jail.c revision 337876
1/*- 2 * Copyright (c) 2009 James Gritton. 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#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: stable/10/lib/libjail/jail.c 337876 2018-08-15 21:38:44Z jamie $"); 29 30#include <sys/param.h> 31#include <sys/types.h> 32#include <sys/jail.h> 33#include <sys/linker.h> 34#include <sys/socket.h> 35#include <sys/sysctl.h> 36 37#include <arpa/inet.h> 38#include <netinet/in.h> 39 40#include <errno.h> 41#include <inttypes.h> 42#include <stdio.h> 43#include <stdarg.h> 44#include <stdlib.h> 45#include <string.h> 46 47#include "jail.h" 48 49#define SJPARAM "security.jail.param" 50 51#define JPS_IN_ADDR 1 52#define JPS_IN6_ADDR 2 53 54#define ARRAY_SANITY 5 55#define ARRAY_SLOP 5 56 57 58static int jailparam_import_enum(const char **values, int nvalues, 59 const char *valstr, size_t valsize, int *value); 60static int jailparam_type(struct jailparam *jp); 61static int kldload_param(const char *name); 62static char *noname(const char *name); 63static char *nononame(const char *name); 64 65char jail_errmsg[JAIL_ERRMSGLEN]; 66 67static const char *bool_values[] = { "false", "true" }; 68static const char *jailsys_values[] = { "disable", "new", "inherit" }; 69 70 71/* 72 * Import a null-terminated parameter list and set a jail with the flags 73 * and parameters. 74 */ 75int 76jail_setv(int flags, ...) 77{ 78 va_list ap, tap; 79 struct jailparam *jp; 80 const char *name, *value; 81 int njp, jid; 82 83 /* Create the parameter list and import the parameters. */ 84 va_start(ap, flags); 85 va_copy(tap, ap); 86 for (njp = 0; va_arg(tap, char *) != NULL; njp++) 87 (void)va_arg(tap, char *); 88 va_end(tap); 89 jp = alloca(njp * sizeof(struct jailparam)); 90 for (njp = 0; (name = va_arg(ap, char *)) != NULL;) { 91 value = va_arg(ap, char *); 92 if (jailparam_init(jp + njp, name) < 0) 93 goto error; 94 if (jailparam_import(jp + njp++, value) < 0) 95 goto error; 96 } 97 va_end(ap); 98 jid = jailparam_set(jp, njp, flags); 99 jailparam_free(jp, njp); 100 return (jid); 101 102 error: 103 jailparam_free(jp, njp); 104 va_end(ap); 105 return (-1); 106} 107 108/* 109 * Read a null-terminated parameter list, get the referenced jail, and export 110 * the parameters to the list. 111 */ 112int 113jail_getv(int flags, ...) 114{ 115 va_list ap, tap; 116 struct jailparam *jp, *jp_lastjid, *jp_jid, *jp_name, *jp_key; 117 char *valarg, *value; 118 const char *name, *key_value, *lastjid_value, *jid_value, *name_value; 119 int njp, i, jid; 120 121 /* Create the parameter list and find the key. */ 122 va_start(ap, flags); 123 va_copy(tap, ap); 124 for (njp = 0; va_arg(tap, char *) != NULL; njp++) 125 (void)va_arg(tap, char *); 126 va_end(tap); 127 128 jp = alloca(njp * sizeof(struct jailparam)); 129 va_copy(tap, ap); 130 jp_lastjid = jp_jid = jp_name = NULL; 131 lastjid_value = jid_value = name_value = NULL; 132 for (njp = 0; (name = va_arg(tap, char *)) != NULL; njp++) { 133 value = va_arg(tap, char *); 134 if (jailparam_init(jp + njp, name) < 0) { 135 va_end(tap); 136 goto error; 137 } 138 if (!strcmp(jp[njp].jp_name, "lastjid")) { 139 jp_lastjid = jp + njp; 140 lastjid_value = value; 141 } else if (!strcmp(jp[njp].jp_name, "jid")) { 142 jp_jid = jp + njp; 143 jid_value = value; 144 } if (!strcmp(jp[njp].jp_name, "name")) { 145 jp_name = jp + njp; 146 name_value = value; 147 } 148 } 149 va_end(tap); 150 /* Import the key parameter. */ 151 if (jp_lastjid != NULL) { 152 jp_key = jp_lastjid; 153 key_value = lastjid_value; 154 } else if (jp_jid != NULL && strtol(jid_value, NULL, 10) != 0) { 155 jp_key = jp_jid; 156 key_value = jid_value; 157 } else if (jp_name != NULL) { 158 jp_key = jp_name; 159 key_value = name_value; 160 } else { 161 strlcpy(jail_errmsg, "no jail specified", JAIL_ERRMSGLEN); 162 errno = ENOENT; 163 goto error; 164 } 165 if (jailparam_import(jp_key, key_value) < 0) 166 goto error; 167 /* Get the jail and export the parameters. */ 168 jid = jailparam_get(jp, njp, flags); 169 if (jid < 0) 170 goto error; 171 for (i = 0; i < njp; i++) { 172 (void)va_arg(ap, char *); 173 valarg = va_arg(ap, char *); 174 if (jp + i != jp_key) { 175 /* It's up to the caller to ensure there's room. */ 176 if ((jp[i].jp_ctltype & CTLTYPE) == CTLTYPE_STRING) 177 strcpy(valarg, jp[i].jp_value); 178 else { 179 value = jailparam_export(jp + i); 180 if (value == NULL) 181 goto error; 182 strcpy(valarg, value); 183 free(value); 184 } 185 } 186 } 187 jailparam_free(jp, njp); 188 va_end(ap); 189 return (jid); 190 191 error: 192 jailparam_free(jp, njp); 193 va_end(ap); 194 return (-1); 195} 196 197/* 198 * Return a list of all known parameters. 199 */ 200int 201jailparam_all(struct jailparam **jpp) 202{ 203 struct jailparam *jp, *tjp; 204 size_t mlen1, mlen2, buflen; 205 int njp, nlist; 206 int mib1[CTL_MAXNAME], mib2[CTL_MAXNAME - 2]; 207 char buf[MAXPATHLEN]; 208 209 njp = 0; 210 nlist = 32; 211 jp = malloc(nlist * sizeof(*jp)); 212 if (jp == NULL) { 213 strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN); 214 return (-1); 215 } 216 mib1[0] = 0; 217 mib1[1] = 2; 218 mlen1 = CTL_MAXNAME - 2; 219 if (sysctlnametomib(SJPARAM, mib1 + 2, &mlen1) < 0) { 220 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 221 "sysctlnametomib(" SJPARAM "): %s", strerror(errno)); 222 goto error; 223 } 224 for (;; njp++) { 225 /* Get the next parameter. */ 226 mlen2 = sizeof(mib2); 227 if (sysctl(mib1, mlen1 + 2, mib2, &mlen2, NULL, 0) < 0) { 228 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 229 "sysctl(0.2): %s", strerror(errno)); 230 goto error; 231 } 232 if (mib2[0] != mib1[2] || mib2[1] != mib1[3] || 233 mib2[2] != mib1[4]) 234 break; 235 /* Convert it to an ascii name. */ 236 memcpy(mib1 + 2, mib2, mlen2); 237 mlen1 = mlen2 / sizeof(int); 238 mib1[1] = 1; 239 buflen = sizeof(buf); 240 if (sysctl(mib1, mlen1 + 2, buf, &buflen, NULL, 0) < 0) { 241 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 242 "sysctl(0.1): %s", strerror(errno)); 243 goto error; 244 } 245 if (buf[buflen - 2] == '.') 246 buf[buflen - 2] = '\0'; 247 /* Add the parameter to the list */ 248 if (njp >= nlist) { 249 nlist *= 2; 250 tjp = realloc(jp, nlist * sizeof(*jp)); 251 if (tjp == NULL) 252 goto error; 253 jp = tjp; 254 } 255 if (jailparam_init(jp + njp, buf + sizeof(SJPARAM)) < 0) 256 goto error; 257 mib1[1] = 2; 258 } 259 jp = realloc(jp, njp * sizeof(*jp)); 260 *jpp = jp; 261 return (njp); 262 263 error: 264 jailparam_free(jp, njp); 265 free(jp); 266 return (-1); 267} 268 269/* 270 * Clear a jail parameter and copy in its name. 271 */ 272int 273jailparam_init(struct jailparam *jp, const char *name) 274{ 275 276 memset(jp, 0, sizeof(*jp)); 277 jp->jp_name = strdup(name); 278 if (jp->jp_name == NULL) { 279 strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN); 280 return (-1); 281 } 282 if (jailparam_type(jp) < 0) { 283 jailparam_free(jp, 1); 284 jp->jp_name = NULL; 285 jp->jp_value = NULL; 286 return (-1); 287 } 288 return (0); 289} 290 291/* 292 * Put a name and value into a jail parameter element, converting the value 293 * to internal form. 294 */ 295int 296jailparam_import(struct jailparam *jp, const char *value) 297{ 298 char *p, *ep, *tvalue; 299 const char *avalue; 300 int i, nval, fw; 301 302 if (value == NULL) 303 return (0); 304 if ((jp->jp_ctltype & CTLTYPE) == CTLTYPE_STRING) { 305 jp->jp_value = strdup(value); 306 if (jp->jp_value == NULL) { 307 strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN); 308 return (-1); 309 } 310 return (0); 311 } 312 nval = 1; 313 if (jp->jp_elemlen) { 314 if (value[0] == '\0' || (value[0] == '-' && value[1] == '\0')) { 315 jp->jp_value = strdup(""); 316 if (jp->jp_value == NULL) { 317 strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN); 318 return (-1); 319 } 320 jp->jp_valuelen = 0; 321 return (0); 322 } 323 for (p = strchr(value, ','); p; p = strchr(p + 1, ',')) 324 nval++; 325 jp->jp_valuelen = jp->jp_elemlen * nval; 326 } 327 jp->jp_value = malloc(jp->jp_valuelen); 328 if (jp->jp_value == NULL) { 329 strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN); 330 return (-1); 331 } 332 avalue = value; 333 for (i = 0; i < nval; i++) { 334 fw = nval == 1 ? strlen(avalue) : strcspn(avalue, ","); 335 switch (jp->jp_ctltype & CTLTYPE) { 336 case CTLTYPE_INT: 337 if (jp->jp_flags & (JP_BOOL | JP_NOBOOL)) { 338 if (!jailparam_import_enum(bool_values, 2, 339 avalue, fw, &((int *)jp->jp_value)[i])) { 340 snprintf(jail_errmsg, 341 JAIL_ERRMSGLEN, "%s: " 342 "unknown boolean value \"%.*s\"", 343 jp->jp_name, fw, avalue); 344 errno = EINVAL; 345 goto error; 346 } 347 break; 348 } 349 if (jp->jp_flags & JP_JAILSYS) { 350 /* 351 * Allow setting a jailsys parameter to "new" 352 * in a booleanesque fashion. 353 */ 354 if (value[0] == '\0') 355 ((int *)jp->jp_value)[i] = JAIL_SYS_NEW; 356 else if (!jailparam_import_enum(jailsys_values, 357 sizeof(jailsys_values) / 358 sizeof(jailsys_values[0]), avalue, fw, 359 &((int *)jp->jp_value)[i])) { 360 snprintf(jail_errmsg, 361 JAIL_ERRMSGLEN, "%s: " 362 "unknown jailsys value \"%.*s\"", 363 jp->jp_name, fw, avalue); 364 errno = EINVAL; 365 goto error; 366 } 367 break; 368 } 369 ((int *)jp->jp_value)[i] = strtol(avalue, &ep, 10); 370 integer_test: 371 if (ep != avalue + fw) { 372 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 373 "%s: non-integer value \"%.*s\"", 374 jp->jp_name, fw, avalue); 375 errno = EINVAL; 376 goto error; 377 } 378 break; 379 case CTLTYPE_UINT: 380 ((unsigned *)jp->jp_value)[i] = 381 strtoul(avalue, &ep, 10); 382 goto integer_test; 383 case CTLTYPE_LONG: 384 ((long *)jp->jp_value)[i] = strtol(avalue, &ep, 10); 385 goto integer_test; 386 case CTLTYPE_ULONG: 387 ((unsigned long *)jp->jp_value)[i] = 388 strtoul(avalue, &ep, 10); 389 goto integer_test; 390 case CTLTYPE_S64: 391 ((int64_t *)jp->jp_value)[i] = 392 strtoimax(avalue, &ep, 10); 393 goto integer_test; 394 case CTLTYPE_U64: 395 ((uint64_t *)jp->jp_value)[i] = 396 strtoumax(avalue, &ep, 10); 397 goto integer_test; 398 case CTLTYPE_STRUCT: 399 tvalue = alloca(fw + 1); 400 strlcpy(tvalue, avalue, fw + 1); 401 switch (jp->jp_structtype) { 402 case JPS_IN_ADDR: 403 if (inet_pton(AF_INET, tvalue, 404 &((struct in_addr *)jp->jp_value)[i]) != 1) 405 { 406 snprintf(jail_errmsg, 407 JAIL_ERRMSGLEN, 408 "%s: not an IPv4 address: %s", 409 jp->jp_name, tvalue); 410 errno = EINVAL; 411 goto error; 412 } 413 break; 414 case JPS_IN6_ADDR: 415 if (inet_pton(AF_INET6, tvalue, 416 &((struct in6_addr *)jp->jp_value)[i]) != 1) 417 { 418 snprintf(jail_errmsg, 419 JAIL_ERRMSGLEN, 420 "%s: not an IPv6 address: %s", 421 jp->jp_name, tvalue); 422 errno = EINVAL; 423 goto error; 424 } 425 break; 426 default: 427 goto unknown_type; 428 } 429 break; 430 default: 431 unknown_type: 432 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 433 "unknown type for %s", jp->jp_name); 434 errno = ENOENT; 435 goto error; 436 } 