jail.c revision 212073
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: head/lib/libjail/jail.c 212073 2010-08-31 21:50:09Z jamie $"); 29 30#include <sys/param.h> 31#include <sys/types.h> 32#include <sys/jail.h> 33#include <sys/socket.h> 34#include <sys/sysctl.h> 35 36#include <arpa/inet.h> 37#include <netinet/in.h> 38 39#include <errno.h> 40#include <inttypes.h> 41#include <stdio.h> 42#include <stdarg.h> 43#include <stdlib.h> 44#include <string.h> 45 46#include "jail.h" 47 48#define SJPARAM "security.jail.param" 49 50#define JPS_IN_ADDR 1 51#define JPS_IN6_ADDR 2 52 53#define ARRAY_SANITY 5 54#define ARRAY_SLOP 5 55 56 57static int jailparam_import_enum(const char **values, int nvalues, 58 const char *valstr, size_t valsize, int *value); 59static int jailparam_type(struct jailparam *jp); 60static char *noname(const char *name); 61static char *nononame(const char *name); 62 63char jail_errmsg[JAIL_ERRMSGLEN]; 64 65static const char *bool_values[] = { "false", "true" }; 66static const char *jailsys_values[] = { "disable", "new", "inherit" }; 67 68 69/* 70 * Import a null-terminated parameter list and set a jail with the flags 71 * and parameters. 72 */ 73int 74jail_setv(int flags, ...) 75{ 76 va_list ap, tap; 77 struct jailparam *jp; 78 const char *name, *value; 79 int njp, jid; 80 81 /* Create the parameter list and import the parameters. */ 82 va_start(ap, flags); 83 va_copy(tap, ap); 84 for (njp = 0; va_arg(tap, char *) != NULL; njp++) 85 (void)va_arg(tap, char *); 86 va_end(tap); 87 jp = alloca(njp * sizeof(struct jailparam)); 88 for (njp = 0; (name = va_arg(ap, char *)) != NULL; njp++) { 89 value = va_arg(ap, char *); 90 if (jailparam_init(jp + njp, name) < 0 || 91 jailparam_import(jp + njp, value) < 0) { 92 jailparam_free(jp, njp); 93 va_end(ap); 94 return (-1); 95 } 96 } 97 va_end(ap); 98 jid = jailparam_set(jp, njp, flags); 99 jailparam_free(jp, njp); 100 return (jid); 101} 102 103/* 104 * Read a null-terminated parameter list, get the referenced jail, and export 105 * the parameters to the list. 106 */ 107int 108jail_getv(int flags, ...) 109{ 110 va_list ap, tap; 111 struct jailparam *jp, *jp_lastjid, *jp_jid, *jp_name, *jp_key; 112 char *valarg, *value; 113 const char *name, *key_value, *lastjid_value, *jid_value, *name_value; 114 int njp, i, jid; 115 116 /* Create the parameter list and find the key. */ 117 va_start(ap, flags); 118 va_copy(tap, ap); 119 for (njp = 0; va_arg(tap, char *) != NULL; njp++) 120 (void)va_arg(tap, char *); 121 va_end(tap); 122 123 jp = alloca(njp * sizeof(struct jailparam)); 124 va_copy(tap, ap); 125 jp_lastjid = jp_jid = jp_name = NULL; 126 lastjid_value = jid_value = name_value = NULL; 127 for (njp = 0; (name = va_arg(tap, char *)) != NULL; njp++) { 128 value = va_arg(tap, char *); 129 if (jailparam_init(jp + njp, name) < 0) { 130 va_end(tap); 131 goto error; 132 } 133 if (!strcmp(jp[njp].jp_name, "lastjid")) { 134 jp_lastjid = jp + njp; 135 lastjid_value = value; 136 } else if (!strcmp(jp[njp].jp_name, "jid")) { 137 jp_jid = jp + njp; 138 jid_value = value; 139 } if (!strcmp(jp[njp].jp_name, "name")) { 140 jp_name = jp + njp; 141 name_value = value; 142 } 143 } 144 va_end(tap); 145 /* Import the key parameter. */ 146 if (jp_lastjid != NULL) { 147 jp_key = jp_lastjid; 148 key_value = lastjid_value; 149 } else if (jp_jid != NULL && strtol(jid_value, NULL, 10) != 0) { 150 jp_key = jp_jid; 151 key_value = jid_value; 152 } else if (jp_name != NULL) { 153 jp_key = jp_name; 154 key_value = name_value; 155 } else { 156 strlcpy(jail_errmsg, "no jail specified", JAIL_ERRMSGLEN); 157 errno = ENOENT; 158 goto error; 159 } 160 if (jailparam_import(jp_key, key_value) < 0) 161 goto error; 162 /* Get the jail and export the parameters. */ 163 jid = jailparam_get(jp, njp, flags); 164 if (jid < 0) 165 goto error; 166 for (i = 0; i < njp; i++) { 167 (void)va_arg(ap, char *); 168 valarg = va_arg(ap, char *); 169 if (jp + i != jp_key) { 170 /* It's up to the caller to ensure there's room. */ 171 if ((jp[i].jp_ctltype & CTLTYPE) == CTLTYPE_STRING) 172 strcpy(valarg, jp[i].jp_value); 173 else { 174 value = jailparam_export(jp + i); 175 if (value == NULL) 176 goto error; 177 strcpy(valarg, value); 178 free(value); 179 } 180 } 181 } 182 jailparam_free(jp, njp); 183 va_end(ap); 184 return (jid); 185 186 error: 187 jailparam_free(jp, njp); 188 va_end(ap); 189 return (-1); 190} 191 192/* 193 * Return a list of all known parameters. 194 */ 195int 196jailparam_all(struct jailparam **jpp) 197{ 198 struct jailparam *jp; 199 size_t mlen1, mlen2, buflen; 200 int njp, nlist; 201 int mib1[CTL_MAXNAME], mib2[CTL_MAXNAME - 2]; 202 char buf[MAXPATHLEN]; 203 204 njp = 0; 205 nlist = 32; 206 jp = malloc(nlist * sizeof(*jp)); 207 if (jp == NULL) { 208 strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN); 209 return (-1); 210 } 211 mib1[0] = 0; 212 mib1[1] = 2; 213 mlen1 = CTL_MAXNAME - 2; 214 if (sysctlnametomib(SJPARAM, mib1 + 2, &mlen1) < 0) { 215 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 216 "sysctlnametomib(" SJPARAM "): %s", strerror(errno)); 217 goto error; 218 } 219 for (;; njp++) { 220 /* Get the next parameter. */ 221 mlen2 = sizeof(mib2); 222 if (sysctl(mib1, mlen1 + 2, mib2, &mlen2, NULL, 0) < 0) { 223 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 224 "sysctl(0.2): %s", strerror(errno)); 225 goto error; 226 } 227 if (mib2[0] != mib1[2] || mib2[1] != mib1[3] || 228 mib2[2] != mib1[4]) 229 break; 230 /* Convert it to an ascii name. */ 231 memcpy(mib1 + 2, mib2, mlen2); 232 mlen1 = mlen2 / sizeof(int); 233 mib1[1] = 1; 234 buflen = sizeof(buf); 235 if (sysctl(mib1, mlen1 + 2, buf, &buflen, NULL, 0) < 0) { 236 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 237 "sysctl(0.1): %s", strerror(errno)); 238 goto error; 239 } 240 if (buf[buflen - 2] == '.') 241 buf[buflen - 2] = '\0'; 242 /* Add the parameter to the list */ 243 if (njp >= nlist) { 244 nlist *= 2; 245 jp = realloc(jp, nlist * sizeof(*jp)); 246 if (jp == NULL) { 247 jailparam_free(jp, njp); 248 return (-1); 249 } 250 } 251 if (jailparam_init(jp + njp, buf + sizeof(SJPARAM)) < 0) 252 goto error; 253 if (jailparam_type(jp + njp) < 0) { 254 njp++; 255 goto error; 256 } 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 return (0); 283} 284 285/* 286 * Put a name and value into a jail parameter element, converting the value 287 * to internal form. 288 */ 289int 290jailparam_import(struct jailparam *jp, const char *value) 291{ 292 char *p, *ep, *tvalue; 293 const char *avalue; 294 int i, nval, fw; 295 296 if (!jp->jp_ctltype && jailparam_type(jp) < 0) 297 return (-1); 298 if (value == NULL) 299 return (0); 300 if ((jp->jp_ctltype & CTLTYPE) == CTLTYPE_STRING) { 301 jp->jp_value = strdup(value); 302 if (jp->jp_value == NULL) { 303 strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN); 304 return (-1); 305 } 306 return (0); 307 } 308 nval = 1; 309 if (jp->jp_elemlen) { 310 if (value[0] == '\0' || (value[0] == '-' && value[1] == '\0')) { 311 jp->jp_value = strdup(""); 312 if (jp->jp_value == NULL) { 313 strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN); 314 return (-1); 315 } 316 jp->jp_valuelen = 0; 317 return (0); 318 } 319 for (p = strchr(value, ','); p; p = strchr(p + 1, ',')) 320 nval++; 321 jp->jp_valuelen = jp->jp_elemlen * nval; 322 } 323 jp->jp_value = malloc(jp->jp_valuelen); 324 if (jp->jp_value == NULL) { 325 strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN); 326 return (-1); 327 } 328 avalue = value; 329 for (i = 0; i < nval; i++) { 330 fw = nval == 1 ? strlen(avalue) : strcspn(avalue, ","); 331 switch (jp->jp_ctltype & CTLTYPE) { 332 case CTLTYPE_INT: 333 if (jp->jp_flags & (JP_BOOL | JP_NOBOOL)) { 334 if (!jailparam_import_enum(bool_values, 2, 335 avalue, fw, &((int *)jp->jp_value)[i])) { 336 snprintf(jail_errmsg, 337 JAIL_ERRMSGLEN, "%s: " 338 "unknown boolean value \"%.*s\"", 339 jp->jp_name, fw, avalue); 340 errno = EINVAL; 341 goto error; 342 } 343 break; 344 } 345 if (jp->jp_flags & JP_JAILSYS) { 346 /* 347 * Allow setting a jailsys parameter to "new" 348 * in a booleanesque fashion. 349 */ 350 if (value[0] == '\0') 351 ((int *)jp->jp_value)[i] = JAIL_SYS_NEW; 352 else if (!jailparam_import_enum(jailsys_values, 353 sizeof(jailsys_values) / 354 sizeof(jailsys_values[0]), avalue, fw, 355 &((int *)jp->jp_value)[i])) { 356 snprintf(jail_errmsg, 357 JAIL_ERRMSGLEN, "%s: " 358 "unknown jailsys value \"%.*s\"", 359 jp->jp_name, fw, avalue); 360 errno = EINVAL; 361 goto error; 362 } 363 break; 364 } 365 ((int *)jp->jp_value)[i] = strtol(avalue, &ep, 10); 366 integer_test: 367 if (ep != avalue + fw) { 368 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 369 "%s: non-integer value \"%.*s\"", 370 jp->jp_name, fw, avalue); 371 errno = EINVAL; 372 goto error; 373 } 374 break; 375 case CTLTYPE_UINT: 376 ((unsigned *)jp->jp_value)[i] = 377 strtoul(avalue, &ep, 10); 378 goto integer_test; 379 case CTLTYPE_LONG: 380 ((long *)jp->jp_value)[i] = strtol(avalue, &ep, 10); 381 goto integer_test; 382 case CTLTYPE_ULONG: 383 ((unsigned long *)jp->jp_value)[i] = 384 strtoul(avalue, &ep, 10); 385 goto integer_test; 386 case CTLTYPE_QUAD: 387 ((int64_t *)jp->jp_value)[i] = 388 strtoimax(avalue, &ep, 10); 389 goto integer_test; 390 case CTLTYPE_STRUCT: 391 tvalue = alloca(fw + 1); 392 strlcpy(tvalue, avalue, fw + 1); 393 switch (jp->jp_structtype) { 394 case JPS_IN_ADDR: 395 if (inet_pton(AF_INET, tvalue, 396 &((struct in_addr *)jp->jp_value)[i]) != 1) 397 { 398 snprintf(jail_errmsg, 399 JAIL_ERRMSGLEN, 400 "%s: not an IPv4 address: %s", 401 jp->jp_name, tvalue); 402 errno = EINVAL; 403 goto error; 404 } 405 break; 406 case JPS_IN6_ADDR: 407 if (inet_pton(AF_INET6, tvalue, 408 &((struct in6_addr *)jp->jp_value)[i]) != 1) 409 { 410 snprintf(jail_errmsg, 411 JAIL_ERRMSGLEN, 412 "%s: not an IPv6 address: %s", 413 jp->jp_name, tvalue); 414 errno = EINVAL; 415 goto error; 416 } 417 break; 418 default: 419 goto unknown_type; 420 } 421 break; 422 default: 423 unknown_type: 424 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 425 "unknown type for %s", jp->jp_name); 426 errno = ENOENT; 427 goto error; 428 } 429 avalue += fw + 1; 430 } 431 return (0); 432 