kern_jail.c revision 211085
1/*- 2 * Copyright (c) 1999 Poul-Henning Kamp. 3 * Copyright (c) 2008 Bjoern A. Zeeb. 4 * Copyright (c) 2009 James Gritton. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: head/sys/kern/kern_jail.c 211085 2010-08-08 23:22:55Z jamie $"); 31 32#include "opt_compat.h" 33#include "opt_ddb.h" 34#include "opt_inet.h" 35#include "opt_inet6.h" 36 37#include <sys/param.h> 38#include <sys/types.h> 39#include <sys/kernel.h> 40#include <sys/systm.h> 41#include <sys/errno.h> 42#include <sys/sysproto.h> 43#include <sys/malloc.h> 44#include <sys/osd.h> 45#include <sys/priv.h> 46#include <sys/proc.h> 47#include <sys/taskqueue.h> 48#include <sys/fcntl.h> 49#include <sys/jail.h> 50#include <sys/lock.h> 51#include <sys/mutex.h> 52#include <sys/sx.h> 53#include <sys/sysent.h> 54#include <sys/namei.h> 55#include <sys/mount.h> 56#include <sys/queue.h> 57#include <sys/socket.h> 58#include <sys/syscallsubr.h> 59#include <sys/sysctl.h> 60#include <sys/vnode.h> 61 62#include <net/if.h> 63#include <net/vnet.h> 64 65#include <netinet/in.h> 66 67#ifdef DDB 68#include <ddb/ddb.h> 69#ifdef INET6 70#include <netinet6/in6_var.h> 71#endif /* INET6 */ 72#endif /* DDB */ 73 74#include <security/mac/mac_framework.h> 75 76#define DEFAULT_HOSTUUID "00000000-0000-0000-0000-000000000000" 77 78MALLOC_DEFINE(M_PRISON, "prison", "Prison structures"); 79 80/* Keep struct prison prison0 and some code in kern_jail_set() readable. */ 81#ifdef INET 82#ifdef INET6 83#define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL 84#else 85#define _PR_IP_SADDRSEL PR_IP4_SADDRSEL 86#endif 87#else /* !INET */ 88#ifdef INET6 89#define _PR_IP_SADDRSEL PR_IP6_SADDRSEL 90#else 91#define _PR_IP_SADDRSEL 0 92#endif 93#endif 94 95/* prison0 describes what is "real" about the system. */ 96struct prison prison0 = { 97 .pr_id = 0, 98 .pr_name = "0", 99 .pr_ref = 1, 100 .pr_uref = 1, 101 .pr_path = "/", 102 .pr_securelevel = -1, 103 .pr_childmax = JAIL_MAX, 104 .pr_hostuuid = DEFAULT_HOSTUUID, 105 .pr_children = LIST_HEAD_INITIALIZER(prison0.pr_children), 106#ifdef VIMAGE 107 .pr_flags = PR_HOST|PR_VNET|_PR_IP_SADDRSEL, 108#else 109 .pr_flags = PR_HOST|_PR_IP_SADDRSEL, 110#endif 111 .pr_allow = PR_ALLOW_ALL, 112}; 113MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF); 114 115/* allprison and lastprid are protected by allprison_lock. */ 116struct sx allprison_lock; 117SX_SYSINIT(allprison_lock, &allprison_lock, "allprison"); 118struct prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison); 119int lastprid = 0; 120 121static int do_jail_attach(struct thread *td, struct prison *pr); 122static void prison_complete(void *context, int pending); 123static void prison_deref(struct prison *pr, int flags); 124static char *prison_path(struct prison *pr1, struct prison *pr2); 125static void prison_remove_one(struct prison *pr); 126#ifdef INET 127static int _prison_check_ip4(struct prison *pr, struct in_addr *ia); 128static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4); 129#endif 130#ifdef INET6 131static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6); 132static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6); 133#endif 134 135/* Flags for prison_deref */ 136#define PD_DEREF 0x01 137#define PD_DEUREF 0x02 138#define PD_LOCKED 0x04 139#define PD_LIST_SLOCKED 0x08 140#define PD_LIST_XLOCKED 0x10 141 142/* 143 * Parameter names corresponding to PR_* flag values 144 */ 145static char *pr_flag_names[] = { 146 [0] = "persist", 147#ifdef INET 148 [7] = "ip4.saddrsel", 149#endif 150#ifdef INET6 151 [8] = "ip6.saddrsel", 152#endif 153}; 154 155static char *pr_flag_nonames[] = { 156 [0] = "nopersist", 157#ifdef INET 158 [7] = "ip4.nosaddrsel", 159#endif 160#ifdef INET6 161 [8] = "ip6.nosaddrsel", 162#endif 163}; 164 165struct jailsys_flags { 166 const char *name; 167 unsigned disable; 168 unsigned new; 169} pr_flag_jailsys[] = { 170 { "host", 0, PR_HOST }, 171#ifdef VIMAGE 172 { "vnet", 0, PR_VNET }, 173#endif 174#ifdef INET 175 { "ip4", PR_IP4_USER | PR_IP4_DISABLE, PR_IP4_USER }, 176#endif 177#ifdef INET6 178 { "ip6", PR_IP6_USER | PR_IP6_DISABLE, PR_IP6_USER }, 179#endif 180}; 181 182static char *pr_allow_names[] = { 183 "allow.set_hostname", 184 "allow.sysvipc", 185 "allow.raw_sockets", 186 "allow.chflags", 187 "allow.mount", 188 "allow.quotas", 189 "allow.socket_af", 190}; 191 192static char *pr_allow_nonames[] = { 193 "allow.noset_hostname", 194 "allow.nosysvipc", 195 "allow.noraw_sockets", 196 "allow.nochflags", 197 "allow.nomount", 198 "allow.noquotas", 199 "allow.nosocket_af", 200}; 201 202#define JAIL_DEFAULT_ALLOW PR_ALLOW_SET_HOSTNAME 203#define JAIL_DEFAULT_ENFORCE_STATFS 2 204static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW; 205static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 206#if defined(INET) || defined(INET6) 207static unsigned jail_max_af_ips = 255; 208#endif 209 210#ifdef INET 211static int 212qcmp_v4(const void *ip1, const void *ip2) 213{ 214 in_addr_t iaa, iab; 215 216 /* 217 * We need to compare in HBO here to get the list sorted as expected 218 * by the result of the code. Sorting NBO addresses gives you 219 * interesting results. If you do not understand, do not try. 220 */ 221 iaa = ntohl(((const struct in_addr *)ip1)->s_addr); 222 iab = ntohl(((const struct in_addr *)ip2)->s_addr); 223 224 /* 225 * Do not simply return the difference of the two numbers, the int is 226 * not wide enough. 227 */ 228 if (iaa > iab) 229 return (1); 230 else if (iaa < iab) 231 return (-1); 232 else 233 return (0); 234} 235#endif 236 237#ifdef INET6 238static int 239qcmp_v6(const void *ip1, const void *ip2) 240{ 241 const struct in6_addr *ia6a, *ia6b; 242 int i, rc; 243 244 ia6a = (const struct in6_addr *)ip1; 245 ia6b = (const struct in6_addr *)ip2; 246 247 rc = 0; 248 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) { 249 if (ia6a->s6_addr[i] > ia6b->s6_addr[i]) 250 rc = 1; 251 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i]) 252 rc = -1; 253 } 254 return (rc); 255} 256#endif 257 258/* 259 * struct jail_args { 260 * struct jail *jail; 261 * }; 262 */ 263int 264jail(struct thread *td, struct jail_args *uap) 265{ 266 uint32_t version; 267 int error; 268 struct jail j; 269 270 error = copyin(uap->jail, &version, sizeof(uint32_t)); 271 if (error) 272 return (error); 273 274 switch (version) { 275 case 0: 276 { 277 struct jail_v0 j0; 278 279 /* FreeBSD single IPv4 jails. */ 280 bzero(&j, sizeof(struct jail)); 281 error = copyin(uap->jail, &j0, sizeof(struct jail_v0)); 282 if (error) 283 return (error); 284 j.version = j0.version; 285 j.path = j0.path; 286 j.hostname = j0.hostname; 287 j.ip4s = j0.ip_number; 288 break; 289 } 290 291 case 1: 292 /* 293 * Version 1 was used by multi-IPv4 jail implementations 294 * that never made it into the official kernel. 295 */ 296 return (EINVAL); 297 298 case 2: /* JAIL_API_VERSION */ 299 /* FreeBSD multi-IPv4/IPv6,noIP jails. */ 300 error = copyin(uap->jail, &j, sizeof(struct jail)); 301 if (error) 302 return (error); 303 break; 304 305 default: 306 /* Sci-Fi jails are not supported, sorry. */ 307 return (EINVAL); 308 } 309 return (kern_jail(td, &j)); 310} 311 312int 313kern_jail(struct thread *td, struct jail *j) 314{ 315 struct iovec optiov[2 * (4 316 + sizeof(pr_allow_names) / sizeof(pr_allow_names[0]) 317#ifdef INET 318 + 1 319#endif 320#ifdef INET6 321 + 1 322#endif 323 )]; 324 struct uio opt; 325 char *u_path, *u_hostname, *u_name; 326#ifdef INET 327 uint32_t ip4s; 328 struct in_addr *u_ip4; 329#endif 330#ifdef INET6 331 struct in6_addr *u_ip6; 332#endif 333 size_t tmplen; 334 int error, enforce_statfs, fi; 335 336 bzero(&optiov, sizeof(optiov)); 337 opt.uio_iov = optiov; 338 opt.uio_iovcnt = 0; 339 opt.uio_offset = -1; 340 opt.uio_resid = -1; 341 opt.uio_segflg = UIO_SYSSPACE; 342 opt.uio_rw = UIO_READ; 343 opt.uio_td = td; 344 345 /* Set permissions for top-level jails from sysctls. */ 346 if (!jailed(td->td_ucred)) { 347 for (fi = 0; fi < sizeof(pr_allow_names) / 348 sizeof(pr_allow_names[0]); fi++) { 349 optiov[opt.uio_iovcnt].iov_base = 350 (jail_default_allow & (1 << fi)) 351 ? pr_allow_names[fi] : pr_allow_nonames[fi]; 352 optiov[opt.uio_iovcnt].iov_len = 353 strlen(optiov[opt.uio_iovcnt].iov_base) + 1; 354 opt.uio_iovcnt += 2; 355 } 356 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs"; 357 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs"); 358 opt.uio_iovcnt++; 359 enforce_statfs = jail_default_enforce_statfs; 360 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs; 361 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs); 362 opt.uio_iovcnt++; 363 } 364 365 tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN; 366#ifdef INET 367 ip4s = (j->version == 0) ? 1 : j->ip4s; 368 if (ip4s > jail_max_af_ips) 369 return (EINVAL); 370 tmplen += ip4s * sizeof(struct in_addr); 371#else 372 if (j->ip4s > 0) 373 return (EINVAL); 374#endif 375#ifdef INET6 376 if (j->ip6s > jail_max_af_ips) 377 return (EINVAL); 378 tmplen += j->ip6s * sizeof(struct in6_addr); 379#else 380 if (j->ip6s > 0) 381 return (EINVAL); 382#endif 383 u_path = malloc(tmplen, M_TEMP, M_WAITOK); 384 u_hostname = u_path + MAXPATHLEN; 385 u_name = u_hostname + MAXHOSTNAMELEN; 386#ifdef INET 387 u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN); 388#endif 389#ifdef INET6 390#ifdef INET 391 u_ip6 = (struct in6_addr *)(u_ip4 + ip4s); 392#else 393 u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN); 394#endif 395#endif 396 optiov[opt.uio_iovcnt].iov_base = "path"; 397 optiov[opt.uio_iovcnt].iov_len = sizeof("path"); 398 opt.uio_iovcnt++; 399 optiov[opt.uio_iovcnt].iov_base = u_path; 400 error = copyinstr(j->path, u_path, MAXPATHLEN, 401 &optiov[opt.uio_iovcnt].iov_len); 402 if (error) { 403 free(u_path, M_TEMP); 404 return (error); 405 } 406 opt.uio_iovcnt++; 407 optiov[opt.uio_iovcnt].iov_base = "host.hostname"; 408 optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname"); 409 opt.uio_iovcnt++; 410 optiov[opt.uio_iovcnt].iov_base = u_hostname; 411 error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN, 412 &optiov[opt.uio_iovcnt].iov_len); 413 if (error) { 414 free(u_path, M_TEMP); 415 return (error); 416 } 417 opt.uio_iovcnt++; 418 if (j->jailname != NULL) { 419 optiov[opt.uio_iovcnt].iov_base = "name"; 420 optiov[opt.uio_iovcnt].iov_len = sizeof("name"); 421 opt.uio_iovcnt++; 422 optiov[opt.uio_iovcnt].iov_base = u_name; 423 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN, 424 &optiov[opt.uio_iovcnt].iov_len); 425 if (error) { 426 free(u_path, M_TEMP); 427 return (error); 428 } 429 opt.uio_iovcnt++; 430 } 431#ifdef INET 432 optiov[opt.uio_iovcnt].iov_base = "ip4.addr"; 433 optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr"); 434 opt.uio_iovcnt++; 435 optiov[opt.uio_iovcnt].iov_base = u_ip4; 436 optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr); 437 if (j->version == 0) 438 u_ip4->s_addr = j->ip4s; 439 else { 440 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len); 441 if (error) { 442 free(u_path, M_TEMP); 443 return (error); 444 } 445 } 446 opt.uio_iovcnt++; 447#endif 448#ifdef INET6 449 optiov[opt.uio_iovcnt].iov_base = "ip6.addr"; 450 optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr"); 451 opt.uio_iovcnt++; 452 optiov[opt.uio_iovcnt].iov_base = u_ip6; 453 optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr); 454 error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len); 455 if (error) { 456 free(u_path, M_TEMP); 457 return (error); 458 } 459 opt.uio_iovcnt++; 460#endif 461 KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]), 462 ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt)); 463 error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH); 464 free(u_path, M_TEMP); 465 return (error); 466} 467 468 469/* 470 * struct jail_set_args { 471 * struct iovec *iovp; 472 * unsigned int iovcnt; 473 * int flags; 474 * }; 475 */ 476int 477jail_set(struct thread *td, struct jail_set_args *uap) 478{ 479 struct uio *auio; 480 int error; 481 482 /* Check that we have an even number of iovecs. */ 483 if (uap->iovcnt & 1) 484 return (EINVAL); 485 486 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 487 if (error) 488 return (error); 489 error = kern_jail_set(td, auio, uap->flags); 490 free(auio, M_IOV); 491 return (error); 492} 493 494int 495kern_jail_set(struct thread *td, struct uio *optuio, int flags) 496{ 497 struct nameidata nd; 498#ifdef INET 499 struct in_addr *ip4; 500#endif 501#ifdef INET6 502 struct in6_addr *ip6; 503#endif 504 struct vfsopt *opt; 505 struct vfsoptlist *opts; 506 struct prison *pr, *deadpr, *mypr, *ppr, *tpr; 507 struct vnode *root; 508 char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid; 509#if defined(INET) || defined(INET6) 510 struct prison *tppr; 511 void *op; 512#endif 513 unsigned long hid; 514 size_t namelen, onamelen; 515 int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos; 516 int gotchildmax, gotenforce, gothid, gotslevel; 517 int fi, jid, jsys, len, level; 518 int childmax, slevel, vfslocked; 519#if defined(INET) || defined(INET6) 520 int ii, ij; 521#endif 522#ifdef INET 523 int ip4s, redo_ip4; 524#endif 525#ifdef INET6 526 int ip6s, redo_ip6; 527#endif 528 unsigned pr_flags, ch_flags; 529 unsigned pr_allow, ch_allow, tallow; 530 char numbuf[12]; 531 532 error = priv_check(td, PRIV_JAIL_SET); 533 if (!error && (flags & JAIL_ATTACH)) 534 error = priv_check(td, PRIV_JAIL_ATTACH); 535 if (error) 536 return (error); 537 mypr = ppr = td->td_ucred->cr_prison; 538 if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) 539 return (EPERM); 540 if (flags & ~JAIL_SET_MASK) 541 return (EINVAL); 542 543 /* 544 * Check all the parameters before committing to anything. Not all 545 * errors can be caught early, but we may as well try. Also, this 546 * takes care of some expensive stuff (path lookup) before getting 547 * the allprison lock. 548 * 549 * XXX Jails are not filesystems, and jail parameters are not mount 550 * options. But it makes more sense to re-use the vfsopt code 551 * than duplicate it under a different name. 552 */ 553 error = vfs_buildopts(optuio, &opts); 554 if (error) 555 return (error); 556#ifdef INET 557 ip4 = NULL; 558#endif 559#ifdef INET6 560 ip6 = NULL; 561#endif 562 563 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 564 if (error == ENOENT) 565 jid = 0; 566 else if (error != 0) 567 goto done_free; 568 569 error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel)); 570 if (error == ENOENT) 571 gotslevel = 0; 572 else if (error != 0) 573 goto done_free; 574 else 575 gotslevel = 1; 576 577 error = 578 vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax)); 579 if (error == ENOENT) 580 gotchildmax = 0; 581 else if (error != 0) 582 goto done_free; 583 else 584 gotchildmax = 1; 585 586 error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce)); 587 gotenforce = (error == 0); 588 if (gotenforce) { 589 if (enforce < 0 || enforce > 2) 590 return (EINVAL); 591 } else if (error != ENOENT) 592 goto done_free; 593 594 pr_flags = ch_flags = 0; 595 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 596 fi++) { 597 if (pr_flag_names[fi] == NULL) 598 continue; 599 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi); 600 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi); 601 } 602 ch_flags |= pr_flags; 603 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 604 fi++) { 605 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys, 606 sizeof(jsys)); 607 if (error == ENOENT) 608 continue; 609 if (error != 0) 610 goto done_free; 611 switch (jsys) { 612 case JAIL_SYS_DISABLE: 613 if (!pr_flag_jailsys[fi].disable) { 614 error = EINVAL; 615 goto done_free; 616 } 617 pr_flags |= pr_flag_jailsys[fi].disable; 618 break; 619 case JAIL_SYS_NEW: 620 pr_flags |= pr_flag_jailsys[fi].new; 621 break; 622 case JAIL_SYS_INHERIT: 623 break; 624 default: 625 error = EINVAL; 626 goto done_free; 627 } 628 ch_flags |= 629 pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable; 630 } 631 if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE 632 && !