437 avalue += fw + 1; 438 } 439 return (0); 440 441 error: 442 free(jp->jp_value); 443 jp->jp_value = NULL; 444 return (-1); 445} 446 447static int 448jailparam_import_enum(const char **values, int nvalues, const char *valstr, 449 size_t valsize, int *value) 450{ 451 char *ep; 452 int i; 453 454 for (i = 0; i < nvalues; i++) 455 if (valsize == strlen(values[i]) && 456 !strncasecmp(valstr, values[i], valsize)) { 457 *value = i; 458 return 1; 459 } 460 *value = strtol(valstr, &ep, 10); 461 return (ep == valstr + valsize); 462} 463 464/* 465 * Put a name and value into a jail parameter element, copying the value 466 * but not altering it. 467 */ 468int 469jailparam_import_raw(struct jailparam *jp, void *value, size_t valuelen) 470{ 471 472 jp->jp_value = value; 473 jp->jp_valuelen = valuelen; 474 jp->jp_flags |= JP_RAWVALUE; 475 return (0); 476} 477 478/* 479 * Run the jail_set and jail_get system calls on a parameter list. 480 */ 481int 482jailparam_set(struct jailparam *jp, unsigned njp, int flags) 483{ 484 struct iovec *jiov; 485 char *nname; 486 int i, jid, bool0; 487 unsigned j; 488 489 jiov = alloca(sizeof(struct iovec) * 2 * (njp + 1)); 490 bool0 = 0; 491 for (i = j = 0; j < njp; j++) { 492 jiov[i].iov_base = jp[j].jp_name; 493 jiov[i].iov_len = strlen(jp[j].jp_name) + 1; 494 i++; 495 if (jp[j].jp_flags & (JP_BOOL | JP_NOBOOL)) { 496 /* 497 * Set booleans without values. If one has a value of 498 * zero, change it to (or from) its "no" counterpart. 499 */ 500 jiov[i].iov_base = NULL; 501 jiov[i].iov_len = 0; 502 if (jp[j].jp_value != NULL && 503 jp[j].jp_valuelen == sizeof(int) && 504 !*(int *)jp[j].jp_value) { 505 bool0 = 1; 506 nname = jp[j].jp_flags & JP_BOOL 507 ? noname(jp[j].jp_name) 508 : nononame(jp[j].jp_name); 509 if (nname == NULL) { 510 njp = j; 511 jid = -1; 512 goto done; 513 } 514 jiov[i - 1].iov_base = nname; 515 jiov[i - 1].iov_len = strlen(nname) + 1; 516 517 } 518 } else { 519 /* 520 * Try to fill in missing values with an empty string. 521 */ 522 if (jp[j].jp_value == NULL && jp[j].jp_valuelen > 0 && 523 jailparam_import(jp + j, "") < 0) { 524 njp = j; 525 jid = -1; 526 goto done; 527 } 528 jiov[i].iov_base = jp[j].jp_value; 529 jiov[i].iov_len = 530 (jp[j].jp_ctltype & CTLTYPE) == CTLTYPE_STRING 531 ? strlen(jp[j].jp_value) + 1 532 : jp[j].jp_valuelen; 533 } 534 i++; 535 } 536 *(const void **)&jiov[i].iov_base = "errmsg"; 537 jiov[i].iov_len = sizeof("errmsg"); 538 i++; 539 jiov[i].iov_base = jail_errmsg; 540 jiov[i].iov_len = JAIL_ERRMSGLEN; 541 i++; 542 jail_errmsg[0] = 0; 543 jid = jail_set(jiov, i, flags); 544 if (jid < 0 && !jail_errmsg[0]) 545 snprintf(jail_errmsg, sizeof(jail_errmsg), "jail_set: %s", 546 strerror(errno)); 547 done: 548 if (bool0) 549 for (j = 0; j < njp; j++) 550 if ((jp[j].jp_flags & (JP_BOOL | JP_NOBOOL)) && 551 jp[j].jp_value != NULL && 552 jp[j].jp_valuelen == sizeof(int) && 553 !*(int *)jp[j].jp_value) 554 free(jiov[j * 2].iov_base); 555 return (jid); 556} 557 558int 559jailparam_get(struct jailparam *jp, unsigned njp, int flags) 560{ 561 struct iovec *jiov; 562 struct jailparam *jp_lastjid, *jp_jid, *jp_name, *jp_key; 563 int i, ai, ki, jid, arrays, sanity; 564 unsigned j; 565 566 /* 567 * Get the types for all parameters. 568 * Find the key and any array parameters. 569 */ 570 jiov = alloca(sizeof(struct iovec) * 2 * (njp + 1)); 571 jp_lastjid = jp_jid = jp_name = NULL; 572 arrays = 0; 573 for (ai = j = 0; j < njp; j++) { 574 if (!strcmp(jp[j].jp_name, "lastjid")) 575 jp_lastjid = jp + j; 576 else if (!strcmp(jp[j].jp_name, "jid")) 577 jp_jid = jp + j; 578 else if (!strcmp(jp[j].jp_name, "name")) 579 jp_name = jp + j; 580 else if (jp[j].jp_elemlen && !