433 error: 434 free(jp->jp_value); 435 jp->jp_value = NULL; 436 return (-1); 437} 438 439static int 440jailparam_import_enum(const char **values, int nvalues, const char *valstr, 441 size_t valsize, int *value) 442{ 443 char *ep; 444 int i; 445 446 for (i = 0; i < nvalues; i++) 447 if (valsize == strlen(values[i]) && 448 !strncasecmp(valstr, values[i], valsize)) { 449 *value = i; 450 return 1; 451 } 452 *value = strtol(valstr, &ep, 10); 453 return (ep == valstr + valsize); 454} 455 456/* 457 * Put a name and value into a jail parameter element, copying the value 458 * but not altering it. 459 */ 460int 461jailparam_import_raw(struct jailparam *jp, void *value, size_t valuelen) 462{ 463 464 jp->jp_value = value; 465 jp->jp_valuelen = valuelen; 466 jp->jp_flags |= JP_RAWVALUE; 467 return (0); 468} 469 470/* 471 * Run the jail_set and jail_get system calls on a parameter list. 472 */ 473int 474jailparam_set(struct jailparam *jp, unsigned njp, int flags) 475{ 476 struct iovec *jiov; 477 char *nname; 478 int i, jid, bool0; 479 unsigned j; 480 481 jiov = alloca(sizeof(struct iovec) * 2 * (njp + 1)); 482 bool0 = 0; 483 for (i = j = 0; j < njp; j++) { 484 jiov[i].iov_base = jp[j].jp_name; 485 jiov[i].iov_len = strlen(jp[j].jp_name) + 1; 486 i++; 487 if (jp[j].jp_flags & (JP_BOOL | JP_NOBOOL)) { 488 /* 489 * Set booleans without values. If one has a value of 490 * zero, change it to (or from) its "no" counterpart. 491 */ 492 jiov[i].iov_base = NULL; 493 jiov[i].iov_len = 0; 494 if (jp[j].jp_value != NULL && 495 jp[j].jp_valuelen == sizeof(int) && 496 !*(int *)jp[j].jp_value) { 497 bool0 = 1; 498 nname = jp[j].jp_flags & JP_BOOL 499 ? noname(jp[j].jp_name) 500 : nononame(jp[j].jp_name); 501 if (nname == NULL) { 502 njp = j; 503 jid = -1; 504 goto done; 505 } 506 jiov[i - 1].iov_base = nname; 507 jiov[i - 1].iov_len = strlen(nname) + 1; 508 509 } 510 } else { 511 /* 512 * Try to fill in missing values with an empty string. 513 */ 514 if (jp[j].jp_value == NULL && jp[j].jp_valuelen > 0 && 515 jailparam_import(jp + j, "") < 0) { 516 njp = j; 517 jid = -1; 518 goto done; 519 } 520 jiov[i].iov_base = jp[j].jp_value; 521 jiov[i].iov_len = 522 (jp[j].jp_ctltype & CTLTYPE) == CTLTYPE_STRING 523 ? strlen(jp[j].jp_value) + 1 524 : jp[j].jp_valuelen; 525 } 526 i++; 527 } 528 *(const void **)&jiov[i].iov_base = "errmsg"; 529 jiov[i].iov_len = sizeof("errmsg"); 530 i++; 531 jiov[i].iov_base = jail_errmsg; 532 jiov[i].iov_len = JAIL_ERRMSGLEN; 533 i++; 534 jail_errmsg[0] = 0; 535 jid = jail_set(jiov, i, flags); 536 if (jid < 0 && !jail_errmsg[0]) 537 snprintf(jail_errmsg, sizeof(jail_errmsg), "jail_set: %s", 538 strerror(errno)); 539 done: 540 if (bool0) 541 for (j = 0; j < njp; j++) 542 if ((jp[j].jp_flags & (JP_BOOL | JP_NOBOOL)) && 543 jp[j].jp_value != NULL && 544 jp[j].jp_valuelen == sizeof(int) && 545 !*(int *)jp[j].jp_value) 546 free(jiov[j * 2].iov_base); 547 return (jid); 548} 549 550int 551jailparam_get(struct jailparam *jp, unsigned njp, int flags) 552{ 553 struct iovec *jiov; 554 struct jailparam *jp_lastjid, *jp_jid, *jp_name, *jp_key; 555 int i, ai, ki, jid, arrays, sanity; 556 unsigned j; 557 558 /* 559 * Get the types for all parameters. 560 * Find the key and any array parameters. 