1 /*- 2 * Copyright (c) 2005-2008 Daniel Braniss <danny@cs.huji.ac.il> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 /* 28 | $Id: login.c,v 1.4 2007/04/27 07:40:40 danny Exp danny $ 29 */ 30 31 #include <sys/param.h> 32 #include <sys/types.h> 33 #include <sys/socket.h> 34 #include <sys/sysctl.h> 35 36 #include <netinet/in.h> 37 #include <netinet/tcp.h> 38 #include <arpa/inet.h> 39 #if __FreeBSD_version < 500000 40 #include <sys/time.h> 41 #endif 42 #include <sys/ioctl.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 47 #include "iscsi.h" 48 #include "iscontrol.h" 49 50 static char *status_class1[] = { 51 "Initiator error", 52 "Authentication failure", 53 "Authorization failure", 54 "Not found", 55 "Target removed", 56 "Unsupported version", 57 "Too many connections", 58 "Missing parameter", 59 "Can't include in session", 60 "Session type not suported", 61 "Session does not exist", 62 "Invalid during login", 63 }; 64 #define CLASS1_ERRS ((sizeof status_class1) / sizeof(char *)) 65 66 static char *status_class3[] = { 67 "Target error", 68 "Service unavailable", 69 "Out of resources" 70 }; 71 #define CLASS3_ERRS ((sizeof status_class3) / sizeof(char *)) 72 73 static char * 74 selectFrom(char *str, token_t *list) 75 { 76 char *sep, *sp; 77 token_t *lp; 78 int n; 79 80 sp = str; 81 do { 82 sep = strchr(sp, ','); 83 if(sep != NULL) 84 n = sep - sp; 85 else 86 n = strlen(sp); 87 88 for(lp = list; lp->name != NULL; lp++) { 89 if(strncasecmp(lp->name, sp, n) == 0) 90 return strdup(lp->name); 91 } 92 sp = sep + 1; 93 } while(sep != NULL); 94 95 return NULL; 96 } 97 98 static char * 99 getkeyval(char *key, pdu_t *pp) 100 { 101 char *ptr; 102 int klen, len, n; 103 104 debug_called(3); 105 106 len = pp->ds_len; 107 ptr = (char *)pp->ds; 108 klen = strlen(key); 109 while(len > klen) { 110 if(strncmp(key, ptr, klen) == 0) 111 return ptr+klen; 112 n = strlen(ptr) + 1; 113 len -= n; 114 ptr += n; 115 } 116 return 0; 117 } 118 119 static int 120 handleTgtResp(isess_t *sess, pdu_t *pp) 121 { 122 isc_opt_t *op = sess->op; 123 char *np, *rp, *d1, *d2; 124 int res, l1, l2; 125 126 res = -1; 127 if(((np = getkeyval("CHAP_N=", pp)) == NULL) || 128 ((rp = getkeyval("CHAP_R=", pp)) == NULL)) 129 goto out; 130 if(strcmp(np, op->tgtChapName? op->tgtChapName: op->initiatorName) != 0) { 131 fprintf(stderr, "%s does not match\n", np); 132 goto out; 133 } 134 l1 = str2bin(op->tgtChapDigest, &d1); 135 l2 = str2bin(rp, &d2); 136 137 debug(3, "l1=%d '%s' l2=%d '%s'", l1, op->tgtChapDigest, l2, rp); 138 if(l1 == l2 && memcmp(d1, d2, l1) == 0) 139 res = 0; 140 if(l1) 141 free(d1); 142 if(l2) 143 free(d2); 144 out: 145 free(op->tgtChapDigest); 146 op->tgtChapDigest = NULL; 147 148 debug(3, "res=%d", res); 149 150 return res; 151 } 152 153 static void 154 processParams(isess_t *sess, pdu_t *pp) 155 { 156 isc_opt_t *op = sess->op; 157 int len, klen, n; 158 char *eq, *ptr; 159 160 debug_called(3); 161 162 len = pp->ds_len; 163 ptr = (char *)pp->ds; 164 while(len > 0) { 165 if(vflag > 1) 166 printf("got: len=%d %s\n", len, ptr); 167 klen = 0; 168 if((eq = strchr(ptr, '=')) != NULL) 169 klen = eq - ptr; 170 if(klen > 0) { 171 if(strncmp(ptr, "TargetAddress", klen) == 0) { 172 char *p, *q, *ta = NULL; 173 174 // TargetAddress=domainname[:port][,portal-group-tag] 175 // XXX: if(op->targetAddress) free(op->targetAddress); 176 q = op->targetAddress = strdup(eq+1); 177 if(*q == '[') { 178 // bracketed IPv6 179 if((q = strchr(q, ']')) != NULL) { 180 *q++ = '\0'; 181 ta = op->targetAddress; 182 op->targetAddress = strdup(ta+1); 183 } else 184 q = op->targetAddress; 185 } 186 if((p = strchr(q, ',')) != NULL) { 187 *p++ = 0; 188 