(jp[j].jp_flags & JP_RAWVALUE)) { 581 arrays = 1; 582 jiov[ai].iov_base = jp[j].jp_name; 583 jiov[ai].iov_len = strlen(jp[j].jp_name) + 1; 584 ai++; 585 jiov[ai].iov_base = NULL; 586 jiov[ai].iov_len = 0; 587 ai++; 588 } 589 } 590 jp_key = jp_lastjid ? jp_lastjid : 591 jp_jid && jp_jid->jp_valuelen == sizeof(int) && 592 jp_jid->jp_value && *(int *)jp_jid->jp_value ? jp_jid : jp_name; 593 if (jp_key == NULL || jp_key->jp_value == NULL) { 594 strlcpy(jail_errmsg, "no jail specified", JAIL_ERRMSGLEN); 595 errno = ENOENT; 596 return (-1); 597 } 598 ki = ai; 599 jiov[ki].iov_base = jp_key->jp_name; 600 jiov[ki].iov_len = strlen(jp_key->jp_name) + 1; 601 ki++; 602 jiov[ki].iov_base = jp_key->jp_value; 603 jiov[ki].iov_len = (jp_key->jp_ctltype & CTLTYPE) == CTLTYPE_STRING 604 ? strlen(jp_key->jp_value) + 1 : jp_key->jp_valuelen; 605 ki++; 606 *(const void **)&jiov[ki].iov_base = "errmsg"; 607 jiov[ki].iov_len = sizeof("errmsg"); 608 ki++; 609 jiov[ki].iov_base = jail_errmsg; 610 jiov[ki].iov_len = JAIL_ERRMSGLEN; 611 ki++; 612 jail_errmsg[0] = 0; 613 if (arrays && jail_get(jiov, ki, flags) < 0) { 614 if (!jail_errmsg[0]) 615 snprintf(jail_errmsg, sizeof(jail_errmsg), 616 "jail_get: %s", strerror(errno)); 617 return (-1); 618 } 619 /* Allocate storage for all parameters. */ 620 for (ai = j = 0, i = ki; j < njp; j++) { 621 if (jp[j].jp_elemlen && !(jp[j].jp_flags & JP_RAWVALUE)) { 622 ai++; 623 jiov[ai].iov_len += jp[j].jp_elemlen * ARRAY_SLOP; 624 if (jp[j].jp_valuelen >= jiov[ai].iov_len) 625 jiov[ai].iov_len = jp[j].jp_valuelen; 626 else { 627 jp[j].jp_valuelen = jiov[ai].iov_len; 628 if (jp[j].jp_value != NULL) 629 free(jp[j].jp_value); 630 jp[j].jp_value = malloc(jp[j].jp_valuelen); 631 if (jp[j].jp_value == NULL) { 632 strerror_r(errno, jail_errmsg, 633 JAIL_ERRMSGLEN); 634 return (-1); 635 } 636 } 637 jiov[ai].iov_base = jp[j].jp_value; 638 memset(jiov[ai].iov_base, 0, jiov[ai].iov_len); 639 ai++; 640 } else if (jp + j != jp_key) { 641 jiov[i].iov_base = jp[j].jp_name; 642 jiov[i].iov_len = strlen(jp[j].jp_name) + 1; 643 i++; 644 if (jp[j].jp_value == NULL && 645 !(jp[j].jp_flags & JP_RAWVALUE)) { 646 jp[j].jp_value = malloc(jp[j].jp_valuelen); 647 if (jp[j].jp_value == NULL) { 648 strerror_r(errno, jail_errmsg, 649 JAIL_ERRMSGLEN); 650 return (-1); 651 } 652 } 653 jiov[i].iov_base = jp[j].jp_value; 654 jiov[i].iov_len = jp[j].jp_valuelen; 655 memset(jiov[i].iov_base, 0, jiov[i].iov_len); 656 i++; 657 } 658 } 659 /* 660 * Get the prison. If there are array elements, retry a few times 661 * in case their sizes changed from under us. 662 */ 663 for (sanity = 0;; sanity++) { 664 jid = jail_get(jiov, i, flags); 665 if (jid >= 0 || !arrays || sanity == ARRAY_SANITY || 666 errno != EINVAL || jail_errmsg[0]) 667 break; 668 for (ai = j = 0; j < njp; j++) { 669 if (jp[j].jp_elemlen && 670 !(jp[j].jp_flags & JP_RAWVALUE)) { 671 ai++; 672 jiov[ai].iov_base = NULL; 673 jiov[ai].iov_len = 0; 674 ai++; 675 } 676 } 677 if (jail_get(jiov, ki, flags) < 0) 678 break; 679 for (ai = j = 0; j < njp; j++) { 680 if (jp[j].jp_elemlen && 681 !(jp[j].jp_flags & JP_RAWVALUE)) { 682 ai++; 683 jiov[ai].iov_len += 684 jp[j].jp_elemlen * ARRAY_SLOP; 685 if (jp[j].jp_valuelen >= jiov[ai].iov_len) 686 jiov[ai].iov_len = jp[j].jp_valuelen; 687 else { 688 jp[j].jp_valuelen = jiov[ai].iov_len; 689 if (jp[j].jp_value != NULL) 690 free(jp[j].jp_value); 691 jp[j].jp_value = 692 malloc(jiov[ai].iov_len); 693 if (jp[j].jp_value == NULL) { 694 strerror_r(errno, jail_errmsg, 695 JAIL_ERRMSGLEN); 696 return (-1); 697 } 698 } 699 jiov[ai].iov_base = jp[j].jp_value; 700 memset(jiov[ai].iov_base, 0, jiov[ai].iov_len); 701 ai++; 702 } 703 } 704 } 705 if (jid < 0 && !jail_errmsg[0]) 706 snprintf(jail_errmsg, sizeof(jail_errmsg), 707 "jail_get: %s", strerror(errno)); 708 for (ai = j = 0, i = ki; j < njp; j++) { 709 if (jp[j].jp_elemlen && !