(pr_flags & PR_PERSIST)) { 633 error = EINVAL; 634 vfs_opterror(opts, "new jail must persist or attach"); 635 goto done_errmsg; 636 } 637#ifdef VIMAGE 638 if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) { 639 error = EINVAL; 640 vfs_opterror(opts, "vnet cannot be changed after creation"); 641 goto done_errmsg; 642 } 643#endif 644#ifdef INET 645 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) { 646 error = EINVAL; 647 vfs_opterror(opts, "ip4 cannot be changed after creation"); 648 goto done_errmsg; 649 } 650#endif 651#ifdef INET6 652 if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) { 653 error = EINVAL; 654 vfs_opterror(opts, "ip6 cannot be changed after creation"); 655 goto done_errmsg; 656 } 657#endif 658 659 pr_allow = ch_allow = 0; 660 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 661 fi++) { 662 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi); 663 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi); 664 } 665 ch_allow |= pr_allow; 666 667 error = vfs_getopt(opts, "name", (void **)&name, &len); 668 if (error == ENOENT) 669 name = NULL; 670 else if (error != 0) 671 goto done_free; 672 else { 673 if (len == 0 || name[len - 1] != '\0') { 674 error = EINVAL; 675 goto done_free; 676 } 677 if (len > MAXHOSTNAMELEN) { 678 error = ENAMETOOLONG; 679 goto done_free; 680 } 681 } 682 683 error = vfs_getopt(opts, "host.hostname", (void **)&host, &len); 684 if (error == ENOENT) 685 host = NULL; 686 else if (error != 0) 687 goto done_free; 688 else { 689 ch_flags |= PR_HOST; 690 pr_flags |= PR_HOST; 691 if (len == 0 || host[len - 1] != '\0') { 692 error = EINVAL; 693 goto done_free; 694 } 695 if (len > MAXHOSTNAMELEN) { 696 error = ENAMETOOLONG; 697 goto done_free; 698 } 699 } 700 701 error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len); 702 if (error == ENOENT) 703 domain = NULL; 704 else if (error != 0) 705 goto done_free; 706 else { 707 ch_flags |= PR_HOST; 708 pr_flags |= PR_HOST; 709 if (len == 0 || domain[len - 1] != '\0') { 710 error = EINVAL; 711 goto done_free; 712 } 713 if (len > MAXHOSTNAMELEN) { 714 error = ENAMETOOLONG; 715 goto done_free; 716 } 717 } 718 719 error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len); 720 if (error == ENOENT) 721 uuid = NULL; 722 else if (error != 0) 723 goto done_free; 724 else { 725 ch_flags |= PR_HOST; 726 pr_flags |= PR_HOST; 727 if (len == 0 || uuid[len - 1] != '\0') { 728 error = EINVAL; 729 goto done_free; 730 } 731 if (len > HOSTUUIDLEN) { 732 error = ENAMETOOLONG; 733 goto done_free; 734 } 735 } 736 737#ifdef COMPAT_FREEBSD32 738 if (td->td_proc->p_sysent->sv_flags & SV_ILP32) { 739 uint32_t hid32; 740 741 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32)); 742 hid = hid32; 743 } else 744#endif 745 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid)); 746 if (error == ENOENT) 747 gothid = 0; 748 else if (error != 0) 749 goto done_free; 750 else { 751 gothid = 1; 752 ch_flags |= PR_HOST; 753 pr_flags |= PR_HOST; 754 } 755 756#ifdef INET 757 error = vfs_getopt(opts, "ip4.addr", &op, &ip4s); 758 if (error == ENOENT) 759 ip4s = (pr_flags & PR_IP4_DISABLE) ? 0 : -1; 760 else if (error != 0) 761 goto done_free; 762 else if (ip4s & (sizeof(*ip4) - 1)) { 763 error = EINVAL; 764 goto done_free; 765 } else { 766 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE; 767 if (ip4s == 0) 768 pr_flags |= PR_IP4_USER | PR_IP4_DISABLE; 769 else { 770 pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER; 771 ip4s /= sizeof(*ip4); 772 if (ip4s > jail_max_af_ips) { 773 error = EINVAL; 774 vfs_opterror(opts, "too many IPv4 addresses"); 775 goto done_errmsg; 776 } 777 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 778 bcopy(op, ip4, ip4s * sizeof(*ip4)); 779 /* 780 * IP addresses are all sorted but ip[0] to preserve 781 * the primary IP address as given from userland. 782 * This special IP is used for unbound outgoing 783 * connections as well for "loopback" traffic in case 784 * source address selection cannot find any more fitting 785 * address to connect from. 786 */ 787 if (ip4s > 1) 788 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4); 789 /* 790 * Check for duplicate addresses and do some simple 791 * zero and broadcast checks. If users give other bogus 792 * addresses it is their problem. 793 * 794 * We do not have to care about byte order for these 795 * checks so we will do them in NBO. 796 */ 797 for (ii = 0; ii < ip4s; ii++) { 798 if (ip4[ii].s_addr == INADDR_ANY || 799 ip4[ii].s_addr == INADDR_BROADCAST) { 800 error = EINVAL; 801 goto done_free; 802 } 803 if ((ii+1) < ip4s && 804 (ip4[0].s_addr == ip4[ii+1].s_addr || 805 ip4[ii].s_addr == ip4[ii+1].s_addr)) { 806 error = EINVAL; 807 goto done_free; 808 } 809 } 810 } 811 } 812#endif 813 814#ifdef INET6 815 error = vfs_getopt(opts, "ip6.addr", &op, &ip6s); 816 if (error == ENOENT) 817 ip6s = (pr_flags & PR_IP6_DISABLE) ? 0 : -1; 818 else if (error != 0) 819 goto done_free; 820 else if (ip6s & (sizeof(*ip6) - 1)) { 821 error = EINVAL; 822 goto done_free; 823 } else { 824 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE; 825 if (ip6s == 0) 826 pr_flags |= PR_IP6_USER | PR_IP6_DISABLE; 827 else { 828 pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER; 829 ip6s /= sizeof(*ip6); 830 if (ip6s > jail_max_af_ips) { 831 error = EINVAL; 832 vfs_opterror(opts, "too many IPv6 addresses"); 833 goto done_errmsg; 834 } 835 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 836 bcopy(op, ip6, ip6s * sizeof(*ip6)); 837 if (ip6s > 1) 838 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6); 839 for (ii = 0; ii < ip6s; ii++) { 840 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) { 841 error = EINVAL; 842 goto done_free; 843 } 844 if ((ii+1) < ip6s && 845 (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) || 846 IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1]))) 847 { 848 error = EINVAL; 849 goto done_free; 850 } 851 } 852 } 853 } 854#endif 855 856#if defined(VIMAGE) && (defined(INET) || defined(INET6)) 857 if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 858 error = EINVAL; 859 vfs_opterror(opts, 860 "vnet jails cannot have IP address restrictions"); 861 goto done_errmsg; 862 } 863#endif 864 865 root = NULL; 866 error = vfs_getopt(opts, "path", (void **)&path, &len); 867 if (error == ENOENT) 868 path = NULL; 869 else if (error != 0) 870 goto done_free; 871 else { 872 if (flags & JAIL_UPDATE) { 873 error = EINVAL; 874 vfs_opterror(opts, 875 "path cannot be changed after creation"); 876 goto done_errmsg; 877 } 878 if (len == 0 || path[len - 1] != '\0') { 879 error = EINVAL; 880 goto done_free; 881 } 882 if (len < 2 || (len == 2 && path[0] == '/')) 883 path = NULL; 884 else { 885 /* Leave room for a real-root full pathname. */ 886 if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/") 887 ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) { 888 error = ENAMETOOLONG; 889 goto done_free; 890 } 891 NDINIT(&nd, LOOKUP, MPSAFE | FOLLOW, UIO_SYSSPACE, 892 path, td); 893 error = namei(&nd); 894 if (error) 895 goto done_free; 896 vfslocked = NDHASGIANT(&nd); 897 root = nd.ni_vp; 898 NDFREE(&nd, NDF_ONLY_PNBUF); 899 if (root->v_type != VDIR) { 900 error = ENOTDIR; 901 vrele(root); 902 VFS_UNLOCK_GIANT(vfslocked); 903 goto done_free; 904 } 905 VFS_UNLOCK_GIANT(vfslocked); 906 } 907 } 908 909 /* 910 * Grab the allprison lock before letting modules check their 911 * parameters. Once we have it, do not let go so we'll have a 912 * consistent view of the OSD list. 913 */ 914 sx_xlock(&allprison_lock); 915 error = osd_jail_call(NULL, PR_METHOD_CHECK, opts); 916 if (error) 917 goto done_unlock_list; 918 919 /* By now, all parameters should have been noted. */ 920 TAILQ_FOREACH(opt, opts, link) { 921 if (!opt->seen && strcmp(opt->name, "errmsg")) { 922 error = EINVAL; 923 vfs_opterror(opts, "unknown parameter: %s", opt->name); 924 goto done_unlock_list; 925 } 926 } 927 928 /* 929 * See if we are creating a new record or updating an existing one. 930 * This abuses the file error codes ENOENT and EEXIST. 931 */ 932 cuflags = flags & (JAIL_CREATE | JAIL_UPDATE); 933 if (!cuflags) { 934 error = EINVAL; 935 vfs_opterror(opts, "no valid operation (create or update)"); 936 goto done_unlock_list; 937 } 938 pr = NULL; 939 namelc = NULL; 940 if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) { 941 namelc = strrchr(name, '.'); 942 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10); 943 if (*p != '\0') 944 jid = 0; 945 } 946 if (jid != 0) { 947 /* 948 * See if a requested jid already exists. There is an 949 * information leak here if the jid exists but is not within 950 * the caller's jail hierarchy. Jail creators will get EEXIST 951 * even though they cannot see the jail, and CREATE | UPDATE 952 * will return ENOENT which is not normally a valid error. 953 */ 954 if (jid < 0) { 955 error = EINVAL; 956 vfs_opterror(opts, "negative jid"); 957 goto done_unlock_list; 958 } 959 pr = prison_find(jid); 960 if (pr != NULL) { 961 ppr = pr->pr_parent; 962 /* Create: jid must not exist. */ 963 if (cuflags == JAIL_CREATE) { 964 mtx_unlock(&pr->pr_mtx); 965 error = EEXIST; 966 vfs_opterror(opts, "jail %d already exists", 967 jid); 968 goto done_unlock_list; 969 } 970 if (!prison_ischild(mypr, pr)) { 971 mtx_unlock(&pr->pr_mtx); 972 pr = NULL; 973 } else if (pr->pr_uref == 0) { 974 if (!(flags & JAIL_DYING)) { 975 mtx_unlock(&pr->pr_mtx); 976 error = ENOENT; 977 vfs_opterror(opts, "jail %d is dying", 978 jid); 979 goto done_unlock_list; 980 } else if ((flags & JAIL_ATTACH) || 981 (pr_flags & PR_PERSIST)) { 982 /* 983 * A dying jail might be resurrected 984 * (via attach or persist), but first 985 * it must determine if another jail 986 * has claimed its name. Accomplish 987 * this by implicitly re-setting the 988 * name. 989 */ 990 if (name == NULL) 991 name = prison_name(mypr, pr); 992 } 993 } 994 } 995 if (pr == NULL) { 996 /* Update: jid must exist. */ 997 if (cuflags == JAIL_UPDATE) { 998 error = ENOENT; 999 vfs_opterror(opts, "jail %d not found", jid); 1000 goto done_unlock_list; 1001 } 1002 } 1003 } 1004 /* 1005 * If the caller provided a name, look for a jail by that name. 1006 * This has different semantics for creates and updates keyed by jid 1007 * (where the name must not already exist in a different jail), 1008 * and updates keyed by the name itself (where the name must exist 1009 * because that is the jail being updated). 1010 */ 1011 if (name != NULL) { 1012 namelc = strrchr(name, '.'); 1013 if (namelc == NULL) 1014 namelc = name; 1015 else { 1016 /* 1017 * This is a hierarchical name. Split it into the 1018 * parent and child names, and make sure the parent 1019 * exists or matches an already found jail. 1020 */ 1021 *namelc = '\0'; 1022 if (pr != NULL) { 1023 if (strncmp(name, ppr->pr_name, namelc - name) 1024 || ppr->pr_name[namelc - name] != '\0') { 1025 mtx_unlock(&pr->pr_mtx); 1026 error = EINVAL; 1027 vfs_opterror(opts, 1028 "cannot change jail's parent"); 1029 goto done_unlock_list; 1030 } 1031 } else { 1032 ppr = prison_find_name(mypr, name); 1033 if (ppr == NULL) { 1034 error = ENOENT; 1035 vfs_opterror(opts, 1036 "jail \"%s\" not found", name); 1037 goto done_unlock_list; 1038 } 1039 mtx_unlock(&ppr->pr_mtx); 1040 } 1041 name = ++namelc; 1042 } 1043 if (name[0] != '\0') { 1044 namelen = 1045 (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1; 1046 name_again: 1047 deadpr = NULL; 1048 FOREACH_PRISON_CHILD(ppr, tpr) { 1049 if (tpr != pr && tpr->pr_ref > 0 && 1050 !strcmp(tpr->pr_name + namelen, name)) { 1051 if (pr == NULL && 1052 cuflags != JAIL_CREATE) { 1053 mtx_lock(&tpr->pr_mtx); 1054 if (tpr->pr_ref > 0) { 1055 /* 1056 * Use this jail 1057 * for updates. 1058 */ 1059 if (tpr->pr_uref > 0) { 1060 pr = tpr; 1061 break; 1062 } 1063 deadpr = tpr; 1064 } 1065 mtx_unlock(&tpr->pr_mtx); 1066 } else if (tpr->pr_uref > 0) { 1067 /* 1068 * Create, or update(jid): 1069 * name must not exist in an 1070 * active sibling jail. 1071 */ 1072 error = EEXIST; 1073 if (pr != NULL) 1074 mtx_unlock(&pr->pr_mtx); 1075 vfs_opterror(opts, 1076 "jail \"%s\" already exists", 1077 name); 1078 goto done_unlock_list; 1079 } 1080 } 1081 } 1082 /* If no active jail is found, use a dying one. */ 1083 if (deadpr != NULL && pr == NULL) { 1084 if (flags & JAIL_DYING) { 1085 mtx_lock(&deadpr->pr_mtx); 1086 if (deadpr->pr_ref == 0) { 1087 mtx_unlock(&deadpr->pr_mtx); 1088 goto name_again; 1089 } 1090 pr = deadpr; 1091 } else if (cuflags == JAIL_UPDATE) { 1092 error = ENOENT; 1093 vfs_opterror(opts, 1094 "jail \"%s\" is dying", name); 1095 goto done_unlock_list; 1096 } 1097 } 1098 /* Update: name must exist if no jid. */ 1099 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1100 error = ENOENT; 1101 vfs_opterror(opts, "jail \"%s\" not found", 1102 name); 1103 goto done_unlock_list; 1104 } 1105 } 1106 } 1107 /* Update: must provide a jid or name. */ 1108 else if (cuflags == JAIL_UPDATE && pr == NULL) { 1109 error = ENOENT; 1110 vfs_opterror(opts, "update specified no jail"); 1111 goto done_unlock_list; 1112 } 1113 1114 /* If there's no prison to update, create a new one and link it in. */ 1115 if (pr == NULL) { 1116 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent) 1117 if (tpr->pr_childcount >= tpr->pr_childmax) { 1118 error = EPERM; 1119 vfs_opterror(opts, "prison limit exceeded"); 1120 goto done_unlock_list; 1121 } 1122 created = 1; 1123 mtx_lock(&ppr->pr_mtx); 1124 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) { 1125 mtx_unlock(&ppr->pr_mtx); 1126 error = ENOENT; 1127 vfs_opterror(opts, "parent jail went away!"); 1128 goto done_unlock_list; 1129 } 1130 ppr->pr_ref++; 1131 ppr->pr_uref++; 1132 mtx_unlock(&ppr->pr_mtx); 1133 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO); 1134 if (jid == 0) { 1135 /* Find the next free jid. */ 1136 jid = lastprid + 1; 1137 findnext: 1138 if (jid == JAIL_MAX) 1139 jid = 1; 1140 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1141 if (tpr->pr_id < jid) 1142 continue; 1143 if (tpr->pr_id > jid || tpr->pr_ref == 0) { 1144 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1145 break; 1146 } 1147 if (jid == lastprid) { 1148 error = EAGAIN; 1149 vfs_opterror(opts, 1150 "no available jail IDs"); 1151 free(pr, M_PRISON); 1152 prison_deref(ppr, PD_DEREF | 1153 PD_DEUREF | PD_LIST_XLOCKED); 1154 goto done_releroot; 1155 } 1156 jid++; 1157 goto findnext; 1158 } 1159 lastprid = jid; 1160 } else { 1161 /* 1162 * The jail already has a jid (that did not yet exist), 1163 * so just find where to insert it. 1164 */ 1165 TAILQ_FOREACH(tpr, &allprison, pr_list) 1166 if (tpr->pr_id >= jid) { 1167 TAILQ_INSERT_BEFORE(tpr, pr, pr_list); 1168 break; 1169 } 1170 } 1171 if (tpr == NULL) 1172 TAILQ_INSERT_TAIL(&allprison, pr, pr_list); 1173 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling); 1174 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 1175 tpr->pr_childcount++; 1176 1177 pr->pr_parent = ppr; 1178 pr->pr_id = jid; 1179 1180 /* Set some default values, and inherit some from the parent. */ 1181 if (name == NULL) 1182 name = ""; 1183 if (path == NULL) { 1184 path = "/"; 1185 root = mypr->pr_root; 1186 vref(root); 1187 } 1188 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN); 1189 pr->pr_flags |= PR_HOST; 1190#if defined(INET) || defined(INET6) 1191#ifdef VIMAGE 1192 if (!