561 */ 562 jiov = alloca(sizeof(struct iovec) * 2 * (njp + 1)); 563 jp_lastjid = jp_jid = jp_name = NULL; 564 arrays = 0; 565 for (ai = j = 0; j < njp; j++) { 566 if (!jp[j].jp_ctltype && jailparam_type(jp + j) < 0) 567 return (-1); 568 if (!strcmp(jp[j].jp_name, "lastjid")) 569 jp_lastjid = jp + j; 570 else if (!strcmp(jp[j].jp_name, "jid")) 571 jp_jid = jp + j; 572 else if (!strcmp(jp[j].jp_name, "name")) 573 jp_name = jp + j; 574 else if (jp[j].jp_elemlen && !(jp[j].jp_flags & JP_RAWVALUE)) { 575 arrays = 1; 576 jiov[ai].iov_base = jp[j].jp_name; 577 jiov[ai].iov_len = strlen(jp[j].jp_name) + 1; 578 ai++; 579 jiov[ai].iov_base = NULL; 580 jiov[ai].iov_len = 0; 581 ai++; 582 } 583 } 584 jp_key = jp_lastjid ? jp_lastjid : 585 jp_jid && jp_jid->jp_valuelen == sizeof(int) && 586 jp_jid->jp_value && *(int *)jp_jid->jp_value ? jp_jid : jp_name; 587 if (jp_key == NULL || jp_key->jp_value == NULL) { 588 strlcpy(jail_errmsg, "no jail specified", JAIL_ERRMSGLEN); 589 errno = ENOENT; 590 return (-1); 591 } 592 ki = ai; 593 jiov[ki].iov_base = jp_key->jp_name; 594 jiov[ki].iov_len = strlen(jp_key->jp_name) + 1; 595 ki++; 596 jiov[ki].iov_base = jp_key->jp_value; 597 jiov[ki].iov_len = (jp_key->jp_ctltype & CTLTYPE) == CTLTYPE_STRING 598 ? strlen(jp_key->jp_value) + 1 : jp_key->jp_valuelen; 599 ki++; 600 *(const void **)&jiov[ki].iov_base = "errmsg"; 601 jiov[ki].iov_len = sizeof("errmsg"); 602 ki++; 603 jiov[ki].iov_base = jail_errmsg; 604 jiov[ki].iov_len = JAIL_ERRMSGLEN; 605 ki++; 606 jail_errmsg[0] = 0; 607 if (arrays && jail_get(jiov, ki, flags) < 0) { 608 if (!jail_errmsg[0]) 609 snprintf(jail_errmsg, sizeof(jail_errmsg), 610 "jail_get: %s", strerror(errno)); 611 return (-1); 612 } 613 /* Allocate storage for all parameters. */ 614 for (ai = j = 0, i = ki; j < njp; j++) { 615 if (jp[j].jp_elemlen && !(jp[j].jp_flags & JP_RAWVALUE)) { 616 ai++; 617 jiov[ai].iov_len += jp[j].jp_elemlen * ARRAY_SLOP; 618 if (jp[j].jp_valuelen >= jiov[ai].iov_len) 619 jiov[ai].iov_len = jp[j].jp_valuelen; 620 else { 621 jp[j].jp_valuelen = jiov[ai].iov_len; 622 if (jp[j].jp_value != NULL) 623 free(jp[j].jp_value); 624 jp[j].jp_value = malloc(jp[j].jp_valuelen); 625 if (jp[j].jp_value == NULL) { 626 strerror_r(errno, jail_errmsg, 627 JAIL_ERRMSGLEN); 628 return (-1); 629 } 630 } 631 jiov[ai].iov_base = jp[j].jp_value; 632 memset(jiov[ai].iov_base, 0, jiov[ai].iov_len); 633 ai++; 634 } else if (jp + j != jp_key) { 635 jiov[i].iov_base = jp[j].jp_name; 636 jiov[i].iov_len = strlen(jp[j].jp_name) + 1; 637 i++; 638 if (jp[j].jp_value == NULL && 639 !(jp[j].jp_flags & JP_RAWVALUE)) { 640 jp[j].jp_value = malloc(jp[j].jp_valuelen); 641 if (jp[j].jp_value == NULL) { 642 strerror_r(errno, jail_errmsg, 643 JAIL_ERRMSGLEN); 644 return (-1); 645 } 646 } 647 jiov[i].iov_base = jp[j].jp_value; 648 jiov[i].iov_len = jp[j].jp_valuelen; 649 memset(jiov[i].iov_base, 0, jiov[i].iov_len); 650 i++; 651 } 652 } 653 /* 654 * Get the prison. If there are array elements, retry a few times 655 * in case their sizes changed from under us. 656 */ 657 for (sanity = 0;; sanity++) { 658 jid = jail_get(jiov, i, flags); 659 if (jid >= 0 || !arrays || sanity == ARRAY_SANITY || 660 errno != EINVAL || jail_errmsg[0]) 661 break; 662 for (ai = j = 0; j < njp; j++) { 663 if (jp[j].jp_elemlen && 664 !(jp[j].jp_flags & JP_RAWVALUE)) { 665 ai++; 666 jiov[ai].iov_base = NULL; 667 jiov[ai].iov_len = 0; 668 ai++; 669 } 670 } 671 if (jail_get(jiov, ki, flags) < 0) 672 break; 673 for (ai = j = 0; j < njp; j++) { 674 if (jp[j].jp_elemlen && 675 !