(jp[j].jp_flags & JP_RAWVALUE)) { 710 ai++; 711 jp[j].jp_valuelen = jiov[ai].iov_len; 712 ai++; 713 } else if (jp + j != jp_key) { 714 i++; 715 jp[j].jp_valuelen = jiov[i].iov_len; 716 i++; 717 } 718 } 719 return (jid); 720} 721 722/* 723 * Convert a jail parameter's value to external form. 724 */ 725char * 726jailparam_export(struct jailparam *jp) 727{ 728 size_t *valuelens; 729 char *value, *tvalue, **values; 730 size_t valuelen; 731 int i, nval, ival; 732 char valbuf[INET6_ADDRSTRLEN]; 733 734 if ((jp->jp_ctltype & CTLTYPE) == CTLTYPE_STRING) { 735 value = strdup(jp->jp_value); 736 if (value == NULL) 737 strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN); 738 return (value); 739 } 740 nval = jp->jp_elemlen ? jp->jp_valuelen / jp->jp_elemlen : 1; 741 if (nval == 0) { 742 value = strdup(""); 743 if (value == NULL) 744 strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN); 745 return (value); 746 } 747 values = alloca(nval * sizeof(char *)); 748 valuelens = alloca(nval * sizeof(size_t)); 749 valuelen = 0; 750 for (i = 0; i < nval; i++) { 751 switch (jp->jp_ctltype & CTLTYPE) { 752 case CTLTYPE_INT: 753 ival = ((int *)jp->jp_value)[i]; 754 if ((jp->jp_flags & (JP_BOOL | JP_NOBOOL)) && 755 (unsigned)ival < 2) { 756 strlcpy(valbuf, bool_values[ival], 757 sizeof(valbuf)); 758 break; 759 } 760 if ((jp->jp_flags & JP_JAILSYS) && 761 (unsigned)ival < sizeof(jailsys_values) / 762 sizeof(jailsys_values[0])) { 763 strlcpy(valbuf, jailsys_values[ival], 764 sizeof(valbuf)); 765 break; 766 } 767 snprintf(valbuf, sizeof(valbuf), "%d", ival); 768 break; 769 case CTLTYPE_UINT: 770 snprintf(valbuf, sizeof(valbuf), "%u", 771 ((unsigned *)jp->jp_value)[i]); 772 break; 773 case CTLTYPE_LONG: 774 snprintf(valbuf, sizeof(valbuf), "%ld", 775 ((long *)jp->jp_value)[i]); 776 break; 777 case CTLTYPE_ULONG: 778 snprintf(valbuf, sizeof(valbuf), "%lu", 779 ((unsigned long *)jp->jp_value)[i]); 780 break; 781 case CTLTYPE_S64: 782 snprintf(valbuf, sizeof(valbuf), "%jd", 783 (intmax_t)((int64_t *)jp->jp_value)[i]); 784 break; 785 case CTLTYPE_U64: 786 snprintf(valbuf, sizeof(valbuf), "%ju", 787 (uintmax_t)((uint64_t *)jp->jp_value)[i]); 788 break; 789 case CTLTYPE_STRUCT: 790 switch (jp->jp_structtype) { 791 case JPS_IN_ADDR: 792 if (inet_ntop(AF_INET, 793 &((struct in_addr *)jp->jp_value)[i], 794 valbuf, sizeof(valbuf)) == NULL) { 795 strerror_r(errno, jail_errmsg, 796 JAIL_ERRMSGLEN); 797 return (NULL); 798 } 799 break; 800 case JPS_IN6_ADDR: 801 if (inet_ntop(AF_INET6, 802 &((struct in6_addr *)jp->jp_value)[i], 803 valbuf, sizeof(valbuf)) == NULL) { 804 strerror_r(errno, jail_errmsg, 805 JAIL_ERRMSGLEN); 806 return (NULL); 807 } 808 break; 809 default: 810 goto unknown_type; 811 } 812 break; 813 default: 814 unknown_type: 815 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 816 "unknown type for %s", jp->jp_name); 817 errno = ENOENT; 818 return (NULL); 819 } 820 valuelens[i] = strlen(valbuf) + 1; 821 valuelen += valuelens[i]; 822 values[i] = alloca(valuelens[i]); 823 strcpy(values[i], valbuf); 824 } 825 value = malloc(valuelen); 826 if (value == NULL) 827 strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN); 828 else { 829 tvalue = value; 830 for (i = 0; i < nval; i++) { 831 strcpy(tvalue, values[i]); 832 if (i < nval - 1) { 833 tvalue += valuelens[i]; 834 tvalue[-1] = ','; 835 } 836 } 837 } 838 return (value); 839} 840 841/* 842 * Free the contents of a jail parameter list (but not the list itself). 