(pr_flags & PR_VNET)) 1193#endif 1194 { 1195#ifdef INET 1196 if (!(ch_flags & PR_IP4_USER)) 1197 pr->pr_flags |= 1198 PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE; 1199 else if (!(pr_flags & PR_IP4_USER)) { 1200 pr->pr_flags |= ppr->pr_flags & PR_IP4; 1201 if (ppr->pr_ip4 != NULL) { 1202 pr->pr_ip4s = ppr->pr_ip4s; 1203 pr->pr_ip4 = malloc(pr->pr_ip4s * 1204 sizeof(struct in_addr), M_PRISON, 1205 M_WAITOK); 1206 bcopy(ppr->pr_ip4, pr->pr_ip4, 1207 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1208 } 1209 } 1210#endif 1211#ifdef INET6 1212 if (!(ch_flags & PR_IP6_USER)) 1213 pr->pr_flags |= 1214 PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE; 1215 else if (!(pr_flags & PR_IP6_USER)) { 1216 pr->pr_flags |= ppr->pr_flags & PR_IP6; 1217 if (ppr->pr_ip6 != NULL) { 1218 pr->pr_ip6s = ppr->pr_ip6s; 1219 pr->pr_ip6 = malloc(pr->pr_ip6s * 1220 sizeof(struct in6_addr), M_PRISON, 1221 M_WAITOK); 1222 bcopy(ppr->pr_ip6, pr->pr_ip6, 1223 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1224 } 1225 } 1226#endif 1227 } 1228#endif 1229 /* Source address selection is always on by default. */ 1230 pr->pr_flags |= _PR_IP_SADDRSEL; 1231 1232 pr->pr_securelevel = ppr->pr_securelevel; 1233 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow; 1234 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS; 1235 1236 LIST_INIT(&pr->pr_children); 1237 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK); 1238 1239#ifdef VIMAGE 1240 /* Allocate a new vnet if specified. */ 1241 pr->pr_vnet = (pr_flags & PR_VNET) 1242 ? vnet_alloc() : ppr->pr_vnet; 1243#endif 1244 /* 1245 * Allocate a dedicated cpuset for each jail. 1246 * Unlike other initial settings, this may return an erorr. 1247 */ 1248 error = cpuset_create_root(ppr, &pr->pr_cpuset); 1249 if (error) { 1250 prison_deref(pr, PD_LIST_XLOCKED); 1251 goto done_releroot; 1252 } 1253 1254 mtx_lock(&pr->pr_mtx); 1255 /* 1256 * New prisons do not yet have a reference, because we do not 1257 * want other to see the incomplete prison once the 1258 * allprison_lock is downgraded. 1259 */ 1260 } else { 1261 created = 0; 1262 /* 1263 * Grab a reference for existing prisons, to ensure they 1264 * continue to exist for the duration of the call. 1265 */ 1266 pr->pr_ref++; 1267#if defined(VIMAGE) && (defined(INET) || defined(INET6)) 1268 if ((pr->pr_flags & PR_VNET) && 1269 (ch_flags & (PR_IP4_USER | PR_IP6_USER))) { 1270 error = EINVAL; 1271 vfs_opterror(opts, 1272 "vnet jails cannot have IP address restrictions"); 1273 goto done_deref_locked; 1274 } 1275#endif 1276#ifdef INET 1277 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1278 error = EINVAL; 1279 vfs_opterror(opts, 1280 "ip4 cannot be changed after creation"); 1281 goto done_deref_locked; 1282 } 1283#endif 1284#ifdef INET6 1285 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) { 1286 error = EINVAL; 1287 vfs_opterror(opts, 1288 "ip6 cannot be changed after creation"); 1289 goto done_deref_locked; 1290 } 1291#endif 1292 } 1293 1294 /* Do final error checking before setting anything. */ 1295 if (gotslevel) { 1296 if (slevel < ppr->pr_securelevel) { 1297 error = EPERM; 1298 goto done_deref_locked; 1299 } 1300 } 1301 if (gotchildmax) { 1302 if (childmax >= ppr->pr_childmax) { 1303 error = EPERM; 1304 goto done_deref_locked; 1305 } 1306 } 1307 if (gotenforce) { 1308 if (enforce < ppr->pr_enforce_statfs) { 1309 error = EPERM; 1310 goto done_deref_locked; 1311 } 1312 } 1313#ifdef INET 1314 if (ip4s > 0) { 1315 if (ppr->pr_flags & PR_IP4) { 1316 /* 1317 * Make sure the new set of IP addresses is a 1318 * subset of the parent's list. Don't worry 1319 * about the parent being unlocked, as any 1320 * setting is done with allprison_lock held. 1321 */ 1322 for (ij = 0; ij < ppr->pr_ip4s; ij++) 1323 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 1324 break; 1325 if (ij == ppr->pr_ip4s) { 1326 error = EPERM; 1327 goto done_deref_locked; 1328 } 1329 if (ip4s > 1) { 1330 for (ii = ij = 1; ii < ip4s; ii++) { 1331 if (ip4[ii].s_addr == 1332 ppr->pr_ip4[0].s_addr) 1333 continue; 1334 for (; ij < ppr->pr_ip4s; ij++) 1335 if (ip4[ii].s_addr == 1336 ppr->pr_ip4[ij].s_addr) 1337 break; 1338 if (ij == ppr->pr_ip4s) 1339 break; 1340 } 1341 if (ij == ppr->pr_ip4s) { 1342 error = EPERM; 1343 goto done_deref_locked; 1344 } 1345 } 1346 } 1347 /* 1348 * Check for conflicting IP addresses. We permit them 1349 * if there is no more than one IP on each jail. If 1350 * there is a duplicate on a jail with more than one 1351 * IP stop checking and return error. 1352 */ 1353 tppr = ppr; 1354#ifdef VIMAGE 1355 for (; tppr != &prison0; tppr = tppr->pr_parent) 1356 if (tppr->pr_flags & PR_VNET) 1357 break; 1358#endif 1359 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1360 if (tpr == pr || 1361#ifdef VIMAGE 1362 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1363#endif 1364 tpr->pr_uref == 0) { 1365 descend = 0; 1366 continue; 1367 } 1368 if (!(tpr->pr_flags & PR_IP4_USER)) 1369 continue; 1370 descend = 0; 1371 if (tpr->pr_ip4 == NULL || 1372 (ip4s == 1 && tpr->pr_ip4s == 1)) 1373 continue; 1374 for (ii = 0; ii < ip4s; ii++) { 1375 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) { 1376 error = EADDRINUSE; 1377 vfs_opterror(opts, 1378 "IPv4 addresses clash"); 1379 goto done_deref_locked; 1380 } 1381 } 1382 } 1383 } 1384#endif 1385#ifdef INET6 1386 if (ip6s > 0) { 1387 if (ppr->pr_flags & PR_IP6) { 1388 /* 1389 * Make sure the new set of IP addresses is a 1390 * subset of the parent's list. 1391 */ 1392 for (ij = 0; ij < ppr->pr_ip6s; ij++) 1393 if (IN6_ARE_ADDR_EQUAL(&ip6[0], 1394 &ppr->pr_ip6[ij])) 1395 break; 1396 if (ij == ppr->pr_ip6s) { 1397 error = EPERM; 1398 goto done_deref_locked; 1399 } 1400 if (ip6s > 1) { 1401 for (ii = ij = 1; ii < ip6s; ii++) { 1402 if (IN6_ARE_ADDR_EQUAL(&ip6[ii], 1403 &ppr->pr_ip6[0])) 1404 continue; 1405 for (; ij < ppr->pr_ip6s; ij++) 1406 if (IN6_ARE_ADDR_EQUAL( 1407 &ip6[ii], &ppr->pr_ip6[ij])) 1408 break; 1409 if (ij == ppr->pr_ip6s) 1410 break; 1411 } 1412 if (ij == ppr->pr_ip6s) { 1413 error = EPERM; 1414 goto done_deref_locked; 1415 } 1416 } 1417 } 1418 /* Check for conflicting IP addresses. */ 1419 tppr = ppr; 1420#ifdef VIMAGE 1421 for (; tppr != &prison0; tppr = tppr->pr_parent) 1422 if (tppr->pr_flags & PR_VNET) 1423 break; 1424#endif 1425 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) { 1426 if (tpr == pr || 1427#ifdef VIMAGE 1428 (tpr != tppr && (tpr->pr_flags & PR_VNET)) || 1429#endif 1430 tpr->pr_uref == 0) { 1431 descend = 0; 1432 continue; 1433 } 1434 if (!(tpr->pr_flags & PR_IP6_USER)) 1435 continue; 1436 descend = 0; 1437 if (tpr->pr_ip6 == NULL || 1438 (ip6s == 1 && tpr->pr_ip6s == 1)) 1439 continue; 1440 for (ii = 0; ii < ip6s; ii++) { 1441 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) { 1442 error = EADDRINUSE; 1443 vfs_opterror(opts, 1444 "IPv6 addresses clash"); 1445 goto done_deref_locked; 1446 } 1447 } 1448 } 1449 } 1450#endif 1451 onamelen = namelen = 0; 1452 if (name != NULL) { 1453 /* Give a default name of the jid. */ 1454 if (name[0] == '\0') 1455 snprintf(name = numbuf, sizeof(numbuf), "%d", jid); 1456 else if (*namelc == '0' || (strtoul(namelc, &p, 10) != jid && 1457 *p == '\0')) { 1458 error = EINVAL; 1459 vfs_opterror(opts, 1460 "name cannot be numeric (unless it is the jid)"); 1461 goto done_deref_locked; 1462 } 1463 /* 1464 * Make sure the name isn't too long for the prison or its 1465 * children. 1466 */ 1467 onamelen = strlen(pr->pr_name); 1468 namelen = strlen(name); 1469 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) { 1470 error = ENAMETOOLONG; 1471 goto done_deref_locked; 1472 } 1473 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1474 if (strlen(tpr->pr_name) + (namelen - onamelen) >= 1475 sizeof(pr->pr_name)) { 1476 error = ENAMETOOLONG; 1477 goto done_deref_locked; 1478 } 1479 } 1480 } 1481 if (pr_allow & ~ppr->pr_allow) { 1482 error = EPERM; 1483 goto done_deref_locked; 1484 } 1485 1486 /* Set the parameters of the prison. */ 1487#ifdef INET 1488 redo_ip4 = 0; 1489 if (pr_flags & PR_IP4_USER) { 1490 pr->pr_flags |= PR_IP4; 1491 free(pr->pr_ip4, M_PRISON); 1492 pr->pr_ip4s = ip4s; 1493 pr->pr_ip4 = ip4; 1494 ip4 = NULL; 1495 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1496#ifdef VIMAGE 1497 if (tpr->pr_flags & PR_VNET) { 1498 descend = 0; 1499 continue; 1500 } 1501#endif 1502 if (prison_restrict_ip4(tpr, NULL)) { 1503 redo_ip4 = 1; 1504 descend = 0; 1505 } 1506 } 1507 } 1508#endif 1509#ifdef INET6 1510 redo_ip6 = 0; 1511 if (pr_flags & PR_IP6_USER) { 1512 pr->pr_flags |= PR_IP6; 1513 free(pr->pr_ip6, M_PRISON); 1514 pr->pr_ip6s = ip6s; 1515 pr->pr_ip6 = ip6; 1516 ip6 = NULL; 1517 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1518#ifdef VIMAGE 1519 if (tpr->pr_flags & PR_VNET) { 1520 descend = 0; 1521 continue; 1522 } 1523#endif 1524 if (prison_restrict_ip6(tpr, NULL)) { 1525 redo_ip6 = 1; 1526 descend = 0; 1527 } 1528 } 1529 } 1530#endif 1531 if (gotslevel) { 1532 pr->pr_securelevel = slevel; 1533 /* Set all child jails to be at least this level. */ 1534 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1535 if (tpr->pr_securelevel < slevel) 1536 tpr->pr_securelevel = slevel; 1537 } 1538 if (gotchildmax) { 1539 pr->pr_childmax = childmax; 1540 /* Set all child jails to under this limit. */ 1541 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level) 1542 if (tpr->pr_childmax > childmax - level) 1543 tpr->pr_childmax = childmax > level 1544 ? childmax - level : 0; 1545 } 1546 if (gotenforce) { 1547 pr->pr_enforce_statfs = enforce; 1548 /* Pass this restriction on to the children. */ 1549 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1550 if (tpr->pr_enforce_statfs < enforce) 1551 tpr->pr_enforce_statfs = enforce; 1552 } 1553 if (name != NULL) { 1554 if (ppr == &prison0) 1555 strlcpy(pr->pr_name, name, sizeof(pr->pr_name)); 1556 else 1557 snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s", 1558 ppr->pr_name, name); 1559 /* Change this component of child names. */ 1560 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1561 bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen, 1562 strlen(tpr->pr_name + onamelen) + 1); 1563 bcopy(pr->pr_name, tpr->pr_name, namelen); 1564 } 1565 } 1566 if (path != NULL) { 1567 /* Try to keep a real-rooted full pathname. */ 1568 if (path[0] == '/' && strcmp(mypr->pr_path, "/")) 1569 snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s", 1570 mypr->pr_path, path); 1571 else 1572 strlcpy(pr->pr_path, path, sizeof(pr->pr_path)); 1573 pr->pr_root = root; 1574 } 1575 if (PR_HOST & ch_flags & ~pr_flags) { 1576 if (pr->pr_flags & PR_HOST) { 1577 /* 1578 * Copy the parent's host info. As with pr_ip4 above, 1579 * the lack of a lock on the parent is not a problem; 1580 * it is always set with allprison_lock at least 1581 * shared, and is held exclusively here. 1582 */ 1583 strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname, 1584 sizeof(pr->pr_hostname)); 1585 strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname, 1586 sizeof(pr->pr_domainname)); 1587 strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid, 1588 sizeof(pr->pr_hostuuid)); 1589 pr->pr_hostid = pr->pr_parent->pr_hostid; 1590 } 1591 } else if (host != NULL || domain != NULL || uuid != NULL || gothid) { 1592 /* Set this prison, and any descendants without PR_HOST. */ 1593 if (host != NULL) 1594 strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname)); 1595 if (domain != NULL) 1596 strlcpy(pr->pr_domainname, domain, 1597 sizeof(pr->pr_domainname)); 1598 if (uuid != NULL) 1599 strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid)); 1600 if (gothid) 1601 pr->pr_hostid = hid; 1602 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1603 if (tpr->pr_flags & PR_HOST) 1604 descend = 0; 1605 else { 1606 if (host != NULL) 1607 strlcpy(tpr->pr_hostname, 1608 pr->pr_hostname, 1609 sizeof(tpr->pr_hostname)); 1610 if (domain != NULL) 1611 strlcpy(tpr->pr_domainname, 1612 pr->pr_domainname, 1613 sizeof(tpr->pr_domainname)); 1614 if (uuid != NULL) 1615 strlcpy(tpr->pr_hostuuid, 1616 pr->pr_hostuuid, 1617 sizeof(tpr->pr_hostuuid)); 1618 if (gothid) 1619 tpr->pr_hostid = hid; 1620 } 1621 } 1622 } 1623 if ((tallow = ch_allow & ~pr_allow)) { 1624 /* Clear allow bits in all children. */ 1625 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) 1626 tpr->pr_allow &= ~tallow; 1627 } 1628 pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow; 1629 /* 1630 * Persistent prisons get an extra reference, and prisons losing their 1631 * persist flag lose that reference. Only do this for existing prisons 1632 * for now, so new ones will remain unseen until after the module 1633 * handlers have completed. 1634 */ 1635 if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) { 1636 if (pr_flags & PR_PERSIST) { 1637 pr->pr_ref++; 1638 pr->pr_uref++; 1639 } else { 1640 pr->pr_ref--; 1641 pr->pr_uref--; 1642 } 1643 } 1644 pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags; 1645 mtx_unlock(&pr->pr_mtx); 1646 1647 /* Locks may have prevented a complete restriction of child IP 1648 * addresses. If so, allocate some more memory and try again. 