode); 119 bhslr = (struct iscsi_bhs_logout_request *)request->pdu_bhs; 120 if ((bhslr->bhslr_reason & 0x7f) != BHSLR_REASON_CLOSE_SESSION) 121 log_debugx("received Logout PDU with invalid reason 0x%x; " 122 "continuing anyway", bhslr->bhslr_reason & 0x7f); 123 if (ISCSI_SNLT(ntohl(bhslr->bhslr_cmdsn), conn->conn_cmdsn)) { 124 log_errx(1, "received Logout PDU with decreasing CmdSN: " 125 "was %u, is %u", conn->conn_cmdsn, 126 ntohl(bhslr->bhslr_cmdsn)); 127 } 128 if (ntohl(bhslr->bhslr_expstatsn) != conn->conn_statsn) { 129 log_errx(1, "received Logout PDU with wrong StatSN: " 130 "is %u, should be %u", ntohl(bhslr->bhslr_expstatsn), 131 conn->conn_statsn); 132 } 133 conn->conn_cmdsn = ntohl(bhslr->bhslr_cmdsn); 134 135 return (request); 136 } 137 138 static struct pdu * 139 logout_new_response(struct pdu *request) 140 { 141 struct pdu *response; 142 struct connection *conn; 143 struct iscsi_bhs_logout_request *bhslr; 144 struct iscsi_bhs_logout_response *bhslr2; 145 146 bhslr = (struct iscsi_bhs_logout_request *)request->pdu_bhs; 147 conn = request->pdu_connection; 148 149 response = pdu_new_response(request); 150 bhslr2 = (struct iscsi_bhs_logout_response *)response->pdu_bhs; 151 bhslr2->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_RESPONSE; 152 bhslr2->bhslr_flags = 0x80; 153 bhslr2->bhslr_response = BHSLR_RESPONSE_CLOSED_SUCCESSFULLY; 154 bhslr2->bhslr_initiator_task_tag = bhslr->bhslr_initiator_task_tag; 155 bhslr2->bhslr_statsn = htonl(conn->conn_statsn++); 156 bhslr2->bhslr_expcmdsn = htonl(conn->conn_cmdsn); 157 bhslr2->bhslr_maxcmdsn = htonl(conn->conn_cmdsn); 158 159 return (response); 160 } 161 162 static void 163 discovery_add_target(struct keys *response_keys, const struct target *targ) 164 { 165 struct port *port; 166 struct portal *portal; 167 char *buf; 168 char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV]; 169 struct addrinfo *ai; 170 int ret; 171 172 keys_add(response_keys, "TargetName", targ->t_name); 173 TAILQ_FOREACH(port, &targ->t_ports, p_ts) { 174 if (port->p_portal_group == NULL) 175 continue; 176 TAILQ_FOREACH(portal, &port->p_portal_group->pg_portals, p_next) { 177 ai = portal->p_ai; 178 ret = getnameinfo(ai->ai_addr, ai->ai_addrlen, 179 hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), 180 NI_NUMERICHOST | NI_NUMERICSERV); 181 if (ret != 0) { 182 log_warnx("getnameinfo: %s", gai_strerror(ret)); 183 continue; 184 } 185 switch (ai->ai_addr->sa_family) { 186 case AF_INET: 187 if (strcmp(hbuf, "0.0.0.0") == 0) 188 continue; 189 ret = asprintf(&buf, "%s:%s,%d", hbuf, sbuf, 190 port->p_portal_group->pg_tag); 191 break; 192 case AF_INET6: 193 if (strcmp(hbuf, "::") == 0) 194 continue; 195 ret = asprintf(&buf, "[%s]:%s,%d", hbuf, sbuf, 196 port->p_portal_group->pg_tag); 197 break; 198 default: 199 continue; 200 } 201 if (ret <= 0) 202 log_err(1, "asprintf"); 203 keys_add(response_keys, "TargetAddress", buf); 204 free(buf); 205 } 206 } 207 } 208 209 static bool 210 discovery_target_filtered_out(const struct connection *conn, 211 const struct port *port) 212 { 213 const struct auth_group *ag; 214 const struct portal_group *pg; 215 const struct target *targ; 216 const struct auth *auth; 217 int error; 218 219 targ = port->p_target; 220 ag = port->p_auth_group; 221 if (ag == NULL) 222 ag = targ->t_auth_group; 223 pg = conn->conn_portal->p_portal_group; 224 225 assert(pg->pg_discovery_auth_group != PG_FILTER_UNKNOWN); 226 227 if (pg->pg_discovery_filter >= PG_FILTER_PORTAL && 228 auth_portal_check(ag, &conn->conn_initiator_sa) != 0) { 229 log_debugx("initiator does not match initiator portals " 230 "allowed for target \"%s\"; skipping", targ->t_name); 231 return (true); 232 } 233 234 if (pg->pg_discovery_filter >= PG_FILTER_PORTAL_NAME && 235 auth_name_check(ag, conn->conn_initiator_name) != 0) { 236 log_debugx("initiator does not match initiator names " 237 "allowed for target \"%s\"; skipping", targ->t_name); 238 return (true); 239 } 240 241 if (pg->pg_discovery_filter >= PG_FILTER_PORTAL_NAME_AUTH && 242 ag->ag_type != AG_TYPE_NO_AUTHENTICATION) { 243 if (conn->conn_chap == NULL) { 244 assert(pg->pg_discovery_auth_group->ag_type == 245 AG_TYPE_NO_AUTHENTICATION); 246 247 log_debugx("initiator didn't authenticate, but target " 248 "\"%s\" requires CHAP; skipping", targ->t_name); 249 return (true); 250 } 251 252 assert(conn->conn_user != NULL); 253 auth = auth_find(ag, conn->conn_user); 254 if (auth == NULL) { 255 log_debugx("CHAP user \"%s\" doesn't match target " 256 "\"%s\"; skipping", conn->conn_user, targ->t_name); 257 return (true); 258 } 259 260 error = chap_authenticate(conn->conn_chap, auth->a_secret); 261 if (error != 0) { 262 log_debugx("password for CHAP user \"%s\" doesn't " 263 "match target \"%s\"; skipping", 264 conn->conn_user, targ->t_name); 265 return (true); 266 } 267 } 268 269 return (false); 270 } 271 272 void 273 discovery(struct connection *conn) 274 { 275 struct pdu *request, *response; 276 struct keys *request_keys, *response_keys; 277 const struct port *port; 278 const struct portal_group *pg; 279 const char *send_targets; 280 281 pg = conn->conn_portal->p_portal_group; 282 283 log_debugx("beginning discovery session; waiting for Text PDU"); 284 request = text_receive(conn); 285 request_keys = keys_new(); 286 keys_load(request_keys, request); 287 288 send_targets = keys_find(request_keys, "SendTargets"); 289 if (send_targets == NULL) 290 log_errx(1, "received Text PDU without SendTargets"); 291 292 response = text_new_response(request); 293 response_keys = keys_new(); 294 295 if (strcmp(send_targets, "All") == 0) { 296 TAILQ_FOREACH(port, &pg->pg_ports, p_pgs) { 297 if (discovery_target_filtered_out(conn, port)) { 298 /* Ignore this target. */ 299 continue; 300 } 301 discovery_add_target(response_keys, port->p_target); 302 } 303 } else { 304 port = port_find_in_pg(pg, send_targets); 305 if (port == NULL) { 306 log_debugx("initiator requested information on unknown " 307 "target \"%s\"; returning nothing", send_targets); 308 } else { 309 if (discovery_target_filtered_out(conn, port)) { 310 /* Ignore this target. */ 311 } else { 312 discovery_add_target(response_keys, port->p_target); 313 } 314 } 315 } 316 keys_save(response_keys, response); 317 318 pdu_send(response); 319 pdu_delete(response); 320 keys_delete(response_keys); 321 pdu_delete(request); 322 keys_delete(request_keys); 323 324 log_debugx("done sending targets; waiting for Logout PDU"); 325 request = logout_receive(conn); 326 response = logout_new_response(request); 327 328 pdu_send(response); 329 pdu_delete(response); 330 pdu_delete(request); 331 332 log_debugx("discovery session done"); 333 } 334