(jp[j].jp_flags & JP_RAWVALUE)) { 676 ai++; 677 jiov[ai].iov_len += 678 jp[j].jp_elemlen * ARRAY_SLOP; 679 if (jp[j].jp_valuelen >= jiov[ai].iov_len) 680 jiov[ai].iov_len = jp[j].jp_valuelen; 681 else { 682 jp[j].jp_valuelen = jiov[ai].iov_len; 683 if (jp[j].jp_value != NULL) 684 free(jp[j].jp_value); 685 jp[j].jp_value = 686 malloc(jiov[ai].iov_len); 687 if (jp[j].jp_value == NULL) { 688 strerror_r(errno, jail_errmsg, 689 JAIL_ERRMSGLEN); 690 return (-1); 691 } 692 } 693 jiov[ai].iov_base = jp[j].jp_value; 694 memset(jiov[ai].iov_base, 0, jiov[ai].iov_len); 695 ai++; 696 } 697 } 698 } 699 if (jid < 0 && !jail_errmsg[0]) 700 snprintf(jail_errmsg, sizeof(jail_errmsg), 701 "jail_get: %s", strerror(errno)); 702 for (ai = j = 0, i = ki; j < njp; j++) { 703 if (jp[j].jp_elemlen && !(jp[j].jp_flags & JP_RAWVALUE)) { 704 ai++; 705 jp[j].jp_valuelen = jiov[ai].iov_len; 706 ai++; 707 } else if (jp + j != jp_key) { 708 i++; 709 jp[j].jp_valuelen = jiov[i].iov_len; 710 i++; 711 } 712 } 713 return (jid); 714} 715 716/* 717 * Convert a jail parameter's value to external form. 718 */ 719char * 720jailparam_export(struct jailparam *jp) 721{ 722 size_t *valuelens; 723 char *value, *tvalue, **values; 724 size_t valuelen; 725 int i, nval, ival; 726 char valbuf[INET6_ADDRSTRLEN]; 727 728 if (!jp->jp_ctltype && jailparam_type(jp) < 0) 729 return (NULL); 730 if ((jp->jp_ctltype & CTLTYPE) == CTLTYPE_STRING) { 731 value = strdup(jp->jp_value); 732 if (value == NULL) 733 strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN); 734 return (value); 735 } 736 nval = jp->jp_elemlen ? jp->jp_valuelen / jp->jp_elemlen : 1; 737 if (nval == 0) { 738 value = strdup(""); 739 if (value == NULL) 740 strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN); 741 return (value); 742 } 743 values = alloca(nval * sizeof(char *)); 744 valuelens = alloca(nval * sizeof(size_t)); 745 valuelen = 0; 746 for (i = 0; i < nval; i++) { 747 switch (jp->jp_ctltype & CTLTYPE) { 748 case CTLTYPE_INT: 749 ival = ((int *)jp->jp_value)[i]; 750 if ((jp->jp_flags & (JP_BOOL | JP_NOBOOL)) && 751 (unsigned)ival < 2) { 752 strlcpy(valbuf, bool_values[ival], 753 sizeof(valbuf)); 754 break; 755 } 756 if ((jp->jp_flags & JP_JAILSYS) && 757 (unsigned)ival < sizeof(jailsys_values) / 758 sizeof(jailsys_values[0])) { 759 strlcpy(valbuf, jailsys_values[ival], 760 sizeof(valbuf)); 761 break; 762 } 763 snprintf(valbuf, sizeof(valbuf), "%d", ival); 764 break; 765 case CTLTYPE_UINT: 766 snprintf(valbuf, sizeof(valbuf), "%u", 767 ((unsigned *)jp->jp_value)[i]); 768 break; 769 case CTLTYPE_LONG: 770 snprintf(valbuf, sizeof(valbuf), "%ld", 771 ((long *)jp->jp_value)[i]); 772 break; 773 case CTLTYPE_ULONG: 774 snprintf(valbuf, sizeof(valbuf), "%lu", 775 ((unsigned long *)jp->jp_value)[i]); 776 break; 777 case CTLTYPE_QUAD: 778 snprintf(valbuf, sizeof(valbuf), "%jd", 779 (intmax_t)((int64_t *)jp->jp_value)[i]); 780 break; 781 case CTLTYPE_STRUCT: 782 switch (jp->jp_structtype) { 783 case JPS_IN_ADDR: 784 if (inet_ntop(AF_INET, 785 &((struct in_addr *)jp->jp_value)[i], 786 valbuf, sizeof(valbuf)) == NULL) { 787 strerror_r(errno, jail_errmsg, 788 JAIL_ERRMSGLEN); 789 790 return (NULL); 791 } 792 break; 793 case JPS_IN6_ADDR: 794 if (inet_ntop(AF_INET6, 795 &((struct in6_addr *)jp->jp_value)[i], 796 valbuf, sizeof(valbuf)) == NULL) { 797 strerror_r(errno, jail_errmsg, 798 JAIL_ERRMSGLEN); 799 800 return (NULL); 801 } 802 break; 803 default: 804 goto unknown_type; 805 } 806 break; 807 default: 808 unknown_type: 809 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 810 "unknown type for %s", jp->jp_name); 811 errno = ENOENT; 812 return (NULL); 813 } 814 valuelens[i] = strlen(valbuf) + 1; 815 valuelen += valuelens[i]; 816 values[i] = alloca(valuelens[i]); 817 strcpy(values[i], valbuf); 818 } 819 value = malloc(valuelen); 820 if (value == NULL) 821 strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN); 822 else { 823 tvalue = value; 824 for (i = 0; i < nval; i++) { 825 strcpy(tvalue, values[i]); 826 if (i < nval - 1) { 827 tvalue += valuelens[i]; 828 tvalue[-1] = ','; 829 } 830 } 831 } 832 return (value); 833} 834 835/* 836 * Free the contents of a jail parameter list (but not the list itself). 837 */ 838void 839jailparam_free(struct jailparam *jp, unsigned njp) 840{ 841 unsigned j; 842 843 for (j = 0; j < njp; j++) { 844 free(jp[j].jp_name); 845 if (!(jp[j].jp_flags & JP_RAWVALUE)) 846 free(jp[j].jp_value); 847 } 848} 849 850/* 851 * Find a parameter's type and size from its MIB. 852 */ 853static int 854jailparam_type(struct jailparam *jp) 855{ 856 char *p, *nname; 857 size_t miblen, desclen; 858 int isarray; 859 struct { 860 int i; 861 char s[MAXPATHLEN]; 862 } desc; 863 int mib[CTL_MAXNAME]; 864 865 /* The "lastjid" parameter isn't real. */ 866 if (!strcmp(jp->jp_name, "lastjid")) { 867 jp->jp_valuelen = sizeof(int); 868 jp->jp_ctltype = CTLTYPE_INT | CTLFLAG_WR; 869 return (0); 870 } 871 872 /* Find the sysctl that describes the parameter. */ 873 mib[0] = 0; 874 mib[1] = 3; 875 snprintf(desc.s, sizeof(desc.s), SJPARAM ".%s", jp->jp_name); 876 miblen = sizeof(mib) - 2 * sizeof(int); 877 if (sysctl(mib, 2, mib + 2, &miblen, desc.s, strlen(desc.s)) < 0) { 878 if (errno != ENOENT) { 879 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 880 "sysctl(0.3.%s): %s", jp->jp_name, strerror(errno)); 881 return (-1); 882 } 883 /* 884 * The parameter probably doesn't exist. But it might be 885 * the "no" counterpart to a boolean. 886 */ 887 nname = nononame(jp->jp_name); 888 if (nname != NULL) { 889 snprintf(desc.s, sizeof(desc.s), SJPARAM ".%s", nname); 890 free(nname); 891 miblen = sizeof(mib) - 2 * sizeof(int); 892 if (sysctl(mib, 2, mib + 2, &miblen, desc.s, 893 strlen(desc.s)) >= 0) { 894 mib[1] = 4; 895 desclen = sizeof(desc); 896 if (sysctl(mib, (miblen / sizeof(int)) + 2, 897 &desc, &desclen, NULL, 0) < 0) { 898 snprintf(jail_errmsg, 899 JAIL_ERRMSGLEN, 900 "sysctl(0.4.%s): %s", desc.s, 901 strerror(errno)); 902 return (-1); 903 } 904 if ((desc.i & CTLTYPE) == CTLTYPE_INT && 905 desc.s[0] == 'B') { 906 jp->jp_ctltype = desc.i; 907 jp->jp_flags |= JP_NOBOOL; 908 jp->jp_valuelen = sizeof(int); 909 return (0); 910 } 911 } 912 } 913 unknown_parameter: 914 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 915 "unknown parameter: %s", jp->jp_name); 916 errno = ENOENT; 917 return (-1); 918 } 919 mib_desc: 920 mib[1] = 4; 921 desclen = sizeof(desc); 922 if (sysctl(mib, (miblen / sizeof(int)) + 2, &desc, &desclen, 923 NULL, 0) < 0) { 924 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 925 "sysctl(0.4.