1649 */ 1650#ifdef INET 1651 while (redo_ip4) { 1652 ip4s = pr->pr_ip4s; 1653 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK); 1654 mtx_lock(&pr->pr_mtx); 1655 redo_ip4 = 0; 1656 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1657#ifdef VIMAGE 1658 if (tpr->pr_flags & PR_VNET) { 1659 descend = 0; 1660 continue; 1661 } 1662#endif 1663 if (prison_restrict_ip4(tpr, ip4)) { 1664 if (ip4 != NULL) 1665 ip4 = NULL; 1666 else 1667 redo_ip4 = 1; 1668 } 1669 } 1670 mtx_unlock(&pr->pr_mtx); 1671 } 1672#endif 1673#ifdef INET6 1674 while (redo_ip6) { 1675 ip6s = pr->pr_ip6s; 1676 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK); 1677 mtx_lock(&pr->pr_mtx); 1678 redo_ip6 = 0; 1679 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) { 1680#ifdef VIMAGE 1681 if (tpr->pr_flags & PR_VNET) { 1682 descend = 0; 1683 continue; 1684 } 1685#endif 1686 if (prison_restrict_ip6(tpr, ip6)) { 1687 if (ip6 != NULL) 1688 ip6 = NULL; 1689 else 1690 redo_ip6 = 1; 1691 } 1692 } 1693 mtx_unlock(&pr->pr_mtx); 1694 } 1695#endif 1696 1697 /* Let the modules do their work. */ 1698 sx_downgrade(&allprison_lock); 1699 if (created) { 1700 error = osd_jail_call(pr, PR_METHOD_CREATE, opts); 1701 if (error) { 1702 prison_deref(pr, PD_LIST_SLOCKED); 1703 goto done_errmsg; 1704 } 1705 } 1706 error = osd_jail_call(pr, PR_METHOD_SET, opts); 1707 if (error) { 1708 prison_deref(pr, created 1709 ? PD_LIST_SLOCKED 1710 : PD_DEREF | PD_LIST_SLOCKED); 1711 goto done_errmsg; 1712 } 1713 1714 /* Attach this process to the prison if requested. */ 1715 if (flags & JAIL_ATTACH) { 1716 mtx_lock(&pr->pr_mtx); 1717 error = do_jail_attach(td, pr); 1718 if (error) { 1719 vfs_opterror(opts, "attach failed"); 1720 if (!created) 1721 prison_deref(pr, PD_DEREF); 1722 goto done_errmsg; 1723 } 1724 } 1725 1726 /* 1727 * Now that it is all there, drop the temporary reference from existing 1728 * prisons. Or add a reference to newly created persistent prisons 1729 * (which was not done earlier so that the prison would not be publicly 1730 * visible). 1731 */ 1732 if (!created) { 1733 prison_deref(pr, (flags & JAIL_ATTACH) 1734 ? PD_DEREF 1735 : PD_DEREF | PD_LIST_SLOCKED); 1736 } else { 1737 if (pr_flags & PR_PERSIST) { 1738 mtx_lock(&pr->pr_mtx); 1739 pr->pr_ref++; 1740 pr->pr_uref++; 1741 mtx_unlock(&pr->pr_mtx); 1742 } 1743 if (!(flags & JAIL_ATTACH)) 1744 sx_sunlock(&allprison_lock); 1745 } 1746 td->td_retval[0] = pr->pr_id; 1747 goto done_errmsg; 1748 1749 done_deref_locked: 1750 prison_deref(pr, created 1751 ? PD_LOCKED | PD_LIST_XLOCKED 1752 : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 1753 goto done_releroot; 1754 done_unlock_list: 1755 sx_xunlock(&allprison_lock); 1756 done_releroot: 1757 if (root != NULL) { 1758 vfslocked = VFS_LOCK_GIANT(root->v_mount); 1759 vrele(root); 1760 VFS_UNLOCK_GIANT(vfslocked); 1761 } 1762 done_errmsg: 1763 if (error) { 1764 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 1765 if (errmsg_len > 0) { 1766 errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1; 1767 if (errmsg_pos > 0) { 1768 if (optuio->uio_segflg == UIO_SYSSPACE) 1769 bcopy(errmsg, 1770 optuio->uio_iov[errmsg_pos].iov_base, 1771 errmsg_len); 1772 else 1773 copyout(errmsg, 1774 optuio->uio_iov[errmsg_pos].iov_base, 1775 errmsg_len); 1776 } 1777 } 1778 } 1779 done_free: 1780#ifdef INET 1781 free(ip4, M_PRISON); 1782#endif 1783#ifdef INET6 1784 free(ip6, M_PRISON); 1785#endif 1786 vfs_freeopts(opts); 1787 return (error); 1788} 1789 1790 1791/* 1792 * struct jail_get_args { 1793 * struct iovec *iovp; 1794 * unsigned int iovcnt; 1795 * int flags; 1796 * }; 1797 */ 1798int 1799jail_get(struct thread *td, struct jail_get_args *uap) 1800{ 1801 struct uio *auio; 1802 int error; 1803 1804 /* Check that we have an even number of iovecs. */ 1805 if (uap->iovcnt & 1) 1806 return (EINVAL); 1807 1808 error = copyinuio(uap->iovp, uap->iovcnt, &auio); 1809 if (error) 1810 return (error); 1811 error = kern_jail_get(td, auio, uap->flags); 1812 if (error == 0) 1813 error = copyout(auio->uio_iov, uap->iovp, 1814 uap->iovcnt * sizeof (struct iovec)); 1815 free(auio, M_IOV); 1816 return (error); 1817} 1818 1819int 1820kern_jail_get(struct thread *td, struct uio *optuio, int flags) 1821{ 1822 struct prison *pr, *mypr; 1823 struct vfsopt *opt; 1824 struct vfsoptlist *opts; 1825 char *errmsg, *name; 1826 int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos; 1827 1828 if (flags & ~JAIL_GET_MASK) 1829 return (EINVAL); 1830 1831 /* Get the parameter list. */ 1832 error = vfs_buildopts(optuio, &opts); 1833 if (error) 1834 return (error); 1835 errmsg_pos = vfs_getopt_pos(opts, "errmsg"); 1836 mypr = td->td_ucred->cr_prison; 1837 1838 /* 1839 * Find the prison specified by one of: lastjid, jid, name. 1840 */ 1841 sx_slock(&allprison_lock); 1842 error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid)); 1843 if (error == 0) { 1844 TAILQ_FOREACH(pr, &allprison, pr_list) { 1845 if (pr->pr_id > jid && prison_ischild(mypr, pr)) { 1846 mtx_lock(&pr->pr_mtx); 1847 if (pr->pr_ref > 0 && 1848 (pr->pr_uref > 0 || (flags & JAIL_DYING))) 1849 break; 1850 mtx_unlock(&pr->pr_mtx); 1851 } 1852 } 1853 if (pr != NULL) 1854 goto found_prison; 1855 error = ENOENT; 1856 vfs_opterror(opts, "no jail after %d", jid); 1857 goto done_unlock_list; 1858 } else if (error != ENOENT) 1859 goto done_unlock_list; 1860 1861 error = vfs_copyopt(opts, "jid", &jid, sizeof(jid)); 1862 if (error == 0) { 1863 if (jid != 0) { 1864 pr = prison_find_child(mypr, jid); 1865 if (pr != NULL) { 1866 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1867 mtx_unlock(&pr->pr_mtx); 1868 error = ENOENT; 1869 vfs_opterror(opts, "jail %d is dying", 1870 jid); 1871 goto done_unlock_list; 1872 } 1873 goto found_prison; 1874 } 1875 error = ENOENT; 1876 vfs_opterror(opts, "jail %d not found", jid); 1877 goto done_unlock_list; 1878 } 1879 } else if (error != ENOENT) 1880 goto done_unlock_list; 1881 1882 error = vfs_getopt(opts, "name", (void **)&name, &len); 1883 if (error == 0) { 1884 if (len == 0 || name[len - 1] != '\0') { 1885 error = EINVAL; 1886 goto done_unlock_list; 1887 } 1888 pr = prison_find_name(mypr, name); 1889 if (pr != NULL) { 1890 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) { 1891 mtx_unlock(&pr->pr_mtx); 1892 error = ENOENT; 1893 vfs_opterror(opts, "jail \"%s\" is dying", 1894 name); 1895 goto done_unlock_list; 1896 } 1897 goto found_prison; 1898 } 1899 error = ENOENT; 1900 vfs_opterror(opts, "jail \"%s\" not found", name); 1901 goto done_unlock_list; 1902 } else if (error != ENOENT) 1903 goto done_unlock_list; 1904 1905 vfs_opterror(opts, "no jail specified"); 1906 error = ENOENT; 1907 goto done_unlock_list; 1908 1909 found_prison: 1910 /* Get the parameters of the prison. */ 1911 pr->pr_ref++; 1912 locked = PD_LOCKED; 1913 td->td_retval[0] = pr->pr_id; 1914 error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id)); 1915 if (error != 0 && error != ENOENT) 1916 goto done_deref; 1917 i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id; 1918 error = vfs_setopt(opts, "parent", &i, sizeof(i)); 1919 if (error != 0 && error != ENOENT) 1920 goto done_deref; 1921 error = vfs_setopts(opts, "name", prison_name(mypr, pr)); 1922 if (error != 0 && error != ENOENT) 1923 goto done_deref; 1924 error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id, 1925 sizeof(pr->pr_cpuset->cs_id)); 1926 if (error != 0 && error != ENOENT) 1927 goto done_deref; 1928 error = vfs_setopts(opts, "path", prison_path(mypr, pr)); 1929 if (error != 0 && error != ENOENT) 1930 goto done_deref; 1931#ifdef INET 1932 error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4, 1933 pr->pr_ip4s * sizeof(*pr->pr_ip4)); 1934 if (error != 0 && error != ENOENT) 1935 goto done_deref; 1936#endif 1937#ifdef INET6 1938 error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6, 1939 pr->pr_ip6s * sizeof(*pr->pr_ip6)); 1940 if (error != 0 && error != ENOENT) 1941 goto done_deref; 1942#endif 1943 error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel, 1944 sizeof(pr->pr_securelevel)); 1945 if (error != 0 && error != ENOENT) 1946 goto done_deref; 1947 error = vfs_setopt(opts, "children.cur", &pr->pr_childcount, 1948 sizeof(pr->pr_childcount)); 1949 if (error != 0 && error != ENOENT) 1950 goto done_deref; 1951 error = vfs_setopt(opts, "children.max", &pr->pr_childmax, 1952 sizeof(pr->pr_childmax)); 1953 if (error != 0 && error != ENOENT) 1954 goto done_deref; 1955 error = vfs_setopts(opts, "host.hostname", pr->pr_hostname); 1956 if (error != 0 && error != ENOENT) 1957 goto done_deref; 1958 error = vfs_setopts(opts, "host.domainname", pr->pr_domainname); 1959 if (error != 0 && error != ENOENT) 1960 goto done_deref; 1961 error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid); 1962 if (error != 0 && error != ENOENT) 1963 goto done_deref; 1964#ifdef COMPAT_FREEBSD32 1965 if (td->td_proc->p_sysent->sv_flags & SV_ILP32) { 1966 uint32_t hid32 = pr->pr_hostid; 1967 1968 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32)); 1969 } else 1970#endif 1971 error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid, 1972 sizeof(pr->pr_hostid)); 1973 if (error != 0 && error != ENOENT) 1974 goto done_deref; 1975 error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs, 1976 sizeof(pr->pr_enforce_statfs)); 1977 if (error != 0 && error != ENOENT) 1978 goto done_deref; 1979 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 1980 fi++) { 1981 if (pr_flag_names[fi] == NULL) 1982 continue; 1983 i = (pr->pr_flags & (1 << fi)) ? 1 : 0; 1984 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i)); 1985 if (error != 0 && error != ENOENT) 1986 goto done_deref; 1987 i = !i; 1988 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i)); 1989 if (error != 0 && error != ENOENT) 1990 goto done_deref; 1991 } 1992 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 1993 fi++) { 1994 i = pr->pr_flags & 1995 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 1996 i = pr_flag_jailsys[fi].disable && 1997 (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE 1998 : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW 1999 : JAIL_SYS_INHERIT; 2000 error = 2001 vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i)); 2002 if (error != 0 && error != ENOENT) 2003 goto done_deref; 2004 } 2005 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 2006 fi++) { 2007 if (pr_allow_names[fi] == NULL) 2008 continue; 2009 i = (pr->pr_allow & (1 << fi)) ? 1 : 0; 2010 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i)); 2011 if (error != 0 && error != ENOENT) 2012 goto done_deref; 2013 i = !i; 2014 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i)); 2015 if (error != 0 && error != ENOENT) 2016 goto done_deref; 2017 } 2018 i = (pr->pr_uref == 0); 2019 error = vfs_setopt(opts, "dying", &i, sizeof(i)); 2020 if (error != 0 && error != ENOENT) 2021 goto done_deref; 2022 i = !i; 2023 error = vfs_setopt(opts, "nodying", &i, sizeof(i)); 2024 if (error != 0 && error != ENOENT) 2025 goto done_deref; 2026 2027 /* Get the module parameters. */ 2028 mtx_unlock(&pr->pr_mtx); 2029 locked = 0; 2030 error = osd_jail_call(pr, PR_METHOD_GET, opts); 2031 if (error) 2032 goto done_deref; 2033 prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED); 2034 2035 /* By now, all parameters should have been noted. */ 2036 TAILQ_FOREACH(opt, opts, link) { 2037 if (!opt->seen && strcmp(opt->name, "errmsg")) { 2038 error = EINVAL; 2039 vfs_opterror(opts, "unknown parameter: %s", opt->name); 2040 goto done_errmsg; 2041 } 2042 } 2043 2044 /* Write the fetched parameters back to userspace. */ 2045 error = 0; 2046 TAILQ_FOREACH(opt, opts, link) { 2047 if (opt->pos >= 0 && opt->pos != errmsg_pos) { 2048 pos = 2 * opt->pos + 1; 2049 optuio->uio_iov[pos].iov_len = opt->len; 2050 if (opt->value != NULL) { 2051 if (optuio->uio_segflg == UIO_SYSSPACE) { 2052 bcopy(opt->value, 2053 optuio->uio_iov[pos].iov_base, 2054 opt->len); 2055 } else { 2056 error = copyout(opt->value, 2057 optuio->uio_iov[pos].iov_base, 2058 opt->len); 2059 if (error) 2060 break; 2061 } 2062 } 2063 } 2064 } 2065 goto done_errmsg; 2066 2067 done_deref: 2068 prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED); 2069 goto done_errmsg; 2070 2071 done_unlock_list: 2072 sx_sunlock(&allprison_lock); 2073 done_errmsg: 2074 if (error && errmsg_pos >= 0) { 2075 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len); 2076 errmsg_pos = 2 * errmsg_pos + 1; 2077 if (errmsg_len > 0) { 2078 if (optuio->uio_segflg == UIO_SYSSPACE) 2079 bcopy(errmsg, 2080 optuio->uio_iov[errmsg_pos].iov_base, 2081 errmsg_len); 2082 else 2083 copyout(errmsg, 2084 optuio->uio_iov[errmsg_pos].iov_base, 2085 errmsg_len); 2086 } 2087 } 2088 vfs_freeopts(opts); 2089 return (error); 2090} 2091 2092 2093/* 2094 * struct jail_remove_args { 2095 * int jid; 2096 * }; 2097 */ 2098int 2099jail_remove(struct thread *td, struct jail_remove_args *uap) 2100{ 2101 struct prison *pr, *cpr, *lpr, *tpr; 2102 int descend, error; 2103 2104 error = priv_check(td, PRIV_JAIL_REMOVE); 2105 if (error) 2106 return (error); 2107 2108 sx_xlock(&allprison_lock); 2109 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2110 if (pr == NULL) { 2111 sx_xunlock(&allprison_lock); 2112 return (EINVAL); 2113 } 2114 2115 /* Remove all descendants of this prison, then remove this prison. */ 2116 pr->pr_ref++; 2117 pr->pr_flags |= PR_REMOVE; 2118 if (!LIST_EMPTY(&pr->pr_children)) { 2119 mtx_unlock(&pr->pr_mtx); 2120 lpr = NULL; 2121 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 2122 mtx_lock(&cpr->pr_mtx); 2123 if (cpr->pr_ref > 0) { 2124 tpr = cpr; 2125 cpr->pr_ref++; 2126 cpr->pr_flags |= PR_REMOVE; 2127 } else { 2128 /* Already removed - do not do it again. */ 2129 tpr = NULL; 2130 } 2131 mtx_unlock(&cpr->pr_mtx); 2132 if (lpr != NULL) { 2133 mtx_lock(&lpr->pr_mtx); 2134 prison_remove_one(lpr); 2135 sx_xlock(&allprison_lock); 2136 } 2137 lpr = tpr; 2138 } 2139 if (lpr != NULL) { 2140 mtx_lock(&lpr->pr_mtx); 2141 prison_remove_one(lpr); 2142 sx_xlock(&allprison_lock); 2143 } 2144 mtx_lock(&pr->pr_mtx); 2145 } 2146 prison_remove_one(pr); 2147 return (0); 2148} 2149 2150static void 2151prison_remove_one(struct prison *pr) 2152{ 2153 struct proc *p; 2154 int deuref; 2155 2156 /* If the prison was persistent, it is not anymore. */ 2157 deuref = 0; 2158 if (pr->pr_flags & PR_PERSIST) { 2159 pr->pr_ref--; 2160 deuref = PD_DEUREF; 2161 pr->pr_flags &= ~PR_PERSIST; 2162 } 2163 2164 /* 2165 * jail_remove added a reference. If that's the only one, remove 2166 * the prison now. 2167 */ 2168 KASSERT(pr->pr_ref > 0, 2169 ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id)); 2170 if (pr->pr_ref == 1) { 2171 prison_deref(pr, 2172 deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED); 2173 return; 2174 } 2175 2176 mtx_unlock(&pr->pr_mtx); 2177 sx_xunlock(&allprison_lock); 2178 /* 2179 * Kill all processes unfortunate enough to be attached to this prison. 