843 */ 844void 845jailparam_free(struct jailparam *jp, unsigned njp) 846{ 847 unsigned j; 848 849 for (j = 0; j < njp; j++) { 850 free(jp[j].jp_name); 851 if (!(jp[j].jp_flags & JP_RAWVALUE)) 852 free(jp[j].jp_value); 853 } 854} 855 856/* 857 * Find a parameter's type and size from its MIB. 858 */ 859static int 860jailparam_type(struct jailparam *jp) 861{ 862 char *p, *name, *nname; 863 size_t miblen, desclen; 864 int i, isarray; 865 struct { 866 int i; 867 char s[MAXPATHLEN]; 868 } desc; 869 int mib[CTL_MAXNAME]; 870 871 /* The "lastjid" parameter isn't real. */ 872 name = jp->jp_name; 873 if (!strcmp(name, "lastjid")) { 874 jp->jp_valuelen = sizeof(int); 875 jp->jp_ctltype = CTLTYPE_INT | CTLFLAG_WR; 876 return (0); 877 } 878 879 /* Find the sysctl that describes the parameter. */ 880 mib[0] = 0; 881 mib[1] = 3; 882 snprintf(desc.s, sizeof(desc.s), SJPARAM ".%s", name); 883 miblen = sizeof(mib) - 2 * sizeof(int); 884 if (sysctl(mib, 2, mib + 2, &miblen, desc.s, strlen(desc.s)) < 0) { 885 if (errno != ENOENT) { 886 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 887 "sysctl(0.3.%s): %s", name, strerror(errno)); 888 return (-1); 889 } 890 if (kldload_param(name) >= 0 && sysctl(mib, 2, mib + 2, &miblen, 891 desc.s, strlen(desc.s)) >= 0) 892 goto mib_desc; 893 /* 894 * The parameter probably doesn't exist. But it might be 895 * the "no" counterpart to a boolean. 896 */ 897 nname = nononame(name); 898 if (nname == NULL) { 899 unknown_parameter: 900 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 901 "unknown parameter: %s", jp->jp_name); 902 errno = ENOENT; 903 return (-1); 904 } 905 name = alloca(strlen(nname) + 1); 906 strcpy(name, nname); 907 free(nname); 908 snprintf(desc.s, sizeof(desc.s), SJPARAM ".%s", name); 909 miblen = sizeof(mib) - 2 * sizeof(int); 910 if (sysctl(mib, 2, mib + 2, &miblen, desc.s, 911 strlen(desc.s)) < 0) 912 goto unknown_parameter; 913 jp->jp_flags |= JP_NOBOOL; 914 } 915 mib_desc: 916 mib[1] = 4; 917 desclen = sizeof(desc); 918 if (sysctl(mib, (miblen / sizeof(int)) + 2, &desc, &desclen, 919 NULL, 0) < 0) { 920 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 921 "sysctl(0.4.%s): %s", name, strerror(errno)); 922 return (-1); 923 } 924 jp->jp_ctltype = desc.i; 925 /* If this came from removing a "no", it better be a boolean. */ 926 if (jp->jp_flags & JP_NOBOOL) { 927 if ((desc.i & CTLTYPE) == CTLTYPE_INT && desc.s[0] == 'B') { 928 jp->jp_valuelen = sizeof(int); 929 return (0); 930 } 931 else if ((desc.i & CTLTYPE) != CTLTYPE_NODE) 932 goto unknown_parameter; 933 } 934 /* See if this is an array type. */ 935 p = strchr(desc.s, '\0'); 936 isarray = 0; 937 if (p - 2 < desc.s || strcmp(p - 2, ",a")) 938 isarray = 0; 939 else { 940 isarray = 1; 941 p[-2] = 0; 942 } 943 /* Look for types we understand. */ 944 switch (desc.i & CTLTYPE) { 945 case CTLTYPE_INT: 946 if (desc.s[0] == 'B') 947 jp->jp_flags |= JP_BOOL; 948 else if (!strcmp(desc.s, "E,jailsys")) 949 jp->jp_flags |= JP_JAILSYS; 950 case CTLTYPE_UINT: 951 jp->jp_valuelen = sizeof(int); 952 break; 953 case CTLTYPE_LONG: 954 case CTLTYPE_ULONG: 955 jp->jp_valuelen = sizeof(long); 956 break; 957 case CTLTYPE_S64: 958 case CTLTYPE_U64: 959 jp->jp_valuelen = sizeof(int64_t); 960 break; 961 case CTLTYPE_STRING: 962 desc.s[0] = 0; 963 desclen = sizeof(desc.s); 964 if (sysctl(mib + 2, miblen / sizeof(int), desc.s, &desclen, 965 NULL, 0) < 0) { 966 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 967 "sysctl(" SJPARAM ".