op->targetPortalGroupTag = atoi(p); 189 } 190 if((p = strchr(q, ':')) != NULL) { 191 *p++ = 0; 192 op->port = atoi(p); 193 } 194 if(ta) 195 free(ta); 196 } else if(strncmp(ptr, "MaxRecvDataSegmentLength", klen) == 0) { 197 // danny's RFC 198 op->maxXmitDataSegmentLength = strtol(eq+1, NULL, 0); 199 } else if(strncmp(ptr, "TargetPortalGroupTag", klen) == 0) { 200 op->targetPortalGroupTag = strtol(eq+1, NULL, 0); 201 } else if(strncmp(ptr, "HeaderDigest", klen) == 0) { 202 op->headerDigest = selectFrom(eq+1, DigestMethods); 203 } else if(strncmp(ptr, "DataDigest", klen) == 0) { 204 op->dataDigest = selectFrom(eq+1, DigestMethods); 205 } else if(strncmp(ptr, "MaxOutstandingR2T", klen) == 0) 206 op->maxOutstandingR2T = strtol(eq+1, NULL, 0); 207 #if 0 208 else 209 for(kp = keyMap; kp->name; kp++) { 210 if(strncmp(ptr, kp->name, kp->len) == 0 && ptr[kp->len] == '=') 211 mp->func(sess, ptr+kp->len+1, GET); 212 } 213 #endif 214 } 215 n = strlen(ptr) + 1; 216 len -= n; 217 ptr += n; 218 } 219 220 } 221 222 static int 223 handleLoginResp(isess_t *sess, pdu_t *pp) 224 { 225 login_rsp_t *lp = (login_rsp_t *)pp; 226 uint st_class, status = ntohs(lp->status); 227 228 debug_called(3); 229 debug(4, "Tbit=%d csg=%d nsg=%d status=%x", lp->T, lp->CSG, lp->NSG, status); 230 231 st_class = status >> 8; 232 if(status) { 233 unsigned int st_detail = status & 0xff; 234 235 switch(st_class) { 236 case 1: // Redirect 237 switch(st_detail) { 238 // the ITN (iSCSI target Name) requests a: 239 case 1: // temporary address change 240 case 2: // permanent address change 241 status = 0; 242 } 243 break; 244 245 case 2: // Initiator Error 246 if(st_detail < CLASS1_ERRS) 247 printf("0x%04x: %s\n", status, status_class1[st_detail]); 248 break; 249 250 case 3: 251 if(st_detail < CLASS3_ERRS) 252 printf("0x%04x: %s\n", status, status_class3[st_detail]); 253 break; 254 } 255 } 256 257 if(status == 0) { 258 processParams(sess, pp); 259 setOptions(sess, 0); // XXX: just in case ... 260 261 if(lp->T) { 262 isc_opt_t *op = sess->op; 263 264 if(sess->csg == SN_PHASE && (op->tgtChapDigest != NULL)) 265 if(handleTgtResp(sess, pp) != 0) 266 return 1; // XXX: Authentication failure ... 267 sess->csg = lp->NSG; 268 if(sess->csg == FF_PHASE) { 269 // XXX: will need this when implementing reconnect. 270 sess->tsih = lp->tsih; 271 debug(2, "TSIH=%x", sess->tsih); 272 } 273 } 274 } 275 276 return st_class; 277 } 278 279 static int 280 handleChap(isess_t *sess, pdu_t *pp) 281 { 282 pdu_t spp; 283 login_req_t *lp; 284 isc_opt_t *op = sess->op; 285 char *ap, *ip, *cp, *digest; // MD5 is 128bits, SHA1 160bits 286 287 debug_called(3); 288 289 bzero(&spp, sizeof(pdu_t)); 290 lp = (login_req_t *)&spp.ipdu.bhs; 291 lp->cmd = ISCSI_LOGIN_CMD | 0x40; // login request + Inmediate 292 memcpy(lp->isid, sess->isid, 6); 293 lp->tsih = sess->tsih; // MUST be zero the first time! 294 lp->CID = htons(1); 295 lp->CSG = SN_PHASE; // Security Negotiation 296 lp->NSG = LON_PHASE; 297 lp->T = 1; 298 299 if(((ap = getkeyval("CHAP_A=", pp)) == NULL) || 300 ((ip = getkeyval("CHAP_I=", pp)) == NULL) || 301 ((cp = getkeyval("CHAP_C=", pp)) == NULL)) 302 return -1; 303 304 if((digest = chapDigest(ap, (char)strtol(ip, NULL, 0), cp, op->chapSecret)) == NULL) 305 return -1; 306 307 addText(&spp, "CHAP_N=%s", op->chapIName? op->chapIName: op->initiatorName); 308 addText(&spp, "CHAP_R=%s", digest); 309 free(digest); 310 311 if(op->tgtChapSecret != NULL) { 312 op->tgtChapID = (random() >> 24) % 255; // should be random enough ... 