2180 */ 2181 sx_slock(&allproc_lock); 2182 LIST_FOREACH(p, &allproc, p_list) { 2183 PROC_LOCK(p); 2184 if (p->p_state != PRS_NEW && p->p_ucred && 2185 p->p_ucred->cr_prison == pr) 2186 psignal(p, SIGKILL); 2187 PROC_UNLOCK(p); 2188 } 2189 sx_sunlock(&allproc_lock); 2190 /* Remove the temporary reference added by jail_remove. */ 2191 prison_deref(pr, deuref | PD_DEREF); 2192} 2193 2194 2195/* 2196 * struct jail_attach_args { 2197 * int jid; 2198 * }; 2199 */ 2200int 2201jail_attach(struct thread *td, struct jail_attach_args *uap) 2202{ 2203 struct prison *pr; 2204 int error; 2205 2206 error = priv_check(td, PRIV_JAIL_ATTACH); 2207 if (error) 2208 return (error); 2209 2210 sx_slock(&allprison_lock); 2211 pr = prison_find_child(td->td_ucred->cr_prison, uap->jid); 2212 if (pr == NULL) { 2213 sx_sunlock(&allprison_lock); 2214 return (EINVAL); 2215 } 2216 2217 /* 2218 * Do not allow a process to attach to a prison that is not 2219 * considered to be "alive". 2220 */ 2221 if (pr->pr_uref == 0) { 2222 mtx_unlock(&pr->pr_mtx); 2223 sx_sunlock(&allprison_lock); 2224 return (EINVAL); 2225 } 2226 2227 return (do_jail_attach(td, pr)); 2228} 2229 2230static int 2231do_jail_attach(struct thread *td, struct prison *pr) 2232{ 2233 struct prison *ppr; 2234 struct proc *p; 2235 struct ucred *newcred, *oldcred; 2236 int vfslocked, error; 2237 2238 /* 2239 * XXX: Note that there is a slight race here if two threads 2240 * in the same privileged process attempt to attach to two 2241 * different jails at the same time. It is important for 2242 * user processes not to do this, or they might end up with 2243 * a process root from one prison, but attached to the jail 2244 * of another. 2245 */ 2246 pr->pr_ref++; 2247 pr->pr_uref++; 2248 mtx_unlock(&pr->pr_mtx); 2249 2250 /* Let modules do whatever they need to prepare for attaching. */ 2251 error = osd_jail_call(pr, PR_METHOD_ATTACH, td); 2252 if (error) { 2253 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED); 2254 return (error); 2255 } 2256 sx_sunlock(&allprison_lock); 2257 2258 /* 2259 * Reparent the newly attached process to this jail. 2260 */ 2261 ppr = td->td_ucred->cr_prison; 2262 p = td->td_proc; 2263 error = cpuset_setproc_update_set(p, pr->pr_cpuset); 2264 if (error) 2265 goto e_revert_osd; 2266 2267 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount); 2268 vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY); 2269 if ((error = change_dir(pr->pr_root, td)) != 0) 2270 goto e_unlock; 2271#ifdef MAC 2272 if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root))) 2273 goto e_unlock; 2274#endif 2275 VOP_UNLOCK(pr->pr_root, 0); 2276 if ((error = change_root(pr->pr_root, td))) 2277 goto e_unlock_giant; 2278 VFS_UNLOCK_GIANT(vfslocked); 2279 2280 newcred = crget(); 2281 PROC_LOCK(p); 2282 oldcred = p->p_ucred; 2283 setsugid(p); 2284 crcopy(newcred, oldcred); 2285 newcred->cr_prison = pr; 2286 p->p_ucred = newcred; 2287 PROC_UNLOCK(p); 2288 crfree(oldcred); 2289 prison_deref(ppr, PD_DEREF | PD_DEUREF); 2290 return (0); 2291 e_unlock: 2292 VOP_UNLOCK(pr->pr_root, 0); 2293 e_unlock_giant: 2294 VFS_UNLOCK_GIANT(vfslocked); 2295 e_revert_osd: 2296 /* Tell modules this thread is still in its old jail after all. */ 2297 (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td); 2298 prison_deref(pr, PD_DEREF | PD_DEUREF); 2299 return (error); 2300} 2301 2302 2303/* 2304 * Returns a locked prison instance, or NULL on failure. 2305 */ 2306struct prison * 2307prison_find(int prid) 2308{ 2309 struct prison *pr; 2310 2311 sx_assert(&allprison_lock, SX_LOCKED); 2312 TAILQ_FOREACH(pr, &allprison, pr_list) { 2313 if (pr->pr_id == prid) { 2314 mtx_lock(&pr->pr_mtx); 2315 if (pr->pr_ref > 0) 2316 return (pr); 2317 mtx_unlock(&pr->pr_mtx); 2318 } 2319 } 2320 return (NULL); 2321} 2322 2323/* 2324 * Find a prison that is a descendant of mypr. Returns a locked prison or NULL. 2325 */ 2326struct prison * 2327prison_find_child(struct prison *mypr, int prid) 2328{ 2329 struct prison *pr; 2330 int descend; 2331 2332 sx_assert(&allprison_lock, SX_LOCKED); 2333 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2334 if (pr->pr_id == prid) { 2335 mtx_lock(&pr->pr_mtx); 2336 if (pr->pr_ref > 0) 2337 return (pr); 2338 mtx_unlock(&pr->pr_mtx); 2339 } 2340 } 2341 return (NULL); 2342} 2343 2344/* 2345 * Look for the name relative to mypr. Returns a locked prison or NULL. 2346 */ 2347struct prison * 2348prison_find_name(struct prison *mypr, const char *name) 2349{ 2350 struct prison *pr, *deadpr; 2351 size_t mylen; 2352 int descend; 2353 2354 sx_assert(&allprison_lock, SX_LOCKED); 2355 mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1; 2356 again: 2357 deadpr = NULL; 2358 FOREACH_PRISON_DESCENDANT(mypr, pr, descend) { 2359 if (!strcmp(pr->pr_name + mylen, name)) { 2360 mtx_lock(&pr->pr_mtx); 2361 if (pr->pr_ref > 0) { 2362 if (pr->pr_uref > 0) 2363 return (pr); 2364 deadpr = pr; 2365 } 2366 mtx_unlock(&pr->pr_mtx); 2367 } 2368 } 2369 /* There was no valid prison - perhaps there was a dying one. */ 2370 if (deadpr != NULL) { 2371 mtx_lock(&deadpr->pr_mtx); 2372 if (deadpr->pr_ref == 0) { 2373 mtx_unlock(&deadpr->pr_mtx); 2374 goto again; 2375 } 2376 } 2377 return (deadpr); 2378} 2379 2380/* 2381 * See if a prison has the specific flag set. 2382 */ 2383int 2384prison_flag(struct ucred *cred, unsigned flag) 2385{ 2386 2387 /* This is an atomic read, so no locking is necessary. */ 2388 return (cred->cr_prison->pr_flags & flag); 2389} 2390 2391int 2392prison_allow(struct ucred *cred, unsigned flag) 2393{ 2394 2395 /* This is an atomic read, so no locking is necessary. */ 2396 return (cred->cr_prison->pr_allow & flag); 2397} 2398 2399/* 2400 * Remove a prison reference. If that was the last reference, remove the 2401 * prison itself - but not in this context in case there are locks held. 2402 */ 2403void 2404prison_free_locked(struct prison *pr) 2405{ 2406 2407 mtx_assert(&pr->pr_mtx, MA_OWNED); 2408 pr->pr_ref--; 2409 if (pr->pr_ref == 0) { 2410 mtx_unlock(&pr->pr_mtx); 2411 TASK_INIT(&pr->pr_task, 0, prison_complete, pr); 2412 taskqueue_enqueue(taskqueue_thread, &pr->pr_task); 2413 return; 2414 } 2415 mtx_unlock(&pr->pr_mtx); 2416} 2417 2418void 2419prison_free(struct prison *pr) 2420{ 2421 2422 mtx_lock(&pr->pr_mtx); 2423 prison_free_locked(pr); 2424} 2425 2426static void 2427prison_complete(void *context, int pending) 2428{ 2429 2430 prison_deref((struct prison *)context, 0); 2431} 2432 2433/* 2434 * Remove a prison reference (usually). This internal version assumes no 2435 * mutexes are held, except perhaps the prison itself. If there are no more 2436 * references, release and delist the prison. On completion, the prison lock 2437 * and the allprison lock are both unlocked. 2438 */ 2439static void 2440prison_deref(struct prison *pr, int flags) 2441{ 2442 struct prison *ppr, *tpr; 2443 int vfslocked; 2444 2445 if (!(flags & PD_LOCKED)) 2446 mtx_lock(&pr->pr_mtx); 2447 /* Decrement the user references in a separate loop. */ 2448 if (flags & PD_DEUREF) { 2449 for (tpr = pr;; tpr = tpr->pr_parent) { 2450 if (tpr != pr) 2451 mtx_lock(&tpr->pr_mtx); 2452 if (--tpr->pr_uref > 0) 2453 break; 2454 KASSERT(tpr != &prison0, ("prison0 pr_uref=0")); 2455 mtx_unlock(&tpr->pr_mtx); 2456 } 2457 /* Done if there were only user references to remove. */ 2458 if (!(flags & PD_DEREF)) { 2459 mtx_unlock(&tpr->pr_mtx); 2460 if (flags & PD_LIST_SLOCKED) 2461 sx_sunlock(&allprison_lock); 2462 else if (flags & PD_LIST_XLOCKED) 2463 sx_xunlock(&allprison_lock); 2464 return; 2465 } 2466 if (tpr != pr) { 2467 mtx_unlock(&tpr->pr_mtx); 2468 mtx_lock(&pr->pr_mtx); 2469 } 2470 } 2471 2472 for (;;) { 2473 if (flags & PD_DEREF) 2474 pr->pr_ref--; 2475 /* If the prison still has references, nothing else to do. */ 2476 if (pr->pr_ref > 0) { 2477 mtx_unlock(&pr->pr_mtx); 2478 if (flags & PD_LIST_SLOCKED) 2479 sx_sunlock(&allprison_lock); 2480 else if (flags & PD_LIST_XLOCKED) 2481 sx_xunlock(&allprison_lock); 2482 return; 2483 } 2484 2485 mtx_unlock(&pr->pr_mtx); 2486 if (flags & PD_LIST_SLOCKED) { 2487 if (!sx_try_upgrade(&allprison_lock)) { 2488 sx_sunlock(&allprison_lock); 2489 sx_xlock(&allprison_lock); 2490 } 2491 } else if (!(flags & PD_LIST_XLOCKED)) 2492 sx_xlock(&allprison_lock); 2493 2494 TAILQ_REMOVE(&allprison, pr, pr_list); 2495 LIST_REMOVE(pr, pr_sibling); 2496 ppr = pr->pr_parent; 2497 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent) 2498 tpr->pr_childcount--; 2499 sx_xunlock(&allprison_lock); 2500 2501#ifdef VIMAGE 2502 if (pr->pr_vnet != ppr->pr_vnet) 2503 vnet_destroy(pr->pr_vnet); 2504#endif 2505 if (pr->pr_root != NULL) { 2506 vfslocked = VFS_LOCK_GIANT(pr->pr_root->v_mount); 2507 vrele(pr->pr_root); 2508 VFS_UNLOCK_GIANT(vfslocked); 2509 } 2510 mtx_destroy(&pr->pr_mtx); 2511#ifdef INET 2512 free(pr->pr_ip4, M_PRISON); 2513#endif 2514#ifdef INET6 2515 free(pr->pr_ip6, M_PRISON); 2516#endif 2517 if (pr->pr_cpuset != NULL) 2518 cpuset_rel(pr->pr_cpuset); 2519 osd_jail_exit(pr); 2520 free(pr, M_PRISON); 2521 2522 /* Removing a prison frees a reference on its parent. */ 2523 pr = ppr; 2524 mtx_lock(&pr->pr_mtx); 2525 flags = PD_DEREF; 2526 } 2527} 2528 2529void 2530prison_hold_locked(struct prison *pr) 2531{ 2532 2533 mtx_assert(&pr->pr_mtx, MA_OWNED); 2534 KASSERT(pr->pr_ref > 0, 2535 ("Trying to hold dead prison (jid=%d).", pr->pr_id)); 2536 pr->pr_ref++; 2537} 2538 2539void 2540prison_hold(struct prison *pr) 2541{ 2542 2543 mtx_lock(&pr->pr_mtx); 2544 prison_hold_locked(pr); 2545 mtx_unlock(&pr->pr_mtx); 2546} 2547 2548void 2549prison_proc_hold(struct prison *pr) 2550{ 2551 2552 mtx_lock(&pr->pr_mtx); 2553 KASSERT(pr->pr_uref > 0, 2554 ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id)); 2555 pr->pr_uref++; 2556 mtx_unlock(&pr->pr_mtx); 2557} 2558 2559void 2560prison_proc_free(struct prison *pr) 2561{ 2562 2563 mtx_lock(&pr->pr_mtx); 2564 KASSERT(pr->pr_uref > 0, 2565 ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id)); 2566 prison_deref(pr, PD_DEUREF | PD_LOCKED); 2567} 2568 2569 2570#ifdef INET 2571/* 2572 * Restrict a prison's IP address list with its parent's, possibly replacing 2573 * it. Return true if the replacement buffer was used (or would have been). 2574 */ 2575static int 2576prison_restrict_ip4(struct prison *pr, struct in_addr *newip4) 2577{ 2578 int ii, ij, used; 2579 struct prison *ppr; 2580 2581 ppr = pr->pr_parent; 2582 if (!(pr->pr_flags & PR_IP4_USER)) { 2583 /* This has no user settings, so just copy the parent's list. */ 2584 if (pr->pr_ip4s < ppr->pr_ip4s) { 2585 /* 2586 * There's no room for the parent's list. Use the 2587 * new list buffer, which is assumed to be big enough 2588 * (if it was passed). If there's no buffer, try to 2589 * allocate one. 2590 */ 2591 used = 1; 2592 if (newip4 == NULL) { 2593 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4), 2594 M_PRISON, M_NOWAIT); 2595 if (newip4 != NULL) 2596 used = 0; 2597 } 2598 if (newip4 != NULL) { 2599 bcopy(ppr->pr_ip4, newip4, 2600 ppr->pr_ip4s * sizeof(*newip4)); 2601 free(pr->pr_ip4, M_PRISON); 2602 pr->pr_ip4 = newip4; 2603 pr->pr_ip4s = ppr->pr_ip4s; 2604 } 2605 return (used); 2606 } 2607 pr->pr_ip4s = ppr->pr_ip4s; 2608 if (pr->pr_ip4s > 0) 2609 bcopy(ppr->pr_ip4, pr->pr_ip4, 2610 pr->pr_ip4s * sizeof(*newip4)); 2611 else if (pr->pr_ip4 != NULL) { 2612 free(pr->pr_ip4, M_PRISON); 2613 pr->pr_ip4 = NULL; 2614 } 2615 } else if (pr->pr_ip4s > 0) { 2616 /* Remove addresses that aren't in the parent. */ 2617 for (ij = 0; ij < ppr->pr_ip4s; ij++) 2618 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr) 2619 break; 2620 if (ij < ppr->pr_ip4s) 2621 ii = 1; 2622 else { 2623 bcopy(pr->pr_ip4 + 1, pr->pr_ip4, 2624 --pr->pr_ip4s * sizeof(*pr->pr_ip4)); 2625 ii = 0; 2626 } 2627 for (ij = 1; ii < pr->pr_ip4s; ) { 2628 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) { 2629 ii++; 2630 continue; 2631 } 2632 switch (ij >= ppr->pr_ip4s ? -1 : 2633 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) { 2634 case -1: 2635 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii, 2636 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4)); 2637 break; 2638 case 0: 2639 ii++; 2640 ij++; 2641 break; 2642 case 1: 2643 ij++; 2644 break; 2645 } 2646 } 2647 if (pr->pr_ip4s == 0) { 2648 pr->pr_flags |= PR_IP4_DISABLE; 2649 free(pr->pr_ip4, M_PRISON); 2650 pr->pr_ip4 = NULL; 2651 } 2652 } 2653 return (0); 2654} 2655 2656/* 2657 * Pass back primary IPv4 address of this jail. 2658 * 2659 * If not restricted return success but do not alter the address. Caller has 2660 * to make sure to initialize it correctly (e.g. INADDR_ANY). 2661 * 2662 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2663 * Address returned in NBO. 2664 */ 2665int 2666prison_get_ip4(struct ucred *cred, struct in_addr *ia) 2667{ 2668 struct prison *pr; 2669 2670 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2671 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2672 2673 pr = cred->cr_prison; 2674 if (!(pr->pr_flags & PR_IP4)) 2675 return (0); 2676 mtx_lock(&pr->pr_mtx); 2677 if (!(pr->pr_flags & PR_IP4)) { 2678 mtx_unlock(&pr->pr_mtx); 2679 return (0); 2680 } 2681 if (pr->pr_ip4 == NULL) { 2682 mtx_unlock(&pr->pr_mtx); 2683 return (EAFNOSUPPORT); 2684 } 2685 2686 ia->s_addr = pr->pr_ip4[0].s_addr; 2687 mtx_unlock(&pr->pr_mtx); 2688 return (0); 2689} 2690 2691/* 2692 * Return 1 if we should do proper source address selection or are not jailed. 2693 * We will return 0 if we should bypass source address selection in favour 2694 * of the primary jail IPv4 address. Only in this case *ia will be updated and 2695 * returned in NBO. 2696 * Return EAFNOSUPPORT, in case this jail does not allow IPv4. 2697 */ 2698int 2699prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia) 2700{ 2701 struct prison *pr; 2702 struct in_addr lia; 2703 int error; 2704 2705 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2706 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2707 2708 if (!jailed(cred)) 2709 return (1); 2710 2711 pr = cred->cr_prison; 2712 if (pr->pr_flags & PR_IP4_SADDRSEL) 2713 return (1); 2714 2715 lia.s_addr = INADDR_ANY; 2716 error = prison_get_ip4(cred, &lia); 2717 if (error) 2718 return (error); 2719 if (lia.s_addr == INADDR_ANY) 2720 return (1); 2721 2722 ia->s_addr = lia.s_addr; 2723 return (0); 2724} 2725 2726/* 2727 * Return true if pr1 and pr2 have the same IPv4 address restrictions. 2728 */ 2729int 2730prison_equal_ip4(struct prison *pr1, struct prison *pr2) 2731{ 2732 2733 if (pr1 == pr2) 2734 return (1); 2735 2736 /* 2737 * No need to lock since the PR_IP4_USER flag can't be altered for 2738 * existing prisons. 2739 */ 2740 while (pr1 != &prison0 && 2741#ifdef VIMAGE 2742 !(pr1->pr_flags & PR_VNET) && 2743#endif 2744 !(pr1->pr_flags & PR_IP4_USER)) 2745 pr1 = pr1->pr_parent; 2746 while (pr2 != &prison0 && 2747#ifdef VIMAGE 2748 !