%s): %s", name, 968 strerror(errno)); 969 return (-1); 970 } 971 jp->jp_valuelen = strtoul(desc.s, NULL, 10); 972 break; 973 case CTLTYPE_STRUCT: 974 if (!strcmp(desc.s, "S,in_addr")) { 975 jp->jp_structtype = JPS_IN_ADDR; 976 jp->jp_valuelen = sizeof(struct in_addr); 977 } else if (!strcmp(desc.s, "S,in6_addr")) { 978 jp->jp_structtype = JPS_IN6_ADDR; 979 jp->jp_valuelen = sizeof(struct in6_addr); 980 } else { 981 desclen = 0; 982 if (sysctl(mib + 2, miblen / sizeof(int), 983 NULL, &jp->jp_valuelen, NULL, 0) < 0) { 984 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 985 "sysctl(" SJPARAM ".%s): %s", name, 986 strerror(errno)); 987 return (-1); 988 } 989 } 990 break; 991 case CTLTYPE_NODE: 992 /* 993 * A node might be described by an empty-named child, 994 * which would be immediately before or after the node itself. 995 */ 996 mib[1] = 1; 997 miblen += sizeof(int); 998 for (i = -1; i <= 1; i += 2) { 999 mib[(miblen / sizeof(int)) + 1] = 1000 mib[(miblen / sizeof(int))] + i; 1001 desclen = sizeof(desc.s); 1002 if (sysctl(mib, (miblen / sizeof(int)) + 2, desc.s, 1003 &desclen, NULL, 0) < 0) { 1004 if (errno == ENOENT) 1005 continue; 1006 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 1007 "sysctl(0.1): %s", strerror(errno)); 1008 return (-1); 1009 } 1010 if (desclen == sizeof(SJPARAM) + strlen(name) + 2 && 1011 memcmp(SJPARAM ".", desc.s, sizeof(SJPARAM)) == 0 && 1012 memcmp(name, desc.s + sizeof(SJPARAM), 1013 desclen - sizeof(SJPARAM) - 2) == 0 && 1014 desc.s[desclen - 2] == '.') 1015 goto mib_desc; 1016 } 1017 goto unknown_parameter; 1018 default: 1019 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 1020 "unknown type for %s", jp->jp_name); 1021 errno = ENOENT; 1022 return (-1); 1023 } 1024 if (isarray) { 1025 jp->jp_elemlen = jp->jp_valuelen; 1026 jp->jp_valuelen = 0; 1027 } 1028 return (0); 1029} 1030 1031/* 1032 * Attempt to load a kernel module matching an otherwise nonexistent parameter. 1033 */ 1034static int 1035kldload_param(const char *name) 1036{ 1037 int kl; 1038 1039 if (strcmp(name, "linux") == 0 || strncmp(name, "linux.", 6) == 0) 1040 kl = kldload("linux"); 1041 else if (strcmp(name, "sysvmsg") == 0 || strcmp(name, "sysvsem") == 0 || 1042 strcmp(name, "sysvshm") == 0) 1043 kl = kldload(name); 1044 else { 1045 errno = ENOENT; 1046 return (-1); 1047 } 1048 if (kl < 0 && errno == EEXIST) { 1049 /* 1050 * In the module is already loaded, then it must not contain 1051 * the parameter. 1052 */ 1053 errno = ENOENT; 1054 } 1055 return kl; 1056} 1057 1058/* 1059 * Change a boolean parameter name into its "no" counterpart or vice versa. 1060 */ 1061static char * 1062noname(const char *name) 1063{ 1064 char *nname, *p; 1065 1066 nname = malloc(strlen(name) + 3); 1067 if (nname == NULL) { 1068 strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN); 1069 return (NULL); 1070 } 1071 p = strrchr(name, '.'); 1072 if (p != NULL) 1073 sprintf(nname, "%.*s.no%s", (int)(p - name), name, p + 1); 1074 else 1075 sprintf(nname, "no%s", name); 1076 return (nname); 1077} 1078 1079static char * 1080nononame(const char *name) 1081{ 1082 char *p, *nname; 1083 1084 p = strrchr(name, '.'); 1085 if (strncmp(p ? p + 1 : name, "no", 2)) { 1086 snprintf(jail_errmsg, sizeof(jail_errmsg), 1087 "mismatched boolean: %s", name); 1088 errno = EINVAL; 1089 return (NULL); 1090 } 1091 nname = malloc(strlen(name) - 1); 1092 if (nname == NULL) { 1093 strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN); 1094 return (NULL); 1095 } 1096 if (p != NULL) 1097 sprintf(nname, "%.*s.%s", (int)(p - name), name, p + 3); 1098 else 1099 strcpy(nname, name + 2); 1100 return (nname); 1101} 1102