%s): %s", jp->jp_name, strerror(errno)); 926 return (-1); 927 } 928 /* See if this is an array type. */ 929 p = strchr(desc.s, '\0'); 930 isarray = 0; 931 if (p - 2 < desc.s || strcmp(p - 2, ",a")) 932 isarray = 0; 933 else { 934 isarray = 1; 935 p[-2] = 0; 936 } 937 /* Look for types we understand */ 938 jp->jp_ctltype = desc.i; 939 switch (desc.i & CTLTYPE) { 940 case CTLTYPE_INT: 941 if (desc.s[0] == 'B') 942 jp->jp_flags |= JP_BOOL; 943 else if (!strcmp(desc.s, "E,jailsys")) 944 jp->jp_flags |= JP_JAILSYS; 945 case CTLTYPE_UINT: 946 jp->jp_valuelen = sizeof(int); 947 break; 948 case CTLTYPE_LONG: 949 case CTLTYPE_ULONG: 950 jp->jp_valuelen = sizeof(long); 951 break; 952 case CTLTYPE_QUAD: 953 jp->jp_valuelen = sizeof(int64_t); 954 break; 955 case CTLTYPE_STRING: 956 desc.s[0] = 0; 957 desclen = sizeof(desc.s); 958 if (sysctl(mib + 2, miblen / sizeof(int), desc.s, &desclen, 959 NULL, 0) < 0) { 960 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 961 "sysctl(" SJPARAM ".%s): %s", jp->jp_name, 962 strerror(errno)); 963 return (-1); 964 } 965 jp->jp_valuelen = strtoul(desc.s, NULL, 10); 966 break; 967 case CTLTYPE_STRUCT: 968 if (!strcmp(desc.s, "S,in_addr")) { 969 jp->jp_structtype = JPS_IN_ADDR; 970 jp->jp_valuelen = sizeof(struct in_addr); 971 } else if (!strcmp(desc.s, "S,in6_addr")) { 972 jp->jp_structtype = JPS_IN6_ADDR; 973 jp->jp_valuelen = sizeof(struct in6_addr); 974 } else { 975 desclen = 0; 976 if (sysctl(mib + 2, miblen / sizeof(int), 977 NULL, &jp->jp_valuelen, NULL, 0) < 0) { 978 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 979 "sysctl(" SJPARAM ".%s): %s", jp->jp_name, 980 strerror(errno)); 981 return (-1); 982 } 983 } 984 break; 985 case CTLTYPE_NODE: 986 /* A node might be described by an empty-named child. */ 987 mib[1] = 1; 988 mib[(miblen / sizeof(int)) + 2] = 989 mib[(miblen / sizeof(int)) + 1] - 1; 990 miblen += sizeof(int); 991 desclen = sizeof(desc.s); 992 if (sysctl(mib, (miblen / sizeof(int)) + 2, desc.s, &desclen, 993 NULL, 0) < 0) { 994 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 995 "sysctl(0.1): %s", strerror(errno)); 996 return (-1); 997 } 998 if (desc.s[desclen - 2] != '.') 999 goto unknown_parameter; 1000 goto mib_desc; 1001 default: 1002 snprintf(jail_errmsg, JAIL_ERRMSGLEN, 1003 "unknown type for %s", jp->jp_name); 1004 errno = ENOENT; 1005 return (-1); 1006 } 1007 if (isarray) { 1008 jp->jp_elemlen = jp->jp_valuelen; 1009 jp->jp_valuelen = 0; 1010 } 1011 return (0); 1012} 1013 1014/* 1015 * Change a boolean parameter name into its "no" counterpart or vice versa. 1016 */ 1017static char * 1018noname(const char *name) 1019{ 1020 char *nname, *p; 1021 1022 nname = malloc(strlen(name) + 3); 1023 if (nname == NULL) { 1024 strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN); 1025 return (NULL); 1026 } 1027 p = strrchr(name, '.'); 1028 if (p != NULL) 1029 sprintf(nname, "%.*s.no%s", (int)(p - name), name, p + 1); 1030 else 1031 sprintf(nname, "no%s", name); 1032 return (nname); 1033} 1034 1035static char * 1036nononame(const char *name) 1037{ 1038 char *p, *nname; 1039 1040 p = strrchr(name, '.'); 1041 if (strncmp(p ? p + 1 : name, "no", 2)) { 1042 snprintf(jail_errmsg, sizeof(jail_errmsg), 1043 "mismatched boolean: %s", name); 1044 errno = EINVAL; 1045 return (NULL); 1046 } 1047 nname = malloc(strlen(name) - 1); 1048 if (nname == NULL) { 1049 strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN); 1050 return (NULL); 1051 } 1052 if (p != NULL) 1053 sprintf(nname, "%.*s.%s", (int)(p - name), name, p + 3); 1054 else 1055 strcpy(nname, name + 2); 1056 return (nname); 1057} 1058