(pr2->pr_flags & PR_VNET) && 2749#endif 2750 !(pr2->pr_flags & PR_IP4_USER)) 2751 pr2 = pr2->pr_parent; 2752 return (pr1 == pr2); 2753} 2754 2755/* 2756 * Make sure our (source) address is set to something meaningful to this 2757 * jail. 2758 * 2759 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2760 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2761 * doesn't allow IPv4. Address passed in in NBO and returned in NBO. 2762 */ 2763int 2764prison_local_ip4(struct ucred *cred, struct in_addr *ia) 2765{ 2766 struct prison *pr; 2767 struct in_addr ia0; 2768 int error; 2769 2770 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2771 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2772 2773 pr = cred->cr_prison; 2774 if (!(pr->pr_flags & PR_IP4)) 2775 return (0); 2776 mtx_lock(&pr->pr_mtx); 2777 if (!(pr->pr_flags & PR_IP4)) { 2778 mtx_unlock(&pr->pr_mtx); 2779 return (0); 2780 } 2781 if (pr->pr_ip4 == NULL) { 2782 mtx_unlock(&pr->pr_mtx); 2783 return (EAFNOSUPPORT); 2784 } 2785 2786 ia0.s_addr = ntohl(ia->s_addr); 2787 if (ia0.s_addr == INADDR_LOOPBACK) { 2788 ia->s_addr = pr->pr_ip4[0].s_addr; 2789 mtx_unlock(&pr->pr_mtx); 2790 return (0); 2791 } 2792 2793 if (ia0.s_addr == INADDR_ANY) { 2794 /* 2795 * In case there is only 1 IPv4 address, bind directly. 2796 */ 2797 if (pr->pr_ip4s == 1) 2798 ia->s_addr = pr->pr_ip4[0].s_addr; 2799 mtx_unlock(&pr->pr_mtx); 2800 return (0); 2801 } 2802 2803 error = _prison_check_ip4(pr, ia); 2804 mtx_unlock(&pr->pr_mtx); 2805 return (error); 2806} 2807 2808/* 2809 * Rewrite destination address in case we will connect to loopback address. 2810 * 2811 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4. 2812 * Address passed in in NBO and returned in NBO. 2813 */ 2814int 2815prison_remote_ip4(struct ucred *cred, struct in_addr *ia) 2816{ 2817 struct prison *pr; 2818 2819 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2820 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2821 2822 pr = cred->cr_prison; 2823 if (!(pr->pr_flags & PR_IP4)) 2824 return (0); 2825 mtx_lock(&pr->pr_mtx); 2826 if (!(pr->pr_flags & PR_IP4)) { 2827 mtx_unlock(&pr->pr_mtx); 2828 return (0); 2829 } 2830 if (pr->pr_ip4 == NULL) { 2831 mtx_unlock(&pr->pr_mtx); 2832 return (EAFNOSUPPORT); 2833 } 2834 2835 if (ntohl(ia->s_addr) == INADDR_LOOPBACK) { 2836 ia->s_addr = pr->pr_ip4[0].s_addr; 2837 mtx_unlock(&pr->pr_mtx); 2838 return (0); 2839 } 2840 2841 /* 2842 * Return success because nothing had to be changed. 2843 */ 2844 mtx_unlock(&pr->pr_mtx); 2845 return (0); 2846} 2847 2848/* 2849 * Check if given address belongs to the jail referenced by cred/prison. 2850 * 2851 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail, 2852 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 2853 * doesn't allow IPv4. Address passed in in NBO. 2854 */ 2855static int 2856_prison_check_ip4(struct prison *pr, struct in_addr *ia) 2857{ 2858 int i, a, z, d; 2859 2860 /* 2861 * Check the primary IP. 2862 */ 2863 if (pr->pr_ip4[0].s_addr == ia->s_addr) 2864 return (0); 2865 2866 /* 2867 * All the other IPs are sorted so we can do a binary search. 2868 */ 2869 a = 0; 2870 z = pr->pr_ip4s - 2; 2871 while (a <= z) { 2872 i = (a + z) / 2; 2873 d = qcmp_v4(&pr->pr_ip4[i+1], ia); 2874 if (d > 0) 2875 z = i - 1; 2876 else if (d < 0) 2877 a = i + 1; 2878 else 2879 return (0); 2880 } 2881 2882 return (EADDRNOTAVAIL); 2883} 2884 2885int 2886prison_check_ip4(struct ucred *cred, struct in_addr *ia) 2887{ 2888 struct prison *pr; 2889 int error; 2890 2891 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 2892 KASSERT(ia != NULL, ("%s: ia is NULL", __func__)); 2893 2894 pr = cred->cr_prison; 2895 if (!(pr->pr_flags & PR_IP4)) 2896 return (0); 2897 mtx_lock(&pr->pr_mtx); 2898 if (!(pr->pr_flags & PR_IP4)) { 2899 mtx_unlock(&pr->pr_mtx); 2900 return (0); 2901 } 2902 if (pr->pr_ip4 == NULL) { 2903 mtx_unlock(&pr->pr_mtx); 2904 return (EAFNOSUPPORT); 2905 } 2906 2907 error = _prison_check_ip4(pr, ia); 2908 mtx_unlock(&pr->pr_mtx); 2909 return (error); 2910} 2911#endif 2912 2913#ifdef INET6 2914static int 2915prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6) 2916{ 2917 int ii, ij, used; 2918 struct prison *ppr; 2919 2920 ppr = pr->pr_parent; 2921 if (!(pr->pr_flags & PR_IP6_USER)) { 2922 /* This has no user settings, so just copy the parent's list. */ 2923 if (pr->pr_ip6s < ppr->pr_ip6s) { 2924 /* 2925 * There's no room for the parent's list. Use the 2926 * new list buffer, which is assumed to be big enough 2927 * (if it was passed). If there's no buffer, try to 2928 * allocate one. 2929 */ 2930 used = 1; 2931 if (newip6 == NULL) { 2932 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6), 2933 M_PRISON, M_NOWAIT); 2934 if (newip6 != NULL) 2935 used = 0; 2936 } 2937 if (newip6 != NULL) { 2938 bcopy(ppr->pr_ip6, newip6, 2939 ppr->pr_ip6s * sizeof(*newip6)); 2940 free(pr->pr_ip6, M_PRISON); 2941 pr->pr_ip6 = newip6; 2942 pr->pr_ip6s = ppr->pr_ip6s; 2943 } 2944 return (used); 2945 } 2946 pr->pr_ip6s = ppr->pr_ip6s; 2947 if (pr->pr_ip6s > 0) 2948 bcopy(ppr->pr_ip6, pr->pr_ip6, 2949 pr->pr_ip6s * sizeof(*newip6)); 2950 else if (pr->pr_ip6 != NULL) { 2951 free(pr->pr_ip6, M_PRISON); 2952 pr->pr_ip6 = NULL; 2953 } 2954 } else if (pr->pr_ip6s > 0) { 2955 /* Remove addresses that aren't in the parent. */ 2956 for (ij = 0; ij < ppr->pr_ip6s; ij++) 2957 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], 2958 &ppr->pr_ip6[ij])) 2959 break; 2960 if (ij < ppr->pr_ip6s) 2961 ii = 1; 2962 else { 2963 bcopy(pr->pr_ip6 + 1, pr->pr_ip6, 2964 --pr->pr_ip6s * sizeof(*pr->pr_ip6)); 2965 ii = 0; 2966 } 2967 for (ij = 1; ii < pr->pr_ip6s; ) { 2968 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii], 2969 &ppr->pr_ip6[0])) { 2970 ii++; 2971 continue; 2972 } 2973 switch (ij >= ppr->pr_ip4s ? -1 : 2974 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) { 2975 case -1: 2976 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii, 2977 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6)); 2978 break; 2979 case 0: 2980 ii++; 2981 ij++; 2982 break; 2983 case 1: 2984 ij++; 2985 break; 2986 } 2987 } 2988 if (pr->pr_ip6s == 0) { 2989 pr->pr_flags |= PR_IP6_DISABLE; 2990 free(pr->pr_ip6, M_PRISON); 2991 pr->pr_ip6 = NULL; 2992 } 2993 } 2994 return 0; 2995} 2996 2997/* 2998 * Pass back primary IPv6 address for this jail. 2999 * 3000 * If not restricted return success but do not alter the address. Caller has 3001 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). 3002 * 3003 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3004 */ 3005int 3006prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) 3007{ 3008 struct prison *pr; 3009 3010 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3011 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3012 3013 pr = cred->cr_prison; 3014 if (!(pr->pr_flags & PR_IP6)) 3015 return (0); 3016 mtx_lock(&pr->pr_mtx); 3017 if (!(pr->pr_flags & PR_IP6)) { 3018 mtx_unlock(&pr->pr_mtx); 3019 return (0); 3020 } 3021 if (pr->pr_ip6 == NULL) { 3022 mtx_unlock(&pr->pr_mtx); 3023 return (EAFNOSUPPORT); 3024 } 3025 3026 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3027 mtx_unlock(&pr->pr_mtx); 3028 return (0); 3029} 3030 3031/* 3032 * Return 1 if we should do proper source address selection or are not jailed. 3033 * We will return 0 if we should bypass source address selection in favour 3034 * of the primary jail IPv6 address. Only in this case *ia will be updated and 3035 * returned in NBO. 3036 * Return EAFNOSUPPORT, in case this jail does not allow IPv6. 3037 */ 3038int 3039prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6) 3040{ 3041 struct prison *pr; 3042 struct in6_addr lia6; 3043 int error; 3044 3045 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3046 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3047 3048 if (!jailed(cred)) 3049 return (1); 3050 3051 pr = cred->cr_prison; 3052 if (pr->pr_flags & PR_IP6_SADDRSEL) 3053 return (1); 3054 3055 lia6 = in6addr_any; 3056 error = prison_get_ip6(cred, &lia6); 3057 if (error) 3058 return (error); 3059 if (IN6_IS_ADDR_UNSPECIFIED(&lia6)) 3060 return (1); 3061 3062 bcopy(&lia6, ia6, sizeof(struct in6_addr)); 3063 return (0); 3064} 3065 3066/* 3067 * Return true if pr1 and pr2 have the same IPv6 address restrictions. 3068 */ 3069int 3070prison_equal_ip6(struct prison *pr1, struct prison *pr2) 3071{ 3072 3073 if (pr1 == pr2) 3074 return (1); 3075 3076 while (pr1 != &prison0 && 3077#ifdef VIMAGE 3078 !(pr1->pr_flags & PR_VNET) && 3079#endif 3080 !(pr1->pr_flags & PR_IP6_USER)) 3081 pr1 = pr1->pr_parent; 3082 while (pr2 != &prison0 && 3083#ifdef VIMAGE 3084 !(pr2->pr_flags & PR_VNET) && 3085#endif 3086 !(pr2->pr_flags & PR_IP6_USER)) 3087 pr2 = pr2->pr_parent; 3088 return (pr1 == pr2); 3089} 3090 3091/* 3092 * Make sure our (source) address is set to something meaningful to this jail. 3093 * 3094 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) 3095 * when needed while binding. 3096 * 3097 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3098 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3099 * doesn't allow IPv6. 3100 */ 3101int 3102prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) 3103{ 3104 struct prison *pr; 3105 int error; 3106 3107 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3108 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3109 3110 pr = cred->cr_prison; 3111 if (!(pr->pr_flags & PR_IP6)) 3112 return (0); 3113 mtx_lock(&pr->pr_mtx); 3114 if (!(pr->pr_flags & PR_IP6)) { 3115 mtx_unlock(&pr->pr_mtx); 3116 return (0); 3117 } 3118 if (pr->pr_ip6 == NULL) { 3119 mtx_unlock(&pr->pr_mtx); 3120 return (EAFNOSUPPORT); 3121 } 3122 3123 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3124 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3125 mtx_unlock(&pr->pr_mtx); 3126 return (0); 3127 } 3128 3129 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { 3130 /* 3131 * In case there is only 1 IPv6 address, and v6only is true, 3132 * then bind directly. 3133 */ 3134 if (v6only != 0 && pr->pr_ip6s == 1) 3135 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3136 mtx_unlock(&pr->pr_mtx); 3137 return (0); 3138 } 3139 3140 error = _prison_check_ip6(pr, ia6); 3141 mtx_unlock(&pr->pr_mtx); 3142 return (error); 3143} 3144 3145/* 3146 * Rewrite destination address in case we will connect to loopback address. 3147 * 3148 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. 3149 */ 3150int 3151prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) 3152{ 3153 struct prison *pr; 3154 3155 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3156 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3157 3158 pr = cred->cr_prison; 3159 if (!(pr->pr_flags & PR_IP6)) 3160 return (0); 3161 mtx_lock(&pr->pr_mtx); 3162 if (!(pr->pr_flags & PR_IP6)) { 3163 mtx_unlock(&pr->pr_mtx); 3164 return (0); 3165 } 3166 if (pr->pr_ip6 == NULL) { 3167 mtx_unlock(&pr->pr_mtx); 3168 return (EAFNOSUPPORT); 3169 } 3170 3171 if (IN6_IS_ADDR_LOOPBACK(ia6)) { 3172 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr)); 3173 mtx_unlock(&pr->pr_mtx); 3174 return (0); 3175 } 3176 3177 /* 3178 * Return success because nothing had to be changed. 3179 */ 3180 mtx_unlock(&pr->pr_mtx); 3181 return (0); 3182} 3183 3184/* 3185 * Check if given address belongs to the jail referenced by cred/prison. 3186 * 3187 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, 3188 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail 3189 * doesn't allow IPv6. 3190 */ 3191static int 3192_prison_check_ip6(struct prison *pr, struct in6_addr *ia6) 3193{ 3194 int i, a, z, d; 3195 3196 /* 3197 * Check the primary IP. 3198 */ 3199 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6)) 3200 return (0); 3201 3202 /* 3203 * All the other IPs are sorted so we can do a binary search. 3204 */ 3205 a = 0; 3206 z = pr->pr_ip6s - 2; 3207 while (a <= z) { 3208 i = (a + z) / 2; 3209 d = qcmp_v6(&pr->pr_ip6[i+1], ia6); 3210 if (d > 0) 3211 z = i - 1; 3212 else if (d < 0) 3213 a = i + 1; 3214 else 3215 return (0); 3216 } 3217 3218 return (EADDRNOTAVAIL); 3219} 3220 3221int 3222prison_check_ip6(struct ucred *cred, struct in6_addr *ia6) 3223{ 3224 struct prison *pr; 3225 int error; 3226 3227 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3228 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); 3229 3230 pr = cred->cr_prison; 3231 if (!(pr->pr_flags & PR_IP6)) 3232 return (0); 3233 mtx_lock(&pr->pr_mtx); 3234 if (!(pr->pr_flags & PR_IP6)) { 3235 mtx_unlock(&pr->pr_mtx); 3236 return (0); 3237 } 3238 if (pr->pr_ip6 == NULL) { 3239 mtx_unlock(&pr->pr_mtx); 3240 return (EAFNOSUPPORT); 3241 } 3242 3243 error = _prison_check_ip6(pr, ia6); 3244 mtx_unlock(&pr->pr_mtx); 3245 return (error); 3246} 3247#endif 3248 3249/* 3250 * Check if a jail supports the given address family. 3251 * 3252 * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT 3253 * if not. 3254 */ 3255int 3256prison_check_af(struct ucred *cred, int af) 3257{ 3258 struct prison *pr; 3259 int error; 3260 3261 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3262 3263 pr = cred->cr_prison; 3264#ifdef VIMAGE 3265 /* Prisons with their own network stack are not limited. */ 3266 if (prison_owns_vnet(cred)) 3267 return (0); 3268#endif 3269 3270 error = 0; 3271 switch (af) 3272 { 3273#ifdef INET 3274 case AF_INET: 3275 if (pr->pr_flags & PR_IP4) 3276 { 3277 mtx_lock(&pr->pr_mtx); 3278 if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL) 3279 error = EAFNOSUPPORT; 3280 mtx_unlock(&pr->pr_mtx); 3281 } 3282 break; 3283#endif 3284#ifdef INET6 3285 case AF_INET6: 3286 if (pr->pr_flags & PR_IP6) 3287 { 3288 mtx_lock(&pr->pr_mtx); 3289 if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL) 3290 error = EAFNOSUPPORT; 3291 mtx_unlock(&pr->pr_mtx); 3292 } 3293 break; 3294#endif 3295 case AF_LOCAL: 3296 case AF_ROUTE: 3297 break; 3298 default: 3299 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF)) 3300 error = EAFNOSUPPORT; 3301 } 3302 return (error); 3303} 3304 3305/* 3306 * Check if given address belongs to the jail referenced by cred (wrapper to 3307 * prison_check_ip[46]). 