313 addText(&spp, "CHAP_I=%d", op->tgtChapID); 314 cp = genChapChallenge(cp, op->tgtChallengeLen? op->tgtChallengeLen: 8); 315 addText(&spp, "CHAP_C=%s", cp); 316 op->tgtChapDigest = chapDigest(ap, op->tgtChapID, cp, op->tgtChapSecret); 317 } 318 319 return sendPDU(sess, &spp, handleLoginResp); 320 } 321 322 static int 323 authenticate(isess_t *sess) 324 { 325 pdu_t spp; 326 login_req_t *lp; 327 isc_opt_t *op = sess->op; 328 329 bzero(&spp, sizeof(pdu_t)); 330 lp = (login_req_t *)&spp.ipdu.bhs; 331 lp->cmd = ISCSI_LOGIN_CMD | 0x40; // login request + Inmediate 332 memcpy(lp->isid, sess->isid, 6); 333 lp->tsih = sess->tsih; // MUST be zero the first time! 334 lp->CID = htons(1); 335 lp->CSG = SN_PHASE; // Security Negotiation 336 lp->NSG = SN_PHASE; 337 lp->T = 0; 338 339 switch((authm_t)lookup(AuthMethods, op->authMethod)) { 340 case NONE: 341 return 0; 342 343 case KRB5: 344 case SPKM1: 345 case SPKM2: 346 case SRP: 347 return 2; 348 349 case CHAP: 350 if(op->chapDigest == 0) 351 addText(&spp, "CHAP_A=5"); 352 else 353 if(strcmp(op->chapDigest, "MD5") == 0) 354 addText(&spp, "CHAP_A=5"); 355 else 356 if(strcmp(op->chapDigest, "SHA1") == 0) 357 addText(&spp, "CHAP_A=7"); 358 else 359 addText(&spp, "CHAP_A=5,7"); 360 return sendPDU(sess, &spp, handleChap); 361 } 362 return 1; 363 } 364 365 int 366 loginPhase(isess_t *sess) 367 { 368 pdu_t spp, *sp = &spp; 369 isc_opt_t *op = sess->op; 370 login_req_t *lp; 371 int status = 1; 372 373 debug_called(3); 374 375 bzero(sp, sizeof(pdu_t)); 376 lp = (login_req_t *)&spp.ipdu.bhs; 377 lp->cmd = ISCSI_LOGIN_CMD | 0x40; // login request + Inmediate 378 memcpy(lp->isid, sess->isid, 6); 379 lp->tsih = sess->tsih; // MUST be zero the first time! 380 lp->CID = htons(1); // sess->cid? 381 382 if((lp->CSG = sess->csg) == LON_PHASE) 383 lp->NSG = FF_PHASE; // lets try and go full feature ... 384 else 385 lp->NSG = LON_PHASE; 386 lp->T = 1; // transit to next login stage 387 388 if(sess->flags & SESS_INITIALLOGIN1) { 389 sess->flags &= ~SESS_INITIALLOGIN1; 390 391 addText(sp, "SessionType=%s", op->sessionType); 392 addText(sp, "InitiatorName=%s", op->initiatorName); 393 if(strcmp(op->sessionType, "Discovery") != 0) { 394 addText(sp, "TargetName=%s", op->targetName); 395 } 396 } 397 switch(sess->csg) { 398 case SN_PHASE: // Security Negotiation 399 addText(sp, "AuthMethod=%s", op->authMethod); 400 break; 401 402 case LON_PHASE: // Login Operational Negotiation 403 if((sess->flags & SESS_NEGODONE) == 0) { 404 sess->flags |= SESS_NEGODONE; 405 addText(sp, "MaxBurstLength=%d", op->maxBurstLength); 406 addText(sp, "HeaderDigest=%s", op->headerDigest); 407 addText(sp, "DataDigest=%s", op->dataDigest); 408 addText(sp, "MaxRecvDataSegmentLength=%d", op->maxRecvDataSegmentLength); 409 addText(sp, "ErrorRecoveryLevel=%d", op->errorRecoveryLevel); 410 addText(sp, "DefaultTime2Wait=%d", op->defaultTime2Wait); 411 addText(sp, "DefaultTime2Retain=%d", op->defaultTime2Retain); 412 addText(sp, "DataPDUInOrder=%s", op->dataPDUInOrder? "Yes": "No"); 413 addText(sp, "DataSequenceInOrder=%s", op->dataSequenceInOrder? "Yes": "No"); 414 addText(sp, "MaxOutstandingR2T=%d", op->maxOutstandingR2T); 415 416 if(strcmp(op->sessionType, "Discovery") != 0) { 417 addText(sp, "MaxConnections=%d", op->maxConnections); 418 addText(sp, "FirstBurstLength=%d", op->firstBurstLength); 419 addText(sp, "InitialR2T=%s", op->initialR2T? "Yes": "No"); 420 addText(sp, "ImmediateData=%s", op->immediateData? "Yes": "No"); 421 } 422 } 423 424 break; 425 } 426 427 status = sendPDU(sess, &spp, handleLoginResp); 428 429 switch(status) { 430 case 0: // all is ok ... 431 if(sess->csg == SN_PHASE) 432 /* 433 | if we are still here, then we need 434 | to exchange some secrets ... 435 */ 436 status = authenticate(sess); 437 } 438 439 return status; 440 } 441