3308 * 3309 * Returns 0 if jail doesn't restrict the address family or if address belongs 3310 * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if 3311 * the jail doesn't allow the address family. IPv4 Address passed in in NBO. 3312 */ 3313int 3314prison_if(struct ucred *cred, struct sockaddr *sa) 3315{ 3316#ifdef INET 3317 struct sockaddr_in *sai; 3318#endif 3319#ifdef INET6 3320 struct sockaddr_in6 *sai6; 3321#endif 3322 int error; 3323 3324 KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); 3325 KASSERT(sa != NULL, ("%s: sa is NULL", __func__)); 3326 3327#ifdef VIMAGE 3328 if (prison_owns_vnet(cred)) 3329 return (0); 3330#endif 3331 3332 error = 0; 3333 switch (sa->sa_family) 3334 { 3335#ifdef INET 3336 case AF_INET: 3337 sai = (struct sockaddr_in *)sa; 3338 error = prison_check_ip4(cred, &sai->sin_addr); 3339 break; 3340#endif 3341#ifdef INET6 3342 case AF_INET6: 3343 sai6 = (struct sockaddr_in6 *)sa; 3344 error = prison_check_ip6(cred, &sai6->sin6_addr); 3345 break; 3346#endif 3347 default: 3348 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF)) 3349 error = EAFNOSUPPORT; 3350 } 3351 return (error); 3352} 3353 3354/* 3355 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH. 3356 */ 3357int 3358prison_check(struct ucred *cred1, struct ucred *cred2) 3359{ 3360 3361 return ((cred1->cr_prison == cred2->cr_prison || 3362 prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH); 3363} 3364 3365/* 3366 * Return 1 if p2 is a child of p1, otherwise 0. 3367 */ 3368int 3369prison_ischild(struct prison *pr1, struct prison *pr2) 3370{ 3371 3372 for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent) 3373 if (pr1 == pr2) 3374 return (1); 3375 return (0); 3376} 3377 3378/* 3379 * Return 1 if the passed credential is in a jail, otherwise 0. 3380 */ 3381int 3382jailed(struct ucred *cred) 3383{ 3384 3385 return (cred->cr_prison != &prison0); 3386} 3387 3388/* 3389 * Return 1 if the passed credential is in a jail and that jail does not 3390 * have its own virtual network stack, otherwise 0. 3391 */ 3392int 3393jailed_without_vnet(struct ucred *cred) 3394{ 3395 3396 if (!jailed(cred)) 3397 return (0); 3398#ifdef VIMAGE 3399 if (prison_owns_vnet(cred)) 3400 return (0); 3401#endif 3402 3403 return (1); 3404} 3405 3406/* 3407 * Return the correct hostname (domainname, et al) for the passed credential. 3408 */ 3409void 3410getcredhostname(struct ucred *cred, char *buf, size_t size) 3411{ 3412 struct prison *pr; 3413 3414 /* 3415 * A NULL credential can be used to shortcut to the physical 3416 * system's hostname. 3417 */ 3418 pr = (cred != NULL) ? cred->cr_prison : &prison0; 3419 mtx_lock(&pr->pr_mtx); 3420 strlcpy(buf, pr->pr_hostname, size); 3421 mtx_unlock(&pr->pr_mtx); 3422} 3423 3424void 3425getcreddomainname(struct ucred *cred, char *buf, size_t size) 3426{ 3427 3428 mtx_lock(&cred->cr_prison->pr_mtx); 3429 strlcpy(buf, cred->cr_prison->pr_domainname, size); 3430 mtx_unlock(&cred->cr_prison->pr_mtx); 3431} 3432 3433void 3434getcredhostuuid(struct ucred *cred, char *buf, size_t size) 3435{ 3436 3437 mtx_lock(&cred->cr_prison->pr_mtx); 3438 strlcpy(buf, cred->cr_prison->pr_hostuuid, size); 3439 mtx_unlock(&cred->cr_prison->pr_mtx); 3440} 3441 3442void 3443getcredhostid(struct ucred *cred, unsigned long *hostid) 3444{ 3445 3446 mtx_lock(&cred->cr_prison->pr_mtx); 3447 *hostid = cred->cr_prison->pr_hostid; 3448 mtx_unlock(&cred->cr_prison->pr_mtx); 3449} 3450 3451#ifdef VIMAGE 3452/* 3453 * Determine whether the prison represented by cred owns 3454 * its vnet rather than having it inherited. 3455 * 3456 * Returns 1 in case the prison owns the vnet, 0 otherwise. 3457 */ 3458int 3459prison_owns_vnet(struct ucred *cred) 3460{ 3461 3462 /* 3463 * vnets cannot be added/removed after jail creation, 3464 * so no need to lock here. 3465 */ 3466 return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0); 3467} 3468#endif 3469 3470/* 3471 * Determine whether the subject represented by cred can "see" 3472 * status of a mount point. 3473 * Returns: 0 for permitted, ENOENT otherwise. 3474 * XXX: This function should be called cr_canseemount() and should be 3475 * placed in kern_prot.c. 3476 */ 3477int 3478prison_canseemount(struct ucred *cred, struct mount *mp) 3479{ 3480 struct prison *pr; 3481 struct statfs *sp; 3482 size_t len; 3483 3484 pr = cred->cr_prison; 3485 if (pr->pr_enforce_statfs == 0) 3486 return (0); 3487 if (pr->pr_root->v_mount == mp) 3488 return (0); 3489 if (pr->pr_enforce_statfs == 2) 3490 return (ENOENT); 3491 /* 3492 * If jail's chroot directory is set to "/" we should be able to see 3493 * all mount-points from inside a jail. 3494 * This is ugly check, but this is the only situation when jail's 3495 * directory ends with '/'. 3496 */ 3497 if (strcmp(pr->pr_path, "/") == 0) 3498 return (0); 3499 len = strlen(pr->pr_path); 3500 sp = &mp->mnt_stat; 3501 if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0) 3502 return (ENOENT); 3503 /* 3504 * Be sure that we don't have situation where jail's root directory 3505 * is "/some/path" and mount point is "/some/pathpath". 3506 */ 3507 if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/') 3508 return (ENOENT); 3509 return (0); 3510} 3511 3512void 3513prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) 3514{ 3515 char jpath[MAXPATHLEN]; 3516 struct prison *pr; 3517 size_t len; 3518 3519 pr = cred->cr_prison; 3520 if (pr->pr_enforce_statfs == 0) 3521 return; 3522 if (prison_canseemount(cred, mp) != 0) { 3523 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3524 strlcpy(sp->f_mntonname, "[restricted]", 3525 sizeof(sp->f_mntonname)); 3526 return; 3527 } 3528 if (pr->pr_root->v_mount == mp) { 3529 /* 3530 * Clear current buffer data, so we are sure nothing from 3531 * the valid path left there. 3532 */ 3533 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3534 *sp->f_mntonname = '/'; 3535 return; 3536 } 3537 /* 3538 * If jail's chroot directory is set to "/" we should be able to see 3539 * all mount-points from inside a jail. 3540 */ 3541 if (strcmp(pr->pr_path, "/") == 0) 3542 return; 3543 len = strlen(pr->pr_path); 3544 strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath)); 3545 /* 3546 * Clear current buffer data, so we are sure nothing from 3547 * the valid path left there. 3548 */ 3549 bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); 3550 if (*jpath == '\0') { 3551 /* Should never happen. */ 3552 *sp->f_mntonname = '/'; 3553 } else { 3554 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname)); 3555 } 3556} 3557 3558/* 3559 * Check with permission for a specific privilege is granted within jail. We 3560 * have a specific list of accepted privileges; the rest are denied. 3561 */ 3562int 3563prison_priv_check(struct ucred *cred, int priv) 3564{ 3565 3566 if (!jailed(cred)) 3567 return (0); 3568 3569#ifdef VIMAGE 3570 /* 3571 * Privileges specific to prisons with a virtual network stack. 3572 * There might be a duplicate entry here in case the privilege 3573 * is only granted conditionally in the legacy jail case. 3574 */ 3575 switch (priv) { 3576#ifdef notyet 3577 /* 3578 * NFS-specific privileges. 3579 */ 3580 case PRIV_NFS_DAEMON: 3581 case PRIV_NFS_LOCKD: 3582#endif 3583 /* 3584 * Network stack privileges. 3585 */ 3586 case PRIV_NET_BRIDGE: 3587 case PRIV_NET_GRE: 3588 case PRIV_NET_BPF: 3589 case PRIV_NET_RAW: /* Dup, cond. in legacy jail case. */ 3590 case PRIV_NET_ROUTE: 3591 case PRIV_NET_TAP: 3592 case PRIV_NET_SETIFMTU: 3593 case PRIV_NET_SETIFFLAGS: 3594 case PRIV_NET_SETIFCAP: 3595 case PRIV_NET_SETIFDESCR: 3596 case PRIV_NET_SETIFNAME : 3597 case PRIV_NET_SETIFMETRIC: 3598 case PRIV_NET_SETIFPHYS: 3599 case PRIV_NET_SETIFMAC: 3600 case PRIV_NET_ADDMULTI: 3601 case PRIV_NET_DELMULTI: 3602 case PRIV_NET_HWIOCTL: 3603 case PRIV_NET_SETLLADDR: 3604 case PRIV_NET_ADDIFGROUP: 3605 case PRIV_NET_DELIFGROUP: 3606 case PRIV_NET_IFCREATE: 3607 case PRIV_NET_IFDESTROY: 3608 case PRIV_NET_ADDIFADDR: 3609 case PRIV_NET_DELIFADDR: 3610 case PRIV_NET_LAGG: 3611 case PRIV_NET_GIF: 3612 case PRIV_NET_SETIFVNET: 3613 3614 /* 3615 * 802.11-related privileges. 3616 */ 3617 case PRIV_NET80211_GETKEY: 3618#ifdef notyet 3619 case PRIV_NET80211_MANAGE: /* XXX-BZ discuss with sam@ */ 3620#endif 3621 3622#ifdef notyet 3623 /* 3624 * AppleTalk privileges. 3625 */ 3626 case PRIV_NETATALK_RESERVEDPORT: 3627 3628 /* 3629 * ATM privileges. 3630 */ 3631 case PRIV_NETATM_CFG: 3632 case PRIV_NETATM_ADD: 3633 case PRIV_NETATM_DEL: 3634 case PRIV_NETATM_SET: 3635 3636 /* 3637 * Bluetooth privileges. 3638 */ 3639 case PRIV_NETBLUETOOTH_RAW: 3640#endif 3641 3642 /* 3643 * Netgraph and netgraph module privileges. 3644 */ 3645 case PRIV_NETGRAPH_CONTROL: 3646#ifdef notyet 3647 case PRIV_NETGRAPH_TTY: 3648#endif 3649 3650 /* 3651 * IPv4 and IPv6 privileges. 3652 */ 3653 case PRIV_NETINET_IPFW: 3654 case PRIV_NETINET_DIVERT: 3655 case PRIV_NETINET_PF: 3656 case PRIV_NETINET_DUMMYNET: 3657 case PRIV_NETINET_CARP: 3658 case PRIV_NETINET_MROUTE: 3659 case PRIV_NETINET_RAW: 3660 case PRIV_NETINET_ADDRCTRL6: 3661 case PRIV_NETINET_ND6: 3662 case PRIV_NETINET_SCOPE6: 3663 case PRIV_NETINET_ALIFETIME6: 3664 case PRIV_NETINET_IPSEC: 3665 case PRIV_NETINET_BINDANY: 3666 3667#ifdef notyet 3668 /* 3669 * IPX/SPX privileges. 3670 */ 3671 case PRIV_NETIPX_RESERVEDPORT: 3672 case PRIV_NETIPX_RAW: 3673 3674 /* 3675 * NCP privileges. 3676 */ 3677 case PRIV_NETNCP: 3678 3679 /* 3680 * SMB privileges. 3681 */ 3682 case PRIV_NETSMB: 3683#endif 3684 3685 /* 3686 * No default: or deny here. 3687 * In case of no permit fall through to next switch(). 3688 */ 3689 if (cred->cr_prison->pr_flags & PR_VNET) 3690 return (0); 3691 } 3692#endif /* VIMAGE */ 3693 3694 switch (priv) { 3695 3696 /* 3697 * Allow ktrace privileges for root in jail. 3698 */ 3699 case PRIV_KTRACE: 3700 3701#if 0 3702 /* 3703 * Allow jailed processes to configure audit identity and 3704 * submit audit records (login, etc). In the future we may 3705 * want to further refine the relationship between audit and 3706 * jail. 3707 */ 3708 case PRIV_AUDIT_GETAUDIT: 3709 case PRIV_AUDIT_SETAUDIT: 3710 case PRIV_AUDIT_SUBMIT: 3711#endif 3712 3713 /* 3714 * Allow jailed processes to manipulate process UNIX 3715 * credentials in any way they see fit. 3716 */ 3717 case PRIV_CRED_SETUID: 3718 case PRIV_CRED_SETEUID: 3719 case PRIV_CRED_SETGID: 3720 case PRIV_CRED_SETEGID: 3721 case PRIV_CRED_SETGROUPS: 3722 case PRIV_CRED_SETREUID: 3723 case PRIV_CRED_SETREGID: 3724 case PRIV_CRED_SETRESUID: 3725 case PRIV_CRED_SETRESGID: 3726 3727 /* 3728 * Jail implements visibility constraints already, so allow 3729 * jailed root to override uid/gid-based constraints. 3730 */ 3731 case PRIV_SEEOTHERGIDS: 3732 case PRIV_SEEOTHERUIDS: 3733 3734 /* 3735 * Jail implements inter-process debugging limits already, so 3736 * allow jailed root various debugging privileges. 3737 */ 3738 case PRIV_DEBUG_DIFFCRED: 3739 case PRIV_DEBUG_SUGID: 3740 case PRIV_DEBUG_UNPRIV: 3741 3742 /* 3743 * Allow jail to set various resource limits and login 3744 * properties, and for now, exceed process resource limits. 3745 */ 3746 case PRIV_PROC_LIMIT: 3747 case PRIV_PROC_SETLOGIN: 3748 case PRIV_PROC_SETRLIMIT: 3749 3750 /* 3751 * System V and POSIX IPC privileges are granted in jail. 3752 */ 3753 case PRIV_IPC_READ: 3754 case PRIV_IPC_WRITE: 3755 case PRIV_IPC_ADMIN: 3756 case PRIV_IPC_MSGSIZE: 3757 case PRIV_MQ_ADMIN: 3758 3759 /* 3760 * Jail operations within a jail work on child jails. 3761 */ 3762 case PRIV_JAIL_ATTACH: 3763 case PRIV_JAIL_SET: 3764 case PRIV_JAIL_REMOVE: 3765 3766 /* 3767 * Jail implements its own inter-process limits, so allow 3768 * root processes in jail to change scheduling on other 3769 * processes in the same jail. Likewise for signalling. 3770 */ 3771 case PRIV_SCHED_DIFFCRED: 3772 case PRIV_SCHED_CPUSET: 3773 case PRIV_SIGNAL_DIFFCRED: 3774 case PRIV_SIGNAL_SUGID: 3775 3776 /* 3777 * Allow jailed processes to write to sysctls marked as jail 3778 * writable. 3779 */ 3780 case PRIV_SYSCTL_WRITEJAIL: 3781 3782 /* 3783 * Allow root in jail to manage a variety of quota 3784 * properties. These should likely be conditional on a 3785 * configuration option. 3786 */ 3787 case PRIV_VFS_GETQUOTA: 3788 case PRIV_VFS_SETQUOTA: 3789 3790 /* 3791 * Since Jail relies on chroot() to implement file system 3792 * protections, grant many VFS privileges to root in jail. 3793 * Be careful to exclude mount-related and NFS-related 3794 * privileges. 3795 */ 3796 case PRIV_VFS_READ: 3797 case PRIV_VFS_WRITE: 3798 case PRIV_VFS_ADMIN: 3799 case PRIV_VFS_EXEC: 3800 case PRIV_VFS_LOOKUP: 3801 case PRIV_VFS_BLOCKRESERVE: /* XXXRW: Slightly surprising. */ 3802 case PRIV_VFS_CHFLAGS_DEV: 3803 case PRIV_VFS_CHOWN: 3804 case PRIV_VFS_CHROOT: 3805 case PRIV_VFS_RETAINSUGID: 3806 case PRIV_VFS_FCHROOT: 3807 case PRIV_VFS_LINK: 3808 case PRIV_VFS_SETGID: 3809 case PRIV_VFS_STAT: 3810 case PRIV_VFS_STICKYFILE: 3811 return (0); 3812 3813 /* 3814 * Depending on the global setting, allow privilege of 3815 * setting system flags. 3816 */ 3817 case PRIV_VFS_SYSFLAGS: 3818 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS) 3819 return (0); 3820 else 3821 return (EPERM); 3822 3823 /* 3824 * Depending on the global setting, allow privilege of 3825 * mounting/unmounting file systems. 3826 */ 3827 case PRIV_VFS_MOUNT: 3828 case PRIV_VFS_UNMOUNT: 3829 case PRIV_VFS_MOUNT_NONUSER: 3830 case PRIV_VFS_MOUNT_OWNER: 3831 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT) 3832 return (0); 3833 else 3834 return (EPERM); 3835 3836 /* 3837 * Allow jailed root to bind reserved ports and reuse in-use 3838 * ports. 3839 */ 3840 case PRIV_NETINET_RESERVEDPORT: 3841 case PRIV_NETINET_REUSEPORT: 3842 return (0); 3843 3844 /* 3845 * Allow jailed root to set certian IPv4/6 (option) headers. 3846 */ 3847 case PRIV_NETINET_SETHDROPTS: 3848 return (0); 3849 3850 /* 3851 * Conditionally allow creating raw sockets in jail. 3852 */ 3853 case PRIV_NETINET_RAW: 3854 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS) 3855 return (0); 3856 else 3857 return (EPERM); 3858 3859 /* 3860 * Since jail implements its own visibility limits on netstat 3861 * sysctls, allow getcred. This allows identd to work in 3862 * jail. 3863 */ 3864 case PRIV_NETINET_GETCRED: 3865 return (0); 3866 3867 default: 3868 /* 3869 * In all remaining cases, deny the privilege request. This 3870 * includes almost all network privileges, many system 3871 * configuration privileges. 3872 */ 3873 return (EPERM); 3874 } 3875} 3876 3877/* 3878 * Return the part of pr2's name that is relative to pr1, or the whole name 3879 * if it does not directly follow. 3880 */ 3881 3882char * 3883prison_name(struct prison *pr1, struct prison *pr2) 3884{ 3885 char *name; 3886 3887 /* Jails see themselves as "0" (if they see themselves at all). */ 3888 if (pr1 == pr2) 3889 return "0"; 3890 name = pr2->pr_name; 3891 if (prison_ischild(pr1, pr2)) { 3892 /* 3893 * pr1 isn't locked (and allprison_lock may not be either) 3894 * so its length can't be counted on. But the number of dots 3895 * can be counted on - and counted. 3896 */ 3897 for (; pr1 != &prison0; pr1 = pr1->pr_parent) 3898 name = strchr(name, '.') + 1; 3899 } 3900 return (name); 3901} 3902 3903/* 3904 * Return the part of pr2's path that is relative to pr1, or the whole path 3905 * if it does not directly follow. 3906 */ 3907static char * 3908prison_path(struct prison *pr1, struct prison *pr2) 3909{ 3910 char *path1, *path2; 3911 int len1; 3912 3913 path1 = pr1->pr_path; 3914 path2 = pr2->pr_path; 3915 if (!strcmp(path1, "/")) 3916 return (path2); 3917 len1 = strlen(path1); 3918 if (strncmp(path1, path2, len1)) 3919 return (path2); 3920 if (path2[len1] == '\0') 3921 return "/"; 3922 if (path2[len1] == '/') 3923 return (path2 + len1); 3924 return (path2); 3925} 3926 3927 3928/* 3929 * Jail-related sysctls. 3930 */ 3931SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0, 3932 "Jails"); 3933 3934static int 3935sysctl_jail_list(SYSCTL_HANDLER_ARGS) 3936{ 3937 struct xprison *xp; 3938 struct prison *pr, *cpr; 3939#ifdef INET 3940 struct in_addr *ip4 = NULL; 3941 int ip4s = 0; 3942#endif 3943#ifdef INET6 3944 struct in6_addr *ip6 = NULL; 3945 int ip6s = 0; 3946#endif 3947 int descend, error; 3948 3949 xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK); 3950 pr = req->td->td_ucred->cr_prison; 3951 error = 0; 3952 sx_slock(&allprison_lock); 3953 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) { 3954#if defined(INET) || defined(INET6) 3955 again: 3956#endif 3957 mtx_lock(&cpr->pr_mtx); 3958#ifdef INET 3959 if (cpr->pr_ip4s > 0) { 3960 if (ip4s < cpr->pr_ip4s) { 3961 ip4s = cpr->pr_ip4s; 3962 mtx_unlock(&cpr->pr_mtx); 3963 ip4 = realloc(ip4, ip4s * 3964 sizeof(struct in_addr), M_TEMP, M_WAITOK); 3965 goto again; 3966 } 3967 bcopy(cpr->pr_ip4, ip4, 3968 cpr->pr_ip4s * sizeof(struct in_addr)); 3969 } 3970#endif 3971#ifdef INET6 3972 if (cpr->pr_ip6s > 0) { 3973 if (ip6s < cpr->pr_ip6s) { 3974 ip6s = cpr->pr_ip6s; 3975 mtx_unlock(&cpr->pr_mtx); 3976 ip6 = realloc(ip6, ip6s * 3977 sizeof(struct in6_addr), M_TEMP, M_WAITOK); 3978 goto again; 3979 } 3980 bcopy(cpr->pr_ip6, ip6, 3981 cpr->pr_ip6s * sizeof(struct in6_addr)); 3982 } 3983#endif 3984 if (cpr->pr_ref == 0) { 3985 mtx_unlock(&cpr->pr_mtx); 3986 continue; 3987 } 3988 bzero(xp, sizeof(*xp)); 3989 xp->pr_version = XPRISON_VERSION; 3990 xp->pr_id = cpr->pr_id; 3991 xp->pr_state = cpr->pr_uref > 0 3992 ? PRISON_STATE_ALIVE : PRISON_STATE_DYING; 3993 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path)); 3994 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host)); 3995 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name)); 3996#ifdef INET 3997 xp->pr_ip4s = cpr->pr_ip4s; 3998#endif 3999#ifdef INET6 4000 xp->pr_ip6s = cpr->pr_ip6s; 4001#endif 4002 mtx_unlock(&cpr->pr_mtx); 4003 error = SYSCTL_OUT(req, xp, sizeof(*xp)); 4004 if (error) 4005 break; 4006#ifdef INET 4007 if (xp->pr_ip4s > 0) { 4008 error = SYSCTL_OUT(req, ip4, 4009 xp->pr_ip4s * sizeof(struct in_addr)); 4010 if (error) 4011 break; 4012 } 4013#endif 4014#ifdef INET6 4015 if (xp->pr_ip6s > 0) { 4016 error = SYSCTL_OUT(req, ip6, 4017 xp->pr_ip6s * sizeof(struct in6_addr)); 4018 if (error) 4019 break; 4020 } 4021#endif 4022 } 4023 sx_sunlock(&allprison_lock); 4024 free(xp, M_TEMP); 4025#ifdef INET 4026 free(ip4, M_TEMP); 4027#endif 4028#ifdef INET6 4029 free(ip6, M_TEMP); 4030#endif 4031 return (error); 4032} 4033 4034SYSCTL_OID(_security_jail, OID_AUTO, list, 4035 CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4036 sysctl_jail_list, "S", "List of active jails"); 4037 4038static int 4039sysctl_jail_jailed(SYSCTL_HANDLER_ARGS) 4040{ 4041 int error, injail; 4042 4043 injail = jailed(req->td->td_ucred); 4044 error = SYSCTL_OUT(req, &injail, sizeof(injail)); 4045 4046 return (error); 4047} 4048 4049SYSCTL_PROC(_security_jail, OID_AUTO, jailed, 4050 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 4051 sysctl_jail_jailed, "I", "Process in jail?"); 4052 4053#if defined(INET) || defined(INET6) 4054SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW, 4055 &jail_max_af_ips, 0, 4056 "Number of IP addresses a jail may have at most per address family"); 4057#endif 4058 4059/* 4060 * Default parameters for jail(2) compatability. For historical reasons, 4061 * the sysctl names have varying similarity to the parameter names. Prisons 4062 * just see their own parameters, and can't change them. 4063 */ 4064static int 4065sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS) 4066{ 4067 struct prison *pr; 4068 int allow, error, i; 4069 4070 pr = req->td->td_ucred->cr_prison; 4071 allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow; 4072 4073 /* Get the current flag value, and convert it to a boolean. */ 4074 i = (allow & arg2) ? 1 : 0; 4075 if (arg1 != NULL) 4076 i = !i; 4077 error = sysctl_handle_int(oidp, &i, 0, req); 4078 if (error || !req->newptr) 4079 return (error); 4080 i = i ? arg2 : 0; 4081 if (arg1 != NULL) 4082 i ^= arg2; 4083 /* 4084 * The sysctls don't have CTLFLAGS_PRISON, so assume prison0 4085 * for writing. 4086 */ 4087 mtx_lock(&prison0.pr_mtx); 4088 jail_default_allow = (jail_default_allow & ~arg2) | i; 4089 mtx_unlock(&prison0.pr_mtx); 4090 return (0); 4091} 4092 4093SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed, 4094 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4095 NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I", 4096 "Processes in jail can set their hostnames"); 4097SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only, 4098 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4099 (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I", 4100 "Processes in jail are limited to creating UNIX/IP/route sockets only"); 4101SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed, 4102 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4103 NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I", 4104 "Processes in jail can use System V IPC primitives"); 4105SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets, 4106 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4107 NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I", 4108 "Prison root can create raw sockets"); 4109SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed, 4110 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4111 NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I", 4112 "Processes in jail can alter system file flags"); 4113SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed, 4114 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4115 NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I", 4116 "Processes in jail can mount/unmount jail-friendly file systems"); 4117 4118static int 4119sysctl_jail_default_level(SYSCTL_HANDLER_ARGS) 4120{ 4121 struct prison *pr; 4122 int level, error; 4123 4124 pr = req->td->td_ucred->cr_prison; 4125 level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2); 4126 error = sysctl_handle_int(oidp, &level, 0, req); 4127 if (error || !req->newptr) 4128 return (error); 4129 *(int *)arg1 = level; 4130 return (0); 4131} 4132 4133SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs, 4134 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 4135 &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs), 4136 sysctl_jail_default_level, "I", 4137 "Processes in jail cannot see all mounted file systems"); 4138 4139/* 4140 * Nodes to describe jail parameters. Maximum length of string parameters 4141 * is returned in the string itself, and the other parameters exist merely 4142 * to make themselves and their types known. 4143 */ 4144SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0, 4145 "Jail parameters"); 4146 4147int 4148sysctl_jail_param(SYSCTL_HANDLER_ARGS) 4149{ 4150 int i; 4151 long l; 4152 size_t s; 4153 char numbuf[12]; 4154 4155 switch (oidp->oid_kind & CTLTYPE) 4156 { 4157 case CTLTYPE_LONG: 4158 case CTLTYPE_ULONG: 4159 l = 0; 4160#ifdef SCTL_MASK32 4161 if (!(req->flags & SCTL_MASK32)) 4162#endif 4163 return (SYSCTL_OUT(req, &l, sizeof(l))); 4164 case CTLTYPE_INT: 4165 case CTLTYPE_UINT: 4166 i = 0; 4167 return (SYSCTL_OUT(req, &i, sizeof(i))); 4168 case CTLTYPE_STRING: 4169 snprintf(numbuf, sizeof(numbuf), "%d", arg2); 4170 return 4171 (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req)); 4172 case CTLTYPE_STRUCT: 4173 s = (size_t)arg2; 4174 return (SYSCTL_OUT(req, &s, sizeof(s))); 4175 } 4176 return (0); 4177} 4178 4179SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID"); 4180SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID"); 4181SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name"); 4182SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path"); 4183SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW, 4184 "I", "Jail secure level"); 4185SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW, 4186 "I", "Jail cannot see all mounted file systems"); 4187SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW, 4188 "B", "Jail persistence"); 4189#ifdef VIMAGE 4190SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN, 4191 "E,jailsys", "Virtual network stack"); 4192#endif 4193SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD, 4194 "B", "Jail is in the process of shutting down"); 4195 4196SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails"); 4197SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD, 4198 "I", "Current number of child jails"); 4199SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW, 4200 "I", "Maximum number of child jails"); 4201 4202SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info"); 4203SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN, 4204 "Jail hostname"); 4205SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN, 4206 "Jail NIS domainname"); 4207SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN, 4208 "Jail host UUID"); 4209SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW, 4210 "LU", "Jail host ID"); 4211 4212SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset"); 4213SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID"); 4214 4215#ifdef INET 4216SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN, 4217 "Jail IPv4 address virtualization"); 4218SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr), 4219 "S,in_addr,a", "Jail IPv4 addresses"); 4220SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4221 "B", "Do (not) use IPv4 source address selection rather than the " 4222 "primary jail IPv4 address."); 4223#endif 4224#ifdef INET6 4225SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN, 4226 "Jail IPv6 address virtualization"); 4227SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr), 4228 "S,in6_addr,a", "Jail IPv6 addresses"); 4229SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW, 4230 "B", "Do (not) use IPv6 source address selection rather than the " 4231 "primary jail IPv6 address."); 4232#endif 4233 4234SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags"); 4235SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW, 4236 "B", "Jail may set hostname"); 4237SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW, 4238 "B", "Jail may use SYSV IPC"); 4239SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW, 4240 "B", "Jail may create raw sockets"); 4241SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW, 4242 "B", "Jail may alter system file flags"); 4243SYSCTL_JAIL_PARAM(_allow, mount, CTLTYPE_INT | CTLFLAG_RW, 4244 "B", "Jail may mount/unmount jail-friendly file systems"); 4245SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW, 4246 "B", "Jail may set file quotas"); 4247SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW, 4248 "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route"); 4249 4250 4251#ifdef DDB 4252 4253static void 4254db_show_prison(struct prison *pr) 4255{ 4256 int fi; 4257#if defined(INET) || defined(INET6) 4258 int ii; 4259#endif 4260 unsigned jsf; 4261#ifdef INET6 4262 char ip6buf[INET6_ADDRSTRLEN]; 4263#endif 4264 4265 db_printf("prison %p:\n", pr); 4266 db_printf(" jid = %d\n", pr->pr_id); 4267 db_printf(" name = %s\n", pr->pr_name); 4268 db_printf(" parent = %p\n", pr->pr_parent); 4269 db_printf(" ref = %d\n", pr->pr_ref); 4270 db_printf(" uref = %d\n", pr->pr_uref); 4271 db_printf(" path = %s\n", pr->pr_path); 4272 db_printf(" cpuset = %d\n", pr->pr_cpuset 4273 ? pr->pr_cpuset->cs_id : -1); 4274#ifdef VIMAGE 4275 db_printf(" vnet = %p\n", pr->pr_vnet); 4276#endif 4277 db_printf(" root = %p\n", pr->pr_root); 4278 db_printf(" securelevel = %d\n", pr->pr_securelevel); 4279 db_printf(" children.max = %d\n", pr->pr_childmax); 4280 db_printf(" children.cur = %d\n", pr->pr_childcount); 4281 db_printf(" child = %p\n", LIST_FIRST(&pr->pr_children)); 4282 db_printf(" sibling = %p\n", LIST_NEXT(pr, pr_sibling)); 4283 db_printf(" flags = 0x%x", pr->pr_flags); 4284 for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]); 4285 fi++) 4286 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi))) 4287 db_printf(" %s", pr_flag_names[fi]); 4288 for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]); 4289 fi++) { 4290 jsf = pr->pr_flags & 4291 (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new); 4292 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name, 4293 pr_flag_jailsys[fi].disable && 4294 (jsf == pr_flag_jailsys[fi].disable) ? "disable" 4295 : (jsf == pr_flag_jailsys[fi].new) ? "new" 4296 : "inherit"); 4297 } 4298 db_printf(" allow = 0x%x", pr->pr_allow); 4299 for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]); 4300 fi++) 4301 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi))) 4302 db_printf(" %s", pr_allow_names[fi]); 4303 db_printf("\n"); 4304 db_printf(" enforce_statfs = %d\n", pr->pr_enforce_statfs); 4305 db_printf(" host.hostname = %s\n", pr->pr_hostname); 4306 db_printf(" host.domainname = %s\n", pr->pr_domainname); 4307 db_printf(" host.hostuuid = %s\n", pr->pr_hostuuid); 4308 db_printf(" host.hostid = %lu\n", pr->pr_hostid); 4309#ifdef INET 4310 db_printf(" ip4s = %d\n", pr->pr_ip4s); 4311 for (ii = 0; ii < pr->pr_ip4s; ii++) 4312 db_printf(" %s %s\n", 4313 ii == 0 ? "ip4.addr =" : " ", 4314 inet_ntoa(pr->pr_ip4[ii])); 4315#endif 4316#ifdef INET6 4317 db_printf(" ip6s = %d\n", pr->pr_ip6s); 4318 for (ii = 0; ii < pr->pr_ip6s; ii++) 4319 db_printf(" %s %s\n", 4320 ii == 0 ? "ip6.addr =" : " ", 4321 ip6_sprintf(ip6buf, &pr->pr_ip6[ii])); 4322#endif 4323} 4324 4325DB_SHOW_COMMAND(prison, db_show_prison_command) 4326{ 4327 struct prison *pr; 4328 4329 if (!have_addr) { 4330 /* 4331 * Show all prisons in the list, and prison0 which is not 4332 * listed. 4333 */ 4334 db_show_prison(&prison0); 4335 if (!db_pager_quit) { 4336 TAILQ_FOREACH(pr, &allprison, pr_list) { 4337 db_show_prison(pr); 4338 if (db_pager_quit) 4339 break; 4340 } 4341 } 4342 return; 4343 } 4344 4345 if (addr == 0) 4346 pr = &prison0; 4347 else { 4348 /* Look for a prison with the ID and with references. */ 4349 TAILQ_FOREACH(pr, &allprison, pr_list) 4350 if (pr->pr_id == addr && pr->pr_ref > 0) 4351 break; 4352 if (pr == NULL) 4353 /* Look again, without requiring a reference. */ 4354 TAILQ_FOREACH(pr, &allprison, pr_list) 4355 if (pr->pr_id == addr) 4356 break; 4357 if (pr == NULL) 4358 /* Assume address points to a valid prison. */ 4359 pr = (struct prison *)addr; 4360 } 4361 db_show_prison(pr); 4362} 4363 4364#endif /* DDB */ 4365